1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // no precompiled headers
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/systemDictionary.hpp"
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/icBuffer.hpp"
  30 #include "code/vtableStubs.hpp"
  31 #include "compiler/compileBroker.hpp"
  32 #include "compiler/disassembler.hpp"
  33 #include "interpreter/interpreter.hpp"
  34 #include "jvm_solaris.h"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/filemap.hpp"
  37 #include "mutex_solaris.inline.hpp"
  38 #include "oops/oop.inline.hpp"
  39 #include "os_share_solaris.hpp"
  40 #include "prims/jniFastGetField.hpp"
  41 #include "prims/jvm.h"
  42 #include "prims/jvm_misc.hpp"
  43 #include "runtime/arguments.hpp"
  44 #include "runtime/extendedPC.hpp"
  45 #include "runtime/globals.hpp"
  46 #include "runtime/interfaceSupport.hpp"
  47 #include "runtime/java.hpp"
  48 #include "runtime/javaCalls.hpp"
  49 #include "runtime/mutexLocker.hpp"
  50 #include "runtime/objectMonitor.hpp"
  51 #include "runtime/osThread.hpp"
  52 #include "runtime/perfMemory.hpp"
  53 #include "runtime/sharedRuntime.hpp"
  54 #include "runtime/statSampler.hpp"
  55 #include "runtime/stubRoutines.hpp"
  56 #include "runtime/thread.inline.hpp"
  57 #include "runtime/threadCritical.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "services/attachListener.hpp"
  60 #include "services/memTracker.hpp"
  61 #include "services/runtimeService.hpp"
  62 #include "utilities/decoder.hpp"
  63 #include "utilities/defaultStream.hpp"
  64 #include "utilities/events.hpp"
  65 #include "utilities/growableArray.hpp"
  66 #include "utilities/vmError.hpp"
  67 
  68 // put OS-includes here
  69 # include <dlfcn.h>
  70 # include <errno.h>
  71 # include <exception>
  72 # include <link.h>
  73 # include <poll.h>
  74 # include <pthread.h>
  75 # include <pwd.h>
  76 # include <schedctl.h>
  77 # include <setjmp.h>
  78 # include <signal.h>
  79 # include <stdio.h>
  80 # include <alloca.h>
  81 # include <sys/filio.h>
  82 # include <sys/ipc.h>
  83 # include <sys/lwp.h>
  84 # include <sys/machelf.h>     // for elf Sym structure used by dladdr1
  85 # include <sys/mman.h>
  86 # include <sys/processor.h>
  87 # include <sys/procset.h>
  88 # include <sys/pset.h>
  89 # include <sys/resource.h>
  90 # include <sys/shm.h>
  91 # include <sys/socket.h>
  92 # include <sys/stat.h>
  93 # include <sys/systeminfo.h>
  94 # include <sys/time.h>
  95 # include <sys/times.h>
  96 # include <sys/types.h>
  97 # include <sys/wait.h>
  98 # include <sys/utsname.h>
  99 # include <thread.h>
 100 # include <unistd.h>
 101 # include <sys/priocntl.h>
 102 # include <sys/rtpriocntl.h>
 103 # include <sys/tspriocntl.h>
 104 # include <sys/iapriocntl.h>
 105 # include <sys/fxpriocntl.h>
 106 # include <sys/loadavg.h>
 107 # include <string.h>
 108 # include <stdio.h>
 109 
 110 # define _STRUCTURED_PROC 1  //  this gets us the new structured proc interfaces of 5.6 & later
 111 # include <sys/procfs.h>     //  see comment in <sys/procfs.h>
 112 
 113 #define MAX_PATH (2 * K)
 114 
 115 // for timer info max values which include all bits
 116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
 117 
 118 #ifdef _GNU_SOURCE
 119 // See bug #6514594
 120 extern "C" int madvise(caddr_t, size_t, int);
 121 extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg,
 122                        int attr, int mask);
 123 #endif //_GNU_SOURCE
 124 
 125 /*
 126   MPSS Changes Start.
 127   The JVM binary needs to be built and run on pre-Solaris 9
 128   systems, but the constants needed by MPSS are only in Solaris 9
 129   header files.  They are textually replicated here to allow
 130   building on earlier systems.  Once building on Solaris 8 is
 131   no longer a requirement, these #defines can be replaced by ordinary
 132   system .h inclusion.
 133 
 134   In earlier versions of the  JDK and Solaris, we used ISM for large pages.
 135   But ISM requires shared memory to achieve this and thus has many caveats.
 136   MPSS is a fully transparent and is a cleaner way to get large pages.
 137   Although we still require keeping ISM for backward compatiblitiy as well as
 138   giving the opportunity to use large pages on older systems it is
 139   recommended that MPSS be used for Solaris 9 and above.
 140 
 141 */
 142 
 143 #ifndef MC_HAT_ADVISE
 144 
 145 struct memcntl_mha {
 146   uint_t          mha_cmd;        /* command(s) */
 147   uint_t          mha_flags;
 148   size_t          mha_pagesize;
 149 };
 150 #define MC_HAT_ADVISE   7       /* advise hat map size */
 151 #define MHA_MAPSIZE_VA  0x1     /* set preferred page size */
 152 #define MAP_ALIGN       0x200   /* addr specifies alignment */
 153 
 154 #endif
 155 // MPSS Changes End.
 156 
 157 
 158 // Here are some liblgrp types from sys/lgrp_user.h to be able to
 159 // compile on older systems without this header file.
 160 
 161 #ifndef MADV_ACCESS_LWP
 162 # define  MADV_ACCESS_LWP         7       /* next LWP to access heavily */
 163 #endif
 164 #ifndef MADV_ACCESS_MANY
 165 # define  MADV_ACCESS_MANY        8       /* many processes to access heavily */
 166 #endif
 167 
 168 #ifndef LGRP_RSRC_CPU
 169 # define LGRP_RSRC_CPU           0       /* CPU resources */
 170 #endif
 171 #ifndef LGRP_RSRC_MEM
 172 # define LGRP_RSRC_MEM           1       /* memory resources */
 173 #endif
 174 
 175 // Some more macros from sys/mman.h that are not present in Solaris 8.
 176 
 177 #ifndef MAX_MEMINFO_CNT
 178 /*
 179  * info_req request type definitions for meminfo
 180  * request types starting with MEMINFO_V are used for Virtual addresses
 181  * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical
 182  * addresses
 183  */
 184 # define MEMINFO_SHIFT           16
 185 # define MEMINFO_MASK            (0xFF << MEMINFO_SHIFT)
 186 # define MEMINFO_VPHYSICAL       (0x01 << MEMINFO_SHIFT) /* get physical addr */
 187 # define MEMINFO_VLGRP           (0x02 << MEMINFO_SHIFT) /* get lgroup */
 188 # define MEMINFO_VPAGESIZE       (0x03 << MEMINFO_SHIFT) /* size of phys page */
 189 # define MEMINFO_VREPLCNT        (0x04 << MEMINFO_SHIFT) /* no. of replica */
 190 # define MEMINFO_VREPL           (0x05 << MEMINFO_SHIFT) /* physical replica */
 191 # define MEMINFO_VREPL_LGRP      (0x06 << MEMINFO_SHIFT) /* lgrp of replica */
 192 # define MEMINFO_PLGRP           (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */
 193 
 194 /* maximum number of addresses meminfo() can process at a time */
 195 # define MAX_MEMINFO_CNT 256
 196 
 197 /* maximum number of request types */
 198 # define MAX_MEMINFO_REQ 31
 199 #endif
 200 
 201 // see thr_setprio(3T) for the basis of these numbers
 202 #define MinimumPriority 0
 203 #define NormalPriority  64
 204 #define MaximumPriority 127
 205 
 206 // Values for ThreadPriorityPolicy == 1
 207 int prio_policy1[CriticalPriority+1] = {
 208   -99999,  0, 16,  32,  48,  64,
 209           80, 96, 112, 124, 127, 127 };
 210 
 211 // System parameters used internally
 212 static clock_t clock_tics_per_sec = 100;
 213 
 214 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
 215 static bool enabled_extended_FILE_stdio = false;
 216 
 217 // For diagnostics to print a message once. see run_periodic_checks
 218 static bool check_addr0_done = false;
 219 static sigset_t check_signal_done;
 220 static bool check_signals = true;
 221 
 222 address os::Solaris::handler_start;  // start pc of thr_sighndlrinfo
 223 address os::Solaris::handler_end;    // end pc of thr_sighndlrinfo
 224 
 225 address os::Solaris::_main_stack_base = NULL;  // 4352906 workaround
 226 
 227 
 228 // "default" initializers for missing libc APIs
 229 extern "C" {
 230   static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
 231   static int lwp_mutex_destroy(mutex_t *mx)                 { return 0; }
 232 
 233   static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
 234   static int lwp_cond_destroy(cond_t *cv)                   { return 0; }
 235 }
 236 
 237 // "default" initializers for pthread-based synchronization
 238 extern "C" {
 239   static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
 240   static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
 241 }
 242 
 243 // Thread Local Storage
 244 // This is common to all Solaris platforms so it is defined here,
 245 // in this common file.
 246 // The declarations are in the os_cpu threadLS*.hpp files.
 247 //
 248 // Static member initialization for TLS
 249 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
 250 
 251 #ifndef PRODUCT
 252 #define _PCT(n,d)       ((100.0*(double)(n))/(double)(d))
 253 
 254 int ThreadLocalStorage::_tcacheHit = 0;
 255 int ThreadLocalStorage::_tcacheMiss = 0;
 256 
 257 void ThreadLocalStorage::print_statistics() {
 258   int total = _tcacheMiss+_tcacheHit;
 259   tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
 260                 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
 261 }
 262 #undef _PCT
 263 #endif // PRODUCT
 264 
 265 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
 266                                                         int index) {
 267   Thread *thread = get_thread_slow();
 268   if (thread != NULL) {
 269     address sp = os::current_stack_pointer();
 270     guarantee(thread->_stack_base == NULL ||
 271               (sp <= thread->_stack_base &&
 272                  sp >= thread->_stack_base - thread->_stack_size) ||
 273                is_error_reported(),
 274               "sp must be inside of selected thread stack");
 275 
 276     thread->set_self_raw_id(raw_id);  // mark for quick retrieval
 277     _get_thread_cache[ index ] = thread;
 278   }
 279   return thread;
 280 }
 281 
 282 
 283 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
 284 #define NO_CACHED_THREAD ((Thread*)all_zero)
 285 
 286 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
 287 
 288   // Store the new value before updating the cache to prevent a race
 289   // between get_thread_via_cache_slowly() and this store operation.
 290   os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
 291 
 292   // Update thread cache with new thread if setting on thread create,
 293   // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
 294   uintptr_t raw = pd_raw_thread_id();
 295   int ix = pd_cache_index(raw);
 296   _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
 297 }
 298 
 299 void ThreadLocalStorage::pd_init() {
 300   for (int i = 0; i < _pd_cache_size; i++) {
 301     _get_thread_cache[i] = NO_CACHED_THREAD;
 302   }
 303 }
 304 
 305 // Invalidate all the caches (happens to be the same as pd_init).
 306 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
 307 
 308 #undef NO_CACHED_THREAD
 309 
 310 // END Thread Local Storage
 311 
 312 static inline size_t adjust_stack_size(address base, size_t size) {
 313   if ((ssize_t)size < 0) {
 314     // 4759953: Compensate for ridiculous stack size.
 315     size = max_intx;
 316   }
 317   if (size > (size_t)base) {
 318     // 4812466: Make sure size doesn't allow the stack to wrap the address space.
 319     size = (size_t)base;
 320   }
 321   return size;
 322 }
 323 
 324 static inline stack_t get_stack_info() {
 325   stack_t st;
 326   int retval = thr_stksegment(&st);
 327   st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
 328   assert(retval == 0, "incorrect return value from thr_stksegment");
 329   assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
 330   assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
 331   return st;
 332 }
 333 
 334 address os::current_stack_base() {
 335   int r = thr_main() ;
 336   guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
 337   bool is_primordial_thread = r;
 338 
 339   // Workaround 4352906, avoid calls to thr_stksegment by
 340   // thr_main after the first one (it looks like we trash
 341   // some data, causing the value for ss_sp to be incorrect).
 342   if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
 343     stack_t st = get_stack_info();
 344     if (is_primordial_thread) {
 345       // cache initial value of stack base
 346       os::Solaris::_main_stack_base = (address)st.ss_sp;
 347     }
 348     return (address)st.ss_sp;
 349   } else {
 350     guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
 351     return os::Solaris::_main_stack_base;
 352   }
 353 }
 354 
 355 size_t os::current_stack_size() {
 356   size_t size;
 357 
 358   int r = thr_main() ;
 359   guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
 360   if(!r) {
 361     size = get_stack_info().ss_size;
 362   } else {
 363     struct rlimit limits;
 364     getrlimit(RLIMIT_STACK, &limits);
 365     size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
 366   }
 367   // base may not be page aligned
 368   address base = current_stack_base();
 369   address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
 370   return (size_t)(base - bottom);
 371 }
 372 
 373 struct tm* os::localtime_pd(const time_t* clock, struct tm*  res) {
 374   return localtime_r(clock, res);
 375 }
 376 
 377 // interruptible infrastructure
 378 
 379 // setup_interruptible saves the thread state before going into an
 380 // interruptible system call.
 381 // The saved state is used to restore the thread to
 382 // its former state whether or not an interrupt is received.
 383 // Used by classloader os::read
 384 // os::restartable_read calls skip this layer and stay in _thread_in_native
 385 
 386 void os::Solaris::setup_interruptible(JavaThread* thread) {
 387 
 388   JavaThreadState thread_state = thread->thread_state();
 389 
 390   assert(thread_state != _thread_blocked, "Coming from the wrong thread");
 391   assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
 392   OSThread* osthread = thread->osthread();
 393   osthread->set_saved_interrupt_thread_state(thread_state);
 394   thread->frame_anchor()->make_walkable(thread);
 395   ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
 396 }
 397 
 398 // Version of setup_interruptible() for threads that are already in
 399 // _thread_blocked. Used by os_sleep().
 400 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
 401   thread->frame_anchor()->make_walkable(thread);
 402 }
 403 
 404 JavaThread* os::Solaris::setup_interruptible() {
 405   JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
 406   setup_interruptible(thread);
 407   return thread;
 408 }
 409 
 410 void os::Solaris::try_enable_extended_io() {
 411   typedef int (*enable_extended_FILE_stdio_t)(int, int);
 412 
 413   if (!UseExtendedFileIO) {
 414     return;
 415   }
 416 
 417   enable_extended_FILE_stdio_t enabler =
 418     (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
 419                                          "enable_extended_FILE_stdio");
 420   if (enabler) {
 421     enabler(-1, -1);
 422   }
 423 }
 424 
 425 
 426 #ifdef ASSERT
 427 
 428 JavaThread* os::Solaris::setup_interruptible_native() {
 429   JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
 430   JavaThreadState thread_state = thread->thread_state();
 431   assert(thread_state == _thread_in_native, "Assumed thread_in_native");
 432   return thread;
 433 }
 434 
 435 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
 436   JavaThreadState thread_state = thread->thread_state();
 437   assert(thread_state == _thread_in_native, "Assumed thread_in_native");
 438 }
 439 #endif
 440 
 441 // cleanup_interruptible reverses the effects of setup_interruptible
 442 // setup_interruptible_already_blocked() does not need any cleanup.
 443 
 444 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
 445   OSThread* osthread = thread->osthread();
 446 
 447   ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
 448 }
 449 
 450 // I/O interruption related counters called in _INTERRUPTIBLE
 451 
 452 void os::Solaris::bump_interrupted_before_count() {
 453   RuntimeService::record_interrupted_before_count();
 454 }
 455 
 456 void os::Solaris::bump_interrupted_during_count() {
 457   RuntimeService::record_interrupted_during_count();
 458 }
 459 
 460 static int _processors_online = 0;
 461 
 462          jint os::Solaris::_os_thread_limit = 0;
 463 volatile jint os::Solaris::_os_thread_count = 0;
 464 
 465 julong os::available_memory() {
 466   return Solaris::available_memory();
 467 }
 468 
 469 julong os::Solaris::available_memory() {
 470   return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
 471 }
 472 
 473 julong os::Solaris::_physical_memory = 0;
 474 
 475 julong os::physical_memory() {
 476    return Solaris::physical_memory();
 477 }
 478 
 479 static hrtime_t first_hrtime = 0;
 480 static const hrtime_t hrtime_hz = 1000*1000*1000;
 481 const int LOCK_BUSY = 1;
 482 const int LOCK_FREE = 0;
 483 const int LOCK_INVALID = -1;
 484 static volatile hrtime_t max_hrtime = 0;
 485 static volatile int max_hrtime_lock = LOCK_FREE;     // Update counter with LSB as lock-in-progress
 486 
 487 
 488 void os::Solaris::initialize_system_info() {
 489   set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
 490   _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
 491   _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
 492 }
 493 
 494 int os::active_processor_count() {
 495   int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
 496   pid_t pid = getpid();
 497   psetid_t pset = PS_NONE;
 498   // Are we running in a processor set or is there any processor set around?
 499   if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
 500     uint_t pset_cpus;
 501     // Query the number of cpus available to us.
 502     if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
 503       assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
 504       _processors_online = pset_cpus;
 505       return pset_cpus;
 506     }
 507   }
 508   // Otherwise return number of online cpus
 509   return online_cpus;
 510 }
 511 
 512 static bool find_processors_in_pset(psetid_t        pset,
 513                                     processorid_t** id_array,
 514                                     uint_t*         id_length) {
 515   bool result = false;
 516   // Find the number of processors in the processor set.
 517   if (pset_info(pset, NULL, id_length, NULL) == 0) {
 518     // Make up an array to hold their ids.
 519     *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
 520     // Fill in the array with their processor ids.
 521     if (pset_info(pset, NULL, id_length, *id_array) == 0) {
 522       result = true;
 523     }
 524   }
 525   return result;
 526 }
 527 
 528 // Callers of find_processors_online() must tolerate imprecise results --
 529 // the system configuration can change asynchronously because of DR
 530 // or explicit psradm operations.
 531 //
 532 // We also need to take care that the loop (below) terminates as the
 533 // number of processors online can change between the _SC_NPROCESSORS_ONLN
 534 // request and the loop that builds the list of processor ids.   Unfortunately
 535 // there's no reliable way to determine the maximum valid processor id,
 536 // so we use a manifest constant, MAX_PROCESSOR_ID, instead.  See p_online
 537 // man pages, which claim the processor id set is "sparse, but
 538 // not too sparse".  MAX_PROCESSOR_ID is used to ensure that we eventually
 539 // exit the loop.
 540 //
 541 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
 542 // not available on S8.0.
 543 
 544 static bool find_processors_online(processorid_t** id_array,
 545                                    uint*           id_length) {
 546   const processorid_t MAX_PROCESSOR_ID = 100000 ;
 547   // Find the number of processors online.
 548   *id_length = sysconf(_SC_NPROCESSORS_ONLN);
 549   // Make up an array to hold their ids.
 550   *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
 551   // Processors need not be numbered consecutively.
 552   long found = 0;
 553   processorid_t next = 0;
 554   while (found < *id_length && next < MAX_PROCESSOR_ID) {
 555     processor_info_t info;
 556     if (processor_info(next, &info) == 0) {
 557       // NB, PI_NOINTR processors are effectively online ...
 558       if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
 559         (*id_array)[found] = next;
 560         found += 1;
 561       }
 562     }
 563     next += 1;
 564   }
 565   if (found < *id_length) {
 566       // The loop above didn't identify the expected number of processors.
 567       // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
 568       // and re-running the loop, above, but there's no guarantee of progress
 569       // if the system configuration is in flux.  Instead, we just return what
 570       // we've got.  Note that in the worst case find_processors_online() could
 571       // return an empty set.  (As a fall-back in the case of the empty set we
 572       // could just return the ID of the current processor).
 573       *id_length = found ;
 574   }
 575 
 576   return true;
 577 }
 578 
 579 static bool assign_distribution(processorid_t* id_array,
 580                                 uint           id_length,
 581                                 uint*          distribution,
 582                                 uint           distribution_length) {
 583   // We assume we can assign processorid_t's to uint's.
 584   assert(sizeof(processorid_t) == sizeof(uint),
 585          "can't convert processorid_t to uint");
 586   // Quick check to see if we won't succeed.
 587   if (id_length < distribution_length) {
 588     return false;
 589   }
 590   // Assign processor ids to the distribution.
 591   // Try to shuffle processors to distribute work across boards,
 592   // assuming 4 processors per board.
 593   const uint processors_per_board = ProcessDistributionStride;
 594   // Find the maximum processor id.
 595   processorid_t max_id = 0;
 596   for (uint m = 0; m < id_length; m += 1) {
 597     max_id = MAX2(max_id, id_array[m]);
 598   }
 599   // The next id, to limit loops.
 600   const processorid_t limit_id = max_id + 1;
 601   // Make up markers for available processors.
 602   bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
 603   for (uint c = 0; c < limit_id; c += 1) {
 604     available_id[c] = false;
 605   }
 606   for (uint a = 0; a < id_length; a += 1) {
 607     available_id[id_array[a]] = true;
 608   }
 609   // Step by "boards", then by "slot", copying to "assigned".
 610   // NEEDS_CLEANUP: The assignment of processors should be stateful,
 611   //                remembering which processors have been assigned by
 612   //                previous calls, etc., so as to distribute several
 613   //                independent calls of this method.  What we'd like is
 614   //                It would be nice to have an API that let us ask
 615   //                how many processes are bound to a processor,
 616   //                but we don't have that, either.
 617   //                In the short term, "board" is static so that
 618   //                subsequent distributions don't all start at board 0.
 619   static uint board = 0;
 620   uint assigned = 0;
 621   // Until we've found enough processors ....
 622   while (assigned < distribution_length) {
 623     // ... find the next available processor in the board.
 624     for (uint slot = 0; slot < processors_per_board; slot += 1) {
 625       uint try_id = board * processors_per_board + slot;
 626       if ((try_id < limit_id) && (available_id[try_id] == true)) {
 627         distribution[assigned] = try_id;
 628         available_id[try_id] = false;
 629         assigned += 1;
 630         break;
 631       }
 632     }
 633     board += 1;
 634     if (board * processors_per_board + 0 >= limit_id) {
 635       board = 0;
 636     }
 637   }
 638   if (available_id != NULL) {
 639     FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
 640   }
 641   return true;
 642 }
 643 
 644 void os::set_native_thread_name(const char *name) {
 645   // Not yet implemented.
 646   return;
 647 }
 648 
 649 bool os::distribute_processes(uint length, uint* distribution) {
 650   bool result = false;
 651   // Find the processor id's of all the available CPUs.
 652   processorid_t* id_array  = NULL;
 653   uint           id_length = 0;
 654   // There are some races between querying information and using it,
 655   // since processor sets can change dynamically.
 656   psetid_t pset = PS_NONE;
 657   // Are we running in a processor set?
 658   if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
 659     result = find_processors_in_pset(pset, &id_array, &id_length);
 660   } else {
 661     result = find_processors_online(&id_array, &id_length);
 662   }
 663   if (result == true) {
 664     if (id_length >= length) {
 665       result = assign_distribution(id_array, id_length, distribution, length);
 666     } else {
 667       result = false;
 668     }
 669   }
 670   if (id_array != NULL) {
 671     FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
 672   }
 673   return result;
 674 }
 675 
 676 bool os::bind_to_processor(uint processor_id) {
 677   // We assume that a processorid_t can be stored in a uint.
 678   assert(sizeof(uint) == sizeof(processorid_t),
 679          "can't convert uint to processorid_t");
 680   int bind_result =
 681     processor_bind(P_LWPID,                       // bind LWP.
 682                    P_MYID,                        // bind current LWP.
 683                    (processorid_t) processor_id,  // id.
 684                    NULL);                         // don't return old binding.
 685   return (bind_result == 0);
 686 }
 687 
 688 bool os::getenv(const char* name, char* buffer, int len) {
 689   char* val = ::getenv( name );
 690   if ( val == NULL
 691   ||   strlen(val) + 1  >  len ) {
 692     if (len > 0)  buffer[0] = 0; // return a null string
 693     return false;
 694   }
 695   strcpy( buffer, val );
 696   return true;
 697 }
 698 
 699 
 700 // Return true if user is running as root.
 701 
 702 bool os::have_special_privileges() {
 703   static bool init = false;
 704   static bool privileges = false;
 705   if (!init) {
 706     privileges = (getuid() != geteuid()) || (getgid() != getegid());
 707     init = true;
 708   }
 709   return privileges;
 710 }
 711 
 712 
 713 void os::init_system_properties_values() {
 714   char arch[12];
 715   sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
 716 
 717   // The next steps are taken in the product version:
 718   //
 719   // Obtain the JAVA_HOME value from the location of libjvm.so.
 720   // This library should be located at:
 721   // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
 722   //
 723   // If "/jre/lib/" appears at the right place in the path, then we
 724   // assume libjvm.so is installed in a JDK and we use this path.
 725   //
 726   // Otherwise exit with message: "Could not create the Java virtual machine."
 727   //
 728   // The following extra steps are taken in the debugging version:
 729   //
 730   // If "/jre/lib/" does NOT appear at the right place in the path
 731   // instead of exit check for $JAVA_HOME environment variable.
 732   //
 733   // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
 734   // then we append a fake suffix "hotspot/libjvm.so" to this path so
 735   // it looks like libjvm.so is installed there
 736   // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
 737   //
 738   // Otherwise exit.
 739   //
 740   // Important note: if the location of libjvm.so changes this
 741   // code needs to be changed accordingly.
 742 
 743   // The next few definitions allow the code to be verbatim:
 744 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
 745 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal)
 746 #define getenv(n) ::getenv(n)
 747 
 748 #define EXTENSIONS_DIR  "/lib/ext"
 749 #define ENDORSED_DIR    "/lib/endorsed"
 750 #define COMMON_DIR      "/usr/jdk/packages"
 751 
 752   {
 753     /* sysclasspath, java_home, dll_dir */
 754     {
 755         char *home_path;
 756         char *dll_path;
 757         char *pslash;
 758         char buf[MAXPATHLEN];
 759         os::jvm_path(buf, sizeof(buf));
 760 
 761         // Found the full path to libjvm.so.
 762         // Now cut the path to <java_home>/jre if we can.
 763         *(strrchr(buf, '/')) = '\0';  /* get rid of /libjvm.so */
 764         pslash = strrchr(buf, '/');
 765         if (pslash != NULL)
 766             *pslash = '\0';           /* get rid of /{client|server|hotspot} */
 767         dll_path = malloc(strlen(buf) + 1);
 768         if (dll_path == NULL)
 769             return;
 770         strcpy(dll_path, buf);
 771         Arguments::set_dll_dir(dll_path);
 772 
 773         if (pslash != NULL) {
 774             pslash = strrchr(buf, '/');
 775             if (pslash != NULL) {
 776                 *pslash = '\0';       /* get rid of /<arch> */
 777                 pslash = strrchr(buf, '/');
 778                 if (pslash != NULL)
 779                     *pslash = '\0';   /* get rid of /lib */
 780             }
 781         }
 782 
 783         home_path = malloc(strlen(buf) + 1);
 784         if (home_path == NULL)
 785             return;
 786         strcpy(home_path, buf);
 787         Arguments::set_java_home(home_path);
 788 
 789         if (!set_boot_path('/', ':'))
 790             return;
 791     }
 792 
 793     /*
 794      * Where to look for native libraries
 795      */
 796     {
 797       // Use dlinfo() to determine the correct java.library.path.
 798       //
 799       // If we're launched by the Java launcher, and the user
 800       // does not set java.library.path explicitly on the commandline,
 801       // the Java launcher sets LD_LIBRARY_PATH for us and unsets
 802       // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64.  In this case
 803       // dlinfo returns LD_LIBRARY_PATH + crle settings (including
 804       // /usr/lib), which is exactly what we want.
 805       //
 806       // If the user does set java.library.path, it completely
 807       // overwrites this setting, and always has.
 808       //
 809       // If we're not launched by the Java launcher, we may
 810       // get here with any/all of the LD_LIBRARY_PATH[_32|64]
 811       // settings.  Again, dlinfo does exactly what we want.
 812 
 813       Dl_serinfo     _info, *info = &_info;
 814       Dl_serpath     *path;
 815       char*          library_path;
 816       char           *common_path;
 817       int            i;
 818 
 819       // determine search path count and required buffer size
 820       if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
 821         vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
 822       }
 823 
 824       // allocate new buffer and initialize
 825       info = (Dl_serinfo*)malloc(_info.dls_size);
 826       if (info == NULL) {
 827         vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR,
 828                               "init_system_properties_values info");
 829       }
 830       info->dls_size = _info.dls_size;
 831       info->dls_cnt = _info.dls_cnt;
 832 
 833       // obtain search path information
 834       if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
 835         free(info);
 836         vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
 837       }
 838 
 839       path = &info->dls_serpath[0];
 840 
 841       // Note: Due to a legacy implementation, most of the library path
 842       // is set in the launcher.  This was to accomodate linking restrictions
 843       // on legacy Solaris implementations (which are no longer supported).
 844       // Eventually, all the library path setting will be done here.
 845       //
 846       // However, to prevent the proliferation of improperly built native
 847       // libraries, the new path component /usr/jdk/packages is added here.
 848 
 849       // Determine the actual CPU architecture.
 850       char cpu_arch[12];
 851       sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
 852 #ifdef _LP64
 853       // If we are a 64-bit vm, perform the following translations:
 854       //   sparc   -> sparcv9
 855       //   i386    -> amd64
 856       if (strcmp(cpu_arch, "sparc") == 0)
 857         strcat(cpu_arch, "v9");
 858       else if (strcmp(cpu_arch, "i386") == 0)
 859         strcpy(cpu_arch, "amd64");
 860 #endif
 861 
 862       // Construct the invariant part of ld_library_path. Note that the
 863       // space for the colon and the trailing null are provided by the
 864       // nulls included by the sizeof operator.
 865       size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
 866       common_path = malloc(bufsize);
 867       if (common_path == NULL) {
 868         free(info);
 869         vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
 870                               "init_system_properties_values common_path");
 871       }
 872       sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
 873 
 874       // struct size is more than sufficient for the path components obtained
 875       // through the dlinfo() call, so only add additional space for the path
 876       // components explicitly added here.
 877       bufsize = info->dls_size + strlen(common_path);
 878       library_path = malloc(bufsize);
 879       if (library_path == NULL) {
 880         free(info);
 881         free(common_path);
 882         vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
 883                               "init_system_properties_values library_path");
 884       }
 885       library_path[0] = '\0';
 886 
 887       // Construct the desired Java library path from the linker's library
 888       // search path.
 889       //
 890       // For compatibility, it is optimal that we insert the additional path
 891       // components specific to the Java VM after those components specified
 892       // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
 893       // infrastructure.
 894       if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
 895         strcpy(library_path, common_path);
 896       } else {
 897         int inserted = 0;
 898         for (i = 0; i < info->dls_cnt; i++, path++) {
 899           uint_t flags = path->dls_flags & LA_SER_MASK;
 900           if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
 901             strcat(library_path, common_path);
 902             strcat(library_path, os::path_separator());
 903             inserted = 1;
 904           }
 905           strcat(library_path, path->dls_name);
 906           strcat(library_path, os::path_separator());
 907         }
 908         // eliminate trailing path separator
 909         library_path[strlen(library_path)-1] = '\0';
 910       }
 911 
 912       // happens before argument parsing - can't use a trace flag
 913       // tty->print_raw("init_system_properties_values: native lib path: ");
 914       // tty->print_raw_cr(library_path);
 915 
 916       // callee copies into its own buffer
 917       Arguments::set_library_path(library_path);
 918 
 919       free(common_path);
 920       free(library_path);
 921       free(info);
 922     }
 923 
 924     /*
 925      * Extensions directories.
 926      *
 927      * Note that the space for the colon and the trailing null are provided
 928      * by the nulls included by the sizeof operator (so actually one byte more
 929      * than necessary is allocated).
 930      */
 931     {
 932         char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
 933             sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
 934             sizeof(EXTENSIONS_DIR));
 935         sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
 936             Arguments::get_java_home());
 937         Arguments::set_ext_dirs(buf);
 938     }
 939 
 940     /* Endorsed standards default directory. */
 941     {
 942         char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
 943         sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
 944         Arguments::set_endorsed_dirs(buf);
 945     }
 946   }
 947 
 948 #undef malloc
 949 #undef free
 950 #undef getenv
 951 #undef EXTENSIONS_DIR
 952 #undef ENDORSED_DIR
 953 #undef COMMON_DIR
 954 
 955 }
 956 
 957 void os::breakpoint() {
 958   BREAKPOINT;
 959 }
 960 
 961 bool os::obsolete_option(const JavaVMOption *option)
 962 {
 963   if (!strncmp(option->optionString, "-Xt", 3)) {
 964     return true;
 965   } else if (!strncmp(option->optionString, "-Xtm", 4)) {
 966     return true;
 967   } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
 968     return true;
 969   } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
 970     return true;
 971   }
 972   return false;
 973 }
 974 
 975 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
 976   address  stackStart  = (address)thread->stack_base();
 977   address  stackEnd    = (address)(stackStart - (address)thread->stack_size());
 978   if (sp < stackStart && sp >= stackEnd ) return true;
 979   return false;
 980 }
 981 
 982 extern "C" void breakpoint() {
 983   // use debugger to set breakpoint here
 984 }
 985 
 986 static thread_t main_thread;
 987 
 988 // Thread start routine for all new Java threads
 989 extern "C" void* java_start(void* thread_addr) {
 990   // Try to randomize the cache line index of hot stack frames.
 991   // This helps when threads of the same stack traces evict each other's
 992   // cache lines. The threads can be either from the same JVM instance, or
 993   // from different JVM instances. The benefit is especially true for
 994   // processors with hyperthreading technology.
 995   static int counter = 0;
 996   int pid = os::current_process_id();
 997   alloca(((pid ^ counter++) & 7) * 128);
 998 
 999   int prio;
1000   Thread* thread = (Thread*)thread_addr;
1001   OSThread* osthr = thread->osthread();
1002 
1003   osthr->set_lwp_id( _lwp_self() );  // Store lwp in case we are bound
1004   thread->_schedctl = (void *) schedctl_init () ;
1005 
1006   if (UseNUMA) {
1007     int lgrp_id = os::numa_get_group_id();
1008     if (lgrp_id != -1) {
1009       thread->set_lgrp_id(lgrp_id);
1010     }
1011   }
1012 
1013   // If the creator called set priority before we started,
1014   // we need to call set_native_priority now that we have an lwp.
1015   // We used to get the priority from thr_getprio (we called
1016   // thr_setprio way back in create_thread) and pass it to
1017   // set_native_priority, but Solaris scales the priority
1018   // in java_to_os_priority, so when we read it back here,
1019   // we pass trash to set_native_priority instead of what's
1020   // in java_to_os_priority. So we save the native priority
1021   // in the osThread and recall it here.
1022 
1023   if ( osthr->thread_id() != -1 ) {
1024     if ( UseThreadPriorities ) {
1025       int prio = osthr->native_priority();
1026       if (ThreadPriorityVerbose) {
1027         tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
1028                       INTPTR_FORMAT ", setting priority: %d\n",
1029                       osthr->thread_id(), osthr->lwp_id(), prio);
1030       }
1031       os::set_native_priority(thread, prio);
1032     }
1033   } else if (ThreadPriorityVerbose) {
1034     warning("Can't set priority in _start routine, thread id hasn't been set\n");
1035   }
1036 
1037   assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1038 
1039   // initialize signal mask for this thread
1040   os::Solaris::hotspot_sigmask(thread);
1041 
1042   thread->run();
1043 
1044   // One less thread is executing
1045   // When the VMThread gets here, the main thread may have already exited
1046   // which frees the CodeHeap containing the Atomic::dec code
1047   if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1048     Atomic::dec(&os::Solaris::_os_thread_count);
1049   }
1050 
1051   if (UseDetachedThreads) {
1052     thr_exit(NULL);
1053     ShouldNotReachHere();
1054   }
1055   return NULL;
1056 }
1057 
1058 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1059   // Allocate the OSThread object
1060   OSThread* osthread = new OSThread(NULL, NULL);
1061   if (osthread == NULL) return NULL;
1062 
1063   // Store info on the Solaris thread into the OSThread
1064   osthread->set_thread_id(thread_id);
1065   osthread->set_lwp_id(_lwp_self());
1066   thread->_schedctl = (void *) schedctl_init () ;
1067 
1068   if (UseNUMA) {
1069     int lgrp_id = os::numa_get_group_id();
1070     if (lgrp_id != -1) {
1071       thread->set_lgrp_id(lgrp_id);
1072     }
1073   }
1074 
1075   if ( ThreadPriorityVerbose ) {
1076     tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1077                   osthread->thread_id(), osthread->lwp_id() );
1078   }
1079 
1080   // Initial thread state is INITIALIZED, not SUSPENDED
1081   osthread->set_state(INITIALIZED);
1082 
1083   return osthread;
1084 }
1085 
1086 void os::Solaris::hotspot_sigmask(Thread* thread) {
1087 
1088   //Save caller's signal mask
1089   sigset_t sigmask;
1090   thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1091   OSThread *osthread = thread->osthread();
1092   osthread->set_caller_sigmask(sigmask);
1093 
1094   thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1095   if (!ReduceSignalUsage) {
1096     if (thread->is_VM_thread()) {
1097       // Only the VM thread handles BREAK_SIGNAL ...
1098       thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1099     } else {
1100       // ... all other threads block BREAK_SIGNAL
1101       assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1102       thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1103     }
1104   }
1105 }
1106 
1107 bool os::create_attached_thread(JavaThread* thread) {
1108 #ifdef ASSERT
1109   thread->verify_not_published();
1110 #endif
1111   OSThread* osthread = create_os_thread(thread, thr_self());
1112   if (osthread == NULL) {
1113      return false;
1114   }
1115 
1116   // Initial thread state is RUNNABLE
1117   osthread->set_state(RUNNABLE);
1118   thread->set_osthread(osthread);
1119 
1120   // initialize signal mask for this thread
1121   // and save the caller's signal mask
1122   os::Solaris::hotspot_sigmask(thread);
1123 
1124   return true;
1125 }
1126 
1127 bool os::create_main_thread(JavaThread* thread) {
1128 #ifdef ASSERT
1129   thread->verify_not_published();
1130 #endif
1131   if (_starting_thread == NULL) {
1132     _starting_thread = create_os_thread(thread, main_thread);
1133      if (_starting_thread == NULL) {
1134         return false;
1135      }
1136   }
1137 
1138   // The primodial thread is runnable from the start
1139   _starting_thread->set_state(RUNNABLE);
1140 
1141   thread->set_osthread(_starting_thread);
1142 
1143   // initialize signal mask for this thread
1144   // and save the caller's signal mask
1145   os::Solaris::hotspot_sigmask(thread);
1146 
1147   return true;
1148 }
1149 
1150 // _T2_libthread is true if we believe we are running with the newer
1151 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1152 bool os::Solaris::_T2_libthread = false;
1153 
1154 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1155   // Allocate the OSThread object
1156   OSThread* osthread = new OSThread(NULL, NULL);
1157   if (osthread == NULL) {
1158     return false;
1159   }
1160 
1161   if ( ThreadPriorityVerbose ) {
1162     char *thrtyp;
1163     switch ( thr_type ) {
1164       case vm_thread:
1165         thrtyp = (char *)"vm";
1166         break;
1167       case cgc_thread:
1168         thrtyp = (char *)"cgc";
1169         break;
1170       case pgc_thread:
1171         thrtyp = (char *)"pgc";
1172         break;
1173       case java_thread:
1174         thrtyp = (char *)"java";
1175         break;
1176       case compiler_thread:
1177         thrtyp = (char *)"compiler";
1178         break;
1179       case watcher_thread:
1180         thrtyp = (char *)"watcher";
1181         break;
1182       default:
1183         thrtyp = (char *)"unknown";
1184         break;
1185     }
1186     tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1187   }
1188 
1189   // Calculate stack size if it's not specified by caller.
1190   if (stack_size == 0) {
1191     // The default stack size 1M (2M for LP64).
1192     stack_size = (BytesPerWord >> 2) * K * K;
1193 
1194     switch (thr_type) {
1195     case os::java_thread:
1196       // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1197       if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1198       break;
1199     case os::compiler_thread:
1200       if (CompilerThreadStackSize > 0) {
1201         stack_size = (size_t)(CompilerThreadStackSize * K);
1202         break;
1203       } // else fall through:
1204         // use VMThreadStackSize if CompilerThreadStackSize is not defined
1205     case os::vm_thread:
1206     case os::pgc_thread:
1207     case os::cgc_thread:
1208     case os::watcher_thread:
1209       if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1210       break;
1211     }
1212   }
1213   stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1214 
1215   // Initial state is ALLOCATED but not INITIALIZED
1216   osthread->set_state(ALLOCATED);
1217 
1218   if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1219     // We got lots of threads. Check if we still have some address space left.
1220     // Need to be at least 5Mb of unreserved address space. We do check by
1221     // trying to reserve some.
1222     const size_t VirtualMemoryBangSize = 20*K*K;
1223     char* mem = os::reserve_memory(VirtualMemoryBangSize);
1224     if (mem == NULL) {
1225       delete osthread;
1226       return false;
1227     } else {
1228       // Release the memory again
1229       os::release_memory(mem, VirtualMemoryBangSize);
1230     }
1231   }
1232 
1233   // Setup osthread because the child thread may need it.
1234   thread->set_osthread(osthread);
1235 
1236   // Create the Solaris thread
1237   // explicit THR_BOUND for T2_libthread case in case
1238   // that assumption is not accurate, but our alternate signal stack
1239   // handling is based on it which must have bound threads
1240   thread_t tid = 0;
1241   long     flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1242                    | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1243                        (thr_type == vm_thread) ||
1244                        (thr_type == cgc_thread) ||
1245                        (thr_type == pgc_thread) ||
1246                        (thr_type == compiler_thread && BackgroundCompilation)) ?
1247                       THR_BOUND : 0);
1248   int      status;
1249 
1250   // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1251   //
1252   // On multiprocessors systems, libthread sometimes under-provisions our
1253   // process with LWPs.  On a 30-way systems, for instance, we could have
1254   // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1255   // to our process.  This can result in under utilization of PEs.
1256   // I suspect the problem is related to libthread's LWP
1257   // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1258   // upcall policy.
1259   //
1260   // The following code is palliative -- it attempts to ensure that our
1261   // process has sufficient LWPs to take advantage of multiple PEs.
1262   // Proper long-term cures include using user-level threads bound to LWPs
1263   // (THR_BOUND) or using LWP-based synchronization.  Note that there is a
1264   // slight timing window with respect to sampling _os_thread_count, but
1265   // the race is benign.  Also, we should periodically recompute
1266   // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1267   // the number of PEs in our partition.  You might be tempted to use
1268   // THR_NEW_LWP here, but I'd recommend against it as that could
1269   // result in undesirable growth of the libthread's LWP pool.
1270   // The fix below isn't sufficient; for instance, it doesn't take into count
1271   // LWPs parked on IO.  It does, however, help certain CPU-bound benchmarks.
1272   //
1273   // Some pathologies this scheme doesn't handle:
1274   // *  Threads can block, releasing the LWPs.  The LWPs can age out.
1275   //    When a large number of threads become ready again there aren't
1276   //    enough LWPs available to service them.  This can occur when the
1277   //    number of ready threads oscillates.
1278   // *  LWPs/Threads park on IO, thus taking the LWP out of circulation.
1279   //
1280   // Finally, we should call thr_setconcurrency() periodically to refresh
1281   // the LWP pool and thwart the LWP age-out mechanism.
1282   // The "+3" term provides a little slop -- we want to slightly overprovision.
1283 
1284   if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1285     if (!(flags & THR_BOUND)) {
1286       thr_setconcurrency (os::Solaris::_os_thread_count);       // avoid starvation
1287     }
1288   }
1289   // Although this doesn't hurt, we should warn of undefined behavior
1290   // when using unbound T1 threads with schedctl().  This should never
1291   // happen, as the compiler and VM threads are always created bound
1292   DEBUG_ONLY(
1293       if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1294           (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1295           ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1296            (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1297          warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1298       }
1299   );
1300 
1301 
1302   // Mark that we don't have an lwp or thread id yet.
1303   // In case we attempt to set the priority before the thread starts.
1304   osthread->set_lwp_id(-1);
1305   osthread->set_thread_id(-1);
1306 
1307   status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1308   if (status != 0) {
1309     if (PrintMiscellaneous && (Verbose || WizardMode)) {
1310       perror("os::create_thread");
1311     }
1312     thread->set_osthread(NULL);
1313     // Need to clean up stuff we've allocated so far
1314     delete osthread;
1315     return false;
1316   }
1317 
1318   Atomic::inc(&os::Solaris::_os_thread_count);
1319 
1320   // Store info on the Solaris thread into the OSThread
1321   osthread->set_thread_id(tid);
1322 
1323   // Remember that we created this thread so we can set priority on it
1324   osthread->set_vm_created();
1325 
1326   // Set the default thread priority.  If using bound threads, setting
1327   // lwp priority will be delayed until thread start.
1328   set_native_priority(thread,
1329                       DefaultThreadPriority == -1 ?
1330                         java_to_os_priority[NormPriority] :
1331                         DefaultThreadPriority);
1332 
1333   // Initial thread state is INITIALIZED, not SUSPENDED
1334   osthread->set_state(INITIALIZED);
1335 
1336   // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1337   return true;
1338 }
1339 
1340 /* defined for >= Solaris 10. This allows builds on earlier versions
1341  *  of Solaris to take advantage of the newly reserved Solaris JVM signals
1342  *  With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1343  *  and -XX:+UseAltSigs does nothing since these should have no conflict
1344  */
1345 #if !defined(SIGJVM1)
1346 #define SIGJVM1 39
1347 #define SIGJVM2 40
1348 #endif
1349 
1350 debug_only(static bool signal_sets_initialized = false);
1351 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1352 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1353 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1354 
1355 bool os::Solaris::is_sig_ignored(int sig) {
1356       struct sigaction oact;
1357       sigaction(sig, (struct sigaction*)NULL, &oact);
1358       void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*,  oact.sa_sigaction)
1359                                      : CAST_FROM_FN_PTR(void*,  oact.sa_handler);
1360       if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1361            return true;
1362       else
1363            return false;
1364 }
1365 
1366 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1367 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1368 static bool isJVM1available() {
1369   return SIGJVM1 < SIGRTMIN;
1370 }
1371 
1372 void os::Solaris::signal_sets_init() {
1373   // Should also have an assertion stating we are still single-threaded.
1374   assert(!signal_sets_initialized, "Already initialized");
1375   // Fill in signals that are necessarily unblocked for all threads in
1376   // the VM. Currently, we unblock the following signals:
1377   // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1378   //                         by -Xrs (=ReduceSignalUsage));
1379   // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1380   // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1381   // the dispositions or masks wrt these signals.
1382   // Programs embedding the VM that want to use the above signals for their
1383   // own purposes must, at this time, use the "-Xrs" option to prevent
1384   // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1385   // (See bug 4345157, and other related bugs).
1386   // In reality, though, unblocking these signals is really a nop, since
1387   // these signals are not blocked by default.
1388   sigemptyset(&unblocked_sigs);
1389   sigemptyset(&allowdebug_blocked_sigs);
1390   sigaddset(&unblocked_sigs, SIGILL);
1391   sigaddset(&unblocked_sigs, SIGSEGV);
1392   sigaddset(&unblocked_sigs, SIGBUS);
1393   sigaddset(&unblocked_sigs, SIGFPE);
1394 
1395   if (isJVM1available) {
1396     os::Solaris::set_SIGinterrupt(SIGJVM1);
1397     os::Solaris::set_SIGasync(SIGJVM2);
1398   } else if (UseAltSigs) {
1399     os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1400     os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1401   } else {
1402     os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1403     os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1404   }
1405 
1406   sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1407   sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1408 
1409   if (!ReduceSignalUsage) {
1410    if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1411       sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1412       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1413    }
1414    if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1415       sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1416       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1417    }
1418    if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1419       sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1420       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1421    }
1422   }
1423   // Fill in signals that are blocked by all but the VM thread.
1424   sigemptyset(&vm_sigs);
1425   if (!ReduceSignalUsage)
1426     sigaddset(&vm_sigs, BREAK_SIGNAL);
1427   debug_only(signal_sets_initialized = true);
1428 
1429   // For diagnostics only used in run_periodic_checks
1430   sigemptyset(&check_signal_done);
1431 }
1432 
1433 // These are signals that are unblocked while a thread is running Java.
1434 // (For some reason, they get blocked by default.)
1435 sigset_t* os::Solaris::unblocked_signals() {
1436   assert(signal_sets_initialized, "Not initialized");
1437   return &unblocked_sigs;
1438 }
1439 
1440 // These are the signals that are blocked while a (non-VM) thread is
1441 // running Java. Only the VM thread handles these signals.
1442 sigset_t* os::Solaris::vm_signals() {
1443   assert(signal_sets_initialized, "Not initialized");
1444   return &vm_sigs;
1445 }
1446 
1447 // These are signals that are blocked during cond_wait to allow debugger in
1448 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1449   assert(signal_sets_initialized, "Not initialized");
1450   return &allowdebug_blocked_sigs;
1451 }
1452 
1453 
1454 void _handle_uncaught_cxx_exception() {
1455   VMError err("An uncaught C++ exception");
1456   err.report_and_die();
1457 }
1458 
1459 
1460 // First crack at OS-specific initialization, from inside the new thread.
1461 void os::initialize_thread(Thread* thr) {
1462   int r = thr_main() ;
1463   guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1464   if (r) {
1465     JavaThread* jt = (JavaThread *)thr;
1466     assert(jt != NULL,"Sanity check");
1467     size_t stack_size;
1468     address base = jt->stack_base();
1469     if (Arguments::created_by_java_launcher()) {
1470       // Use 2MB to allow for Solaris 7 64 bit mode.
1471       stack_size = JavaThread::stack_size_at_create() == 0
1472         ? 2048*K : JavaThread::stack_size_at_create();
1473 
1474       // There are rare cases when we may have already used more than
1475       // the basic stack size allotment before this method is invoked.
1476       // Attempt to allow for a normally sized java_stack.
1477       size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1478       stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1479     } else {
1480       // 6269555: If we were not created by a Java launcher, i.e. if we are
1481       // running embedded in a native application, treat the primordial thread
1482       // as much like a native attached thread as possible.  This means using
1483       // the current stack size from thr_stksegment(), unless it is too large
1484       // to reliably setup guard pages.  A reasonable max size is 8MB.
1485       size_t current_size = current_stack_size();
1486       // This should never happen, but just in case....
1487       if (current_size == 0) current_size = 2 * K * K;
1488       stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1489     }
1490     address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1491     stack_size = (size_t)(base - bottom);
1492 
1493     assert(stack_size > 0, "Stack size calculation problem");
1494 
1495     if (stack_size > jt->stack_size()) {
1496       NOT_PRODUCT(
1497         struct rlimit limits;
1498         getrlimit(RLIMIT_STACK, &limits);
1499         size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1500         assert(size >= jt->stack_size(), "Stack size problem in main thread");
1501       )
1502       tty->print_cr(
1503         "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1504         "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1505         "See limit(1) to increase the stack size limit.",
1506         stack_size / K, jt->stack_size() / K);
1507       vm_exit(1);
1508     }
1509     assert(jt->stack_size() >= stack_size,
1510           "Attempt to map more stack than was allocated");
1511     jt->set_stack_size(stack_size);
1512   }
1513 
1514    // 5/22/01: Right now alternate signal stacks do not handle
1515    // throwing stack overflow exceptions, see bug 4463178
1516    // Until a fix is found for this, T2 will NOT imply alternate signal
1517    // stacks.
1518    // If using T2 libthread threads, install an alternate signal stack.
1519    // Because alternate stacks associate with LWPs on Solaris,
1520    // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1521    // we prefer to explicitly stack bang.
1522    // If not using T2 libthread, but using UseBoundThreads any threads
1523    // (primordial thread, jni_attachCurrentThread) we do not create,
1524    // probably are not bound, therefore they can not have an alternate
1525    // signal stack. Since our stack banging code is generated and
1526    // is shared across threads, all threads must be bound to allow
1527    // using alternate signal stacks.  The alternative is to interpose
1528    // on _lwp_create to associate an alt sig stack with each LWP,
1529    // and this could be a problem when the JVM is embedded.
1530    // We would prefer to use alternate signal stacks with T2
1531    // Since there is currently no accurate way to detect T2
1532    // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1533    // on installing alternate signal stacks
1534 
1535 
1536    // 05/09/03: removed alternate signal stack support for Solaris
1537    // The alternate signal stack mechanism is no longer needed to
1538    // handle stack overflow. This is now handled by allocating
1539    // guard pages (red zone) and stackbanging.
1540    // Initially the alternate signal stack mechanism was removed because
1541    // it did not work with T1 llibthread. Alternate
1542    // signal stacks MUST have all threads bound to lwps. Applications
1543    // can create their own threads and attach them without their being
1544    // bound under T1. This is frequently the case for the primordial thread.
1545    // If we were ever to reenable this mechanism we would need to
1546    // use the dynamic check for T2 libthread.
1547 
1548   os::Solaris::init_thread_fpu_state();
1549   std::set_terminate(_handle_uncaught_cxx_exception);
1550 }
1551 
1552 
1553 
1554 // Free Solaris resources related to the OSThread
1555 void os::free_thread(OSThread* osthread) {
1556   assert(osthread != NULL, "os::free_thread but osthread not set");
1557 
1558 
1559   // We are told to free resources of the argument thread,
1560   // but we can only really operate on the current thread.
1561   // The main thread must take the VMThread down synchronously
1562   // before the main thread exits and frees up CodeHeap
1563   guarantee((Thread::current()->osthread() == osthread
1564      || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1565   if (Thread::current()->osthread() == osthread) {
1566     // Restore caller's signal mask
1567     sigset_t sigmask = osthread->caller_sigmask();
1568     thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1569   }
1570   delete osthread;
1571 }
1572 
1573 void os::pd_start_thread(Thread* thread) {
1574   int status = thr_continue(thread->osthread()->thread_id());
1575   assert_status(status == 0, status, "thr_continue failed");
1576 }
1577 
1578 
1579 intx os::current_thread_id() {
1580   return (intx)thr_self();
1581 }
1582 
1583 static pid_t _initial_pid = 0;
1584 
1585 int os::current_process_id() {
1586   return (int)(_initial_pid ? _initial_pid : getpid());
1587 }
1588 
1589 int os::allocate_thread_local_storage() {
1590   // %%%       in Win32 this allocates a memory segment pointed to by a
1591   //           register.  Dan Stein can implement a similar feature in
1592   //           Solaris.  Alternatively, the VM can do the same thing
1593   //           explicitly: malloc some storage and keep the pointer in a
1594   //           register (which is part of the thread's context) (or keep it
1595   //           in TLS).
1596   // %%%       In current versions of Solaris, thr_self and TSD can
1597   //           be accessed via short sequences of displaced indirections.
1598   //           The value of thr_self is available as %g7(36).
1599   //           The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1600   //           assuming that the current thread already has a value bound to k.
1601   //           It may be worth experimenting with such access patterns,
1602   //           and later having the parameters formally exported from a Solaris
1603   //           interface.  I think, however, that it will be faster to
1604   //           maintain the invariant that %g2 always contains the
1605   //           JavaThread in Java code, and have stubs simply
1606   //           treat %g2 as a caller-save register, preserving it in a %lN.
1607   thread_key_t tk;
1608   if (thr_keycreate( &tk, NULL ) )
1609     fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1610                   "(%s)", strerror(errno)));
1611   return int(tk);
1612 }
1613 
1614 void os::free_thread_local_storage(int index) {
1615   // %%% don't think we need anything here
1616   // if ( pthread_key_delete((pthread_key_t) tk) )
1617   //   fatal("os::free_thread_local_storage: pthread_key_delete failed");
1618 }
1619 
1620 #define SMALLINT 32   // libthread allocate for tsd_common is a version specific
1621                       // small number - point is NO swap space available
1622 void os::thread_local_storage_at_put(int index, void* value) {
1623   // %%% this is used only in threadLocalStorage.cpp
1624   if (thr_setspecific((thread_key_t)index, value)) {
1625     if (errno == ENOMEM) {
1626        vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1627                              "thr_setspecific: out of swap space");
1628     } else {
1629       fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1630                     "(%s)", strerror(errno)));
1631     }
1632   } else {
1633       ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1634   }
1635 }
1636 
1637 // This function could be called before TLS is initialized, for example, when
1638 // VM receives an async signal or when VM causes a fatal error during
1639 // initialization. Return NULL if thr_getspecific() fails.
1640 void* os::thread_local_storage_at(int index) {
1641   // %%% this is used only in threadLocalStorage.cpp
1642   void* r = NULL;
1643   return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1644 }
1645 
1646 
1647 // gethrtime can move backwards if read from one cpu and then a different cpu
1648 // getTimeNanos is guaranteed to not move backward on Solaris
1649 // local spinloop created as faster for a CAS on an int than
1650 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1651 // supported on sparc v8 or pre supports_cx8 intel boxes.
1652 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1653 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1654 inline hrtime_t oldgetTimeNanos() {
1655   int gotlock = LOCK_INVALID;
1656   hrtime_t newtime = gethrtime();
1657 
1658   for (;;) {
1659 // grab lock for max_hrtime
1660     int curlock = max_hrtime_lock;
1661     if (curlock & LOCK_BUSY)  continue;
1662     if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1663     if (newtime > max_hrtime) {
1664       max_hrtime = newtime;
1665     } else {
1666       newtime = max_hrtime;
1667     }
1668     // release lock
1669     max_hrtime_lock = LOCK_FREE;
1670     return newtime;
1671   }
1672 }
1673 // gethrtime can move backwards if read from one cpu and then a different cpu
1674 // getTimeNanos is guaranteed to not move backward on Solaris
1675 inline hrtime_t getTimeNanos() {
1676   if (VM_Version::supports_cx8()) {
1677     const hrtime_t now = gethrtime();
1678     // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1679     const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1680     if (now <= prev)  return prev;   // same or retrograde time;
1681     const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1682     assert(obsv >= prev, "invariant");   // Monotonicity
1683     // If the CAS succeeded then we're done and return "now".
1684     // If the CAS failed and the observed value "obs" is >= now then
1685     // we should return "obs".  If the CAS failed and now > obs > prv then
1686     // some other thread raced this thread and installed a new value, in which case
1687     // we could either (a) retry the entire operation, (b) retry trying to install now
1688     // or (c) just return obs.  We use (c).   No loop is required although in some cases
1689     // we might discard a higher "now" value in deference to a slightly lower but freshly
1690     // installed obs value.   That's entirely benign -- it admits no new orderings compared
1691     // to (a) or (b) -- and greatly reduces coherence traffic.
1692     // We might also condition (c) on the magnitude of the delta between obs and now.
1693     // Avoiding excessive CAS operations to hot RW locations is critical.
1694     // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1695     return (prev == obsv) ? now : obsv ;
1696   } else {
1697     return oldgetTimeNanos();
1698   }
1699 }
1700 
1701 // Time since start-up in seconds to a fine granularity.
1702 // Used by VMSelfDestructTimer and the MemProfiler.
1703 double os::elapsedTime() {
1704   return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1705 }
1706 
1707 jlong os::elapsed_counter() {
1708   return (jlong)(getTimeNanos() - first_hrtime);
1709 }
1710 
1711 jlong os::elapsed_frequency() {
1712    return hrtime_hz;
1713 }
1714 
1715 // Return the real, user, and system times in seconds from an
1716 // arbitrary fixed point in the past.
1717 bool os::getTimesSecs(double* process_real_time,
1718                   double* process_user_time,
1719                   double* process_system_time) {
1720   struct tms ticks;
1721   clock_t real_ticks = times(&ticks);
1722 
1723   if (real_ticks == (clock_t) (-1)) {
1724     return false;
1725   } else {
1726     double ticks_per_second = (double) clock_tics_per_sec;
1727     *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1728     *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1729     // For consistency return the real time from getTimeNanos()
1730     // converted to seconds.
1731     *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1732 
1733     return true;
1734   }
1735 }
1736 
1737 bool os::supports_vtime() { return true; }
1738 
1739 bool os::enable_vtime() {
1740   int fd = ::open("/proc/self/ctl", O_WRONLY);
1741   if (fd == -1)
1742     return false;
1743 
1744   long cmd[] = { PCSET, PR_MSACCT };
1745   int res = ::write(fd, cmd, sizeof(long) * 2);
1746   ::close(fd);
1747   if (res != sizeof(long) * 2)
1748     return false;
1749 
1750   return true;
1751 }
1752 
1753 bool os::vtime_enabled() {
1754   int fd = ::open("/proc/self/status", O_RDONLY);
1755   if (fd == -1)
1756     return false;
1757 
1758   pstatus_t status;
1759   int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1760   ::close(fd);
1761   if (res != sizeof(pstatus_t))
1762     return false;
1763 
1764   return status.pr_flags & PR_MSACCT;
1765 }
1766 
1767 double os::elapsedVTime() {
1768   return (double)gethrvtime() / (double)hrtime_hz;
1769 }
1770 
1771 // Used internally for comparisons only
1772 // getTimeMillis guaranteed to not move backwards on Solaris
1773 jlong getTimeMillis() {
1774   jlong nanotime = getTimeNanos();
1775   return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1776 }
1777 
1778 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1779 jlong os::javaTimeMillis() {
1780   timeval t;
1781   if (gettimeofday( &t, NULL) == -1)
1782     fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1783   return jlong(t.tv_sec) * 1000  +  jlong(t.tv_usec) / 1000;
1784 }
1785 
1786 jlong os::javaTimeNanos() {
1787   return (jlong)getTimeNanos();
1788 }
1789 
1790 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1791   info_ptr->max_value = ALL_64_BITS;      // gethrtime() uses all 64 bits
1792   info_ptr->may_skip_backward = false;    // not subject to resetting or drifting
1793   info_ptr->may_skip_forward = false;     // not subject to resetting or drifting
1794   info_ptr->kind = JVMTI_TIMER_ELAPSED;   // elapsed not CPU time
1795 }
1796 
1797 char * os::local_time_string(char *buf, size_t buflen) {
1798   struct tm t;
1799   time_t long_time;
1800   time(&long_time);
1801   localtime_r(&long_time, &t);
1802   jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1803                t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1804                t.tm_hour, t.tm_min, t.tm_sec);
1805   return buf;
1806 }
1807 
1808 // Note: os::shutdown() might be called very early during initialization, or
1809 // called from signal handler. Before adding something to os::shutdown(), make
1810 // sure it is async-safe and can handle partially initialized VM.
1811 void os::shutdown() {
1812 
1813   // allow PerfMemory to attempt cleanup of any persistent resources
1814   perfMemory_exit();
1815 
1816   // needs to remove object in file system
1817   AttachListener::abort();
1818 
1819   // flush buffered output, finish log files
1820   ostream_abort();
1821 
1822   // Check for abort hook
1823   abort_hook_t abort_hook = Arguments::abort_hook();
1824   if (abort_hook != NULL) {
1825     abort_hook();
1826   }
1827 }
1828 
1829 // Note: os::abort() might be called very early during initialization, or
1830 // called from signal handler. Before adding something to os::abort(), make
1831 // sure it is async-safe and can handle partially initialized VM.
1832 void os::abort(bool dump_core) {
1833   os::shutdown();
1834   if (dump_core) {
1835 #ifndef PRODUCT
1836     fdStream out(defaultStream::output_fd());
1837     out.print_raw("Current thread is ");
1838     char buf[16];
1839     jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1840     out.print_raw_cr(buf);
1841     out.print_raw_cr("Dumping core ...");
1842 #endif
1843     ::abort(); // dump core (for debugging)
1844   }
1845 
1846   ::exit(1);
1847 }
1848 
1849 // Die immediately, no exit hook, no abort hook, no cleanup.
1850 void os::die() {
1851   ::abort(); // dump core (for debugging)
1852 }
1853 
1854 // unused
1855 void os::set_error_file(const char *logfile) {}
1856 
1857 // DLL functions
1858 
1859 const char* os::dll_file_extension() { return ".so"; }
1860 
1861 // This must be hard coded because it's the system's temporary
1862 // directory not the java application's temp directory, ala java.io.tmpdir.
1863 const char* os::get_temp_directory() { return "/tmp"; }
1864 
1865 static bool file_exists(const char* filename) {
1866   struct stat statbuf;
1867   if (filename == NULL || strlen(filename) == 0) {
1868     return false;
1869   }
1870   return os::stat(filename, &statbuf) == 0;
1871 }
1872 
1873 bool os::dll_build_name(char* buffer, size_t buflen,
1874                         const char* pname, const char* fname) {
1875   bool retval = false;
1876   const size_t pnamelen = pname ? strlen(pname) : 0;
1877 
1878   // Return error on buffer overflow.
1879   if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1880     return retval;
1881   }
1882 
1883   if (pnamelen == 0) {
1884     snprintf(buffer, buflen, "lib%s.so", fname);
1885     retval = true;
1886   } else if (strchr(pname, *os::path_separator()) != NULL) {
1887     int n;
1888     char** pelements = split_path(pname, &n);
1889     if (pelements == NULL) {
1890       return false;
1891     }
1892     for (int i = 0 ; i < n ; i++) {
1893       // really shouldn't be NULL but what the heck, check can't hurt
1894       if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1895         continue; // skip the empty path values
1896       }
1897       snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1898       if (file_exists(buffer)) {
1899         retval = true;
1900         break;
1901       }
1902     }
1903     // release the storage
1904     for (int i = 0 ; i < n ; i++) {
1905       if (pelements[i] != NULL) {
1906         FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1907       }
1908     }
1909     if (pelements != NULL) {
1910       FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1911     }
1912   } else {
1913     snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1914     retval = true;
1915   }
1916   return retval;
1917 }
1918 
1919 // check if addr is inside libjvm.so
1920 bool os::address_is_in_vm(address addr) {
1921   static address libjvm_base_addr;
1922   Dl_info dlinfo;
1923 
1924   if (libjvm_base_addr == NULL) {
1925     dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1926     libjvm_base_addr = (address)dlinfo.dli_fbase;
1927     assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1928   }
1929 
1930   if (dladdr((void *)addr, &dlinfo)) {
1931     if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1932   }
1933 
1934   return false;
1935 }
1936 
1937 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1938 static dladdr1_func_type dladdr1_func = NULL;
1939 
1940 bool os::dll_address_to_function_name(address addr, char *buf,
1941                                       int buflen, int * offset) {
1942   Dl_info dlinfo;
1943 
1944   // dladdr1_func was initialized in os::init()
1945   if (dladdr1_func){
1946       // yes, we have dladdr1
1947 
1948       // Support for dladdr1 is checked at runtime; it may be
1949       // available even if the vm is built on a machine that does
1950       // not have dladdr1 support.  Make sure there is a value for
1951       // RTLD_DL_SYMENT.
1952       #ifndef RTLD_DL_SYMENT
1953       #define RTLD_DL_SYMENT 1
1954       #endif
1955 #ifdef _LP64
1956       Elf64_Sym * info;
1957 #else
1958       Elf32_Sym * info;
1959 #endif
1960       if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1961                        RTLD_DL_SYMENT)) {
1962         if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1963           if (buf != NULL) {
1964             if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1965               jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1966             }
1967             if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1968             return true;
1969         }
1970       }
1971       if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1972         if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1973            buf, buflen, offset, dlinfo.dli_fname)) {
1974           return true;
1975         }
1976       }
1977       if (buf != NULL) buf[0] = '\0';
1978       if (offset != NULL) *offset  = -1;
1979       return false;
1980   } else {
1981       // no, only dladdr is available
1982       if (dladdr((void *)addr, &dlinfo)) {
1983         if (buf != NULL) {
1984           if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1985             jio_snprintf(buf, buflen, dlinfo.dli_sname);
1986         }
1987         if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1988         return true;
1989       } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1990         if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1991           buf, buflen, offset, dlinfo.dli_fname)) {
1992           return true;
1993         }
1994       }
1995       if (buf != NULL) buf[0] = '\0';
1996       if (offset != NULL) *offset  = -1;
1997       return false;
1998   }
1999 }
2000 
2001 bool os::dll_address_to_library_name(address addr, char* buf,
2002                                      int buflen, int* offset) {
2003   Dl_info dlinfo;
2004 
2005   if (dladdr((void*)addr, &dlinfo)){
2006      if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2007      if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2008      return true;
2009   } else {
2010      if (buf) buf[0] = '\0';
2011      if (offset) *offset = -1;
2012      return false;
2013   }
2014 }
2015 
2016 // Prints the names and full paths of all opened dynamic libraries
2017 // for current process
2018 void os::print_dll_info(outputStream * st) {
2019     Dl_info dli;
2020     void *handle;
2021     Link_map *map;
2022     Link_map *p;
2023 
2024     st->print_cr("Dynamic libraries:"); st->flush();
2025 
2026     if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2027         st->print_cr("Error: Cannot print dynamic libraries.");
2028         return;
2029     }
2030     handle = dlopen(dli.dli_fname, RTLD_LAZY);
2031     if (handle == NULL) {
2032         st->print_cr("Error: Cannot print dynamic libraries.");
2033         return;
2034     }
2035     dlinfo(handle, RTLD_DI_LINKMAP, &map);
2036     if (map == NULL) {
2037         st->print_cr("Error: Cannot print dynamic libraries.");
2038         return;
2039     }
2040 
2041     while (map->l_prev != NULL)
2042         map = map->l_prev;
2043 
2044     while (map != NULL) {
2045         st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2046         map = map->l_next;
2047     }
2048 
2049     dlclose(handle);
2050 }
2051 
2052   // Loads .dll/.so and
2053   // in case of error it checks if .dll/.so was built for the
2054   // same architecture as Hotspot is running on
2055 
2056 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2057 {
2058   void * result= ::dlopen(filename, RTLD_LAZY);
2059   if (result != NULL) {
2060     // Successful loading
2061     return result;
2062   }
2063 
2064   Elf32_Ehdr elf_head;
2065 
2066   // Read system error message into ebuf
2067   // It may or may not be overwritten below
2068   ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2069   ebuf[ebuflen-1]='\0';
2070   int diag_msg_max_length=ebuflen-strlen(ebuf);
2071   char* diag_msg_buf=ebuf+strlen(ebuf);
2072 
2073   if (diag_msg_max_length==0) {
2074     // No more space in ebuf for additional diagnostics message
2075     return NULL;
2076   }
2077 
2078 
2079   int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2080 
2081   if (file_descriptor < 0) {
2082     // Can't open library, report dlerror() message
2083     return NULL;
2084   }
2085 
2086   bool failed_to_read_elf_head=
2087     (sizeof(elf_head)!=
2088         (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2089 
2090   ::close(file_descriptor);
2091   if (failed_to_read_elf_head) {
2092     // file i/o error - report dlerror() msg
2093     return NULL;
2094   }
2095 
2096   typedef struct {
2097     Elf32_Half  code;         // Actual value as defined in elf.h
2098     Elf32_Half  compat_class; // Compatibility of archs at VM's sense
2099     char        elf_class;    // 32 or 64 bit
2100     char        endianess;    // MSB or LSB
2101     char*       name;         // String representation
2102   } arch_t;
2103 
2104   static const arch_t arch_array[]={
2105     {EM_386,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2106     {EM_486,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2107     {EM_IA_64,       EM_IA_64,   ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2108     {EM_X86_64,      EM_X86_64,  ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2109     {EM_SPARC,       EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2110     {EM_SPARC32PLUS, EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2111     {EM_SPARCV9,     EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2112     {EM_PPC,         EM_PPC,     ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2113     {EM_PPC64,       EM_PPC64,   ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2114     {EM_ARM,         EM_ARM,     ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2115   };
2116 
2117   #if  (defined IA32)
2118     static  Elf32_Half running_arch_code=EM_386;
2119   #elif   (defined AMD64)
2120     static  Elf32_Half running_arch_code=EM_X86_64;
2121   #elif  (defined IA64)
2122     static  Elf32_Half running_arch_code=EM_IA_64;
2123   #elif  (defined __sparc) && (defined _LP64)
2124     static  Elf32_Half running_arch_code=EM_SPARCV9;
2125   #elif  (defined __sparc) && (!defined _LP64)
2126     static  Elf32_Half running_arch_code=EM_SPARC;
2127   #elif  (defined __powerpc64__)
2128     static  Elf32_Half running_arch_code=EM_PPC64;
2129   #elif  (defined __powerpc__)
2130     static  Elf32_Half running_arch_code=EM_PPC;
2131   #elif (defined ARM)
2132     static  Elf32_Half running_arch_code=EM_ARM;
2133   #else
2134     #error Method os::dll_load requires that one of following is defined:\
2135          IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2136   #endif
2137 
2138   // Identify compatability class for VM's architecture and library's architecture
2139   // Obtain string descriptions for architectures
2140 
2141   arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2142   int running_arch_index=-1;
2143 
2144   for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2145     if (running_arch_code == arch_array[i].code) {
2146       running_arch_index    = i;
2147     }
2148     if (lib_arch.code == arch_array[i].code) {
2149       lib_arch.compat_class = arch_array[i].compat_class;
2150       lib_arch.name         = arch_array[i].name;
2151     }
2152   }
2153 
2154   assert(running_arch_index != -1,
2155     "Didn't find running architecture code (running_arch_code) in arch_array");
2156   if (running_arch_index == -1) {
2157     // Even though running architecture detection failed
2158     // we may still continue with reporting dlerror() message
2159     return NULL;
2160   }
2161 
2162   if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2163     ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2164     return NULL;
2165   }
2166 
2167   if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2168     ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2169     return NULL;
2170   }
2171 
2172   if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2173     if ( lib_arch.name!=NULL ) {
2174       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2175         " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2176         lib_arch.name, arch_array[running_arch_index].name);
2177     } else {
2178       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2179       " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2180         lib_arch.code,
2181         arch_array[running_arch_index].name);
2182     }
2183   }
2184 
2185   return NULL;
2186 }
2187 
2188 void* os::dll_lookup(void* handle, const char* name) {
2189   return dlsym(handle, name);
2190 }
2191 
2192 int os::stat(const char *path, struct stat *sbuf) {
2193   char pathbuf[MAX_PATH];
2194   if (strlen(path) > MAX_PATH - 1) {
2195     errno = ENAMETOOLONG;
2196     return -1;
2197   }
2198   os::native_path(strcpy(pathbuf, path));
2199   return ::stat(pathbuf, sbuf);
2200 }
2201 
2202 static bool _print_ascii_file(const char* filename, outputStream* st) {
2203   int fd = ::open(filename, O_RDONLY);
2204   if (fd == -1) {
2205      return false;
2206   }
2207 
2208   char buf[32];
2209   int bytes;
2210   while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2211     st->print_raw(buf, bytes);
2212   }
2213 
2214   ::close(fd);
2215 
2216   return true;
2217 }
2218 
2219 void os::print_os_info_brief(outputStream* st) {
2220   os::Solaris::print_distro_info(st);
2221 
2222   os::Posix::print_uname_info(st);
2223 
2224   os::Solaris::print_libversion_info(st);
2225 }
2226 
2227 void os::print_os_info(outputStream* st) {
2228   st->print("OS:");
2229 
2230   os::Solaris::print_distro_info(st);
2231 
2232   os::Posix::print_uname_info(st);
2233 
2234   os::Solaris::print_libversion_info(st);
2235 
2236   os::Posix::print_rlimit_info(st);
2237 
2238   os::Posix::print_load_average(st);
2239 }
2240 
2241 void os::Solaris::print_distro_info(outputStream* st) {
2242   if (!_print_ascii_file("/etc/release", st)) {
2243       st->print("Solaris");
2244     }
2245     st->cr();
2246 }
2247 
2248 void os::Solaris::print_libversion_info(outputStream* st) {
2249   if (os::Solaris::T2_libthread()) {
2250     st->print("  (T2 libthread)");
2251   }
2252   else {
2253     st->print("  (T1 libthread)");
2254   }
2255   st->cr();
2256 }
2257 
2258 static bool check_addr0(outputStream* st) {
2259   jboolean status = false;
2260   int fd = ::open("/proc/self/map",O_RDONLY);
2261   if (fd >= 0) {
2262     prmap_t p;
2263     while(::read(fd, &p, sizeof(p)) > 0) {
2264       if (p.pr_vaddr == 0x0) {
2265         st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2266         st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2267         st->print("Access:");
2268         st->print("%s",(p.pr_mflags & MA_READ)  ? "r" : "-");
2269         st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2270         st->print("%s",(p.pr_mflags & MA_EXEC)  ? "x" : "-");
2271         st->cr();
2272         status = true;
2273       }
2274       ::close(fd);
2275     }
2276   }
2277   return status;
2278 }
2279 
2280 void os::pd_print_cpu_info(outputStream* st) {
2281   // Nothing to do for now.
2282 }
2283 
2284 void os::print_memory_info(outputStream* st) {
2285   st->print("Memory:");
2286   st->print(" %dk page", os::vm_page_size()>>10);
2287   st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2288   st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2289   st->cr();
2290   (void) check_addr0(st);
2291 }
2292 
2293 // Taken from /usr/include/sys/machsig.h  Supposed to be architecture specific
2294 // but they're the same for all the solaris architectures that we support.
2295 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2296                           "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2297                           "ILL_COPROC", "ILL_BADSTK" };
2298 
2299 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2300                           "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2301                           "FPE_FLTINV", "FPE_FLTSUB" };
2302 
2303 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2304 
2305 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2306 
2307 void os::print_siginfo(outputStream* st, void* siginfo) {
2308   st->print("siginfo:");
2309 
2310   const int buflen = 100;
2311   char buf[buflen];
2312   siginfo_t *si = (siginfo_t*)siginfo;
2313   st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2314   char *err = strerror(si->si_errno);
2315   if (si->si_errno != 0 && err != NULL) {
2316     st->print("si_errno=%s", err);
2317   } else {
2318     st->print("si_errno=%d", si->si_errno);
2319   }
2320   const int c = si->si_code;
2321   assert(c > 0, "unexpected si_code");
2322   switch (si->si_signo) {
2323   case SIGILL:
2324     st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2325     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2326     break;
2327   case SIGFPE:
2328     st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2329     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2330     break;
2331   case SIGSEGV:
2332     st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2333     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2334     break;
2335   case SIGBUS:
2336     st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2337     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2338     break;
2339   default:
2340     st->print(", si_code=%d", si->si_code);
2341     // no si_addr
2342   }
2343 
2344   if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2345       UseSharedSpaces) {
2346     FileMapInfo* mapinfo = FileMapInfo::current_info();
2347     if (mapinfo->is_in_shared_space(si->si_addr)) {
2348       st->print("\n\nError accessing class data sharing archive."   \
2349                 " Mapped file inaccessible during execution, "      \
2350                 " possible disk/network problem.");
2351     }
2352   }
2353   st->cr();
2354 }
2355 
2356 // Moved from whole group, because we need them here for diagnostic
2357 // prints.
2358 #define OLDMAXSIGNUM 32
2359 static int Maxsignum = 0;
2360 static int *ourSigFlags = NULL;
2361 
2362 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2363 
2364 int os::Solaris::get_our_sigflags(int sig) {
2365   assert(ourSigFlags!=NULL, "signal data structure not initialized");
2366   assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2367   return ourSigFlags[sig];
2368 }
2369 
2370 void os::Solaris::set_our_sigflags(int sig, int flags) {
2371   assert(ourSigFlags!=NULL, "signal data structure not initialized");
2372   assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2373   ourSigFlags[sig] = flags;
2374 }
2375 
2376 
2377 static const char* get_signal_handler_name(address handler,
2378                                            char* buf, int buflen) {
2379   int offset;
2380   bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2381   if (found) {
2382     // skip directory names
2383     const char *p1, *p2;
2384     p1 = buf;
2385     size_t len = strlen(os::file_separator());
2386     while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2387     jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2388   } else {
2389     jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2390   }
2391   return buf;
2392 }
2393 
2394 static void print_signal_handler(outputStream* st, int sig,
2395                                   char* buf, size_t buflen) {
2396   struct sigaction sa;
2397 
2398   sigaction(sig, NULL, &sa);
2399 
2400   st->print("%s: ", os::exception_name(sig, buf, buflen));
2401 
2402   address handler = (sa.sa_flags & SA_SIGINFO)
2403                   ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2404                   : CAST_FROM_FN_PTR(address, sa.sa_handler);
2405 
2406   if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2407     st->print("SIG_DFL");
2408   } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2409     st->print("SIG_IGN");
2410   } else {
2411     st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2412   }
2413 
2414   st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2415 
2416   address rh = VMError::get_resetted_sighandler(sig);
2417   // May be, handler was resetted by VMError?
2418   if(rh != NULL) {
2419     handler = rh;
2420     sa.sa_flags = VMError::get_resetted_sigflags(sig);
2421   }
2422 
2423   st->print(", sa_flags="   PTR32_FORMAT, sa.sa_flags);
2424 
2425   // Check: is it our handler?
2426   if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2427      handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2428     // It is our signal handler
2429     // check for flags
2430     if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2431       st->print(
2432         ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2433         os::Solaris::get_our_sigflags(sig));
2434     }
2435   }
2436   st->cr();
2437 }
2438 
2439 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2440   st->print_cr("Signal Handlers:");
2441   print_signal_handler(st, SIGSEGV, buf, buflen);
2442   print_signal_handler(st, SIGBUS , buf, buflen);
2443   print_signal_handler(st, SIGFPE , buf, buflen);
2444   print_signal_handler(st, SIGPIPE, buf, buflen);
2445   print_signal_handler(st, SIGXFSZ, buf, buflen);
2446   print_signal_handler(st, SIGILL , buf, buflen);
2447   print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2448   print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2449   print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2450   print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2451   print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2452   print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2453   print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2454   print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2455 }
2456 
2457 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2458 
2459 // Find the full path to the current module, libjvm.so
2460 void os::jvm_path(char *buf, jint buflen) {
2461   // Error checking.
2462   if (buflen < MAXPATHLEN) {
2463     assert(false, "must use a large-enough buffer");
2464     buf[0] = '\0';
2465     return;
2466   }
2467   // Lazy resolve the path to current module.
2468   if (saved_jvm_path[0] != 0) {
2469     strcpy(buf, saved_jvm_path);
2470     return;
2471   }
2472 
2473   Dl_info dlinfo;
2474   int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2475   assert(ret != 0, "cannot locate libjvm");
2476   realpath((char *)dlinfo.dli_fname, buf);
2477 
2478   if (Arguments::created_by_gamma_launcher()) {
2479     // Support for the gamma launcher.  Typical value for buf is
2480     // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".  If "/jre/lib/" appears at
2481     // the right place in the string, then assume we are installed in a JDK and
2482     // we're done.  Otherwise, check for a JAVA_HOME environment variable and fix
2483     // up the path so it looks like libjvm.so is installed there (append a
2484     // fake suffix hotspot/libjvm.so).
2485     const char *p = buf + strlen(buf) - 1;
2486     for (int count = 0; p > buf && count < 5; ++count) {
2487       for (--p; p > buf && *p != '/'; --p)
2488         /* empty */ ;
2489     }
2490 
2491     if (strncmp(p, "/jre/lib/", 9) != 0) {
2492       // Look for JAVA_HOME in the environment.
2493       char* java_home_var = ::getenv("JAVA_HOME");
2494       if (java_home_var != NULL && java_home_var[0] != 0) {
2495         char cpu_arch[12];
2496         char* jrelib_p;
2497         int   len;
2498         sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2499 #ifdef _LP64
2500         // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2501         if (strcmp(cpu_arch, "sparc") == 0) {
2502           strcat(cpu_arch, "v9");
2503         } else if (strcmp(cpu_arch, "i386") == 0) {
2504           strcpy(cpu_arch, "amd64");
2505         }
2506 #endif
2507         // Check the current module name "libjvm.so".
2508         p = strrchr(buf, '/');
2509         assert(strstr(p, "/libjvm") == p, "invalid library name");
2510 
2511         realpath(java_home_var, buf);
2512         // determine if this is a legacy image or modules image
2513         // modules image doesn't have "jre" subdirectory
2514         len = strlen(buf);
2515         jrelib_p = buf + len;
2516         snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2517         if (0 != access(buf, F_OK)) {
2518           snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2519         }
2520 
2521         if (0 == access(buf, F_OK)) {
2522           // Use current module name "libjvm.so"
2523           len = strlen(buf);
2524           snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2525         } else {
2526           // Go back to path of .so
2527           realpath((char *)dlinfo.dli_fname, buf);
2528         }
2529       }
2530     }
2531   }
2532 
2533   strcpy(saved_jvm_path, buf);
2534 }
2535 
2536 
2537 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2538   // no prefix required, not even "_"
2539 }
2540 
2541 
2542 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2543   // no suffix required
2544 }
2545 
2546 // This method is a copy of JDK's sysGetLastErrorString
2547 // from src/solaris/hpi/src/system_md.c
2548 
2549 size_t os::lasterror(char *buf, size_t len) {
2550 
2551   if (errno == 0)  return 0;
2552 
2553   const char *s = ::strerror(errno);
2554   size_t n = ::strlen(s);
2555   if (n >= len) {
2556     n = len - 1;
2557   }
2558   ::strncpy(buf, s, n);
2559   buf[n] = '\0';
2560   return n;
2561 }
2562 
2563 
2564 // sun.misc.Signal
2565 
2566 extern "C" {
2567   static void UserHandler(int sig, void *siginfo, void *context) {
2568     // Ctrl-C is pressed during error reporting, likely because the error
2569     // handler fails to abort. Let VM die immediately.
2570     if (sig == SIGINT && is_error_reported()) {
2571        os::die();
2572     }
2573 
2574     os::signal_notify(sig);
2575     // We do not need to reinstate the signal handler each time...
2576   }
2577 }
2578 
2579 void* os::user_handler() {
2580   return CAST_FROM_FN_PTR(void*, UserHandler);
2581 }
2582 
2583 extern "C" {
2584   typedef void (*sa_handler_t)(int);
2585   typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2586 }
2587 
2588 void* os::signal(int signal_number, void* handler) {
2589   struct sigaction sigAct, oldSigAct;
2590   sigfillset(&(sigAct.sa_mask));
2591   sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2592   sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2593 
2594   if (sigaction(signal_number, &sigAct, &oldSigAct))
2595     // -1 means registration failed
2596     return (void *)-1;
2597 
2598   return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2599 }
2600 
2601 void os::signal_raise(int signal_number) {
2602   raise(signal_number);
2603 }
2604 
2605 /*
2606  * The following code is moved from os.cpp for making this
2607  * code platform specific, which it is by its very nature.
2608  */
2609 
2610 // a counter for each possible signal value
2611 static int Sigexit = 0;
2612 static int Maxlibjsigsigs;
2613 static jint *pending_signals = NULL;
2614 static int *preinstalled_sigs = NULL;
2615 static struct sigaction *chainedsigactions = NULL;
2616 static sema_t sig_sem;
2617 typedef int (*version_getting_t)();
2618 version_getting_t os::Solaris::get_libjsig_version = NULL;
2619 static int libjsigversion = NULL;
2620 
2621 int os::sigexitnum_pd() {
2622   assert(Sigexit > 0, "signal memory not yet initialized");
2623   return Sigexit;
2624 }
2625 
2626 void os::Solaris::init_signal_mem() {
2627   // Initialize signal structures
2628   Maxsignum = SIGRTMAX;
2629   Sigexit = Maxsignum+1;
2630   assert(Maxsignum >0, "Unable to obtain max signal number");
2631 
2632   Maxlibjsigsigs = Maxsignum;
2633 
2634   // pending_signals has one int per signal
2635   // The additional signal is for SIGEXIT - exit signal to signal_thread
2636   pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2637   memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2638 
2639   if (UseSignalChaining) {
2640      chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2641        * (Maxsignum + 1), mtInternal);
2642      memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2643      preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2644      memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2645   }
2646   ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2647   memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2648 }
2649 
2650 void os::signal_init_pd() {
2651   int ret;
2652 
2653   ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2654   assert(ret == 0, "sema_init() failed");
2655 }
2656 
2657 void os::signal_notify(int signal_number) {
2658   int ret;
2659 
2660   Atomic::inc(&pending_signals[signal_number]);
2661   ret = ::sema_post(&sig_sem);
2662   assert(ret == 0, "sema_post() failed");
2663 }
2664 
2665 static int check_pending_signals(bool wait_for_signal) {
2666   int ret;
2667   while (true) {
2668     for (int i = 0; i < Sigexit + 1; i++) {
2669       jint n = pending_signals[i];
2670       if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2671         return i;
2672       }
2673     }
2674     if (!wait_for_signal) {
2675       return -1;
2676     }
2677     JavaThread *thread = JavaThread::current();
2678     ThreadBlockInVM tbivm(thread);
2679 
2680     bool threadIsSuspended;
2681     do {
2682       thread->set_suspend_equivalent();
2683       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2684       while((ret = ::sema_wait(&sig_sem)) == EINTR)
2685           ;
2686       assert(ret == 0, "sema_wait() failed");
2687 
2688       // were we externally suspended while we were waiting?
2689       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2690       if (threadIsSuspended) {
2691         //
2692         // The semaphore has been incremented, but while we were waiting
2693         // another thread suspended us. We don't want to continue running
2694         // while suspended because that would surprise the thread that
2695         // suspended us.
2696         //
2697         ret = ::sema_post(&sig_sem);
2698         assert(ret == 0, "sema_post() failed");
2699 
2700         thread->java_suspend_self();
2701       }
2702     } while (threadIsSuspended);
2703   }
2704 }
2705 
2706 int os::signal_lookup() {
2707   return check_pending_signals(false);
2708 }
2709 
2710 int os::signal_wait() {
2711   return check_pending_signals(true);
2712 }
2713 
2714 ////////////////////////////////////////////////////////////////////////////////
2715 // Virtual Memory
2716 
2717 static int page_size = -1;
2718 
2719 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later.  init_2() will
2720 // clear this var if support is not available.
2721 static bool has_map_align = true;
2722 
2723 int os::vm_page_size() {
2724   assert(page_size != -1, "must call os::init");
2725   return page_size;
2726 }
2727 
2728 // Solaris allocates memory by pages.
2729 int os::vm_allocation_granularity() {
2730   assert(page_size != -1, "must call os::init");
2731   return page_size;
2732 }
2733 
2734 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2735   int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2736   size_t size = bytes;
2737   char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2738   if (res != NULL) {
2739     if (UseNUMAInterleaving) {
2740       numa_make_global(addr, bytes);
2741     }
2742     return true;
2743   }
2744   return false;
2745 }
2746 
2747 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2748                        bool exec) {
2749   if (commit_memory(addr, bytes, exec)) {
2750     if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2751       // If the large page size has been set and the VM
2752       // is using large pages, use the large page size
2753       // if it is smaller than the alignment hint. This is
2754       // a case where the VM wants to use a larger alignment size
2755       // for its own reasons but still want to use large pages
2756       // (which is what matters to setting the mpss range.
2757       size_t page_size = 0;
2758       if (large_page_size() < alignment_hint) {
2759         assert(UseLargePages, "Expected to be here for large page use only");
2760         page_size = large_page_size();
2761       } else {
2762         // If the alignment hint is less than the large page
2763         // size, the VM wants a particular alignment (thus the hint)
2764         // for internal reasons.  Try to set the mpss range using
2765         // the alignment_hint.
2766         page_size = alignment_hint;
2767       }
2768       // Since this is a hint, ignore any failures.
2769       (void)Solaris::set_mpss_range(addr, bytes, page_size);
2770     }
2771     return true;
2772   }
2773   return false;
2774 }
2775 
2776 // Uncommit the pages in a specified region.
2777 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2778   if (madvise(addr, bytes, MADV_FREE) < 0) {
2779     debug_only(warning("MADV_FREE failed."));
2780     return;
2781   }
2782 }
2783 
2784 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2785   return os::commit_memory(addr, size);
2786 }
2787 
2788 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2789   return os::uncommit_memory(addr, size);
2790 }
2791 
2792 // Change the page size in a given range.
2793 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2794   assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2795   assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2796   if (UseLargePages && UseMPSS) {
2797     Solaris::set_mpss_range(addr, bytes, alignment_hint);
2798   }
2799 }
2800 
2801 // Tell the OS to make the range local to the first-touching LWP
2802 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2803   assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2804   if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2805     debug_only(warning("MADV_ACCESS_LWP failed."));
2806   }
2807 }
2808 
2809 // Tell the OS that this range would be accessed from different LWPs.
2810 void os::numa_make_global(char *addr, size_t bytes) {
2811   assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2812   if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2813     debug_only(warning("MADV_ACCESS_MANY failed."));
2814   }
2815 }
2816 
2817 // Get the number of the locality groups.
2818 size_t os::numa_get_groups_num() {
2819   size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2820   return n != -1 ? n : 1;
2821 }
2822 
2823 // Get a list of leaf locality groups. A leaf lgroup is group that
2824 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2825 // board. An LWP is assigned to one of these groups upon creation.
2826 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2827    if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2828      ids[0] = 0;
2829      return 1;
2830    }
2831    int result_size = 0, top = 1, bottom = 0, cur = 0;
2832    for (int k = 0; k < size; k++) {
2833      int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2834                                     (Solaris::lgrp_id_t*)&ids[top], size - top);
2835      if (r == -1) {
2836        ids[0] = 0;
2837        return 1;
2838      }
2839      if (!r) {
2840        // That's a leaf node.
2841        assert (bottom <= cur, "Sanity check");
2842        // Check if the node has memory
2843        if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2844                                    NULL, 0, LGRP_RSRC_MEM) > 0) {
2845          ids[bottom++] = ids[cur];
2846        }
2847      }
2848      top += r;
2849      cur++;
2850    }
2851    if (bottom == 0) {
2852      // Handle a situation, when the OS reports no memory available.
2853      // Assume UMA architecture.
2854      ids[0] = 0;
2855      return 1;
2856    }
2857    return bottom;
2858 }
2859 
2860 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2861 bool os::numa_topology_changed() {
2862   int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2863   if (is_stale != -1 && is_stale) {
2864     Solaris::lgrp_fini(Solaris::lgrp_cookie());
2865     Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2866     assert(c != 0, "Failure to initialize LGRP API");
2867     Solaris::set_lgrp_cookie(c);
2868     return true;
2869   }
2870   return false;
2871 }
2872 
2873 // Get the group id of the current LWP.
2874 int os::numa_get_group_id() {
2875   int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2876   if (lgrp_id == -1) {
2877     return 0;
2878   }
2879   const int size = os::numa_get_groups_num();
2880   int *ids = (int*)alloca(size * sizeof(int));
2881 
2882   // Get the ids of all lgroups with memory; r is the count.
2883   int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2884                                   (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2885   if (r <= 0) {
2886     return 0;
2887   }
2888   return ids[os::random() % r];
2889 }
2890 
2891 // Request information about the page.
2892 bool os::get_page_info(char *start, page_info* info) {
2893   const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2894   uint64_t addr = (uintptr_t)start;
2895   uint64_t outdata[2];
2896   uint_t validity = 0;
2897 
2898   if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2899     return false;
2900   }
2901 
2902   info->size = 0;
2903   info->lgrp_id = -1;
2904 
2905   if ((validity & 1) != 0) {
2906     if ((validity & 2) != 0) {
2907       info->lgrp_id = outdata[0];
2908     }
2909     if ((validity & 4) != 0) {
2910       info->size = outdata[1];
2911     }
2912     return true;
2913   }
2914   return false;
2915 }
2916 
2917 // Scan the pages from start to end until a page different than
2918 // the one described in the info parameter is encountered.
2919 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2920   const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2921   const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2922   uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2923   uint_t validity[MAX_MEMINFO_CNT];
2924 
2925   size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2926   uint64_t p = (uint64_t)start;
2927   while (p < (uint64_t)end) {
2928     addrs[0] = p;
2929     size_t addrs_count = 1;
2930     while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2931       addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2932       addrs_count++;
2933     }
2934 
2935     if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2936       return NULL;
2937     }
2938 
2939     size_t i = 0;
2940     for (; i < addrs_count; i++) {
2941       if ((validity[i] & 1) != 0) {
2942         if ((validity[i] & 4) != 0) {
2943           if (outdata[types * i + 1] != page_expected->size) {
2944             break;
2945           }
2946         } else
2947           if (page_expected->size != 0) {
2948             break;
2949           }
2950 
2951         if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2952           if (outdata[types * i] != page_expected->lgrp_id) {
2953             break;
2954           }
2955         }
2956       } else {
2957         return NULL;
2958       }
2959     }
2960 
2961     if (i != addrs_count) {
2962       if ((validity[i] & 2) != 0) {
2963         page_found->lgrp_id = outdata[types * i];
2964       } else {
2965         page_found->lgrp_id = -1;
2966       }
2967       if ((validity[i] & 4) != 0) {
2968         page_found->size = outdata[types * i + 1];
2969       } else {
2970         page_found->size = 0;
2971       }
2972       return (char*)addrs[i];
2973     }
2974 
2975     p = addrs[addrs_count - 1] + page_size;
2976   }
2977   return end;
2978 }
2979 
2980 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2981   size_t size = bytes;
2982   // Map uncommitted pages PROT_NONE so we fail early if we touch an
2983   // uncommitted page. Otherwise, the read/write might succeed if we
2984   // have enough swap space to back the physical page.
2985   return
2986     NULL != Solaris::mmap_chunk(addr, size,
2987                                 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2988                                 PROT_NONE);
2989 }
2990 
2991 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2992   char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2993 
2994   if (b == MAP_FAILED) {
2995     return NULL;
2996   }
2997   return b;
2998 }
2999 
3000 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3001   char* addr = requested_addr;
3002   int flags = MAP_PRIVATE | MAP_NORESERVE;
3003 
3004   assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3005 
3006   if (fixed) {
3007     flags |= MAP_FIXED;
3008   } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3009     flags |= MAP_ALIGN;
3010     addr = (char*) alignment_hint;
3011   }
3012 
3013   // Map uncommitted pages PROT_NONE so we fail early if we touch an
3014   // uncommitted page. Otherwise, the read/write might succeed if we
3015   // have enough swap space to back the physical page.
3016   return mmap_chunk(addr, bytes, flags, PROT_NONE);
3017 }
3018 
3019 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3020   char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3021 
3022   guarantee(requested_addr == NULL || requested_addr == addr,
3023             "OS failed to return requested mmap address.");
3024   return addr;
3025 }
3026 
3027 // Reserve memory at an arbitrary address, only if that area is
3028 // available (and not reserved for something else).
3029 
3030 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3031   const int max_tries = 10;
3032   char* base[max_tries];
3033   size_t size[max_tries];
3034 
3035   // Solaris adds a gap between mmap'ed regions.  The size of the gap
3036   // is dependent on the requested size and the MMU.  Our initial gap
3037   // value here is just a guess and will be corrected later.
3038   bool had_top_overlap = false;
3039   bool have_adjusted_gap = false;
3040   size_t gap = 0x400000;
3041 
3042   // Assert only that the size is a multiple of the page size, since
3043   // that's all that mmap requires, and since that's all we really know
3044   // about at this low abstraction level.  If we need higher alignment,
3045   // we can either pass an alignment to this method or verify alignment
3046   // in one of the methods further up the call chain.  See bug 5044738.
3047   assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3048 
3049   // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3050   // Give it a try, if the kernel honors the hint we can return immediately.
3051   char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3052 
3053   volatile int err = errno;
3054   if (addr == requested_addr) {
3055     return addr;
3056   } else if (addr != NULL) {
3057     pd_unmap_memory(addr, bytes);
3058   }
3059 
3060   if (PrintMiscellaneous && Verbose) {
3061     char buf[256];
3062     buf[0] = '\0';
3063     if (addr == NULL) {
3064       jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3065     }
3066     warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3067             PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3068             "%s", bytes, requested_addr, addr, buf);
3069   }
3070 
3071   // Address hint method didn't work.  Fall back to the old method.
3072   // In theory, once SNV becomes our oldest supported platform, this
3073   // code will no longer be needed.
3074   //
3075   // Repeatedly allocate blocks until the block is allocated at the
3076   // right spot. Give up after max_tries.
3077   int i;
3078   for (i = 0; i < max_tries; ++i) {
3079     base[i] = reserve_memory(bytes);
3080 
3081     if (base[i] != NULL) {
3082       // Is this the block we wanted?
3083       if (base[i] == requested_addr) {
3084         size[i] = bytes;
3085         break;
3086       }
3087 
3088       // check that the gap value is right
3089       if (had_top_overlap && !have_adjusted_gap) {
3090         size_t actual_gap = base[i-1] - base[i] - bytes;
3091         if (gap != actual_gap) {
3092           // adjust the gap value and retry the last 2 allocations
3093           assert(i > 0, "gap adjustment code problem");
3094           have_adjusted_gap = true;  // adjust the gap only once, just in case
3095           gap = actual_gap;
3096           if (PrintMiscellaneous && Verbose) {
3097             warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3098           }
3099           unmap_memory(base[i], bytes);
3100           unmap_memory(base[i-1], size[i-1]);
3101           i-=2;
3102           continue;
3103         }
3104       }
3105 
3106       // Does this overlap the block we wanted? Give back the overlapped
3107       // parts and try again.
3108       //
3109       // There is still a bug in this code: if top_overlap == bytes,
3110       // the overlap is offset from requested region by the value of gap.
3111       // In this case giving back the overlapped part will not work,
3112       // because we'll give back the entire block at base[i] and
3113       // therefore the subsequent allocation will not generate a new gap.
3114       // This could be fixed with a new algorithm that used larger
3115       // or variable size chunks to find the requested region -
3116       // but such a change would introduce additional complications.
3117       // It's rare enough that the planets align for this bug,
3118       // so we'll just wait for a fix for 6204603/5003415 which
3119       // will provide a mmap flag to allow us to avoid this business.
3120 
3121       size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3122       if (top_overlap >= 0 && top_overlap < bytes) {
3123         had_top_overlap = true;
3124         unmap_memory(base[i], top_overlap);
3125         base[i] += top_overlap;
3126         size[i] = bytes - top_overlap;
3127       } else {
3128         size_t bottom_overlap = base[i] + bytes - requested_addr;
3129         if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3130           if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3131             warning("attempt_reserve_memory_at: possible alignment bug");
3132           }
3133           unmap_memory(requested_addr, bottom_overlap);
3134           size[i] = bytes - bottom_overlap;
3135         } else {
3136           size[i] = bytes;
3137         }
3138       }
3139     }
3140   }
3141 
3142   // Give back the unused reserved pieces.
3143 
3144   for (int j = 0; j < i; ++j) {
3145     if (base[j] != NULL) {
3146       unmap_memory(base[j], size[j]);
3147     }
3148   }
3149 
3150   return (i < max_tries) ? requested_addr : NULL;
3151 }
3152 
3153 bool os::pd_release_memory(char* addr, size_t bytes) {
3154   size_t size = bytes;
3155   return munmap(addr, size) == 0;
3156 }
3157 
3158 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3159   assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3160          "addr must be page aligned");
3161   int retVal = mprotect(addr, bytes, prot);
3162   return retVal == 0;
3163 }
3164 
3165 // Protect memory (Used to pass readonly pages through
3166 // JNI GetArray<type>Elements with empty arrays.)
3167 // Also, used for serialization page and for compressed oops null pointer
3168 // checking.
3169 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3170                         bool is_committed) {
3171   unsigned int p = 0;
3172   switch (prot) {
3173   case MEM_PROT_NONE: p = PROT_NONE; break;
3174   case MEM_PROT_READ: p = PROT_READ; break;
3175   case MEM_PROT_RW:   p = PROT_READ|PROT_WRITE; break;
3176   case MEM_PROT_RWX:  p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3177   default:
3178     ShouldNotReachHere();
3179   }
3180   // is_committed is unused.
3181   return solaris_mprotect(addr, bytes, p);
3182 }
3183 
3184 // guard_memory and unguard_memory only happens within stack guard pages.
3185 // Since ISM pertains only to the heap, guard and unguard memory should not
3186 /// happen with an ISM region.
3187 bool os::guard_memory(char* addr, size_t bytes) {
3188   return solaris_mprotect(addr, bytes, PROT_NONE);
3189 }
3190 
3191 bool os::unguard_memory(char* addr, size_t bytes) {
3192   return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3193 }
3194 
3195 // Large page support
3196 
3197 // UseLargePages is the master flag to enable/disable large page memory.
3198 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3199 // effects can be described in the following table:
3200 //
3201 // UseLargePages UseMPSS UseISM
3202 //    false         *       *   => UseLargePages is the master switch, turning
3203 //                                 it off will turn off both UseMPSS and
3204 //                                 UseISM. VM will not use large page memory
3205 //                                 regardless the settings of UseMPSS/UseISM.
3206 //     true      false    false => Unless future Solaris provides other
3207 //                                 mechanism to use large page memory, this
3208 //                                 combination is equivalent to -UseLargePages,
3209 //                                 VM will not use large page memory
3210 //     true      true     false => JVM will use MPSS for large page memory.
3211 //                                 This is the default behavior.
3212 //     true      false    true  => JVM will use ISM for large page memory.
3213 //     true      true     true  => JVM will use ISM if it is available.
3214 //                                 Otherwise, JVM will fall back to MPSS.
3215 //                                 Becaues ISM is now available on all
3216 //                                 supported Solaris versions, this combination
3217 //                                 is equivalent to +UseISM -UseMPSS.
3218 
3219 static size_t _large_page_size = 0;
3220 
3221 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3222   // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3223   // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3224   // can support multiple page sizes.
3225 
3226   // Don't bother to probe page size because getpagesizes() comes with MPSS.
3227   // ISM is only recommended on old Solaris where there is no MPSS support.
3228   // Simply choose a conservative value as default.
3229   *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3230                SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3231                ARM_ONLY(2 * M);
3232 
3233   // ISM is available on all supported Solaris versions
3234   return true;
3235 }
3236 
3237 // Insertion sort for small arrays (descending order).
3238 static void insertion_sort_descending(size_t* array, int len) {
3239   for (int i = 0; i < len; i++) {
3240     size_t val = array[i];
3241     for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3242       size_t tmp = array[key];
3243       array[key] = array[key - 1];
3244       array[key - 1] = tmp;
3245     }
3246   }
3247 }
3248 
3249 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3250   const unsigned int usable_count = VM_Version::page_size_count();
3251   if (usable_count == 1) {
3252     return false;
3253   }
3254 
3255   // Find the right getpagesizes interface.  When solaris 11 is the minimum
3256   // build platform, getpagesizes() (without the '2') can be called directly.
3257   typedef int (*gps_t)(size_t[], int);
3258   gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3259   if (gps_func == NULL) {
3260     gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3261     if (gps_func == NULL) {
3262       if (warn) {
3263         warning("MPSS is not supported by the operating system.");
3264       }
3265       return false;
3266     }
3267   }
3268 
3269   // Fill the array of page sizes.
3270   int n = (*gps_func)(_page_sizes, page_sizes_max);
3271   assert(n > 0, "Solaris bug?");
3272 
3273   if (n == page_sizes_max) {
3274     // Add a sentinel value (necessary only if the array was completely filled
3275     // since it is static (zeroed at initialization)).
3276     _page_sizes[--n] = 0;
3277     DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3278   }
3279   assert(_page_sizes[n] == 0, "missing sentinel");
3280   trace_page_sizes("available page sizes", _page_sizes, n);
3281 
3282   if (n == 1) return false;     // Only one page size available.
3283 
3284   // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3285   // select up to usable_count elements.  First sort the array, find the first
3286   // acceptable value, then copy the usable sizes to the top of the array and
3287   // trim the rest.  Make sure to include the default page size :-).
3288   //
3289   // A better policy could get rid of the 4M limit by taking the sizes of the
3290   // important VM memory regions (java heap and possibly the code cache) into
3291   // account.
3292   insertion_sort_descending(_page_sizes, n);
3293   const size_t size_limit =
3294     FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3295   int beg;
3296   for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3297   const int end = MIN2((int)usable_count, n) - 1;
3298   for (int cur = 0; cur < end; ++cur, ++beg) {
3299     _page_sizes[cur] = _page_sizes[beg];
3300   }
3301   _page_sizes[end] = vm_page_size();
3302   _page_sizes[end + 1] = 0;
3303 
3304   if (_page_sizes[end] > _page_sizes[end - 1]) {
3305     // Default page size is not the smallest; sort again.
3306     insertion_sort_descending(_page_sizes, end + 1);
3307   }
3308   *page_size = _page_sizes[0];
3309 
3310   trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3311   return true;
3312 }
3313 
3314 void os::large_page_init() {
3315   if (!UseLargePages) {
3316     UseISM = false;
3317     UseMPSS = false;
3318     return;
3319   }
3320 
3321   // print a warning if any large page related flag is specified on command line
3322   bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages)        ||
3323                          !FLAG_IS_DEFAULT(UseISM)               ||
3324                          !FLAG_IS_DEFAULT(UseMPSS)              ||
3325                          !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3326   UseISM = UseISM &&
3327            Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3328   if (UseISM) {
3329     // ISM disables MPSS to be compatible with old JDK behavior
3330     UseMPSS = false;
3331     _page_sizes[0] = _large_page_size;
3332     _page_sizes[1] = vm_page_size();
3333     _page_sizes[2] = 0;
3334   }
3335 
3336   UseMPSS = UseMPSS &&
3337             Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3338 
3339   UseLargePages = UseISM || UseMPSS;
3340 }
3341 
3342 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3343   // Signal to OS that we want large pages for addresses
3344   // from addr, addr + bytes
3345   struct memcntl_mha mpss_struct;
3346   mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3347   mpss_struct.mha_pagesize = align;
3348   mpss_struct.mha_flags = 0;
3349   if (memcntl(start, bytes, MC_HAT_ADVISE,
3350               (caddr_t) &mpss_struct, 0, 0) < 0) {
3351     debug_only(warning("Attempt to use MPSS failed."));
3352     return false;
3353   }
3354   return true;
3355 }
3356 
3357 char* os::reserve_memory_special(size_t size, char* addr, bool exec) {
3358   // "exec" is passed in but not used.  Creating the shared image for
3359   // the code cache doesn't have an SHM_X executable permission to check.
3360   assert(UseLargePages && UseISM, "only for ISM large pages");
3361 
3362   char* retAddr = NULL;
3363   int shmid;
3364   key_t ismKey;
3365 
3366   bool warn_on_failure = UseISM &&
3367                         (!FLAG_IS_DEFAULT(UseLargePages)         ||
3368                          !FLAG_IS_DEFAULT(UseISM)                ||
3369                          !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3370                         );
3371   char msg[128];
3372 
3373   ismKey = IPC_PRIVATE;
3374 
3375   // Create a large shared memory region to attach to based on size.
3376   // Currently, size is the total size of the heap
3377   shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3378   if (shmid == -1){
3379      if (warn_on_failure) {
3380        jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3381        warning(msg);
3382      }
3383      return NULL;
3384   }
3385 
3386   // Attach to the region
3387   retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3388   int err = errno;
3389 
3390   // Remove shmid. If shmat() is successful, the actual shared memory segment
3391   // will be deleted when it's detached by shmdt() or when the process
3392   // terminates. If shmat() is not successful this will remove the shared
3393   // segment immediately.
3394   shmctl(shmid, IPC_RMID, NULL);
3395 
3396   if (retAddr == (char *) -1) {
3397     if (warn_on_failure) {
3398       jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3399       warning(msg);
3400     }
3401     return NULL;
3402   }
3403   if ((retAddr != NULL) && UseNUMAInterleaving) {
3404     numa_make_global(retAddr, size);
3405   }
3406 
3407   // The memory is committed
3408   address pc = CALLER_PC;
3409   MemTracker::record_virtual_memory_reserve((address)retAddr, size, pc);
3410   MemTracker::record_virtual_memory_commit((address)retAddr, size, pc);
3411 
3412   return retAddr;
3413 }
3414 
3415 bool os::release_memory_special(char* base, size_t bytes) {
3416   // detaching the SHM segment will also delete it, see reserve_memory_special()
3417   int rslt = shmdt(base);
3418   if (rslt == 0) {
3419     MemTracker::record_virtual_memory_uncommit((address)base, bytes);
3420     MemTracker::record_virtual_memory_release((address)base, bytes);
3421     return true;
3422   } else {
3423    return false;
3424   }
3425 }
3426 
3427 size_t os::large_page_size() {
3428   return _large_page_size;
3429 }
3430 
3431 // MPSS allows application to commit large page memory on demand; with ISM
3432 // the entire memory region must be allocated as shared memory.
3433 bool os::can_commit_large_page_memory() {
3434   return UseISM ? false : true;
3435 }
3436 
3437 bool os::can_execute_large_page_memory() {
3438   return UseISM ? false : true;
3439 }
3440 
3441 static int os_sleep(jlong millis, bool interruptible) {
3442   const jlong limit = INT_MAX;
3443   jlong prevtime;
3444   int res;
3445 
3446   while (millis > limit) {
3447     if ((res = os_sleep(limit, interruptible)) != OS_OK)
3448       return res;
3449     millis -= limit;
3450   }
3451 
3452   // Restart interrupted polls with new parameters until the proper delay
3453   // has been completed.
3454 
3455   prevtime = getTimeMillis();
3456 
3457   while (millis > 0) {
3458     jlong newtime;
3459 
3460     if (!interruptible) {
3461       // Following assert fails for os::yield_all:
3462       // assert(!thread->is_Java_thread(), "must not be java thread");
3463       res = poll(NULL, 0, millis);
3464     } else {
3465       JavaThread *jt = JavaThread::current();
3466 
3467       INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3468         os::Solaris::clear_interrupted);
3469     }
3470 
3471     // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3472     // thread.Interrupt.
3473 
3474     // See c/r 6751923. Poll can return 0 before time
3475     // has elapsed if time is set via clock_settime (as NTP does).
3476     // res == 0 if poll timed out (see man poll RETURN VALUES)
3477     // using the logic below checks that we really did
3478     // sleep at least "millis" if not we'll sleep again.
3479     if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3480       newtime = getTimeMillis();
3481       assert(newtime >= prevtime, "time moving backwards");
3482     /* Doing prevtime and newtime in microseconds doesn't help precision,
3483        and trying to round up to avoid lost milliseconds can result in a
3484        too-short delay. */
3485       millis -= newtime - prevtime;
3486       if(millis <= 0)
3487         return OS_OK;
3488       prevtime = newtime;
3489     } else
3490       return res;
3491   }
3492 
3493   return OS_OK;
3494 }
3495 
3496 // Read calls from inside the vm need to perform state transitions
3497 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3498   INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3499 }
3500 
3501 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3502   INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3503 }
3504 
3505 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3506   assert(thread == Thread::current(),  "thread consistency check");
3507 
3508   // TODO-FIXME: this should be removed.
3509   // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3510   // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3511   // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3512   // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3513   // is fooled into believing that the system is making progress. In the code below we block the
3514   // the watcher thread while safepoint is in progress so that it would not appear as though the
3515   // system is making progress.
3516   if (!Solaris::T2_libthread() &&
3517       thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3518     // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3519     // the entire safepoint, the watcher thread will  line up here during the safepoint.
3520     Threads_lock->lock_without_safepoint_check();
3521     Threads_lock->unlock();
3522   }
3523 
3524   if (thread->is_Java_thread()) {
3525     // This is a JavaThread so we honor the _thread_blocked protocol
3526     // even for sleeps of 0 milliseconds. This was originally done
3527     // as a workaround for bug 4338139. However, now we also do it
3528     // to honor the suspend-equivalent protocol.
3529 
3530     JavaThread *jt = (JavaThread *) thread;
3531     ThreadBlockInVM tbivm(jt);
3532 
3533     jt->set_suspend_equivalent();
3534     // cleared by handle_special_suspend_equivalent_condition() or
3535     // java_suspend_self() via check_and_wait_while_suspended()
3536 
3537     int ret_code;
3538     if (millis <= 0) {
3539       thr_yield();
3540       ret_code = 0;
3541     } else {
3542       // The original sleep() implementation did not create an
3543       // OSThreadWaitState helper for sleeps of 0 milliseconds.
3544       // I'm preserving that decision for now.
3545       OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3546 
3547       ret_code = os_sleep(millis, interruptible);
3548     }
3549 
3550     // were we externally suspended while we were waiting?
3551     jt->check_and_wait_while_suspended();
3552 
3553     return ret_code;
3554   }
3555 
3556   // non-JavaThread from this point on:
3557 
3558   if (millis <= 0) {
3559     thr_yield();
3560     return 0;
3561   }
3562 
3563   OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3564 
3565   return os_sleep(millis, interruptible);
3566 }
3567 
3568 int os::naked_sleep() {
3569   // %% make the sleep time an integer flag. for now use 1 millisec.
3570   return os_sleep(1, false);
3571 }
3572 
3573 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3574 void os::infinite_sleep() {
3575   while (true) {    // sleep forever ...
3576     ::sleep(100);   // ... 100 seconds at a time
3577   }
3578 }
3579 
3580 // Used to convert frequent JVM_Yield() to nops
3581 bool os::dont_yield() {
3582   if (DontYieldALot) {
3583     static hrtime_t last_time = 0;
3584     hrtime_t diff = getTimeNanos() - last_time;
3585 
3586     if (diff < DontYieldALotInterval * 1000000)
3587       return true;
3588 
3589     last_time += diff;
3590 
3591     return false;
3592   }
3593   else {
3594     return false;
3595   }
3596 }
3597 
3598 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3599 // the linux and win32 implementations do not.  This should be checked.
3600 
3601 void os::yield() {
3602   // Yields to all threads with same or greater priority
3603   os::sleep(Thread::current(), 0, false);
3604 }
3605 
3606 // Note that yield semantics are defined by the scheduling class to which
3607 // the thread currently belongs.  Typically, yield will _not yield to
3608 // other equal or higher priority threads that reside on the dispatch queues
3609 // of other CPUs.
3610 
3611 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3612 
3613 
3614 // On Solaris we found that yield_all doesn't always yield to all other threads.
3615 // There have been cases where there is a thread ready to execute but it doesn't
3616 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3617 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3618 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3619 // number of times yield_all is called in the one loop and increase the sleep
3620 // time after 8 attempts. If this fails too we increase the concurrency level
3621 // so that the starving thread would get an lwp
3622 
3623 void os::yield_all(int attempts) {
3624   // Yields to all threads, including threads with lower priorities
3625   if (attempts == 0) {
3626     os::sleep(Thread::current(), 1, false);
3627   } else {
3628     int iterations = attempts % 30;
3629     if (iterations == 0 && !os::Solaris::T2_libthread()) {
3630       // thr_setconcurrency and _getconcurrency make sense only under T1.
3631       int noofLWPS = thr_getconcurrency();
3632       if (noofLWPS < (Threads::number_of_threads() + 2)) {
3633         thr_setconcurrency(thr_getconcurrency() + 1);
3634       }
3635     } else if (iterations < 25) {
3636       os::sleep(Thread::current(), 1, false);
3637     } else {
3638       os::sleep(Thread::current(), 10, false);
3639     }
3640   }
3641 }
3642 
3643 // Called from the tight loops to possibly influence time-sharing heuristics
3644 void os::loop_breaker(int attempts) {
3645   os::yield_all(attempts);
3646 }
3647 
3648 
3649 // Interface for setting lwp priorities.  If we are using T2 libthread,
3650 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3651 // all of our threads will be assigned to real lwp's.  Using the thr_setprio
3652 // function is meaningless in this mode so we must adjust the real lwp's priority
3653 // The routines below implement the getting and setting of lwp priorities.
3654 //
3655 // Note: There are three priority scales used on Solaris.  Java priotities
3656 //       which range from 1 to 10, libthread "thr_setprio" scale which range
3657 //       from 0 to 127, and the current scheduling class of the process we
3658 //       are running in.  This is typically from -60 to +60.
3659 //       The setting of the lwp priorities in done after a call to thr_setprio
3660 //       so Java priorities are mapped to libthread priorities and we map from
3661 //       the latter to lwp priorities.  We don't keep priorities stored in
3662 //       Java priorities since some of our worker threads want to set priorities
3663 //       higher than all Java threads.
3664 //
3665 // For related information:
3666 // (1)  man -s 2 priocntl
3667 // (2)  man -s 4 priocntl
3668 // (3)  man dispadmin
3669 // =    librt.so
3670 // =    libthread/common/rtsched.c - thrp_setlwpprio().
3671 // =    ps -cL <pid> ... to validate priority.
3672 // =    sched_get_priority_min and _max
3673 //              pthread_create
3674 //              sched_setparam
3675 //              pthread_setschedparam
3676 //
3677 // Assumptions:
3678 // +    We assume that all threads in the process belong to the same
3679 //              scheduling class.   IE. an homogenous process.
3680 // +    Must be root or in IA group to change change "interactive" attribute.
3681 //              Priocntl() will fail silently.  The only indication of failure is when
3682 //              we read-back the value and notice that it hasn't changed.
3683 // +    Interactive threads enter the runq at the head, non-interactive at the tail.
3684 // +    For RT, change timeslice as well.  Invariant:
3685 //              constant "priority integral"
3686 //              Konst == TimeSlice * (60-Priority)
3687 //              Given a priority, compute appropriate timeslice.
3688 // +    Higher numerical values have higher priority.
3689 
3690 // sched class attributes
3691 typedef struct {
3692         int   schedPolicy;              // classID
3693         int   maxPrio;
3694         int   minPrio;
3695 } SchedInfo;
3696 
3697 
3698 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3699 
3700 #ifdef ASSERT
3701 static int  ReadBackValidate = 1;
3702 #endif
3703 static int  myClass     = 0;
3704 static int  myMin       = 0;
3705 static int  myMax       = 0;
3706 static int  myCur       = 0;
3707 static bool priocntl_enable = false;
3708 
3709 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3710 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3711 
3712 // Call the version of priocntl suitable for all supported versions
3713 // of Solaris. We need to call through this wrapper so that we can
3714 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3715 //
3716 // This code should be removed if we ever stop supporting Solaris 8
3717 // and earlier releases.
3718 
3719 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3720 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3721 static priocntl_type priocntl_ptr = priocntl_stub;
3722 
3723 // Stub to set the value of the real pointer, and then call the real
3724 // function.
3725 
3726 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3727   // Try Solaris 8- name only.
3728   priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3729   guarantee(tmp != NULL, "priocntl function not found.");
3730   priocntl_ptr = tmp;
3731   return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3732 }
3733 
3734 
3735 // lwp_priocntl_init
3736 //
3737 // Try to determine the priority scale for our process.
3738 //
3739 // Return errno or 0 if OK.
3740 //
3741 static
3742 int     lwp_priocntl_init ()
3743 {
3744   int rslt;
3745   pcinfo_t ClassInfo;
3746   pcparms_t ParmInfo;
3747   int i;
3748 
3749   if (!UseThreadPriorities) return 0;
3750 
3751   // We are using Bound threads, we need to determine our priority ranges
3752   if (os::Solaris::T2_libthread() || UseBoundThreads) {
3753     // If ThreadPriorityPolicy is 1, switch tables
3754     if (ThreadPriorityPolicy == 1) {
3755       for (i = 0 ; i < CriticalPriority+1; i++)
3756         os::java_to_os_priority[i] = prio_policy1[i];
3757     }
3758     if (UseCriticalJavaThreadPriority) {
3759       // MaxPriority always maps to the FX scheduling class and criticalPrio.
3760       // See set_native_priority() and set_lwp_class_and_priority().
3761       // Save original MaxPriority mapping in case attempt to
3762       // use critical priority fails.
3763       java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3764       // Set negative to distinguish from other priorities
3765       os::java_to_os_priority[MaxPriority] = -criticalPrio;
3766     }
3767   }
3768   // Not using Bound Threads, set to ThreadPolicy 1
3769   else {
3770     for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3771       os::java_to_os_priority[i] = prio_policy1[i];
3772     }
3773     return 0;
3774   }
3775 
3776   // Get IDs for a set of well-known scheduling classes.
3777   // TODO-FIXME: GETCLINFO returns the current # of classes in the
3778   // the system.  We should have a loop that iterates over the
3779   // classID values, which are known to be "small" integers.
3780 
3781   strcpy(ClassInfo.pc_clname, "TS");
3782   ClassInfo.pc_cid = -1;
3783   rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3784   if (rslt < 0) return errno;
3785   assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3786   tsLimits.schedPolicy = ClassInfo.pc_cid;
3787   tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3788   tsLimits.minPrio = -tsLimits.maxPrio;
3789 
3790   strcpy(ClassInfo.pc_clname, "IA");
3791   ClassInfo.pc_cid = -1;
3792   rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3793   if (rslt < 0) return errno;
3794   assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3795   iaLimits.schedPolicy = ClassInfo.pc_cid;
3796   iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3797   iaLimits.minPrio = -iaLimits.maxPrio;
3798 
3799   strcpy(ClassInfo.pc_clname, "RT");
3800   ClassInfo.pc_cid = -1;
3801   rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3802   if (rslt < 0) return errno;
3803   assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3804   rtLimits.schedPolicy = ClassInfo.pc_cid;
3805   rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3806   rtLimits.minPrio = 0;
3807 
3808   strcpy(ClassInfo.pc_clname, "FX");
3809   ClassInfo.pc_cid = -1;
3810   rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3811   if (rslt < 0) return errno;
3812   assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3813   fxLimits.schedPolicy = ClassInfo.pc_cid;
3814   fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3815   fxLimits.minPrio = 0;
3816 
3817   // Query our "current" scheduling class.
3818   // This will normally be IA, TS or, rarely, FX or RT.
3819   memset(&ParmInfo, 0, sizeof(ParmInfo));
3820   ParmInfo.pc_cid = PC_CLNULL;
3821   rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3822   if (rslt < 0) return errno;
3823   myClass = ParmInfo.pc_cid;
3824 
3825   // We now know our scheduling classId, get specific information
3826   // about the class.
3827   ClassInfo.pc_cid = myClass;
3828   ClassInfo.pc_clname[0] = 0;
3829   rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3830   if (rslt < 0) return errno;
3831 
3832   if (ThreadPriorityVerbose) {
3833     tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3834   }
3835 
3836   memset(&ParmInfo, 0, sizeof(pcparms_t));
3837   ParmInfo.pc_cid = PC_CLNULL;
3838   rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3839   if (rslt < 0) return errno;
3840 
3841   if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3842     myMin = rtLimits.minPrio;
3843     myMax = rtLimits.maxPrio;
3844   } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3845     iaparms_t *iaInfo  = (iaparms_t*)ParmInfo.pc_clparms;
3846     myMin = iaLimits.minPrio;
3847     myMax = iaLimits.maxPrio;
3848     myMax = MIN2(myMax, (int)iaInfo->ia_uprilim);       // clamp - restrict
3849   } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3850     tsparms_t *tsInfo  = (tsparms_t*)ParmInfo.pc_clparms;
3851     myMin = tsLimits.minPrio;
3852     myMax = tsLimits.maxPrio;
3853     myMax = MIN2(myMax, (int)tsInfo->ts_uprilim);       // clamp - restrict
3854   } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3855     fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3856     myMin = fxLimits.minPrio;
3857     myMax = fxLimits.maxPrio;
3858     myMax = MIN2(myMax, (int)fxInfo->fx_uprilim);       // clamp - restrict
3859   } else {
3860     // No clue - punt
3861     if (ThreadPriorityVerbose)
3862       tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3863     return EINVAL;      // no clue, punt
3864   }
3865 
3866   if (ThreadPriorityVerbose) {
3867     tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3868   }
3869 
3870   priocntl_enable = true;  // Enable changing priorities
3871   return 0;
3872 }
3873 
3874 #define IAPRI(x)        ((iaparms_t *)((x).pc_clparms))
3875 #define RTPRI(x)        ((rtparms_t *)((x).pc_clparms))
3876 #define TSPRI(x)        ((tsparms_t *)((x).pc_clparms))
3877 #define FXPRI(x)        ((fxparms_t *)((x).pc_clparms))
3878 
3879 
3880 // scale_to_lwp_priority
3881 //
3882 // Convert from the libthread "thr_setprio" scale to our current
3883 // lwp scheduling class scale.
3884 //
3885 static
3886 int     scale_to_lwp_priority (int rMin, int rMax, int x)
3887 {
3888   int v;
3889 
3890   if (x == 127) return rMax;            // avoid round-down
3891     v = (((x*(rMax-rMin)))/128)+rMin;
3892   return v;
3893 }
3894 
3895 
3896 // set_lwp_class_and_priority
3897 //
3898 // Set the class and priority of the lwp.  This call should only
3899 // be made when using bound threads (T2 threads are bound by default).
3900 //
3901 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3902                                int newPrio, int new_class, bool scale) {
3903   int rslt;
3904   int Actual, Expected, prv;
3905   pcparms_t ParmInfo;                   // for GET-SET
3906 #ifdef ASSERT
3907   pcparms_t ReadBack;                   // for readback
3908 #endif
3909 
3910   // Set priority via PC_GETPARMS, update, PC_SETPARMS
3911   // Query current values.
3912   // TODO: accelerate this by eliminating the PC_GETPARMS call.
3913   // Cache "pcparms_t" in global ParmCache.
3914   // TODO: elide set-to-same-value
3915 
3916   // If something went wrong on init, don't change priorities.
3917   if ( !priocntl_enable ) {
3918     if (ThreadPriorityVerbose)
3919       tty->print_cr("Trying to set priority but init failed, ignoring");
3920     return EINVAL;
3921   }
3922 
3923   // If lwp hasn't started yet, just return
3924   // the _start routine will call us again.
3925   if ( lwpid <= 0 ) {
3926     if (ThreadPriorityVerbose) {
3927       tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3928                      INTPTR_FORMAT " to %d, lwpid not set",
3929                      ThreadID, newPrio);
3930     }
3931     return 0;
3932   }
3933 
3934   if (ThreadPriorityVerbose) {
3935     tty->print_cr ("set_lwp_class_and_priority("
3936                    INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3937                    ThreadID, lwpid, newPrio);
3938   }
3939 
3940   memset(&ParmInfo, 0, sizeof(pcparms_t));
3941   ParmInfo.pc_cid = PC_CLNULL;
3942   rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3943   if (rslt < 0) return errno;
3944 
3945   int cur_class = ParmInfo.pc_cid;
3946   ParmInfo.pc_cid = (id_t)new_class;
3947 
3948   if (new_class == rtLimits.schedPolicy) {
3949     rtparms_t *rtInfo  = (rtparms_t*)ParmInfo.pc_clparms;
3950     rtInfo->rt_pri     = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3951                                                        rtLimits.maxPrio, newPrio)
3952                                : newPrio;
3953     rtInfo->rt_tqsecs  = RT_NOCHANGE;
3954     rtInfo->rt_tqnsecs = RT_NOCHANGE;
3955     if (ThreadPriorityVerbose) {
3956       tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3957     }
3958   } else if (new_class == iaLimits.schedPolicy) {
3959     iaparms_t* iaInfo  = (iaparms_t*)ParmInfo.pc_clparms;
3960     int maxClamped     = MIN2(iaLimits.maxPrio,
3961                               cur_class == new_class
3962                                 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3963     iaInfo->ia_upri    = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3964                                                        maxClamped, newPrio)
3965                                : newPrio;
3966     iaInfo->ia_uprilim = cur_class == new_class
3967                            ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3968     iaInfo->ia_mode    = IA_NOCHANGE;
3969     if (ThreadPriorityVerbose) {
3970       tty->print_cr("IA: [%d...%d] %d->%d\n",
3971                     iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3972     }
3973   } else if (new_class == tsLimits.schedPolicy) {
3974     tsparms_t* tsInfo  = (tsparms_t*)ParmInfo.pc_clparms;
3975     int maxClamped     = MIN2(tsLimits.maxPrio,
3976                               cur_class == new_class
3977                                 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3978     tsInfo->ts_upri    = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3979                                                        maxClamped, newPrio)
3980                                : newPrio;
3981     tsInfo->ts_uprilim = cur_class == new_class
3982                            ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3983     if (ThreadPriorityVerbose) {
3984       tty->print_cr("TS: [%d...%d] %d->%d\n",
3985                     tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3986     }
3987   } else if (new_class == fxLimits.schedPolicy) {
3988     fxparms_t* fxInfo  = (fxparms_t*)ParmInfo.pc_clparms;
3989     int maxClamped     = MIN2(fxLimits.maxPrio,
3990                               cur_class == new_class
3991                                 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3992     fxInfo->fx_upri    = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3993                                                        maxClamped, newPrio)
3994                                : newPrio;
3995     fxInfo->fx_uprilim = cur_class == new_class
3996                            ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3997     fxInfo->fx_tqsecs  = FX_NOCHANGE;
3998     fxInfo->fx_tqnsecs = FX_NOCHANGE;
3999     if (ThreadPriorityVerbose) {
4000       tty->print_cr("FX: [%d...%d] %d->%d\n",
4001                     fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
4002     }
4003   } else {
4004     if (ThreadPriorityVerbose) {
4005       tty->print_cr("Unknown new scheduling class %d\n", new_class);
4006     }
4007     return EINVAL;    // no clue, punt
4008   }
4009 
4010   rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
4011   if (ThreadPriorityVerbose && rslt) {
4012     tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
4013   }
4014   if (rslt < 0) return errno;
4015 
4016 #ifdef ASSERT
4017   // Sanity check: read back what we just attempted to set.
4018   // In theory it could have changed in the interim ...
4019   //
4020   // The priocntl system call is tricky.
4021   // Sometimes it'll validate the priority value argument and
4022   // return EINVAL if unhappy.  At other times it fails silently.
4023   // Readbacks are prudent.
4024 
4025   if (!ReadBackValidate) return 0;
4026 
4027   memset(&ReadBack, 0, sizeof(pcparms_t));
4028   ReadBack.pc_cid = PC_CLNULL;
4029   rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
4030   assert(rslt >= 0, "priocntl failed");
4031   Actual = Expected = 0xBAD;
4032   assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
4033   if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
4034     Actual   = RTPRI(ReadBack)->rt_pri;
4035     Expected = RTPRI(ParmInfo)->rt_pri;
4036   } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
4037     Actual   = IAPRI(ReadBack)->ia_upri;
4038     Expected = IAPRI(ParmInfo)->ia_upri;
4039   } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
4040     Actual   = TSPRI(ReadBack)->ts_upri;
4041     Expected = TSPRI(ParmInfo)->ts_upri;
4042   } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
4043     Actual   = FXPRI(ReadBack)->fx_upri;
4044     Expected = FXPRI(ParmInfo)->fx_upri;
4045   } else {
4046     if (ThreadPriorityVerbose) {
4047       tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
4048                     ParmInfo.pc_cid);
4049     }
4050   }
4051 
4052   if (Actual != Expected) {
4053     if (ThreadPriorityVerbose) {
4054       tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4055                      lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4056     }
4057   }
4058 #endif
4059 
4060   return 0;
4061 }
4062 
4063 // Solaris only gives access to 128 real priorities at a time,
4064 // so we expand Java's ten to fill this range.  This would be better
4065 // if we dynamically adjusted relative priorities.
4066 //
4067 // The ThreadPriorityPolicy option allows us to select 2 different
4068 // priority scales.
4069 //
4070 // ThreadPriorityPolicy=0
4071 // Since the Solaris' default priority is MaximumPriority, we do not
4072 // set a priority lower than Max unless a priority lower than
4073 // NormPriority is requested.
4074 //
4075 // ThreadPriorityPolicy=1
4076 // This mode causes the priority table to get filled with
4077 // linear values.  NormPriority get's mapped to 50% of the
4078 // Maximum priority an so on.  This will cause VM threads
4079 // to get unfair treatment against other Solaris processes
4080 // which do not explicitly alter their thread priorities.
4081 //
4082 
4083 int os::java_to_os_priority[CriticalPriority + 1] = {
4084   -99999,         // 0 Entry should never be used
4085 
4086   0,              // 1 MinPriority
4087   32,             // 2
4088   64,             // 3
4089 
4090   96,             // 4
4091   127,            // 5 NormPriority
4092   127,            // 6
4093 
4094   127,            // 7
4095   127,            // 8
4096   127,            // 9 NearMaxPriority
4097 
4098   127,            // 10 MaxPriority
4099 
4100   -criticalPrio   // 11 CriticalPriority
4101 };
4102 
4103 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4104   OSThread* osthread = thread->osthread();
4105 
4106   // Save requested priority in case the thread hasn't been started
4107   osthread->set_native_priority(newpri);
4108 
4109   // Check for critical priority request
4110   bool fxcritical = false;
4111   if (newpri == -criticalPrio) {
4112     fxcritical = true;
4113     newpri = criticalPrio;
4114   }
4115 
4116   assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4117   if (!UseThreadPriorities) return OS_OK;
4118 
4119   int status = 0;
4120 
4121   if (!fxcritical) {
4122     // Use thr_setprio only if we have a priority that thr_setprio understands
4123     status = thr_setprio(thread->osthread()->thread_id(), newpri);
4124   }
4125 
4126   if (os::Solaris::T2_libthread() ||
4127       (UseBoundThreads && osthread->is_vm_created())) {
4128     int lwp_status =
4129       set_lwp_class_and_priority(osthread->thread_id(),
4130                                  osthread->lwp_id(),
4131                                  newpri,
4132                                  fxcritical ? fxLimits.schedPolicy : myClass,
4133                                  !fxcritical);
4134     if (lwp_status != 0 && fxcritical) {
4135       // Try again, this time without changing the scheduling class
4136       newpri = java_MaxPriority_to_os_priority;
4137       lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
4138                                               osthread->lwp_id(),
4139                                               newpri, myClass, false);
4140     }
4141     status |= lwp_status;
4142   }
4143   return (status == 0) ? OS_OK : OS_ERR;
4144 }
4145 
4146 
4147 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4148   int p;
4149   if ( !UseThreadPriorities ) {
4150     *priority_ptr = NormalPriority;
4151     return OS_OK;
4152   }
4153   int status = thr_getprio(thread->osthread()->thread_id(), &p);
4154   if (status != 0) {
4155     return OS_ERR;
4156   }
4157   *priority_ptr = p;
4158   return OS_OK;
4159 }
4160 
4161 
4162 // Hint to the underlying OS that a task switch would not be good.
4163 // Void return because it's a hint and can fail.
4164 void os::hint_no_preempt() {
4165   schedctl_start(schedctl_init());
4166 }
4167 
4168 void os::interrupt(Thread* thread) {
4169   assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4170 
4171   OSThread* osthread = thread->osthread();
4172 
4173   int isInterrupted = osthread->interrupted();
4174   if (!isInterrupted) {
4175       osthread->set_interrupted(true);
4176       OrderAccess::fence();
4177       // os::sleep() is implemented with either poll (NULL,0,timeout) or
4178       // by parking on _SleepEvent.  If the former, thr_kill will unwedge
4179       // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4180       ParkEvent * const slp = thread->_SleepEvent ;
4181       if (slp != NULL) slp->unpark() ;
4182   }
4183 
4184   // For JSR166:  unpark after setting status but before thr_kill -dl
4185   if (thread->is_Java_thread()) {
4186     ((JavaThread*)thread)->parker()->unpark();
4187   }
4188 
4189   // Handle interruptible wait() ...
4190   ParkEvent * const ev = thread->_ParkEvent ;
4191   if (ev != NULL) ev->unpark() ;
4192 
4193   // When events are used everywhere for os::sleep, then this thr_kill
4194   // will only be needed if UseVMInterruptibleIO is true.
4195 
4196   if (!isInterrupted) {
4197     int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4198     assert_status(status == 0, status, "thr_kill");
4199 
4200     // Bump thread interruption counter
4201     RuntimeService::record_thread_interrupt_signaled_count();
4202   }
4203 }
4204 
4205 
4206 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4207   assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4208 
4209   OSThread* osthread = thread->osthread();
4210 
4211   bool res = osthread->interrupted();
4212 
4213   // NOTE that since there is no "lock" around these two operations,
4214   // there is the possibility that the interrupted flag will be
4215   // "false" but that the interrupt event will be set. This is
4216   // intentional. The effect of this is that Object.wait() will appear
4217   // to have a spurious wakeup, which is not harmful, and the
4218   // possibility is so rare that it is not worth the added complexity
4219   // to add yet another lock. It has also been recommended not to put
4220   // the interrupted flag into the os::Solaris::Event structure,
4221   // because it hides the issue.
4222   if (res && clear_interrupted) {
4223     osthread->set_interrupted(false);
4224   }
4225   return res;
4226 }
4227 
4228 
4229 void os::print_statistics() {
4230 }
4231 
4232 int os::message_box(const char* title, const char* message) {
4233   int i;
4234   fdStream err(defaultStream::error_fd());
4235   for (i = 0; i < 78; i++) err.print_raw("=");
4236   err.cr();
4237   err.print_raw_cr(title);
4238   for (i = 0; i < 78; i++) err.print_raw("-");
4239   err.cr();
4240   err.print_raw_cr(message);
4241   for (i = 0; i < 78; i++) err.print_raw("=");
4242   err.cr();
4243 
4244   char buf[16];
4245   // Prevent process from exiting upon "read error" without consuming all CPU
4246   while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4247 
4248   return buf[0] == 'y' || buf[0] == 'Y';
4249 }
4250 
4251 // A lightweight implementation that does not suspend the target thread and
4252 // thus returns only a hint. Used for profiling only!
4253 ExtendedPC os::get_thread_pc(Thread* thread) {
4254   // Make sure that it is called by the watcher and the Threads lock is owned.
4255   assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4256   // For now, is only used to profile the VM Thread
4257   assert(thread->is_VM_thread(), "Can only be called for VMThread");
4258   ExtendedPC epc;
4259 
4260   GetThreadPC_Callback  cb(ProfileVM_lock);
4261   OSThread *osthread = thread->osthread();
4262   const int time_to_wait = 400; // 400ms wait for initial response
4263   int status = cb.interrupt(thread, time_to_wait);
4264 
4265   if (cb.is_done() ) {
4266     epc = cb.addr();
4267   } else {
4268     DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4269                               osthread->thread_id(), status););
4270     // epc is already NULL
4271   }
4272   return epc;
4273 }
4274 
4275 
4276 // This does not do anything on Solaris. This is basically a hook for being
4277 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4278 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4279   f(value, method, args, thread);
4280 }
4281 
4282 // This routine may be used by user applications as a "hook" to catch signals.
4283 // The user-defined signal handler must pass unrecognized signals to this
4284 // routine, and if it returns true (non-zero), then the signal handler must
4285 // return immediately.  If the flag "abort_if_unrecognized" is true, then this
4286 // routine will never retun false (zero), but instead will execute a VM panic
4287 // routine kill the process.
4288 //
4289 // If this routine returns false, it is OK to call it again.  This allows
4290 // the user-defined signal handler to perform checks either before or after
4291 // the VM performs its own checks.  Naturally, the user code would be making
4292 // a serious error if it tried to handle an exception (such as a null check
4293 // or breakpoint) that the VM was generating for its own correct operation.
4294 //
4295 // This routine may recognize any of the following kinds of signals:
4296 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4297 // os::Solaris::SIGasync
4298 // It should be consulted by handlers for any of those signals.
4299 // It explicitly does not recognize os::Solaris::SIGinterrupt
4300 //
4301 // The caller of this routine must pass in the three arguments supplied
4302 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4303 // field of the structure passed to sigaction().  This routine assumes that
4304 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4305 //
4306 // Note that the VM will print warnings if it detects conflicting signal
4307 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4308 //
4309 extern "C" JNIEXPORT int
4310 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4311                           int abort_if_unrecognized);
4312 
4313 
4314 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4315   int orig_errno = errno;  // Preserve errno value over signal handler.
4316   JVM_handle_solaris_signal(sig, info, ucVoid, true);
4317   errno = orig_errno;
4318 }
4319 
4320 /* Do not delete - if guarantee is ever removed,  a signal handler (even empty)
4321    is needed to provoke threads blocked on IO to return an EINTR
4322    Note: this explicitly does NOT call JVM_handle_solaris_signal and
4323    does NOT participate in signal chaining due to requirement for
4324    NOT setting SA_RESTART to make EINTR work. */
4325 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4326    if (UseSignalChaining) {
4327       struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4328       if (actp && actp->sa_handler) {
4329         vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4330       }
4331    }
4332 }
4333 
4334 // This boolean allows users to forward their own non-matching signals
4335 // to JVM_handle_solaris_signal, harmlessly.
4336 bool os::Solaris::signal_handlers_are_installed = false;
4337 
4338 // For signal-chaining
4339 bool os::Solaris::libjsig_is_loaded = false;
4340 typedef struct sigaction *(*get_signal_t)(int);
4341 get_signal_t os::Solaris::get_signal_action = NULL;
4342 
4343 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4344   struct sigaction *actp = NULL;
4345 
4346   if ((libjsig_is_loaded)  && (sig <= Maxlibjsigsigs)) {
4347     // Retrieve the old signal handler from libjsig
4348     actp = (*get_signal_action)(sig);
4349   }
4350   if (actp == NULL) {
4351     // Retrieve the preinstalled signal handler from jvm
4352     actp = get_preinstalled_handler(sig);
4353   }
4354 
4355   return actp;
4356 }
4357 
4358 static bool call_chained_handler(struct sigaction *actp, int sig,
4359                                  siginfo_t *siginfo, void *context) {
4360   // Call the old signal handler
4361   if (actp->sa_handler == SIG_DFL) {
4362     // It's more reasonable to let jvm treat it as an unexpected exception
4363     // instead of taking the default action.
4364     return false;
4365   } else if (actp->sa_handler != SIG_IGN) {
4366     if ((actp->sa_flags & SA_NODEFER) == 0) {
4367       // automaticlly block the signal
4368       sigaddset(&(actp->sa_mask), sig);
4369     }
4370 
4371     sa_handler_t hand;
4372     sa_sigaction_t sa;
4373     bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4374     // retrieve the chained handler
4375     if (siginfo_flag_set) {
4376       sa = actp->sa_sigaction;
4377     } else {
4378       hand = actp->sa_handler;
4379     }
4380 
4381     if ((actp->sa_flags & SA_RESETHAND) != 0) {
4382       actp->sa_handler = SIG_DFL;
4383     }
4384 
4385     // try to honor the signal mask
4386     sigset_t oset;
4387     thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4388 
4389     // call into the chained handler
4390     if (siginfo_flag_set) {
4391       (*sa)(sig, siginfo, context);
4392     } else {
4393       (*hand)(sig);
4394     }
4395 
4396     // restore the signal mask
4397     thr_sigsetmask(SIG_SETMASK, &oset, 0);
4398   }
4399   // Tell jvm's signal handler the signal is taken care of.
4400   return true;
4401 }
4402 
4403 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4404   bool chained = false;
4405   // signal-chaining
4406   if (UseSignalChaining) {
4407     struct sigaction *actp = get_chained_signal_action(sig);
4408     if (actp != NULL) {
4409       chained = call_chained_handler(actp, sig, siginfo, context);
4410     }
4411   }
4412   return chained;
4413 }
4414 
4415 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4416   assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4417   if (preinstalled_sigs[sig] != 0) {
4418     return &chainedsigactions[sig];
4419   }
4420   return NULL;
4421 }
4422 
4423 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4424 
4425   assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4426   assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4427   chainedsigactions[sig] = oldAct;
4428   preinstalled_sigs[sig] = 1;
4429 }
4430 
4431 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4432   // Check for overwrite.
4433   struct sigaction oldAct;
4434   sigaction(sig, (struct sigaction*)NULL, &oldAct);
4435   void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*,  oldAct.sa_sigaction)
4436                                       : CAST_FROM_FN_PTR(void*,  oldAct.sa_handler);
4437   if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4438       oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4439       oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4440     if (AllowUserSignalHandlers || !set_installed) {
4441       // Do not overwrite; user takes responsibility to forward to us.
4442       return;
4443     } else if (UseSignalChaining) {
4444       if (oktochain) {
4445         // save the old handler in jvm
4446         save_preinstalled_handler(sig, oldAct);
4447       } else {
4448         vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4449       }
4450       // libjsig also interposes the sigaction() call below and saves the
4451       // old sigaction on it own.
4452     } else {
4453       fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4454                     "%#lx for signal %d.", (long)oldhand, sig));
4455     }
4456   }
4457 
4458   struct sigaction sigAct;
4459   sigfillset(&(sigAct.sa_mask));
4460   sigAct.sa_handler = SIG_DFL;
4461 
4462   sigAct.sa_sigaction = signalHandler;
4463   // Handle SIGSEGV on alternate signal stack if
4464   // not using stack banging
4465   if (!UseStackBanging && sig == SIGSEGV) {
4466     sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4467   // Interruptible i/o requires SA_RESTART cleared so EINTR
4468   // is returned instead of restarting system calls
4469   } else if (sig == os::Solaris::SIGinterrupt()) {
4470     sigemptyset(&sigAct.sa_mask);
4471     sigAct.sa_handler = NULL;
4472     sigAct.sa_flags = SA_SIGINFO;
4473     sigAct.sa_sigaction = sigINTRHandler;
4474   } else {
4475     sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4476   }
4477   os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4478 
4479   sigaction(sig, &sigAct, &oldAct);
4480 
4481   void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4482                                        : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4483   assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4484 }
4485 
4486 
4487 #define DO_SIGNAL_CHECK(sig) \
4488   if (!sigismember(&check_signal_done, sig)) \
4489     os::Solaris::check_signal_handler(sig)
4490 
4491 // This method is a periodic task to check for misbehaving JNI applications
4492 // under CheckJNI, we can add any periodic checks here
4493 
4494 void os::run_periodic_checks() {
4495   // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4496   // thereby preventing a NULL checks.
4497   if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4498 
4499   if (check_signals == false) return;
4500 
4501   // SEGV and BUS if overridden could potentially prevent
4502   // generation of hs*.log in the event of a crash, debugging
4503   // such a case can be very challenging, so we absolutely
4504   // check for the following for a good measure:
4505   DO_SIGNAL_CHECK(SIGSEGV);
4506   DO_SIGNAL_CHECK(SIGILL);
4507   DO_SIGNAL_CHECK(SIGFPE);
4508   DO_SIGNAL_CHECK(SIGBUS);
4509   DO_SIGNAL_CHECK(SIGPIPE);
4510   DO_SIGNAL_CHECK(SIGXFSZ);
4511 
4512   // ReduceSignalUsage allows the user to override these handlers
4513   // see comments at the very top and jvm_solaris.h
4514   if (!ReduceSignalUsage) {
4515     DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4516     DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4517     DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4518     DO_SIGNAL_CHECK(BREAK_SIGNAL);
4519   }
4520 
4521   // See comments above for using JVM1/JVM2 and UseAltSigs
4522   DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4523   DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4524 
4525 }
4526 
4527 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4528 
4529 static os_sigaction_t os_sigaction = NULL;
4530 
4531 void os::Solaris::check_signal_handler(int sig) {
4532   char buf[O_BUFLEN];
4533   address jvmHandler = NULL;
4534 
4535   struct sigaction act;
4536   if (os_sigaction == NULL) {
4537     // only trust the default sigaction, in case it has been interposed
4538     os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4539     if (os_sigaction == NULL) return;
4540   }
4541 
4542   os_sigaction(sig, (struct sigaction*)NULL, &act);
4543 
4544   address thisHandler = (act.sa_flags & SA_SIGINFO)
4545     ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4546     : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4547 
4548 
4549   switch(sig) {
4550     case SIGSEGV:
4551     case SIGBUS:
4552     case SIGFPE:
4553     case SIGPIPE:
4554     case SIGXFSZ:
4555     case SIGILL:
4556       jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4557       break;
4558 
4559     case SHUTDOWN1_SIGNAL:
4560     case SHUTDOWN2_SIGNAL:
4561     case SHUTDOWN3_SIGNAL:
4562     case BREAK_SIGNAL:
4563       jvmHandler = (address)user_handler();
4564       break;
4565 
4566     default:
4567       int intrsig = os::Solaris::SIGinterrupt();
4568       int asynsig = os::Solaris::SIGasync();
4569 
4570       if (sig == intrsig) {
4571         jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4572       } else if (sig == asynsig) {
4573         jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4574       } else {
4575         return;
4576       }
4577       break;
4578   }
4579 
4580 
4581   if (thisHandler != jvmHandler) {
4582     tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4583     tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4584     tty->print_cr("  found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4585     // No need to check this sig any longer
4586     sigaddset(&check_signal_done, sig);
4587   } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4588     tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4589     tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4590     tty->print_cr("  found:" PTR32_FORMAT, act.sa_flags);
4591     // No need to check this sig any longer
4592     sigaddset(&check_signal_done, sig);
4593   }
4594 
4595   // Print all the signal handler state
4596   if (sigismember(&check_signal_done, sig)) {
4597     print_signal_handlers(tty, buf, O_BUFLEN);
4598   }
4599 
4600 }
4601 
4602 void os::Solaris::install_signal_handlers() {
4603   bool libjsigdone = false;
4604   signal_handlers_are_installed = true;
4605 
4606   // signal-chaining
4607   typedef void (*signal_setting_t)();
4608   signal_setting_t begin_signal_setting = NULL;
4609   signal_setting_t end_signal_setting = NULL;
4610   begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4611                                         dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4612   if (begin_signal_setting != NULL) {
4613     end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4614                                         dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4615     get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4616                                        dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4617     get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4618                                          dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4619     libjsig_is_loaded = true;
4620     if (os::Solaris::get_libjsig_version != NULL) {
4621       libjsigversion =  (*os::Solaris::get_libjsig_version)();
4622     }
4623     assert(UseSignalChaining, "should enable signal-chaining");
4624   }
4625   if (libjsig_is_loaded) {
4626     // Tell libjsig jvm is setting signal handlers
4627     (*begin_signal_setting)();
4628   }
4629 
4630   set_signal_handler(SIGSEGV, true, true);
4631   set_signal_handler(SIGPIPE, true, true);
4632   set_signal_handler(SIGXFSZ, true, true);
4633   set_signal_handler(SIGBUS, true, true);
4634   set_signal_handler(SIGILL, true, true);
4635   set_signal_handler(SIGFPE, true, true);
4636 
4637 
4638   if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4639 
4640     // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4641     // can not register overridable signals which might be > 32
4642     if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4643     // Tell libjsig jvm has finished setting signal handlers
4644       (*end_signal_setting)();
4645       libjsigdone = true;
4646     }
4647   }
4648 
4649   // Never ok to chain our SIGinterrupt
4650   set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4651   set_signal_handler(os::Solaris::SIGasync(), true, true);
4652 
4653   if (libjsig_is_loaded && !libjsigdone) {
4654     // Tell libjsig jvm finishes setting signal handlers
4655     (*end_signal_setting)();
4656   }
4657 
4658   // We don't activate signal checker if libjsig is in place, we trust ourselves
4659   // and if UserSignalHandler is installed all bets are off.
4660   // Log that signal checking is off only if -verbose:jni is specified.
4661   if (CheckJNICalls) {
4662     if (libjsig_is_loaded) {
4663       if (PrintJNIResolving) {
4664         tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4665       }
4666       check_signals = false;
4667     }
4668     if (AllowUserSignalHandlers) {
4669       if (PrintJNIResolving) {
4670         tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4671       }
4672       check_signals = false;
4673     }
4674   }
4675 }
4676 
4677 
4678 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4679 
4680 const char * signames[] = {
4681   "SIG0",
4682   "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4683   "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4684   "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4685   "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4686   "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4687   "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4688   "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4689   "SIGCANCEL", "SIGLOST"
4690 };
4691 
4692 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4693   if (0 < exception_code && exception_code <= SIGRTMAX) {
4694     // signal
4695     if (exception_code < sizeof(signames)/sizeof(const char*)) {
4696        jio_snprintf(buf, size, "%s", signames[exception_code]);
4697     } else {
4698        jio_snprintf(buf, size, "SIG%d", exception_code);
4699     }
4700     return buf;
4701   } else {
4702     return NULL;
4703   }
4704 }
4705 
4706 // (Static) wrappers for the new libthread API
4707 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4708 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4709 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4710 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4711 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4712 
4713 // (Static) wrapper for getisax(2) call.
4714 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4715 
4716 // (Static) wrappers for the liblgrp API
4717 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4718 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4719 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4720 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4721 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4722 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4723 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4724 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4725 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4726 
4727 // (Static) wrapper for meminfo() call.
4728 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4729 
4730 static address resolve_symbol_lazy(const char* name) {
4731   address addr = (address) dlsym(RTLD_DEFAULT, name);
4732   if(addr == NULL) {
4733     // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4734     addr = (address) dlsym(RTLD_NEXT, name);
4735   }
4736   return addr;
4737 }
4738 
4739 static address resolve_symbol(const char* name) {
4740   address addr = resolve_symbol_lazy(name);
4741   if(addr == NULL) {
4742     fatal(dlerror());
4743   }
4744   return addr;
4745 }
4746 
4747 
4748 
4749 // isT2_libthread()
4750 //
4751 // Routine to determine if we are currently using the new T2 libthread.
4752 //
4753 // We determine if we are using T2 by reading /proc/self/lstatus and
4754 // looking for a thread with the ASLWP bit set.  If we find this status
4755 // bit set, we must assume that we are NOT using T2.  The T2 team
4756 // has approved this algorithm.
4757 //
4758 // We need to determine if we are running with the new T2 libthread
4759 // since setting native thread priorities is handled differently
4760 // when using this library.  All threads created using T2 are bound
4761 // threads. Calling thr_setprio is meaningless in this case.
4762 //
4763 bool isT2_libthread() {
4764   static prheader_t * lwpArray = NULL;
4765   static int lwpSize = 0;
4766   static int lwpFile = -1;
4767   lwpstatus_t * that;
4768   char lwpName [128];
4769   bool isT2 = false;
4770 
4771 #define ADR(x)  ((uintptr_t)(x))
4772 #define LWPINDEX(ary,ix)   ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4773 
4774   lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4775   if (lwpFile < 0) {
4776       if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4777       return false;
4778   }
4779   lwpSize = 16*1024;
4780   for (;;) {
4781     ::lseek64 (lwpFile, 0, SEEK_SET);
4782     lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4783     if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4784       if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4785       break;
4786     }
4787     if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4788        // We got a good snapshot - now iterate over the list.
4789       int aslwpcount = 0;
4790       for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4791         that = LWPINDEX(lwpArray,i);
4792         if (that->pr_flags & PR_ASLWP) {
4793           aslwpcount++;
4794         }
4795       }
4796       if (aslwpcount == 0) isT2 = true;
4797       break;
4798     }
4799     lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4800     FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);  // retry.
4801   }
4802 
4803   FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4804   ::close (lwpFile);
4805   if (ThreadPriorityVerbose) {
4806     if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4807     else tty->print_cr("We are not running with a T2 libthread\n");
4808   }
4809   return isT2;
4810 }
4811 
4812 
4813 void os::Solaris::libthread_init() {
4814   address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4815 
4816   // Determine if we are running with the new T2 libthread
4817   os::Solaris::set_T2_libthread(isT2_libthread());
4818 
4819   lwp_priocntl_init();
4820 
4821   // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4822   if(func == NULL) {
4823     func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4824     // Guarantee that this VM is running on an new enough OS (5.6 or
4825     // later) that it will have a new enough libthread.so.
4826     guarantee(func != NULL, "libthread.so is too old.");
4827   }
4828 
4829   // Initialize the new libthread getstate API wrappers
4830   func = resolve_symbol("thr_getstate");
4831   os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4832 
4833   func = resolve_symbol("thr_setstate");
4834   os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4835 
4836   func = resolve_symbol("thr_setmutator");
4837   os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4838 
4839   func = resolve_symbol("thr_suspend_mutator");
4840   os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4841 
4842   func = resolve_symbol("thr_continue_mutator");
4843   os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4844 
4845   int size;
4846   void (*handler_info_func)(address *, int *);
4847   handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4848   handler_info_func(&handler_start, &size);
4849   handler_end = handler_start + size;
4850 }
4851 
4852 
4853 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4854 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4855 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4856 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4857 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4858 int os::Solaris::_mutex_scope = USYNC_THREAD;
4859 
4860 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4861 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4862 int_fnP_cond_tP os::Solaris::_cond_signal;
4863 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4864 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4865 int_fnP_cond_tP os::Solaris::_cond_destroy;
4866 int os::Solaris::_cond_scope = USYNC_THREAD;
4867 
4868 void os::Solaris::synchronization_init() {
4869   if(UseLWPSynchronization) {
4870     os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4871     os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4872     os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4873     os::Solaris::set_mutex_init(lwp_mutex_init);
4874     os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4875     os::Solaris::set_mutex_scope(USYNC_THREAD);
4876 
4877     os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4878     os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4879     os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4880     os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4881     os::Solaris::set_cond_init(lwp_cond_init);
4882     os::Solaris::set_cond_destroy(lwp_cond_destroy);
4883     os::Solaris::set_cond_scope(USYNC_THREAD);
4884   }
4885   else {
4886     os::Solaris::set_mutex_scope(USYNC_THREAD);
4887     os::Solaris::set_cond_scope(USYNC_THREAD);
4888 
4889     if(UsePthreads) {
4890       os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4891       os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4892       os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4893       os::Solaris::set_mutex_init(pthread_mutex_default_init);
4894       os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4895 
4896       os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4897       os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4898       os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4899       os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4900       os::Solaris::set_cond_init(pthread_cond_default_init);
4901       os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4902     }
4903     else {
4904       os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4905       os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4906       os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4907       os::Solaris::set_mutex_init(::mutex_init);
4908       os::Solaris::set_mutex_destroy(::mutex_destroy);
4909 
4910       os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4911       os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4912       os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4913       os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4914       os::Solaris::set_cond_init(::cond_init);
4915       os::Solaris::set_cond_destroy(::cond_destroy);
4916     }
4917   }
4918 }
4919 
4920 bool os::Solaris::liblgrp_init() {
4921   void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4922   if (handle != NULL) {
4923     os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4924     os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4925     os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4926     os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4927     os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4928     os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4929     os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4930     os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4931                                        dlsym(handle, "lgrp_cookie_stale")));
4932 
4933     lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4934     set_lgrp_cookie(c);
4935     return true;
4936   }
4937   return false;
4938 }
4939 
4940 void os::Solaris::misc_sym_init() {
4941   address func;
4942 
4943   // getisax
4944   func = resolve_symbol_lazy("getisax");
4945   if (func != NULL) {
4946     os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4947   }
4948 
4949   // meminfo
4950   func = resolve_symbol_lazy("meminfo");
4951   if (func != NULL) {
4952     os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4953   }
4954 }
4955 
4956 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4957   assert(_getisax != NULL, "_getisax not set");
4958   return _getisax(array, n);
4959 }
4960 
4961 // Symbol doesn't exist in Solaris 8 pset.h
4962 #ifndef PS_MYID
4963 #define PS_MYID -3
4964 #endif
4965 
4966 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4967 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4968 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4969 
4970 void init_pset_getloadavg_ptr(void) {
4971   pset_getloadavg_ptr =
4972     (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4973   if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4974     warning("pset_getloadavg function not found");
4975   }
4976 }
4977 
4978 int os::Solaris::_dev_zero_fd = -1;
4979 
4980 // this is called _before_ the global arguments have been parsed
4981 void os::init(void) {
4982   _initial_pid = getpid();
4983 
4984   max_hrtime = first_hrtime = gethrtime();
4985 
4986   init_random(1234567);
4987 
4988   page_size = sysconf(_SC_PAGESIZE);
4989   if (page_size == -1)
4990     fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4991                   strerror(errno)));
4992   init_page_sizes((size_t) page_size);
4993 
4994   Solaris::initialize_system_info();
4995 
4996   // Initialize misc. symbols as soon as possible, so we can use them
4997   // if we need them.
4998   Solaris::misc_sym_init();
4999 
5000   int fd = ::open("/dev/zero", O_RDWR);
5001   if (fd < 0) {
5002     fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
5003   } else {
5004     Solaris::set_dev_zero_fd(fd);
5005 
5006     // Close on exec, child won't inherit.
5007     fcntl(fd, F_SETFD, FD_CLOEXEC);
5008   }
5009 
5010   clock_tics_per_sec = CLK_TCK;
5011 
5012   // check if dladdr1() exists; dladdr1 can provide more information than
5013   // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5014   // and is available on linker patches for 5.7 and 5.8.
5015   // libdl.so must have been loaded, this call is just an entry lookup
5016   void * hdl = dlopen("libdl.so", RTLD_NOW);
5017   if (hdl)
5018     dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5019 
5020   // (Solaris only) this switches to calls that actually do locking.
5021   ThreadCritical::initialize();
5022 
5023   main_thread = thr_self();
5024 
5025   // Constant minimum stack size allowed. It must be at least
5026   // the minimum of what the OS supports (thr_min_stack()), and
5027   // enough to allow the thread to get to user bytecode execution.
5028   Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5029   // If the pagesize of the VM is greater than 8K determine the appropriate
5030   // number of initial guard pages.  The user can change this with the
5031   // command line arguments, if needed.
5032   if (vm_page_size() > 8*K) {
5033     StackYellowPages = 1;
5034     StackRedPages = 1;
5035     StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5036   }
5037 }
5038 
5039 // To install functions for atexit system call
5040 extern "C" {
5041   static void perfMemory_exit_helper() {
5042     perfMemory_exit();
5043   }
5044 }
5045 
5046 // this is called _after_ the global arguments have been parsed
5047 jint os::init_2(void) {
5048   // try to enable extended file IO ASAP, see 6431278
5049   os::Solaris::try_enable_extended_io();
5050 
5051   // Allocate a single page and mark it as readable for safepoint polling.  Also
5052   // use this first mmap call to check support for MAP_ALIGN.
5053   address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5054                                                       page_size,
5055                                                       MAP_PRIVATE | MAP_ALIGN,
5056                                                       PROT_READ);
5057   if (polling_page == NULL) {
5058     has_map_align = false;
5059     polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5060                                                 PROT_READ);
5061   }
5062 
5063   os::set_polling_page(polling_page);
5064 
5065 #ifndef PRODUCT
5066   if( Verbose && PrintMiscellaneous )
5067     tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5068 #endif
5069 
5070   if (!UseMembar) {
5071     address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5072     guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5073     os::set_memory_serialize_page( mem_serialize_page );
5074 
5075 #ifndef PRODUCT
5076     if(Verbose && PrintMiscellaneous)
5077       tty->print("[Memory Serialize  Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5078 #endif
5079   }
5080 
5081   // Check minimum allowable stack size for thread creation and to initialize
5082   // the java system classes, including StackOverflowError - depends on page
5083   // size.  Add a page for compiler2 recursion in main thread.
5084   // Add in 2*BytesPerWord times page size to account for VM stack during
5085   // class initialization depending on 32 or 64 bit VM.
5086   os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5087             (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5088                     2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5089 
5090   size_t threadStackSizeInBytes = ThreadStackSize * K;
5091   if (threadStackSizeInBytes != 0 &&
5092     threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5093     tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5094                   os::Solaris::min_stack_allowed/K);
5095     return JNI_ERR;
5096   }
5097 
5098   // For 64kbps there will be a 64kb page size, which makes
5099   // the usable default stack size quite a bit less.  Increase the
5100   // stack for 64kb (or any > than 8kb) pages, this increases
5101   // virtual memory fragmentation (since we're not creating the
5102   // stack on a power of 2 boundary.  The real fix for this
5103   // should be to fix the guard page mechanism.
5104 
5105   if (vm_page_size() > 8*K) {
5106       threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5107          ? threadStackSizeInBytes +
5108            ((StackYellowPages + StackRedPages) * vm_page_size())
5109          : 0;
5110       ThreadStackSize = threadStackSizeInBytes/K;
5111   }
5112 
5113   // Make the stack size a multiple of the page size so that
5114   // the yellow/red zones can be guarded.
5115   JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5116         vm_page_size()));
5117 
5118   Solaris::libthread_init();
5119 
5120   if (UseNUMA) {
5121     if (!Solaris::liblgrp_init()) {
5122       UseNUMA = false;
5123     } else {
5124       size_t lgrp_limit = os::numa_get_groups_num();
5125       int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5126       size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5127       FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5128       if (lgrp_num < 2) {
5129         // There's only one locality group, disable NUMA.
5130         UseNUMA = false;
5131       }
5132     }
5133     // ISM is not compatible with the NUMA allocator - it always allocates
5134     // pages round-robin across the lgroups.
5135     if (UseNUMA && UseLargePages && UseISM) {
5136       if (!FLAG_IS_DEFAULT(UseNUMA)) {
5137         if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseISM)) {
5138           UseLargePages = false;
5139         } else {
5140           warning("UseNUMA is not compatible with ISM large pages, disabling NUMA allocator");
5141           UseNUMA = false;
5142         }
5143       } else {
5144         UseNUMA = false;
5145       }
5146     }
5147     if (!UseNUMA && ForceNUMA) {
5148       UseNUMA = true;
5149     }
5150   }
5151 
5152   Solaris::signal_sets_init();
5153   Solaris::init_signal_mem();
5154   Solaris::install_signal_handlers();
5155 
5156   if (libjsigversion < JSIG_VERSION_1_4_1) {
5157     Maxlibjsigsigs = OLDMAXSIGNUM;
5158   }
5159 
5160   // initialize synchronization primitives to use either thread or
5161   // lwp synchronization (controlled by UseLWPSynchronization)
5162   Solaris::synchronization_init();
5163 
5164   if (MaxFDLimit) {
5165     // set the number of file descriptors to max. print out error
5166     // if getrlimit/setrlimit fails but continue regardless.
5167     struct rlimit nbr_files;
5168     int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5169     if (status != 0) {
5170       if (PrintMiscellaneous && (Verbose || WizardMode))
5171         perror("os::init_2 getrlimit failed");
5172     } else {
5173       nbr_files.rlim_cur = nbr_files.rlim_max;
5174       status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5175       if (status != 0) {
5176         if (PrintMiscellaneous && (Verbose || WizardMode))
5177           perror("os::init_2 setrlimit failed");
5178       }
5179     }
5180   }
5181 
5182   // Calculate theoretical max. size of Threads to guard gainst
5183   // artifical out-of-memory situations, where all available address-
5184   // space has been reserved by thread stacks. Default stack size is 1Mb.
5185   size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5186     JavaThread::stack_size_at_create() : (1*K*K);
5187   assert(pre_thread_stack_size != 0, "Must have a stack");
5188   // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5189   // we should start doing Virtual Memory banging. Currently when the threads will
5190   // have used all but 200Mb of space.
5191   size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5192   Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5193 
5194   // at-exit methods are called in the reverse order of their registration.
5195   // In Solaris 7 and earlier, atexit functions are called on return from
5196   // main or as a result of a call to exit(3C). There can be only 32 of
5197   // these functions registered and atexit() does not set errno. In Solaris
5198   // 8 and later, there is no limit to the number of functions registered
5199   // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5200   // functions are called upon dlclose(3DL) in addition to return from main
5201   // and exit(3C).
5202 
5203   if (PerfAllowAtExitRegistration) {
5204     // only register atexit functions if PerfAllowAtExitRegistration is set.
5205     // atexit functions can be delayed until process exit time, which
5206     // can be problematic for embedded VM situations. Embedded VMs should
5207     // call DestroyJavaVM() to assure that VM resources are released.
5208 
5209     // note: perfMemory_exit_helper atexit function may be removed in
5210     // the future if the appropriate cleanup code can be added to the
5211     // VM_Exit VMOperation's doit method.
5212     if (atexit(perfMemory_exit_helper) != 0) {
5213       warning("os::init2 atexit(perfMemory_exit_helper) failed");
5214     }
5215   }
5216 
5217   // Init pset_loadavg function pointer
5218   init_pset_getloadavg_ptr();
5219 
5220   return JNI_OK;
5221 }
5222 
5223 void os::init_3(void) {
5224   return;
5225 }
5226 
5227 // Mark the polling page as unreadable
5228 void os::make_polling_page_unreadable(void) {
5229   if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5230     fatal("Could not disable polling page");
5231 };
5232 
5233 // Mark the polling page as readable
5234 void os::make_polling_page_readable(void) {
5235   if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5236     fatal("Could not enable polling page");
5237 };
5238 
5239 // OS interface.
5240 
5241 bool os::check_heap(bool force) { return true; }
5242 
5243 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5244 static vsnprintf_t sol_vsnprintf = NULL;
5245 
5246 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5247   if (!sol_vsnprintf) {
5248     //search  for the named symbol in the objects that were loaded after libjvm
5249     void* where = RTLD_NEXT;
5250     if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5251         sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5252     if (!sol_vsnprintf){
5253       //search  for the named symbol in the objects that were loaded before libjvm
5254       where = RTLD_DEFAULT;
5255       if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5256         sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5257       assert(sol_vsnprintf != NULL, "vsnprintf not found");
5258     }
5259   }
5260   return (*sol_vsnprintf)(buf, count, fmt, argptr);
5261 }
5262 
5263 
5264 // Is a (classpath) directory empty?
5265 bool os::dir_is_empty(const char* path) {
5266   DIR *dir = NULL;
5267   struct dirent *ptr;
5268 
5269   dir = opendir(path);
5270   if (dir == NULL) return true;
5271 
5272   /* Scan the directory */
5273   bool result = true;
5274   char buf[sizeof(struct dirent) + MAX_PATH];
5275   struct dirent *dbuf = (struct dirent *) buf;
5276   while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5277     if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5278       result = false;
5279     }
5280   }
5281   closedir(dir);
5282   return result;
5283 }
5284 
5285 // This code originates from JDK's sysOpen and open64_w
5286 // from src/solaris/hpi/src/system_md.c
5287 
5288 #ifndef O_DELETE
5289 #define O_DELETE 0x10000
5290 #endif
5291 
5292 // Open a file. Unlink the file immediately after open returns
5293 // if the specified oflag has the O_DELETE flag set.
5294 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5295 
5296 int os::open(const char *path, int oflag, int mode) {
5297   if (strlen(path) > MAX_PATH - 1) {
5298     errno = ENAMETOOLONG;
5299     return -1;
5300   }
5301   int fd;
5302   int o_delete = (oflag & O_DELETE);
5303   oflag = oflag & ~O_DELETE;
5304 
5305   fd = ::open64(path, oflag, mode);
5306   if (fd == -1) return -1;
5307 
5308   //If the open succeeded, the file might still be a directory
5309   {
5310     struct stat64 buf64;
5311     int ret = ::fstat64(fd, &buf64);
5312     int st_mode = buf64.st_mode;
5313 
5314     if (ret != -1) {
5315       if ((st_mode & S_IFMT) == S_IFDIR) {
5316         errno = EISDIR;
5317         ::close(fd);
5318         return -1;
5319       }
5320     } else {
5321       ::close(fd);
5322       return -1;
5323     }
5324   }
5325     /*
5326      * 32-bit Solaris systems suffer from:
5327      *
5328      * - an historical default soft limit of 256 per-process file
5329      *   descriptors that is too low for many Java programs.
5330      *
5331      * - a design flaw where file descriptors created using stdio
5332      *   fopen must be less than 256, _even_ when the first limit above
5333      *   has been raised.  This can cause calls to fopen (but not calls to
5334      *   open, for example) to fail mysteriously, perhaps in 3rd party
5335      *   native code (although the JDK itself uses fopen).  One can hardly
5336      *   criticize them for using this most standard of all functions.
5337      *
5338      * We attempt to make everything work anyways by:
5339      *
5340      * - raising the soft limit on per-process file descriptors beyond
5341      *   256
5342      *
5343      * - As of Solaris 10u4, we can request that Solaris raise the 256
5344      *   stdio fopen limit by calling function enable_extended_FILE_stdio.
5345      *   This is done in init_2 and recorded in enabled_extended_FILE_stdio
5346      *
5347      * - If we are stuck on an old (pre 10u4) Solaris system, we can
5348      *   workaround the bug by remapping non-stdio file descriptors below
5349      *   256 to ones beyond 256, which is done below.
5350      *
5351      * See:
5352      * 1085341: 32-bit stdio routines should support file descriptors >255
5353      * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5354      * 6431278: Netbeans crash on 32 bit Solaris: need to call
5355      *          enable_extended_FILE_stdio() in VM initialisation
5356      * Giri Mandalika's blog
5357      * http://technopark02.blogspot.com/2005_05_01_archive.html
5358      */
5359 #ifndef  _LP64
5360      if ((!enabled_extended_FILE_stdio) && fd < 256) {
5361          int newfd = ::fcntl(fd, F_DUPFD, 256);
5362          if (newfd != -1) {
5363              ::close(fd);
5364              fd = newfd;
5365          }
5366      }
5367 #endif // 32-bit Solaris
5368     /*
5369      * All file descriptors that are opened in the JVM and not
5370      * specifically destined for a subprocess should have the
5371      * close-on-exec flag set.  If we don't set it, then careless 3rd
5372      * party native code might fork and exec without closing all
5373      * appropriate file descriptors (e.g. as we do in closeDescriptors in
5374      * UNIXProcess.c), and this in turn might:
5375      *
5376      * - cause end-of-file to fail to be detected on some file
5377      *   descriptors, resulting in mysterious hangs, or
5378      *
5379      * - might cause an fopen in the subprocess to fail on a system
5380      *   suffering from bug 1085341.
5381      *
5382      * (Yes, the default setting of the close-on-exec flag is a Unix
5383      * design flaw)
5384      *
5385      * See:
5386      * 1085341: 32-bit stdio routines should support file descriptors >255
5387      * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5388      * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5389      */
5390 #ifdef FD_CLOEXEC
5391     {
5392         int flags = ::fcntl(fd, F_GETFD);
5393         if (flags != -1)
5394             ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5395     }
5396 #endif
5397 
5398   if (o_delete != 0) {
5399     ::unlink(path);
5400   }
5401   return fd;
5402 }
5403 
5404 // create binary file, rewriting existing file if required
5405 int os::create_binary_file(const char* path, bool rewrite_existing) {
5406   int oflags = O_WRONLY | O_CREAT;
5407   if (!rewrite_existing) {
5408     oflags |= O_EXCL;
5409   }
5410   return ::open64(path, oflags, S_IREAD | S_IWRITE);
5411 }
5412 
5413 // return current position of file pointer
5414 jlong os::current_file_offset(int fd) {
5415   return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5416 }
5417 
5418 // move file pointer to the specified offset
5419 jlong os::seek_to_file_offset(int fd, jlong offset) {
5420   return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5421 }
5422 
5423 jlong os::lseek(int fd, jlong offset, int whence) {
5424   return (jlong) ::lseek64(fd, offset, whence);
5425 }
5426 
5427 char * os::native_path(char *path) {
5428   return path;
5429 }
5430 
5431 int os::ftruncate(int fd, jlong length) {
5432   return ::ftruncate64(fd, length);
5433 }
5434 
5435 int os::fsync(int fd)  {
5436   RESTARTABLE_RETURN_INT(::fsync(fd));
5437 }
5438 
5439 int os::available(int fd, jlong *bytes) {
5440   jlong cur, end;
5441   int mode;
5442   struct stat64 buf64;
5443 
5444   if (::fstat64(fd, &buf64) >= 0) {
5445     mode = buf64.st_mode;
5446     if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5447       /*
5448       * XXX: is the following call interruptible? If so, this might
5449       * need to go through the INTERRUPT_IO() wrapper as for other
5450       * blocking, interruptible calls in this file.
5451       */
5452       int n,ioctl_return;
5453 
5454       INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5455       if (ioctl_return>= 0) {
5456           *bytes = n;
5457         return 1;
5458       }
5459     }
5460   }
5461   if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5462     return 0;
5463   } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5464     return 0;
5465   } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5466     return 0;
5467   }
5468   *bytes = end - cur;
5469   return 1;
5470 }
5471 
5472 // Map a block of memory.
5473 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5474                      char *addr, size_t bytes, bool read_only,
5475                      bool allow_exec) {
5476   int prot;
5477   int flags;
5478 
5479   if (read_only) {
5480     prot = PROT_READ;
5481     flags = MAP_SHARED;
5482   } else {
5483     prot = PROT_READ | PROT_WRITE;
5484     flags = MAP_PRIVATE;
5485   }
5486 
5487   if (allow_exec) {
5488     prot |= PROT_EXEC;
5489   }
5490 
5491   if (addr != NULL) {
5492     flags |= MAP_FIXED;
5493   }
5494 
5495   char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5496                                      fd, file_offset);
5497   if (mapped_address == MAP_FAILED) {
5498     return NULL;
5499   }
5500   return mapped_address;
5501 }
5502 
5503 
5504 // Remap a block of memory.
5505 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5506                        char *addr, size_t bytes, bool read_only,
5507                        bool allow_exec) {
5508   // same as map_memory() on this OS
5509   return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5510                         allow_exec);
5511 }
5512 
5513 
5514 // Unmap a block of memory.
5515 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5516   return munmap(addr, bytes) == 0;
5517 }
5518 
5519 void os::pause() {
5520   char filename[MAX_PATH];
5521   if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5522     jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5523   } else {
5524     jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5525   }
5526 
5527   int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5528   if (fd != -1) {
5529     struct stat buf;
5530     ::close(fd);
5531     while (::stat(filename, &buf) == 0) {
5532       (void)::poll(NULL, 0, 100);
5533     }
5534   } else {
5535     jio_fprintf(stderr,
5536       "Could not open pause file '%s', continuing immediately.\n", filename);
5537   }
5538 }
5539 
5540 #ifndef PRODUCT
5541 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5542 // Turn this on if you need to trace synch operations.
5543 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5544 // and call record_synch_enable and record_synch_disable
5545 // around the computation of interest.
5546 
5547 void record_synch(char* name, bool returning);  // defined below
5548 
5549 class RecordSynch {
5550   char* _name;
5551  public:
5552   RecordSynch(char* name) :_name(name)
5553                  { record_synch(_name, false); }
5554   ~RecordSynch() { record_synch(_name,   true);  }
5555 };
5556 
5557 #define CHECK_SYNCH_OP(ret, name, params, args, inner)          \
5558 extern "C" ret name params {                                    \
5559   typedef ret name##_t params;                                  \
5560   static name##_t* implem = NULL;                               \
5561   static int callcount = 0;                                     \
5562   if (implem == NULL) {                                         \
5563     implem = (name##_t*) dlsym(RTLD_NEXT, #name);               \
5564     if (implem == NULL)  fatal(dlerror());                      \
5565   }                                                             \
5566   ++callcount;                                                  \
5567   RecordSynch _rs(#name);                                       \
5568   inner;                                                        \
5569   return implem args;                                           \
5570 }
5571 // in dbx, examine callcounts this way:
5572 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5573 
5574 #define CHECK_POINTER_OK(p) \
5575   (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5576 #define CHECK_MU \
5577   if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5578 #define CHECK_CV \
5579   if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5580 #define CHECK_P(p) \
5581   if (!CHECK_POINTER_OK(p))  fatal(false,  "Pointer must be in C heap only.");
5582 
5583 #define CHECK_MUTEX(mutex_op) \
5584 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5585 
5586 CHECK_MUTEX(   mutex_lock)
5587 CHECK_MUTEX(  _mutex_lock)
5588 CHECK_MUTEX( mutex_unlock)
5589 CHECK_MUTEX(_mutex_unlock)
5590 CHECK_MUTEX( mutex_trylock)
5591 CHECK_MUTEX(_mutex_trylock)
5592 
5593 #define CHECK_COND(cond_op) \
5594 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5595 
5596 CHECK_COND( cond_wait);
5597 CHECK_COND(_cond_wait);
5598 CHECK_COND(_cond_wait_cancel);
5599 
5600 #define CHECK_COND2(cond_op) \
5601 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5602 
5603 CHECK_COND2( cond_timedwait);
5604 CHECK_COND2(_cond_timedwait);
5605 CHECK_COND2(_cond_timedwait_cancel);
5606 
5607 // do the _lwp_* versions too
5608 #define mutex_t lwp_mutex_t
5609 #define cond_t  lwp_cond_t
5610 CHECK_MUTEX(  _lwp_mutex_lock)
5611 CHECK_MUTEX(  _lwp_mutex_unlock)
5612 CHECK_MUTEX(  _lwp_mutex_trylock)
5613 CHECK_MUTEX( __lwp_mutex_lock)
5614 CHECK_MUTEX( __lwp_mutex_unlock)
5615 CHECK_MUTEX( __lwp_mutex_trylock)
5616 CHECK_MUTEX(___lwp_mutex_lock)
5617 CHECK_MUTEX(___lwp_mutex_unlock)
5618 
5619 CHECK_COND(  _lwp_cond_wait);
5620 CHECK_COND( __lwp_cond_wait);
5621 CHECK_COND(___lwp_cond_wait);
5622 
5623 CHECK_COND2(  _lwp_cond_timedwait);
5624 CHECK_COND2( __lwp_cond_timedwait);
5625 #undef mutex_t
5626 #undef cond_t
5627 
5628 CHECK_SYNCH_OP(int, _lwp_suspend2,       (int lwp, int *n), (lwp, n), 0);
5629 CHECK_SYNCH_OP(int,__lwp_suspend2,       (int lwp, int *n), (lwp, n), 0);
5630 CHECK_SYNCH_OP(int, _lwp_kill,           (int lwp, int n),  (lwp, n), 0);
5631 CHECK_SYNCH_OP(int,__lwp_kill,           (int lwp, int n),  (lwp, n), 0);
5632 CHECK_SYNCH_OP(int, _lwp_sema_wait,      (lwp_sema_t* p),   (p),  CHECK_P(p));
5633 CHECK_SYNCH_OP(int,__lwp_sema_wait,      (lwp_sema_t* p),   (p),  CHECK_P(p));
5634 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv),  (cv), CHECK_CV);
5635 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv),  (cv), CHECK_CV);
5636 
5637 
5638 // recording machinery:
5639 
5640 enum { RECORD_SYNCH_LIMIT = 200 };
5641 char* record_synch_name[RECORD_SYNCH_LIMIT];
5642 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5643 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5644 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5645 int record_synch_count = 0;
5646 bool record_synch_enabled = false;
5647 
5648 // in dbx, examine recorded data this way:
5649 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5650 
5651 void record_synch(char* name, bool returning) {
5652   if (record_synch_enabled) {
5653     if (record_synch_count < RECORD_SYNCH_LIMIT) {
5654       record_synch_name[record_synch_count] = name;
5655       record_synch_returning[record_synch_count] = returning;
5656       record_synch_thread[record_synch_count] = thr_self();
5657       record_synch_arg0ptr[record_synch_count] = &name;
5658       record_synch_count++;
5659     }
5660     // put more checking code here:
5661     // ...
5662   }
5663 }
5664 
5665 void record_synch_enable() {
5666   // start collecting trace data, if not already doing so
5667   if (!record_synch_enabled)  record_synch_count = 0;
5668   record_synch_enabled = true;
5669 }
5670 
5671 void record_synch_disable() {
5672   // stop collecting trace data
5673   record_synch_enabled = false;
5674 }
5675 
5676 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5677 #endif // PRODUCT
5678 
5679 const intptr_t thr_time_off  = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5680 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5681                                (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5682 
5683 
5684 // JVMTI & JVM monitoring and management support
5685 // The thread_cpu_time() and current_thread_cpu_time() are only
5686 // supported if is_thread_cpu_time_supported() returns true.
5687 // They are not supported on Solaris T1.
5688 
5689 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5690 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5691 // of a thread.
5692 //
5693 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5694 // returns the fast estimate available on the platform.
5695 
5696 // hrtime_t gethrvtime() return value includes
5697 // user time but does not include system time
5698 jlong os::current_thread_cpu_time() {
5699   return (jlong) gethrvtime();
5700 }
5701 
5702 jlong os::thread_cpu_time(Thread *thread) {
5703   // return user level CPU time only to be consistent with
5704   // what current_thread_cpu_time returns.
5705   // thread_cpu_time_info() must be changed if this changes
5706   return os::thread_cpu_time(thread, false /* user time only */);
5707 }
5708 
5709 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5710   if (user_sys_cpu_time) {
5711     return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5712   } else {
5713     return os::current_thread_cpu_time();
5714   }
5715 }
5716 
5717 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5718   char proc_name[64];
5719   int count;
5720   prusage_t prusage;
5721   jlong lwp_time;
5722   int fd;
5723 
5724   sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5725                      getpid(),
5726                      thread->osthread()->lwp_id());
5727   fd = ::open(proc_name, O_RDONLY);
5728   if ( fd == -1 ) return -1;
5729 
5730   do {
5731     count = ::pread(fd,
5732                   (void *)&prusage.pr_utime,
5733                   thr_time_size,
5734                   thr_time_off);
5735   } while (count < 0 && errno == EINTR);
5736   ::close(fd);
5737   if ( count < 0 ) return -1;
5738 
5739   if (user_sys_cpu_time) {
5740     // user + system CPU time
5741     lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5742                  (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5743                  (jlong)prusage.pr_stime.tv_nsec +
5744                  (jlong)prusage.pr_utime.tv_nsec;
5745   } else {
5746     // user level CPU time only
5747     lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5748                 (jlong)prusage.pr_utime.tv_nsec;
5749   }
5750 
5751   return(lwp_time);
5752 }
5753 
5754 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5755   info_ptr->max_value = ALL_64_BITS;      // will not wrap in less than 64 bits
5756   info_ptr->may_skip_backward = false;    // elapsed time not wall time
5757   info_ptr->may_skip_forward = false;     // elapsed time not wall time
5758   info_ptr->kind = JVMTI_TIMER_USER_CPU;  // only user time is returned
5759 }
5760 
5761 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5762   info_ptr->max_value = ALL_64_BITS;      // will not wrap in less than 64 bits
5763   info_ptr->may_skip_backward = false;    // elapsed time not wall time
5764   info_ptr->may_skip_forward = false;     // elapsed time not wall time
5765   info_ptr->kind = JVMTI_TIMER_USER_CPU;  // only user time is returned
5766 }
5767 
5768 bool os::is_thread_cpu_time_supported() {
5769   if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5770     return true;
5771   } else {
5772     return false;
5773   }
5774 }
5775 
5776 // System loadavg support.  Returns -1 if load average cannot be obtained.
5777 // Return the load average for our processor set if the primitive exists
5778 // (Solaris 9 and later).  Otherwise just return system wide loadavg.
5779 int os::loadavg(double loadavg[], int nelem) {
5780   if (pset_getloadavg_ptr != NULL) {
5781     return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5782   } else {
5783     return ::getloadavg(loadavg, nelem);
5784   }
5785 }
5786 
5787 //---------------------------------------------------------------------------------
5788 
5789 bool os::find(address addr, outputStream* st) {
5790   Dl_info dlinfo;
5791   memset(&dlinfo, 0, sizeof(dlinfo));
5792   if (dladdr(addr, &dlinfo)) {
5793 #ifdef _LP64
5794     st->print("0x%016lx: ", addr);
5795 #else
5796     st->print("0x%08x: ", addr);
5797 #endif
5798     if (dlinfo.dli_sname != NULL)
5799       st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5800     else if (dlinfo.dli_fname)
5801       st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5802     else
5803       st->print("<absolute address>");
5804     if (dlinfo.dli_fname)  st->print(" in %s", dlinfo.dli_fname);
5805 #ifdef _LP64
5806     if (dlinfo.dli_fbase)  st->print(" at 0x%016lx", dlinfo.dli_fbase);
5807 #else
5808     if (dlinfo.dli_fbase)  st->print(" at 0x%08x", dlinfo.dli_fbase);
5809 #endif
5810     st->cr();
5811 
5812     if (Verbose) {
5813       // decode some bytes around the PC
5814       address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5815       address end   = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5816       address       lowest = (address) dlinfo.dli_sname;
5817       if (!lowest)  lowest = (address) dlinfo.dli_fbase;
5818       if (begin < lowest)  begin = lowest;
5819       Dl_info dlinfo2;
5820       if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5821           && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5822         end = (address) dlinfo2.dli_saddr;
5823       Disassembler::decode(begin, end, st);
5824     }
5825     return true;
5826   }
5827   return false;
5828 }
5829 
5830 // Following function has been added to support HotSparc's libjvm.so running
5831 // under Solaris production JDK 1.2.2 / 1.3.0.  These came from
5832 // src/solaris/hpi/native_threads in the EVM codebase.
5833 //
5834 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5835 // libraries and should thus be removed. We will leave it behind for a while
5836 // until we no longer want to able to run on top of 1.3.0 Solaris production
5837 // JDK. See 4341971.
5838 
5839 #define STACK_SLACK 0x800
5840 
5841 extern "C" {
5842   intptr_t sysThreadAvailableStackWithSlack() {
5843     stack_t st;
5844     intptr_t retval, stack_top;
5845     retval = thr_stksegment(&st);
5846     assert(retval == 0, "incorrect return value from thr_stksegment");
5847     assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5848     assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5849     stack_top=(intptr_t)st.ss_sp-st.ss_size;
5850     return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5851   }
5852 }
5853 
5854 // ObjectMonitor park-unpark infrastructure ...
5855 //
5856 // We implement Solaris and Linux PlatformEvents with the
5857 // obvious condvar-mutex-flag triple.
5858 // Another alternative that works quite well is pipes:
5859 // Each PlatformEvent consists of a pipe-pair.
5860 // The thread associated with the PlatformEvent
5861 // calls park(), which reads from the input end of the pipe.
5862 // Unpark() writes into the other end of the pipe.
5863 // The write-side of the pipe must be set NDELAY.
5864 // Unfortunately pipes consume a large # of handles.
5865 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5866 // Using pipes for the 1st few threads might be workable, however.
5867 //
5868 // park() is permitted to return spuriously.
5869 // Callers of park() should wrap the call to park() in
5870 // an appropriate loop.  A litmus test for the correct
5871 // usage of park is the following: if park() were modified
5872 // to immediately return 0 your code should still work,
5873 // albeit degenerating to a spin loop.
5874 //
5875 // An interesting optimization for park() is to use a trylock()
5876 // to attempt to acquire the mutex.  If the trylock() fails
5877 // then we know that a concurrent unpark() operation is in-progress.
5878 // in that case the park() code could simply set _count to 0
5879 // and return immediately.  The subsequent park() operation *might*
5880 // return immediately.  That's harmless as the caller of park() is
5881 // expected to loop.  By using trylock() we will have avoided a
5882 // avoided a context switch caused by contention on the per-thread mutex.
5883 //
5884 // TODO-FIXME:
5885 // 1.  Reconcile Doug's JSR166 j.u.c park-unpark with the
5886 //     objectmonitor implementation.
5887 // 2.  Collapse the JSR166 parker event, and the
5888 //     objectmonitor ParkEvent into a single "Event" construct.
5889 // 3.  In park() and unpark() add:
5890 //     assert (Thread::current() == AssociatedWith).
5891 // 4.  add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5892 //     1-out-of-N park() operations will return immediately.
5893 //
5894 // _Event transitions in park()
5895 //   -1 => -1 : illegal
5896 //    1 =>  0 : pass - return immediately
5897 //    0 => -1 : block
5898 //
5899 // _Event serves as a restricted-range semaphore.
5900 //
5901 // Another possible encoding of _Event would be with
5902 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5903 //
5904 // TODO-FIXME: add DTRACE probes for:
5905 // 1.   Tx parks
5906 // 2.   Ty unparks Tx
5907 // 3.   Tx resumes from park
5908 
5909 
5910 // value determined through experimentation
5911 #define ROUNDINGFIX 11
5912 
5913 // utility to compute the abstime argument to timedwait.
5914 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5915 
5916 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5917   // millis is the relative timeout time
5918   // abstime will be the absolute timeout time
5919   if (millis < 0)  millis = 0;
5920   struct timeval now;
5921   int status = gettimeofday(&now, NULL);
5922   assert(status == 0, "gettimeofday");
5923   jlong seconds = millis / 1000;
5924   jlong max_wait_period;
5925 
5926   if (UseLWPSynchronization) {
5927     // forward port of fix for 4275818 (not sleeping long enough)
5928     // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5929     // _lwp_cond_timedwait() used a round_down algorithm rather
5930     // than a round_up. For millis less than our roundfactor
5931     // it rounded down to 0 which doesn't meet the spec.
5932     // For millis > roundfactor we may return a bit sooner, but
5933     // since we can not accurately identify the patch level and
5934     // this has already been fixed in Solaris 9 and 8 we will
5935     // leave it alone rather than always rounding down.
5936 
5937     if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5938        // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5939            // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5940            max_wait_period = 21000000;
5941   } else {
5942     max_wait_period = 50000000;
5943   }
5944   millis %= 1000;
5945   if (seconds > max_wait_period) {      // see man cond_timedwait(3T)
5946      seconds = max_wait_period;
5947   }
5948   abstime->tv_sec = now.tv_sec  + seconds;
5949   long       usec = now.tv_usec + millis * 1000;
5950   if (usec >= 1000000) {
5951     abstime->tv_sec += 1;
5952     usec -= 1000000;
5953   }
5954   abstime->tv_nsec = usec * 1000;
5955   return abstime;
5956 }
5957 
5958 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5959 // Conceptually TryPark() should be equivalent to park(0).
5960 
5961 int os::PlatformEvent::TryPark() {
5962   for (;;) {
5963     const int v = _Event ;
5964     guarantee ((v == 0) || (v == 1), "invariant") ;
5965     if (Atomic::cmpxchg (0, &_Event, v) == v) return v  ;
5966   }
5967 }
5968 
5969 void os::PlatformEvent::park() {           // AKA: down()
5970   // Invariant: Only the thread associated with the Event/PlatformEvent
5971   // may call park().
5972   int v ;
5973   for (;;) {
5974       v = _Event ;
5975       if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5976   }
5977   guarantee (v >= 0, "invariant") ;
5978   if (v == 0) {
5979      // Do this the hard way by blocking ...
5980      // See http://monaco.sfbay/detail.jsf?cr=5094058.
5981      // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5982      // Only for SPARC >= V8PlusA
5983 #if defined(__sparc) && defined(COMPILER2)
5984      if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5985 #endif
5986      int status = os::Solaris::mutex_lock(_mutex);
5987      assert_status(status == 0, status,  "mutex_lock");
5988      guarantee (_nParked == 0, "invariant") ;
5989      ++ _nParked ;
5990      while (_Event < 0) {
5991         // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5992         // Treat this the same as if the wait was interrupted
5993         // With usr/lib/lwp going to kernel, always handle ETIME
5994         status = os::Solaris::cond_wait(_cond, _mutex);
5995         if (status == ETIME) status = EINTR ;
5996         assert_status(status == 0 || status == EINTR, status, "cond_wait");
5997      }
5998      -- _nParked ;
5999      _Event = 0 ;
6000      status = os::Solaris::mutex_unlock(_mutex);
6001      assert_status(status == 0, status, "mutex_unlock");
6002     // Paranoia to ensure our locked and lock-free paths interact
6003     // correctly with each other.
6004     OrderAccess::fence();
6005   }
6006 }
6007 
6008 int os::PlatformEvent::park(jlong millis) {
6009   guarantee (_nParked == 0, "invariant") ;
6010   int v ;
6011   for (;;) {
6012       v = _Event ;
6013       if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6014   }
6015   guarantee (v >= 0, "invariant") ;
6016   if (v != 0) return OS_OK ;
6017 
6018   int ret = OS_TIMEOUT;
6019   timestruc_t abst;
6020   compute_abstime (&abst, millis);
6021 
6022   // See http://monaco.sfbay/detail.jsf?cr=5094058.
6023   // For Solaris SPARC set fprs.FEF=0 prior to parking.
6024   // Only for SPARC >= V8PlusA
6025 #if defined(__sparc) && defined(COMPILER2)
6026  if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6027 #endif
6028   int status = os::Solaris::mutex_lock(_mutex);
6029   assert_status(status == 0, status, "mutex_lock");
6030   guarantee (_nParked == 0, "invariant") ;
6031   ++ _nParked ;
6032   while (_Event < 0) {
6033      int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6034      assert_status(status == 0 || status == EINTR ||
6035                    status == ETIME || status == ETIMEDOUT,
6036                    status, "cond_timedwait");
6037      if (!FilterSpuriousWakeups) break ;                // previous semantics
6038      if (status == ETIME || status == ETIMEDOUT) break ;
6039      // We consume and ignore EINTR and spurious wakeups.
6040   }
6041   -- _nParked ;
6042   if (_Event >= 0) ret = OS_OK ;
6043   _Event = 0 ;
6044   status = os::Solaris::mutex_unlock(_mutex);
6045   assert_status(status == 0, status, "mutex_unlock");
6046   // Paranoia to ensure our locked and lock-free paths interact
6047   // correctly with each other.
6048   OrderAccess::fence();
6049   return ret;
6050 }
6051 
6052 void os::PlatformEvent::unpark() {
6053   // Transitions for _Event:
6054   //    0 :=> 1
6055   //    1 :=> 1
6056   //   -1 :=> either 0 or 1; must signal target thread
6057   //          That is, we can safely transition _Event from -1 to either
6058   //          0 or 1. Forcing 1 is slightly more efficient for back-to-back
6059   //          unpark() calls.
6060   // See also: "Semaphores in Plan 9" by Mullender & Cox
6061   //
6062   // Note: Forcing a transition from "-1" to "1" on an unpark() means
6063   // that it will take two back-to-back park() calls for the owning
6064   // thread to block. This has the benefit of forcing a spurious return
6065   // from the first park() call after an unpark() call which will help
6066   // shake out uses of park() and unpark() without condition variables.
6067 
6068   if (Atomic::xchg(1, &_Event) >= 0) return;
6069 
6070   // If the thread associated with the event was parked, wake it.
6071   // Wait for the thread assoc with the PlatformEvent to vacate.
6072   int status = os::Solaris::mutex_lock(_mutex);
6073   assert_status(status == 0, status, "mutex_lock");
6074   int AnyWaiters = _nParked;
6075   status = os::Solaris::mutex_unlock(_mutex);
6076   assert_status(status == 0, status, "mutex_unlock");
6077   guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6078   if (AnyWaiters != 0) {
6079     // We intentional signal *after* dropping the lock
6080     // to avoid a common class of futile wakeups.
6081     status = os::Solaris::cond_signal(_cond);
6082     assert_status(status == 0, status, "cond_signal");
6083   }
6084 }
6085 
6086 // JSR166
6087 // -------------------------------------------------------
6088 
6089 /*
6090  * The solaris and linux implementations of park/unpark are fairly
6091  * conservative for now, but can be improved. They currently use a
6092  * mutex/condvar pair, plus _counter.
6093  * Park decrements _counter if > 0, else does a condvar wait.  Unpark
6094  * sets count to 1 and signals condvar.  Only one thread ever waits
6095  * on the condvar. Contention seen when trying to park implies that someone
6096  * is unparking you, so don't wait. And spurious returns are fine, so there
6097  * is no need to track notifications.
6098  */
6099 
6100 #define MAX_SECS 100000000
6101 /*
6102  * This code is common to linux and solaris and will be moved to a
6103  * common place in dolphin.
6104  *
6105  * The passed in time value is either a relative time in nanoseconds
6106  * or an absolute time in milliseconds. Either way it has to be unpacked
6107  * into suitable seconds and nanoseconds components and stored in the
6108  * given timespec structure.
6109  * Given time is a 64-bit value and the time_t used in the timespec is only
6110  * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6111  * overflow if times way in the future are given. Further on Solaris versions
6112  * prior to 10 there is a restriction (see cond_timedwait) that the specified
6113  * number of seconds, in abstime, is less than current_time  + 100,000,000.
6114  * As it will be 28 years before "now + 100000000" will overflow we can
6115  * ignore overflow and just impose a hard-limit on seconds using the value
6116  * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6117  * years from "now".
6118  */
6119 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6120   assert (time > 0, "convertTime");
6121 
6122   struct timeval now;
6123   int status = gettimeofday(&now, NULL);
6124   assert(status == 0, "gettimeofday");
6125 
6126   time_t max_secs = now.tv_sec + MAX_SECS;
6127 
6128   if (isAbsolute) {
6129     jlong secs = time / 1000;
6130     if (secs > max_secs) {
6131       absTime->tv_sec = max_secs;
6132     }
6133     else {
6134       absTime->tv_sec = secs;
6135     }
6136     absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6137   }
6138   else {
6139     jlong secs = time / NANOSECS_PER_SEC;
6140     if (secs >= MAX_SECS) {
6141       absTime->tv_sec = max_secs;
6142       absTime->tv_nsec = 0;
6143     }
6144     else {
6145       absTime->tv_sec = now.tv_sec + secs;
6146       absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6147       if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6148         absTime->tv_nsec -= NANOSECS_PER_SEC;
6149         ++absTime->tv_sec; // note: this must be <= max_secs
6150       }
6151     }
6152   }
6153   assert(absTime->tv_sec >= 0, "tv_sec < 0");
6154   assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6155   assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6156   assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6157 }
6158 
6159 void Parker::park(bool isAbsolute, jlong time) {
6160   // Ideally we'd do something useful while spinning, such
6161   // as calling unpackTime().
6162 
6163   // Optional fast-path check:
6164   // Return immediately if a permit is available.
6165   // We depend on Atomic::xchg() having full barrier semantics
6166   // since we are doing a lock-free update to _counter.
6167   if (Atomic::xchg(0, &_counter) > 0) return;
6168 
6169   // Optional fast-exit: Check interrupt before trying to wait
6170   Thread* thread = Thread::current();
6171   assert(thread->is_Java_thread(), "Must be JavaThread");
6172   JavaThread *jt = (JavaThread *)thread;
6173   if (Thread::is_interrupted(thread, false)) {
6174     return;
6175   }
6176 
6177   // First, demultiplex/decode time arguments
6178   timespec absTime;
6179   if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6180     return;
6181   }
6182   if (time > 0) {
6183     // Warning: this code might be exposed to the old Solaris time
6184     // round-down bugs.  Grep "roundingFix" for details.
6185     unpackTime(&absTime, isAbsolute, time);
6186   }
6187 
6188   // Enter safepoint region
6189   // Beware of deadlocks such as 6317397.
6190   // The per-thread Parker:: _mutex is a classic leaf-lock.
6191   // In particular a thread must never block on the Threads_lock while
6192   // holding the Parker:: mutex.  If safepoints are pending both the
6193   // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6194   ThreadBlockInVM tbivm(jt);
6195 
6196   // Don't wait if cannot get lock since interference arises from
6197   // unblocking.  Also. check interrupt before trying wait
6198   if (Thread::is_interrupted(thread, false) ||
6199       os::Solaris::mutex_trylock(_mutex) != 0) {
6200     return;
6201   }
6202 
6203   int status ;
6204 
6205   if (_counter > 0)  { // no wait needed
6206     _counter = 0;
6207     status = os::Solaris::mutex_unlock(_mutex);
6208     assert (status == 0, "invariant") ;
6209     // Paranoia to ensure our locked and lock-free paths interact
6210     // correctly with each other and Java-level accesses.
6211     OrderAccess::fence();
6212     return;
6213   }
6214 
6215 #ifdef ASSERT
6216   // Don't catch signals while blocked; let the running threads have the signals.
6217   // (This allows a debugger to break into the running thread.)
6218   sigset_t oldsigs;
6219   sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6220   thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6221 #endif
6222 
6223   OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6224   jt->set_suspend_equivalent();
6225   // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6226 
6227   // Do this the hard way by blocking ...
6228   // See http://monaco.sfbay/detail.jsf?cr=5094058.
6229   // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6230   // Only for SPARC >= V8PlusA
6231 #if defined(__sparc) && defined(COMPILER2)
6232   if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6233 #endif
6234 
6235   if (time == 0) {
6236     status = os::Solaris::cond_wait (_cond, _mutex) ;
6237   } else {
6238     status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6239   }
6240   // Note that an untimed cond_wait() can sometimes return ETIME on older
6241   // versions of the Solaris.
6242   assert_status(status == 0 || status == EINTR ||
6243                 status == ETIME || status == ETIMEDOUT,
6244                 status, "cond_timedwait");
6245 
6246 #ifdef ASSERT
6247   thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6248 #endif
6249   _counter = 0 ;
6250   status = os::Solaris::mutex_unlock(_mutex);
6251   assert_status(status == 0, status, "mutex_unlock") ;
6252   // Paranoia to ensure our locked and lock-free paths interact
6253   // correctly with each other and Java-level accesses.
6254   OrderAccess::fence();
6255 
6256   // If externally suspended while waiting, re-suspend
6257   if (jt->handle_special_suspend_equivalent_condition()) {
6258     jt->java_suspend_self();
6259   }
6260 }
6261 
6262 void Parker::unpark() {
6263   int s, status ;
6264   status = os::Solaris::mutex_lock (_mutex) ;
6265   assert (status == 0, "invariant") ;
6266   s = _counter;
6267   _counter = 1;
6268   status = os::Solaris::mutex_unlock (_mutex) ;
6269   assert (status == 0, "invariant") ;
6270 
6271   if (s < 1) {
6272     status = os::Solaris::cond_signal (_cond) ;
6273     assert (status == 0, "invariant") ;
6274   }
6275 }
6276 
6277 extern char** environ;
6278 
6279 // Run the specified command in a separate process. Return its exit value,
6280 // or -1 on failure (e.g. can't fork a new process).
6281 // Unlike system(), this function can be called from signal handler. It
6282 // doesn't block SIGINT et al.
6283 int os::fork_and_exec(char* cmd) {
6284   char * argv[4];
6285   argv[0] = (char *)"sh";
6286   argv[1] = (char *)"-c";
6287   argv[2] = cmd;
6288   argv[3] = NULL;
6289 
6290   // fork is async-safe, fork1 is not so can't use in signal handler
6291   pid_t pid;
6292   Thread* t = ThreadLocalStorage::get_thread_slow();
6293   if (t != NULL && t->is_inside_signal_handler()) {
6294     pid = fork();
6295   } else {
6296     pid = fork1();
6297   }
6298 
6299   if (pid < 0) {
6300     // fork failed
6301     warning("fork failed: %s", strerror(errno));
6302     return -1;
6303 
6304   } else if (pid == 0) {
6305     // child process
6306 
6307     // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6308     execve("/usr/bin/sh", argv, environ);
6309 
6310     // execve failed
6311     _exit(-1);
6312 
6313   } else  {
6314     // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6315     // care about the actual exit code, for now.
6316 
6317     int status;
6318 
6319     // Wait for the child process to exit.  This returns immediately if
6320     // the child has already exited. */
6321     while (waitpid(pid, &status, 0) < 0) {
6322         switch (errno) {
6323         case ECHILD: return 0;
6324         case EINTR: break;
6325         default: return -1;
6326         }
6327     }
6328 
6329     if (WIFEXITED(status)) {
6330        // The child exited normally; get its exit code.
6331        return WEXITSTATUS(status);
6332     } else if (WIFSIGNALED(status)) {
6333        // The child exited because of a signal
6334        // The best value to return is 0x80 + signal number,
6335        // because that is what all Unix shells do, and because
6336        // it allows callers to distinguish between process exit and
6337        // process death by signal.
6338        return 0x80 + WTERMSIG(status);
6339     } else {
6340        // Unknown exit code; pass it through
6341        return status;
6342     }
6343   }
6344 }
6345 
6346 // is_headless_jre()
6347 //
6348 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6349 // in order to report if we are running in a headless jre
6350 //
6351 // Since JDK8 xawt/libmawt.so was moved into the same directory
6352 // as libawt.so, and renamed libawt_xawt.so
6353 //
6354 bool os::is_headless_jre() {
6355     struct stat statbuf;
6356     char buf[MAXPATHLEN];
6357     char libmawtpath[MAXPATHLEN];
6358     const char *xawtstr  = "/xawt/libmawt.so";
6359     const char *new_xawtstr = "/libawt_xawt.so";
6360     char *p;
6361 
6362     // Get path to libjvm.so
6363     os::jvm_path(buf, sizeof(buf));
6364 
6365     // Get rid of libjvm.so
6366     p = strrchr(buf, '/');
6367     if (p == NULL) return false;
6368     else *p = '\0';
6369 
6370     // Get rid of client or server
6371     p = strrchr(buf, '/');
6372     if (p == NULL) return false;
6373     else *p = '\0';
6374 
6375     // check xawt/libmawt.so
6376     strcpy(libmawtpath, buf);
6377     strcat(libmawtpath, xawtstr);
6378     if (::stat(libmawtpath, &statbuf) == 0) return false;
6379 
6380     // check libawt_xawt.so
6381     strcpy(libmawtpath, buf);
6382     strcat(libmawtpath, new_xawtstr);
6383     if (::stat(libmawtpath, &statbuf) == 0) return false;
6384 
6385     return true;
6386 }
6387 
6388 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6389   INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6390 }
6391 
6392 int os::close(int fd) {
6393   RESTARTABLE_RETURN_INT(::close(fd));
6394 }
6395 
6396 int os::socket_close(int fd) {
6397   RESTARTABLE_RETURN_INT(::close(fd));
6398 }
6399 
6400 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6401   INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6402 }
6403 
6404 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6405   INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6406 }
6407 
6408 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6409   RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6410 }
6411 
6412 // As both poll and select can be interrupted by signals, we have to be
6413 // prepared to restart the system call after updating the timeout, unless
6414 // a poll() is done with timeout == -1, in which case we repeat with this
6415 // "wait forever" value.
6416 
6417 int os::timeout(int fd, long timeout) {
6418   int res;
6419   struct timeval t;
6420   julong prevtime, newtime;
6421   static const char* aNull = 0;
6422   struct pollfd pfd;
6423   pfd.fd = fd;
6424   pfd.events = POLLIN;
6425 
6426   gettimeofday(&t, &aNull);
6427   prevtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
6428 
6429   for(;;) {
6430     INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6431     if(res == OS_ERR && errno == EINTR) {
6432         if(timeout != -1) {
6433           gettimeofday(&t, &aNull);
6434           newtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec /1000;
6435           timeout -= newtime - prevtime;
6436           if(timeout <= 0)
6437             return OS_OK;
6438           prevtime = newtime;
6439         }
6440     } else return res;
6441   }
6442 }
6443 
6444 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6445   int _result;
6446   INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6447                           os::Solaris::clear_interrupted);
6448 
6449   // Depending on when thread interruption is reset, _result could be
6450   // one of two values when errno == EINTR
6451 
6452   if (((_result == OS_INTRPT) || (_result == OS_ERR))
6453       && (errno == EINTR)) {
6454      /* restarting a connect() changes its errno semantics */
6455      INTERRUPTIBLE(::connect(fd, him, len), _result,\
6456                    os::Solaris::clear_interrupted);
6457      /* undo these changes */
6458      if (_result == OS_ERR) {
6459        if (errno == EALREADY) {
6460          errno = EINPROGRESS; /* fall through */
6461        } else if (errno == EISCONN) {
6462          errno = 0;
6463          return OS_OK;
6464        }
6465      }
6466    }
6467    return _result;
6468  }
6469 
6470 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6471   if (fd < 0) {
6472     return OS_ERR;
6473   }
6474   INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6475                            os::Solaris::clear_interrupted);
6476 }
6477 
6478 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6479                  sockaddr* from, socklen_t* fromlen) {
6480   INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6481                            os::Solaris::clear_interrupted);
6482 }
6483 
6484 int os::sendto(int fd, char* buf, size_t len, uint flags,
6485                struct sockaddr* to, socklen_t tolen) {
6486   INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6487                            os::Solaris::clear_interrupted);
6488 }
6489 
6490 int os::socket_available(int fd, jint *pbytes) {
6491   if (fd < 0) {
6492     return OS_OK;
6493   }
6494   int ret;
6495   RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6496   // note: ioctl can return 0 when successful, JVM_SocketAvailable
6497   // is expected to return 0 on failure and 1 on success to the jdk.
6498   return (ret == OS_ERR) ? 0 : 1;
6499 }
6500 
6501 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6502    INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6503                                       os::Solaris::clear_interrupted);
6504 }
6505 
6506 // Get the default path to the core file
6507 // Returns the length of the string
6508 int os::get_core_path(char* buffer, size_t bufferSize) {
6509   const char* p = get_current_directory(buffer, bufferSize);
6510 
6511   if (p == NULL) {
6512     assert(p != NULL, "failed to get current directory");
6513     return 0;
6514   }
6515 
6516   return strlen(buffer);
6517 }