1 /*
   2  * Copyright (c) 1997, 2019, 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 "jvm.h"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/systemDictionary.hpp"
  29 #include "classfile/vmSymbols.hpp"
  30 #include "code/icBuffer.hpp"
  31 #include "code/vtableStubs.hpp"
  32 #include "compiler/compileBroker.hpp"
  33 #include "compiler/disassembler.hpp"
  34 #include "interpreter/interpreter.hpp"
  35 #include "logging/log.hpp"
  36 #include "logging/logStream.hpp"
  37 #include "memory/allocation.inline.hpp"
  38 #include "memory/filemap.hpp"
  39 #include "memory/universe.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "os_share_solaris.hpp"
  42 #include "os_solaris.inline.hpp"
  43 #include "prims/jniFastGetField.hpp"
  44 #include "prims/jvm_misc.hpp"
  45 #include "runtime/arguments.hpp"
  46 #include "runtime/atomic.hpp"
  47 #include "runtime/extendedPC.hpp"
  48 #include "runtime/globals.hpp"
  49 #include "runtime/interfaceSupport.inline.hpp"
  50 #include "runtime/java.hpp"
  51 #include "runtime/javaCalls.hpp"
  52 #include "runtime/mutexLocker.hpp"
  53 #include "runtime/objectMonitor.hpp"
  54 #include "runtime/orderAccess.hpp"
  55 #include "runtime/osThread.hpp"
  56 #include "runtime/perfMemory.hpp"
  57 #include "runtime/sharedRuntime.hpp"
  58 #include "runtime/statSampler.hpp"
  59 #include "runtime/stubRoutines.hpp"
  60 #include "runtime/thread.inline.hpp"
  61 #include "runtime/threadCritical.hpp"
  62 #include "runtime/timer.hpp"
  63 #include "runtime/vm_version.hpp"
  64 #include "semaphore_posix.hpp"
  65 #include "services/attachListener.hpp"
  66 #include "services/memTracker.hpp"
  67 #include "services/runtimeService.hpp"
  68 #include "utilities/align.hpp"
  69 #include "utilities/decoder.hpp"
  70 #include "utilities/defaultStream.hpp"
  71 #include "utilities/events.hpp"
  72 #include "utilities/growableArray.hpp"
  73 #include "utilities/macros.hpp"
  74 #include "utilities/vmError.hpp"
  75 
  76 // put OS-includes here
  77 # include <dlfcn.h>
  78 # include <errno.h>
  79 # include <exception>
  80 # include <link.h>
  81 # include <poll.h>
  82 # include <pthread.h>
  83 # include <setjmp.h>
  84 # include <signal.h>
  85 # include <stdio.h>
  86 # include <alloca.h>
  87 # include <sys/filio.h>
  88 # include <sys/ipc.h>
  89 # include <sys/lwp.h>
  90 # include <sys/machelf.h>     // for elf Sym structure used by dladdr1
  91 # include <sys/mman.h>
  92 # include <sys/processor.h>
  93 # include <sys/procset.h>
  94 # include <sys/pset.h>
  95 # include <sys/resource.h>
  96 # include <sys/shm.h>
  97 # include <sys/socket.h>
  98 # include <sys/stat.h>
  99 # include <sys/systeminfo.h>
 100 # include <sys/time.h>
 101 # include <sys/times.h>
 102 # include <sys/types.h>
 103 # include <sys/wait.h>
 104 # include <sys/utsname.h>
 105 # include <thread.h>
 106 # include <unistd.h>
 107 # include <sys/priocntl.h>
 108 # include <sys/rtpriocntl.h>
 109 # include <sys/tspriocntl.h>
 110 # include <sys/iapriocntl.h>
 111 # include <sys/fxpriocntl.h>
 112 # include <sys/loadavg.h>
 113 # include <string.h>
 114 # include <stdio.h>
 115 
 116 # define _STRUCTURED_PROC 1  //  this gets us the new structured proc interfaces of 5.6 & later
 117 # include <sys/procfs.h>     //  see comment in <sys/procfs.h>
 118 
 119 #define MAX_PATH (2 * K)
 120 
 121 // for timer info max values which include all bits
 122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
 123 
 124 
 125 // Here are some liblgrp types from sys/lgrp_user.h to be able to
 126 // compile on older systems without this header file.
 127 
 128 #ifndef MADV_ACCESS_LWP
 129   #define  MADV_ACCESS_LWP   7       /* next LWP to access heavily */
 130 #endif
 131 #ifndef MADV_ACCESS_MANY
 132   #define  MADV_ACCESS_MANY  8       /* many processes to access heavily */
 133 #endif
 134 
 135 #ifndef LGRP_RSRC_CPU
 136   #define LGRP_RSRC_CPU      0       /* CPU resources */
 137 #endif
 138 #ifndef LGRP_RSRC_MEM
 139   #define LGRP_RSRC_MEM      1       /* memory resources */
 140 #endif
 141 
 142 // Values for ThreadPriorityPolicy == 1
 143 int prio_policy1[CriticalPriority+1] = {
 144   -99999,  0, 16,  32,  48,  64,
 145           80, 96, 112, 124, 127, 127 };
 146 
 147 // System parameters used internally
 148 static clock_t clock_tics_per_sec = 100;
 149 
 150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
 151 static bool enabled_extended_FILE_stdio = false;
 152 
 153 // For diagnostics to print a message once. see run_periodic_checks
 154 static bool check_addr0_done = false;
 155 static sigset_t check_signal_done;
 156 static bool check_signals = true;
 157 
 158 address os::Solaris::handler_start;  // start pc of thr_sighndlrinfo
 159 address os::Solaris::handler_end;    // end pc of thr_sighndlrinfo
 160 
 161 address os::Solaris::_main_stack_base = NULL;  // 4352906 workaround
 162 
 163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
 164 
 165 // "default" initializers for missing libc APIs
 166 extern "C" {
 167   static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
 168   static int lwp_mutex_destroy(mutex_t *mx)                 { return 0; }
 169 
 170   static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
 171   static int lwp_cond_destroy(cond_t *cv)                   { return 0; }
 172 }
 173 
 174 // "default" initializers for pthread-based synchronization
 175 extern "C" {
 176   static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
 177   static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
 178 }
 179 
 180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
 181 
 182 static inline size_t adjust_stack_size(address base, size_t size) {
 183   if ((ssize_t)size < 0) {
 184     // 4759953: Compensate for ridiculous stack size.
 185     size = max_intx;
 186   }
 187   if (size > (size_t)base) {
 188     // 4812466: Make sure size doesn't allow the stack to wrap the address space.
 189     size = (size_t)base;
 190   }
 191   return size;
 192 }
 193 
 194 static inline stack_t get_stack_info() {
 195   stack_t st;
 196   int retval = thr_stksegment(&st);
 197   st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
 198   assert(retval == 0, "incorrect return value from thr_stksegment");
 199   assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
 200   assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
 201   return st;
 202 }
 203 
 204 static void _handle_uncaught_cxx_exception() {
 205   VMError::report_and_die("An uncaught C++ exception");
 206 }
 207 
 208 bool os::is_primordial_thread(void) {
 209   int r = thr_main();
 210   guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
 211   return r == 1;
 212 }
 213 
 214 address os::current_stack_base() {
 215   bool _is_primordial_thread = is_primordial_thread();
 216 
 217   // Workaround 4352906, avoid calls to thr_stksegment by
 218   // thr_main after the first one (it looks like we trash
 219   // some data, causing the value for ss_sp to be incorrect).
 220   if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
 221     stack_t st = get_stack_info();
 222     if (_is_primordial_thread) {
 223       // cache initial value of stack base
 224       os::Solaris::_main_stack_base = (address)st.ss_sp;
 225     }
 226     return (address)st.ss_sp;
 227   } else {
 228     guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
 229     return os::Solaris::_main_stack_base;
 230   }
 231 }
 232 
 233 size_t os::current_stack_size() {
 234   size_t size;
 235 
 236   if (!is_primordial_thread()) {
 237     size = get_stack_info().ss_size;
 238   } else {
 239     struct rlimit limits;
 240     getrlimit(RLIMIT_STACK, &limits);
 241     size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
 242   }
 243   // base may not be page aligned
 244   address base = current_stack_base();
 245   address bottom = align_up(base - size, os::vm_page_size());;
 246   return (size_t)(base - bottom);
 247 }
 248 
 249 struct tm* os::localtime_pd(const time_t* clock, struct tm*  res) {
 250   return localtime_r(clock, res);
 251 }
 252 
 253 void os::Solaris::try_enable_extended_io() {
 254   typedef int (*enable_extended_FILE_stdio_t)(int, int);
 255 
 256   if (!UseExtendedFileIO) {
 257     return;
 258   }
 259 
 260   enable_extended_FILE_stdio_t enabler =
 261     (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
 262                                          "enable_extended_FILE_stdio");
 263   if (enabler) {
 264     enabler(-1, -1);
 265   }
 266 }
 267 
 268 static int _processors_online = 0;
 269 
 270 jint os::Solaris::_os_thread_limit = 0;
 271 volatile jint os::Solaris::_os_thread_count = 0;
 272 
 273 julong os::available_memory() {
 274   return Solaris::available_memory();
 275 }
 276 
 277 julong os::Solaris::available_memory() {
 278   return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
 279 }
 280 
 281 julong os::Solaris::_physical_memory = 0;
 282 
 283 julong os::physical_memory() {
 284   return Solaris::physical_memory();
 285 }
 286 
 287 static hrtime_t first_hrtime = 0;
 288 static const hrtime_t hrtime_hz = 1000*1000*1000;
 289 static volatile hrtime_t max_hrtime = 0;
 290 
 291 
 292 void os::Solaris::initialize_system_info() {
 293   set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
 294   _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
 295   _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
 296                                      (julong)sysconf(_SC_PAGESIZE);
 297 }
 298 
 299 uint os::processor_id() {
 300   const processorid_t id = ::getcpuid();
 301   assert(id >= 0 && id < _processor_count, "Invalid processor id");
 302   return (uint)id;
 303 }
 304 
 305 int os::active_processor_count() {
 306   // User has overridden the number of active processors
 307   if (ActiveProcessorCount > 0) {
 308     log_trace(os)("active_processor_count: "
 309                   "active processor count set by user : %d",
 310                   ActiveProcessorCount);
 311     return ActiveProcessorCount;
 312   }
 313 
 314   int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
 315   pid_t pid = getpid();
 316   psetid_t pset = PS_NONE;
 317   // Are we running in a processor set or is there any processor set around?
 318   if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
 319     uint_t pset_cpus;
 320     // Query the number of cpus available to us.
 321     if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
 322       assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
 323       _processors_online = pset_cpus;
 324       return pset_cpus;
 325     }
 326   }
 327   // Otherwise return number of online cpus
 328   return online_cpus;
 329 }
 330 
 331 static bool find_processors_in_pset(psetid_t        pset,
 332                                     processorid_t** id_array,
 333                                     uint_t*         id_length) {
 334   bool result = false;
 335   // Find the number of processors in the processor set.
 336   if (pset_info(pset, NULL, id_length, NULL) == 0) {
 337     // Make up an array to hold their ids.
 338     *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
 339     // Fill in the array with their processor ids.
 340     if (pset_info(pset, NULL, id_length, *id_array) == 0) {
 341       result = true;
 342     }
 343   }
 344   return result;
 345 }
 346 
 347 // Callers of find_processors_online() must tolerate imprecise results --
 348 // the system configuration can change asynchronously because of DR
 349 // or explicit psradm operations.
 350 //
 351 // We also need to take care that the loop (below) terminates as the
 352 // number of processors online can change between the _SC_NPROCESSORS_ONLN
 353 // request and the loop that builds the list of processor ids.   Unfortunately
 354 // there's no reliable way to determine the maximum valid processor id,
 355 // so we use a manifest constant, MAX_PROCESSOR_ID, instead.  See p_online
 356 // man pages, which claim the processor id set is "sparse, but
 357 // not too sparse".  MAX_PROCESSOR_ID is used to ensure that we eventually
 358 // exit the loop.
 359 //
 360 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
 361 // not available on S8.0.
 362 
 363 static bool find_processors_online(processorid_t** id_array,
 364                                    uint*           id_length) {
 365   const processorid_t MAX_PROCESSOR_ID = 100000;
 366   // Find the number of processors online.
 367   *id_length = sysconf(_SC_NPROCESSORS_ONLN);
 368   // Make up an array to hold their ids.
 369   *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
 370   // Processors need not be numbered consecutively.
 371   long found = 0;
 372   processorid_t next = 0;
 373   while (found < *id_length && next < MAX_PROCESSOR_ID) {
 374     processor_info_t info;
 375     if (processor_info(next, &info) == 0) {
 376       // NB, PI_NOINTR processors are effectively online ...
 377       if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
 378         (*id_array)[found] = next;
 379         found += 1;
 380       }
 381     }
 382     next += 1;
 383   }
 384   if (found < *id_length) {
 385     // The loop above didn't identify the expected number of processors.
 386     // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
 387     // and re-running the loop, above, but there's no guarantee of progress
 388     // if the system configuration is in flux.  Instead, we just return what
 389     // we've got.  Note that in the worst case find_processors_online() could
 390     // return an empty set.  (As a fall-back in the case of the empty set we
 391     // could just return the ID of the current processor).
 392     *id_length = found;
 393   }
 394 
 395   return true;
 396 }
 397 
 398 static bool assign_distribution(processorid_t* id_array,
 399                                 uint           id_length,
 400                                 uint*          distribution,
 401                                 uint           distribution_length) {
 402   // We assume we can assign processorid_t's to uint's.
 403   assert(sizeof(processorid_t) == sizeof(uint),
 404          "can't convert processorid_t to uint");
 405   // Quick check to see if we won't succeed.
 406   if (id_length < distribution_length) {
 407     return false;
 408   }
 409   // Assign processor ids to the distribution.
 410   // Try to shuffle processors to distribute work across boards,
 411   // assuming 4 processors per board.
 412   const uint processors_per_board = ProcessDistributionStride;
 413   // Find the maximum processor id.
 414   processorid_t max_id = 0;
 415   for (uint m = 0; m < id_length; m += 1) {
 416     max_id = MAX2(max_id, id_array[m]);
 417   }
 418   // The next id, to limit loops.
 419   const processorid_t limit_id = max_id + 1;
 420   // Make up markers for available processors.
 421   bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
 422   for (uint c = 0; c < limit_id; c += 1) {
 423     available_id[c] = false;
 424   }
 425   for (uint a = 0; a < id_length; a += 1) {
 426     available_id[id_array[a]] = true;
 427   }
 428   // Step by "boards", then by "slot", copying to "assigned".
 429   // NEEDS_CLEANUP: The assignment of processors should be stateful,
 430   //                remembering which processors have been assigned by
 431   //                previous calls, etc., so as to distribute several
 432   //                independent calls of this method.  What we'd like is
 433   //                It would be nice to have an API that let us ask
 434   //                how many processes are bound to a processor,
 435   //                but we don't have that, either.
 436   //                In the short term, "board" is static so that
 437   //                subsequent distributions don't all start at board 0.
 438   static uint board = 0;
 439   uint assigned = 0;
 440   // Until we've found enough processors ....
 441   while (assigned < distribution_length) {
 442     // ... find the next available processor in the board.
 443     for (uint slot = 0; slot < processors_per_board; slot += 1) {
 444       uint try_id = board * processors_per_board + slot;
 445       if ((try_id < limit_id) && (available_id[try_id] == true)) {
 446         distribution[assigned] = try_id;
 447         available_id[try_id] = false;
 448         assigned += 1;
 449         break;
 450       }
 451     }
 452     board += 1;
 453     if (board * processors_per_board + 0 >= limit_id) {
 454       board = 0;
 455     }
 456   }
 457   FREE_C_HEAP_ARRAY(bool, available_id);
 458   return true;
 459 }
 460 
 461 void os::set_native_thread_name(const char *name) {
 462   if (Solaris::_pthread_setname_np != NULL) {
 463     // Only the first 31 bytes of 'name' are processed by pthread_setname_np
 464     // but we explicitly copy into a size-limited buffer to avoid any
 465     // possible overflow.
 466     char buf[32];
 467     snprintf(buf, sizeof(buf), "%s", name);
 468     buf[sizeof(buf) - 1] = '\0';
 469     Solaris::_pthread_setname_np(pthread_self(), buf);
 470   }
 471 }
 472 
 473 bool os::distribute_processes(uint length, uint* distribution) {
 474   bool result = false;
 475   // Find the processor id's of all the available CPUs.
 476   processorid_t* id_array  = NULL;
 477   uint           id_length = 0;
 478   // There are some races between querying information and using it,
 479   // since processor sets can change dynamically.
 480   psetid_t pset = PS_NONE;
 481   // Are we running in a processor set?
 482   if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
 483     result = find_processors_in_pset(pset, &id_array, &id_length);
 484   } else {
 485     result = find_processors_online(&id_array, &id_length);
 486   }
 487   if (result == true) {
 488     if (id_length >= length) {
 489       result = assign_distribution(id_array, id_length, distribution, length);
 490     } else {
 491       result = false;
 492     }
 493   }
 494   FREE_C_HEAP_ARRAY(processorid_t, id_array);
 495   return result;
 496 }
 497 
 498 bool os::bind_to_processor(uint processor_id) {
 499   // We assume that a processorid_t can be stored in a uint.
 500   assert(sizeof(uint) == sizeof(processorid_t),
 501          "can't convert uint to processorid_t");
 502   int bind_result =
 503     processor_bind(P_LWPID,                       // bind LWP.
 504                    P_MYID,                        // bind current LWP.
 505                    (processorid_t) processor_id,  // id.
 506                    NULL);                         // don't return old binding.
 507   return (bind_result == 0);
 508 }
 509 
 510 // Return true if user is running as root.
 511 
 512 bool os::have_special_privileges() {
 513   static bool init = false;
 514   static bool privileges = false;
 515   if (!init) {
 516     privileges = (getuid() != geteuid()) || (getgid() != getegid());
 517     init = true;
 518   }
 519   return privileges;
 520 }
 521 
 522 
 523 void os::init_system_properties_values() {
 524   // The next steps are taken in the product version:
 525   //
 526   // Obtain the JAVA_HOME value from the location of libjvm.so.
 527   // This library should be located at:
 528   // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
 529   //
 530   // If "/jre/lib/" appears at the right place in the path, then we
 531   // assume libjvm.so is installed in a JDK and we use this path.
 532   //
 533   // Otherwise exit with message: "Could not create the Java virtual machine."
 534   //
 535   // The following extra steps are taken in the debugging version:
 536   //
 537   // If "/jre/lib/" does NOT appear at the right place in the path
 538   // instead of exit check for $JAVA_HOME environment variable.
 539   //
 540   // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
 541   // then we append a fake suffix "hotspot/libjvm.so" to this path so
 542   // it looks like libjvm.so is installed there
 543   // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
 544   //
 545   // Otherwise exit.
 546   //
 547   // Important note: if the location of libjvm.so changes this
 548   // code needs to be changed accordingly.
 549 
 550 // Base path of extensions installed on the system.
 551 #define SYS_EXT_DIR     "/usr/jdk/packages"
 552 #define EXTENSIONS_DIR  "/lib/ext"
 553 
 554   // Buffer that fits several sprintfs.
 555   // Note that the space for the colon and the trailing null are provided
 556   // by the nulls included by the sizeof operator.
 557   const size_t bufsize =
 558     MAX3((size_t)MAXPATHLEN,  // For dll_dir & friends.
 559          sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
 560          (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
 561   char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
 562 
 563   // sysclasspath, java_home, dll_dir
 564   {
 565     char *pslash;
 566     os::jvm_path(buf, bufsize);
 567 
 568     // Found the full path to libjvm.so.
 569     // Now cut the path to <java_home>/jre if we can.
 570     *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
 571     pslash = strrchr(buf, '/');
 572     if (pslash != NULL) {
 573       *pslash = '\0';            // Get rid of /{client|server|hotspot}.
 574     }
 575     Arguments::set_dll_dir(buf);
 576 
 577     if (pslash != NULL) {
 578       pslash = strrchr(buf, '/');
 579       if (pslash != NULL) {
 580         *pslash = '\0';        // Get rid of /lib.
 581       }
 582     }
 583     Arguments::set_java_home(buf);
 584     if (!set_boot_path('/', ':')) {
 585       vm_exit_during_initialization("Failed setting boot class path.", NULL);
 586     }
 587   }
 588 
 589   // Where to look for native libraries.
 590   {
 591     // Use dlinfo() to determine the correct java.library.path.
 592     //
 593     // If we're launched by the Java launcher, and the user
 594     // does not set java.library.path explicitly on the commandline,
 595     // the Java launcher sets LD_LIBRARY_PATH for us and unsets
 596     // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64.  In this case
 597     // dlinfo returns LD_LIBRARY_PATH + crle settings (including
 598     // /usr/lib), which is exactly what we want.
 599     //
 600     // If the user does set java.library.path, it completely
 601     // overwrites this setting, and always has.
 602     //
 603     // If we're not launched by the Java launcher, we may
 604     // get here with any/all of the LD_LIBRARY_PATH[_32|64]
 605     // settings.  Again, dlinfo does exactly what we want.
 606 
 607     Dl_serinfo     info_sz, *info = &info_sz;
 608     Dl_serpath     *path;
 609     char           *library_path;
 610     char           *common_path = buf;
 611 
 612     // Determine search path count and required buffer size.
 613     if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
 614       FREE_C_HEAP_ARRAY(char, buf);
 615       vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
 616     }
 617 
 618     // Allocate new buffer and initialize.
 619     info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
 620     info->dls_size = info_sz.dls_size;
 621     info->dls_cnt = info_sz.dls_cnt;
 622 
 623     // Obtain search path information.
 624     if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
 625       FREE_C_HEAP_ARRAY(char, buf);
 626       FREE_C_HEAP_ARRAY(char, info);
 627       vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
 628     }
 629 
 630     path = &info->dls_serpath[0];
 631 
 632     // Note: Due to a legacy implementation, most of the library path
 633     // is set in the launcher. This was to accomodate linking restrictions
 634     // on legacy Solaris implementations (which are no longer supported).
 635     // Eventually, all the library path setting will be done here.
 636     //
 637     // However, to prevent the proliferation of improperly built native
 638     // libraries, the new path component /usr/jdk/packages is added here.
 639 
 640     // Construct the invariant part of ld_library_path.
 641     sprintf(common_path, SYS_EXT_DIR "/lib");
 642 
 643     // Struct size is more than sufficient for the path components obtained
 644     // through the dlinfo() call, so only add additional space for the path
 645     // components explicitly added here.
 646     size_t library_path_size = info->dls_size + strlen(common_path);
 647     library_path = NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
 648     library_path[0] = '\0';
 649 
 650     // Construct the desired Java library path from the linker's library
 651     // search path.
 652     //
 653     // For compatibility, it is optimal that we insert the additional path
 654     // components specific to the Java VM after those components specified
 655     // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
 656     // infrastructure.
 657     if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
 658       strcpy(library_path, common_path);
 659     } else {
 660       int inserted = 0;
 661       int i;
 662       for (i = 0; i < info->dls_cnt; i++, path++) {
 663         uint_t flags = path->dls_flags & LA_SER_MASK;
 664         if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
 665           strcat(library_path, common_path);
 666           strcat(library_path, os::path_separator());
 667           inserted = 1;
 668         }
 669         strcat(library_path, path->dls_name);
 670         strcat(library_path, os::path_separator());
 671       }
 672       // Eliminate trailing path separator.
 673       library_path[strlen(library_path)-1] = '\0';
 674     }
 675 
 676     // happens before argument parsing - can't use a trace flag
 677     // tty->print_raw("init_system_properties_values: native lib path: ");
 678     // tty->print_raw_cr(library_path);
 679 
 680     // Callee copies into its own buffer.
 681     Arguments::set_library_path(library_path);
 682 
 683     FREE_C_HEAP_ARRAY(char, library_path);
 684     FREE_C_HEAP_ARRAY(char, info);
 685   }
 686 
 687   // Extensions directories.
 688   sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
 689   Arguments::set_ext_dirs(buf);
 690 
 691   FREE_C_HEAP_ARRAY(char, buf);
 692 
 693 #undef SYS_EXT_DIR
 694 #undef EXTENSIONS_DIR
 695 }
 696 
 697 void os::breakpoint() {
 698   BREAKPOINT;
 699 }
 700 
 701 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
 702   address  stackStart  = (address)thread->stack_base();
 703   address  stackEnd    = (address)(stackStart - (address)thread->stack_size());
 704   if (sp < stackStart && sp >= stackEnd) return true;
 705   return false;
 706 }
 707 
 708 extern "C" void breakpoint() {
 709   // use debugger to set breakpoint here
 710 }
 711 
 712 static thread_t main_thread;
 713 
 714 // Thread start routine for all newly created threads
 715 extern "C" void* thread_native_entry(void* thread_addr) {
 716 
 717   Thread* thread = (Thread*)thread_addr;
 718 
 719   thread->record_stack_base_and_size();
 720 
 721   // Try to randomize the cache line index of hot stack frames.
 722   // This helps when threads of the same stack traces evict each other's
 723   // cache lines. The threads can be either from the same JVM instance, or
 724   // from different JVM instances. The benefit is especially true for
 725   // processors with hyperthreading technology.
 726   static int counter = 0;
 727   int pid = os::current_process_id();
 728   alloca(((pid ^ counter++) & 7) * 128);
 729 
 730   int prio;
 731 
 732   thread->initialize_thread_current();
 733 
 734   OSThread* osthr = thread->osthread();
 735 
 736   osthr->set_lwp_id(_lwp_self());  // Store lwp in case we are bound
 737 
 738   log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
 739     os::current_thread_id());
 740 
 741   if (UseNUMA) {
 742     int lgrp_id = os::numa_get_group_id();
 743     if (lgrp_id != -1) {
 744       thread->set_lgrp_id(lgrp_id);
 745     }
 746   }
 747 
 748   // Our priority was set when we were created, and stored in the
 749   // osthread, but couldn't be passed through to our LWP until now.
 750   // So read back the priority and set it again.
 751 
 752   if (osthr->thread_id() != -1) {
 753     if (UseThreadPriorities) {
 754       int prio = osthr->native_priority();
 755       if (ThreadPriorityVerbose) {
 756         tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
 757                       INTPTR_FORMAT ", setting priority: %d\n",
 758                       osthr->thread_id(), osthr->lwp_id(), prio);
 759       }
 760       os::set_native_priority(thread, prio);
 761     }
 762   } else if (ThreadPriorityVerbose) {
 763     warning("Can't set priority in _start routine, thread id hasn't been set\n");
 764   }
 765 
 766   assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
 767 
 768   // initialize signal mask for this thread
 769   os::Solaris::hotspot_sigmask(thread);
 770 
 771   os::Solaris::init_thread_fpu_state();
 772   std::set_terminate(_handle_uncaught_cxx_exception);
 773 
 774   thread->call_run();
 775 
 776   // Note: at this point the thread object may already have deleted itself.
 777   // Do not dereference it from here on out.
 778 
 779   // One less thread is executing
 780   // When the VMThread gets here, the main thread may have already exited
 781   // which frees the CodeHeap containing the Atomic::dec code
 782   if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
 783     Atomic::dec(&os::Solaris::_os_thread_count);
 784   }
 785 
 786   log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
 787 
 788   if (UseDetachedThreads) {
 789     thr_exit(NULL);
 790     ShouldNotReachHere();
 791   }
 792   return NULL;
 793 }
 794 
 795 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
 796   // Allocate the OSThread object
 797   OSThread* osthread = new OSThread(NULL, NULL);
 798   if (osthread == NULL) return NULL;
 799 
 800   // Store info on the Solaris thread into the OSThread
 801   osthread->set_thread_id(thread_id);
 802   osthread->set_lwp_id(_lwp_self());
 803 
 804   if (UseNUMA) {
 805     int lgrp_id = os::numa_get_group_id();
 806     if (lgrp_id != -1) {
 807       thread->set_lgrp_id(lgrp_id);
 808     }
 809   }
 810 
 811   if (ThreadPriorityVerbose) {
 812     tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
 813                   osthread->thread_id(), osthread->lwp_id());
 814   }
 815 
 816   // Initial thread state is INITIALIZED, not SUSPENDED
 817   osthread->set_state(INITIALIZED);
 818 
 819   return osthread;
 820 }
 821 
 822 void os::Solaris::hotspot_sigmask(Thread* thread) {
 823   //Save caller's signal mask
 824   sigset_t sigmask;
 825   pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
 826   OSThread *osthread = thread->osthread();
 827   osthread->set_caller_sigmask(sigmask);
 828 
 829   pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
 830   if (!ReduceSignalUsage) {
 831     if (thread->is_VM_thread()) {
 832       // Only the VM thread handles BREAK_SIGNAL ...
 833       pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
 834     } else {
 835       // ... all other threads block BREAK_SIGNAL
 836       assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
 837       pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
 838     }
 839   }
 840 }
 841 
 842 bool os::create_attached_thread(JavaThread* thread) {
 843 #ifdef ASSERT
 844   thread->verify_not_published();
 845 #endif
 846   OSThread* osthread = create_os_thread(thread, thr_self());
 847   if (osthread == NULL) {
 848     return false;
 849   }
 850 
 851   // Initial thread state is RUNNABLE
 852   osthread->set_state(RUNNABLE);
 853   thread->set_osthread(osthread);
 854 
 855   // initialize signal mask for this thread
 856   // and save the caller's signal mask
 857   os::Solaris::hotspot_sigmask(thread);
 858 
 859   log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
 860     os::current_thread_id());
 861 
 862   return true;
 863 }
 864 
 865 bool os::create_main_thread(JavaThread* thread) {
 866 #ifdef ASSERT
 867   thread->verify_not_published();
 868 #endif
 869   if (_starting_thread == NULL) {
 870     _starting_thread = create_os_thread(thread, main_thread);
 871     if (_starting_thread == NULL) {
 872       return false;
 873     }
 874   }
 875 
 876   // The primodial thread is runnable from the start
 877   _starting_thread->set_state(RUNNABLE);
 878 
 879   thread->set_osthread(_starting_thread);
 880 
 881   // initialize signal mask for this thread
 882   // and save the caller's signal mask
 883   os::Solaris::hotspot_sigmask(thread);
 884 
 885   return true;
 886 }
 887 
 888 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
 889 static char* describe_thr_create_attributes(char* buf, size_t buflen,
 890                                             size_t stacksize, long flags) {
 891   stringStream ss(buf, buflen);
 892   ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
 893   ss.print("flags: ");
 894   #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
 895   #define ALL(X) \
 896     X(THR_SUSPENDED) \
 897     X(THR_DETACHED) \
 898     X(THR_BOUND) \
 899     X(THR_NEW_LWP) \
 900     X(THR_DAEMON)
 901   ALL(PRINT_FLAG)
 902   #undef ALL
 903   #undef PRINT_FLAG
 904   return buf;
 905 }
 906 
 907 // return default stack size for thr_type
 908 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
 909   // default stack size when not specified by caller is 1M (2M for LP64)
 910   size_t s = (BytesPerWord >> 2) * K * K;
 911   return s;
 912 }
 913 
 914 bool os::create_thread(Thread* thread, ThreadType thr_type,
 915                        size_t req_stack_size) {
 916   // Allocate the OSThread object
 917   OSThread* osthread = new OSThread(NULL, NULL);
 918   if (osthread == NULL) {
 919     return false;
 920   }
 921 
 922   if (ThreadPriorityVerbose) {
 923     char *thrtyp;
 924     switch (thr_type) {
 925     case vm_thread:
 926       thrtyp = (char *)"vm";
 927       break;
 928     case cgc_thread:
 929       thrtyp = (char *)"cgc";
 930       break;
 931     case pgc_thread:
 932       thrtyp = (char *)"pgc";
 933       break;
 934     case java_thread:
 935       thrtyp = (char *)"java";
 936       break;
 937     case compiler_thread:
 938       thrtyp = (char *)"compiler";
 939       break;
 940     case watcher_thread:
 941       thrtyp = (char *)"watcher";
 942       break;
 943     default:
 944       thrtyp = (char *)"unknown";
 945       break;
 946     }
 947     tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
 948   }
 949 
 950   // calculate stack size if it's not specified by caller
 951   size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
 952 
 953   // Initial state is ALLOCATED but not INITIALIZED
 954   osthread->set_state(ALLOCATED);
 955 
 956   if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
 957     // We got lots of threads. Check if we still have some address space left.
 958     // Need to be at least 5Mb of unreserved address space. We do check by
 959     // trying to reserve some.
 960     const size_t VirtualMemoryBangSize = 20*K*K;
 961     char* mem = os::reserve_memory(VirtualMemoryBangSize);
 962     if (mem == NULL) {
 963       delete osthread;
 964       return false;
 965     } else {
 966       // Release the memory again
 967       os::release_memory(mem, VirtualMemoryBangSize);
 968     }
 969   }
 970 
 971   // Setup osthread because the child thread may need it.
 972   thread->set_osthread(osthread);
 973 
 974   // Create the Solaris thread
 975   thread_t tid = 0;
 976   long     flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
 977   int      status;
 978 
 979   // Mark that we don't have an lwp or thread id yet.
 980   // In case we attempt to set the priority before the thread starts.
 981   osthread->set_lwp_id(-1);
 982   osthread->set_thread_id(-1);
 983 
 984   status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
 985 
 986   char buf[64];
 987   if (status == 0) {
 988     log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
 989       (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
 990   } else {
 991     log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
 992       os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
 993     // Log some OS information which might explain why creating the thread failed.
 994     log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
 995     LogStream st(Log(os, thread)::info());
 996     os::Posix::print_rlimit_info(&st);
 997     os::print_memory_info(&st);
 998   }
 999 
1000   if (status != 0) {
1001     thread->set_osthread(NULL);
1002     // Need to clean up stuff we've allocated so far
1003     delete osthread;
1004     return false;
1005   }
1006 
1007   Atomic::inc(&os::Solaris::_os_thread_count);
1008 
1009   // Store info on the Solaris thread into the OSThread
1010   osthread->set_thread_id(tid);
1011 
1012   // Remember that we created this thread so we can set priority on it
1013   osthread->set_vm_created();
1014 
1015   // Most thread types will set an explicit priority before starting the thread,
1016   // but for those that don't we need a valid value to read back in thread_native_entry.
1017   osthread->set_native_priority(NormPriority);
1018 
1019   // Initial thread state is INITIALIZED, not SUSPENDED
1020   osthread->set_state(INITIALIZED);
1021 
1022   // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1023   return true;
1024 }
1025 
1026 debug_only(static bool signal_sets_initialized = false);
1027 static sigset_t unblocked_sigs, vm_sigs;
1028 
1029 void os::Solaris::signal_sets_init() {
1030   // Should also have an assertion stating we are still single-threaded.
1031   assert(!signal_sets_initialized, "Already initialized");
1032   // Fill in signals that are necessarily unblocked for all threads in
1033   // the VM. Currently, we unblock the following signals:
1034   // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1035   //                         by -Xrs (=ReduceSignalUsage));
1036   // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1037   // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1038   // the dispositions or masks wrt these signals.
1039   // Programs embedding the VM that want to use the above signals for their
1040   // own purposes must, at this time, use the "-Xrs" option to prevent
1041   // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1042   // (See bug 4345157, and other related bugs).
1043   // In reality, though, unblocking these signals is really a nop, since
1044   // these signals are not blocked by default.
1045   sigemptyset(&unblocked_sigs);
1046   sigaddset(&unblocked_sigs, SIGILL);
1047   sigaddset(&unblocked_sigs, SIGSEGV);
1048   sigaddset(&unblocked_sigs, SIGBUS);
1049   sigaddset(&unblocked_sigs, SIGFPE);
1050   sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1051 
1052   if (!ReduceSignalUsage) {
1053     if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1054       sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1055     }
1056     if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1057       sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1058     }
1059     if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1060       sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1061     }
1062   }
1063   // Fill in signals that are blocked by all but the VM thread.
1064   sigemptyset(&vm_sigs);
1065   if (!ReduceSignalUsage) {
1066     sigaddset(&vm_sigs, BREAK_SIGNAL);
1067   }
1068   debug_only(signal_sets_initialized = true);
1069 
1070   // For diagnostics only used in run_periodic_checks
1071   sigemptyset(&check_signal_done);
1072 }
1073 
1074 // These are signals that are unblocked while a thread is running Java.
1075 // (For some reason, they get blocked by default.)
1076 sigset_t* os::Solaris::unblocked_signals() {
1077   assert(signal_sets_initialized, "Not initialized");
1078   return &unblocked_sigs;
1079 }
1080 
1081 // These are the signals that are blocked while a (non-VM) thread is
1082 // running Java. Only the VM thread handles these signals.
1083 sigset_t* os::Solaris::vm_signals() {
1084   assert(signal_sets_initialized, "Not initialized");
1085   return &vm_sigs;
1086 }
1087 
1088 // CR 7190089: on Solaris, primordial thread's stack needs adjusting.
1089 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited).
1090 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) {
1091   assert(is_primordial_thread(), "Call only for primordial thread");
1092 
1093   JavaThread* jt = (JavaThread *)thr;
1094   assert(jt != NULL, "Sanity check");
1095   size_t stack_size;
1096   address base = jt->stack_base();
1097   if (Arguments::created_by_java_launcher()) {
1098     // Use 2MB to allow for Solaris 7 64 bit mode.
1099     stack_size = JavaThread::stack_size_at_create() == 0
1100       ? 2048*K : JavaThread::stack_size_at_create();
1101 
1102     // There are rare cases when we may have already used more than
1103     // the basic stack size allotment before this method is invoked.
1104     // Attempt to allow for a normally sized java_stack.
1105     size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1106     stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1107   } else {
1108     // 6269555: If we were not created by a Java launcher, i.e. if we are
1109     // running embedded in a native application, treat the primordial thread
1110     // as much like a native attached thread as possible.  This means using
1111     // the current stack size from thr_stksegment(), unless it is too large
1112     // to reliably setup guard pages.  A reasonable max size is 8MB.
1113     size_t current_size = os::current_stack_size();
1114     // This should never happen, but just in case....
1115     if (current_size == 0) current_size = 2 * K * K;
1116     stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1117   }
1118   address bottom = align_up(base - stack_size, os::vm_page_size());;
1119   stack_size = (size_t)(base - bottom);
1120 
1121   assert(stack_size > 0, "Stack size calculation problem");
1122 
1123   if (stack_size > jt->stack_size()) {
1124 #ifndef PRODUCT
1125     struct rlimit limits;
1126     getrlimit(RLIMIT_STACK, &limits);
1127     size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1128     assert(size >= jt->stack_size(), "Stack size problem in main thread");
1129 #endif
1130     tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1131                   "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1132                   "See limit(1) to increase the stack size limit.",
1133                   stack_size / K, jt->stack_size() / K);
1134     vm_exit(1);
1135   }
1136   assert(jt->stack_size() >= stack_size,
1137          "Attempt to map more stack than was allocated");
1138   jt->set_stack_size(stack_size);
1139 
1140 }
1141 
1142 
1143 
1144 // Free Solaris resources related to the OSThread
1145 void os::free_thread(OSThread* osthread) {
1146   assert(osthread != NULL, "os::free_thread but osthread not set");
1147 
1148   // We are told to free resources of the argument thread,
1149   // but we can only really operate on the current thread.
1150   assert(Thread::current()->osthread() == osthread,
1151          "os::free_thread but not current thread");
1152 
1153   // Restore caller's signal mask
1154   sigset_t sigmask = osthread->caller_sigmask();
1155   pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1156 
1157   delete osthread;
1158 }
1159 
1160 void os::pd_start_thread(Thread* thread) {
1161   int status = thr_continue(thread->osthread()->thread_id());
1162   assert_status(status == 0, status, "thr_continue failed");
1163 }
1164 
1165 
1166 intx os::current_thread_id() {
1167   return (intx)thr_self();
1168 }
1169 
1170 static pid_t _initial_pid = 0;
1171 
1172 int os::current_process_id() {
1173   return (int)(_initial_pid ? _initial_pid : getpid());
1174 }
1175 
1176 // gethrtime() should be monotonic according to the documentation,
1177 // but some virtualized platforms are known to break this guarantee.
1178 // getTimeNanos() must be guaranteed not to move backwards, so we
1179 // are forced to add a check here.
1180 inline hrtime_t getTimeNanos() {
1181   const hrtime_t now = gethrtime();
1182   const hrtime_t prev = max_hrtime;
1183   if (now <= prev) {
1184     return prev;   // same or retrograde time;
1185   }
1186   const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1187   assert(obsv >= prev, "invariant");   // Monotonicity
1188   // If the CAS succeeded then we're done and return "now".
1189   // If the CAS failed and the observed value "obsv" is >= now then
1190   // we should return "obsv".  If the CAS failed and now > obsv > prv then
1191   // some other thread raced this thread and installed a new value, in which case
1192   // we could either (a) retry the entire operation, (b) retry trying to install now
1193   // or (c) just return obsv.  We use (c).   No loop is required although in some cases
1194   // we might discard a higher "now" value in deference to a slightly lower but freshly
1195   // installed obsv value.   That's entirely benign -- it admits no new orderings compared
1196   // to (a) or (b) -- and greatly reduces coherence traffic.
1197   // We might also condition (c) on the magnitude of the delta between obsv and now.
1198   // Avoiding excessive CAS operations to hot RW locations is critical.
1199   // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1200   return (prev == obsv) ? now : obsv;
1201 }
1202 
1203 // Time since start-up in seconds to a fine granularity.
1204 // Used by VMSelfDestructTimer and the MemProfiler.
1205 double os::elapsedTime() {
1206   return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1207 }
1208 
1209 jlong os::elapsed_counter() {
1210   return (jlong)(getTimeNanos() - first_hrtime);
1211 }
1212 
1213 jlong os::elapsed_frequency() {
1214   return hrtime_hz;
1215 }
1216 
1217 // Return the real, user, and system times in seconds from an
1218 // arbitrary fixed point in the past.
1219 bool os::getTimesSecs(double* process_real_time,
1220                       double* process_user_time,
1221                       double* process_system_time) {
1222   struct tms ticks;
1223   clock_t real_ticks = times(&ticks);
1224 
1225   if (real_ticks == (clock_t) (-1)) {
1226     return false;
1227   } else {
1228     double ticks_per_second = (double) clock_tics_per_sec;
1229     *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1230     *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1231     // For consistency return the real time from getTimeNanos()
1232     // converted to seconds.
1233     *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1234 
1235     return true;
1236   }
1237 }
1238 
1239 bool os::supports_vtime() { return true; }
1240 bool os::enable_vtime() { return false; }
1241 bool os::vtime_enabled() { return false; }
1242 
1243 double os::elapsedVTime() {
1244   return (double)gethrvtime() / (double)hrtime_hz;
1245 }
1246 
1247 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1248 jlong os::javaTimeMillis() {
1249   timeval t;
1250   if (gettimeofday(&t, NULL) == -1) {
1251     fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1252   }
1253   return jlong(t.tv_sec) * 1000  +  jlong(t.tv_usec) / 1000;
1254 }
1255 
1256 // Must return seconds+nanos since Jan 1 1970. This must use the same
1257 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1258 // we need better than 1ms accuracy
1259 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1260   timeval t;
1261   if (gettimeofday(&t, NULL) == -1) {
1262     fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1263   }
1264   seconds = jlong(t.tv_sec);
1265   nanos = jlong(t.tv_usec) * 1000;
1266 }
1267 
1268 
1269 jlong os::javaTimeNanos() {
1270   return (jlong)getTimeNanos();
1271 }
1272 
1273 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1274   info_ptr->max_value = ALL_64_BITS;      // gethrtime() uses all 64 bits
1275   info_ptr->may_skip_backward = false;    // not subject to resetting or drifting
1276   info_ptr->may_skip_forward = false;     // not subject to resetting or drifting
1277   info_ptr->kind = JVMTI_TIMER_ELAPSED;   // elapsed not CPU time
1278 }
1279 
1280 char * os::local_time_string(char *buf, size_t buflen) {
1281   struct tm t;
1282   time_t long_time;
1283   time(&long_time);
1284   localtime_r(&long_time, &t);
1285   jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1286                t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1287                t.tm_hour, t.tm_min, t.tm_sec);
1288   return buf;
1289 }
1290 
1291 // Note: os::shutdown() might be called very early during initialization, or
1292 // called from signal handler. Before adding something to os::shutdown(), make
1293 // sure it is async-safe and can handle partially initialized VM.
1294 void os::shutdown() {
1295 
1296   // allow PerfMemory to attempt cleanup of any persistent resources
1297   perfMemory_exit();
1298 
1299   // needs to remove object in file system
1300   AttachListener::abort();
1301 
1302   // flush buffered output, finish log files
1303   ostream_abort();
1304 
1305   // Check for abort hook
1306   abort_hook_t abort_hook = Arguments::abort_hook();
1307   if (abort_hook != NULL) {
1308     abort_hook();
1309   }
1310 }
1311 
1312 // Note: os::abort() might be called very early during initialization, or
1313 // called from signal handler. Before adding something to os::abort(), make
1314 // sure it is async-safe and can handle partially initialized VM.
1315 void os::abort(bool dump_core, void* siginfo, const void* context) {
1316   os::shutdown();
1317   if (dump_core) {
1318 #ifndef PRODUCT
1319     fdStream out(defaultStream::output_fd());
1320     out.print_raw("Current thread is ");
1321     char buf[16];
1322     jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1323     out.print_raw_cr(buf);
1324     out.print_raw_cr("Dumping core ...");
1325 #endif
1326     ::abort(); // dump core (for debugging)
1327   }
1328 
1329   ::exit(1);
1330 }
1331 
1332 // Die immediately, no exit hook, no abort hook, no cleanup.
1333 // Dump a core file, if possible, for debugging.
1334 void os::die() {
1335   if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1336     // For TimeoutInErrorHandlingTest.java, we just kill the VM
1337     // and don't take the time to generate a core file.
1338     os::signal_raise(SIGKILL);
1339   } else {
1340     ::abort();
1341   }
1342 }
1343 
1344 // DLL functions
1345 
1346 const char* os::dll_file_extension() { return ".so"; }
1347 
1348 // This must be hard coded because it's the system's temporary
1349 // directory not the java application's temp directory, ala java.io.tmpdir.
1350 const char* os::get_temp_directory() { return "/tmp"; }
1351 
1352 // check if addr is inside libjvm.so
1353 bool os::address_is_in_vm(address addr) {
1354   static address libjvm_base_addr;
1355   Dl_info dlinfo;
1356 
1357   if (libjvm_base_addr == NULL) {
1358     if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1359       libjvm_base_addr = (address)dlinfo.dli_fbase;
1360     }
1361     assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1362   }
1363 
1364   if (dladdr((void *)addr, &dlinfo) != 0) {
1365     if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1366   }
1367 
1368   return false;
1369 }
1370 
1371 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1372 static dladdr1_func_type dladdr1_func = NULL;
1373 
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375                                       int buflen, int * offset,
1376                                       bool demangle) {
1377   // buf is not optional, but offset is optional
1378   assert(buf != NULL, "sanity check");
1379 
1380   Dl_info dlinfo;
1381 
1382   // dladdr1_func was initialized in os::init()
1383   if (dladdr1_func != NULL) {
1384     // yes, we have dladdr1
1385 
1386     // Support for dladdr1 is checked at runtime; it may be
1387     // available even if the vm is built on a machine that does
1388     // not have dladdr1 support.  Make sure there is a value for
1389     // RTLD_DL_SYMENT.
1390 #ifndef RTLD_DL_SYMENT
1391   #define RTLD_DL_SYMENT 1
1392 #endif
1393 #ifdef _LP64
1394     Elf64_Sym * info;
1395 #else
1396     Elf32_Sym * info;
1397 #endif
1398     if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1399                      RTLD_DL_SYMENT) != 0) {
1400       // see if we have a matching symbol that covers our address
1401       if (dlinfo.dli_saddr != NULL &&
1402           (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1403         if (dlinfo.dli_sname != NULL) {
1404           if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1405             jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1406           }
1407           if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1408           return true;
1409         }
1410       }
1411       // no matching symbol so try for just file info
1412       if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1413         if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1414                             buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1415           return true;
1416         }
1417       }
1418     }
1419     buf[0] = '\0';
1420     if (offset != NULL) *offset  = -1;
1421     return false;
1422   }
1423 
1424   // no, only dladdr is available
1425   if (dladdr((void *)addr, &dlinfo) != 0) {
1426     // see if we have a matching symbol
1427     if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1428       if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1429         jio_snprintf(buf, buflen, dlinfo.dli_sname);
1430       }
1431       if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1432       return true;
1433     }
1434     // no matching symbol so try for just file info
1435     if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1436       if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1437                           buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1438         return true;
1439       }
1440     }
1441   }
1442   buf[0] = '\0';
1443   if (offset != NULL) *offset  = -1;
1444   return false;
1445 }
1446 
1447 bool os::dll_address_to_library_name(address addr, char* buf,
1448                                      int buflen, int* offset) {
1449   // buf is not optional, but offset is optional
1450   assert(buf != NULL, "sanity check");
1451 
1452   Dl_info dlinfo;
1453 
1454   if (dladdr((void*)addr, &dlinfo) != 0) {
1455     if (dlinfo.dli_fname != NULL) {
1456       jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1457     }
1458     if (dlinfo.dli_fbase != NULL && offset != NULL) {
1459       *offset = addr - (address)dlinfo.dli_fbase;
1460     }
1461     return true;
1462   }
1463 
1464   buf[0] = '\0';
1465   if (offset) *offset = -1;
1466   return false;
1467 }
1468 
1469 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1470   Dl_info dli;
1471   // Sanity check?
1472   if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1473       dli.dli_fname == NULL) {
1474     return 1;
1475   }
1476 
1477   void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1478   if (handle == NULL) {
1479     return 1;
1480   }
1481 
1482   Link_map *map;
1483   dlinfo(handle, RTLD_DI_LINKMAP, &map);
1484   if (map == NULL) {
1485     dlclose(handle);
1486     return 1;
1487   }
1488 
1489   while (map->l_prev != NULL) {
1490     map = map->l_prev;
1491   }
1492 
1493   while (map != NULL) {
1494     // Iterate through all map entries and call callback with fields of interest
1495     if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1496       dlclose(handle);
1497       return 1;
1498     }
1499     map = map->l_next;
1500   }
1501 
1502   dlclose(handle);
1503   return 0;
1504 }
1505 
1506 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1507   outputStream * out = (outputStream *) param;
1508   out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1509   return 0;
1510 }
1511 
1512 void os::print_dll_info(outputStream * st) {
1513   st->print_cr("Dynamic libraries:"); st->flush();
1514   if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1515     st->print_cr("Error: Cannot print dynamic libraries.");
1516   }
1517 }
1518 
1519 static void change_endianness(Elf32_Half& val) {
1520   unsigned char *ptr = (unsigned char *)&val;
1521   unsigned char swp = ptr[0];
1522   ptr[0] = ptr[1];
1523   ptr[1] = swp;
1524 }
1525 
1526 // Loads .dll/.so and
1527 // in case of error it checks if .dll/.so was built for the
1528 // same architecture as Hotspot is running on
1529 
1530 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1531   log_info(os)("attempting shared library load of %s", filename);
1532 
1533   void * result= ::dlopen(filename, RTLD_LAZY);
1534   if (result != NULL) {
1535     // Successful loading
1536     Events::log(NULL, "Loaded shared library %s", filename);
1537     log_info(os)("shared library load of %s was successful", filename);
1538     return result;
1539   }
1540 
1541   Elf32_Ehdr elf_head;
1542   const char* error_report = ::dlerror();
1543   if (error_report == NULL) {
1544     error_report = "dlerror returned no error description";
1545   }
1546   if (ebuf != NULL && ebuflen > 0) {
1547     ::strncpy(ebuf, error_report, ebuflen-1);
1548     ebuf[ebuflen-1]='\0';
1549   }
1550 
1551   Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1552   log_info(os)("shared library load of %s failed, %s", filename, error_report);
1553 
1554   int diag_msg_max_length=ebuflen-strlen(ebuf);
1555   char* diag_msg_buf=ebuf+strlen(ebuf);
1556 
1557   if (diag_msg_max_length==0) {
1558     // No more space in ebuf for additional diagnostics message
1559     return NULL;
1560   }
1561 
1562 
1563   int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1564 
1565   if (file_descriptor < 0) {
1566     // Can't open library, report dlerror() message
1567     return NULL;
1568   }
1569 
1570   bool failed_to_read_elf_head=
1571     (sizeof(elf_head)!=
1572      (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1573 
1574   ::close(file_descriptor);
1575   if (failed_to_read_elf_head) {
1576     // file i/o error - report dlerror() msg
1577     return NULL;
1578   }
1579 
1580   if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) {
1581     // handle invalid/out of range endianness values
1582     if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) {
1583       return NULL;
1584     }
1585     change_endianness(elf_head.e_machine);
1586   }
1587 
1588   typedef struct {
1589     Elf32_Half    code;         // Actual value as defined in elf.h
1590     Elf32_Half    compat_class; // Compatibility of archs at VM's sense
1591     unsigned char elf_class;    // 32 or 64 bit
1592     unsigned char endianess;    // MSB or LSB
1593     char*         name;         // String representation
1594   } arch_t;
1595 
1596 #ifndef EM_AARCH64
1597   #define EM_AARCH64    183               /* ARM AARCH64 */
1598 #endif
1599 
1600   static const arch_t arch_array[]={
1601     {EM_386,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1602     {EM_486,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1603     {EM_IA_64,       EM_IA_64,   ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1604     {EM_X86_64,      EM_X86_64,  ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1605     {EM_SPARC,       EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1606     {EM_SPARC32PLUS, EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1607     {EM_SPARCV9,     EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1608     {EM_PPC,         EM_PPC,     ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1609     {EM_PPC64,       EM_PPC64,   ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1610     {EM_ARM,         EM_ARM,     ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1611     // we only support 64 bit z architecture
1612     {EM_S390,        EM_S390,    ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"},
1613     {EM_AARCH64,     EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"}
1614   };
1615 
1616 #if  (defined IA32)
1617   static  Elf32_Half running_arch_code=EM_386;
1618 #elif   (defined AMD64)
1619   static  Elf32_Half running_arch_code=EM_X86_64;
1620 #elif  (defined IA64)
1621   static  Elf32_Half running_arch_code=EM_IA_64;
1622 #elif  (defined __sparc) && (defined _LP64)
1623   static  Elf32_Half running_arch_code=EM_SPARCV9;
1624 #elif  (defined __sparc) && (!defined _LP64)
1625   static  Elf32_Half running_arch_code=EM_SPARC;
1626 #elif  (defined __powerpc64__)
1627   static  Elf32_Half running_arch_code=EM_PPC64;
1628 #elif  (defined __powerpc__)
1629   static  Elf32_Half running_arch_code=EM_PPC;
1630 #elif (defined ARM)
1631   static  Elf32_Half running_arch_code=EM_ARM;
1632 #else
1633   #error Method os::dll_load requires that one of following is defined:\
1634        IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1635 #endif
1636 
1637   // Identify compatibility class for VM's architecture and library's architecture
1638   // Obtain string descriptions for architectures
1639 
1640   arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1641   int running_arch_index=-1;
1642 
1643   for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1644     if (running_arch_code == arch_array[i].code) {
1645       running_arch_index    = i;
1646     }
1647     if (lib_arch.code == arch_array[i].code) {
1648       lib_arch.compat_class = arch_array[i].compat_class;
1649       lib_arch.name         = arch_array[i].name;
1650     }
1651   }
1652 
1653   assert(running_arch_index != -1,
1654          "Didn't find running architecture code (running_arch_code) in arch_array");
1655   if (running_arch_index == -1) {
1656     // Even though running architecture detection failed
1657     // we may still continue with reporting dlerror() message
1658     return NULL;
1659   }
1660 
1661   if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1662     if (lib_arch.name != NULL) {
1663       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1664                  " (Possible cause: can't load %s .so on a %s platform)",
1665                  lib_arch.name, arch_array[running_arch_index].name);
1666     } else {
1667       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1668                  " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)",
1669                  lib_arch.code, arch_array[running_arch_index].name);
1670     }
1671     return NULL;
1672   }
1673 
1674   if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1675     ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1676     return NULL;
1677   }
1678 
1679   // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit
1680   if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) {
1681     ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)");
1682     return NULL;
1683   }
1684 
1685   if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1686     ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1687                " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)",
1688                (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32);
1689     return NULL;
1690   }
1691 
1692   return NULL;
1693 }
1694 
1695 void* os::dll_lookup(void* handle, const char* name) {
1696   return dlsym(handle, name);
1697 }
1698 
1699 void* os::get_default_process_handle() {
1700   return (void*)::dlopen(NULL, RTLD_LAZY);
1701 }
1702 
1703 static inline time_t get_mtime(const char* filename) {
1704   struct stat st;
1705   int ret = os::stat(filename, &st);
1706   assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1707   return st.st_mtime;
1708 }
1709 
1710 int os::compare_file_modified_times(const char* file1, const char* file2) {
1711   time_t t1 = get_mtime(file1);
1712   time_t t2 = get_mtime(file2);
1713   return t1 - t2;
1714 }
1715 
1716 static bool _print_ascii_file(const char* filename, outputStream* st) {
1717   int fd = ::open(filename, O_RDONLY);
1718   if (fd == -1) {
1719     return false;
1720   }
1721 
1722   char buf[32];
1723   int bytes;
1724   while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1725     st->print_raw(buf, bytes);
1726   }
1727 
1728   ::close(fd);
1729 
1730   return true;
1731 }
1732 
1733 void os::print_os_info_brief(outputStream* st) {
1734   os::Solaris::print_distro_info(st);
1735 
1736   os::Posix::print_uname_info(st);
1737 
1738   os::Solaris::print_libversion_info(st);
1739 }
1740 
1741 void os::print_os_info(outputStream* st) {
1742   st->print("OS:");
1743 
1744   os::Solaris::print_distro_info(st);
1745 
1746   os::Posix::print_uname_info(st);
1747 
1748   os::Solaris::print_libversion_info(st);
1749 
1750   os::Posix::print_rlimit_info(st);
1751 
1752   os::Posix::print_load_average(st);
1753 }
1754 
1755 void os::Solaris::print_distro_info(outputStream* st) {
1756   if (!_print_ascii_file("/etc/release", st)) {
1757     st->print("Solaris");
1758   }
1759   st->cr();
1760 }
1761 
1762 void os::get_summary_os_info(char* buf, size_t buflen) {
1763   strncpy(buf, "Solaris", buflen);  // default to plain solaris
1764   FILE* fp = fopen("/etc/release", "r");
1765   if (fp != NULL) {
1766     char tmp[256];
1767     // Only get the first line and chop out everything but the os name.
1768     if (fgets(tmp, sizeof(tmp), fp)) {
1769       char* ptr = tmp;
1770       // skip past whitespace characters
1771       while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1772       if (*ptr != '\0') {
1773         char* nl = strchr(ptr, '\n');
1774         if (nl != NULL) *nl = '\0';
1775         strncpy(buf, ptr, buflen);
1776       }
1777     }
1778     fclose(fp);
1779   }
1780 }
1781 
1782 void os::Solaris::print_libversion_info(outputStream* st) {
1783   st->print("  (T2 libthread)");
1784   st->cr();
1785 }
1786 
1787 static bool check_addr0(outputStream* st) {
1788   jboolean status = false;
1789   const int read_chunk = 200;
1790   int ret = 0;
1791   int nmap = 0;
1792   int fd = ::open("/proc/self/map",O_RDONLY);
1793   if (fd >= 0) {
1794     prmap_t *p = NULL;
1795     char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1796     if (NULL == mbuff) {
1797       ::close(fd);
1798       return status;
1799     }
1800     while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1801       //check if read() has not read partial data
1802       if( 0 != ret % sizeof(prmap_t)){
1803         break;
1804       }
1805       nmap = ret / sizeof(prmap_t);
1806       p = (prmap_t *)mbuff;
1807       for(int i = 0; i < nmap; i++){
1808         if (p->pr_vaddr == 0x0) {
1809           st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1810           st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1811           st->print("Access: ");
1812           st->print("%s",(p->pr_mflags & MA_READ)  ? "r" : "-");
1813           st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1814           st->print("%s",(p->pr_mflags & MA_EXEC)  ? "x" : "-");
1815           st->cr();
1816           status = true;
1817         }
1818         p++;
1819       }
1820     }
1821     free(mbuff);
1822     ::close(fd);
1823   }
1824   return status;
1825 }
1826 
1827 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1828   // Get MHz with system call. We don't seem to already have this.
1829   processor_info_t stats;
1830   processorid_t id = getcpuid();
1831   int clock = 0;
1832   if (processor_info(id, &stats) != -1) {
1833     clock = stats.pi_clock;  // pi_processor_type isn't more informative than below
1834   }
1835 #ifdef AMD64
1836   snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1837 #else
1838   // must be sparc
1839   snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1840 #endif
1841 }
1842 
1843 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1844   // Nothing to do for now.
1845 }
1846 
1847 void os::print_memory_info(outputStream* st) {
1848   st->print("Memory:");
1849   st->print(" %dk page", os::vm_page_size()>>10);
1850   st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1851   st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1852   st->cr();
1853   (void) check_addr0(st);
1854 }
1855 
1856 // Moved from whole group, because we need them here for diagnostic
1857 // prints.
1858 static int Maxsignum = 0;
1859 static int *ourSigFlags = NULL;
1860 
1861 int os::Solaris::get_our_sigflags(int sig) {
1862   assert(ourSigFlags!=NULL, "signal data structure not initialized");
1863   assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1864   return ourSigFlags[sig];
1865 }
1866 
1867 void os::Solaris::set_our_sigflags(int sig, int flags) {
1868   assert(ourSigFlags!=NULL, "signal data structure not initialized");
1869   assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1870   ourSigFlags[sig] = flags;
1871 }
1872 
1873 
1874 static const char* get_signal_handler_name(address handler,
1875                                            char* buf, int buflen) {
1876   int offset;
1877   bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1878   if (found) {
1879     // skip directory names
1880     const char *p1, *p2;
1881     p1 = buf;
1882     size_t len = strlen(os::file_separator());
1883     while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1884     jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1885   } else {
1886     jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1887   }
1888   return buf;
1889 }
1890 
1891 static void print_signal_handler(outputStream* st, int sig,
1892                                  char* buf, size_t buflen) {
1893   struct sigaction sa;
1894 
1895   sigaction(sig, NULL, &sa);
1896 
1897   st->print("%s: ", os::exception_name(sig, buf, buflen));
1898 
1899   address handler = (sa.sa_flags & SA_SIGINFO)
1900                   ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1901                   : CAST_FROM_FN_PTR(address, sa.sa_handler);
1902 
1903   if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1904     st->print("SIG_DFL");
1905   } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1906     st->print("SIG_IGN");
1907   } else {
1908     st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1909   }
1910 
1911   st->print(", sa_mask[0]=");
1912   os::Posix::print_signal_set_short(st, &sa.sa_mask);
1913 
1914   address rh = VMError::get_resetted_sighandler(sig);
1915   // May be, handler was resetted by VMError?
1916   if (rh != NULL) {
1917     handler = rh;
1918     sa.sa_flags = VMError::get_resetted_sigflags(sig);
1919   }
1920 
1921   st->print(", sa_flags=");
1922   os::Posix::print_sa_flags(st, sa.sa_flags);
1923 
1924   // Check: is it our handler?
1925   if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1926     // It is our signal handler
1927     // check for flags
1928     if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1929       st->print(
1930                 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1931                 os::Solaris::get_our_sigflags(sig));
1932     }
1933   }
1934   st->cr();
1935 }
1936 
1937 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1938   st->print_cr("Signal Handlers:");
1939   print_signal_handler(st, SIGSEGV, buf, buflen);
1940   print_signal_handler(st, SIGBUS , buf, buflen);
1941   print_signal_handler(st, SIGFPE , buf, buflen);
1942   print_signal_handler(st, SIGPIPE, buf, buflen);
1943   print_signal_handler(st, SIGXFSZ, buf, buflen);
1944   print_signal_handler(st, SIGILL , buf, buflen);
1945   print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1946   print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1947   print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1948   print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1949   print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1950 }
1951 
1952 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1953 
1954 // Find the full path to the current module, libjvm.so
1955 void os::jvm_path(char *buf, jint buflen) {
1956   // Error checking.
1957   if (buflen < MAXPATHLEN) {
1958     assert(false, "must use a large-enough buffer");
1959     buf[0] = '\0';
1960     return;
1961   }
1962   // Lazy resolve the path to current module.
1963   if (saved_jvm_path[0] != 0) {
1964     strcpy(buf, saved_jvm_path);
1965     return;
1966   }
1967 
1968   Dl_info dlinfo;
1969   int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1970   assert(ret != 0, "cannot locate libjvm");
1971   if (ret != 0 && dlinfo.dli_fname != NULL) {
1972     if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1973       return;
1974     }
1975   } else {
1976     buf[0] = '\0';
1977     return;
1978   }
1979 
1980   if (Arguments::sun_java_launcher_is_altjvm()) {
1981     // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1982     // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1983     // If "/jre/lib/" appears at the right place in the string, then
1984     // assume we are installed in a JDK and we're done.  Otherwise, check
1985     // for a JAVA_HOME environment variable and fix up the path so it
1986     // looks like libjvm.so is installed there (append a fake suffix
1987     // hotspot/libjvm.so).
1988     const char *p = buf + strlen(buf) - 1;
1989     for (int count = 0; p > buf && count < 5; ++count) {
1990       for (--p; p > buf && *p != '/'; --p)
1991         /* empty */ ;
1992     }
1993 
1994     if (strncmp(p, "/jre/lib/", 9) != 0) {
1995       // Look for JAVA_HOME in the environment.
1996       char* java_home_var = ::getenv("JAVA_HOME");
1997       if (java_home_var != NULL && java_home_var[0] != 0) {
1998         char* jrelib_p;
1999         int   len;
2000 
2001         // Check the current module name "libjvm.so".
2002         p = strrchr(buf, '/');
2003         assert(strstr(p, "/libjvm") == p, "invalid library name");
2004 
2005         if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
2006           return;
2007         }
2008         // determine if this is a legacy image or modules image
2009         // modules image doesn't have "jre" subdirectory
2010         len = strlen(buf);
2011         assert(len < buflen, "Ran out of buffer space");
2012         jrelib_p = buf + len;
2013         snprintf(jrelib_p, buflen-len, "/jre/lib");
2014         if (0 != access(buf, F_OK)) {
2015           snprintf(jrelib_p, buflen-len, "/lib");
2016         }
2017 
2018         if (0 == access(buf, F_OK)) {
2019           // Use current module name "libjvm.so"
2020           len = strlen(buf);
2021           snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2022         } else {
2023           // Go back to path of .so
2024           if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2025             return;
2026           }
2027         }
2028       }
2029     }
2030   }
2031 
2032   strncpy(saved_jvm_path, buf, MAXPATHLEN);
2033   saved_jvm_path[MAXPATHLEN - 1] = '\0';
2034 }
2035 
2036 
2037 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2038   // no prefix required, not even "_"
2039 }
2040 
2041 
2042 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2043   // no suffix required
2044 }
2045 
2046 // sun.misc.Signal
2047 
2048 extern "C" {
2049   static void UserHandler(int sig, void *siginfo, void *context) {
2050     // Ctrl-C is pressed during error reporting, likely because the error
2051     // handler fails to abort. Let VM die immediately.
2052     if (sig == SIGINT && VMError::is_error_reported()) {
2053       os::die();
2054     }
2055 
2056     os::signal_notify(sig);
2057     // We do not need to reinstate the signal handler each time...
2058   }
2059 }
2060 
2061 void* os::user_handler() {
2062   return CAST_FROM_FN_PTR(void*, UserHandler);
2063 }
2064 
2065 extern "C" {
2066   typedef void (*sa_handler_t)(int);
2067   typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2068 }
2069 
2070 void* os::signal(int signal_number, void* handler) {
2071   struct sigaction sigAct, oldSigAct;
2072   sigfillset(&(sigAct.sa_mask));
2073   sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2074   sigAct.sa_flags |= SA_SIGINFO;
2075   sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2076 
2077   if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2078     // -1 means registration failed
2079     return (void *)-1;
2080   }
2081 
2082   return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2083 }
2084 
2085 void os::signal_raise(int signal_number) {
2086   raise(signal_number);
2087 }
2088 
2089 // The following code is moved from os.cpp for making this
2090 // code platform specific, which it is by its very nature.
2091 
2092 // a counter for each possible signal value
2093 static int Sigexit = 0;
2094 static jint *pending_signals = NULL;
2095 static int *preinstalled_sigs = NULL;
2096 static struct sigaction *chainedsigactions = NULL;
2097 static Semaphore* sig_sem = NULL;
2098 
2099 int os::sigexitnum_pd() {
2100   assert(Sigexit > 0, "signal memory not yet initialized");
2101   return Sigexit;
2102 }
2103 
2104 void os::Solaris::init_signal_mem() {
2105   // Initialize signal structures
2106   Maxsignum = SIGRTMAX;
2107   Sigexit = Maxsignum+1;
2108   assert(Maxsignum >0, "Unable to obtain max signal number");
2109 
2110   // Initialize signal structures
2111   // pending_signals has one int per signal
2112   // The additional signal is for SIGEXIT - exit signal to signal_thread
2113   pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2114   memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2115 
2116   if (UseSignalChaining) {
2117     chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2118                                                    * (Maxsignum + 1), mtInternal);
2119     memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2120     preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2121     memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2122   }
2123   ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2124   memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2125 }
2126 
2127 static void jdk_misc_signal_init() {
2128   // Initialize signal semaphore
2129   sig_sem = new Semaphore();
2130 }
2131 
2132 void os::signal_notify(int sig) {
2133   if (sig_sem != NULL) {
2134     Atomic::inc(&pending_signals[sig]);
2135     sig_sem->signal();
2136   } else {
2137     // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2138     // initialization isn't called.
2139     assert(ReduceSignalUsage, "signal semaphore should be created");
2140   }
2141 }
2142 
2143 static int check_pending_signals() {
2144   int ret;
2145   while (true) {
2146     for (int i = 0; i < Sigexit + 1; i++) {
2147       jint n = pending_signals[i];
2148       if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2149         return i;
2150       }
2151     }
2152     JavaThread *thread = JavaThread::current();
2153     ThreadBlockInVM tbivm(thread);
2154 
2155     bool threadIsSuspended;
2156     do {
2157       thread->set_suspend_equivalent();
2158       sig_sem->wait();
2159 
2160       // were we externally suspended while we were waiting?
2161       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2162       if (threadIsSuspended) {
2163         // The semaphore has been incremented, but while we were waiting
2164         // another thread suspended us. We don't want to continue running
2165         // while suspended because that would surprise the thread that
2166         // suspended us.
2167         sig_sem->signal();
2168 
2169         thread->java_suspend_self();
2170       }
2171     } while (threadIsSuspended);
2172   }
2173 }
2174 
2175 int os::signal_wait() {
2176   return check_pending_signals();
2177 }
2178 
2179 ////////////////////////////////////////////////////////////////////////////////
2180 // Virtual Memory
2181 
2182 static int page_size = -1;
2183 
2184 int os::vm_page_size() {
2185   assert(page_size != -1, "must call os::init");
2186   return page_size;
2187 }
2188 
2189 // Solaris allocates memory by pages.
2190 int os::vm_allocation_granularity() {
2191   assert(page_size != -1, "must call os::init");
2192   return page_size;
2193 }
2194 
2195 static bool recoverable_mmap_error(int err) {
2196   // See if the error is one we can let the caller handle. This
2197   // list of errno values comes from the Solaris mmap(2) man page.
2198   switch (err) {
2199   case EBADF:
2200   case EINVAL:
2201   case ENOTSUP:
2202     // let the caller deal with these errors
2203     return true;
2204 
2205   default:
2206     // Any remaining errors on this OS can cause our reserved mapping
2207     // to be lost. That can cause confusion where different data
2208     // structures think they have the same memory mapped. The worst
2209     // scenario is if both the VM and a library think they have the
2210     // same memory mapped.
2211     return false;
2212   }
2213 }
2214 
2215 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2216                                     int err) {
2217   warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2218           ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2219           os::strerror(err), err);
2220 }
2221 
2222 static void warn_fail_commit_memory(char* addr, size_t bytes,
2223                                     size_t alignment_hint, bool exec,
2224                                     int err) {
2225   warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2226           ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2227           alignment_hint, exec, os::strerror(err), err);
2228 }
2229 
2230 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2231   int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2232   size_t size = bytes;
2233   char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2234   if (res != NULL) {
2235     if (UseNUMAInterleaving) {
2236       numa_make_global(addr, bytes);
2237     }
2238     return 0;
2239   }
2240 
2241   int err = errno;  // save errno from mmap() call in mmap_chunk()
2242 
2243   if (!recoverable_mmap_error(err)) {
2244     warn_fail_commit_memory(addr, bytes, exec, err);
2245     vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2246   }
2247 
2248   return err;
2249 }
2250 
2251 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2252   return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2253 }
2254 
2255 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2256                                   const char* mesg) {
2257   assert(mesg != NULL, "mesg must be specified");
2258   int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2259   if (err != 0) {
2260     // the caller wants all commit errors to exit with the specified mesg:
2261     warn_fail_commit_memory(addr, bytes, exec, err);
2262     vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2263   }
2264 }
2265 
2266 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2267   assert(is_aligned(alignment, (size_t) vm_page_size()),
2268          SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2269          alignment, (size_t) vm_page_size());
2270 
2271   for (int i = 0; _page_sizes[i] != 0; i++) {
2272     if (is_aligned(alignment, _page_sizes[i])) {
2273       return _page_sizes[i];
2274     }
2275   }
2276 
2277   return (size_t) vm_page_size();
2278 }
2279 
2280 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2281                                     size_t alignment_hint, bool exec) {
2282   int err = Solaris::commit_memory_impl(addr, bytes, exec);
2283   if (err == 0 && UseLargePages && alignment_hint > 0) {
2284     assert(is_aligned(bytes, alignment_hint),
2285            SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2286 
2287     // The syscall memcntl requires an exact page size (see man memcntl for details).
2288     size_t page_size = page_size_for_alignment(alignment_hint);
2289     if (page_size > (size_t) vm_page_size()) {
2290       (void)Solaris::setup_large_pages(addr, bytes, page_size);
2291     }
2292   }
2293   return err;
2294 }
2295 
2296 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2297                           bool exec) {
2298   return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2299 }
2300 
2301 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2302                                   size_t alignment_hint, bool exec,
2303                                   const char* mesg) {
2304   assert(mesg != NULL, "mesg must be specified");
2305   int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2306   if (err != 0) {
2307     // the caller wants all commit errors to exit with the specified mesg:
2308     warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2309     vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2310   }
2311 }
2312 
2313 // Uncommit the pages in a specified region.
2314 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2315   if (madvise(addr, bytes, MADV_FREE) < 0) {
2316     debug_only(warning("MADV_FREE failed."));
2317     return;
2318   }
2319 }
2320 
2321 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2322   return os::commit_memory(addr, size, !ExecMem);
2323 }
2324 
2325 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2326   return os::uncommit_memory(addr, size);
2327 }
2328 
2329 // Change the page size in a given range.
2330 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2331   assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2332   assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2333   if (UseLargePages) {
2334     size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2335     if (page_size > (size_t) vm_page_size()) {
2336       Solaris::setup_large_pages(addr, bytes, page_size);
2337     }
2338   }
2339 }
2340 
2341 // Tell the OS to make the range local to the first-touching LWP
2342 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2343   assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2344   if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2345     debug_only(warning("MADV_ACCESS_LWP failed."));
2346   }
2347 }
2348 
2349 // Tell the OS that this range would be accessed from different LWPs.
2350 void os::numa_make_global(char *addr, size_t bytes) {
2351   assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2352   if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2353     debug_only(warning("MADV_ACCESS_MANY failed."));
2354   }
2355 }
2356 
2357 // Get the number of the locality groups.
2358 size_t os::numa_get_groups_num() {
2359   size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2360   return n != -1 ? n : 1;
2361 }
2362 
2363 // Get a list of leaf locality groups. A leaf lgroup is group that
2364 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2365 // board. An LWP is assigned to one of these groups upon creation.
2366 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2367   if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2368     ids[0] = 0;
2369     return 1;
2370   }
2371   int result_size = 0, top = 1, bottom = 0, cur = 0;
2372   for (int k = 0; k < size; k++) {
2373     int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2374                                    (Solaris::lgrp_id_t*)&ids[top], size - top);
2375     if (r == -1) {
2376       ids[0] = 0;
2377       return 1;
2378     }
2379     if (!r) {
2380       // That's a leaf node.
2381       assert(bottom <= cur, "Sanity check");
2382       // Check if the node has memory
2383       if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2384                                   NULL, 0, LGRP_RSRC_MEM) > 0) {
2385         ids[bottom++] = ids[cur];
2386       }
2387     }
2388     top += r;
2389     cur++;
2390   }
2391   if (bottom == 0) {
2392     // Handle a situation, when the OS reports no memory available.
2393     // Assume UMA architecture.
2394     ids[0] = 0;
2395     return 1;
2396   }
2397   return bottom;
2398 }
2399 
2400 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2401 bool os::numa_topology_changed() {
2402   int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2403   if (is_stale != -1 && is_stale) {
2404     Solaris::lgrp_fini(Solaris::lgrp_cookie());
2405     Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2406     assert(c != 0, "Failure to initialize LGRP API");
2407     Solaris::set_lgrp_cookie(c);
2408     return true;
2409   }
2410   return false;
2411 }
2412 
2413 // Get the group id of the current LWP.
2414 int os::numa_get_group_id() {
2415   int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2416   if (lgrp_id == -1) {
2417     return 0;
2418   }
2419   const int size = os::numa_get_groups_num();
2420   int *ids = (int*)alloca(size * sizeof(int));
2421 
2422   // Get the ids of all lgroups with memory; r is the count.
2423   int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2424                                   (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2425   if (r <= 0) {
2426     return 0;
2427   }
2428   return ids[os::random() % r];
2429 }
2430 
2431 // Request information about the page.
2432 bool os::get_page_info(char *start, page_info* info) {
2433   const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2434   uint64_t addr = (uintptr_t)start;
2435   uint64_t outdata[2];
2436   uint_t validity = 0;
2437 
2438   if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2439     return false;
2440   }
2441 
2442   info->size = 0;
2443   info->lgrp_id = -1;
2444 
2445   if ((validity & 1) != 0) {
2446     if ((validity & 2) != 0) {
2447       info->lgrp_id = outdata[0];
2448     }
2449     if ((validity & 4) != 0) {
2450       info->size = outdata[1];
2451     }
2452     return true;
2453   }
2454   return false;
2455 }
2456 
2457 // Scan the pages from start to end until a page different than
2458 // the one described in the info parameter is encountered.
2459 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2460                      page_info* page_found) {
2461   const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2462   const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2463   uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2464   uint_t validity[MAX_MEMINFO_CNT];
2465 
2466   size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2467   uint64_t p = (uint64_t)start;
2468   while (p < (uint64_t)end) {
2469     addrs[0] = p;
2470     size_t addrs_count = 1;
2471     while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2472       addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2473       addrs_count++;
2474     }
2475 
2476     if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2477       return NULL;
2478     }
2479 
2480     size_t i = 0;
2481     for (; i < addrs_count; i++) {
2482       if ((validity[i] & 1) != 0) {
2483         if ((validity[i] & 4) != 0) {
2484           if (outdata[types * i + 1] != page_expected->size) {
2485             break;
2486           }
2487         } else if (page_expected->size != 0) {
2488           break;
2489         }
2490 
2491         if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2492           if (outdata[types * i] != page_expected->lgrp_id) {
2493             break;
2494           }
2495         }
2496       } else {
2497         return NULL;
2498       }
2499     }
2500 
2501     if (i < addrs_count) {
2502       if ((validity[i] & 2) != 0) {
2503         page_found->lgrp_id = outdata[types * i];
2504       } else {
2505         page_found->lgrp_id = -1;
2506       }
2507       if ((validity[i] & 4) != 0) {
2508         page_found->size = outdata[types * i + 1];
2509       } else {
2510         page_found->size = 0;
2511       }
2512       return (char*)addrs[i];
2513     }
2514 
2515     p = addrs[addrs_count - 1] + page_size;
2516   }
2517   return end;
2518 }
2519 
2520 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2521   size_t size = bytes;
2522   // Map uncommitted pages PROT_NONE so we fail early if we touch an
2523   // uncommitted page. Otherwise, the read/write might succeed if we
2524   // have enough swap space to back the physical page.
2525   return
2526     NULL != Solaris::mmap_chunk(addr, size,
2527                                 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2528                                 PROT_NONE);
2529 }
2530 
2531 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2532   char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2533 
2534   if (b == MAP_FAILED) {
2535     return NULL;
2536   }
2537   return b;
2538 }
2539 
2540 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2541                              size_t alignment_hint, bool fixed) {
2542   char* addr = requested_addr;
2543   int flags = MAP_PRIVATE | MAP_NORESERVE;
2544 
2545   assert(!(fixed && (alignment_hint > 0)),
2546          "alignment hint meaningless with fixed mmap");
2547 
2548   if (fixed) {
2549     flags |= MAP_FIXED;
2550   } else if (alignment_hint > (size_t) vm_page_size()) {
2551     flags |= MAP_ALIGN;
2552     addr = (char*) alignment_hint;
2553   }
2554 
2555   // Map uncommitted pages PROT_NONE so we fail early if we touch an
2556   // uncommitted page. Otherwise, the read/write might succeed if we
2557   // have enough swap space to back the physical page.
2558   return mmap_chunk(addr, bytes, flags, PROT_NONE);
2559 }
2560 
2561 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2562                             size_t alignment_hint) {
2563   char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2564                                   (requested_addr != NULL));
2565 
2566   guarantee(requested_addr == NULL || requested_addr == addr,
2567             "OS failed to return requested mmap address.");
2568   return addr;
2569 }
2570 
2571 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2572   assert(file_desc >= 0, "file_desc is not valid");
2573   char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2574   if (result != NULL) {
2575     if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2576       vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2577     }
2578   }
2579   return result;
2580 }
2581 
2582 // Reserve memory at an arbitrary address, only if that area is
2583 // available (and not reserved for something else).
2584 
2585 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2586   // Assert only that the size is a multiple of the page size, since
2587   // that's all that mmap requires, and since that's all we really know
2588   // about at this low abstraction level.  If we need higher alignment,
2589   // we can either pass an alignment to this method or verify alignment
2590   // in one of the methods further up the call chain.  See bug 5044738.
2591   assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2592 
2593   // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2594   char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2595 
2596   volatile int err = errno;
2597   if (addr == requested_addr) {
2598     return addr;
2599   }
2600 
2601   if (addr != NULL) {
2602     pd_unmap_memory(addr, bytes);
2603   }
2604 
2605   return NULL;
2606 }
2607 
2608 bool os::pd_release_memory(char* addr, size_t bytes) {
2609   size_t size = bytes;
2610   return munmap(addr, size) == 0;
2611 }
2612 
2613 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2614   assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2615          "addr must be page aligned");
2616   Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot);
2617   int retVal = mprotect(addr, bytes, prot);
2618   return retVal == 0;
2619 }
2620 
2621 // Protect memory (Used to pass readonly pages through
2622 // JNI GetArray<type>Elements with empty arrays.)
2623 // Also, used for serialization page and for compressed oops null pointer
2624 // checking.
2625 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2626                         bool is_committed) {
2627   unsigned int p = 0;
2628   switch (prot) {
2629   case MEM_PROT_NONE: p = PROT_NONE; break;
2630   case MEM_PROT_READ: p = PROT_READ; break;
2631   case MEM_PROT_RW:   p = PROT_READ|PROT_WRITE; break;
2632   case MEM_PROT_RWX:  p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2633   default:
2634     ShouldNotReachHere();
2635   }
2636   // is_committed is unused.
2637   return solaris_mprotect(addr, bytes, p);
2638 }
2639 
2640 // guard_memory and unguard_memory only happens within stack guard pages.
2641 // Since ISM pertains only to the heap, guard and unguard memory should not
2642 /// happen with an ISM region.
2643 bool os::guard_memory(char* addr, size_t bytes) {
2644   return solaris_mprotect(addr, bytes, PROT_NONE);
2645 }
2646 
2647 bool os::unguard_memory(char* addr, size_t bytes) {
2648   return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2649 }
2650 
2651 // Large page support
2652 static size_t _large_page_size = 0;
2653 
2654 // Insertion sort for small arrays (descending order).
2655 static void insertion_sort_descending(size_t* array, int len) {
2656   for (int i = 0; i < len; i++) {
2657     size_t val = array[i];
2658     for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2659       size_t tmp = array[key];
2660       array[key] = array[key - 1];
2661       array[key - 1] = tmp;
2662     }
2663   }
2664 }
2665 
2666 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2667   const unsigned int usable_count = VM_Version::page_size_count();
2668   if (usable_count == 1) {
2669     return false;
2670   }
2671 
2672   // Find the right getpagesizes interface.  When solaris 11 is the minimum
2673   // build platform, getpagesizes() (without the '2') can be called directly.
2674   typedef int (*gps_t)(size_t[], int);
2675   gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2676   if (gps_func == NULL) {
2677     gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2678     if (gps_func == NULL) {
2679       if (warn) {
2680         warning("MPSS is not supported by the operating system.");
2681       }
2682       return false;
2683     }
2684   }
2685 
2686   // Fill the array of page sizes.
2687   int n = (*gps_func)(_page_sizes, page_sizes_max);
2688   assert(n > 0, "Solaris bug?");
2689 
2690   if (n == page_sizes_max) {
2691     // Add a sentinel value (necessary only if the array was completely filled
2692     // since it is static (zeroed at initialization)).
2693     _page_sizes[--n] = 0;
2694     DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2695   }
2696   assert(_page_sizes[n] == 0, "missing sentinel");
2697   trace_page_sizes("available page sizes", _page_sizes, n);
2698 
2699   if (n == 1) return false;     // Only one page size available.
2700 
2701   // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2702   // select up to usable_count elements.  First sort the array, find the first
2703   // acceptable value, then copy the usable sizes to the top of the array and
2704   // trim the rest.  Make sure to include the default page size :-).
2705   //
2706   // A better policy could get rid of the 4M limit by taking the sizes of the
2707   // important VM memory regions (java heap and possibly the code cache) into
2708   // account.
2709   insertion_sort_descending(_page_sizes, n);
2710   const size_t size_limit =
2711     FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2712   int beg;
2713   for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2714   const int end = MIN2((int)usable_count, n) - 1;
2715   for (int cur = 0; cur < end; ++cur, ++beg) {
2716     _page_sizes[cur] = _page_sizes[beg];
2717   }
2718   _page_sizes[end] = vm_page_size();
2719   _page_sizes[end + 1] = 0;
2720 
2721   if (_page_sizes[end] > _page_sizes[end - 1]) {
2722     // Default page size is not the smallest; sort again.
2723     insertion_sort_descending(_page_sizes, end + 1);
2724   }
2725   *page_size = _page_sizes[0];
2726 
2727   trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2728   return true;
2729 }
2730 
2731 void os::large_page_init() {
2732   if (UseLargePages) {
2733     // print a warning if any large page related flag is specified on command line
2734     bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages)        ||
2735                            !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2736 
2737     UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2738   }
2739 }
2740 
2741 bool os::Solaris::is_valid_page_size(size_t bytes) {
2742   for (int i = 0; _page_sizes[i] != 0; i++) {
2743     if (_page_sizes[i] == bytes) {
2744       return true;
2745     }
2746   }
2747   return false;
2748 }
2749 
2750 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2751   assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2752   assert(is_aligned((void*) start, align),
2753          PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2754   assert(is_aligned(bytes, align),
2755          SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2756 
2757   // Signal to OS that we want large pages for addresses
2758   // from addr, addr + bytes
2759   struct memcntl_mha mpss_struct;
2760   mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2761   mpss_struct.mha_pagesize = align;
2762   mpss_struct.mha_flags = 0;
2763   // Upon successful completion, memcntl() returns 0
2764   if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2765     debug_only(warning("Attempt to use MPSS failed."));
2766     return false;
2767   }
2768   return true;
2769 }
2770 
2771 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2772   fatal("os::reserve_memory_special should not be called on Solaris.");
2773   return NULL;
2774 }
2775 
2776 bool os::release_memory_special(char* base, size_t bytes) {
2777   fatal("os::release_memory_special should not be called on Solaris.");
2778   return false;
2779 }
2780 
2781 size_t os::large_page_size() {
2782   return _large_page_size;
2783 }
2784 
2785 // MPSS allows application to commit large page memory on demand; with ISM
2786 // the entire memory region must be allocated as shared memory.
2787 bool os::can_commit_large_page_memory() {
2788   return true;
2789 }
2790 
2791 bool os::can_execute_large_page_memory() {
2792   return true;
2793 }
2794 
2795 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2796 void os::infinite_sleep() {
2797   while (true) {    // sleep forever ...
2798     ::sleep(100);   // ... 100 seconds at a time
2799   }
2800 }
2801 
2802 // Used to convert frequent JVM_Yield() to nops
2803 bool os::dont_yield() {
2804   if (DontYieldALot) {
2805     static hrtime_t last_time = 0;
2806     hrtime_t diff = getTimeNanos() - last_time;
2807 
2808     if (diff < DontYieldALotInterval * 1000000) {
2809       return true;
2810     }
2811 
2812     last_time += diff;
2813 
2814     return false;
2815   } else {
2816     return false;
2817   }
2818 }
2819 
2820 // Note that yield semantics are defined by the scheduling class to which
2821 // the thread currently belongs.  Typically, yield will _not yield to
2822 // other equal or higher priority threads that reside on the dispatch queues
2823 // of other CPUs.
2824 
2825 void os::naked_yield() {
2826   thr_yield();
2827 }
2828 
2829 // Interface for setting lwp priorities.  We are using T2 libthread,
2830 // which forces the use of bound threads, so all of our threads will
2831 // be assigned to real lwp's.  Using the thr_setprio function is
2832 // meaningless in this mode so we must adjust the real lwp's priority.
2833 // The routines below implement the getting and setting of lwp priorities.
2834 //
2835 // Note: There are three priority scales used on Solaris.  Java priotities
2836 //       which range from 1 to 10, libthread "thr_setprio" scale which range
2837 //       from 0 to 127, and the current scheduling class of the process we
2838 //       are running in.  This is typically from -60 to +60.
2839 //       The setting of the lwp priorities in done after a call to thr_setprio
2840 //       so Java priorities are mapped to libthread priorities and we map from
2841 //       the latter to lwp priorities.  We don't keep priorities stored in
2842 //       Java priorities since some of our worker threads want to set priorities
2843 //       higher than all Java threads.
2844 //
2845 // For related information:
2846 // (1)  man -s 2 priocntl
2847 // (2)  man -s 4 priocntl
2848 // (3)  man dispadmin
2849 // =    librt.so
2850 // =    libthread/common/rtsched.c - thrp_setlwpprio().
2851 // =    ps -cL <pid> ... to validate priority.
2852 // =    sched_get_priority_min and _max
2853 //              pthread_create
2854 //              sched_setparam
2855 //              pthread_setschedparam
2856 //
2857 // Assumptions:
2858 // +    We assume that all threads in the process belong to the same
2859 //              scheduling class.   IE. an homogenous process.
2860 // +    Must be root or in IA group to change change "interactive" attribute.
2861 //              Priocntl() will fail silently.  The only indication of failure is when
2862 //              we read-back the value and notice that it hasn't changed.
2863 // +    Interactive threads enter the runq at the head, non-interactive at the tail.
2864 // +    For RT, change timeslice as well.  Invariant:
2865 //              constant "priority integral"
2866 //              Konst == TimeSlice * (60-Priority)
2867 //              Given a priority, compute appropriate timeslice.
2868 // +    Higher numerical values have higher priority.
2869 
2870 // sched class attributes
2871 typedef struct {
2872   int   schedPolicy;              // classID
2873   int   maxPrio;
2874   int   minPrio;
2875 } SchedInfo;
2876 
2877 
2878 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
2879 
2880 #ifdef ASSERT
2881 static int  ReadBackValidate = 1;
2882 #endif
2883 static int  myClass     = 0;
2884 static int  myMin       = 0;
2885 static int  myMax       = 0;
2886 static int  myCur       = 0;
2887 static bool priocntl_enable = false;
2888 
2889 static const int criticalPrio = FXCriticalPriority;
2890 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
2891 
2892 
2893 // lwp_priocntl_init
2894 //
2895 // Try to determine the priority scale for our process.
2896 //
2897 // Return errno or 0 if OK.
2898 //
2899 static int lwp_priocntl_init() {
2900   int rslt;
2901   pcinfo_t ClassInfo;
2902   pcparms_t ParmInfo;
2903   int i;
2904 
2905   if (!UseThreadPriorities) return 0;
2906 
2907   // If ThreadPriorityPolicy is 1, switch tables
2908   if (ThreadPriorityPolicy == 1) {
2909     for (i = 0; i < CriticalPriority+1; i++)
2910       os::java_to_os_priority[i] = prio_policy1[i];
2911   }
2912   if (UseCriticalJavaThreadPriority) {
2913     // MaxPriority always maps to the FX scheduling class and criticalPrio.
2914     // See set_native_priority() and set_lwp_class_and_priority().
2915     // Save original MaxPriority mapping in case attempt to
2916     // use critical priority fails.
2917     java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
2918     // Set negative to distinguish from other priorities
2919     os::java_to_os_priority[MaxPriority] = -criticalPrio;
2920   }
2921 
2922   // Get IDs for a set of well-known scheduling classes.
2923   // TODO-FIXME: GETCLINFO returns the current # of classes in the
2924   // the system.  We should have a loop that iterates over the
2925   // classID values, which are known to be "small" integers.
2926 
2927   strcpy(ClassInfo.pc_clname, "TS");
2928   ClassInfo.pc_cid = -1;
2929   rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2930   if (rslt < 0) return errno;
2931   assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
2932   tsLimits.schedPolicy = ClassInfo.pc_cid;
2933   tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
2934   tsLimits.minPrio = -tsLimits.maxPrio;
2935 
2936   strcpy(ClassInfo.pc_clname, "IA");
2937   ClassInfo.pc_cid = -1;
2938   rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2939   if (rslt < 0) return errno;
2940   assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
2941   iaLimits.schedPolicy = ClassInfo.pc_cid;
2942   iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
2943   iaLimits.minPrio = -iaLimits.maxPrio;
2944 
2945   strcpy(ClassInfo.pc_clname, "RT");
2946   ClassInfo.pc_cid = -1;
2947   rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2948   if (rslt < 0) return errno;
2949   assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
2950   rtLimits.schedPolicy = ClassInfo.pc_cid;
2951   rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
2952   rtLimits.minPrio = 0;
2953 
2954   strcpy(ClassInfo.pc_clname, "FX");
2955   ClassInfo.pc_cid = -1;
2956   rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2957   if (rslt < 0) return errno;
2958   assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
2959   fxLimits.schedPolicy = ClassInfo.pc_cid;
2960   fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
2961   fxLimits.minPrio = 0;
2962 
2963   // Query our "current" scheduling class.
2964   // This will normally be IA, TS or, rarely, FX or RT.
2965   memset(&ParmInfo, 0, sizeof(ParmInfo));
2966   ParmInfo.pc_cid = PC_CLNULL;
2967   rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
2968   if (rslt < 0) return errno;
2969   myClass = ParmInfo.pc_cid;
2970 
2971   // We now know our scheduling classId, get specific information
2972   // about the class.
2973   ClassInfo.pc_cid = myClass;
2974   ClassInfo.pc_clname[0] = 0;
2975   rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
2976   if (rslt < 0) return errno;
2977 
2978   if (ThreadPriorityVerbose) {
2979     tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
2980   }
2981 
2982   memset(&ParmInfo, 0, sizeof(pcparms_t));
2983   ParmInfo.pc_cid = PC_CLNULL;
2984   rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
2985   if (rslt < 0) return errno;
2986 
2987   if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
2988     myMin = rtLimits.minPrio;
2989     myMax = rtLimits.maxPrio;
2990   } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
2991     iaparms_t *iaInfo  = (iaparms_t*)ParmInfo.pc_clparms;
2992     myMin = iaLimits.minPrio;
2993     myMax = iaLimits.maxPrio;
2994     myMax = MIN2(myMax, (int)iaInfo->ia_uprilim);       // clamp - restrict
2995   } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
2996     tsparms_t *tsInfo  = (tsparms_t*)ParmInfo.pc_clparms;
2997     myMin = tsLimits.minPrio;
2998     myMax = tsLimits.maxPrio;
2999     myMax = MIN2(myMax, (int)tsInfo->ts_uprilim);       // clamp - restrict
3000   } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3001     fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3002     myMin = fxLimits.minPrio;
3003     myMax = fxLimits.maxPrio;
3004     myMax = MIN2(myMax, (int)fxInfo->fx_uprilim);       // clamp - restrict
3005   } else {
3006     // No clue - punt
3007     if (ThreadPriorityVerbose) {
3008       tty->print_cr("Unknown scheduling class: %s ... \n",
3009                     ClassInfo.pc_clname);
3010     }
3011     return EINVAL;      // no clue, punt
3012   }
3013 
3014   if (ThreadPriorityVerbose) {
3015     tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3016   }
3017 
3018   priocntl_enable = true;  // Enable changing priorities
3019   return 0;
3020 }
3021 
3022 #define IAPRI(x)        ((iaparms_t *)((x).pc_clparms))
3023 #define RTPRI(x)        ((rtparms_t *)((x).pc_clparms))
3024 #define TSPRI(x)        ((tsparms_t *)((x).pc_clparms))
3025 #define FXPRI(x)        ((fxparms_t *)((x).pc_clparms))
3026 
3027 
3028 // scale_to_lwp_priority
3029 //
3030 // Convert from the libthread "thr_setprio" scale to our current
3031 // lwp scheduling class scale.
3032 //
3033 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3034   int v;
3035 
3036   if (x == 127) return rMax;            // avoid round-down
3037   v = (((x*(rMax-rMin)))/128)+rMin;
3038   return v;
3039 }
3040 
3041 
3042 // set_lwp_class_and_priority
3043 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3044                                int newPrio, int new_class, bool scale) {
3045   int rslt;
3046   int Actual, Expected, prv;
3047   pcparms_t ParmInfo;                   // for GET-SET
3048 #ifdef ASSERT
3049   pcparms_t ReadBack;                   // for readback
3050 #endif
3051 
3052   // Set priority via PC_GETPARMS, update, PC_SETPARMS
3053   // Query current values.
3054   // TODO: accelerate this by eliminating the PC_GETPARMS call.
3055   // Cache "pcparms_t" in global ParmCache.
3056   // TODO: elide set-to-same-value
3057 
3058   // If something went wrong on init, don't change priorities.
3059   if (!priocntl_enable) {
3060     if (ThreadPriorityVerbose) {
3061       tty->print_cr("Trying to set priority but init failed, ignoring");
3062     }
3063     return EINVAL;
3064   }
3065 
3066   // If lwp hasn't started yet, just return
3067   // the _start routine will call us again.
3068   if (lwpid <= 0) {
3069     if (ThreadPriorityVerbose) {
3070       tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3071                     INTPTR_FORMAT " to %d, lwpid not set",
3072                     ThreadID, newPrio);
3073     }
3074     return 0;
3075   }
3076 
3077   if (ThreadPriorityVerbose) {
3078     tty->print_cr ("set_lwp_class_and_priority("
3079                    INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3080                    ThreadID, lwpid, newPrio);
3081   }
3082 
3083   memset(&ParmInfo, 0, sizeof(pcparms_t));
3084   ParmInfo.pc_cid = PC_CLNULL;
3085   rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3086   if (rslt < 0) return errno;
3087 
3088   int cur_class = ParmInfo.pc_cid;
3089   ParmInfo.pc_cid = (id_t)new_class;
3090 
3091   if (new_class == rtLimits.schedPolicy) {
3092     rtparms_t *rtInfo  = (rtparms_t*)ParmInfo.pc_clparms;
3093     rtInfo->rt_pri     = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3094                                                        rtLimits.maxPrio, newPrio)
3095                                : newPrio;
3096     rtInfo->rt_tqsecs  = RT_NOCHANGE;
3097     rtInfo->rt_tqnsecs = RT_NOCHANGE;
3098     if (ThreadPriorityVerbose) {
3099       tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3100     }
3101   } else if (new_class == iaLimits.schedPolicy) {
3102     iaparms_t* iaInfo  = (iaparms_t*)ParmInfo.pc_clparms;
3103     int maxClamped     = MIN2(iaLimits.maxPrio,
3104                               cur_class == new_class
3105                               ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3106     iaInfo->ia_upri    = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3107                                                        maxClamped, newPrio)
3108                                : newPrio;
3109     iaInfo->ia_uprilim = cur_class == new_class
3110                            ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3111     iaInfo->ia_mode    = IA_NOCHANGE;
3112     if (ThreadPriorityVerbose) {
3113       tty->print_cr("IA: [%d...%d] %d->%d\n",
3114                     iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3115     }
3116   } else if (new_class == tsLimits.schedPolicy) {
3117     tsparms_t* tsInfo  = (tsparms_t*)ParmInfo.pc_clparms;
3118     int maxClamped     = MIN2(tsLimits.maxPrio,
3119                               cur_class == new_class
3120                               ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3121     tsInfo->ts_upri    = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3122                                                        maxClamped, newPrio)
3123                                : newPrio;
3124     tsInfo->ts_uprilim = cur_class == new_class
3125                            ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3126     if (ThreadPriorityVerbose) {
3127       tty->print_cr("TS: [%d...%d] %d->%d\n",
3128                     tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3129     }
3130   } else if (new_class == fxLimits.schedPolicy) {
3131     fxparms_t* fxInfo  = (fxparms_t*)ParmInfo.pc_clparms;
3132     int maxClamped     = MIN2(fxLimits.maxPrio,
3133                               cur_class == new_class
3134                               ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3135     fxInfo->fx_upri    = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3136                                                        maxClamped, newPrio)
3137                                : newPrio;
3138     fxInfo->fx_uprilim = cur_class == new_class
3139                            ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3140     fxInfo->fx_tqsecs  = FX_NOCHANGE;
3141     fxInfo->fx_tqnsecs = FX_NOCHANGE;
3142     if (ThreadPriorityVerbose) {
3143       tty->print_cr("FX: [%d...%d] %d->%d\n",
3144                     fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3145     }
3146   } else {
3147     if (ThreadPriorityVerbose) {
3148       tty->print_cr("Unknown new scheduling class %d\n", new_class);
3149     }
3150     return EINVAL;    // no clue, punt
3151   }
3152 
3153   rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3154   if (ThreadPriorityVerbose && rslt) {
3155     tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3156   }
3157   if (rslt < 0) return errno;
3158 
3159 #ifdef ASSERT
3160   // Sanity check: read back what we just attempted to set.
3161   // In theory it could have changed in the interim ...
3162   //
3163   // The priocntl system call is tricky.
3164   // Sometimes it'll validate the priority value argument and
3165   // return EINVAL if unhappy.  At other times it fails silently.
3166   // Readbacks are prudent.
3167 
3168   if (!ReadBackValidate) return 0;
3169 
3170   memset(&ReadBack, 0, sizeof(pcparms_t));
3171   ReadBack.pc_cid = PC_CLNULL;
3172   rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3173   assert(rslt >= 0, "priocntl failed");
3174   Actual = Expected = 0xBAD;
3175   assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3176   if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3177     Actual   = RTPRI(ReadBack)->rt_pri;
3178     Expected = RTPRI(ParmInfo)->rt_pri;
3179   } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3180     Actual   = IAPRI(ReadBack)->ia_upri;
3181     Expected = IAPRI(ParmInfo)->ia_upri;
3182   } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3183     Actual   = TSPRI(ReadBack)->ts_upri;
3184     Expected = TSPRI(ParmInfo)->ts_upri;
3185   } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3186     Actual   = FXPRI(ReadBack)->fx_upri;
3187     Expected = FXPRI(ParmInfo)->fx_upri;
3188   } else {
3189     if (ThreadPriorityVerbose) {
3190       tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3191                     ParmInfo.pc_cid);
3192     }
3193   }
3194 
3195   if (Actual != Expected) {
3196     if (ThreadPriorityVerbose) {
3197       tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3198                      lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3199     }
3200   }
3201 #endif
3202 
3203   return 0;
3204 }
3205 
3206 // Solaris only gives access to 128 real priorities at a time,
3207 // so we expand Java's ten to fill this range.  This would be better
3208 // if we dynamically adjusted relative priorities.
3209 //
3210 // The ThreadPriorityPolicy option allows us to select 2 different
3211 // priority scales.
3212 //
3213 // ThreadPriorityPolicy=0
3214 // Since the Solaris' default priority is MaximumPriority, we do not
3215 // set a priority lower than Max unless a priority lower than
3216 // NormPriority is requested.
3217 //
3218 // ThreadPriorityPolicy=1
3219 // This mode causes the priority table to get filled with
3220 // linear values.  NormPriority get's mapped to 50% of the
3221 // Maximum priority an so on.  This will cause VM threads
3222 // to get unfair treatment against other Solaris processes
3223 // which do not explicitly alter their thread priorities.
3224 
3225 int os::java_to_os_priority[CriticalPriority + 1] = {
3226   -99999,         // 0 Entry should never be used
3227 
3228   0,              // 1 MinPriority
3229   32,             // 2
3230   64,             // 3
3231 
3232   96,             // 4
3233   127,            // 5 NormPriority
3234   127,            // 6
3235 
3236   127,            // 7
3237   127,            // 8
3238   127,            // 9 NearMaxPriority
3239 
3240   127,            // 10 MaxPriority
3241 
3242   -criticalPrio   // 11 CriticalPriority
3243 };
3244 
3245 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3246   OSThread* osthread = thread->osthread();
3247 
3248   // Save requested priority in case the thread hasn't been started
3249   osthread->set_native_priority(newpri);
3250 
3251   // Check for critical priority request
3252   bool fxcritical = false;
3253   if (newpri == -criticalPrio) {
3254     fxcritical = true;
3255     newpri = criticalPrio;
3256   }
3257 
3258   assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3259   if (!UseThreadPriorities) return OS_OK;
3260 
3261   int status = 0;
3262 
3263   if (!fxcritical) {
3264     // Use thr_setprio only if we have a priority that thr_setprio understands
3265     status = thr_setprio(thread->osthread()->thread_id(), newpri);
3266   }
3267 
3268   int lwp_status =
3269           set_lwp_class_and_priority(osthread->thread_id(),
3270                                      osthread->lwp_id(),
3271                                      newpri,
3272                                      fxcritical ? fxLimits.schedPolicy : myClass,
3273                                      !fxcritical);
3274   if (lwp_status != 0 && fxcritical) {
3275     // Try again, this time without changing the scheduling class
3276     newpri = java_MaxPriority_to_os_priority;
3277     lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3278                                             osthread->lwp_id(),
3279                                             newpri, myClass, false);
3280   }
3281   status |= lwp_status;
3282   return (status == 0) ? OS_OK : OS_ERR;
3283 }
3284 
3285 
3286 OSReturn os::get_native_priority(const Thread* const thread,
3287                                  int *priority_ptr) {
3288   int p;
3289   if (!UseThreadPriorities) {
3290     *priority_ptr = NormalPriority;
3291     return OS_OK;
3292   }
3293   int status = thr_getprio(thread->osthread()->thread_id(), &p);
3294   if (status != 0) {
3295     return OS_ERR;
3296   }
3297   *priority_ptr = p;
3298   return OS_OK;
3299 }
3300 
3301 ////////////////////////////////////////////////////////////////////////////////
3302 // suspend/resume support
3303 
3304 //  The low-level signal-based suspend/resume support is a remnant from the
3305 //  old VM-suspension that used to be for java-suspension, safepoints etc,
3306 //  within hotspot. Currently used by JFR's OSThreadSampler
3307 //
3308 //  The remaining code is greatly simplified from the more general suspension
3309 //  code that used to be used.
3310 //
3311 //  The protocol is quite simple:
3312 //  - suspend:
3313 //      - sends a signal to the target thread
3314 //      - polls the suspend state of the osthread using a yield loop
3315 //      - target thread signal handler (SR_handler) sets suspend state
3316 //        and blocks in sigsuspend until continued
3317 //  - resume:
3318 //      - sets target osthread state to continue
3319 //      - sends signal to end the sigsuspend loop in the SR_handler
3320 //
3321 //  Note that the SR_lock plays no role in this suspend/resume protocol,
3322 //  but is checked for NULL in SR_handler as a thread termination indicator.
3323 //  The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3324 //
3325 //  Note that resume_clear_context() and suspend_save_context() are needed
3326 //  by SR_handler(), so that fetch_frame_from_ucontext() works,
3327 //  which in part is used by:
3328 //    - Forte Analyzer: AsyncGetCallTrace()
3329 //    - StackBanging: get_frame_at_stack_banging_point()
3330 //    - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3331 
3332 static void resume_clear_context(OSThread *osthread) {
3333   osthread->set_ucontext(NULL);
3334 }
3335 
3336 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3337   osthread->set_ucontext(context);
3338 }
3339 
3340 static PosixSemaphore sr_semaphore;
3341 
3342 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3343   // Save and restore errno to avoid confusing native code with EINTR
3344   // after sigsuspend.
3345   int old_errno = errno;
3346 
3347   OSThread* osthread = thread->osthread();
3348   assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3349 
3350   os::SuspendResume::State current = osthread->sr.state();
3351   if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3352     suspend_save_context(osthread, context);
3353 
3354     // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3355     os::SuspendResume::State state = osthread->sr.suspended();
3356     if (state == os::SuspendResume::SR_SUSPENDED) {
3357       sigset_t suspend_set;  // signals for sigsuspend()
3358 
3359       // get current set of blocked signals and unblock resume signal
3360       pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3361       sigdelset(&suspend_set, ASYNC_SIGNAL);
3362 
3363       sr_semaphore.signal();
3364       // wait here until we are resumed
3365       while (1) {
3366         sigsuspend(&suspend_set);
3367 
3368         os::SuspendResume::State result = osthread->sr.running();
3369         if (result == os::SuspendResume::SR_RUNNING) {
3370           sr_semaphore.signal();
3371           break;
3372         }
3373       }
3374 
3375     } else if (state == os::SuspendResume::SR_RUNNING) {
3376       // request was cancelled, continue
3377     } else {
3378       ShouldNotReachHere();
3379     }
3380 
3381     resume_clear_context(osthread);
3382   } else if (current == os::SuspendResume::SR_RUNNING) {
3383     // request was cancelled, continue
3384   } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3385     // ignore
3386   } else {
3387     // ignore
3388   }
3389 
3390   errno = old_errno;
3391 }
3392 
3393 void os::print_statistics() {
3394 }
3395 
3396 bool os::message_box(const char* title, const char* message) {
3397   int i;
3398   fdStream err(defaultStream::error_fd());
3399   for (i = 0; i < 78; i++) err.print_raw("=");
3400   err.cr();
3401   err.print_raw_cr(title);
3402   for (i = 0; i < 78; i++) err.print_raw("-");
3403   err.cr();
3404   err.print_raw_cr(message);
3405   for (i = 0; i < 78; i++) err.print_raw("=");
3406   err.cr();
3407 
3408   char buf[16];
3409   // Prevent process from exiting upon "read error" without consuming all CPU
3410   while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3411 
3412   return buf[0] == 'y' || buf[0] == 'Y';
3413 }
3414 
3415 static int sr_notify(OSThread* osthread) {
3416   int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3417   assert_status(status == 0, status, "thr_kill");
3418   return status;
3419 }
3420 
3421 // "Randomly" selected value for how long we want to spin
3422 // before bailing out on suspending a thread, also how often
3423 // we send a signal to a thread we want to resume
3424 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3425 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3426 
3427 static bool do_suspend(OSThread* osthread) {
3428   assert(osthread->sr.is_running(), "thread should be running");
3429   assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3430 
3431   // mark as suspended and send signal
3432   if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3433     // failed to switch, state wasn't running?
3434     ShouldNotReachHere();
3435     return false;
3436   }
3437 
3438   if (sr_notify(osthread) != 0) {
3439     ShouldNotReachHere();
3440   }
3441 
3442   // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3443   while (true) {
3444     if (sr_semaphore.timedwait(2000)) {
3445       break;
3446     } else {
3447       // timeout
3448       os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3449       if (cancelled == os::SuspendResume::SR_RUNNING) {
3450         return false;
3451       } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3452         // make sure that we consume the signal on the semaphore as well
3453         sr_semaphore.wait();
3454         break;
3455       } else {
3456         ShouldNotReachHere();
3457         return false;
3458       }
3459     }
3460   }
3461 
3462   guarantee(osthread->sr.is_suspended(), "Must be suspended");
3463   return true;
3464 }
3465 
3466 static void do_resume(OSThread* osthread) {
3467   assert(osthread->sr.is_suspended(), "thread should be suspended");
3468   assert(!sr_semaphore.trywait(), "invalid semaphore state");
3469 
3470   if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3471     // failed to switch to WAKEUP_REQUEST
3472     ShouldNotReachHere();
3473     return;
3474   }
3475 
3476   while (true) {
3477     if (sr_notify(osthread) == 0) {
3478       if (sr_semaphore.timedwait(2)) {
3479         if (osthread->sr.is_running()) {
3480           return;
3481         }
3482       }
3483     } else {
3484       ShouldNotReachHere();
3485     }
3486   }
3487 
3488   guarantee(osthread->sr.is_running(), "Must be running!");
3489 }
3490 
3491 void os::SuspendedThreadTask::internal_do_task() {
3492   if (do_suspend(_thread->osthread())) {
3493     SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3494     do_task(context);
3495     do_resume(_thread->osthread());
3496   }
3497 }
3498 
3499 // This does not do anything on Solaris. This is basically a hook for being
3500 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3501 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3502                               const methodHandle& method, JavaCallArguments* args,
3503                               Thread* thread) {
3504   f(value, method, args, thread);
3505 }
3506 
3507 // This routine may be used by user applications as a "hook" to catch signals.
3508 // The user-defined signal handler must pass unrecognized signals to this
3509 // routine, and if it returns true (non-zero), then the signal handler must
3510 // return immediately.  If the flag "abort_if_unrecognized" is true, then this
3511 // routine will never retun false (zero), but instead will execute a VM panic
3512 // routine kill the process.
3513 //
3514 // If this routine returns false, it is OK to call it again.  This allows
3515 // the user-defined signal handler to perform checks either before or after
3516 // the VM performs its own checks.  Naturally, the user code would be making
3517 // a serious error if it tried to handle an exception (such as a null check
3518 // or breakpoint) that the VM was generating for its own correct operation.
3519 //
3520 // This routine may recognize any of the following kinds of signals:
3521 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3522 // ASYNC_SIGNAL.
3523 // It should be consulted by handlers for any of those signals.
3524 //
3525 // The caller of this routine must pass in the three arguments supplied
3526 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3527 // field of the structure passed to sigaction().  This routine assumes that
3528 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3529 //
3530 // Note that the VM will print warnings if it detects conflicting signal
3531 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3532 //
3533 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3534                                                    siginfo_t* siginfo,
3535                                                    void* ucontext,
3536                                                    int abort_if_unrecognized);
3537 
3538 
3539 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3540   int orig_errno = errno;  // Preserve errno value over signal handler.
3541   JVM_handle_solaris_signal(sig, info, ucVoid, true);
3542   errno = orig_errno;
3543 }
3544 
3545 // This boolean allows users to forward their own non-matching signals
3546 // to JVM_handle_solaris_signal, harmlessly.
3547 bool os::Solaris::signal_handlers_are_installed = false;
3548 
3549 // For signal-chaining
3550 bool os::Solaris::libjsig_is_loaded = false;
3551 typedef struct sigaction *(*get_signal_t)(int);
3552 get_signal_t os::Solaris::get_signal_action = NULL;
3553 
3554 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3555   struct sigaction *actp = NULL;
3556 
3557   if ((libjsig_is_loaded)  && (sig <= Maxsignum)) {
3558     // Retrieve the old signal handler from libjsig
3559     actp = (*get_signal_action)(sig);
3560   }
3561   if (actp == NULL) {
3562     // Retrieve the preinstalled signal handler from jvm
3563     actp = get_preinstalled_handler(sig);
3564   }
3565 
3566   return actp;
3567 }
3568 
3569 static bool call_chained_handler(struct sigaction *actp, int sig,
3570                                  siginfo_t *siginfo, void *context) {
3571   // Call the old signal handler
3572   if (actp->sa_handler == SIG_DFL) {
3573     // It's more reasonable to let jvm treat it as an unexpected exception
3574     // instead of taking the default action.
3575     return false;
3576   } else if (actp->sa_handler != SIG_IGN) {
3577     if ((actp->sa_flags & SA_NODEFER) == 0) {
3578       // automaticlly block the signal
3579       sigaddset(&(actp->sa_mask), sig);
3580     }
3581 
3582     sa_handler_t hand;
3583     sa_sigaction_t sa;
3584     bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3585     // retrieve the chained handler
3586     if (siginfo_flag_set) {
3587       sa = actp->sa_sigaction;
3588     } else {
3589       hand = actp->sa_handler;
3590     }
3591 
3592     if ((actp->sa_flags & SA_RESETHAND) != 0) {
3593       actp->sa_handler = SIG_DFL;
3594     }
3595 
3596     // try to honor the signal mask
3597     sigset_t oset;
3598     pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3599 
3600     // call into the chained handler
3601     if (siginfo_flag_set) {
3602       (*sa)(sig, siginfo, context);
3603     } else {
3604       (*hand)(sig);
3605     }
3606 
3607     // restore the signal mask
3608     pthread_sigmask(SIG_SETMASK, &oset, 0);
3609   }
3610   // Tell jvm's signal handler the signal is taken care of.
3611   return true;
3612 }
3613 
3614 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3615   bool chained = false;
3616   // signal-chaining
3617   if (UseSignalChaining) {
3618     struct sigaction *actp = get_chained_signal_action(sig);
3619     if (actp != NULL) {
3620       chained = call_chained_handler(actp, sig, siginfo, context);
3621     }
3622   }
3623   return chained;
3624 }
3625 
3626 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3627   assert((chainedsigactions != (struct sigaction *)NULL) &&
3628          (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3629   if (preinstalled_sigs[sig] != 0) {
3630     return &chainedsigactions[sig];
3631   }
3632   return NULL;
3633 }
3634 
3635 void os::Solaris::save_preinstalled_handler(int sig,
3636                                             struct sigaction& oldAct) {
3637   assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3638   assert((chainedsigactions != (struct sigaction *)NULL) &&
3639          (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3640   chainedsigactions[sig] = oldAct;
3641   preinstalled_sigs[sig] = 1;
3642 }
3643 
3644 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3645                                      bool oktochain) {
3646   // Check for overwrite.
3647   struct sigaction oldAct;
3648   sigaction(sig, (struct sigaction*)NULL, &oldAct);
3649   void* oldhand =
3650       oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*,  oldAct.sa_sigaction)
3651                           : CAST_FROM_FN_PTR(void*,  oldAct.sa_handler);
3652   if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3653       oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3654       oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3655     if (AllowUserSignalHandlers || !set_installed) {
3656       // Do not overwrite; user takes responsibility to forward to us.
3657       return;
3658     } else if (UseSignalChaining) {
3659       if (oktochain) {
3660         // save the old handler in jvm
3661         save_preinstalled_handler(sig, oldAct);
3662       } else {
3663         vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3664       }
3665       // libjsig also interposes the sigaction() call below and saves the
3666       // old sigaction on it own.
3667     } else {
3668       fatal("Encountered unexpected pre-existing sigaction handler "
3669             "%#lx for signal %d.", (long)oldhand, sig);
3670     }
3671   }
3672 
3673   struct sigaction sigAct;
3674   sigfillset(&(sigAct.sa_mask));
3675   sigAct.sa_handler = SIG_DFL;
3676 
3677   sigAct.sa_sigaction = signalHandler;
3678   // Handle SIGSEGV on alternate signal stack if
3679   // not using stack banging
3680   if (!UseStackBanging && sig == SIGSEGV) {
3681     sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3682   } else {
3683     sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3684   }
3685   os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3686 
3687   sigaction(sig, &sigAct, &oldAct);
3688 
3689   void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3690                                        : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3691   assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3692 }
3693 
3694 
3695 #define DO_SIGNAL_CHECK(sig)                      \
3696   do {                                            \
3697     if (!sigismember(&check_signal_done, sig)) {  \
3698       os::Solaris::check_signal_handler(sig);     \
3699     }                                             \
3700   } while (0)
3701 
3702 // This method is a periodic task to check for misbehaving JNI applications
3703 // under CheckJNI, we can add any periodic checks here
3704 
3705 void os::run_periodic_checks() {
3706   // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3707   // thereby preventing a NULL checks.
3708   if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3709 
3710   if (check_signals == false) return;
3711 
3712   // SEGV and BUS if overridden could potentially prevent
3713   // generation of hs*.log in the event of a crash, debugging
3714   // such a case can be very challenging, so we absolutely
3715   // check for the following for a good measure:
3716   DO_SIGNAL_CHECK(SIGSEGV);
3717   DO_SIGNAL_CHECK(SIGILL);
3718   DO_SIGNAL_CHECK(SIGFPE);
3719   DO_SIGNAL_CHECK(SIGBUS);
3720   DO_SIGNAL_CHECK(SIGPIPE);
3721   DO_SIGNAL_CHECK(SIGXFSZ);
3722   DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3723 
3724   // ReduceSignalUsage allows the user to override these handlers
3725   // see comments at the very top and jvm_solaris.h
3726   if (!ReduceSignalUsage) {
3727     DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3728     DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3729     DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3730     DO_SIGNAL_CHECK(BREAK_SIGNAL);
3731   }
3732 }
3733 
3734 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3735 
3736 static os_sigaction_t os_sigaction = NULL;
3737 
3738 void os::Solaris::check_signal_handler(int sig) {
3739   char buf[O_BUFLEN];
3740   address jvmHandler = NULL;
3741 
3742   struct sigaction act;
3743   if (os_sigaction == NULL) {
3744     // only trust the default sigaction, in case it has been interposed
3745     os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3746     if (os_sigaction == NULL) return;
3747   }
3748 
3749   os_sigaction(sig, (struct sigaction*)NULL, &act);
3750 
3751   address thisHandler = (act.sa_flags & SA_SIGINFO)
3752     ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3753     : CAST_FROM_FN_PTR(address, act.sa_handler);
3754 
3755 
3756   switch (sig) {
3757   case SIGSEGV:
3758   case SIGBUS:
3759   case SIGFPE:
3760   case SIGPIPE:
3761   case SIGXFSZ:
3762   case SIGILL:
3763   case ASYNC_SIGNAL:
3764     jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3765     break;
3766 
3767   case SHUTDOWN1_SIGNAL:
3768   case SHUTDOWN2_SIGNAL:
3769   case SHUTDOWN3_SIGNAL:
3770   case BREAK_SIGNAL:
3771     jvmHandler = (address)user_handler();
3772     break;
3773 
3774   default:
3775       return;
3776   }
3777 
3778   if (thisHandler != jvmHandler) {
3779     tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3780     tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3781     tty->print_cr("  found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3782     // No need to check this sig any longer
3783     sigaddset(&check_signal_done, sig);
3784     // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3785     if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3786       tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3787                     exception_name(sig, buf, O_BUFLEN));
3788     }
3789   } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3790     tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3791     tty->print("expected:");
3792     os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3793     tty->cr();
3794     tty->print("  found:");
3795     os::Posix::print_sa_flags(tty, act.sa_flags);
3796     tty->cr();
3797     // No need to check this sig any longer
3798     sigaddset(&check_signal_done, sig);
3799   }
3800 
3801   // Print all the signal handler state
3802   if (sigismember(&check_signal_done, sig)) {
3803     print_signal_handlers(tty, buf, O_BUFLEN);
3804   }
3805 
3806 }
3807 
3808 void os::Solaris::install_signal_handlers() {
3809   signal_handlers_are_installed = true;
3810 
3811   // signal-chaining
3812   typedef void (*signal_setting_t)();
3813   signal_setting_t begin_signal_setting = NULL;
3814   signal_setting_t end_signal_setting = NULL;
3815   begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3816                                         dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3817   if (begin_signal_setting != NULL) {
3818     end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3819                                         dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3820     get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3821                                        dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3822     libjsig_is_loaded = true;
3823     assert(UseSignalChaining, "should enable signal-chaining");
3824   }
3825   if (libjsig_is_loaded) {
3826     // Tell libjsig jvm is setting signal handlers
3827     (*begin_signal_setting)();
3828   }
3829 
3830   set_signal_handler(SIGSEGV, true, true);
3831   set_signal_handler(SIGPIPE, true, true);
3832   set_signal_handler(SIGXFSZ, true, true);
3833   set_signal_handler(SIGBUS, true, true);
3834   set_signal_handler(SIGILL, true, true);
3835   set_signal_handler(SIGFPE, true, true);
3836   set_signal_handler(ASYNC_SIGNAL, true, true);
3837 
3838   if (libjsig_is_loaded) {
3839     // Tell libjsig jvm finishes setting signal handlers
3840     (*end_signal_setting)();
3841   }
3842 
3843   // We don't activate signal checker if libjsig is in place, we trust ourselves
3844   // and if UserSignalHandler is installed all bets are off.
3845   // Log that signal checking is off only if -verbose:jni is specified.
3846   if (CheckJNICalls) {
3847     if (libjsig_is_loaded) {
3848       if (PrintJNIResolving) {
3849         tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3850       }
3851       check_signals = false;
3852     }
3853     if (AllowUserSignalHandlers) {
3854       if (PrintJNIResolving) {
3855         tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3856       }
3857       check_signals = false;
3858     }
3859   }
3860 }
3861 
3862 
3863 void report_error(const char* file_name, int line_no, const char* title,
3864                   const char* format, ...);
3865 
3866 // (Static) wrappers for the liblgrp API
3867 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
3868 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
3869 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
3870 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
3871 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
3872 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
3873 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
3874 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
3875 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
3876 
3877 static address resolve_symbol_lazy(const char* name) {
3878   address addr = (address) dlsym(RTLD_DEFAULT, name);
3879   if (addr == NULL) {
3880     // RTLD_DEFAULT was not defined on some early versions of 2.5.1
3881     addr = (address) dlsym(RTLD_NEXT, name);
3882   }
3883   return addr;
3884 }
3885 
3886 static address resolve_symbol(const char* name) {
3887   address addr = resolve_symbol_lazy(name);
3888   if (addr == NULL) {
3889     fatal(dlerror());
3890   }
3891   return addr;
3892 }
3893 
3894 void os::Solaris::libthread_init() {
3895   address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
3896 
3897   lwp_priocntl_init();
3898 
3899   // RTLD_DEFAULT was not defined on some early versions of 5.5.1
3900   if (func == NULL) {
3901     func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
3902     // Guarantee that this VM is running on an new enough OS (5.6 or
3903     // later) that it will have a new enough libthread.so.
3904     guarantee(func != NULL, "libthread.so is too old.");
3905   }
3906 
3907   int size;
3908   void (*handler_info_func)(address *, int *);
3909   handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
3910   handler_info_func(&handler_start, &size);
3911   handler_end = handler_start + size;
3912 }
3913 
3914 
3915 int_fnP_mutex_tP os::Solaris::_mutex_lock;
3916 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
3917 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
3918 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
3919 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
3920 int os::Solaris::_mutex_scope = USYNC_THREAD;
3921 
3922 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
3923 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
3924 int_fnP_cond_tP os::Solaris::_cond_signal;
3925 int_fnP_cond_tP os::Solaris::_cond_broadcast;
3926 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
3927 int_fnP_cond_tP os::Solaris::_cond_destroy;
3928 int os::Solaris::_cond_scope = USYNC_THREAD;
3929 bool os::Solaris::_synchronization_initialized;
3930 
3931 void os::Solaris::synchronization_init() {
3932   if (UseLWPSynchronization) {
3933     os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
3934     os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
3935     os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
3936     os::Solaris::set_mutex_init(lwp_mutex_init);
3937     os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
3938     os::Solaris::set_mutex_scope(USYNC_THREAD);
3939 
3940     os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
3941     os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
3942     os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
3943     os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
3944     os::Solaris::set_cond_init(lwp_cond_init);
3945     os::Solaris::set_cond_destroy(lwp_cond_destroy);
3946     os::Solaris::set_cond_scope(USYNC_THREAD);
3947   } else {
3948     os::Solaris::set_mutex_scope(USYNC_THREAD);
3949     os::Solaris::set_cond_scope(USYNC_THREAD);
3950 
3951     if (UsePthreads) {
3952       os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
3953       os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
3954       os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
3955       os::Solaris::set_mutex_init(pthread_mutex_default_init);
3956       os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
3957 
3958       os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
3959       os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
3960       os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
3961       os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
3962       os::Solaris::set_cond_init(pthread_cond_default_init);
3963       os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
3964     } else {
3965       os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
3966       os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
3967       os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
3968       os::Solaris::set_mutex_init(::mutex_init);
3969       os::Solaris::set_mutex_destroy(::mutex_destroy);
3970 
3971       os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
3972       os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
3973       os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
3974       os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
3975       os::Solaris::set_cond_init(::cond_init);
3976       os::Solaris::set_cond_destroy(::cond_destroy);
3977     }
3978   }
3979   _synchronization_initialized = true;
3980 }
3981 
3982 bool os::Solaris::liblgrp_init() {
3983   void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
3984   if (handle != NULL) {
3985     os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
3986     os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
3987     os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
3988     os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
3989     os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
3990     os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
3991     os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
3992     os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
3993                                                       dlsym(handle, "lgrp_cookie_stale")));
3994 
3995     lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
3996     set_lgrp_cookie(c);
3997     return true;
3998   }
3999   return false;
4000 }
4001 
4002 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4003 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4004 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4005 
4006 void init_pset_getloadavg_ptr(void) {
4007   pset_getloadavg_ptr =
4008     (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4009   if (pset_getloadavg_ptr == NULL) {
4010     log_warning(os)("pset_getloadavg function not found");
4011   }
4012 }
4013 
4014 int os::Solaris::_dev_zero_fd = -1;
4015 
4016 // this is called _before_ the global arguments have been parsed
4017 void os::init(void) {
4018   _initial_pid = getpid();
4019 
4020   max_hrtime = first_hrtime = gethrtime();
4021 
4022   init_random(1234567);
4023 
4024   page_size = sysconf(_SC_PAGESIZE);
4025   if (page_size == -1) {
4026     fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4027   }
4028   init_page_sizes((size_t) page_size);
4029 
4030   Solaris::initialize_system_info();
4031 
4032   int fd = ::open("/dev/zero", O_RDWR);
4033   if (fd < 0) {
4034     fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4035   } else {
4036     Solaris::set_dev_zero_fd(fd);
4037 
4038     // Close on exec, child won't inherit.
4039     fcntl(fd, F_SETFD, FD_CLOEXEC);
4040   }
4041 
4042   clock_tics_per_sec = CLK_TCK;
4043 
4044   // check if dladdr1() exists; dladdr1 can provide more information than
4045   // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4046   // and is available on linker patches for 5.7 and 5.8.
4047   // libdl.so must have been loaded, this call is just an entry lookup
4048   void * hdl = dlopen("libdl.so", RTLD_NOW);
4049   if (hdl) {
4050     dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4051   }
4052 
4053   // main_thread points to the thread that created/loaded the JVM.
4054   main_thread = thr_self();
4055 
4056   // dynamic lookup of functions that may not be available in our lowest
4057   // supported Solaris release
4058   void * handle = dlopen("libc.so.1", RTLD_LAZY);
4059   if (handle != NULL) {
4060     Solaris::_pthread_setname_np =  // from 11.3
4061         (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4062   }
4063 
4064   // Shared Posix initialization
4065   os::Posix::init();
4066 }
4067 
4068 // To install functions for atexit system call
4069 extern "C" {
4070   static void perfMemory_exit_helper() {
4071     perfMemory_exit();
4072   }
4073 }
4074 
4075 // this is called _after_ the global arguments have been parsed
4076 jint os::init_2(void) {
4077   // try to enable extended file IO ASAP, see 6431278
4078   os::Solaris::try_enable_extended_io();
4079 
4080   // Check and sets minimum stack sizes against command line options
4081   if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4082     return JNI_ERR;
4083   }
4084 
4085   Solaris::libthread_init();
4086 
4087   if (UseNUMA) {
4088     if (!Solaris::liblgrp_init()) {
4089       UseNUMA = false;
4090     } else {
4091       size_t lgrp_limit = os::numa_get_groups_num();
4092       int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4093       size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4094       FREE_C_HEAP_ARRAY(int, lgrp_ids);
4095       if (lgrp_num < 2) {
4096         // There's only one locality group, disable NUMA.
4097         UseNUMA = false;
4098       }
4099     }
4100     if (!UseNUMA && ForceNUMA) {
4101       UseNUMA = true;
4102     }
4103   }
4104 
4105   Solaris::signal_sets_init();
4106   Solaris::init_signal_mem();
4107   Solaris::install_signal_handlers();
4108   // Initialize data for jdk.internal.misc.Signal
4109   if (!ReduceSignalUsage) {
4110     jdk_misc_signal_init();
4111   }
4112 
4113   // initialize synchronization primitives to use either thread or
4114   // lwp synchronization (controlled by UseLWPSynchronization)
4115   Solaris::synchronization_init();
4116   DEBUG_ONLY(os::set_mutex_init_done();)
4117 
4118   if (MaxFDLimit) {
4119     // set the number of file descriptors to max. print out error
4120     // if getrlimit/setrlimit fails but continue regardless.
4121     struct rlimit nbr_files;
4122     int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4123     if (status != 0) {
4124       log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4125     } else {
4126       nbr_files.rlim_cur = nbr_files.rlim_max;
4127       status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4128       if (status != 0) {
4129         log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4130       }
4131     }
4132   }
4133 
4134   // Calculate theoretical max. size of Threads to guard gainst
4135   // artifical out-of-memory situations, where all available address-
4136   // space has been reserved by thread stacks. Default stack size is 1Mb.
4137   size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4138     JavaThread::stack_size_at_create() : (1*K*K);
4139   assert(pre_thread_stack_size != 0, "Must have a stack");
4140   // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4141   // we should start doing Virtual Memory banging. Currently when the threads will
4142   // have used all but 200Mb of space.
4143   size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4144   Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4145 
4146   // at-exit methods are called in the reverse order of their registration.
4147   // In Solaris 7 and earlier, atexit functions are called on return from
4148   // main or as a result of a call to exit(3C). There can be only 32 of
4149   // these functions registered and atexit() does not set errno. In Solaris
4150   // 8 and later, there is no limit to the number of functions registered
4151   // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4152   // functions are called upon dlclose(3DL) in addition to return from main
4153   // and exit(3C).
4154 
4155   if (PerfAllowAtExitRegistration) {
4156     // only register atexit functions if PerfAllowAtExitRegistration is set.
4157     // atexit functions can be delayed until process exit time, which
4158     // can be problematic for embedded VM situations. Embedded VMs should
4159     // call DestroyJavaVM() to assure that VM resources are released.
4160 
4161     // note: perfMemory_exit_helper atexit function may be removed in
4162     // the future if the appropriate cleanup code can be added to the
4163     // VM_Exit VMOperation's doit method.
4164     if (atexit(perfMemory_exit_helper) != 0) {
4165       warning("os::init2 atexit(perfMemory_exit_helper) failed");
4166     }
4167   }
4168 
4169   // Init pset_loadavg function pointer
4170   init_pset_getloadavg_ptr();
4171 
4172   // Shared Posix initialization
4173   os::Posix::init_2();
4174 
4175   return JNI_OK;
4176 }
4177 
4178 // Mark the polling page as unreadable
4179 void os::make_polling_page_unreadable(void) {
4180   Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_NONE", p2i(_polling_page));
4181   if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4182     fatal("Could not disable polling page");
4183   }
4184 }
4185 
4186 // Mark the polling page as readable
4187 void os::make_polling_page_readable(void) {
4188   Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_READ", p2i(_polling_page));
4189   if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4190     fatal("Could not enable polling page");
4191   }
4192 }
4193 
4194 // Is a (classpath) directory empty?
4195 bool os::dir_is_empty(const char* path) {
4196   DIR *dir = NULL;
4197   struct dirent *ptr;
4198 
4199   dir = opendir(path);
4200   if (dir == NULL) return true;
4201 
4202   // Scan the directory
4203   bool result = true;
4204   while (result && (ptr = readdir(dir)) != NULL) {
4205     if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4206       result = false;
4207     }
4208   }
4209   closedir(dir);
4210   return result;
4211 }
4212 
4213 // This code originates from JDK's sysOpen and open64_w
4214 // from src/solaris/hpi/src/system_md.c
4215 
4216 int os::open(const char *path, int oflag, int mode) {
4217   if (strlen(path) > MAX_PATH - 1) {
4218     errno = ENAMETOOLONG;
4219     return -1;
4220   }
4221   int fd;
4222 
4223   fd = ::open64(path, oflag, mode);
4224   if (fd == -1) return -1;
4225 
4226   // If the open succeeded, the file might still be a directory
4227   {
4228     struct stat64 buf64;
4229     int ret = ::fstat64(fd, &buf64);
4230     int st_mode = buf64.st_mode;
4231 
4232     if (ret != -1) {
4233       if ((st_mode & S_IFMT) == S_IFDIR) {
4234         errno = EISDIR;
4235         ::close(fd);
4236         return -1;
4237       }
4238     } else {
4239       ::close(fd);
4240       return -1;
4241     }
4242   }
4243 
4244   // 32-bit Solaris systems suffer from:
4245   //
4246   // - an historical default soft limit of 256 per-process file
4247   //   descriptors that is too low for many Java programs.
4248   //
4249   // - a design flaw where file descriptors created using stdio
4250   //   fopen must be less than 256, _even_ when the first limit above
4251   //   has been raised.  This can cause calls to fopen (but not calls to
4252   //   open, for example) to fail mysteriously, perhaps in 3rd party
4253   //   native code (although the JDK itself uses fopen).  One can hardly
4254   //   criticize them for using this most standard of all functions.
4255   //
4256   // We attempt to make everything work anyways by:
4257   //
4258   // - raising the soft limit on per-process file descriptors beyond
4259   //   256
4260   //
4261   // - As of Solaris 10u4, we can request that Solaris raise the 256
4262   //   stdio fopen limit by calling function enable_extended_FILE_stdio.
4263   //   This is done in init_2 and recorded in enabled_extended_FILE_stdio
4264   //
4265   // - If we are stuck on an old (pre 10u4) Solaris system, we can
4266   //   workaround the bug by remapping non-stdio file descriptors below
4267   //   256 to ones beyond 256, which is done below.
4268   //
4269   // See:
4270   // 1085341: 32-bit stdio routines should support file descriptors >255
4271   // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4272   // 6431278: Netbeans crash on 32 bit Solaris: need to call
4273   //          enable_extended_FILE_stdio() in VM initialisation
4274   // Giri Mandalika's blog
4275   // http://technopark02.blogspot.com/2005_05_01_archive.html
4276   //
4277 #ifndef  _LP64
4278   if ((!enabled_extended_FILE_stdio) && fd < 256) {
4279     int newfd = ::fcntl(fd, F_DUPFD, 256);
4280     if (newfd != -1) {
4281       ::close(fd);
4282       fd = newfd;
4283     }
4284   }
4285 #endif // 32-bit Solaris
4286 
4287   // All file descriptors that are opened in the JVM and not
4288   // specifically destined for a subprocess should have the
4289   // close-on-exec flag set.  If we don't set it, then careless 3rd
4290   // party native code might fork and exec without closing all
4291   // appropriate file descriptors (e.g. as we do in closeDescriptors in
4292   // UNIXProcess.c), and this in turn might:
4293   //
4294   // - cause end-of-file to fail to be detected on some file
4295   //   descriptors, resulting in mysterious hangs, or
4296   //
4297   // - might cause an fopen in the subprocess to fail on a system
4298   //   suffering from bug 1085341.
4299   //
4300   // (Yes, the default setting of the close-on-exec flag is a Unix
4301   // design flaw)
4302   //
4303   // See:
4304   // 1085341: 32-bit stdio routines should support file descriptors >255
4305   // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4306   // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4307   //
4308 #ifdef FD_CLOEXEC
4309   {
4310     int flags = ::fcntl(fd, F_GETFD);
4311     if (flags != -1) {
4312       ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4313     }
4314   }
4315 #endif
4316 
4317   return fd;
4318 }
4319 
4320 // create binary file, rewriting existing file if required
4321 int os::create_binary_file(const char* path, bool rewrite_existing) {
4322   int oflags = O_WRONLY | O_CREAT;
4323   if (!rewrite_existing) {
4324     oflags |= O_EXCL;
4325   }
4326   return ::open64(path, oflags, S_IREAD | S_IWRITE);
4327 }
4328 
4329 // return current position of file pointer
4330 jlong os::current_file_offset(int fd) {
4331   return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4332 }
4333 
4334 // move file pointer to the specified offset
4335 jlong os::seek_to_file_offset(int fd, jlong offset) {
4336   return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4337 }
4338 
4339 jlong os::lseek(int fd, jlong offset, int whence) {
4340   return (jlong) ::lseek64(fd, offset, whence);
4341 }
4342 
4343 int os::ftruncate(int fd, jlong length) {
4344   return ::ftruncate64(fd, length);
4345 }
4346 
4347 int os::fsync(int fd)  {
4348   RESTARTABLE_RETURN_INT(::fsync(fd));
4349 }
4350 
4351 int os::available(int fd, jlong *bytes) {
4352   assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4353          "Assumed _thread_in_native");
4354   jlong cur, end;
4355   int mode;
4356   struct stat64 buf64;
4357 
4358   if (::fstat64(fd, &buf64) >= 0) {
4359     mode = buf64.st_mode;
4360     if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4361       int n,ioctl_return;
4362 
4363       RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4364       if (ioctl_return>= 0) {
4365         *bytes = n;
4366         return 1;
4367       }
4368     }
4369   }
4370   if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4371     return 0;
4372   } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4373     return 0;
4374   } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4375     return 0;
4376   }
4377   *bytes = end - cur;
4378   return 1;
4379 }
4380 
4381 // Map a block of memory.
4382 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4383                         char *addr, size_t bytes, bool read_only,
4384                         bool allow_exec) {
4385   int prot;
4386   int flags;
4387 
4388   if (read_only) {
4389     prot = PROT_READ;
4390     flags = MAP_SHARED;
4391   } else {
4392     prot = PROT_READ | PROT_WRITE;
4393     flags = MAP_PRIVATE;
4394   }
4395 
4396   if (allow_exec) {
4397     prot |= PROT_EXEC;
4398   }
4399 
4400   if (addr != NULL) {
4401     flags |= MAP_FIXED;
4402   }
4403 
4404   char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4405                                      fd, file_offset);
4406   if (mapped_address == MAP_FAILED) {
4407     return NULL;
4408   }
4409   return mapped_address;
4410 }
4411 
4412 
4413 // Remap a block of memory.
4414 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4415                           char *addr, size_t bytes, bool read_only,
4416                           bool allow_exec) {
4417   // same as map_memory() on this OS
4418   return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4419                         allow_exec);
4420 }
4421 
4422 
4423 // Unmap a block of memory.
4424 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4425   return munmap(addr, bytes) == 0;
4426 }
4427 
4428 void os::pause() {
4429   char filename[MAX_PATH];
4430   if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4431     jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4432   } else {
4433     jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4434   }
4435 
4436   int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4437   if (fd != -1) {
4438     struct stat buf;
4439     ::close(fd);
4440     while (::stat(filename, &buf) == 0) {
4441       (void)::poll(NULL, 0, 100);
4442     }
4443   } else {
4444     jio_fprintf(stderr,
4445                 "Could not open pause file '%s', continuing immediately.\n", filename);
4446   }
4447 }
4448 
4449 #ifndef PRODUCT
4450 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4451 // Turn this on if you need to trace synch operations.
4452 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4453 // and call record_synch_enable and record_synch_disable
4454 // around the computation of interest.
4455 
4456 void record_synch(char* name, bool returning);  // defined below
4457 
4458 class RecordSynch {
4459   char* _name;
4460  public:
4461   RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4462   ~RecordSynch()                       { record_synch(_name, true); }
4463 };
4464 
4465 #define CHECK_SYNCH_OP(ret, name, params, args, inner)          \
4466 extern "C" ret name params {                                    \
4467   typedef ret name##_t params;                                  \
4468   static name##_t* implem = NULL;                               \
4469   static int callcount = 0;                                     \
4470   if (implem == NULL) {                                         \
4471     implem = (name##_t*) dlsym(RTLD_NEXT, #name);               \
4472     if (implem == NULL)  fatal(dlerror());                      \
4473   }                                                             \
4474   ++callcount;                                                  \
4475   RecordSynch _rs(#name);                                       \
4476   inner;                                                        \
4477   return implem args;                                           \
4478 }
4479 // in dbx, examine callcounts this way:
4480 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4481 
4482 #define CHECK_POINTER_OK(p) \
4483   (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4484 #define CHECK_MU \
4485   if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4486 #define CHECK_CV \
4487   if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4488 #define CHECK_P(p) \
4489   if (!CHECK_POINTER_OK(p))  fatal(false,  "Pointer must be in C heap only.");
4490 
4491 #define CHECK_MUTEX(mutex_op) \
4492   CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4493 
4494 CHECK_MUTEX(   mutex_lock)
4495 CHECK_MUTEX(  _mutex_lock)
4496 CHECK_MUTEX( mutex_unlock)
4497 CHECK_MUTEX(_mutex_unlock)
4498 CHECK_MUTEX( mutex_trylock)
4499 CHECK_MUTEX(_mutex_trylock)
4500 
4501 #define CHECK_COND(cond_op) \
4502   CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4503 
4504 CHECK_COND( cond_wait);
4505 CHECK_COND(_cond_wait);
4506 CHECK_COND(_cond_wait_cancel);
4507 
4508 #define CHECK_COND2(cond_op) \
4509   CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4510 
4511 CHECK_COND2( cond_timedwait);
4512 CHECK_COND2(_cond_timedwait);
4513 CHECK_COND2(_cond_timedwait_cancel);
4514 
4515 // do the _lwp_* versions too
4516 #define mutex_t lwp_mutex_t
4517 #define cond_t  lwp_cond_t
4518 CHECK_MUTEX(  _lwp_mutex_lock)
4519 CHECK_MUTEX(  _lwp_mutex_unlock)
4520 CHECK_MUTEX(  _lwp_mutex_trylock)
4521 CHECK_MUTEX( __lwp_mutex_lock)
4522 CHECK_MUTEX( __lwp_mutex_unlock)
4523 CHECK_MUTEX( __lwp_mutex_trylock)
4524 CHECK_MUTEX(___lwp_mutex_lock)
4525 CHECK_MUTEX(___lwp_mutex_unlock)
4526 
4527 CHECK_COND(  _lwp_cond_wait);
4528 CHECK_COND( __lwp_cond_wait);
4529 CHECK_COND(___lwp_cond_wait);
4530 
4531 CHECK_COND2(  _lwp_cond_timedwait);
4532 CHECK_COND2( __lwp_cond_timedwait);
4533 #undef mutex_t
4534 #undef cond_t
4535 
4536 CHECK_SYNCH_OP(int, _lwp_suspend2,       (int lwp, int *n), (lwp, n), 0);
4537 CHECK_SYNCH_OP(int,__lwp_suspend2,       (int lwp, int *n), (lwp, n), 0);
4538 CHECK_SYNCH_OP(int, _lwp_kill,           (int lwp, int n),  (lwp, n), 0);
4539 CHECK_SYNCH_OP(int,__lwp_kill,           (int lwp, int n),  (lwp, n), 0);
4540 CHECK_SYNCH_OP(int, _lwp_sema_wait,      (lwp_sema_t* p),   (p),  CHECK_P(p));
4541 CHECK_SYNCH_OP(int,__lwp_sema_wait,      (lwp_sema_t* p),   (p),  CHECK_P(p));
4542 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv),  (cv), CHECK_CV);
4543 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv),  (cv), CHECK_CV);
4544 
4545 
4546 // recording machinery:
4547 
4548 enum { RECORD_SYNCH_LIMIT = 200 };
4549 char* record_synch_name[RECORD_SYNCH_LIMIT];
4550 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4551 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4552 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4553 int record_synch_count = 0;
4554 bool record_synch_enabled = false;
4555 
4556 // in dbx, examine recorded data this way:
4557 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4558 
4559 void record_synch(char* name, bool returning) {
4560   if (record_synch_enabled) {
4561     if (record_synch_count < RECORD_SYNCH_LIMIT) {
4562       record_synch_name[record_synch_count] = name;
4563       record_synch_returning[record_synch_count] = returning;
4564       record_synch_thread[record_synch_count] = thr_self();
4565       record_synch_arg0ptr[record_synch_count] = &name;
4566       record_synch_count++;
4567     }
4568     // put more checking code here:
4569     // ...
4570   }
4571 }
4572 
4573 void record_synch_enable() {
4574   // start collecting trace data, if not already doing so
4575   if (!record_synch_enabled)  record_synch_count = 0;
4576   record_synch_enabled = true;
4577 }
4578 
4579 void record_synch_disable() {
4580   // stop collecting trace data
4581   record_synch_enabled = false;
4582 }
4583 
4584 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4585 #endif // PRODUCT
4586 
4587 const intptr_t thr_time_off  = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4588 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4589                                (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4590 
4591 
4592 // JVMTI & JVM monitoring and management support
4593 // The thread_cpu_time() and current_thread_cpu_time() are only
4594 // supported if is_thread_cpu_time_supported() returns true.
4595 // They are not supported on Solaris T1.
4596 
4597 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4598 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4599 // of a thread.
4600 //
4601 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4602 // returns the fast estimate available on the platform.
4603 
4604 // hrtime_t gethrvtime() return value includes
4605 // user time but does not include system time
4606 jlong os::current_thread_cpu_time() {
4607   return (jlong) gethrvtime();
4608 }
4609 
4610 jlong os::thread_cpu_time(Thread *thread) {
4611   // return user level CPU time only to be consistent with
4612   // what current_thread_cpu_time returns.
4613   // thread_cpu_time_info() must be changed if this changes
4614   return os::thread_cpu_time(thread, false /* user time only */);
4615 }
4616 
4617 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4618   if (user_sys_cpu_time) {
4619     return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4620   } else {
4621     return os::current_thread_cpu_time();
4622   }
4623 }
4624 
4625 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4626   char proc_name[64];
4627   int count;
4628   prusage_t prusage;
4629   jlong lwp_time;
4630   int fd;
4631 
4632   sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4633           getpid(),
4634           thread->osthread()->lwp_id());
4635   fd = ::open(proc_name, O_RDONLY);
4636   if (fd == -1) return -1;
4637 
4638   do {
4639     count = ::pread(fd,
4640                     (void *)&prusage.pr_utime,
4641                     thr_time_size,
4642                     thr_time_off);
4643   } while (count < 0 && errno == EINTR);
4644   ::close(fd);
4645   if (count < 0) return -1;
4646 
4647   if (user_sys_cpu_time) {
4648     // user + system CPU time
4649     lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4650                  (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4651                  (jlong)prusage.pr_stime.tv_nsec +
4652                  (jlong)prusage.pr_utime.tv_nsec;
4653   } else {
4654     // user level CPU time only
4655     lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4656                 (jlong)prusage.pr_utime.tv_nsec;
4657   }
4658 
4659   return (lwp_time);
4660 }
4661 
4662 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4663   info_ptr->max_value = ALL_64_BITS;      // will not wrap in less than 64 bits
4664   info_ptr->may_skip_backward = false;    // elapsed time not wall time
4665   info_ptr->may_skip_forward = false;     // elapsed time not wall time
4666   info_ptr->kind = JVMTI_TIMER_USER_CPU;  // only user time is returned
4667 }
4668 
4669 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4670   info_ptr->max_value = ALL_64_BITS;      // will not wrap in less than 64 bits
4671   info_ptr->may_skip_backward = false;    // elapsed time not wall time
4672   info_ptr->may_skip_forward = false;     // elapsed time not wall time
4673   info_ptr->kind = JVMTI_TIMER_USER_CPU;  // only user time is returned
4674 }
4675 
4676 bool os::is_thread_cpu_time_supported() {
4677   return true;
4678 }
4679 
4680 // System loadavg support.  Returns -1 if load average cannot be obtained.
4681 // Return the load average for our processor set if the primitive exists
4682 // (Solaris 9 and later).  Otherwise just return system wide loadavg.
4683 int os::loadavg(double loadavg[], int nelem) {
4684   if (pset_getloadavg_ptr != NULL) {
4685     return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4686   } else {
4687     return ::getloadavg(loadavg, nelem);
4688   }
4689 }
4690 
4691 //---------------------------------------------------------------------------------
4692 
4693 bool os::find(address addr, outputStream* st) {
4694   Dl_info dlinfo;
4695   memset(&dlinfo, 0, sizeof(dlinfo));
4696   if (dladdr(addr, &dlinfo) != 0) {
4697     st->print(PTR_FORMAT ": ", addr);
4698     if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4699       st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4700     } else if (dlinfo.dli_fbase != NULL) {
4701       st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4702     } else {
4703       st->print("<absolute address>");
4704     }
4705     if (dlinfo.dli_fname != NULL) {
4706       st->print(" in %s", dlinfo.dli_fname);
4707     }
4708     if (dlinfo.dli_fbase != NULL) {
4709       st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4710     }
4711     st->cr();
4712 
4713     if (Verbose) {
4714       // decode some bytes around the PC
4715       address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4716       address end   = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4717       address       lowest = (address) dlinfo.dli_sname;
4718       if (!lowest)  lowest = (address) dlinfo.dli_fbase;
4719       if (begin < lowest)  begin = lowest;
4720       Dl_info dlinfo2;
4721       if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4722           && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4723         end = (address) dlinfo2.dli_saddr;
4724       }
4725       Disassembler::decode(begin, end, st);
4726     }
4727     return true;
4728   }
4729   return false;
4730 }
4731 
4732 // Following function has been added to support HotSparc's libjvm.so running
4733 // under Solaris production JDK 1.2.2 / 1.3.0.  These came from
4734 // src/solaris/hpi/native_threads in the EVM codebase.
4735 //
4736 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4737 // libraries and should thus be removed. We will leave it behind for a while
4738 // until we no longer want to able to run on top of 1.3.0 Solaris production
4739 // JDK. See 4341971.
4740 
4741 #define STACK_SLACK 0x800
4742 
4743 extern "C" {
4744   intptr_t sysThreadAvailableStackWithSlack() {
4745     stack_t st;
4746     intptr_t retval, stack_top;
4747     retval = thr_stksegment(&st);
4748     assert(retval == 0, "incorrect return value from thr_stksegment");
4749     assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4750     assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4751     stack_top=(intptr_t)st.ss_sp-st.ss_size;
4752     return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4753   }
4754 }
4755 
4756 // ObjectMonitor park-unpark infrastructure ...
4757 //
4758 // We implement Solaris and Linux PlatformEvents with the
4759 // obvious condvar-mutex-flag triple.
4760 // Another alternative that works quite well is pipes:
4761 // Each PlatformEvent consists of a pipe-pair.
4762 // The thread associated with the PlatformEvent
4763 // calls park(), which reads from the input end of the pipe.
4764 // Unpark() writes into the other end of the pipe.
4765 // The write-side of the pipe must be set NDELAY.
4766 // Unfortunately pipes consume a large # of handles.
4767 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4768 // Using pipes for the 1st few threads might be workable, however.
4769 //
4770 // park() is permitted to return spuriously.
4771 // Callers of park() should wrap the call to park() in
4772 // an appropriate loop.  A litmus test for the correct
4773 // usage of park is the following: if park() were modified
4774 // to immediately return 0 your code should still work,
4775 // albeit degenerating to a spin loop.
4776 //
4777 // In a sense, park()-unpark() just provides more polite spinning
4778 // and polling with the key difference over naive spinning being
4779 // that a parked thread needs to be explicitly unparked() in order
4780 // to wake up and to poll the underlying condition.
4781 //
4782 // Assumption:
4783 //    Only one parker can exist on an event, which is why we allocate
4784 //    them per-thread. Multiple unparkers can coexist.
4785 //
4786 // _Event transitions in park()
4787 //   -1 => -1 : illegal
4788 //    1 =>  0 : pass - return immediately
4789 //    0 => -1 : block; then set _Event to 0 before returning
4790 //
4791 // _Event transitions in unpark()
4792 //    0 => 1 : just return
4793 //    1 => 1 : just return
4794 //   -1 => either 0 or 1; must signal target thread
4795 //         That is, we can safely transition _Event from -1 to either
4796 //         0 or 1.
4797 //
4798 // _Event serves as a restricted-range semaphore.
4799 //   -1 : thread is blocked, i.e. there is a waiter
4800 //    0 : neutral: thread is running or ready,
4801 //        could have been signaled after a wait started
4802 //    1 : signaled - thread is running or ready
4803 //
4804 // Another possible encoding of _Event would be with
4805 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4806 //
4807 // TODO-FIXME: add DTRACE probes for:
4808 // 1.   Tx parks
4809 // 2.   Ty unparks Tx
4810 // 3.   Tx resumes from park
4811 
4812 
4813 // value determined through experimentation
4814 #define ROUNDINGFIX 11
4815 
4816 // utility to compute the abstime argument to timedwait.
4817 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4818 
4819 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4820   // millis is the relative timeout time
4821   // abstime will be the absolute timeout time
4822   if (millis < 0)  millis = 0;
4823   struct timeval now;
4824   int status = gettimeofday(&now, NULL);
4825   assert(status == 0, "gettimeofday");
4826   jlong seconds = millis / 1000;
4827   jlong max_wait_period;
4828 
4829   if (UseLWPSynchronization) {
4830     // forward port of fix for 4275818 (not sleeping long enough)
4831     // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4832     // _lwp_cond_timedwait() used a round_down algorithm rather
4833     // than a round_up. For millis less than our roundfactor
4834     // it rounded down to 0 which doesn't meet the spec.
4835     // For millis > roundfactor we may return a bit sooner, but
4836     // since we can not accurately identify the patch level and
4837     // this has already been fixed in Solaris 9 and 8 we will
4838     // leave it alone rather than always rounding down.
4839 
4840     if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4841     // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4842     // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4843     max_wait_period = 21000000;
4844   } else {
4845     max_wait_period = 50000000;
4846   }
4847   millis %= 1000;
4848   if (seconds > max_wait_period) {      // see man cond_timedwait(3T)
4849     seconds = max_wait_period;
4850   }
4851   abstime->tv_sec = now.tv_sec  + seconds;
4852   long       usec = now.tv_usec + millis * 1000;
4853   if (usec >= 1000000) {
4854     abstime->tv_sec += 1;
4855     usec -= 1000000;
4856   }
4857   abstime->tv_nsec = usec * 1000;
4858   return abstime;
4859 }
4860 
4861 void os::PlatformEvent::park() {           // AKA: down()
4862   // Transitions for _Event:
4863   //   -1 => -1 : illegal
4864   //    1 =>  0 : pass - return immediately
4865   //    0 => -1 : block; then set _Event to 0 before returning
4866 
4867   // Invariant: Only the thread associated with the Event/PlatformEvent
4868   // may call park().
4869   assert(_nParked == 0, "invariant");
4870 
4871   int v;
4872   for (;;) {
4873     v = _Event;
4874     if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4875   }
4876   guarantee(v >= 0, "invariant");
4877   if (v == 0) {
4878     // Do this the hard way by blocking ...
4879     // See http://monaco.sfbay/detail.jsf?cr=5094058.
4880     int status = os::Solaris::mutex_lock(_mutex);
4881     assert_status(status == 0, status, "mutex_lock");
4882     guarantee(_nParked == 0, "invariant");
4883     ++_nParked;
4884     while (_Event < 0) {
4885       // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4886       // Treat this the same as if the wait was interrupted
4887       // With usr/lib/lwp going to kernel, always handle ETIME
4888       status = os::Solaris::cond_wait(_cond, _mutex);
4889       if (status == ETIME) status = EINTR;
4890       assert_status(status == 0 || status == EINTR, status, "cond_wait");
4891     }
4892     --_nParked;
4893     _Event = 0;
4894     status = os::Solaris::mutex_unlock(_mutex);
4895     assert_status(status == 0, status, "mutex_unlock");
4896     // Paranoia to ensure our locked and lock-free paths interact
4897     // correctly with each other.
4898     OrderAccess::fence();
4899   }
4900 }
4901 
4902 int os::PlatformEvent::park(jlong millis) {
4903   // Transitions for _Event:
4904   //   -1 => -1 : illegal
4905   //    1 =>  0 : pass - return immediately
4906   //    0 => -1 : block; then set _Event to 0 before returning
4907 
4908   guarantee(_nParked == 0, "invariant");
4909   int v;
4910   for (;;) {
4911     v = _Event;
4912     if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4913   }
4914   guarantee(v >= 0, "invariant");
4915   if (v != 0) return OS_OK;
4916 
4917   int ret = OS_TIMEOUT;
4918   timestruc_t abst;
4919   compute_abstime(&abst, millis);
4920 
4921   // See http://monaco.sfbay/detail.jsf?cr=5094058.
4922   int status = os::Solaris::mutex_lock(_mutex);
4923   assert_status(status == 0, status, "mutex_lock");
4924   guarantee(_nParked == 0, "invariant");
4925   ++_nParked;
4926   while (_Event < 0) {
4927     int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
4928     assert_status(status == 0 || status == EINTR ||
4929                   status == ETIME || status == ETIMEDOUT,
4930                   status, "cond_timedwait");
4931     if (!FilterSpuriousWakeups) break;                // previous semantics
4932     if (status == ETIME || status == ETIMEDOUT) break;
4933     // We consume and ignore EINTR and spurious wakeups.
4934   }
4935   --_nParked;
4936   if (_Event >= 0) ret = OS_OK;
4937   _Event = 0;
4938   status = os::Solaris::mutex_unlock(_mutex);
4939   assert_status(status == 0, status, "mutex_unlock");
4940   // Paranoia to ensure our locked and lock-free paths interact
4941   // correctly with each other.
4942   OrderAccess::fence();
4943   return ret;
4944 }
4945 
4946 void os::PlatformEvent::unpark() {
4947   // Transitions for _Event:
4948   //    0 => 1 : just return
4949   //    1 => 1 : just return
4950   //   -1 => either 0 or 1; must signal target thread
4951   //         That is, we can safely transition _Event from -1 to either
4952   //         0 or 1.
4953   // See also: "Semaphores in Plan 9" by Mullender & Cox
4954   //
4955   // Note: Forcing a transition from "-1" to "1" on an unpark() means
4956   // that it will take two back-to-back park() calls for the owning
4957   // thread to block. This has the benefit of forcing a spurious return
4958   // from the first park() call after an unpark() call which will help
4959   // shake out uses of park() and unpark() without condition variables.
4960 
4961   if (Atomic::xchg(1, &_Event) >= 0) return;
4962 
4963   // If the thread associated with the event was parked, wake it.
4964   // Wait for the thread assoc with the PlatformEvent to vacate.
4965   int status = os::Solaris::mutex_lock(_mutex);
4966   assert_status(status == 0, status, "mutex_lock");
4967   int AnyWaiters = _nParked;
4968   status = os::Solaris::mutex_unlock(_mutex);
4969   assert_status(status == 0, status, "mutex_unlock");
4970   guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4971   if (AnyWaiters != 0) {
4972     // Note that we signal() *after* dropping the lock for "immortal" Events.
4973     // This is safe and avoids a common class of  futile wakeups.  In rare
4974     // circumstances this can cause a thread to return prematurely from
4975     // cond_{timed}wait() but the spurious wakeup is benign and the victim
4976     // will simply re-test the condition and re-park itself.
4977     // This provides particular benefit if the underlying platform does not
4978     // provide wait morphing.
4979     status = os::Solaris::cond_signal(_cond);
4980     assert_status(status == 0, status, "cond_signal");
4981   }
4982 }
4983 
4984 // JSR166
4985 // -------------------------------------------------------
4986 
4987 // The solaris and linux implementations of park/unpark are fairly
4988 // conservative for now, but can be improved. They currently use a
4989 // mutex/condvar pair, plus _counter.
4990 // Park decrements _counter if > 0, else does a condvar wait.  Unpark
4991 // sets count to 1 and signals condvar.  Only one thread ever waits
4992 // on the condvar. Contention seen when trying to park implies that someone
4993 // is unparking you, so don't wait. And spurious returns are fine, so there
4994 // is no need to track notifications.
4995 
4996 #define MAX_SECS 100000000
4997 
4998 // This code is common to linux and solaris and will be moved to a
4999 // common place in dolphin.
5000 //
5001 // The passed in time value is either a relative time in nanoseconds
5002 // or an absolute time in milliseconds. Either way it has to be unpacked
5003 // into suitable seconds and nanoseconds components and stored in the
5004 // given timespec structure.
5005 // Given time is a 64-bit value and the time_t used in the timespec is only
5006 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5007 // overflow if times way in the future are given. Further on Solaris versions
5008 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5009 // number of seconds, in abstime, is less than current_time  + 100,000,000.
5010 // As it will be 28 years before "now + 100000000" will overflow we can
5011 // ignore overflow and just impose a hard-limit on seconds using the value
5012 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5013 // years from "now".
5014 //
5015 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5016   assert(time > 0, "convertTime");
5017 
5018   struct timeval now;
5019   int status = gettimeofday(&now, NULL);
5020   assert(status == 0, "gettimeofday");
5021 
5022   time_t max_secs = now.tv_sec + MAX_SECS;
5023 
5024   if (isAbsolute) {
5025     jlong secs = time / 1000;
5026     if (secs > max_secs) {
5027       absTime->tv_sec = max_secs;
5028     } else {
5029       absTime->tv_sec = secs;
5030     }
5031     absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5032   } else {
5033     jlong secs = time / NANOSECS_PER_SEC;
5034     if (secs >= MAX_SECS) {
5035       absTime->tv_sec = max_secs;
5036       absTime->tv_nsec = 0;
5037     } else {
5038       absTime->tv_sec = now.tv_sec + secs;
5039       absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5040       if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5041         absTime->tv_nsec -= NANOSECS_PER_SEC;
5042         ++absTime->tv_sec; // note: this must be <= max_secs
5043       }
5044     }
5045   }
5046   assert(absTime->tv_sec >= 0, "tv_sec < 0");
5047   assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5048   assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5049   assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5050 }
5051 
5052 void Parker::park(bool isAbsolute, jlong time) {
5053   // Ideally we'd do something useful while spinning, such
5054   // as calling unpackTime().
5055 
5056   // Optional fast-path check:
5057   // Return immediately if a permit is available.
5058   // We depend on Atomic::xchg() having full barrier semantics
5059   // since we are doing a lock-free update to _counter.
5060   if (Atomic::xchg(0, &_counter) > 0) return;
5061 
5062   // Optional fast-exit: Check interrupt before trying to wait
5063   Thread* thread = Thread::current();
5064   assert(thread->is_Java_thread(), "Must be JavaThread");
5065   JavaThread *jt = (JavaThread *)thread;
5066   if (Thread::is_interrupted(thread, false)) {
5067     return;
5068   }
5069 
5070   // First, demultiplex/decode time arguments
5071   timespec absTime;
5072   if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5073     return;
5074   }
5075   if (time > 0) {
5076     // Warning: this code might be exposed to the old Solaris time
5077     // round-down bugs.  Grep "roundingFix" for details.
5078     unpackTime(&absTime, isAbsolute, time);
5079   }
5080 
5081   // Enter safepoint region
5082   // Beware of deadlocks such as 6317397.
5083   // The per-thread Parker:: _mutex is a classic leaf-lock.
5084   // In particular a thread must never block on the Threads_lock while
5085   // holding the Parker:: mutex.  If safepoints are pending both the
5086   // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5087   ThreadBlockInVM tbivm(jt);
5088 
5089   // Don't wait if cannot get lock since interference arises from
5090   // unblocking.  Also. check interrupt before trying wait
5091   if (Thread::is_interrupted(thread, false) ||
5092       os::Solaris::mutex_trylock(_mutex) != 0) {
5093     return;
5094   }
5095 
5096   int status;
5097 
5098   if (_counter > 0)  { // no wait needed
5099     _counter = 0;
5100     status = os::Solaris::mutex_unlock(_mutex);
5101     assert(status == 0, "invariant");
5102     // Paranoia to ensure our locked and lock-free paths interact
5103     // correctly with each other and Java-level accesses.
5104     OrderAccess::fence();
5105     return;
5106   }
5107 
5108   OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5109   jt->set_suspend_equivalent();
5110   // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5111 
5112   // Do this the hard way by blocking ...
5113   // See http://monaco.sfbay/detail.jsf?cr=5094058.
5114   if (time == 0) {
5115     status = os::Solaris::cond_wait(_cond, _mutex);
5116   } else {
5117     status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5118   }
5119   // Note that an untimed cond_wait() can sometimes return ETIME on older
5120   // versions of the Solaris.
5121   assert_status(status == 0 || status == EINTR ||
5122                 status == ETIME || status == ETIMEDOUT,
5123                 status, "cond_timedwait");
5124 
5125   _counter = 0;
5126   status = os::Solaris::mutex_unlock(_mutex);
5127   assert_status(status == 0, status, "mutex_unlock");
5128   // Paranoia to ensure our locked and lock-free paths interact
5129   // correctly with each other and Java-level accesses.
5130   OrderAccess::fence();
5131 
5132   // If externally suspended while waiting, re-suspend
5133   if (jt->handle_special_suspend_equivalent_condition()) {
5134     jt->java_suspend_self();
5135   }
5136 }
5137 
5138 void Parker::unpark() {
5139   int status = os::Solaris::mutex_lock(_mutex);
5140   assert(status == 0, "invariant");
5141   const int s = _counter;
5142   _counter = 1;
5143   status = os::Solaris::mutex_unlock(_mutex);
5144   assert(status == 0, "invariant");
5145 
5146   if (s < 1) {
5147     status = os::Solaris::cond_signal(_cond);
5148     assert(status == 0, "invariant");
5149   }
5150 }
5151 
5152 // Platform Mutex/Monitor implementations
5153 
5154 os::PlatformMutex::PlatformMutex() {
5155   int status = os::Solaris::mutex_init(&_mutex);
5156   assert_status(status == 0, status, "mutex_init");
5157 }
5158 
5159 os::PlatformMutex::~PlatformMutex() {
5160   int status = os::Solaris::mutex_destroy(&_mutex);
5161   assert_status(status == 0, status, "mutex_destroy");
5162 }
5163 
5164 void os::PlatformMutex::lock() {
5165   int status = os::Solaris::mutex_lock(&_mutex);
5166   assert_status(status == 0, status, "mutex_lock");
5167 }
5168 
5169 void os::PlatformMutex::unlock() {
5170   int status = os::Solaris::mutex_unlock(&_mutex);
5171   assert_status(status == 0, status, "mutex_unlock");
5172 }
5173 
5174 bool os::PlatformMutex::try_lock() {
5175   int status = os::Solaris::mutex_trylock(&_mutex);
5176   assert_status(status == 0 || status == EBUSY, status, "mutex_trylock");
5177   return status == 0;
5178 }
5179 
5180 os::PlatformMonitor::PlatformMonitor() {
5181   int status = os::Solaris::cond_init(&_cond);
5182   assert_status(status == 0, status, "cond_init");
5183 }
5184 
5185 os::PlatformMonitor::~PlatformMonitor() {
5186   int status = os::Solaris::cond_destroy(&_cond);
5187   assert_status(status == 0, status, "cond_destroy");
5188 }
5189 
5190 // Must already be locked
5191 int os::PlatformMonitor::wait(jlong millis) {
5192   assert(millis >= 0, "negative timeout");
5193   if (millis > 0) {
5194     timestruc_t abst;
5195     int ret = OS_TIMEOUT;
5196     compute_abstime(&abst, millis);
5197     int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst);
5198     assert_status(status == 0 || status == EINTR ||
5199                   status == ETIME || status == ETIMEDOUT,
5200                   status, "cond_timedwait");
5201     // EINTR acts as spurious wakeup - which is permitted anyway
5202     if (status == 0 || status == EINTR) {
5203       ret = OS_OK;
5204     }
5205     return ret;
5206   } else {
5207     int status = os::Solaris::cond_wait(&_cond, &_mutex);
5208     assert_status(status == 0 || status == EINTR,
5209                   status, "cond_wait");
5210     return OS_OK;
5211   }
5212 }
5213 
5214 void os::PlatformMonitor::notify() {
5215   int status = os::Solaris::cond_signal(&_cond);
5216   assert_status(status == 0, status, "cond_signal");
5217 }
5218 
5219 void os::PlatformMonitor::notify_all() {
5220   int status = os::Solaris::cond_broadcast(&_cond);
5221   assert_status(status == 0, status, "cond_broadcast");
5222 }
5223 
5224 extern char** environ;
5225 
5226 // Run the specified command in a separate process. Return its exit value,
5227 // or -1 on failure (e.g. can't fork a new process).
5228 // Unlike system(), this function can be called from signal handler. It
5229 // doesn't block SIGINT et al.
5230 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5231   char * argv[4];
5232   argv[0] = (char *)"sh";
5233   argv[1] = (char *)"-c";
5234   argv[2] = cmd;
5235   argv[3] = NULL;
5236 
5237   // fork is async-safe, fork1 is not so can't use in signal handler
5238   pid_t pid;
5239   Thread* t = Thread::current_or_null_safe();
5240   if (t != NULL && t->is_inside_signal_handler()) {
5241     pid = fork();
5242   } else {
5243     pid = fork1();
5244   }
5245 
5246   if (pid < 0) {
5247     // fork failed
5248     warning("fork failed: %s", os::strerror(errno));
5249     return -1;
5250 
5251   } else if (pid == 0) {
5252     // child process
5253 
5254     // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5255     execve("/usr/bin/sh", argv, environ);
5256 
5257     // execve failed
5258     _exit(-1);
5259 
5260   } else  {
5261     // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5262     // care about the actual exit code, for now.
5263 
5264     int status;
5265 
5266     // Wait for the child process to exit.  This returns immediately if
5267     // the child has already exited. */
5268     while (waitpid(pid, &status, 0) < 0) {
5269       switch (errno) {
5270       case ECHILD: return 0;
5271       case EINTR: break;
5272       default: return -1;
5273       }
5274     }
5275 
5276     if (WIFEXITED(status)) {
5277       // The child exited normally; get its exit code.
5278       return WEXITSTATUS(status);
5279     } else if (WIFSIGNALED(status)) {
5280       // The child exited because of a signal
5281       // The best value to return is 0x80 + signal number,
5282       // because that is what all Unix shells do, and because
5283       // it allows callers to distinguish between process exit and
5284       // process death by signal.
5285       return 0x80 + WTERMSIG(status);
5286     } else {
5287       // Unknown exit code; pass it through
5288       return status;
5289     }
5290   }
5291 }
5292 
5293 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5294   size_t res;
5295   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5296   return res;
5297 }
5298 
5299 int os::close(int fd) {
5300   return ::close(fd);
5301 }
5302 
5303 int os::socket_close(int fd) {
5304   return ::close(fd);
5305 }
5306 
5307 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5308   assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5309          "Assumed _thread_in_native");
5310   RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5311 }
5312 
5313 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5314   assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5315          "Assumed _thread_in_native");
5316   RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5317 }
5318 
5319 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5320   RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5321 }
5322 
5323 // As both poll and select can be interrupted by signals, we have to be
5324 // prepared to restart the system call after updating the timeout, unless
5325 // a poll() is done with timeout == -1, in which case we repeat with this
5326 // "wait forever" value.
5327 
5328 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5329   int _result;
5330   _result = ::connect(fd, him, len);
5331 
5332   // On Solaris, when a connect() call is interrupted, the connection
5333   // can be established asynchronously (see 6343810). Subsequent calls
5334   // to connect() must check the errno value which has the semantic
5335   // described below (copied from the connect() man page). Handling
5336   // of asynchronously established connections is required for both
5337   // blocking and non-blocking sockets.
5338   //     EINTR            The  connection  attempt  was   interrupted
5339   //                      before  any data arrived by the delivery of
5340   //                      a signal. The connection, however, will  be
5341   //                      established asynchronously.
5342   //
5343   //     EINPROGRESS      The socket is non-blocking, and the connec-
5344   //                      tion  cannot  be completed immediately.
5345   //
5346   //     EALREADY         The socket is non-blocking,  and a previous
5347   //                      connection  attempt  has  not yet been com-
5348   //                      pleted.
5349   //
5350   //     EISCONN          The socket is already connected.
5351   if (_result == OS_ERR && errno == EINTR) {
5352     // restarting a connect() changes its errno semantics
5353     RESTARTABLE(::connect(fd, him, len), _result);
5354     // undo these changes
5355     if (_result == OS_ERR) {
5356       if (errno == EALREADY) {
5357         errno = EINPROGRESS; // fall through
5358       } else if (errno == EISCONN) {
5359         errno = 0;
5360         return OS_OK;
5361       }
5362     }
5363   }
5364   return _result;
5365 }
5366 
5367 // Get the default path to the core file
5368 // Returns the length of the string
5369 int os::get_core_path(char* buffer, size_t bufferSize) {
5370   const char* p = get_current_directory(buffer, bufferSize);
5371 
5372   if (p == NULL) {
5373     assert(p != NULL, "failed to get current directory");
5374     return 0;
5375   }
5376 
5377   jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5378                                               p, current_process_id());
5379 
5380   return strlen(buffer);
5381 }
5382 
5383 bool os::supports_map_sync() {
5384   return false;
5385 }
5386 
5387 #ifndef PRODUCT
5388 void TestReserveMemorySpecial_test() {
5389   // No tests available for this platform
5390 }
5391 #endif
5392 
5393 bool os::start_debugging(char *buf, int buflen) {
5394   int len = (int)strlen(buf);
5395   char *p = &buf[len];
5396 
5397   jio_snprintf(p, buflen-len,
5398                "\n\n"
5399                "Do you want to debug the problem?\n\n"
5400                "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5401                "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5402                "Otherwise, press RETURN to abort...",
5403                os::current_process_id(), os::current_thread_id());
5404 
5405   bool yes = os::message_box("Unexpected Error", buf);
5406 
5407   if (yes) {
5408     // yes, user asked VM to launch debugger
5409     jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5410 
5411     os::fork_and_exec(buf);
5412     yes = false;
5413   }
5414   return yes;
5415 }