1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_solaris.h" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/filemap.hpp" 37 #include "mutex_solaris.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "prims/jniFastGetField.hpp" 41 #include "prims/jvm.h" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/extendedPC.hpp" 45 #include "runtime/globals.hpp" 46 #include "runtime/interfaceSupport.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/mutexLocker.hpp" 50 #include "runtime/objectMonitor.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/perfMemory.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/statSampler.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "runtime/thread.inline.hpp" 57 #include "runtime/threadCritical.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/attachListener.hpp" 60 #include "services/memTracker.hpp" 61 #include "services/runtimeService.hpp" 62 #include "utilities/decoder.hpp" 63 #include "utilities/defaultStream.hpp" 64 #include "utilities/events.hpp" 65 #include "utilities/growableArray.hpp" 66 #include "utilities/vmError.hpp" 67 68 // put OS-includes here 69 # include <dlfcn.h> 70 # include <errno.h> 71 # include <exception> 72 # include <link.h> 73 # include <poll.h> 74 # include <pthread.h> 75 # include <pwd.h> 76 # include <schedctl.h> 77 # include <setjmp.h> 78 # include <signal.h> 79 # include <stdio.h> 80 # include <alloca.h> 81 # include <sys/filio.h> 82 # include <sys/ipc.h> 83 # include <sys/lwp.h> 84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 85 # include <sys/mman.h> 86 # include <sys/processor.h> 87 # include <sys/procset.h> 88 # include <sys/pset.h> 89 # include <sys/resource.h> 90 # include <sys/shm.h> 91 # include <sys/socket.h> 92 # include <sys/stat.h> 93 # include <sys/systeminfo.h> 94 # include <sys/time.h> 95 # include <sys/times.h> 96 # include <sys/types.h> 97 # include <sys/wait.h> 98 # include <sys/utsname.h> 99 # include <thread.h> 100 # include <unistd.h> 101 # include <sys/priocntl.h> 102 # include <sys/rtpriocntl.h> 103 # include <sys/tspriocntl.h> 104 # include <sys/iapriocntl.h> 105 # include <sys/fxpriocntl.h> 106 # include <sys/loadavg.h> 107 # include <string.h> 108 # include <stdio.h> 109 110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 111 # include <sys/procfs.h> // see comment in <sys/procfs.h> 112 113 #define MAX_PATH (2 * K) 114 115 // for timer info max values which include all bits 116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 117 118 #ifdef _GNU_SOURCE 119 // See bug #6514594 120 extern "C" int madvise(caddr_t, size_t, int); 121 extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg, 122 int attr, int mask); 123 #endif //_GNU_SOURCE 124 125 /* 126 MPSS Changes Start. 127 The JVM binary needs to be built and run on pre-Solaris 9 128 systems, but the constants needed by MPSS are only in Solaris 9 129 header files. They are textually replicated here to allow 130 building on earlier systems. Once building on Solaris 8 is 131 no longer a requirement, these #defines can be replaced by ordinary 132 system .h inclusion. 133 134 In earlier versions of the JDK and Solaris, we used ISM for large pages. 135 But ISM requires shared memory to achieve this and thus has many caveats. 136 MPSS is a fully transparent and is a cleaner way to get large pages. 137 Although we still require keeping ISM for backward compatiblitiy as well as 138 giving the opportunity to use large pages on older systems it is 139 recommended that MPSS be used for Solaris 9 and above. 140 141 */ 142 143 #ifndef MC_HAT_ADVISE 144 145 struct memcntl_mha { 146 uint_t mha_cmd; /* command(s) */ 147 uint_t mha_flags; 148 size_t mha_pagesize; 149 }; 150 #define MC_HAT_ADVISE 7 /* advise hat map size */ 151 #define MHA_MAPSIZE_VA 0x1 /* set preferred page size */ 152 #define MAP_ALIGN 0x200 /* addr specifies alignment */ 153 154 #endif 155 // MPSS Changes End. 156 157 158 // Here are some liblgrp types from sys/lgrp_user.h to be able to 159 // compile on older systems without this header file. 160 161 #ifndef MADV_ACCESS_LWP 162 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 163 #endif 164 #ifndef MADV_ACCESS_MANY 165 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 166 #endif 167 168 #ifndef LGRP_RSRC_CPU 169 # define LGRP_RSRC_CPU 0 /* CPU resources */ 170 #endif 171 #ifndef LGRP_RSRC_MEM 172 # define LGRP_RSRC_MEM 1 /* memory resources */ 173 #endif 174 175 // Some more macros from sys/mman.h that are not present in Solaris 8. 176 177 #ifndef MAX_MEMINFO_CNT 178 /* 179 * info_req request type definitions for meminfo 180 * request types starting with MEMINFO_V are used for Virtual addresses 181 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical 182 * addresses 183 */ 184 # define MEMINFO_SHIFT 16 185 # define MEMINFO_MASK (0xFF << MEMINFO_SHIFT) 186 # define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */ 187 # define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */ 188 # define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */ 189 # define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */ 190 # define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */ 191 # define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */ 192 # define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */ 193 194 /* maximum number of addresses meminfo() can process at a time */ 195 # define MAX_MEMINFO_CNT 256 196 197 /* maximum number of request types */ 198 # define MAX_MEMINFO_REQ 31 199 #endif 200 201 // see thr_setprio(3T) for the basis of these numbers 202 #define MinimumPriority 0 203 #define NormalPriority 64 204 #define MaximumPriority 127 205 206 // Values for ThreadPriorityPolicy == 1 207 int prio_policy1[CriticalPriority+1] = { 208 -99999, 0, 16, 32, 48, 64, 209 80, 96, 112, 124, 127, 127 }; 210 211 // System parameters used internally 212 static clock_t clock_tics_per_sec = 100; 213 214 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 215 static bool enabled_extended_FILE_stdio = false; 216 217 // For diagnostics to print a message once. see run_periodic_checks 218 static bool check_addr0_done = false; 219 static sigset_t check_signal_done; 220 static bool check_signals = true; 221 222 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 223 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 224 225 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 226 227 228 // "default" initializers for missing libc APIs 229 extern "C" { 230 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 231 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 232 233 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 234 static int lwp_cond_destroy(cond_t *cv) { return 0; } 235 } 236 237 // "default" initializers for pthread-based synchronization 238 extern "C" { 239 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 240 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 241 } 242 243 // Thread Local Storage 244 // This is common to all Solaris platforms so it is defined here, 245 // in this common file. 246 // The declarations are in the os_cpu threadLS*.hpp files. 247 // 248 // Static member initialization for TLS 249 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 250 251 #ifndef PRODUCT 252 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 253 254 int ThreadLocalStorage::_tcacheHit = 0; 255 int ThreadLocalStorage::_tcacheMiss = 0; 256 257 void ThreadLocalStorage::print_statistics() { 258 int total = _tcacheMiss+_tcacheHit; 259 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 260 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 261 } 262 #undef _PCT 263 #endif // PRODUCT 264 265 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 266 int index) { 267 Thread *thread = get_thread_slow(); 268 if (thread != NULL) { 269 address sp = os::current_stack_pointer(); 270 guarantee(thread->_stack_base == NULL || 271 (sp <= thread->_stack_base && 272 sp >= thread->_stack_base - thread->_stack_size) || 273 is_error_reported(), 274 "sp must be inside of selected thread stack"); 275 276 thread->set_self_raw_id(raw_id); // mark for quick retrieval 277 _get_thread_cache[ index ] = thread; 278 } 279 return thread; 280 } 281 282 283 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 284 #define NO_CACHED_THREAD ((Thread*)all_zero) 285 286 void ThreadLocalStorage::pd_set_thread(Thread* thread) { 287 288 // Store the new value before updating the cache to prevent a race 289 // between get_thread_via_cache_slowly() and this store operation. 290 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 291 292 // Update thread cache with new thread if setting on thread create, 293 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 294 uintptr_t raw = pd_raw_thread_id(); 295 int ix = pd_cache_index(raw); 296 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 297 } 298 299 void ThreadLocalStorage::pd_init() { 300 for (int i = 0; i < _pd_cache_size; i++) { 301 _get_thread_cache[i] = NO_CACHED_THREAD; 302 } 303 } 304 305 // Invalidate all the caches (happens to be the same as pd_init). 306 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 307 308 #undef NO_CACHED_THREAD 309 310 // END Thread Local Storage 311 312 static inline size_t adjust_stack_size(address base, size_t size) { 313 if ((ssize_t)size < 0) { 314 // 4759953: Compensate for ridiculous stack size. 315 size = max_intx; 316 } 317 if (size > (size_t)base) { 318 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 319 size = (size_t)base; 320 } 321 return size; 322 } 323 324 static inline stack_t get_stack_info() { 325 stack_t st; 326 int retval = thr_stksegment(&st); 327 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 328 assert(retval == 0, "incorrect return value from thr_stksegment"); 329 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 330 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 331 return st; 332 } 333 334 address os::current_stack_base() { 335 int r = thr_main() ; 336 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 337 bool is_primordial_thread = r; 338 339 // Workaround 4352906, avoid calls to thr_stksegment by 340 // thr_main after the first one (it looks like we trash 341 // some data, causing the value for ss_sp to be incorrect). 342 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 343 stack_t st = get_stack_info(); 344 if (is_primordial_thread) { 345 // cache initial value of stack base 346 os::Solaris::_main_stack_base = (address)st.ss_sp; 347 } 348 return (address)st.ss_sp; 349 } else { 350 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 351 return os::Solaris::_main_stack_base; 352 } 353 } 354 355 size_t os::current_stack_size() { 356 size_t size; 357 358 int r = thr_main() ; 359 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 360 if(!r) { 361 size = get_stack_info().ss_size; 362 } else { 363 struct rlimit limits; 364 getrlimit(RLIMIT_STACK, &limits); 365 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 366 } 367 // base may not be page aligned 368 address base = current_stack_base(); 369 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 370 return (size_t)(base - bottom); 371 } 372 373 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 374 return localtime_r(clock, res); 375 } 376 377 // interruptible infrastructure 378 379 // setup_interruptible saves the thread state before going into an 380 // interruptible system call. 381 // The saved state is used to restore the thread to 382 // its former state whether or not an interrupt is received. 383 // Used by classloader os::read 384 // os::restartable_read calls skip this layer and stay in _thread_in_native 385 386 void os::Solaris::setup_interruptible(JavaThread* thread) { 387 388 JavaThreadState thread_state = thread->thread_state(); 389 390 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 391 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 392 OSThread* osthread = thread->osthread(); 393 osthread->set_saved_interrupt_thread_state(thread_state); 394 thread->frame_anchor()->make_walkable(thread); 395 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 396 } 397 398 // Version of setup_interruptible() for threads that are already in 399 // _thread_blocked. Used by os_sleep(). 400 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 401 thread->frame_anchor()->make_walkable(thread); 402 } 403 404 JavaThread* os::Solaris::setup_interruptible() { 405 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 406 setup_interruptible(thread); 407 return thread; 408 } 409 410 void os::Solaris::try_enable_extended_io() { 411 typedef int (*enable_extended_FILE_stdio_t)(int, int); 412 413 if (!UseExtendedFileIO) { 414 return; 415 } 416 417 enable_extended_FILE_stdio_t enabler = 418 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 419 "enable_extended_FILE_stdio"); 420 if (enabler) { 421 enabler(-1, -1); 422 } 423 } 424 425 426 #ifdef ASSERT 427 428 JavaThread* os::Solaris::setup_interruptible_native() { 429 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 430 JavaThreadState thread_state = thread->thread_state(); 431 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 432 return thread; 433 } 434 435 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 436 JavaThreadState thread_state = thread->thread_state(); 437 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 438 } 439 #endif 440 441 // cleanup_interruptible reverses the effects of setup_interruptible 442 // setup_interruptible_already_blocked() does not need any cleanup. 443 444 void os::Solaris::cleanup_interruptible(JavaThread* thread) { 445 OSThread* osthread = thread->osthread(); 446 447 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 448 } 449 450 // I/O interruption related counters called in _INTERRUPTIBLE 451 452 void os::Solaris::bump_interrupted_before_count() { 453 RuntimeService::record_interrupted_before_count(); 454 } 455 456 void os::Solaris::bump_interrupted_during_count() { 457 RuntimeService::record_interrupted_during_count(); 458 } 459 460 static int _processors_online = 0; 461 462 jint os::Solaris::_os_thread_limit = 0; 463 volatile jint os::Solaris::_os_thread_count = 0; 464 465 julong os::available_memory() { 466 return Solaris::available_memory(); 467 } 468 469 julong os::Solaris::available_memory() { 470 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 471 } 472 473 julong os::Solaris::_physical_memory = 0; 474 475 julong os::physical_memory() { 476 return Solaris::physical_memory(); 477 } 478 479 static hrtime_t first_hrtime = 0; 480 static const hrtime_t hrtime_hz = 1000*1000*1000; 481 const int LOCK_BUSY = 1; 482 const int LOCK_FREE = 0; 483 const int LOCK_INVALID = -1; 484 static volatile hrtime_t max_hrtime = 0; 485 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 486 487 488 void os::Solaris::initialize_system_info() { 489 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 490 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 491 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 492 } 493 494 int os::active_processor_count() { 495 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 496 pid_t pid = getpid(); 497 psetid_t pset = PS_NONE; 498 // Are we running in a processor set or is there any processor set around? 499 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 500 uint_t pset_cpus; 501 // Query the number of cpus available to us. 502 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 503 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 504 _processors_online = pset_cpus; 505 return pset_cpus; 506 } 507 } 508 // Otherwise return number of online cpus 509 return online_cpus; 510 } 511 512 static bool find_processors_in_pset(psetid_t pset, 513 processorid_t** id_array, 514 uint_t* id_length) { 515 bool result = false; 516 // Find the number of processors in the processor set. 517 if (pset_info(pset, NULL, id_length, NULL) == 0) { 518 // Make up an array to hold their ids. 519 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 520 // Fill in the array with their processor ids. 521 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 522 result = true; 523 } 524 } 525 return result; 526 } 527 528 // Callers of find_processors_online() must tolerate imprecise results -- 529 // the system configuration can change asynchronously because of DR 530 // or explicit psradm operations. 531 // 532 // We also need to take care that the loop (below) terminates as the 533 // number of processors online can change between the _SC_NPROCESSORS_ONLN 534 // request and the loop that builds the list of processor ids. Unfortunately 535 // there's no reliable way to determine the maximum valid processor id, 536 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 537 // man pages, which claim the processor id set is "sparse, but 538 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 539 // exit the loop. 540 // 541 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 542 // not available on S8.0. 543 544 static bool find_processors_online(processorid_t** id_array, 545 uint* id_length) { 546 const processorid_t MAX_PROCESSOR_ID = 100000 ; 547 // Find the number of processors online. 548 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 549 // Make up an array to hold their ids. 550 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 551 // Processors need not be numbered consecutively. 552 long found = 0; 553 processorid_t next = 0; 554 while (found < *id_length && next < MAX_PROCESSOR_ID) { 555 processor_info_t info; 556 if (processor_info(next, &info) == 0) { 557 // NB, PI_NOINTR processors are effectively online ... 558 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 559 (*id_array)[found] = next; 560 found += 1; 561 } 562 } 563 next += 1; 564 } 565 if (found < *id_length) { 566 // The loop above didn't identify the expected number of processors. 567 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 568 // and re-running the loop, above, but there's no guarantee of progress 569 // if the system configuration is in flux. Instead, we just return what 570 // we've got. Note that in the worst case find_processors_online() could 571 // return an empty set. (As a fall-back in the case of the empty set we 572 // could just return the ID of the current processor). 573 *id_length = found ; 574 } 575 576 return true; 577 } 578 579 static bool assign_distribution(processorid_t* id_array, 580 uint id_length, 581 uint* distribution, 582 uint distribution_length) { 583 // We assume we can assign processorid_t's to uint's. 584 assert(sizeof(processorid_t) == sizeof(uint), 585 "can't convert processorid_t to uint"); 586 // Quick check to see if we won't succeed. 587 if (id_length < distribution_length) { 588 return false; 589 } 590 // Assign processor ids to the distribution. 591 // Try to shuffle processors to distribute work across boards, 592 // assuming 4 processors per board. 593 const uint processors_per_board = ProcessDistributionStride; 594 // Find the maximum processor id. 595 processorid_t max_id = 0; 596 for (uint m = 0; m < id_length; m += 1) { 597 max_id = MAX2(max_id, id_array[m]); 598 } 599 // The next id, to limit loops. 600 const processorid_t limit_id = max_id + 1; 601 // Make up markers for available processors. 602 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 603 for (uint c = 0; c < limit_id; c += 1) { 604 available_id[c] = false; 605 } 606 for (uint a = 0; a < id_length; a += 1) { 607 available_id[id_array[a]] = true; 608 } 609 // Step by "boards", then by "slot", copying to "assigned". 610 // NEEDS_CLEANUP: The assignment of processors should be stateful, 611 // remembering which processors have been assigned by 612 // previous calls, etc., so as to distribute several 613 // independent calls of this method. What we'd like is 614 // It would be nice to have an API that let us ask 615 // how many processes are bound to a processor, 616 // but we don't have that, either. 617 // In the short term, "board" is static so that 618 // subsequent distributions don't all start at board 0. 619 static uint board = 0; 620 uint assigned = 0; 621 // Until we've found enough processors .... 622 while (assigned < distribution_length) { 623 // ... find the next available processor in the board. 624 for (uint slot = 0; slot < processors_per_board; slot += 1) { 625 uint try_id = board * processors_per_board + slot; 626 if ((try_id < limit_id) && (available_id[try_id] == true)) { 627 distribution[assigned] = try_id; 628 available_id[try_id] = false; 629 assigned += 1; 630 break; 631 } 632 } 633 board += 1; 634 if (board * processors_per_board + 0 >= limit_id) { 635 board = 0; 636 } 637 } 638 if (available_id != NULL) { 639 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal); 640 } 641 return true; 642 } 643 644 void os::set_native_thread_name(const char *name) { 645 // Not yet implemented. 646 return; 647 } 648 649 bool os::distribute_processes(uint length, uint* distribution) { 650 bool result = false; 651 // Find the processor id's of all the available CPUs. 652 processorid_t* id_array = NULL; 653 uint id_length = 0; 654 // There are some races between querying information and using it, 655 // since processor sets can change dynamically. 656 psetid_t pset = PS_NONE; 657 // Are we running in a processor set? 658 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 659 result = find_processors_in_pset(pset, &id_array, &id_length); 660 } else { 661 result = find_processors_online(&id_array, &id_length); 662 } 663 if (result == true) { 664 if (id_length >= length) { 665 result = assign_distribution(id_array, id_length, distribution, length); 666 } else { 667 result = false; 668 } 669 } 670 if (id_array != NULL) { 671 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal); 672 } 673 return result; 674 } 675 676 bool os::bind_to_processor(uint processor_id) { 677 // We assume that a processorid_t can be stored in a uint. 678 assert(sizeof(uint) == sizeof(processorid_t), 679 "can't convert uint to processorid_t"); 680 int bind_result = 681 processor_bind(P_LWPID, // bind LWP. 682 P_MYID, // bind current LWP. 683 (processorid_t) processor_id, // id. 684 NULL); // don't return old binding. 685 return (bind_result == 0); 686 } 687 688 bool os::getenv(const char* name, char* buffer, int len) { 689 char* val = ::getenv( name ); 690 if ( val == NULL 691 || strlen(val) + 1 > len ) { 692 if (len > 0) buffer[0] = 0; // return a null string 693 return false; 694 } 695 strcpy( buffer, val ); 696 return true; 697 } 698 699 700 // Return true if user is running as root. 701 702 bool os::have_special_privileges() { 703 static bool init = false; 704 static bool privileges = false; 705 if (!init) { 706 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 707 init = true; 708 } 709 return privileges; 710 } 711 712 713 void os::init_system_properties_values() { 714 char arch[12]; 715 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 716 717 // The next steps are taken in the product version: 718 // 719 // Obtain the JAVA_HOME value from the location of libjvm.so. 720 // This library should be located at: 721 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 722 // 723 // If "/jre/lib/" appears at the right place in the path, then we 724 // assume libjvm.so is installed in a JDK and we use this path. 725 // 726 // Otherwise exit with message: "Could not create the Java virtual machine." 727 // 728 // The following extra steps are taken in the debugging version: 729 // 730 // If "/jre/lib/" does NOT appear at the right place in the path 731 // instead of exit check for $JAVA_HOME environment variable. 732 // 733 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 734 // then we append a fake suffix "hotspot/libjvm.so" to this path so 735 // it looks like libjvm.so is installed there 736 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 737 // 738 // Otherwise exit. 739 // 740 // Important note: if the location of libjvm.so changes this 741 // code needs to be changed accordingly. 742 743 // The next few definitions allow the code to be verbatim: 744 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 745 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal) 746 #define getenv(n) ::getenv(n) 747 748 #define EXTENSIONS_DIR "/lib/ext" 749 #define ENDORSED_DIR "/lib/endorsed" 750 #define COMMON_DIR "/usr/jdk/packages" 751 752 { 753 /* sysclasspath, java_home, dll_dir */ 754 { 755 char *home_path; 756 char *dll_path; 757 char *pslash; 758 char buf[MAXPATHLEN]; 759 os::jvm_path(buf, sizeof(buf)); 760 761 // Found the full path to libjvm.so. 762 // Now cut the path to <java_home>/jre if we can. 763 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 764 pslash = strrchr(buf, '/'); 765 if (pslash != NULL) 766 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 767 dll_path = malloc(strlen(buf) + 1); 768 if (dll_path == NULL) 769 return; 770 strcpy(dll_path, buf); 771 Arguments::set_dll_dir(dll_path); 772 773 if (pslash != NULL) { 774 pslash = strrchr(buf, '/'); 775 if (pslash != NULL) { 776 *pslash = '\0'; /* get rid of /<arch> */ 777 pslash = strrchr(buf, '/'); 778 if (pslash != NULL) 779 *pslash = '\0'; /* get rid of /lib */ 780 } 781 } 782 783 home_path = malloc(strlen(buf) + 1); 784 if (home_path == NULL) 785 return; 786 strcpy(home_path, buf); 787 Arguments::set_java_home(home_path); 788 789 if (!set_boot_path('/', ':')) 790 return; 791 } 792 793 /* 794 * Where to look for native libraries 795 */ 796 { 797 // Use dlinfo() to determine the correct java.library.path. 798 // 799 // If we're launched by the Java launcher, and the user 800 // does not set java.library.path explicitly on the commandline, 801 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 802 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 803 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 804 // /usr/lib), which is exactly what we want. 805 // 806 // If the user does set java.library.path, it completely 807 // overwrites this setting, and always has. 808 // 809 // If we're not launched by the Java launcher, we may 810 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 811 // settings. Again, dlinfo does exactly what we want. 812 813 Dl_serinfo _info, *info = &_info; 814 Dl_serpath *path; 815 char* library_path; 816 char *common_path; 817 int i; 818 819 // determine search path count and required buffer size 820 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 821 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 822 } 823 824 // allocate new buffer and initialize 825 info = (Dl_serinfo*)malloc(_info.dls_size); 826 if (info == NULL) { 827 vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR, 828 "init_system_properties_values info"); 829 } 830 info->dls_size = _info.dls_size; 831 info->dls_cnt = _info.dls_cnt; 832 833 // obtain search path information 834 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 835 free(info); 836 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 837 } 838 839 path = &info->dls_serpath[0]; 840 841 // Note: Due to a legacy implementation, most of the library path 842 // is set in the launcher. This was to accomodate linking restrictions 843 // on legacy Solaris implementations (which are no longer supported). 844 // Eventually, all the library path setting will be done here. 845 // 846 // However, to prevent the proliferation of improperly built native 847 // libraries, the new path component /usr/jdk/packages is added here. 848 849 // Determine the actual CPU architecture. 850 char cpu_arch[12]; 851 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 852 #ifdef _LP64 853 // If we are a 64-bit vm, perform the following translations: 854 // sparc -> sparcv9 855 // i386 -> amd64 856 if (strcmp(cpu_arch, "sparc") == 0) 857 strcat(cpu_arch, "v9"); 858 else if (strcmp(cpu_arch, "i386") == 0) 859 strcpy(cpu_arch, "amd64"); 860 #endif 861 862 // Construct the invariant part of ld_library_path. Note that the 863 // space for the colon and the trailing null are provided by the 864 // nulls included by the sizeof operator. 865 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 866 common_path = malloc(bufsize); 867 if (common_path == NULL) { 868 free(info); 869 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 870 "init_system_properties_values common_path"); 871 } 872 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 873 874 // struct size is more than sufficient for the path components obtained 875 // through the dlinfo() call, so only add additional space for the path 876 // components explicitly added here. 877 bufsize = info->dls_size + strlen(common_path); 878 library_path = malloc(bufsize); 879 if (library_path == NULL) { 880 free(info); 881 free(common_path); 882 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 883 "init_system_properties_values library_path"); 884 } 885 library_path[0] = '\0'; 886 887 // Construct the desired Java library path from the linker's library 888 // search path. 889 // 890 // For compatibility, it is optimal that we insert the additional path 891 // components specific to the Java VM after those components specified 892 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 893 // infrastructure. 894 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 895 strcpy(library_path, common_path); 896 } else { 897 int inserted = 0; 898 for (i = 0; i < info->dls_cnt; i++, path++) { 899 uint_t flags = path->dls_flags & LA_SER_MASK; 900 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 901 strcat(library_path, common_path); 902 strcat(library_path, os::path_separator()); 903 inserted = 1; 904 } 905 strcat(library_path, path->dls_name); 906 strcat(library_path, os::path_separator()); 907 } 908 // eliminate trailing path separator 909 library_path[strlen(library_path)-1] = '\0'; 910 } 911 912 // happens before argument parsing - can't use a trace flag 913 // tty->print_raw("init_system_properties_values: native lib path: "); 914 // tty->print_raw_cr(library_path); 915 916 // callee copies into its own buffer 917 Arguments::set_library_path(library_path); 918 919 free(common_path); 920 free(library_path); 921 free(info); 922 } 923 924 /* 925 * Extensions directories. 926 * 927 * Note that the space for the colon and the trailing null are provided 928 * by the nulls included by the sizeof operator (so actually one byte more 929 * than necessary is allocated). 930 */ 931 { 932 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 933 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 934 sizeof(EXTENSIONS_DIR)); 935 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 936 Arguments::get_java_home()); 937 Arguments::set_ext_dirs(buf); 938 } 939 940 /* Endorsed standards default directory. */ 941 { 942 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 943 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 944 Arguments::set_endorsed_dirs(buf); 945 } 946 } 947 948 #undef malloc 949 #undef free 950 #undef getenv 951 #undef EXTENSIONS_DIR 952 #undef ENDORSED_DIR 953 #undef COMMON_DIR 954 955 } 956 957 void os::breakpoint() { 958 BREAKPOINT; 959 } 960 961 bool os::obsolete_option(const JavaVMOption *option) 962 { 963 if (!strncmp(option->optionString, "-Xt", 3)) { 964 return true; 965 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 966 return true; 967 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 968 return true; 969 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 970 return true; 971 } 972 return false; 973 } 974 975 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 976 address stackStart = (address)thread->stack_base(); 977 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 978 if (sp < stackStart && sp >= stackEnd ) return true; 979 return false; 980 } 981 982 extern "C" void breakpoint() { 983 // use debugger to set breakpoint here 984 } 985 986 static thread_t main_thread; 987 988 // Thread start routine for all new Java threads 989 extern "C" void* java_start(void* thread_addr) { 990 // Try to randomize the cache line index of hot stack frames. 991 // This helps when threads of the same stack traces evict each other's 992 // cache lines. The threads can be either from the same JVM instance, or 993 // from different JVM instances. The benefit is especially true for 994 // processors with hyperthreading technology. 995 static int counter = 0; 996 int pid = os::current_process_id(); 997 alloca(((pid ^ counter++) & 7) * 128); 998 999 int prio; 1000 Thread* thread = (Thread*)thread_addr; 1001 OSThread* osthr = thread->osthread(); 1002 1003 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 1004 thread->_schedctl = (void *) schedctl_init () ; 1005 1006 if (UseNUMA) { 1007 int lgrp_id = os::numa_get_group_id(); 1008 if (lgrp_id != -1) { 1009 thread->set_lgrp_id(lgrp_id); 1010 } 1011 } 1012 1013 // If the creator called set priority before we started, 1014 // we need to call set_native_priority now that we have an lwp. 1015 // We used to get the priority from thr_getprio (we called 1016 // thr_setprio way back in create_thread) and pass it to 1017 // set_native_priority, but Solaris scales the priority 1018 // in java_to_os_priority, so when we read it back here, 1019 // we pass trash to set_native_priority instead of what's 1020 // in java_to_os_priority. So we save the native priority 1021 // in the osThread and recall it here. 1022 1023 if ( osthr->thread_id() != -1 ) { 1024 if ( UseThreadPriorities ) { 1025 int prio = osthr->native_priority(); 1026 if (ThreadPriorityVerbose) { 1027 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 1028 INTPTR_FORMAT ", setting priority: %d\n", 1029 osthr->thread_id(), osthr->lwp_id(), prio); 1030 } 1031 os::set_native_priority(thread, prio); 1032 } 1033 } else if (ThreadPriorityVerbose) { 1034 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 1035 } 1036 1037 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 1038 1039 // initialize signal mask for this thread 1040 os::Solaris::hotspot_sigmask(thread); 1041 1042 thread->run(); 1043 1044 // One less thread is executing 1045 // When the VMThread gets here, the main thread may have already exited 1046 // which frees the CodeHeap containing the Atomic::dec code 1047 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 1048 Atomic::dec(&os::Solaris::_os_thread_count); 1049 } 1050 1051 if (UseDetachedThreads) { 1052 thr_exit(NULL); 1053 ShouldNotReachHere(); 1054 } 1055 return NULL; 1056 } 1057 1058 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 1059 // Allocate the OSThread object 1060 OSThread* osthread = new OSThread(NULL, NULL); 1061 if (osthread == NULL) return NULL; 1062 1063 // Store info on the Solaris thread into the OSThread 1064 osthread->set_thread_id(thread_id); 1065 osthread->set_lwp_id(_lwp_self()); 1066 thread->_schedctl = (void *) schedctl_init () ; 1067 1068 if (UseNUMA) { 1069 int lgrp_id = os::numa_get_group_id(); 1070 if (lgrp_id != -1) { 1071 thread->set_lgrp_id(lgrp_id); 1072 } 1073 } 1074 1075 if ( ThreadPriorityVerbose ) { 1076 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 1077 osthread->thread_id(), osthread->lwp_id() ); 1078 } 1079 1080 // Initial thread state is INITIALIZED, not SUSPENDED 1081 osthread->set_state(INITIALIZED); 1082 1083 return osthread; 1084 } 1085 1086 void os::Solaris::hotspot_sigmask(Thread* thread) { 1087 1088 //Save caller's signal mask 1089 sigset_t sigmask; 1090 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 1091 OSThread *osthread = thread->osthread(); 1092 osthread->set_caller_sigmask(sigmask); 1093 1094 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 1095 if (!ReduceSignalUsage) { 1096 if (thread->is_VM_thread()) { 1097 // Only the VM thread handles BREAK_SIGNAL ... 1098 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 1099 } else { 1100 // ... all other threads block BREAK_SIGNAL 1101 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 1102 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 1103 } 1104 } 1105 } 1106 1107 bool os::create_attached_thread(JavaThread* thread) { 1108 #ifdef ASSERT 1109 thread->verify_not_published(); 1110 #endif 1111 OSThread* osthread = create_os_thread(thread, thr_self()); 1112 if (osthread == NULL) { 1113 return false; 1114 } 1115 1116 // Initial thread state is RUNNABLE 1117 osthread->set_state(RUNNABLE); 1118 thread->set_osthread(osthread); 1119 1120 // initialize signal mask for this thread 1121 // and save the caller's signal mask 1122 os::Solaris::hotspot_sigmask(thread); 1123 1124 return true; 1125 } 1126 1127 bool os::create_main_thread(JavaThread* thread) { 1128 #ifdef ASSERT 1129 thread->verify_not_published(); 1130 #endif 1131 if (_starting_thread == NULL) { 1132 _starting_thread = create_os_thread(thread, main_thread); 1133 if (_starting_thread == NULL) { 1134 return false; 1135 } 1136 } 1137 1138 // The primodial thread is runnable from the start 1139 _starting_thread->set_state(RUNNABLE); 1140 1141 thread->set_osthread(_starting_thread); 1142 1143 // initialize signal mask for this thread 1144 // and save the caller's signal mask 1145 os::Solaris::hotspot_sigmask(thread); 1146 1147 return true; 1148 } 1149 1150 // _T2_libthread is true if we believe we are running with the newer 1151 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1152 bool os::Solaris::_T2_libthread = false; 1153 1154 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1155 // Allocate the OSThread object 1156 OSThread* osthread = new OSThread(NULL, NULL); 1157 if (osthread == NULL) { 1158 return false; 1159 } 1160 1161 if ( ThreadPriorityVerbose ) { 1162 char *thrtyp; 1163 switch ( thr_type ) { 1164 case vm_thread: 1165 thrtyp = (char *)"vm"; 1166 break; 1167 case cgc_thread: 1168 thrtyp = (char *)"cgc"; 1169 break; 1170 case pgc_thread: 1171 thrtyp = (char *)"pgc"; 1172 break; 1173 case java_thread: 1174 thrtyp = (char *)"java"; 1175 break; 1176 case compiler_thread: 1177 thrtyp = (char *)"compiler"; 1178 break; 1179 case watcher_thread: 1180 thrtyp = (char *)"watcher"; 1181 break; 1182 default: 1183 thrtyp = (char *)"unknown"; 1184 break; 1185 } 1186 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1187 } 1188 1189 // Calculate stack size if it's not specified by caller. 1190 if (stack_size == 0) { 1191 // The default stack size 1M (2M for LP64). 1192 stack_size = (BytesPerWord >> 2) * K * K; 1193 1194 switch (thr_type) { 1195 case os::java_thread: 1196 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1197 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1198 break; 1199 case os::compiler_thread: 1200 if (CompilerThreadStackSize > 0) { 1201 stack_size = (size_t)(CompilerThreadStackSize * K); 1202 break; 1203 } // else fall through: 1204 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1205 case os::vm_thread: 1206 case os::pgc_thread: 1207 case os::cgc_thread: 1208 case os::watcher_thread: 1209 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1210 break; 1211 } 1212 } 1213 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1214 1215 // Initial state is ALLOCATED but not INITIALIZED 1216 osthread->set_state(ALLOCATED); 1217 1218 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1219 // We got lots of threads. Check if we still have some address space left. 1220 // Need to be at least 5Mb of unreserved address space. We do check by 1221 // trying to reserve some. 1222 const size_t VirtualMemoryBangSize = 20*K*K; 1223 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1224 if (mem == NULL) { 1225 delete osthread; 1226 return false; 1227 } else { 1228 // Release the memory again 1229 os::release_memory(mem, VirtualMemoryBangSize); 1230 } 1231 } 1232 1233 // Setup osthread because the child thread may need it. 1234 thread->set_osthread(osthread); 1235 1236 // Create the Solaris thread 1237 // explicit THR_BOUND for T2_libthread case in case 1238 // that assumption is not accurate, but our alternate signal stack 1239 // handling is based on it which must have bound threads 1240 thread_t tid = 0; 1241 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1242 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1243 (thr_type == vm_thread) || 1244 (thr_type == cgc_thread) || 1245 (thr_type == pgc_thread) || 1246 (thr_type == compiler_thread && BackgroundCompilation)) ? 1247 THR_BOUND : 0); 1248 int status; 1249 1250 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1251 // 1252 // On multiprocessors systems, libthread sometimes under-provisions our 1253 // process with LWPs. On a 30-way systems, for instance, we could have 1254 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1255 // to our process. This can result in under utilization of PEs. 1256 // I suspect the problem is related to libthread's LWP 1257 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1258 // upcall policy. 1259 // 1260 // The following code is palliative -- it attempts to ensure that our 1261 // process has sufficient LWPs to take advantage of multiple PEs. 1262 // Proper long-term cures include using user-level threads bound to LWPs 1263 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1264 // slight timing window with respect to sampling _os_thread_count, but 1265 // the race is benign. Also, we should periodically recompute 1266 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1267 // the number of PEs in our partition. You might be tempted to use 1268 // THR_NEW_LWP here, but I'd recommend against it as that could 1269 // result in undesirable growth of the libthread's LWP pool. 1270 // The fix below isn't sufficient; for instance, it doesn't take into count 1271 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1272 // 1273 // Some pathologies this scheme doesn't handle: 1274 // * Threads can block, releasing the LWPs. The LWPs can age out. 1275 // When a large number of threads become ready again there aren't 1276 // enough LWPs available to service them. This can occur when the 1277 // number of ready threads oscillates. 1278 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1279 // 1280 // Finally, we should call thr_setconcurrency() periodically to refresh 1281 // the LWP pool and thwart the LWP age-out mechanism. 1282 // The "+3" term provides a little slop -- we want to slightly overprovision. 1283 1284 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1285 if (!(flags & THR_BOUND)) { 1286 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1287 } 1288 } 1289 // Although this doesn't hurt, we should warn of undefined behavior 1290 // when using unbound T1 threads with schedctl(). This should never 1291 // happen, as the compiler and VM threads are always created bound 1292 DEBUG_ONLY( 1293 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1294 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1295 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1296 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1297 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1298 } 1299 ); 1300 1301 1302 // Mark that we don't have an lwp or thread id yet. 1303 // In case we attempt to set the priority before the thread starts. 1304 osthread->set_lwp_id(-1); 1305 osthread->set_thread_id(-1); 1306 1307 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1308 if (status != 0) { 1309 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1310 perror("os::create_thread"); 1311 } 1312 thread->set_osthread(NULL); 1313 // Need to clean up stuff we've allocated so far 1314 delete osthread; 1315 return false; 1316 } 1317 1318 Atomic::inc(&os::Solaris::_os_thread_count); 1319 1320 // Store info on the Solaris thread into the OSThread 1321 osthread->set_thread_id(tid); 1322 1323 // Remember that we created this thread so we can set priority on it 1324 osthread->set_vm_created(); 1325 1326 // Set the default thread priority. If using bound threads, setting 1327 // lwp priority will be delayed until thread start. 1328 set_native_priority(thread, 1329 DefaultThreadPriority == -1 ? 1330 java_to_os_priority[NormPriority] : 1331 DefaultThreadPriority); 1332 1333 // Initial thread state is INITIALIZED, not SUSPENDED 1334 osthread->set_state(INITIALIZED); 1335 1336 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1337 return true; 1338 } 1339 1340 /* defined for >= Solaris 10. This allows builds on earlier versions 1341 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1342 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1343 * and -XX:+UseAltSigs does nothing since these should have no conflict 1344 */ 1345 #if !defined(SIGJVM1) 1346 #define SIGJVM1 39 1347 #define SIGJVM2 40 1348 #endif 1349 1350 debug_only(static bool signal_sets_initialized = false); 1351 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1352 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1353 int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1354 1355 bool os::Solaris::is_sig_ignored(int sig) { 1356 struct sigaction oact; 1357 sigaction(sig, (struct sigaction*)NULL, &oact); 1358 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1359 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1360 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1361 return true; 1362 else 1363 return false; 1364 } 1365 1366 // Note: SIGRTMIN is a macro that calls sysconf() so it will 1367 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1368 static bool isJVM1available() { 1369 return SIGJVM1 < SIGRTMIN; 1370 } 1371 1372 void os::Solaris::signal_sets_init() { 1373 // Should also have an assertion stating we are still single-threaded. 1374 assert(!signal_sets_initialized, "Already initialized"); 1375 // Fill in signals that are necessarily unblocked for all threads in 1376 // the VM. Currently, we unblock the following signals: 1377 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1378 // by -Xrs (=ReduceSignalUsage)); 1379 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1380 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1381 // the dispositions or masks wrt these signals. 1382 // Programs embedding the VM that want to use the above signals for their 1383 // own purposes must, at this time, use the "-Xrs" option to prevent 1384 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1385 // (See bug 4345157, and other related bugs). 1386 // In reality, though, unblocking these signals is really a nop, since 1387 // these signals are not blocked by default. 1388 sigemptyset(&unblocked_sigs); 1389 sigemptyset(&allowdebug_blocked_sigs); 1390 sigaddset(&unblocked_sigs, SIGILL); 1391 sigaddset(&unblocked_sigs, SIGSEGV); 1392 sigaddset(&unblocked_sigs, SIGBUS); 1393 sigaddset(&unblocked_sigs, SIGFPE); 1394 1395 if (isJVM1available) { 1396 os::Solaris::set_SIGinterrupt(SIGJVM1); 1397 os::Solaris::set_SIGasync(SIGJVM2); 1398 } else if (UseAltSigs) { 1399 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1400 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1401 } else { 1402 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1403 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1404 } 1405 1406 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1407 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1408 1409 if (!ReduceSignalUsage) { 1410 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1411 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1412 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1413 } 1414 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1415 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1416 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1417 } 1418 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1419 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1420 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1421 } 1422 } 1423 // Fill in signals that are blocked by all but the VM thread. 1424 sigemptyset(&vm_sigs); 1425 if (!ReduceSignalUsage) 1426 sigaddset(&vm_sigs, BREAK_SIGNAL); 1427 debug_only(signal_sets_initialized = true); 1428 1429 // For diagnostics only used in run_periodic_checks 1430 sigemptyset(&check_signal_done); 1431 } 1432 1433 // These are signals that are unblocked while a thread is running Java. 1434 // (For some reason, they get blocked by default.) 1435 sigset_t* os::Solaris::unblocked_signals() { 1436 assert(signal_sets_initialized, "Not initialized"); 1437 return &unblocked_sigs; 1438 } 1439 1440 // These are the signals that are blocked while a (non-VM) thread is 1441 // running Java. Only the VM thread handles these signals. 1442 sigset_t* os::Solaris::vm_signals() { 1443 assert(signal_sets_initialized, "Not initialized"); 1444 return &vm_sigs; 1445 } 1446 1447 // These are signals that are blocked during cond_wait to allow debugger in 1448 sigset_t* os::Solaris::allowdebug_blocked_signals() { 1449 assert(signal_sets_initialized, "Not initialized"); 1450 return &allowdebug_blocked_sigs; 1451 } 1452 1453 1454 void _handle_uncaught_cxx_exception() { 1455 VMError err("An uncaught C++ exception"); 1456 err.report_and_die(); 1457 } 1458 1459 1460 // First crack at OS-specific initialization, from inside the new thread. 1461 void os::initialize_thread(Thread* thr) { 1462 int r = thr_main() ; 1463 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1464 if (r) { 1465 JavaThread* jt = (JavaThread *)thr; 1466 assert(jt != NULL,"Sanity check"); 1467 size_t stack_size; 1468 address base = jt->stack_base(); 1469 if (Arguments::created_by_java_launcher()) { 1470 // Use 2MB to allow for Solaris 7 64 bit mode. 1471 stack_size = JavaThread::stack_size_at_create() == 0 1472 ? 2048*K : JavaThread::stack_size_at_create(); 1473 1474 // There are rare cases when we may have already used more than 1475 // the basic stack size allotment before this method is invoked. 1476 // Attempt to allow for a normally sized java_stack. 1477 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1478 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1479 } else { 1480 // 6269555: If we were not created by a Java launcher, i.e. if we are 1481 // running embedded in a native application, treat the primordial thread 1482 // as much like a native attached thread as possible. This means using 1483 // the current stack size from thr_stksegment(), unless it is too large 1484 // to reliably setup guard pages. A reasonable max size is 8MB. 1485 size_t current_size = current_stack_size(); 1486 // This should never happen, but just in case.... 1487 if (current_size == 0) current_size = 2 * K * K; 1488 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1489 } 1490 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1491 stack_size = (size_t)(base - bottom); 1492 1493 assert(stack_size > 0, "Stack size calculation problem"); 1494 1495 if (stack_size > jt->stack_size()) { 1496 NOT_PRODUCT( 1497 struct rlimit limits; 1498 getrlimit(RLIMIT_STACK, &limits); 1499 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1500 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1501 ) 1502 tty->print_cr( 1503 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1504 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1505 "See limit(1) to increase the stack size limit.", 1506 stack_size / K, jt->stack_size() / K); 1507 vm_exit(1); 1508 } 1509 assert(jt->stack_size() >= stack_size, 1510 "Attempt to map more stack than was allocated"); 1511 jt->set_stack_size(stack_size); 1512 } 1513 1514 // 5/22/01: Right now alternate signal stacks do not handle 1515 // throwing stack overflow exceptions, see bug 4463178 1516 // Until a fix is found for this, T2 will NOT imply alternate signal 1517 // stacks. 1518 // If using T2 libthread threads, install an alternate signal stack. 1519 // Because alternate stacks associate with LWPs on Solaris, 1520 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1521 // we prefer to explicitly stack bang. 1522 // If not using T2 libthread, but using UseBoundThreads any threads 1523 // (primordial thread, jni_attachCurrentThread) we do not create, 1524 // probably are not bound, therefore they can not have an alternate 1525 // signal stack. Since our stack banging code is generated and 1526 // is shared across threads, all threads must be bound to allow 1527 // using alternate signal stacks. The alternative is to interpose 1528 // on _lwp_create to associate an alt sig stack with each LWP, 1529 // and this could be a problem when the JVM is embedded. 1530 // We would prefer to use alternate signal stacks with T2 1531 // Since there is currently no accurate way to detect T2 1532 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1533 // on installing alternate signal stacks 1534 1535 1536 // 05/09/03: removed alternate signal stack support for Solaris 1537 // The alternate signal stack mechanism is no longer needed to 1538 // handle stack overflow. This is now handled by allocating 1539 // guard pages (red zone) and stackbanging. 1540 // Initially the alternate signal stack mechanism was removed because 1541 // it did not work with T1 llibthread. Alternate 1542 // signal stacks MUST have all threads bound to lwps. Applications 1543 // can create their own threads and attach them without their being 1544 // bound under T1. This is frequently the case for the primordial thread. 1545 // If we were ever to reenable this mechanism we would need to 1546 // use the dynamic check for T2 libthread. 1547 1548 os::Solaris::init_thread_fpu_state(); 1549 std::set_terminate(_handle_uncaught_cxx_exception); 1550 } 1551 1552 1553 1554 // Free Solaris resources related to the OSThread 1555 void os::free_thread(OSThread* osthread) { 1556 assert(osthread != NULL, "os::free_thread but osthread not set"); 1557 1558 1559 // We are told to free resources of the argument thread, 1560 // but we can only really operate on the current thread. 1561 // The main thread must take the VMThread down synchronously 1562 // before the main thread exits and frees up CodeHeap 1563 guarantee((Thread::current()->osthread() == osthread 1564 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1565 if (Thread::current()->osthread() == osthread) { 1566 // Restore caller's signal mask 1567 sigset_t sigmask = osthread->caller_sigmask(); 1568 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1569 } 1570 delete osthread; 1571 } 1572 1573 void os::pd_start_thread(Thread* thread) { 1574 int status = thr_continue(thread->osthread()->thread_id()); 1575 assert_status(status == 0, status, "thr_continue failed"); 1576 } 1577 1578 1579 intx os::current_thread_id() { 1580 return (intx)thr_self(); 1581 } 1582 1583 static pid_t _initial_pid = 0; 1584 1585 int os::current_process_id() { 1586 return (int)(_initial_pid ? _initial_pid : getpid()); 1587 } 1588 1589 int os::allocate_thread_local_storage() { 1590 // %%% in Win32 this allocates a memory segment pointed to by a 1591 // register. Dan Stein can implement a similar feature in 1592 // Solaris. Alternatively, the VM can do the same thing 1593 // explicitly: malloc some storage and keep the pointer in a 1594 // register (which is part of the thread's context) (or keep it 1595 // in TLS). 1596 // %%% In current versions of Solaris, thr_self and TSD can 1597 // be accessed via short sequences of displaced indirections. 1598 // The value of thr_self is available as %g7(36). 1599 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1600 // assuming that the current thread already has a value bound to k. 1601 // It may be worth experimenting with such access patterns, 1602 // and later having the parameters formally exported from a Solaris 1603 // interface. I think, however, that it will be faster to 1604 // maintain the invariant that %g2 always contains the 1605 // JavaThread in Java code, and have stubs simply 1606 // treat %g2 as a caller-save register, preserving it in a %lN. 1607 thread_key_t tk; 1608 if (thr_keycreate( &tk, NULL ) ) 1609 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed " 1610 "(%s)", strerror(errno))); 1611 return int(tk); 1612 } 1613 1614 void os::free_thread_local_storage(int index) { 1615 // %%% don't think we need anything here 1616 // if ( pthread_key_delete((pthread_key_t) tk) ) 1617 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1618 } 1619 1620 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1621 // small number - point is NO swap space available 1622 void os::thread_local_storage_at_put(int index, void* value) { 1623 // %%% this is used only in threadLocalStorage.cpp 1624 if (thr_setspecific((thread_key_t)index, value)) { 1625 if (errno == ENOMEM) { 1626 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR, 1627 "thr_setspecific: out of swap space"); 1628 } else { 1629 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed " 1630 "(%s)", strerror(errno))); 1631 } 1632 } else { 1633 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1634 } 1635 } 1636 1637 // This function could be called before TLS is initialized, for example, when 1638 // VM receives an async signal or when VM causes a fatal error during 1639 // initialization. Return NULL if thr_getspecific() fails. 1640 void* os::thread_local_storage_at(int index) { 1641 // %%% this is used only in threadLocalStorage.cpp 1642 void* r = NULL; 1643 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1644 } 1645 1646 1647 // gethrtime can move backwards if read from one cpu and then a different cpu 1648 // getTimeNanos is guaranteed to not move backward on Solaris 1649 // local spinloop created as faster for a CAS on an int than 1650 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1651 // supported on sparc v8 or pre supports_cx8 intel boxes. 1652 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1653 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1654 inline hrtime_t oldgetTimeNanos() { 1655 int gotlock = LOCK_INVALID; 1656 hrtime_t newtime = gethrtime(); 1657 1658 for (;;) { 1659 // grab lock for max_hrtime 1660 int curlock = max_hrtime_lock; 1661 if (curlock & LOCK_BUSY) continue; 1662 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1663 if (newtime > max_hrtime) { 1664 max_hrtime = newtime; 1665 } else { 1666 newtime = max_hrtime; 1667 } 1668 // release lock 1669 max_hrtime_lock = LOCK_FREE; 1670 return newtime; 1671 } 1672 } 1673 // gethrtime can move backwards if read from one cpu and then a different cpu 1674 // getTimeNanos is guaranteed to not move backward on Solaris 1675 inline hrtime_t getTimeNanos() { 1676 if (VM_Version::supports_cx8()) { 1677 const hrtime_t now = gethrtime(); 1678 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. 1679 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); 1680 if (now <= prev) return prev; // same or retrograde time; 1681 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1682 assert(obsv >= prev, "invariant"); // Monotonicity 1683 // If the CAS succeeded then we're done and return "now". 1684 // If the CAS failed and the observed value "obs" is >= now then 1685 // we should return "obs". If the CAS failed and now > obs > prv then 1686 // some other thread raced this thread and installed a new value, in which case 1687 // we could either (a) retry the entire operation, (b) retry trying to install now 1688 // or (c) just return obs. We use (c). No loop is required although in some cases 1689 // we might discard a higher "now" value in deference to a slightly lower but freshly 1690 // installed obs value. That's entirely benign -- it admits no new orderings compared 1691 // to (a) or (b) -- and greatly reduces coherence traffic. 1692 // We might also condition (c) on the magnitude of the delta between obs and now. 1693 // Avoiding excessive CAS operations to hot RW locations is critical. 1694 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate 1695 return (prev == obsv) ? now : obsv ; 1696 } else { 1697 return oldgetTimeNanos(); 1698 } 1699 } 1700 1701 // Time since start-up in seconds to a fine granularity. 1702 // Used by VMSelfDestructTimer and the MemProfiler. 1703 double os::elapsedTime() { 1704 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1705 } 1706 1707 jlong os::elapsed_counter() { 1708 return (jlong)(getTimeNanos() - first_hrtime); 1709 } 1710 1711 jlong os::elapsed_frequency() { 1712 return hrtime_hz; 1713 } 1714 1715 // Return the real, user, and system times in seconds from an 1716 // arbitrary fixed point in the past. 1717 bool os::getTimesSecs(double* process_real_time, 1718 double* process_user_time, 1719 double* process_system_time) { 1720 struct tms ticks; 1721 clock_t real_ticks = times(&ticks); 1722 1723 if (real_ticks == (clock_t) (-1)) { 1724 return false; 1725 } else { 1726 double ticks_per_second = (double) clock_tics_per_sec; 1727 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1728 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1729 // For consistency return the real time from getTimeNanos() 1730 // converted to seconds. 1731 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1732 1733 return true; 1734 } 1735 } 1736 1737 bool os::supports_vtime() { return true; } 1738 1739 bool os::enable_vtime() { 1740 int fd = ::open("/proc/self/ctl", O_WRONLY); 1741 if (fd == -1) 1742 return false; 1743 1744 long cmd[] = { PCSET, PR_MSACCT }; 1745 int res = ::write(fd, cmd, sizeof(long) * 2); 1746 ::close(fd); 1747 if (res != sizeof(long) * 2) 1748 return false; 1749 1750 return true; 1751 } 1752 1753 bool os::vtime_enabled() { 1754 int fd = ::open("/proc/self/status", O_RDONLY); 1755 if (fd == -1) 1756 return false; 1757 1758 pstatus_t status; 1759 int res = os::read(fd, (void*) &status, sizeof(pstatus_t)); 1760 ::close(fd); 1761 if (res != sizeof(pstatus_t)) 1762 return false; 1763 1764 return status.pr_flags & PR_MSACCT; 1765 } 1766 1767 double os::elapsedVTime() { 1768 return (double)gethrvtime() / (double)hrtime_hz; 1769 } 1770 1771 // Used internally for comparisons only 1772 // getTimeMillis guaranteed to not move backwards on Solaris 1773 jlong getTimeMillis() { 1774 jlong nanotime = getTimeNanos(); 1775 return (jlong)(nanotime / NANOSECS_PER_MILLISEC); 1776 } 1777 1778 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1779 jlong os::javaTimeMillis() { 1780 timeval t; 1781 if (gettimeofday( &t, NULL) == -1) 1782 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno))); 1783 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1784 } 1785 1786 jlong os::javaTimeNanos() { 1787 return (jlong)getTimeNanos(); 1788 } 1789 1790 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1791 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1792 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1793 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1794 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1795 } 1796 1797 char * os::local_time_string(char *buf, size_t buflen) { 1798 struct tm t; 1799 time_t long_time; 1800 time(&long_time); 1801 localtime_r(&long_time, &t); 1802 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1803 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1804 t.tm_hour, t.tm_min, t.tm_sec); 1805 return buf; 1806 } 1807 1808 // Note: os::shutdown() might be called very early during initialization, or 1809 // called from signal handler. Before adding something to os::shutdown(), make 1810 // sure it is async-safe and can handle partially initialized VM. 1811 void os::shutdown() { 1812 1813 // allow PerfMemory to attempt cleanup of any persistent resources 1814 perfMemory_exit(); 1815 1816 // needs to remove object in file system 1817 AttachListener::abort(); 1818 1819 // flush buffered output, finish log files 1820 ostream_abort(); 1821 1822 // Check for abort hook 1823 abort_hook_t abort_hook = Arguments::abort_hook(); 1824 if (abort_hook != NULL) { 1825 abort_hook(); 1826 } 1827 } 1828 1829 // Note: os::abort() might be called very early during initialization, or 1830 // called from signal handler. Before adding something to os::abort(), make 1831 // sure it is async-safe and can handle partially initialized VM. 1832 void os::abort(bool dump_core) { 1833 os::shutdown(); 1834 if (dump_core) { 1835 #ifndef PRODUCT 1836 fdStream out(defaultStream::output_fd()); 1837 out.print_raw("Current thread is "); 1838 char buf[16]; 1839 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1840 out.print_raw_cr(buf); 1841 out.print_raw_cr("Dumping core ..."); 1842 #endif 1843 ::abort(); // dump core (for debugging) 1844 } 1845 1846 ::exit(1); 1847 } 1848 1849 // Die immediately, no exit hook, no abort hook, no cleanup. 1850 void os::die() { 1851 ::abort(); // dump core (for debugging) 1852 } 1853 1854 // unused 1855 void os::set_error_file(const char *logfile) {} 1856 1857 // DLL functions 1858 1859 const char* os::dll_file_extension() { return ".so"; } 1860 1861 // This must be hard coded because it's the system's temporary 1862 // directory not the java application's temp directory, ala java.io.tmpdir. 1863 const char* os::get_temp_directory() { return "/tmp"; } 1864 1865 static bool file_exists(const char* filename) { 1866 struct stat statbuf; 1867 if (filename == NULL || strlen(filename) == 0) { 1868 return false; 1869 } 1870 return os::stat(filename, &statbuf) == 0; 1871 } 1872 1873 bool os::dll_build_name(char* buffer, size_t buflen, 1874 const char* pname, const char* fname) { 1875 bool retval = false; 1876 const size_t pnamelen = pname ? strlen(pname) : 0; 1877 1878 // Return error on buffer overflow. 1879 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1880 return retval; 1881 } 1882 1883 if (pnamelen == 0) { 1884 snprintf(buffer, buflen, "lib%s.so", fname); 1885 retval = true; 1886 } else if (strchr(pname, *os::path_separator()) != NULL) { 1887 int n; 1888 char** pelements = split_path(pname, &n); 1889 if (pelements == NULL) { 1890 return false; 1891 } 1892 for (int i = 0 ; i < n ; i++) { 1893 // really shouldn't be NULL but what the heck, check can't hurt 1894 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1895 continue; // skip the empty path values 1896 } 1897 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1898 if (file_exists(buffer)) { 1899 retval = true; 1900 break; 1901 } 1902 } 1903 // release the storage 1904 for (int i = 0 ; i < n ; i++) { 1905 if (pelements[i] != NULL) { 1906 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1907 } 1908 } 1909 if (pelements != NULL) { 1910 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1911 } 1912 } else { 1913 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1914 retval = true; 1915 } 1916 return retval; 1917 } 1918 1919 // check if addr is inside libjvm.so 1920 bool os::address_is_in_vm(address addr) { 1921 static address libjvm_base_addr; 1922 Dl_info dlinfo; 1923 1924 if (libjvm_base_addr == NULL) { 1925 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1926 libjvm_base_addr = (address)dlinfo.dli_fbase; 1927 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1928 } 1929 1930 if (dladdr((void *)addr, &dlinfo)) { 1931 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1932 } 1933 1934 return false; 1935 } 1936 1937 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1938 static dladdr1_func_type dladdr1_func = NULL; 1939 1940 bool os::dll_address_to_function_name(address addr, char *buf, 1941 int buflen, int * offset) { 1942 Dl_info dlinfo; 1943 1944 // dladdr1_func was initialized in os::init() 1945 if (dladdr1_func){ 1946 // yes, we have dladdr1 1947 1948 // Support for dladdr1 is checked at runtime; it may be 1949 // available even if the vm is built on a machine that does 1950 // not have dladdr1 support. Make sure there is a value for 1951 // RTLD_DL_SYMENT. 1952 #ifndef RTLD_DL_SYMENT 1953 #define RTLD_DL_SYMENT 1 1954 #endif 1955 #ifdef _LP64 1956 Elf64_Sym * info; 1957 #else 1958 Elf32_Sym * info; 1959 #endif 1960 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1961 RTLD_DL_SYMENT)) { 1962 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1963 if (buf != NULL) { 1964 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) 1965 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1966 } 1967 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1968 return true; 1969 } 1970 } 1971 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1972 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1973 buf, buflen, offset, dlinfo.dli_fname)) { 1974 return true; 1975 } 1976 } 1977 if (buf != NULL) buf[0] = '\0'; 1978 if (offset != NULL) *offset = -1; 1979 return false; 1980 } else { 1981 // no, only dladdr is available 1982 if (dladdr((void *)addr, &dlinfo)) { 1983 if (buf != NULL) { 1984 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) 1985 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1986 } 1987 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1988 return true; 1989 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1990 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1991 buf, buflen, offset, dlinfo.dli_fname)) { 1992 return true; 1993 } 1994 } 1995 if (buf != NULL) buf[0] = '\0'; 1996 if (offset != NULL) *offset = -1; 1997 return false; 1998 } 1999 } 2000 2001 bool os::dll_address_to_library_name(address addr, char* buf, 2002 int buflen, int* offset) { 2003 Dl_info dlinfo; 2004 2005 if (dladdr((void*)addr, &dlinfo)){ 2006 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 2007 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 2008 return true; 2009 } else { 2010 if (buf) buf[0] = '\0'; 2011 if (offset) *offset = -1; 2012 return false; 2013 } 2014 } 2015 2016 // Prints the names and full paths of all opened dynamic libraries 2017 // for current process 2018 void os::print_dll_info(outputStream * st) { 2019 Dl_info dli; 2020 void *handle; 2021 Link_map *map; 2022 Link_map *p; 2023 2024 st->print_cr("Dynamic libraries:"); st->flush(); 2025 2026 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 2027 st->print_cr("Error: Cannot print dynamic libraries."); 2028 return; 2029 } 2030 handle = dlopen(dli.dli_fname, RTLD_LAZY); 2031 if (handle == NULL) { 2032 st->print_cr("Error: Cannot print dynamic libraries."); 2033 return; 2034 } 2035 dlinfo(handle, RTLD_DI_LINKMAP, &map); 2036 if (map == NULL) { 2037 st->print_cr("Error: Cannot print dynamic libraries."); 2038 return; 2039 } 2040 2041 while (map->l_prev != NULL) 2042 map = map->l_prev; 2043 2044 while (map != NULL) { 2045 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2046 map = map->l_next; 2047 } 2048 2049 dlclose(handle); 2050 } 2051 2052 // Loads .dll/.so and 2053 // in case of error it checks if .dll/.so was built for the 2054 // same architecture as Hotspot is running on 2055 2056 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2057 { 2058 void * result= ::dlopen(filename, RTLD_LAZY); 2059 if (result != NULL) { 2060 // Successful loading 2061 return result; 2062 } 2063 2064 Elf32_Ehdr elf_head; 2065 2066 // Read system error message into ebuf 2067 // It may or may not be overwritten below 2068 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2069 ebuf[ebuflen-1]='\0'; 2070 int diag_msg_max_length=ebuflen-strlen(ebuf); 2071 char* diag_msg_buf=ebuf+strlen(ebuf); 2072 2073 if (diag_msg_max_length==0) { 2074 // No more space in ebuf for additional diagnostics message 2075 return NULL; 2076 } 2077 2078 2079 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2080 2081 if (file_descriptor < 0) { 2082 // Can't open library, report dlerror() message 2083 return NULL; 2084 } 2085 2086 bool failed_to_read_elf_head= 2087 (sizeof(elf_head)!= 2088 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2089 2090 ::close(file_descriptor); 2091 if (failed_to_read_elf_head) { 2092 // file i/o error - report dlerror() msg 2093 return NULL; 2094 } 2095 2096 typedef struct { 2097 Elf32_Half code; // Actual value as defined in elf.h 2098 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2099 char elf_class; // 32 or 64 bit 2100 char endianess; // MSB or LSB 2101 char* name; // String representation 2102 } arch_t; 2103 2104 static const arch_t arch_array[]={ 2105 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2106 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2107 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2108 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2109 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2110 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2111 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2112 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2113 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2114 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 2115 }; 2116 2117 #if (defined IA32) 2118 static Elf32_Half running_arch_code=EM_386; 2119 #elif (defined AMD64) 2120 static Elf32_Half running_arch_code=EM_X86_64; 2121 #elif (defined IA64) 2122 static Elf32_Half running_arch_code=EM_IA_64; 2123 #elif (defined __sparc) && (defined _LP64) 2124 static Elf32_Half running_arch_code=EM_SPARCV9; 2125 #elif (defined __sparc) && (!defined _LP64) 2126 static Elf32_Half running_arch_code=EM_SPARC; 2127 #elif (defined __powerpc64__) 2128 static Elf32_Half running_arch_code=EM_PPC64; 2129 #elif (defined __powerpc__) 2130 static Elf32_Half running_arch_code=EM_PPC; 2131 #elif (defined ARM) 2132 static Elf32_Half running_arch_code=EM_ARM; 2133 #else 2134 #error Method os::dll_load requires that one of following is defined:\ 2135 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 2136 #endif 2137 2138 // Identify compatability class for VM's architecture and library's architecture 2139 // Obtain string descriptions for architectures 2140 2141 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2142 int running_arch_index=-1; 2143 2144 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2145 if (running_arch_code == arch_array[i].code) { 2146 running_arch_index = i; 2147 } 2148 if (lib_arch.code == arch_array[i].code) { 2149 lib_arch.compat_class = arch_array[i].compat_class; 2150 lib_arch.name = arch_array[i].name; 2151 } 2152 } 2153 2154 assert(running_arch_index != -1, 2155 "Didn't find running architecture code (running_arch_code) in arch_array"); 2156 if (running_arch_index == -1) { 2157 // Even though running architecture detection failed 2158 // we may still continue with reporting dlerror() message 2159 return NULL; 2160 } 2161 2162 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2163 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2164 return NULL; 2165 } 2166 2167 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2168 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2169 return NULL; 2170 } 2171 2172 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2173 if ( lib_arch.name!=NULL ) { 2174 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2175 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2176 lib_arch.name, arch_array[running_arch_index].name); 2177 } else { 2178 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2179 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2180 lib_arch.code, 2181 arch_array[running_arch_index].name); 2182 } 2183 } 2184 2185 return NULL; 2186 } 2187 2188 void* os::dll_lookup(void* handle, const char* name) { 2189 return dlsym(handle, name); 2190 } 2191 2192 int os::stat(const char *path, struct stat *sbuf) { 2193 char pathbuf[MAX_PATH]; 2194 if (strlen(path) > MAX_PATH - 1) { 2195 errno = ENAMETOOLONG; 2196 return -1; 2197 } 2198 os::native_path(strcpy(pathbuf, path)); 2199 return ::stat(pathbuf, sbuf); 2200 } 2201 2202 static bool _print_ascii_file(const char* filename, outputStream* st) { 2203 int fd = ::open(filename, O_RDONLY); 2204 if (fd == -1) { 2205 return false; 2206 } 2207 2208 char buf[32]; 2209 int bytes; 2210 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2211 st->print_raw(buf, bytes); 2212 } 2213 2214 ::close(fd); 2215 2216 return true; 2217 } 2218 2219 void os::print_os_info_brief(outputStream* st) { 2220 os::Solaris::print_distro_info(st); 2221 2222 os::Posix::print_uname_info(st); 2223 2224 os::Solaris::print_libversion_info(st); 2225 } 2226 2227 void os::print_os_info(outputStream* st) { 2228 st->print("OS:"); 2229 2230 os::Solaris::print_distro_info(st); 2231 2232 os::Posix::print_uname_info(st); 2233 2234 os::Solaris::print_libversion_info(st); 2235 2236 os::Posix::print_rlimit_info(st); 2237 2238 os::Posix::print_load_average(st); 2239 } 2240 2241 void os::Solaris::print_distro_info(outputStream* st) { 2242 if (!_print_ascii_file("/etc/release", st)) { 2243 st->print("Solaris"); 2244 } 2245 st->cr(); 2246 } 2247 2248 void os::Solaris::print_libversion_info(outputStream* st) { 2249 if (os::Solaris::T2_libthread()) { 2250 st->print(" (T2 libthread)"); 2251 } 2252 else { 2253 st->print(" (T1 libthread)"); 2254 } 2255 st->cr(); 2256 } 2257 2258 static bool check_addr0(outputStream* st) { 2259 jboolean status = false; 2260 int fd = ::open("/proc/self/map",O_RDONLY); 2261 if (fd >= 0) { 2262 prmap_t p; 2263 while(::read(fd, &p, sizeof(p)) > 0) { 2264 if (p.pr_vaddr == 0x0) { 2265 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2266 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2267 st->print("Access:"); 2268 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2269 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2270 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2271 st->cr(); 2272 status = true; 2273 } 2274 ::close(fd); 2275 } 2276 } 2277 return status; 2278 } 2279 2280 void os::pd_print_cpu_info(outputStream* st) { 2281 // Nothing to do for now. 2282 } 2283 2284 void os::print_memory_info(outputStream* st) { 2285 st->print("Memory:"); 2286 st->print(" %dk page", os::vm_page_size()>>10); 2287 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2288 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2289 st->cr(); 2290 (void) check_addr0(st); 2291 } 2292 2293 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2294 // but they're the same for all the solaris architectures that we support. 2295 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2296 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2297 "ILL_COPROC", "ILL_BADSTK" }; 2298 2299 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2300 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2301 "FPE_FLTINV", "FPE_FLTSUB" }; 2302 2303 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2304 2305 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2306 2307 void os::print_siginfo(outputStream* st, void* siginfo) { 2308 st->print("siginfo:"); 2309 2310 const int buflen = 100; 2311 char buf[buflen]; 2312 siginfo_t *si = (siginfo_t*)siginfo; 2313 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2314 char *err = strerror(si->si_errno); 2315 if (si->si_errno != 0 && err != NULL) { 2316 st->print("si_errno=%s", err); 2317 } else { 2318 st->print("si_errno=%d", si->si_errno); 2319 } 2320 const int c = si->si_code; 2321 assert(c > 0, "unexpected si_code"); 2322 switch (si->si_signo) { 2323 case SIGILL: 2324 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2325 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2326 break; 2327 case SIGFPE: 2328 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2329 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2330 break; 2331 case SIGSEGV: 2332 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2333 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2334 break; 2335 case SIGBUS: 2336 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2337 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2338 break; 2339 default: 2340 st->print(", si_code=%d", si->si_code); 2341 // no si_addr 2342 } 2343 2344 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2345 UseSharedSpaces) { 2346 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2347 if (mapinfo->is_in_shared_space(si->si_addr)) { 2348 st->print("\n\nError accessing class data sharing archive." \ 2349 " Mapped file inaccessible during execution, " \ 2350 " possible disk/network problem."); 2351 } 2352 } 2353 st->cr(); 2354 } 2355 2356 // Moved from whole group, because we need them here for diagnostic 2357 // prints. 2358 #define OLDMAXSIGNUM 32 2359 static int Maxsignum = 0; 2360 static int *ourSigFlags = NULL; 2361 2362 extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2363 2364 int os::Solaris::get_our_sigflags(int sig) { 2365 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2366 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2367 return ourSigFlags[sig]; 2368 } 2369 2370 void os::Solaris::set_our_sigflags(int sig, int flags) { 2371 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2372 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2373 ourSigFlags[sig] = flags; 2374 } 2375 2376 2377 static const char* get_signal_handler_name(address handler, 2378 char* buf, int buflen) { 2379 int offset; 2380 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2381 if (found) { 2382 // skip directory names 2383 const char *p1, *p2; 2384 p1 = buf; 2385 size_t len = strlen(os::file_separator()); 2386 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2387 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2388 } else { 2389 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2390 } 2391 return buf; 2392 } 2393 2394 static void print_signal_handler(outputStream* st, int sig, 2395 char* buf, size_t buflen) { 2396 struct sigaction sa; 2397 2398 sigaction(sig, NULL, &sa); 2399 2400 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2401 2402 address handler = (sa.sa_flags & SA_SIGINFO) 2403 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2404 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2405 2406 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2407 st->print("SIG_DFL"); 2408 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2409 st->print("SIG_IGN"); 2410 } else { 2411 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2412 } 2413 2414 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2415 2416 address rh = VMError::get_resetted_sighandler(sig); 2417 // May be, handler was resetted by VMError? 2418 if(rh != NULL) { 2419 handler = rh; 2420 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2421 } 2422 2423 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2424 2425 // Check: is it our handler? 2426 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2427 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2428 // It is our signal handler 2429 // check for flags 2430 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2431 st->print( 2432 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2433 os::Solaris::get_our_sigflags(sig)); 2434 } 2435 } 2436 st->cr(); 2437 } 2438 2439 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2440 st->print_cr("Signal Handlers:"); 2441 print_signal_handler(st, SIGSEGV, buf, buflen); 2442 print_signal_handler(st, SIGBUS , buf, buflen); 2443 print_signal_handler(st, SIGFPE , buf, buflen); 2444 print_signal_handler(st, SIGPIPE, buf, buflen); 2445 print_signal_handler(st, SIGXFSZ, buf, buflen); 2446 print_signal_handler(st, SIGILL , buf, buflen); 2447 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2448 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2449 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2450 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2451 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2452 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2453 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2454 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2455 } 2456 2457 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2458 2459 // Find the full path to the current module, libjvm.so 2460 void os::jvm_path(char *buf, jint buflen) { 2461 // Error checking. 2462 if (buflen < MAXPATHLEN) { 2463 assert(false, "must use a large-enough buffer"); 2464 buf[0] = '\0'; 2465 return; 2466 } 2467 // Lazy resolve the path to current module. 2468 if (saved_jvm_path[0] != 0) { 2469 strcpy(buf, saved_jvm_path); 2470 return; 2471 } 2472 2473 Dl_info dlinfo; 2474 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2475 assert(ret != 0, "cannot locate libjvm"); 2476 realpath((char *)dlinfo.dli_fname, buf); 2477 2478 if (Arguments::created_by_gamma_launcher()) { 2479 // Support for the gamma launcher. Typical value for buf is 2480 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2481 // the right place in the string, then assume we are installed in a JDK and 2482 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2483 // up the path so it looks like libjvm.so is installed there (append a 2484 // fake suffix hotspot/libjvm.so). 2485 const char *p = buf + strlen(buf) - 1; 2486 for (int count = 0; p > buf && count < 5; ++count) { 2487 for (--p; p > buf && *p != '/'; --p) 2488 /* empty */ ; 2489 } 2490 2491 if (strncmp(p, "/jre/lib/", 9) != 0) { 2492 // Look for JAVA_HOME in the environment. 2493 char* java_home_var = ::getenv("JAVA_HOME"); 2494 if (java_home_var != NULL && java_home_var[0] != 0) { 2495 char cpu_arch[12]; 2496 char* jrelib_p; 2497 int len; 2498 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2499 #ifdef _LP64 2500 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2501 if (strcmp(cpu_arch, "sparc") == 0) { 2502 strcat(cpu_arch, "v9"); 2503 } else if (strcmp(cpu_arch, "i386") == 0) { 2504 strcpy(cpu_arch, "amd64"); 2505 } 2506 #endif 2507 // Check the current module name "libjvm.so". 2508 p = strrchr(buf, '/'); 2509 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2510 2511 realpath(java_home_var, buf); 2512 // determine if this is a legacy image or modules image 2513 // modules image doesn't have "jre" subdirectory 2514 len = strlen(buf); 2515 jrelib_p = buf + len; 2516 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2517 if (0 != access(buf, F_OK)) { 2518 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2519 } 2520 2521 if (0 == access(buf, F_OK)) { 2522 // Use current module name "libjvm.so" 2523 len = strlen(buf); 2524 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2525 } else { 2526 // Go back to path of .so 2527 realpath((char *)dlinfo.dli_fname, buf); 2528 } 2529 } 2530 } 2531 } 2532 2533 strcpy(saved_jvm_path, buf); 2534 } 2535 2536 2537 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2538 // no prefix required, not even "_" 2539 } 2540 2541 2542 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2543 // no suffix required 2544 } 2545 2546 // This method is a copy of JDK's sysGetLastErrorString 2547 // from src/solaris/hpi/src/system_md.c 2548 2549 size_t os::lasterror(char *buf, size_t len) { 2550 2551 if (errno == 0) return 0; 2552 2553 const char *s = ::strerror(errno); 2554 size_t n = ::strlen(s); 2555 if (n >= len) { 2556 n = len - 1; 2557 } 2558 ::strncpy(buf, s, n); 2559 buf[n] = '\0'; 2560 return n; 2561 } 2562 2563 2564 // sun.misc.Signal 2565 2566 extern "C" { 2567 static void UserHandler(int sig, void *siginfo, void *context) { 2568 // Ctrl-C is pressed during error reporting, likely because the error 2569 // handler fails to abort. Let VM die immediately. 2570 if (sig == SIGINT && is_error_reported()) { 2571 os::die(); 2572 } 2573 2574 os::signal_notify(sig); 2575 // We do not need to reinstate the signal handler each time... 2576 } 2577 } 2578 2579 void* os::user_handler() { 2580 return CAST_FROM_FN_PTR(void*, UserHandler); 2581 } 2582 2583 extern "C" { 2584 typedef void (*sa_handler_t)(int); 2585 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2586 } 2587 2588 void* os::signal(int signal_number, void* handler) { 2589 struct sigaction sigAct, oldSigAct; 2590 sigfillset(&(sigAct.sa_mask)); 2591 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2592 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2593 2594 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2595 // -1 means registration failed 2596 return (void *)-1; 2597 2598 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2599 } 2600 2601 void os::signal_raise(int signal_number) { 2602 raise(signal_number); 2603 } 2604 2605 /* 2606 * The following code is moved from os.cpp for making this 2607 * code platform specific, which it is by its very nature. 2608 */ 2609 2610 // a counter for each possible signal value 2611 static int Sigexit = 0; 2612 static int Maxlibjsigsigs; 2613 static jint *pending_signals = NULL; 2614 static int *preinstalled_sigs = NULL; 2615 static struct sigaction *chainedsigactions = NULL; 2616 static sema_t sig_sem; 2617 typedef int (*version_getting_t)(); 2618 version_getting_t os::Solaris::get_libjsig_version = NULL; 2619 static int libjsigversion = NULL; 2620 2621 int os::sigexitnum_pd() { 2622 assert(Sigexit > 0, "signal memory not yet initialized"); 2623 return Sigexit; 2624 } 2625 2626 void os::Solaris::init_signal_mem() { 2627 // Initialize signal structures 2628 Maxsignum = SIGRTMAX; 2629 Sigexit = Maxsignum+1; 2630 assert(Maxsignum >0, "Unable to obtain max signal number"); 2631 2632 Maxlibjsigsigs = Maxsignum; 2633 2634 // pending_signals has one int per signal 2635 // The additional signal is for SIGEXIT - exit signal to signal_thread 2636 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2637 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2638 2639 if (UseSignalChaining) { 2640 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2641 * (Maxsignum + 1), mtInternal); 2642 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2643 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2644 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2645 } 2646 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal); 2647 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2648 } 2649 2650 void os::signal_init_pd() { 2651 int ret; 2652 2653 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2654 assert(ret == 0, "sema_init() failed"); 2655 } 2656 2657 void os::signal_notify(int signal_number) { 2658 int ret; 2659 2660 Atomic::inc(&pending_signals[signal_number]); 2661 ret = ::sema_post(&sig_sem); 2662 assert(ret == 0, "sema_post() failed"); 2663 } 2664 2665 static int check_pending_signals(bool wait_for_signal) { 2666 int ret; 2667 while (true) { 2668 for (int i = 0; i < Sigexit + 1; i++) { 2669 jint n = pending_signals[i]; 2670 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2671 return i; 2672 } 2673 } 2674 if (!wait_for_signal) { 2675 return -1; 2676 } 2677 JavaThread *thread = JavaThread::current(); 2678 ThreadBlockInVM tbivm(thread); 2679 2680 bool threadIsSuspended; 2681 do { 2682 thread->set_suspend_equivalent(); 2683 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2684 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2685 ; 2686 assert(ret == 0, "sema_wait() failed"); 2687 2688 // were we externally suspended while we were waiting? 2689 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2690 if (threadIsSuspended) { 2691 // 2692 // The semaphore has been incremented, but while we were waiting 2693 // another thread suspended us. We don't want to continue running 2694 // while suspended because that would surprise the thread that 2695 // suspended us. 2696 // 2697 ret = ::sema_post(&sig_sem); 2698 assert(ret == 0, "sema_post() failed"); 2699 2700 thread->java_suspend_self(); 2701 } 2702 } while (threadIsSuspended); 2703 } 2704 } 2705 2706 int os::signal_lookup() { 2707 return check_pending_signals(false); 2708 } 2709 2710 int os::signal_wait() { 2711 return check_pending_signals(true); 2712 } 2713 2714 //////////////////////////////////////////////////////////////////////////////// 2715 // Virtual Memory 2716 2717 static int page_size = -1; 2718 2719 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2720 // clear this var if support is not available. 2721 static bool has_map_align = true; 2722 2723 int os::vm_page_size() { 2724 assert(page_size != -1, "must call os::init"); 2725 return page_size; 2726 } 2727 2728 // Solaris allocates memory by pages. 2729 int os::vm_allocation_granularity() { 2730 assert(page_size != -1, "must call os::init"); 2731 return page_size; 2732 } 2733 2734 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2735 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2736 size_t size = bytes; 2737 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2738 if (res != NULL) { 2739 if (UseNUMAInterleaving) { 2740 numa_make_global(addr, bytes); 2741 } 2742 return true; 2743 } 2744 return false; 2745 } 2746 2747 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2748 bool exec) { 2749 if (commit_memory(addr, bytes, exec)) { 2750 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) { 2751 // If the large page size has been set and the VM 2752 // is using large pages, use the large page size 2753 // if it is smaller than the alignment hint. This is 2754 // a case where the VM wants to use a larger alignment size 2755 // for its own reasons but still want to use large pages 2756 // (which is what matters to setting the mpss range. 2757 size_t page_size = 0; 2758 if (large_page_size() < alignment_hint) { 2759 assert(UseLargePages, "Expected to be here for large page use only"); 2760 page_size = large_page_size(); 2761 } else { 2762 // If the alignment hint is less than the large page 2763 // size, the VM wants a particular alignment (thus the hint) 2764 // for internal reasons. Try to set the mpss range using 2765 // the alignment_hint. 2766 page_size = alignment_hint; 2767 } 2768 // Since this is a hint, ignore any failures. 2769 (void)Solaris::set_mpss_range(addr, bytes, page_size); 2770 } 2771 return true; 2772 } 2773 return false; 2774 } 2775 2776 // Uncommit the pages in a specified region. 2777 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2778 if (madvise(addr, bytes, MADV_FREE) < 0) { 2779 debug_only(warning("MADV_FREE failed.")); 2780 return; 2781 } 2782 } 2783 2784 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2785 return os::commit_memory(addr, size); 2786 } 2787 2788 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2789 return os::uncommit_memory(addr, size); 2790 } 2791 2792 // Change the page size in a given range. 2793 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2794 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2795 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2796 if (UseLargePages && UseMPSS) { 2797 Solaris::set_mpss_range(addr, bytes, alignment_hint); 2798 } 2799 } 2800 2801 // Tell the OS to make the range local to the first-touching LWP 2802 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2803 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2804 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2805 debug_only(warning("MADV_ACCESS_LWP failed.")); 2806 } 2807 } 2808 2809 // Tell the OS that this range would be accessed from different LWPs. 2810 void os::numa_make_global(char *addr, size_t bytes) { 2811 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2812 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2813 debug_only(warning("MADV_ACCESS_MANY failed.")); 2814 } 2815 } 2816 2817 // Get the number of the locality groups. 2818 size_t os::numa_get_groups_num() { 2819 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2820 return n != -1 ? n : 1; 2821 } 2822 2823 // Get a list of leaf locality groups. A leaf lgroup is group that 2824 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2825 // board. An LWP is assigned to one of these groups upon creation. 2826 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2827 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2828 ids[0] = 0; 2829 return 1; 2830 } 2831 int result_size = 0, top = 1, bottom = 0, cur = 0; 2832 for (int k = 0; k < size; k++) { 2833 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2834 (Solaris::lgrp_id_t*)&ids[top], size - top); 2835 if (r == -1) { 2836 ids[0] = 0; 2837 return 1; 2838 } 2839 if (!r) { 2840 // That's a leaf node. 2841 assert (bottom <= cur, "Sanity check"); 2842 // Check if the node has memory 2843 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2844 NULL, 0, LGRP_RSRC_MEM) > 0) { 2845 ids[bottom++] = ids[cur]; 2846 } 2847 } 2848 top += r; 2849 cur++; 2850 } 2851 if (bottom == 0) { 2852 // Handle a situation, when the OS reports no memory available. 2853 // Assume UMA architecture. 2854 ids[0] = 0; 2855 return 1; 2856 } 2857 return bottom; 2858 } 2859 2860 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2861 bool os::numa_topology_changed() { 2862 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2863 if (is_stale != -1 && is_stale) { 2864 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2865 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2866 assert(c != 0, "Failure to initialize LGRP API"); 2867 Solaris::set_lgrp_cookie(c); 2868 return true; 2869 } 2870 return false; 2871 } 2872 2873 // Get the group id of the current LWP. 2874 int os::numa_get_group_id() { 2875 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2876 if (lgrp_id == -1) { 2877 return 0; 2878 } 2879 const int size = os::numa_get_groups_num(); 2880 int *ids = (int*)alloca(size * sizeof(int)); 2881 2882 // Get the ids of all lgroups with memory; r is the count. 2883 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2884 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2885 if (r <= 0) { 2886 return 0; 2887 } 2888 return ids[os::random() % r]; 2889 } 2890 2891 // Request information about the page. 2892 bool os::get_page_info(char *start, page_info* info) { 2893 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2894 uint64_t addr = (uintptr_t)start; 2895 uint64_t outdata[2]; 2896 uint_t validity = 0; 2897 2898 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2899 return false; 2900 } 2901 2902 info->size = 0; 2903 info->lgrp_id = -1; 2904 2905 if ((validity & 1) != 0) { 2906 if ((validity & 2) != 0) { 2907 info->lgrp_id = outdata[0]; 2908 } 2909 if ((validity & 4) != 0) { 2910 info->size = outdata[1]; 2911 } 2912 return true; 2913 } 2914 return false; 2915 } 2916 2917 // Scan the pages from start to end until a page different than 2918 // the one described in the info parameter is encountered. 2919 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2920 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2921 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2922 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 2923 uint_t validity[MAX_MEMINFO_CNT]; 2924 2925 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2926 uint64_t p = (uint64_t)start; 2927 while (p < (uint64_t)end) { 2928 addrs[0] = p; 2929 size_t addrs_count = 1; 2930 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2931 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2932 addrs_count++; 2933 } 2934 2935 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2936 return NULL; 2937 } 2938 2939 size_t i = 0; 2940 for (; i < addrs_count; i++) { 2941 if ((validity[i] & 1) != 0) { 2942 if ((validity[i] & 4) != 0) { 2943 if (outdata[types * i + 1] != page_expected->size) { 2944 break; 2945 } 2946 } else 2947 if (page_expected->size != 0) { 2948 break; 2949 } 2950 2951 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2952 if (outdata[types * i] != page_expected->lgrp_id) { 2953 break; 2954 } 2955 } 2956 } else { 2957 return NULL; 2958 } 2959 } 2960 2961 if (i != addrs_count) { 2962 if ((validity[i] & 2) != 0) { 2963 page_found->lgrp_id = outdata[types * i]; 2964 } else { 2965 page_found->lgrp_id = -1; 2966 } 2967 if ((validity[i] & 4) != 0) { 2968 page_found->size = outdata[types * i + 1]; 2969 } else { 2970 page_found->size = 0; 2971 } 2972 return (char*)addrs[i]; 2973 } 2974 2975 p = addrs[addrs_count - 1] + page_size; 2976 } 2977 return end; 2978 } 2979 2980 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2981 size_t size = bytes; 2982 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2983 // uncommitted page. Otherwise, the read/write might succeed if we 2984 // have enough swap space to back the physical page. 2985 return 2986 NULL != Solaris::mmap_chunk(addr, size, 2987 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2988 PROT_NONE); 2989 } 2990 2991 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2992 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2993 2994 if (b == MAP_FAILED) { 2995 return NULL; 2996 } 2997 return b; 2998 } 2999 3000 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 3001 char* addr = requested_addr; 3002 int flags = MAP_PRIVATE | MAP_NORESERVE; 3003 3004 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 3005 3006 if (fixed) { 3007 flags |= MAP_FIXED; 3008 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 3009 flags |= MAP_ALIGN; 3010 addr = (char*) alignment_hint; 3011 } 3012 3013 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3014 // uncommitted page. Otherwise, the read/write might succeed if we 3015 // have enough swap space to back the physical page. 3016 return mmap_chunk(addr, bytes, flags, PROT_NONE); 3017 } 3018 3019 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 3020 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 3021 3022 guarantee(requested_addr == NULL || requested_addr == addr, 3023 "OS failed to return requested mmap address."); 3024 return addr; 3025 } 3026 3027 // Reserve memory at an arbitrary address, only if that area is 3028 // available (and not reserved for something else). 3029 3030 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3031 const int max_tries = 10; 3032 char* base[max_tries]; 3033 size_t size[max_tries]; 3034 3035 // Solaris adds a gap between mmap'ed regions. The size of the gap 3036 // is dependent on the requested size and the MMU. Our initial gap 3037 // value here is just a guess and will be corrected later. 3038 bool had_top_overlap = false; 3039 bool have_adjusted_gap = false; 3040 size_t gap = 0x400000; 3041 3042 // Assert only that the size is a multiple of the page size, since 3043 // that's all that mmap requires, and since that's all we really know 3044 // about at this low abstraction level. If we need higher alignment, 3045 // we can either pass an alignment to this method or verify alignment 3046 // in one of the methods further up the call chain. See bug 5044738. 3047 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3048 3049 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 3050 // Give it a try, if the kernel honors the hint we can return immediately. 3051 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 3052 3053 volatile int err = errno; 3054 if (addr == requested_addr) { 3055 return addr; 3056 } else if (addr != NULL) { 3057 pd_unmap_memory(addr, bytes); 3058 } 3059 3060 if (PrintMiscellaneous && Verbose) { 3061 char buf[256]; 3062 buf[0] = '\0'; 3063 if (addr == NULL) { 3064 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 3065 } 3066 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 3067 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 3068 "%s", bytes, requested_addr, addr, buf); 3069 } 3070 3071 // Address hint method didn't work. Fall back to the old method. 3072 // In theory, once SNV becomes our oldest supported platform, this 3073 // code will no longer be needed. 3074 // 3075 // Repeatedly allocate blocks until the block is allocated at the 3076 // right spot. Give up after max_tries. 3077 int i; 3078 for (i = 0; i < max_tries; ++i) { 3079 base[i] = reserve_memory(bytes); 3080 3081 if (base[i] != NULL) { 3082 // Is this the block we wanted? 3083 if (base[i] == requested_addr) { 3084 size[i] = bytes; 3085 break; 3086 } 3087 3088 // check that the gap value is right 3089 if (had_top_overlap && !have_adjusted_gap) { 3090 size_t actual_gap = base[i-1] - base[i] - bytes; 3091 if (gap != actual_gap) { 3092 // adjust the gap value and retry the last 2 allocations 3093 assert(i > 0, "gap adjustment code problem"); 3094 have_adjusted_gap = true; // adjust the gap only once, just in case 3095 gap = actual_gap; 3096 if (PrintMiscellaneous && Verbose) { 3097 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3098 } 3099 unmap_memory(base[i], bytes); 3100 unmap_memory(base[i-1], size[i-1]); 3101 i-=2; 3102 continue; 3103 } 3104 } 3105 3106 // Does this overlap the block we wanted? Give back the overlapped 3107 // parts and try again. 3108 // 3109 // There is still a bug in this code: if top_overlap == bytes, 3110 // the overlap is offset from requested region by the value of gap. 3111 // In this case giving back the overlapped part will not work, 3112 // because we'll give back the entire block at base[i] and 3113 // therefore the subsequent allocation will not generate a new gap. 3114 // This could be fixed with a new algorithm that used larger 3115 // or variable size chunks to find the requested region - 3116 // but such a change would introduce additional complications. 3117 // It's rare enough that the planets align for this bug, 3118 // so we'll just wait for a fix for 6204603/5003415 which 3119 // will provide a mmap flag to allow us to avoid this business. 3120 3121 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3122 if (top_overlap >= 0 && top_overlap < bytes) { 3123 had_top_overlap = true; 3124 unmap_memory(base[i], top_overlap); 3125 base[i] += top_overlap; 3126 size[i] = bytes - top_overlap; 3127 } else { 3128 size_t bottom_overlap = base[i] + bytes - requested_addr; 3129 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3130 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3131 warning("attempt_reserve_memory_at: possible alignment bug"); 3132 } 3133 unmap_memory(requested_addr, bottom_overlap); 3134 size[i] = bytes - bottom_overlap; 3135 } else { 3136 size[i] = bytes; 3137 } 3138 } 3139 } 3140 } 3141 3142 // Give back the unused reserved pieces. 3143 3144 for (int j = 0; j < i; ++j) { 3145 if (base[j] != NULL) { 3146 unmap_memory(base[j], size[j]); 3147 } 3148 } 3149 3150 return (i < max_tries) ? requested_addr : NULL; 3151 } 3152 3153 bool os::pd_release_memory(char* addr, size_t bytes) { 3154 size_t size = bytes; 3155 return munmap(addr, size) == 0; 3156 } 3157 3158 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3159 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3160 "addr must be page aligned"); 3161 int retVal = mprotect(addr, bytes, prot); 3162 return retVal == 0; 3163 } 3164 3165 // Protect memory (Used to pass readonly pages through 3166 // JNI GetArray<type>Elements with empty arrays.) 3167 // Also, used for serialization page and for compressed oops null pointer 3168 // checking. 3169 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3170 bool is_committed) { 3171 unsigned int p = 0; 3172 switch (prot) { 3173 case MEM_PROT_NONE: p = PROT_NONE; break; 3174 case MEM_PROT_READ: p = PROT_READ; break; 3175 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3176 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3177 default: 3178 ShouldNotReachHere(); 3179 } 3180 // is_committed is unused. 3181 return solaris_mprotect(addr, bytes, p); 3182 } 3183 3184 // guard_memory and unguard_memory only happens within stack guard pages. 3185 // Since ISM pertains only to the heap, guard and unguard memory should not 3186 /// happen with an ISM region. 3187 bool os::guard_memory(char* addr, size_t bytes) { 3188 return solaris_mprotect(addr, bytes, PROT_NONE); 3189 } 3190 3191 bool os::unguard_memory(char* addr, size_t bytes) { 3192 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3193 } 3194 3195 // Large page support 3196 3197 // UseLargePages is the master flag to enable/disable large page memory. 3198 // UseMPSS and UseISM are supported for compatibility reasons. Their combined 3199 // effects can be described in the following table: 3200 // 3201 // UseLargePages UseMPSS UseISM 3202 // false * * => UseLargePages is the master switch, turning 3203 // it off will turn off both UseMPSS and 3204 // UseISM. VM will not use large page memory 3205 // regardless the settings of UseMPSS/UseISM. 3206 // true false false => Unless future Solaris provides other 3207 // mechanism to use large page memory, this 3208 // combination is equivalent to -UseLargePages, 3209 // VM will not use large page memory 3210 // true true false => JVM will use MPSS for large page memory. 3211 // This is the default behavior. 3212 // true false true => JVM will use ISM for large page memory. 3213 // true true true => JVM will use ISM if it is available. 3214 // Otherwise, JVM will fall back to MPSS. 3215 // Becaues ISM is now available on all 3216 // supported Solaris versions, this combination 3217 // is equivalent to +UseISM -UseMPSS. 3218 3219 static size_t _large_page_size = 0; 3220 3221 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) { 3222 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address 3223 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc 3224 // can support multiple page sizes. 3225 3226 // Don't bother to probe page size because getpagesizes() comes with MPSS. 3227 // ISM is only recommended on old Solaris where there is no MPSS support. 3228 // Simply choose a conservative value as default. 3229 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes : 3230 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M) 3231 ARM_ONLY(2 * M); 3232 3233 // ISM is available on all supported Solaris versions 3234 return true; 3235 } 3236 3237 // Insertion sort for small arrays (descending order). 3238 static void insertion_sort_descending(size_t* array, int len) { 3239 for (int i = 0; i < len; i++) { 3240 size_t val = array[i]; 3241 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3242 size_t tmp = array[key]; 3243 array[key] = array[key - 1]; 3244 array[key - 1] = tmp; 3245 } 3246 } 3247 } 3248 3249 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) { 3250 const unsigned int usable_count = VM_Version::page_size_count(); 3251 if (usable_count == 1) { 3252 return false; 3253 } 3254 3255 // Find the right getpagesizes interface. When solaris 11 is the minimum 3256 // build platform, getpagesizes() (without the '2') can be called directly. 3257 typedef int (*gps_t)(size_t[], int); 3258 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 3259 if (gps_func == NULL) { 3260 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 3261 if (gps_func == NULL) { 3262 if (warn) { 3263 warning("MPSS is not supported by the operating system."); 3264 } 3265 return false; 3266 } 3267 } 3268 3269 // Fill the array of page sizes. 3270 int n = (*gps_func)(_page_sizes, page_sizes_max); 3271 assert(n > 0, "Solaris bug?"); 3272 3273 if (n == page_sizes_max) { 3274 // Add a sentinel value (necessary only if the array was completely filled 3275 // since it is static (zeroed at initialization)). 3276 _page_sizes[--n] = 0; 3277 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3278 } 3279 assert(_page_sizes[n] == 0, "missing sentinel"); 3280 trace_page_sizes("available page sizes", _page_sizes, n); 3281 3282 if (n == 1) return false; // Only one page size available. 3283 3284 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3285 // select up to usable_count elements. First sort the array, find the first 3286 // acceptable value, then copy the usable sizes to the top of the array and 3287 // trim the rest. Make sure to include the default page size :-). 3288 // 3289 // A better policy could get rid of the 4M limit by taking the sizes of the 3290 // important VM memory regions (java heap and possibly the code cache) into 3291 // account. 3292 insertion_sort_descending(_page_sizes, n); 3293 const size_t size_limit = 3294 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3295 int beg; 3296 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3297 const int end = MIN2((int)usable_count, n) - 1; 3298 for (int cur = 0; cur < end; ++cur, ++beg) { 3299 _page_sizes[cur] = _page_sizes[beg]; 3300 } 3301 _page_sizes[end] = vm_page_size(); 3302 _page_sizes[end + 1] = 0; 3303 3304 if (_page_sizes[end] > _page_sizes[end - 1]) { 3305 // Default page size is not the smallest; sort again. 3306 insertion_sort_descending(_page_sizes, end + 1); 3307 } 3308 *page_size = _page_sizes[0]; 3309 3310 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 3311 return true; 3312 } 3313 3314 void os::large_page_init() { 3315 if (!UseLargePages) { 3316 UseISM = false; 3317 UseMPSS = false; 3318 return; 3319 } 3320 3321 // print a warning if any large page related flag is specified on command line 3322 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3323 !FLAG_IS_DEFAULT(UseISM) || 3324 !FLAG_IS_DEFAULT(UseMPSS) || 3325 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3326 UseISM = UseISM && 3327 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size); 3328 if (UseISM) { 3329 // ISM disables MPSS to be compatible with old JDK behavior 3330 UseMPSS = false; 3331 _page_sizes[0] = _large_page_size; 3332 _page_sizes[1] = vm_page_size(); 3333 } 3334 3335 UseMPSS = UseMPSS && 3336 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3337 3338 UseLargePages = UseISM || UseMPSS; 3339 } 3340 3341 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) { 3342 // Signal to OS that we want large pages for addresses 3343 // from addr, addr + bytes 3344 struct memcntl_mha mpss_struct; 3345 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3346 mpss_struct.mha_pagesize = align; 3347 mpss_struct.mha_flags = 0; 3348 if (memcntl(start, bytes, MC_HAT_ADVISE, 3349 (caddr_t) &mpss_struct, 0, 0) < 0) { 3350 debug_only(warning("Attempt to use MPSS failed.")); 3351 return false; 3352 } 3353 return true; 3354 } 3355 3356 char* os::reserve_memory_special(size_t size, char* addr, bool exec) { 3357 // "exec" is passed in but not used. Creating the shared image for 3358 // the code cache doesn't have an SHM_X executable permission to check. 3359 assert(UseLargePages && UseISM, "only for ISM large pages"); 3360 3361 char* retAddr = NULL; 3362 int shmid; 3363 key_t ismKey; 3364 3365 bool warn_on_failure = UseISM && 3366 (!FLAG_IS_DEFAULT(UseLargePages) || 3367 !FLAG_IS_DEFAULT(UseISM) || 3368 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3369 ); 3370 char msg[128]; 3371 3372 ismKey = IPC_PRIVATE; 3373 3374 // Create a large shared memory region to attach to based on size. 3375 // Currently, size is the total size of the heap 3376 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT); 3377 if (shmid == -1){ 3378 if (warn_on_failure) { 3379 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3380 warning(msg); 3381 } 3382 return NULL; 3383 } 3384 3385 // Attach to the region 3386 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W); 3387 int err = errno; 3388 3389 // Remove shmid. If shmat() is successful, the actual shared memory segment 3390 // will be deleted when it's detached by shmdt() or when the process 3391 // terminates. If shmat() is not successful this will remove the shared 3392 // segment immediately. 3393 shmctl(shmid, IPC_RMID, NULL); 3394 3395 if (retAddr == (char *) -1) { 3396 if (warn_on_failure) { 3397 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3398 warning(msg); 3399 } 3400 return NULL; 3401 } 3402 if ((retAddr != NULL) && UseNUMAInterleaving) { 3403 numa_make_global(retAddr, size); 3404 } 3405 3406 // The memory is committed 3407 NMTTrackOp op(NMTTrackOp::ReserveAndCommitOp); 3408 op.execute_op((address)retAddr, size, 0, CALLER_PC); 3409 3410 return retAddr; 3411 } 3412 3413 bool os::release_memory_special(char* base, size_t bytes) { 3414 NMTTrackOp op(NMTTrackOp::ReleaseOp); 3415 // detaching the SHM segment will also delete it, see reserve_memory_special() 3416 int rslt = shmdt(base); 3417 if (rslt == 0) { 3418 op.execute_op((address)base, bytes); 3419 return true; 3420 } else { 3421 op.abort_op(); 3422 return false; 3423 } 3424 } 3425 3426 size_t os::large_page_size() { 3427 return _large_page_size; 3428 } 3429 3430 // MPSS allows application to commit large page memory on demand; with ISM 3431 // the entire memory region must be allocated as shared memory. 3432 bool os::can_commit_large_page_memory() { 3433 return UseISM ? false : true; 3434 } 3435 3436 bool os::can_execute_large_page_memory() { 3437 return UseISM ? false : true; 3438 } 3439 3440 static int os_sleep(jlong millis, bool interruptible) { 3441 const jlong limit = INT_MAX; 3442 jlong prevtime; 3443 int res; 3444 3445 while (millis > limit) { 3446 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3447 return res; 3448 millis -= limit; 3449 } 3450 3451 // Restart interrupted polls with new parameters until the proper delay 3452 // has been completed. 3453 3454 prevtime = getTimeMillis(); 3455 3456 while (millis > 0) { 3457 jlong newtime; 3458 3459 if (!interruptible) { 3460 // Following assert fails for os::yield_all: 3461 // assert(!thread->is_Java_thread(), "must not be java thread"); 3462 res = poll(NULL, 0, millis); 3463 } else { 3464 JavaThread *jt = JavaThread::current(); 3465 3466 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3467 os::Solaris::clear_interrupted); 3468 } 3469 3470 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3471 // thread.Interrupt. 3472 3473 // See c/r 6751923. Poll can return 0 before time 3474 // has elapsed if time is set via clock_settime (as NTP does). 3475 // res == 0 if poll timed out (see man poll RETURN VALUES) 3476 // using the logic below checks that we really did 3477 // sleep at least "millis" if not we'll sleep again. 3478 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) { 3479 newtime = getTimeMillis(); 3480 assert(newtime >= prevtime, "time moving backwards"); 3481 /* Doing prevtime and newtime in microseconds doesn't help precision, 3482 and trying to round up to avoid lost milliseconds can result in a 3483 too-short delay. */ 3484 millis -= newtime - prevtime; 3485 if(millis <= 0) 3486 return OS_OK; 3487 prevtime = newtime; 3488 } else 3489 return res; 3490 } 3491 3492 return OS_OK; 3493 } 3494 3495 // Read calls from inside the vm need to perform state transitions 3496 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3497 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3498 } 3499 3500 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3501 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3502 } 3503 3504 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3505 assert(thread == Thread::current(), "thread consistency check"); 3506 3507 // TODO-FIXME: this should be removed. 3508 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3509 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3510 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3511 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3512 // is fooled into believing that the system is making progress. In the code below we block the 3513 // the watcher thread while safepoint is in progress so that it would not appear as though the 3514 // system is making progress. 3515 if (!Solaris::T2_libthread() && 3516 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3517 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3518 // the entire safepoint, the watcher thread will line up here during the safepoint. 3519 Threads_lock->lock_without_safepoint_check(); 3520 Threads_lock->unlock(); 3521 } 3522 3523 if (thread->is_Java_thread()) { 3524 // This is a JavaThread so we honor the _thread_blocked protocol 3525 // even for sleeps of 0 milliseconds. This was originally done 3526 // as a workaround for bug 4338139. However, now we also do it 3527 // to honor the suspend-equivalent protocol. 3528 3529 JavaThread *jt = (JavaThread *) thread; 3530 ThreadBlockInVM tbivm(jt); 3531 3532 jt->set_suspend_equivalent(); 3533 // cleared by handle_special_suspend_equivalent_condition() or 3534 // java_suspend_self() via check_and_wait_while_suspended() 3535 3536 int ret_code; 3537 if (millis <= 0) { 3538 thr_yield(); 3539 ret_code = 0; 3540 } else { 3541 // The original sleep() implementation did not create an 3542 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3543 // I'm preserving that decision for now. 3544 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3545 3546 ret_code = os_sleep(millis, interruptible); 3547 } 3548 3549 // were we externally suspended while we were waiting? 3550 jt->check_and_wait_while_suspended(); 3551 3552 return ret_code; 3553 } 3554 3555 // non-JavaThread from this point on: 3556 3557 if (millis <= 0) { 3558 thr_yield(); 3559 return 0; 3560 } 3561 3562 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3563 3564 return os_sleep(millis, interruptible); 3565 } 3566 3567 int os::naked_sleep() { 3568 // %% make the sleep time an integer flag. for now use 1 millisec. 3569 return os_sleep(1, false); 3570 } 3571 3572 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3573 void os::infinite_sleep() { 3574 while (true) { // sleep forever ... 3575 ::sleep(100); // ... 100 seconds at a time 3576 } 3577 } 3578 3579 // Used to convert frequent JVM_Yield() to nops 3580 bool os::dont_yield() { 3581 if (DontYieldALot) { 3582 static hrtime_t last_time = 0; 3583 hrtime_t diff = getTimeNanos() - last_time; 3584 3585 if (diff < DontYieldALotInterval * 1000000) 3586 return true; 3587 3588 last_time += diff; 3589 3590 return false; 3591 } 3592 else { 3593 return false; 3594 } 3595 } 3596 3597 // Caveat: Solaris os::yield() causes a thread-state transition whereas 3598 // the linux and win32 implementations do not. This should be checked. 3599 3600 void os::yield() { 3601 // Yields to all threads with same or greater priority 3602 os::sleep(Thread::current(), 0, false); 3603 } 3604 3605 // Note that yield semantics are defined by the scheduling class to which 3606 // the thread currently belongs. Typically, yield will _not yield to 3607 // other equal or higher priority threads that reside on the dispatch queues 3608 // of other CPUs. 3609 3610 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3611 3612 3613 // On Solaris we found that yield_all doesn't always yield to all other threads. 3614 // There have been cases where there is a thread ready to execute but it doesn't 3615 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3616 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3617 // SIGWAITING signal which will cause a new lwp to be created. So we count the 3618 // number of times yield_all is called in the one loop and increase the sleep 3619 // time after 8 attempts. If this fails too we increase the concurrency level 3620 // so that the starving thread would get an lwp 3621 3622 void os::yield_all(int attempts) { 3623 // Yields to all threads, including threads with lower priorities 3624 if (attempts == 0) { 3625 os::sleep(Thread::current(), 1, false); 3626 } else { 3627 int iterations = attempts % 30; 3628 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3629 // thr_setconcurrency and _getconcurrency make sense only under T1. 3630 int noofLWPS = thr_getconcurrency(); 3631 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3632 thr_setconcurrency(thr_getconcurrency() + 1); 3633 } 3634 } else if (iterations < 25) { 3635 os::sleep(Thread::current(), 1, false); 3636 } else { 3637 os::sleep(Thread::current(), 10, false); 3638 } 3639 } 3640 } 3641 3642 // Called from the tight loops to possibly influence time-sharing heuristics 3643 void os::loop_breaker(int attempts) { 3644 os::yield_all(attempts); 3645 } 3646 3647 3648 // Interface for setting lwp priorities. If we are using T2 libthread, 3649 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3650 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3651 // function is meaningless in this mode so we must adjust the real lwp's priority 3652 // The routines below implement the getting and setting of lwp priorities. 3653 // 3654 // Note: There are three priority scales used on Solaris. Java priotities 3655 // which range from 1 to 10, libthread "thr_setprio" scale which range 3656 // from 0 to 127, and the current scheduling class of the process we 3657 // are running in. This is typically from -60 to +60. 3658 // The setting of the lwp priorities in done after a call to thr_setprio 3659 // so Java priorities are mapped to libthread priorities and we map from 3660 // the latter to lwp priorities. We don't keep priorities stored in 3661 // Java priorities since some of our worker threads want to set priorities 3662 // higher than all Java threads. 3663 // 3664 // For related information: 3665 // (1) man -s 2 priocntl 3666 // (2) man -s 4 priocntl 3667 // (3) man dispadmin 3668 // = librt.so 3669 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3670 // = ps -cL <pid> ... to validate priority. 3671 // = sched_get_priority_min and _max 3672 // pthread_create 3673 // sched_setparam 3674 // pthread_setschedparam 3675 // 3676 // Assumptions: 3677 // + We assume that all threads in the process belong to the same 3678 // scheduling class. IE. an homogenous process. 3679 // + Must be root or in IA group to change change "interactive" attribute. 3680 // Priocntl() will fail silently. The only indication of failure is when 3681 // we read-back the value and notice that it hasn't changed. 3682 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3683 // + For RT, change timeslice as well. Invariant: 3684 // constant "priority integral" 3685 // Konst == TimeSlice * (60-Priority) 3686 // Given a priority, compute appropriate timeslice. 3687 // + Higher numerical values have higher priority. 3688 3689 // sched class attributes 3690 typedef struct { 3691 int schedPolicy; // classID 3692 int maxPrio; 3693 int minPrio; 3694 } SchedInfo; 3695 3696 3697 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3698 3699 #ifdef ASSERT 3700 static int ReadBackValidate = 1; 3701 #endif 3702 static int myClass = 0; 3703 static int myMin = 0; 3704 static int myMax = 0; 3705 static int myCur = 0; 3706 static bool priocntl_enable = false; 3707 3708 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4 3709 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3710 3711 // Call the version of priocntl suitable for all supported versions 3712 // of Solaris. We need to call through this wrapper so that we can 3713 // build on Solaris 9 and run on Solaris 8, 9 and 10. 3714 // 3715 // This code should be removed if we ever stop supporting Solaris 8 3716 // and earlier releases. 3717 3718 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3719 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3720 static priocntl_type priocntl_ptr = priocntl_stub; 3721 3722 // Stub to set the value of the real pointer, and then call the real 3723 // function. 3724 3725 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) { 3726 // Try Solaris 8- name only. 3727 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl"); 3728 guarantee(tmp != NULL, "priocntl function not found."); 3729 priocntl_ptr = tmp; 3730 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg); 3731 } 3732 3733 3734 // lwp_priocntl_init 3735 // 3736 // Try to determine the priority scale for our process. 3737 // 3738 // Return errno or 0 if OK. 3739 // 3740 static 3741 int lwp_priocntl_init () 3742 { 3743 int rslt; 3744 pcinfo_t ClassInfo; 3745 pcparms_t ParmInfo; 3746 int i; 3747 3748 if (!UseThreadPriorities) return 0; 3749 3750 // We are using Bound threads, we need to determine our priority ranges 3751 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3752 // If ThreadPriorityPolicy is 1, switch tables 3753 if (ThreadPriorityPolicy == 1) { 3754 for (i = 0 ; i < CriticalPriority+1; i++) 3755 os::java_to_os_priority[i] = prio_policy1[i]; 3756 } 3757 if (UseCriticalJavaThreadPriority) { 3758 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3759 // See set_native_priority() and set_lwp_class_and_priority(). 3760 // Save original MaxPriority mapping in case attempt to 3761 // use critical priority fails. 3762 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3763 // Set negative to distinguish from other priorities 3764 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3765 } 3766 } 3767 // Not using Bound Threads, set to ThreadPolicy 1 3768 else { 3769 for ( i = 0 ; i < CriticalPriority+1; i++ ) { 3770 os::java_to_os_priority[i] = prio_policy1[i]; 3771 } 3772 return 0; 3773 } 3774 3775 // Get IDs for a set of well-known scheduling classes. 3776 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3777 // the system. We should have a loop that iterates over the 3778 // classID values, which are known to be "small" integers. 3779 3780 strcpy(ClassInfo.pc_clname, "TS"); 3781 ClassInfo.pc_cid = -1; 3782 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3783 if (rslt < 0) return errno; 3784 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3785 tsLimits.schedPolicy = ClassInfo.pc_cid; 3786 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3787 tsLimits.minPrio = -tsLimits.maxPrio; 3788 3789 strcpy(ClassInfo.pc_clname, "IA"); 3790 ClassInfo.pc_cid = -1; 3791 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3792 if (rslt < 0) return errno; 3793 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3794 iaLimits.schedPolicy = ClassInfo.pc_cid; 3795 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3796 iaLimits.minPrio = -iaLimits.maxPrio; 3797 3798 strcpy(ClassInfo.pc_clname, "RT"); 3799 ClassInfo.pc_cid = -1; 3800 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3801 if (rslt < 0) return errno; 3802 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3803 rtLimits.schedPolicy = ClassInfo.pc_cid; 3804 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3805 rtLimits.minPrio = 0; 3806 3807 strcpy(ClassInfo.pc_clname, "FX"); 3808 ClassInfo.pc_cid = -1; 3809 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3810 if (rslt < 0) return errno; 3811 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3812 fxLimits.schedPolicy = ClassInfo.pc_cid; 3813 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3814 fxLimits.minPrio = 0; 3815 3816 // Query our "current" scheduling class. 3817 // This will normally be IA, TS or, rarely, FX or RT. 3818 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3819 ParmInfo.pc_cid = PC_CLNULL; 3820 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3821 if (rslt < 0) return errno; 3822 myClass = ParmInfo.pc_cid; 3823 3824 // We now know our scheduling classId, get specific information 3825 // about the class. 3826 ClassInfo.pc_cid = myClass; 3827 ClassInfo.pc_clname[0] = 0; 3828 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3829 if (rslt < 0) return errno; 3830 3831 if (ThreadPriorityVerbose) { 3832 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3833 } 3834 3835 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3836 ParmInfo.pc_cid = PC_CLNULL; 3837 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3838 if (rslt < 0) return errno; 3839 3840 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3841 myMin = rtLimits.minPrio; 3842 myMax = rtLimits.maxPrio; 3843 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3844 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3845 myMin = iaLimits.minPrio; 3846 myMax = iaLimits.maxPrio; 3847 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3848 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3849 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3850 myMin = tsLimits.minPrio; 3851 myMax = tsLimits.maxPrio; 3852 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3853 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3854 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3855 myMin = fxLimits.minPrio; 3856 myMax = fxLimits.maxPrio; 3857 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3858 } else { 3859 // No clue - punt 3860 if (ThreadPriorityVerbose) 3861 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3862 return EINVAL; // no clue, punt 3863 } 3864 3865 if (ThreadPriorityVerbose) { 3866 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3867 } 3868 3869 priocntl_enable = true; // Enable changing priorities 3870 return 0; 3871 } 3872 3873 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3874 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3875 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3876 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3877 3878 3879 // scale_to_lwp_priority 3880 // 3881 // Convert from the libthread "thr_setprio" scale to our current 3882 // lwp scheduling class scale. 3883 // 3884 static 3885 int scale_to_lwp_priority (int rMin, int rMax, int x) 3886 { 3887 int v; 3888 3889 if (x == 127) return rMax; // avoid round-down 3890 v = (((x*(rMax-rMin)))/128)+rMin; 3891 return v; 3892 } 3893 3894 3895 // set_lwp_class_and_priority 3896 // 3897 // Set the class and priority of the lwp. This call should only 3898 // be made when using bound threads (T2 threads are bound by default). 3899 // 3900 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3901 int newPrio, int new_class, bool scale) { 3902 int rslt; 3903 int Actual, Expected, prv; 3904 pcparms_t ParmInfo; // for GET-SET 3905 #ifdef ASSERT 3906 pcparms_t ReadBack; // for readback 3907 #endif 3908 3909 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3910 // Query current values. 3911 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3912 // Cache "pcparms_t" in global ParmCache. 3913 // TODO: elide set-to-same-value 3914 3915 // If something went wrong on init, don't change priorities. 3916 if ( !priocntl_enable ) { 3917 if (ThreadPriorityVerbose) 3918 tty->print_cr("Trying to set priority but init failed, ignoring"); 3919 return EINVAL; 3920 } 3921 3922 // If lwp hasn't started yet, just return 3923 // the _start routine will call us again. 3924 if ( lwpid <= 0 ) { 3925 if (ThreadPriorityVerbose) { 3926 tty->print_cr ("deferring the set_lwp_class_and_priority of thread " 3927 INTPTR_FORMAT " to %d, lwpid not set", 3928 ThreadID, newPrio); 3929 } 3930 return 0; 3931 } 3932 3933 if (ThreadPriorityVerbose) { 3934 tty->print_cr ("set_lwp_class_and_priority(" 3935 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3936 ThreadID, lwpid, newPrio); 3937 } 3938 3939 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3940 ParmInfo.pc_cid = PC_CLNULL; 3941 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3942 if (rslt < 0) return errno; 3943 3944 int cur_class = ParmInfo.pc_cid; 3945 ParmInfo.pc_cid = (id_t)new_class; 3946 3947 if (new_class == rtLimits.schedPolicy) { 3948 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3949 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3950 rtLimits.maxPrio, newPrio) 3951 : newPrio; 3952 rtInfo->rt_tqsecs = RT_NOCHANGE; 3953 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3954 if (ThreadPriorityVerbose) { 3955 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3956 } 3957 } else if (new_class == iaLimits.schedPolicy) { 3958 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3959 int maxClamped = MIN2(iaLimits.maxPrio, 3960 cur_class == new_class 3961 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3962 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3963 maxClamped, newPrio) 3964 : newPrio; 3965 iaInfo->ia_uprilim = cur_class == new_class 3966 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3967 iaInfo->ia_mode = IA_NOCHANGE; 3968 if (ThreadPriorityVerbose) { 3969 tty->print_cr("IA: [%d...%d] %d->%d\n", 3970 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3971 } 3972 } else if (new_class == tsLimits.schedPolicy) { 3973 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3974 int maxClamped = MIN2(tsLimits.maxPrio, 3975 cur_class == new_class 3976 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3977 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3978 maxClamped, newPrio) 3979 : newPrio; 3980 tsInfo->ts_uprilim = cur_class == new_class 3981 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3982 if (ThreadPriorityVerbose) { 3983 tty->print_cr("TS: [%d...%d] %d->%d\n", 3984 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3985 } 3986 } else if (new_class == fxLimits.schedPolicy) { 3987 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3988 int maxClamped = MIN2(fxLimits.maxPrio, 3989 cur_class == new_class 3990 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3991 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3992 maxClamped, newPrio) 3993 : newPrio; 3994 fxInfo->fx_uprilim = cur_class == new_class 3995 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3996 fxInfo->fx_tqsecs = FX_NOCHANGE; 3997 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3998 if (ThreadPriorityVerbose) { 3999 tty->print_cr("FX: [%d...%d] %d->%d\n", 4000 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 4001 } 4002 } else { 4003 if (ThreadPriorityVerbose) { 4004 tty->print_cr("Unknown new scheduling class %d\n", new_class); 4005 } 4006 return EINVAL; // no clue, punt 4007 } 4008 4009 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 4010 if (ThreadPriorityVerbose && rslt) { 4011 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 4012 } 4013 if (rslt < 0) return errno; 4014 4015 #ifdef ASSERT 4016 // Sanity check: read back what we just attempted to set. 4017 // In theory it could have changed in the interim ... 4018 // 4019 // The priocntl system call is tricky. 4020 // Sometimes it'll validate the priority value argument and 4021 // return EINVAL if unhappy. At other times it fails silently. 4022 // Readbacks are prudent. 4023 4024 if (!ReadBackValidate) return 0; 4025 4026 memset(&ReadBack, 0, sizeof(pcparms_t)); 4027 ReadBack.pc_cid = PC_CLNULL; 4028 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 4029 assert(rslt >= 0, "priocntl failed"); 4030 Actual = Expected = 0xBAD; 4031 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 4032 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 4033 Actual = RTPRI(ReadBack)->rt_pri; 4034 Expected = RTPRI(ParmInfo)->rt_pri; 4035 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 4036 Actual = IAPRI(ReadBack)->ia_upri; 4037 Expected = IAPRI(ParmInfo)->ia_upri; 4038 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 4039 Actual = TSPRI(ReadBack)->ts_upri; 4040 Expected = TSPRI(ParmInfo)->ts_upri; 4041 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 4042 Actual = FXPRI(ReadBack)->fx_upri; 4043 Expected = FXPRI(ParmInfo)->fx_upri; 4044 } else { 4045 if (ThreadPriorityVerbose) { 4046 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 4047 ParmInfo.pc_cid); 4048 } 4049 } 4050 4051 if (Actual != Expected) { 4052 if (ThreadPriorityVerbose) { 4053 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 4054 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 4055 } 4056 } 4057 #endif 4058 4059 return 0; 4060 } 4061 4062 // Solaris only gives access to 128 real priorities at a time, 4063 // so we expand Java's ten to fill this range. This would be better 4064 // if we dynamically adjusted relative priorities. 4065 // 4066 // The ThreadPriorityPolicy option allows us to select 2 different 4067 // priority scales. 4068 // 4069 // ThreadPriorityPolicy=0 4070 // Since the Solaris' default priority is MaximumPriority, we do not 4071 // set a priority lower than Max unless a priority lower than 4072 // NormPriority is requested. 4073 // 4074 // ThreadPriorityPolicy=1 4075 // This mode causes the priority table to get filled with 4076 // linear values. NormPriority get's mapped to 50% of the 4077 // Maximum priority an so on. This will cause VM threads 4078 // to get unfair treatment against other Solaris processes 4079 // which do not explicitly alter their thread priorities. 4080 // 4081 4082 int os::java_to_os_priority[CriticalPriority + 1] = { 4083 -99999, // 0 Entry should never be used 4084 4085 0, // 1 MinPriority 4086 32, // 2 4087 64, // 3 4088 4089 96, // 4 4090 127, // 5 NormPriority 4091 127, // 6 4092 4093 127, // 7 4094 127, // 8 4095 127, // 9 NearMaxPriority 4096 4097 127, // 10 MaxPriority 4098 4099 -criticalPrio // 11 CriticalPriority 4100 }; 4101 4102 OSReturn os::set_native_priority(Thread* thread, int newpri) { 4103 OSThread* osthread = thread->osthread(); 4104 4105 // Save requested priority in case the thread hasn't been started 4106 osthread->set_native_priority(newpri); 4107 4108 // Check for critical priority request 4109 bool fxcritical = false; 4110 if (newpri == -criticalPrio) { 4111 fxcritical = true; 4112 newpri = criticalPrio; 4113 } 4114 4115 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 4116 if (!UseThreadPriorities) return OS_OK; 4117 4118 int status = 0; 4119 4120 if (!fxcritical) { 4121 // Use thr_setprio only if we have a priority that thr_setprio understands 4122 status = thr_setprio(thread->osthread()->thread_id(), newpri); 4123 } 4124 4125 if (os::Solaris::T2_libthread() || 4126 (UseBoundThreads && osthread->is_vm_created())) { 4127 int lwp_status = 4128 set_lwp_class_and_priority(osthread->thread_id(), 4129 osthread->lwp_id(), 4130 newpri, 4131 fxcritical ? fxLimits.schedPolicy : myClass, 4132 !fxcritical); 4133 if (lwp_status != 0 && fxcritical) { 4134 // Try again, this time without changing the scheduling class 4135 newpri = java_MaxPriority_to_os_priority; 4136 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 4137 osthread->lwp_id(), 4138 newpri, myClass, false); 4139 } 4140 status |= lwp_status; 4141 } 4142 return (status == 0) ? OS_OK : OS_ERR; 4143 } 4144 4145 4146 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 4147 int p; 4148 if ( !UseThreadPriorities ) { 4149 *priority_ptr = NormalPriority; 4150 return OS_OK; 4151 } 4152 int status = thr_getprio(thread->osthread()->thread_id(), &p); 4153 if (status != 0) { 4154 return OS_ERR; 4155 } 4156 *priority_ptr = p; 4157 return OS_OK; 4158 } 4159 4160 4161 // Hint to the underlying OS that a task switch would not be good. 4162 // Void return because it's a hint and can fail. 4163 void os::hint_no_preempt() { 4164 schedctl_start(schedctl_init()); 4165 } 4166 4167 void os::interrupt(Thread* thread) { 4168 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4169 4170 OSThread* osthread = thread->osthread(); 4171 4172 int isInterrupted = osthread->interrupted(); 4173 if (!isInterrupted) { 4174 osthread->set_interrupted(true); 4175 OrderAccess::fence(); 4176 // os::sleep() is implemented with either poll (NULL,0,timeout) or 4177 // by parking on _SleepEvent. If the former, thr_kill will unwedge 4178 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 4179 ParkEvent * const slp = thread->_SleepEvent ; 4180 if (slp != NULL) slp->unpark() ; 4181 } 4182 4183 // For JSR166: unpark after setting status but before thr_kill -dl 4184 if (thread->is_Java_thread()) { 4185 ((JavaThread*)thread)->parker()->unpark(); 4186 } 4187 4188 // Handle interruptible wait() ... 4189 ParkEvent * const ev = thread->_ParkEvent ; 4190 if (ev != NULL) ev->unpark() ; 4191 4192 // When events are used everywhere for os::sleep, then this thr_kill 4193 // will only be needed if UseVMInterruptibleIO is true. 4194 4195 if (!isInterrupted) { 4196 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 4197 assert_status(status == 0, status, "thr_kill"); 4198 4199 // Bump thread interruption counter 4200 RuntimeService::record_thread_interrupt_signaled_count(); 4201 } 4202 } 4203 4204 4205 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 4206 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4207 4208 OSThread* osthread = thread->osthread(); 4209 4210 bool res = osthread->interrupted(); 4211 4212 // NOTE that since there is no "lock" around these two operations, 4213 // there is the possibility that the interrupted flag will be 4214 // "false" but that the interrupt event will be set. This is 4215 // intentional. The effect of this is that Object.wait() will appear 4216 // to have a spurious wakeup, which is not harmful, and the 4217 // possibility is so rare that it is not worth the added complexity 4218 // to add yet another lock. It has also been recommended not to put 4219 // the interrupted flag into the os::Solaris::Event structure, 4220 // because it hides the issue. 4221 if (res && clear_interrupted) { 4222 osthread->set_interrupted(false); 4223 } 4224 return res; 4225 } 4226 4227 4228 void os::print_statistics() { 4229 } 4230 4231 int os::message_box(const char* title, const char* message) { 4232 int i; 4233 fdStream err(defaultStream::error_fd()); 4234 for (i = 0; i < 78; i++) err.print_raw("="); 4235 err.cr(); 4236 err.print_raw_cr(title); 4237 for (i = 0; i < 78; i++) err.print_raw("-"); 4238 err.cr(); 4239 err.print_raw_cr(message); 4240 for (i = 0; i < 78; i++) err.print_raw("="); 4241 err.cr(); 4242 4243 char buf[16]; 4244 // Prevent process from exiting upon "read error" without consuming all CPU 4245 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4246 4247 return buf[0] == 'y' || buf[0] == 'Y'; 4248 } 4249 4250 // A lightweight implementation that does not suspend the target thread and 4251 // thus returns only a hint. Used for profiling only! 4252 ExtendedPC os::get_thread_pc(Thread* thread) { 4253 // Make sure that it is called by the watcher and the Threads lock is owned. 4254 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4255 // For now, is only used to profile the VM Thread 4256 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4257 ExtendedPC epc; 4258 4259 GetThreadPC_Callback cb(ProfileVM_lock); 4260 OSThread *osthread = thread->osthread(); 4261 const int time_to_wait = 400; // 400ms wait for initial response 4262 int status = cb.interrupt(thread, time_to_wait); 4263 4264 if (cb.is_done() ) { 4265 epc = cb.addr(); 4266 } else { 4267 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status", 4268 osthread->thread_id(), status);); 4269 // epc is already NULL 4270 } 4271 return epc; 4272 } 4273 4274 4275 // This does not do anything on Solaris. This is basically a hook for being 4276 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4277 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4278 f(value, method, args, thread); 4279 } 4280 4281 // This routine may be used by user applications as a "hook" to catch signals. 4282 // The user-defined signal handler must pass unrecognized signals to this 4283 // routine, and if it returns true (non-zero), then the signal handler must 4284 // return immediately. If the flag "abort_if_unrecognized" is true, then this 4285 // routine will never retun false (zero), but instead will execute a VM panic 4286 // routine kill the process. 4287 // 4288 // If this routine returns false, it is OK to call it again. This allows 4289 // the user-defined signal handler to perform checks either before or after 4290 // the VM performs its own checks. Naturally, the user code would be making 4291 // a serious error if it tried to handle an exception (such as a null check 4292 // or breakpoint) that the VM was generating for its own correct operation. 4293 // 4294 // This routine may recognize any of the following kinds of signals: 4295 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4296 // os::Solaris::SIGasync 4297 // It should be consulted by handlers for any of those signals. 4298 // It explicitly does not recognize os::Solaris::SIGinterrupt 4299 // 4300 // The caller of this routine must pass in the three arguments supplied 4301 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 4302 // field of the structure passed to sigaction(). This routine assumes that 4303 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4304 // 4305 // Note that the VM will print warnings if it detects conflicting signal 4306 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4307 // 4308 extern "C" JNIEXPORT int 4309 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, 4310 int abort_if_unrecognized); 4311 4312 4313 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4314 int orig_errno = errno; // Preserve errno value over signal handler. 4315 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4316 errno = orig_errno; 4317 } 4318 4319 /* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4320 is needed to provoke threads blocked on IO to return an EINTR 4321 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4322 does NOT participate in signal chaining due to requirement for 4323 NOT setting SA_RESTART to make EINTR work. */ 4324 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4325 if (UseSignalChaining) { 4326 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4327 if (actp && actp->sa_handler) { 4328 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4329 } 4330 } 4331 } 4332 4333 // This boolean allows users to forward their own non-matching signals 4334 // to JVM_handle_solaris_signal, harmlessly. 4335 bool os::Solaris::signal_handlers_are_installed = false; 4336 4337 // For signal-chaining 4338 bool os::Solaris::libjsig_is_loaded = false; 4339 typedef struct sigaction *(*get_signal_t)(int); 4340 get_signal_t os::Solaris::get_signal_action = NULL; 4341 4342 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4343 struct sigaction *actp = NULL; 4344 4345 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4346 // Retrieve the old signal handler from libjsig 4347 actp = (*get_signal_action)(sig); 4348 } 4349 if (actp == NULL) { 4350 // Retrieve the preinstalled signal handler from jvm 4351 actp = get_preinstalled_handler(sig); 4352 } 4353 4354 return actp; 4355 } 4356 4357 static bool call_chained_handler(struct sigaction *actp, int sig, 4358 siginfo_t *siginfo, void *context) { 4359 // Call the old signal handler 4360 if (actp->sa_handler == SIG_DFL) { 4361 // It's more reasonable to let jvm treat it as an unexpected exception 4362 // instead of taking the default action. 4363 return false; 4364 } else if (actp->sa_handler != SIG_IGN) { 4365 if ((actp->sa_flags & SA_NODEFER) == 0) { 4366 // automaticlly block the signal 4367 sigaddset(&(actp->sa_mask), sig); 4368 } 4369 4370 sa_handler_t hand; 4371 sa_sigaction_t sa; 4372 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4373 // retrieve the chained handler 4374 if (siginfo_flag_set) { 4375 sa = actp->sa_sigaction; 4376 } else { 4377 hand = actp->sa_handler; 4378 } 4379 4380 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4381 actp->sa_handler = SIG_DFL; 4382 } 4383 4384 // try to honor the signal mask 4385 sigset_t oset; 4386 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4387 4388 // call into the chained handler 4389 if (siginfo_flag_set) { 4390 (*sa)(sig, siginfo, context); 4391 } else { 4392 (*hand)(sig); 4393 } 4394 4395 // restore the signal mask 4396 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4397 } 4398 // Tell jvm's signal handler the signal is taken care of. 4399 return true; 4400 } 4401 4402 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4403 bool chained = false; 4404 // signal-chaining 4405 if (UseSignalChaining) { 4406 struct sigaction *actp = get_chained_signal_action(sig); 4407 if (actp != NULL) { 4408 chained = call_chained_handler(actp, sig, siginfo, context); 4409 } 4410 } 4411 return chained; 4412 } 4413 4414 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4415 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4416 if (preinstalled_sigs[sig] != 0) { 4417 return &chainedsigactions[sig]; 4418 } 4419 return NULL; 4420 } 4421 4422 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4423 4424 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4425 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4426 chainedsigactions[sig] = oldAct; 4427 preinstalled_sigs[sig] = 1; 4428 } 4429 4430 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4431 // Check for overwrite. 4432 struct sigaction oldAct; 4433 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4434 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4435 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4436 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4437 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4438 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4439 if (AllowUserSignalHandlers || !set_installed) { 4440 // Do not overwrite; user takes responsibility to forward to us. 4441 return; 4442 } else if (UseSignalChaining) { 4443 if (oktochain) { 4444 // save the old handler in jvm 4445 save_preinstalled_handler(sig, oldAct); 4446 } else { 4447 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4448 } 4449 // libjsig also interposes the sigaction() call below and saves the 4450 // old sigaction on it own. 4451 } else { 4452 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4453 "%#lx for signal %d.", (long)oldhand, sig)); 4454 } 4455 } 4456 4457 struct sigaction sigAct; 4458 sigfillset(&(sigAct.sa_mask)); 4459 sigAct.sa_handler = SIG_DFL; 4460 4461 sigAct.sa_sigaction = signalHandler; 4462 // Handle SIGSEGV on alternate signal stack if 4463 // not using stack banging 4464 if (!UseStackBanging && sig == SIGSEGV) { 4465 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4466 // Interruptible i/o requires SA_RESTART cleared so EINTR 4467 // is returned instead of restarting system calls 4468 } else if (sig == os::Solaris::SIGinterrupt()) { 4469 sigemptyset(&sigAct.sa_mask); 4470 sigAct.sa_handler = NULL; 4471 sigAct.sa_flags = SA_SIGINFO; 4472 sigAct.sa_sigaction = sigINTRHandler; 4473 } else { 4474 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4475 } 4476 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4477 4478 sigaction(sig, &sigAct, &oldAct); 4479 4480 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4481 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4482 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4483 } 4484 4485 4486 #define DO_SIGNAL_CHECK(sig) \ 4487 if (!sigismember(&check_signal_done, sig)) \ 4488 os::Solaris::check_signal_handler(sig) 4489 4490 // This method is a periodic task to check for misbehaving JNI applications 4491 // under CheckJNI, we can add any periodic checks here 4492 4493 void os::run_periodic_checks() { 4494 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4495 // thereby preventing a NULL checks. 4496 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4497 4498 if (check_signals == false) return; 4499 4500 // SEGV and BUS if overridden could potentially prevent 4501 // generation of hs*.log in the event of a crash, debugging 4502 // such a case can be very challenging, so we absolutely 4503 // check for the following for a good measure: 4504 DO_SIGNAL_CHECK(SIGSEGV); 4505 DO_SIGNAL_CHECK(SIGILL); 4506 DO_SIGNAL_CHECK(SIGFPE); 4507 DO_SIGNAL_CHECK(SIGBUS); 4508 DO_SIGNAL_CHECK(SIGPIPE); 4509 DO_SIGNAL_CHECK(SIGXFSZ); 4510 4511 // ReduceSignalUsage allows the user to override these handlers 4512 // see comments at the very top and jvm_solaris.h 4513 if (!ReduceSignalUsage) { 4514 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4515 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4516 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4517 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4518 } 4519 4520 // See comments above for using JVM1/JVM2 and UseAltSigs 4521 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4522 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4523 4524 } 4525 4526 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4527 4528 static os_sigaction_t os_sigaction = NULL; 4529 4530 void os::Solaris::check_signal_handler(int sig) { 4531 char buf[O_BUFLEN]; 4532 address jvmHandler = NULL; 4533 4534 struct sigaction act; 4535 if (os_sigaction == NULL) { 4536 // only trust the default sigaction, in case it has been interposed 4537 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4538 if (os_sigaction == NULL) return; 4539 } 4540 4541 os_sigaction(sig, (struct sigaction*)NULL, &act); 4542 4543 address thisHandler = (act.sa_flags & SA_SIGINFO) 4544 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4545 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4546 4547 4548 switch(sig) { 4549 case SIGSEGV: 4550 case SIGBUS: 4551 case SIGFPE: 4552 case SIGPIPE: 4553 case SIGXFSZ: 4554 case SIGILL: 4555 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4556 break; 4557 4558 case SHUTDOWN1_SIGNAL: 4559 case SHUTDOWN2_SIGNAL: 4560 case SHUTDOWN3_SIGNAL: 4561 case BREAK_SIGNAL: 4562 jvmHandler = (address)user_handler(); 4563 break; 4564 4565 default: 4566 int intrsig = os::Solaris::SIGinterrupt(); 4567 int asynsig = os::Solaris::SIGasync(); 4568 4569 if (sig == intrsig) { 4570 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4571 } else if (sig == asynsig) { 4572 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4573 } else { 4574 return; 4575 } 4576 break; 4577 } 4578 4579 4580 if (thisHandler != jvmHandler) { 4581 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4582 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4583 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4584 // No need to check this sig any longer 4585 sigaddset(&check_signal_done, sig); 4586 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4587 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4588 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4589 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4590 // No need to check this sig any longer 4591 sigaddset(&check_signal_done, sig); 4592 } 4593 4594 // Print all the signal handler state 4595 if (sigismember(&check_signal_done, sig)) { 4596 print_signal_handlers(tty, buf, O_BUFLEN); 4597 } 4598 4599 } 4600 4601 void os::Solaris::install_signal_handlers() { 4602 bool libjsigdone = false; 4603 signal_handlers_are_installed = true; 4604 4605 // signal-chaining 4606 typedef void (*signal_setting_t)(); 4607 signal_setting_t begin_signal_setting = NULL; 4608 signal_setting_t end_signal_setting = NULL; 4609 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4610 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4611 if (begin_signal_setting != NULL) { 4612 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4613 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4614 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4615 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4616 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4617 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4618 libjsig_is_loaded = true; 4619 if (os::Solaris::get_libjsig_version != NULL) { 4620 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4621 } 4622 assert(UseSignalChaining, "should enable signal-chaining"); 4623 } 4624 if (libjsig_is_loaded) { 4625 // Tell libjsig jvm is setting signal handlers 4626 (*begin_signal_setting)(); 4627 } 4628 4629 set_signal_handler(SIGSEGV, true, true); 4630 set_signal_handler(SIGPIPE, true, true); 4631 set_signal_handler(SIGXFSZ, true, true); 4632 set_signal_handler(SIGBUS, true, true); 4633 set_signal_handler(SIGILL, true, true); 4634 set_signal_handler(SIGFPE, true, true); 4635 4636 4637 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4638 4639 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4640 // can not register overridable signals which might be > 32 4641 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4642 // Tell libjsig jvm has finished setting signal handlers 4643 (*end_signal_setting)(); 4644 libjsigdone = true; 4645 } 4646 } 4647 4648 // Never ok to chain our SIGinterrupt 4649 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4650 set_signal_handler(os::Solaris::SIGasync(), true, true); 4651 4652 if (libjsig_is_loaded && !libjsigdone) { 4653 // Tell libjsig jvm finishes setting signal handlers 4654 (*end_signal_setting)(); 4655 } 4656 4657 // We don't activate signal checker if libjsig is in place, we trust ourselves 4658 // and if UserSignalHandler is installed all bets are off. 4659 // Log that signal checking is off only if -verbose:jni is specified. 4660 if (CheckJNICalls) { 4661 if (libjsig_is_loaded) { 4662 if (PrintJNIResolving) { 4663 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4664 } 4665 check_signals = false; 4666 } 4667 if (AllowUserSignalHandlers) { 4668 if (PrintJNIResolving) { 4669 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4670 } 4671 check_signals = false; 4672 } 4673 } 4674 } 4675 4676 4677 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4678 4679 const char * signames[] = { 4680 "SIG0", 4681 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4682 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4683 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4684 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4685 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4686 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4687 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4688 "SIGCANCEL", "SIGLOST" 4689 }; 4690 4691 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4692 if (0 < exception_code && exception_code <= SIGRTMAX) { 4693 // signal 4694 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4695 jio_snprintf(buf, size, "%s", signames[exception_code]); 4696 } else { 4697 jio_snprintf(buf, size, "SIG%d", exception_code); 4698 } 4699 return buf; 4700 } else { 4701 return NULL; 4702 } 4703 } 4704 4705 // (Static) wrappers for the new libthread API 4706 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4707 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4708 int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4709 int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4710 int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4711 4712 // (Static) wrapper for getisax(2) call. 4713 os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4714 4715 // (Static) wrappers for the liblgrp API 4716 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4717 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4718 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4719 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4720 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4721 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4722 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4723 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4724 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4725 4726 // (Static) wrapper for meminfo() call. 4727 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4728 4729 static address resolve_symbol_lazy(const char* name) { 4730 address addr = (address) dlsym(RTLD_DEFAULT, name); 4731 if(addr == NULL) { 4732 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4733 addr = (address) dlsym(RTLD_NEXT, name); 4734 } 4735 return addr; 4736 } 4737 4738 static address resolve_symbol(const char* name) { 4739 address addr = resolve_symbol_lazy(name); 4740 if(addr == NULL) { 4741 fatal(dlerror()); 4742 } 4743 return addr; 4744 } 4745 4746 4747 4748 // isT2_libthread() 4749 // 4750 // Routine to determine if we are currently using the new T2 libthread. 4751 // 4752 // We determine if we are using T2 by reading /proc/self/lstatus and 4753 // looking for a thread with the ASLWP bit set. If we find this status 4754 // bit set, we must assume that we are NOT using T2. The T2 team 4755 // has approved this algorithm. 4756 // 4757 // We need to determine if we are running with the new T2 libthread 4758 // since setting native thread priorities is handled differently 4759 // when using this library. All threads created using T2 are bound 4760 // threads. Calling thr_setprio is meaningless in this case. 4761 // 4762 bool isT2_libthread() { 4763 static prheader_t * lwpArray = NULL; 4764 static int lwpSize = 0; 4765 static int lwpFile = -1; 4766 lwpstatus_t * that; 4767 char lwpName [128]; 4768 bool isT2 = false; 4769 4770 #define ADR(x) ((uintptr_t)(x)) 4771 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4772 4773 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0); 4774 if (lwpFile < 0) { 4775 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4776 return false; 4777 } 4778 lwpSize = 16*1024; 4779 for (;;) { 4780 ::lseek64 (lwpFile, 0, SEEK_SET); 4781 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal); 4782 if (::read(lwpFile, lwpArray, lwpSize) < 0) { 4783 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4784 break; 4785 } 4786 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4787 // We got a good snapshot - now iterate over the list. 4788 int aslwpcount = 0; 4789 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4790 that = LWPINDEX(lwpArray,i); 4791 if (that->pr_flags & PR_ASLWP) { 4792 aslwpcount++; 4793 } 4794 } 4795 if (aslwpcount == 0) isT2 = true; 4796 break; 4797 } 4798 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4799 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry. 4800 } 4801 4802 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); 4803 ::close (lwpFile); 4804 if (ThreadPriorityVerbose) { 4805 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4806 else tty->print_cr("We are not running with a T2 libthread\n"); 4807 } 4808 return isT2; 4809 } 4810 4811 4812 void os::Solaris::libthread_init() { 4813 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4814 4815 // Determine if we are running with the new T2 libthread 4816 os::Solaris::set_T2_libthread(isT2_libthread()); 4817 4818 lwp_priocntl_init(); 4819 4820 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4821 if(func == NULL) { 4822 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4823 // Guarantee that this VM is running on an new enough OS (5.6 or 4824 // later) that it will have a new enough libthread.so. 4825 guarantee(func != NULL, "libthread.so is too old."); 4826 } 4827 4828 // Initialize the new libthread getstate API wrappers 4829 func = resolve_symbol("thr_getstate"); 4830 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4831 4832 func = resolve_symbol("thr_setstate"); 4833 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4834 4835 func = resolve_symbol("thr_setmutator"); 4836 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4837 4838 func = resolve_symbol("thr_suspend_mutator"); 4839 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4840 4841 func = resolve_symbol("thr_continue_mutator"); 4842 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4843 4844 int size; 4845 void (*handler_info_func)(address *, int *); 4846 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4847 handler_info_func(&handler_start, &size); 4848 handler_end = handler_start + size; 4849 } 4850 4851 4852 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4853 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4854 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4855 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4856 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4857 int os::Solaris::_mutex_scope = USYNC_THREAD; 4858 4859 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4860 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4861 int_fnP_cond_tP os::Solaris::_cond_signal; 4862 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4863 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4864 int_fnP_cond_tP os::Solaris::_cond_destroy; 4865 int os::Solaris::_cond_scope = USYNC_THREAD; 4866 4867 void os::Solaris::synchronization_init() { 4868 if(UseLWPSynchronization) { 4869 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4870 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4871 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4872 os::Solaris::set_mutex_init(lwp_mutex_init); 4873 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4874 os::Solaris::set_mutex_scope(USYNC_THREAD); 4875 4876 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4877 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4878 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4879 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4880 os::Solaris::set_cond_init(lwp_cond_init); 4881 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4882 os::Solaris::set_cond_scope(USYNC_THREAD); 4883 } 4884 else { 4885 os::Solaris::set_mutex_scope(USYNC_THREAD); 4886 os::Solaris::set_cond_scope(USYNC_THREAD); 4887 4888 if(UsePthreads) { 4889 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4890 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4891 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4892 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4893 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4894 4895 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4896 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4897 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4898 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4899 os::Solaris::set_cond_init(pthread_cond_default_init); 4900 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4901 } 4902 else { 4903 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4904 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4905 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4906 os::Solaris::set_mutex_init(::mutex_init); 4907 os::Solaris::set_mutex_destroy(::mutex_destroy); 4908 4909 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4910 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4911 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4912 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4913 os::Solaris::set_cond_init(::cond_init); 4914 os::Solaris::set_cond_destroy(::cond_destroy); 4915 } 4916 } 4917 } 4918 4919 bool os::Solaris::liblgrp_init() { 4920 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4921 if (handle != NULL) { 4922 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4923 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4924 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4925 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4926 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4927 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4928 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4929 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4930 dlsym(handle, "lgrp_cookie_stale"))); 4931 4932 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4933 set_lgrp_cookie(c); 4934 return true; 4935 } 4936 return false; 4937 } 4938 4939 void os::Solaris::misc_sym_init() { 4940 address func; 4941 4942 // getisax 4943 func = resolve_symbol_lazy("getisax"); 4944 if (func != NULL) { 4945 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4946 } 4947 4948 // meminfo 4949 func = resolve_symbol_lazy("meminfo"); 4950 if (func != NULL) { 4951 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4952 } 4953 } 4954 4955 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4956 assert(_getisax != NULL, "_getisax not set"); 4957 return _getisax(array, n); 4958 } 4959 4960 // Symbol doesn't exist in Solaris 8 pset.h 4961 #ifndef PS_MYID 4962 #define PS_MYID -3 4963 #endif 4964 4965 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4966 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4967 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4968 4969 void init_pset_getloadavg_ptr(void) { 4970 pset_getloadavg_ptr = 4971 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4972 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4973 warning("pset_getloadavg function not found"); 4974 } 4975 } 4976 4977 int os::Solaris::_dev_zero_fd = -1; 4978 4979 // this is called _before_ the global arguments have been parsed 4980 void os::init(void) { 4981 _initial_pid = getpid(); 4982 4983 max_hrtime = first_hrtime = gethrtime(); 4984 4985 init_random(1234567); 4986 4987 page_size = sysconf(_SC_PAGESIZE); 4988 if (page_size == -1) 4989 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 4990 strerror(errno))); 4991 init_page_sizes((size_t) page_size); 4992 4993 Solaris::initialize_system_info(); 4994 4995 // Initialize misc. symbols as soon as possible, so we can use them 4996 // if we need them. 4997 Solaris::misc_sym_init(); 4998 4999 int fd = ::open("/dev/zero", O_RDWR); 5000 if (fd < 0) { 5001 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 5002 } else { 5003 Solaris::set_dev_zero_fd(fd); 5004 5005 // Close on exec, child won't inherit. 5006 fcntl(fd, F_SETFD, FD_CLOEXEC); 5007 } 5008 5009 clock_tics_per_sec = CLK_TCK; 5010 5011 // check if dladdr1() exists; dladdr1 can provide more information than 5012 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 5013 // and is available on linker patches for 5.7 and 5.8. 5014 // libdl.so must have been loaded, this call is just an entry lookup 5015 void * hdl = dlopen("libdl.so", RTLD_NOW); 5016 if (hdl) 5017 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 5018 5019 // (Solaris only) this switches to calls that actually do locking. 5020 ThreadCritical::initialize(); 5021 5022 main_thread = thr_self(); 5023 5024 // Constant minimum stack size allowed. It must be at least 5025 // the minimum of what the OS supports (thr_min_stack()), and 5026 // enough to allow the thread to get to user bytecode execution. 5027 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 5028 // If the pagesize of the VM is greater than 8K determine the appropriate 5029 // number of initial guard pages. The user can change this with the 5030 // command line arguments, if needed. 5031 if (vm_page_size() > 8*K) { 5032 StackYellowPages = 1; 5033 StackRedPages = 1; 5034 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 5035 } 5036 } 5037 5038 // To install functions for atexit system call 5039 extern "C" { 5040 static void perfMemory_exit_helper() { 5041 perfMemory_exit(); 5042 } 5043 } 5044 5045 // this is called _after_ the global arguments have been parsed 5046 jint os::init_2(void) { 5047 // try to enable extended file IO ASAP, see 6431278 5048 os::Solaris::try_enable_extended_io(); 5049 5050 // Allocate a single page and mark it as readable for safepoint polling. Also 5051 // use this first mmap call to check support for MAP_ALIGN. 5052 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 5053 page_size, 5054 MAP_PRIVATE | MAP_ALIGN, 5055 PROT_READ); 5056 if (polling_page == NULL) { 5057 has_map_align = false; 5058 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 5059 PROT_READ); 5060 } 5061 5062 os::set_polling_page(polling_page); 5063 5064 #ifndef PRODUCT 5065 if( Verbose && PrintMiscellaneous ) 5066 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 5067 #endif 5068 5069 if (!UseMembar) { 5070 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 5071 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 5072 os::set_memory_serialize_page( mem_serialize_page ); 5073 5074 #ifndef PRODUCT 5075 if(Verbose && PrintMiscellaneous) 5076 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 5077 #endif 5078 } 5079 5080 os::large_page_init(); 5081 5082 // Check minimum allowable stack size for thread creation and to initialize 5083 // the java system classes, including StackOverflowError - depends on page 5084 // size. Add a page for compiler2 recursion in main thread. 5085 // Add in 2*BytesPerWord times page size to account for VM stack during 5086 // class initialization depending on 32 or 64 bit VM. 5087 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 5088 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 5089 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 5090 5091 size_t threadStackSizeInBytes = ThreadStackSize * K; 5092 if (threadStackSizeInBytes != 0 && 5093 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 5094 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 5095 os::Solaris::min_stack_allowed/K); 5096 return JNI_ERR; 5097 } 5098 5099 // For 64kbps there will be a 64kb page size, which makes 5100 // the usable default stack size quite a bit less. Increase the 5101 // stack for 64kb (or any > than 8kb) pages, this increases 5102 // virtual memory fragmentation (since we're not creating the 5103 // stack on a power of 2 boundary. The real fix for this 5104 // should be to fix the guard page mechanism. 5105 5106 if (vm_page_size() > 8*K) { 5107 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 5108 ? threadStackSizeInBytes + 5109 ((StackYellowPages + StackRedPages) * vm_page_size()) 5110 : 0; 5111 ThreadStackSize = threadStackSizeInBytes/K; 5112 } 5113 5114 // Make the stack size a multiple of the page size so that 5115 // the yellow/red zones can be guarded. 5116 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 5117 vm_page_size())); 5118 5119 Solaris::libthread_init(); 5120 5121 if (UseNUMA) { 5122 if (!Solaris::liblgrp_init()) { 5123 UseNUMA = false; 5124 } else { 5125 size_t lgrp_limit = os::numa_get_groups_num(); 5126 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 5127 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 5128 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal); 5129 if (lgrp_num < 2) { 5130 // There's only one locality group, disable NUMA. 5131 UseNUMA = false; 5132 } 5133 } 5134 // ISM is not compatible with the NUMA allocator - it always allocates 5135 // pages round-robin across the lgroups. 5136 if (UseNUMA && UseLargePages && UseISM) { 5137 if (!FLAG_IS_DEFAULT(UseNUMA)) { 5138 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseISM)) { 5139 UseLargePages = false; 5140 } else { 5141 warning("UseNUMA is not compatible with ISM large pages, disabling NUMA allocator"); 5142 UseNUMA = false; 5143 } 5144 } else { 5145 UseNUMA = false; 5146 } 5147 } 5148 if (!UseNUMA && ForceNUMA) { 5149 UseNUMA = true; 5150 } 5151 } 5152 5153 Solaris::signal_sets_init(); 5154 Solaris::init_signal_mem(); 5155 Solaris::install_signal_handlers(); 5156 5157 if (libjsigversion < JSIG_VERSION_1_4_1) { 5158 Maxlibjsigsigs = OLDMAXSIGNUM; 5159 } 5160 5161 // initialize synchronization primitives to use either thread or 5162 // lwp synchronization (controlled by UseLWPSynchronization) 5163 Solaris::synchronization_init(); 5164 5165 if (MaxFDLimit) { 5166 // set the number of file descriptors to max. print out error 5167 // if getrlimit/setrlimit fails but continue regardless. 5168 struct rlimit nbr_files; 5169 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 5170 if (status != 0) { 5171 if (PrintMiscellaneous && (Verbose || WizardMode)) 5172 perror("os::init_2 getrlimit failed"); 5173 } else { 5174 nbr_files.rlim_cur = nbr_files.rlim_max; 5175 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 5176 if (status != 0) { 5177 if (PrintMiscellaneous && (Verbose || WizardMode)) 5178 perror("os::init_2 setrlimit failed"); 5179 } 5180 } 5181 } 5182 5183 // Calculate theoretical max. size of Threads to guard gainst 5184 // artifical out-of-memory situations, where all available address- 5185 // space has been reserved by thread stacks. Default stack size is 1Mb. 5186 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 5187 JavaThread::stack_size_at_create() : (1*K*K); 5188 assert(pre_thread_stack_size != 0, "Must have a stack"); 5189 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 5190 // we should start doing Virtual Memory banging. Currently when the threads will 5191 // have used all but 200Mb of space. 5192 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 5193 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 5194 5195 // at-exit methods are called in the reverse order of their registration. 5196 // In Solaris 7 and earlier, atexit functions are called on return from 5197 // main or as a result of a call to exit(3C). There can be only 32 of 5198 // these functions registered and atexit() does not set errno. In Solaris 5199 // 8 and later, there is no limit to the number of functions registered 5200 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 5201 // functions are called upon dlclose(3DL) in addition to return from main 5202 // and exit(3C). 5203 5204 if (PerfAllowAtExitRegistration) { 5205 // only register atexit functions if PerfAllowAtExitRegistration is set. 5206 // atexit functions can be delayed until process exit time, which 5207 // can be problematic for embedded VM situations. Embedded VMs should 5208 // call DestroyJavaVM() to assure that VM resources are released. 5209 5210 // note: perfMemory_exit_helper atexit function may be removed in 5211 // the future if the appropriate cleanup code can be added to the 5212 // VM_Exit VMOperation's doit method. 5213 if (atexit(perfMemory_exit_helper) != 0) { 5214 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5215 } 5216 } 5217 5218 // Init pset_loadavg function pointer 5219 init_pset_getloadavg_ptr(); 5220 5221 return JNI_OK; 5222 } 5223 5224 void os::init_3(void) { 5225 return; 5226 } 5227 5228 // Mark the polling page as unreadable 5229 void os::make_polling_page_unreadable(void) { 5230 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5231 fatal("Could not disable polling page"); 5232 }; 5233 5234 // Mark the polling page as readable 5235 void os::make_polling_page_readable(void) { 5236 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5237 fatal("Could not enable polling page"); 5238 }; 5239 5240 // OS interface. 5241 5242 bool os::check_heap(bool force) { return true; } 5243 5244 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5245 static vsnprintf_t sol_vsnprintf = NULL; 5246 5247 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5248 if (!sol_vsnprintf) { 5249 //search for the named symbol in the objects that were loaded after libjvm 5250 void* where = RTLD_NEXT; 5251 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5252 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5253 if (!sol_vsnprintf){ 5254 //search for the named symbol in the objects that were loaded before libjvm 5255 where = RTLD_DEFAULT; 5256 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5257 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5258 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5259 } 5260 } 5261 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5262 } 5263 5264 5265 // Is a (classpath) directory empty? 5266 bool os::dir_is_empty(const char* path) { 5267 DIR *dir = NULL; 5268 struct dirent *ptr; 5269 5270 dir = opendir(path); 5271 if (dir == NULL) return true; 5272 5273 /* Scan the directory */ 5274 bool result = true; 5275 char buf[sizeof(struct dirent) + MAX_PATH]; 5276 struct dirent *dbuf = (struct dirent *) buf; 5277 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5278 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5279 result = false; 5280 } 5281 } 5282 closedir(dir); 5283 return result; 5284 } 5285 5286 // This code originates from JDK's sysOpen and open64_w 5287 // from src/solaris/hpi/src/system_md.c 5288 5289 #ifndef O_DELETE 5290 #define O_DELETE 0x10000 5291 #endif 5292 5293 // Open a file. Unlink the file immediately after open returns 5294 // if the specified oflag has the O_DELETE flag set. 5295 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 5296 5297 int os::open(const char *path, int oflag, int mode) { 5298 if (strlen(path) > MAX_PATH - 1) { 5299 errno = ENAMETOOLONG; 5300 return -1; 5301 } 5302 int fd; 5303 int o_delete = (oflag & O_DELETE); 5304 oflag = oflag & ~O_DELETE; 5305 5306 fd = ::open64(path, oflag, mode); 5307 if (fd == -1) return -1; 5308 5309 //If the open succeeded, the file might still be a directory 5310 { 5311 struct stat64 buf64; 5312 int ret = ::fstat64(fd, &buf64); 5313 int st_mode = buf64.st_mode; 5314 5315 if (ret != -1) { 5316 if ((st_mode & S_IFMT) == S_IFDIR) { 5317 errno = EISDIR; 5318 ::close(fd); 5319 return -1; 5320 } 5321 } else { 5322 ::close(fd); 5323 return -1; 5324 } 5325 } 5326 /* 5327 * 32-bit Solaris systems suffer from: 5328 * 5329 * - an historical default soft limit of 256 per-process file 5330 * descriptors that is too low for many Java programs. 5331 * 5332 * - a design flaw where file descriptors created using stdio 5333 * fopen must be less than 256, _even_ when the first limit above 5334 * has been raised. This can cause calls to fopen (but not calls to 5335 * open, for example) to fail mysteriously, perhaps in 3rd party 5336 * native code (although the JDK itself uses fopen). One can hardly 5337 * criticize them for using this most standard of all functions. 5338 * 5339 * We attempt to make everything work anyways by: 5340 * 5341 * - raising the soft limit on per-process file descriptors beyond 5342 * 256 5343 * 5344 * - As of Solaris 10u4, we can request that Solaris raise the 256 5345 * stdio fopen limit by calling function enable_extended_FILE_stdio. 5346 * This is done in init_2 and recorded in enabled_extended_FILE_stdio 5347 * 5348 * - If we are stuck on an old (pre 10u4) Solaris system, we can 5349 * workaround the bug by remapping non-stdio file descriptors below 5350 * 256 to ones beyond 256, which is done below. 5351 * 5352 * See: 5353 * 1085341: 32-bit stdio routines should support file descriptors >255 5354 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files 5355 * 6431278: Netbeans crash on 32 bit Solaris: need to call 5356 * enable_extended_FILE_stdio() in VM initialisation 5357 * Giri Mandalika's blog 5358 * http://technopark02.blogspot.com/2005_05_01_archive.html 5359 */ 5360 #ifndef _LP64 5361 if ((!enabled_extended_FILE_stdio) && fd < 256) { 5362 int newfd = ::fcntl(fd, F_DUPFD, 256); 5363 if (newfd != -1) { 5364 ::close(fd); 5365 fd = newfd; 5366 } 5367 } 5368 #endif // 32-bit Solaris 5369 /* 5370 * All file descriptors that are opened in the JVM and not 5371 * specifically destined for a subprocess should have the 5372 * close-on-exec flag set. If we don't set it, then careless 3rd 5373 * party native code might fork and exec without closing all 5374 * appropriate file descriptors (e.g. as we do in closeDescriptors in 5375 * UNIXProcess.c), and this in turn might: 5376 * 5377 * - cause end-of-file to fail to be detected on some file 5378 * descriptors, resulting in mysterious hangs, or 5379 * 5380 * - might cause an fopen in the subprocess to fail on a system 5381 * suffering from bug 1085341. 5382 * 5383 * (Yes, the default setting of the close-on-exec flag is a Unix 5384 * design flaw) 5385 * 5386 * See: 5387 * 1085341: 32-bit stdio routines should support file descriptors >255 5388 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 5389 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 5390 */ 5391 #ifdef FD_CLOEXEC 5392 { 5393 int flags = ::fcntl(fd, F_GETFD); 5394 if (flags != -1) 5395 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 5396 } 5397 #endif 5398 5399 if (o_delete != 0) { 5400 ::unlink(path); 5401 } 5402 return fd; 5403 } 5404 5405 // create binary file, rewriting existing file if required 5406 int os::create_binary_file(const char* path, bool rewrite_existing) { 5407 int oflags = O_WRONLY | O_CREAT; 5408 if (!rewrite_existing) { 5409 oflags |= O_EXCL; 5410 } 5411 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5412 } 5413 5414 // return current position of file pointer 5415 jlong os::current_file_offset(int fd) { 5416 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5417 } 5418 5419 // move file pointer to the specified offset 5420 jlong os::seek_to_file_offset(int fd, jlong offset) { 5421 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5422 } 5423 5424 jlong os::lseek(int fd, jlong offset, int whence) { 5425 return (jlong) ::lseek64(fd, offset, whence); 5426 } 5427 5428 char * os::native_path(char *path) { 5429 return path; 5430 } 5431 5432 int os::ftruncate(int fd, jlong length) { 5433 return ::ftruncate64(fd, length); 5434 } 5435 5436 int os::fsync(int fd) { 5437 RESTARTABLE_RETURN_INT(::fsync(fd)); 5438 } 5439 5440 int os::available(int fd, jlong *bytes) { 5441 jlong cur, end; 5442 int mode; 5443 struct stat64 buf64; 5444 5445 if (::fstat64(fd, &buf64) >= 0) { 5446 mode = buf64.st_mode; 5447 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5448 /* 5449 * XXX: is the following call interruptible? If so, this might 5450 * need to go through the INTERRUPT_IO() wrapper as for other 5451 * blocking, interruptible calls in this file. 5452 */ 5453 int n,ioctl_return; 5454 5455 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted); 5456 if (ioctl_return>= 0) { 5457 *bytes = n; 5458 return 1; 5459 } 5460 } 5461 } 5462 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 5463 return 0; 5464 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 5465 return 0; 5466 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 5467 return 0; 5468 } 5469 *bytes = end - cur; 5470 return 1; 5471 } 5472 5473 // Map a block of memory. 5474 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 5475 char *addr, size_t bytes, bool read_only, 5476 bool allow_exec) { 5477 int prot; 5478 int flags; 5479 5480 if (read_only) { 5481 prot = PROT_READ; 5482 flags = MAP_SHARED; 5483 } else { 5484 prot = PROT_READ | PROT_WRITE; 5485 flags = MAP_PRIVATE; 5486 } 5487 5488 if (allow_exec) { 5489 prot |= PROT_EXEC; 5490 } 5491 5492 if (addr != NULL) { 5493 flags |= MAP_FIXED; 5494 } 5495 5496 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5497 fd, file_offset); 5498 if (mapped_address == MAP_FAILED) { 5499 return NULL; 5500 } 5501 return mapped_address; 5502 } 5503 5504 5505 // Remap a block of memory. 5506 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5507 char *addr, size_t bytes, bool read_only, 5508 bool allow_exec) { 5509 // same as map_memory() on this OS 5510 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5511 allow_exec); 5512 } 5513 5514 5515 // Unmap a block of memory. 5516 bool os::pd_unmap_memory(char* addr, size_t bytes) { 5517 return munmap(addr, bytes) == 0; 5518 } 5519 5520 void os::pause() { 5521 char filename[MAX_PATH]; 5522 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5523 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5524 } else { 5525 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5526 } 5527 5528 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5529 if (fd != -1) { 5530 struct stat buf; 5531 ::close(fd); 5532 while (::stat(filename, &buf) == 0) { 5533 (void)::poll(NULL, 0, 100); 5534 } 5535 } else { 5536 jio_fprintf(stderr, 5537 "Could not open pause file '%s', continuing immediately.\n", filename); 5538 } 5539 } 5540 5541 #ifndef PRODUCT 5542 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5543 // Turn this on if you need to trace synch operations. 5544 // Set RECORD_SYNCH_LIMIT to a large-enough value, 5545 // and call record_synch_enable and record_synch_disable 5546 // around the computation of interest. 5547 5548 void record_synch(char* name, bool returning); // defined below 5549 5550 class RecordSynch { 5551 char* _name; 5552 public: 5553 RecordSynch(char* name) :_name(name) 5554 { record_synch(_name, false); } 5555 ~RecordSynch() { record_synch(_name, true); } 5556 }; 5557 5558 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5559 extern "C" ret name params { \ 5560 typedef ret name##_t params; \ 5561 static name##_t* implem = NULL; \ 5562 static int callcount = 0; \ 5563 if (implem == NULL) { \ 5564 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5565 if (implem == NULL) fatal(dlerror()); \ 5566 } \ 5567 ++callcount; \ 5568 RecordSynch _rs(#name); \ 5569 inner; \ 5570 return implem args; \ 5571 } 5572 // in dbx, examine callcounts this way: 5573 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5574 5575 #define CHECK_POINTER_OK(p) \ 5576 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 5577 #define CHECK_MU \ 5578 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5579 #define CHECK_CV \ 5580 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5581 #define CHECK_P(p) \ 5582 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5583 5584 #define CHECK_MUTEX(mutex_op) \ 5585 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5586 5587 CHECK_MUTEX( mutex_lock) 5588 CHECK_MUTEX( _mutex_lock) 5589 CHECK_MUTEX( mutex_unlock) 5590 CHECK_MUTEX(_mutex_unlock) 5591 CHECK_MUTEX( mutex_trylock) 5592 CHECK_MUTEX(_mutex_trylock) 5593 5594 #define CHECK_COND(cond_op) \ 5595 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5596 5597 CHECK_COND( cond_wait); 5598 CHECK_COND(_cond_wait); 5599 CHECK_COND(_cond_wait_cancel); 5600 5601 #define CHECK_COND2(cond_op) \ 5602 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5603 5604 CHECK_COND2( cond_timedwait); 5605 CHECK_COND2(_cond_timedwait); 5606 CHECK_COND2(_cond_timedwait_cancel); 5607 5608 // do the _lwp_* versions too 5609 #define mutex_t lwp_mutex_t 5610 #define cond_t lwp_cond_t 5611 CHECK_MUTEX( _lwp_mutex_lock) 5612 CHECK_MUTEX( _lwp_mutex_unlock) 5613 CHECK_MUTEX( _lwp_mutex_trylock) 5614 CHECK_MUTEX( __lwp_mutex_lock) 5615 CHECK_MUTEX( __lwp_mutex_unlock) 5616 CHECK_MUTEX( __lwp_mutex_trylock) 5617 CHECK_MUTEX(___lwp_mutex_lock) 5618 CHECK_MUTEX(___lwp_mutex_unlock) 5619 5620 CHECK_COND( _lwp_cond_wait); 5621 CHECK_COND( __lwp_cond_wait); 5622 CHECK_COND(___lwp_cond_wait); 5623 5624 CHECK_COND2( _lwp_cond_timedwait); 5625 CHECK_COND2( __lwp_cond_timedwait); 5626 #undef mutex_t 5627 #undef cond_t 5628 5629 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5630 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5631 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5632 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5633 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5634 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5635 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5636 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5637 5638 5639 // recording machinery: 5640 5641 enum { RECORD_SYNCH_LIMIT = 200 }; 5642 char* record_synch_name[RECORD_SYNCH_LIMIT]; 5643 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5644 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5645 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5646 int record_synch_count = 0; 5647 bool record_synch_enabled = false; 5648 5649 // in dbx, examine recorded data this way: 5650 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5651 5652 void record_synch(char* name, bool returning) { 5653 if (record_synch_enabled) { 5654 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5655 record_synch_name[record_synch_count] = name; 5656 record_synch_returning[record_synch_count] = returning; 5657 record_synch_thread[record_synch_count] = thr_self(); 5658 record_synch_arg0ptr[record_synch_count] = &name; 5659 record_synch_count++; 5660 } 5661 // put more checking code here: 5662 // ... 5663 } 5664 } 5665 5666 void record_synch_enable() { 5667 // start collecting trace data, if not already doing so 5668 if (!record_synch_enabled) record_synch_count = 0; 5669 record_synch_enabled = true; 5670 } 5671 5672 void record_synch_disable() { 5673 // stop collecting trace data 5674 record_synch_enabled = false; 5675 } 5676 5677 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5678 #endif // PRODUCT 5679 5680 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5681 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5682 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5683 5684 5685 // JVMTI & JVM monitoring and management support 5686 // The thread_cpu_time() and current_thread_cpu_time() are only 5687 // supported if is_thread_cpu_time_supported() returns true. 5688 // They are not supported on Solaris T1. 5689 5690 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5691 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5692 // of a thread. 5693 // 5694 // current_thread_cpu_time() and thread_cpu_time(Thread *) 5695 // returns the fast estimate available on the platform. 5696 5697 // hrtime_t gethrvtime() return value includes 5698 // user time but does not include system time 5699 jlong os::current_thread_cpu_time() { 5700 return (jlong) gethrvtime(); 5701 } 5702 5703 jlong os::thread_cpu_time(Thread *thread) { 5704 // return user level CPU time only to be consistent with 5705 // what current_thread_cpu_time returns. 5706 // thread_cpu_time_info() must be changed if this changes 5707 return os::thread_cpu_time(thread, false /* user time only */); 5708 } 5709 5710 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5711 if (user_sys_cpu_time) { 5712 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5713 } else { 5714 return os::current_thread_cpu_time(); 5715 } 5716 } 5717 5718 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5719 char proc_name[64]; 5720 int count; 5721 prusage_t prusage; 5722 jlong lwp_time; 5723 int fd; 5724 5725 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5726 getpid(), 5727 thread->osthread()->lwp_id()); 5728 fd = ::open(proc_name, O_RDONLY); 5729 if ( fd == -1 ) return -1; 5730 5731 do { 5732 count = ::pread(fd, 5733 (void *)&prusage.pr_utime, 5734 thr_time_size, 5735 thr_time_off); 5736 } while (count < 0 && errno == EINTR); 5737 ::close(fd); 5738 if ( count < 0 ) return -1; 5739 5740 if (user_sys_cpu_time) { 5741 // user + system CPU time 5742 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5743 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5744 (jlong)prusage.pr_stime.tv_nsec + 5745 (jlong)prusage.pr_utime.tv_nsec; 5746 } else { 5747 // user level CPU time only 5748 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5749 (jlong)prusage.pr_utime.tv_nsec; 5750 } 5751 5752 return(lwp_time); 5753 } 5754 5755 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5756 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5757 info_ptr->may_skip_backward = false; // elapsed time not wall time 5758 info_ptr->may_skip_forward = false; // elapsed time not wall time 5759 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5760 } 5761 5762 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5763 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5764 info_ptr->may_skip_backward = false; // elapsed time not wall time 5765 info_ptr->may_skip_forward = false; // elapsed time not wall time 5766 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5767 } 5768 5769 bool os::is_thread_cpu_time_supported() { 5770 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5771 return true; 5772 } else { 5773 return false; 5774 } 5775 } 5776 5777 // System loadavg support. Returns -1 if load average cannot be obtained. 5778 // Return the load average for our processor set if the primitive exists 5779 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5780 int os::loadavg(double loadavg[], int nelem) { 5781 if (pset_getloadavg_ptr != NULL) { 5782 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5783 } else { 5784 return ::getloadavg(loadavg, nelem); 5785 } 5786 } 5787 5788 //--------------------------------------------------------------------------------- 5789 5790 bool os::find(address addr, outputStream* st) { 5791 Dl_info dlinfo; 5792 memset(&dlinfo, 0, sizeof(dlinfo)); 5793 if (dladdr(addr, &dlinfo)) { 5794 #ifdef _LP64 5795 st->print("0x%016lx: ", addr); 5796 #else 5797 st->print("0x%08x: ", addr); 5798 #endif 5799 if (dlinfo.dli_sname != NULL) 5800 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5801 else if (dlinfo.dli_fname) 5802 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5803 else 5804 st->print("<absolute address>"); 5805 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname); 5806 #ifdef _LP64 5807 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase); 5808 #else 5809 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase); 5810 #endif 5811 st->cr(); 5812 5813 if (Verbose) { 5814 // decode some bytes around the PC 5815 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5816 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5817 address lowest = (address) dlinfo.dli_sname; 5818 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5819 if (begin < lowest) begin = lowest; 5820 Dl_info dlinfo2; 5821 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 5822 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5823 end = (address) dlinfo2.dli_saddr; 5824 Disassembler::decode(begin, end, st); 5825 } 5826 return true; 5827 } 5828 return false; 5829 } 5830 5831 // Following function has been added to support HotSparc's libjvm.so running 5832 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5833 // src/solaris/hpi/native_threads in the EVM codebase. 5834 // 5835 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5836 // libraries and should thus be removed. We will leave it behind for a while 5837 // until we no longer want to able to run on top of 1.3.0 Solaris production 5838 // JDK. See 4341971. 5839 5840 #define STACK_SLACK 0x800 5841 5842 extern "C" { 5843 intptr_t sysThreadAvailableStackWithSlack() { 5844 stack_t st; 5845 intptr_t retval, stack_top; 5846 retval = thr_stksegment(&st); 5847 assert(retval == 0, "incorrect return value from thr_stksegment"); 5848 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5849 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5850 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5851 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5852 } 5853 } 5854 5855 // ObjectMonitor park-unpark infrastructure ... 5856 // 5857 // We implement Solaris and Linux PlatformEvents with the 5858 // obvious condvar-mutex-flag triple. 5859 // Another alternative that works quite well is pipes: 5860 // Each PlatformEvent consists of a pipe-pair. 5861 // The thread associated with the PlatformEvent 5862 // calls park(), which reads from the input end of the pipe. 5863 // Unpark() writes into the other end of the pipe. 5864 // The write-side of the pipe must be set NDELAY. 5865 // Unfortunately pipes consume a large # of handles. 5866 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5867 // Using pipes for the 1st few threads might be workable, however. 5868 // 5869 // park() is permitted to return spuriously. 5870 // Callers of park() should wrap the call to park() in 5871 // an appropriate loop. A litmus test for the correct 5872 // usage of park is the following: if park() were modified 5873 // to immediately return 0 your code should still work, 5874 // albeit degenerating to a spin loop. 5875 // 5876 // An interesting optimization for park() is to use a trylock() 5877 // to attempt to acquire the mutex. If the trylock() fails 5878 // then we know that a concurrent unpark() operation is in-progress. 5879 // in that case the park() code could simply set _count to 0 5880 // and return immediately. The subsequent park() operation *might* 5881 // return immediately. That's harmless as the caller of park() is 5882 // expected to loop. By using trylock() we will have avoided a 5883 // avoided a context switch caused by contention on the per-thread mutex. 5884 // 5885 // TODO-FIXME: 5886 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5887 // objectmonitor implementation. 5888 // 2. Collapse the JSR166 parker event, and the 5889 // objectmonitor ParkEvent into a single "Event" construct. 5890 // 3. In park() and unpark() add: 5891 // assert (Thread::current() == AssociatedWith). 5892 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5893 // 1-out-of-N park() operations will return immediately. 5894 // 5895 // _Event transitions in park() 5896 // -1 => -1 : illegal 5897 // 1 => 0 : pass - return immediately 5898 // 0 => -1 : block 5899 // 5900 // _Event serves as a restricted-range semaphore. 5901 // 5902 // Another possible encoding of _Event would be with 5903 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5904 // 5905 // TODO-FIXME: add DTRACE probes for: 5906 // 1. Tx parks 5907 // 2. Ty unparks Tx 5908 // 3. Tx resumes from park 5909 5910 5911 // value determined through experimentation 5912 #define ROUNDINGFIX 11 5913 5914 // utility to compute the abstime argument to timedwait. 5915 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5916 5917 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5918 // millis is the relative timeout time 5919 // abstime will be the absolute timeout time 5920 if (millis < 0) millis = 0; 5921 struct timeval now; 5922 int status = gettimeofday(&now, NULL); 5923 assert(status == 0, "gettimeofday"); 5924 jlong seconds = millis / 1000; 5925 jlong max_wait_period; 5926 5927 if (UseLWPSynchronization) { 5928 // forward port of fix for 4275818 (not sleeping long enough) 5929 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5930 // _lwp_cond_timedwait() used a round_down algorithm rather 5931 // than a round_up. For millis less than our roundfactor 5932 // it rounded down to 0 which doesn't meet the spec. 5933 // For millis > roundfactor we may return a bit sooner, but 5934 // since we can not accurately identify the patch level and 5935 // this has already been fixed in Solaris 9 and 8 we will 5936 // leave it alone rather than always rounding down. 5937 5938 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5939 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5940 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5941 max_wait_period = 21000000; 5942 } else { 5943 max_wait_period = 50000000; 5944 } 5945 millis %= 1000; 5946 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5947 seconds = max_wait_period; 5948 } 5949 abstime->tv_sec = now.tv_sec + seconds; 5950 long usec = now.tv_usec + millis * 1000; 5951 if (usec >= 1000000) { 5952 abstime->tv_sec += 1; 5953 usec -= 1000000; 5954 } 5955 abstime->tv_nsec = usec * 1000; 5956 return abstime; 5957 } 5958 5959 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5960 // Conceptually TryPark() should be equivalent to park(0). 5961 5962 int os::PlatformEvent::TryPark() { 5963 for (;;) { 5964 const int v = _Event ; 5965 guarantee ((v == 0) || (v == 1), "invariant") ; 5966 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5967 } 5968 } 5969 5970 void os::PlatformEvent::park() { // AKA: down() 5971 // Invariant: Only the thread associated with the Event/PlatformEvent 5972 // may call park(). 5973 int v ; 5974 for (;;) { 5975 v = _Event ; 5976 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5977 } 5978 guarantee (v >= 0, "invariant") ; 5979 if (v == 0) { 5980 // Do this the hard way by blocking ... 5981 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5982 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5983 // Only for SPARC >= V8PlusA 5984 #if defined(__sparc) && defined(COMPILER2) 5985 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5986 #endif 5987 int status = os::Solaris::mutex_lock(_mutex); 5988 assert_status(status == 0, status, "mutex_lock"); 5989 guarantee (_nParked == 0, "invariant") ; 5990 ++ _nParked ; 5991 while (_Event < 0) { 5992 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5993 // Treat this the same as if the wait was interrupted 5994 // With usr/lib/lwp going to kernel, always handle ETIME 5995 status = os::Solaris::cond_wait(_cond, _mutex); 5996 if (status == ETIME) status = EINTR ; 5997 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5998 } 5999 -- _nParked ; 6000 _Event = 0 ; 6001 status = os::Solaris::mutex_unlock(_mutex); 6002 assert_status(status == 0, status, "mutex_unlock"); 6003 // Paranoia to ensure our locked and lock-free paths interact 6004 // correctly with each other. 6005 OrderAccess::fence(); 6006 } 6007 } 6008 6009 int os::PlatformEvent::park(jlong millis) { 6010 guarantee (_nParked == 0, "invariant") ; 6011 int v ; 6012 for (;;) { 6013 v = _Event ; 6014 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6015 } 6016 guarantee (v >= 0, "invariant") ; 6017 if (v != 0) return OS_OK ; 6018 6019 int ret = OS_TIMEOUT; 6020 timestruc_t abst; 6021 compute_abstime (&abst, millis); 6022 6023 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6024 // For Solaris SPARC set fprs.FEF=0 prior to parking. 6025 // Only for SPARC >= V8PlusA 6026 #if defined(__sparc) && defined(COMPILER2) 6027 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6028 #endif 6029 int status = os::Solaris::mutex_lock(_mutex); 6030 assert_status(status == 0, status, "mutex_lock"); 6031 guarantee (_nParked == 0, "invariant") ; 6032 ++ _nParked ; 6033 while (_Event < 0) { 6034 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 6035 assert_status(status == 0 || status == EINTR || 6036 status == ETIME || status == ETIMEDOUT, 6037 status, "cond_timedwait"); 6038 if (!FilterSpuriousWakeups) break ; // previous semantics 6039 if (status == ETIME || status == ETIMEDOUT) break ; 6040 // We consume and ignore EINTR and spurious wakeups. 6041 } 6042 -- _nParked ; 6043 if (_Event >= 0) ret = OS_OK ; 6044 _Event = 0 ; 6045 status = os::Solaris::mutex_unlock(_mutex); 6046 assert_status(status == 0, status, "mutex_unlock"); 6047 // Paranoia to ensure our locked and lock-free paths interact 6048 // correctly with each other. 6049 OrderAccess::fence(); 6050 return ret; 6051 } 6052 6053 void os::PlatformEvent::unpark() { 6054 // Transitions for _Event: 6055 // 0 :=> 1 6056 // 1 :=> 1 6057 // -1 :=> either 0 or 1; must signal target thread 6058 // That is, we can safely transition _Event from -1 to either 6059 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 6060 // unpark() calls. 6061 // See also: "Semaphores in Plan 9" by Mullender & Cox 6062 // 6063 // Note: Forcing a transition from "-1" to "1" on an unpark() means 6064 // that it will take two back-to-back park() calls for the owning 6065 // thread to block. This has the benefit of forcing a spurious return 6066 // from the first park() call after an unpark() call which will help 6067 // shake out uses of park() and unpark() without condition variables. 6068 6069 if (Atomic::xchg(1, &_Event) >= 0) return; 6070 6071 // If the thread associated with the event was parked, wake it. 6072 // Wait for the thread assoc with the PlatformEvent to vacate. 6073 int status = os::Solaris::mutex_lock(_mutex); 6074 assert_status(status == 0, status, "mutex_lock"); 6075 int AnyWaiters = _nParked; 6076 status = os::Solaris::mutex_unlock(_mutex); 6077 assert_status(status == 0, status, "mutex_unlock"); 6078 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 6079 if (AnyWaiters != 0) { 6080 // We intentional signal *after* dropping the lock 6081 // to avoid a common class of futile wakeups. 6082 status = os::Solaris::cond_signal(_cond); 6083 assert_status(status == 0, status, "cond_signal"); 6084 } 6085 } 6086 6087 // JSR166 6088 // ------------------------------------------------------- 6089 6090 /* 6091 * The solaris and linux implementations of park/unpark are fairly 6092 * conservative for now, but can be improved. They currently use a 6093 * mutex/condvar pair, plus _counter. 6094 * Park decrements _counter if > 0, else does a condvar wait. Unpark 6095 * sets count to 1 and signals condvar. Only one thread ever waits 6096 * on the condvar. Contention seen when trying to park implies that someone 6097 * is unparking you, so don't wait. And spurious returns are fine, so there 6098 * is no need to track notifications. 6099 */ 6100 6101 #define MAX_SECS 100000000 6102 /* 6103 * This code is common to linux and solaris and will be moved to a 6104 * common place in dolphin. 6105 * 6106 * The passed in time value is either a relative time in nanoseconds 6107 * or an absolute time in milliseconds. Either way it has to be unpacked 6108 * into suitable seconds and nanoseconds components and stored in the 6109 * given timespec structure. 6110 * Given time is a 64-bit value and the time_t used in the timespec is only 6111 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 6112 * overflow if times way in the future are given. Further on Solaris versions 6113 * prior to 10 there is a restriction (see cond_timedwait) that the specified 6114 * number of seconds, in abstime, is less than current_time + 100,000,000. 6115 * As it will be 28 years before "now + 100000000" will overflow we can 6116 * ignore overflow and just impose a hard-limit on seconds using the value 6117 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 6118 * years from "now". 6119 */ 6120 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 6121 assert (time > 0, "convertTime"); 6122 6123 struct timeval now; 6124 int status = gettimeofday(&now, NULL); 6125 assert(status == 0, "gettimeofday"); 6126 6127 time_t max_secs = now.tv_sec + MAX_SECS; 6128 6129 if (isAbsolute) { 6130 jlong secs = time / 1000; 6131 if (secs > max_secs) { 6132 absTime->tv_sec = max_secs; 6133 } 6134 else { 6135 absTime->tv_sec = secs; 6136 } 6137 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 6138 } 6139 else { 6140 jlong secs = time / NANOSECS_PER_SEC; 6141 if (secs >= MAX_SECS) { 6142 absTime->tv_sec = max_secs; 6143 absTime->tv_nsec = 0; 6144 } 6145 else { 6146 absTime->tv_sec = now.tv_sec + secs; 6147 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 6148 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 6149 absTime->tv_nsec -= NANOSECS_PER_SEC; 6150 ++absTime->tv_sec; // note: this must be <= max_secs 6151 } 6152 } 6153 } 6154 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 6155 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 6156 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 6157 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 6158 } 6159 6160 void Parker::park(bool isAbsolute, jlong time) { 6161 // Ideally we'd do something useful while spinning, such 6162 // as calling unpackTime(). 6163 6164 // Optional fast-path check: 6165 // Return immediately if a permit is available. 6166 // We depend on Atomic::xchg() having full barrier semantics 6167 // since we are doing a lock-free update to _counter. 6168 if (Atomic::xchg(0, &_counter) > 0) return; 6169 6170 // Optional fast-exit: Check interrupt before trying to wait 6171 Thread* thread = Thread::current(); 6172 assert(thread->is_Java_thread(), "Must be JavaThread"); 6173 JavaThread *jt = (JavaThread *)thread; 6174 if (Thread::is_interrupted(thread, false)) { 6175 return; 6176 } 6177 6178 // First, demultiplex/decode time arguments 6179 timespec absTime; 6180 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 6181 return; 6182 } 6183 if (time > 0) { 6184 // Warning: this code might be exposed to the old Solaris time 6185 // round-down bugs. Grep "roundingFix" for details. 6186 unpackTime(&absTime, isAbsolute, time); 6187 } 6188 6189 // Enter safepoint region 6190 // Beware of deadlocks such as 6317397. 6191 // The per-thread Parker:: _mutex is a classic leaf-lock. 6192 // In particular a thread must never block on the Threads_lock while 6193 // holding the Parker:: mutex. If safepoints are pending both the 6194 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 6195 ThreadBlockInVM tbivm(jt); 6196 6197 // Don't wait if cannot get lock since interference arises from 6198 // unblocking. Also. check interrupt before trying wait 6199 if (Thread::is_interrupted(thread, false) || 6200 os::Solaris::mutex_trylock(_mutex) != 0) { 6201 return; 6202 } 6203 6204 int status ; 6205 6206 if (_counter > 0) { // no wait needed 6207 _counter = 0; 6208 status = os::Solaris::mutex_unlock(_mutex); 6209 assert (status == 0, "invariant") ; 6210 // Paranoia to ensure our locked and lock-free paths interact 6211 // correctly with each other and Java-level accesses. 6212 OrderAccess::fence(); 6213 return; 6214 } 6215 6216 #ifdef ASSERT 6217 // Don't catch signals while blocked; let the running threads have the signals. 6218 // (This allows a debugger to break into the running thread.) 6219 sigset_t oldsigs; 6220 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 6221 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 6222 #endif 6223 6224 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 6225 jt->set_suspend_equivalent(); 6226 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 6227 6228 // Do this the hard way by blocking ... 6229 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6230 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6231 // Only for SPARC >= V8PlusA 6232 #if defined(__sparc) && defined(COMPILER2) 6233 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6234 #endif 6235 6236 if (time == 0) { 6237 status = os::Solaris::cond_wait (_cond, _mutex) ; 6238 } else { 6239 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 6240 } 6241 // Note that an untimed cond_wait() can sometimes return ETIME on older 6242 // versions of the Solaris. 6243 assert_status(status == 0 || status == EINTR || 6244 status == ETIME || status == ETIMEDOUT, 6245 status, "cond_timedwait"); 6246 6247 #ifdef ASSERT 6248 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 6249 #endif 6250 _counter = 0 ; 6251 status = os::Solaris::mutex_unlock(_mutex); 6252 assert_status(status == 0, status, "mutex_unlock") ; 6253 // Paranoia to ensure our locked and lock-free paths interact 6254 // correctly with each other and Java-level accesses. 6255 OrderAccess::fence(); 6256 6257 // If externally suspended while waiting, re-suspend 6258 if (jt->handle_special_suspend_equivalent_condition()) { 6259 jt->java_suspend_self(); 6260 } 6261 } 6262 6263 void Parker::unpark() { 6264 int s, status ; 6265 status = os::Solaris::mutex_lock (_mutex) ; 6266 assert (status == 0, "invariant") ; 6267 s = _counter; 6268 _counter = 1; 6269 status = os::Solaris::mutex_unlock (_mutex) ; 6270 assert (status == 0, "invariant") ; 6271 6272 if (s < 1) { 6273 status = os::Solaris::cond_signal (_cond) ; 6274 assert (status == 0, "invariant") ; 6275 } 6276 } 6277 6278 extern char** environ; 6279 6280 // Run the specified command in a separate process. Return its exit value, 6281 // or -1 on failure (e.g. can't fork a new process). 6282 // Unlike system(), this function can be called from signal handler. It 6283 // doesn't block SIGINT et al. 6284 int os::fork_and_exec(char* cmd) { 6285 char * argv[4]; 6286 argv[0] = (char *)"sh"; 6287 argv[1] = (char *)"-c"; 6288 argv[2] = cmd; 6289 argv[3] = NULL; 6290 6291 // fork is async-safe, fork1 is not so can't use in signal handler 6292 pid_t pid; 6293 Thread* t = ThreadLocalStorage::get_thread_slow(); 6294 if (t != NULL && t->is_inside_signal_handler()) { 6295 pid = fork(); 6296 } else { 6297 pid = fork1(); 6298 } 6299 6300 if (pid < 0) { 6301 // fork failed 6302 warning("fork failed: %s", strerror(errno)); 6303 return -1; 6304 6305 } else if (pid == 0) { 6306 // child process 6307 6308 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 6309 execve("/usr/bin/sh", argv, environ); 6310 6311 // execve failed 6312 _exit(-1); 6313 6314 } else { 6315 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 6316 // care about the actual exit code, for now. 6317 6318 int status; 6319 6320 // Wait for the child process to exit. This returns immediately if 6321 // the child has already exited. */ 6322 while (waitpid(pid, &status, 0) < 0) { 6323 switch (errno) { 6324 case ECHILD: return 0; 6325 case EINTR: break; 6326 default: return -1; 6327 } 6328 } 6329 6330 if (WIFEXITED(status)) { 6331 // The child exited normally; get its exit code. 6332 return WEXITSTATUS(status); 6333 } else if (WIFSIGNALED(status)) { 6334 // The child exited because of a signal 6335 // The best value to return is 0x80 + signal number, 6336 // because that is what all Unix shells do, and because 6337 // it allows callers to distinguish between process exit and 6338 // process death by signal. 6339 return 0x80 + WTERMSIG(status); 6340 } else { 6341 // Unknown exit code; pass it through 6342 return status; 6343 } 6344 } 6345 } 6346 6347 // is_headless_jre() 6348 // 6349 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 6350 // in order to report if we are running in a headless jre 6351 // 6352 // Since JDK8 xawt/libmawt.so was moved into the same directory 6353 // as libawt.so, and renamed libawt_xawt.so 6354 // 6355 bool os::is_headless_jre() { 6356 struct stat statbuf; 6357 char buf[MAXPATHLEN]; 6358 char libmawtpath[MAXPATHLEN]; 6359 const char *xawtstr = "/xawt/libmawt.so"; 6360 const char *new_xawtstr = "/libawt_xawt.so"; 6361 char *p; 6362 6363 // Get path to libjvm.so 6364 os::jvm_path(buf, sizeof(buf)); 6365 6366 // Get rid of libjvm.so 6367 p = strrchr(buf, '/'); 6368 if (p == NULL) return false; 6369 else *p = '\0'; 6370 6371 // Get rid of client or server 6372 p = strrchr(buf, '/'); 6373 if (p == NULL) return false; 6374 else *p = '\0'; 6375 6376 // check xawt/libmawt.so 6377 strcpy(libmawtpath, buf); 6378 strcat(libmawtpath, xawtstr); 6379 if (::stat(libmawtpath, &statbuf) == 0) return false; 6380 6381 // check libawt_xawt.so 6382 strcpy(libmawtpath, buf); 6383 strcat(libmawtpath, new_xawtstr); 6384 if (::stat(libmawtpath, &statbuf) == 0) return false; 6385 6386 return true; 6387 } 6388 6389 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 6390 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted); 6391 } 6392 6393 int os::close(int fd) { 6394 RESTARTABLE_RETURN_INT(::close(fd)); 6395 } 6396 6397 int os::socket_close(int fd) { 6398 RESTARTABLE_RETURN_INT(::close(fd)); 6399 } 6400 6401 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 6402 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6403 } 6404 6405 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 6406 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6407 } 6408 6409 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 6410 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6411 } 6412 6413 // As both poll and select can be interrupted by signals, we have to be 6414 // prepared to restart the system call after updating the timeout, unless 6415 // a poll() is done with timeout == -1, in which case we repeat with this 6416 // "wait forever" value. 6417 6418 int os::timeout(int fd, long timeout) { 6419 int res; 6420 struct timeval t; 6421 julong prevtime, newtime; 6422 static const char* aNull = 0; 6423 struct pollfd pfd; 6424 pfd.fd = fd; 6425 pfd.events = POLLIN; 6426 6427 gettimeofday(&t, &aNull); 6428 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000; 6429 6430 for(;;) { 6431 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted); 6432 if(res == OS_ERR && errno == EINTR) { 6433 if(timeout != -1) { 6434 gettimeofday(&t, &aNull); 6435 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000; 6436 timeout -= newtime - prevtime; 6437 if(timeout <= 0) 6438 return OS_OK; 6439 prevtime = newtime; 6440 } 6441 } else return res; 6442 } 6443 } 6444 6445 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 6446 int _result; 6447 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\ 6448 os::Solaris::clear_interrupted); 6449 6450 // Depending on when thread interruption is reset, _result could be 6451 // one of two values when errno == EINTR 6452 6453 if (((_result == OS_INTRPT) || (_result == OS_ERR)) 6454 && (errno == EINTR)) { 6455 /* restarting a connect() changes its errno semantics */ 6456 INTERRUPTIBLE(::connect(fd, him, len), _result,\ 6457 os::Solaris::clear_interrupted); 6458 /* undo these changes */ 6459 if (_result == OS_ERR) { 6460 if (errno == EALREADY) { 6461 errno = EINPROGRESS; /* fall through */ 6462 } else if (errno == EISCONN) { 6463 errno = 0; 6464 return OS_OK; 6465 } 6466 } 6467 } 6468 return _result; 6469 } 6470 6471 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 6472 if (fd < 0) { 6473 return OS_ERR; 6474 } 6475 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\ 6476 os::Solaris::clear_interrupted); 6477 } 6478 6479 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags, 6480 sockaddr* from, socklen_t* fromlen) { 6481 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\ 6482 os::Solaris::clear_interrupted); 6483 } 6484 6485 int os::sendto(int fd, char* buf, size_t len, uint flags, 6486 struct sockaddr* to, socklen_t tolen) { 6487 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\ 6488 os::Solaris::clear_interrupted); 6489 } 6490 6491 int os::socket_available(int fd, jint *pbytes) { 6492 if (fd < 0) { 6493 return OS_OK; 6494 } 6495 int ret; 6496 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 6497 // note: ioctl can return 0 when successful, JVM_SocketAvailable 6498 // is expected to return 0 on failure and 1 on success to the jdk. 6499 return (ret == OS_ERR) ? 0 : 1; 6500 } 6501 6502 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 6503 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\ 6504 os::Solaris::clear_interrupted); 6505 } 6506 6507 // Get the default path to the core file 6508 // Returns the length of the string 6509 int os::get_core_path(char* buffer, size_t bufferSize) { 6510 const char* p = get_current_directory(buffer, bufferSize); 6511 6512 if (p == NULL) { 6513 assert(p != NULL, "failed to get current directory"); 6514 return 0; 6515 } 6516 6517 return strlen(buffer); 6518 }