Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 17979:e204777ac770
8042933: assert(capacity_until_gc >= committed_bytes) failed
Reviewed-by: stefank, jmasa
| author | ehelin |
|---|---|
| date | Fri, 13 Jun 2014 08:44:11 +0200 |
| parents | 78bbf4d43a14 |
| children | a45a4f5a9609 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
| 1972 | 38 #include "memory/oopFactory.hpp" |
| 39 #include "memory/universe.inline.hpp" | |
| 40 #include "oops/instanceKlass.hpp" | |
| 41 #include "oops/objArrayOop.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
| 1972 | 44 #include "prims/jvm_misc.hpp" |
| 45 #include "prims/jvmtiExport.hpp" | |
| 46 #include "prims/jvmtiThreadState.hpp" | |
| 47 #include "prims/privilegedStack.hpp" | |
| 48 #include "runtime/arguments.hpp" | |
| 49 #include "runtime/biasedLocking.hpp" | |
| 50 #include "runtime/deoptimization.hpp" | |
| 51 #include "runtime/fprofiler.hpp" | |
| 52 #include "runtime/frame.inline.hpp" | |
| 53 #include "runtime/init.hpp" | |
| 54 #include "runtime/interfaceSupport.hpp" | |
| 55 #include "runtime/java.hpp" | |
| 56 #include "runtime/javaCalls.hpp" | |
| 57 #include "runtime/jniPeriodicChecker.hpp" | |
| 58 #include "runtime/memprofiler.hpp" | |
| 59 #include "runtime/mutexLocker.hpp" | |
| 60 #include "runtime/objectMonitor.hpp" | |
| 61 #include "runtime/osThread.hpp" | |
| 62 #include "runtime/safepoint.hpp" | |
| 63 #include "runtime/sharedRuntime.hpp" | |
| 64 #include "runtime/statSampler.hpp" | |
| 65 #include "runtime/stubRoutines.hpp" | |
| 66 #include "runtime/task.hpp" | |
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67 #include "runtime/thread.inline.hpp" |
| 1972 | 68 #include "runtime/threadCritical.hpp" |
| 69 #include "runtime/threadLocalStorage.hpp" | |
| 70 #include "runtime/vframe.hpp" | |
| 71 #include "runtime/vframeArray.hpp" | |
| 72 #include "runtime/vframe_hp.hpp" | |
| 73 #include "runtime/vmThread.hpp" | |
| 74 #include "runtime/vm_operations.hpp" | |
| 75 #include "services/attachListener.hpp" | |
| 76 #include "services/management.hpp" | |
| 6197 | 77 #include "services/memTracker.hpp" |
| 1972 | 78 #include "services/threadService.hpp" |
| 10405 | 79 #include "trace/tracing.hpp" |
| 80 #include "trace/traceMacros.hpp" | |
| 1972 | 81 #include "utilities/defaultStream.hpp" |
| 82 #include "utilities/dtrace.hpp" | |
| 83 #include "utilities/events.hpp" | |
| 84 #include "utilities/preserveException.hpp" | |
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85 #include "utilities/macros.hpp" |
| 1972 | 86 #ifdef TARGET_OS_FAMILY_linux |
| 87 # include "os_linux.inline.hpp" | |
| 88 #endif | |
| 89 #ifdef TARGET_OS_FAMILY_solaris | |
| 90 # include "os_solaris.inline.hpp" | |
| 91 #endif | |
| 92 #ifdef TARGET_OS_FAMILY_windows | |
| 93 # include "os_windows.inline.hpp" | |
| 94 #endif | |
| 3960 | 95 #ifdef TARGET_OS_FAMILY_bsd |
| 96 # include "os_bsd.inline.hpp" | |
| 97 #endif | |
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98 #if INCLUDE_ALL_GCS |
| 1972 | 99 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
| 100 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 101 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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102 #endif // INCLUDE_ALL_GCS |
| 1972 | 103 #ifdef COMPILER1 |
| 104 #include "c1/c1_Compiler.hpp" | |
| 105 #endif | |
| 106 #ifdef COMPILER2 | |
| 107 #include "opto/c2compiler.hpp" | |
| 108 #include "opto/idealGraphPrinter.hpp" | |
| 109 #endif | |
| 17780 | 110 #if INCLUDE_RTM_OPT |
| 111 #include "runtime/rtmLocking.hpp" | |
| 112 #endif | |
| 0 | 113 |
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114 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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115 |
| 0 | 116 #ifdef DTRACE_ENABLED |
| 117 | |
| 118 // Only bother with this argument setup if dtrace is available | |
| 119 | |
| 4006 | 120 #ifndef USDT2 |
| 0 | 121 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 122 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 123 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 124 intptr_t, intptr_t, bool); | |
| 125 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 126 intptr_t, intptr_t, bool); | |
| 127 | |
| 128 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 129 { \ | |
| 130 ResourceMark rm(this); \ | |
| 131 int len = 0; \ | |
| 132 const char* name = (javathread)->get_thread_name(); \ | |
| 133 len = strlen(name); \ | |
| 134 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 135 name, len, \ | |
| 136 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 137 (javathread)->osthread()->thread_id(), \ | |
| 138 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 139 } | |
| 140 | |
| 4006 | 141 #else /* USDT2 */ |
| 142 | |
| 143 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 144 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 145 | |
| 146 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 147 { \ | |
| 148 ResourceMark rm(this); \ | |
| 149 int len = 0; \ | |
| 150 const char* name = (javathread)->get_thread_name(); \ | |
| 151 len = strlen(name); \ | |
| 152 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 153 (char *) name, len, \ | |
| 154 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 155 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 156 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 157 } | |
| 158 | |
| 159 #endif /* USDT2 */ | |
| 160 | |
| 0 | 161 #else // ndef DTRACE_ENABLED |
| 162 | |
| 163 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 164 | |
| 165 #endif // ndef DTRACE_ENABLED | |
| 166 | |
| 6197 | 167 |
| 0 | 168 // Class hierarchy |
| 169 // - Thread | |
| 170 // - VMThread | |
| 171 // - WatcherThread | |
| 172 // - ConcurrentMarkSweepThread | |
| 173 // - JavaThread | |
| 174 // - CompilerThread | |
| 175 | |
| 176 // ======= Thread ======== | |
| 177 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 178 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 179 if (UseBiasedLocking) { |
| 180 const int alignment = markOopDesc::biased_lock_alignment; | |
| 181 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 182 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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183 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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184 AllocFailStrategy::RETURN_NULL); |
| 0 | 185 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 186 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 187 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 188 "JavaThread alignment code overflowed allocated storage"); | |
| 189 if (TraceBiasedLocking) { | |
| 190 if (aligned_addr != real_malloc_addr) | |
| 191 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 192 real_malloc_addr, aligned_addr); | |
| 193 } | |
| 194 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 195 return aligned_addr; | |
| 196 } else { | |
| 6197 | 197 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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198 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 199 } |
| 200 } | |
| 201 | |
| 202 void Thread::operator delete(void* p) { | |
| 203 if (UseBiasedLocking) { | |
| 204 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 205 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 206 } else { |
| 6197 | 207 FreeHeap(p, mtThread); |
| 0 | 208 } |
| 209 } | |
| 210 | |
| 211 | |
| 212 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 213 // JavaThread | |
| 214 | |
| 215 | |
| 216 Thread::Thread() { | |
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217 // stack and get_thread |
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218 set_stack_base(NULL); |
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219 set_stack_size(0); |
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220 set_self_raw_id(0); |
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221 set_lgrp_id(-1); |
| 0 | 222 |
| 223 // allocated data structures | |
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224 set_osthread(NULL); |
| 6197 | 225 set_resource_area(new (mtThread)ResourceArea()); |
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226 DEBUG_ONLY(_current_resource_mark = NULL;) |
| 6197 | 227 set_handle_area(new (mtThread) HandleArea(NULL)); |
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228 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
| 0 | 229 set_active_handles(NULL); |
| 230 set_free_handle_block(NULL); | |
| 231 set_last_handle_mark(NULL); | |
| 232 | |
| 233 // This initial value ==> never claimed. | |
| 234 _oops_do_parity = 0; | |
| 235 | |
| 236 // the handle mark links itself to last_handle_mark | |
| 10135 | 237 new HandleMark(this); |
| 238 | |
| 0 | 239 // plain initialization |
| 240 debug_only(_owned_locks = NULL;) | |
| 241 debug_only(_allow_allocation_count = 0;) | |
| 242 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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243 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 244 _jvmti_env_iteration_count = 0; |
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245 set_allocated_bytes(0); |
| 0 | 246 _vm_operation_started_count = 0; |
| 247 _vm_operation_completed_count = 0; | |
| 248 _current_pending_monitor = NULL; | |
| 249 _current_pending_monitor_is_from_java = true; | |
| 250 _current_waiting_monitor = NULL; | |
| 251 _num_nested_signal = 0; | |
| 252 omFreeList = NULL ; | |
| 253 omFreeCount = 0 ; | |
| 254 omFreeProvision = 32 ; | |
| 1587 | 255 omInUseList = NULL ; |
| 256 omInUseCount = 0 ; | |
| 0 | 257 |
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258 #ifdef ASSERT |
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259 _visited_for_critical_count = false; |
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260 #endif |
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261 |
| 0 | 262 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 263 _suspend_flags = 0; | |
| 264 | |
| 265 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 266 _hashStateX = os::random() ; | |
| 267 _hashStateY = 842502087 ; | |
| 268 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 269 _hashStateW = 273326509 ; | |
| 270 | |
| 271 _OnTrap = 0 ; | |
| 272 _schedctl = NULL ; | |
| 273 _Stalled = 0 ; | |
| 274 _TypeTag = 0x2BAD ; | |
| 275 | |
| 276 // Many of the following fields are effectively final - immutable | |
| 277 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 278 // construct until the _MutexEvent is initialized ... | |
| 279 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 280 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 281 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 282 // and ::Release() | |
| 283 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 284 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 285 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 286 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 287 | |
| 288 #ifdef CHECK_UNHANDLED_OOPS | |
| 289 if (CheckUnhandledOops) { | |
| 290 _unhandled_oops = new UnhandledOops(this); | |
| 291 } | |
| 292 #endif // CHECK_UNHANDLED_OOPS | |
| 293 #ifdef ASSERT | |
| 294 if (UseBiasedLocking) { | |
| 295 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 296 assert(this == _real_malloc_address || | |
| 297 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 298 "bug in forced alignment of thread objects"); | |
| 299 } | |
| 300 #endif /* ASSERT */ | |
| 301 } | |
| 302 | |
| 303 void Thread::initialize_thread_local_storage() { | |
| 304 // Note: Make sure this method only calls | |
| 305 // non-blocking operations. Otherwise, it might not work | |
| 306 // with the thread-startup/safepoint interaction. | |
| 307 | |
| 308 // During Java thread startup, safepoint code should allow this | |
| 309 // method to complete because it may need to allocate memory to | |
| 310 // store information for the new thread. | |
| 311 | |
| 312 // initialize structure dependent on thread local storage | |
| 313 ThreadLocalStorage::set_thread(this); | |
| 314 } | |
| 315 | |
| 316 void Thread::record_stack_base_and_size() { | |
| 317 set_stack_base(os::current_stack_base()); | |
| 318 set_stack_size(os::current_stack_size()); | |
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319 if (is_Java_thread()) { |
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320 ((JavaThread*) this)->set_stack_overflow_limit(); |
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321 } |
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322 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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323 // in initialize_thread(). Without the adjustment, stack size is |
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324 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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325 // So far, only Solaris has real implementation of initialize_thread(). |
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326 // |
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327 // set up any platform-specific state. |
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328 os::initialize_thread(this); |
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329 |
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330 #if INCLUDE_NMT |
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331 // record thread's native stack, stack grows downward |
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332 address stack_low_addr = stack_base() - stack_size(); |
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333 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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334 CURRENT_PC); |
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335 #endif // INCLUDE_NMT |
| 0 | 336 } |
| 337 | |
| 338 | |
| 339 Thread::~Thread() { | |
| 340 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 341 ObjectSynchronizer::omFlush (this) ; | |
| 342 | |
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343 EVENT_THREAD_DESTRUCT(this); |
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344 |
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345 // stack_base can be NULL if the thread is never started or exited before |
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346 // record_stack_base_and_size called. Although, we would like to ensure |
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347 // that all started threads do call record_stack_base_and_size(), there is |
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348 // not proper way to enforce that. |
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349 #if INCLUDE_NMT |
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350 if (_stack_base != NULL) { |
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351 address low_stack_addr = stack_base() - stack_size(); |
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352 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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353 #ifdef ASSERT |
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354 set_stack_base(NULL); |
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355 #endif |
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356 } |
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357 #endif // INCLUDE_NMT |
| 6197 | 358 |
| 0 | 359 // deallocate data structures |
| 360 delete resource_area(); | |
| 361 // since the handle marks are using the handle area, we have to deallocated the root | |
| 362 // handle mark before deallocating the thread's handle area, | |
| 363 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 10135 | 364 delete last_handle_mark(); |
| 365 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 0 | 366 |
| 367 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 368 // We NULL out the fields for good hygiene. | |
| 369 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 370 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 371 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 372 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 373 | |
| 374 delete handle_area(); | |
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375 delete metadata_handles(); |
| 0 | 376 |
| 377 // osthread() can be NULL, if creation of thread failed. | |
| 378 if (osthread() != NULL) os::free_thread(osthread()); | |
| 379 | |
| 380 delete _SR_lock; | |
| 381 | |
| 382 // clear thread local storage if the Thread is deleting itself | |
| 383 if (this == Thread::current()) { | |
| 384 ThreadLocalStorage::set_thread(NULL); | |
| 385 } else { | |
| 386 // In the case where we're not the current thread, invalidate all the | |
| 387 // caches in case some code tries to get the current thread or the | |
| 388 // thread that was destroyed, and gets stale information. | |
| 389 ThreadLocalStorage::invalidate_all(); | |
| 390 } | |
| 391 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 392 } | |
| 393 | |
| 394 // NOTE: dummy function for assertion purpose. | |
| 395 void Thread::run() { | |
| 396 ShouldNotReachHere(); | |
| 397 } | |
| 398 | |
| 399 #ifdef ASSERT | |
| 400 // Private method to check for dangling thread pointer | |
| 401 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 402 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 403 "possibility of dangling Thread pointer"); | |
| 404 } | |
| 405 #endif | |
| 406 | |
| 407 | |
| 408 #ifndef PRODUCT | |
| 409 // Tracing method for basic thread operations | |
| 410 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 411 if (!TraceThreadEvents) return; | |
| 412 ResourceMark rm; | |
| 413 ThreadCritical tc; | |
| 414 const char *name = "non-Java thread"; | |
| 415 int prio = -1; | |
| 416 if (thread->is_Java_thread() | |
| 417 && !thread->is_Compiler_thread()) { | |
| 418 // The Threads_lock must be held to get information about | |
| 419 // this thread but may not be in some situations when | |
| 420 // tracing thread events. | |
| 421 bool release_Threads_lock = false; | |
| 422 if (!Threads_lock->owned_by_self()) { | |
| 423 Threads_lock->lock(); | |
| 424 release_Threads_lock = true; | |
| 425 } | |
| 426 JavaThread* jt = (JavaThread *)thread; | |
| 427 name = (char *)jt->get_thread_name(); | |
| 428 oop thread_oop = jt->threadObj(); | |
| 429 if (thread_oop != NULL) { | |
| 430 prio = java_lang_Thread::priority(thread_oop); | |
| 431 } | |
| 432 if (release_Threads_lock) { | |
| 433 Threads_lock->unlock(); | |
| 434 } | |
| 435 } | |
| 436 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 437 } | |
| 438 #endif | |
| 439 | |
| 440 | |
| 441 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 442 trace("get priority", thread); | |
| 443 ThreadPriority priority; | |
| 444 // Can return an error! | |
| 445 (void)os::get_priority(thread, priority); | |
| 446 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 447 return priority; | |
| 448 } | |
| 449 | |
| 450 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 451 trace("set priority", thread); | |
| 452 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 453 // Can return an error! | |
| 454 (void)os::set_priority(thread, priority); | |
| 455 } | |
| 456 | |
| 457 | |
| 458 void Thread::start(Thread* thread) { | |
| 459 trace("start", thread); | |
| 460 // Start is different from resume in that its safety is guaranteed by context or | |
| 461 // being called from a Java method synchronized on the Thread object. | |
| 462 if (!DisableStartThread) { | |
| 463 if (thread->is_Java_thread()) { | |
| 464 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 465 // Can not set it after the thread started because we do not know the | |
| 466 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 467 // in SLEEPING or some other state. | |
| 468 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 469 java_lang_Thread::RUNNABLE); | |
| 470 } | |
| 471 os::start_thread(thread); | |
| 472 } | |
| 473 } | |
| 474 | |
| 475 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 476 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 477 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 478 VMThread::execute(vm_stop); | |
| 479 } | |
| 480 | |
| 481 | |
| 482 // | |
| 483 // Check if an external suspend request has completed (or has been | |
| 484 // cancelled). Returns true if the thread is externally suspended and | |
| 485 // false otherwise. | |
| 486 // | |
| 487 // The bits parameter returns information about the code path through | |
| 488 // the routine. Useful for debugging: | |
| 489 // | |
| 490 // set in is_ext_suspend_completed(): | |
| 491 // 0x00000001 - routine was entered | |
| 492 // 0x00000010 - routine return false at end | |
| 493 // 0x00000100 - thread exited (return false) | |
| 494 // 0x00000200 - suspend request cancelled (return false) | |
| 495 // 0x00000400 - thread suspended (return true) | |
| 496 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 497 // 0x00002000 - thread is native and walkable (return true) | |
| 498 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 499 // | |
| 500 // set in wait_for_ext_suspend_completion(): | |
| 501 // 0x00010000 - routine was entered | |
| 502 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 503 // 0x00040000 - thread suspended before loop (return true) | |
| 504 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 505 // 0x00100000 - thread suspended in loop (return true) | |
| 506 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 507 // | |
| 508 | |
| 509 // Helper class for tracing suspend wait debug bits. | |
| 510 // | |
| 511 // 0x00000100 indicates that the target thread exited before it could | |
| 512 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 513 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 514 // count as wait failures either. | |
| 515 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 516 | |
| 517 class TraceSuspendDebugBits : public StackObj { | |
| 518 private: | |
| 519 JavaThread * jt; | |
| 520 bool is_wait; | |
| 521 bool called_by_wait; // meaningful when !is_wait | |
| 522 uint32_t * bits; | |
| 523 | |
| 524 public: | |
| 525 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 526 uint32_t *_bits) { | |
| 527 jt = _jt; | |
| 528 is_wait = _is_wait; | |
| 529 called_by_wait = _called_by_wait; | |
| 530 bits = _bits; | |
| 531 } | |
| 532 | |
| 533 ~TraceSuspendDebugBits() { | |
| 534 if (!is_wait) { | |
| 535 #if 1 | |
| 536 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 537 // That trace is very chatty. | |
| 538 return; | |
| 539 #else | |
| 540 if (!called_by_wait) { | |
| 541 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 542 // trace calls to it from wait_for_ext_suspend_completion() | |
| 543 return; | |
| 544 } | |
| 545 #endif | |
| 546 } | |
| 547 | |
| 548 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 549 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 550 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 551 ResourceMark rm; | |
| 552 | |
| 553 tty->print_cr( | |
| 554 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 555 jt->get_thread_name(), *bits); | |
| 556 | |
| 557 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 558 } | |
| 559 } | |
| 560 } | |
| 561 }; | |
| 562 #undef DEBUG_FALSE_BITS | |
| 563 | |
| 564 | |
| 565 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 566 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 567 | |
| 568 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 569 bool do_trans_retry; // flag to force the retry | |
| 570 | |
| 571 *bits |= 0x00000001; | |
| 572 | |
| 573 do { | |
| 574 do_trans_retry = false; | |
| 575 | |
| 576 if (is_exiting()) { | |
| 577 // Thread is in the process of exiting. This is always checked | |
| 578 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 579 *bits |= 0x00000100; | |
| 580 return false; | |
| 581 } | |
| 582 | |
| 583 if (!is_external_suspend()) { | |
| 584 // Suspend request is cancelled. This is always checked before | |
| 585 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 586 // confusing the thread that made the suspend request. | |
| 587 *bits |= 0x00000200; | |
| 588 return false; | |
| 589 } | |
| 590 | |
| 591 if (is_ext_suspended()) { | |
| 592 // thread is suspended | |
| 593 *bits |= 0x00000400; | |
| 594 return true; | |
| 595 } | |
| 596 | |
| 597 // Now that we no longer do hard suspends of threads running | |
| 598 // native code, the target thread can be changing thread state | |
| 599 // while we are in this routine: | |
| 600 // | |
| 601 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 602 // | |
| 603 // We save a copy of the thread state as observed at this moment | |
| 604 // and make our decision about suspend completeness based on the | |
| 605 // copy. This closes the race where the thread state is seen as | |
| 606 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 607 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 608 JavaThreadState save_state = thread_state(); | |
| 609 | |
| 610 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 611 // If the thread's state is _thread_blocked and this blocking | |
| 612 // condition is known to be equivalent to a suspend, then we can | |
| 613 // consider the thread to be externally suspended. This means that | |
| 614 // the code that sets _thread_blocked has been modified to do | |
| 615 // self-suspension if the blocking condition releases. We also | |
| 616 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 617 // the _thread_blocked with self-suspension check. | |
| 618 // | |
| 619 // Return true since we wouldn't be here unless there was still an | |
| 620 // external suspend request. | |
| 621 *bits |= 0x00001000; | |
| 622 return true; | |
| 623 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 624 // Threads running native code will self-suspend on native==>VM/Java | |
| 625 // transitions. If its stack is walkable (should always be the case | |
| 626 // unless this function is called before the actual java_suspend() | |
| 627 // call), then the wait is done. | |
| 628 *bits |= 0x00002000; | |
| 629 return true; | |
| 630 } else if (!called_by_wait && !did_trans_retry && | |
| 631 save_state == _thread_in_native_trans && | |
| 632 frame_anchor()->walkable()) { | |
| 633 // The thread is transitioning from thread_in_native to another | |
| 634 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 635 // will force the thread to self-suspend. If it hasn't gotten | |
| 636 // there yet we may have caught the thread in-between the native | |
| 637 // code check above and the self-suspend. Lucky us. If we were | |
| 638 // called by wait_for_ext_suspend_completion(), then it | |
| 639 // will be doing the retries so we don't have to. | |
| 640 // | |
| 641 // Since we use the saved thread state in the if-statement above, | |
| 642 // there is a chance that the thread has already transitioned to | |
| 643 // _thread_blocked by the time we get here. In that case, we will | |
| 644 // make a single unnecessary pass through the logic below. This | |
| 645 // doesn't hurt anything since we still do the trans retry. | |
| 646 | |
| 647 *bits |= 0x00004000; | |
| 648 | |
| 649 // Once the thread leaves thread_in_native_trans for another | |
| 650 // thread state, we break out of this retry loop. We shouldn't | |
| 651 // need this flag to prevent us from getting back here, but | |
| 652 // sometimes paranoia is good. | |
| 653 did_trans_retry = true; | |
| 654 | |
| 655 // We wait for the thread to transition to a more usable state. | |
| 656 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 657 // We used to do an "os::yield_all(i)" call here with the intention | |
| 658 // that yielding would increase on each retry. However, the parameter | |
| 659 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 660 // on the SR_lock below provides a much more predictable scale up for | |
| 661 // the delay. It also provides a simple/direct point to check for any | |
| 662 // safepoint requests from the VMThread | |
| 663 | |
| 664 // temporarily drops SR_lock while doing wait with safepoint check | |
| 665 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 666 // and increase delay with each retry | |
| 667 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 668 | |
| 669 // check the actual thread state instead of what we saved above | |
| 670 if (thread_state() != _thread_in_native_trans) { | |
| 671 // the thread has transitioned to another thread state so | |
| 672 // try all the checks (except this one) one more time. | |
| 673 do_trans_retry = true; | |
| 674 break; | |
| 675 } | |
| 676 } // end retry loop | |
| 677 | |
| 678 | |
| 679 } | |
| 680 } while (do_trans_retry); | |
| 681 | |
| 682 *bits |= 0x00000010; | |
| 683 return false; | |
| 684 } | |
| 685 | |
| 686 // | |
| 687 // Wait for an external suspend request to complete (or be cancelled). | |
| 688 // Returns true if the thread is externally suspended and false otherwise. | |
| 689 // | |
| 690 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 691 uint32_t *bits) { | |
| 692 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 693 false /* !called_by_wait */, bits); | |
| 694 | |
| 695 // local flag copies to minimize SR_lock hold time | |
| 696 bool is_suspended; | |
| 697 bool pending; | |
| 698 uint32_t reset_bits; | |
| 699 | |
| 700 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 701 *bits |= 0x00010000; | |
| 702 | |
| 703 // We use reset_bits to reinitialize the bits value at the top of | |
| 704 // each retry loop. This allows the caller to make use of any | |
| 705 // unused bits for their own marking purposes. | |
| 706 reset_bits = *bits; | |
| 707 | |
| 708 { | |
| 709 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 710 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 711 delay, bits); | |
| 712 pending = is_external_suspend(); | |
| 713 } | |
| 714 // must release SR_lock to allow suspension to complete | |
| 715 | |
| 716 if (!pending) { | |
| 717 // A cancelled suspend request is the only false return from | |
| 718 // is_ext_suspend_completed() that keeps us from entering the | |
| 719 // retry loop. | |
| 720 *bits |= 0x00020000; | |
| 721 return false; | |
| 722 } | |
| 723 | |
| 724 if (is_suspended) { | |
| 725 *bits |= 0x00040000; | |
| 726 return true; | |
| 727 } | |
| 728 | |
| 729 for (int i = 1; i <= retries; i++) { | |
| 730 *bits = reset_bits; // reinit to only track last retry | |
| 731 | |
| 732 // We used to do an "os::yield_all(i)" call here with the intention | |
| 733 // that yielding would increase on each retry. However, the parameter | |
| 734 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 735 // on the SR_lock below provides a much more predictable scale up for | |
| 736 // the delay. It also provides a simple/direct point to check for any | |
| 737 // safepoint requests from the VMThread | |
| 738 | |
| 739 { | |
| 740 MutexLocker ml(SR_lock()); | |
| 741 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 742 // can also call this) and increase delay with each retry | |
| 743 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 744 | |
| 745 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 746 delay, bits); | |
| 747 | |
| 748 // It is possible for the external suspend request to be cancelled | |
| 749 // (by a resume) before the actual suspend operation is completed. | |
| 750 // Refresh our local copy to see if we still need to wait. | |
| 751 pending = is_external_suspend(); | |
| 752 } | |
| 753 | |
| 754 if (!pending) { | |
| 755 // A cancelled suspend request is the only false return from | |
| 756 // is_ext_suspend_completed() that keeps us from staying in the | |
| 757 // retry loop. | |
| 758 *bits |= 0x00080000; | |
| 759 return false; | |
| 760 } | |
| 761 | |
| 762 if (is_suspended) { | |
| 763 *bits |= 0x00100000; | |
| 764 return true; | |
| 765 } | |
| 766 } // end retry loop | |
| 767 | |
| 768 // thread did not suspend after all our retries | |
| 769 *bits |= 0x00200000; | |
| 770 return false; | |
| 771 } | |
| 772 | |
| 773 #ifndef PRODUCT | |
| 774 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 775 | |
| 776 // This should not need to be atomic as the only way for simultaneous | |
| 777 // updates is via interrupts. Even then this should be rare or non-existant | |
| 778 // and we don't care that much anyway. | |
| 779 | |
| 780 int index = _jmp_ring_index; | |
| 781 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 782 _jmp_ring[index]._target = (intptr_t) target; | |
| 783 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 784 _jmp_ring[index]._file = file; | |
| 785 _jmp_ring[index]._line = line; | |
| 786 } | |
| 787 #endif /* PRODUCT */ | |
| 788 | |
| 789 // Called by flat profiler | |
| 790 // Callers have already called wait_for_ext_suspend_completion | |
| 791 // The assertion for that is currently too complex to put here: | |
| 792 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 793 bool gotframe = false; | |
| 794 // self suspension saves needed state. | |
| 795 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 796 *_fr = pd_last_frame(); | |
| 797 gotframe = true; | |
| 798 } | |
| 799 return gotframe; | |
| 800 } | |
| 801 | |
| 802 void Thread::interrupt(Thread* thread) { | |
| 803 trace("interrupt", thread); | |
| 804 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 805 os::interrupt(thread); | |
| 806 } | |
| 807 | |
| 808 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 809 trace("is_interrupted", thread); | |
| 810 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 811 // Note: If clear_interrupted==false, this simply fetches and | |
| 812 // returns the value of the field osthread()->interrupted(). | |
| 813 return os::is_interrupted(thread, clear_interrupted); | |
| 814 } | |
| 815 | |
| 816 | |
| 817 // GC Support | |
| 818 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 819 jint thread_parity = _oops_do_parity; | |
| 820 if (thread_parity != strong_roots_parity) { | |
| 821 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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822 if (res == thread_parity) { |
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823 return true; |
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824 } else { |
| 0 | 825 guarantee(res == strong_roots_parity, "Or else what?"); |
|
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826 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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827 "Should only fail when parallel."); |
| 0 | 828 return false; |
| 829 } | |
| 830 } | |
|
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831 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 832 "Should only fail when parallel."); |
| 833 return false; | |
| 834 } | |
| 835 | |
|
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836 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 837 active_handles()->oops_do(f); |
| 838 // Do oop for ThreadShadow | |
| 839 f->do_oop((oop*)&_pending_exception); | |
| 840 handle_area()->oops_do(f); | |
| 841 } | |
| 842 | |
|
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843 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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844 // no nmethods in a generic thread... |
| 0 | 845 } |
| 846 | |
|
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847 void Thread::metadata_do(void f(Metadata*)) { |
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848 if (metadata_handles() != NULL) { |
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849 for (int i = 0; i< metadata_handles()->length(); i++) { |
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850 f(metadata_handles()->at(i)); |
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851 } |
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852 } |
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853 } |
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854 |
| 0 | 855 void Thread::print_on(outputStream* st) const { |
| 856 // get_priority assumes osthread initialized | |
| 857 if (osthread() != NULL) { | |
| 6766 | 858 int os_prio; |
| 859 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 860 st->print("os_prio=%d ", os_prio); | |
| 861 } | |
| 862 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 863 osthread()->print_on(st); |
| 864 } | |
| 865 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 866 } | |
| 867 | |
| 868 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 869 // any lock or allocate memory. | |
| 870 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 871 if (is_VM_thread()) st->print("VMThread"); | |
| 872 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 873 else if (is_Java_thread()) st->print("JavaThread"); | |
| 874 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 875 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 876 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 877 else st->print("Thread"); | |
| 878 | |
| 879 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 880 _stack_base - _stack_size, _stack_base); | |
| 881 | |
| 882 if (osthread()) { | |
| 883 st->print(" [id=%d]", osthread()->thread_id()); | |
| 884 } | |
| 885 } | |
| 886 | |
| 887 #ifdef ASSERT | |
| 888 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 889 Monitor *cur = _owned_locks; | |
| 890 if (cur == NULL) { | |
| 891 st->print(" (no locks) "); | |
| 892 } else { | |
| 893 st->print_cr(" Locks owned:"); | |
| 894 while(cur) { | |
| 895 cur->print_on(st); | |
| 896 cur = cur->next(); | |
| 897 } | |
| 898 } | |
| 899 } | |
| 900 | |
| 901 static int ref_use_count = 0; | |
| 902 | |
| 903 bool Thread::owns_locks_but_compiled_lock() const { | |
| 904 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 905 if (cur != Compile_lock) return true; | |
| 906 } | |
| 907 return false; | |
| 908 } | |
| 909 | |
| 910 | |
| 911 #endif | |
| 912 | |
| 913 #ifndef PRODUCT | |
| 914 | |
| 915 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 916 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 917 // no threads which allow_vm_block's are held | |
| 918 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 919 // Check if current thread is allowed to block at a safepoint | |
| 920 if (!(_allow_safepoint_count == 0)) | |
| 921 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 922 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 923 fatal("LEAF method calling lock?"); | |
| 924 } | |
| 925 | |
| 926 #ifdef ASSERT | |
| 927 if (potential_vm_operation && is_Java_thread() | |
| 928 && !Universe::is_bootstrapping()) { | |
| 929 // Make sure we do not hold any locks that the VM thread also uses. | |
| 930 // This could potentially lead to deadlocks | |
| 931 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 932 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 933 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 934 // since it is used to transfer control between JavaThreads and the VMThread | |
| 935 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 936 if ( (cur->allow_vm_block() && | |
| 937 cur != Threads_lock && | |
| 938 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 939 cur != VMOperationRequest_lock && | |
| 940 cur != VMOperationQueue_lock) || | |
| 941 cur->rank() == Mutex::special) { | |
| 942 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 943 } | |
| 944 } | |
| 945 } | |
| 946 | |
| 947 if (GCALotAtAllSafepoints) { | |
| 948 // We could enter a safepoint here and thus have a gc | |
| 949 InterfaceSupport::check_gc_alot(); | |
| 950 } | |
| 951 #endif | |
| 952 } | |
| 953 #endif | |
| 954 | |
| 955 bool Thread::is_in_stack(address adr) const { | |
| 956 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 957 address end = os::current_stack_pointer(); | |
|
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958 // Allow non Java threads to call this without stack_base |
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959 if (_stack_base == NULL) return true; |
| 0 | 960 if (stack_base() >= adr && adr >= end) return true; |
| 961 | |
| 962 return false; | |
| 963 } | |
| 964 | |
| 965 | |
|
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966 bool Thread::is_in_usable_stack(address adr) const { |
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967 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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968 size_t usable_stack_size = _stack_size - stack_guard_size; |
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969 |
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970 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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971 } |
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972 |
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973 |
| 0 | 974 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
| 975 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 976 // used for compilation in the future. If that change is made, the need for these methods | |
| 977 // should be revisited, and they should be removed if possible. | |
| 978 | |
| 979 bool Thread::is_lock_owned(address adr) const { | |
|
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980 return on_local_stack(adr); |
| 0 | 981 } |
| 982 | |
| 983 bool Thread::set_as_starting_thread() { | |
| 984 // NOTE: this must be called inside the main thread. | |
| 985 return os::create_main_thread((JavaThread*)this); | |
| 986 } | |
| 987 | |
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988 static void initialize_class(Symbol* class_name, TRAPS) { |
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989 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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990 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 991 } |
| 992 | |
| 993 | |
| 994 // Creates the initial ThreadGroup | |
| 995 static Handle create_initial_thread_group(TRAPS) { | |
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996 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 997 instanceKlassHandle klass (THREAD, k); |
| 998 | |
| 999 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 1000 { | |
| 1001 JavaValue result(T_VOID); | |
| 1002 JavaCalls::call_special(&result, | |
| 1003 system_instance, | |
| 1004 klass, | |
|
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1005 vmSymbols::object_initializer_name(), |
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1006 vmSymbols::void_method_signature(), |
| 0 | 1007 CHECK_NH); |
| 1008 } | |
| 1009 Universe::set_system_thread_group(system_instance()); | |
| 1010 | |
| 1011 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 1012 { | |
| 1013 JavaValue result(T_VOID); | |
| 1014 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 1015 JavaCalls::call_special(&result, | |
| 1016 main_instance, | |
| 1017 klass, | |
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1018 vmSymbols::object_initializer_name(), |
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1019 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1020 system_instance, |
| 1021 string, | |
| 1022 CHECK_NH); | |
| 1023 } | |
| 1024 return main_instance; | |
| 1025 } | |
| 1026 | |
| 1027 // Creates the initial Thread | |
| 1028 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1029 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1030 instanceKlassHandle klass (THREAD, k); |
| 1031 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1032 | |
| 1033 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1034 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1035 thread->set_threadObj(thread_oop()); | |
| 1036 | |
| 1037 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1038 | |
| 1039 JavaValue result(T_VOID); | |
| 1040 JavaCalls::call_special(&result, thread_oop, | |
| 1041 klass, | |
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1042 vmSymbols::object_initializer_name(), |
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1043 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1044 thread_group, |
| 1045 string, | |
| 1046 CHECK_NULL); | |
| 1047 return thread_oop(); | |
| 1048 } | |
| 1049 | |
| 1050 static void call_initializeSystemClass(TRAPS) { | |
|
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1051 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1052 instanceKlassHandle klass (THREAD, k); |
| 1053 | |
| 1054 JavaValue result(T_VOID); | |
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1055 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1056 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1057 } |
| 1058 | |
| 6181 | 1059 char java_runtime_name[128] = ""; |
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1060 char java_runtime_version[128] = ""; |
| 6181 | 1061 |
| 1062 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1063 static const char* get_java_runtime_name(TRAPS) { | |
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1064 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1065 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1066 fieldDescriptor fd; | |
| 1067 bool found = k != NULL && | |
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1068 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1069 vmSymbols::string_signature(), &fd); |
| 1070 if (found) { | |
| 1071 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1072 if (name_oop == NULL) | |
| 1073 return NULL; | |
| 1074 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1075 java_runtime_name, | |
| 1076 sizeof(java_runtime_name)); | |
| 1077 return name; | |
| 1078 } else { | |
| 1079 return NULL; | |
| 1080 } | |
| 1081 } | |
| 1082 | |
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1083 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1084 static const char* get_java_runtime_version(TRAPS) { |
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1085 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1086 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1087 fieldDescriptor fd; |
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1088 bool found = k != NULL && |
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1089 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1090 vmSymbols::string_signature(), &fd); |
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1091 if (found) { |
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1092 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1093 if (name_oop == NULL) |
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1094 return NULL; |
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1095 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1096 java_runtime_version, |
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1097 sizeof(java_runtime_version)); |
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1098 return name; |
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1099 } else { |
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1100 return NULL; |
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1101 } |
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1102 } |
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1103 |
|
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1104 // General purpose hook into Java code, run once when the VM is initialized. |
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1105 // The Java library method itself may be changed independently from the VM. |
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1106 static void call_postVMInitHook(TRAPS) { |
|
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1107 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD); |
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1108 instanceKlassHandle klass (THREAD, k); |
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1109 if (klass.not_null()) { |
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1110 JavaValue result(T_VOID); |
|
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1111 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1112 vmSymbols::void_method_signature(), |
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1113 CHECK); |
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1114 } |
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1115 } |
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1116 |
| 0 | 1117 static void reset_vm_info_property(TRAPS) { |
| 1118 // the vm info string | |
| 1119 ResourceMark rm(THREAD); | |
| 1120 const char *vm_info = VM_Version::vm_info_string(); | |
| 1121 | |
| 1122 // java.lang.System class | |
|
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1123 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1124 instanceKlassHandle klass (THREAD, k); |
| 1125 | |
| 1126 // setProperty arguments | |
| 1127 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1128 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1129 | |
| 1130 // return value | |
| 1131 JavaValue r(T_OBJECT); | |
| 1132 | |
| 1133 // public static String setProperty(String key, String value); | |
| 1134 JavaCalls::call_static(&r, | |
| 1135 klass, | |
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1136 vmSymbols::setProperty_name(), |
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1137 vmSymbols::string_string_string_signature(), |
| 0 | 1138 key_str, |
| 1139 value_str, | |
| 1140 CHECK); | |
| 1141 } | |
| 1142 | |
| 1143 | |
| 1144 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1145 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1146 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1147 | |
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1148 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1149 instanceKlassHandle klass (THREAD, k); |
| 1150 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1151 | |
| 1152 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1153 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1154 set_threadObj(thread_oop()); | |
| 1155 | |
| 1156 JavaValue result(T_VOID); | |
| 1157 if (thread_name != NULL) { | |
| 1158 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1159 // Thread gets assigned specified name and null target | |
| 1160 JavaCalls::call_special(&result, | |
| 1161 thread_oop, | |
| 1162 klass, | |
|
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1163 vmSymbols::object_initializer_name(), |
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1164 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1165 thread_group, // Argument 1 |
| 1166 name, // Argument 2 | |
| 1167 THREAD); | |
| 1168 } else { | |
| 1169 // Thread gets assigned name "Thread-nnn" and null target | |
| 1170 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1171 JavaCalls::call_special(&result, | |
| 1172 thread_oop, | |
| 1173 klass, | |
|
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1174 vmSymbols::object_initializer_name(), |
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1175 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1176 thread_group, // Argument 1 |
| 1177 Handle(), // Argument 2 | |
| 1178 THREAD); | |
| 1179 } | |
| 1180 | |
| 1181 | |
| 1182 if (daemon) { | |
| 1183 java_lang_Thread::set_daemon(thread_oop()); | |
| 1184 } | |
| 1185 | |
| 1186 if (HAS_PENDING_EXCEPTION) { | |
| 1187 return; | |
| 1188 } | |
| 1189 | |
| 1142 | 1190 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1191 Handle threadObj(this, this->threadObj()); |
| 1192 | |
| 1193 JavaCalls::call_special(&result, | |
| 1194 thread_group, | |
| 1195 group, | |
|
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1196 vmSymbols::add_method_name(), |
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1197 vmSymbols::thread_void_signature(), |
| 0 | 1198 threadObj, // Arg 1 |
| 1199 THREAD); | |
| 1200 | |
| 1201 | |
| 1202 } | |
| 1203 | |
| 1204 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1205 // uniquely named instances should derive from this. | |
| 1206 NamedThread::NamedThread() : Thread() { | |
| 1207 _name = NULL; | |
|
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1208 _processed_thread = NULL; |
| 0 | 1209 } |
| 1210 | |
| 1211 NamedThread::~NamedThread() { | |
| 1212 if (_name != NULL) { | |
| 6197 | 1213 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1214 _name = NULL; |
| 1215 } | |
| 1216 } | |
| 1217 | |
| 1218 void NamedThread::set_name(const char* format, ...) { | |
| 1219 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1220 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1221 guarantee(_name != NULL, "alloc failure"); |
| 1222 va_list ap; | |
| 1223 va_start(ap, format); | |
| 1224 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1225 va_end(ap); | |
| 1226 } | |
| 1227 | |
| 1228 // ======= WatcherThread ======== | |
| 1229 | |
| 1230 // The watcher thread exists to simulate timer interrupts. It should | |
| 1231 // be replaced by an abstraction over whatever native support for | |
| 1232 // timer interrupts exists on the platform. | |
| 1233 | |
| 1234 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1235 bool WatcherThread::_startable = false; |
|
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1236 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1237 |
| 11151 | 1238 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
| 0 | 1239 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
| 1240 if (os::create_thread(this, os::watcher_thread)) { | |
| 1241 _watcher_thread = this; | |
| 1242 | |
| 1243 // Set the watcher thread to the highest OS priority which should not be | |
| 1244 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1245 // is created. The only normal thread using this priority is the reference | |
| 1246 // handler thread, which runs for very short intervals only. | |
| 1247 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1248 // will be inaccurate. | |
| 1249 os::set_priority(this, MaxPriority); | |
| 1250 if (!DisableStartThread) { | |
| 1251 os::start_thread(this); | |
| 1252 } | |
| 1253 } | |
| 1254 } | |
| 1255 | |
|
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1256 int WatcherThread::sleep() const { |
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1257 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1258 |
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1259 // remaining will be zero if there are no tasks, |
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1260 // causing the WatcherThread to sleep until a task is |
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1261 // enrolled |
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1262 int remaining = PeriodicTask::time_to_wait(); |
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1263 int time_slept = 0; |
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1264 |
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1265 // we expect this to timeout - we only ever get unparked when |
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1266 // we should terminate or when a new task has been enrolled |
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1267 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1268 |
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1269 jlong time_before_loop = os::javaTimeNanos(); |
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1270 |
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1271 for (;;) { |
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1272 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1273 jlong now = os::javaTimeNanos(); |
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1274 |
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1275 if (remaining == 0) { |
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1276 // if we didn't have any tasks we could have waited for a long time |
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1277 // consider the time_slept zero and reset time_before_loop |
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1278 time_slept = 0; |
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1279 time_before_loop = now; |
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1280 } else { |
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1281 // need to recalulate since we might have new tasks in _tasks |
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1282 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1283 } |
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1284 |
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1285 // Change to task list or spurious wakeup of some kind |
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1286 if (timedout || _should_terminate) { |
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1287 break; |
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1288 } |
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1289 |
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1290 remaining = PeriodicTask::time_to_wait(); |
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1291 if (remaining == 0) { |
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1292 // Last task was just disenrolled so loop around and wait until |
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1293 // another task gets enrolled |
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1294 continue; |
|
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1295 } |
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1296 |
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1297 remaining -= time_slept; |
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1298 if (remaining <= 0) |
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1299 break; |
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1300 } |
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1301 |
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1302 return time_slept; |
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1303 } |
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1304 |
| 0 | 1305 void WatcherThread::run() { |
| 1306 assert(this == watcher_thread(), "just checking"); | |
| 1307 | |
| 1308 this->record_stack_base_and_size(); | |
| 1309 this->initialize_thread_local_storage(); | |
| 1310 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1311 while(!_should_terminate) { | |
| 1312 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1313 assert(watcher_thread() == this, "thread consistency check"); | |
| 1314 | |
| 1315 // Calculate how long it'll be until the next PeriodicTask work | |
| 1316 // should be done, and sleep that amount of time. | |
|
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1317 int time_waited = sleep(); |
| 0 | 1318 |
| 1319 if (is_error_reported()) { | |
| 1320 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1321 // should abort JVM after creating an error log file. However in some | |
| 1322 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1323 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1324 // | |
| 1325 // This code is in WatcherThread because WatcherThread wakes up | |
| 1326 // periodically so the fatal error handler doesn't need to do anything; | |
| 1327 // also because the WatcherThread is less likely to crash than other | |
| 1328 // threads. | |
| 1329 | |
| 1330 for (;;) { | |
| 1331 if (!ShowMessageBoxOnError | |
| 1332 && (OnError == NULL || OnError[0] == '\0') | |
| 1333 && Arguments::abort_hook() == NULL) { | |
| 1334 os::sleep(this, 2 * 60 * 1000, false); | |
| 1335 fdStream err(defaultStream::output_fd()); | |
| 1336 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1337 // skip atexit/vm_exit/vm_abort hooks | |
| 1338 os::die(); | |
| 1339 } | |
| 1340 | |
| 1341 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1342 // ShowMessageBoxOnError when it is ready to abort. | |
| 1343 os::sleep(this, 5 * 1000, false); | |
| 1344 } | |
| 1345 } | |
| 1346 | |
|
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1347 PeriodicTask::real_time_tick(time_waited); |
| 0 | 1348 } |
| 1349 | |
| 1350 // Signal that it is terminated | |
| 1351 { | |
| 1352 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1353 _watcher_thread = NULL; | |
| 1354 Terminator_lock->notify(); | |
| 1355 } | |
| 1356 | |
| 1357 // Thread destructor usually does this.. | |
| 1358 ThreadLocalStorage::set_thread(NULL); | |
| 1359 } | |
| 1360 | |
| 1361 void WatcherThread::start() { | |
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1362 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1363 |
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1364 if (watcher_thread() == NULL && _startable) { |
| 0 | 1365 _should_terminate = false; |
| 1366 // Create the single instance of WatcherThread | |
| 1367 new WatcherThread(); | |
| 1368 } | |
| 1369 } | |
| 1370 | |
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1371 void WatcherThread::make_startable() { |
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1372 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1373 _startable = true; |
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1374 } |
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1375 |
| 0 | 1376 void WatcherThread::stop() { |
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1377 { |
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1378 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1379 _should_terminate = true; |
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1380 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1381 |
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1382 WatcherThread* watcher = watcher_thread(); |
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1383 if (watcher != NULL) |
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1384 watcher->unpark(); |
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1385 } |
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1386 |
| 0 | 1387 // it is ok to take late safepoints here, if needed |
| 1388 MutexLocker mu(Terminator_lock); | |
|
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1389 |
| 0 | 1390 while(watcher_thread() != NULL) { |
| 1391 // This wait should make safepoint checks, wait without a timeout, | |
| 1392 // and wait as a suspend-equivalent condition. | |
| 1393 // | |
| 1394 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1395 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1396 // FlatProfiler task, is waiting for the external suspend request on | |
| 1397 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1398 // eventually timeout, but that takes time. Making this wait a | |
| 1399 // suspend-equivalent condition solves that timeout problem. | |
| 1400 // | |
| 1401 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1402 Mutex::_as_suspend_equivalent_flag); | |
| 1403 } | |
| 1404 } | |
| 1405 | |
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1406 void WatcherThread::unpark() { |
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1407 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1408 PeriodicTask_lock->notify(); |
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1409 } |
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1410 |
| 0 | 1411 void WatcherThread::print_on(outputStream* st) const { |
| 1412 st->print("\"%s\" ", name()); | |
| 1413 Thread::print_on(st); | |
| 1414 st->cr(); | |
| 1415 } | |
| 1416 | |
| 1417 // ======= JavaThread ======== | |
| 1418 | |
| 1419 // A JavaThread is a normal Java thread | |
| 1420 | |
| 1421 void JavaThread::initialize() { | |
| 1422 // Initialize fields | |
|
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1423 |
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1424 // Set the claimed par_id to UINT_MAX (ie not claiming any par_ids) |
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1425 set_claimed_par_id(UINT_MAX); |
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1426 |
| 0 | 1427 set_saved_exception_pc(NULL); |
| 1428 set_threadObj(NULL); | |
| 1429 _anchor.clear(); | |
| 1430 set_entry_point(NULL); | |
| 1431 set_jni_functions(jni_functions()); | |
| 1432 set_callee_target(NULL); | |
| 1433 set_vm_result(NULL); | |
| 1434 set_vm_result_2(NULL); | |
| 1435 set_vframe_array_head(NULL); | |
| 1436 set_vframe_array_last(NULL); | |
| 1437 set_deferred_locals(NULL); | |
| 1438 set_deopt_mark(NULL); | |
|
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1439 set_deopt_nmethod(NULL); |
| 0 | 1440 clear_must_deopt_id(); |
| 1441 set_monitor_chunks(NULL); | |
| 1442 set_next(NULL); | |
| 1443 set_thread_state(_thread_new); | |
|
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1444 #if INCLUDE_NMT |
| 6197 | 1445 set_recorder(NULL); |
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1446 #endif |
| 0 | 1447 _terminated = _not_terminated; |
| 1448 _privileged_stack_top = NULL; | |
| 1449 _array_for_gc = NULL; | |
| 1450 _suspend_equivalent = false; | |
| 1451 _in_deopt_handler = 0; | |
| 1452 _doing_unsafe_access = false; | |
| 1453 _stack_guard_state = stack_guard_unused; | |
|
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1454 (void)const_cast<oop&>(_exception_oop = NULL); |
| 0 | 1455 _exception_pc = 0; |
| 1456 _exception_handler_pc = 0; | |
| 1903 | 1457 _is_method_handle_return = 0; |
| 0 | 1458 _jvmti_thread_state= NULL; |
|
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1459 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1460 _jvmti_get_loaded_classes_closure = NULL; |
| 1461 _interp_only_mode = 0; | |
| 1462 _special_runtime_exit_condition = _no_async_condition; | |
| 1463 _pending_async_exception = NULL; | |
| 1464 _thread_stat = NULL; | |
| 1465 _thread_stat = new ThreadStatistics(); | |
| 1466 _blocked_on_compilation = false; | |
| 1467 _jni_active_critical = 0; | |
| 1468 _do_not_unlock_if_synchronized = false; | |
| 1469 _cached_monitor_info = NULL; | |
| 1470 _parker = Parker::Allocate(this) ; | |
| 1471 | |
| 1472 #ifndef PRODUCT | |
| 1473 _jmp_ring_index = 0; | |
| 1474 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1475 record_jump(NULL, NULL, NULL, 0); | |
| 1476 } | |
| 1477 #endif /* PRODUCT */ | |
| 1478 | |
| 1479 set_thread_profiler(NULL); | |
| 1480 if (FlatProfiler::is_active()) { | |
| 1481 // This is where we would decide to either give each thread it's own profiler | |
| 1482 // or use one global one from FlatProfiler, | |
| 1483 // or up to some count of the number of profiled threads, etc. | |
| 1484 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1485 pp->engage(); | |
| 1486 set_thread_profiler(pp); | |
| 1487 } | |
| 1488 | |
| 1489 // Setup safepoint state info for this thread | |
| 1490 ThreadSafepointState::create(this); | |
| 1491 | |
| 1492 debug_only(_java_call_counter = 0); | |
| 1493 | |
| 1494 // JVMTI PopFrame support | |
| 1495 _popframe_condition = popframe_inactive; | |
| 1496 _popframe_preserved_args = NULL; | |
| 1497 _popframe_preserved_args_size = 0; | |
| 1498 | |
| 1499 pd_initialize(); | |
| 1500 } | |
| 1501 | |
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1502 #if INCLUDE_ALL_GCS |
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1503 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1504 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1505 #endif // INCLUDE_ALL_GCS |
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1506 |
| 4006 | 1507 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1508 Thread() |
|
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1509 #if INCLUDE_ALL_GCS |
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1510 , _satb_mark_queue(&_satb_mark_queue_set), |
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1511 _dirty_card_queue(&_dirty_card_queue_set) |
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1512 #endif // INCLUDE_ALL_GCS |
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1513 { |
| 0 | 1514 initialize(); |
| 4006 | 1515 if (is_attaching_via_jni) { |
| 1516 _jni_attach_state = _attaching_via_jni; | |
| 1517 } else { | |
| 1518 _jni_attach_state = _not_attaching_via_jni; | |
| 1519 } | |
|
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1520 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
| 6197 | 1521 _safepoint_visible = false; |
| 0 | 1522 } |
| 1523 | |
| 1524 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1525 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1526 return true; // Stack already guarded or guard pages not needed. | |
| 1527 } | |
| 1528 | |
| 1529 if (register_stack_overflow()) { | |
| 1530 // For those architectures which have separate register and | |
| 1531 // memory stacks, we must check the register stack to see if | |
| 1532 // it has overflowed. | |
| 1533 return false; | |
| 1534 } | |
| 1535 | |
| 1536 // Java code never executes within the yellow zone: the latter is only | |
| 1537 // there to provoke an exception during stack banging. If java code | |
| 1538 // is executing there, either StackShadowPages should be larger, or | |
| 1539 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1540 // when it should. | |
| 1541 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1542 | |
| 1543 enable_stack_yellow_zone(); | |
| 1544 return true; | |
| 1545 } | |
| 1546 | |
| 1547 bool JavaThread::reguard_stack(void) { | |
| 1548 return reguard_stack(os::current_stack_pointer()); | |
| 1549 } | |
| 1550 | |
| 1551 | |
| 1552 void JavaThread::block_if_vm_exited() { | |
| 1553 if (_terminated == _vm_exited) { | |
| 1554 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1555 // we will block here forever | |
| 1556 Threads_lock->lock_without_safepoint_check(); | |
| 1557 ShouldNotReachHere(); | |
| 1558 } | |
| 1559 } | |
| 1560 | |
| 1561 | |
| 1562 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1563 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1564 | |
|
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1565 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1566 Thread() |
|
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1567 #if INCLUDE_ALL_GCS |
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1568 , _satb_mark_queue(&_satb_mark_queue_set), |
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1569 _dirty_card_queue(&_dirty_card_queue_set) |
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1570 #endif // INCLUDE_ALL_GCS |
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1571 { |
| 0 | 1572 if (TraceThreadEvents) { |
| 1573 tty->print_cr("creating thread %p", this); | |
| 1574 } | |
| 1575 initialize(); | |
| 4006 | 1576 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1577 set_entry_point(entry_point); |
| 1578 // Create the native thread itself. | |
| 1579 // %note runtime_23 | |
| 1580 os::ThreadType thr_type = os::java_thread; | |
| 1581 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1582 os::java_thread; | |
| 1583 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1584 _safepoint_visible = false; |
| 0 | 1585 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1586 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1587 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1588 // the exception consists of creating the exception object & initializing it, initialization | |
| 1589 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1590 // | |
| 1591 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1592 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1593 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1594 // object must be fully initialized (take a look at JVM_Start) | |
| 1595 } | |
| 1596 | |
| 1597 JavaThread::~JavaThread() { | |
| 1598 if (TraceThreadEvents) { | |
| 1599 tty->print_cr("terminate thread %p", this); | |
| 1600 } | |
| 1601 | |
|
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1602 // By now, this thread should already be invisible to safepoint, |
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1603 // and its per-thread recorder also collected. |
| 6197 | 1604 assert(!is_safepoint_visible(), "wrong state"); |
|
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1605 #if INCLUDE_NMT |
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1606 assert(get_recorder() == NULL, "Already collected"); |
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1607 #endif // INCLUDE_NMT |
| 6197 | 1608 |
| 0 | 1609 // JSR166 -- return the parker to the free list |
| 1610 Parker::Release(_parker); | |
| 1611 _parker = NULL ; | |
| 1612 | |
| 1613 // Free any remaining previous UnrollBlock | |
| 1614 vframeArray* old_array = vframe_array_last(); | |
| 1615 | |
| 1616 if (old_array != NULL) { | |
| 1617 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1618 old_array->set_unroll_block(NULL); | |
| 1619 delete old_info; | |
| 1620 delete old_array; | |
| 1621 } | |
| 1622 | |
| 1623 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1624 if (deferred != NULL) { | |
| 1625 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1626 assert(deferred->length() != 0, "empty array!"); | |
| 1627 do { | |
| 1628 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1629 deferred->remove_at(0); | |
| 1630 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1631 delete dlv; | |
| 1632 } while (deferred->length() != 0); | |
| 1633 delete deferred; | |
| 1634 } | |
| 1635 | |
| 1636 // All Java related clean up happens in exit | |
| 1637 ThreadSafepointState::destroy(this); | |
| 1638 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1639 if (_thread_stat != NULL) delete _thread_stat; | |
| 1640 } | |
| 1641 | |
| 1642 | |
| 1643 // The first routine called by a new Java thread | |
| 1644 void JavaThread::run() { | |
| 1645 // initialize thread-local alloc buffer related fields | |
| 1646 this->initialize_tlab(); | |
| 1647 | |
| 1648 // used to test validitity of stack trace backs | |
| 1649 this->record_base_of_stack_pointer(); | |
| 1650 | |
| 1651 // Record real stack base and size. | |
| 1652 this->record_stack_base_and_size(); | |
| 1653 | |
| 1654 // Initialize thread local storage; set before calling MutexLocker | |
| 1655 this->initialize_thread_local_storage(); | |
| 1656 | |
| 1657 this->create_stack_guard_pages(); | |
| 1658 | |
|
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1659 this->cache_global_variables(); |
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1660 |
| 0 | 1661 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1662 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1663 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1664 | |
| 1665 assert(JavaThread::current() == this, "sanity check"); | |
| 1666 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1667 | |
| 1668 DTRACE_THREAD_PROBE(start, this); | |
| 1669 | |
| 1670 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1671 // been completed. | |
| 1672 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1673 | |
| 1674 if (JvmtiExport::should_post_thread_life()) { | |
| 1675 JvmtiExport::post_thread_start(this); | |
| 1676 } | |
| 1677 | |
| 10405 | 1678 EventThreadStart event; |
| 1679 if (event.should_commit()) { | |
| 1680 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1681 event.commit(); | |
| 1682 } | |
|
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1683 |
| 0 | 1684 // We call another function to do the rest so we are sure that the stack addresses used |
| 1685 // from there will be lower than the stack base just computed | |
| 1686 thread_main_inner(); | |
| 1687 | |
| 1688 // Note, thread is no longer valid at this point! | |
| 1689 } | |
| 1690 | |
| 1691 | |
| 1692 void JavaThread::thread_main_inner() { | |
| 1693 assert(JavaThread::current() == this, "sanity check"); | |
| 1694 assert(this->threadObj() != NULL, "just checking"); | |
| 1695 | |
|
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1696 // Execute thread entry point unless this thread has a pending exception |
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1697 // or has been stopped before starting. |
| 0 | 1698 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1699 if (!this->has_pending_exception() && |
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1700 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1701 { |
| 1702 ResourceMark rm(this); | |
| 1703 this->set_native_thread_name(this->get_thread_name()); | |
| 1704 } | |
| 0 | 1705 HandleMark hm(this); |
| 1706 this->entry_point()(this, this); | |
| 1707 } | |
| 1708 | |
| 1709 DTRACE_THREAD_PROBE(stop, this); | |
| 1710 | |
| 1711 this->exit(false); | |
| 1712 delete this; | |
| 1713 } | |
| 1714 | |
| 1715 | |
| 1716 static void ensure_join(JavaThread* thread) { | |
| 1717 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1718 Handle threadObj(thread, thread->threadObj()); | |
| 1719 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1720 ObjectLocker lock(threadObj, thread); | |
| 1721 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1722 thread->clear_pending_exception(); | |
| 1723 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1724 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1725 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1726 // to complete once we've done the notify_all below |
| 0 | 1727 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1728 lock.notify_all(thread); | |
| 1729 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1730 thread->clear_pending_exception(); | |
| 1731 } | |
| 1732 | |
|
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1733 |
| 0 | 1734 // For any new cleanup additions, please check to see if they need to be applied to |
| 1735 // cleanup_failed_attach_current_thread as well. | |
| 1736 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1737 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1738 | |
| 1739 HandleMark hm(this); | |
| 1740 Handle uncaught_exception(this, this->pending_exception()); | |
| 1741 this->clear_pending_exception(); | |
| 1742 Handle threadObj(this, this->threadObj()); | |
| 1743 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1744 | |
| 1745 if (get_thread_profiler() != NULL) { | |
| 1746 get_thread_profiler()->disengage(); | |
| 1747 ResourceMark rm; | |
| 1748 get_thread_profiler()->print(get_thread_name()); | |
| 1749 } | |
| 1750 | |
| 1751 | |
| 1752 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1753 { | |
| 1754 EXCEPTION_MARK; | |
| 1755 | |
| 1756 CLEAR_PENDING_EXCEPTION; | |
| 1757 } | |
| 1758 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1759 // has to be fixed by a runtime query method | |
| 1760 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1761 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1762 // java.lang.Thread.dispatchUncaughtException | |
| 1763 if (uncaught_exception.not_null()) { | |
| 1764 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1765 { | |
| 1766 EXCEPTION_MARK; | |
| 1767 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1768 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1769 // so call ThreadGroup.uncaughtException() | |
| 1770 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1771 CallInfo callinfo; | |
| 1142 | 1772 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1773 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1774 vmSymbols::dispatchUncaughtException_name(), |
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1775 vmSymbols::throwable_void_signature(), |
| 0 | 1776 KlassHandle(), false, false, THREAD); |
| 1777 CLEAR_PENDING_EXCEPTION; | |
| 1778 methodHandle method = callinfo.selected_method(); | |
| 1779 if (method.not_null()) { | |
| 1780 JavaValue result(T_VOID); | |
| 1781 JavaCalls::call_virtual(&result, | |
| 1782 threadObj, thread_klass, | |
|
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1783 vmSymbols::dispatchUncaughtException_name(), |
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1784 vmSymbols::throwable_void_signature(), |
| 0 | 1785 uncaught_exception, |
| 1786 THREAD); | |
| 1787 } else { | |
| 1142 | 1788 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1789 JavaValue result(T_VOID); |
| 1790 JavaCalls::call_virtual(&result, | |
| 1791 group, thread_group, | |
|
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1792 vmSymbols::uncaughtException_name(), |
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1793 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1794 threadObj, // Arg 1 |
| 1795 uncaught_exception, // Arg 2 | |
| 1796 THREAD); | |
| 1797 } | |
|
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1798 if (HAS_PENDING_EXCEPTION) { |
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1799 ResourceMark rm(this); |
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1800 jio_fprintf(defaultStream::error_stream(), |
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1801 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1802 " in thread \"%s\"\n", |
| 6983 | 1803 pending_exception()->klass()->external_name(), |
|
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1804 get_thread_name()); |
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1805 CLEAR_PENDING_EXCEPTION; |
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1806 } |
| 0 | 1807 } |
| 1808 } | |
| 1809 | |
|
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1810 // Called before the java thread exit since we want to read info |
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1811 // from java_lang_Thread object |
| 10405 | 1812 EventThreadEnd event; |
| 1813 if (event.should_commit()) { | |
| 1814 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1815 event.commit(); | |
| 1816 } | |
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1817 |
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1818 // Call after last event on thread |
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1819 EVENT_THREAD_EXIT(this); |
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1820 |
| 0 | 1821 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1822 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1823 // is deprecated anyhow. | |
|
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1824 if (!is_Compiler_thread()) { |
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1825 int count = 3; |
| 0 | 1826 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
| 1827 EXCEPTION_MARK; | |
| 1828 JavaValue result(T_VOID); | |
| 1142 | 1829 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1830 JavaCalls::call_virtual(&result, |
| 1831 threadObj, thread_klass, | |
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1832 vmSymbols::exit_method_name(), |
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1833 vmSymbols::void_method_signature(), |
| 0 | 1834 THREAD); |
| 1835 CLEAR_PENDING_EXCEPTION; | |
| 1836 } | |
| 1837 } | |
| 1838 // notify JVMTI | |
| 1839 if (JvmtiExport::should_post_thread_life()) { | |
| 1840 JvmtiExport::post_thread_end(this); | |
| 1841 } | |
| 1842 | |
| 1843 // We have notified the agents that we are exiting, before we go on, | |
| 1844 // we must check for a pending external suspend request and honor it | |
| 1845 // in order to not surprise the thread that made the suspend request. | |
| 1846 while (true) { | |
| 1847 { | |
| 1848 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1849 if (!is_external_suspend()) { | |
| 1850 set_terminated(_thread_exiting); | |
| 1851 ThreadService::current_thread_exiting(this); | |
| 1852 break; | |
| 1853 } | |
| 1854 // Implied else: | |
| 1855 // Things get a little tricky here. We have a pending external | |
| 1856 // suspend request, but we are holding the SR_lock so we | |
| 1857 // can't just self-suspend. So we temporarily drop the lock | |
| 1858 // and then self-suspend. | |
| 1859 } | |
| 1860 | |
| 1861 ThreadBlockInVM tbivm(this); | |
| 1862 java_suspend_self(); | |
| 1863 | |
| 1864 // We're done with this suspend request, but we have to loop around | |
| 1865 // and check again. Eventually we will get SR_lock without a pending | |
| 1866 // external suspend request and will be able to mark ourselves as | |
| 1867 // exiting. | |
| 1868 } | |
| 1869 // no more external suspends are allowed at this point | |
| 1870 } else { | |
| 1871 // before_exit() has already posted JVMTI THREAD_END events | |
| 1872 } | |
| 1873 | |
| 1874 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1875 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1876 // group should have the destroyed bit set before waiters are notified). | |
| 1877 ensure_join(this); | |
| 1878 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1879 | |
| 1880 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1881 // held by this thread must be released. A detach operation must only | |
| 1882 // get here if there are no Java frames on the stack. Therefore, any | |
| 1883 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1884 // pre-inflated and in the monitor cache. | |
| 1885 // | |
| 1886 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1887 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1888 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1889 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1890 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1891 } | |
| 1892 | |
| 1893 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1894 // is in a consistent state, in case GC happens | |
| 1895 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1896 | |
| 1897 if (active_handles() != NULL) { | |
| 1898 JNIHandleBlock* block = active_handles(); | |
| 1899 set_active_handles(NULL); | |
| 1900 JNIHandleBlock::release_block(block); | |
| 1901 } | |
| 1902 | |
| 1903 if (free_handle_block() != NULL) { | |
| 1904 JNIHandleBlock* block = free_handle_block(); | |
| 1905 set_free_handle_block(NULL); | |
| 1906 JNIHandleBlock::release_block(block); | |
| 1907 } | |
| 1908 | |
| 1909 // These have to be removed while this is still a valid thread. | |
| 1910 remove_stack_guard_pages(); | |
| 1911 | |
| 1912 if (UseTLAB) { | |
| 1913 tlab().make_parsable(true); // retire TLAB | |
| 1914 } | |
| 1915 | |
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1916 if (JvmtiEnv::environments_might_exist()) { |
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1917 JvmtiExport::cleanup_thread(this); |
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1918 } |
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1919 |
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1920 // We must flush any deferred card marks before removing a thread from |
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1921 // the list of active threads. |
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1922 Universe::heap()->flush_deferred_store_barrier(this); |
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1923 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1924 |
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1925 #if INCLUDE_ALL_GCS |
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1926 // We must flush the G1-related buffers before removing a thread |
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1927 // from the list of active threads. We must do this after any deferred |
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1928 // card marks have been flushed (above) so that any entries that are |
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1929 // added to the thread's dirty card queue as a result are not lost. |
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1930 if (UseG1GC) { |
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1931 flush_barrier_queues(); |
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1932 } |
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1933 #endif // INCLUDE_ALL_GCS |
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1934 |
| 0 | 1935 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1936 Threads::remove(this); | |
| 1937 } | |
| 1938 | |
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1939 #if INCLUDE_ALL_GCS |
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1940 // Flush G1-related queues. |
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1941 void JavaThread::flush_barrier_queues() { |
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1942 satb_mark_queue().flush(); |
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1943 dirty_card_queue().flush(); |
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1944 } |
|
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1945 |
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1946 void JavaThread::initialize_queues() { |
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1947 assert(!SafepointSynchronize::is_at_safepoint(), |
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1948 "we should not be at a safepoint"); |
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1949 |
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1950 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1951 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1952 // The SATB queue should have been constructed with its active |
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1953 // field set to false. |
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1954 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1955 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1956 // If we are creating the thread during a marking cycle, we should |
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1957 // set the active field of the SATB queue to true. |
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1958 if (satb_queue_set.is_active()) { |
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1959 satb_queue.set_active(true); |
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1960 } |
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1961 |
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1962 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1963 // The dirty card queue should have been constructed with its |
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1964 // active field set to true. |
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1965 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1966 } |
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1967 #endif // INCLUDE_ALL_GCS |
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1968 |
| 0 | 1969 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1970 if (get_thread_profiler() != NULL) { |
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1971 get_thread_profiler()->disengage(); |
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1972 ResourceMark rm; |
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1973 get_thread_profiler()->print(get_thread_name()); |
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1974 } |
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1975 |
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1976 if (active_handles() != NULL) { |
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1977 JNIHandleBlock* block = active_handles(); |
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1978 set_active_handles(NULL); |
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1979 JNIHandleBlock::release_block(block); |
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1980 } |
|
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1981 |
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1982 if (free_handle_block() != NULL) { |
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1983 JNIHandleBlock* block = free_handle_block(); |
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1984 set_free_handle_block(NULL); |
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1985 JNIHandleBlock::release_block(block); |
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1986 } |
|
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1987 |
|
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1988 // These have to be removed while this is still a valid thread. |
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1989 remove_stack_guard_pages(); |
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1990 |
|
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1991 if (UseTLAB) { |
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1992 tlab().make_parsable(true); // retire TLAB, if any |
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1993 } |
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1994 |
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1995 #if INCLUDE_ALL_GCS |
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1996 if (UseG1GC) { |
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1997 flush_barrier_queues(); |
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1998 } |
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1999 #endif // INCLUDE_ALL_GCS |
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2000 |
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2001 Threads::remove(this); |
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2002 delete this; |
| 0 | 2003 } |
| 2004 | |
| 2005 | |
|
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2006 |
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2007 |
| 0 | 2008 JavaThread* JavaThread::active() { |
| 2009 Thread* thread = ThreadLocalStorage::thread(); | |
| 2010 assert(thread != NULL, "just checking"); | |
| 2011 if (thread->is_Java_thread()) { | |
| 2012 return (JavaThread*) thread; | |
| 2013 } else { | |
| 2014 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 2015 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 2016 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 2017 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 2018 return ret; | |
| 2019 } | |
| 2020 } | |
| 2021 | |
| 2022 bool JavaThread::is_lock_owned(address adr) const { | |
|
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2023 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 2024 |
| 2025 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2026 if (chunk->contains(adr)) return true; | |
| 2027 } | |
| 2028 | |
| 2029 return false; | |
| 2030 } | |
| 2031 | |
| 2032 | |
| 2033 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 2034 chunk->set_next(monitor_chunks()); | |
| 2035 set_monitor_chunks(chunk); | |
| 2036 } | |
| 2037 | |
| 2038 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 2039 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 2040 if (monitor_chunks() == chunk) { | |
| 2041 set_monitor_chunks(chunk->next()); | |
| 2042 } else { | |
| 2043 MonitorChunk* prev = monitor_chunks(); | |
| 2044 while (prev->next() != chunk) prev = prev->next(); | |
| 2045 prev->set_next(chunk->next()); | |
| 2046 } | |
| 2047 } | |
| 2048 | |
| 2049 // JVM support. | |
| 2050 | |
| 2051 // Note: this function shouldn't block if it's called in | |
| 2052 // _thread_in_native_trans state (such as from | |
| 2053 // check_special_condition_for_native_trans()). | |
| 2054 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 2055 | |
| 2056 if (has_last_Java_frame() && has_async_condition()) { | |
| 2057 // If we are at a polling page safepoint (not a poll return) | |
| 2058 // then we must defer async exception because live registers | |
| 2059 // will be clobbered by the exception path. Poll return is | |
| 2060 // ok because the call we a returning from already collides | |
| 2061 // with exception handling registers and so there is no issue. | |
| 2062 // (The exception handling path kills call result registers but | |
| 2063 // this is ok since the exception kills the result anyway). | |
| 2064 | |
| 2065 if (is_at_poll_safepoint()) { | |
| 2066 // if the code we are returning to has deoptimized we must defer | |
| 2067 // the exception otherwise live registers get clobbered on the | |
| 2068 // exception path before deoptimization is able to retrieve them. | |
| 2069 // | |
| 2070 RegisterMap map(this, false); | |
| 2071 frame caller_fr = last_frame().sender(&map); | |
| 2072 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 2073 if (caller_fr.is_deoptimized_frame()) { | |
| 2074 if (TraceExceptions) { | |
| 2075 ResourceMark rm; | |
| 2076 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 2077 } | |
| 2078 return; | |
| 2079 } | |
| 2080 } | |
| 2081 } | |
| 2082 | |
| 2083 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 2084 if (condition == _no_async_condition) { | |
| 2085 // Conditions have changed since has_special_runtime_exit_condition() | |
| 2086 // was called: | |
| 2087 // - if we were here only because of an external suspend request, | |
| 2088 // then that was taken care of above (or cancelled) so we are done | |
| 2089 // - if we were here because of another async request, then it has | |
| 2090 // been cleared between the has_special_runtime_exit_condition() | |
| 2091 // and now so again we are done | |
| 2092 return; | |
| 2093 } | |
| 2094 | |
| 2095 // Check for pending async. exception | |
| 2096 if (_pending_async_exception != NULL) { | |
| 2097 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2098 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2099 |
| 2100 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2101 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2102 | |
| 2103 if (TraceExceptions) { | |
| 2104 ResourceMark rm; | |
| 2105 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2106 if (has_last_Java_frame() ) { | |
| 2107 frame f = last_frame(); | |
| 2108 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2109 } | |
|
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2110 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2111 } |
| 2112 _pending_async_exception = NULL; | |
| 2113 clear_has_async_exception(); | |
| 2114 } | |
| 2115 } | |
| 2116 | |
| 2117 if (check_unsafe_error && | |
| 2118 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2119 condition = _no_async_condition; // done | |
| 2120 switch (thread_state()) { | |
| 2121 case _thread_in_vm: | |
| 2122 { | |
| 2123 JavaThread* THREAD = this; | |
| 2124 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2125 } | |
| 2126 case _thread_in_native: | |
| 2127 { | |
| 2128 ThreadInVMfromNative tiv(this); | |
| 2129 JavaThread* THREAD = this; | |
| 2130 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2131 } | |
| 2132 case _thread_in_Java: | |
| 2133 { | |
| 2134 ThreadInVMfromJava tiv(this); | |
| 2135 JavaThread* THREAD = this; | |
| 2136 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2137 } | |
| 2138 default: | |
| 2139 ShouldNotReachHere(); | |
| 2140 } | |
| 2141 } | |
| 2142 | |
| 2143 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2144 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2145 "must have handled the async condition, if no exception"); | |
| 2146 } | |
| 2147 | |
| 2148 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2149 // | |
| 2150 // Check for pending external suspend. Internal suspend requests do | |
| 2151 // not use handle_special_runtime_exit_condition(). | |
| 2152 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2153 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2154 // threads could call into the VM with another thread's JNIEnv so we | |
| 2155 // can be here operating on behalf of a suspended thread (4432884). | |
| 2156 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2157 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2158 // | |
| 2159 // Because thread is external suspended the safepoint code will count | |
| 2160 // thread as at a safepoint. This can be odd because we can be here | |
| 2161 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2162 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2163 // before calling java_suspend_self like all other callers of it but | |
| 2164 // we must then observe proper safepoint protocol. (We can't leave | |
| 2165 // _thread_blocked with a safepoint in progress). However we can be | |
| 2166 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2167 // constructor/destructor pair because they assert on that type of | |
| 2168 // transition. We could do something like: | |
| 2169 // | |
| 2170 // JavaThreadState state = thread_state(); | |
| 2171 // set_thread_state(_thread_in_vm); | |
| 2172 // { | |
| 2173 // ThreadBlockInVM tbivm(this); | |
| 2174 // java_suspend_self() | |
| 2175 // } | |
| 2176 // set_thread_state(_thread_in_vm_trans); | |
| 2177 // if (safepoint) block; | |
| 2178 // set_thread_state(state); | |
| 2179 // | |
| 2180 // but that is pretty messy. Instead we just go with the way the | |
| 2181 // code has worked before and note that this is the only path to | |
| 2182 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2183 // mode. | |
| 2184 | |
| 2185 frame_anchor()->make_walkable(this); | |
| 2186 java_suspend_self(); | |
| 2187 | |
| 2188 // We might be here for reasons in addition to the self-suspend request | |
| 2189 // so check for other async requests. | |
| 2190 } | |
| 2191 | |
| 2192 if (check_asyncs) { | |
| 2193 check_and_handle_async_exceptions(); | |
| 2194 } | |
| 2195 } | |
| 2196 | |
| 2197 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2198 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2199 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2200 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2201 | |
| 2202 // Do not throw asynchronous exceptions against the compiler thread | |
| 2203 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2204 if (is_Compiler_thread()) return; | |
| 2205 | |
| 2206 { | |
| 2207 // Actually throw the Throwable against the target Thread - however | |
| 2208 // only if there is no thread death exception installed already. | |
| 1142 | 2209 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2210 // If the topmost frame is a runtime stub, then we are calling into |
| 2211 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2212 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2213 // may not be valid | |
| 2214 if (has_last_Java_frame()) { | |
| 2215 frame f = last_frame(); | |
| 2216 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2217 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2218 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2219 frame compiled_frame = f.sender(®_map); | |
|
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2220 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
| 0 | 2221 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
| 2222 } | |
| 2223 } | |
| 2224 } | |
| 2225 | |
| 2226 // Set async. pending exception in thread. | |
| 2227 set_pending_async_exception(java_throwable); | |
| 2228 | |
| 2229 if (TraceExceptions) { | |
| 2230 ResourceMark rm; | |
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2231 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2232 } |
| 2233 // for AbortVMOnException flag | |
|
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2234 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2235 } |
| 2236 } | |
| 2237 | |
| 2238 | |
| 2239 // Interrupt thread so it will wake up from a potential wait() | |
| 2240 Thread::interrupt(this); | |
| 2241 } | |
| 2242 | |
| 2243 // External suspension mechanism. | |
| 2244 // | |
| 2245 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2246 // to any VM_locks and it is at a transition | |
| 2247 // Self-suspension will happen on the transition out of the vm. | |
| 2248 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2249 // | |
| 2250 // Guarantees on return: | |
| 2251 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2252 // force a safepoint) | |
| 2253 // + Target thread will not enter any new monitors | |
| 2254 // | |
| 2255 void JavaThread::java_suspend() { | |
| 2256 { MutexLocker mu(Threads_lock); | |
| 2257 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2258 return; | |
| 2259 } | |
| 2260 } | |
| 2261 | |
| 2262 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2263 if (!is_external_suspend()) { | |
| 2264 // a racing resume has cancelled us; bail out now | |
| 2265 return; | |
| 2266 } | |
| 2267 | |
| 2268 // suspend is done | |
| 2269 uint32_t debug_bits = 0; | |
| 2270 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2271 // SR_lock to allow the thread to reach a stable thread state if | |
| 2272 // it is currently in a transient thread state. | |
| 2273 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2274 SuspendRetryDelay, &debug_bits) ) { | |
| 2275 return; | |
| 2276 } | |
| 2277 } | |
| 2278 | |
| 2279 VM_ForceSafepoint vm_suspend; | |
| 2280 VMThread::execute(&vm_suspend); | |
| 2281 } | |
| 2282 | |
| 2283 // Part II of external suspension. | |
| 2284 // A JavaThread self suspends when it detects a pending external suspend | |
| 2285 // request. This is usually on transitions. It is also done in places | |
| 2286 // where continuing to the next transition would surprise the caller, | |
| 2287 // e.g., monitor entry. | |
| 2288 // | |
| 2289 // Returns the number of times that the thread self-suspended. | |
| 2290 // | |
| 2291 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2292 // thread. java_suspend_self() is the second stage of cooperative | |
| 2293 // suspension for external suspend requests and should only be used | |
| 2294 // to complete an external suspend request. | |
| 2295 // | |
| 2296 int JavaThread::java_suspend_self() { | |
| 2297 int ret = 0; | |
| 2298 | |
| 2299 // we are in the process of exiting so don't suspend | |
| 2300 if (is_exiting()) { | |
| 2301 clear_external_suspend(); | |
| 2302 return ret; | |
| 2303 } | |
| 2304 | |
| 2305 assert(_anchor.walkable() || | |
| 2306 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2307 "must have walkable stack"); | |
| 2308 | |
| 2309 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2310 | |
| 979 | 2311 assert(!this->is_ext_suspended(), |
| 0 | 2312 "a thread trying to self-suspend should not already be suspended"); |
| 2313 | |
| 2314 if (this->is_suspend_equivalent()) { | |
| 2315 // If we are self-suspending as a result of the lifting of a | |
| 2316 // suspend equivalent condition, then the suspend_equivalent | |
| 2317 // flag is not cleared until we set the ext_suspended flag so | |
| 2318 // that wait_for_ext_suspend_completion() returns consistent | |
| 2319 // results. | |
| 2320 this->clear_suspend_equivalent(); | |
| 2321 } | |
| 2322 | |
| 2323 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2324 // above. Or another external suspend request could be waiting for us | |
| 2325 // by the time we return from SR_lock()->wait(). The thread | |
| 2326 // that requested the suspension may already be trying to walk our | |
| 2327 // stack and if we return now, we can change the stack out from under | |
| 2328 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2329 // to crash. We stay self-suspended until there are no more pending | |
| 2330 // external suspend requests. | |
| 2331 while (is_external_suspend()) { | |
| 2332 ret++; | |
| 2333 this->set_ext_suspended(); | |
| 2334 | |
| 2335 // _ext_suspended flag is cleared by java_resume() | |
| 2336 while (is_ext_suspended()) { | |
| 2337 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2338 } | |
| 2339 } | |
| 2340 | |
| 2341 return ret; | |
| 2342 } | |
| 2343 | |
| 2344 #ifdef ASSERT | |
| 2345 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2346 // hence doesn't need protection from concurrent access at this stage | |
| 2347 void JavaThread::verify_not_published() { | |
| 2348 if (!Threads_lock->owned_by_self()) { | |
| 2349 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2350 assert( !Threads::includes(this), | |
| 2351 "java thread shouldn't have been published yet!"); | |
| 2352 } | |
| 2353 else { | |
| 2354 assert( !Threads::includes(this), | |
| 2355 "java thread shouldn't have been published yet!"); | |
| 2356 } | |
| 2357 } | |
| 2358 #endif | |
| 2359 | |
| 2360 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2361 // progress or when _suspend_flags is non-zero. | |
| 2362 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2363 // block if a safepoint is in progress. | |
| 2364 // Async exception ISN'T checked. | |
| 2365 // Note only the ThreadInVMfromNative transition can call this function | |
| 2366 // directly and when thread state is _thread_in_native_trans | |
| 2367 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2368 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2369 | |
| 2370 JavaThread *curJT = JavaThread::current(); | |
| 2371 bool do_self_suspend = thread->is_external_suspend(); | |
| 2372 | |
| 2373 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2374 | |
| 2375 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2376 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2377 // threads could call into the VM with another thread's JNIEnv so we | |
| 2378 // can be here operating on behalf of a suspended thread (4432884). | |
| 2379 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2380 JavaThreadState state = thread->thread_state(); | |
| 2381 | |
| 2382 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2383 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2384 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2385 thread->set_suspend_equivalent(); | |
| 2386 | |
| 2387 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2388 // wait until the thread changes to other thread state. There is no | |
| 2389 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2390 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2391 // too long. Temporarily change the state to _thread_blocked to | |
| 2392 // let the VM thread know that this thread is ready for GC. The problem | |
| 2393 // of changing thread state is that safepoint could happen just after | |
| 2394 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2395 // see the _thread_blocked state. We must check for safepoint | |
| 2396 // after restoring the state and make sure we won't leave while a safepoint | |
| 2397 // is in progress. | |
| 2398 thread->set_thread_state(_thread_blocked); | |
| 2399 thread->java_suspend_self(); | |
| 2400 thread->set_thread_state(state); | |
| 2401 // Make sure new state is seen by VM thread | |
| 2402 if (os::is_MP()) { | |
| 2403 if (UseMembar) { | |
| 2404 // Force a fence between the write above and read below | |
| 2405 OrderAccess::fence(); | |
| 2406 } else { | |
| 2407 // Must use this rather than serialization page in particular on Windows | |
| 2408 InterfaceSupport::serialize_memory(thread); | |
| 2409 } | |
| 2410 } | |
| 2411 } | |
| 2412 | |
| 2413 if (SafepointSynchronize::do_call_back()) { | |
| 2414 // If we are safepointing, then block the caller which may not be | |
| 2415 // the same as the target thread (see above). | |
| 2416 SafepointSynchronize::block(curJT); | |
| 2417 } | |
| 2418 | |
| 2419 if (thread->is_deopt_suspend()) { | |
| 2420 thread->clear_deopt_suspend(); | |
| 2421 RegisterMap map(thread, false); | |
| 2422 frame f = thread->last_frame(); | |
| 2423 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2424 f = f.sender(&map); | |
| 2425 } | |
| 2426 if (f.id() == thread->must_deopt_id()) { | |
| 2427 thread->clear_must_deopt_id(); | |
|
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2428 f.deoptimize(thread); |
| 0 | 2429 } else { |
| 2430 fatal("missed deoptimization!"); | |
| 2431 } | |
| 2432 } | |
| 2433 } | |
| 2434 | |
| 2435 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2436 // progress or when _suspend_flags is non-zero. | |
| 2437 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2438 // block if a safepoint is in progress. | |
| 2439 // Also check for pending async exception (not including unsafe access error). | |
| 2440 // Note only the native==>VM/Java barriers can call this function and when | |
| 2441 // thread state is _thread_in_native_trans. | |
| 2442 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2443 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2444 | |
| 2445 if (thread->has_async_exception()) { | |
| 2446 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2447 // access error since that may block. | |
| 2448 thread->check_and_handle_async_exceptions(false); | |
| 2449 } | |
| 2450 } | |
| 2451 | |
|
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2452 // This is a variant of the normal |
|
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2453 // check_special_condition_for_native_trans with slightly different |
|
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2454 // semantics for use by critical native wrappers. It does all the |
|
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2455 // normal checks but also performs the transition back into |
|
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2456 // thread_in_Java state. This is required so that critical natives |
|
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2457 // can potentially block and perform a GC if they are the last thread |
|
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2458 // exiting the GC_locker. |
|
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2459 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
|
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2460 check_special_condition_for_native_trans(thread); |
|
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2461 |
|
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2462 // Finish the transition |
|
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2463 thread->set_thread_state(_thread_in_Java); |
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2464 |
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2465 if (thread->do_critical_native_unlock()) { |
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2466 ThreadInVMfromJavaNoAsyncException tiv(thread); |
|
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2467 GC_locker::unlock_critical(thread); |
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2468 thread->clear_critical_native_unlock(); |
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2469 } |
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2470 } |
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2471 |
| 0 | 2472 // We need to guarantee the Threads_lock here, since resumes are not |
| 2473 // allowed during safepoint synchronization | |
| 2474 // Can only resume from an external suspension | |
| 2475 void JavaThread::java_resume() { | |
| 2476 assert_locked_or_safepoint(Threads_lock); | |
| 2477 | |
| 2478 // Sanity check: thread is gone, has started exiting or the thread | |
| 2479 // was not externally suspended. | |
| 2480 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2481 return; | |
| 2482 } | |
| 2483 | |
| 2484 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2485 | |
| 2486 clear_external_suspend(); | |
| 2487 | |
| 2488 if (is_ext_suspended()) { | |
| 2489 clear_ext_suspended(); | |
| 2490 SR_lock()->notify_all(); | |
| 2491 } | |
| 2492 } | |
| 2493 | |
| 2494 void JavaThread::create_stack_guard_pages() { | |
| 2495 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2496 address low_addr = stack_base() - stack_size(); | |
| 2497 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2498 | |
| 2499 int allocate = os::allocate_stack_guard_pages(); | |
| 2500 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2501 | |
|
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2502 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2503 warning("Attempt to allocate stack guard pages failed."); |
| 2504 return; | |
| 2505 } | |
| 2506 | |
| 2507 if (os::guard_memory((char *) low_addr, len)) { | |
| 2508 _stack_guard_state = stack_guard_enabled; | |
| 2509 } else { | |
| 2510 warning("Attempt to protect stack guard pages failed."); | |
| 2511 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2512 warning("Attempt to deallocate stack guard pages failed."); | |
| 2513 } | |
| 2514 } | |
| 2515 } | |
| 2516 | |
| 2517 void JavaThread::remove_stack_guard_pages() { | |
|
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|
2518 assert(Thread::current() == this, "from different thread"); |
| 0 | 2519 if (_stack_guard_state == stack_guard_unused) return; |
| 2520 address low_addr = stack_base() - stack_size(); | |
| 2521 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2522 | |
| 2523 if (os::allocate_stack_guard_pages()) { | |
|
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2524 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2525 _stack_guard_state = stack_guard_unused; |
| 2526 } else { | |
| 2527 warning("Attempt to deallocate stack guard pages failed."); | |
| 2528 } | |
| 2529 } else { | |
| 2530 if (_stack_guard_state == stack_guard_unused) return; | |
| 2531 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2532 _stack_guard_state = stack_guard_unused; | |
| 2533 } else { | |
| 2534 warning("Attempt to unprotect stack guard pages failed."); | |
| 2535 } | |
| 2536 } | |
| 2537 } | |
| 2538 | |
| 2539 void JavaThread::enable_stack_yellow_zone() { | |
| 2540 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2541 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2542 | |
| 2543 // The base notation is from the stacks point of view, growing downward. | |
| 2544 // We need to adjust it to work correctly with guard_memory() | |
| 2545 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2546 | |
| 2547 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2548 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2549 | |
| 2550 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2551 _stack_guard_state = stack_guard_enabled; | |
| 2552 } else { | |
| 2553 warning("Attempt to guard stack yellow zone failed."); | |
| 2554 } | |
| 2555 enable_register_stack_guard(); | |
| 2556 } | |
| 2557 | |
| 2558 void JavaThread::disable_stack_yellow_zone() { | |
| 2559 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2560 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2561 | |
| 2562 // Simply return if called for a thread that does not use guard pages. | |
| 2563 if (_stack_guard_state == stack_guard_unused) return; | |
| 2564 | |
| 2565 // The base notation is from the stacks point of view, growing downward. | |
| 2566 // We need to adjust it to work correctly with guard_memory() | |
| 2567 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2568 | |
| 2569 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2570 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2571 } else { | |
| 2572 warning("Attempt to unguard stack yellow zone failed."); | |
| 2573 } | |
| 2574 disable_register_stack_guard(); | |
| 2575 } | |
| 2576 | |
| 2577 void JavaThread::enable_stack_red_zone() { | |
| 2578 // The base notation is from the stacks point of view, growing downward. | |
| 2579 // We need to adjust it to work correctly with guard_memory() | |
| 2580 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2581 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2582 | |
| 2583 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2584 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2585 | |
| 2586 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2587 warning("Attempt to guard stack red zone failed."); | |
| 2588 } | |
| 2589 } | |
| 2590 | |
| 2591 void JavaThread::disable_stack_red_zone() { | |
| 2592 // The base notation is from the stacks point of view, growing downward. | |
| 2593 // We need to adjust it to work correctly with guard_memory() | |
| 2594 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2595 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2596 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2597 warning("Attempt to unguard stack red zone failed."); | |
| 2598 } | |
| 2599 } | |
| 2600 | |
| 2601 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2602 // ignore is there is no stack | |
| 2603 if (!has_last_Java_frame()) return; | |
| 2604 // traverse the stack frames. Starts from top frame. | |
| 2605 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2606 frame* fr = fst.current(); | |
| 2607 f(fr, fst.register_map()); | |
| 2608 } | |
| 2609 } | |
| 2610 | |
| 2611 | |
| 2612 #ifndef PRODUCT | |
| 2613 // Deoptimization | |
| 2614 // Function for testing deoptimization | |
| 2615 void JavaThread::deoptimize() { | |
| 2616 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2617 StackFrameStream fst(this, UseBiasedLocking); | |
| 2618 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2619 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2620 // Iterate over all frames in the thread and deoptimize | |
| 2621 for(; !fst.is_done(); fst.next()) { | |
| 2622 if(fst.current()->can_be_deoptimized()) { | |
| 2623 | |
| 2624 if (only_at) { | |
| 2625 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2626 // consists of comma or carriage return separated numbers so | |
| 2627 // search for the current bci in that string. | |
| 2628 address pc = fst.current()->pc(); | |
| 2629 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2630 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2631 char buffer[8]; | |
| 2632 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2633 size_t len = strlen(buffer); | |
| 2634 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2635 while (found != NULL) { | |
| 2636 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2637 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2638 // Check that the bci found is bracketed by terminators. | |
| 2639 break; | |
| 2640 } | |
| 2641 found = strstr(found + 1, buffer); | |
| 2642 } | |
| 2643 if (!found) { | |
| 2644 continue; | |
| 2645 } | |
| 2646 } | |
| 2647 | |
| 2648 if (DebugDeoptimization && !deopt) { | |
| 2649 deopt = true; // One-time only print before deopt | |
| 2650 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2651 trace_frames(); | |
| 2652 trace_stack(); | |
| 2653 } | |
| 2654 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2655 } | |
| 2656 } | |
| 2657 | |
| 2658 if (DebugDeoptimization && deopt) { | |
| 2659 tty->print_cr("[AFTER Deoptimization]"); | |
| 2660 trace_frames(); | |
| 2661 } | |
| 2662 } | |
| 2663 | |
| 2664 | |
| 2665 // Make zombies | |
| 2666 void JavaThread::make_zombies() { | |
| 2667 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2668 if (fst.current()->can_be_deoptimized()) { | |
| 2669 // it is a Java nmethod | |
| 2670 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2671 nm->make_not_entrant(); | |
| 2672 } | |
| 2673 } | |
| 2674 } | |
| 2675 #endif // PRODUCT | |
| 2676 | |
| 2677 | |
| 2678 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2679 if (!has_last_Java_frame()) return; | |
| 2680 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2681 StackFrameStream fst(this, UseBiasedLocking); | |
| 2682 for(; !fst.is_done(); fst.next()) { | |
| 2683 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2684 if (LogCompilation && xtty != NULL) { |
| 2685 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2686 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2687 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2688 } | |
| 2689 | |
| 0 | 2690 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2691 } | |
| 2692 } | |
| 2693 } | |
| 2694 | |
| 2695 | |
| 2696 // GC support | |
| 2697 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2698 | |
| 2699 void JavaThread::gc_epilogue() { | |
| 2700 frames_do(frame_gc_epilogue); | |
| 2701 } | |
| 2702 | |
| 2703 | |
| 2704 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2705 | |
| 2706 void JavaThread::gc_prologue() { | |
| 2707 frames_do(frame_gc_prologue); | |
| 2708 } | |
| 2709 | |
|
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2710 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2711 // the given JavaThread in its _processed_thread field. |
|
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2712 class RememberProcessedThread: public StackObj { |
|
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2713 NamedThread* _cur_thr; |
|
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2714 public: |
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2715 RememberProcessedThread(JavaThread* jthr) { |
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2716 Thread* thread = Thread::current(); |
|
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2717 if (thread->is_Named_thread()) { |
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2718 _cur_thr = (NamedThread *)thread; |
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2719 _cur_thr->set_processed_thread(jthr); |
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2720 } else { |
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2721 _cur_thr = NULL; |
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2722 } |
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2723 } |
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2724 |
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2725 ~RememberProcessedThread() { |
|
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2726 if (_cur_thr) { |
|
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2727 _cur_thr->set_processed_thread(NULL); |
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2728 } |
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2729 } |
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2730 }; |
| 0 | 2731 |
|
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2732 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 1166 | 2733 // Verify that the deferred card marks have been flushed. |
| 2734 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2735 |
| 0 | 2736 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2737 // since there may be more than one thread using each ThreadProfiler. | |
| 2738 | |
| 2739 // Traverse the GCHandles | |
|
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2740 Thread::oops_do(f, cld_f, cf); |
| 0 | 2741 |
| 2742 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2743 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2744 | |
| 2745 if (has_last_Java_frame()) { | |
|
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2746 // Record JavaThread to GC thread |
|
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|
2747 RememberProcessedThread rpt(this); |
| 0 | 2748 |
| 2749 // Traverse the privileged stack | |
| 2750 if (_privileged_stack_top != NULL) { | |
| 2751 _privileged_stack_top->oops_do(f); | |
| 2752 } | |
| 2753 | |
| 2754 // traverse the registered growable array | |
| 2755 if (_array_for_gc != NULL) { | |
| 2756 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2757 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2758 } | |
| 2759 } | |
| 2760 | |
| 2761 // Traverse the monitor chunks | |
| 2762 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2763 chunk->oops_do(f); | |
| 2764 } | |
| 2765 | |
| 2766 // Traverse the execution stack | |
| 2767 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2768 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
| 0 | 2769 } |
| 2770 } | |
| 2771 | |
| 2772 // callee_target is never live across a gc point so NULL it here should | |
| 2773 // it still contain a methdOop. | |
| 2774 | |
| 2775 set_callee_target(NULL); | |
| 2776 | |
| 2777 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2778 // If we have deferred set_locals there might be oops waiting to be | |
| 2779 // written | |
| 2780 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2781 if (list != NULL) { | |
| 2782 for (int i = 0; i < list->length(); i++) { | |
| 2783 list->at(i)->oops_do(f); | |
| 2784 } | |
| 2785 } | |
| 2786 | |
| 2787 // Traverse instance variables at the end since the GC may be moving things | |
| 2788 // around using this function | |
| 2789 f->do_oop((oop*) &_threadObj); | |
| 2790 f->do_oop((oop*) &_vm_result); | |
| 2791 f->do_oop((oop*) &_exception_oop); | |
| 2792 f->do_oop((oop*) &_pending_async_exception); | |
| 2793 | |
| 2794 if (jvmti_thread_state() != NULL) { | |
| 2795 jvmti_thread_state()->oops_do(f); | |
| 2796 } | |
| 2797 } | |
| 2798 | |
|
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2799 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2800 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2801 |
| 2802 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2803 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2804 | |
| 2805 if (has_last_Java_frame()) { | |
| 2806 // Traverse the execution stack | |
| 2807 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2808 fst.current()->nmethods_do(cf); |
| 0 | 2809 } |
| 2810 } | |
| 2811 } | |
| 2812 | |
|
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2813 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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2814 Thread::metadata_do(f); |
|
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2815 if (has_last_Java_frame()) { |
|
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2816 // Traverse the execution stack to call f() on the methods in the stack |
|
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2817 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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2818 fst.current()->metadata_do(f); |
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2819 } |
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2820 } else if (is_Compiler_thread()) { |
|
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2821 // need to walk ciMetadata in current compile tasks to keep alive. |
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2822 CompilerThread* ct = (CompilerThread*)this; |
|
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2823 if (ct->env() != NULL) { |
|
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2824 ct->env()->metadata_do(f); |
|
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2825 } |
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2826 } |
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2827 } |
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|
2828 |
| 0 | 2829 // Printing |
| 2830 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2831 switch (_thread_state) { | |
| 2832 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2833 case _thread_new: return "_thread_new"; | |
| 2834 case _thread_new_trans: return "_thread_new_trans"; | |
| 2835 case _thread_in_native: return "_thread_in_native"; | |
| 2836 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2837 case _thread_in_vm: return "_thread_in_vm"; | |
| 2838 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2839 case _thread_in_Java: return "_thread_in_Java"; | |
| 2840 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2841 case _thread_blocked: return "_thread_blocked"; | |
| 2842 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2843 default: return "unknown thread state"; | |
| 2844 } | |
| 2845 } | |
| 2846 | |
| 2847 #ifndef PRODUCT | |
| 2848 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2849 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2850 }; | |
| 2851 void JavaThread::print_thread_state() const { | |
| 2852 print_thread_state_on(tty); | |
| 2853 }; | |
| 2854 #endif // PRODUCT | |
| 2855 | |
| 2856 // Called by Threads::print() for VM_PrintThreads operation | |
| 2857 void JavaThread::print_on(outputStream *st) const { | |
| 2858 st->print("\"%s\" ", get_thread_name()); | |
| 2859 oop thread_oop = threadObj(); | |
| 6766 | 2860 if (thread_oop != NULL) { |
| 2861 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2862 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2863 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2864 } | |
| 0 | 2865 Thread::print_on(st); |
| 2866 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2867 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2868 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2869 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2870 } | |
| 2871 #ifndef PRODUCT | |
| 2872 print_thread_state_on(st); | |
| 2873 _safepoint_state->print_on(st); | |
| 2874 #endif // PRODUCT | |
| 2875 } | |
| 2876 | |
| 2877 // Called by fatal error handler. The difference between this and | |
| 2878 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2879 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2880 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2881 oop thread_obj = threadObj(); | |
| 2882 if (thread_obj != NULL) { | |
| 2883 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2884 } | |
| 2885 st->print(" ["); | |
| 2886 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2887 if (osthread()) { | |
| 2888 st->print(", id=%d", osthread()->thread_id()); | |
| 2889 } | |
| 2890 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2891 _stack_base - _stack_size, _stack_base); | |
| 2892 st->print("]"); | |
| 2893 return; | |
| 2894 } | |
| 2895 | |
| 2896 // Verification | |
| 2897 | |
| 2898 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2899 | |
| 2900 void JavaThread::verify() { | |
| 2901 // Verify oops in the thread. | |
|
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2902 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
| 0 | 2903 |
| 2904 // Verify the stack frames. | |
| 2905 frames_do(frame_verify); | |
| 2906 } | |
| 2907 | |
| 2908 // CR 6300358 (sub-CR 2137150) | |
| 2909 // Most callers of this method assume that it can't return NULL but a | |
| 2910 // thread may not have a name whilst it is in the process of attaching to | |
| 2911 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2912 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2913 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2914 // for such that this method never returns NULL. | |
| 2915 const char* JavaThread::get_thread_name() const { | |
| 2916 #ifdef ASSERT | |
| 2917 // early safepoints can hit while current thread does not yet have TLS | |
| 2918 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2919 Thread *cur = Thread::current(); | |
| 2920 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2921 // Current JavaThreads are allowed to get their own name without | |
| 2922 // the Threads_lock. | |
| 2923 assert_locked_or_safepoint(Threads_lock); | |
| 2924 } | |
| 2925 } | |
| 2926 #endif // ASSERT | |
| 2927 return get_thread_name_string(); | |
| 2928 } | |
| 2929 | |
| 2930 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2931 // descriptive string if there is no set name | |
| 2932 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2933 const char* name_str; | |
| 2934 oop thread_obj = threadObj(); | |
| 2935 if (thread_obj != NULL) { | |
| 2936 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2937 if (name != NULL) { | |
| 2938 if (buf == NULL) { | |
| 2939 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2940 } | |
| 2941 else { | |
| 2942 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2943 } | |
| 2944 } | |
| 4006 | 2945 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2946 name_str = "<no-name - thread is attaching>"; |
| 2947 } | |
| 2948 else { | |
| 2949 name_str = Thread::name(); | |
| 2950 } | |
| 2951 } | |
| 2952 else { | |
| 2953 name_str = Thread::name(); | |
| 2954 } | |
| 2955 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2956 return name_str; | |
| 2957 } | |
| 2958 | |
| 2959 | |
| 2960 const char* JavaThread::get_threadgroup_name() const { | |
| 2961 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2962 oop thread_obj = threadObj(); | |
| 2963 if (thread_obj != NULL) { | |
| 2964 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2965 if (thread_group != NULL) { | |
| 2966 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2967 // ThreadGroup.name can be null | |
| 2968 if (name != NULL) { | |
| 2969 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2970 return str; | |
| 2971 } | |
| 2972 } | |
| 2973 } | |
| 2974 return NULL; | |
| 2975 } | |
| 2976 | |
| 2977 const char* JavaThread::get_parent_name() const { | |
| 2978 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2979 oop thread_obj = threadObj(); | |
| 2980 if (thread_obj != NULL) { | |
| 2981 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2982 if (thread_group != NULL) { | |
| 2983 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2984 if (parent != NULL) { | |
| 2985 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2986 // ThreadGroup.name can be null | |
| 2987 if (name != NULL) { | |
| 2988 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2989 return str; | |
| 2990 } | |
| 2991 } | |
| 2992 } | |
| 2993 } | |
| 2994 return NULL; | |
| 2995 } | |
| 2996 | |
| 2997 ThreadPriority JavaThread::java_priority() const { | |
| 2998 oop thr_oop = threadObj(); | |
| 2999 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 3000 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 3001 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 3002 return priority; | |
| 3003 } | |
| 3004 | |
| 3005 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 3006 | |
| 3007 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 3008 // Link Java Thread object <-> C++ Thread | |
| 3009 | |
| 3010 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 3011 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 3012 // be used to pass the C++ thread object to other methods. | |
| 3013 | |
| 3014 // Set the Java level thread object (jthread) field of the | |
| 3015 // new thread (a JavaThread *) to C++ thread object using the | |
| 3016 // "thread_oop" handle. | |
| 3017 | |
| 3018 // Set the thread field (a JavaThread *) of the | |
| 3019 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 3020 | |
| 3021 Handle thread_oop(Thread::current(), | |
| 3022 JNIHandles::resolve_non_null(jni_thread)); | |
|
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3023 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 3024 "must be initialized"); |
| 3025 set_threadObj(thread_oop()); | |
| 3026 java_lang_Thread::set_thread(thread_oop(), this); | |
| 3027 | |
| 3028 if (prio == NoPriority) { | |
| 3029 prio = java_lang_Thread::priority(thread_oop()); | |
| 3030 assert(prio != NoPriority, "A valid priority should be present"); | |
| 3031 } | |
| 3032 | |
| 3033 // Push the Java priority down to the native thread; needs Threads_lock | |
| 3034 Thread::set_priority(this, prio); | |
| 3035 | |
| 3036 // Add the new thread to the Threads list and set it in motion. | |
| 3037 // We must have threads lock in order to call Threads::add. | |
| 3038 // It is crucial that we do not block before the thread is | |
| 3039 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 3040 // will not be visited by GC. | |
| 3041 Threads::add(this); | |
| 3042 } | |
| 3043 | |
| 3044 oop JavaThread::current_park_blocker() { | |
| 3045 // Support for JSR-166 locks | |
| 3046 oop thread_oop = threadObj(); | |
| 242 | 3047 if (thread_oop != NULL && |
| 3048 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 3049 return java_lang_Thread::park_blocker(thread_oop); |
| 3050 } | |
| 3051 return NULL; | |
| 3052 } | |
| 3053 | |
| 3054 | |
| 3055 void JavaThread::print_stack_on(outputStream* st) { | |
| 3056 if (!has_last_Java_frame()) return; | |
| 3057 ResourceMark rm; | |
| 3058 HandleMark hm; | |
| 3059 | |
| 3060 RegisterMap reg_map(this); | |
| 3061 vframe* start_vf = last_java_vframe(®_map); | |
| 3062 int count = 0; | |
| 3063 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3064 if (f->is_java_frame()) { | |
| 3065 javaVFrame* jvf = javaVFrame::cast(f); | |
| 3066 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 3067 | |
| 3068 // Print out lock information | |
| 3069 if (JavaMonitorsInStackTrace) { | |
| 3070 jvf->print_lock_info_on(st, count); | |
| 3071 } | |
| 3072 } else { | |
| 3073 // Ignore non-Java frames | |
| 3074 } | |
| 3075 | |
| 3076 // Bail-out case for too deep stacks | |
| 3077 count++; | |
| 3078 if (MaxJavaStackTraceDepth == count) return; | |
| 3079 } | |
| 3080 } | |
| 3081 | |
| 3082 | |
| 3083 // JVMTI PopFrame support | |
| 3084 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 3085 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 3086 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 3087 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 3088 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
1603
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6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
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1584
diff
changeset
|
3089 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 3090 } |
| 3091 } | |
| 3092 | |
| 3093 void* JavaThread::popframe_preserved_args() { | |
| 3094 return _popframe_preserved_args; | |
| 3095 } | |
| 3096 | |
| 3097 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3098 return in_ByteSize(_popframe_preserved_args_size); | |
| 3099 } | |
| 3100 | |
| 3101 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3102 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3103 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3104 return in_WordSize(sz / wordSize); | |
| 3105 } | |
| 3106 | |
| 3107 void JavaThread::popframe_free_preserved_args() { | |
| 3108 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3109 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3110 _popframe_preserved_args = NULL; |
| 3111 _popframe_preserved_args_size = 0; | |
| 3112 } | |
| 3113 | |
| 3114 #ifndef PRODUCT | |
| 3115 | |
| 3116 void JavaThread::trace_frames() { | |
| 3117 tty->print_cr("[Describe stack]"); | |
| 3118 int frame_no = 1; | |
| 3119 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3120 tty->print(" %d. ", frame_no++); | |
| 3121 fst.current()->print_value_on(tty,this); | |
| 3122 tty->cr(); | |
| 3123 } | |
| 3124 } | |
| 3125 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3126 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3127 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3128 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3129 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3130 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3131 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3132 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3133 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3134 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3135 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3136 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3137 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3138 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3139 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3140 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3141 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3142 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3143 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3144 virtual void do_oop(oop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3145 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3146 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3147 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3148 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3149 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3150 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3151 f->print_value(); |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3152 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3153 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3154 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3155 // Print our all the locations that contain oops and whether they are |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3156 // valid or not. This useful when trying to find the oldest frame |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3157 // where an oop has gone bad since the frame walk is from youngest to |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3158 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3159 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3160 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3161 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3162 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3163 |
| 0 | 3164 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3165 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3166 // Print or validate the layout of stack frames |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3167 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3168 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3169 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3170 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3171 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3172 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3173 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3174 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3175 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3176 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3177 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3178 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3179 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3180 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3181 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3182 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3183 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
3184 |
| 0 | 3185 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3186 ResourceMark rm; | |
| 3187 int vframe_no = 1; | |
| 3188 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3189 if (f->is_java_frame()) { | |
| 3190 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3191 } else { | |
| 3192 f->print(); | |
| 3193 } | |
| 3194 if (vframe_no > StackPrintLimit) { | |
| 3195 tty->print_cr("...<more frames>..."); | |
| 3196 return; | |
| 3197 } | |
| 3198 } | |
| 3199 } | |
| 3200 | |
| 3201 | |
| 3202 void JavaThread::trace_stack() { | |
| 3203 if (!has_last_Java_frame()) return; | |
| 3204 ResourceMark rm; | |
| 3205 HandleMark hm; | |
| 3206 RegisterMap reg_map(this); | |
| 3207 trace_stack_from(last_java_vframe(®_map)); | |
| 3208 } | |
| 3209 | |
| 3210 | |
| 3211 #endif // PRODUCT | |
| 3212 | |
| 3213 | |
| 3214 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3215 assert(reg_map != NULL, "a map must be given"); | |
| 3216 frame f = last_frame(); | |
| 3217 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3218 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3219 } | |
| 3220 return NULL; | |
| 3221 } | |
| 3222 | |
| 3223 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3224 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3225 vframeStream vfst(this); |
| 3226 vfst.security_get_caller_frame(depth); | |
| 3227 if (!vfst.at_end()) { | |
| 3228 return vfst.method()->method_holder(); | |
| 3229 } | |
| 3230 return NULL; | |
| 3231 } | |
| 3232 | |
| 3233 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3234 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3235 CompileBroker::compiler_thread_loop(); | |
| 3236 } | |
| 3237 | |
| 3238 // Create a CompilerThread | |
| 3239 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3240 : JavaThread(&compiler_thread_entry) { | |
| 3241 _env = NULL; | |
| 3242 _log = NULL; | |
| 3243 _task = NULL; | |
| 3244 _queue = queue; | |
| 3245 _counters = counters; | |
| 1584 | 3246 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3247 _scanned_nmethod = NULL; |
|
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
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12316
diff
changeset
|
3248 _compiler = NULL; |
| 0 | 3249 |
| 3250 #ifndef PRODUCT | |
| 3251 _ideal_graph_printer = NULL; | |
| 3252 #endif | |
| 3253 } | |
| 3254 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3255 void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
|
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
3256 JavaThread::oops_do(f, cld_f, cf); |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3257 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3258 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3259 // process it here to make sure it isn't unloaded in the middle of |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3260 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3261 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3262 } |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3263 } |
| 0 | 3264 |
|
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
parents:
12316
diff
changeset
|
3265 |
| 0 | 3266 // ======= Threads ======== |
| 3267 | |
| 3268 // The Threads class links together all active threads, and provides | |
| 3269 // operations over all threads. It is protected by its own Mutex | |
| 3270 // lock, which is also used in other contexts to protect thread | |
| 3271 // operations from having the thread being operated on from exiting | |
| 3272 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3273 | |
| 3274 JavaThread* Threads::_thread_list = NULL; | |
| 3275 int Threads::_number_of_threads = 0; | |
| 3276 int Threads::_number_of_non_daemon_threads = 0; | |
| 3277 int Threads::_return_code = 0; | |
| 3278 size_t JavaThread::_stack_size_at_create = 0; | |
|
6725
da91efe96a93
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|
3279 #ifdef ASSERT |
|
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|
3280 bool Threads::_vm_complete = false; |
|
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|
3281 #endif |
| 0 | 3282 |
| 3283 // All JavaThreads | |
| 3284 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3285 | |
| 3286 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3287 void Threads::threads_do(ThreadClosure* tc) { | |
| 3288 assert_locked_or_safepoint(Threads_lock); | |
| 3289 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3290 ALL_JAVA_THREADS(p) { | |
| 3291 tc->do_thread(p); | |
| 3292 } | |
| 3293 // Someday we could have a table or list of all non-JavaThreads. | |
| 3294 // For now, just manually iterate through them. | |
| 3295 tc->do_thread(VMThread::vm_thread()); | |
| 3296 Universe::heap()->gc_threads_do(tc); | |
|
323
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diff
changeset
|
3297 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
3298 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3299 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3300 // considering that WatchThread terminates when the VM is on the way to |
|
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diff
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|
3301 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3302 // way to prevent termination of WatcherThread would be to acquire |
|
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diff
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|
3303 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3304 // checking in some cases. |
|
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changeset
|
3305 if (wt != NULL) |
|
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changeset
|
3306 tc->do_thread(wt); |
|
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changeset
|
3307 |
| 0 | 3308 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3309 } | |
| 3310 | |
| 3311 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3312 | |
| 242 | 3313 extern void JDK_Version_init(); |
| 3314 | |
| 0 | 3315 // Check version |
| 3316 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3317 | |
| 3318 // Initialize the output stream module | |
| 3319 ostream_init(); | |
| 3320 | |
| 3321 // Process java launcher properties. | |
| 3322 Arguments::process_sun_java_launcher_properties(args); | |
| 3323 | |
| 3324 // Initialize the os module before using TLS | |
| 3325 os::init(); | |
| 3326 | |
| 3327 // Initialize system properties. | |
| 3328 Arguments::init_system_properties(); | |
| 3329 | |
| 242 | 3330 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3331 JDK_Version_init(); | |
| 3332 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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diff
changeset
|
3333 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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1731
diff
changeset
|
3334 Arguments::init_version_specific_system_properties(); |
|
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1731
diff
changeset
|
3335 |
| 0 | 3336 // Parse arguments |
| 3337 jint parse_result = Arguments::parse(args); | |
| 3338 if (parse_result != JNI_OK) return parse_result; | |
| 3339 | |
|
12233
40136aa2cdb1
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diff
changeset
|
3340 os::init_before_ergo(); |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
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diff
changeset
|
3341 |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
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diff
changeset
|
3342 jint ergo_result = Arguments::apply_ergo(); |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
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diff
changeset
|
3343 if (ergo_result != JNI_OK) return ergo_result; |
|
40136aa2cdb1
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12173
diff
changeset
|
3344 |
| 0 | 3345 if (PauseAtStartup) { |
| 3346 os::pause(); | |
| 3347 } | |
| 3348 | |
| 4006 | 3349 #ifndef USDT2 |
| 0 | 3350 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3351 #else /* USDT2 */ |
| 3352 HOTSPOT_VM_INIT_BEGIN(); | |
| 3353 #endif /* USDT2 */ | |
| 0 | 3354 |
| 3355 // Record VM creation timing statistics | |
| 3356 TraceVmCreationTime create_vm_timer; | |
| 3357 create_vm_timer.start(); | |
| 3358 | |
| 3359 // Timing (must come after argument parsing) | |
| 3360 TraceTime timer("Create VM", TraceStartupTime); | |
| 3361 | |
| 3362 // Initialize the os module after parsing the args | |
| 3363 jint os_init_2_result = os::init_2(); | |
| 3364 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3365 | |
|
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
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6985
diff
changeset
|
3366 jint adjust_after_os_result = Arguments::adjust_after_os(); |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
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6985
diff
changeset
|
3367 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
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diff
changeset
|
3368 |
| 6197 | 3369 // intialize TLS |
| 3370 ThreadLocalStorage::init(); | |
| 3371 | |
| 3372 // Bootstrap native memory tracking, so it can start recording memory | |
| 3373 // activities before worker thread is started. This is the first phase | |
| 3374 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3375 MemTracker::bootstrap_single_thread(); | |
| 3376 | |
| 0 | 3377 // Initialize output stream logging |
| 3378 ostream_init_log(); | |
| 3379 | |
| 3380 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3381 // Must be before create_vm_init_agents() | |
| 3382 if (Arguments::init_libraries_at_startup()) { | |
| 3383 convert_vm_init_libraries_to_agents(); | |
| 3384 } | |
| 3385 | |
| 3386 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3387 if (Arguments::init_agents_at_startup()) { | |
| 3388 create_vm_init_agents(); | |
| 3389 } | |
| 3390 | |
| 3391 // Initialize Threads state | |
| 3392 _thread_list = NULL; | |
| 3393 _number_of_threads = 0; | |
| 3394 _number_of_non_daemon_threads = 0; | |
| 3395 | |
| 3396 // Initialize global data structures and create system classes in heap | |
| 3397 vm_init_globals(); | |
| 3398 | |
| 3399 // Attach the main thread to this os thread | |
| 3400 JavaThread* main_thread = new JavaThread(); | |
| 3401 main_thread->set_thread_state(_thread_in_vm); | |
| 3402 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3403 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3404 // change the stack size recorded here to one based on the java thread | |
| 3405 // stacksize. This adjusted size is what is used to figure the placement | |
| 3406 // of the guard pages. | |
| 3407 main_thread->record_stack_base_and_size(); | |
| 3408 main_thread->initialize_thread_local_storage(); | |
| 3409 | |
| 3410 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3411 | |
| 3412 if (!main_thread->set_as_starting_thread()) { | |
| 3413 vm_shutdown_during_initialization( | |
| 3414 "Failed necessary internal allocation. Out of swap space"); | |
| 3415 delete main_thread; | |
| 3416 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3417 return JNI_ENOMEM; | |
| 3418 } | |
| 3419 | |
| 3420 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3421 // crash Linux VM, see notes in os_linux.cpp. | |
| 3422 main_thread->create_stack_guard_pages(); | |
| 3423 | |
| 1878 | 3424 // Initialize Java-Level synchronization subsystem |
| 3425 ObjectMonitor::Initialize() ; | |
| 0 | 3426 |
| 6197 | 3427 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3428 MemTracker::bootstrap_multi_thread(); | |
| 3429 | |
| 0 | 3430 // Initialize global modules |
| 3431 jint status = init_globals(); | |
| 3432 if (status != JNI_OK) { | |
| 3433 delete main_thread; | |
| 3434 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3435 return status; | |
| 3436 } | |
| 3437 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3438 // Should be done after the heap is fully created |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3439 main_thread->cache_global_variables(); |
|
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6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3440 |
| 0 | 3441 HandleMark hm; |
| 3442 | |
| 3443 { MutexLocker mu(Threads_lock); | |
| 3444 Threads::add(main_thread); | |
| 3445 } | |
| 3446 | |
| 3447 // Any JVMTI raw monitors entered in onload will transition into | |
| 3448 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3449 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3450 | |
| 6197 | 3451 // Fully start NMT |
| 3452 MemTracker::start(); | |
| 3453 | |
| 0 | 3454 // Create the VMThread |
| 3455 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3456 VMThread::create(); | |
| 3457 Thread* vmthread = VMThread::vm_thread(); | |
| 3458 | |
| 3459 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3460 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3461 | |
| 3462 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3463 // Monitors can have spurious returns, must always check another state flag | |
| 3464 { | |
| 3465 MutexLocker ml(Notify_lock); | |
| 3466 os::start_thread(vmthread); | |
| 3467 while (vmthread->active_handles() == NULL) { | |
| 3468 Notify_lock->wait(); | |
| 3469 } | |
| 3470 } | |
| 3471 } | |
| 3472 | |
| 3473 assert (Universe::is_fully_initialized(), "not initialized"); | |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3474 if (VerifyDuringStartup) { |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3475 // Make sure we're starting with a clean slate. |
|
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3476 VM_Verify verify_op; |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3477 VMThread::execute(&verify_op); |
|
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3478 } |
|
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
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8793
diff
changeset
|
3479 |
| 0 | 3480 EXCEPTION_MARK; |
| 3481 | |
| 3482 // At this point, the Universe is initialized, but we have not executed | |
| 3483 // any byte code. Now is a good time (the only time) to dump out the | |
| 3484 // internal state of the JVM for sharing. | |
| 3485 if (DumpSharedSpaces) { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
3486 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3487 ShouldNotReachHere(); |
| 3488 } | |
| 3489 | |
| 3490 // Always call even when there are not JVMTI environments yet, since environments | |
| 3491 // may be attached late and JVMTI must track phases of VM execution | |
| 3492 JvmtiExport::enter_start_phase(); | |
| 3493 | |
| 3494 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3495 JvmtiExport::post_vm_start(); | |
| 3496 | |
| 3497 { | |
| 3498 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3499 | |
| 3500 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3501 create_vm_init_libraries(); | |
| 3502 } | |
| 3503 | |
| 7608 | 3504 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3505 |
| 3506 // Initialize java_lang.System (needed before creating the thread) | |
| 7608 | 3507 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
| 3508 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
| 3509 Handle thread_group = create_initial_thread_group(CHECK_0); | |
| 3510 Universe::set_main_thread_group(thread_group()); | |
| 3511 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
| 3512 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
| 3513 main_thread->set_threadObj(thread_object); | |
| 3514 // Set thread status to running since main thread has | |
| 3515 // been started and running. | |
| 3516 java_lang_Thread::set_thread_status(thread_object, | |
| 3517 java_lang_Thread::RUNNABLE); | |
| 3518 | |
| 3519 // The VM creates & returns objects of this class. Make sure it's initialized. | |
| 3520 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
| 3521 | |
| 3522 // The VM preresolves methods to these classes. Make sure that they get initialized | |
| 3523 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
| 3524 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
| 3525 call_initializeSystemClass(CHECK_0); | |
| 3526 | |
| 3527 // get the Java runtime name after java.lang.System is initialized | |
| 3528 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
| 3529 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
| 0 | 3530 |
| 3531 // an instance of OutOfMemory exception has been allocated earlier | |
| 7608 | 3532 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
| 3533 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
| 3534 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
| 3535 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
| 3536 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
| 3537 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
| 3538 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
| 3539 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
|
2416
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2376
diff
changeset
|
3540 } |
| 0 | 3541 |
| 3542 // See : bugid 4211085. | |
| 3543 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3544 // property"java.compiler" and read & write property "java.vm.info". | |
| 3545 // When a security manager is installed through the command line | |
| 3546 // option "-Djava.security.manager", the above properties are not | |
| 3547 // readable and the static initializer for java.lang.Compiler fails | |
| 3548 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3549 // user code which calls methods in java.lang.Compiler. | |
| 3550 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3551 // system domains are on the stack when the properties are read. | |
| 3552 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3553 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3554 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3555 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3556 // Once that is done, we should remove this hack. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3557 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3558 |
| 3559 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3560 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3561 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3562 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3563 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3564 reset_vm_info_property(CHECK_0); | |
| 3565 | |
| 3566 quicken_jni_functions(); | |
| 3567 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
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4873
diff
changeset
|
3568 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
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4873
diff
changeset
|
3569 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
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4873
diff
changeset
|
3570 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3571 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
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4873
diff
changeset
|
3572 |
| 0 | 3573 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3574 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3575 set_init_completed(); | |
| 3576 | |
|
17979
e204777ac770
8042933: assert(capacity_until_gc >= committed_bytes) failed
ehelin
parents:
17937
diff
changeset
|
3577 Metaspace::post_initialize(); |
|
e204777ac770
8042933: assert(capacity_until_gc >= committed_bytes) failed
ehelin
parents:
17937
diff
changeset
|
3578 |
| 4006 | 3579 #ifndef USDT2 |
| 0 | 3580 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3581 #else /* USDT2 */ |
| 3582 HOTSPOT_VM_INIT_END(); | |
| 3583 #endif /* USDT2 */ | |
| 0 | 3584 |
| 3585 // record VM initialization completion time | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3586 #if INCLUDE_MANAGEMENT |
| 0 | 3587 Management::record_vm_init_completed(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3588 #endif // INCLUDE_MANAGEMENT |
| 0 | 3589 |
| 3590 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3591 // valid exceptions may be thrown in the process. | |
| 3592 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3593 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3594 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3595 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3596 if (HAS_PENDING_EXCEPTION) { | |
| 3597 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3598 } | |
| 3599 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3600 #if INCLUDE_ALL_GCS |
| 0 | 3601 // Support for ConcurrentMarkSweep. This should be cleaned up |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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parents:
62
diff
changeset
|
3602 // and better encapsulated. The ugly nested if test would go away |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3603 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3604 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3605 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3606 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3607 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3608 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3609 } |
| 0 | 3610 if (HAS_PENDING_EXCEPTION) { |
| 3611 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3612 } | |
| 3613 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3614 #endif // INCLUDE_ALL_GCS |
| 0 | 3615 |
| 3616 // Always call even when there are not JVMTI environments yet, since environments | |
| 3617 // may be attached late and JVMTI must track phases of VM execution | |
| 3618 JvmtiExport::enter_live_phase(); | |
| 3619 | |
| 3620 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3621 os::signal_init(); | |
| 3622 | |
| 3623 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3624 if (!DisableAttachMechanism) { | |
|
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3625 AttachListener::vm_start(); |
| 0 | 3626 if (StartAttachListener || AttachListener::init_at_startup()) { |
| 3627 AttachListener::init(); | |
| 3628 } | |
| 3629 } | |
| 3630 | |
| 3631 // Launch -Xrun agents | |
| 3632 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3633 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3634 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3635 create_vm_init_libraries(); | |
| 3636 } | |
| 3637 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3638 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3639 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3640 |
| 10405 | 3641 if (TRACE_START() != JNI_OK) { |
| 3642 vm_exit_during_initialization("Failed to start tracing backend."); | |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3643 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3644 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3645 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3646 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3647 } |
| 0 | 3648 |
| 3649 // initialize compiler(s) | |
| 7195 | 3650 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
| 0 | 3651 CompileBroker::compilation_init(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3652 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3653 |
|
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3654 if (EnableInvokeDynamic) { |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3655 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3656 // It is done after compilers are initialized, because otherwise compilations of |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3657 // signature polymorphic MH intrinsics can be missed |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3658 // (see SystemDictionary::find_method_handle_intrinsic). |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3659 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK_0); |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3660 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK_0); |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3661 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK_0); |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3662 } |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3663 |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3664 #if INCLUDE_MANAGEMENT |
| 0 | 3665 Management::initialize(THREAD); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3666 #endif // INCLUDE_MANAGEMENT |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3667 |
| 0 | 3668 if (HAS_PENDING_EXCEPTION) { |
| 3669 // management agent fails to start possibly due to | |
| 3670 // configuration problem and is responsible for printing | |
| 3671 // stack trace if appropriate. Simply exit VM. | |
| 3672 vm_exit(1); | |
| 3673 } | |
| 3674 | |
| 3675 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3676 if (MemProfiling) MemProfiler::engage(); | |
| 3677 StatSampler::engage(); | |
| 3678 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3679 | |
| 3680 BiasedLocking::init(); | |
| 3681 | |
| 17780 | 3682 #if INCLUDE_RTM_OPT |
| 3683 RTMLockingCounters::init(); | |
| 3684 #endif | |
| 3685 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3686 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3687 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3688 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3689 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3690 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3691 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3692 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3693 } |
| 0 | 3694 |
|
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3695 { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3696 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3697 // Make sure the watcher thread can be started by WatcherThread::start() |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3698 // or by dynamic enrollment. |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3699 WatcherThread::make_startable(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3700 // Start up the WatcherThread if there are any periodic tasks |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3701 // NOTE: All PeriodicTasks should be registered by now. If they |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3702 // aren't, late joiners might appear to start slowly (we might |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3703 // take a while to process their first tick). |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3704 if (PeriodicTask::num_tasks() > 0) { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3705 WatcherThread::start(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3706 } |
| 0 | 3707 } |
| 3708 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3709 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3710 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3711 |
| 0 | 3712 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3713 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3714 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3715 #endif |
| 0 | 3716 return JNI_OK; |
| 3717 } | |
| 3718 | |
| 3719 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3720 extern "C" { | |
| 3721 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3722 } | |
| 3723 // Find a command line agent library and return its entry point for | |
| 3724 // -agentlib: -agentpath: -Xrun | |
| 3725 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3726 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3727 OnLoadEntry_t on_load_entry = NULL; | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3728 void *library = NULL; |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3729 |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3730 if (!agent->valid()) { |
| 0 | 3731 char buffer[JVM_MAXPATHLEN]; |
| 3732 char ebuf[1024]; | |
| 3733 const char *name = agent->name(); | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3734 const char *msg = "Could not find agent library "; |
| 0 | 3735 |
| 12220 | 3736 // First check to see if agent is statically linked into executable |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3737 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) { |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3738 library = agent->os_lib(); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3739 } else if (agent->is_absolute_path()) { |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3740 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3741 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3742 const char *sub_msg = " in absolute path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3743 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3744 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3745 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3746 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3747 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3748 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3749 } |
| 3750 } else { | |
| 3751 // Try to load the agent from the standard dll directory | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3752 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3753 name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3754 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3755 } |
| 0 | 3756 if (library == NULL) { // Try the local directory |
| 3757 char ns[1] = {0}; | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3758 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3759 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3760 } |
| 0 | 3761 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3762 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3763 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3764 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3765 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3766 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3767 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3768 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3769 } |
| 3770 } | |
| 3771 } | |
| 3772 agent->set_os_lib(library); | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3773 agent->set_valid(); |
| 0 | 3774 } |
| 3775 | |
| 3776 // Find the OnLoad function. | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3777 on_load_entry = |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3778 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3779 false, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3780 on_load_symbols, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3781 num_symbol_entries)); |
| 0 | 3782 return on_load_entry; |
| 3783 } | |
| 3784 | |
| 3785 // Find the JVM_OnLoad entry point | |
| 3786 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3787 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3788 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3789 } | |
| 3790 | |
| 3791 // Find the Agent_OnLoad entry point | |
| 3792 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3793 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3794 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3795 } | |
| 3796 | |
| 3797 // For backwards compatibility with -Xrun | |
| 3798 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3799 // treated like -agentpath: | |
| 3800 // Must be called before agent libraries are created | |
| 3801 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3802 AgentLibrary* agent; | |
| 3803 AgentLibrary* next; | |
| 3804 | |
| 3805 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3806 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3807 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3808 | |
| 3809 // If there is an JVM_OnLoad function it will get called later, | |
| 3810 // otherwise see if there is an Agent_OnLoad | |
| 3811 if (on_load_entry == NULL) { | |
| 3812 on_load_entry = lookup_agent_on_load(agent); | |
| 3813 if (on_load_entry != NULL) { | |
| 3814 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3815 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3816 Arguments::convert_library_to_agent(agent); | |
| 3817 } else { | |
| 3818 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3819 } | |
| 3820 } | |
| 3821 } | |
| 3822 } | |
| 3823 | |
| 3824 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3825 // Invokes Agent_OnLoad | |
| 3826 // Called very early -- before JavaThreads exist | |
| 3827 void Threads::create_vm_init_agents() { | |
| 3828 extern struct JavaVM_ main_vm; | |
| 3829 AgentLibrary* agent; | |
| 3830 | |
| 3831 JvmtiExport::enter_onload_phase(); | |
|
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3832 |
| 0 | 3833 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3834 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3835 | |
| 3836 if (on_load_entry != NULL) { | |
| 3837 // Invoke the Agent_OnLoad function | |
| 3838 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3839 if (err != JNI_OK) { | |
| 3840 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3841 } | |
| 3842 } else { | |
| 3843 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3844 } | |
| 3845 } | |
| 3846 JvmtiExport::enter_primordial_phase(); | |
| 3847 } | |
| 3848 | |
| 3849 extern "C" { | |
| 3850 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3851 } | |
| 3852 | |
| 3853 void Threads::shutdown_vm_agents() { | |
| 3854 // Send any Agent_OnUnload notifications | |
| 3855 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
|
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|
3856 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); |
| 0 | 3857 extern struct JavaVM_ main_vm; |
| 3858 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3859 | |
| 3860 // Find the Agent_OnUnload function. | |
|
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|
3861 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
|
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|
3862 os::find_agent_function(agent, |
|
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|
3863 false, |
|
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|
3864 on_unload_symbols, |
|
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|
3865 num_symbol_entries)); |
|
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|
3866 |
|
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|
3867 // Invoke the Agent_OnUnload function |
|
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|
3868 if (unload_entry != NULL) { |
|
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|
3869 JavaThread* thread = JavaThread::current(); |
|
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|
3870 ThreadToNativeFromVM ttn(thread); |
|
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|
3871 HandleMark hm(thread); |
|
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|
3872 (*unload_entry)(&main_vm); |
| 0 | 3873 } |
| 3874 } | |
| 3875 } | |
| 3876 | |
| 3877 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3878 // Invokes JVM_OnLoad | |
| 3879 void Threads::create_vm_init_libraries() { | |
| 3880 extern struct JavaVM_ main_vm; | |
| 3881 AgentLibrary* agent; | |
| 3882 | |
| 3883 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3884 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3885 | |
| 3886 if (on_load_entry != NULL) { | |
| 3887 // Invoke the JVM_OnLoad function | |
| 3888 JavaThread* thread = JavaThread::current(); | |
| 3889 ThreadToNativeFromVM ttn(thread); | |
| 3890 HandleMark hm(thread); | |
| 3891 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3892 if (err != JNI_OK) { | |
| 3893 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3894 } | |
| 3895 } else { | |
| 3896 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3897 } | |
| 3898 } | |
| 3899 } | |
| 3900 | |
| 3901 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3902 void JavaThread::invoke_shutdown_hooks() { | |
| 3903 HandleMark hm(this); | |
| 3904 | |
| 3905 // We could get here with a pending exception, if so clear it now. | |
| 3906 if (this->has_pending_exception()) { | |
| 3907 this->clear_pending_exception(); | |
| 3908 } | |
| 3909 | |
| 3910 EXCEPTION_MARK; | |
|
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3911 Klass* k = |
|
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|
3912 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3913 THREAD); |
| 3914 if (k != NULL) { | |
| 3915 // SystemDictionary::resolve_or_null will return null if there was | |
| 3916 // an exception. If we cannot load the Shutdown class, just don't | |
| 3917 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3918 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3919 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3920 // was called, the Shutdown class would have already been loaded | |
| 3921 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3922 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3923 JavaValue result(T_VOID); | |
| 3924 JavaCalls::call_static(&result, | |
| 3925 shutdown_klass, | |
|
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|
3926 vmSymbols::shutdown_method_name(), |
|
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|
3927 vmSymbols::void_method_signature(), |
| 0 | 3928 THREAD); |
| 3929 } | |
| 3930 CLEAR_PENDING_EXCEPTION; | |
| 3931 } | |
| 3932 | |
| 3933 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3934 // the program falls off the end of main(). Another VM exit path is through | |
| 3935 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3936 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3937 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3938 // and VM_Exit op at VM level. | |
| 3939 // | |
| 3940 // Shutdown sequence: | |
| 6197 | 3941 // + Shutdown native memory tracking if it is on |
| 0 | 3942 // + Wait until we are the last non-daemon thread to execute |
| 3943 // <-- every thing is still working at this moment --> | |
| 3944 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3945 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3946 // + Call before_exit(), prepare for VM exit | |
| 3947 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3948 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3949 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3950 // post thread end and vm death events to JVMTI, | |
| 3951 // stop signal thread | |
| 3952 // + Call JavaThread::exit(), it will: | |
| 3953 // > release JNI handle blocks, remove stack guard pages | |
| 3954 // > remove this thread from Threads list | |
| 3955 // <-- no more Java code from this thread after this point --> | |
| 3956 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3957 // the compiler threads at safepoint | |
| 3958 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3959 // + Disable tracing at JNI/JVM barriers | |
| 3960 // + Set _vm_exited flag for threads that are still running native code | |
| 3961 // + Delete this thread | |
| 3962 // + Call exit_globals() | |
| 3963 // > deletes tty | |
| 3964 // > deletes PerfMemory resources | |
| 3965 // + Return to caller | |
| 3966 | |
| 3967 bool Threads::destroy_vm() { | |
| 3968 JavaThread* thread = JavaThread::current(); | |
| 3969 | |
|
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3970 #ifdef ASSERT |
|
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|
3971 _vm_complete = false; |
|
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|
3972 #endif |
| 0 | 3973 // Wait until we are the last non-daemon thread to execute |
| 3974 { MutexLocker nu(Threads_lock); | |
| 3975 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3976 // This wait should make safepoint checks, wait without a timeout, | |
| 3977 // and wait as a suspend-equivalent condition. | |
| 3978 // | |
| 3979 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3980 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3981 // is waiting for the external suspend request on this thread to | |
| 3982 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3983 // timeout, but that takes time. Making this wait a suspend- | |
| 3984 // equivalent condition solves that timeout problem. | |
| 3985 // | |
| 3986 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3987 Mutex::_as_suspend_equivalent_flag); | |
| 3988 } | |
| 3989 | |
| 3990 // Hang forever on exit if we are reporting an error. | |
| 3991 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3992 os::infinite_sleep(); | |
| 3993 } | |
|
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|
3994 os::wait_for_keypress_at_exit(); |
| 0 | 3995 |
| 3996 if (JDK_Version::is_jdk12x_version()) { | |
| 3997 // We are the last thread running, so check if finalizers should be run. | |
| 3998 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3999 HandleMark rm(thread); | |
| 4000 Universe::run_finalizers_on_exit(); | |
| 4001 } else { | |
| 4002 // run Java level shutdown hooks | |
| 4003 thread->invoke_shutdown_hooks(); | |
| 4004 } | |
| 4005 | |
| 4006 before_exit(thread); | |
| 4007 | |
| 4008 thread->exit(true); | |
| 4009 | |
| 4010 // Stop VM thread. | |
| 4011 { | |
| 4012 // 4945125 The vm thread comes to a safepoint during exit. | |
| 4013 // GC vm_operations can get caught at the safepoint, and the | |
| 4014 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 4015 // to prevent this. The GC vm_operations will not be able to | |
| 4016 // queue until after the vm thread is dead. | |
|
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4017 // After this point, we'll never emerge out of the safepoint before |
|
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|
4018 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
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|
4019 // stopped; they remain inactive until the process exits. |
|
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|
4020 // Note: some concurrent G1 threads may be running during a safepoint, |
|
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|
4021 // but these will not be accessing the heap, just some G1-specific side |
|
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|
4022 // data structures that are not accessed by any other threads but them |
|
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|
4023 // after this point in a terminal safepoint. |
|
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|
4024 |
| 0 | 4025 MutexLocker ml(Heap_lock); |
| 4026 | |
| 4027 VMThread::wait_for_vm_thread_exit(); | |
| 4028 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 4029 VMThread::destroy(); | |
| 4030 } | |
| 4031 | |
| 4032 // clean up ideal graph printers | |
| 4033 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 4034 IdealGraphPrinter::clean_up(); | |
| 4035 #endif | |
| 4036 | |
| 4037 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 4038 // running Java code or in VM are stopped by the Safepoint. However, | |
| 4039 // daemon threads executing native code are still running. But they | |
| 4040 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 4041 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 4042 | |
| 4043 #ifndef PRODUCT | |
| 4044 // disable function tracing at JNI/JVM barriers | |
| 4045 TraceJNICalls = false; | |
| 4046 TraceJVMCalls = false; | |
| 4047 TraceRuntimeCalls = false; | |
| 4048 #endif | |
| 4049 | |
| 4050 VM_Exit::set_vm_exited(); | |
| 4051 | |
| 4052 notify_vm_shutdown(); | |
| 4053 | |
| 4054 delete thread; | |
| 4055 | |
| 4056 // exit_globals() will delete tty | |
| 4057 exit_globals(); | |
| 4058 | |
| 4059 return true; | |
| 4060 } | |
| 4061 | |
| 4062 | |
| 4063 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4064 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4065 return is_supported_jni_version(version); | |
| 4066 } | |
| 4067 | |
| 4068 | |
| 4069 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4070 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4071 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4072 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
|
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|
4073 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
| 0 | 4074 return JNI_FALSE; |
| 4075 } | |
| 4076 | |
| 4077 | |
| 4078 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4079 // The threads lock must be owned at this point | |
| 4080 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4081 |
|
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|
4082 // See the comment for this method in thread.hpp for its purpose and |
|
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|
4083 // why it is called here. |
|
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|
4084 p->initialize_queues(); |
| 0 | 4085 p->set_next(_thread_list); |
| 4086 _thread_list = p; | |
| 4087 _number_of_threads++; | |
| 4088 oop threadObj = p->threadObj(); | |
| 4089 bool daemon = true; | |
| 4090 // Bootstrapping problem: threadObj can be null for initial | |
| 4091 // JavaThread (or for threads attached via JNI) | |
| 4092 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4093 _number_of_non_daemon_threads++; | |
| 4094 daemon = false; | |
| 4095 } | |
| 4096 | |
| 6197 | 4097 p->set_safepoint_visible(true); |
| 4098 | |
| 0 | 4099 ThreadService::add_thread(p, daemon); |
| 4100 | |
| 4101 // Possible GC point. | |
|
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|
4102 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4103 } |
| 4104 | |
| 4105 void Threads::remove(JavaThread* p) { | |
| 4106 // Extra scope needed for Thread_lock, so we can check | |
| 4107 // that we do not remove thread without safepoint code notice | |
| 4108 { MutexLocker ml(Threads_lock); | |
| 4109 | |
| 4110 assert(includes(p), "p must be present"); | |
| 4111 | |
| 4112 JavaThread* current = _thread_list; | |
| 4113 JavaThread* prev = NULL; | |
| 4114 | |
| 4115 while (current != p) { | |
| 4116 prev = current; | |
| 4117 current = current->next(); | |
| 4118 } | |
| 4119 | |
| 4120 if (prev) { | |
| 4121 prev->set_next(current->next()); | |
| 4122 } else { | |
| 4123 _thread_list = p->next(); | |
| 4124 } | |
| 4125 _number_of_threads--; | |
| 4126 oop threadObj = p->threadObj(); | |
| 4127 bool daemon = true; | |
| 4128 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4129 _number_of_non_daemon_threads--; | |
| 4130 daemon = false; | |
| 4131 | |
| 4132 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4133 // on destroy_vm will wake up. | |
| 4134 if (number_of_non_daemon_threads() == 1) | |
| 4135 Threads_lock->notify_all(); | |
| 4136 } | |
| 4137 ThreadService::remove_thread(p, daemon); | |
| 4138 | |
| 4139 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4140 // the thread might mess around with locks after this point. This can cause it | |
| 4141 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4142 // of this thread since it is removed from the queue. | |
| 4143 p->set_terminated_value(); | |
| 6197 | 4144 |
| 4145 // Now, this thread is not visible to safepoint | |
| 4146 p->set_safepoint_visible(false); | |
|
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4147 // once the thread becomes safepoint invisible, we can not use its per-thread |
|
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|
4148 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
|
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|
4149 // to release its per-thread recorder here. |
|
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|
4150 MemTracker::thread_exiting(p); |
| 0 | 4151 } // unlock Threads_lock |
| 4152 | |
| 4153 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4154 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4155 } |
| 4156 | |
| 4157 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4158 bool Threads::includes(JavaThread* p) { | |
| 4159 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4160 ALL_JAVA_THREADS(q) { | |
| 4161 if (q == p ) { | |
| 4162 return true; | |
| 4163 } | |
| 4164 } | |
| 4165 return false; | |
| 4166 } | |
| 4167 | |
| 4168 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4169 // but the garbage collector must provide a safe context for them to run. | |
| 4170 // In particular, these things should never be called when the Threads_lock | |
| 4171 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4172 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4173 // all threads gets blocked when exiting or starting). | |
| 4174 | |
|
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8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4175 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4176 ALL_JAVA_THREADS(p) { |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4177 p->oops_do(f, cld_f, cf); |
| 0 | 4178 } |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
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7177
diff
changeset
|
4179 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
| 0 | 4180 } |
| 4181 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4182 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4183 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4184 // root groups. Overhead should be small enough to use all the time, | |
| 4185 // even in sequential code. | |
| 4186 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4042
diff
changeset
|
4187 // Cannot yet substitute active_workers for n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4042
diff
changeset
|
4188 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4189 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4042
diff
changeset
|
4190 // turn off parallelism in process_strong_roots while active_workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4042
diff
changeset
|
4191 // is being used for parallelism elsewhere. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4042
diff
changeset
|
4192 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4193 assert(!is_par || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4194 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4195 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4196 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4197 ALL_JAVA_THREADS(p) { | |
| 4198 if (p->claim_oops_do(is_par, cp)) { | |
|
7179
d0aa87f04bd5
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7177
diff
changeset
|
4199 p->oops_do(f, cld_f, cf); |
| 0 | 4200 } |
| 4201 } | |
| 4202 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3938
diff
changeset
|
4203 if (vmt->claim_oops_do(is_par, cp)) { |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4204 vmt->oops_do(f, cld_f, cf); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4205 } |
| 0 | 4206 } |
| 4207 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
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diff
changeset
|
4208 #if INCLUDE_ALL_GCS |
| 0 | 4209 // Used by ParallelScavenge |
| 4210 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4211 ALL_JAVA_THREADS(p) { | |
| 4212 q->enqueue(new ThreadRootsTask(p)); | |
| 4213 } | |
| 4214 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4215 } | |
| 4216 | |
| 4217 // Used by Parallel Old | |
| 4218 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4219 ALL_JAVA_THREADS(p) { | |
| 4220 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4221 } | |
| 4222 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4223 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4224 #endif // INCLUDE_ALL_GCS |
| 0 | 4225 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4226 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4227 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4228 p->nmethods_do(cf); |
| 0 | 4229 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4230 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4231 } |
| 4232 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4233 void Threads::metadata_do(void f(Metadata*)) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4234 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4235 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4236 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4237 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4238 |
| 0 | 4239 void Threads::gc_epilogue() { |
| 4240 ALL_JAVA_THREADS(p) { | |
| 4241 p->gc_epilogue(); | |
| 4242 } | |
| 4243 } | |
| 4244 | |
| 4245 void Threads::gc_prologue() { | |
| 4246 ALL_JAVA_THREADS(p) { | |
| 4247 p->gc_prologue(); | |
| 4248 } | |
| 4249 } | |
| 4250 | |
| 4251 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4252 ALL_JAVA_THREADS(p) { | |
| 4253 p->deoptimized_wrt_marked_nmethods(); | |
| 4254 } | |
| 4255 } | |
| 4256 | |
| 4257 | |
| 4258 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4259 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4260 address monitor, bool doLock) { | |
| 4261 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4262 "must grab Threads_lock or be at safepoint"); | |
| 4263 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4264 | |
| 4265 int i = 0; | |
| 4266 { | |
| 4267 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4268 ALL_JAVA_THREADS(p) { | |
| 4269 if (p->is_Compiler_thread()) continue; | |
| 4270 | |
| 4271 address pending = (address)p->current_pending_monitor(); | |
| 4272 if (pending == monitor) { // found a match | |
| 4273 if (i < count) result->append(p); // save the first count matches | |
| 4274 i++; | |
| 4275 } | |
| 4276 } | |
| 4277 } | |
| 4278 return result; | |
| 4279 } | |
| 4280 | |
| 4281 | |
| 4282 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4283 assert(doLock || | |
| 4284 Threads_lock->owned_by_self() || | |
| 4285 SafepointSynchronize::is_at_safepoint(), | |
| 4286 "must grab Threads_lock or be at safepoint"); | |
| 4287 | |
| 4288 // NULL owner means not locked so we can skip the search | |
| 4289 if (owner == NULL) return NULL; | |
| 4290 | |
| 4291 { | |
| 4292 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4293 ALL_JAVA_THREADS(p) { | |
| 4294 // first, see if owner is the address of a Java thread | |
| 4295 if (owner == (address)p) return p; | |
| 4296 } | |
| 4297 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4298 // Cannot assert on lack of success here since this function may be |
|
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4299 // used by code that is trying to report useful problem information |
|
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4300 // like deadlock detection. |
| 0 | 4301 if (UseHeavyMonitors) return NULL; |
| 4302 | |
| 4303 // | |
| 4304 // If we didn't find a matching Java thread and we didn't force use of | |
| 4305 // heavyweight monitors, then the owner is the stack address of the | |
| 4306 // Lock Word in the owning Java thread's stack. | |
| 4307 // | |
| 4308 JavaThread* the_owner = NULL; | |
| 4309 { | |
| 4310 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4311 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4312 if (q->is_lock_owned(owner)) { |
| 0 | 4313 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4314 break; |
| 0 | 4315 } |
| 4316 } | |
| 4317 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4318 // cannot assert on lack of success here; see above comment |
| 0 | 4319 return the_owner; |
| 4320 } | |
| 4321 | |
| 4322 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4323 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4324 char buf[32]; | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17876
diff
changeset
|
4325 st->print_cr("%s", os::local_time_string(buf, sizeof(buf))); |
| 0 | 4326 |
| 4327 st->print_cr("Full thread dump %s (%s %s):", | |
| 4328 Abstract_VM_Version::vm_name(), | |
| 4329 Abstract_VM_Version::vm_release(), | |
| 4330 Abstract_VM_Version::vm_info_string() | |
| 4331 ); | |
| 4332 st->cr(); | |
| 4333 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4334 #if INCLUDE_ALL_GCS |
| 0 | 4335 // Dump concurrent locks |
| 4336 ConcurrentLocksDump concurrent_locks; | |
| 4337 if (print_concurrent_locks) { | |
| 4338 concurrent_locks.dump_at_safepoint(); | |
| 4339 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4340 #endif // INCLUDE_ALL_GCS |
| 0 | 4341 |
| 4342 ALL_JAVA_THREADS(p) { | |
| 4343 ResourceMark rm; | |
| 4344 p->print_on(st); | |
| 4345 if (print_stacks) { | |
| 4346 if (internal_format) { | |
| 4347 p->trace_stack(); | |
| 4348 } else { | |
| 4349 p->print_stack_on(st); | |
| 4350 } | |
| 4351 } | |
| 4352 st->cr(); | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4353 #if INCLUDE_ALL_GCS |
| 0 | 4354 if (print_concurrent_locks) { |
| 4355 concurrent_locks.print_locks_on(p, st); | |
| 4356 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4357 #endif // INCLUDE_ALL_GCS |
| 0 | 4358 } |
| 4359 | |
| 4360 VMThread::vm_thread()->print_on(st); | |
| 4361 st->cr(); | |
| 4362 Universe::heap()->print_gc_threads_on(st); | |
| 4363 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4364 if (wt != NULL) { |
| 4365 wt->print_on(st); | |
| 4366 st->cr(); | |
| 4367 } | |
| 0 | 4368 CompileBroker::print_compiler_threads_on(st); |
| 4369 st->flush(); | |
| 4370 } | |
| 4371 | |
| 4372 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4373 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4374 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4375 // memory (even in resource area), it might deadlock the error handler. | |
| 4376 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4377 bool found_current = false; | |
| 4378 st->print_cr("Java Threads: ( => current thread )"); | |
| 4379 ALL_JAVA_THREADS(thread) { | |
| 4380 bool is_current = (current == thread); | |
| 4381 found_current = found_current || is_current; | |
| 4382 | |
| 4383 st->print("%s", is_current ? "=>" : " "); | |
| 4384 | |
| 4385 st->print(PTR_FORMAT, thread); | |
| 4386 st->print(" "); | |
| 4387 thread->print_on_error(st, buf, buflen); | |
| 4388 st->cr(); | |
| 4389 } | |
| 4390 st->cr(); | |
| 4391 | |
| 4392 st->print_cr("Other Threads:"); | |
| 4393 if (VMThread::vm_thread()) { | |
| 4394 bool is_current = (current == VMThread::vm_thread()); | |
| 4395 found_current = found_current || is_current; | |
| 4396 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4397 | |
| 4398 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4399 st->print(" "); | |
| 4400 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4401 st->cr(); | |
| 4402 } | |
| 4403 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4404 if (wt != NULL) { | |
| 4405 bool is_current = (current == wt); | |
| 4406 found_current = found_current || is_current; | |
| 4407 st->print("%s", is_current ? "=>" : " "); | |
| 4408 | |
| 4409 st->print(PTR_FORMAT, wt); | |
| 4410 st->print(" "); | |
| 4411 wt->print_on_error(st, buf, buflen); | |
| 4412 st->cr(); | |
| 4413 } | |
| 4414 if (!found_current) { | |
| 4415 st->cr(); | |
| 4416 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4417 current->print_on_error(st, buf, buflen); | |
| 4418 st->cr(); | |
| 4419 } | |
| 4420 } | |
| 4421 | |
| 1878 | 4422 // Internal SpinLock and Mutex |
| 4423 // Based on ParkEvent | |
| 4424 | |
| 4425 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4426 // |
| 1878 | 4427 // We employ SpinLocks _only for low-contention, fixed-length |
| 4428 // short-duration critical sections where we're concerned | |
| 4429 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4430 // The mux construct provides a spin-then-block mutual exclusion | |
| 4431 // mechanism. | |
| 4432 // | |
| 4433 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4434 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4435 // for the JVM to devolve to yielding with little progress. This is true | |
| 4436 // despite the fact that the critical sections protected by ListLock are | |
| 4437 // extremely short. | |
| 0 | 4438 // |
| 1878 | 4439 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4440 // We should make this a 1st-class type, integrated into the lock | |
| 4441 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4442 // should have sufficient padding to avoid false-sharing and excessive | |
| 4443 // cache-coherency traffic. | |
| 4444 | |
| 4445 | |
| 4446 typedef volatile int SpinLockT ; | |
| 4447 | |
| 4448 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4449 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4450 return ; // normal fast-path return | |
| 4451 } | |
| 4452 | |
| 4453 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4454 TEVENT (SpinAcquire - ctx) ; | |
| 4455 int ctr = 0 ; | |
| 4456 int Yields = 0 ; | |
| 0 | 4457 for (;;) { |
| 1878 | 4458 while (*adr != 0) { |
| 4459 ++ctr ; | |
| 4460 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4461 if (Yields > 5) { | |
|
17706
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
dsimms
parents:
13004
diff
changeset
|
4462 os::naked_short_sleep(1); |
| 1878 | 4463 } else { |
| 4464 os::NakedYield() ; | |
| 4465 ++Yields ; | |
| 4466 } | |
| 4467 } else { | |
| 4468 SpinPause() ; | |
| 0 | 4469 } |
| 1878 | 4470 } |
| 4471 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4472 } |
| 4473 } | |
| 4474 | |
| 1878 | 4475 void Thread::SpinRelease (volatile int * adr) { |
| 4476 assert (*adr != 0, "invariant") ; | |
| 4477 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4478 // Roach-motel semantics. | |
| 4479 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4480 // but prior LDs and STs within the critical section can't be allowed | |
| 4481 // to reorder or float past the ST that releases the lock. | |
| 4482 *adr = 0 ; | |
| 0 | 4483 } |
| 4484 | |
| 1878 | 4485 // muxAcquire and muxRelease: |
| 4486 // | |
| 4487 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4488 // The LSB of the word is set IFF the lock is held. | |
| 4489 // The remainder of the word points to the head of a singly-linked list | |
| 4490 // of threads blocked on the lock. | |
| 4491 // | |
| 4492 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4493 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4494 // minimizing the peak number of extant ParkEvent instances then | |
| 4495 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4496 // as certain invariants were satisfied. Specifically, care would need | |
| 4497 // to be taken with regards to consuming unpark() "permits". | |
| 4498 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4499 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4500 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4501 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4502 // One way around this would be to widen the restricted-range semaphore | |
| 4503 // implemented in park(). Another alternative would be to provide | |
| 4504 // multiple instances of the PlatformEvent() for each thread. One | |
| 4505 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4506 // | |
| 4507 // * Usage: | |
| 4508 // -- Only as leaf locks | |
| 4509 // -- for short-term locking only as muxAcquire does not perform | |
| 4510 // thread state transitions. | |
| 4511 // | |
| 4512 // Alternatives: | |
| 4513 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4514 // but with parking or spin-then-park instead of pure spinning. | |
| 4515 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4516 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4517 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4518 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4519 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4520 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4521 // boundaries by using placement-new. | |
| 4522 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4523 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4524 // The validity of the backlinks must be ratified before we trust the value. | |
| 4525 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4526 // the forward links, which are always trustworthy. | |
| 4527 // * Add a successor indication. The LockWord is currently encoded as | |
| 4528 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4529 // to provide the usual futile-wakeup optimization. | |
| 4530 // See RTStt for details. | |
| 4531 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4532 // | |
| 4533 | |
| 4534 | |
| 4535 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4536 enum MuxBits { LOCKBIT = 1 } ; | |
| 4537 | |
| 4538 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4539 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4540 if (w == 0) return ; | |
| 4541 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4542 return ; | |
| 4543 } | |
| 4544 | |
| 4545 TEVENT (muxAcquire - Contention) ; | |
| 4546 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4547 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4548 for (;;) { |
| 1878 | 4549 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4550 | |
| 4551 // Optional spin phase: spin-then-park strategy | |
| 4552 while (--its >= 0) { | |
| 4553 w = *Lock ; | |
| 4554 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4555 return ; | |
| 4556 } | |
| 4557 } | |
| 4558 | |
| 4559 Self->reset() ; | |
| 4560 Self->OnList = intptr_t(Lock) ; | |
| 4561 // The following fence() isn't _strictly necessary as the subsequent | |
| 4562 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4563 OrderAccess::fence(); | |
| 4564 for (;;) { | |
| 4565 w = *Lock ; | |
| 4566 if ((w & LOCKBIT) == 0) { | |
| 4567 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4568 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4569 return ; | |
| 4570 } | |
| 4571 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4572 } |
| 1878 | 4573 assert (w & LOCKBIT, "invariant") ; |
| 4574 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4575 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4576 } | |
| 4577 | |
| 4578 while (Self->OnList != 0) { | |
| 4579 Self->park() ; | |
| 4580 } | |
| 0 | 4581 } |
| 4582 } | |
| 4583 | |
| 1878 | 4584 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4585 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4586 if (w == 0) return ; | |
| 4587 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4588 return ; | |
| 4589 } | |
| 4590 | |
| 4591 TEVENT (muxAcquire - Contention) ; | |
| 4592 ParkEvent * ReleaseAfter = NULL ; | |
| 4593 if (ev == NULL) { | |
| 4594 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4595 } | |
| 4596 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4597 for (;;) { | |
| 4598 guarantee (ev->OnList == 0, "invariant") ; | |
| 4599 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4600 | |
| 4601 // Optional spin phase: spin-then-park strategy | |
| 4602 while (--its >= 0) { | |
| 4603 w = *Lock ; | |
| 4604 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4605 if (ReleaseAfter != NULL) { | |
| 4606 ParkEvent::Release (ReleaseAfter) ; | |
| 4607 } | |
| 4608 return ; | |
| 4609 } | |
| 4610 } | |
| 4611 | |
| 4612 ev->reset() ; | |
| 4613 ev->OnList = intptr_t(Lock) ; | |
| 4614 // The following fence() isn't _strictly necessary as the subsequent | |
| 4615 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4616 OrderAccess::fence(); | |
| 4617 for (;;) { | |
| 4618 w = *Lock ; | |
| 4619 if ((w & LOCKBIT) == 0) { | |
| 4620 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4621 ev->OnList = 0 ; | |
| 4622 // We call ::Release while holding the outer lock, thus | |
| 4623 // artificially lengthening the critical section. | |
| 4624 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4625 // after we've dropped the outer lock. | |
| 4626 if (ReleaseAfter != NULL) { | |
| 4627 ParkEvent::Release (ReleaseAfter) ; | |
| 4628 } | |
| 4629 return ; | |
| 4630 } | |
| 4631 continue ; // Interference -- *Lock changed -- Just retry | |
| 4632 } | |
| 4633 assert (w & LOCKBIT, "invariant") ; | |
| 4634 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4635 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4636 } | |
| 4637 | |
| 4638 while (ev->OnList != 0) { | |
| 4639 ev->park() ; | |
| 4640 } | |
| 4641 } | |
| 4642 } | |
| 4643 | |
| 4644 // Release() must extract a successor from the list and then wake that thread. | |
| 4645 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4646 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4647 // Release() would : | |
| 4648 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4649 // (B) Extract a successor from the private list "in-hand" | |
| 4650 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4651 // If there were any newly arrived threads and the CAS() would fail. | |
| 4652 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4653 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4654 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4655 // The wakee would be responsible for reattaching and remerging before it | |
| 4656 // competed for the lock. | |
| 4657 // | |
| 4658 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4659 // multiple concurrent pushers, but only one popper or detacher. | |
| 4660 // This implementation pops from the head of the list. This is unfair, | |
| 4661 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4662 // (We wake recently run threads first). | |
| 4663 | |
| 4664 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4665 for (;;) { | |
| 4666 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4667 assert (w & LOCKBIT, "invariant") ; | |
| 4668 if (w == LOCKBIT) return ; | |
| 4669 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4670 assert (List != NULL, "invariant") ; | |
| 4671 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4672 ParkEvent * nxt = List->ListNext ; | |
| 4673 | |
| 4674 // The following CAS() releases the lock and pops the head element. | |
| 4675 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4676 continue ; | |
| 4677 } | |
| 4678 List->OnList = 0 ; | |
| 4679 OrderAccess::fence() ; | |
| 4680 List->unpark () ; | |
| 4681 return ; | |
| 4682 } | |
| 4683 } | |
| 4684 | |
| 4685 | |
| 0 | 4686 void Threads::verify() { |
| 4687 ALL_JAVA_THREADS(p) { | |
| 4688 p->verify(); | |
| 4689 } | |
| 4690 VMThread* thread = VMThread::vm_thread(); | |
| 4691 if (thread != NULL) thread->verify(); | |
| 4692 } |