Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 3799:48048b59a551
7061204: clean the chunk table synchronously in embedded builds
Reviewed-by: dholmes, never, jwilhelm, kvn
| author | jcoomes |
|---|---|
| date | Wed, 06 Jul 2011 12:28:07 -0700 |
| parents | ef2d1b8f2dd4 |
| children | c124e2e7463e |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" |
| 1972 | 36 #include "memory/oopFactory.hpp" |
| 37 #include "memory/universe.inline.hpp" | |
| 38 #include "oops/instanceKlass.hpp" | |
| 39 #include "oops/objArrayOop.hpp" | |
| 40 #include "oops/oop.inline.hpp" | |
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41 #include "oops/symbol.hpp" |
| 1972 | 42 #include "prims/jvm_misc.hpp" |
| 43 #include "prims/jvmtiExport.hpp" | |
| 44 #include "prims/jvmtiThreadState.hpp" | |
| 45 #include "prims/privilegedStack.hpp" | |
| 46 #include "runtime/aprofiler.hpp" | |
| 47 #include "runtime/arguments.hpp" | |
| 48 #include "runtime/biasedLocking.hpp" | |
| 49 #include "runtime/deoptimization.hpp" | |
| 50 #include "runtime/fprofiler.hpp" | |
| 51 #include "runtime/frame.inline.hpp" | |
| 52 #include "runtime/init.hpp" | |
| 53 #include "runtime/interfaceSupport.hpp" | |
| 54 #include "runtime/java.hpp" | |
| 55 #include "runtime/javaCalls.hpp" | |
| 56 #include "runtime/jniPeriodicChecker.hpp" | |
| 57 #include "runtime/memprofiler.hpp" | |
| 58 #include "runtime/mutexLocker.hpp" | |
| 59 #include "runtime/objectMonitor.hpp" | |
| 60 #include "runtime/osThread.hpp" | |
| 61 #include "runtime/safepoint.hpp" | |
| 62 #include "runtime/sharedRuntime.hpp" | |
| 63 #include "runtime/statSampler.hpp" | |
| 64 #include "runtime/stubRoutines.hpp" | |
| 65 #include "runtime/task.hpp" | |
| 66 #include "runtime/threadCritical.hpp" | |
| 67 #include "runtime/threadLocalStorage.hpp" | |
| 68 #include "runtime/vframe.hpp" | |
| 69 #include "runtime/vframeArray.hpp" | |
| 70 #include "runtime/vframe_hp.hpp" | |
| 71 #include "runtime/vmThread.hpp" | |
| 72 #include "runtime/vm_operations.hpp" | |
| 73 #include "services/attachListener.hpp" | |
| 74 #include "services/management.hpp" | |
| 75 #include "services/threadService.hpp" | |
| 76 #include "utilities/defaultStream.hpp" | |
| 77 #include "utilities/dtrace.hpp" | |
| 78 #include "utilities/events.hpp" | |
| 79 #include "utilities/preserveException.hpp" | |
| 80 #ifdef TARGET_OS_FAMILY_linux | |
| 81 # include "os_linux.inline.hpp" | |
| 82 # include "thread_linux.inline.hpp" | |
| 83 #endif | |
| 84 #ifdef TARGET_OS_FAMILY_solaris | |
| 85 # include "os_solaris.inline.hpp" | |
| 86 # include "thread_solaris.inline.hpp" | |
| 87 #endif | |
| 88 #ifdef TARGET_OS_FAMILY_windows | |
| 89 # include "os_windows.inline.hpp" | |
| 90 # include "thread_windows.inline.hpp" | |
| 91 #endif | |
| 92 #ifndef SERIALGC | |
| 93 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 94 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 95 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 96 #endif | |
| 97 #ifdef COMPILER1 | |
| 98 #include "c1/c1_Compiler.hpp" | |
| 99 #endif | |
| 100 #ifdef COMPILER2 | |
| 101 #include "opto/c2compiler.hpp" | |
| 102 #include "opto/idealGraphPrinter.hpp" | |
| 103 #endif | |
| 0 | 104 |
| 105 #ifdef DTRACE_ENABLED | |
| 106 | |
| 107 // Only bother with this argument setup if dtrace is available | |
| 108 | |
| 109 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
| 110 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 111 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 112 intptr_t, intptr_t, bool); | |
| 113 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 114 intptr_t, intptr_t, bool); | |
| 115 | |
| 116 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 117 { \ | |
| 118 ResourceMark rm(this); \ | |
| 119 int len = 0; \ | |
| 120 const char* name = (javathread)->get_thread_name(); \ | |
| 121 len = strlen(name); \ | |
| 122 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 123 name, len, \ | |
| 124 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 125 (javathread)->osthread()->thread_id(), \ | |
| 126 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 127 } | |
| 128 | |
| 129 #else // ndef DTRACE_ENABLED | |
| 130 | |
| 131 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 132 | |
| 133 #endif // ndef DTRACE_ENABLED | |
| 134 | |
| 135 // Class hierarchy | |
| 136 // - Thread | |
| 137 // - VMThread | |
| 138 // - WatcherThread | |
| 139 // - ConcurrentMarkSweepThread | |
| 140 // - JavaThread | |
| 141 // - CompilerThread | |
| 142 | |
| 143 // ======= Thread ======== | |
| 144 | |
| 145 // Support for forcing alignment of thread objects for biased locking | |
| 146 void* Thread::operator new(size_t size) { | |
| 147 if (UseBiasedLocking) { | |
| 148 const int alignment = markOopDesc::biased_lock_alignment; | |
| 149 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 150 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 151 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 152 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 153 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 154 "JavaThread alignment code overflowed allocated storage"); | |
| 155 if (TraceBiasedLocking) { | |
| 156 if (aligned_addr != real_malloc_addr) | |
| 157 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 158 real_malloc_addr, aligned_addr); | |
| 159 } | |
| 160 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 161 return aligned_addr; | |
| 162 } else { | |
| 163 return CHeapObj::operator new(size); | |
| 164 } | |
| 165 } | |
| 166 | |
| 167 void Thread::operator delete(void* p) { | |
| 168 if (UseBiasedLocking) { | |
| 169 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 170 CHeapObj::operator delete(real_malloc_addr); | |
| 171 } else { | |
| 172 CHeapObj::operator delete(p); | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 | |
| 177 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 178 // JavaThread | |
| 179 | |
| 180 | |
| 181 Thread::Thread() { | |
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182 // stack and get_thread |
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183 set_stack_base(NULL); |
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184 set_stack_size(0); |
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185 set_self_raw_id(0); |
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186 set_lgrp_id(-1); |
| 0 | 187 |
| 188 // allocated data structures | |
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189 set_osthread(NULL); |
| 0 | 190 set_resource_area(new ResourceArea()); |
| 191 set_handle_area(new HandleArea(NULL)); | |
| 192 set_active_handles(NULL); | |
| 193 set_free_handle_block(NULL); | |
| 194 set_last_handle_mark(NULL); | |
| 195 | |
| 196 // This initial value ==> never claimed. | |
| 197 _oops_do_parity = 0; | |
| 198 | |
| 199 // the handle mark links itself to last_handle_mark | |
| 200 new HandleMark(this); | |
| 201 | |
| 202 // plain initialization | |
| 203 debug_only(_owned_locks = NULL;) | |
| 204 debug_only(_allow_allocation_count = 0;) | |
| 205 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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206 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 207 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 208 _jvmti_env_iteration_count = 0; | |
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209 set_allocated_bytes(0); |
| 0 | 210 _vm_operation_started_count = 0; |
| 211 _vm_operation_completed_count = 0; | |
| 212 _current_pending_monitor = NULL; | |
| 213 _current_pending_monitor_is_from_java = true; | |
| 214 _current_waiting_monitor = NULL; | |
| 215 _num_nested_signal = 0; | |
| 216 omFreeList = NULL ; | |
| 217 omFreeCount = 0 ; | |
| 218 omFreeProvision = 32 ; | |
| 1587 | 219 omInUseList = NULL ; |
| 220 omInUseCount = 0 ; | |
| 0 | 221 |
| 222 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 223 _suspend_flags = 0; | |
| 224 | |
| 225 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 226 _hashStateX = os::random() ; | |
| 227 _hashStateY = 842502087 ; | |
| 228 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 229 _hashStateW = 273326509 ; | |
| 230 | |
| 231 _OnTrap = 0 ; | |
| 232 _schedctl = NULL ; | |
| 233 _Stalled = 0 ; | |
| 234 _TypeTag = 0x2BAD ; | |
| 235 | |
| 236 // Many of the following fields are effectively final - immutable | |
| 237 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 238 // construct until the _MutexEvent is initialized ... | |
| 239 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 240 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 241 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 242 // and ::Release() | |
| 243 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 244 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 245 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 246 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 247 | |
| 248 #ifdef CHECK_UNHANDLED_OOPS | |
| 249 if (CheckUnhandledOops) { | |
| 250 _unhandled_oops = new UnhandledOops(this); | |
| 251 } | |
| 252 #endif // CHECK_UNHANDLED_OOPS | |
| 253 #ifdef ASSERT | |
| 254 if (UseBiasedLocking) { | |
| 255 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 256 assert(this == _real_malloc_address || | |
| 257 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 258 "bug in forced alignment of thread objects"); | |
| 259 } | |
| 260 #endif /* ASSERT */ | |
| 261 } | |
| 262 | |
| 263 void Thread::initialize_thread_local_storage() { | |
| 264 // Note: Make sure this method only calls | |
| 265 // non-blocking operations. Otherwise, it might not work | |
| 266 // with the thread-startup/safepoint interaction. | |
| 267 | |
| 268 // During Java thread startup, safepoint code should allow this | |
| 269 // method to complete because it may need to allocate memory to | |
| 270 // store information for the new thread. | |
| 271 | |
| 272 // initialize structure dependent on thread local storage | |
| 273 ThreadLocalStorage::set_thread(this); | |
| 274 | |
| 275 // set up any platform-specific state. | |
| 276 os::initialize_thread(); | |
| 277 | |
| 278 } | |
| 279 | |
| 280 void Thread::record_stack_base_and_size() { | |
| 281 set_stack_base(os::current_stack_base()); | |
| 282 set_stack_size(os::current_stack_size()); | |
| 283 } | |
| 284 | |
| 285 | |
| 286 Thread::~Thread() { | |
| 287 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 288 ObjectSynchronizer::omFlush (this) ; | |
| 289 | |
| 290 // deallocate data structures | |
| 291 delete resource_area(); | |
| 292 // since the handle marks are using the handle area, we have to deallocated the root | |
| 293 // handle mark before deallocating the thread's handle area, | |
| 294 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 295 delete last_handle_mark(); | |
| 296 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 297 | |
| 298 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 299 // We NULL out the fields for good hygiene. | |
| 300 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 301 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 302 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 303 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 304 | |
| 305 delete handle_area(); | |
| 306 | |
| 307 // osthread() can be NULL, if creation of thread failed. | |
| 308 if (osthread() != NULL) os::free_thread(osthread()); | |
| 309 | |
| 310 delete _SR_lock; | |
| 311 | |
| 312 // clear thread local storage if the Thread is deleting itself | |
| 313 if (this == Thread::current()) { | |
| 314 ThreadLocalStorage::set_thread(NULL); | |
| 315 } else { | |
| 316 // In the case where we're not the current thread, invalidate all the | |
| 317 // caches in case some code tries to get the current thread or the | |
| 318 // thread that was destroyed, and gets stale information. | |
| 319 ThreadLocalStorage::invalidate_all(); | |
| 320 } | |
| 321 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 322 } | |
| 323 | |
| 324 // NOTE: dummy function for assertion purpose. | |
| 325 void Thread::run() { | |
| 326 ShouldNotReachHere(); | |
| 327 } | |
| 328 | |
| 329 #ifdef ASSERT | |
| 330 // Private method to check for dangling thread pointer | |
| 331 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 332 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 333 "possibility of dangling Thread pointer"); | |
| 334 } | |
| 335 #endif | |
| 336 | |
| 337 | |
| 338 #ifndef PRODUCT | |
| 339 // Tracing method for basic thread operations | |
| 340 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 341 if (!TraceThreadEvents) return; | |
| 342 ResourceMark rm; | |
| 343 ThreadCritical tc; | |
| 344 const char *name = "non-Java thread"; | |
| 345 int prio = -1; | |
| 346 if (thread->is_Java_thread() | |
| 347 && !thread->is_Compiler_thread()) { | |
| 348 // The Threads_lock must be held to get information about | |
| 349 // this thread but may not be in some situations when | |
| 350 // tracing thread events. | |
| 351 bool release_Threads_lock = false; | |
| 352 if (!Threads_lock->owned_by_self()) { | |
| 353 Threads_lock->lock(); | |
| 354 release_Threads_lock = true; | |
| 355 } | |
| 356 JavaThread* jt = (JavaThread *)thread; | |
| 357 name = (char *)jt->get_thread_name(); | |
| 358 oop thread_oop = jt->threadObj(); | |
| 359 if (thread_oop != NULL) { | |
| 360 prio = java_lang_Thread::priority(thread_oop); | |
| 361 } | |
| 362 if (release_Threads_lock) { | |
| 363 Threads_lock->unlock(); | |
| 364 } | |
| 365 } | |
| 366 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 367 } | |
| 368 #endif | |
| 369 | |
| 370 | |
| 371 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 372 trace("get priority", thread); | |
| 373 ThreadPriority priority; | |
| 374 // Can return an error! | |
| 375 (void)os::get_priority(thread, priority); | |
| 376 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 377 return priority; | |
| 378 } | |
| 379 | |
| 380 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 381 trace("set priority", thread); | |
| 382 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 383 // Can return an error! | |
| 384 (void)os::set_priority(thread, priority); | |
| 385 } | |
| 386 | |
| 387 | |
| 388 void Thread::start(Thread* thread) { | |
| 389 trace("start", thread); | |
| 390 // Start is different from resume in that its safety is guaranteed by context or | |
| 391 // being called from a Java method synchronized on the Thread object. | |
| 392 if (!DisableStartThread) { | |
| 393 if (thread->is_Java_thread()) { | |
| 394 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 395 // Can not set it after the thread started because we do not know the | |
| 396 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 397 // in SLEEPING or some other state. | |
| 398 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 399 java_lang_Thread::RUNNABLE); | |
| 400 } | |
| 401 os::start_thread(thread); | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 406 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 407 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 408 VMThread::execute(vm_stop); | |
| 409 } | |
| 410 | |
| 411 | |
| 412 // | |
| 413 // Check if an external suspend request has completed (or has been | |
| 414 // cancelled). Returns true if the thread is externally suspended and | |
| 415 // false otherwise. | |
| 416 // | |
| 417 // The bits parameter returns information about the code path through | |
| 418 // the routine. Useful for debugging: | |
| 419 // | |
| 420 // set in is_ext_suspend_completed(): | |
| 421 // 0x00000001 - routine was entered | |
| 422 // 0x00000010 - routine return false at end | |
| 423 // 0x00000100 - thread exited (return false) | |
| 424 // 0x00000200 - suspend request cancelled (return false) | |
| 425 // 0x00000400 - thread suspended (return true) | |
| 426 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 427 // 0x00002000 - thread is native and walkable (return true) | |
| 428 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 429 // | |
| 430 // set in wait_for_ext_suspend_completion(): | |
| 431 // 0x00010000 - routine was entered | |
| 432 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 433 // 0x00040000 - thread suspended before loop (return true) | |
| 434 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 435 // 0x00100000 - thread suspended in loop (return true) | |
| 436 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 437 // | |
| 438 | |
| 439 // Helper class for tracing suspend wait debug bits. | |
| 440 // | |
| 441 // 0x00000100 indicates that the target thread exited before it could | |
| 442 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 443 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 444 // count as wait failures either. | |
| 445 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 446 | |
| 447 class TraceSuspendDebugBits : public StackObj { | |
| 448 private: | |
| 449 JavaThread * jt; | |
| 450 bool is_wait; | |
| 451 bool called_by_wait; // meaningful when !is_wait | |
| 452 uint32_t * bits; | |
| 453 | |
| 454 public: | |
| 455 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 456 uint32_t *_bits) { | |
| 457 jt = _jt; | |
| 458 is_wait = _is_wait; | |
| 459 called_by_wait = _called_by_wait; | |
| 460 bits = _bits; | |
| 461 } | |
| 462 | |
| 463 ~TraceSuspendDebugBits() { | |
| 464 if (!is_wait) { | |
| 465 #if 1 | |
| 466 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 467 // That trace is very chatty. | |
| 468 return; | |
| 469 #else | |
| 470 if (!called_by_wait) { | |
| 471 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 472 // trace calls to it from wait_for_ext_suspend_completion() | |
| 473 return; | |
| 474 } | |
| 475 #endif | |
| 476 } | |
| 477 | |
| 478 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 479 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 480 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 481 ResourceMark rm; | |
| 482 | |
| 483 tty->print_cr( | |
| 484 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 485 jt->get_thread_name(), *bits); | |
| 486 | |
| 487 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 488 } | |
| 489 } | |
| 490 } | |
| 491 }; | |
| 492 #undef DEBUG_FALSE_BITS | |
| 493 | |
| 494 | |
| 495 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 496 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 497 | |
| 498 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 499 bool do_trans_retry; // flag to force the retry | |
| 500 | |
| 501 *bits |= 0x00000001; | |
| 502 | |
| 503 do { | |
| 504 do_trans_retry = false; | |
| 505 | |
| 506 if (is_exiting()) { | |
| 507 // Thread is in the process of exiting. This is always checked | |
| 508 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 509 *bits |= 0x00000100; | |
| 510 return false; | |
| 511 } | |
| 512 | |
| 513 if (!is_external_suspend()) { | |
| 514 // Suspend request is cancelled. This is always checked before | |
| 515 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 516 // confusing the thread that made the suspend request. | |
| 517 *bits |= 0x00000200; | |
| 518 return false; | |
| 519 } | |
| 520 | |
| 521 if (is_ext_suspended()) { | |
| 522 // thread is suspended | |
| 523 *bits |= 0x00000400; | |
| 524 return true; | |
| 525 } | |
| 526 | |
| 527 // Now that we no longer do hard suspends of threads running | |
| 528 // native code, the target thread can be changing thread state | |
| 529 // while we are in this routine: | |
| 530 // | |
| 531 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 532 // | |
| 533 // We save a copy of the thread state as observed at this moment | |
| 534 // and make our decision about suspend completeness based on the | |
| 535 // copy. This closes the race where the thread state is seen as | |
| 536 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 537 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 538 JavaThreadState save_state = thread_state(); | |
| 539 | |
| 540 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 541 // If the thread's state is _thread_blocked and this blocking | |
| 542 // condition is known to be equivalent to a suspend, then we can | |
| 543 // consider the thread to be externally suspended. This means that | |
| 544 // the code that sets _thread_blocked has been modified to do | |
| 545 // self-suspension if the blocking condition releases. We also | |
| 546 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 547 // the _thread_blocked with self-suspension check. | |
| 548 // | |
| 549 // Return true since we wouldn't be here unless there was still an | |
| 550 // external suspend request. | |
| 551 *bits |= 0x00001000; | |
| 552 return true; | |
| 553 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 554 // Threads running native code will self-suspend on native==>VM/Java | |
| 555 // transitions. If its stack is walkable (should always be the case | |
| 556 // unless this function is called before the actual java_suspend() | |
| 557 // call), then the wait is done. | |
| 558 *bits |= 0x00002000; | |
| 559 return true; | |
| 560 } else if (!called_by_wait && !did_trans_retry && | |
| 561 save_state == _thread_in_native_trans && | |
| 562 frame_anchor()->walkable()) { | |
| 563 // The thread is transitioning from thread_in_native to another | |
| 564 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 565 // will force the thread to self-suspend. If it hasn't gotten | |
| 566 // there yet we may have caught the thread in-between the native | |
| 567 // code check above and the self-suspend. Lucky us. If we were | |
| 568 // called by wait_for_ext_suspend_completion(), then it | |
| 569 // will be doing the retries so we don't have to. | |
| 570 // | |
| 571 // Since we use the saved thread state in the if-statement above, | |
| 572 // there is a chance that the thread has already transitioned to | |
| 573 // _thread_blocked by the time we get here. In that case, we will | |
| 574 // make a single unnecessary pass through the logic below. This | |
| 575 // doesn't hurt anything since we still do the trans retry. | |
| 576 | |
| 577 *bits |= 0x00004000; | |
| 578 | |
| 579 // Once the thread leaves thread_in_native_trans for another | |
| 580 // thread state, we break out of this retry loop. We shouldn't | |
| 581 // need this flag to prevent us from getting back here, but | |
| 582 // sometimes paranoia is good. | |
| 583 did_trans_retry = true; | |
| 584 | |
| 585 // We wait for the thread to transition to a more usable state. | |
| 586 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 587 // We used to do an "os::yield_all(i)" call here with the intention | |
| 588 // that yielding would increase on each retry. However, the parameter | |
| 589 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 590 // on the SR_lock below provides a much more predictable scale up for | |
| 591 // the delay. It also provides a simple/direct point to check for any | |
| 592 // safepoint requests from the VMThread | |
| 593 | |
| 594 // temporarily drops SR_lock while doing wait with safepoint check | |
| 595 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 596 // and increase delay with each retry | |
| 597 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 598 | |
| 599 // check the actual thread state instead of what we saved above | |
| 600 if (thread_state() != _thread_in_native_trans) { | |
| 601 // the thread has transitioned to another thread state so | |
| 602 // try all the checks (except this one) one more time. | |
| 603 do_trans_retry = true; | |
| 604 break; | |
| 605 } | |
| 606 } // end retry loop | |
| 607 | |
| 608 | |
| 609 } | |
| 610 } while (do_trans_retry); | |
| 611 | |
| 612 *bits |= 0x00000010; | |
| 613 return false; | |
| 614 } | |
| 615 | |
| 616 // | |
| 617 // Wait for an external suspend request to complete (or be cancelled). | |
| 618 // Returns true if the thread is externally suspended and false otherwise. | |
| 619 // | |
| 620 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 621 uint32_t *bits) { | |
| 622 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 623 false /* !called_by_wait */, bits); | |
| 624 | |
| 625 // local flag copies to minimize SR_lock hold time | |
| 626 bool is_suspended; | |
| 627 bool pending; | |
| 628 uint32_t reset_bits; | |
| 629 | |
| 630 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 631 *bits |= 0x00010000; | |
| 632 | |
| 633 // We use reset_bits to reinitialize the bits value at the top of | |
| 634 // each retry loop. This allows the caller to make use of any | |
| 635 // unused bits for their own marking purposes. | |
| 636 reset_bits = *bits; | |
| 637 | |
| 638 { | |
| 639 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 640 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 641 delay, bits); | |
| 642 pending = is_external_suspend(); | |
| 643 } | |
| 644 // must release SR_lock to allow suspension to complete | |
| 645 | |
| 646 if (!pending) { | |
| 647 // A cancelled suspend request is the only false return from | |
| 648 // is_ext_suspend_completed() that keeps us from entering the | |
| 649 // retry loop. | |
| 650 *bits |= 0x00020000; | |
| 651 return false; | |
| 652 } | |
| 653 | |
| 654 if (is_suspended) { | |
| 655 *bits |= 0x00040000; | |
| 656 return true; | |
| 657 } | |
| 658 | |
| 659 for (int i = 1; i <= retries; i++) { | |
| 660 *bits = reset_bits; // reinit to only track last retry | |
| 661 | |
| 662 // We used to do an "os::yield_all(i)" call here with the intention | |
| 663 // that yielding would increase on each retry. However, the parameter | |
| 664 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 665 // on the SR_lock below provides a much more predictable scale up for | |
| 666 // the delay. It also provides a simple/direct point to check for any | |
| 667 // safepoint requests from the VMThread | |
| 668 | |
| 669 { | |
| 670 MutexLocker ml(SR_lock()); | |
| 671 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 672 // can also call this) and increase delay with each retry | |
| 673 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 674 | |
| 675 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 676 delay, bits); | |
| 677 | |
| 678 // It is possible for the external suspend request to be cancelled | |
| 679 // (by a resume) before the actual suspend operation is completed. | |
| 680 // Refresh our local copy to see if we still need to wait. | |
| 681 pending = is_external_suspend(); | |
| 682 } | |
| 683 | |
| 684 if (!pending) { | |
| 685 // A cancelled suspend request is the only false return from | |
| 686 // is_ext_suspend_completed() that keeps us from staying in the | |
| 687 // retry loop. | |
| 688 *bits |= 0x00080000; | |
| 689 return false; | |
| 690 } | |
| 691 | |
| 692 if (is_suspended) { | |
| 693 *bits |= 0x00100000; | |
| 694 return true; | |
| 695 } | |
| 696 } // end retry loop | |
| 697 | |
| 698 // thread did not suspend after all our retries | |
| 699 *bits |= 0x00200000; | |
| 700 return false; | |
| 701 } | |
| 702 | |
| 703 #ifndef PRODUCT | |
| 704 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 705 | |
| 706 // This should not need to be atomic as the only way for simultaneous | |
| 707 // updates is via interrupts. Even then this should be rare or non-existant | |
| 708 // and we don't care that much anyway. | |
| 709 | |
| 710 int index = _jmp_ring_index; | |
| 711 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 712 _jmp_ring[index]._target = (intptr_t) target; | |
| 713 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 714 _jmp_ring[index]._file = file; | |
| 715 _jmp_ring[index]._line = line; | |
| 716 } | |
| 717 #endif /* PRODUCT */ | |
| 718 | |
| 719 // Called by flat profiler | |
| 720 // Callers have already called wait_for_ext_suspend_completion | |
| 721 // The assertion for that is currently too complex to put here: | |
| 722 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 723 bool gotframe = false; | |
| 724 // self suspension saves needed state. | |
| 725 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 726 *_fr = pd_last_frame(); | |
| 727 gotframe = true; | |
| 728 } | |
| 729 return gotframe; | |
| 730 } | |
| 731 | |
| 732 void Thread::interrupt(Thread* thread) { | |
| 733 trace("interrupt", thread); | |
| 734 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 735 os::interrupt(thread); | |
| 736 } | |
| 737 | |
| 738 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 739 trace("is_interrupted", thread); | |
| 740 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 741 // Note: If clear_interrupted==false, this simply fetches and | |
| 742 // returns the value of the field osthread()->interrupted(). | |
| 743 return os::is_interrupted(thread, clear_interrupted); | |
| 744 } | |
| 745 | |
| 746 | |
| 747 // GC Support | |
| 748 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 749 jint thread_parity = _oops_do_parity; | |
| 750 if (thread_parity != strong_roots_parity) { | |
| 751 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
| 752 if (res == thread_parity) return true; | |
| 753 else { | |
| 754 guarantee(res == strong_roots_parity, "Or else what?"); | |
| 755 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 756 "Should only fail when parallel."); | |
| 757 return false; | |
| 758 } | |
| 759 } | |
| 760 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 761 "Should only fail when parallel."); | |
| 762 return false; | |
| 763 } | |
| 764 | |
|
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765 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 766 active_handles()->oops_do(f); |
| 767 // Do oop for ThreadShadow | |
| 768 f->do_oop((oop*)&_pending_exception); | |
| 769 handle_area()->oops_do(f); | |
| 770 } | |
| 771 | |
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772 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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773 // no nmethods in a generic thread... |
| 0 | 774 } |
| 775 | |
| 776 void Thread::print_on(outputStream* st) const { | |
| 777 // get_priority assumes osthread initialized | |
| 778 if (osthread() != NULL) { | |
| 779 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 780 osthread()->print_on(st); | |
| 781 } | |
| 782 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 783 } | |
| 784 | |
| 785 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 786 // any lock or allocate memory. | |
| 787 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 788 if (is_VM_thread()) st->print("VMThread"); | |
| 789 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 790 else if (is_Java_thread()) st->print("JavaThread"); | |
| 791 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 792 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 793 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 794 else st->print("Thread"); | |
| 795 | |
| 796 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 797 _stack_base - _stack_size, _stack_base); | |
| 798 | |
| 799 if (osthread()) { | |
| 800 st->print(" [id=%d]", osthread()->thread_id()); | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 #ifdef ASSERT | |
| 805 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 806 Monitor *cur = _owned_locks; | |
| 807 if (cur == NULL) { | |
| 808 st->print(" (no locks) "); | |
| 809 } else { | |
| 810 st->print_cr(" Locks owned:"); | |
| 811 while(cur) { | |
| 812 cur->print_on(st); | |
| 813 cur = cur->next(); | |
| 814 } | |
| 815 } | |
| 816 } | |
| 817 | |
| 818 static int ref_use_count = 0; | |
| 819 | |
| 820 bool Thread::owns_locks_but_compiled_lock() const { | |
| 821 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 822 if (cur != Compile_lock) return true; | |
| 823 } | |
| 824 return false; | |
| 825 } | |
| 826 | |
| 827 | |
| 828 #endif | |
| 829 | |
| 830 #ifndef PRODUCT | |
| 831 | |
| 832 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 833 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 834 // no threads which allow_vm_block's are held | |
| 835 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 836 // Check if current thread is allowed to block at a safepoint | |
| 837 if (!(_allow_safepoint_count == 0)) | |
| 838 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 839 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 840 fatal("LEAF method calling lock?"); | |
| 841 } | |
| 842 | |
| 843 #ifdef ASSERT | |
| 844 if (potential_vm_operation && is_Java_thread() | |
| 845 && !Universe::is_bootstrapping()) { | |
| 846 // Make sure we do not hold any locks that the VM thread also uses. | |
| 847 // This could potentially lead to deadlocks | |
| 848 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 849 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 850 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 851 // since it is used to transfer control between JavaThreads and the VMThread | |
| 852 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 853 if ( (cur->allow_vm_block() && | |
| 854 cur != Threads_lock && | |
| 855 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 856 cur != VMOperationRequest_lock && | |
| 857 cur != VMOperationQueue_lock) || | |
| 858 cur->rank() == Mutex::special) { | |
| 859 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 860 } | |
| 861 } | |
| 862 } | |
| 863 | |
| 864 if (GCALotAtAllSafepoints) { | |
| 865 // We could enter a safepoint here and thus have a gc | |
| 866 InterfaceSupport::check_gc_alot(); | |
| 867 } | |
| 868 #endif | |
| 869 } | |
| 870 #endif | |
| 871 | |
| 872 bool Thread::is_in_stack(address adr) const { | |
| 873 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 874 address end = os::current_stack_pointer(); | |
| 875 if (stack_base() >= adr && adr >= end) return true; | |
| 876 | |
| 877 return false; | |
| 878 } | |
| 879 | |
| 880 | |
| 881 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 882 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 883 // used for compilation in the future. If that change is made, the need for these methods | |
| 884 // should be revisited, and they should be removed if possible. | |
| 885 | |
| 886 bool Thread::is_lock_owned(address adr) const { | |
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887 return on_local_stack(adr); |
| 0 | 888 } |
| 889 | |
| 890 bool Thread::set_as_starting_thread() { | |
| 891 // NOTE: this must be called inside the main thread. | |
| 892 return os::create_main_thread((JavaThread*)this); | |
| 893 } | |
| 894 | |
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895 static void initialize_class(Symbol* class_name, TRAPS) { |
| 0 | 896 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
| 897 instanceKlass::cast(klass)->initialize(CHECK); | |
| 898 } | |
| 899 | |
| 900 | |
| 901 // Creates the initial ThreadGroup | |
| 902 static Handle create_initial_thread_group(TRAPS) { | |
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903 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 904 instanceKlassHandle klass (THREAD, k); |
| 905 | |
| 906 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 907 { | |
| 908 JavaValue result(T_VOID); | |
| 909 JavaCalls::call_special(&result, | |
| 910 system_instance, | |
| 911 klass, | |
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912 vmSymbols::object_initializer_name(), |
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913 vmSymbols::void_method_signature(), |
| 0 | 914 CHECK_NH); |
| 915 } | |
| 916 Universe::set_system_thread_group(system_instance()); | |
| 917 | |
| 918 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 919 { | |
| 920 JavaValue result(T_VOID); | |
| 921 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 922 JavaCalls::call_special(&result, | |
| 923 main_instance, | |
| 924 klass, | |
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925 vmSymbols::object_initializer_name(), |
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926 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 927 system_instance, |
| 928 string, | |
| 929 CHECK_NH); | |
| 930 } | |
| 931 return main_instance; | |
| 932 } | |
| 933 | |
| 934 // Creates the initial Thread | |
| 935 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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936 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 937 instanceKlassHandle klass (THREAD, k); |
| 938 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 939 | |
| 940 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 941 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 942 thread->set_threadObj(thread_oop()); | |
| 943 | |
| 944 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 945 | |
| 946 JavaValue result(T_VOID); | |
| 947 JavaCalls::call_special(&result, thread_oop, | |
| 948 klass, | |
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949 vmSymbols::object_initializer_name(), |
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950 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 951 thread_group, |
| 952 string, | |
| 953 CHECK_NULL); | |
| 954 return thread_oop(); | |
| 955 } | |
| 956 | |
| 957 static void call_initializeSystemClass(TRAPS) { | |
|
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958 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 959 instanceKlassHandle klass (THREAD, k); |
| 960 | |
| 961 JavaValue result(T_VOID); | |
|
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962 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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963 vmSymbols::void_method_signature(), CHECK); |
| 0 | 964 } |
| 965 | |
|
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966 // General purpose hook into Java code, run once when the VM is initialized. |
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967 // The Java library method itself may be changed independently from the VM. |
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968 static void call_postVMInitHook(TRAPS) { |
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969 klassOop k = SystemDictionary::sun_misc_PostVMInitHook_klass(); |
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970 instanceKlassHandle klass (THREAD, k); |
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971 if (klass.not_null()) { |
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972 JavaValue result(T_VOID); |
|
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973 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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974 vmSymbols::void_method_signature(), |
|
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975 CHECK); |
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976 } |
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977 } |
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978 |
| 0 | 979 static void reset_vm_info_property(TRAPS) { |
| 980 // the vm info string | |
| 981 ResourceMark rm(THREAD); | |
| 982 const char *vm_info = VM_Version::vm_info_string(); | |
| 983 | |
| 984 // java.lang.System class | |
|
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985 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 986 instanceKlassHandle klass (THREAD, k); |
| 987 | |
| 988 // setProperty arguments | |
| 989 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 990 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 991 | |
| 992 // return value | |
| 993 JavaValue r(T_OBJECT); | |
| 994 | |
| 995 // public static String setProperty(String key, String value); | |
| 996 JavaCalls::call_static(&r, | |
| 997 klass, | |
|
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998 vmSymbols::setProperty_name(), |
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999 vmSymbols::string_string_string_signature(), |
| 0 | 1000 key_str, |
| 1001 value_str, | |
| 1002 CHECK); | |
| 1003 } | |
| 1004 | |
| 1005 | |
| 1006 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1007 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1008 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1009 | |
|
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1010 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1011 instanceKlassHandle klass (THREAD, k); |
| 1012 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1013 | |
| 1014 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1015 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1016 set_threadObj(thread_oop()); | |
| 1017 | |
| 1018 JavaValue result(T_VOID); | |
| 1019 if (thread_name != NULL) { | |
| 1020 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1021 // Thread gets assigned specified name and null target | |
| 1022 JavaCalls::call_special(&result, | |
| 1023 thread_oop, | |
| 1024 klass, | |
|
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1025 vmSymbols::object_initializer_name(), |
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1026 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1027 thread_group, // Argument 1 |
| 1028 name, // Argument 2 | |
| 1029 THREAD); | |
| 1030 } else { | |
| 1031 // Thread gets assigned name "Thread-nnn" and null target | |
| 1032 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1033 JavaCalls::call_special(&result, | |
| 1034 thread_oop, | |
| 1035 klass, | |
|
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1036 vmSymbols::object_initializer_name(), |
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1037 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1038 thread_group, // Argument 1 |
| 1039 Handle(), // Argument 2 | |
| 1040 THREAD); | |
| 1041 } | |
| 1042 | |
| 1043 | |
| 1044 if (daemon) { | |
| 1045 java_lang_Thread::set_daemon(thread_oop()); | |
| 1046 } | |
| 1047 | |
| 1048 if (HAS_PENDING_EXCEPTION) { | |
| 1049 return; | |
| 1050 } | |
| 1051 | |
| 1142 | 1052 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1053 Handle threadObj(this, this->threadObj()); |
| 1054 | |
| 1055 JavaCalls::call_special(&result, | |
| 1056 thread_group, | |
| 1057 group, | |
|
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1058 vmSymbols::add_method_name(), |
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1059 vmSymbols::thread_void_signature(), |
| 0 | 1060 threadObj, // Arg 1 |
| 1061 THREAD); | |
| 1062 | |
| 1063 | |
| 1064 } | |
| 1065 | |
| 1066 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1067 // uniquely named instances should derive from this. | |
| 1068 NamedThread::NamedThread() : Thread() { | |
| 1069 _name = NULL; | |
|
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1070 _processed_thread = NULL; |
| 0 | 1071 } |
| 1072 | |
| 1073 NamedThread::~NamedThread() { | |
| 1074 if (_name != NULL) { | |
| 1075 FREE_C_HEAP_ARRAY(char, _name); | |
| 1076 _name = NULL; | |
| 1077 } | |
| 1078 } | |
| 1079 | |
| 1080 void NamedThread::set_name(const char* format, ...) { | |
| 1081 guarantee(_name == NULL, "Only get to set name once."); | |
| 1082 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 1083 guarantee(_name != NULL, "alloc failure"); | |
| 1084 va_list ap; | |
| 1085 va_start(ap, format); | |
| 1086 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1087 va_end(ap); | |
| 1088 } | |
| 1089 | |
| 1090 // ======= WatcherThread ======== | |
| 1091 | |
| 1092 // The watcher thread exists to simulate timer interrupts. It should | |
| 1093 // be replaced by an abstraction over whatever native support for | |
| 1094 // timer interrupts exists on the platform. | |
| 1095 | |
| 1096 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1097 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1098 |
| 1099 WatcherThread::WatcherThread() : Thread() { | |
| 1100 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1101 if (os::create_thread(this, os::watcher_thread)) { | |
| 1102 _watcher_thread = this; | |
| 1103 | |
| 1104 // Set the watcher thread to the highest OS priority which should not be | |
| 1105 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1106 // is created. The only normal thread using this priority is the reference | |
| 1107 // handler thread, which runs for very short intervals only. | |
| 1108 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1109 // will be inaccurate. | |
| 1110 os::set_priority(this, MaxPriority); | |
| 1111 if (!DisableStartThread) { | |
| 1112 os::start_thread(this); | |
| 1113 } | |
| 1114 } | |
| 1115 } | |
| 1116 | |
| 1117 void WatcherThread::run() { | |
| 1118 assert(this == watcher_thread(), "just checking"); | |
| 1119 | |
| 1120 this->record_stack_base_and_size(); | |
| 1121 this->initialize_thread_local_storage(); | |
| 1122 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1123 while(!_should_terminate) { | |
| 1124 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1125 assert(watcher_thread() == this, "thread consistency check"); | |
| 1126 | |
| 1127 // Calculate how long it'll be until the next PeriodicTask work | |
| 1128 // should be done, and sleep that amount of time. | |
|
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1129 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1130 |
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1131 // we expect this to timeout - we only ever get unparked when |
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1132 // we should terminate |
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1133 { |
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1134 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1135 |
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1136 jlong prev_time = os::javaTimeNanos(); |
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1137 for (;;) { |
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1138 int res= _SleepEvent->park(time_to_wait); |
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1139 if (res == OS_TIMEOUT || _should_terminate) |
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1140 break; |
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1141 // spurious wakeup of some kind |
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1142 jlong now = os::javaTimeNanos(); |
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1143 time_to_wait -= (now - prev_time) / 1000000; |
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1144 if (time_to_wait <= 0) |
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1145 break; |
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1146 prev_time = now; |
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1147 } |
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1148 } |
| 0 | 1149 |
| 1150 if (is_error_reported()) { | |
| 1151 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1152 // should abort JVM after creating an error log file. However in some | |
| 1153 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1154 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1155 // | |
| 1156 // This code is in WatcherThread because WatcherThread wakes up | |
| 1157 // periodically so the fatal error handler doesn't need to do anything; | |
| 1158 // also because the WatcherThread is less likely to crash than other | |
| 1159 // threads. | |
| 1160 | |
| 1161 for (;;) { | |
| 1162 if (!ShowMessageBoxOnError | |
| 1163 && (OnError == NULL || OnError[0] == '\0') | |
| 1164 && Arguments::abort_hook() == NULL) { | |
| 1165 os::sleep(this, 2 * 60 * 1000, false); | |
| 1166 fdStream err(defaultStream::output_fd()); | |
| 1167 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1168 // skip atexit/vm_exit/vm_abort hooks | |
| 1169 os::die(); | |
| 1170 } | |
| 1171 | |
| 1172 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1173 // ShowMessageBoxOnError when it is ready to abort. | |
| 1174 os::sleep(this, 5 * 1000, false); | |
| 1175 } | |
| 1176 } | |
| 1177 | |
| 1178 PeriodicTask::real_time_tick(time_to_wait); | |
| 1179 | |
| 1180 // If we have no more tasks left due to dynamic disenrollment, | |
| 1181 // shut down the thread since we don't currently support dynamic enrollment | |
| 1182 if (PeriodicTask::num_tasks() == 0) { | |
| 1183 _should_terminate = true; | |
| 1184 } | |
| 1185 } | |
| 1186 | |
| 1187 // Signal that it is terminated | |
| 1188 { | |
| 1189 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1190 _watcher_thread = NULL; | |
| 1191 Terminator_lock->notify(); | |
| 1192 } | |
| 1193 | |
| 1194 // Thread destructor usually does this.. | |
| 1195 ThreadLocalStorage::set_thread(NULL); | |
| 1196 } | |
| 1197 | |
| 1198 void WatcherThread::start() { | |
| 1199 if (watcher_thread() == NULL) { | |
| 1200 _should_terminate = false; | |
| 1201 // Create the single instance of WatcherThread | |
| 1202 new WatcherThread(); | |
| 1203 } | |
| 1204 } | |
| 1205 | |
| 1206 void WatcherThread::stop() { | |
| 1207 // it is ok to take late safepoints here, if needed | |
| 1208 MutexLocker mu(Terminator_lock); | |
| 1209 _should_terminate = true; | |
|
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1210 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1211 |
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1212 Thread* watcher = watcher_thread(); |
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1213 if (watcher != NULL) |
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1214 watcher->_SleepEvent->unpark(); |
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1215 |
| 0 | 1216 while(watcher_thread() != NULL) { |
| 1217 // This wait should make safepoint checks, wait without a timeout, | |
| 1218 // and wait as a suspend-equivalent condition. | |
| 1219 // | |
| 1220 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1221 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1222 // FlatProfiler task, is waiting for the external suspend request on | |
| 1223 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1224 // eventually timeout, but that takes time. Making this wait a | |
| 1225 // suspend-equivalent condition solves that timeout problem. | |
| 1226 // | |
| 1227 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1228 Mutex::_as_suspend_equivalent_flag); | |
| 1229 } | |
| 1230 } | |
| 1231 | |
| 1232 void WatcherThread::print_on(outputStream* st) const { | |
| 1233 st->print("\"%s\" ", name()); | |
| 1234 Thread::print_on(st); | |
| 1235 st->cr(); | |
| 1236 } | |
| 1237 | |
| 1238 // ======= JavaThread ======== | |
| 1239 | |
| 1240 // A JavaThread is a normal Java thread | |
| 1241 | |
| 1242 void JavaThread::initialize() { | |
| 1243 // Initialize fields | |
|
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1244 |
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1245 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1246 set_claimed_par_id(-1); |
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1247 |
| 0 | 1248 set_saved_exception_pc(NULL); |
| 1249 set_threadObj(NULL); | |
| 1250 _anchor.clear(); | |
| 1251 set_entry_point(NULL); | |
| 1252 set_jni_functions(jni_functions()); | |
| 1253 set_callee_target(NULL); | |
| 1254 set_vm_result(NULL); | |
| 1255 set_vm_result_2(NULL); | |
| 1256 set_vframe_array_head(NULL); | |
| 1257 set_vframe_array_last(NULL); | |
| 1258 set_deferred_locals(NULL); | |
| 1259 set_deopt_mark(NULL); | |
|
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1260 set_deopt_nmethod(NULL); |
| 0 | 1261 clear_must_deopt_id(); |
| 1262 set_monitor_chunks(NULL); | |
| 1263 set_next(NULL); | |
| 1264 set_thread_state(_thread_new); | |
| 1265 _terminated = _not_terminated; | |
| 1266 _privileged_stack_top = NULL; | |
| 1267 _array_for_gc = NULL; | |
| 1268 _suspend_equivalent = false; | |
| 1269 _in_deopt_handler = 0; | |
| 1270 _doing_unsafe_access = false; | |
| 1271 _stack_guard_state = stack_guard_unused; | |
| 1272 _exception_oop = NULL; | |
| 1273 _exception_pc = 0; | |
| 1274 _exception_handler_pc = 0; | |
| 1275 _exception_stack_size = 0; | |
| 1903 | 1276 _is_method_handle_return = 0; |
| 0 | 1277 _jvmti_thread_state= NULL; |
|
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1278 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1279 _jvmti_get_loaded_classes_closure = NULL; |
| 1280 _interp_only_mode = 0; | |
| 1281 _special_runtime_exit_condition = _no_async_condition; | |
| 1282 _pending_async_exception = NULL; | |
| 1283 _is_compiling = false; | |
| 1284 _thread_stat = NULL; | |
| 1285 _thread_stat = new ThreadStatistics(); | |
| 1286 _blocked_on_compilation = false; | |
| 1287 _jni_active_critical = 0; | |
| 1288 _do_not_unlock_if_synchronized = false; | |
| 1289 _cached_monitor_info = NULL; | |
| 1290 _parker = Parker::Allocate(this) ; | |
| 1291 | |
| 1292 #ifndef PRODUCT | |
| 1293 _jmp_ring_index = 0; | |
| 1294 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1295 record_jump(NULL, NULL, NULL, 0); | |
| 1296 } | |
| 1297 #endif /* PRODUCT */ | |
| 1298 | |
| 1299 set_thread_profiler(NULL); | |
| 1300 if (FlatProfiler::is_active()) { | |
| 1301 // This is where we would decide to either give each thread it's own profiler | |
| 1302 // or use one global one from FlatProfiler, | |
| 1303 // or up to some count of the number of profiled threads, etc. | |
| 1304 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1305 pp->engage(); | |
| 1306 set_thread_profiler(pp); | |
| 1307 } | |
| 1308 | |
| 1309 // Setup safepoint state info for this thread | |
| 1310 ThreadSafepointState::create(this); | |
| 1311 | |
| 1312 debug_only(_java_call_counter = 0); | |
| 1313 | |
| 1314 // JVMTI PopFrame support | |
| 1315 _popframe_condition = popframe_inactive; | |
| 1316 _popframe_preserved_args = NULL; | |
| 1317 _popframe_preserved_args_size = 0; | |
| 1318 | |
| 1319 pd_initialize(); | |
| 1320 } | |
| 1321 | |
|
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1322 #ifndef SERIALGC |
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1323 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1324 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1325 #endif // !SERIALGC |
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1326 |
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1327 JavaThread::JavaThread(bool is_attaching) : |
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1328 Thread() |
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1329 #ifndef SERIALGC |
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1330 , _satb_mark_queue(&_satb_mark_queue_set), |
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1331 _dirty_card_queue(&_dirty_card_queue_set) |
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1332 #endif // !SERIALGC |
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1333 { |
| 0 | 1334 initialize(); |
| 1335 _is_attaching = is_attaching; | |
|
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1336 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 0 | 1337 } |
| 1338 | |
| 1339 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1340 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1341 return true; // Stack already guarded or guard pages not needed. | |
| 1342 } | |
| 1343 | |
| 1344 if (register_stack_overflow()) { | |
| 1345 // For those architectures which have separate register and | |
| 1346 // memory stacks, we must check the register stack to see if | |
| 1347 // it has overflowed. | |
| 1348 return false; | |
| 1349 } | |
| 1350 | |
| 1351 // Java code never executes within the yellow zone: the latter is only | |
| 1352 // there to provoke an exception during stack banging. If java code | |
| 1353 // is executing there, either StackShadowPages should be larger, or | |
| 1354 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1355 // when it should. | |
| 1356 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1357 | |
| 1358 enable_stack_yellow_zone(); | |
| 1359 return true; | |
| 1360 } | |
| 1361 | |
| 1362 bool JavaThread::reguard_stack(void) { | |
| 1363 return reguard_stack(os::current_stack_pointer()); | |
| 1364 } | |
| 1365 | |
| 1366 | |
| 1367 void JavaThread::block_if_vm_exited() { | |
| 1368 if (_terminated == _vm_exited) { | |
| 1369 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1370 // we will block here forever | |
| 1371 Threads_lock->lock_without_safepoint_check(); | |
| 1372 ShouldNotReachHere(); | |
| 1373 } | |
| 1374 } | |
| 1375 | |
| 1376 | |
| 1377 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1378 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1379 | |
|
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1380 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1381 Thread() |
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1382 #ifndef SERIALGC |
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1383 , _satb_mark_queue(&_satb_mark_queue_set), |
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1384 _dirty_card_queue(&_dirty_card_queue_set) |
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1385 #endif // !SERIALGC |
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1386 { |
| 0 | 1387 if (TraceThreadEvents) { |
| 1388 tty->print_cr("creating thread %p", this); | |
| 1389 } | |
| 1390 initialize(); | |
| 1391 _is_attaching = false; | |
| 1392 set_entry_point(entry_point); | |
| 1393 // Create the native thread itself. | |
| 1394 // %note runtime_23 | |
| 1395 os::ThreadType thr_type = os::java_thread; | |
| 1396 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1397 os::java_thread; | |
| 1398 os::create_thread(this, thr_type, stack_sz); | |
| 1399 | |
| 1400 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1401 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1402 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1403 // the exception consists of creating the exception object & initializing it, initialization | |
| 1404 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1405 // | |
| 1406 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1407 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1408 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1409 // object must be fully initialized (take a look at JVM_Start) | |
| 1410 } | |
| 1411 | |
| 1412 JavaThread::~JavaThread() { | |
| 1413 if (TraceThreadEvents) { | |
| 1414 tty->print_cr("terminate thread %p", this); | |
| 1415 } | |
| 1416 | |
| 1417 // JSR166 -- return the parker to the free list | |
| 1418 Parker::Release(_parker); | |
| 1419 _parker = NULL ; | |
| 1420 | |
| 1421 // Free any remaining previous UnrollBlock | |
| 1422 vframeArray* old_array = vframe_array_last(); | |
| 1423 | |
| 1424 if (old_array != NULL) { | |
| 1425 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1426 old_array->set_unroll_block(NULL); | |
| 1427 delete old_info; | |
| 1428 delete old_array; | |
| 1429 } | |
| 1430 | |
| 1431 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1432 if (deferred != NULL) { | |
| 1433 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1434 assert(deferred->length() != 0, "empty array!"); | |
| 1435 do { | |
| 1436 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1437 deferred->remove_at(0); | |
| 1438 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1439 delete dlv; | |
| 1440 } while (deferred->length() != 0); | |
| 1441 delete deferred; | |
| 1442 } | |
| 1443 | |
| 1444 // All Java related clean up happens in exit | |
| 1445 ThreadSafepointState::destroy(this); | |
| 1446 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1447 if (_thread_stat != NULL) delete _thread_stat; | |
| 1448 } | |
| 1449 | |
| 1450 | |
| 1451 // The first routine called by a new Java thread | |
| 1452 void JavaThread::run() { | |
| 1453 // initialize thread-local alloc buffer related fields | |
| 1454 this->initialize_tlab(); | |
| 1455 | |
| 1456 // used to test validitity of stack trace backs | |
| 1457 this->record_base_of_stack_pointer(); | |
| 1458 | |
| 1459 // Record real stack base and size. | |
| 1460 this->record_stack_base_and_size(); | |
| 1461 | |
| 1462 // Initialize thread local storage; set before calling MutexLocker | |
| 1463 this->initialize_thread_local_storage(); | |
| 1464 | |
| 1465 this->create_stack_guard_pages(); | |
| 1466 | |
|
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1467 this->cache_global_variables(); |
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1468 |
| 0 | 1469 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1470 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1471 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1472 | |
| 1473 assert(JavaThread::current() == this, "sanity check"); | |
| 1474 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1475 | |
| 1476 DTRACE_THREAD_PROBE(start, this); | |
| 1477 | |
| 1478 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1479 // been completed. | |
| 1480 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1481 | |
| 1482 if (JvmtiExport::should_post_thread_life()) { | |
| 1483 JvmtiExport::post_thread_start(this); | |
| 1484 } | |
| 1485 | |
| 1486 // We call another function to do the rest so we are sure that the stack addresses used | |
| 1487 // from there will be lower than the stack base just computed | |
| 1488 thread_main_inner(); | |
| 1489 | |
| 1490 // Note, thread is no longer valid at this point! | |
| 1491 } | |
| 1492 | |
| 1493 | |
| 1494 void JavaThread::thread_main_inner() { | |
| 1495 assert(JavaThread::current() == this, "sanity check"); | |
| 1496 assert(this->threadObj() != NULL, "just checking"); | |
| 1497 | |
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1498 // Execute thread entry point unless this thread has a pending exception |
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1499 // or has been stopped before starting. |
| 0 | 1500 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1501 if (!this->has_pending_exception() && |
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1502 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 0 | 1503 HandleMark hm(this); |
| 1504 this->entry_point()(this, this); | |
| 1505 } | |
| 1506 | |
| 1507 DTRACE_THREAD_PROBE(stop, this); | |
| 1508 | |
| 1509 this->exit(false); | |
| 1510 delete this; | |
| 1511 } | |
| 1512 | |
| 1513 | |
| 1514 static void ensure_join(JavaThread* thread) { | |
| 1515 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1516 Handle threadObj(thread, thread->threadObj()); | |
| 1517 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1518 ObjectLocker lock(threadObj, thread); | |
| 1519 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1520 thread->clear_pending_exception(); | |
| 1521 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1522 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1523 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1524 // to complete once we've done the notify_all below |
| 0 | 1525 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1526 lock.notify_all(thread); | |
| 1527 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1528 thread->clear_pending_exception(); | |
| 1529 } | |
| 1530 | |
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1531 |
| 0 | 1532 // For any new cleanup additions, please check to see if they need to be applied to |
| 1533 // cleanup_failed_attach_current_thread as well. | |
| 1534 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1535 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1536 if (!InitializeJavaLangSystem) return; | |
| 1537 | |
| 1538 HandleMark hm(this); | |
| 1539 Handle uncaught_exception(this, this->pending_exception()); | |
| 1540 this->clear_pending_exception(); | |
| 1541 Handle threadObj(this, this->threadObj()); | |
| 1542 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1543 | |
| 1544 if (get_thread_profiler() != NULL) { | |
| 1545 get_thread_profiler()->disengage(); | |
| 1546 ResourceMark rm; | |
| 1547 get_thread_profiler()->print(get_thread_name()); | |
| 1548 } | |
| 1549 | |
| 1550 | |
| 1551 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1552 { | |
| 1553 EXCEPTION_MARK; | |
| 1554 | |
| 1555 CLEAR_PENDING_EXCEPTION; | |
| 1556 } | |
| 1557 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1558 // has to be fixed by a runtime query method | |
| 1559 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1560 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1561 // java.lang.Thread.dispatchUncaughtException | |
| 1562 if (uncaught_exception.not_null()) { | |
| 1563 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1564 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
| 1565 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
| 1566 { | |
| 1567 EXCEPTION_MARK; | |
| 1568 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1569 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1570 // so call ThreadGroup.uncaughtException() | |
| 1571 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1572 CallInfo callinfo; | |
| 1142 | 1573 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1574 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1575 vmSymbols::dispatchUncaughtException_name(), |
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1576 vmSymbols::throwable_void_signature(), |
| 0 | 1577 KlassHandle(), false, false, THREAD); |
| 1578 CLEAR_PENDING_EXCEPTION; | |
| 1579 methodHandle method = callinfo.selected_method(); | |
| 1580 if (method.not_null()) { | |
| 1581 JavaValue result(T_VOID); | |
| 1582 JavaCalls::call_virtual(&result, | |
| 1583 threadObj, thread_klass, | |
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1584 vmSymbols::dispatchUncaughtException_name(), |
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1585 vmSymbols::throwable_void_signature(), |
| 0 | 1586 uncaught_exception, |
| 1587 THREAD); | |
| 1588 } else { | |
| 1142 | 1589 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1590 JavaValue result(T_VOID); |
| 1591 JavaCalls::call_virtual(&result, | |
| 1592 group, thread_group, | |
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1593 vmSymbols::uncaughtException_name(), |
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1594 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1595 threadObj, // Arg 1 |
| 1596 uncaught_exception, // Arg 2 | |
| 1597 THREAD); | |
| 1598 } | |
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1599 if (HAS_PENDING_EXCEPTION) { |
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1600 ResourceMark rm(this); |
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1601 jio_fprintf(defaultStream::error_stream(), |
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1602 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1603 " in thread \"%s\"\n", |
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1604 Klass::cast(pending_exception()->klass())->external_name(), |
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1605 get_thread_name()); |
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1606 CLEAR_PENDING_EXCEPTION; |
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1607 } |
| 0 | 1608 } |
| 1609 } | |
| 1610 | |
| 1611 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
| 1612 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1613 // is deprecated anyhow. | |
| 1614 { int count = 3; | |
| 1615 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1616 EXCEPTION_MARK; | |
| 1617 JavaValue result(T_VOID); | |
| 1142 | 1618 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1619 JavaCalls::call_virtual(&result, |
| 1620 threadObj, thread_klass, | |
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1621 vmSymbols::exit_method_name(), |
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1622 vmSymbols::void_method_signature(), |
| 0 | 1623 THREAD); |
| 1624 CLEAR_PENDING_EXCEPTION; | |
| 1625 } | |
| 1626 } | |
| 1627 | |
| 1628 // notify JVMTI | |
| 1629 if (JvmtiExport::should_post_thread_life()) { | |
| 1630 JvmtiExport::post_thread_end(this); | |
| 1631 } | |
| 1632 | |
| 1633 // We have notified the agents that we are exiting, before we go on, | |
| 1634 // we must check for a pending external suspend request and honor it | |
| 1635 // in order to not surprise the thread that made the suspend request. | |
| 1636 while (true) { | |
| 1637 { | |
| 1638 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1639 if (!is_external_suspend()) { | |
| 1640 set_terminated(_thread_exiting); | |
| 1641 ThreadService::current_thread_exiting(this); | |
| 1642 break; | |
| 1643 } | |
| 1644 // Implied else: | |
| 1645 // Things get a little tricky here. We have a pending external | |
| 1646 // suspend request, but we are holding the SR_lock so we | |
| 1647 // can't just self-suspend. So we temporarily drop the lock | |
| 1648 // and then self-suspend. | |
| 1649 } | |
| 1650 | |
| 1651 ThreadBlockInVM tbivm(this); | |
| 1652 java_suspend_self(); | |
| 1653 | |
| 1654 // We're done with this suspend request, but we have to loop around | |
| 1655 // and check again. Eventually we will get SR_lock without a pending | |
| 1656 // external suspend request and will be able to mark ourselves as | |
| 1657 // exiting. | |
| 1658 } | |
| 1659 // no more external suspends are allowed at this point | |
| 1660 } else { | |
| 1661 // before_exit() has already posted JVMTI THREAD_END events | |
| 1662 } | |
| 1663 | |
| 1664 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1665 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1666 // group should have the destroyed bit set before waiters are notified). | |
| 1667 ensure_join(this); | |
| 1668 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1669 | |
| 1670 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1671 // held by this thread must be released. A detach operation must only | |
| 1672 // get here if there are no Java frames on the stack. Therefore, any | |
| 1673 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1674 // pre-inflated and in the monitor cache. | |
| 1675 // | |
| 1676 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1677 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1678 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1679 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1680 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1681 } | |
| 1682 | |
| 1683 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1684 // is in a consistent state, in case GC happens | |
| 1685 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1686 | |
| 1687 if (active_handles() != NULL) { | |
| 1688 JNIHandleBlock* block = active_handles(); | |
| 1689 set_active_handles(NULL); | |
| 1690 JNIHandleBlock::release_block(block); | |
| 1691 } | |
| 1692 | |
| 1693 if (free_handle_block() != NULL) { | |
| 1694 JNIHandleBlock* block = free_handle_block(); | |
| 1695 set_free_handle_block(NULL); | |
| 1696 JNIHandleBlock::release_block(block); | |
| 1697 } | |
| 1698 | |
| 1699 // These have to be removed while this is still a valid thread. | |
| 1700 remove_stack_guard_pages(); | |
| 1701 | |
| 1702 if (UseTLAB) { | |
| 1703 tlab().make_parsable(true); // retire TLAB | |
| 1704 } | |
| 1705 | |
|
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1706 if (JvmtiEnv::environments_might_exist()) { |
|
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1707 JvmtiExport::cleanup_thread(this); |
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1708 } |
|
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1709 |
|
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1710 #ifndef SERIALGC |
|
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1711 // We must flush G1-related buffers before removing a thread from |
|
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1712 // the list of active threads. |
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1713 if (UseG1GC) { |
|
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1714 flush_barrier_queues(); |
|
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1715 } |
|
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1716 #endif |
|
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1717 |
| 0 | 1718 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1719 Threads::remove(this); | |
| 1720 } | |
| 1721 | |
|
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1722 #ifndef SERIALGC |
|
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1723 // Flush G1-related queues. |
|
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1724 void JavaThread::flush_barrier_queues() { |
|
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|
1725 satb_mark_queue().flush(); |
|
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1726 dirty_card_queue().flush(); |
|
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1727 } |
|
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1728 |
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|
1729 void JavaThread::initialize_queues() { |
|
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1730 assert(!SafepointSynchronize::is_at_safepoint(), |
|
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1731 "we should not be at a safepoint"); |
|
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1732 |
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1733 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1734 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1735 // The SATB queue should have been constructed with its active |
|
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1736 // field set to false. |
|
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1737 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
|
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1738 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
|
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1739 // If we are creating the thread during a marking cycle, we should |
|
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1740 // set the active field of the SATB queue to true. |
|
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1741 if (satb_queue_set.is_active()) { |
|
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|
1742 satb_queue.set_active(true); |
|
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1743 } |
|
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1744 |
|
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|
1745 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
|
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1746 // The dirty card queue should have been constructed with its |
|
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1747 // active field set to true. |
|
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|
1748 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
|
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1749 } |
|
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1750 #endif // !SERIALGC |
|
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1751 |
| 0 | 1752 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1753 if (get_thread_profiler() != NULL) { |
|
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|
1754 get_thread_profiler()->disengage(); |
|
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|
1755 ResourceMark rm; |
|
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|
1756 get_thread_profiler()->print(get_thread_name()); |
|
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|
1757 } |
|
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1758 |
|
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1759 if (active_handles() != NULL) { |
|
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1760 JNIHandleBlock* block = active_handles(); |
|
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1761 set_active_handles(NULL); |
|
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1762 JNIHandleBlock::release_block(block); |
|
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|
1763 } |
|
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1764 |
|
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1765 if (free_handle_block() != NULL) { |
|
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1766 JNIHandleBlock* block = free_handle_block(); |
|
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1767 set_free_handle_block(NULL); |
|
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1768 JNIHandleBlock::release_block(block); |
|
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|
1769 } |
|
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1770 |
|
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1771 // These have to be removed while this is still a valid thread. |
|
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1772 remove_stack_guard_pages(); |
|
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1773 |
|
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1774 if (UseTLAB) { |
|
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1775 tlab().make_parsable(true); // retire TLAB, if any |
|
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|
1776 } |
|
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1777 |
|
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|
1778 #ifndef SERIALGC |
|
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1779 if (UseG1GC) { |
|
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|
1780 flush_barrier_queues(); |
|
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|
1781 } |
|
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|
1782 #endif |
|
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1783 |
|
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|
1784 Threads::remove(this); |
|
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|
1785 delete this; |
| 0 | 1786 } |
| 1787 | |
| 1788 | |
|
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1789 |
|
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|
1790 |
| 0 | 1791 JavaThread* JavaThread::active() { |
| 1792 Thread* thread = ThreadLocalStorage::thread(); | |
| 1793 assert(thread != NULL, "just checking"); | |
| 1794 if (thread->is_Java_thread()) { | |
| 1795 return (JavaThread*) thread; | |
| 1796 } else { | |
| 1797 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1798 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1799 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1800 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1801 return ret; | |
| 1802 } | |
| 1803 } | |
| 1804 | |
| 1805 bool JavaThread::is_lock_owned(address adr) const { | |
|
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|
1806 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1807 |
| 1808 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1809 if (chunk->contains(adr)) return true; | |
| 1810 } | |
| 1811 | |
| 1812 return false; | |
| 1813 } | |
| 1814 | |
| 1815 | |
| 1816 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1817 chunk->set_next(monitor_chunks()); | |
| 1818 set_monitor_chunks(chunk); | |
| 1819 } | |
| 1820 | |
| 1821 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1822 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1823 if (monitor_chunks() == chunk) { | |
| 1824 set_monitor_chunks(chunk->next()); | |
| 1825 } else { | |
| 1826 MonitorChunk* prev = monitor_chunks(); | |
| 1827 while (prev->next() != chunk) prev = prev->next(); | |
| 1828 prev->set_next(chunk->next()); | |
| 1829 } | |
| 1830 } | |
| 1831 | |
| 1832 // JVM support. | |
| 1833 | |
| 1834 // Note: this function shouldn't block if it's called in | |
| 1835 // _thread_in_native_trans state (such as from | |
| 1836 // check_special_condition_for_native_trans()). | |
| 1837 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1838 | |
| 1839 if (has_last_Java_frame() && has_async_condition()) { | |
| 1840 // If we are at a polling page safepoint (not a poll return) | |
| 1841 // then we must defer async exception because live registers | |
| 1842 // will be clobbered by the exception path. Poll return is | |
| 1843 // ok because the call we a returning from already collides | |
| 1844 // with exception handling registers and so there is no issue. | |
| 1845 // (The exception handling path kills call result registers but | |
| 1846 // this is ok since the exception kills the result anyway). | |
| 1847 | |
| 1848 if (is_at_poll_safepoint()) { | |
| 1849 // if the code we are returning to has deoptimized we must defer | |
| 1850 // the exception otherwise live registers get clobbered on the | |
| 1851 // exception path before deoptimization is able to retrieve them. | |
| 1852 // | |
| 1853 RegisterMap map(this, false); | |
| 1854 frame caller_fr = last_frame().sender(&map); | |
| 1855 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1856 if (caller_fr.is_deoptimized_frame()) { | |
| 1857 if (TraceExceptions) { | |
| 1858 ResourceMark rm; | |
| 1859 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1860 } | |
| 1861 return; | |
| 1862 } | |
| 1863 } | |
| 1864 } | |
| 1865 | |
| 1866 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1867 if (condition == _no_async_condition) { | |
| 1868 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1869 // was called: | |
| 1870 // - if we were here only because of an external suspend request, | |
| 1871 // then that was taken care of above (or cancelled) so we are done | |
| 1872 // - if we were here because of another async request, then it has | |
| 1873 // been cleared between the has_special_runtime_exit_condition() | |
| 1874 // and now so again we are done | |
| 1875 return; | |
| 1876 } | |
| 1877 | |
| 1878 // Check for pending async. exception | |
| 1879 if (_pending_async_exception != NULL) { | |
| 1880 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 1881 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1882 |
| 1883 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1884 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1885 | |
| 1886 if (TraceExceptions) { | |
| 1887 ResourceMark rm; | |
| 1888 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1889 if (has_last_Java_frame() ) { | |
| 1890 frame f = last_frame(); | |
| 1891 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1892 } | |
| 1893 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1894 } | |
| 1895 _pending_async_exception = NULL; | |
| 1896 clear_has_async_exception(); | |
| 1897 } | |
| 1898 } | |
| 1899 | |
| 1900 if (check_unsafe_error && | |
| 1901 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1902 condition = _no_async_condition; // done | |
| 1903 switch (thread_state()) { | |
| 1904 case _thread_in_vm: | |
| 1905 { | |
| 1906 JavaThread* THREAD = this; | |
| 1907 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1908 } | |
| 1909 case _thread_in_native: | |
| 1910 { | |
| 1911 ThreadInVMfromNative tiv(this); | |
| 1912 JavaThread* THREAD = this; | |
| 1913 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1914 } | |
| 1915 case _thread_in_Java: | |
| 1916 { | |
| 1917 ThreadInVMfromJava tiv(this); | |
| 1918 JavaThread* THREAD = this; | |
| 1919 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1920 } | |
| 1921 default: | |
| 1922 ShouldNotReachHere(); | |
| 1923 } | |
| 1924 } | |
| 1925 | |
| 1926 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1927 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1928 "must have handled the async condition, if no exception"); | |
| 1929 } | |
| 1930 | |
| 1931 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1932 // | |
| 1933 // Check for pending external suspend. Internal suspend requests do | |
| 1934 // not use handle_special_runtime_exit_condition(). | |
| 1935 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1936 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1937 // threads could call into the VM with another thread's JNIEnv so we | |
| 1938 // can be here operating on behalf of a suspended thread (4432884). | |
| 1939 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1940 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1941 // | |
| 1942 // Because thread is external suspended the safepoint code will count | |
| 1943 // thread as at a safepoint. This can be odd because we can be here | |
| 1944 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 1945 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 1946 // before calling java_suspend_self like all other callers of it but | |
| 1947 // we must then observe proper safepoint protocol. (We can't leave | |
| 1948 // _thread_blocked with a safepoint in progress). However we can be | |
| 1949 // here as _thread_in_native_trans so we can't use a normal transition | |
| 1950 // constructor/destructor pair because they assert on that type of | |
| 1951 // transition. We could do something like: | |
| 1952 // | |
| 1953 // JavaThreadState state = thread_state(); | |
| 1954 // set_thread_state(_thread_in_vm); | |
| 1955 // { | |
| 1956 // ThreadBlockInVM tbivm(this); | |
| 1957 // java_suspend_self() | |
| 1958 // } | |
| 1959 // set_thread_state(_thread_in_vm_trans); | |
| 1960 // if (safepoint) block; | |
| 1961 // set_thread_state(state); | |
| 1962 // | |
| 1963 // but that is pretty messy. Instead we just go with the way the | |
| 1964 // code has worked before and note that this is the only path to | |
| 1965 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 1966 // mode. | |
| 1967 | |
| 1968 frame_anchor()->make_walkable(this); | |
| 1969 java_suspend_self(); | |
| 1970 | |
| 1971 // We might be here for reasons in addition to the self-suspend request | |
| 1972 // so check for other async requests. | |
| 1973 } | |
| 1974 | |
| 1975 if (check_asyncs) { | |
| 1976 check_and_handle_async_exceptions(); | |
| 1977 } | |
| 1978 } | |
| 1979 | |
| 1980 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 1981 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 1982 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 1983 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 1984 | |
| 1985 // Do not throw asynchronous exceptions against the compiler thread | |
| 1986 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 1987 if (is_Compiler_thread()) return; | |
| 1988 | |
| 1989 { | |
| 1990 // Actually throw the Throwable against the target Thread - however | |
| 1991 // only if there is no thread death exception installed already. | |
| 1142 | 1992 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1993 // If the topmost frame is a runtime stub, then we are calling into |
| 1994 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 1995 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 1996 // may not be valid | |
| 1997 if (has_last_Java_frame()) { | |
| 1998 frame f = last_frame(); | |
| 1999 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2000 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2001 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2002 frame compiled_frame = f.sender(®_map); | |
| 2003 if (compiled_frame.can_be_deoptimized()) { | |
| 2004 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2005 } | |
| 2006 } | |
| 2007 } | |
| 2008 | |
| 2009 // Set async. pending exception in thread. | |
| 2010 set_pending_async_exception(java_throwable); | |
| 2011 | |
| 2012 if (TraceExceptions) { | |
| 2013 ResourceMark rm; | |
| 2014 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 2015 } | |
| 2016 // for AbortVMOnException flag | |
| 2017 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 2018 } | |
| 2019 } | |
| 2020 | |
| 2021 | |
| 2022 // Interrupt thread so it will wake up from a potential wait() | |
| 2023 Thread::interrupt(this); | |
| 2024 } | |
| 2025 | |
| 2026 // External suspension mechanism. | |
| 2027 // | |
| 2028 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2029 // to any VM_locks and it is at a transition | |
| 2030 // Self-suspension will happen on the transition out of the vm. | |
| 2031 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2032 // | |
| 2033 // Guarantees on return: | |
| 2034 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2035 // force a safepoint) | |
| 2036 // + Target thread will not enter any new monitors | |
| 2037 // | |
| 2038 void JavaThread::java_suspend() { | |
| 2039 { MutexLocker mu(Threads_lock); | |
| 2040 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2041 return; | |
| 2042 } | |
| 2043 } | |
| 2044 | |
| 2045 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2046 if (!is_external_suspend()) { | |
| 2047 // a racing resume has cancelled us; bail out now | |
| 2048 return; | |
| 2049 } | |
| 2050 | |
| 2051 // suspend is done | |
| 2052 uint32_t debug_bits = 0; | |
| 2053 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2054 // SR_lock to allow the thread to reach a stable thread state if | |
| 2055 // it is currently in a transient thread state. | |
| 2056 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2057 SuspendRetryDelay, &debug_bits) ) { | |
| 2058 return; | |
| 2059 } | |
| 2060 } | |
| 2061 | |
| 2062 VM_ForceSafepoint vm_suspend; | |
| 2063 VMThread::execute(&vm_suspend); | |
| 2064 } | |
| 2065 | |
| 2066 // Part II of external suspension. | |
| 2067 // A JavaThread self suspends when it detects a pending external suspend | |
| 2068 // request. This is usually on transitions. It is also done in places | |
| 2069 // where continuing to the next transition would surprise the caller, | |
| 2070 // e.g., monitor entry. | |
| 2071 // | |
| 2072 // Returns the number of times that the thread self-suspended. | |
| 2073 // | |
| 2074 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2075 // thread. java_suspend_self() is the second stage of cooperative | |
| 2076 // suspension for external suspend requests and should only be used | |
| 2077 // to complete an external suspend request. | |
| 2078 // | |
| 2079 int JavaThread::java_suspend_self() { | |
| 2080 int ret = 0; | |
| 2081 | |
| 2082 // we are in the process of exiting so don't suspend | |
| 2083 if (is_exiting()) { | |
| 2084 clear_external_suspend(); | |
| 2085 return ret; | |
| 2086 } | |
| 2087 | |
| 2088 assert(_anchor.walkable() || | |
| 2089 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2090 "must have walkable stack"); | |
| 2091 | |
| 2092 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2093 | |
| 979 | 2094 assert(!this->is_ext_suspended(), |
| 0 | 2095 "a thread trying to self-suspend should not already be suspended"); |
| 2096 | |
| 2097 if (this->is_suspend_equivalent()) { | |
| 2098 // If we are self-suspending as a result of the lifting of a | |
| 2099 // suspend equivalent condition, then the suspend_equivalent | |
| 2100 // flag is not cleared until we set the ext_suspended flag so | |
| 2101 // that wait_for_ext_suspend_completion() returns consistent | |
| 2102 // results. | |
| 2103 this->clear_suspend_equivalent(); | |
| 2104 } | |
| 2105 | |
| 2106 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2107 // above. Or another external suspend request could be waiting for us | |
| 2108 // by the time we return from SR_lock()->wait(). The thread | |
| 2109 // that requested the suspension may already be trying to walk our | |
| 2110 // stack and if we return now, we can change the stack out from under | |
| 2111 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2112 // to crash. We stay self-suspended until there are no more pending | |
| 2113 // external suspend requests. | |
| 2114 while (is_external_suspend()) { | |
| 2115 ret++; | |
| 2116 this->set_ext_suspended(); | |
| 2117 | |
| 2118 // _ext_suspended flag is cleared by java_resume() | |
| 2119 while (is_ext_suspended()) { | |
| 2120 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2121 } | |
| 2122 } | |
| 2123 | |
| 2124 return ret; | |
| 2125 } | |
| 2126 | |
| 2127 #ifdef ASSERT | |
| 2128 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2129 // hence doesn't need protection from concurrent access at this stage | |
| 2130 void JavaThread::verify_not_published() { | |
| 2131 if (!Threads_lock->owned_by_self()) { | |
| 2132 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2133 assert( !Threads::includes(this), | |
| 2134 "java thread shouldn't have been published yet!"); | |
| 2135 } | |
| 2136 else { | |
| 2137 assert( !Threads::includes(this), | |
| 2138 "java thread shouldn't have been published yet!"); | |
| 2139 } | |
| 2140 } | |
| 2141 #endif | |
| 2142 | |
| 2143 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2144 // progress or when _suspend_flags is non-zero. | |
| 2145 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2146 // block if a safepoint is in progress. | |
| 2147 // Async exception ISN'T checked. | |
| 2148 // Note only the ThreadInVMfromNative transition can call this function | |
| 2149 // directly and when thread state is _thread_in_native_trans | |
| 2150 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2151 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2152 | |
| 2153 JavaThread *curJT = JavaThread::current(); | |
| 2154 bool do_self_suspend = thread->is_external_suspend(); | |
| 2155 | |
| 2156 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2157 | |
| 2158 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2159 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2160 // threads could call into the VM with another thread's JNIEnv so we | |
| 2161 // can be here operating on behalf of a suspended thread (4432884). | |
| 2162 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2163 JavaThreadState state = thread->thread_state(); | |
| 2164 | |
| 2165 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2166 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2167 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2168 thread->set_suspend_equivalent(); | |
| 2169 | |
| 2170 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2171 // wait until the thread changes to other thread state. There is no | |
| 2172 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2173 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2174 // too long. Temporarily change the state to _thread_blocked to | |
| 2175 // let the VM thread know that this thread is ready for GC. The problem | |
| 2176 // of changing thread state is that safepoint could happen just after | |
| 2177 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2178 // see the _thread_blocked state. We must check for safepoint | |
| 2179 // after restoring the state and make sure we won't leave while a safepoint | |
| 2180 // is in progress. | |
| 2181 thread->set_thread_state(_thread_blocked); | |
| 2182 thread->java_suspend_self(); | |
| 2183 thread->set_thread_state(state); | |
| 2184 // Make sure new state is seen by VM thread | |
| 2185 if (os::is_MP()) { | |
| 2186 if (UseMembar) { | |
| 2187 // Force a fence between the write above and read below | |
| 2188 OrderAccess::fence(); | |
| 2189 } else { | |
| 2190 // Must use this rather than serialization page in particular on Windows | |
| 2191 InterfaceSupport::serialize_memory(thread); | |
| 2192 } | |
| 2193 } | |
| 2194 } | |
| 2195 | |
| 2196 if (SafepointSynchronize::do_call_back()) { | |
| 2197 // If we are safepointing, then block the caller which may not be | |
| 2198 // the same as the target thread (see above). | |
| 2199 SafepointSynchronize::block(curJT); | |
| 2200 } | |
| 2201 | |
| 2202 if (thread->is_deopt_suspend()) { | |
| 2203 thread->clear_deopt_suspend(); | |
| 2204 RegisterMap map(thread, false); | |
| 2205 frame f = thread->last_frame(); | |
| 2206 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2207 f = f.sender(&map); | |
| 2208 } | |
| 2209 if (f.id() == thread->must_deopt_id()) { | |
| 2210 thread->clear_must_deopt_id(); | |
|
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2211 f.deoptimize(thread); |
| 0 | 2212 } else { |
| 2213 fatal("missed deoptimization!"); | |
| 2214 } | |
| 2215 } | |
| 2216 } | |
| 2217 | |
| 2218 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2219 // progress or when _suspend_flags is non-zero. | |
| 2220 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2221 // block if a safepoint is in progress. | |
| 2222 // Also check for pending async exception (not including unsafe access error). | |
| 2223 // Note only the native==>VM/Java barriers can call this function and when | |
| 2224 // thread state is _thread_in_native_trans. | |
| 2225 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2226 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2227 | |
| 2228 if (thread->has_async_exception()) { | |
| 2229 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2230 // access error since that may block. | |
| 2231 thread->check_and_handle_async_exceptions(false); | |
| 2232 } | |
| 2233 } | |
| 2234 | |
| 2235 // We need to guarantee the Threads_lock here, since resumes are not | |
| 2236 // allowed during safepoint synchronization | |
| 2237 // Can only resume from an external suspension | |
| 2238 void JavaThread::java_resume() { | |
| 2239 assert_locked_or_safepoint(Threads_lock); | |
| 2240 | |
| 2241 // Sanity check: thread is gone, has started exiting or the thread | |
| 2242 // was not externally suspended. | |
| 2243 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2244 return; | |
| 2245 } | |
| 2246 | |
| 2247 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2248 | |
| 2249 clear_external_suspend(); | |
| 2250 | |
| 2251 if (is_ext_suspended()) { | |
| 2252 clear_ext_suspended(); | |
| 2253 SR_lock()->notify_all(); | |
| 2254 } | |
| 2255 } | |
| 2256 | |
| 2257 void JavaThread::create_stack_guard_pages() { | |
| 2258 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2259 address low_addr = stack_base() - stack_size(); | |
| 2260 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2261 | |
| 2262 int allocate = os::allocate_stack_guard_pages(); | |
| 2263 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2264 | |
|
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|
2265 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2266 warning("Attempt to allocate stack guard pages failed."); |
| 2267 return; | |
| 2268 } | |
| 2269 | |
| 2270 if (os::guard_memory((char *) low_addr, len)) { | |
| 2271 _stack_guard_state = stack_guard_enabled; | |
| 2272 } else { | |
| 2273 warning("Attempt to protect stack guard pages failed."); | |
| 2274 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2275 warning("Attempt to deallocate stack guard pages failed."); | |
| 2276 } | |
| 2277 } | |
| 2278 } | |
| 2279 | |
| 2280 void JavaThread::remove_stack_guard_pages() { | |
| 2281 if (_stack_guard_state == stack_guard_unused) return; | |
| 2282 address low_addr = stack_base() - stack_size(); | |
| 2283 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2284 | |
| 2285 if (os::allocate_stack_guard_pages()) { | |
|
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|
2286 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2287 _stack_guard_state = stack_guard_unused; |
| 2288 } else { | |
| 2289 warning("Attempt to deallocate stack guard pages failed."); | |
| 2290 } | |
| 2291 } else { | |
| 2292 if (_stack_guard_state == stack_guard_unused) return; | |
| 2293 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2294 _stack_guard_state = stack_guard_unused; | |
| 2295 } else { | |
| 2296 warning("Attempt to unprotect stack guard pages failed."); | |
| 2297 } | |
| 2298 } | |
| 2299 } | |
| 2300 | |
| 2301 void JavaThread::enable_stack_yellow_zone() { | |
| 2302 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2303 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2304 | |
| 2305 // The base notation is from the stacks point of view, growing downward. | |
| 2306 // We need to adjust it to work correctly with guard_memory() | |
| 2307 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2308 | |
| 2309 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2310 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2311 | |
| 2312 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2313 _stack_guard_state = stack_guard_enabled; | |
| 2314 } else { | |
| 2315 warning("Attempt to guard stack yellow zone failed."); | |
| 2316 } | |
| 2317 enable_register_stack_guard(); | |
| 2318 } | |
| 2319 | |
| 2320 void JavaThread::disable_stack_yellow_zone() { | |
| 2321 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2322 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2323 | |
| 2324 // Simply return if called for a thread that does not use guard pages. | |
| 2325 if (_stack_guard_state == stack_guard_unused) return; | |
| 2326 | |
| 2327 // The base notation is from the stacks point of view, growing downward. | |
| 2328 // We need to adjust it to work correctly with guard_memory() | |
| 2329 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2330 | |
| 2331 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2332 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2333 } else { | |
| 2334 warning("Attempt to unguard stack yellow zone failed."); | |
| 2335 } | |
| 2336 disable_register_stack_guard(); | |
| 2337 } | |
| 2338 | |
| 2339 void JavaThread::enable_stack_red_zone() { | |
| 2340 // The base notation is from the stacks point of view, growing downward. | |
| 2341 // We need to adjust it to work correctly with guard_memory() | |
| 2342 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2343 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2344 | |
| 2345 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2346 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2347 | |
| 2348 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2349 warning("Attempt to guard stack red zone failed."); | |
| 2350 } | |
| 2351 } | |
| 2352 | |
| 2353 void JavaThread::disable_stack_red_zone() { | |
| 2354 // The base notation is from the stacks point of view, growing downward. | |
| 2355 // We need to adjust it to work correctly with guard_memory() | |
| 2356 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2357 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2358 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2359 warning("Attempt to unguard stack red zone failed."); | |
| 2360 } | |
| 2361 } | |
| 2362 | |
| 2363 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2364 // ignore is there is no stack | |
| 2365 if (!has_last_Java_frame()) return; | |
| 2366 // traverse the stack frames. Starts from top frame. | |
| 2367 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2368 frame* fr = fst.current(); | |
| 2369 f(fr, fst.register_map()); | |
| 2370 } | |
| 2371 } | |
| 2372 | |
| 2373 | |
| 2374 #ifndef PRODUCT | |
| 2375 // Deoptimization | |
| 2376 // Function for testing deoptimization | |
| 2377 void JavaThread::deoptimize() { | |
| 2378 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2379 StackFrameStream fst(this, UseBiasedLocking); | |
| 2380 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2381 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2382 // Iterate over all frames in the thread and deoptimize | |
| 2383 for(; !fst.is_done(); fst.next()) { | |
| 2384 if(fst.current()->can_be_deoptimized()) { | |
| 2385 | |
| 2386 if (only_at) { | |
| 2387 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2388 // consists of comma or carriage return separated numbers so | |
| 2389 // search for the current bci in that string. | |
| 2390 address pc = fst.current()->pc(); | |
| 2391 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2392 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2393 char buffer[8]; | |
| 2394 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2395 size_t len = strlen(buffer); | |
| 2396 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2397 while (found != NULL) { | |
| 2398 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2399 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2400 // Check that the bci found is bracketed by terminators. | |
| 2401 break; | |
| 2402 } | |
| 2403 found = strstr(found + 1, buffer); | |
| 2404 } | |
| 2405 if (!found) { | |
| 2406 continue; | |
| 2407 } | |
| 2408 } | |
| 2409 | |
| 2410 if (DebugDeoptimization && !deopt) { | |
| 2411 deopt = true; // One-time only print before deopt | |
| 2412 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2413 trace_frames(); | |
| 2414 trace_stack(); | |
| 2415 } | |
| 2416 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2417 } | |
| 2418 } | |
| 2419 | |
| 2420 if (DebugDeoptimization && deopt) { | |
| 2421 tty->print_cr("[AFTER Deoptimization]"); | |
| 2422 trace_frames(); | |
| 2423 } | |
| 2424 } | |
| 2425 | |
| 2426 | |
| 2427 // Make zombies | |
| 2428 void JavaThread::make_zombies() { | |
| 2429 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2430 if (fst.current()->can_be_deoptimized()) { | |
| 2431 // it is a Java nmethod | |
| 2432 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2433 nm->make_not_entrant(); | |
| 2434 } | |
| 2435 } | |
| 2436 } | |
| 2437 #endif // PRODUCT | |
| 2438 | |
| 2439 | |
| 2440 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2441 if (!has_last_Java_frame()) return; | |
| 2442 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2443 StackFrameStream fst(this, UseBiasedLocking); | |
| 2444 for(; !fst.is_done(); fst.next()) { | |
| 2445 if (fst.current()->should_be_deoptimized()) { | |
| 2446 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2447 } | |
| 2448 } | |
| 2449 } | |
| 2450 | |
| 2451 | |
| 2452 // GC support | |
| 2453 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2454 | |
| 2455 void JavaThread::gc_epilogue() { | |
| 2456 frames_do(frame_gc_epilogue); | |
| 2457 } | |
| 2458 | |
| 2459 | |
| 2460 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2461 | |
| 2462 void JavaThread::gc_prologue() { | |
| 2463 frames_do(frame_gc_prologue); | |
| 2464 } | |
| 2465 | |
|
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2466 // If the caller is a NamedThread, then remember, in the current scope, |
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2467 // the given JavaThread in its _processed_thread field. |
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2468 class RememberProcessedThread: public StackObj { |
|
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2469 NamedThread* _cur_thr; |
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2470 public: |
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2471 RememberProcessedThread(JavaThread* jthr) { |
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2472 Thread* thread = Thread::current(); |
|
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2473 if (thread->is_Named_thread()) { |
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2474 _cur_thr = (NamedThread *)thread; |
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2475 _cur_thr->set_processed_thread(jthr); |
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2476 } else { |
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2477 _cur_thr = NULL; |
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2478 } |
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2479 } |
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2480 |
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2481 ~RememberProcessedThread() { |
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2482 if (_cur_thr) { |
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2483 _cur_thr->set_processed_thread(NULL); |
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2484 } |
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2485 } |
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2486 }; |
| 0 | 2487 |
|
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2488 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2489 // Verify that the deferred card marks have been flushed. |
| 2490 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2491 |
| 0 | 2492 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2493 // since there may be more than one thread using each ThreadProfiler. | |
| 2494 | |
| 2495 // Traverse the GCHandles | |
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2496 Thread::oops_do(f, cf); |
| 0 | 2497 |
| 2498 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2499 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2500 | |
| 2501 if (has_last_Java_frame()) { | |
|
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2502 // Record JavaThread to GC thread |
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2503 RememberProcessedThread rpt(this); |
| 0 | 2504 |
| 2505 // Traverse the privileged stack | |
| 2506 if (_privileged_stack_top != NULL) { | |
| 2507 _privileged_stack_top->oops_do(f); | |
| 2508 } | |
| 2509 | |
| 2510 // traverse the registered growable array | |
| 2511 if (_array_for_gc != NULL) { | |
| 2512 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2513 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2514 } | |
| 2515 } | |
| 2516 | |
| 2517 // Traverse the monitor chunks | |
| 2518 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2519 chunk->oops_do(f); | |
| 2520 } | |
| 2521 | |
| 2522 // Traverse the execution stack | |
| 2523 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2524 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2525 } |
| 2526 } | |
| 2527 | |
| 2528 // callee_target is never live across a gc point so NULL it here should | |
| 2529 // it still contain a methdOop. | |
| 2530 | |
| 2531 set_callee_target(NULL); | |
| 2532 | |
| 2533 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2534 // If we have deferred set_locals there might be oops waiting to be | |
| 2535 // written | |
| 2536 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2537 if (list != NULL) { | |
| 2538 for (int i = 0; i < list->length(); i++) { | |
| 2539 list->at(i)->oops_do(f); | |
| 2540 } | |
| 2541 } | |
| 2542 | |
| 2543 // Traverse instance variables at the end since the GC may be moving things | |
| 2544 // around using this function | |
| 2545 f->do_oop((oop*) &_threadObj); | |
| 2546 f->do_oop((oop*) &_vm_result); | |
| 2547 f->do_oop((oop*) &_vm_result_2); | |
| 2548 f->do_oop((oop*) &_exception_oop); | |
| 2549 f->do_oop((oop*) &_pending_async_exception); | |
| 2550 | |
| 2551 if (jvmti_thread_state() != NULL) { | |
| 2552 jvmti_thread_state()->oops_do(f); | |
| 2553 } | |
| 2554 } | |
| 2555 | |
|
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2556 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2557 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2558 |
| 2559 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2560 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2561 | |
| 2562 if (has_last_Java_frame()) { | |
| 2563 // Traverse the execution stack | |
| 2564 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2565 fst.current()->nmethods_do(cf); |
| 0 | 2566 } |
| 2567 } | |
| 2568 } | |
| 2569 | |
| 2570 // Printing | |
| 2571 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2572 switch (_thread_state) { | |
| 2573 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2574 case _thread_new: return "_thread_new"; | |
| 2575 case _thread_new_trans: return "_thread_new_trans"; | |
| 2576 case _thread_in_native: return "_thread_in_native"; | |
| 2577 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2578 case _thread_in_vm: return "_thread_in_vm"; | |
| 2579 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2580 case _thread_in_Java: return "_thread_in_Java"; | |
| 2581 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2582 case _thread_blocked: return "_thread_blocked"; | |
| 2583 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2584 default: return "unknown thread state"; | |
| 2585 } | |
| 2586 } | |
| 2587 | |
| 2588 #ifndef PRODUCT | |
| 2589 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2590 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2591 }; | |
| 2592 void JavaThread::print_thread_state() const { | |
| 2593 print_thread_state_on(tty); | |
| 2594 }; | |
| 2595 #endif // PRODUCT | |
| 2596 | |
| 2597 // Called by Threads::print() for VM_PrintThreads operation | |
| 2598 void JavaThread::print_on(outputStream *st) const { | |
| 2599 st->print("\"%s\" ", get_thread_name()); | |
| 2600 oop thread_oop = threadObj(); | |
| 2601 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2602 Thread::print_on(st); | |
| 2603 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2604 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2605 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2606 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2607 } | |
| 2608 #ifndef PRODUCT | |
| 2609 print_thread_state_on(st); | |
| 2610 _safepoint_state->print_on(st); | |
| 2611 #endif // PRODUCT | |
| 2612 } | |
| 2613 | |
| 2614 // Called by fatal error handler. The difference between this and | |
| 2615 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2616 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2617 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2618 oop thread_obj = threadObj(); | |
| 2619 if (thread_obj != NULL) { | |
| 2620 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2621 } | |
| 2622 st->print(" ["); | |
| 2623 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2624 if (osthread()) { | |
| 2625 st->print(", id=%d", osthread()->thread_id()); | |
| 2626 } | |
| 2627 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2628 _stack_base - _stack_size, _stack_base); | |
| 2629 st->print("]"); | |
| 2630 return; | |
| 2631 } | |
| 2632 | |
| 2633 // Verification | |
| 2634 | |
| 2635 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2636 | |
| 2637 void JavaThread::verify() { | |
| 2638 // Verify oops in the thread. | |
|
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2639 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2640 |
| 2641 // Verify the stack frames. | |
| 2642 frames_do(frame_verify); | |
| 2643 } | |
| 2644 | |
| 2645 // CR 6300358 (sub-CR 2137150) | |
| 2646 // Most callers of this method assume that it can't return NULL but a | |
| 2647 // thread may not have a name whilst it is in the process of attaching to | |
| 2648 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2649 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2650 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2651 // for such that this method never returns NULL. | |
| 2652 const char* JavaThread::get_thread_name() const { | |
| 2653 #ifdef ASSERT | |
| 2654 // early safepoints can hit while current thread does not yet have TLS | |
| 2655 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2656 Thread *cur = Thread::current(); | |
| 2657 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2658 // Current JavaThreads are allowed to get their own name without | |
| 2659 // the Threads_lock. | |
| 2660 assert_locked_or_safepoint(Threads_lock); | |
| 2661 } | |
| 2662 } | |
| 2663 #endif // ASSERT | |
| 2664 return get_thread_name_string(); | |
| 2665 } | |
| 2666 | |
| 2667 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2668 // descriptive string if there is no set name | |
| 2669 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2670 const char* name_str; | |
| 2671 oop thread_obj = threadObj(); | |
| 2672 if (thread_obj != NULL) { | |
| 2673 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2674 if (name != NULL) { | |
| 2675 if (buf == NULL) { | |
| 2676 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2677 } | |
| 2678 else { | |
| 2679 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2680 } | |
| 2681 } | |
| 2682 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
| 2683 name_str = "<no-name - thread is attaching>"; | |
| 2684 } | |
| 2685 else { | |
| 2686 name_str = Thread::name(); | |
| 2687 } | |
| 2688 } | |
| 2689 else { | |
| 2690 name_str = Thread::name(); | |
| 2691 } | |
| 2692 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2693 return name_str; | |
| 2694 } | |
| 2695 | |
| 2696 | |
| 2697 const char* JavaThread::get_threadgroup_name() const { | |
| 2698 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2699 oop thread_obj = threadObj(); | |
| 2700 if (thread_obj != NULL) { | |
| 2701 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2702 if (thread_group != NULL) { | |
| 2703 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2704 // ThreadGroup.name can be null | |
| 2705 if (name != NULL) { | |
| 2706 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2707 return str; | |
| 2708 } | |
| 2709 } | |
| 2710 } | |
| 2711 return NULL; | |
| 2712 } | |
| 2713 | |
| 2714 const char* JavaThread::get_parent_name() const { | |
| 2715 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2716 oop thread_obj = threadObj(); | |
| 2717 if (thread_obj != NULL) { | |
| 2718 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2719 if (thread_group != NULL) { | |
| 2720 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2721 if (parent != NULL) { | |
| 2722 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2723 // ThreadGroup.name can be null | |
| 2724 if (name != NULL) { | |
| 2725 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2726 return str; | |
| 2727 } | |
| 2728 } | |
| 2729 } | |
| 2730 } | |
| 2731 return NULL; | |
| 2732 } | |
| 2733 | |
| 2734 ThreadPriority JavaThread::java_priority() const { | |
| 2735 oop thr_oop = threadObj(); | |
| 2736 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2737 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2738 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2739 return priority; | |
| 2740 } | |
| 2741 | |
| 2742 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2743 | |
| 2744 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2745 // Link Java Thread object <-> C++ Thread | |
| 2746 | |
| 2747 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2748 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2749 // be used to pass the C++ thread object to other methods. | |
| 2750 | |
| 2751 // Set the Java level thread object (jthread) field of the | |
| 2752 // new thread (a JavaThread *) to C++ thread object using the | |
| 2753 // "thread_oop" handle. | |
| 2754 | |
| 2755 // Set the thread field (a JavaThread *) of the | |
| 2756 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2757 | |
| 2758 Handle thread_oop(Thread::current(), | |
| 2759 JNIHandles::resolve_non_null(jni_thread)); | |
| 2760 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2761 "must be initialized"); | |
| 2762 set_threadObj(thread_oop()); | |
| 2763 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2764 | |
| 2765 if (prio == NoPriority) { | |
| 2766 prio = java_lang_Thread::priority(thread_oop()); | |
| 2767 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2768 } | |
| 2769 | |
| 2770 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2771 Thread::set_priority(this, prio); | |
| 2772 | |
| 2773 // Add the new thread to the Threads list and set it in motion. | |
| 2774 // We must have threads lock in order to call Threads::add. | |
| 2775 // It is crucial that we do not block before the thread is | |
| 2776 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2777 // will not be visited by GC. | |
| 2778 Threads::add(this); | |
| 2779 } | |
| 2780 | |
| 2781 oop JavaThread::current_park_blocker() { | |
| 2782 // Support for JSR-166 locks | |
| 2783 oop thread_oop = threadObj(); | |
| 242 | 2784 if (thread_oop != NULL && |
| 2785 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2786 return java_lang_Thread::park_blocker(thread_oop); |
| 2787 } | |
| 2788 return NULL; | |
| 2789 } | |
| 2790 | |
| 2791 | |
| 2792 void JavaThread::print_stack_on(outputStream* st) { | |
| 2793 if (!has_last_Java_frame()) return; | |
| 2794 ResourceMark rm; | |
| 2795 HandleMark hm; | |
| 2796 | |
| 2797 RegisterMap reg_map(this); | |
| 2798 vframe* start_vf = last_java_vframe(®_map); | |
| 2799 int count = 0; | |
| 2800 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2801 if (f->is_java_frame()) { | |
| 2802 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2803 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2804 | |
| 2805 // Print out lock information | |
| 2806 if (JavaMonitorsInStackTrace) { | |
| 2807 jvf->print_lock_info_on(st, count); | |
| 2808 } | |
| 2809 } else { | |
| 2810 // Ignore non-Java frames | |
| 2811 } | |
| 2812 | |
| 2813 // Bail-out case for too deep stacks | |
| 2814 count++; | |
| 2815 if (MaxJavaStackTraceDepth == count) return; | |
| 2816 } | |
| 2817 } | |
| 2818 | |
| 2819 | |
| 2820 // JVMTI PopFrame support | |
| 2821 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2822 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2823 if (in_bytes(size_in_bytes) != 0) { | |
| 2824 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2825 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
|
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|
2826 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2827 } |
| 2828 } | |
| 2829 | |
| 2830 void* JavaThread::popframe_preserved_args() { | |
| 2831 return _popframe_preserved_args; | |
| 2832 } | |
| 2833 | |
| 2834 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2835 return in_ByteSize(_popframe_preserved_args_size); | |
| 2836 } | |
| 2837 | |
| 2838 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2839 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2840 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2841 return in_WordSize(sz / wordSize); | |
| 2842 } | |
| 2843 | |
| 2844 void JavaThread::popframe_free_preserved_args() { | |
| 2845 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2846 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2847 _popframe_preserved_args = NULL; | |
| 2848 _popframe_preserved_args_size = 0; | |
| 2849 } | |
| 2850 | |
| 2851 #ifndef PRODUCT | |
| 2852 | |
| 2853 void JavaThread::trace_frames() { | |
| 2854 tty->print_cr("[Describe stack]"); | |
| 2855 int frame_no = 1; | |
| 2856 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2857 tty->print(" %d. ", frame_no++); | |
| 2858 fst.current()->print_value_on(tty,this); | |
| 2859 tty->cr(); | |
| 2860 } | |
| 2861 } | |
| 2862 | |
| 2863 | |
|
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2864 #ifdef ASSERT |
|
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2865 // Print or validate the layout of stack frames |
|
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2866 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
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2867 ResourceMark rm; |
|
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|
2868 PRESERVE_EXCEPTION_MARK; |
|
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|
2869 FrameValues values; |
|
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|
2870 int frame_no = 0; |
|
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2871 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
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|
2872 fst.current()->describe(values, ++frame_no); |
|
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2873 if (depth == frame_no) break; |
|
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|
2874 } |
|
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|
2875 if (validate_only) { |
|
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|
2876 values.validate(); |
|
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|
2877 } else { |
|
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2878 tty->print_cr("[Describe stack layout]"); |
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2879 values.print(); |
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|
2880 } |
|
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|
2881 } |
|
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2882 #endif |
|
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|
2883 |
| 0 | 2884 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 2885 ResourceMark rm; | |
| 2886 int vframe_no = 1; | |
| 2887 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2888 if (f->is_java_frame()) { | |
| 2889 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 2890 } else { | |
| 2891 f->print(); | |
| 2892 } | |
| 2893 if (vframe_no > StackPrintLimit) { | |
| 2894 tty->print_cr("...<more frames>..."); | |
| 2895 return; | |
| 2896 } | |
| 2897 } | |
| 2898 } | |
| 2899 | |
| 2900 | |
| 2901 void JavaThread::trace_stack() { | |
| 2902 if (!has_last_Java_frame()) return; | |
| 2903 ResourceMark rm; | |
| 2904 HandleMark hm; | |
| 2905 RegisterMap reg_map(this); | |
| 2906 trace_stack_from(last_java_vframe(®_map)); | |
| 2907 } | |
| 2908 | |
| 2909 | |
| 2910 #endif // PRODUCT | |
| 2911 | |
| 2912 | |
| 2913 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 2914 assert(reg_map != NULL, "a map must be given"); | |
| 2915 frame f = last_frame(); | |
| 2916 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 2917 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 2918 } | |
| 2919 return NULL; | |
| 2920 } | |
| 2921 | |
| 2922 | |
| 2923 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 2924 vframeStream vfst(this); | |
| 2925 vfst.security_get_caller_frame(depth); | |
| 2926 if (!vfst.at_end()) { | |
| 2927 return vfst.method()->method_holder(); | |
| 2928 } | |
| 2929 return NULL; | |
| 2930 } | |
| 2931 | |
| 2932 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 2933 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 2934 CompileBroker::compiler_thread_loop(); | |
| 2935 } | |
| 2936 | |
| 2937 // Create a CompilerThread | |
| 2938 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 2939 : JavaThread(&compiler_thread_entry) { | |
| 2940 _env = NULL; | |
| 2941 _log = NULL; | |
| 2942 _task = NULL; | |
| 2943 _queue = queue; | |
| 2944 _counters = counters; | |
| 1584 | 2945 _buffer_blob = NULL; |
|
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|
2946 _scanned_nmethod = NULL; |
| 0 | 2947 |
| 2948 #ifndef PRODUCT | |
| 2949 _ideal_graph_printer = NULL; | |
| 2950 #endif | |
| 2951 } | |
| 2952 | |
|
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2953 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
|
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2954 JavaThread::oops_do(f, cf); |
|
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2955 if (_scanned_nmethod != NULL && cf != NULL) { |
|
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|
2956 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
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|
2957 // process it here to make sure it isn't unloaded in the middle of |
|
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|
2958 // a scan. |
|
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|
2959 cf->do_code_blob(_scanned_nmethod); |
|
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|
2960 } |
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|
2961 } |
| 0 | 2962 |
| 2963 // ======= Threads ======== | |
| 2964 | |
| 2965 // The Threads class links together all active threads, and provides | |
| 2966 // operations over all threads. It is protected by its own Mutex | |
| 2967 // lock, which is also used in other contexts to protect thread | |
| 2968 // operations from having the thread being operated on from exiting | |
| 2969 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 2970 | |
| 2971 JavaThread* Threads::_thread_list = NULL; | |
| 2972 int Threads::_number_of_threads = 0; | |
| 2973 int Threads::_number_of_non_daemon_threads = 0; | |
| 2974 int Threads::_return_code = 0; | |
| 2975 size_t JavaThread::_stack_size_at_create = 0; | |
| 2976 | |
| 2977 // All JavaThreads | |
| 2978 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 2979 | |
| 2980 void os_stream(); | |
| 2981 | |
| 2982 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 2983 void Threads::threads_do(ThreadClosure* tc) { | |
| 2984 assert_locked_or_safepoint(Threads_lock); | |
| 2985 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 2986 ALL_JAVA_THREADS(p) { | |
| 2987 tc->do_thread(p); | |
| 2988 } | |
| 2989 // Someday we could have a table or list of all non-JavaThreads. | |
| 2990 // For now, just manually iterate through them. | |
| 2991 tc->do_thread(VMThread::vm_thread()); | |
| 2992 Universe::heap()->gc_threads_do(tc); | |
|
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2993 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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2994 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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2995 // the data for WatcherThread is still valid upon being examined. However, |
|
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2996 // considering that WatchThread terminates when the VM is on the way to |
|
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2997 // exit at safepoint, the chance of the above is extremely small. The right |
|
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2998 // way to prevent termination of WatcherThread would be to acquire |
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2999 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3000 // checking in some cases. |
|
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|
3001 if (wt != NULL) |
|
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3002 tc->do_thread(wt); |
|
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|
3003 |
| 0 | 3004 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3005 } | |
| 3006 | |
| 3007 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3008 | |
| 242 | 3009 extern void JDK_Version_init(); |
| 3010 | |
| 0 | 3011 // Check version |
| 3012 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3013 | |
| 3014 // Initialize the output stream module | |
| 3015 ostream_init(); | |
| 3016 | |
| 3017 // Process java launcher properties. | |
| 3018 Arguments::process_sun_java_launcher_properties(args); | |
| 3019 | |
| 3020 // Initialize the os module before using TLS | |
| 3021 os::init(); | |
| 3022 | |
| 3023 // Initialize system properties. | |
| 3024 Arguments::init_system_properties(); | |
| 3025 | |
| 242 | 3026 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3027 JDK_Version_init(); | |
| 3028 | |
|
1864
dfb38ea7da17
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|
3029 // Update/Initialize System properties after JDK version number is known |
|
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|
3030 Arguments::init_version_specific_system_properties(); |
|
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|
3031 |
| 0 | 3032 // Parse arguments |
| 3033 jint parse_result = Arguments::parse(args); | |
| 3034 if (parse_result != JNI_OK) return parse_result; | |
| 3035 | |
| 3036 if (PauseAtStartup) { | |
| 3037 os::pause(); | |
| 3038 } | |
| 3039 | |
| 3040 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
| 3041 | |
| 3042 // Record VM creation timing statistics | |
| 3043 TraceVmCreationTime create_vm_timer; | |
| 3044 create_vm_timer.start(); | |
| 3045 | |
| 3046 // Timing (must come after argument parsing) | |
| 3047 TraceTime timer("Create VM", TraceStartupTime); | |
| 3048 | |
| 3049 // Initialize the os module after parsing the args | |
| 3050 jint os_init_2_result = os::init_2(); | |
| 3051 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3052 | |
| 3053 // Initialize output stream logging | |
| 3054 ostream_init_log(); | |
| 3055 | |
| 3056 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3057 // Must be before create_vm_init_agents() | |
| 3058 if (Arguments::init_libraries_at_startup()) { | |
| 3059 convert_vm_init_libraries_to_agents(); | |
| 3060 } | |
| 3061 | |
| 3062 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3063 if (Arguments::init_agents_at_startup()) { | |
| 3064 create_vm_init_agents(); | |
| 3065 } | |
| 3066 | |
| 3067 // Initialize Threads state | |
| 3068 _thread_list = NULL; | |
| 3069 _number_of_threads = 0; | |
| 3070 _number_of_non_daemon_threads = 0; | |
| 3071 | |
| 3072 // Initialize TLS | |
| 3073 ThreadLocalStorage::init(); | |
| 3074 | |
| 3075 // Initialize global data structures and create system classes in heap | |
| 3076 vm_init_globals(); | |
| 3077 | |
| 3078 // Attach the main thread to this os thread | |
| 3079 JavaThread* main_thread = new JavaThread(); | |
| 3080 main_thread->set_thread_state(_thread_in_vm); | |
| 3081 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3082 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3083 // change the stack size recorded here to one based on the java thread | |
| 3084 // stacksize. This adjusted size is what is used to figure the placement | |
| 3085 // of the guard pages. | |
| 3086 main_thread->record_stack_base_and_size(); | |
| 3087 main_thread->initialize_thread_local_storage(); | |
| 3088 | |
| 3089 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3090 | |
| 3091 if (!main_thread->set_as_starting_thread()) { | |
| 3092 vm_shutdown_during_initialization( | |
| 3093 "Failed necessary internal allocation. Out of swap space"); | |
| 3094 delete main_thread; | |
| 3095 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3096 return JNI_ENOMEM; | |
| 3097 } | |
| 3098 | |
| 3099 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3100 // crash Linux VM, see notes in os_linux.cpp. | |
| 3101 main_thread->create_stack_guard_pages(); | |
| 3102 | |
| 1878 | 3103 // Initialize Java-Level synchronization subsystem |
| 3104 ObjectMonitor::Initialize() ; | |
| 0 | 3105 |
| 3106 // Initialize global modules | |
| 3107 jint status = init_globals(); | |
| 3108 if (status != JNI_OK) { | |
| 3109 delete main_thread; | |
| 3110 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3111 return status; | |
| 3112 } | |
| 3113 | |
|
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|
3114 // Should be done after the heap is fully created |
|
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|
3115 main_thread->cache_global_variables(); |
|
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|
3116 |
| 0 | 3117 HandleMark hm; |
| 3118 | |
| 3119 { MutexLocker mu(Threads_lock); | |
| 3120 Threads::add(main_thread); | |
| 3121 } | |
| 3122 | |
| 3123 // Any JVMTI raw monitors entered in onload will transition into | |
| 3124 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3125 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3126 | |
| 3127 if (VerifyBeforeGC && | |
| 3128 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3129 Universe::heap()->prepare_for_verify(); | |
| 3130 Universe::verify(); // make sure we're starting with a clean slate | |
| 3131 } | |
| 3132 | |
| 3133 // Create the VMThread | |
| 3134 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3135 VMThread::create(); | |
| 3136 Thread* vmthread = VMThread::vm_thread(); | |
| 3137 | |
| 3138 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3139 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3140 | |
| 3141 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3142 // Monitors can have spurious returns, must always check another state flag | |
| 3143 { | |
| 3144 MutexLocker ml(Notify_lock); | |
| 3145 os::start_thread(vmthread); | |
| 3146 while (vmthread->active_handles() == NULL) { | |
| 3147 Notify_lock->wait(); | |
| 3148 } | |
| 3149 } | |
| 3150 } | |
| 3151 | |
| 3152 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3153 EXCEPTION_MARK; | |
| 3154 | |
| 3155 // At this point, the Universe is initialized, but we have not executed | |
| 3156 // any byte code. Now is a good time (the only time) to dump out the | |
| 3157 // internal state of the JVM for sharing. | |
| 3158 | |
| 3159 if (DumpSharedSpaces) { | |
| 3160 Universe::heap()->preload_and_dump(CHECK_0); | |
| 3161 ShouldNotReachHere(); | |
| 3162 } | |
| 3163 | |
| 3164 // Always call even when there are not JVMTI environments yet, since environments | |
| 3165 // may be attached late and JVMTI must track phases of VM execution | |
| 3166 JvmtiExport::enter_start_phase(); | |
| 3167 | |
| 3168 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3169 JvmtiExport::post_vm_start(); | |
| 3170 | |
| 3171 { | |
| 3172 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3173 | |
| 3174 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3175 create_vm_init_libraries(); | |
| 3176 } | |
| 3177 | |
| 3178 if (InitializeJavaLangString) { | |
|
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|
3179 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3180 } else { |
| 3181 warning("java.lang.String not initialized"); | |
| 3182 } | |
| 3183 | |
|
18
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|
3184 if (AggressiveOpts) { |
|
192
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|
3185 { |
|
6d13fcb3663f
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|
3186 // Forcibly initialize java/util/HashMap and mutate the private |
|
6d13fcb3663f
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|
3187 // static final "frontCacheEnabled" field before we start creating instances |
|
18
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|
3188 #ifdef ASSERT |
|
2177
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|
3189 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3190 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
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|
3191 #endif |
|
2177
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|
3192 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3193 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3194 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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|
3195 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3196 ik->initialize(CHECK_0); |
|
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|
3197 fieldDescriptor fd; |
|
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|
3198 // Possible we might not find this field; if so, don't break |
|
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|
3199 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
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|
3200 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
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|
3201 } |
|
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|
3202 } |
|
6d13fcb3663f
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diff
changeset
|
3203 |
|
6d13fcb3663f
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diff
changeset
|
3204 if (UseStringCache) { |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3205 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
6d13fcb3663f
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|
3206 // static final "stringCacheEnabled" field before we start creating instances |
|
2177
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diff
changeset
|
3207 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
eca19a8425b5
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changeset
|
3208 // Possible that StringValue isn't present: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3209 if (k_o != NULL) { |
|
eca19a8425b5
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diff
changeset
|
3210 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
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diff
changeset
|
3211 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3212 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3213 fieldDescriptor fd; |
|
eca19a8425b5
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441
diff
changeset
|
3214 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3215 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
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diff
changeset
|
3216 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
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|
3217 } |
|
192
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|
3218 } |
|
18
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diff
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|
3219 } |
|
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|
3220 } |
|
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|
3221 |
| 0 | 3222 // Initialize java_lang.System (needed before creating the thread) |
| 3223 if (InitializeJavaLangSystem) { | |
|
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|
3224 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
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|
3225 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3226 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3227 Universe::set_main_thread_group(thread_group()); | |
|
2177
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|
3228 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3229 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3230 main_thread->set_threadObj(thread_object); | |
| 3231 // Set thread status to running since main thread has | |
| 3232 // been started and running. | |
| 3233 java_lang_Thread::set_thread_status(thread_object, | |
| 3234 java_lang_Thread::RUNNABLE); | |
| 3235 | |
| 3236 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
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|
3237 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3238 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3239 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
3582bf76420e
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diff
changeset
|
3240 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3241 call_initializeSystemClass(CHECK_0); |
| 3242 } else { | |
| 3243 warning("java.lang.System not initialized"); | |
| 3244 } | |
| 3245 | |
| 3246 // an instance of OutOfMemory exception has been allocated earlier | |
| 3247 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
changeset
|
3248 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3249 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3250 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3251 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3252 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
3253 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3254 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
| 0 | 3255 } else { |
| 3256 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3257 warning("java.lang.NullPointerException has not been initialized"); | |
| 3258 warning("java.lang.ClassCastException has not been initialized"); | |
| 3259 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3260 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3261 warning("java.lang.StackOverflowError has not been initialized"); | |
| 3262 } | |
|
2416
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6817525: turn on method handle functionality by default for JSR 292
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2376
diff
changeset
|
3263 } |
| 0 | 3264 |
| 3265 // See : bugid 4211085. | |
| 3266 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3267 // property"java.compiler" and read & write property "java.vm.info". | |
| 3268 // When a security manager is installed through the command line | |
| 3269 // option "-Djava.security.manager", the above properties are not | |
| 3270 // readable and the static initializer for java.lang.Compiler fails | |
| 3271 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3272 // user code which calls methods in java.lang.Compiler. | |
| 3273 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3274 // system domains are on the stack when the properties are read. | |
| 3275 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3276 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3277 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3278 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3279 // Once that is done, we should remove this hack. | |
|
2177
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2162
diff
changeset
|
3280 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3281 |
| 3282 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3283 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3284 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3285 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3286 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3287 reset_vm_info_property(CHECK_0); | |
| 3288 | |
| 3289 quicken_jni_functions(); | |
| 3290 | |
| 3291 // Set flag that basic initialization has completed. Used by exceptions and various | |
| 3292 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3293 set_init_completed(); | |
| 3294 | |
| 3295 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
| 3296 | |
| 3297 // record VM initialization completion time | |
| 3298 Management::record_vm_init_completed(); | |
| 3299 | |
| 3300 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3301 // valid exceptions may be thrown in the process. | |
| 3302 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3303 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3304 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3305 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3306 if (HAS_PENDING_EXCEPTION) { | |
| 3307 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3308 } | |
| 3309 | |
| 3310 #ifndef SERIALGC | |
| 3311 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3312 // and better encapsulated. The ugly nested if test would go away |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
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|
3313 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
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changeset
|
3314 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3315 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
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changeset
|
3316 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
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diff
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|
3317 } else { |
|
37f87013dfd8
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diff
changeset
|
3318 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
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|
3319 } |
| 0 | 3320 if (HAS_PENDING_EXCEPTION) { |
| 3321 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3322 } | |
| 3323 } | |
| 3324 #endif // SERIALGC | |
| 3325 | |
| 3326 // Always call even when there are not JVMTI environments yet, since environments | |
| 3327 // may be attached late and JVMTI must track phases of VM execution | |
| 3328 JvmtiExport::enter_live_phase(); | |
| 3329 | |
| 3330 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3331 os::signal_init(); | |
| 3332 | |
| 3333 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3334 if (!DisableAttachMechanism) { | |
| 3335 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3336 AttachListener::init(); | |
| 3337 } | |
| 3338 } | |
| 3339 | |
| 3340 // Launch -Xrun agents | |
| 3341 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3342 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3343 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3344 create_vm_init_libraries(); | |
| 3345 } | |
| 3346 | |
| 3347 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
| 3348 JvmtiExport::post_vm_initialized(); | |
| 3349 | |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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3769
diff
changeset
|
3350 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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3769
diff
changeset
|
3351 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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diff
changeset
|
3352 } |
| 0 | 3353 |
| 3354 // initialize compiler(s) | |
| 3355 CompileBroker::compilation_init(); | |
| 3356 | |
| 3357 Management::initialize(THREAD); | |
| 3358 if (HAS_PENDING_EXCEPTION) { | |
| 3359 // management agent fails to start possibly due to | |
| 3360 // configuration problem and is responsible for printing | |
| 3361 // stack trace if appropriate. Simply exit VM. | |
| 3362 vm_exit(1); | |
| 3363 } | |
| 3364 | |
| 3365 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3366 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3367 if (MemProfiling) MemProfiler::engage(); | |
| 3368 StatSampler::engage(); | |
| 3369 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3370 | |
| 3371 BiasedLocking::init(); | |
| 3372 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3373 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3374 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3375 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3376 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3377 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3378 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3379 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3380 } |
| 0 | 3381 |
| 3382 // Start up the WatcherThread if there are any periodic tasks | |
| 3383 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3384 // aren't, late joiners might appear to start slowly (we might | |
| 3385 // take a while to process their first tick). | |
| 3386 if (PeriodicTask::num_tasks() > 0) { | |
| 3387 WatcherThread::start(); | |
| 3388 } | |
| 3389 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3390 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3391 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3392 |
| 0 | 3393 create_vm_timer.end(); |
| 3394 return JNI_OK; | |
| 3395 } | |
| 3396 | |
| 3397 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3398 extern "C" { | |
| 3399 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3400 } | |
| 3401 // Find a command line agent library and return its entry point for | |
| 3402 // -agentlib: -agentpath: -Xrun | |
| 3403 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3404 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3405 OnLoadEntry_t on_load_entry = NULL; | |
| 3406 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3407 | |
| 3408 if (library == NULL) { | |
| 3409 char buffer[JVM_MAXPATHLEN]; | |
| 3410 char ebuf[1024]; | |
| 3411 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
|
3412 const char *msg = "Could not find agent library "; |
| 0 | 3413 |
| 3414 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3415 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3416 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3417 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
|
3418 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3419 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3420 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3421 // 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
|
3422 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3423 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3424 } |
| 3425 } else { | |
| 3426 // Try to load the agent from the standard dll directory | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3427 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3428 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3429 #ifdef KERNEL |
| 3430 // Download instrument dll | |
| 3431 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3432 char *props = Arguments::get_kernel_properties(); | |
| 3433 char *home = Arguments::get_java_home(); | |
| 3434 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3435 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3436 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3437 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
| 0 | 3438 jio_snprintf(cmd, length, fmt, home, props); |
| 3439 int status = os::fork_and_exec(cmd); | |
| 3440 FreeHeap(props); | |
| 3441 if (status == -1) { | |
| 3442 warning(cmd); | |
| 3443 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3444 strerror(errno)); | |
| 3445 } | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3446 FREE_C_HEAP_ARRAY(char, cmd); |
| 0 | 3447 // when this comes back the instrument.dll should be where it belongs. |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3448 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3449 } |
| 3450 #endif // KERNEL | |
| 3451 if (library == NULL) { // Try the local directory | |
| 3452 char ns[1] = {0}; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3453 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3454 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3455 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3456 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
|
3457 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3458 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3459 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3460 // 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
|
3461 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3462 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3463 } |
| 3464 } | |
| 3465 } | |
| 3466 agent->set_os_lib(library); | |
| 3467 } | |
| 3468 | |
| 3469 // Find the OnLoad function. | |
| 3470 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3471 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3472 if (on_load_entry != NULL) break; |
| 3473 } | |
| 3474 return on_load_entry; | |
| 3475 } | |
| 3476 | |
| 3477 // Find the JVM_OnLoad entry point | |
| 3478 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3479 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3480 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3481 } | |
| 3482 | |
| 3483 // Find the Agent_OnLoad entry point | |
| 3484 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3485 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3486 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3487 } | |
| 3488 | |
| 3489 // For backwards compatibility with -Xrun | |
| 3490 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3491 // treated like -agentpath: | |
| 3492 // Must be called before agent libraries are created | |
| 3493 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3494 AgentLibrary* agent; | |
| 3495 AgentLibrary* next; | |
| 3496 | |
| 3497 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3498 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3499 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3500 | |
| 3501 // If there is an JVM_OnLoad function it will get called later, | |
| 3502 // otherwise see if there is an Agent_OnLoad | |
| 3503 if (on_load_entry == NULL) { | |
| 3504 on_load_entry = lookup_agent_on_load(agent); | |
| 3505 if (on_load_entry != NULL) { | |
| 3506 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3507 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3508 Arguments::convert_library_to_agent(agent); | |
| 3509 } else { | |
| 3510 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3511 } | |
| 3512 } | |
| 3513 } | |
| 3514 } | |
| 3515 | |
| 3516 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3517 // Invokes Agent_OnLoad | |
| 3518 // Called very early -- before JavaThreads exist | |
| 3519 void Threads::create_vm_init_agents() { | |
| 3520 extern struct JavaVM_ main_vm; | |
| 3521 AgentLibrary* agent; | |
| 3522 | |
| 3523 JvmtiExport::enter_onload_phase(); | |
| 3524 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3525 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3526 | |
| 3527 if (on_load_entry != NULL) { | |
| 3528 // Invoke the Agent_OnLoad function | |
| 3529 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3530 if (err != JNI_OK) { | |
| 3531 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3532 } | |
| 3533 } else { | |
| 3534 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3535 } | |
| 3536 } | |
| 3537 JvmtiExport::enter_primordial_phase(); | |
| 3538 } | |
| 3539 | |
| 3540 extern "C" { | |
| 3541 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3542 } | |
| 3543 | |
| 3544 void Threads::shutdown_vm_agents() { | |
| 3545 // Send any Agent_OnUnload notifications | |
| 3546 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3547 extern struct JavaVM_ main_vm; | |
| 3548 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3549 | |
| 3550 // Find the Agent_OnUnload function. | |
| 3551 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3552 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3553 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3554 |
| 3555 // Invoke the Agent_OnUnload function | |
| 3556 if (unload_entry != NULL) { | |
| 3557 JavaThread* thread = JavaThread::current(); | |
| 3558 ThreadToNativeFromVM ttn(thread); | |
| 3559 HandleMark hm(thread); | |
| 3560 (*unload_entry)(&main_vm); | |
| 3561 break; | |
| 3562 } | |
| 3563 } | |
| 3564 } | |
| 3565 } | |
| 3566 | |
| 3567 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3568 // Invokes JVM_OnLoad | |
| 3569 void Threads::create_vm_init_libraries() { | |
| 3570 extern struct JavaVM_ main_vm; | |
| 3571 AgentLibrary* agent; | |
| 3572 | |
| 3573 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3574 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3575 | |
| 3576 if (on_load_entry != NULL) { | |
| 3577 // Invoke the JVM_OnLoad function | |
| 3578 JavaThread* thread = JavaThread::current(); | |
| 3579 ThreadToNativeFromVM ttn(thread); | |
| 3580 HandleMark hm(thread); | |
| 3581 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3582 if (err != JNI_OK) { | |
| 3583 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3584 } | |
| 3585 } else { | |
| 3586 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3587 } | |
| 3588 } | |
| 3589 } | |
| 3590 | |
| 3591 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3592 void JavaThread::invoke_shutdown_hooks() { | |
| 3593 HandleMark hm(this); | |
| 3594 | |
| 3595 // We could get here with a pending exception, if so clear it now. | |
| 3596 if (this->has_pending_exception()) { | |
| 3597 this->clear_pending_exception(); | |
| 3598 } | |
| 3599 | |
| 3600 EXCEPTION_MARK; | |
| 3601 klassOop k = | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3602 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3603 THREAD); |
| 3604 if (k != NULL) { | |
| 3605 // SystemDictionary::resolve_or_null will return null if there was | |
| 3606 // an exception. If we cannot load the Shutdown class, just don't | |
| 3607 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3608 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3609 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3610 // was called, the Shutdown class would have already been loaded | |
| 3611 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3612 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3613 JavaValue result(T_VOID); | |
| 3614 JavaCalls::call_static(&result, | |
| 3615 shutdown_klass, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3616 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3617 vmSymbols::void_method_signature(), |
| 0 | 3618 THREAD); |
| 3619 } | |
| 3620 CLEAR_PENDING_EXCEPTION; | |
| 3621 } | |
| 3622 | |
| 3623 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3624 // the program falls off the end of main(). Another VM exit path is through | |
| 3625 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3626 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3627 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3628 // and VM_Exit op at VM level. | |
| 3629 // | |
| 3630 // Shutdown sequence: | |
| 3631 // + Wait until we are the last non-daemon thread to execute | |
| 3632 // <-- every thing is still working at this moment --> | |
| 3633 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3634 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3635 // + Call before_exit(), prepare for VM exit | |
| 3636 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3637 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3638 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3639 // post thread end and vm death events to JVMTI, | |
| 3640 // stop signal thread | |
| 3641 // + Call JavaThread::exit(), it will: | |
| 3642 // > release JNI handle blocks, remove stack guard pages | |
| 3643 // > remove this thread from Threads list | |
| 3644 // <-- no more Java code from this thread after this point --> | |
| 3645 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3646 // the compiler threads at safepoint | |
| 3647 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3648 // + Disable tracing at JNI/JVM barriers | |
| 3649 // + Set _vm_exited flag for threads that are still running native code | |
| 3650 // + Delete this thread | |
| 3651 // + Call exit_globals() | |
| 3652 // > deletes tty | |
| 3653 // > deletes PerfMemory resources | |
| 3654 // + Return to caller | |
| 3655 | |
| 3656 bool Threads::destroy_vm() { | |
| 3657 JavaThread* thread = JavaThread::current(); | |
| 3658 | |
| 3659 // Wait until we are the last non-daemon thread to execute | |
| 3660 { MutexLocker nu(Threads_lock); | |
| 3661 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3662 // This wait should make safepoint checks, wait without a timeout, | |
| 3663 // and wait as a suspend-equivalent condition. | |
| 3664 // | |
| 3665 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3666 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3667 // is waiting for the external suspend request on this thread to | |
| 3668 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3669 // timeout, but that takes time. Making this wait a suspend- | |
| 3670 // equivalent condition solves that timeout problem. | |
| 3671 // | |
| 3672 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3673 Mutex::_as_suspend_equivalent_flag); | |
| 3674 } | |
| 3675 | |
| 3676 // Hang forever on exit if we are reporting an error. | |
| 3677 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3678 os::infinite_sleep(); | |
| 3679 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2203
diff
changeset
|
3680 os::wait_for_keypress_at_exit(); |
| 0 | 3681 |
| 3682 if (JDK_Version::is_jdk12x_version()) { | |
| 3683 // We are the last thread running, so check if finalizers should be run. | |
| 3684 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3685 HandleMark rm(thread); | |
| 3686 Universe::run_finalizers_on_exit(); | |
| 3687 } else { | |
| 3688 // run Java level shutdown hooks | |
| 3689 thread->invoke_shutdown_hooks(); | |
| 3690 } | |
| 3691 | |
| 3692 before_exit(thread); | |
| 3693 | |
| 3694 thread->exit(true); | |
| 3695 | |
| 3696 // Stop VM thread. | |
| 3697 { | |
| 3698 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3699 // GC vm_operations can get caught at the safepoint, and the | |
| 3700 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3701 // to prevent this. The GC vm_operations will not be able to | |
| 3702 // queue until after the vm thread is dead. | |
|
3769
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3703 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3704 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3705 // stopped; they remain inactive until the process exits. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3706 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3707 // but these will not be accessing the heap, just some G1-specific side |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3708 // data structures that are not accessed by any other threads but them |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3709 // after this point in a terminal safepoint. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3710 |
| 0 | 3711 MutexLocker ml(Heap_lock); |
| 3712 | |
| 3713 VMThread::wait_for_vm_thread_exit(); | |
| 3714 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3715 VMThread::destroy(); | |
| 3716 } | |
| 3717 | |
| 3718 // clean up ideal graph printers | |
| 3719 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3720 IdealGraphPrinter::clean_up(); | |
| 3721 #endif | |
| 3722 | |
| 3723 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3724 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3725 // daemon threads executing native code are still running. But they | |
| 3726 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3727 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3728 | |
| 3729 #ifndef PRODUCT | |
| 3730 // disable function tracing at JNI/JVM barriers | |
| 3731 TraceJNICalls = false; | |
| 3732 TraceJVMCalls = false; | |
| 3733 TraceRuntimeCalls = false; | |
| 3734 #endif | |
| 3735 | |
| 3736 VM_Exit::set_vm_exited(); | |
| 3737 | |
| 3738 notify_vm_shutdown(); | |
| 3739 | |
| 3740 delete thread; | |
| 3741 | |
| 3742 // exit_globals() will delete tty | |
| 3743 exit_globals(); | |
| 3744 | |
| 3745 return true; | |
| 3746 } | |
| 3747 | |
| 3748 | |
| 3749 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3750 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3751 return is_supported_jni_version(version); | |
| 3752 } | |
| 3753 | |
| 3754 | |
| 3755 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3756 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3757 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3758 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3759 return JNI_FALSE; | |
| 3760 } | |
| 3761 | |
| 3762 | |
| 3763 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3764 // The threads lock must be owned at this point | |
| 3765 assert_locked_or_safepoint(Threads_lock); | |
|
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|
3766 |
|
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|
3767 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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|
3768 // why it is called here. |
|
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|
3769 p->initialize_queues(); |
| 0 | 3770 p->set_next(_thread_list); |
| 3771 _thread_list = p; | |
| 3772 _number_of_threads++; | |
| 3773 oop threadObj = p->threadObj(); | |
| 3774 bool daemon = true; | |
| 3775 // Bootstrapping problem: threadObj can be null for initial | |
| 3776 // JavaThread (or for threads attached via JNI) | |
| 3777 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3778 _number_of_non_daemon_threads++; | |
| 3779 daemon = false; | |
| 3780 } | |
| 3781 | |
| 3782 ThreadService::add_thread(p, daemon); | |
| 3783 | |
| 3784 // Possible GC point. | |
| 3785 Events::log("Thread added: " INTPTR_FORMAT, p); | |
| 3786 } | |
| 3787 | |
| 3788 void Threads::remove(JavaThread* p) { | |
| 3789 // Extra scope needed for Thread_lock, so we can check | |
| 3790 // that we do not remove thread without safepoint code notice | |
| 3791 { MutexLocker ml(Threads_lock); | |
| 3792 | |
| 3793 assert(includes(p), "p must be present"); | |
| 3794 | |
| 3795 JavaThread* current = _thread_list; | |
| 3796 JavaThread* prev = NULL; | |
| 3797 | |
| 3798 while (current != p) { | |
| 3799 prev = current; | |
| 3800 current = current->next(); | |
| 3801 } | |
| 3802 | |
| 3803 if (prev) { | |
| 3804 prev->set_next(current->next()); | |
| 3805 } else { | |
| 3806 _thread_list = p->next(); | |
| 3807 } | |
| 3808 _number_of_threads--; | |
| 3809 oop threadObj = p->threadObj(); | |
| 3810 bool daemon = true; | |
| 3811 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3812 _number_of_non_daemon_threads--; | |
| 3813 daemon = false; | |
| 3814 | |
| 3815 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3816 // on destroy_vm will wake up. | |
| 3817 if (number_of_non_daemon_threads() == 1) | |
| 3818 Threads_lock->notify_all(); | |
| 3819 } | |
| 3820 ThreadService::remove_thread(p, daemon); | |
| 3821 | |
| 3822 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3823 // the thread might mess around with locks after this point. This can cause it | |
| 3824 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3825 // of this thread since it is removed from the queue. | |
| 3826 p->set_terminated_value(); | |
| 3827 } // unlock Threads_lock | |
| 3828 | |
| 3829 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
| 3830 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
| 3831 } | |
| 3832 | |
| 3833 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3834 bool Threads::includes(JavaThread* p) { | |
| 3835 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3836 ALL_JAVA_THREADS(q) { | |
| 3837 if (q == p ) { | |
| 3838 return true; | |
| 3839 } | |
| 3840 } | |
| 3841 return false; | |
| 3842 } | |
| 3843 | |
| 3844 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3845 // but the garbage collector must provide a safe context for them to run. | |
| 3846 // In particular, these things should never be called when the Threads_lock | |
| 3847 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3848 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3849 // all threads gets blocked when exiting or starting). | |
| 3850 | |
|
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diff
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|
3851 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3852 ALL_JAVA_THREADS(p) { |
|
989
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844
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changeset
|
3853 p->oops_do(f, cf); |
| 0 | 3854 } |
|
989
148e5441d916
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|
3855 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3856 } |
| 3857 | |
|
989
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diff
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|
3858 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3859 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3860 // root groups. Overhead should be small enough to use all the time, | |
| 3861 // even in sequential code. | |
| 3862 SharedHeap* sh = SharedHeap::heap(); | |
| 3863 bool is_par = (sh->n_par_threads() > 0); | |
| 3864 int cp = SharedHeap::heap()->strong_roots_parity(); | |
| 3865 ALL_JAVA_THREADS(p) { | |
| 3866 if (p->claim_oops_do(is_par, cp)) { | |
|
989
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diff
changeset
|
3867 p->oops_do(f, cf); |
| 0 | 3868 } |
| 3869 } | |
| 3870 VMThread* vmt = VMThread::vm_thread(); | |
| 3871 if (vmt->claim_oops_do(is_par, cp)) | |
|
989
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changeset
|
3872 vmt->oops_do(f, cf); |
| 0 | 3873 } |
| 3874 | |
| 3875 #ifndef SERIALGC | |
| 3876 // Used by ParallelScavenge | |
| 3877 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 3878 ALL_JAVA_THREADS(p) { | |
| 3879 q->enqueue(new ThreadRootsTask(p)); | |
| 3880 } | |
| 3881 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 3882 } | |
| 3883 | |
| 3884 // Used by Parallel Old | |
| 3885 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 3886 ALL_JAVA_THREADS(p) { | |
| 3887 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 3888 } | |
| 3889 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 3890 } | |
| 3891 #endif // SERIALGC | |
| 3892 | |
|
989
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diff
changeset
|
3893 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 3894 ALL_JAVA_THREADS(p) { |
|
989
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diff
changeset
|
3895 p->nmethods_do(cf); |
| 0 | 3896 } |
|
989
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diff
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|
3897 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 3898 } |
| 3899 | |
| 3900 void Threads::gc_epilogue() { | |
| 3901 ALL_JAVA_THREADS(p) { | |
| 3902 p->gc_epilogue(); | |
| 3903 } | |
| 3904 } | |
| 3905 | |
| 3906 void Threads::gc_prologue() { | |
| 3907 ALL_JAVA_THREADS(p) { | |
| 3908 p->gc_prologue(); | |
| 3909 } | |
| 3910 } | |
| 3911 | |
| 3912 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 3913 ALL_JAVA_THREADS(p) { | |
| 3914 p->deoptimized_wrt_marked_nmethods(); | |
| 3915 } | |
| 3916 } | |
| 3917 | |
| 3918 | |
| 3919 // Get count Java threads that are waiting to enter the specified monitor. | |
| 3920 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 3921 address monitor, bool doLock) { | |
| 3922 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 3923 "must grab Threads_lock or be at safepoint"); | |
| 3924 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 3925 | |
| 3926 int i = 0; | |
| 3927 { | |
| 3928 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3929 ALL_JAVA_THREADS(p) { | |
| 3930 if (p->is_Compiler_thread()) continue; | |
| 3931 | |
| 3932 address pending = (address)p->current_pending_monitor(); | |
| 3933 if (pending == monitor) { // found a match | |
| 3934 if (i < count) result->append(p); // save the first count matches | |
| 3935 i++; | |
| 3936 } | |
| 3937 } | |
| 3938 } | |
| 3939 return result; | |
| 3940 } | |
| 3941 | |
| 3942 | |
| 3943 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 3944 assert(doLock || | |
| 3945 Threads_lock->owned_by_self() || | |
| 3946 SafepointSynchronize::is_at_safepoint(), | |
| 3947 "must grab Threads_lock or be at safepoint"); | |
| 3948 | |
| 3949 // NULL owner means not locked so we can skip the search | |
| 3950 if (owner == NULL) return NULL; | |
| 3951 | |
| 3952 { | |
| 3953 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3954 ALL_JAVA_THREADS(p) { | |
| 3955 // first, see if owner is the address of a Java thread | |
| 3956 if (owner == (address)p) return p; | |
| 3957 } | |
| 3958 } | |
| 3959 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 3960 if (UseHeavyMonitors) return NULL; | |
| 3961 | |
| 3962 // | |
| 3963 // If we didn't find a matching Java thread and we didn't force use of | |
| 3964 // heavyweight monitors, then the owner is the stack address of the | |
| 3965 // Lock Word in the owning Java thread's stack. | |
| 3966 // | |
| 3967 JavaThread* the_owner = NULL; | |
| 3968 { | |
| 3969 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3970 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
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669
diff
changeset
|
3971 if (q->is_lock_owned(owner)) { |
| 0 | 3972 the_owner = q; |
|
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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diff
changeset
|
3973 break; |
| 0 | 3974 } |
| 3975 } | |
| 3976 } | |
| 3977 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 3978 return the_owner; | |
| 3979 } | |
| 3980 | |
| 3981 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 3982 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 3983 char buf[32]; | |
| 3984 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 3985 | |
| 3986 st->print_cr("Full thread dump %s (%s %s):", | |
| 3987 Abstract_VM_Version::vm_name(), | |
| 3988 Abstract_VM_Version::vm_release(), | |
| 3989 Abstract_VM_Version::vm_info_string() | |
| 3990 ); | |
| 3991 st->cr(); | |
| 3992 | |
| 3993 #ifndef SERIALGC | |
| 3994 // Dump concurrent locks | |
| 3995 ConcurrentLocksDump concurrent_locks; | |
| 3996 if (print_concurrent_locks) { | |
| 3997 concurrent_locks.dump_at_safepoint(); | |
| 3998 } | |
| 3999 #endif // SERIALGC | |
| 4000 | |
| 4001 ALL_JAVA_THREADS(p) { | |
| 4002 ResourceMark rm; | |
| 4003 p->print_on(st); | |
| 4004 if (print_stacks) { | |
| 4005 if (internal_format) { | |
| 4006 p->trace_stack(); | |
| 4007 } else { | |
| 4008 p->print_stack_on(st); | |
| 4009 } | |
| 4010 } | |
| 4011 st->cr(); | |
| 4012 #ifndef SERIALGC | |
| 4013 if (print_concurrent_locks) { | |
| 4014 concurrent_locks.print_locks_on(p, st); | |
| 4015 } | |
| 4016 #endif // SERIALGC | |
| 4017 } | |
| 4018 | |
| 4019 VMThread::vm_thread()->print_on(st); | |
| 4020 st->cr(); | |
| 4021 Universe::heap()->print_gc_threads_on(st); | |
| 4022 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4023 if (wt != NULL) wt->print_on(st); | |
| 4024 st->cr(); | |
| 4025 CompileBroker::print_compiler_threads_on(st); | |
| 4026 st->flush(); | |
| 4027 } | |
| 4028 | |
| 4029 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4030 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4031 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4032 // memory (even in resource area), it might deadlock the error handler. | |
| 4033 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4034 bool found_current = false; | |
| 4035 st->print_cr("Java Threads: ( => current thread )"); | |
| 4036 ALL_JAVA_THREADS(thread) { | |
| 4037 bool is_current = (current == thread); | |
| 4038 found_current = found_current || is_current; | |
| 4039 | |
| 4040 st->print("%s", is_current ? "=>" : " "); | |
| 4041 | |
| 4042 st->print(PTR_FORMAT, thread); | |
| 4043 st->print(" "); | |
| 4044 thread->print_on_error(st, buf, buflen); | |
| 4045 st->cr(); | |
| 4046 } | |
| 4047 st->cr(); | |
| 4048 | |
| 4049 st->print_cr("Other Threads:"); | |
| 4050 if (VMThread::vm_thread()) { | |
| 4051 bool is_current = (current == VMThread::vm_thread()); | |
| 4052 found_current = found_current || is_current; | |
| 4053 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4054 | |
| 4055 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4056 st->print(" "); | |
| 4057 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4058 st->cr(); | |
| 4059 } | |
| 4060 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4061 if (wt != NULL) { | |
| 4062 bool is_current = (current == wt); | |
| 4063 found_current = found_current || is_current; | |
| 4064 st->print("%s", is_current ? "=>" : " "); | |
| 4065 | |
| 4066 st->print(PTR_FORMAT, wt); | |
| 4067 st->print(" "); | |
| 4068 wt->print_on_error(st, buf, buflen); | |
| 4069 st->cr(); | |
| 4070 } | |
| 4071 if (!found_current) { | |
| 4072 st->cr(); | |
| 4073 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4074 current->print_on_error(st, buf, buflen); | |
| 4075 st->cr(); | |
| 4076 } | |
| 4077 } | |
| 4078 | |
| 1878 | 4079 // Internal SpinLock and Mutex |
| 4080 // Based on ParkEvent | |
| 4081 | |
| 4082 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4083 // |
| 1878 | 4084 // We employ SpinLocks _only for low-contention, fixed-length |
| 4085 // short-duration critical sections where we're concerned | |
| 4086 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4087 // The mux construct provides a spin-then-block mutual exclusion | |
| 4088 // mechanism. | |
| 4089 // | |
| 4090 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4091 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4092 // for the JVM to devolve to yielding with little progress. This is true | |
| 4093 // despite the fact that the critical sections protected by ListLock are | |
| 4094 // extremely short. | |
| 0 | 4095 // |
| 1878 | 4096 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4097 // We should make this a 1st-class type, integrated into the lock | |
| 4098 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4099 // should have sufficient padding to avoid false-sharing and excessive | |
| 4100 // cache-coherency traffic. | |
| 4101 | |
| 4102 | |
| 4103 typedef volatile int SpinLockT ; | |
| 4104 | |
| 4105 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4106 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4107 return ; // normal fast-path return | |
| 4108 } | |
| 4109 | |
| 4110 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4111 TEVENT (SpinAcquire - ctx) ; | |
| 4112 int ctr = 0 ; | |
| 4113 int Yields = 0 ; | |
| 0 | 4114 for (;;) { |
| 1878 | 4115 while (*adr != 0) { |
| 4116 ++ctr ; | |
| 4117 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4118 if (Yields > 5) { | |
| 4119 // Consider using a simple NakedSleep() instead. | |
| 4120 // Then SpinAcquire could be called by non-JVM threads | |
| 4121 Thread::current()->_ParkEvent->park(1) ; | |
| 4122 } else { | |
| 4123 os::NakedYield() ; | |
| 4124 ++Yields ; | |
| 4125 } | |
| 4126 } else { | |
| 4127 SpinPause() ; | |
| 0 | 4128 } |
| 1878 | 4129 } |
| 4130 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4131 } |
| 4132 } | |
| 4133 | |
| 1878 | 4134 void Thread::SpinRelease (volatile int * adr) { |
| 4135 assert (*adr != 0, "invariant") ; | |
| 4136 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4137 // Roach-motel semantics. | |
| 4138 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4139 // but prior LDs and STs within the critical section can't be allowed | |
| 4140 // to reorder or float past the ST that releases the lock. | |
| 4141 *adr = 0 ; | |
| 0 | 4142 } |
| 4143 | |
| 1878 | 4144 // muxAcquire and muxRelease: |
| 4145 // | |
| 4146 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4147 // The LSB of the word is set IFF the lock is held. | |
| 4148 // The remainder of the word points to the head of a singly-linked list | |
| 4149 // of threads blocked on the lock. | |
| 4150 // | |
| 4151 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4152 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4153 // minimizing the peak number of extant ParkEvent instances then | |
| 4154 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4155 // as certain invariants were satisfied. Specifically, care would need | |
| 4156 // to be taken with regards to consuming unpark() "permits". | |
| 4157 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4158 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4159 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4160 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4161 // One way around this would be to widen the restricted-range semaphore | |
| 4162 // implemented in park(). Another alternative would be to provide | |
| 4163 // multiple instances of the PlatformEvent() for each thread. One | |
| 4164 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4165 // | |
| 4166 // * Usage: | |
| 4167 // -- Only as leaf locks | |
| 4168 // -- for short-term locking only as muxAcquire does not perform | |
| 4169 // thread state transitions. | |
| 4170 // | |
| 4171 // Alternatives: | |
| 4172 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4173 // but with parking or spin-then-park instead of pure spinning. | |
| 4174 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4175 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4176 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4177 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4178 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4179 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4180 // boundaries by using placement-new. | |
| 4181 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4182 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4183 // The validity of the backlinks must be ratified before we trust the value. | |
| 4184 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4185 // the forward links, which are always trustworthy. | |
| 4186 // * Add a successor indication. The LockWord is currently encoded as | |
| 4187 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4188 // to provide the usual futile-wakeup optimization. | |
| 4189 // See RTStt for details. | |
| 4190 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4191 // | |
| 4192 | |
| 4193 | |
| 4194 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4195 enum MuxBits { LOCKBIT = 1 } ; | |
| 4196 | |
| 4197 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4198 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4199 if (w == 0) return ; | |
| 4200 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4201 return ; | |
| 4202 } | |
| 4203 | |
| 4204 TEVENT (muxAcquire - Contention) ; | |
| 4205 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4206 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4207 for (;;) { |
| 1878 | 4208 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4209 | |
| 4210 // Optional spin phase: spin-then-park strategy | |
| 4211 while (--its >= 0) { | |
| 4212 w = *Lock ; | |
| 4213 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4214 return ; | |
| 4215 } | |
| 4216 } | |
| 4217 | |
| 4218 Self->reset() ; | |
| 4219 Self->OnList = intptr_t(Lock) ; | |
| 4220 // The following fence() isn't _strictly necessary as the subsequent | |
| 4221 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4222 OrderAccess::fence(); | |
| 4223 for (;;) { | |
| 4224 w = *Lock ; | |
| 4225 if ((w & LOCKBIT) == 0) { | |
| 4226 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4227 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4228 return ; | |
| 4229 } | |
| 4230 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4231 } |
| 1878 | 4232 assert (w & LOCKBIT, "invariant") ; |
| 4233 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4234 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4235 } | |
| 4236 | |
| 4237 while (Self->OnList != 0) { | |
| 4238 Self->park() ; | |
| 4239 } | |
| 0 | 4240 } |
| 4241 } | |
| 4242 | |
| 1878 | 4243 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4244 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4245 if (w == 0) return ; | |
| 4246 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4247 return ; | |
| 4248 } | |
| 4249 | |
| 4250 TEVENT (muxAcquire - Contention) ; | |
| 4251 ParkEvent * ReleaseAfter = NULL ; | |
| 4252 if (ev == NULL) { | |
| 4253 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4254 } | |
| 4255 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4256 for (;;) { | |
| 4257 guarantee (ev->OnList == 0, "invariant") ; | |
| 4258 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4259 | |
| 4260 // Optional spin phase: spin-then-park strategy | |
| 4261 while (--its >= 0) { | |
| 4262 w = *Lock ; | |
| 4263 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4264 if (ReleaseAfter != NULL) { | |
| 4265 ParkEvent::Release (ReleaseAfter) ; | |
| 4266 } | |
| 4267 return ; | |
| 4268 } | |
| 4269 } | |
| 4270 | |
| 4271 ev->reset() ; | |
| 4272 ev->OnList = intptr_t(Lock) ; | |
| 4273 // The following fence() isn't _strictly necessary as the subsequent | |
| 4274 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4275 OrderAccess::fence(); | |
| 4276 for (;;) { | |
| 4277 w = *Lock ; | |
| 4278 if ((w & LOCKBIT) == 0) { | |
| 4279 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4280 ev->OnList = 0 ; | |
| 4281 // We call ::Release while holding the outer lock, thus | |
| 4282 // artificially lengthening the critical section. | |
| 4283 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4284 // after we've dropped the outer lock. | |
| 4285 if (ReleaseAfter != NULL) { | |
| 4286 ParkEvent::Release (ReleaseAfter) ; | |
| 4287 } | |
| 4288 return ; | |
| 4289 } | |
| 4290 continue ; // Interference -- *Lock changed -- Just retry | |
| 4291 } | |
| 4292 assert (w & LOCKBIT, "invariant") ; | |
| 4293 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4294 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4295 } | |
| 4296 | |
| 4297 while (ev->OnList != 0) { | |
| 4298 ev->park() ; | |
| 4299 } | |
| 4300 } | |
| 4301 } | |
| 4302 | |
| 4303 // Release() must extract a successor from the list and then wake that thread. | |
| 4304 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4305 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4306 // Release() would : | |
| 4307 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4308 // (B) Extract a successor from the private list "in-hand" | |
| 4309 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4310 // If there were any newly arrived threads and the CAS() would fail. | |
| 4311 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4312 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4313 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4314 // The wakee would be responsible for reattaching and remerging before it | |
| 4315 // competed for the lock. | |
| 4316 // | |
| 4317 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4318 // multiple concurrent pushers, but only one popper or detacher. | |
| 4319 // This implementation pops from the head of the list. This is unfair, | |
| 4320 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4321 // (We wake recently run threads first). | |
| 4322 | |
| 4323 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4324 for (;;) { | |
| 4325 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4326 assert (w & LOCKBIT, "invariant") ; | |
| 4327 if (w == LOCKBIT) return ; | |
| 4328 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4329 assert (List != NULL, "invariant") ; | |
| 4330 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4331 ParkEvent * nxt = List->ListNext ; | |
| 4332 | |
| 4333 // The following CAS() releases the lock and pops the head element. | |
| 4334 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4335 continue ; | |
| 4336 } | |
| 4337 List->OnList = 0 ; | |
| 4338 OrderAccess::fence() ; | |
| 4339 List->unpark () ; | |
| 4340 return ; | |
| 4341 } | |
| 4342 } | |
| 4343 | |
| 4344 | |
| 0 | 4345 void Threads::verify() { |
| 4346 ALL_JAVA_THREADS(p) { | |
| 4347 p->verify(); | |
| 4348 } | |
| 4349 VMThread* thread = VMThread::vm_thread(); | |
| 4350 if (thread != NULL) thread->verify(); | |
| 4351 } |