Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 3650:0e8a2a629afb
Pass-by compilation broker.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Wed, 16 Nov 2011 21:27:28 +0100 |
| parents | bc95d122df79 |
| children | dc7902820c9b |
| 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" | |
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32 #include "graal/graalCompiler.hpp" |
| 1972 | 33 #include "interpreter/interpreter.hpp" |
| 34 #include "interpreter/linkResolver.hpp" | |
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35 #include "interpreter/oopMapCache.hpp" |
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36 #include "jvmtifiles/jvmtiEnv.hpp" |
| 1972 | 37 #include "memory/oopFactory.hpp" |
| 38 #include "memory/universe.inline.hpp" | |
| 39 #include "oops/instanceKlass.hpp" | |
| 40 #include "oops/objArrayOop.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
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42 #include "oops/symbol.hpp" |
| 1972 | 43 #include "prims/jvm_misc.hpp" |
| 44 #include "prims/jvmtiExport.hpp" | |
| 45 #include "prims/jvmtiThreadState.hpp" | |
| 46 #include "prims/privilegedStack.hpp" | |
| 47 #include "runtime/aprofiler.hpp" | |
| 48 #include "runtime/arguments.hpp" | |
| 49 #include "runtime/biasedLocking.hpp" | |
| 50 #include "runtime/deoptimization.hpp" | |
| 51 #include "runtime/fprofiler.hpp" | |
| 52 #include "runtime/frame.inline.hpp" | |
| 53 #include "runtime/init.hpp" | |
| 54 #include "runtime/interfaceSupport.hpp" | |
| 55 #include "runtime/java.hpp" | |
| 56 #include "runtime/javaCalls.hpp" | |
| 57 #include "runtime/jniPeriodicChecker.hpp" | |
| 58 #include "runtime/memprofiler.hpp" | |
| 59 #include "runtime/mutexLocker.hpp" | |
| 60 #include "runtime/objectMonitor.hpp" | |
| 61 #include "runtime/osThread.hpp" | |
| 62 #include "runtime/safepoint.hpp" | |
| 63 #include "runtime/sharedRuntime.hpp" | |
| 64 #include "runtime/statSampler.hpp" | |
| 65 #include "runtime/stubRoutines.hpp" | |
| 66 #include "runtime/task.hpp" | |
| 67 #include "runtime/threadCritical.hpp" | |
| 68 #include "runtime/threadLocalStorage.hpp" | |
| 69 #include "runtime/vframe.hpp" | |
| 70 #include "runtime/vframeArray.hpp" | |
| 71 #include "runtime/vframe_hp.hpp" | |
| 72 #include "runtime/vmThread.hpp" | |
| 73 #include "runtime/vm_operations.hpp" | |
| 74 #include "services/attachListener.hpp" | |
| 75 #include "services/management.hpp" | |
| 76 #include "services/threadService.hpp" | |
| 77 #include "utilities/defaultStream.hpp" | |
| 78 #include "utilities/dtrace.hpp" | |
| 79 #include "utilities/events.hpp" | |
| 80 #include "utilities/preserveException.hpp" | |
| 81 #ifdef TARGET_OS_FAMILY_linux | |
| 82 # include "os_linux.inline.hpp" | |
| 83 # include "thread_linux.inline.hpp" | |
| 84 #endif | |
| 85 #ifdef TARGET_OS_FAMILY_solaris | |
| 86 # include "os_solaris.inline.hpp" | |
| 87 # include "thread_solaris.inline.hpp" | |
| 88 #endif | |
| 89 #ifdef TARGET_OS_FAMILY_windows | |
| 90 # include "os_windows.inline.hpp" | |
| 91 # include "thread_windows.inline.hpp" | |
| 92 #endif | |
| 93 #ifndef SERIALGC | |
| 94 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 95 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 96 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 97 #endif | |
| 98 #ifdef COMPILER1 | |
| 99 #include "c1/c1_Compiler.hpp" | |
| 100 #endif | |
| 101 #ifdef COMPILER2 | |
| 102 #include "opto/c2compiler.hpp" | |
| 103 #include "opto/idealGraphPrinter.hpp" | |
| 104 #endif | |
| 0 | 105 |
| 106 #ifdef DTRACE_ENABLED | |
| 107 | |
| 108 // Only bother with this argument setup if dtrace is available | |
| 109 | |
| 110 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
| 111 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 112 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 113 intptr_t, intptr_t, bool); | |
| 114 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 115 intptr_t, intptr_t, bool); | |
| 116 | |
| 117 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 118 { \ | |
| 119 ResourceMark rm(this); \ | |
| 120 int len = 0; \ | |
| 121 const char* name = (javathread)->get_thread_name(); \ | |
| 122 len = strlen(name); \ | |
| 123 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 124 name, len, \ | |
| 125 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 126 (javathread)->osthread()->thread_id(), \ | |
| 127 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 128 } | |
| 129 | |
| 130 #else // ndef DTRACE_ENABLED | |
| 131 | |
| 132 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 133 | |
| 134 #endif // ndef DTRACE_ENABLED | |
| 135 | |
| 136 // Class hierarchy | |
| 137 // - Thread | |
| 138 // - VMThread | |
| 139 // - WatcherThread | |
| 140 // - ConcurrentMarkSweepThread | |
| 141 // - JavaThread | |
| 142 // - CompilerThread | |
| 143 | |
| 144 // ======= Thread ======== | |
| 145 | |
| 146 // Support for forcing alignment of thread objects for biased locking | |
| 147 void* Thread::operator new(size_t size) { | |
| 148 if (UseBiasedLocking) { | |
| 149 const int alignment = markOopDesc::biased_lock_alignment; | |
| 150 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 151 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 152 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 153 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 154 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 155 "JavaThread alignment code overflowed allocated storage"); | |
| 156 if (TraceBiasedLocking) { | |
| 157 if (aligned_addr != real_malloc_addr) | |
| 158 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 159 real_malloc_addr, aligned_addr); | |
| 160 } | |
| 161 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 162 return aligned_addr; | |
| 163 } else { | |
| 164 return CHeapObj::operator new(size); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 void Thread::operator delete(void* p) { | |
| 169 if (UseBiasedLocking) { | |
| 170 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 171 CHeapObj::operator delete(real_malloc_addr); | |
| 172 } else { | |
| 173 CHeapObj::operator delete(p); | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 | |
| 178 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 179 // JavaThread | |
| 180 | |
| 181 | |
| 182 Thread::Thread() { | |
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183 // stack and get_thread |
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184 set_stack_base(NULL); |
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185 set_stack_size(0); |
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186 set_self_raw_id(0); |
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187 set_lgrp_id(-1); |
| 0 | 188 |
| 189 // allocated data structures | |
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190 set_osthread(NULL); |
| 0 | 191 set_resource_area(new ResourceArea()); |
| 192 set_handle_area(new HandleArea(NULL)); | |
| 193 set_active_handles(NULL); | |
| 194 set_free_handle_block(NULL); | |
| 195 set_last_handle_mark(NULL); | |
| 196 | |
| 197 // This initial value ==> never claimed. | |
| 198 _oops_do_parity = 0; | |
| 199 | |
| 200 // the handle mark links itself to last_handle_mark | |
| 201 new HandleMark(this); | |
| 202 | |
| 203 // plain initialization | |
| 204 debug_only(_owned_locks = NULL;) | |
| 205 debug_only(_allow_allocation_count = 0;) | |
| 206 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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207 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 208 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 209 _jvmti_env_iteration_count = 0; | |
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210 set_allocated_bytes(0); |
| 0 | 211 _vm_operation_started_count = 0; |
| 212 _vm_operation_completed_count = 0; | |
| 213 _current_pending_monitor = NULL; | |
| 214 _current_pending_monitor_is_from_java = true; | |
| 215 _current_waiting_monitor = NULL; | |
| 216 _num_nested_signal = 0; | |
| 217 omFreeList = NULL ; | |
| 218 omFreeCount = 0 ; | |
| 219 omFreeProvision = 32 ; | |
| 1587 | 220 omInUseList = NULL ; |
| 221 omInUseCount = 0 ; | |
| 0 | 222 |
| 223 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 224 _suspend_flags = 0; | |
| 225 | |
| 226 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 227 _hashStateX = os::random() ; | |
| 228 _hashStateY = 842502087 ; | |
| 229 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 230 _hashStateW = 273326509 ; | |
| 231 | |
| 232 _OnTrap = 0 ; | |
| 233 _schedctl = NULL ; | |
| 234 _Stalled = 0 ; | |
| 235 _TypeTag = 0x2BAD ; | |
| 236 | |
| 237 // Many of the following fields are effectively final - immutable | |
| 238 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 239 // construct until the _MutexEvent is initialized ... | |
| 240 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 241 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 242 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 243 // and ::Release() | |
| 244 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 245 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 246 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 247 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 248 | |
| 249 #ifdef CHECK_UNHANDLED_OOPS | |
| 250 if (CheckUnhandledOops) { | |
| 251 _unhandled_oops = new UnhandledOops(this); | |
| 252 } | |
| 253 #endif // CHECK_UNHANDLED_OOPS | |
| 254 #ifdef ASSERT | |
| 255 if (UseBiasedLocking) { | |
| 256 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 257 assert(this == _real_malloc_address || | |
| 258 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 259 "bug in forced alignment of thread objects"); | |
| 260 } | |
| 261 #endif /* ASSERT */ | |
| 262 } | |
| 263 | |
| 264 void Thread::initialize_thread_local_storage() { | |
| 265 // Note: Make sure this method only calls | |
| 266 // non-blocking operations. Otherwise, it might not work | |
| 267 // with the thread-startup/safepoint interaction. | |
| 268 | |
| 269 // During Java thread startup, safepoint code should allow this | |
| 270 // method to complete because it may need to allocate memory to | |
| 271 // store information for the new thread. | |
| 272 | |
| 273 // initialize structure dependent on thread local storage | |
| 274 ThreadLocalStorage::set_thread(this); | |
| 275 | |
| 276 // set up any platform-specific state. | |
| 277 os::initialize_thread(); | |
| 278 | |
| 279 } | |
| 280 | |
| 281 void Thread::record_stack_base_and_size() { | |
| 282 set_stack_base(os::current_stack_base()); | |
| 283 set_stack_size(os::current_stack_size()); | |
| 284 } | |
| 285 | |
| 286 | |
| 287 Thread::~Thread() { | |
| 288 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 289 ObjectSynchronizer::omFlush (this) ; | |
| 290 | |
| 291 // deallocate data structures | |
| 292 delete resource_area(); | |
| 293 // since the handle marks are using the handle area, we have to deallocated the root | |
| 294 // handle mark before deallocating the thread's handle area, | |
| 295 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 296 delete last_handle_mark(); | |
| 297 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 298 | |
| 299 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 300 // We NULL out the fields for good hygiene. | |
| 301 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 302 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 303 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 304 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 305 | |
| 306 delete handle_area(); | |
| 307 | |
| 308 // osthread() can be NULL, if creation of thread failed. | |
| 309 if (osthread() != NULL) os::free_thread(osthread()); | |
| 310 | |
| 311 delete _SR_lock; | |
| 312 | |
| 313 // clear thread local storage if the Thread is deleting itself | |
| 314 if (this == Thread::current()) { | |
| 315 ThreadLocalStorage::set_thread(NULL); | |
| 316 } else { | |
| 317 // In the case where we're not the current thread, invalidate all the | |
| 318 // caches in case some code tries to get the current thread or the | |
| 319 // thread that was destroyed, and gets stale information. | |
| 320 ThreadLocalStorage::invalidate_all(); | |
| 321 } | |
| 322 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 323 } | |
| 324 | |
| 325 // NOTE: dummy function for assertion purpose. | |
| 326 void Thread::run() { | |
| 327 ShouldNotReachHere(); | |
| 328 } | |
| 329 | |
| 330 #ifdef ASSERT | |
| 331 // Private method to check for dangling thread pointer | |
| 332 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 333 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 334 "possibility of dangling Thread pointer"); | |
| 335 } | |
| 336 #endif | |
| 337 | |
| 338 | |
| 339 #ifndef PRODUCT | |
| 340 // Tracing method for basic thread operations | |
| 341 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 342 if (!TraceThreadEvents) return; | |
| 343 ResourceMark rm; | |
| 344 ThreadCritical tc; | |
| 345 const char *name = "non-Java thread"; | |
| 346 int prio = -1; | |
| 347 if (thread->is_Java_thread() | |
| 348 && !thread->is_Compiler_thread()) { | |
| 349 // The Threads_lock must be held to get information about | |
| 350 // this thread but may not be in some situations when | |
| 351 // tracing thread events. | |
| 352 bool release_Threads_lock = false; | |
| 353 if (!Threads_lock->owned_by_self()) { | |
| 354 Threads_lock->lock(); | |
| 355 release_Threads_lock = true; | |
| 356 } | |
| 357 JavaThread* jt = (JavaThread *)thread; | |
| 358 name = (char *)jt->get_thread_name(); | |
| 359 oop thread_oop = jt->threadObj(); | |
| 360 if (thread_oop != NULL) { | |
| 361 prio = java_lang_Thread::priority(thread_oop); | |
| 362 } | |
| 363 if (release_Threads_lock) { | |
| 364 Threads_lock->unlock(); | |
| 365 } | |
| 366 } | |
| 367 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 368 } | |
| 369 #endif | |
| 370 | |
| 371 | |
| 372 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 373 trace("get priority", thread); | |
| 374 ThreadPriority priority; | |
| 375 // Can return an error! | |
| 376 (void)os::get_priority(thread, priority); | |
| 377 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 378 return priority; | |
| 379 } | |
| 380 | |
| 381 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 382 trace("set priority", thread); | |
| 383 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 384 // Can return an error! | |
| 385 (void)os::set_priority(thread, priority); | |
| 386 } | |
| 387 | |
| 388 | |
| 389 void Thread::start(Thread* thread) { | |
| 390 trace("start", thread); | |
| 391 // Start is different from resume in that its safety is guaranteed by context or | |
| 392 // being called from a Java method synchronized on the Thread object. | |
| 393 if (!DisableStartThread) { | |
| 394 if (thread->is_Java_thread()) { | |
| 395 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 396 // Can not set it after the thread started because we do not know the | |
| 397 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 398 // in SLEEPING or some other state. | |
| 399 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 400 java_lang_Thread::RUNNABLE); | |
| 401 } | |
| 402 os::start_thread(thread); | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 407 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 408 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 409 VMThread::execute(vm_stop); | |
| 410 } | |
| 411 | |
| 412 | |
| 413 // | |
| 414 // Check if an external suspend request has completed (or has been | |
| 415 // cancelled). Returns true if the thread is externally suspended and | |
| 416 // false otherwise. | |
| 417 // | |
| 418 // The bits parameter returns information about the code path through | |
| 419 // the routine. Useful for debugging: | |
| 420 // | |
| 421 // set in is_ext_suspend_completed(): | |
| 422 // 0x00000001 - routine was entered | |
| 423 // 0x00000010 - routine return false at end | |
| 424 // 0x00000100 - thread exited (return false) | |
| 425 // 0x00000200 - suspend request cancelled (return false) | |
| 426 // 0x00000400 - thread suspended (return true) | |
| 427 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 428 // 0x00002000 - thread is native and walkable (return true) | |
| 429 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 430 // | |
| 431 // set in wait_for_ext_suspend_completion(): | |
| 432 // 0x00010000 - routine was entered | |
| 433 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 434 // 0x00040000 - thread suspended before loop (return true) | |
| 435 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 436 // 0x00100000 - thread suspended in loop (return true) | |
| 437 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 438 // | |
| 439 | |
| 440 // Helper class for tracing suspend wait debug bits. | |
| 441 // | |
| 442 // 0x00000100 indicates that the target thread exited before it could | |
| 443 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 444 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 445 // count as wait failures either. | |
| 446 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 447 | |
| 448 class TraceSuspendDebugBits : public StackObj { | |
| 449 private: | |
| 450 JavaThread * jt; | |
| 451 bool is_wait; | |
| 452 bool called_by_wait; // meaningful when !is_wait | |
| 453 uint32_t * bits; | |
| 454 | |
| 455 public: | |
| 456 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 457 uint32_t *_bits) { | |
| 458 jt = _jt; | |
| 459 is_wait = _is_wait; | |
| 460 called_by_wait = _called_by_wait; | |
| 461 bits = _bits; | |
| 462 } | |
| 463 | |
| 464 ~TraceSuspendDebugBits() { | |
| 465 if (!is_wait) { | |
| 466 #if 1 | |
| 467 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 468 // That trace is very chatty. | |
| 469 return; | |
| 470 #else | |
| 471 if (!called_by_wait) { | |
| 472 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 473 // trace calls to it from wait_for_ext_suspend_completion() | |
| 474 return; | |
| 475 } | |
| 476 #endif | |
| 477 } | |
| 478 | |
| 479 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 480 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 481 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 482 ResourceMark rm; | |
| 483 | |
| 484 tty->print_cr( | |
| 485 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 486 jt->get_thread_name(), *bits); | |
| 487 | |
| 488 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 489 } | |
| 490 } | |
| 491 } | |
| 492 }; | |
| 493 #undef DEBUG_FALSE_BITS | |
| 494 | |
| 495 | |
| 496 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 497 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 498 | |
| 499 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 500 bool do_trans_retry; // flag to force the retry | |
| 501 | |
| 502 *bits |= 0x00000001; | |
| 503 | |
| 504 do { | |
| 505 do_trans_retry = false; | |
| 506 | |
| 507 if (is_exiting()) { | |
| 508 // Thread is in the process of exiting. This is always checked | |
| 509 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 510 *bits |= 0x00000100; | |
| 511 return false; | |
| 512 } | |
| 513 | |
| 514 if (!is_external_suspend()) { | |
| 515 // Suspend request is cancelled. This is always checked before | |
| 516 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 517 // confusing the thread that made the suspend request. | |
| 518 *bits |= 0x00000200; | |
| 519 return false; | |
| 520 } | |
| 521 | |
| 522 if (is_ext_suspended()) { | |
| 523 // thread is suspended | |
| 524 *bits |= 0x00000400; | |
| 525 return true; | |
| 526 } | |
| 527 | |
| 528 // Now that we no longer do hard suspends of threads running | |
| 529 // native code, the target thread can be changing thread state | |
| 530 // while we are in this routine: | |
| 531 // | |
| 532 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 533 // | |
| 534 // We save a copy of the thread state as observed at this moment | |
| 535 // and make our decision about suspend completeness based on the | |
| 536 // copy. This closes the race where the thread state is seen as | |
| 537 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 538 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 539 JavaThreadState save_state = thread_state(); | |
| 540 | |
| 541 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 542 // If the thread's state is _thread_blocked and this blocking | |
| 543 // condition is known to be equivalent to a suspend, then we can | |
| 544 // consider the thread to be externally suspended. This means that | |
| 545 // the code that sets _thread_blocked has been modified to do | |
| 546 // self-suspension if the blocking condition releases. We also | |
| 547 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 548 // the _thread_blocked with self-suspension check. | |
| 549 // | |
| 550 // Return true since we wouldn't be here unless there was still an | |
| 551 // external suspend request. | |
| 552 *bits |= 0x00001000; | |
| 553 return true; | |
| 554 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 555 // Threads running native code will self-suspend on native==>VM/Java | |
| 556 // transitions. If its stack is walkable (should always be the case | |
| 557 // unless this function is called before the actual java_suspend() | |
| 558 // call), then the wait is done. | |
| 559 *bits |= 0x00002000; | |
| 560 return true; | |
| 561 } else if (!called_by_wait && !did_trans_retry && | |
| 562 save_state == _thread_in_native_trans && | |
| 563 frame_anchor()->walkable()) { | |
| 564 // The thread is transitioning from thread_in_native to another | |
| 565 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 566 // will force the thread to self-suspend. If it hasn't gotten | |
| 567 // there yet we may have caught the thread in-between the native | |
| 568 // code check above and the self-suspend. Lucky us. If we were | |
| 569 // called by wait_for_ext_suspend_completion(), then it | |
| 570 // will be doing the retries so we don't have to. | |
| 571 // | |
| 572 // Since we use the saved thread state in the if-statement above, | |
| 573 // there is a chance that the thread has already transitioned to | |
| 574 // _thread_blocked by the time we get here. In that case, we will | |
| 575 // make a single unnecessary pass through the logic below. This | |
| 576 // doesn't hurt anything since we still do the trans retry. | |
| 577 | |
| 578 *bits |= 0x00004000; | |
| 579 | |
| 580 // Once the thread leaves thread_in_native_trans for another | |
| 581 // thread state, we break out of this retry loop. We shouldn't | |
| 582 // need this flag to prevent us from getting back here, but | |
| 583 // sometimes paranoia is good. | |
| 584 did_trans_retry = true; | |
| 585 | |
| 586 // We wait for the thread to transition to a more usable state. | |
| 587 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 588 // We used to do an "os::yield_all(i)" call here with the intention | |
| 589 // that yielding would increase on each retry. However, the parameter | |
| 590 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 591 // on the SR_lock below provides a much more predictable scale up for | |
| 592 // the delay. It also provides a simple/direct point to check for any | |
| 593 // safepoint requests from the VMThread | |
| 594 | |
| 595 // temporarily drops SR_lock while doing wait with safepoint check | |
| 596 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 597 // and increase delay with each retry | |
| 598 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 599 | |
| 600 // check the actual thread state instead of what we saved above | |
| 601 if (thread_state() != _thread_in_native_trans) { | |
| 602 // the thread has transitioned to another thread state so | |
| 603 // try all the checks (except this one) one more time. | |
| 604 do_trans_retry = true; | |
| 605 break; | |
| 606 } | |
| 607 } // end retry loop | |
| 608 | |
| 609 | |
| 610 } | |
| 611 } while (do_trans_retry); | |
| 612 | |
| 613 *bits |= 0x00000010; | |
| 614 return false; | |
| 615 } | |
| 616 | |
| 617 // | |
| 618 // Wait for an external suspend request to complete (or be cancelled). | |
| 619 // Returns true if the thread is externally suspended and false otherwise. | |
| 620 // | |
| 621 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 622 uint32_t *bits) { | |
| 623 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 624 false /* !called_by_wait */, bits); | |
| 625 | |
| 626 // local flag copies to minimize SR_lock hold time | |
| 627 bool is_suspended; | |
| 628 bool pending; | |
| 629 uint32_t reset_bits; | |
| 630 | |
| 631 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 632 *bits |= 0x00010000; | |
| 633 | |
| 634 // We use reset_bits to reinitialize the bits value at the top of | |
| 635 // each retry loop. This allows the caller to make use of any | |
| 636 // unused bits for their own marking purposes. | |
| 637 reset_bits = *bits; | |
| 638 | |
| 639 { | |
| 640 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 641 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 642 delay, bits); | |
| 643 pending = is_external_suspend(); | |
| 644 } | |
| 645 // must release SR_lock to allow suspension to complete | |
| 646 | |
| 647 if (!pending) { | |
| 648 // A cancelled suspend request is the only false return from | |
| 649 // is_ext_suspend_completed() that keeps us from entering the | |
| 650 // retry loop. | |
| 651 *bits |= 0x00020000; | |
| 652 return false; | |
| 653 } | |
| 654 | |
| 655 if (is_suspended) { | |
| 656 *bits |= 0x00040000; | |
| 657 return true; | |
| 658 } | |
| 659 | |
| 660 for (int i = 1; i <= retries; i++) { | |
| 661 *bits = reset_bits; // reinit to only track last retry | |
| 662 | |
| 663 // We used to do an "os::yield_all(i)" call here with the intention | |
| 664 // that yielding would increase on each retry. However, the parameter | |
| 665 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 666 // on the SR_lock below provides a much more predictable scale up for | |
| 667 // the delay. It also provides a simple/direct point to check for any | |
| 668 // safepoint requests from the VMThread | |
| 669 | |
| 670 { | |
| 671 MutexLocker ml(SR_lock()); | |
| 672 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 673 // can also call this) and increase delay with each retry | |
| 674 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 675 | |
| 676 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 677 delay, bits); | |
| 678 | |
| 679 // It is possible for the external suspend request to be cancelled | |
| 680 // (by a resume) before the actual suspend operation is completed. | |
| 681 // Refresh our local copy to see if we still need to wait. | |
| 682 pending = is_external_suspend(); | |
| 683 } | |
| 684 | |
| 685 if (!pending) { | |
| 686 // A cancelled suspend request is the only false return from | |
| 687 // is_ext_suspend_completed() that keeps us from staying in the | |
| 688 // retry loop. | |
| 689 *bits |= 0x00080000; | |
| 690 return false; | |
| 691 } | |
| 692 | |
| 693 if (is_suspended) { | |
| 694 *bits |= 0x00100000; | |
| 695 return true; | |
| 696 } | |
| 697 } // end retry loop | |
| 698 | |
| 699 // thread did not suspend after all our retries | |
| 700 *bits |= 0x00200000; | |
| 701 return false; | |
| 702 } | |
| 703 | |
| 704 #ifndef PRODUCT | |
| 705 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 706 | |
| 707 // This should not need to be atomic as the only way for simultaneous | |
| 708 // updates is via interrupts. Even then this should be rare or non-existant | |
| 709 // and we don't care that much anyway. | |
| 710 | |
| 711 int index = _jmp_ring_index; | |
| 712 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 713 _jmp_ring[index]._target = (intptr_t) target; | |
| 714 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 715 _jmp_ring[index]._file = file; | |
| 716 _jmp_ring[index]._line = line; | |
| 717 } | |
| 718 #endif /* PRODUCT */ | |
| 719 | |
| 720 // Called by flat profiler | |
| 721 // Callers have already called wait_for_ext_suspend_completion | |
| 722 // The assertion for that is currently too complex to put here: | |
| 723 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 724 bool gotframe = false; | |
| 725 // self suspension saves needed state. | |
| 726 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 727 *_fr = pd_last_frame(); | |
| 728 gotframe = true; | |
| 729 } | |
| 730 return gotframe; | |
| 731 } | |
| 732 | |
| 733 void Thread::interrupt(Thread* thread) { | |
| 734 trace("interrupt", thread); | |
| 735 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 736 os::interrupt(thread); | |
| 737 } | |
| 738 | |
| 739 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 740 trace("is_interrupted", thread); | |
| 741 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 742 // Note: If clear_interrupted==false, this simply fetches and | |
| 743 // returns the value of the field osthread()->interrupted(). | |
| 744 return os::is_interrupted(thread, clear_interrupted); | |
| 745 } | |
| 746 | |
| 747 | |
| 748 // GC Support | |
| 749 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 750 jint thread_parity = _oops_do_parity; | |
| 751 if (thread_parity != strong_roots_parity) { | |
| 752 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
| 753 if (res == thread_parity) return true; | |
| 754 else { | |
| 755 guarantee(res == strong_roots_parity, "Or else what?"); | |
| 756 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 757 "Should only fail when parallel."); | |
| 758 return false; | |
| 759 } | |
| 760 } | |
| 761 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 762 "Should only fail when parallel."); | |
| 763 return false; | |
| 764 } | |
| 765 | |
|
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766 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 767 active_handles()->oops_do(f); |
| 768 // Do oop for ThreadShadow | |
| 769 f->do_oop((oop*)&_pending_exception); | |
| 770 handle_area()->oops_do(f); | |
| 771 } | |
| 772 | |
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773 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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774 // no nmethods in a generic thread... |
| 0 | 775 } |
| 776 | |
| 777 void Thread::print_on(outputStream* st) const { | |
| 778 // get_priority assumes osthread initialized | |
| 779 if (osthread() != NULL) { | |
| 780 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 781 osthread()->print_on(st); | |
| 782 } | |
| 783 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 784 } | |
| 785 | |
| 786 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 787 // any lock or allocate memory. | |
| 788 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 789 if (is_VM_thread()) st->print("VMThread"); | |
| 790 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 791 else if (is_Java_thread()) st->print("JavaThread"); | |
| 792 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 793 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 794 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 795 else st->print("Thread"); | |
| 796 | |
| 797 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 798 _stack_base - _stack_size, _stack_base); | |
| 799 | |
| 800 if (osthread()) { | |
| 801 st->print(" [id=%d]", osthread()->thread_id()); | |
| 802 } | |
| 803 } | |
| 804 | |
| 805 #ifdef ASSERT | |
| 806 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 807 Monitor *cur = _owned_locks; | |
| 808 if (cur == NULL) { | |
| 809 st->print(" (no locks) "); | |
| 810 } else { | |
| 811 st->print_cr(" Locks owned:"); | |
| 812 while(cur) { | |
| 813 cur->print_on(st); | |
| 814 cur = cur->next(); | |
| 815 } | |
| 816 } | |
| 817 } | |
| 818 | |
| 819 static int ref_use_count = 0; | |
| 820 | |
| 821 bool Thread::owns_locks_but_compiled_lock() const { | |
| 822 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 823 if (cur != Compile_lock) return true; | |
| 824 } | |
| 825 return false; | |
| 826 } | |
| 827 | |
| 828 | |
| 829 #endif | |
| 830 | |
| 831 #ifndef PRODUCT | |
| 832 | |
| 833 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 834 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 835 // no threads which allow_vm_block's are held | |
| 836 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 837 // Check if current thread is allowed to block at a safepoint | |
| 838 if (!(_allow_safepoint_count == 0)) | |
| 839 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 840 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 841 fatal("LEAF method calling lock?"); | |
| 842 } | |
| 843 | |
| 844 #ifdef ASSERT | |
| 845 if (potential_vm_operation && is_Java_thread() | |
| 846 && !Universe::is_bootstrapping()) { | |
| 847 // Make sure we do not hold any locks that the VM thread also uses. | |
| 848 // This could potentially lead to deadlocks | |
| 849 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 850 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 851 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 852 // since it is used to transfer control between JavaThreads and the VMThread | |
| 853 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 854 if ( (cur->allow_vm_block() && | |
| 855 cur != Threads_lock && | |
| 856 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 857 cur != VMOperationRequest_lock && | |
| 858 cur != VMOperationQueue_lock) || | |
| 859 cur->rank() == Mutex::special) { | |
| 860 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 861 } | |
| 862 } | |
| 863 } | |
| 864 | |
| 865 if (GCALotAtAllSafepoints) { | |
| 866 // We could enter a safepoint here and thus have a gc | |
| 867 InterfaceSupport::check_gc_alot(); | |
| 868 } | |
| 869 #endif | |
| 870 } | |
| 871 #endif | |
| 872 | |
| 873 bool Thread::is_in_stack(address adr) const { | |
| 874 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 875 address end = os::current_stack_pointer(); | |
| 876 if (stack_base() >= adr && adr >= end) return true; | |
| 877 | |
| 878 return false; | |
| 879 } | |
| 880 | |
| 881 | |
| 882 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 883 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 884 // used for compilation in the future. If that change is made, the need for these methods | |
| 885 // should be revisited, and they should be removed if possible. | |
| 886 | |
| 887 bool Thread::is_lock_owned(address adr) const { | |
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888 return on_local_stack(adr); |
| 0 | 889 } |
| 890 | |
| 891 bool Thread::set_as_starting_thread() { | |
| 892 // NOTE: this must be called inside the main thread. | |
| 893 return os::create_main_thread((JavaThread*)this); | |
| 894 } | |
| 895 | |
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896 static void initialize_class(Symbol* class_name, TRAPS) { |
| 0 | 897 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
| 898 instanceKlass::cast(klass)->initialize(CHECK); | |
| 899 } | |
| 900 | |
| 901 | |
| 902 // Creates the initial ThreadGroup | |
| 903 static Handle create_initial_thread_group(TRAPS) { | |
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904 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 905 instanceKlassHandle klass (THREAD, k); |
| 906 | |
| 907 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 908 { | |
| 909 JavaValue result(T_VOID); | |
| 910 JavaCalls::call_special(&result, | |
| 911 system_instance, | |
| 912 klass, | |
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913 vmSymbols::object_initializer_name(), |
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914 vmSymbols::void_method_signature(), |
| 0 | 915 CHECK_NH); |
| 916 } | |
| 917 Universe::set_system_thread_group(system_instance()); | |
| 918 | |
| 919 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 920 { | |
| 921 JavaValue result(T_VOID); | |
| 922 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 923 JavaCalls::call_special(&result, | |
| 924 main_instance, | |
| 925 klass, | |
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926 vmSymbols::object_initializer_name(), |
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927 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 928 system_instance, |
| 929 string, | |
| 930 CHECK_NH); | |
| 931 } | |
| 932 return main_instance; | |
| 933 } | |
| 934 | |
| 935 // Creates the initial Thread | |
| 936 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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937 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 938 instanceKlassHandle klass (THREAD, k); |
| 939 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 940 | |
| 941 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 942 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 943 thread->set_threadObj(thread_oop()); | |
| 944 | |
| 945 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 946 | |
| 947 JavaValue result(T_VOID); | |
| 948 JavaCalls::call_special(&result, thread_oop, | |
| 949 klass, | |
|
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950 vmSymbols::object_initializer_name(), |
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951 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 952 thread_group, |
| 953 string, | |
| 954 CHECK_NULL); | |
| 955 return thread_oop(); | |
| 956 } | |
| 957 | |
| 958 static void call_initializeSystemClass(TRAPS) { | |
|
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959 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 960 instanceKlassHandle klass (THREAD, k); |
| 961 | |
| 962 JavaValue result(T_VOID); | |
|
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963 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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964 vmSymbols::void_method_signature(), CHECK); |
| 0 | 965 } |
| 966 | |
|
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967 // General purpose hook into Java code, run once when the VM is initialized. |
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968 // The Java library method itself may be changed independently from the VM. |
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969 static void call_postVMInitHook(TRAPS) { |
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970 klassOop k = SystemDictionary::sun_misc_PostVMInitHook_klass(); |
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971 instanceKlassHandle klass (THREAD, k); |
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972 if (klass.not_null()) { |
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973 JavaValue result(T_VOID); |
|
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974 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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975 vmSymbols::void_method_signature(), |
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976 CHECK); |
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977 } |
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978 } |
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979 |
| 0 | 980 static void reset_vm_info_property(TRAPS) { |
| 981 // the vm info string | |
| 982 ResourceMark rm(THREAD); | |
| 983 const char *vm_info = VM_Version::vm_info_string(); | |
| 984 | |
| 985 // java.lang.System class | |
|
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986 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 987 instanceKlassHandle klass (THREAD, k); |
| 988 | |
| 989 // setProperty arguments | |
| 990 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 991 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 992 | |
| 993 // return value | |
| 994 JavaValue r(T_OBJECT); | |
| 995 | |
| 996 // public static String setProperty(String key, String value); | |
| 997 JavaCalls::call_static(&r, | |
| 998 klass, | |
|
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999 vmSymbols::setProperty_name(), |
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1000 vmSymbols::string_string_string_signature(), |
| 0 | 1001 key_str, |
| 1002 value_str, | |
| 1003 CHECK); | |
| 1004 } | |
| 1005 | |
| 1006 | |
| 1007 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1008 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1009 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1010 | |
|
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1011 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1012 instanceKlassHandle klass (THREAD, k); |
| 1013 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1014 | |
| 1015 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1016 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1017 set_threadObj(thread_oop()); | |
| 1018 | |
| 1019 JavaValue result(T_VOID); | |
| 1020 if (thread_name != NULL) { | |
| 1021 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1022 // Thread gets assigned specified name and null target | |
| 1023 JavaCalls::call_special(&result, | |
| 1024 thread_oop, | |
| 1025 klass, | |
|
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1026 vmSymbols::object_initializer_name(), |
|
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1027 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1028 thread_group, // Argument 1 |
| 1029 name, // Argument 2 | |
| 1030 THREAD); | |
| 1031 } else { | |
| 1032 // Thread gets assigned name "Thread-nnn" and null target | |
| 1033 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1034 JavaCalls::call_special(&result, | |
| 1035 thread_oop, | |
| 1036 klass, | |
|
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1037 vmSymbols::object_initializer_name(), |
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1038 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1039 thread_group, // Argument 1 |
| 1040 Handle(), // Argument 2 | |
| 1041 THREAD); | |
| 1042 } | |
| 1043 | |
| 1044 | |
| 1045 if (daemon) { | |
| 1046 java_lang_Thread::set_daemon(thread_oop()); | |
| 1047 } | |
| 1048 | |
| 1049 if (HAS_PENDING_EXCEPTION) { | |
| 1050 return; | |
| 1051 } | |
| 1052 | |
| 1142 | 1053 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1054 Handle threadObj(this, this->threadObj()); |
| 1055 | |
| 1056 JavaCalls::call_special(&result, | |
| 1057 thread_group, | |
| 1058 group, | |
|
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1059 vmSymbols::add_method_name(), |
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1060 vmSymbols::thread_void_signature(), |
| 0 | 1061 threadObj, // Arg 1 |
| 1062 THREAD); | |
| 1063 | |
| 1064 | |
| 1065 } | |
| 1066 | |
| 1067 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1068 // uniquely named instances should derive from this. | |
| 1069 NamedThread::NamedThread() : Thread() { | |
| 1070 _name = NULL; | |
|
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1071 _processed_thread = NULL; |
| 0 | 1072 } |
| 1073 | |
| 1074 NamedThread::~NamedThread() { | |
| 1075 if (_name != NULL) { | |
| 1076 FREE_C_HEAP_ARRAY(char, _name); | |
| 1077 _name = NULL; | |
| 1078 } | |
| 1079 } | |
| 1080 | |
| 1081 void NamedThread::set_name(const char* format, ...) { | |
| 1082 guarantee(_name == NULL, "Only get to set name once."); | |
| 1083 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 1084 guarantee(_name != NULL, "alloc failure"); | |
| 1085 va_list ap; | |
| 1086 va_start(ap, format); | |
| 1087 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1088 va_end(ap); | |
| 1089 } | |
| 1090 | |
| 1091 // ======= WatcherThread ======== | |
| 1092 | |
| 1093 // The watcher thread exists to simulate timer interrupts. It should | |
| 1094 // be replaced by an abstraction over whatever native support for | |
| 1095 // timer interrupts exists on the platform. | |
| 1096 | |
| 1097 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1098 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1099 |
| 1100 WatcherThread::WatcherThread() : Thread() { | |
| 1101 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1102 if (os::create_thread(this, os::watcher_thread)) { | |
| 1103 _watcher_thread = this; | |
| 1104 | |
| 1105 // Set the watcher thread to the highest OS priority which should not be | |
| 1106 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1107 // is created. The only normal thread using this priority is the reference | |
| 1108 // handler thread, which runs for very short intervals only. | |
| 1109 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1110 // will be inaccurate. | |
| 1111 os::set_priority(this, MaxPriority); | |
| 1112 if (!DisableStartThread) { | |
| 1113 os::start_thread(this); | |
| 1114 } | |
| 1115 } | |
| 1116 } | |
| 1117 | |
| 1118 void WatcherThread::run() { | |
| 1119 assert(this == watcher_thread(), "just checking"); | |
| 1120 | |
| 1121 this->record_stack_base_and_size(); | |
| 1122 this->initialize_thread_local_storage(); | |
| 1123 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1124 while(!_should_terminate) { | |
| 1125 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1126 assert(watcher_thread() == this, "thread consistency check"); | |
| 1127 | |
| 1128 // Calculate how long it'll be until the next PeriodicTask work | |
| 1129 // should be done, and sleep that amount of time. | |
|
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1130 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1131 |
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1132 // we expect this to timeout - we only ever get unparked when |
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1133 // we should terminate |
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1134 { |
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1135 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1136 |
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1137 jlong prev_time = os::javaTimeNanos(); |
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1138 for (;;) { |
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1139 int res= _SleepEvent->park(time_to_wait); |
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1140 if (res == OS_TIMEOUT || _should_terminate) |
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1141 break; |
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1142 // spurious wakeup of some kind |
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1143 jlong now = os::javaTimeNanos(); |
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1144 time_to_wait -= (now - prev_time) / 1000000; |
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1145 if (time_to_wait <= 0) |
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1146 break; |
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1147 prev_time = now; |
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1148 } |
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1149 } |
| 0 | 1150 |
| 1151 if (is_error_reported()) { | |
| 1152 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1153 // should abort JVM after creating an error log file. However in some | |
| 1154 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1155 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1156 // | |
| 1157 // This code is in WatcherThread because WatcherThread wakes up | |
| 1158 // periodically so the fatal error handler doesn't need to do anything; | |
| 1159 // also because the WatcherThread is less likely to crash than other | |
| 1160 // threads. | |
| 1161 | |
| 1162 for (;;) { | |
| 1163 if (!ShowMessageBoxOnError | |
| 1164 && (OnError == NULL || OnError[0] == '\0') | |
| 1165 && Arguments::abort_hook() == NULL) { | |
| 1166 os::sleep(this, 2 * 60 * 1000, false); | |
| 1167 fdStream err(defaultStream::output_fd()); | |
| 1168 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1169 // skip atexit/vm_exit/vm_abort hooks | |
| 1170 os::die(); | |
| 1171 } | |
| 1172 | |
| 1173 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1174 // ShowMessageBoxOnError when it is ready to abort. | |
| 1175 os::sleep(this, 5 * 1000, false); | |
| 1176 } | |
| 1177 } | |
| 1178 | |
| 1179 PeriodicTask::real_time_tick(time_to_wait); | |
| 1180 | |
| 1181 // If we have no more tasks left due to dynamic disenrollment, | |
| 1182 // shut down the thread since we don't currently support dynamic enrollment | |
| 1183 if (PeriodicTask::num_tasks() == 0) { | |
| 1184 _should_terminate = true; | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 // Signal that it is terminated | |
| 1189 { | |
| 1190 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1191 _watcher_thread = NULL; | |
| 1192 Terminator_lock->notify(); | |
| 1193 } | |
| 1194 | |
| 1195 // Thread destructor usually does this.. | |
| 1196 ThreadLocalStorage::set_thread(NULL); | |
| 1197 } | |
| 1198 | |
| 1199 void WatcherThread::start() { | |
| 1200 if (watcher_thread() == NULL) { | |
| 1201 _should_terminate = false; | |
| 1202 // Create the single instance of WatcherThread | |
| 1203 new WatcherThread(); | |
| 1204 } | |
| 1205 } | |
| 1206 | |
| 1207 void WatcherThread::stop() { | |
| 1208 // it is ok to take late safepoints here, if needed | |
| 1209 MutexLocker mu(Terminator_lock); | |
| 1210 _should_terminate = true; | |
|
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1211 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1212 |
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1213 Thread* watcher = watcher_thread(); |
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1214 if (watcher != NULL) |
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1215 watcher->_SleepEvent->unpark(); |
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1216 |
| 0 | 1217 while(watcher_thread() != NULL) { |
| 1218 // This wait should make safepoint checks, wait without a timeout, | |
| 1219 // and wait as a suspend-equivalent condition. | |
| 1220 // | |
| 1221 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1222 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1223 // FlatProfiler task, is waiting for the external suspend request on | |
| 1224 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1225 // eventually timeout, but that takes time. Making this wait a | |
| 1226 // suspend-equivalent condition solves that timeout problem. | |
| 1227 // | |
| 1228 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1229 Mutex::_as_suspend_equivalent_flag); | |
| 1230 } | |
| 1231 } | |
| 1232 | |
| 1233 void WatcherThread::print_on(outputStream* st) const { | |
| 1234 st->print("\"%s\" ", name()); | |
| 1235 Thread::print_on(st); | |
| 1236 st->cr(); | |
| 1237 } | |
| 1238 | |
| 1239 // ======= JavaThread ======== | |
| 1240 | |
| 1241 // A JavaThread is a normal Java thread | |
| 1242 | |
| 1243 void JavaThread::initialize() { | |
| 1244 // Initialize fields | |
|
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1245 |
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1246 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1247 set_claimed_par_id(-1); |
|
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1248 |
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1249 _env = NULL; |
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1250 _buffer_blob = NULL; |
| 0 | 1251 set_saved_exception_pc(NULL); |
| 1252 set_threadObj(NULL); | |
| 1253 _anchor.clear(); | |
| 1254 set_entry_point(NULL); | |
| 1255 set_jni_functions(jni_functions()); | |
| 1256 set_callee_target(NULL); | |
| 1257 set_vm_result(NULL); | |
| 1258 set_vm_result_2(NULL); | |
| 1259 set_vframe_array_head(NULL); | |
| 1260 set_vframe_array_last(NULL); | |
| 1261 set_deferred_locals(NULL); | |
| 1262 set_deopt_mark(NULL); | |
|
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1263 set_deopt_nmethod(NULL); |
| 0 | 1264 clear_must_deopt_id(); |
| 1265 set_monitor_chunks(NULL); | |
| 1266 set_next(NULL); | |
| 1267 set_thread_state(_thread_new); | |
| 1268 _terminated = _not_terminated; | |
| 1269 _privileged_stack_top = NULL; | |
| 1270 _array_for_gc = NULL; | |
| 1271 _suspend_equivalent = false; | |
| 1272 _in_deopt_handler = 0; | |
| 1273 _doing_unsafe_access = false; | |
| 1274 _stack_guard_state = stack_guard_unused; | |
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1275 _graal_deopt_info = NULL; |
| 0 | 1276 _exception_oop = NULL; |
| 1277 _exception_pc = 0; | |
| 1278 _exception_handler_pc = 0; | |
| 1279 _exception_stack_size = 0; | |
| 1903 | 1280 _is_method_handle_return = 0; |
| 0 | 1281 _jvmti_thread_state= NULL; |
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1282 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1283 _jvmti_get_loaded_classes_closure = NULL; |
| 1284 _interp_only_mode = 0; | |
| 1285 _special_runtime_exit_condition = _no_async_condition; | |
| 1286 _pending_async_exception = NULL; | |
| 1287 _is_compiling = false; | |
| 1288 _thread_stat = NULL; | |
| 1289 _thread_stat = new ThreadStatistics(); | |
| 1290 _blocked_on_compilation = false; | |
| 1291 _jni_active_critical = 0; | |
| 1292 _do_not_unlock_if_synchronized = false; | |
| 1293 _cached_monitor_info = NULL; | |
| 1294 _parker = Parker::Allocate(this) ; | |
| 1295 | |
| 1296 #ifndef PRODUCT | |
| 1297 _jmp_ring_index = 0; | |
| 1298 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1299 record_jump(NULL, NULL, NULL, 0); | |
| 1300 } | |
| 1301 #endif /* PRODUCT */ | |
| 1302 | |
| 1303 set_thread_profiler(NULL); | |
| 1304 if (FlatProfiler::is_active()) { | |
| 1305 // This is where we would decide to either give each thread it's own profiler | |
| 1306 // or use one global one from FlatProfiler, | |
| 1307 // or up to some count of the number of profiled threads, etc. | |
| 1308 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1309 pp->engage(); | |
| 1310 set_thread_profiler(pp); | |
| 1311 } | |
| 1312 | |
| 1313 // Setup safepoint state info for this thread | |
| 1314 ThreadSafepointState::create(this); | |
| 1315 | |
| 1316 debug_only(_java_call_counter = 0); | |
| 1317 | |
| 1318 // JVMTI PopFrame support | |
| 1319 _popframe_condition = popframe_inactive; | |
| 1320 _popframe_preserved_args = NULL; | |
| 1321 _popframe_preserved_args_size = 0; | |
| 1322 | |
| 1323 pd_initialize(); | |
| 1324 } | |
| 1325 | |
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1326 #ifndef SERIALGC |
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1327 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1328 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1329 #endif // !SERIALGC |
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1330 |
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1331 JavaThread::JavaThread(bool is_attaching) : |
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1332 Thread() |
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1333 #ifndef SERIALGC |
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1334 , _satb_mark_queue(&_satb_mark_queue_set), |
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1335 _dirty_card_queue(&_dirty_card_queue_set) |
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1336 #endif // !SERIALGC |
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1337 { |
| 0 | 1338 initialize(); |
| 1339 _is_attaching = is_attaching; | |
|
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1340 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 0 | 1341 } |
| 1342 | |
| 1343 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1344 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1345 return true; // Stack already guarded or guard pages not needed. | |
| 1346 } | |
| 1347 | |
| 1348 if (register_stack_overflow()) { | |
| 1349 // For those architectures which have separate register and | |
| 1350 // memory stacks, we must check the register stack to see if | |
| 1351 // it has overflowed. | |
| 1352 return false; | |
| 1353 } | |
| 1354 | |
| 1355 // Java code never executes within the yellow zone: the latter is only | |
| 1356 // there to provoke an exception during stack banging. If java code | |
| 1357 // is executing there, either StackShadowPages should be larger, or | |
| 1358 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1359 // when it should. | |
| 1360 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1361 | |
| 1362 enable_stack_yellow_zone(); | |
| 1363 return true; | |
| 1364 } | |
| 1365 | |
| 1366 bool JavaThread::reguard_stack(void) { | |
| 1367 return reguard_stack(os::current_stack_pointer()); | |
| 1368 } | |
| 1369 | |
| 1370 | |
| 1371 void JavaThread::block_if_vm_exited() { | |
| 1372 if (_terminated == _vm_exited) { | |
| 1373 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1374 // we will block here forever | |
| 1375 Threads_lock->lock_without_safepoint_check(); | |
| 1376 ShouldNotReachHere(); | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 | |
| 1381 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1382 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1383 | |
|
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1384 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1385 Thread() |
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1386 #ifndef SERIALGC |
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1387 , _satb_mark_queue(&_satb_mark_queue_set), |
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1388 _dirty_card_queue(&_dirty_card_queue_set) |
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1389 #endif // !SERIALGC |
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1390 { |
| 0 | 1391 if (TraceThreadEvents) { |
| 1392 tty->print_cr("creating thread %p", this); | |
| 1393 } | |
| 1394 initialize(); | |
| 1395 _is_attaching = false; | |
| 1396 set_entry_point(entry_point); | |
| 1397 // Create the native thread itself. | |
| 1398 // %note runtime_23 | |
| 1399 os::ThreadType thr_type = os::java_thread; | |
| 1400 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1401 os::java_thread; | |
| 1402 os::create_thread(this, thr_type, stack_sz); | |
| 1403 | |
| 1404 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1405 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1406 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1407 // the exception consists of creating the exception object & initializing it, initialization | |
| 1408 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1409 // | |
| 1410 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1411 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1412 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1413 // object must be fully initialized (take a look at JVM_Start) | |
| 1414 } | |
| 1415 | |
| 1416 JavaThread::~JavaThread() { | |
| 1417 if (TraceThreadEvents) { | |
| 1418 tty->print_cr("terminate thread %p", this); | |
| 1419 } | |
| 1420 | |
| 1421 // JSR166 -- return the parker to the free list | |
| 1422 Parker::Release(_parker); | |
| 1423 _parker = NULL ; | |
| 1424 | |
| 1425 // Free any remaining previous UnrollBlock | |
| 1426 vframeArray* old_array = vframe_array_last(); | |
| 1427 | |
| 1428 if (old_array != NULL) { | |
| 1429 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1430 old_array->set_unroll_block(NULL); | |
| 1431 delete old_info; | |
| 1432 delete old_array; | |
| 1433 } | |
| 1434 | |
| 1435 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1436 if (deferred != NULL) { | |
| 1437 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1438 assert(deferred->length() != 0, "empty array!"); | |
| 1439 do { | |
| 1440 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1441 deferred->remove_at(0); | |
| 1442 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1443 delete dlv; | |
| 1444 } while (deferred->length() != 0); | |
| 1445 delete deferred; | |
| 1446 } | |
| 1447 | |
| 1448 // All Java related clean up happens in exit | |
| 1449 ThreadSafepointState::destroy(this); | |
| 1450 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1451 if (_thread_stat != NULL) delete _thread_stat; | |
| 1452 } | |
| 1453 | |
| 1454 | |
| 1455 // The first routine called by a new Java thread | |
| 1456 void JavaThread::run() { | |
| 1457 // initialize thread-local alloc buffer related fields | |
| 1458 this->initialize_tlab(); | |
| 1459 | |
| 1460 // used to test validitity of stack trace backs | |
| 1461 this->record_base_of_stack_pointer(); | |
| 1462 | |
| 1463 // Record real stack base and size. | |
| 1464 this->record_stack_base_and_size(); | |
| 1465 | |
| 1466 // Initialize thread local storage; set before calling MutexLocker | |
| 1467 this->initialize_thread_local_storage(); | |
| 1468 | |
| 1469 this->create_stack_guard_pages(); | |
| 1470 | |
|
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1471 this->cache_global_variables(); |
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1472 |
| 0 | 1473 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1474 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1475 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1476 | |
| 1477 assert(JavaThread::current() == this, "sanity check"); | |
| 1478 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1479 | |
| 1480 DTRACE_THREAD_PROBE(start, this); | |
| 1481 | |
| 1482 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1483 // been completed. | |
| 1484 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1485 | |
| 1486 if (JvmtiExport::should_post_thread_life()) { | |
| 1487 JvmtiExport::post_thread_start(this); | |
| 1488 } | |
| 1489 | |
| 1490 // We call another function to do the rest so we are sure that the stack addresses used | |
| 1491 // from there will be lower than the stack base just computed | |
| 1492 thread_main_inner(); | |
| 1493 | |
| 1494 // Note, thread is no longer valid at this point! | |
| 1495 } | |
| 1496 | |
| 1497 | |
| 1498 void JavaThread::thread_main_inner() { | |
| 1499 assert(JavaThread::current() == this, "sanity check"); | |
| 1500 assert(this->threadObj() != NULL, "just checking"); | |
| 1501 | |
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1502 // Execute thread entry point unless this thread has a pending exception |
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1503 // or has been stopped before starting. |
| 0 | 1504 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1505 if (!this->has_pending_exception() && |
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1506 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 0 | 1507 HandleMark hm(this); |
| 1508 this->entry_point()(this, this); | |
| 1509 } | |
| 1510 | |
| 1511 DTRACE_THREAD_PROBE(stop, this); | |
| 1512 | |
| 1513 this->exit(false); | |
| 1514 delete this; | |
| 1515 } | |
| 1516 | |
| 1517 | |
| 1518 static void ensure_join(JavaThread* thread) { | |
| 1519 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1520 Handle threadObj(thread, thread->threadObj()); | |
| 1521 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1522 ObjectLocker lock(threadObj, thread); | |
| 1523 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1524 thread->clear_pending_exception(); | |
| 1525 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1526 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1527 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1528 // to complete once we've done the notify_all below |
| 0 | 1529 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1530 lock.notify_all(thread); | |
| 1531 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1532 thread->clear_pending_exception(); | |
| 1533 } | |
| 1534 | |
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1535 |
| 0 | 1536 // For any new cleanup additions, please check to see if they need to be applied to |
| 1537 // cleanup_failed_attach_current_thread as well. | |
| 1538 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1539 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1540 if (!InitializeJavaLangSystem) return; | |
| 1541 | |
| 1542 HandleMark hm(this); | |
| 1543 Handle uncaught_exception(this, this->pending_exception()); | |
| 1544 this->clear_pending_exception(); | |
| 1545 Handle threadObj(this, this->threadObj()); | |
| 1546 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1547 | |
| 1548 if (get_thread_profiler() != NULL) { | |
| 1549 get_thread_profiler()->disengage(); | |
| 1550 ResourceMark rm; | |
| 1551 get_thread_profiler()->print(get_thread_name()); | |
| 1552 } | |
| 1553 | |
| 1554 | |
| 1555 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1556 { | |
| 1557 EXCEPTION_MARK; | |
| 1558 | |
| 1559 CLEAR_PENDING_EXCEPTION; | |
| 1560 } | |
| 1561 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1562 // has to be fixed by a runtime query method | |
| 1563 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1564 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1565 // java.lang.Thread.dispatchUncaughtException | |
| 1566 if (uncaught_exception.not_null()) { | |
| 1567 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1568 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
| 1569 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
| 1570 { | |
| 1571 EXCEPTION_MARK; | |
| 1572 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1573 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1574 // so call ThreadGroup.uncaughtException() | |
| 1575 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1576 CallInfo callinfo; | |
| 1142 | 1577 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1578 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1579 vmSymbols::dispatchUncaughtException_name(), |
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1580 vmSymbols::throwable_void_signature(), |
| 0 | 1581 KlassHandle(), false, false, THREAD); |
| 1582 CLEAR_PENDING_EXCEPTION; | |
| 1583 methodHandle method = callinfo.selected_method(); | |
| 1584 if (method.not_null()) { | |
| 1585 JavaValue result(T_VOID); | |
| 1586 JavaCalls::call_virtual(&result, | |
| 1587 threadObj, thread_klass, | |
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1588 vmSymbols::dispatchUncaughtException_name(), |
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1589 vmSymbols::throwable_void_signature(), |
| 0 | 1590 uncaught_exception, |
| 1591 THREAD); | |
| 1592 } else { | |
| 1142 | 1593 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1594 JavaValue result(T_VOID); |
| 1595 JavaCalls::call_virtual(&result, | |
| 1596 group, thread_group, | |
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1597 vmSymbols::uncaughtException_name(), |
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1598 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1599 threadObj, // Arg 1 |
| 1600 uncaught_exception, // Arg 2 | |
| 1601 THREAD); | |
| 1602 } | |
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1603 if (HAS_PENDING_EXCEPTION) { |
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1604 ResourceMark rm(this); |
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1605 jio_fprintf(defaultStream::error_stream(), |
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1606 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1607 " in thread \"%s\"\n", |
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1608 Klass::cast(pending_exception()->klass())->external_name(), |
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1609 get_thread_name()); |
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1610 CLEAR_PENDING_EXCEPTION; |
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1611 } |
| 0 | 1612 } |
| 1613 } | |
| 1614 | |
| 1615 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
| 1616 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1617 // is deprecated anyhow. | |
| 1618 { int count = 3; | |
| 1619 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1620 EXCEPTION_MARK; | |
| 1621 JavaValue result(T_VOID); | |
| 1142 | 1622 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1623 JavaCalls::call_virtual(&result, |
| 1624 threadObj, thread_klass, | |
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1625 vmSymbols::exit_method_name(), |
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1626 vmSymbols::void_method_signature(), |
| 0 | 1627 THREAD); |
| 1628 CLEAR_PENDING_EXCEPTION; | |
| 1629 } | |
| 1630 } | |
| 1631 | |
| 1632 // notify JVMTI | |
| 1633 if (JvmtiExport::should_post_thread_life()) { | |
| 1634 JvmtiExport::post_thread_end(this); | |
| 1635 } | |
| 1636 | |
| 1637 // We have notified the agents that we are exiting, before we go on, | |
| 1638 // we must check for a pending external suspend request and honor it | |
| 1639 // in order to not surprise the thread that made the suspend request. | |
| 1640 while (true) { | |
| 1641 { | |
| 1642 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1643 if (!is_external_suspend()) { | |
| 1644 set_terminated(_thread_exiting); | |
| 1645 ThreadService::current_thread_exiting(this); | |
| 1646 break; | |
| 1647 } | |
| 1648 // Implied else: | |
| 1649 // Things get a little tricky here. We have a pending external | |
| 1650 // suspend request, but we are holding the SR_lock so we | |
| 1651 // can't just self-suspend. So we temporarily drop the lock | |
| 1652 // and then self-suspend. | |
| 1653 } | |
| 1654 | |
| 1655 ThreadBlockInVM tbivm(this); | |
| 1656 java_suspend_self(); | |
| 1657 | |
| 1658 // We're done with this suspend request, but we have to loop around | |
| 1659 // and check again. Eventually we will get SR_lock without a pending | |
| 1660 // external suspend request and will be able to mark ourselves as | |
| 1661 // exiting. | |
| 1662 } | |
| 1663 // no more external suspends are allowed at this point | |
| 1664 } else { | |
| 1665 // before_exit() has already posted JVMTI THREAD_END events | |
| 1666 } | |
| 1667 | |
| 1668 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1669 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1670 // group should have the destroyed bit set before waiters are notified). | |
| 1671 ensure_join(this); | |
| 1672 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1673 | |
| 1674 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1675 // held by this thread must be released. A detach operation must only | |
| 1676 // get here if there are no Java frames on the stack. Therefore, any | |
| 1677 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1678 // pre-inflated and in the monitor cache. | |
| 1679 // | |
| 1680 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1681 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1682 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1683 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1684 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1685 } | |
| 1686 | |
| 1687 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1688 // is in a consistent state, in case GC happens | |
| 1689 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1690 | |
| 1691 if (active_handles() != NULL) { | |
| 1692 JNIHandleBlock* block = active_handles(); | |
| 1693 set_active_handles(NULL); | |
| 1694 JNIHandleBlock::release_block(block); | |
| 1695 } | |
| 1696 | |
| 1697 if (free_handle_block() != NULL) { | |
| 1698 JNIHandleBlock* block = free_handle_block(); | |
| 1699 set_free_handle_block(NULL); | |
| 1700 JNIHandleBlock::release_block(block); | |
| 1701 } | |
| 1702 | |
| 1703 // These have to be removed while this is still a valid thread. | |
| 1704 remove_stack_guard_pages(); | |
| 1705 | |
| 1706 if (UseTLAB) { | |
| 1707 tlab().make_parsable(true); // retire TLAB | |
| 1708 } | |
| 1709 | |
|
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1710 if (JvmtiEnv::environments_might_exist()) { |
|
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1711 JvmtiExport::cleanup_thread(this); |
|
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1712 } |
|
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1713 |
|
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1714 #ifndef SERIALGC |
|
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1715 // We must flush G1-related buffers before removing a thread from |
|
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1716 // the list of active threads. |
|
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1717 if (UseG1GC) { |
|
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1718 flush_barrier_queues(); |
|
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1719 } |
|
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1720 #endif |
|
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1721 |
| 0 | 1722 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1723 Threads::remove(this); | |
| 1724 } | |
| 1725 | |
|
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1726 #ifndef SERIALGC |
|
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1727 // Flush G1-related queues. |
|
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1728 void JavaThread::flush_barrier_queues() { |
|
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|
1729 satb_mark_queue().flush(); |
|
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1730 dirty_card_queue().flush(); |
|
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1731 } |
|
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1732 |
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|
1733 void JavaThread::initialize_queues() { |
|
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|
1734 assert(!SafepointSynchronize::is_at_safepoint(), |
|
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|
1735 "we should not be at a safepoint"); |
|
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1736 |
|
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1737 ObjPtrQueue& satb_queue = satb_mark_queue(); |
|
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1738 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
|
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1739 // The SATB queue should have been constructed with its active |
|
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1740 // field set to false. |
|
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1741 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
|
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1742 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
|
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1743 // If we are creating the thread during a marking cycle, we should |
|
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1744 // set the active field of the SATB queue to true. |
|
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1745 if (satb_queue_set.is_active()) { |
|
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|
1746 satb_queue.set_active(true); |
|
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1747 } |
|
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1748 |
|
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|
1749 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
|
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1750 // The dirty card queue should have been constructed with its |
|
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|
1751 // active field set to true. |
|
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|
1752 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
|
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|
1753 } |
|
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1754 #endif // !SERIALGC |
|
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1755 |
| 0 | 1756 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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|
1757 if (get_thread_profiler() != NULL) { |
|
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|
1758 get_thread_profiler()->disengage(); |
|
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|
1759 ResourceMark rm; |
|
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|
1760 get_thread_profiler()->print(get_thread_name()); |
|
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|
1761 } |
|
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1762 |
|
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1763 if (active_handles() != NULL) { |
|
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1764 JNIHandleBlock* block = active_handles(); |
|
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|
1765 set_active_handles(NULL); |
|
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1766 JNIHandleBlock::release_block(block); |
|
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|
1767 } |
|
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1768 |
|
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1769 if (free_handle_block() != NULL) { |
|
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1770 JNIHandleBlock* block = free_handle_block(); |
|
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1771 set_free_handle_block(NULL); |
|
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|
1772 JNIHandleBlock::release_block(block); |
|
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|
1773 } |
|
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1774 |
|
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1775 // These have to be removed while this is still a valid thread. |
|
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1776 remove_stack_guard_pages(); |
|
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1777 |
|
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1778 if (UseTLAB) { |
|
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1779 tlab().make_parsable(true); // retire TLAB, if any |
|
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|
1780 } |
|
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1781 |
|
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|
1782 #ifndef SERIALGC |
|
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1783 if (UseG1GC) { |
|
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|
1784 flush_barrier_queues(); |
|
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|
1785 } |
|
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|
1786 #endif |
|
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1787 |
|
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|
1788 Threads::remove(this); |
|
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|
1789 delete this; |
| 0 | 1790 } |
| 1791 | |
| 1792 | |
|
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1793 |
|
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|
1794 |
| 0 | 1795 JavaThread* JavaThread::active() { |
| 1796 Thread* thread = ThreadLocalStorage::thread(); | |
| 1797 assert(thread != NULL, "just checking"); | |
| 1798 if (thread->is_Java_thread()) { | |
| 1799 return (JavaThread*) thread; | |
| 1800 } else { | |
| 1801 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1802 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1803 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1804 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1805 return ret; | |
| 1806 } | |
| 1807 } | |
| 1808 | |
| 1809 bool JavaThread::is_lock_owned(address adr) const { | |
|
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|
1810 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1811 |
| 1812 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1813 if (chunk->contains(adr)) return true; | |
| 1814 } | |
| 1815 | |
| 1816 return false; | |
| 1817 } | |
| 1818 | |
| 1819 | |
| 1820 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1821 chunk->set_next(monitor_chunks()); | |
| 1822 set_monitor_chunks(chunk); | |
| 1823 } | |
| 1824 | |
| 1825 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1826 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1827 if (monitor_chunks() == chunk) { | |
| 1828 set_monitor_chunks(chunk->next()); | |
| 1829 } else { | |
| 1830 MonitorChunk* prev = monitor_chunks(); | |
| 1831 while (prev->next() != chunk) prev = prev->next(); | |
| 1832 prev->set_next(chunk->next()); | |
| 1833 } | |
| 1834 } | |
| 1835 | |
| 1836 // JVM support. | |
| 1837 | |
| 1838 // Note: this function shouldn't block if it's called in | |
| 1839 // _thread_in_native_trans state (such as from | |
| 1840 // check_special_condition_for_native_trans()). | |
| 1841 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1842 | |
| 1843 if (has_last_Java_frame() && has_async_condition()) { | |
| 1844 // If we are at a polling page safepoint (not a poll return) | |
| 1845 // then we must defer async exception because live registers | |
| 1846 // will be clobbered by the exception path. Poll return is | |
| 1847 // ok because the call we a returning from already collides | |
| 1848 // with exception handling registers and so there is no issue. | |
| 1849 // (The exception handling path kills call result registers but | |
| 1850 // this is ok since the exception kills the result anyway). | |
| 1851 | |
| 1852 if (is_at_poll_safepoint()) { | |
| 1853 // if the code we are returning to has deoptimized we must defer | |
| 1854 // the exception otherwise live registers get clobbered on the | |
| 1855 // exception path before deoptimization is able to retrieve them. | |
| 1856 // | |
| 1857 RegisterMap map(this, false); | |
| 1858 frame caller_fr = last_frame().sender(&map); | |
| 1859 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1860 if (caller_fr.is_deoptimized_frame()) { | |
| 1861 if (TraceExceptions) { | |
| 1862 ResourceMark rm; | |
| 1863 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1864 } | |
| 1865 return; | |
| 1866 } | |
| 1867 } | |
| 1868 } | |
| 1869 | |
| 1870 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1871 if (condition == _no_async_condition) { | |
| 1872 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1873 // was called: | |
| 1874 // - if we were here only because of an external suspend request, | |
| 1875 // then that was taken care of above (or cancelled) so we are done | |
| 1876 // - if we were here because of another async request, then it has | |
| 1877 // been cleared between the has_special_runtime_exit_condition() | |
| 1878 // and now so again we are done | |
| 1879 return; | |
| 1880 } | |
| 1881 | |
| 1882 // Check for pending async. exception | |
| 1883 if (_pending_async_exception != NULL) { | |
| 1884 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 1885 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1886 |
| 1887 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1888 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1889 | |
| 1890 if (TraceExceptions) { | |
| 1891 ResourceMark rm; | |
| 1892 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1893 if (has_last_Java_frame() ) { | |
| 1894 frame f = last_frame(); | |
| 1895 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1896 } | |
| 1897 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1898 } | |
| 1899 _pending_async_exception = NULL; | |
| 1900 clear_has_async_exception(); | |
| 1901 } | |
| 1902 } | |
| 1903 | |
| 1904 if (check_unsafe_error && | |
| 1905 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1906 condition = _no_async_condition; // done | |
| 1907 switch (thread_state()) { | |
| 1908 case _thread_in_vm: | |
| 1909 { | |
| 1910 JavaThread* THREAD = this; | |
| 1911 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1912 } | |
| 1913 case _thread_in_native: | |
| 1914 { | |
| 1915 ThreadInVMfromNative tiv(this); | |
| 1916 JavaThread* THREAD = this; | |
| 1917 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1918 } | |
| 1919 case _thread_in_Java: | |
| 1920 { | |
| 1921 ThreadInVMfromJava tiv(this); | |
| 1922 JavaThread* THREAD = this; | |
| 1923 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1924 } | |
| 1925 default: | |
| 1926 ShouldNotReachHere(); | |
| 1927 } | |
| 1928 } | |
| 1929 | |
| 1930 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1931 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1932 "must have handled the async condition, if no exception"); | |
| 1933 } | |
| 1934 | |
| 1935 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1936 // | |
| 1937 // Check for pending external suspend. Internal suspend requests do | |
| 1938 // not use handle_special_runtime_exit_condition(). | |
| 1939 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1940 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1941 // threads could call into the VM with another thread's JNIEnv so we | |
| 1942 // can be here operating on behalf of a suspended thread (4432884). | |
| 1943 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1944 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1945 // | |
| 1946 // Because thread is external suspended the safepoint code will count | |
| 1947 // thread as at a safepoint. This can be odd because we can be here | |
| 1948 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 1949 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 1950 // before calling java_suspend_self like all other callers of it but | |
| 1951 // we must then observe proper safepoint protocol. (We can't leave | |
| 1952 // _thread_blocked with a safepoint in progress). However we can be | |
| 1953 // here as _thread_in_native_trans so we can't use a normal transition | |
| 1954 // constructor/destructor pair because they assert on that type of | |
| 1955 // transition. We could do something like: | |
| 1956 // | |
| 1957 // JavaThreadState state = thread_state(); | |
| 1958 // set_thread_state(_thread_in_vm); | |
| 1959 // { | |
| 1960 // ThreadBlockInVM tbivm(this); | |
| 1961 // java_suspend_self() | |
| 1962 // } | |
| 1963 // set_thread_state(_thread_in_vm_trans); | |
| 1964 // if (safepoint) block; | |
| 1965 // set_thread_state(state); | |
| 1966 // | |
| 1967 // but that is pretty messy. Instead we just go with the way the | |
| 1968 // code has worked before and note that this is the only path to | |
| 1969 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 1970 // mode. | |
| 1971 | |
| 1972 frame_anchor()->make_walkable(this); | |
| 1973 java_suspend_self(); | |
| 1974 | |
| 1975 // We might be here for reasons in addition to the self-suspend request | |
| 1976 // so check for other async requests. | |
| 1977 } | |
| 1978 | |
| 1979 if (check_asyncs) { | |
| 1980 check_and_handle_async_exceptions(); | |
| 1981 } | |
| 1982 } | |
| 1983 | |
| 1984 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 1985 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 1986 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 1987 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 1988 | |
| 1989 // Do not throw asynchronous exceptions against the compiler thread | |
| 1990 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
|
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1991 |
|
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1992 // (tw) May we do this? |
|
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|
1993 //if (is_Compiler_thread()) return; |
| 0 | 1994 |
| 1995 { | |
| 1996 // Actually throw the Throwable against the target Thread - however | |
| 1997 // only if there is no thread death exception installed already. | |
| 1142 | 1998 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1999 // If the topmost frame is a runtime stub, then we are calling into |
| 2000 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2001 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2002 // may not be valid | |
| 2003 if (has_last_Java_frame()) { | |
| 2004 frame f = last_frame(); | |
| 2005 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2006 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2007 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2008 frame compiled_frame = f.sender(®_map); | |
| 2009 if (compiled_frame.can_be_deoptimized()) { | |
| 2010 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2011 } | |
| 2012 } | |
| 2013 } | |
| 2014 | |
| 2015 // Set async. pending exception in thread. | |
| 2016 set_pending_async_exception(java_throwable); | |
| 2017 | |
| 2018 if (TraceExceptions) { | |
| 2019 ResourceMark rm; | |
| 2020 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 2021 } | |
| 2022 // for AbortVMOnException flag | |
| 2023 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 2024 } | |
| 2025 } | |
| 2026 | |
| 2027 | |
| 2028 // Interrupt thread so it will wake up from a potential wait() | |
| 2029 Thread::interrupt(this); | |
| 2030 } | |
| 2031 | |
| 2032 // External suspension mechanism. | |
| 2033 // | |
| 2034 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2035 // to any VM_locks and it is at a transition | |
| 2036 // Self-suspension will happen on the transition out of the vm. | |
| 2037 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2038 // | |
| 2039 // Guarantees on return: | |
| 2040 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2041 // force a safepoint) | |
| 2042 // + Target thread will not enter any new monitors | |
| 2043 // | |
| 2044 void JavaThread::java_suspend() { | |
| 2045 { MutexLocker mu(Threads_lock); | |
| 2046 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2047 return; | |
| 2048 } | |
| 2049 } | |
| 2050 | |
| 2051 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2052 if (!is_external_suspend()) { | |
| 2053 // a racing resume has cancelled us; bail out now | |
| 2054 return; | |
| 2055 } | |
| 2056 | |
| 2057 // suspend is done | |
| 2058 uint32_t debug_bits = 0; | |
| 2059 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2060 // SR_lock to allow the thread to reach a stable thread state if | |
| 2061 // it is currently in a transient thread state. | |
| 2062 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2063 SuspendRetryDelay, &debug_bits) ) { | |
| 2064 return; | |
| 2065 } | |
| 2066 } | |
| 2067 | |
| 2068 VM_ForceSafepoint vm_suspend; | |
| 2069 VMThread::execute(&vm_suspend); | |
| 2070 } | |
| 2071 | |
| 2072 // Part II of external suspension. | |
| 2073 // A JavaThread self suspends when it detects a pending external suspend | |
| 2074 // request. This is usually on transitions. It is also done in places | |
| 2075 // where continuing to the next transition would surprise the caller, | |
| 2076 // e.g., monitor entry. | |
| 2077 // | |
| 2078 // Returns the number of times that the thread self-suspended. | |
| 2079 // | |
| 2080 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2081 // thread. java_suspend_self() is the second stage of cooperative | |
| 2082 // suspension for external suspend requests and should only be used | |
| 2083 // to complete an external suspend request. | |
| 2084 // | |
| 2085 int JavaThread::java_suspend_self() { | |
| 2086 int ret = 0; | |
| 2087 | |
| 2088 // we are in the process of exiting so don't suspend | |
| 2089 if (is_exiting()) { | |
| 2090 clear_external_suspend(); | |
| 2091 return ret; | |
| 2092 } | |
| 2093 | |
| 2094 assert(_anchor.walkable() || | |
| 2095 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2096 "must have walkable stack"); | |
| 2097 | |
| 2098 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2099 | |
| 979 | 2100 assert(!this->is_ext_suspended(), |
| 0 | 2101 "a thread trying to self-suspend should not already be suspended"); |
| 2102 | |
| 2103 if (this->is_suspend_equivalent()) { | |
| 2104 // If we are self-suspending as a result of the lifting of a | |
| 2105 // suspend equivalent condition, then the suspend_equivalent | |
| 2106 // flag is not cleared until we set the ext_suspended flag so | |
| 2107 // that wait_for_ext_suspend_completion() returns consistent | |
| 2108 // results. | |
| 2109 this->clear_suspend_equivalent(); | |
| 2110 } | |
| 2111 | |
| 2112 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2113 // above. Or another external suspend request could be waiting for us | |
| 2114 // by the time we return from SR_lock()->wait(). The thread | |
| 2115 // that requested the suspension may already be trying to walk our | |
| 2116 // stack and if we return now, we can change the stack out from under | |
| 2117 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2118 // to crash. We stay self-suspended until there are no more pending | |
| 2119 // external suspend requests. | |
| 2120 while (is_external_suspend()) { | |
| 2121 ret++; | |
| 2122 this->set_ext_suspended(); | |
| 2123 | |
| 2124 // _ext_suspended flag is cleared by java_resume() | |
| 2125 while (is_ext_suspended()) { | |
| 2126 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2127 } | |
| 2128 } | |
| 2129 | |
| 2130 return ret; | |
| 2131 } | |
| 2132 | |
| 2133 #ifdef ASSERT | |
| 2134 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2135 // hence doesn't need protection from concurrent access at this stage | |
| 2136 void JavaThread::verify_not_published() { | |
| 2137 if (!Threads_lock->owned_by_self()) { | |
| 2138 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2139 assert( !Threads::includes(this), | |
| 2140 "java thread shouldn't have been published yet!"); | |
| 2141 } | |
| 2142 else { | |
| 2143 assert( !Threads::includes(this), | |
| 2144 "java thread shouldn't have been published yet!"); | |
| 2145 } | |
| 2146 } | |
| 2147 #endif | |
| 2148 | |
| 2149 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2150 // progress or when _suspend_flags is non-zero. | |
| 2151 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2152 // block if a safepoint is in progress. | |
| 2153 // Async exception ISN'T checked. | |
| 2154 // Note only the ThreadInVMfromNative transition can call this function | |
| 2155 // directly and when thread state is _thread_in_native_trans | |
| 2156 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2157 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2158 | |
| 2159 JavaThread *curJT = JavaThread::current(); | |
| 2160 bool do_self_suspend = thread->is_external_suspend(); | |
| 2161 | |
| 2162 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2163 | |
| 2164 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2165 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2166 // threads could call into the VM with another thread's JNIEnv so we | |
| 2167 // can be here operating on behalf of a suspended thread (4432884). | |
| 2168 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2169 JavaThreadState state = thread->thread_state(); | |
| 2170 | |
| 2171 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2172 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2173 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2174 thread->set_suspend_equivalent(); | |
| 2175 | |
| 2176 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2177 // wait until the thread changes to other thread state. There is no | |
| 2178 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2179 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2180 // too long. Temporarily change the state to _thread_blocked to | |
| 2181 // let the VM thread know that this thread is ready for GC. The problem | |
| 2182 // of changing thread state is that safepoint could happen just after | |
| 2183 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2184 // see the _thread_blocked state. We must check for safepoint | |
| 2185 // after restoring the state and make sure we won't leave while a safepoint | |
| 2186 // is in progress. | |
| 2187 thread->set_thread_state(_thread_blocked); | |
| 2188 thread->java_suspend_self(); | |
| 2189 thread->set_thread_state(state); | |
| 2190 // Make sure new state is seen by VM thread | |
| 2191 if (os::is_MP()) { | |
| 2192 if (UseMembar) { | |
| 2193 // Force a fence between the write above and read below | |
| 2194 OrderAccess::fence(); | |
| 2195 } else { | |
| 2196 // Must use this rather than serialization page in particular on Windows | |
| 2197 InterfaceSupport::serialize_memory(thread); | |
| 2198 } | |
| 2199 } | |
| 2200 } | |
| 2201 | |
| 2202 if (SafepointSynchronize::do_call_back()) { | |
| 2203 // If we are safepointing, then block the caller which may not be | |
| 2204 // the same as the target thread (see above). | |
| 2205 SafepointSynchronize::block(curJT); | |
| 2206 } | |
| 2207 | |
| 2208 if (thread->is_deopt_suspend()) { | |
| 2209 thread->clear_deopt_suspend(); | |
| 2210 RegisterMap map(thread, false); | |
| 2211 frame f = thread->last_frame(); | |
| 2212 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2213 f = f.sender(&map); | |
| 2214 } | |
| 2215 if (f.id() == thread->must_deopt_id()) { | |
| 2216 thread->clear_must_deopt_id(); | |
|
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2217 f.deoptimize(thread); |
| 0 | 2218 } else { |
| 2219 fatal("missed deoptimization!"); | |
| 2220 } | |
| 2221 } | |
| 2222 } | |
| 2223 | |
| 2224 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2225 // progress or when _suspend_flags is non-zero. | |
| 2226 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2227 // block if a safepoint is in progress. | |
| 2228 // Also check for pending async exception (not including unsafe access error). | |
| 2229 // Note only the native==>VM/Java barriers can call this function and when | |
| 2230 // thread state is _thread_in_native_trans. | |
| 2231 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2232 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2233 | |
| 2234 if (thread->has_async_exception()) { | |
| 2235 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2236 // access error since that may block. | |
| 2237 thread->check_and_handle_async_exceptions(false); | |
| 2238 } | |
| 2239 } | |
| 2240 | |
| 2241 // We need to guarantee the Threads_lock here, since resumes are not | |
| 2242 // allowed during safepoint synchronization | |
| 2243 // Can only resume from an external suspension | |
| 2244 void JavaThread::java_resume() { | |
| 2245 assert_locked_or_safepoint(Threads_lock); | |
| 2246 | |
| 2247 // Sanity check: thread is gone, has started exiting or the thread | |
| 2248 // was not externally suspended. | |
| 2249 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2250 return; | |
| 2251 } | |
| 2252 | |
| 2253 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2254 | |
| 2255 clear_external_suspend(); | |
| 2256 | |
| 2257 if (is_ext_suspended()) { | |
| 2258 clear_ext_suspended(); | |
| 2259 SR_lock()->notify_all(); | |
| 2260 } | |
| 2261 } | |
| 2262 | |
| 2263 void JavaThread::create_stack_guard_pages() { | |
| 2264 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2265 address low_addr = stack_base() - stack_size(); | |
| 2266 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2267 | |
| 2268 int allocate = os::allocate_stack_guard_pages(); | |
| 2269 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2270 | |
|
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|
2271 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2272 warning("Attempt to allocate stack guard pages failed."); |
| 2273 return; | |
| 2274 } | |
| 2275 | |
| 2276 if (os::guard_memory((char *) low_addr, len)) { | |
| 2277 _stack_guard_state = stack_guard_enabled; | |
| 2278 } else { | |
| 2279 warning("Attempt to protect stack guard pages failed."); | |
| 2280 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2281 warning("Attempt to deallocate stack guard pages failed."); | |
| 2282 } | |
| 2283 } | |
| 2284 } | |
| 2285 | |
| 2286 void JavaThread::remove_stack_guard_pages() { | |
| 2287 if (_stack_guard_state == stack_guard_unused) return; | |
| 2288 address low_addr = stack_base() - stack_size(); | |
| 2289 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2290 | |
| 2291 if (os::allocate_stack_guard_pages()) { | |
|
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2292 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2293 _stack_guard_state = stack_guard_unused; |
| 2294 } else { | |
| 2295 warning("Attempt to deallocate stack guard pages failed."); | |
| 2296 } | |
| 2297 } else { | |
| 2298 if (_stack_guard_state == stack_guard_unused) return; | |
| 2299 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2300 _stack_guard_state = stack_guard_unused; | |
| 2301 } else { | |
| 2302 warning("Attempt to unprotect stack guard pages failed."); | |
| 2303 } | |
| 2304 } | |
| 2305 } | |
| 2306 | |
| 2307 void JavaThread::enable_stack_yellow_zone() { | |
| 2308 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2309 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2310 | |
| 2311 // The base notation is from the stacks point of view, growing downward. | |
| 2312 // We need to adjust it to work correctly with guard_memory() | |
| 2313 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2314 | |
| 2315 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2316 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2317 | |
| 2318 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2319 _stack_guard_state = stack_guard_enabled; | |
| 2320 } else { | |
| 2321 warning("Attempt to guard stack yellow zone failed."); | |
| 2322 } | |
| 2323 enable_register_stack_guard(); | |
| 2324 } | |
| 2325 | |
| 2326 void JavaThread::disable_stack_yellow_zone() { | |
| 2327 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2328 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2329 | |
| 2330 // Simply return if called for a thread that does not use guard pages. | |
| 2331 if (_stack_guard_state == stack_guard_unused) return; | |
| 2332 | |
| 2333 // The base notation is from the stacks point of view, growing downward. | |
| 2334 // We need to adjust it to work correctly with guard_memory() | |
| 2335 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2336 | |
| 2337 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2338 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2339 } else { | |
| 2340 warning("Attempt to unguard stack yellow zone failed."); | |
| 2341 } | |
| 2342 disable_register_stack_guard(); | |
| 2343 } | |
| 2344 | |
| 2345 void JavaThread::enable_stack_red_zone() { | |
| 2346 // The base notation is from the stacks point of view, growing downward. | |
| 2347 // We need to adjust it to work correctly with guard_memory() | |
| 2348 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2349 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2350 | |
| 2351 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2352 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2353 | |
| 2354 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2355 warning("Attempt to guard stack red zone failed."); | |
| 2356 } | |
| 2357 } | |
| 2358 | |
| 2359 void JavaThread::disable_stack_red_zone() { | |
| 2360 // The base notation is from the stacks point of view, growing downward. | |
| 2361 // We need to adjust it to work correctly with guard_memory() | |
| 2362 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2363 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2364 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2365 warning("Attempt to unguard stack red zone failed."); | |
| 2366 } | |
| 2367 } | |
| 2368 | |
| 2369 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2370 // ignore is there is no stack | |
| 2371 if (!has_last_Java_frame()) return; | |
| 2372 // traverse the stack frames. Starts from top frame. | |
| 2373 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2374 frame* fr = fst.current(); | |
| 2375 f(fr, fst.register_map()); | |
| 2376 } | |
| 2377 } | |
| 2378 | |
| 2379 | |
| 2380 #ifndef PRODUCT | |
| 2381 // Deoptimization | |
| 2382 // Function for testing deoptimization | |
| 2383 void JavaThread::deoptimize() { | |
| 2384 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2385 StackFrameStream fst(this, UseBiasedLocking); | |
| 2386 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2387 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2388 // Iterate over all frames in the thread and deoptimize | |
| 2389 for(; !fst.is_done(); fst.next()) { | |
| 2390 if(fst.current()->can_be_deoptimized()) { | |
| 2391 | |
| 2392 if (only_at) { | |
| 2393 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2394 // consists of comma or carriage return separated numbers so | |
| 2395 // search for the current bci in that string. | |
| 2396 address pc = fst.current()->pc(); | |
| 2397 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2398 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2399 char buffer[8]; | |
| 2400 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2401 size_t len = strlen(buffer); | |
| 2402 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2403 while (found != NULL) { | |
| 2404 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2405 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2406 // Check that the bci found is bracketed by terminators. | |
| 2407 break; | |
| 2408 } | |
| 2409 found = strstr(found + 1, buffer); | |
| 2410 } | |
| 2411 if (!found) { | |
| 2412 continue; | |
| 2413 } | |
| 2414 } | |
| 2415 | |
| 2416 if (DebugDeoptimization && !deopt) { | |
| 2417 deopt = true; // One-time only print before deopt | |
| 2418 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2419 trace_frames(); | |
| 2420 trace_stack(); | |
| 2421 } | |
| 2422 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2423 } | |
| 2424 } | |
| 2425 | |
| 2426 if (DebugDeoptimization && deopt) { | |
| 2427 tty->print_cr("[AFTER Deoptimization]"); | |
| 2428 trace_frames(); | |
| 2429 } | |
| 2430 } | |
| 2431 | |
| 2432 | |
| 2433 // Make zombies | |
| 2434 void JavaThread::make_zombies() { | |
| 2435 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2436 if (fst.current()->can_be_deoptimized()) { | |
| 2437 // it is a Java nmethod | |
| 2438 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2439 nm->make_not_entrant(); | |
| 2440 } | |
| 2441 } | |
| 2442 } | |
| 2443 #endif // PRODUCT | |
| 2444 | |
| 2445 | |
| 2446 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2447 if (!has_last_Java_frame()) return; | |
| 2448 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2449 StackFrameStream fst(this, UseBiasedLocking); | |
| 2450 for(; !fst.is_done(); fst.next()) { | |
| 2451 if (fst.current()->should_be_deoptimized()) { | |
| 2452 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2453 } | |
| 2454 } | |
| 2455 } | |
| 2456 | |
| 2457 | |
| 2458 // GC support | |
| 2459 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2460 | |
| 2461 void JavaThread::gc_epilogue() { | |
| 2462 frames_do(frame_gc_epilogue); | |
| 2463 } | |
| 2464 | |
| 2465 | |
| 2466 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2467 | |
| 2468 void JavaThread::gc_prologue() { | |
| 2469 frames_do(frame_gc_prologue); | |
| 2470 } | |
| 2471 | |
|
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2472 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2473 // the given JavaThread in its _processed_thread field. |
|
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|
2474 class RememberProcessedThread: public StackObj { |
|
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|
2475 NamedThread* _cur_thr; |
|
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|
2476 public: |
|
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|
2477 RememberProcessedThread(JavaThread* jthr) { |
|
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|
2478 Thread* thread = Thread::current(); |
|
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|
2479 if (thread->is_Named_thread()) { |
|
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|
2480 _cur_thr = (NamedThread *)thread; |
|
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2481 _cur_thr->set_processed_thread(jthr); |
|
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|
2482 } else { |
|
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|
2483 _cur_thr = NULL; |
|
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|
2484 } |
|
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|
2485 } |
|
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|
2486 |
|
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|
2487 ~RememberProcessedThread() { |
|
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|
2488 if (_cur_thr) { |
|
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|
2489 _cur_thr->set_processed_thread(NULL); |
|
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|
2490 } |
|
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|
2491 } |
|
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|
2492 }; |
| 0 | 2493 |
|
989
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jrose
parents:
844
diff
changeset
|
2494 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2495 // Verify that the deferred card marks have been flushed. |
| 2496 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
1027
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parents:
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|
2497 |
| 0 | 2498 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2499 // since there may be more than one thread using each ThreadProfiler. | |
| 2500 | |
| 2501 // Traverse the GCHandles | |
|
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diff
changeset
|
2502 Thread::oops_do(f, cf); |
| 0 | 2503 |
| 2504 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2505 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2506 | |
| 2507 if (has_last_Java_frame()) { | |
|
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|
2508 // Record JavaThread to GC thread |
|
547f81740344
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|
2509 RememberProcessedThread rpt(this); |
| 0 | 2510 |
| 2511 // Traverse the privileged stack | |
| 2512 if (_privileged_stack_top != NULL) { | |
| 2513 _privileged_stack_top->oops_do(f); | |
| 2514 } | |
| 2515 | |
| 2516 // traverse the registered growable array | |
| 2517 if (_array_for_gc != NULL) { | |
| 2518 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2519 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2520 } | |
| 2521 } | |
| 2522 | |
| 2523 // Traverse the monitor chunks | |
| 2524 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2525 chunk->oops_do(f); | |
| 2526 } | |
| 2527 | |
| 2528 // Traverse the execution stack | |
| 2529 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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diff
changeset
|
2530 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2531 } |
| 2532 } | |
| 2533 | |
| 2534 // callee_target is never live across a gc point so NULL it here should | |
| 2535 // it still contain a methdOop. | |
| 2536 | |
| 2537 set_callee_target(NULL); | |
| 2538 | |
| 2539 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2540 // If we have deferred set_locals there might be oops waiting to be | |
| 2541 // written | |
| 2542 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2543 if (list != NULL) { | |
| 2544 for (int i = 0; i < list->length(); i++) { | |
| 2545 list->at(i)->oops_do(f); | |
| 2546 } | |
| 2547 } | |
| 2548 | |
| 2549 // Traverse instance variables at the end since the GC may be moving things | |
| 2550 // around using this function | |
| 2551 f->do_oop((oop*) &_threadObj); | |
| 2552 f->do_oop((oop*) &_vm_result); | |
| 2553 f->do_oop((oop*) &_vm_result_2); | |
|
3558
bc95d122df79
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Lukas Stadler <lukas.stadler@jku.at>
parents:
3555
diff
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|
2554 f->do_oop((oop*) &_graal_deopt_info); |
| 0 | 2555 f->do_oop((oop*) &_exception_oop); |
| 2556 f->do_oop((oop*) &_pending_async_exception); | |
| 2557 | |
| 2558 if (jvmti_thread_state() != NULL) { | |
| 2559 jvmti_thread_state()->oops_do(f); | |
| 2560 } | |
| 2561 } | |
| 2562 | |
|
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diff
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|
2563 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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|
2564 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2565 |
| 2566 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2567 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2568 | |
| 2569 if (has_last_Java_frame()) { | |
| 2570 // Traverse the execution stack | |
| 2571 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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diff
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|
2572 fst.current()->nmethods_do(cf); |
| 0 | 2573 } |
| 2574 } | |
| 2575 } | |
| 2576 | |
| 2577 // Printing | |
| 2578 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2579 switch (_thread_state) { | |
| 2580 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2581 case _thread_new: return "_thread_new"; | |
| 2582 case _thread_new_trans: return "_thread_new_trans"; | |
| 2583 case _thread_in_native: return "_thread_in_native"; | |
| 2584 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2585 case _thread_in_vm: return "_thread_in_vm"; | |
| 2586 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2587 case _thread_in_Java: return "_thread_in_Java"; | |
| 2588 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2589 case _thread_blocked: return "_thread_blocked"; | |
| 2590 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2591 default: return "unknown thread state"; | |
| 2592 } | |
| 2593 } | |
| 2594 | |
| 2595 #ifndef PRODUCT | |
| 2596 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2597 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2598 }; | |
| 2599 void JavaThread::print_thread_state() const { | |
| 2600 print_thread_state_on(tty); | |
| 2601 }; | |
| 2602 #endif // PRODUCT | |
| 2603 | |
| 2604 // Called by Threads::print() for VM_PrintThreads operation | |
| 2605 void JavaThread::print_on(outputStream *st) const { | |
| 2606 st->print("\"%s\" ", get_thread_name()); | |
| 2607 oop thread_oop = threadObj(); | |
| 2608 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2609 Thread::print_on(st); | |
| 2610 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
702
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parents:
669
diff
changeset
|
2611 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2612 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2613 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2614 } | |
| 2615 #ifndef PRODUCT | |
| 2616 print_thread_state_on(st); | |
| 2617 _safepoint_state->print_on(st); | |
| 2618 #endif // PRODUCT | |
| 2619 } | |
| 2620 | |
| 2621 // Called by fatal error handler. The difference between this and | |
| 2622 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2623 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2624 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2625 oop thread_obj = threadObj(); | |
| 2626 if (thread_obj != NULL) { | |
| 2627 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2628 } | |
| 2629 st->print(" ["); | |
| 2630 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2631 if (osthread()) { | |
| 2632 st->print(", id=%d", osthread()->thread_id()); | |
| 2633 } | |
| 2634 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2635 _stack_base - _stack_size, _stack_base); | |
| 2636 st->print("]"); | |
| 2637 return; | |
| 2638 } | |
| 2639 | |
| 2640 // Verification | |
| 2641 | |
| 2642 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2643 | |
| 2644 void JavaThread::verify() { | |
| 2645 // Verify oops in the thread. | |
|
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diff
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|
2646 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2647 |
| 2648 // Verify the stack frames. | |
| 2649 frames_do(frame_verify); | |
| 2650 } | |
| 2651 | |
| 2652 // CR 6300358 (sub-CR 2137150) | |
| 2653 // Most callers of this method assume that it can't return NULL but a | |
| 2654 // thread may not have a name whilst it is in the process of attaching to | |
| 2655 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2656 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2657 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2658 // for such that this method never returns NULL. | |
| 2659 const char* JavaThread::get_thread_name() const { | |
| 2660 #ifdef ASSERT | |
| 2661 // early safepoints can hit while current thread does not yet have TLS | |
| 2662 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2663 Thread *cur = Thread::current(); | |
| 2664 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2665 // Current JavaThreads are allowed to get their own name without | |
| 2666 // the Threads_lock. | |
| 2667 assert_locked_or_safepoint(Threads_lock); | |
| 2668 } | |
| 2669 } | |
| 2670 #endif // ASSERT | |
| 2671 return get_thread_name_string(); | |
| 2672 } | |
| 2673 | |
| 2674 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2675 // descriptive string if there is no set name | |
| 2676 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2677 const char* name_str; | |
| 2678 oop thread_obj = threadObj(); | |
| 2679 if (thread_obj != NULL) { | |
| 2680 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2681 if (name != NULL) { | |
| 2682 if (buf == NULL) { | |
| 2683 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2684 } | |
| 2685 else { | |
| 2686 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2687 } | |
| 2688 } | |
| 2689 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
| 2690 name_str = "<no-name - thread is attaching>"; | |
| 2691 } | |
| 2692 else { | |
| 2693 name_str = Thread::name(); | |
| 2694 } | |
| 2695 } | |
| 2696 else { | |
| 2697 name_str = Thread::name(); | |
| 2698 } | |
| 2699 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2700 return name_str; | |
| 2701 } | |
| 2702 | |
| 2703 | |
| 2704 const char* JavaThread::get_threadgroup_name() const { | |
| 2705 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2706 oop thread_obj = threadObj(); | |
| 2707 if (thread_obj != NULL) { | |
| 2708 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2709 if (thread_group != NULL) { | |
| 2710 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2711 // ThreadGroup.name can be null | |
| 2712 if (name != NULL) { | |
| 2713 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2714 return str; | |
| 2715 } | |
| 2716 } | |
| 2717 } | |
| 2718 return NULL; | |
| 2719 } | |
| 2720 | |
| 2721 const char* JavaThread::get_parent_name() const { | |
| 2722 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2723 oop thread_obj = threadObj(); | |
| 2724 if (thread_obj != NULL) { | |
| 2725 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2726 if (thread_group != NULL) { | |
| 2727 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2728 if (parent != NULL) { | |
| 2729 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2730 // ThreadGroup.name can be null | |
| 2731 if (name != NULL) { | |
| 2732 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2733 return str; | |
| 2734 } | |
| 2735 } | |
| 2736 } | |
| 2737 } | |
| 2738 return NULL; | |
| 2739 } | |
| 2740 | |
| 2741 ThreadPriority JavaThread::java_priority() const { | |
| 2742 oop thr_oop = threadObj(); | |
| 2743 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2744 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2745 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2746 return priority; | |
| 2747 } | |
| 2748 | |
| 2749 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2750 | |
| 2751 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2752 // Link Java Thread object <-> C++ Thread | |
| 2753 | |
| 2754 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2755 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2756 // be used to pass the C++ thread object to other methods. | |
| 2757 | |
| 2758 // Set the Java level thread object (jthread) field of the | |
| 2759 // new thread (a JavaThread *) to C++ thread object using the | |
| 2760 // "thread_oop" handle. | |
| 2761 | |
| 2762 // Set the thread field (a JavaThread *) of the | |
| 2763 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2764 | |
| 2765 Handle thread_oop(Thread::current(), | |
| 2766 JNIHandles::resolve_non_null(jni_thread)); | |
| 2767 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2768 "must be initialized"); | |
| 2769 set_threadObj(thread_oop()); | |
| 2770 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2771 | |
| 2772 if (prio == NoPriority) { | |
| 2773 prio = java_lang_Thread::priority(thread_oop()); | |
| 2774 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2775 } | |
| 2776 | |
| 2777 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2778 Thread::set_priority(this, prio); | |
| 2779 | |
| 2780 // Add the new thread to the Threads list and set it in motion. | |
| 2781 // We must have threads lock in order to call Threads::add. | |
| 2782 // It is crucial that we do not block before the thread is | |
| 2783 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2784 // will not be visited by GC. | |
| 2785 Threads::add(this); | |
| 2786 } | |
| 2787 | |
| 2788 oop JavaThread::current_park_blocker() { | |
| 2789 // Support for JSR-166 locks | |
| 2790 oop thread_oop = threadObj(); | |
| 242 | 2791 if (thread_oop != NULL && |
| 2792 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2793 return java_lang_Thread::park_blocker(thread_oop); |
| 2794 } | |
| 2795 return NULL; | |
| 2796 } | |
| 2797 | |
| 2798 | |
| 2799 void JavaThread::print_stack_on(outputStream* st) { | |
| 2800 if (!has_last_Java_frame()) return; | |
| 2801 ResourceMark rm; | |
| 2802 HandleMark hm; | |
| 2803 | |
| 2804 RegisterMap reg_map(this); | |
| 2805 vframe* start_vf = last_java_vframe(®_map); | |
| 2806 int count = 0; | |
| 2807 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2808 if (f->is_java_frame()) { | |
| 2809 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2810 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2811 | |
| 2812 // Print out lock information | |
| 2813 if (JavaMonitorsInStackTrace) { | |
| 2814 jvf->print_lock_info_on(st, count); | |
| 2815 } | |
| 2816 } else { | |
| 2817 // Ignore non-Java frames | |
| 2818 } | |
| 2819 | |
| 2820 // Bail-out case for too deep stacks | |
| 2821 count++; | |
| 2822 if (MaxJavaStackTraceDepth == count) return; | |
| 2823 } | |
| 2824 } | |
| 2825 | |
| 2826 | |
| 2827 // JVMTI PopFrame support | |
| 2828 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2829 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2830 if (in_bytes(size_in_bytes) != 0) { | |
| 2831 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2832 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
|
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|
2833 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2834 } |
| 2835 } | |
| 2836 | |
| 2837 void* JavaThread::popframe_preserved_args() { | |
| 2838 return _popframe_preserved_args; | |
| 2839 } | |
| 2840 | |
| 2841 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2842 return in_ByteSize(_popframe_preserved_args_size); | |
| 2843 } | |
| 2844 | |
| 2845 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2846 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2847 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2848 return in_WordSize(sz / wordSize); | |
| 2849 } | |
| 2850 | |
| 2851 void JavaThread::popframe_free_preserved_args() { | |
| 2852 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2853 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2854 _popframe_preserved_args = NULL; | |
| 2855 _popframe_preserved_args_size = 0; | |
| 2856 } | |
| 2857 | |
| 2858 #ifndef PRODUCT | |
| 2859 | |
| 2860 void JavaThread::trace_frames() { | |
| 2861 tty->print_cr("[Describe stack]"); | |
| 2862 int frame_no = 1; | |
| 2863 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2864 tty->print(" %d. ", frame_no++); | |
| 2865 fst.current()->print_value_on(tty,this); | |
| 2866 tty->cr(); | |
| 2867 } | |
| 2868 } | |
| 2869 | |
| 2870 | |
|
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|
2871 #ifdef ASSERT |
|
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|
2872 // Print or validate the layout of stack frames |
|
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|
2873 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
2874 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
2875 PRESERVE_EXCEPTION_MARK; |
|
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
2876 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
2877 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
2878 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
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|
2879 fst.current()->describe(values, ++frame_no); |
|
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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|
2880 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
2881 } |
|
2e038ad0c1d0
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|
2882 if (validate_only) { |
|
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|
2883 values.validate(); |
|
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|
2884 } else { |
|
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|
2885 tty->print_cr("[Describe stack layout]"); |
|
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|
2886 values.print(); |
|
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|
2887 } |
|
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|
2888 } |
|
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|
2889 #endif |
|
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|
2890 |
| 0 | 2891 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 2892 ResourceMark rm; | |
| 2893 int vframe_no = 1; | |
| 2894 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2895 if (f->is_java_frame()) { | |
| 2896 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 2897 } else { | |
| 2898 f->print(); | |
| 2899 } | |
| 2900 if (vframe_no > StackPrintLimit) { | |
| 2901 tty->print_cr("...<more frames>..."); | |
| 2902 return; | |
| 2903 } | |
| 2904 } | |
| 2905 } | |
| 2906 | |
| 2907 | |
| 2908 void JavaThread::trace_stack() { | |
| 2909 if (!has_last_Java_frame()) return; | |
| 2910 ResourceMark rm; | |
| 2911 HandleMark hm; | |
| 2912 RegisterMap reg_map(this); | |
| 2913 trace_stack_from(last_java_vframe(®_map)); | |
| 2914 } | |
| 2915 | |
| 2916 | |
| 2917 #endif // PRODUCT | |
| 2918 | |
| 2919 | |
| 2920 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 2921 assert(reg_map != NULL, "a map must be given"); | |
| 2922 frame f = last_frame(); | |
| 2923 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 2924 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 2925 } | |
| 2926 return NULL; | |
| 2927 } | |
| 2928 | |
| 2929 | |
| 2930 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 2931 vframeStream vfst(this); | |
| 2932 vfst.security_get_caller_frame(depth); | |
| 2933 if (!vfst.at_end()) { | |
| 2934 return vfst.method()->method_holder(); | |
| 2935 } | |
| 2936 return NULL; | |
| 2937 } | |
| 2938 | |
| 2939 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 2940 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
|
3650
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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3558
diff
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|
2941 //CompileBroker::compiler_thread_loop(); |
| 0 | 2942 } |
| 2943 | |
| 2944 // Create a CompilerThread | |
| 2945 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 2946 : JavaThread(&compiler_thread_entry) { | |
| 2947 _log = NULL; | |
| 2948 _task = NULL; | |
| 2949 _queue = queue; | |
| 2950 _counters = counters; | |
|
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|
2951 _scanned_nmethod = NULL; |
| 0 | 2952 |
| 2953 #ifndef PRODUCT | |
| 2954 _ideal_graph_printer = NULL; | |
| 2955 #endif | |
| 2956 } | |
| 2957 | |
|
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|
2958 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
|
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|
2959 JavaThread::oops_do(f, cf); |
|
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2960 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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3336
diff
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|
2961 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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3336
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|
2962 // process it here to make sure it isn't unloaded in the middle of |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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3336
diff
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|
2963 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2964 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
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3336
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|
2965 } |
|
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|
2966 } |
| 0 | 2967 |
| 2968 // ======= Threads ======== | |
| 2969 | |
| 2970 // The Threads class links together all active threads, and provides | |
| 2971 // operations over all threads. It is protected by its own Mutex | |
| 2972 // lock, which is also used in other contexts to protect thread | |
| 2973 // operations from having the thread being operated on from exiting | |
| 2974 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 2975 | |
| 2976 JavaThread* Threads::_thread_list = NULL; | |
| 2977 int Threads::_number_of_threads = 0; | |
| 2978 int Threads::_number_of_non_daemon_threads = 0; | |
| 2979 int Threads::_return_code = 0; | |
| 2980 size_t JavaThread::_stack_size_at_create = 0; | |
| 2981 | |
| 2982 // All JavaThreads | |
| 2983 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 2984 | |
| 2985 void os_stream(); | |
| 2986 | |
| 2987 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 2988 void Threads::threads_do(ThreadClosure* tc) { | |
| 2989 assert_locked_or_safepoint(Threads_lock); | |
| 2990 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 2991 ALL_JAVA_THREADS(p) { | |
| 2992 tc->do_thread(p); | |
| 2993 } | |
| 2994 // Someday we could have a table or list of all non-JavaThreads. | |
| 2995 // For now, just manually iterate through them. | |
| 2996 tc->do_thread(VMThread::vm_thread()); | |
| 2997 Universe::heap()->gc_threads_do(tc); | |
|
323
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|
2998 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
2999 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3000 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3001 // considering that WatchThread terminates when the VM is on the way to |
|
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|
3002 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3003 // way to prevent termination of WatcherThread would be to acquire |
|
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|
3004 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3005 // checking in some cases. |
|
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|
3006 if (wt != NULL) |
|
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|
3007 tc->do_thread(wt); |
|
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|
3008 |
| 0 | 3009 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3010 } | |
| 3011 | |
| 3012 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3013 | |
| 242 | 3014 extern void JDK_Version_init(); |
| 3015 | |
| 0 | 3016 // Check version |
| 3017 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3018 | |
| 3019 // Initialize the output stream module | |
| 3020 ostream_init(); | |
| 3021 | |
| 3022 // Process java launcher properties. | |
| 3023 Arguments::process_sun_java_launcher_properties(args); | |
| 3024 | |
| 3025 // Initialize the os module before using TLS | |
| 3026 os::init(); | |
| 3027 | |
| 3028 // Initialize system properties. | |
| 3029 Arguments::init_system_properties(); | |
| 3030 | |
| 242 | 3031 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3032 JDK_Version_init(); | |
| 3033 | |
|
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dfb38ea7da17
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diff
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|
3034 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
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1731
diff
changeset
|
3035 Arguments::init_version_specific_system_properties(); |
|
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1731
diff
changeset
|
3036 |
| 0 | 3037 // Parse arguments |
| 3038 jint parse_result = Arguments::parse(args); | |
| 3039 if (parse_result != JNI_OK) return parse_result; | |
| 3040 | |
| 3041 if (PauseAtStartup) { | |
| 3042 os::pause(); | |
| 3043 } | |
| 3044 | |
| 3045 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
| 3046 | |
| 3047 // Record VM creation timing statistics | |
| 3048 TraceVmCreationTime create_vm_timer; | |
| 3049 create_vm_timer.start(); | |
| 3050 | |
| 3051 // Timing (must come after argument parsing) | |
| 3052 TraceTime timer("Create VM", TraceStartupTime); | |
| 3053 | |
| 3054 // Initialize the os module after parsing the args | |
| 3055 jint os_init_2_result = os::init_2(); | |
| 3056 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3057 | |
| 3058 // Initialize output stream logging | |
| 3059 ostream_init_log(); | |
| 3060 | |
| 3061 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3062 // Must be before create_vm_init_agents() | |
| 3063 if (Arguments::init_libraries_at_startup()) { | |
| 3064 convert_vm_init_libraries_to_agents(); | |
| 3065 } | |
| 3066 | |
| 3067 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3068 if (Arguments::init_agents_at_startup()) { | |
| 3069 create_vm_init_agents(); | |
| 3070 } | |
| 3071 | |
| 3072 // Initialize Threads state | |
| 3073 _thread_list = NULL; | |
| 3074 _number_of_threads = 0; | |
| 3075 _number_of_non_daemon_threads = 0; | |
| 3076 | |
| 3077 // Initialize TLS | |
| 3078 ThreadLocalStorage::init(); | |
| 3079 | |
| 3080 // Initialize global data structures and create system classes in heap | |
| 3081 vm_init_globals(); | |
| 3082 | |
| 3083 // Attach the main thread to this os thread | |
| 3084 JavaThread* main_thread = new JavaThread(); | |
| 3085 main_thread->set_thread_state(_thread_in_vm); | |
| 3086 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3087 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3088 // change the stack size recorded here to one based on the java thread | |
| 3089 // stacksize. This adjusted size is what is used to figure the placement | |
| 3090 // of the guard pages. | |
| 3091 main_thread->record_stack_base_and_size(); | |
| 3092 main_thread->initialize_thread_local_storage(); | |
| 3093 | |
| 3094 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3095 | |
| 3096 if (!main_thread->set_as_starting_thread()) { | |
| 3097 vm_shutdown_during_initialization( | |
| 3098 "Failed necessary internal allocation. Out of swap space"); | |
| 3099 delete main_thread; | |
| 3100 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3101 return JNI_ENOMEM; | |
| 3102 } | |
| 3103 | |
| 3104 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3105 // crash Linux VM, see notes in os_linux.cpp. | |
| 3106 main_thread->create_stack_guard_pages(); | |
| 3107 | |
| 1878 | 3108 // Initialize Java-Level synchronization subsystem |
| 3109 ObjectMonitor::Initialize() ; | |
| 0 | 3110 |
| 3111 // Initialize global modules | |
| 3112 jint status = init_globals(); | |
| 3113 if (status != JNI_OK) { | |
| 3114 delete main_thread; | |
| 3115 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3116 return status; | |
| 3117 } | |
| 3118 | |
|
1681
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diff
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|
3119 // Should be done after the heap is fully created |
|
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|
3120 main_thread->cache_global_variables(); |
|
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|
3121 |
| 0 | 3122 HandleMark hm; |
| 3123 | |
| 3124 { MutexLocker mu(Threads_lock); | |
| 3125 Threads::add(main_thread); | |
| 3126 } | |
| 3127 | |
| 3128 // Any JVMTI raw monitors entered in onload will transition into | |
| 3129 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3130 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3131 | |
| 3132 if (VerifyBeforeGC && | |
| 3133 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3134 Universe::heap()->prepare_for_verify(); | |
| 3135 Universe::verify(); // make sure we're starting with a clean slate | |
| 3136 } | |
| 3137 | |
| 3138 // Create the VMThread | |
| 3139 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3140 VMThread::create(); | |
| 3141 Thread* vmthread = VMThread::vm_thread(); | |
| 3142 | |
| 3143 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3144 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3145 | |
| 3146 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3147 // Monitors can have spurious returns, must always check another state flag | |
| 3148 { | |
| 3149 MutexLocker ml(Notify_lock); | |
| 3150 os::start_thread(vmthread); | |
| 3151 while (vmthread->active_handles() == NULL) { | |
| 3152 Notify_lock->wait(); | |
| 3153 } | |
| 3154 } | |
| 3155 } | |
| 3156 | |
| 3157 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3158 EXCEPTION_MARK; | |
| 3159 | |
| 3160 // At this point, the Universe is initialized, but we have not executed | |
| 3161 // any byte code. Now is a good time (the only time) to dump out the | |
| 3162 // internal state of the JVM for sharing. | |
| 3163 | |
| 3164 if (DumpSharedSpaces) { | |
| 3165 Universe::heap()->preload_and_dump(CHECK_0); | |
| 3166 ShouldNotReachHere(); | |
| 3167 } | |
| 3168 | |
| 3169 // Always call even when there are not JVMTI environments yet, since environments | |
| 3170 // may be attached late and JVMTI must track phases of VM execution | |
| 3171 JvmtiExport::enter_start_phase(); | |
| 3172 | |
| 3173 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3174 JvmtiExport::post_vm_start(); | |
| 3175 | |
| 3176 { | |
| 3177 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3178 | |
| 3179 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3180 create_vm_init_libraries(); | |
| 3181 } | |
| 3182 | |
| 3183 if (InitializeJavaLangString) { | |
|
2177
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3184 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3185 } else { |
| 3186 warning("java.lang.String not initialized"); | |
| 3187 } | |
| 3188 | |
|
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3189 if (AggressiveOpts) { |
|
192
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3190 { |
|
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3191 // Forcibly initialize java/util/HashMap and mutate the private |
|
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3192 // static final "frontCacheEnabled" field before we start creating instances |
|
18
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|
3193 #ifdef ASSERT |
|
2177
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3194 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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3195 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
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|
3196 #endif |
|
2177
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3197 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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3198 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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3199 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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3200 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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3201 ik->initialize(CHECK_0); |
|
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|
3202 fieldDescriptor fd; |
|
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|
3203 // Possible we might not find this field; if so, don't break |
|
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|
3204 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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3205 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
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|
3206 } |
|
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|
3207 } |
|
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|
3208 |
|
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|
3209 if (UseStringCache) { |
|
669
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|
3210 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
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3211 // static final "stringCacheEnabled" field before we start creating instances |
|
2177
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|
3212 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
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|
3213 // Possible that StringValue isn't present: if so, silently don't break |
|
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|
3214 if (k_o != NULL) { |
|
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|
3215 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3216 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3217 ik->initialize(CHECK_0); |
|
eca19a8425b5
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|
3218 fieldDescriptor fd; |
|
eca19a8425b5
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|
3219 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
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|
3220 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
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|
3221 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
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|
3222 } |
|
192
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|
3223 } |
|
18
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|
3224 } |
|
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|
3225 } |
|
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|
3226 |
| 0 | 3227 // Initialize java_lang.System (needed before creating the thread) |
| 3228 if (InitializeJavaLangSystem) { | |
|
2177
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|
3229 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
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|
3230 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3231 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3232 Universe::set_main_thread_group(thread_group()); | |
|
2177
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|
3233 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3234 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3235 main_thread->set_threadObj(thread_object); | |
| 3236 // Set thread status to running since main thread has | |
| 3237 // been started and running. | |
| 3238 java_lang_Thread::set_thread_status(thread_object, | |
| 3239 java_lang_Thread::RUNNABLE); | |
| 3240 | |
| 3241 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
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|
3242 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
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coleenp
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|
3243 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3244 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
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|
3245 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3246 call_initializeSystemClass(CHECK_0); |
| 3247 } else { | |
| 3248 warning("java.lang.System not initialized"); | |
| 3249 } | |
| 3250 | |
| 3251 // an instance of OutOfMemory exception has been allocated earlier | |
| 3252 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
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|
3253 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
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coleenp
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|
3254 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
3255 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
3256 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
3257 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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|
3258 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
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|
3259 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
| 0 | 3260 } else { |
| 3261 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3262 warning("java.lang.NullPointerException has not been initialized"); | |
| 3263 warning("java.lang.ClassCastException has not been initialized"); | |
| 3264 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3265 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3266 warning("java.lang.StackOverflowError has not been initialized"); | |
| 3267 } | |
|
2416
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diff
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|
3268 } |
| 0 | 3269 |
| 3270 // See : bugid 4211085. | |
| 3271 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3272 // property"java.compiler" and read & write property "java.vm.info". | |
| 3273 // When a security manager is installed through the command line | |
| 3274 // option "-Djava.security.manager", the above properties are not | |
| 3275 // readable and the static initializer for java.lang.Compiler fails | |
| 3276 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3277 // user code which calls methods in java.lang.Compiler. | |
| 3278 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3279 // system domains are on the stack when the properties are read. | |
| 3280 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3281 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3282 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3283 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3284 // Once that is done, we should remove this hack. | |
|
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|
3285 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3286 |
| 3287 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3288 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3289 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3290 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3291 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3292 reset_vm_info_property(CHECK_0); | |
| 3293 | |
| 3294 quicken_jni_functions(); | |
| 3295 | |
| 3296 // Set flag that basic initialization has completed. Used by exceptions and various | |
| 3297 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3298 set_init_completed(); | |
| 3299 | |
| 3300 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
| 3301 | |
| 3302 // record VM initialization completion time | |
| 3303 Management::record_vm_init_completed(); | |
| 3304 | |
| 3305 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3306 // valid exceptions may be thrown in the process. | |
| 3307 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3308 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3309 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3310 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3311 if (HAS_PENDING_EXCEPTION) { | |
| 3312 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3313 } | |
| 3314 | |
| 3315 #ifndef SERIALGC | |
| 3316 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
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|
3317 // and better encapsulated. The ugly nested if test would go away |
|
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|
3318 // once things are properly refactored. XXX YSR |
|
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|
3319 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
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|
3320 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
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|
3321 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
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|
3322 } else { |
|
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|
3323 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
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|
3324 } |
| 0 | 3325 if (HAS_PENDING_EXCEPTION) { |
| 3326 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3327 } | |
| 3328 } | |
| 3329 #endif // SERIALGC | |
| 3330 | |
| 3331 // Always call even when there are not JVMTI environments yet, since environments | |
| 3332 // may be attached late and JVMTI must track phases of VM execution | |
| 3333 JvmtiExport::enter_live_phase(); | |
| 3334 | |
| 3335 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3336 os::signal_init(); | |
| 3337 | |
| 3338 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3339 if (!DisableAttachMechanism) { | |
| 3340 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3341 AttachListener::init(); | |
| 3342 } | |
| 3343 } | |
| 3344 | |
| 3345 // Launch -Xrun agents | |
| 3346 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3347 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3348 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3349 create_vm_init_libraries(); | |
| 3350 } | |
| 3351 | |
| 3352 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
| 3353 JvmtiExport::post_vm_initialized(); | |
| 3354 | |
| 3355 Chunk::start_chunk_pool_cleaner_task(); | |
| 3356 | |
| 3357 // initialize compiler(s) | |
| 3358 CompileBroker::compilation_init(); | |
| 3359 | |
| 3360 Management::initialize(THREAD); | |
| 3361 if (HAS_PENDING_EXCEPTION) { | |
| 3362 // management agent fails to start possibly due to | |
| 3363 // configuration problem and is responsible for printing | |
| 3364 // stack trace if appropriate. Simply exit VM. | |
| 3365 vm_exit(1); | |
| 3366 } | |
| 3367 | |
| 3368 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3369 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3370 if (MemProfiling) MemProfiler::engage(); | |
| 3371 StatSampler::engage(); | |
| 3372 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3373 | |
| 3374 BiasedLocking::init(); | |
| 3375 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3376 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3377 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3378 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3379 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3380 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3381 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3382 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
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|
3383 } |
| 0 | 3384 |
| 3385 // Start up the WatcherThread if there are any periodic tasks | |
| 3386 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3387 // aren't, late joiners might appear to start slowly (we might | |
| 3388 // take a while to process their first tick). | |
| 3389 if (PeriodicTask::num_tasks() > 0) { | |
| 3390 WatcherThread::start(); | |
| 3391 } | |
| 3392 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3393 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3394 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3395 |
| 0 | 3396 create_vm_timer.end(); |
| 3397 return JNI_OK; | |
| 3398 } | |
| 3399 | |
| 3400 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3401 extern "C" { | |
| 3402 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3403 } | |
| 3404 // Find a command line agent library and return its entry point for | |
| 3405 // -agentlib: -agentpath: -Xrun | |
| 3406 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3407 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3408 OnLoadEntry_t on_load_entry = NULL; | |
| 3409 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3410 | |
| 3411 if (library == NULL) { | |
| 3412 char buffer[JVM_MAXPATHLEN]; | |
| 3413 char ebuf[1024]; | |
| 3414 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
|
3415 const char *msg = "Could not find agent library "; |
| 0 | 3416 |
| 3417 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
3418 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3419 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3420 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
|
3421 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
|
3422 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
|
3423 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3424 // 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
|
3425 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
|
3426 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3427 } |
| 3428 } else { | |
| 3429 // 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
|
3430 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
|
3431 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3432 #ifdef KERNEL |
| 3433 // Download instrument dll | |
| 3434 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3435 char *props = Arguments::get_kernel_properties(); | |
| 3436 char *home = Arguments::get_java_home(); | |
| 3437 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3438 " 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
|
3439 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
|
3440 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
| 0 | 3441 jio_snprintf(cmd, length, fmt, home, props); |
| 3442 int status = os::fork_and_exec(cmd); | |
| 3443 FreeHeap(props); | |
| 3444 if (status == -1) { | |
| 3445 warning(cmd); | |
| 3446 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3447 strerror(errno)); | |
| 3448 } | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3449 FREE_C_HEAP_ARRAY(char, cmd); |
| 0 | 3450 // 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
|
3451 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3452 } |
| 3453 #endif // KERNEL | |
| 3454 if (library == NULL) { // Try the local directory | |
| 3455 char ns[1] = {0}; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3456 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
|
3457 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3458 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3459 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
|
3460 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
|
3461 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
|
3462 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3463 // 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
|
3464 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
|
3465 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3466 } |
| 3467 } | |
| 3468 } | |
| 3469 agent->set_os_lib(library); | |
| 3470 } | |
| 3471 | |
| 3472 // Find the OnLoad function. | |
| 3473 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
|
3474 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3475 if (on_load_entry != NULL) break; |
| 3476 } | |
| 3477 return on_load_entry; | |
| 3478 } | |
| 3479 | |
| 3480 // Find the JVM_OnLoad entry point | |
| 3481 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3482 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3483 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3484 } | |
| 3485 | |
| 3486 // Find the Agent_OnLoad entry point | |
| 3487 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3488 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3489 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3490 } | |
| 3491 | |
| 3492 // For backwards compatibility with -Xrun | |
| 3493 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3494 // treated like -agentpath: | |
| 3495 // Must be called before agent libraries are created | |
| 3496 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3497 AgentLibrary* agent; | |
| 3498 AgentLibrary* next; | |
| 3499 | |
| 3500 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3501 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3502 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3503 | |
| 3504 // If there is an JVM_OnLoad function it will get called later, | |
| 3505 // otherwise see if there is an Agent_OnLoad | |
| 3506 if (on_load_entry == NULL) { | |
| 3507 on_load_entry = lookup_agent_on_load(agent); | |
| 3508 if (on_load_entry != NULL) { | |
| 3509 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3510 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3511 Arguments::convert_library_to_agent(agent); | |
| 3512 } else { | |
| 3513 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3514 } | |
| 3515 } | |
| 3516 } | |
| 3517 } | |
| 3518 | |
| 3519 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3520 // Invokes Agent_OnLoad | |
| 3521 // Called very early -- before JavaThreads exist | |
| 3522 void Threads::create_vm_init_agents() { | |
| 3523 extern struct JavaVM_ main_vm; | |
| 3524 AgentLibrary* agent; | |
| 3525 | |
| 3526 JvmtiExport::enter_onload_phase(); | |
| 3527 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3528 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3529 | |
| 3530 if (on_load_entry != NULL) { | |
| 3531 // Invoke the Agent_OnLoad function | |
| 3532 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3533 if (err != JNI_OK) { | |
| 3534 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3535 } | |
| 3536 } else { | |
| 3537 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3538 } | |
| 3539 } | |
| 3540 JvmtiExport::enter_primordial_phase(); | |
| 3541 } | |
| 3542 | |
| 3543 extern "C" { | |
| 3544 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3545 } | |
| 3546 | |
| 3547 void Threads::shutdown_vm_agents() { | |
| 3548 // Send any Agent_OnUnload notifications | |
| 3549 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3550 extern struct JavaVM_ main_vm; | |
| 3551 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3552 | |
| 3553 // Find the Agent_OnUnload function. | |
| 3554 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3555 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
|
3556 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3557 |
| 3558 // Invoke the Agent_OnUnload function | |
| 3559 if (unload_entry != NULL) { | |
| 3560 JavaThread* thread = JavaThread::current(); | |
| 3561 ThreadToNativeFromVM ttn(thread); | |
| 3562 HandleMark hm(thread); | |
| 3563 (*unload_entry)(&main_vm); | |
| 3564 break; | |
| 3565 } | |
| 3566 } | |
| 3567 } | |
| 3568 } | |
| 3569 | |
| 3570 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3571 // Invokes JVM_OnLoad | |
| 3572 void Threads::create_vm_init_libraries() { | |
| 3573 extern struct JavaVM_ main_vm; | |
| 3574 AgentLibrary* agent; | |
| 3575 | |
| 3576 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3577 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3578 | |
| 3579 if (on_load_entry != NULL) { | |
| 3580 // Invoke the JVM_OnLoad function | |
| 3581 JavaThread* thread = JavaThread::current(); | |
| 3582 ThreadToNativeFromVM ttn(thread); | |
| 3583 HandleMark hm(thread); | |
| 3584 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3585 if (err != JNI_OK) { | |
| 3586 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3587 } | |
| 3588 } else { | |
| 3589 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3590 } | |
| 3591 } | |
| 3592 } | |
| 3593 | |
| 3594 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3595 void JavaThread::invoke_shutdown_hooks() { | |
| 3596 HandleMark hm(this); | |
| 3597 | |
| 3598 // We could get here with a pending exception, if so clear it now. | |
| 3599 if (this->has_pending_exception()) { | |
| 3600 this->clear_pending_exception(); | |
| 3601 } | |
| 3602 | |
| 3603 EXCEPTION_MARK; | |
| 3604 klassOop k = | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3605 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3606 THREAD); |
| 3607 if (k != NULL) { | |
| 3608 // SystemDictionary::resolve_or_null will return null if there was | |
| 3609 // an exception. If we cannot load the Shutdown class, just don't | |
| 3610 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3611 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3612 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3613 // was called, the Shutdown class would have already been loaded | |
| 3614 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3615 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3616 JavaValue result(T_VOID); | |
| 3617 JavaCalls::call_static(&result, | |
| 3618 shutdown_klass, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3619 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3620 vmSymbols::void_method_signature(), |
| 0 | 3621 THREAD); |
| 3622 } | |
| 3623 CLEAR_PENDING_EXCEPTION; | |
| 3624 } | |
| 3625 | |
| 3626 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3627 // the program falls off the end of main(). Another VM exit path is through | |
| 3628 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3629 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3630 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3631 // and VM_Exit op at VM level. | |
| 3632 // | |
| 3633 // Shutdown sequence: | |
| 3634 // + Wait until we are the last non-daemon thread to execute | |
| 3635 // <-- every thing is still working at this moment --> | |
| 3636 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3637 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3638 // + Call before_exit(), prepare for VM exit | |
| 3639 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3640 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3641 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3642 // post thread end and vm death events to JVMTI, | |
| 3643 // stop signal thread | |
| 3644 // + Call JavaThread::exit(), it will: | |
| 3645 // > release JNI handle blocks, remove stack guard pages | |
| 3646 // > remove this thread from Threads list | |
| 3647 // <-- no more Java code from this thread after this point --> | |
| 3648 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3649 // the compiler threads at safepoint | |
| 3650 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3651 // + Disable tracing at JNI/JVM barriers | |
| 3652 // + Set _vm_exited flag for threads that are still running native code | |
| 3653 // + Delete this thread | |
| 3654 // + Call exit_globals() | |
| 3655 // > deletes tty | |
| 3656 // > deletes PerfMemory resources | |
| 3657 // + Return to caller | |
| 3658 | |
| 3659 bool Threads::destroy_vm() { | |
| 3660 JavaThread* thread = JavaThread::current(); | |
| 3661 | |
| 3662 // Wait until we are the last non-daemon thread to execute | |
| 3663 { MutexLocker nu(Threads_lock); | |
| 3664 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3665 // This wait should make safepoint checks, wait without a timeout, | |
| 3666 // and wait as a suspend-equivalent condition. | |
| 3667 // | |
| 3668 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3669 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3670 // is waiting for the external suspend request on this thread to | |
| 3671 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3672 // timeout, but that takes time. Making this wait a suspend- | |
| 3673 // equivalent condition solves that timeout problem. | |
| 3674 // | |
| 3675 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3676 Mutex::_as_suspend_equivalent_flag); | |
| 3677 } | |
| 3678 | |
| 3679 // Hang forever on exit if we are reporting an error. | |
| 3680 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3681 os::infinite_sleep(); | |
| 3682 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2203
diff
changeset
|
3683 os::wait_for_keypress_at_exit(); |
| 0 | 3684 |
| 3685 if (JDK_Version::is_jdk12x_version()) { | |
| 3686 // We are the last thread running, so check if finalizers should be run. | |
| 3687 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3688 HandleMark rm(thread); | |
| 3689 Universe::run_finalizers_on_exit(); | |
| 3690 } else { | |
| 3691 // run Java level shutdown hooks | |
| 3692 thread->invoke_shutdown_hooks(); | |
| 3693 } | |
| 3694 | |
| 3695 before_exit(thread); | |
| 3696 | |
| 3697 thread->exit(true); | |
| 3698 | |
| 3699 // Stop VM thread. | |
| 3700 { | |
| 3701 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3702 // GC vm_operations can get caught at the safepoint, and the | |
| 3703 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3704 // to prevent this. The GC vm_operations will not be able to | |
| 3705 // queue until after the vm thread is dead. | |
| 3706 MutexLocker ml(Heap_lock); | |
| 3707 | |
| 3708 VMThread::wait_for_vm_thread_exit(); | |
| 3709 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3710 VMThread::destroy(); | |
| 3711 } | |
| 3712 | |
| 3713 // clean up ideal graph printers | |
| 3714 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3715 IdealGraphPrinter::clean_up(); | |
| 3716 #endif | |
| 3717 | |
| 3718 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3719 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3720 // daemon threads executing native code are still running. But they | |
| 3721 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3722 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3723 | |
| 3724 #ifndef PRODUCT | |
| 3725 // disable function tracing at JNI/JVM barriers | |
| 3726 TraceJNICalls = false; | |
| 3727 TraceJVMCalls = false; | |
| 3728 TraceRuntimeCalls = false; | |
| 3729 #endif | |
| 3730 | |
| 3731 VM_Exit::set_vm_exited(); | |
| 3732 | |
| 3733 notify_vm_shutdown(); | |
| 3734 | |
| 3735 delete thread; | |
| 3736 | |
| 3737 // exit_globals() will delete tty | |
| 3738 exit_globals(); | |
| 3739 | |
| 3740 return true; | |
| 3741 } | |
| 3742 | |
| 3743 | |
| 3744 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3745 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3746 return is_supported_jni_version(version); | |
| 3747 } | |
| 3748 | |
| 3749 | |
| 3750 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3751 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3752 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3753 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3754 return JNI_FALSE; | |
| 3755 } | |
| 3756 | |
| 3757 | |
| 3758 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3759 // The threads lock must be owned at this point | |
| 3760 assert_locked_or_safepoint(Threads_lock); | |
|
1842
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diff
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|
3761 |
|
6e0aac35bfa9
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diff
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|
3762 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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diff
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|
3763 // why it is called here. |
|
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1838
diff
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|
3764 p->initialize_queues(); |
| 0 | 3765 p->set_next(_thread_list); |
| 3766 _thread_list = p; | |
| 3767 _number_of_threads++; | |
| 3768 oop threadObj = p->threadObj(); | |
| 3769 bool daemon = true; | |
| 3770 // Bootstrapping problem: threadObj can be null for initial | |
| 3771 // JavaThread (or for threads attached via JNI) | |
| 3772 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3773 _number_of_non_daemon_threads++; | |
| 3774 daemon = false; | |
| 3775 } | |
| 3776 | |
| 3777 ThreadService::add_thread(p, daemon); | |
| 3778 | |
| 3779 // Possible GC point. | |
| 3780 Events::log("Thread added: " INTPTR_FORMAT, p); | |
| 3781 } | |
| 3782 | |
| 3783 void Threads::remove(JavaThread* p) { | |
| 3784 // Extra scope needed for Thread_lock, so we can check | |
| 3785 // that we do not remove thread without safepoint code notice | |
| 3786 { MutexLocker ml(Threads_lock); | |
| 3787 | |
| 3788 assert(includes(p), "p must be present"); | |
| 3789 | |
| 3790 JavaThread* current = _thread_list; | |
| 3791 JavaThread* prev = NULL; | |
| 3792 | |
| 3793 while (current != p) { | |
| 3794 prev = current; | |
| 3795 current = current->next(); | |
| 3796 } | |
| 3797 | |
| 3798 if (prev) { | |
| 3799 prev->set_next(current->next()); | |
| 3800 } else { | |
| 3801 _thread_list = p->next(); | |
| 3802 } | |
| 3803 _number_of_threads--; | |
| 3804 oop threadObj = p->threadObj(); | |
| 3805 bool daemon = true; | |
| 3806 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3807 _number_of_non_daemon_threads--; | |
| 3808 daemon = false; | |
| 3809 | |
| 3810 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3811 // on destroy_vm will wake up. | |
| 3812 if (number_of_non_daemon_threads() == 1) | |
| 3813 Threads_lock->notify_all(); | |
| 3814 } | |
| 3815 ThreadService::remove_thread(p, daemon); | |
| 3816 | |
| 3817 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3818 // the thread might mess around with locks after this point. This can cause it | |
| 3819 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3820 // of this thread since it is removed from the queue. | |
| 3821 p->set_terminated_value(); | |
| 3822 } // unlock Threads_lock | |
| 3823 | |
| 3824 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
| 3825 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
| 3826 } | |
| 3827 | |
| 3828 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3829 bool Threads::includes(JavaThread* p) { | |
| 3830 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3831 ALL_JAVA_THREADS(q) { | |
| 3832 if (q == p ) { | |
| 3833 return true; | |
| 3834 } | |
| 3835 } | |
| 3836 return false; | |
| 3837 } | |
| 3838 | |
| 3839 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3840 // but the garbage collector must provide a safe context for them to run. | |
| 3841 // In particular, these things should never be called when the Threads_lock | |
| 3842 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3843 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3844 // all threads gets blocked when exiting or starting). | |
| 3845 | |
|
989
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parents:
844
diff
changeset
|
3846 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3847 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3848 p->oops_do(f, cf); |
| 0 | 3849 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3850 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3851 } |
| 3852 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3853 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3854 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3855 // root groups. Overhead should be small enough to use all the time, | |
| 3856 // even in sequential code. | |
| 3857 SharedHeap* sh = SharedHeap::heap(); | |
| 3858 bool is_par = (sh->n_par_threads() > 0); | |
| 3859 int cp = SharedHeap::heap()->strong_roots_parity(); | |
| 3860 ALL_JAVA_THREADS(p) { | |
| 3861 if (p->claim_oops_do(is_par, cp)) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3862 p->oops_do(f, cf); |
| 0 | 3863 } |
| 3864 } | |
| 3865 VMThread* vmt = VMThread::vm_thread(); | |
| 3866 if (vmt->claim_oops_do(is_par, cp)) | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3867 vmt->oops_do(f, cf); |
| 0 | 3868 } |
| 3869 | |
| 3870 #ifndef SERIALGC | |
| 3871 // Used by ParallelScavenge | |
| 3872 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 3873 ALL_JAVA_THREADS(p) { | |
| 3874 q->enqueue(new ThreadRootsTask(p)); | |
| 3875 } | |
| 3876 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 3877 } | |
| 3878 | |
| 3879 // Used by Parallel Old | |
| 3880 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 3881 ALL_JAVA_THREADS(p) { | |
| 3882 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 3883 } | |
| 3884 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 3885 } | |
| 3886 #endif // SERIALGC | |
| 3887 | |
|
989
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jrose
parents:
844
diff
changeset
|
3888 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 3889 ALL_JAVA_THREADS(p) { |
|
989
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jrose
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844
diff
changeset
|
3890 p->nmethods_do(cf); |
| 0 | 3891 } |
|
989
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jrose
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844
diff
changeset
|
3892 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 3893 } |
| 3894 | |
| 3895 void Threads::gc_epilogue() { | |
| 3896 ALL_JAVA_THREADS(p) { | |
| 3897 p->gc_epilogue(); | |
| 3898 } | |
| 3899 } | |
| 3900 | |
| 3901 void Threads::gc_prologue() { | |
| 3902 ALL_JAVA_THREADS(p) { | |
| 3903 p->gc_prologue(); | |
| 3904 } | |
| 3905 } | |
| 3906 | |
| 3907 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 3908 ALL_JAVA_THREADS(p) { | |
| 3909 p->deoptimized_wrt_marked_nmethods(); | |
| 3910 } | |
| 3911 } | |
| 3912 | |
| 3913 | |
| 3914 // Get count Java threads that are waiting to enter the specified monitor. | |
| 3915 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 3916 address monitor, bool doLock) { | |
| 3917 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 3918 "must grab Threads_lock or be at safepoint"); | |
| 3919 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 3920 | |
| 3921 int i = 0; | |
| 3922 { | |
| 3923 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3924 ALL_JAVA_THREADS(p) { | |
|
1410
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Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
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1320
diff
changeset
|
3925 |
|
b30a2cd5e3a2
Added methods to c1x_VMExits.cpp
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parents:
1320
diff
changeset
|
3926 // (tw) May we do this? |
|
b30a2cd5e3a2
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Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
parents:
1320
diff
changeset
|
3927 //if (p->is_Compiler_thread()) continue; |
| 0 | 3928 |
| 3929 address pending = (address)p->current_pending_monitor(); | |
| 3930 if (pending == monitor) { // found a match | |
| 3931 if (i < count) result->append(p); // save the first count matches | |
| 3932 i++; | |
| 3933 } | |
| 3934 } | |
| 3935 } | |
| 3936 return result; | |
| 3937 } | |
| 3938 | |
| 3939 | |
| 3940 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 3941 assert(doLock || | |
| 3942 Threads_lock->owned_by_self() || | |
| 3943 SafepointSynchronize::is_at_safepoint(), | |
| 3944 "must grab Threads_lock or be at safepoint"); | |
| 3945 | |
| 3946 // NULL owner means not locked so we can skip the search | |
| 3947 if (owner == NULL) return NULL; | |
| 3948 | |
| 3949 { | |
| 3950 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3951 ALL_JAVA_THREADS(p) { | |
| 3952 // first, see if owner is the address of a Java thread | |
| 3953 if (owner == (address)p) return p; | |
| 3954 } | |
| 3955 } | |
| 3956 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 3957 if (UseHeavyMonitors) return NULL; | |
| 3958 | |
| 3959 // | |
| 3960 // If we didn't find a matching Java thread and we didn't force use of | |
| 3961 // heavyweight monitors, then the owner is the stack address of the | |
| 3962 // Lock Word in the owning Java thread's stack. | |
| 3963 // | |
| 3964 JavaThread* the_owner = NULL; | |
| 3965 { | |
| 3966 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3967 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
3968 if (q->is_lock_owned(owner)) { |
| 0 | 3969 the_owner = q; |
|
702
b9fba36710f2
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xlu
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669
diff
changeset
|
3970 break; |
| 0 | 3971 } |
| 3972 } | |
| 3973 } | |
| 3974 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 3975 return the_owner; | |
| 3976 } | |
| 3977 | |
| 3978 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 3979 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 3980 char buf[32]; | |
| 3981 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 3982 | |
| 3983 st->print_cr("Full thread dump %s (%s %s):", | |
| 3984 Abstract_VM_Version::vm_name(), | |
| 3985 Abstract_VM_Version::vm_release(), | |
| 3986 Abstract_VM_Version::vm_info_string() | |
| 3987 ); | |
| 3988 st->cr(); | |
| 3989 | |
| 3990 #ifndef SERIALGC | |
| 3991 // Dump concurrent locks | |
| 3992 ConcurrentLocksDump concurrent_locks; | |
| 3993 if (print_concurrent_locks) { | |
| 3994 concurrent_locks.dump_at_safepoint(); | |
| 3995 } | |
| 3996 #endif // SERIALGC | |
| 3997 | |
| 3998 ALL_JAVA_THREADS(p) { | |
| 3999 ResourceMark rm; | |
| 4000 p->print_on(st); | |
| 4001 if (print_stacks) { | |
| 4002 if (internal_format) { | |
| 4003 p->trace_stack(); | |
| 4004 } else { | |
| 4005 p->print_stack_on(st); | |
| 4006 } | |
| 4007 } | |
| 4008 st->cr(); | |
| 4009 #ifndef SERIALGC | |
| 4010 if (print_concurrent_locks) { | |
| 4011 concurrent_locks.print_locks_on(p, st); | |
| 4012 } | |
| 4013 #endif // SERIALGC | |
| 4014 } | |
| 4015 | |
| 4016 VMThread::vm_thread()->print_on(st); | |
| 4017 st->cr(); | |
| 4018 Universe::heap()->print_gc_threads_on(st); | |
| 4019 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4020 if (wt != NULL) wt->print_on(st); | |
| 4021 st->cr(); | |
| 4022 CompileBroker::print_compiler_threads_on(st); | |
| 4023 st->flush(); | |
| 4024 } | |
| 4025 | |
| 4026 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4027 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4028 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4029 // memory (even in resource area), it might deadlock the error handler. | |
| 4030 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4031 bool found_current = false; | |
| 4032 st->print_cr("Java Threads: ( => current thread )"); | |
| 4033 ALL_JAVA_THREADS(thread) { | |
| 4034 bool is_current = (current == thread); | |
| 4035 found_current = found_current || is_current; | |
| 4036 | |
| 4037 st->print("%s", is_current ? "=>" : " "); | |
| 4038 | |
| 4039 st->print(PTR_FORMAT, thread); | |
| 4040 st->print(" "); | |
| 4041 thread->print_on_error(st, buf, buflen); | |
| 4042 st->cr(); | |
| 4043 } | |
| 4044 st->cr(); | |
| 4045 | |
| 4046 st->print_cr("Other Threads:"); | |
| 4047 if (VMThread::vm_thread()) { | |
| 4048 bool is_current = (current == VMThread::vm_thread()); | |
| 4049 found_current = found_current || is_current; | |
| 4050 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4051 | |
| 4052 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4053 st->print(" "); | |
| 4054 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4055 st->cr(); | |
| 4056 } | |
| 4057 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4058 if (wt != NULL) { | |
| 4059 bool is_current = (current == wt); | |
| 4060 found_current = found_current || is_current; | |
| 4061 st->print("%s", is_current ? "=>" : " "); | |
| 4062 | |
| 4063 st->print(PTR_FORMAT, wt); | |
| 4064 st->print(" "); | |
| 4065 wt->print_on_error(st, buf, buflen); | |
| 4066 st->cr(); | |
| 4067 } | |
| 4068 if (!found_current) { | |
| 4069 st->cr(); | |
| 4070 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4071 current->print_on_error(st, buf, buflen); | |
| 4072 st->cr(); | |
| 4073 } | |
| 4074 } | |
| 4075 | |
| 1878 | 4076 // Internal SpinLock and Mutex |
| 4077 // Based on ParkEvent | |
| 4078 | |
| 4079 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4080 // |
| 1878 | 4081 // We employ SpinLocks _only for low-contention, fixed-length |
| 4082 // short-duration critical sections where we're concerned | |
| 4083 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4084 // The mux construct provides a spin-then-block mutual exclusion | |
| 4085 // mechanism. | |
| 4086 // | |
| 4087 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4088 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4089 // for the JVM to devolve to yielding with little progress. This is true | |
| 4090 // despite the fact that the critical sections protected by ListLock are | |
| 4091 // extremely short. | |
| 0 | 4092 // |
| 1878 | 4093 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4094 // We should make this a 1st-class type, integrated into the lock | |
| 4095 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4096 // should have sufficient padding to avoid false-sharing and excessive | |
| 4097 // cache-coherency traffic. | |
| 4098 | |
| 4099 | |
| 4100 typedef volatile int SpinLockT ; | |
| 4101 | |
| 4102 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4103 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4104 return ; // normal fast-path return | |
| 4105 } | |
| 4106 | |
| 4107 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4108 TEVENT (SpinAcquire - ctx) ; | |
| 4109 int ctr = 0 ; | |
| 4110 int Yields = 0 ; | |
| 0 | 4111 for (;;) { |
| 1878 | 4112 while (*adr != 0) { |
| 4113 ++ctr ; | |
| 4114 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4115 if (Yields > 5) { | |
| 4116 // Consider using a simple NakedSleep() instead. | |
| 4117 // Then SpinAcquire could be called by non-JVM threads | |
| 4118 Thread::current()->_ParkEvent->park(1) ; | |
| 4119 } else { | |
| 4120 os::NakedYield() ; | |
| 4121 ++Yields ; | |
| 4122 } | |
| 4123 } else { | |
| 4124 SpinPause() ; | |
| 0 | 4125 } |
| 1878 | 4126 } |
| 4127 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4128 } |
| 4129 } | |
| 4130 | |
| 1878 | 4131 void Thread::SpinRelease (volatile int * adr) { |
| 4132 assert (*adr != 0, "invariant") ; | |
| 4133 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4134 // Roach-motel semantics. | |
| 4135 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4136 // but prior LDs and STs within the critical section can't be allowed | |
| 4137 // to reorder or float past the ST that releases the lock. | |
| 4138 *adr = 0 ; | |
| 0 | 4139 } |
| 4140 | |
| 1878 | 4141 // muxAcquire and muxRelease: |
| 4142 // | |
| 4143 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4144 // The LSB of the word is set IFF the lock is held. | |
| 4145 // The remainder of the word points to the head of a singly-linked list | |
| 4146 // of threads blocked on the lock. | |
| 4147 // | |
| 4148 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4149 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4150 // minimizing the peak number of extant ParkEvent instances then | |
| 4151 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4152 // as certain invariants were satisfied. Specifically, care would need | |
| 4153 // to be taken with regards to consuming unpark() "permits". | |
| 4154 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4155 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4156 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4157 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4158 // One way around this would be to widen the restricted-range semaphore | |
| 4159 // implemented in park(). Another alternative would be to provide | |
| 4160 // multiple instances of the PlatformEvent() for each thread. One | |
| 4161 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4162 // | |
| 4163 // * Usage: | |
| 4164 // -- Only as leaf locks | |
| 4165 // -- for short-term locking only as muxAcquire does not perform | |
| 4166 // thread state transitions. | |
| 4167 // | |
| 4168 // Alternatives: | |
| 4169 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4170 // but with parking or spin-then-park instead of pure spinning. | |
| 4171 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4172 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4173 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4174 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4175 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4176 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4177 // boundaries by using placement-new. | |
| 4178 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4179 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4180 // The validity of the backlinks must be ratified before we trust the value. | |
| 4181 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4182 // the forward links, which are always trustworthy. | |
| 4183 // * Add a successor indication. The LockWord is currently encoded as | |
| 4184 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4185 // to provide the usual futile-wakeup optimization. | |
| 4186 // See RTStt for details. | |
| 4187 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4188 // | |
| 4189 | |
| 4190 | |
| 4191 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4192 enum MuxBits { LOCKBIT = 1 } ; | |
| 4193 | |
| 4194 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4195 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4196 if (w == 0) return ; | |
| 4197 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4198 return ; | |
| 4199 } | |
| 4200 | |
| 4201 TEVENT (muxAcquire - Contention) ; | |
| 4202 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4203 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4204 for (;;) { |
| 1878 | 4205 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4206 | |
| 4207 // Optional spin phase: spin-then-park strategy | |
| 4208 while (--its >= 0) { | |
| 4209 w = *Lock ; | |
| 4210 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4211 return ; | |
| 4212 } | |
| 4213 } | |
| 4214 | |
| 4215 Self->reset() ; | |
| 4216 Self->OnList = intptr_t(Lock) ; | |
| 4217 // The following fence() isn't _strictly necessary as the subsequent | |
| 4218 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4219 OrderAccess::fence(); | |
| 4220 for (;;) { | |
| 4221 w = *Lock ; | |
| 4222 if ((w & LOCKBIT) == 0) { | |
| 4223 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4224 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4225 return ; | |
| 4226 } | |
| 4227 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4228 } |
| 1878 | 4229 assert (w & LOCKBIT, "invariant") ; |
| 4230 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4231 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4232 } | |
| 4233 | |
| 4234 while (Self->OnList != 0) { | |
| 4235 Self->park() ; | |
| 4236 } | |
| 0 | 4237 } |
| 4238 } | |
| 4239 | |
| 1878 | 4240 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4241 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4242 if (w == 0) return ; | |
| 4243 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4244 return ; | |
| 4245 } | |
| 4246 | |
| 4247 TEVENT (muxAcquire - Contention) ; | |
| 4248 ParkEvent * ReleaseAfter = NULL ; | |
| 4249 if (ev == NULL) { | |
| 4250 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4251 } | |
| 4252 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4253 for (;;) { | |
| 4254 guarantee (ev->OnList == 0, "invariant") ; | |
| 4255 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4256 | |
| 4257 // Optional spin phase: spin-then-park strategy | |
| 4258 while (--its >= 0) { | |
| 4259 w = *Lock ; | |
| 4260 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4261 if (ReleaseAfter != NULL) { | |
| 4262 ParkEvent::Release (ReleaseAfter) ; | |
| 4263 } | |
| 4264 return ; | |
| 4265 } | |
| 4266 } | |
| 4267 | |
| 4268 ev->reset() ; | |
| 4269 ev->OnList = intptr_t(Lock) ; | |
| 4270 // The following fence() isn't _strictly necessary as the subsequent | |
| 4271 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4272 OrderAccess::fence(); | |
| 4273 for (;;) { | |
| 4274 w = *Lock ; | |
| 4275 if ((w & LOCKBIT) == 0) { | |
| 4276 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4277 ev->OnList = 0 ; | |
| 4278 // We call ::Release while holding the outer lock, thus | |
| 4279 // artificially lengthening the critical section. | |
| 4280 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4281 // after we've dropped the outer lock. | |
| 4282 if (ReleaseAfter != NULL) { | |
| 4283 ParkEvent::Release (ReleaseAfter) ; | |
| 4284 } | |
| 4285 return ; | |
| 4286 } | |
| 4287 continue ; // Interference -- *Lock changed -- Just retry | |
| 4288 } | |
| 4289 assert (w & LOCKBIT, "invariant") ; | |
| 4290 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4291 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4292 } | |
| 4293 | |
| 4294 while (ev->OnList != 0) { | |
| 4295 ev->park() ; | |
| 4296 } | |
| 4297 } | |
| 4298 } | |
| 4299 | |
| 4300 // Release() must extract a successor from the list and then wake that thread. | |
| 4301 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4302 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4303 // Release() would : | |
| 4304 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4305 // (B) Extract a successor from the private list "in-hand" | |
| 4306 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4307 // If there were any newly arrived threads and the CAS() would fail. | |
| 4308 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4309 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4310 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4311 // The wakee would be responsible for reattaching and remerging before it | |
| 4312 // competed for the lock. | |
| 4313 // | |
| 4314 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4315 // multiple concurrent pushers, but only one popper or detacher. | |
| 4316 // This implementation pops from the head of the list. This is unfair, | |
| 4317 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4318 // (We wake recently run threads first). | |
| 4319 | |
| 4320 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4321 for (;;) { | |
| 4322 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4323 assert (w & LOCKBIT, "invariant") ; | |
| 4324 if (w == LOCKBIT) return ; | |
| 4325 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4326 assert (List != NULL, "invariant") ; | |
| 4327 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4328 ParkEvent * nxt = List->ListNext ; | |
| 4329 | |
| 4330 // The following CAS() releases the lock and pops the head element. | |
| 4331 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4332 continue ; | |
| 4333 } | |
| 4334 List->OnList = 0 ; | |
| 4335 OrderAccess::fence() ; | |
| 4336 List->unpark () ; | |
| 4337 return ; | |
| 4338 } | |
| 4339 } | |
| 4340 | |
| 4341 | |
| 0 | 4342 void Threads::verify() { |
| 4343 ALL_JAVA_THREADS(p) { | |
| 4344 p->verify(); | |
| 4345 } | |
| 4346 VMThread* thread = VMThread::vm_thread(); | |
| 4347 if (thread != NULL) thread->verify(); | |
| 4348 } |