Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 2416:38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
Summary: After appropriate testing, we need to turn on EnableMethodHandles and EnableInvokeDynamic by default.
Reviewed-by: never, kvn, jrose, phh
| author | twisti |
|---|---|
| date | Thu, 31 Mar 2011 02:31:57 -0700 |
| parents | c7f3d0b4570f |
| children | 0654ee04b214 2e038ad0c1d0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "jvmtifiles/jvmtiEnv.hpp" |
| 1972 | 35 #include "memory/oopFactory.hpp" |
| 36 #include "memory/universe.inline.hpp" | |
| 37 #include "oops/instanceKlass.hpp" | |
| 38 #include "oops/objArrayOop.hpp" | |
| 39 #include "oops/oop.inline.hpp" | |
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40 #include "oops/symbol.hpp" |
| 1972 | 41 #include "prims/jvm_misc.hpp" |
| 42 #include "prims/jvmtiExport.hpp" | |
| 43 #include "prims/jvmtiThreadState.hpp" | |
| 44 #include "prims/privilegedStack.hpp" | |
| 45 #include "runtime/aprofiler.hpp" | |
| 46 #include "runtime/arguments.hpp" | |
| 47 #include "runtime/biasedLocking.hpp" | |
| 48 #include "runtime/deoptimization.hpp" | |
| 49 #include "runtime/fprofiler.hpp" | |
| 50 #include "runtime/frame.inline.hpp" | |
| 51 #include "runtime/init.hpp" | |
| 52 #include "runtime/interfaceSupport.hpp" | |
| 53 #include "runtime/java.hpp" | |
| 54 #include "runtime/javaCalls.hpp" | |
| 55 #include "runtime/jniPeriodicChecker.hpp" | |
| 56 #include "runtime/memprofiler.hpp" | |
| 57 #include "runtime/mutexLocker.hpp" | |
| 58 #include "runtime/objectMonitor.hpp" | |
| 59 #include "runtime/osThread.hpp" | |
| 60 #include "runtime/safepoint.hpp" | |
| 61 #include "runtime/sharedRuntime.hpp" | |
| 62 #include "runtime/statSampler.hpp" | |
| 63 #include "runtime/stubRoutines.hpp" | |
| 64 #include "runtime/task.hpp" | |
| 65 #include "runtime/threadCritical.hpp" | |
| 66 #include "runtime/threadLocalStorage.hpp" | |
| 67 #include "runtime/vframe.hpp" | |
| 68 #include "runtime/vframeArray.hpp" | |
| 69 #include "runtime/vframe_hp.hpp" | |
| 70 #include "runtime/vmThread.hpp" | |
| 71 #include "runtime/vm_operations.hpp" | |
| 72 #include "services/attachListener.hpp" | |
| 73 #include "services/management.hpp" | |
| 74 #include "services/threadService.hpp" | |
| 75 #include "utilities/defaultStream.hpp" | |
| 76 #include "utilities/dtrace.hpp" | |
| 77 #include "utilities/events.hpp" | |
| 78 #include "utilities/preserveException.hpp" | |
| 79 #ifdef TARGET_OS_FAMILY_linux | |
| 80 # include "os_linux.inline.hpp" | |
| 81 # include "thread_linux.inline.hpp" | |
| 82 #endif | |
| 83 #ifdef TARGET_OS_FAMILY_solaris | |
| 84 # include "os_solaris.inline.hpp" | |
| 85 # include "thread_solaris.inline.hpp" | |
| 86 #endif | |
| 87 #ifdef TARGET_OS_FAMILY_windows | |
| 88 # include "os_windows.inline.hpp" | |
| 89 # include "thread_windows.inline.hpp" | |
| 90 #endif | |
| 91 #ifndef SERIALGC | |
| 92 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 93 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 94 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 95 #endif | |
| 96 #ifdef COMPILER1 | |
| 97 #include "c1/c1_Compiler.hpp" | |
| 98 #endif | |
| 99 #ifdef COMPILER2 | |
| 100 #include "opto/c2compiler.hpp" | |
| 101 #include "opto/idealGraphPrinter.hpp" | |
| 102 #endif | |
| 0 | 103 |
| 104 #ifdef DTRACE_ENABLED | |
| 105 | |
| 106 // Only bother with this argument setup if dtrace is available | |
| 107 | |
| 108 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
| 109 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 110 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 111 intptr_t, intptr_t, bool); | |
| 112 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 113 intptr_t, intptr_t, bool); | |
| 114 | |
| 115 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 116 { \ | |
| 117 ResourceMark rm(this); \ | |
| 118 int len = 0; \ | |
| 119 const char* name = (javathread)->get_thread_name(); \ | |
| 120 len = strlen(name); \ | |
| 121 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 122 name, len, \ | |
| 123 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 124 (javathread)->osthread()->thread_id(), \ | |
| 125 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 126 } | |
| 127 | |
| 128 #else // ndef DTRACE_ENABLED | |
| 129 | |
| 130 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 131 | |
| 132 #endif // ndef DTRACE_ENABLED | |
| 133 | |
| 134 // Class hierarchy | |
| 135 // - Thread | |
| 136 // - VMThread | |
| 137 // - WatcherThread | |
| 138 // - ConcurrentMarkSweepThread | |
| 139 // - JavaThread | |
| 140 // - CompilerThread | |
| 141 | |
| 142 // ======= Thread ======== | |
| 143 | |
| 144 // Support for forcing alignment of thread objects for biased locking | |
| 145 void* Thread::operator new(size_t size) { | |
| 146 if (UseBiasedLocking) { | |
| 147 const int alignment = markOopDesc::biased_lock_alignment; | |
| 148 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 149 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 150 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 151 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 152 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 153 "JavaThread alignment code overflowed allocated storage"); | |
| 154 if (TraceBiasedLocking) { | |
| 155 if (aligned_addr != real_malloc_addr) | |
| 156 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 157 real_malloc_addr, aligned_addr); | |
| 158 } | |
| 159 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 160 return aligned_addr; | |
| 161 } else { | |
| 162 return CHeapObj::operator new(size); | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 void Thread::operator delete(void* p) { | |
| 167 if (UseBiasedLocking) { | |
| 168 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 169 CHeapObj::operator delete(real_malloc_addr); | |
| 170 } else { | |
| 171 CHeapObj::operator delete(p); | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 | |
| 176 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 177 // JavaThread | |
| 178 | |
| 179 | |
| 180 Thread::Thread() { | |
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181 // stack and get_thread |
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182 set_stack_base(NULL); |
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183 set_stack_size(0); |
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184 set_self_raw_id(0); |
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185 set_lgrp_id(-1); |
| 0 | 186 |
| 187 // allocated data structures | |
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188 set_osthread(NULL); |
| 0 | 189 set_resource_area(new ResourceArea()); |
| 190 set_handle_area(new HandleArea(NULL)); | |
| 191 set_active_handles(NULL); | |
| 192 set_free_handle_block(NULL); | |
| 193 set_last_handle_mark(NULL); | |
| 194 | |
| 195 // This initial value ==> never claimed. | |
| 196 _oops_do_parity = 0; | |
| 197 | |
| 198 // the handle mark links itself to last_handle_mark | |
| 199 new HandleMark(this); | |
| 200 | |
| 201 // plain initialization | |
| 202 debug_only(_owned_locks = NULL;) | |
| 203 debug_only(_allow_allocation_count = 0;) | |
| 204 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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205 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 206 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 207 _jvmti_env_iteration_count = 0; | |
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208 set_allocated_bytes(0); |
| 0 | 209 _vm_operation_started_count = 0; |
| 210 _vm_operation_completed_count = 0; | |
| 211 _current_pending_monitor = NULL; | |
| 212 _current_pending_monitor_is_from_java = true; | |
| 213 _current_waiting_monitor = NULL; | |
| 214 _num_nested_signal = 0; | |
| 215 omFreeList = NULL ; | |
| 216 omFreeCount = 0 ; | |
| 217 omFreeProvision = 32 ; | |
| 1587 | 218 omInUseList = NULL ; |
| 219 omInUseCount = 0 ; | |
| 0 | 220 |
| 221 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 222 _suspend_flags = 0; | |
| 223 | |
| 224 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 225 _hashStateX = os::random() ; | |
| 226 _hashStateY = 842502087 ; | |
| 227 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 228 _hashStateW = 273326509 ; | |
| 229 | |
| 230 _OnTrap = 0 ; | |
| 231 _schedctl = NULL ; | |
| 232 _Stalled = 0 ; | |
| 233 _TypeTag = 0x2BAD ; | |
| 234 | |
| 235 // Many of the following fields are effectively final - immutable | |
| 236 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 237 // construct until the _MutexEvent is initialized ... | |
| 238 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 239 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 240 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 241 // and ::Release() | |
| 242 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 243 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 244 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 245 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 246 | |
| 247 #ifdef CHECK_UNHANDLED_OOPS | |
| 248 if (CheckUnhandledOops) { | |
| 249 _unhandled_oops = new UnhandledOops(this); | |
| 250 } | |
| 251 #endif // CHECK_UNHANDLED_OOPS | |
| 252 #ifdef ASSERT | |
| 253 if (UseBiasedLocking) { | |
| 254 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 255 assert(this == _real_malloc_address || | |
| 256 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 257 "bug in forced alignment of thread objects"); | |
| 258 } | |
| 259 #endif /* ASSERT */ | |
| 260 } | |
| 261 | |
| 262 void Thread::initialize_thread_local_storage() { | |
| 263 // Note: Make sure this method only calls | |
| 264 // non-blocking operations. Otherwise, it might not work | |
| 265 // with the thread-startup/safepoint interaction. | |
| 266 | |
| 267 // During Java thread startup, safepoint code should allow this | |
| 268 // method to complete because it may need to allocate memory to | |
| 269 // store information for the new thread. | |
| 270 | |
| 271 // initialize structure dependent on thread local storage | |
| 272 ThreadLocalStorage::set_thread(this); | |
| 273 | |
| 274 // set up any platform-specific state. | |
| 275 os::initialize_thread(); | |
| 276 | |
| 277 } | |
| 278 | |
| 279 void Thread::record_stack_base_and_size() { | |
| 280 set_stack_base(os::current_stack_base()); | |
| 281 set_stack_size(os::current_stack_size()); | |
| 282 } | |
| 283 | |
| 284 | |
| 285 Thread::~Thread() { | |
| 286 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 287 ObjectSynchronizer::omFlush (this) ; | |
| 288 | |
| 289 // deallocate data structures | |
| 290 delete resource_area(); | |
| 291 // since the handle marks are using the handle area, we have to deallocated the root | |
| 292 // handle mark before deallocating the thread's handle area, | |
| 293 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 294 delete last_handle_mark(); | |
| 295 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 296 | |
| 297 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 298 // We NULL out the fields for good hygiene. | |
| 299 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 300 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 301 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 302 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 303 | |
| 304 delete handle_area(); | |
| 305 | |
| 306 // osthread() can be NULL, if creation of thread failed. | |
| 307 if (osthread() != NULL) os::free_thread(osthread()); | |
| 308 | |
| 309 delete _SR_lock; | |
| 310 | |
| 311 // clear thread local storage if the Thread is deleting itself | |
| 312 if (this == Thread::current()) { | |
| 313 ThreadLocalStorage::set_thread(NULL); | |
| 314 } else { | |
| 315 // In the case where we're not the current thread, invalidate all the | |
| 316 // caches in case some code tries to get the current thread or the | |
| 317 // thread that was destroyed, and gets stale information. | |
| 318 ThreadLocalStorage::invalidate_all(); | |
| 319 } | |
| 320 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 321 } | |
| 322 | |
| 323 // NOTE: dummy function for assertion purpose. | |
| 324 void Thread::run() { | |
| 325 ShouldNotReachHere(); | |
| 326 } | |
| 327 | |
| 328 #ifdef ASSERT | |
| 329 // Private method to check for dangling thread pointer | |
| 330 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 331 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 332 "possibility of dangling Thread pointer"); | |
| 333 } | |
| 334 #endif | |
| 335 | |
| 336 | |
| 337 #ifndef PRODUCT | |
| 338 // Tracing method for basic thread operations | |
| 339 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 340 if (!TraceThreadEvents) return; | |
| 341 ResourceMark rm; | |
| 342 ThreadCritical tc; | |
| 343 const char *name = "non-Java thread"; | |
| 344 int prio = -1; | |
| 345 if (thread->is_Java_thread() | |
| 346 && !thread->is_Compiler_thread()) { | |
| 347 // The Threads_lock must be held to get information about | |
| 348 // this thread but may not be in some situations when | |
| 349 // tracing thread events. | |
| 350 bool release_Threads_lock = false; | |
| 351 if (!Threads_lock->owned_by_self()) { | |
| 352 Threads_lock->lock(); | |
| 353 release_Threads_lock = true; | |
| 354 } | |
| 355 JavaThread* jt = (JavaThread *)thread; | |
| 356 name = (char *)jt->get_thread_name(); | |
| 357 oop thread_oop = jt->threadObj(); | |
| 358 if (thread_oop != NULL) { | |
| 359 prio = java_lang_Thread::priority(thread_oop); | |
| 360 } | |
| 361 if (release_Threads_lock) { | |
| 362 Threads_lock->unlock(); | |
| 363 } | |
| 364 } | |
| 365 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 366 } | |
| 367 #endif | |
| 368 | |
| 369 | |
| 370 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 371 trace("get priority", thread); | |
| 372 ThreadPriority priority; | |
| 373 // Can return an error! | |
| 374 (void)os::get_priority(thread, priority); | |
| 375 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 376 return priority; | |
| 377 } | |
| 378 | |
| 379 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 380 trace("set priority", thread); | |
| 381 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 382 // Can return an error! | |
| 383 (void)os::set_priority(thread, priority); | |
| 384 } | |
| 385 | |
| 386 | |
| 387 void Thread::start(Thread* thread) { | |
| 388 trace("start", thread); | |
| 389 // Start is different from resume in that its safety is guaranteed by context or | |
| 390 // being called from a Java method synchronized on the Thread object. | |
| 391 if (!DisableStartThread) { | |
| 392 if (thread->is_Java_thread()) { | |
| 393 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 394 // Can not set it after the thread started because we do not know the | |
| 395 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 396 // in SLEEPING or some other state. | |
| 397 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 398 java_lang_Thread::RUNNABLE); | |
| 399 } | |
| 400 os::start_thread(thread); | |
| 401 } | |
| 402 } | |
| 403 | |
| 404 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 405 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 406 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 407 VMThread::execute(vm_stop); | |
| 408 } | |
| 409 | |
| 410 | |
| 411 // | |
| 412 // Check if an external suspend request has completed (or has been | |
| 413 // cancelled). Returns true if the thread is externally suspended and | |
| 414 // false otherwise. | |
| 415 // | |
| 416 // The bits parameter returns information about the code path through | |
| 417 // the routine. Useful for debugging: | |
| 418 // | |
| 419 // set in is_ext_suspend_completed(): | |
| 420 // 0x00000001 - routine was entered | |
| 421 // 0x00000010 - routine return false at end | |
| 422 // 0x00000100 - thread exited (return false) | |
| 423 // 0x00000200 - suspend request cancelled (return false) | |
| 424 // 0x00000400 - thread suspended (return true) | |
| 425 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 426 // 0x00002000 - thread is native and walkable (return true) | |
| 427 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 428 // | |
| 429 // set in wait_for_ext_suspend_completion(): | |
| 430 // 0x00010000 - routine was entered | |
| 431 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 432 // 0x00040000 - thread suspended before loop (return true) | |
| 433 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 434 // 0x00100000 - thread suspended in loop (return true) | |
| 435 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 436 // | |
| 437 | |
| 438 // Helper class for tracing suspend wait debug bits. | |
| 439 // | |
| 440 // 0x00000100 indicates that the target thread exited before it could | |
| 441 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 442 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 443 // count as wait failures either. | |
| 444 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 445 | |
| 446 class TraceSuspendDebugBits : public StackObj { | |
| 447 private: | |
| 448 JavaThread * jt; | |
| 449 bool is_wait; | |
| 450 bool called_by_wait; // meaningful when !is_wait | |
| 451 uint32_t * bits; | |
| 452 | |
| 453 public: | |
| 454 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 455 uint32_t *_bits) { | |
| 456 jt = _jt; | |
| 457 is_wait = _is_wait; | |
| 458 called_by_wait = _called_by_wait; | |
| 459 bits = _bits; | |
| 460 } | |
| 461 | |
| 462 ~TraceSuspendDebugBits() { | |
| 463 if (!is_wait) { | |
| 464 #if 1 | |
| 465 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 466 // That trace is very chatty. | |
| 467 return; | |
| 468 #else | |
| 469 if (!called_by_wait) { | |
| 470 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 471 // trace calls to it from wait_for_ext_suspend_completion() | |
| 472 return; | |
| 473 } | |
| 474 #endif | |
| 475 } | |
| 476 | |
| 477 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 478 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 479 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 480 ResourceMark rm; | |
| 481 | |
| 482 tty->print_cr( | |
| 483 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 484 jt->get_thread_name(), *bits); | |
| 485 | |
| 486 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 487 } | |
| 488 } | |
| 489 } | |
| 490 }; | |
| 491 #undef DEBUG_FALSE_BITS | |
| 492 | |
| 493 | |
| 494 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 495 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 496 | |
| 497 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 498 bool do_trans_retry; // flag to force the retry | |
| 499 | |
| 500 *bits |= 0x00000001; | |
| 501 | |
| 502 do { | |
| 503 do_trans_retry = false; | |
| 504 | |
| 505 if (is_exiting()) { | |
| 506 // Thread is in the process of exiting. This is always checked | |
| 507 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 508 *bits |= 0x00000100; | |
| 509 return false; | |
| 510 } | |
| 511 | |
| 512 if (!is_external_suspend()) { | |
| 513 // Suspend request is cancelled. This is always checked before | |
| 514 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 515 // confusing the thread that made the suspend request. | |
| 516 *bits |= 0x00000200; | |
| 517 return false; | |
| 518 } | |
| 519 | |
| 520 if (is_ext_suspended()) { | |
| 521 // thread is suspended | |
| 522 *bits |= 0x00000400; | |
| 523 return true; | |
| 524 } | |
| 525 | |
| 526 // Now that we no longer do hard suspends of threads running | |
| 527 // native code, the target thread can be changing thread state | |
| 528 // while we are in this routine: | |
| 529 // | |
| 530 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 531 // | |
| 532 // We save a copy of the thread state as observed at this moment | |
| 533 // and make our decision about suspend completeness based on the | |
| 534 // copy. This closes the race where the thread state is seen as | |
| 535 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 536 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 537 JavaThreadState save_state = thread_state(); | |
| 538 | |
| 539 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 540 // If the thread's state is _thread_blocked and this blocking | |
| 541 // condition is known to be equivalent to a suspend, then we can | |
| 542 // consider the thread to be externally suspended. This means that | |
| 543 // the code that sets _thread_blocked has been modified to do | |
| 544 // self-suspension if the blocking condition releases. We also | |
| 545 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 546 // the _thread_blocked with self-suspension check. | |
| 547 // | |
| 548 // Return true since we wouldn't be here unless there was still an | |
| 549 // external suspend request. | |
| 550 *bits |= 0x00001000; | |
| 551 return true; | |
| 552 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 553 // Threads running native code will self-suspend on native==>VM/Java | |
| 554 // transitions. If its stack is walkable (should always be the case | |
| 555 // unless this function is called before the actual java_suspend() | |
| 556 // call), then the wait is done. | |
| 557 *bits |= 0x00002000; | |
| 558 return true; | |
| 559 } else if (!called_by_wait && !did_trans_retry && | |
| 560 save_state == _thread_in_native_trans && | |
| 561 frame_anchor()->walkable()) { | |
| 562 // The thread is transitioning from thread_in_native to another | |
| 563 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 564 // will force the thread to self-suspend. If it hasn't gotten | |
| 565 // there yet we may have caught the thread in-between the native | |
| 566 // code check above and the self-suspend. Lucky us. If we were | |
| 567 // called by wait_for_ext_suspend_completion(), then it | |
| 568 // will be doing the retries so we don't have to. | |
| 569 // | |
| 570 // Since we use the saved thread state in the if-statement above, | |
| 571 // there is a chance that the thread has already transitioned to | |
| 572 // _thread_blocked by the time we get here. In that case, we will | |
| 573 // make a single unnecessary pass through the logic below. This | |
| 574 // doesn't hurt anything since we still do the trans retry. | |
| 575 | |
| 576 *bits |= 0x00004000; | |
| 577 | |
| 578 // Once the thread leaves thread_in_native_trans for another | |
| 579 // thread state, we break out of this retry loop. We shouldn't | |
| 580 // need this flag to prevent us from getting back here, but | |
| 581 // sometimes paranoia is good. | |
| 582 did_trans_retry = true; | |
| 583 | |
| 584 // We wait for the thread to transition to a more usable state. | |
| 585 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 586 // We used to do an "os::yield_all(i)" call here with the intention | |
| 587 // that yielding would increase on each retry. However, the parameter | |
| 588 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 589 // on the SR_lock below provides a much more predictable scale up for | |
| 590 // the delay. It also provides a simple/direct point to check for any | |
| 591 // safepoint requests from the VMThread | |
| 592 | |
| 593 // temporarily drops SR_lock while doing wait with safepoint check | |
| 594 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 595 // and increase delay with each retry | |
| 596 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 597 | |
| 598 // check the actual thread state instead of what we saved above | |
| 599 if (thread_state() != _thread_in_native_trans) { | |
| 600 // the thread has transitioned to another thread state so | |
| 601 // try all the checks (except this one) one more time. | |
| 602 do_trans_retry = true; | |
| 603 break; | |
| 604 } | |
| 605 } // end retry loop | |
| 606 | |
| 607 | |
| 608 } | |
| 609 } while (do_trans_retry); | |
| 610 | |
| 611 *bits |= 0x00000010; | |
| 612 return false; | |
| 613 } | |
| 614 | |
| 615 // | |
| 616 // Wait for an external suspend request to complete (or be cancelled). | |
| 617 // Returns true if the thread is externally suspended and false otherwise. | |
| 618 // | |
| 619 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 620 uint32_t *bits) { | |
| 621 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 622 false /* !called_by_wait */, bits); | |
| 623 | |
| 624 // local flag copies to minimize SR_lock hold time | |
| 625 bool is_suspended; | |
| 626 bool pending; | |
| 627 uint32_t reset_bits; | |
| 628 | |
| 629 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 630 *bits |= 0x00010000; | |
| 631 | |
| 632 // We use reset_bits to reinitialize the bits value at the top of | |
| 633 // each retry loop. This allows the caller to make use of any | |
| 634 // unused bits for their own marking purposes. | |
| 635 reset_bits = *bits; | |
| 636 | |
| 637 { | |
| 638 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 639 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 640 delay, bits); | |
| 641 pending = is_external_suspend(); | |
| 642 } | |
| 643 // must release SR_lock to allow suspension to complete | |
| 644 | |
| 645 if (!pending) { | |
| 646 // A cancelled suspend request is the only false return from | |
| 647 // is_ext_suspend_completed() that keeps us from entering the | |
| 648 // retry loop. | |
| 649 *bits |= 0x00020000; | |
| 650 return false; | |
| 651 } | |
| 652 | |
| 653 if (is_suspended) { | |
| 654 *bits |= 0x00040000; | |
| 655 return true; | |
| 656 } | |
| 657 | |
| 658 for (int i = 1; i <= retries; i++) { | |
| 659 *bits = reset_bits; // reinit to only track last retry | |
| 660 | |
| 661 // We used to do an "os::yield_all(i)" call here with the intention | |
| 662 // that yielding would increase on each retry. However, the parameter | |
| 663 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 664 // on the SR_lock below provides a much more predictable scale up for | |
| 665 // the delay. It also provides a simple/direct point to check for any | |
| 666 // safepoint requests from the VMThread | |
| 667 | |
| 668 { | |
| 669 MutexLocker ml(SR_lock()); | |
| 670 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 671 // can also call this) and increase delay with each retry | |
| 672 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 673 | |
| 674 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 675 delay, bits); | |
| 676 | |
| 677 // It is possible for the external suspend request to be cancelled | |
| 678 // (by a resume) before the actual suspend operation is completed. | |
| 679 // Refresh our local copy to see if we still need to wait. | |
| 680 pending = is_external_suspend(); | |
| 681 } | |
| 682 | |
| 683 if (!pending) { | |
| 684 // A cancelled suspend request is the only false return from | |
| 685 // is_ext_suspend_completed() that keeps us from staying in the | |
| 686 // retry loop. | |
| 687 *bits |= 0x00080000; | |
| 688 return false; | |
| 689 } | |
| 690 | |
| 691 if (is_suspended) { | |
| 692 *bits |= 0x00100000; | |
| 693 return true; | |
| 694 } | |
| 695 } // end retry loop | |
| 696 | |
| 697 // thread did not suspend after all our retries | |
| 698 *bits |= 0x00200000; | |
| 699 return false; | |
| 700 } | |
| 701 | |
| 702 #ifndef PRODUCT | |
| 703 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 704 | |
| 705 // This should not need to be atomic as the only way for simultaneous | |
| 706 // updates is via interrupts. Even then this should be rare or non-existant | |
| 707 // and we don't care that much anyway. | |
| 708 | |
| 709 int index = _jmp_ring_index; | |
| 710 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 711 _jmp_ring[index]._target = (intptr_t) target; | |
| 712 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 713 _jmp_ring[index]._file = file; | |
| 714 _jmp_ring[index]._line = line; | |
| 715 } | |
| 716 #endif /* PRODUCT */ | |
| 717 | |
| 718 // Called by flat profiler | |
| 719 // Callers have already called wait_for_ext_suspend_completion | |
| 720 // The assertion for that is currently too complex to put here: | |
| 721 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 722 bool gotframe = false; | |
| 723 // self suspension saves needed state. | |
| 724 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 725 *_fr = pd_last_frame(); | |
| 726 gotframe = true; | |
| 727 } | |
| 728 return gotframe; | |
| 729 } | |
| 730 | |
| 731 void Thread::interrupt(Thread* thread) { | |
| 732 trace("interrupt", thread); | |
| 733 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 734 os::interrupt(thread); | |
| 735 } | |
| 736 | |
| 737 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 738 trace("is_interrupted", thread); | |
| 739 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 740 // Note: If clear_interrupted==false, this simply fetches and | |
| 741 // returns the value of the field osthread()->interrupted(). | |
| 742 return os::is_interrupted(thread, clear_interrupted); | |
| 743 } | |
| 744 | |
| 745 | |
| 746 // GC Support | |
| 747 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 748 jint thread_parity = _oops_do_parity; | |
| 749 if (thread_parity != strong_roots_parity) { | |
| 750 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
| 751 if (res == thread_parity) return true; | |
| 752 else { | |
| 753 guarantee(res == strong_roots_parity, "Or else what?"); | |
| 754 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 755 "Should only fail when parallel."); | |
| 756 return false; | |
| 757 } | |
| 758 } | |
| 759 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 760 "Should only fail when parallel."); | |
| 761 return false; | |
| 762 } | |
| 763 | |
|
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764 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 765 active_handles()->oops_do(f); |
| 766 // Do oop for ThreadShadow | |
| 767 f->do_oop((oop*)&_pending_exception); | |
| 768 handle_area()->oops_do(f); | |
| 769 } | |
| 770 | |
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771 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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772 // no nmethods in a generic thread... |
| 0 | 773 } |
| 774 | |
| 775 void Thread::print_on(outputStream* st) const { | |
| 776 // get_priority assumes osthread initialized | |
| 777 if (osthread() != NULL) { | |
| 778 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 779 osthread()->print_on(st); | |
| 780 } | |
| 781 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 782 } | |
| 783 | |
| 784 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 785 // any lock or allocate memory. | |
| 786 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 787 if (is_VM_thread()) st->print("VMThread"); | |
| 788 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 789 else if (is_Java_thread()) st->print("JavaThread"); | |
| 790 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 791 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 792 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 793 else st->print("Thread"); | |
| 794 | |
| 795 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 796 _stack_base - _stack_size, _stack_base); | |
| 797 | |
| 798 if (osthread()) { | |
| 799 st->print(" [id=%d]", osthread()->thread_id()); | |
| 800 } | |
| 801 } | |
| 802 | |
| 803 #ifdef ASSERT | |
| 804 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 805 Monitor *cur = _owned_locks; | |
| 806 if (cur == NULL) { | |
| 807 st->print(" (no locks) "); | |
| 808 } else { | |
| 809 st->print_cr(" Locks owned:"); | |
| 810 while(cur) { | |
| 811 cur->print_on(st); | |
| 812 cur = cur->next(); | |
| 813 } | |
| 814 } | |
| 815 } | |
| 816 | |
| 817 static int ref_use_count = 0; | |
| 818 | |
| 819 bool Thread::owns_locks_but_compiled_lock() const { | |
| 820 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 821 if (cur != Compile_lock) return true; | |
| 822 } | |
| 823 return false; | |
| 824 } | |
| 825 | |
| 826 | |
| 827 #endif | |
| 828 | |
| 829 #ifndef PRODUCT | |
| 830 | |
| 831 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 832 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 833 // no threads which allow_vm_block's are held | |
| 834 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 835 // Check if current thread is allowed to block at a safepoint | |
| 836 if (!(_allow_safepoint_count == 0)) | |
| 837 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 838 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 839 fatal("LEAF method calling lock?"); | |
| 840 } | |
| 841 | |
| 842 #ifdef ASSERT | |
| 843 if (potential_vm_operation && is_Java_thread() | |
| 844 && !Universe::is_bootstrapping()) { | |
| 845 // Make sure we do not hold any locks that the VM thread also uses. | |
| 846 // This could potentially lead to deadlocks | |
| 847 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 848 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 849 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 850 // since it is used to transfer control between JavaThreads and the VMThread | |
| 851 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 852 if ( (cur->allow_vm_block() && | |
| 853 cur != Threads_lock && | |
| 854 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 855 cur != VMOperationRequest_lock && | |
| 856 cur != VMOperationQueue_lock) || | |
| 857 cur->rank() == Mutex::special) { | |
| 858 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 859 } | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 if (GCALotAtAllSafepoints) { | |
| 864 // We could enter a safepoint here and thus have a gc | |
| 865 InterfaceSupport::check_gc_alot(); | |
| 866 } | |
| 867 #endif | |
| 868 } | |
| 869 #endif | |
| 870 | |
| 871 bool Thread::is_in_stack(address adr) const { | |
| 872 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 873 address end = os::current_stack_pointer(); | |
| 874 if (stack_base() >= adr && adr >= end) return true; | |
| 875 | |
| 876 return false; | |
| 877 } | |
| 878 | |
| 879 | |
| 880 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 881 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 882 // used for compilation in the future. If that change is made, the need for these methods | |
| 883 // should be revisited, and they should be removed if possible. | |
| 884 | |
| 885 bool Thread::is_lock_owned(address adr) const { | |
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886 return on_local_stack(adr); |
| 0 | 887 } |
| 888 | |
| 889 bool Thread::set_as_starting_thread() { | |
| 890 // NOTE: this must be called inside the main thread. | |
| 891 return os::create_main_thread((JavaThread*)this); | |
| 892 } | |
| 893 | |
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894 static void initialize_class(Symbol* class_name, TRAPS) { |
| 0 | 895 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
| 896 instanceKlass::cast(klass)->initialize(CHECK); | |
| 897 } | |
| 898 | |
| 899 | |
| 900 // Creates the initial ThreadGroup | |
| 901 static Handle create_initial_thread_group(TRAPS) { | |
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902 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 903 instanceKlassHandle klass (THREAD, k); |
| 904 | |
| 905 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 906 { | |
| 907 JavaValue result(T_VOID); | |
| 908 JavaCalls::call_special(&result, | |
| 909 system_instance, | |
| 910 klass, | |
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911 vmSymbols::object_initializer_name(), |
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912 vmSymbols::void_method_signature(), |
| 0 | 913 CHECK_NH); |
| 914 } | |
| 915 Universe::set_system_thread_group(system_instance()); | |
| 916 | |
| 917 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 918 { | |
| 919 JavaValue result(T_VOID); | |
| 920 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 921 JavaCalls::call_special(&result, | |
| 922 main_instance, | |
| 923 klass, | |
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924 vmSymbols::object_initializer_name(), |
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925 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 926 system_instance, |
| 927 string, | |
| 928 CHECK_NH); | |
| 929 } | |
| 930 return main_instance; | |
| 931 } | |
| 932 | |
| 933 // Creates the initial Thread | |
| 934 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
|
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935 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 936 instanceKlassHandle klass (THREAD, k); |
| 937 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 938 | |
| 939 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 940 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 941 thread->set_threadObj(thread_oop()); | |
| 942 | |
| 943 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 944 | |
| 945 JavaValue result(T_VOID); | |
| 946 JavaCalls::call_special(&result, thread_oop, | |
| 947 klass, | |
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948 vmSymbols::object_initializer_name(), |
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949 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 950 thread_group, |
| 951 string, | |
| 952 CHECK_NULL); | |
| 953 return thread_oop(); | |
| 954 } | |
| 955 | |
| 956 static void call_initializeSystemClass(TRAPS) { | |
|
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957 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 958 instanceKlassHandle klass (THREAD, k); |
| 959 | |
| 960 JavaValue result(T_VOID); | |
|
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961 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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962 vmSymbols::void_method_signature(), CHECK); |
| 0 | 963 } |
| 964 | |
|
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965 // General purpose hook into Java code, run once when the VM is initialized. |
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966 // The Java library method itself may be changed independently from the VM. |
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967 static void call_postVMInitHook(TRAPS) { |
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968 klassOop k = SystemDictionary::sun_misc_PostVMInitHook_klass(); |
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969 instanceKlassHandle klass (THREAD, k); |
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970 if (klass.not_null()) { |
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971 JavaValue result(T_VOID); |
|
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972 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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973 vmSymbols::void_method_signature(), |
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974 CHECK); |
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975 } |
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976 } |
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977 |
| 0 | 978 static void reset_vm_info_property(TRAPS) { |
| 979 // the vm info string | |
| 980 ResourceMark rm(THREAD); | |
| 981 const char *vm_info = VM_Version::vm_info_string(); | |
| 982 | |
| 983 // java.lang.System class | |
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984 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 985 instanceKlassHandle klass (THREAD, k); |
| 986 | |
| 987 // setProperty arguments | |
| 988 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 989 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 990 | |
| 991 // return value | |
| 992 JavaValue r(T_OBJECT); | |
| 993 | |
| 994 // public static String setProperty(String key, String value); | |
| 995 JavaCalls::call_static(&r, | |
| 996 klass, | |
|
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997 vmSymbols::setProperty_name(), |
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998 vmSymbols::string_string_string_signature(), |
| 0 | 999 key_str, |
| 1000 value_str, | |
| 1001 CHECK); | |
| 1002 } | |
| 1003 | |
| 1004 | |
| 1005 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1006 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1007 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1008 | |
|
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1009 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1010 instanceKlassHandle klass (THREAD, k); |
| 1011 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1012 | |
| 1013 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1014 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1015 set_threadObj(thread_oop()); | |
| 1016 | |
| 1017 JavaValue result(T_VOID); | |
| 1018 if (thread_name != NULL) { | |
| 1019 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1020 // Thread gets assigned specified name and null target | |
| 1021 JavaCalls::call_special(&result, | |
| 1022 thread_oop, | |
| 1023 klass, | |
|
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1024 vmSymbols::object_initializer_name(), |
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1025 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1026 thread_group, // Argument 1 |
| 1027 name, // Argument 2 | |
| 1028 THREAD); | |
| 1029 } else { | |
| 1030 // Thread gets assigned name "Thread-nnn" and null target | |
| 1031 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1032 JavaCalls::call_special(&result, | |
| 1033 thread_oop, | |
| 1034 klass, | |
|
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1035 vmSymbols::object_initializer_name(), |
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1036 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1037 thread_group, // Argument 1 |
| 1038 Handle(), // Argument 2 | |
| 1039 THREAD); | |
| 1040 } | |
| 1041 | |
| 1042 | |
| 1043 if (daemon) { | |
| 1044 java_lang_Thread::set_daemon(thread_oop()); | |
| 1045 } | |
| 1046 | |
| 1047 if (HAS_PENDING_EXCEPTION) { | |
| 1048 return; | |
| 1049 } | |
| 1050 | |
| 1142 | 1051 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1052 Handle threadObj(this, this->threadObj()); |
| 1053 | |
| 1054 JavaCalls::call_special(&result, | |
| 1055 thread_group, | |
| 1056 group, | |
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1057 vmSymbols::add_method_name(), |
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1058 vmSymbols::thread_void_signature(), |
| 0 | 1059 threadObj, // Arg 1 |
| 1060 THREAD); | |
| 1061 | |
| 1062 | |
| 1063 } | |
| 1064 | |
| 1065 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1066 // uniquely named instances should derive from this. | |
| 1067 NamedThread::NamedThread() : Thread() { | |
| 1068 _name = NULL; | |
|
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1069 _processed_thread = NULL; |
| 0 | 1070 } |
| 1071 | |
| 1072 NamedThread::~NamedThread() { | |
| 1073 if (_name != NULL) { | |
| 1074 FREE_C_HEAP_ARRAY(char, _name); | |
| 1075 _name = NULL; | |
| 1076 } | |
| 1077 } | |
| 1078 | |
| 1079 void NamedThread::set_name(const char* format, ...) { | |
| 1080 guarantee(_name == NULL, "Only get to set name once."); | |
| 1081 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 1082 guarantee(_name != NULL, "alloc failure"); | |
| 1083 va_list ap; | |
| 1084 va_start(ap, format); | |
| 1085 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1086 va_end(ap); | |
| 1087 } | |
| 1088 | |
| 1089 // ======= WatcherThread ======== | |
| 1090 | |
| 1091 // The watcher thread exists to simulate timer interrupts. It should | |
| 1092 // be replaced by an abstraction over whatever native support for | |
| 1093 // timer interrupts exists on the platform. | |
| 1094 | |
| 1095 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1096 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1097 |
| 1098 WatcherThread::WatcherThread() : Thread() { | |
| 1099 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1100 if (os::create_thread(this, os::watcher_thread)) { | |
| 1101 _watcher_thread = this; | |
| 1102 | |
| 1103 // Set the watcher thread to the highest OS priority which should not be | |
| 1104 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1105 // is created. The only normal thread using this priority is the reference | |
| 1106 // handler thread, which runs for very short intervals only. | |
| 1107 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1108 // will be inaccurate. | |
| 1109 os::set_priority(this, MaxPriority); | |
| 1110 if (!DisableStartThread) { | |
| 1111 os::start_thread(this); | |
| 1112 } | |
| 1113 } | |
| 1114 } | |
| 1115 | |
| 1116 void WatcherThread::run() { | |
| 1117 assert(this == watcher_thread(), "just checking"); | |
| 1118 | |
| 1119 this->record_stack_base_and_size(); | |
| 1120 this->initialize_thread_local_storage(); | |
| 1121 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1122 while(!_should_terminate) { | |
| 1123 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1124 assert(watcher_thread() == this, "thread consistency check"); | |
| 1125 | |
| 1126 // Calculate how long it'll be until the next PeriodicTask work | |
| 1127 // should be done, and sleep that amount of time. | |
|
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1128 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1129 |
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1130 // we expect this to timeout - we only ever get unparked when |
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1131 // we should terminate |
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1132 { |
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1133 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1134 |
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1135 jlong prev_time = os::javaTimeNanos(); |
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1136 for (;;) { |
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1137 int res= _SleepEvent->park(time_to_wait); |
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1138 if (res == OS_TIMEOUT || _should_terminate) |
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1139 break; |
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1140 // spurious wakeup of some kind |
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1141 jlong now = os::javaTimeNanos(); |
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1142 time_to_wait -= (now - prev_time) / 1000000; |
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1143 if (time_to_wait <= 0) |
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1144 break; |
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1145 prev_time = now; |
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1146 } |
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1147 } |
| 0 | 1148 |
| 1149 if (is_error_reported()) { | |
| 1150 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1151 // should abort JVM after creating an error log file. However in some | |
| 1152 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1153 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1154 // | |
| 1155 // This code is in WatcherThread because WatcherThread wakes up | |
| 1156 // periodically so the fatal error handler doesn't need to do anything; | |
| 1157 // also because the WatcherThread is less likely to crash than other | |
| 1158 // threads. | |
| 1159 | |
| 1160 for (;;) { | |
| 1161 if (!ShowMessageBoxOnError | |
| 1162 && (OnError == NULL || OnError[0] == '\0') | |
| 1163 && Arguments::abort_hook() == NULL) { | |
| 1164 os::sleep(this, 2 * 60 * 1000, false); | |
| 1165 fdStream err(defaultStream::output_fd()); | |
| 1166 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1167 // skip atexit/vm_exit/vm_abort hooks | |
| 1168 os::die(); | |
| 1169 } | |
| 1170 | |
| 1171 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1172 // ShowMessageBoxOnError when it is ready to abort. | |
| 1173 os::sleep(this, 5 * 1000, false); | |
| 1174 } | |
| 1175 } | |
| 1176 | |
| 1177 PeriodicTask::real_time_tick(time_to_wait); | |
| 1178 | |
| 1179 // If we have no more tasks left due to dynamic disenrollment, | |
| 1180 // shut down the thread since we don't currently support dynamic enrollment | |
| 1181 if (PeriodicTask::num_tasks() == 0) { | |
| 1182 _should_terminate = true; | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 // Signal that it is terminated | |
| 1187 { | |
| 1188 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1189 _watcher_thread = NULL; | |
| 1190 Terminator_lock->notify(); | |
| 1191 } | |
| 1192 | |
| 1193 // Thread destructor usually does this.. | |
| 1194 ThreadLocalStorage::set_thread(NULL); | |
| 1195 } | |
| 1196 | |
| 1197 void WatcherThread::start() { | |
| 1198 if (watcher_thread() == NULL) { | |
| 1199 _should_terminate = false; | |
| 1200 // Create the single instance of WatcherThread | |
| 1201 new WatcherThread(); | |
| 1202 } | |
| 1203 } | |
| 1204 | |
| 1205 void WatcherThread::stop() { | |
| 1206 // it is ok to take late safepoints here, if needed | |
| 1207 MutexLocker mu(Terminator_lock); | |
| 1208 _should_terminate = true; | |
|
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1209 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1210 |
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1211 Thread* watcher = watcher_thread(); |
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1212 if (watcher != NULL) |
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1213 watcher->_SleepEvent->unpark(); |
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1214 |
| 0 | 1215 while(watcher_thread() != NULL) { |
| 1216 // This wait should make safepoint checks, wait without a timeout, | |
| 1217 // and wait as a suspend-equivalent condition. | |
| 1218 // | |
| 1219 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1220 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1221 // FlatProfiler task, is waiting for the external suspend request on | |
| 1222 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1223 // eventually timeout, but that takes time. Making this wait a | |
| 1224 // suspend-equivalent condition solves that timeout problem. | |
| 1225 // | |
| 1226 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1227 Mutex::_as_suspend_equivalent_flag); | |
| 1228 } | |
| 1229 } | |
| 1230 | |
| 1231 void WatcherThread::print_on(outputStream* st) const { | |
| 1232 st->print("\"%s\" ", name()); | |
| 1233 Thread::print_on(st); | |
| 1234 st->cr(); | |
| 1235 } | |
| 1236 | |
| 1237 // ======= JavaThread ======== | |
| 1238 | |
| 1239 // A JavaThread is a normal Java thread | |
| 1240 | |
| 1241 void JavaThread::initialize() { | |
| 1242 // Initialize fields | |
|
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1243 |
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1244 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1245 set_claimed_par_id(-1); |
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1246 |
| 0 | 1247 set_saved_exception_pc(NULL); |
| 1248 set_threadObj(NULL); | |
| 1249 _anchor.clear(); | |
| 1250 set_entry_point(NULL); | |
| 1251 set_jni_functions(jni_functions()); | |
| 1252 set_callee_target(NULL); | |
| 1253 set_vm_result(NULL); | |
| 1254 set_vm_result_2(NULL); | |
| 1255 set_vframe_array_head(NULL); | |
| 1256 set_vframe_array_last(NULL); | |
| 1257 set_deferred_locals(NULL); | |
| 1258 set_deopt_mark(NULL); | |
|
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1259 set_deopt_nmethod(NULL); |
| 0 | 1260 clear_must_deopt_id(); |
| 1261 set_monitor_chunks(NULL); | |
| 1262 set_next(NULL); | |
| 1263 set_thread_state(_thread_new); | |
| 1264 _terminated = _not_terminated; | |
| 1265 _privileged_stack_top = NULL; | |
| 1266 _array_for_gc = NULL; | |
| 1267 _suspend_equivalent = false; | |
| 1268 _in_deopt_handler = 0; | |
| 1269 _doing_unsafe_access = false; | |
| 1270 _stack_guard_state = stack_guard_unused; | |
| 1271 _exception_oop = NULL; | |
| 1272 _exception_pc = 0; | |
| 1273 _exception_handler_pc = 0; | |
| 1274 _exception_stack_size = 0; | |
| 1903 | 1275 _is_method_handle_return = 0; |
| 0 | 1276 _jvmti_thread_state= NULL; |
|
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1277 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1278 _jvmti_get_loaded_classes_closure = NULL; |
| 1279 _interp_only_mode = 0; | |
| 1280 _special_runtime_exit_condition = _no_async_condition; | |
| 1281 _pending_async_exception = NULL; | |
| 1282 _is_compiling = false; | |
| 1283 _thread_stat = NULL; | |
| 1284 _thread_stat = new ThreadStatistics(); | |
| 1285 _blocked_on_compilation = false; | |
| 1286 _jni_active_critical = 0; | |
| 1287 _do_not_unlock_if_synchronized = false; | |
| 1288 _cached_monitor_info = NULL; | |
| 1289 _parker = Parker::Allocate(this) ; | |
| 1290 | |
| 1291 #ifndef PRODUCT | |
| 1292 _jmp_ring_index = 0; | |
| 1293 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1294 record_jump(NULL, NULL, NULL, 0); | |
| 1295 } | |
| 1296 #endif /* PRODUCT */ | |
| 1297 | |
| 1298 set_thread_profiler(NULL); | |
| 1299 if (FlatProfiler::is_active()) { | |
| 1300 // This is where we would decide to either give each thread it's own profiler | |
| 1301 // or use one global one from FlatProfiler, | |
| 1302 // or up to some count of the number of profiled threads, etc. | |
| 1303 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1304 pp->engage(); | |
| 1305 set_thread_profiler(pp); | |
| 1306 } | |
| 1307 | |
| 1308 // Setup safepoint state info for this thread | |
| 1309 ThreadSafepointState::create(this); | |
| 1310 | |
| 1311 debug_only(_java_call_counter = 0); | |
| 1312 | |
| 1313 // JVMTI PopFrame support | |
| 1314 _popframe_condition = popframe_inactive; | |
| 1315 _popframe_preserved_args = NULL; | |
| 1316 _popframe_preserved_args_size = 0; | |
| 1317 | |
| 1318 pd_initialize(); | |
| 1319 } | |
| 1320 | |
|
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1321 #ifndef SERIALGC |
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1322 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1323 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1324 #endif // !SERIALGC |
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1325 |
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1326 JavaThread::JavaThread(bool is_attaching) : |
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1327 Thread() |
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1328 #ifndef SERIALGC |
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1329 , _satb_mark_queue(&_satb_mark_queue_set), |
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1330 _dirty_card_queue(&_dirty_card_queue_set) |
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1331 #endif // !SERIALGC |
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1332 { |
| 0 | 1333 initialize(); |
| 1334 _is_attaching = is_attaching; | |
|
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1335 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 0 | 1336 } |
| 1337 | |
| 1338 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1339 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1340 return true; // Stack already guarded or guard pages not needed. | |
| 1341 } | |
| 1342 | |
| 1343 if (register_stack_overflow()) { | |
| 1344 // For those architectures which have separate register and | |
| 1345 // memory stacks, we must check the register stack to see if | |
| 1346 // it has overflowed. | |
| 1347 return false; | |
| 1348 } | |
| 1349 | |
| 1350 // Java code never executes within the yellow zone: the latter is only | |
| 1351 // there to provoke an exception during stack banging. If java code | |
| 1352 // is executing there, either StackShadowPages should be larger, or | |
| 1353 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1354 // when it should. | |
| 1355 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1356 | |
| 1357 enable_stack_yellow_zone(); | |
| 1358 return true; | |
| 1359 } | |
| 1360 | |
| 1361 bool JavaThread::reguard_stack(void) { | |
| 1362 return reguard_stack(os::current_stack_pointer()); | |
| 1363 } | |
| 1364 | |
| 1365 | |
| 1366 void JavaThread::block_if_vm_exited() { | |
| 1367 if (_terminated == _vm_exited) { | |
| 1368 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1369 // we will block here forever | |
| 1370 Threads_lock->lock_without_safepoint_check(); | |
| 1371 ShouldNotReachHere(); | |
| 1372 } | |
| 1373 } | |
| 1374 | |
| 1375 | |
| 1376 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1377 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1378 | |
|
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1379 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1380 Thread() |
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1381 #ifndef SERIALGC |
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1382 , _satb_mark_queue(&_satb_mark_queue_set), |
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1383 _dirty_card_queue(&_dirty_card_queue_set) |
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1384 #endif // !SERIALGC |
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1385 { |
| 0 | 1386 if (TraceThreadEvents) { |
| 1387 tty->print_cr("creating thread %p", this); | |
| 1388 } | |
| 1389 initialize(); | |
| 1390 _is_attaching = false; | |
| 1391 set_entry_point(entry_point); | |
| 1392 // Create the native thread itself. | |
| 1393 // %note runtime_23 | |
| 1394 os::ThreadType thr_type = os::java_thread; | |
| 1395 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1396 os::java_thread; | |
| 1397 os::create_thread(this, thr_type, stack_sz); | |
| 1398 | |
| 1399 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1400 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1401 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1402 // the exception consists of creating the exception object & initializing it, initialization | |
| 1403 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1404 // | |
| 1405 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1406 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1407 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1408 // object must be fully initialized (take a look at JVM_Start) | |
| 1409 } | |
| 1410 | |
| 1411 JavaThread::~JavaThread() { | |
| 1412 if (TraceThreadEvents) { | |
| 1413 tty->print_cr("terminate thread %p", this); | |
| 1414 } | |
| 1415 | |
| 1416 // JSR166 -- return the parker to the free list | |
| 1417 Parker::Release(_parker); | |
| 1418 _parker = NULL ; | |
| 1419 | |
| 1420 // Free any remaining previous UnrollBlock | |
| 1421 vframeArray* old_array = vframe_array_last(); | |
| 1422 | |
| 1423 if (old_array != NULL) { | |
| 1424 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1425 old_array->set_unroll_block(NULL); | |
| 1426 delete old_info; | |
| 1427 delete old_array; | |
| 1428 } | |
| 1429 | |
| 1430 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1431 if (deferred != NULL) { | |
| 1432 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1433 assert(deferred->length() != 0, "empty array!"); | |
| 1434 do { | |
| 1435 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1436 deferred->remove_at(0); | |
| 1437 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1438 delete dlv; | |
| 1439 } while (deferred->length() != 0); | |
| 1440 delete deferred; | |
| 1441 } | |
| 1442 | |
| 1443 // All Java related clean up happens in exit | |
| 1444 ThreadSafepointState::destroy(this); | |
| 1445 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1446 if (_thread_stat != NULL) delete _thread_stat; | |
| 1447 } | |
| 1448 | |
| 1449 | |
| 1450 // The first routine called by a new Java thread | |
| 1451 void JavaThread::run() { | |
| 1452 // initialize thread-local alloc buffer related fields | |
| 1453 this->initialize_tlab(); | |
| 1454 | |
| 1455 // used to test validitity of stack trace backs | |
| 1456 this->record_base_of_stack_pointer(); | |
| 1457 | |
| 1458 // Record real stack base and size. | |
| 1459 this->record_stack_base_and_size(); | |
| 1460 | |
| 1461 // Initialize thread local storage; set before calling MutexLocker | |
| 1462 this->initialize_thread_local_storage(); | |
| 1463 | |
| 1464 this->create_stack_guard_pages(); | |
| 1465 | |
|
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1466 this->cache_global_variables(); |
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1467 |
| 0 | 1468 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1469 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1470 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1471 | |
| 1472 assert(JavaThread::current() == this, "sanity check"); | |
| 1473 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1474 | |
| 1475 DTRACE_THREAD_PROBE(start, this); | |
| 1476 | |
| 1477 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1478 // been completed. | |
| 1479 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1480 | |
| 1481 if (JvmtiExport::should_post_thread_life()) { | |
| 1482 JvmtiExport::post_thread_start(this); | |
| 1483 } | |
| 1484 | |
| 1485 // We call another function to do the rest so we are sure that the stack addresses used | |
| 1486 // from there will be lower than the stack base just computed | |
| 1487 thread_main_inner(); | |
| 1488 | |
| 1489 // Note, thread is no longer valid at this point! | |
| 1490 } | |
| 1491 | |
| 1492 | |
| 1493 void JavaThread::thread_main_inner() { | |
| 1494 assert(JavaThread::current() == this, "sanity check"); | |
| 1495 assert(this->threadObj() != NULL, "just checking"); | |
| 1496 | |
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1497 // Execute thread entry point unless this thread has a pending exception |
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1498 // or has been stopped before starting. |
| 0 | 1499 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1500 if (!this->has_pending_exception() && |
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1501 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 0 | 1502 HandleMark hm(this); |
| 1503 this->entry_point()(this, this); | |
| 1504 } | |
| 1505 | |
| 1506 DTRACE_THREAD_PROBE(stop, this); | |
| 1507 | |
| 1508 this->exit(false); | |
| 1509 delete this; | |
| 1510 } | |
| 1511 | |
| 1512 | |
| 1513 static void ensure_join(JavaThread* thread) { | |
| 1514 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1515 Handle threadObj(thread, thread->threadObj()); | |
| 1516 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1517 ObjectLocker lock(threadObj, thread); | |
| 1518 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1519 thread->clear_pending_exception(); | |
| 1520 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1521 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1522 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1523 // to complete once we've done the notify_all below |
| 0 | 1524 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1525 lock.notify_all(thread); | |
| 1526 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1527 thread->clear_pending_exception(); | |
| 1528 } | |
| 1529 | |
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1530 |
| 0 | 1531 // For any new cleanup additions, please check to see if they need to be applied to |
| 1532 // cleanup_failed_attach_current_thread as well. | |
| 1533 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1534 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1535 if (!InitializeJavaLangSystem) return; | |
| 1536 | |
| 1537 HandleMark hm(this); | |
| 1538 Handle uncaught_exception(this, this->pending_exception()); | |
| 1539 this->clear_pending_exception(); | |
| 1540 Handle threadObj(this, this->threadObj()); | |
| 1541 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1542 | |
| 1543 if (get_thread_profiler() != NULL) { | |
| 1544 get_thread_profiler()->disengage(); | |
| 1545 ResourceMark rm; | |
| 1546 get_thread_profiler()->print(get_thread_name()); | |
| 1547 } | |
| 1548 | |
| 1549 | |
| 1550 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1551 { | |
| 1552 EXCEPTION_MARK; | |
| 1553 | |
| 1554 CLEAR_PENDING_EXCEPTION; | |
| 1555 } | |
| 1556 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1557 // has to be fixed by a runtime query method | |
| 1558 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1559 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1560 // java.lang.Thread.dispatchUncaughtException | |
| 1561 if (uncaught_exception.not_null()) { | |
| 1562 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1563 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
| 1564 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
| 1565 { | |
| 1566 EXCEPTION_MARK; | |
| 1567 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1568 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1569 // so call ThreadGroup.uncaughtException() | |
| 1570 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1571 CallInfo callinfo; | |
| 1142 | 1572 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1573 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1574 vmSymbols::dispatchUncaughtException_name(), |
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1575 vmSymbols::throwable_void_signature(), |
| 0 | 1576 KlassHandle(), false, false, THREAD); |
| 1577 CLEAR_PENDING_EXCEPTION; | |
| 1578 methodHandle method = callinfo.selected_method(); | |
| 1579 if (method.not_null()) { | |
| 1580 JavaValue result(T_VOID); | |
| 1581 JavaCalls::call_virtual(&result, | |
| 1582 threadObj, thread_klass, | |
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1583 vmSymbols::dispatchUncaughtException_name(), |
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1584 vmSymbols::throwable_void_signature(), |
| 0 | 1585 uncaught_exception, |
| 1586 THREAD); | |
| 1587 } else { | |
| 1142 | 1588 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1589 JavaValue result(T_VOID); |
| 1590 JavaCalls::call_virtual(&result, | |
| 1591 group, thread_group, | |
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1592 vmSymbols::uncaughtException_name(), |
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1593 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1594 threadObj, // Arg 1 |
| 1595 uncaught_exception, // Arg 2 | |
| 1596 THREAD); | |
| 1597 } | |
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1598 if (HAS_PENDING_EXCEPTION) { |
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1599 ResourceMark rm(this); |
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1600 jio_fprintf(defaultStream::error_stream(), |
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1601 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1602 " in thread \"%s\"\n", |
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1603 Klass::cast(pending_exception()->klass())->external_name(), |
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1604 get_thread_name()); |
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1605 CLEAR_PENDING_EXCEPTION; |
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1606 } |
| 0 | 1607 } |
| 1608 } | |
| 1609 | |
| 1610 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
| 1611 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1612 // is deprecated anyhow. | |
| 1613 { int count = 3; | |
| 1614 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1615 EXCEPTION_MARK; | |
| 1616 JavaValue result(T_VOID); | |
| 1142 | 1617 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1618 JavaCalls::call_virtual(&result, |
| 1619 threadObj, thread_klass, | |
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1620 vmSymbols::exit_method_name(), |
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1621 vmSymbols::void_method_signature(), |
| 0 | 1622 THREAD); |
| 1623 CLEAR_PENDING_EXCEPTION; | |
| 1624 } | |
| 1625 } | |
| 1626 | |
| 1627 // notify JVMTI | |
| 1628 if (JvmtiExport::should_post_thread_life()) { | |
| 1629 JvmtiExport::post_thread_end(this); | |
| 1630 } | |
| 1631 | |
| 1632 // We have notified the agents that we are exiting, before we go on, | |
| 1633 // we must check for a pending external suspend request and honor it | |
| 1634 // in order to not surprise the thread that made the suspend request. | |
| 1635 while (true) { | |
| 1636 { | |
| 1637 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1638 if (!is_external_suspend()) { | |
| 1639 set_terminated(_thread_exiting); | |
| 1640 ThreadService::current_thread_exiting(this); | |
| 1641 break; | |
| 1642 } | |
| 1643 // Implied else: | |
| 1644 // Things get a little tricky here. We have a pending external | |
| 1645 // suspend request, but we are holding the SR_lock so we | |
| 1646 // can't just self-suspend. So we temporarily drop the lock | |
| 1647 // and then self-suspend. | |
| 1648 } | |
| 1649 | |
| 1650 ThreadBlockInVM tbivm(this); | |
| 1651 java_suspend_self(); | |
| 1652 | |
| 1653 // We're done with this suspend request, but we have to loop around | |
| 1654 // and check again. Eventually we will get SR_lock without a pending | |
| 1655 // external suspend request and will be able to mark ourselves as | |
| 1656 // exiting. | |
| 1657 } | |
| 1658 // no more external suspends are allowed at this point | |
| 1659 } else { | |
| 1660 // before_exit() has already posted JVMTI THREAD_END events | |
| 1661 } | |
| 1662 | |
| 1663 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1664 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1665 // group should have the destroyed bit set before waiters are notified). | |
| 1666 ensure_join(this); | |
| 1667 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1668 | |
| 1669 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1670 // held by this thread must be released. A detach operation must only | |
| 1671 // get here if there are no Java frames on the stack. Therefore, any | |
| 1672 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1673 // pre-inflated and in the monitor cache. | |
| 1674 // | |
| 1675 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1676 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1677 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1678 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1679 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1680 } | |
| 1681 | |
| 1682 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1683 // is in a consistent state, in case GC happens | |
| 1684 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1685 | |
| 1686 if (active_handles() != NULL) { | |
| 1687 JNIHandleBlock* block = active_handles(); | |
| 1688 set_active_handles(NULL); | |
| 1689 JNIHandleBlock::release_block(block); | |
| 1690 } | |
| 1691 | |
| 1692 if (free_handle_block() != NULL) { | |
| 1693 JNIHandleBlock* block = free_handle_block(); | |
| 1694 set_free_handle_block(NULL); | |
| 1695 JNIHandleBlock::release_block(block); | |
| 1696 } | |
| 1697 | |
| 1698 // These have to be removed while this is still a valid thread. | |
| 1699 remove_stack_guard_pages(); | |
| 1700 | |
| 1701 if (UseTLAB) { | |
| 1702 tlab().make_parsable(true); // retire TLAB | |
| 1703 } | |
| 1704 | |
|
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1705 if (JvmtiEnv::environments_might_exist()) { |
|
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1706 JvmtiExport::cleanup_thread(this); |
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1707 } |
|
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1708 |
|
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1709 #ifndef SERIALGC |
|
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1710 // We must flush G1-related buffers before removing a thread from |
|
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1711 // the list of active threads. |
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1712 if (UseG1GC) { |
|
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1713 flush_barrier_queues(); |
|
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1714 } |
|
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1715 #endif |
|
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1716 |
| 0 | 1717 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1718 Threads::remove(this); | |
| 1719 } | |
| 1720 | |
|
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1721 #ifndef SERIALGC |
|
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1722 // Flush G1-related queues. |
|
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1723 void JavaThread::flush_barrier_queues() { |
|
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|
1724 satb_mark_queue().flush(); |
|
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1725 dirty_card_queue().flush(); |
|
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1726 } |
|
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1727 |
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|
1728 void JavaThread::initialize_queues() { |
|
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1729 assert(!SafepointSynchronize::is_at_safepoint(), |
|
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1730 "we should not be at a safepoint"); |
|
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1731 |
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1732 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1733 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
|
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1734 // The SATB queue should have been constructed with its active |
|
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1735 // field set to false. |
|
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1736 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
|
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|
1737 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
|
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1738 // If we are creating the thread during a marking cycle, we should |
|
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1739 // set the active field of the SATB queue to true. |
|
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1740 if (satb_queue_set.is_active()) { |
|
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|
1741 satb_queue.set_active(true); |
|
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1742 } |
|
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1743 |
|
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|
1744 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
|
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1745 // The dirty card queue should have been constructed with its |
|
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1746 // active field set to true. |
|
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|
1747 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
|
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1748 } |
|
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1749 #endif // !SERIALGC |
|
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1750 |
| 0 | 1751 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1752 if (get_thread_profiler() != NULL) { |
|
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|
1753 get_thread_profiler()->disengage(); |
|
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1754 ResourceMark rm; |
|
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|
1755 get_thread_profiler()->print(get_thread_name()); |
|
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1756 } |
|
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1757 |
|
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1758 if (active_handles() != NULL) { |
|
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1759 JNIHandleBlock* block = active_handles(); |
|
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1760 set_active_handles(NULL); |
|
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1761 JNIHandleBlock::release_block(block); |
|
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1762 } |
|
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1763 |
|
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1764 if (free_handle_block() != NULL) { |
|
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1765 JNIHandleBlock* block = free_handle_block(); |
|
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1766 set_free_handle_block(NULL); |
|
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1767 JNIHandleBlock::release_block(block); |
|
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|
1768 } |
|
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1769 |
|
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1770 // These have to be removed while this is still a valid thread. |
|
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1771 remove_stack_guard_pages(); |
|
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1772 |
|
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1773 if (UseTLAB) { |
|
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1774 tlab().make_parsable(true); // retire TLAB, if any |
|
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|
1775 } |
|
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1776 |
|
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|
1777 #ifndef SERIALGC |
|
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1778 if (UseG1GC) { |
|
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|
1779 flush_barrier_queues(); |
|
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1780 } |
|
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|
1781 #endif |
|
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1782 |
|
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|
1783 Threads::remove(this); |
|
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|
1784 delete this; |
| 0 | 1785 } |
| 1786 | |
| 1787 | |
|
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1788 |
|
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1789 |
| 0 | 1790 JavaThread* JavaThread::active() { |
| 1791 Thread* thread = ThreadLocalStorage::thread(); | |
| 1792 assert(thread != NULL, "just checking"); | |
| 1793 if (thread->is_Java_thread()) { | |
| 1794 return (JavaThread*) thread; | |
| 1795 } else { | |
| 1796 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1797 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1798 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1799 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1800 return ret; | |
| 1801 } | |
| 1802 } | |
| 1803 | |
| 1804 bool JavaThread::is_lock_owned(address adr) const { | |
|
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|
1805 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1806 |
| 1807 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1808 if (chunk->contains(adr)) return true; | |
| 1809 } | |
| 1810 | |
| 1811 return false; | |
| 1812 } | |
| 1813 | |
| 1814 | |
| 1815 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1816 chunk->set_next(monitor_chunks()); | |
| 1817 set_monitor_chunks(chunk); | |
| 1818 } | |
| 1819 | |
| 1820 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1821 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1822 if (monitor_chunks() == chunk) { | |
| 1823 set_monitor_chunks(chunk->next()); | |
| 1824 } else { | |
| 1825 MonitorChunk* prev = monitor_chunks(); | |
| 1826 while (prev->next() != chunk) prev = prev->next(); | |
| 1827 prev->set_next(chunk->next()); | |
| 1828 } | |
| 1829 } | |
| 1830 | |
| 1831 // JVM support. | |
| 1832 | |
| 1833 // Note: this function shouldn't block if it's called in | |
| 1834 // _thread_in_native_trans state (such as from | |
| 1835 // check_special_condition_for_native_trans()). | |
| 1836 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1837 | |
| 1838 if (has_last_Java_frame() && has_async_condition()) { | |
| 1839 // If we are at a polling page safepoint (not a poll return) | |
| 1840 // then we must defer async exception because live registers | |
| 1841 // will be clobbered by the exception path. Poll return is | |
| 1842 // ok because the call we a returning from already collides | |
| 1843 // with exception handling registers and so there is no issue. | |
| 1844 // (The exception handling path kills call result registers but | |
| 1845 // this is ok since the exception kills the result anyway). | |
| 1846 | |
| 1847 if (is_at_poll_safepoint()) { | |
| 1848 // if the code we are returning to has deoptimized we must defer | |
| 1849 // the exception otherwise live registers get clobbered on the | |
| 1850 // exception path before deoptimization is able to retrieve them. | |
| 1851 // | |
| 1852 RegisterMap map(this, false); | |
| 1853 frame caller_fr = last_frame().sender(&map); | |
| 1854 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1855 if (caller_fr.is_deoptimized_frame()) { | |
| 1856 if (TraceExceptions) { | |
| 1857 ResourceMark rm; | |
| 1858 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1859 } | |
| 1860 return; | |
| 1861 } | |
| 1862 } | |
| 1863 } | |
| 1864 | |
| 1865 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1866 if (condition == _no_async_condition) { | |
| 1867 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1868 // was called: | |
| 1869 // - if we were here only because of an external suspend request, | |
| 1870 // then that was taken care of above (or cancelled) so we are done | |
| 1871 // - if we were here because of another async request, then it has | |
| 1872 // been cleared between the has_special_runtime_exit_condition() | |
| 1873 // and now so again we are done | |
| 1874 return; | |
| 1875 } | |
| 1876 | |
| 1877 // Check for pending async. exception | |
| 1878 if (_pending_async_exception != NULL) { | |
| 1879 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 1880 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1881 |
| 1882 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1883 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1884 | |
| 1885 if (TraceExceptions) { | |
| 1886 ResourceMark rm; | |
| 1887 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1888 if (has_last_Java_frame() ) { | |
| 1889 frame f = last_frame(); | |
| 1890 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1891 } | |
| 1892 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1893 } | |
| 1894 _pending_async_exception = NULL; | |
| 1895 clear_has_async_exception(); | |
| 1896 } | |
| 1897 } | |
| 1898 | |
| 1899 if (check_unsafe_error && | |
| 1900 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1901 condition = _no_async_condition; // done | |
| 1902 switch (thread_state()) { | |
| 1903 case _thread_in_vm: | |
| 1904 { | |
| 1905 JavaThread* THREAD = this; | |
| 1906 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1907 } | |
| 1908 case _thread_in_native: | |
| 1909 { | |
| 1910 ThreadInVMfromNative tiv(this); | |
| 1911 JavaThread* THREAD = this; | |
| 1912 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1913 } | |
| 1914 case _thread_in_Java: | |
| 1915 { | |
| 1916 ThreadInVMfromJava tiv(this); | |
| 1917 JavaThread* THREAD = this; | |
| 1918 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1919 } | |
| 1920 default: | |
| 1921 ShouldNotReachHere(); | |
| 1922 } | |
| 1923 } | |
| 1924 | |
| 1925 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1926 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1927 "must have handled the async condition, if no exception"); | |
| 1928 } | |
| 1929 | |
| 1930 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1931 // | |
| 1932 // Check for pending external suspend. Internal suspend requests do | |
| 1933 // not use handle_special_runtime_exit_condition(). | |
| 1934 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1935 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1936 // threads could call into the VM with another thread's JNIEnv so we | |
| 1937 // can be here operating on behalf of a suspended thread (4432884). | |
| 1938 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1939 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1940 // | |
| 1941 // Because thread is external suspended the safepoint code will count | |
| 1942 // thread as at a safepoint. This can be odd because we can be here | |
| 1943 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 1944 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 1945 // before calling java_suspend_self like all other callers of it but | |
| 1946 // we must then observe proper safepoint protocol. (We can't leave | |
| 1947 // _thread_blocked with a safepoint in progress). However we can be | |
| 1948 // here as _thread_in_native_trans so we can't use a normal transition | |
| 1949 // constructor/destructor pair because they assert on that type of | |
| 1950 // transition. We could do something like: | |
| 1951 // | |
| 1952 // JavaThreadState state = thread_state(); | |
| 1953 // set_thread_state(_thread_in_vm); | |
| 1954 // { | |
| 1955 // ThreadBlockInVM tbivm(this); | |
| 1956 // java_suspend_self() | |
| 1957 // } | |
| 1958 // set_thread_state(_thread_in_vm_trans); | |
| 1959 // if (safepoint) block; | |
| 1960 // set_thread_state(state); | |
| 1961 // | |
| 1962 // but that is pretty messy. Instead we just go with the way the | |
| 1963 // code has worked before and note that this is the only path to | |
| 1964 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 1965 // mode. | |
| 1966 | |
| 1967 frame_anchor()->make_walkable(this); | |
| 1968 java_suspend_self(); | |
| 1969 | |
| 1970 // We might be here for reasons in addition to the self-suspend request | |
| 1971 // so check for other async requests. | |
| 1972 } | |
| 1973 | |
| 1974 if (check_asyncs) { | |
| 1975 check_and_handle_async_exceptions(); | |
| 1976 } | |
| 1977 } | |
| 1978 | |
| 1979 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 1980 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 1981 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 1982 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 1983 | |
| 1984 // Do not throw asynchronous exceptions against the compiler thread | |
| 1985 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 1986 if (is_Compiler_thread()) return; | |
| 1987 | |
| 1988 { | |
| 1989 // Actually throw the Throwable against the target Thread - however | |
| 1990 // only if there is no thread death exception installed already. | |
| 1142 | 1991 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1992 // If the topmost frame is a runtime stub, then we are calling into |
| 1993 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 1994 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 1995 // may not be valid | |
| 1996 if (has_last_Java_frame()) { | |
| 1997 frame f = last_frame(); | |
| 1998 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 1999 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2000 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2001 frame compiled_frame = f.sender(®_map); | |
| 2002 if (compiled_frame.can_be_deoptimized()) { | |
| 2003 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2004 } | |
| 2005 } | |
| 2006 } | |
| 2007 | |
| 2008 // Set async. pending exception in thread. | |
| 2009 set_pending_async_exception(java_throwable); | |
| 2010 | |
| 2011 if (TraceExceptions) { | |
| 2012 ResourceMark rm; | |
| 2013 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 2014 } | |
| 2015 // for AbortVMOnException flag | |
| 2016 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 2017 } | |
| 2018 } | |
| 2019 | |
| 2020 | |
| 2021 // Interrupt thread so it will wake up from a potential wait() | |
| 2022 Thread::interrupt(this); | |
| 2023 } | |
| 2024 | |
| 2025 // External suspension mechanism. | |
| 2026 // | |
| 2027 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2028 // to any VM_locks and it is at a transition | |
| 2029 // Self-suspension will happen on the transition out of the vm. | |
| 2030 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2031 // | |
| 2032 // Guarantees on return: | |
| 2033 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2034 // force a safepoint) | |
| 2035 // + Target thread will not enter any new monitors | |
| 2036 // | |
| 2037 void JavaThread::java_suspend() { | |
| 2038 { MutexLocker mu(Threads_lock); | |
| 2039 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2040 return; | |
| 2041 } | |
| 2042 } | |
| 2043 | |
| 2044 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2045 if (!is_external_suspend()) { | |
| 2046 // a racing resume has cancelled us; bail out now | |
| 2047 return; | |
| 2048 } | |
| 2049 | |
| 2050 // suspend is done | |
| 2051 uint32_t debug_bits = 0; | |
| 2052 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2053 // SR_lock to allow the thread to reach a stable thread state if | |
| 2054 // it is currently in a transient thread state. | |
| 2055 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2056 SuspendRetryDelay, &debug_bits) ) { | |
| 2057 return; | |
| 2058 } | |
| 2059 } | |
| 2060 | |
| 2061 VM_ForceSafepoint vm_suspend; | |
| 2062 VMThread::execute(&vm_suspend); | |
| 2063 } | |
| 2064 | |
| 2065 // Part II of external suspension. | |
| 2066 // A JavaThread self suspends when it detects a pending external suspend | |
| 2067 // request. This is usually on transitions. It is also done in places | |
| 2068 // where continuing to the next transition would surprise the caller, | |
| 2069 // e.g., monitor entry. | |
| 2070 // | |
| 2071 // Returns the number of times that the thread self-suspended. | |
| 2072 // | |
| 2073 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2074 // thread. java_suspend_self() is the second stage of cooperative | |
| 2075 // suspension for external suspend requests and should only be used | |
| 2076 // to complete an external suspend request. | |
| 2077 // | |
| 2078 int JavaThread::java_suspend_self() { | |
| 2079 int ret = 0; | |
| 2080 | |
| 2081 // we are in the process of exiting so don't suspend | |
| 2082 if (is_exiting()) { | |
| 2083 clear_external_suspend(); | |
| 2084 return ret; | |
| 2085 } | |
| 2086 | |
| 2087 assert(_anchor.walkable() || | |
| 2088 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2089 "must have walkable stack"); | |
| 2090 | |
| 2091 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2092 | |
| 979 | 2093 assert(!this->is_ext_suspended(), |
| 0 | 2094 "a thread trying to self-suspend should not already be suspended"); |
| 2095 | |
| 2096 if (this->is_suspend_equivalent()) { | |
| 2097 // If we are self-suspending as a result of the lifting of a | |
| 2098 // suspend equivalent condition, then the suspend_equivalent | |
| 2099 // flag is not cleared until we set the ext_suspended flag so | |
| 2100 // that wait_for_ext_suspend_completion() returns consistent | |
| 2101 // results. | |
| 2102 this->clear_suspend_equivalent(); | |
| 2103 } | |
| 2104 | |
| 2105 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2106 // above. Or another external suspend request could be waiting for us | |
| 2107 // by the time we return from SR_lock()->wait(). The thread | |
| 2108 // that requested the suspension may already be trying to walk our | |
| 2109 // stack and if we return now, we can change the stack out from under | |
| 2110 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2111 // to crash. We stay self-suspended until there are no more pending | |
| 2112 // external suspend requests. | |
| 2113 while (is_external_suspend()) { | |
| 2114 ret++; | |
| 2115 this->set_ext_suspended(); | |
| 2116 | |
| 2117 // _ext_suspended flag is cleared by java_resume() | |
| 2118 while (is_ext_suspended()) { | |
| 2119 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2120 } | |
| 2121 } | |
| 2122 | |
| 2123 return ret; | |
| 2124 } | |
| 2125 | |
| 2126 #ifdef ASSERT | |
| 2127 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2128 // hence doesn't need protection from concurrent access at this stage | |
| 2129 void JavaThread::verify_not_published() { | |
| 2130 if (!Threads_lock->owned_by_self()) { | |
| 2131 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2132 assert( !Threads::includes(this), | |
| 2133 "java thread shouldn't have been published yet!"); | |
| 2134 } | |
| 2135 else { | |
| 2136 assert( !Threads::includes(this), | |
| 2137 "java thread shouldn't have been published yet!"); | |
| 2138 } | |
| 2139 } | |
| 2140 #endif | |
| 2141 | |
| 2142 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2143 // progress or when _suspend_flags is non-zero. | |
| 2144 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2145 // block if a safepoint is in progress. | |
| 2146 // Async exception ISN'T checked. | |
| 2147 // Note only the ThreadInVMfromNative transition can call this function | |
| 2148 // directly and when thread state is _thread_in_native_trans | |
| 2149 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2150 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2151 | |
| 2152 JavaThread *curJT = JavaThread::current(); | |
| 2153 bool do_self_suspend = thread->is_external_suspend(); | |
| 2154 | |
| 2155 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2156 | |
| 2157 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2158 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2159 // threads could call into the VM with another thread's JNIEnv so we | |
| 2160 // can be here operating on behalf of a suspended thread (4432884). | |
| 2161 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2162 JavaThreadState state = thread->thread_state(); | |
| 2163 | |
| 2164 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2165 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2166 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2167 thread->set_suspend_equivalent(); | |
| 2168 | |
| 2169 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2170 // wait until the thread changes to other thread state. There is no | |
| 2171 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2172 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2173 // too long. Temporarily change the state to _thread_blocked to | |
| 2174 // let the VM thread know that this thread is ready for GC. The problem | |
| 2175 // of changing thread state is that safepoint could happen just after | |
| 2176 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2177 // see the _thread_blocked state. We must check for safepoint | |
| 2178 // after restoring the state and make sure we won't leave while a safepoint | |
| 2179 // is in progress. | |
| 2180 thread->set_thread_state(_thread_blocked); | |
| 2181 thread->java_suspend_self(); | |
| 2182 thread->set_thread_state(state); | |
| 2183 // Make sure new state is seen by VM thread | |
| 2184 if (os::is_MP()) { | |
| 2185 if (UseMembar) { | |
| 2186 // Force a fence between the write above and read below | |
| 2187 OrderAccess::fence(); | |
| 2188 } else { | |
| 2189 // Must use this rather than serialization page in particular on Windows | |
| 2190 InterfaceSupport::serialize_memory(thread); | |
| 2191 } | |
| 2192 } | |
| 2193 } | |
| 2194 | |
| 2195 if (SafepointSynchronize::do_call_back()) { | |
| 2196 // If we are safepointing, then block the caller which may not be | |
| 2197 // the same as the target thread (see above). | |
| 2198 SafepointSynchronize::block(curJT); | |
| 2199 } | |
| 2200 | |
| 2201 if (thread->is_deopt_suspend()) { | |
| 2202 thread->clear_deopt_suspend(); | |
| 2203 RegisterMap map(thread, false); | |
| 2204 frame f = thread->last_frame(); | |
| 2205 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2206 f = f.sender(&map); | |
| 2207 } | |
| 2208 if (f.id() == thread->must_deopt_id()) { | |
| 2209 thread->clear_must_deopt_id(); | |
|
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|
2210 f.deoptimize(thread); |
| 0 | 2211 } else { |
| 2212 fatal("missed deoptimization!"); | |
| 2213 } | |
| 2214 } | |
| 2215 } | |
| 2216 | |
| 2217 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2218 // progress or when _suspend_flags is non-zero. | |
| 2219 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2220 // block if a safepoint is in progress. | |
| 2221 // Also check for pending async exception (not including unsafe access error). | |
| 2222 // Note only the native==>VM/Java barriers can call this function and when | |
| 2223 // thread state is _thread_in_native_trans. | |
| 2224 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2225 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2226 | |
| 2227 if (thread->has_async_exception()) { | |
| 2228 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2229 // access error since that may block. | |
| 2230 thread->check_and_handle_async_exceptions(false); | |
| 2231 } | |
| 2232 } | |
| 2233 | |
| 2234 // We need to guarantee the Threads_lock here, since resumes are not | |
| 2235 // allowed during safepoint synchronization | |
| 2236 // Can only resume from an external suspension | |
| 2237 void JavaThread::java_resume() { | |
| 2238 assert_locked_or_safepoint(Threads_lock); | |
| 2239 | |
| 2240 // Sanity check: thread is gone, has started exiting or the thread | |
| 2241 // was not externally suspended. | |
| 2242 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2243 return; | |
| 2244 } | |
| 2245 | |
| 2246 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2247 | |
| 2248 clear_external_suspend(); | |
| 2249 | |
| 2250 if (is_ext_suspended()) { | |
| 2251 clear_ext_suspended(); | |
| 2252 SR_lock()->notify_all(); | |
| 2253 } | |
| 2254 } | |
| 2255 | |
| 2256 void JavaThread::create_stack_guard_pages() { | |
| 2257 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2258 address low_addr = stack_base() - stack_size(); | |
| 2259 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2260 | |
| 2261 int allocate = os::allocate_stack_guard_pages(); | |
| 2262 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2263 | |
|
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|
2264 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2265 warning("Attempt to allocate stack guard pages failed."); |
| 2266 return; | |
| 2267 } | |
| 2268 | |
| 2269 if (os::guard_memory((char *) low_addr, len)) { | |
| 2270 _stack_guard_state = stack_guard_enabled; | |
| 2271 } else { | |
| 2272 warning("Attempt to protect stack guard pages failed."); | |
| 2273 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2274 warning("Attempt to deallocate stack guard pages failed."); | |
| 2275 } | |
| 2276 } | |
| 2277 } | |
| 2278 | |
| 2279 void JavaThread::remove_stack_guard_pages() { | |
| 2280 if (_stack_guard_state == stack_guard_unused) return; | |
| 2281 address low_addr = stack_base() - stack_size(); | |
| 2282 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2283 | |
| 2284 if (os::allocate_stack_guard_pages()) { | |
|
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|
2285 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2286 _stack_guard_state = stack_guard_unused; |
| 2287 } else { | |
| 2288 warning("Attempt to deallocate stack guard pages failed."); | |
| 2289 } | |
| 2290 } else { | |
| 2291 if (_stack_guard_state == stack_guard_unused) return; | |
| 2292 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2293 _stack_guard_state = stack_guard_unused; | |
| 2294 } else { | |
| 2295 warning("Attempt to unprotect stack guard pages failed."); | |
| 2296 } | |
| 2297 } | |
| 2298 } | |
| 2299 | |
| 2300 void JavaThread::enable_stack_yellow_zone() { | |
| 2301 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2302 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2303 | |
| 2304 // The base notation is from the stacks point of view, growing downward. | |
| 2305 // We need to adjust it to work correctly with guard_memory() | |
| 2306 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2307 | |
| 2308 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2309 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2310 | |
| 2311 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2312 _stack_guard_state = stack_guard_enabled; | |
| 2313 } else { | |
| 2314 warning("Attempt to guard stack yellow zone failed."); | |
| 2315 } | |
| 2316 enable_register_stack_guard(); | |
| 2317 } | |
| 2318 | |
| 2319 void JavaThread::disable_stack_yellow_zone() { | |
| 2320 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2321 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2322 | |
| 2323 // Simply return if called for a thread that does not use guard pages. | |
| 2324 if (_stack_guard_state == stack_guard_unused) return; | |
| 2325 | |
| 2326 // The base notation is from the stacks point of view, growing downward. | |
| 2327 // We need to adjust it to work correctly with guard_memory() | |
| 2328 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2329 | |
| 2330 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2331 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2332 } else { | |
| 2333 warning("Attempt to unguard stack yellow zone failed."); | |
| 2334 } | |
| 2335 disable_register_stack_guard(); | |
| 2336 } | |
| 2337 | |
| 2338 void JavaThread::enable_stack_red_zone() { | |
| 2339 // The base notation is from the stacks point of view, growing downward. | |
| 2340 // We need to adjust it to work correctly with guard_memory() | |
| 2341 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2342 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2343 | |
| 2344 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2345 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2346 | |
| 2347 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2348 warning("Attempt to guard stack red zone failed."); | |
| 2349 } | |
| 2350 } | |
| 2351 | |
| 2352 void JavaThread::disable_stack_red_zone() { | |
| 2353 // The base notation is from the stacks point of view, growing downward. | |
| 2354 // We need to adjust it to work correctly with guard_memory() | |
| 2355 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2356 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2357 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2358 warning("Attempt to unguard stack red zone failed."); | |
| 2359 } | |
| 2360 } | |
| 2361 | |
| 2362 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2363 // ignore is there is no stack | |
| 2364 if (!has_last_Java_frame()) return; | |
| 2365 // traverse the stack frames. Starts from top frame. | |
| 2366 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2367 frame* fr = fst.current(); | |
| 2368 f(fr, fst.register_map()); | |
| 2369 } | |
| 2370 } | |
| 2371 | |
| 2372 | |
| 2373 #ifndef PRODUCT | |
| 2374 // Deoptimization | |
| 2375 // Function for testing deoptimization | |
| 2376 void JavaThread::deoptimize() { | |
| 2377 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2378 StackFrameStream fst(this, UseBiasedLocking); | |
| 2379 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2380 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2381 // Iterate over all frames in the thread and deoptimize | |
| 2382 for(; !fst.is_done(); fst.next()) { | |
| 2383 if(fst.current()->can_be_deoptimized()) { | |
| 2384 | |
| 2385 if (only_at) { | |
| 2386 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2387 // consists of comma or carriage return separated numbers so | |
| 2388 // search for the current bci in that string. | |
| 2389 address pc = fst.current()->pc(); | |
| 2390 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2391 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2392 char buffer[8]; | |
| 2393 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2394 size_t len = strlen(buffer); | |
| 2395 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2396 while (found != NULL) { | |
| 2397 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2398 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2399 // Check that the bci found is bracketed by terminators. | |
| 2400 break; | |
| 2401 } | |
| 2402 found = strstr(found + 1, buffer); | |
| 2403 } | |
| 2404 if (!found) { | |
| 2405 continue; | |
| 2406 } | |
| 2407 } | |
| 2408 | |
| 2409 if (DebugDeoptimization && !deopt) { | |
| 2410 deopt = true; // One-time only print before deopt | |
| 2411 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2412 trace_frames(); | |
| 2413 trace_stack(); | |
| 2414 } | |
| 2415 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2416 } | |
| 2417 } | |
| 2418 | |
| 2419 if (DebugDeoptimization && deopt) { | |
| 2420 tty->print_cr("[AFTER Deoptimization]"); | |
| 2421 trace_frames(); | |
| 2422 } | |
| 2423 } | |
| 2424 | |
| 2425 | |
| 2426 // Make zombies | |
| 2427 void JavaThread::make_zombies() { | |
| 2428 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2429 if (fst.current()->can_be_deoptimized()) { | |
| 2430 // it is a Java nmethod | |
| 2431 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2432 nm->make_not_entrant(); | |
| 2433 } | |
| 2434 } | |
| 2435 } | |
| 2436 #endif // PRODUCT | |
| 2437 | |
| 2438 | |
| 2439 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2440 if (!has_last_Java_frame()) return; | |
| 2441 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2442 StackFrameStream fst(this, UseBiasedLocking); | |
| 2443 for(; !fst.is_done(); fst.next()) { | |
| 2444 if (fst.current()->should_be_deoptimized()) { | |
| 2445 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2446 } | |
| 2447 } | |
| 2448 } | |
| 2449 | |
| 2450 | |
| 2451 // GC support | |
| 2452 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2453 | |
| 2454 void JavaThread::gc_epilogue() { | |
| 2455 frames_do(frame_gc_epilogue); | |
| 2456 } | |
| 2457 | |
| 2458 | |
| 2459 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2460 | |
| 2461 void JavaThread::gc_prologue() { | |
| 2462 frames_do(frame_gc_prologue); | |
| 2463 } | |
| 2464 | |
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2465 // If the caller is a NamedThread, then remember, in the current scope, |
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2466 // the given JavaThread in its _processed_thread field. |
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2467 class RememberProcessedThread: public StackObj { |
|
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2468 NamedThread* _cur_thr; |
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2469 public: |
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2470 RememberProcessedThread(JavaThread* jthr) { |
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2471 Thread* thread = Thread::current(); |
|
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2472 if (thread->is_Named_thread()) { |
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2473 _cur_thr = (NamedThread *)thread; |
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2474 _cur_thr->set_processed_thread(jthr); |
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2475 } else { |
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2476 _cur_thr = NULL; |
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2477 } |
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2478 } |
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2479 |
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2480 ~RememberProcessedThread() { |
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2481 if (_cur_thr) { |
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2482 _cur_thr->set_processed_thread(NULL); |
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2483 } |
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2484 } |
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2485 }; |
| 0 | 2486 |
|
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2487 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2488 // Verify that the deferred card marks have been flushed. |
| 2489 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2490 |
| 0 | 2491 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2492 // since there may be more than one thread using each ThreadProfiler. | |
| 2493 | |
| 2494 // Traverse the GCHandles | |
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2495 Thread::oops_do(f, cf); |
| 0 | 2496 |
| 2497 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2498 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2499 | |
| 2500 if (has_last_Java_frame()) { | |
|
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2501 // Record JavaThread to GC thread |
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2502 RememberProcessedThread rpt(this); |
| 0 | 2503 |
| 2504 // Traverse the privileged stack | |
| 2505 if (_privileged_stack_top != NULL) { | |
| 2506 _privileged_stack_top->oops_do(f); | |
| 2507 } | |
| 2508 | |
| 2509 // traverse the registered growable array | |
| 2510 if (_array_for_gc != NULL) { | |
| 2511 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2512 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2513 } | |
| 2514 } | |
| 2515 | |
| 2516 // Traverse the monitor chunks | |
| 2517 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2518 chunk->oops_do(f); | |
| 2519 } | |
| 2520 | |
| 2521 // Traverse the execution stack | |
| 2522 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2523 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2524 } |
| 2525 } | |
| 2526 | |
| 2527 // callee_target is never live across a gc point so NULL it here should | |
| 2528 // it still contain a methdOop. | |
| 2529 | |
| 2530 set_callee_target(NULL); | |
| 2531 | |
| 2532 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2533 // If we have deferred set_locals there might be oops waiting to be | |
| 2534 // written | |
| 2535 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2536 if (list != NULL) { | |
| 2537 for (int i = 0; i < list->length(); i++) { | |
| 2538 list->at(i)->oops_do(f); | |
| 2539 } | |
| 2540 } | |
| 2541 | |
| 2542 // Traverse instance variables at the end since the GC may be moving things | |
| 2543 // around using this function | |
| 2544 f->do_oop((oop*) &_threadObj); | |
| 2545 f->do_oop((oop*) &_vm_result); | |
| 2546 f->do_oop((oop*) &_vm_result_2); | |
| 2547 f->do_oop((oop*) &_exception_oop); | |
| 2548 f->do_oop((oop*) &_pending_async_exception); | |
| 2549 | |
| 2550 if (jvmti_thread_state() != NULL) { | |
| 2551 jvmti_thread_state()->oops_do(f); | |
| 2552 } | |
| 2553 } | |
| 2554 | |
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2555 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2556 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2557 |
| 2558 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2559 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2560 | |
| 2561 if (has_last_Java_frame()) { | |
| 2562 // Traverse the execution stack | |
| 2563 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2564 fst.current()->nmethods_do(cf); |
| 0 | 2565 } |
| 2566 } | |
| 2567 } | |
| 2568 | |
| 2569 // Printing | |
| 2570 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2571 switch (_thread_state) { | |
| 2572 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2573 case _thread_new: return "_thread_new"; | |
| 2574 case _thread_new_trans: return "_thread_new_trans"; | |
| 2575 case _thread_in_native: return "_thread_in_native"; | |
| 2576 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2577 case _thread_in_vm: return "_thread_in_vm"; | |
| 2578 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2579 case _thread_in_Java: return "_thread_in_Java"; | |
| 2580 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2581 case _thread_blocked: return "_thread_blocked"; | |
| 2582 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2583 default: return "unknown thread state"; | |
| 2584 } | |
| 2585 } | |
| 2586 | |
| 2587 #ifndef PRODUCT | |
| 2588 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2589 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2590 }; | |
| 2591 void JavaThread::print_thread_state() const { | |
| 2592 print_thread_state_on(tty); | |
| 2593 }; | |
| 2594 #endif // PRODUCT | |
| 2595 | |
| 2596 // Called by Threads::print() for VM_PrintThreads operation | |
| 2597 void JavaThread::print_on(outputStream *st) const { | |
| 2598 st->print("\"%s\" ", get_thread_name()); | |
| 2599 oop thread_oop = threadObj(); | |
| 2600 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2601 Thread::print_on(st); | |
| 2602 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2603 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2604 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2605 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2606 } | |
| 2607 #ifndef PRODUCT | |
| 2608 print_thread_state_on(st); | |
| 2609 _safepoint_state->print_on(st); | |
| 2610 #endif // PRODUCT | |
| 2611 } | |
| 2612 | |
| 2613 // Called by fatal error handler. The difference between this and | |
| 2614 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2615 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2616 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2617 oop thread_obj = threadObj(); | |
| 2618 if (thread_obj != NULL) { | |
| 2619 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2620 } | |
| 2621 st->print(" ["); | |
| 2622 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2623 if (osthread()) { | |
| 2624 st->print(", id=%d", osthread()->thread_id()); | |
| 2625 } | |
| 2626 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2627 _stack_base - _stack_size, _stack_base); | |
| 2628 st->print("]"); | |
| 2629 return; | |
| 2630 } | |
| 2631 | |
| 2632 // Verification | |
| 2633 | |
| 2634 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2635 | |
| 2636 void JavaThread::verify() { | |
| 2637 // Verify oops in the thread. | |
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2638 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2639 |
| 2640 // Verify the stack frames. | |
| 2641 frames_do(frame_verify); | |
| 2642 } | |
| 2643 | |
| 2644 // CR 6300358 (sub-CR 2137150) | |
| 2645 // Most callers of this method assume that it can't return NULL but a | |
| 2646 // thread may not have a name whilst it is in the process of attaching to | |
| 2647 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2648 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2649 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2650 // for such that this method never returns NULL. | |
| 2651 const char* JavaThread::get_thread_name() const { | |
| 2652 #ifdef ASSERT | |
| 2653 // early safepoints can hit while current thread does not yet have TLS | |
| 2654 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2655 Thread *cur = Thread::current(); | |
| 2656 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2657 // Current JavaThreads are allowed to get their own name without | |
| 2658 // the Threads_lock. | |
| 2659 assert_locked_or_safepoint(Threads_lock); | |
| 2660 } | |
| 2661 } | |
| 2662 #endif // ASSERT | |
| 2663 return get_thread_name_string(); | |
| 2664 } | |
| 2665 | |
| 2666 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2667 // descriptive string if there is no set name | |
| 2668 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2669 const char* name_str; | |
| 2670 oop thread_obj = threadObj(); | |
| 2671 if (thread_obj != NULL) { | |
| 2672 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2673 if (name != NULL) { | |
| 2674 if (buf == NULL) { | |
| 2675 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2676 } | |
| 2677 else { | |
| 2678 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2679 } | |
| 2680 } | |
| 2681 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
| 2682 name_str = "<no-name - thread is attaching>"; | |
| 2683 } | |
| 2684 else { | |
| 2685 name_str = Thread::name(); | |
| 2686 } | |
| 2687 } | |
| 2688 else { | |
| 2689 name_str = Thread::name(); | |
| 2690 } | |
| 2691 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2692 return name_str; | |
| 2693 } | |
| 2694 | |
| 2695 | |
| 2696 const char* JavaThread::get_threadgroup_name() const { | |
| 2697 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2698 oop thread_obj = threadObj(); | |
| 2699 if (thread_obj != NULL) { | |
| 2700 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2701 if (thread_group != NULL) { | |
| 2702 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2703 // ThreadGroup.name can be null | |
| 2704 if (name != NULL) { | |
| 2705 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2706 return str; | |
| 2707 } | |
| 2708 } | |
| 2709 } | |
| 2710 return NULL; | |
| 2711 } | |
| 2712 | |
| 2713 const char* JavaThread::get_parent_name() const { | |
| 2714 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2715 oop thread_obj = threadObj(); | |
| 2716 if (thread_obj != NULL) { | |
| 2717 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2718 if (thread_group != NULL) { | |
| 2719 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2720 if (parent != NULL) { | |
| 2721 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2722 // ThreadGroup.name can be null | |
| 2723 if (name != NULL) { | |
| 2724 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2725 return str; | |
| 2726 } | |
| 2727 } | |
| 2728 } | |
| 2729 } | |
| 2730 return NULL; | |
| 2731 } | |
| 2732 | |
| 2733 ThreadPriority JavaThread::java_priority() const { | |
| 2734 oop thr_oop = threadObj(); | |
| 2735 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2736 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2737 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2738 return priority; | |
| 2739 } | |
| 2740 | |
| 2741 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2742 | |
| 2743 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2744 // Link Java Thread object <-> C++ Thread | |
| 2745 | |
| 2746 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2747 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2748 // be used to pass the C++ thread object to other methods. | |
| 2749 | |
| 2750 // Set the Java level thread object (jthread) field of the | |
| 2751 // new thread (a JavaThread *) to C++ thread object using the | |
| 2752 // "thread_oop" handle. | |
| 2753 | |
| 2754 // Set the thread field (a JavaThread *) of the | |
| 2755 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2756 | |
| 2757 Handle thread_oop(Thread::current(), | |
| 2758 JNIHandles::resolve_non_null(jni_thread)); | |
| 2759 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2760 "must be initialized"); | |
| 2761 set_threadObj(thread_oop()); | |
| 2762 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2763 | |
| 2764 if (prio == NoPriority) { | |
| 2765 prio = java_lang_Thread::priority(thread_oop()); | |
| 2766 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2767 } | |
| 2768 | |
| 2769 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2770 Thread::set_priority(this, prio); | |
| 2771 | |
| 2772 // Add the new thread to the Threads list and set it in motion. | |
| 2773 // We must have threads lock in order to call Threads::add. | |
| 2774 // It is crucial that we do not block before the thread is | |
| 2775 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2776 // will not be visited by GC. | |
| 2777 Threads::add(this); | |
| 2778 } | |
| 2779 | |
| 2780 oop JavaThread::current_park_blocker() { | |
| 2781 // Support for JSR-166 locks | |
| 2782 oop thread_oop = threadObj(); | |
| 242 | 2783 if (thread_oop != NULL && |
| 2784 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2785 return java_lang_Thread::park_blocker(thread_oop); |
| 2786 } | |
| 2787 return NULL; | |
| 2788 } | |
| 2789 | |
| 2790 | |
| 2791 void JavaThread::print_stack_on(outputStream* st) { | |
| 2792 if (!has_last_Java_frame()) return; | |
| 2793 ResourceMark rm; | |
| 2794 HandleMark hm; | |
| 2795 | |
| 2796 RegisterMap reg_map(this); | |
| 2797 vframe* start_vf = last_java_vframe(®_map); | |
| 2798 int count = 0; | |
| 2799 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2800 if (f->is_java_frame()) { | |
| 2801 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2802 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2803 | |
| 2804 // Print out lock information | |
| 2805 if (JavaMonitorsInStackTrace) { | |
| 2806 jvf->print_lock_info_on(st, count); | |
| 2807 } | |
| 2808 } else { | |
| 2809 // Ignore non-Java frames | |
| 2810 } | |
| 2811 | |
| 2812 // Bail-out case for too deep stacks | |
| 2813 count++; | |
| 2814 if (MaxJavaStackTraceDepth == count) return; | |
| 2815 } | |
| 2816 } | |
| 2817 | |
| 2818 | |
| 2819 // JVMTI PopFrame support | |
| 2820 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2821 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2822 if (in_bytes(size_in_bytes) != 0) { | |
| 2823 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2824 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
|
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2825 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2826 } |
| 2827 } | |
| 2828 | |
| 2829 void* JavaThread::popframe_preserved_args() { | |
| 2830 return _popframe_preserved_args; | |
| 2831 } | |
| 2832 | |
| 2833 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2834 return in_ByteSize(_popframe_preserved_args_size); | |
| 2835 } | |
| 2836 | |
| 2837 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2838 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2839 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2840 return in_WordSize(sz / wordSize); | |
| 2841 } | |
| 2842 | |
| 2843 void JavaThread::popframe_free_preserved_args() { | |
| 2844 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2845 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2846 _popframe_preserved_args = NULL; | |
| 2847 _popframe_preserved_args_size = 0; | |
| 2848 } | |
| 2849 | |
| 2850 #ifndef PRODUCT | |
| 2851 | |
| 2852 void JavaThread::trace_frames() { | |
| 2853 tty->print_cr("[Describe stack]"); | |
| 2854 int frame_no = 1; | |
| 2855 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2856 tty->print(" %d. ", frame_no++); | |
| 2857 fst.current()->print_value_on(tty,this); | |
| 2858 tty->cr(); | |
| 2859 } | |
| 2860 } | |
| 2861 | |
| 2862 | |
| 2863 void JavaThread::trace_stack_from(vframe* start_vf) { | |
| 2864 ResourceMark rm; | |
| 2865 int vframe_no = 1; | |
| 2866 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2867 if (f->is_java_frame()) { | |
| 2868 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 2869 } else { | |
| 2870 f->print(); | |
| 2871 } | |
| 2872 if (vframe_no > StackPrintLimit) { | |
| 2873 tty->print_cr("...<more frames>..."); | |
| 2874 return; | |
| 2875 } | |
| 2876 } | |
| 2877 } | |
| 2878 | |
| 2879 | |
| 2880 void JavaThread::trace_stack() { | |
| 2881 if (!has_last_Java_frame()) return; | |
| 2882 ResourceMark rm; | |
| 2883 HandleMark hm; | |
| 2884 RegisterMap reg_map(this); | |
| 2885 trace_stack_from(last_java_vframe(®_map)); | |
| 2886 } | |
| 2887 | |
| 2888 | |
| 2889 #endif // PRODUCT | |
| 2890 | |
| 2891 | |
| 2892 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 2893 assert(reg_map != NULL, "a map must be given"); | |
| 2894 frame f = last_frame(); | |
| 2895 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 2896 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 2897 } | |
| 2898 return NULL; | |
| 2899 } | |
| 2900 | |
| 2901 | |
| 2902 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 2903 vframeStream vfst(this); | |
| 2904 vfst.security_get_caller_frame(depth); | |
| 2905 if (!vfst.at_end()) { | |
| 2906 return vfst.method()->method_holder(); | |
| 2907 } | |
| 2908 return NULL; | |
| 2909 } | |
| 2910 | |
| 2911 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 2912 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 2913 CompileBroker::compiler_thread_loop(); | |
| 2914 } | |
| 2915 | |
| 2916 // Create a CompilerThread | |
| 2917 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 2918 : JavaThread(&compiler_thread_entry) { | |
| 2919 _env = NULL; | |
| 2920 _log = NULL; | |
| 2921 _task = NULL; | |
| 2922 _queue = queue; | |
| 2923 _counters = counters; | |
| 1584 | 2924 _buffer_blob = NULL; |
| 0 | 2925 |
| 2926 #ifndef PRODUCT | |
| 2927 _ideal_graph_printer = NULL; | |
| 2928 #endif | |
| 2929 } | |
| 2930 | |
| 2931 | |
| 2932 // ======= Threads ======== | |
| 2933 | |
| 2934 // The Threads class links together all active threads, and provides | |
| 2935 // operations over all threads. It is protected by its own Mutex | |
| 2936 // lock, which is also used in other contexts to protect thread | |
| 2937 // operations from having the thread being operated on from exiting | |
| 2938 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 2939 | |
| 2940 JavaThread* Threads::_thread_list = NULL; | |
| 2941 int Threads::_number_of_threads = 0; | |
| 2942 int Threads::_number_of_non_daemon_threads = 0; | |
| 2943 int Threads::_return_code = 0; | |
| 2944 size_t JavaThread::_stack_size_at_create = 0; | |
| 2945 | |
| 2946 // All JavaThreads | |
| 2947 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 2948 | |
| 2949 void os_stream(); | |
| 2950 | |
| 2951 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 2952 void Threads::threads_do(ThreadClosure* tc) { | |
| 2953 assert_locked_or_safepoint(Threads_lock); | |
| 2954 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 2955 ALL_JAVA_THREADS(p) { | |
| 2956 tc->do_thread(p); | |
| 2957 } | |
| 2958 // Someday we could have a table or list of all non-JavaThreads. | |
| 2959 // For now, just manually iterate through them. | |
| 2960 tc->do_thread(VMThread::vm_thread()); | |
| 2961 Universe::heap()->gc_threads_do(tc); | |
|
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2962 WatcherThread *wt = WatcherThread::watcher_thread(); |
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2963 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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2964 // the data for WatcherThread is still valid upon being examined. However, |
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2965 // considering that WatchThread terminates when the VM is on the way to |
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2966 // exit at safepoint, the chance of the above is extremely small. The right |
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2967 // way to prevent termination of WatcherThread would be to acquire |
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2968 // Terminator_lock, but we can't do that without violating the lock rank |
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2969 // checking in some cases. |
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2970 if (wt != NULL) |
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2971 tc->do_thread(wt); |
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2972 |
| 0 | 2973 // If CompilerThreads ever become non-JavaThreads, add them here |
| 2974 } | |
| 2975 | |
| 2976 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 2977 | |
| 242 | 2978 extern void JDK_Version_init(); |
| 2979 | |
| 0 | 2980 // Check version |
| 2981 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 2982 | |
| 2983 // Initialize the output stream module | |
| 2984 ostream_init(); | |
| 2985 | |
| 2986 // Process java launcher properties. | |
| 2987 Arguments::process_sun_java_launcher_properties(args); | |
| 2988 | |
| 2989 // Initialize the os module before using TLS | |
| 2990 os::init(); | |
| 2991 | |
| 2992 // Initialize system properties. | |
| 2993 Arguments::init_system_properties(); | |
| 2994 | |
| 242 | 2995 // So that JDK version can be used as a discrimintor when parsing arguments |
| 2996 JDK_Version_init(); | |
| 2997 | |
|
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2998 // Update/Initialize System properties after JDK version number is known |
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2999 Arguments::init_version_specific_system_properties(); |
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|
3000 |
| 0 | 3001 // Parse arguments |
| 3002 jint parse_result = Arguments::parse(args); | |
| 3003 if (parse_result != JNI_OK) return parse_result; | |
| 3004 | |
| 3005 if (PauseAtStartup) { | |
| 3006 os::pause(); | |
| 3007 } | |
| 3008 | |
| 3009 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
| 3010 | |
| 3011 // Record VM creation timing statistics | |
| 3012 TraceVmCreationTime create_vm_timer; | |
| 3013 create_vm_timer.start(); | |
| 3014 | |
| 3015 // Timing (must come after argument parsing) | |
| 3016 TraceTime timer("Create VM", TraceStartupTime); | |
| 3017 | |
| 3018 // Initialize the os module after parsing the args | |
| 3019 jint os_init_2_result = os::init_2(); | |
| 3020 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3021 | |
| 3022 // Initialize output stream logging | |
| 3023 ostream_init_log(); | |
| 3024 | |
| 3025 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3026 // Must be before create_vm_init_agents() | |
| 3027 if (Arguments::init_libraries_at_startup()) { | |
| 3028 convert_vm_init_libraries_to_agents(); | |
| 3029 } | |
| 3030 | |
| 3031 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3032 if (Arguments::init_agents_at_startup()) { | |
| 3033 create_vm_init_agents(); | |
| 3034 } | |
| 3035 | |
| 3036 // Initialize Threads state | |
| 3037 _thread_list = NULL; | |
| 3038 _number_of_threads = 0; | |
| 3039 _number_of_non_daemon_threads = 0; | |
| 3040 | |
| 3041 // Initialize TLS | |
| 3042 ThreadLocalStorage::init(); | |
| 3043 | |
| 3044 // Initialize global data structures and create system classes in heap | |
| 3045 vm_init_globals(); | |
| 3046 | |
| 3047 // Attach the main thread to this os thread | |
| 3048 JavaThread* main_thread = new JavaThread(); | |
| 3049 main_thread->set_thread_state(_thread_in_vm); | |
| 3050 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3051 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3052 // change the stack size recorded here to one based on the java thread | |
| 3053 // stacksize. This adjusted size is what is used to figure the placement | |
| 3054 // of the guard pages. | |
| 3055 main_thread->record_stack_base_and_size(); | |
| 3056 main_thread->initialize_thread_local_storage(); | |
| 3057 | |
| 3058 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3059 | |
| 3060 if (!main_thread->set_as_starting_thread()) { | |
| 3061 vm_shutdown_during_initialization( | |
| 3062 "Failed necessary internal allocation. Out of swap space"); | |
| 3063 delete main_thread; | |
| 3064 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3065 return JNI_ENOMEM; | |
| 3066 } | |
| 3067 | |
| 3068 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3069 // crash Linux VM, see notes in os_linux.cpp. | |
| 3070 main_thread->create_stack_guard_pages(); | |
| 3071 | |
| 1878 | 3072 // Initialize Java-Level synchronization subsystem |
| 3073 ObjectMonitor::Initialize() ; | |
| 0 | 3074 |
| 3075 // Initialize global modules | |
| 3076 jint status = init_globals(); | |
| 3077 if (status != JNI_OK) { | |
| 3078 delete main_thread; | |
| 3079 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3080 return status; | |
| 3081 } | |
| 3082 | |
|
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3083 // Should be done after the heap is fully created |
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3084 main_thread->cache_global_variables(); |
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3085 |
| 0 | 3086 HandleMark hm; |
| 3087 | |
| 3088 { MutexLocker mu(Threads_lock); | |
| 3089 Threads::add(main_thread); | |
| 3090 } | |
| 3091 | |
| 3092 // Any JVMTI raw monitors entered in onload will transition into | |
| 3093 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3094 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3095 | |
| 3096 if (VerifyBeforeGC && | |
| 3097 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3098 Universe::heap()->prepare_for_verify(); | |
| 3099 Universe::verify(); // make sure we're starting with a clean slate | |
| 3100 } | |
| 3101 | |
| 3102 // Create the VMThread | |
| 3103 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3104 VMThread::create(); | |
| 3105 Thread* vmthread = VMThread::vm_thread(); | |
| 3106 | |
| 3107 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3108 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3109 | |
| 3110 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3111 // Monitors can have spurious returns, must always check another state flag | |
| 3112 { | |
| 3113 MutexLocker ml(Notify_lock); | |
| 3114 os::start_thread(vmthread); | |
| 3115 while (vmthread->active_handles() == NULL) { | |
| 3116 Notify_lock->wait(); | |
| 3117 } | |
| 3118 } | |
| 3119 } | |
| 3120 | |
| 3121 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3122 EXCEPTION_MARK; | |
| 3123 | |
| 3124 // At this point, the Universe is initialized, but we have not executed | |
| 3125 // any byte code. Now is a good time (the only time) to dump out the | |
| 3126 // internal state of the JVM for sharing. | |
| 3127 | |
| 3128 if (DumpSharedSpaces) { | |
| 3129 Universe::heap()->preload_and_dump(CHECK_0); | |
| 3130 ShouldNotReachHere(); | |
| 3131 } | |
| 3132 | |
| 3133 // Always call even when there are not JVMTI environments yet, since environments | |
| 3134 // may be attached late and JVMTI must track phases of VM execution | |
| 3135 JvmtiExport::enter_start_phase(); | |
| 3136 | |
| 3137 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3138 JvmtiExport::post_vm_start(); | |
| 3139 | |
| 3140 { | |
| 3141 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3142 | |
| 3143 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3144 create_vm_init_libraries(); | |
| 3145 } | |
| 3146 | |
| 3147 if (InitializeJavaLangString) { | |
|
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3148 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3149 } else { |
| 3150 warning("java.lang.String not initialized"); | |
| 3151 } | |
| 3152 | |
|
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3153 if (AggressiveOpts) { |
|
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3154 { |
|
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3155 // Forcibly initialize java/util/HashMap and mutate the private |
|
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3156 // static final "frontCacheEnabled" field before we start creating instances |
|
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3157 #ifdef ASSERT |
|
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3158 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
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3159 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
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3160 #endif |
|
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3161 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
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3162 KlassHandle k = KlassHandle(THREAD, k_o); |
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3163 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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3164 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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3165 ik->initialize(CHECK_0); |
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3166 fieldDescriptor fd; |
|
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3167 // Possible we might not find this field; if so, don't break |
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changeset
|
3168 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
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parents:
2302
diff
changeset
|
3169 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3170 } |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3171 } |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3172 |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3173 if (UseStringCache) { |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3174 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3175 // static final "stringCacheEnabled" field before we start creating instances |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3176 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3177 // Possible that StringValue isn't present: if so, silently don't break |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3178 if (k_o != NULL) { |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3179 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3180 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3181 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3182 fieldDescriptor fd; |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3183 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3184 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2302
diff
changeset
|
3185 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3186 } |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3187 } |
|
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3188 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3189 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3190 |
| 0 | 3191 // Initialize java_lang.System (needed before creating the thread) |
| 3192 if (InitializeJavaLangSystem) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3193 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3194 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3195 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3196 Universe::set_main_thread_group(thread_group()); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3197 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3198 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3199 main_thread->set_threadObj(thread_object); | |
| 3200 // Set thread status to running since main thread has | |
| 3201 // been started and running. | |
| 3202 java_lang_Thread::set_thread_status(thread_object, | |
| 3203 java_lang_Thread::RUNNABLE); | |
| 3204 | |
| 3205 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3206 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3207 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3208 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3209 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3210 call_initializeSystemClass(CHECK_0); |
| 3211 } else { | |
| 3212 warning("java.lang.System not initialized"); | |
| 3213 } | |
| 3214 | |
| 3215 // an instance of OutOfMemory exception has been allocated earlier | |
| 3216 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3217 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3218 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3219 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3220 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3221 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3222 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3223 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
| 0 | 3224 } else { |
| 3225 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3226 warning("java.lang.NullPointerException has not been initialized"); | |
| 3227 warning("java.lang.ClassCastException has not been initialized"); | |
| 3228 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3229 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3230 warning("java.lang.StackOverflowError has not been initialized"); | |
| 3231 } | |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3232 } |
| 0 | 3233 |
| 3234 // See : bugid 4211085. | |
| 3235 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3236 // property"java.compiler" and read & write property "java.vm.info". | |
| 3237 // When a security manager is installed through the command line | |
| 3238 // option "-Djava.security.manager", the above properties are not | |
| 3239 // readable and the static initializer for java.lang.Compiler fails | |
| 3240 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3241 // user code which calls methods in java.lang.Compiler. | |
| 3242 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3243 // system domains are on the stack when the properties are read. | |
| 3244 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3245 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3246 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3247 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3248 // Once that is done, we should remove this hack. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3249 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3250 |
| 3251 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3252 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3253 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3254 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3255 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3256 reset_vm_info_property(CHECK_0); | |
| 3257 | |
| 3258 quicken_jni_functions(); | |
| 3259 | |
| 3260 // Set flag that basic initialization has completed. Used by exceptions and various | |
| 3261 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3262 set_init_completed(); | |
| 3263 | |
| 3264 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
| 3265 | |
| 3266 // record VM initialization completion time | |
| 3267 Management::record_vm_init_completed(); | |
| 3268 | |
| 3269 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3270 // valid exceptions may be thrown in the process. | |
| 3271 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3272 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3273 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3274 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3275 if (HAS_PENDING_EXCEPTION) { | |
| 3276 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3277 } | |
| 3278 | |
| 3279 #ifndef SERIALGC | |
| 3280 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3281 // and better encapsulated. The ugly nested if test would go away |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3282 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3283 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3284 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3285 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3286 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3287 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3288 } |
| 0 | 3289 if (HAS_PENDING_EXCEPTION) { |
| 3290 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3291 } | |
| 3292 } | |
| 3293 #endif // SERIALGC | |
| 3294 | |
| 3295 // Always call even when there are not JVMTI environments yet, since environments | |
| 3296 // may be attached late and JVMTI must track phases of VM execution | |
| 3297 JvmtiExport::enter_live_phase(); | |
| 3298 | |
| 3299 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3300 os::signal_init(); | |
| 3301 | |
| 3302 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3303 if (!DisableAttachMechanism) { | |
| 3304 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3305 AttachListener::init(); | |
| 3306 } | |
| 3307 } | |
| 3308 | |
| 3309 // Launch -Xrun agents | |
| 3310 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3311 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3312 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3313 create_vm_init_libraries(); | |
| 3314 } | |
| 3315 | |
| 3316 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
| 3317 JvmtiExport::post_vm_initialized(); | |
| 3318 | |
| 3319 Chunk::start_chunk_pool_cleaner_task(); | |
| 3320 | |
| 3321 // initialize compiler(s) | |
| 3322 CompileBroker::compilation_init(); | |
| 3323 | |
| 3324 Management::initialize(THREAD); | |
| 3325 if (HAS_PENDING_EXCEPTION) { | |
| 3326 // management agent fails to start possibly due to | |
| 3327 // configuration problem and is responsible for printing | |
| 3328 // stack trace if appropriate. Simply exit VM. | |
| 3329 vm_exit(1); | |
| 3330 } | |
| 3331 | |
| 3332 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3333 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3334 if (MemProfiling) MemProfiler::engage(); | |
| 3335 StatSampler::engage(); | |
| 3336 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3337 | |
| 3338 BiasedLocking::init(); | |
| 3339 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3340 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
|
3341 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3342 // 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
|
3343 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3344 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3345 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3346 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3347 } |
| 0 | 3348 |
| 3349 // Start up the WatcherThread if there are any periodic tasks | |
| 3350 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3351 // aren't, late joiners might appear to start slowly (we might | |
| 3352 // take a while to process their first tick). | |
| 3353 if (PeriodicTask::num_tasks() > 0) { | |
| 3354 WatcherThread::start(); | |
| 3355 } | |
| 3356 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3357 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3358 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3359 |
| 0 | 3360 create_vm_timer.end(); |
| 3361 return JNI_OK; | |
| 3362 } | |
| 3363 | |
| 3364 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3365 extern "C" { | |
| 3366 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3367 } | |
| 3368 // Find a command line agent library and return its entry point for | |
| 3369 // -agentlib: -agentpath: -Xrun | |
| 3370 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3371 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3372 OnLoadEntry_t on_load_entry = NULL; | |
| 3373 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3374 | |
| 3375 if (library == NULL) { | |
| 3376 char buffer[JVM_MAXPATHLEN]; | |
| 3377 char ebuf[1024]; | |
| 3378 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
|
3379 const char *msg = "Could not find agent library "; |
| 0 | 3380 |
| 3381 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3382 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3383 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3384 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
|
3385 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
|
3386 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
|
3387 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3388 // 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
|
3389 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
|
3390 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3391 } |
| 3392 } else { | |
| 3393 // 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
|
3394 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
|
3395 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3396 #ifdef KERNEL |
| 3397 // Download instrument dll | |
| 3398 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3399 char *props = Arguments::get_kernel_properties(); | |
| 3400 char *home = Arguments::get_java_home(); | |
| 3401 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3402 " 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
|
3403 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
|
3404 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
| 0 | 3405 jio_snprintf(cmd, length, fmt, home, props); |
| 3406 int status = os::fork_and_exec(cmd); | |
| 3407 FreeHeap(props); | |
| 3408 if (status == -1) { | |
| 3409 warning(cmd); | |
| 3410 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3411 strerror(errno)); | |
| 3412 } | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3413 FREE_C_HEAP_ARRAY(char, cmd); |
| 0 | 3414 // 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
|
3415 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3416 } |
| 3417 #endif // KERNEL | |
| 3418 if (library == NULL) { // Try the local directory | |
| 3419 char ns[1] = {0}; | |
|
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diff
changeset
|
3420 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
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diff
changeset
|
3421 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3422 if (library == NULL) { |
|
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diff
changeset
|
3423 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
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diff
changeset
|
3424 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.
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parents:
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diff
changeset
|
3425 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
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rasbold
parents:
1681
diff
changeset
|
3426 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3427 // If we can't find the agent, exit. |
|
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ab3fd720516c
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diff
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|
3428 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
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diff
changeset
|
3429 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3430 } |
| 3431 } | |
| 3432 } | |
| 3433 agent->set_os_lib(library); | |
| 3434 } | |
| 3435 | |
| 3436 // Find the OnLoad function. | |
| 3437 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
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diff
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|
3438 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3439 if (on_load_entry != NULL) break; |
| 3440 } | |
| 3441 return on_load_entry; | |
| 3442 } | |
| 3443 | |
| 3444 // Find the JVM_OnLoad entry point | |
| 3445 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3446 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3447 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3448 } | |
| 3449 | |
| 3450 // Find the Agent_OnLoad entry point | |
| 3451 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3452 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3453 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3454 } | |
| 3455 | |
| 3456 // For backwards compatibility with -Xrun | |
| 3457 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3458 // treated like -agentpath: | |
| 3459 // Must be called before agent libraries are created | |
| 3460 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3461 AgentLibrary* agent; | |
| 3462 AgentLibrary* next; | |
| 3463 | |
| 3464 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3465 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3466 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3467 | |
| 3468 // If there is an JVM_OnLoad function it will get called later, | |
| 3469 // otherwise see if there is an Agent_OnLoad | |
| 3470 if (on_load_entry == NULL) { | |
| 3471 on_load_entry = lookup_agent_on_load(agent); | |
| 3472 if (on_load_entry != NULL) { | |
| 3473 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3474 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3475 Arguments::convert_library_to_agent(agent); | |
| 3476 } else { | |
| 3477 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3478 } | |
| 3479 } | |
| 3480 } | |
| 3481 } | |
| 3482 | |
| 3483 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3484 // Invokes Agent_OnLoad | |
| 3485 // Called very early -- before JavaThreads exist | |
| 3486 void Threads::create_vm_init_agents() { | |
| 3487 extern struct JavaVM_ main_vm; | |
| 3488 AgentLibrary* agent; | |
| 3489 | |
| 3490 JvmtiExport::enter_onload_phase(); | |
| 3491 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3492 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3493 | |
| 3494 if (on_load_entry != NULL) { | |
| 3495 // Invoke the Agent_OnLoad function | |
| 3496 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3497 if (err != JNI_OK) { | |
| 3498 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3499 } | |
| 3500 } else { | |
| 3501 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3502 } | |
| 3503 } | |
| 3504 JvmtiExport::enter_primordial_phase(); | |
| 3505 } | |
| 3506 | |
| 3507 extern "C" { | |
| 3508 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3509 } | |
| 3510 | |
| 3511 void Threads::shutdown_vm_agents() { | |
| 3512 // Send any Agent_OnUnload notifications | |
| 3513 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3514 extern struct JavaVM_ main_vm; | |
| 3515 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3516 | |
| 3517 // Find the Agent_OnUnload function. | |
| 3518 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3519 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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1972
diff
changeset
|
3520 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3521 |
| 3522 // Invoke the Agent_OnUnload function | |
| 3523 if (unload_entry != NULL) { | |
| 3524 JavaThread* thread = JavaThread::current(); | |
| 3525 ThreadToNativeFromVM ttn(thread); | |
| 3526 HandleMark hm(thread); | |
| 3527 (*unload_entry)(&main_vm); | |
| 3528 break; | |
| 3529 } | |
| 3530 } | |
| 3531 } | |
| 3532 } | |
| 3533 | |
| 3534 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3535 // Invokes JVM_OnLoad | |
| 3536 void Threads::create_vm_init_libraries() { | |
| 3537 extern struct JavaVM_ main_vm; | |
| 3538 AgentLibrary* agent; | |
| 3539 | |
| 3540 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3541 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3542 | |
| 3543 if (on_load_entry != NULL) { | |
| 3544 // Invoke the JVM_OnLoad function | |
| 3545 JavaThread* thread = JavaThread::current(); | |
| 3546 ThreadToNativeFromVM ttn(thread); | |
| 3547 HandleMark hm(thread); | |
| 3548 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3549 if (err != JNI_OK) { | |
| 3550 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3551 } | |
| 3552 } else { | |
| 3553 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3554 } | |
| 3555 } | |
| 3556 } | |
| 3557 | |
| 3558 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3559 void JavaThread::invoke_shutdown_hooks() { | |
| 3560 HandleMark hm(this); | |
| 3561 | |
| 3562 // We could get here with a pending exception, if so clear it now. | |
| 3563 if (this->has_pending_exception()) { | |
| 3564 this->clear_pending_exception(); | |
| 3565 } | |
| 3566 | |
| 3567 EXCEPTION_MARK; | |
| 3568 klassOop k = | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3569 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3570 THREAD); |
| 3571 if (k != NULL) { | |
| 3572 // SystemDictionary::resolve_or_null will return null if there was | |
| 3573 // an exception. If we cannot load the Shutdown class, just don't | |
| 3574 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3575 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3576 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3577 // was called, the Shutdown class would have already been loaded | |
| 3578 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3579 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3580 JavaValue result(T_VOID); | |
| 3581 JavaCalls::call_static(&result, | |
| 3582 shutdown_klass, | |
|
2177
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diff
changeset
|
3583 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3584 vmSymbols::void_method_signature(), |
| 0 | 3585 THREAD); |
| 3586 } | |
| 3587 CLEAR_PENDING_EXCEPTION; | |
| 3588 } | |
| 3589 | |
| 3590 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3591 // the program falls off the end of main(). Another VM exit path is through | |
| 3592 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3593 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3594 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3595 // and VM_Exit op at VM level. | |
| 3596 // | |
| 3597 // Shutdown sequence: | |
| 3598 // + Wait until we are the last non-daemon thread to execute | |
| 3599 // <-- every thing is still working at this moment --> | |
| 3600 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3601 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3602 // + Call before_exit(), prepare for VM exit | |
| 3603 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3604 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3605 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3606 // post thread end and vm death events to JVMTI, | |
| 3607 // stop signal thread | |
| 3608 // + Call JavaThread::exit(), it will: | |
| 3609 // > release JNI handle blocks, remove stack guard pages | |
| 3610 // > remove this thread from Threads list | |
| 3611 // <-- no more Java code from this thread after this point --> | |
| 3612 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3613 // the compiler threads at safepoint | |
| 3614 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3615 // + Disable tracing at JNI/JVM barriers | |
| 3616 // + Set _vm_exited flag for threads that are still running native code | |
| 3617 // + Delete this thread | |
| 3618 // + Call exit_globals() | |
| 3619 // > deletes tty | |
| 3620 // > deletes PerfMemory resources | |
| 3621 // + Return to caller | |
| 3622 | |
| 3623 bool Threads::destroy_vm() { | |
| 3624 JavaThread* thread = JavaThread::current(); | |
| 3625 | |
| 3626 // Wait until we are the last non-daemon thread to execute | |
| 3627 { MutexLocker nu(Threads_lock); | |
| 3628 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3629 // This wait should make safepoint checks, wait without a timeout, | |
| 3630 // and wait as a suspend-equivalent condition. | |
| 3631 // | |
| 3632 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3633 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3634 // is waiting for the external suspend request on this thread to | |
| 3635 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3636 // timeout, but that takes time. Making this wait a suspend- | |
| 3637 // equivalent condition solves that timeout problem. | |
| 3638 // | |
| 3639 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3640 Mutex::_as_suspend_equivalent_flag); | |
| 3641 } | |
| 3642 | |
| 3643 // Hang forever on exit if we are reporting an error. | |
| 3644 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3645 os::infinite_sleep(); | |
| 3646 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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parents:
2203
diff
changeset
|
3647 os::wait_for_keypress_at_exit(); |
| 0 | 3648 |
| 3649 if (JDK_Version::is_jdk12x_version()) { | |
| 3650 // We are the last thread running, so check if finalizers should be run. | |
| 3651 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3652 HandleMark rm(thread); | |
| 3653 Universe::run_finalizers_on_exit(); | |
| 3654 } else { | |
| 3655 // run Java level shutdown hooks | |
| 3656 thread->invoke_shutdown_hooks(); | |
| 3657 } | |
| 3658 | |
| 3659 before_exit(thread); | |
| 3660 | |
| 3661 thread->exit(true); | |
| 3662 | |
| 3663 // Stop VM thread. | |
| 3664 { | |
| 3665 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3666 // GC vm_operations can get caught at the safepoint, and the | |
| 3667 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3668 // to prevent this. The GC vm_operations will not be able to | |
| 3669 // queue until after the vm thread is dead. | |
| 3670 MutexLocker ml(Heap_lock); | |
| 3671 | |
| 3672 VMThread::wait_for_vm_thread_exit(); | |
| 3673 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3674 VMThread::destroy(); | |
| 3675 } | |
| 3676 | |
| 3677 // clean up ideal graph printers | |
| 3678 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3679 IdealGraphPrinter::clean_up(); | |
| 3680 #endif | |
| 3681 | |
| 3682 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3683 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3684 // daemon threads executing native code are still running. But they | |
| 3685 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3686 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3687 | |
| 3688 #ifndef PRODUCT | |
| 3689 // disable function tracing at JNI/JVM barriers | |
| 3690 TraceJNICalls = false; | |
| 3691 TraceJVMCalls = false; | |
| 3692 TraceRuntimeCalls = false; | |
| 3693 #endif | |
| 3694 | |
| 3695 VM_Exit::set_vm_exited(); | |
| 3696 | |
| 3697 notify_vm_shutdown(); | |
| 3698 | |
| 3699 delete thread; | |
| 3700 | |
| 3701 // exit_globals() will delete tty | |
| 3702 exit_globals(); | |
| 3703 | |
| 3704 return true; | |
| 3705 } | |
| 3706 | |
| 3707 | |
| 3708 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3709 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3710 return is_supported_jni_version(version); | |
| 3711 } | |
| 3712 | |
| 3713 | |
| 3714 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3715 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3716 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3717 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3718 return JNI_FALSE; | |
| 3719 } | |
| 3720 | |
| 3721 | |
| 3722 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3723 // The threads lock must be owned at this point | |
| 3724 assert_locked_or_safepoint(Threads_lock); | |
|
1842
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
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1838
diff
changeset
|
3725 |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
3726 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
parents:
1838
diff
changeset
|
3727 // why it is called here. |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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1838
diff
changeset
|
3728 p->initialize_queues(); |
| 0 | 3729 p->set_next(_thread_list); |
| 3730 _thread_list = p; | |
| 3731 _number_of_threads++; | |
| 3732 oop threadObj = p->threadObj(); | |
| 3733 bool daemon = true; | |
| 3734 // Bootstrapping problem: threadObj can be null for initial | |
| 3735 // JavaThread (or for threads attached via JNI) | |
| 3736 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3737 _number_of_non_daemon_threads++; | |
| 3738 daemon = false; | |
| 3739 } | |
| 3740 | |
| 3741 ThreadService::add_thread(p, daemon); | |
| 3742 | |
| 3743 // Possible GC point. | |
| 3744 Events::log("Thread added: " INTPTR_FORMAT, p); | |
| 3745 } | |
| 3746 | |
| 3747 void Threads::remove(JavaThread* p) { | |
| 3748 // Extra scope needed for Thread_lock, so we can check | |
| 3749 // that we do not remove thread without safepoint code notice | |
| 3750 { MutexLocker ml(Threads_lock); | |
| 3751 | |
| 3752 assert(includes(p), "p must be present"); | |
| 3753 | |
| 3754 JavaThread* current = _thread_list; | |
| 3755 JavaThread* prev = NULL; | |
| 3756 | |
| 3757 while (current != p) { | |
| 3758 prev = current; | |
| 3759 current = current->next(); | |
| 3760 } | |
| 3761 | |
| 3762 if (prev) { | |
| 3763 prev->set_next(current->next()); | |
| 3764 } else { | |
| 3765 _thread_list = p->next(); | |
| 3766 } | |
| 3767 _number_of_threads--; | |
| 3768 oop threadObj = p->threadObj(); | |
| 3769 bool daemon = true; | |
| 3770 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3771 _number_of_non_daemon_threads--; | |
| 3772 daemon = false; | |
| 3773 | |
| 3774 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3775 // on destroy_vm will wake up. | |
| 3776 if (number_of_non_daemon_threads() == 1) | |
| 3777 Threads_lock->notify_all(); | |
| 3778 } | |
| 3779 ThreadService::remove_thread(p, daemon); | |
| 3780 | |
| 3781 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3782 // the thread might mess around with locks after this point. This can cause it | |
| 3783 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3784 // of this thread since it is removed from the queue. | |
| 3785 p->set_terminated_value(); | |
| 3786 } // unlock Threads_lock | |
| 3787 | |
| 3788 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
| 3789 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
| 3790 } | |
| 3791 | |
| 3792 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3793 bool Threads::includes(JavaThread* p) { | |
| 3794 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3795 ALL_JAVA_THREADS(q) { | |
| 3796 if (q == p ) { | |
| 3797 return true; | |
| 3798 } | |
| 3799 } | |
| 3800 return false; | |
| 3801 } | |
| 3802 | |
| 3803 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3804 // but the garbage collector must provide a safe context for them to run. | |
| 3805 // In particular, these things should never be called when the Threads_lock | |
| 3806 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3807 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3808 // all threads gets blocked when exiting or starting). | |
| 3809 | |
|
989
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jrose
parents:
844
diff
changeset
|
3810 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3811 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3812 p->oops_do(f, cf); |
| 0 | 3813 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3814 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3815 } |
| 3816 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3817 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3818 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3819 // root groups. Overhead should be small enough to use all the time, | |
| 3820 // even in sequential code. | |
| 3821 SharedHeap* sh = SharedHeap::heap(); | |
| 3822 bool is_par = (sh->n_par_threads() > 0); | |
| 3823 int cp = SharedHeap::heap()->strong_roots_parity(); | |
| 3824 ALL_JAVA_THREADS(p) { | |
| 3825 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
|
3826 p->oops_do(f, cf); |
| 0 | 3827 } |
| 3828 } | |
| 3829 VMThread* vmt = VMThread::vm_thread(); | |
| 3830 if (vmt->claim_oops_do(is_par, cp)) | |
|
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diff
changeset
|
3831 vmt->oops_do(f, cf); |
| 0 | 3832 } |
| 3833 | |
| 3834 #ifndef SERIALGC | |
| 3835 // Used by ParallelScavenge | |
| 3836 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 3837 ALL_JAVA_THREADS(p) { | |
| 3838 q->enqueue(new ThreadRootsTask(p)); | |
| 3839 } | |
| 3840 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 3841 } | |
| 3842 | |
| 3843 // Used by Parallel Old | |
| 3844 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 3845 ALL_JAVA_THREADS(p) { | |
| 3846 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 3847 } | |
| 3848 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 3849 } | |
| 3850 #endif // SERIALGC | |
| 3851 | |
|
989
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diff
changeset
|
3852 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 3853 ALL_JAVA_THREADS(p) { |
|
989
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diff
changeset
|
3854 p->nmethods_do(cf); |
| 0 | 3855 } |
|
989
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changeset
|
3856 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 3857 } |
| 3858 | |
| 3859 void Threads::gc_epilogue() { | |
| 3860 ALL_JAVA_THREADS(p) { | |
| 3861 p->gc_epilogue(); | |
| 3862 } | |
| 3863 } | |
| 3864 | |
| 3865 void Threads::gc_prologue() { | |
| 3866 ALL_JAVA_THREADS(p) { | |
| 3867 p->gc_prologue(); | |
| 3868 } | |
| 3869 } | |
| 3870 | |
| 3871 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 3872 ALL_JAVA_THREADS(p) { | |
| 3873 p->deoptimized_wrt_marked_nmethods(); | |
| 3874 } | |
| 3875 } | |
| 3876 | |
| 3877 | |
| 3878 // Get count Java threads that are waiting to enter the specified monitor. | |
| 3879 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 3880 address monitor, bool doLock) { | |
| 3881 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 3882 "must grab Threads_lock or be at safepoint"); | |
| 3883 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 3884 | |
| 3885 int i = 0; | |
| 3886 { | |
| 3887 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3888 ALL_JAVA_THREADS(p) { | |
| 3889 if (p->is_Compiler_thread()) continue; | |
| 3890 | |
| 3891 address pending = (address)p->current_pending_monitor(); | |
| 3892 if (pending == monitor) { // found a match | |
| 3893 if (i < count) result->append(p); // save the first count matches | |
| 3894 i++; | |
| 3895 } | |
| 3896 } | |
| 3897 } | |
| 3898 return result; | |
| 3899 } | |
| 3900 | |
| 3901 | |
| 3902 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 3903 assert(doLock || | |
| 3904 Threads_lock->owned_by_self() || | |
| 3905 SafepointSynchronize::is_at_safepoint(), | |
| 3906 "must grab Threads_lock or be at safepoint"); | |
| 3907 | |
| 3908 // NULL owner means not locked so we can skip the search | |
| 3909 if (owner == NULL) return NULL; | |
| 3910 | |
| 3911 { | |
| 3912 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3913 ALL_JAVA_THREADS(p) { | |
| 3914 // first, see if owner is the address of a Java thread | |
| 3915 if (owner == (address)p) return p; | |
| 3916 } | |
| 3917 } | |
| 3918 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 3919 if (UseHeavyMonitors) return NULL; | |
| 3920 | |
| 3921 // | |
| 3922 // If we didn't find a matching Java thread and we didn't force use of | |
| 3923 // heavyweight monitors, then the owner is the stack address of the | |
| 3924 // Lock Word in the owning Java thread's stack. | |
| 3925 // | |
| 3926 JavaThread* the_owner = NULL; | |
| 3927 { | |
| 3928 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3929 ALL_JAVA_THREADS(q) { | |
|
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
3930 if (q->is_lock_owned(owner)) { |
| 0 | 3931 the_owner = q; |
|
702
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diff
changeset
|
3932 break; |
| 0 | 3933 } |
| 3934 } | |
| 3935 } | |
| 3936 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 3937 return the_owner; | |
| 3938 } | |
| 3939 | |
| 3940 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 3941 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 3942 char buf[32]; | |
| 3943 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 3944 | |
| 3945 st->print_cr("Full thread dump %s (%s %s):", | |
| 3946 Abstract_VM_Version::vm_name(), | |
| 3947 Abstract_VM_Version::vm_release(), | |
| 3948 Abstract_VM_Version::vm_info_string() | |
| 3949 ); | |
| 3950 st->cr(); | |
| 3951 | |
| 3952 #ifndef SERIALGC | |
| 3953 // Dump concurrent locks | |
| 3954 ConcurrentLocksDump concurrent_locks; | |
| 3955 if (print_concurrent_locks) { | |
| 3956 concurrent_locks.dump_at_safepoint(); | |
| 3957 } | |
| 3958 #endif // SERIALGC | |
| 3959 | |
| 3960 ALL_JAVA_THREADS(p) { | |
| 3961 ResourceMark rm; | |
| 3962 p->print_on(st); | |
| 3963 if (print_stacks) { | |
| 3964 if (internal_format) { | |
| 3965 p->trace_stack(); | |
| 3966 } else { | |
| 3967 p->print_stack_on(st); | |
| 3968 } | |
| 3969 } | |
| 3970 st->cr(); | |
| 3971 #ifndef SERIALGC | |
| 3972 if (print_concurrent_locks) { | |
| 3973 concurrent_locks.print_locks_on(p, st); | |
| 3974 } | |
| 3975 #endif // SERIALGC | |
| 3976 } | |
| 3977 | |
| 3978 VMThread::vm_thread()->print_on(st); | |
| 3979 st->cr(); | |
| 3980 Universe::heap()->print_gc_threads_on(st); | |
| 3981 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 3982 if (wt != NULL) wt->print_on(st); | |
| 3983 st->cr(); | |
| 3984 CompileBroker::print_compiler_threads_on(st); | |
| 3985 st->flush(); | |
| 3986 } | |
| 3987 | |
| 3988 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 3989 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 3990 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 3991 // memory (even in resource area), it might deadlock the error handler. | |
| 3992 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 3993 bool found_current = false; | |
| 3994 st->print_cr("Java Threads: ( => current thread )"); | |
| 3995 ALL_JAVA_THREADS(thread) { | |
| 3996 bool is_current = (current == thread); | |
| 3997 found_current = found_current || is_current; | |
| 3998 | |
| 3999 st->print("%s", is_current ? "=>" : " "); | |
| 4000 | |
| 4001 st->print(PTR_FORMAT, thread); | |
| 4002 st->print(" "); | |
| 4003 thread->print_on_error(st, buf, buflen); | |
| 4004 st->cr(); | |
| 4005 } | |
| 4006 st->cr(); | |
| 4007 | |
| 4008 st->print_cr("Other Threads:"); | |
| 4009 if (VMThread::vm_thread()) { | |
| 4010 bool is_current = (current == VMThread::vm_thread()); | |
| 4011 found_current = found_current || is_current; | |
| 4012 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4013 | |
| 4014 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4015 st->print(" "); | |
| 4016 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4017 st->cr(); | |
| 4018 } | |
| 4019 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4020 if (wt != NULL) { | |
| 4021 bool is_current = (current == wt); | |
| 4022 found_current = found_current || is_current; | |
| 4023 st->print("%s", is_current ? "=>" : " "); | |
| 4024 | |
| 4025 st->print(PTR_FORMAT, wt); | |
| 4026 st->print(" "); | |
| 4027 wt->print_on_error(st, buf, buflen); | |
| 4028 st->cr(); | |
| 4029 } | |
| 4030 if (!found_current) { | |
| 4031 st->cr(); | |
| 4032 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4033 current->print_on_error(st, buf, buflen); | |
| 4034 st->cr(); | |
| 4035 } | |
| 4036 } | |
| 4037 | |
| 1878 | 4038 // Internal SpinLock and Mutex |
| 4039 // Based on ParkEvent | |
| 4040 | |
| 4041 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4042 // |
| 1878 | 4043 // We employ SpinLocks _only for low-contention, fixed-length |
| 4044 // short-duration critical sections where we're concerned | |
| 4045 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4046 // The mux construct provides a spin-then-block mutual exclusion | |
| 4047 // mechanism. | |
| 4048 // | |
| 4049 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4050 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4051 // for the JVM to devolve to yielding with little progress. This is true | |
| 4052 // despite the fact that the critical sections protected by ListLock are | |
| 4053 // extremely short. | |
| 0 | 4054 // |
| 1878 | 4055 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4056 // We should make this a 1st-class type, integrated into the lock | |
| 4057 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4058 // should have sufficient padding to avoid false-sharing and excessive | |
| 4059 // cache-coherency traffic. | |
| 4060 | |
| 4061 | |
| 4062 typedef volatile int SpinLockT ; | |
| 4063 | |
| 4064 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4065 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4066 return ; // normal fast-path return | |
| 4067 } | |
| 4068 | |
| 4069 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4070 TEVENT (SpinAcquire - ctx) ; | |
| 4071 int ctr = 0 ; | |
| 4072 int Yields = 0 ; | |
| 0 | 4073 for (;;) { |
| 1878 | 4074 while (*adr != 0) { |
| 4075 ++ctr ; | |
| 4076 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4077 if (Yields > 5) { | |
| 4078 // Consider using a simple NakedSleep() instead. | |
| 4079 // Then SpinAcquire could be called by non-JVM threads | |
| 4080 Thread::current()->_ParkEvent->park(1) ; | |
| 4081 } else { | |
| 4082 os::NakedYield() ; | |
| 4083 ++Yields ; | |
| 4084 } | |
| 4085 } else { | |
| 4086 SpinPause() ; | |
| 0 | 4087 } |
| 1878 | 4088 } |
| 4089 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4090 } |
| 4091 } | |
| 4092 | |
| 1878 | 4093 void Thread::SpinRelease (volatile int * adr) { |
| 4094 assert (*adr != 0, "invariant") ; | |
| 4095 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4096 // Roach-motel semantics. | |
| 4097 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4098 // but prior LDs and STs within the critical section can't be allowed | |
| 4099 // to reorder or float past the ST that releases the lock. | |
| 4100 *adr = 0 ; | |
| 0 | 4101 } |
| 4102 | |
| 1878 | 4103 // muxAcquire and muxRelease: |
| 4104 // | |
| 4105 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4106 // The LSB of the word is set IFF the lock is held. | |
| 4107 // The remainder of the word points to the head of a singly-linked list | |
| 4108 // of threads blocked on the lock. | |
| 4109 // | |
| 4110 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4111 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4112 // minimizing the peak number of extant ParkEvent instances then | |
| 4113 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4114 // as certain invariants were satisfied. Specifically, care would need | |
| 4115 // to be taken with regards to consuming unpark() "permits". | |
| 4116 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4117 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4118 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4119 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4120 // One way around this would be to widen the restricted-range semaphore | |
| 4121 // implemented in park(). Another alternative would be to provide | |
| 4122 // multiple instances of the PlatformEvent() for each thread. One | |
| 4123 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4124 // | |
| 4125 // * Usage: | |
| 4126 // -- Only as leaf locks | |
| 4127 // -- for short-term locking only as muxAcquire does not perform | |
| 4128 // thread state transitions. | |
| 4129 // | |
| 4130 // Alternatives: | |
| 4131 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4132 // but with parking or spin-then-park instead of pure spinning. | |
| 4133 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4134 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4135 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4136 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4137 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4138 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4139 // boundaries by using placement-new. | |
| 4140 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4141 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4142 // The validity of the backlinks must be ratified before we trust the value. | |
| 4143 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4144 // the forward links, which are always trustworthy. | |
| 4145 // * Add a successor indication. The LockWord is currently encoded as | |
| 4146 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4147 // to provide the usual futile-wakeup optimization. | |
| 4148 // See RTStt for details. | |
| 4149 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4150 // | |
| 4151 | |
| 4152 | |
| 4153 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4154 enum MuxBits { LOCKBIT = 1 } ; | |
| 4155 | |
| 4156 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4157 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4158 if (w == 0) return ; | |
| 4159 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4160 return ; | |
| 4161 } | |
| 4162 | |
| 4163 TEVENT (muxAcquire - Contention) ; | |
| 4164 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4165 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4166 for (;;) { |
| 1878 | 4167 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4168 | |
| 4169 // Optional spin phase: spin-then-park strategy | |
| 4170 while (--its >= 0) { | |
| 4171 w = *Lock ; | |
| 4172 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4173 return ; | |
| 4174 } | |
| 4175 } | |
| 4176 | |
| 4177 Self->reset() ; | |
| 4178 Self->OnList = intptr_t(Lock) ; | |
| 4179 // The following fence() isn't _strictly necessary as the subsequent | |
| 4180 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4181 OrderAccess::fence(); | |
| 4182 for (;;) { | |
| 4183 w = *Lock ; | |
| 4184 if ((w & LOCKBIT) == 0) { | |
| 4185 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4186 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4187 return ; | |
| 4188 } | |
| 4189 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4190 } |
| 1878 | 4191 assert (w & LOCKBIT, "invariant") ; |
| 4192 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4193 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4194 } | |
| 4195 | |
| 4196 while (Self->OnList != 0) { | |
| 4197 Self->park() ; | |
| 4198 } | |
| 0 | 4199 } |
| 4200 } | |
| 4201 | |
| 1878 | 4202 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4203 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4204 if (w == 0) return ; | |
| 4205 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4206 return ; | |
| 4207 } | |
| 4208 | |
| 4209 TEVENT (muxAcquire - Contention) ; | |
| 4210 ParkEvent * ReleaseAfter = NULL ; | |
| 4211 if (ev == NULL) { | |
| 4212 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4213 } | |
| 4214 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4215 for (;;) { | |
| 4216 guarantee (ev->OnList == 0, "invariant") ; | |
| 4217 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4218 | |
| 4219 // Optional spin phase: spin-then-park strategy | |
| 4220 while (--its >= 0) { | |
| 4221 w = *Lock ; | |
| 4222 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4223 if (ReleaseAfter != NULL) { | |
| 4224 ParkEvent::Release (ReleaseAfter) ; | |
| 4225 } | |
| 4226 return ; | |
| 4227 } | |
| 4228 } | |
| 4229 | |
| 4230 ev->reset() ; | |
| 4231 ev->OnList = intptr_t(Lock) ; | |
| 4232 // The following fence() isn't _strictly necessary as the subsequent | |
| 4233 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4234 OrderAccess::fence(); | |
| 4235 for (;;) { | |
| 4236 w = *Lock ; | |
| 4237 if ((w & LOCKBIT) == 0) { | |
| 4238 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4239 ev->OnList = 0 ; | |
| 4240 // We call ::Release while holding the outer lock, thus | |
| 4241 // artificially lengthening the critical section. | |
| 4242 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4243 // after we've dropped the outer lock. | |
| 4244 if (ReleaseAfter != NULL) { | |
| 4245 ParkEvent::Release (ReleaseAfter) ; | |
| 4246 } | |
| 4247 return ; | |
| 4248 } | |
| 4249 continue ; // Interference -- *Lock changed -- Just retry | |
| 4250 } | |
| 4251 assert (w & LOCKBIT, "invariant") ; | |
| 4252 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4253 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4254 } | |
| 4255 | |
| 4256 while (ev->OnList != 0) { | |
| 4257 ev->park() ; | |
| 4258 } | |
| 4259 } | |
| 4260 } | |
| 4261 | |
| 4262 // Release() must extract a successor from the list and then wake that thread. | |
| 4263 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4264 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4265 // Release() would : | |
| 4266 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4267 // (B) Extract a successor from the private list "in-hand" | |
| 4268 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4269 // If there were any newly arrived threads and the CAS() would fail. | |
| 4270 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4271 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4272 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4273 // The wakee would be responsible for reattaching and remerging before it | |
| 4274 // competed for the lock. | |
| 4275 // | |
| 4276 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4277 // multiple concurrent pushers, but only one popper or detacher. | |
| 4278 // This implementation pops from the head of the list. This is unfair, | |
| 4279 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4280 // (We wake recently run threads first). | |
| 4281 | |
| 4282 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4283 for (;;) { | |
| 4284 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4285 assert (w & LOCKBIT, "invariant") ; | |
| 4286 if (w == LOCKBIT) return ; | |
| 4287 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4288 assert (List != NULL, "invariant") ; | |
| 4289 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4290 ParkEvent * nxt = List->ListNext ; | |
| 4291 | |
| 4292 // The following CAS() releases the lock and pops the head element. | |
| 4293 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4294 continue ; | |
| 4295 } | |
| 4296 List->OnList = 0 ; | |
| 4297 OrderAccess::fence() ; | |
| 4298 List->unpark () ; | |
| 4299 return ; | |
| 4300 } | |
| 4301 } | |
| 4302 | |
| 4303 | |
| 0 | 4304 void Threads::verify() { |
| 4305 ALL_JAVA_THREADS(p) { | |
| 4306 p->verify(); | |
| 4307 } | |
| 4308 VMThread* thread = VMThread::vm_thread(); | |
| 4309 if (thread != NULL) thread->verify(); | |
| 4310 } |