Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 5110:0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
| author | Christian Haeubl <christian.haeubl@oracle.com> |
|---|---|
| date | Thu, 15 Mar 2012 15:31:34 -0700 |
| parents | 2f2c6347fce4 |
| children | 422c979ff392 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
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32 #ifdef GRAAL |
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33 #include "graal/graalCompiler.hpp" |
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34 #endif |
| 1972 | 35 #include "interpreter/interpreter.hpp" |
| 36 #include "interpreter/linkResolver.hpp" | |
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37 #include "interpreter/oopMapCache.hpp" |
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38 #include "jvmtifiles/jvmtiEnv.hpp" |
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39 #include "memory/gcLocker.inline.hpp" |
| 1972 | 40 #include "memory/oopFactory.hpp" |
| 41 #include "memory/universe.inline.hpp" | |
| 42 #include "oops/instanceKlass.hpp" | |
| 43 #include "oops/objArrayOop.hpp" | |
| 44 #include "oops/oop.inline.hpp" | |
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45 #include "oops/symbol.hpp" |
| 1972 | 46 #include "prims/jvm_misc.hpp" |
| 47 #include "prims/jvmtiExport.hpp" | |
| 48 #include "prims/jvmtiThreadState.hpp" | |
| 49 #include "prims/privilegedStack.hpp" | |
| 50 #include "runtime/aprofiler.hpp" | |
| 51 #include "runtime/arguments.hpp" | |
| 52 #include "runtime/biasedLocking.hpp" | |
| 53 #include "runtime/deoptimization.hpp" | |
| 54 #include "runtime/fprofiler.hpp" | |
| 55 #include "runtime/frame.inline.hpp" | |
| 56 #include "runtime/init.hpp" | |
| 57 #include "runtime/interfaceSupport.hpp" | |
| 58 #include "runtime/java.hpp" | |
| 59 #include "runtime/javaCalls.hpp" | |
| 60 #include "runtime/jniPeriodicChecker.hpp" | |
| 61 #include "runtime/memprofiler.hpp" | |
| 62 #include "runtime/mutexLocker.hpp" | |
| 63 #include "runtime/objectMonitor.hpp" | |
| 64 #include "runtime/osThread.hpp" | |
| 65 #include "runtime/safepoint.hpp" | |
| 66 #include "runtime/sharedRuntime.hpp" | |
| 67 #include "runtime/statSampler.hpp" | |
| 68 #include "runtime/stubRoutines.hpp" | |
| 69 #include "runtime/task.hpp" | |
| 70 #include "runtime/threadCritical.hpp" | |
| 71 #include "runtime/threadLocalStorage.hpp" | |
| 72 #include "runtime/vframe.hpp" | |
| 73 #include "runtime/vframeArray.hpp" | |
| 74 #include "runtime/vframe_hp.hpp" | |
| 75 #include "runtime/vmThread.hpp" | |
| 76 #include "runtime/vm_operations.hpp" | |
| 77 #include "services/attachListener.hpp" | |
| 78 #include "services/management.hpp" | |
| 79 #include "services/threadService.hpp" | |
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80 #include "trace/traceEventTypes.hpp" |
| 1972 | 81 #include "utilities/defaultStream.hpp" |
| 82 #include "utilities/dtrace.hpp" | |
| 83 #include "utilities/events.hpp" | |
| 84 #include "utilities/preserveException.hpp" | |
| 85 #ifdef TARGET_OS_FAMILY_linux | |
| 86 # include "os_linux.inline.hpp" | |
| 87 # include "thread_linux.inline.hpp" | |
| 88 #endif | |
| 89 #ifdef TARGET_OS_FAMILY_solaris | |
| 90 # include "os_solaris.inline.hpp" | |
| 91 # include "thread_solaris.inline.hpp" | |
| 92 #endif | |
| 93 #ifdef TARGET_OS_FAMILY_windows | |
| 94 # include "os_windows.inline.hpp" | |
| 95 # include "thread_windows.inline.hpp" | |
| 96 #endif | |
| 3960 | 97 #ifdef TARGET_OS_FAMILY_bsd |
| 98 # include "os_bsd.inline.hpp" | |
| 99 # include "thread_bsd.inline.hpp" | |
| 100 #endif | |
| 1972 | 101 #ifndef SERIALGC |
| 102 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 103 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 104 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 105 #endif | |
| 106 #ifdef COMPILER1 | |
| 107 #include "c1/c1_Compiler.hpp" | |
| 108 #endif | |
| 109 #ifdef COMPILER2 | |
| 110 #include "opto/c2compiler.hpp" | |
| 111 #include "opto/idealGraphPrinter.hpp" | |
| 112 #endif | |
| 0 | 113 |
| 114 #ifdef DTRACE_ENABLED | |
| 115 | |
| 116 // Only bother with this argument setup if dtrace is available | |
| 117 | |
| 4006 | 118 #ifndef USDT2 |
| 0 | 119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 120 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 121 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 122 intptr_t, intptr_t, bool); | |
| 123 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 124 intptr_t, intptr_t, bool); | |
| 125 | |
| 126 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 127 { \ | |
| 128 ResourceMark rm(this); \ | |
| 129 int len = 0; \ | |
| 130 const char* name = (javathread)->get_thread_name(); \ | |
| 131 len = strlen(name); \ | |
| 132 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 133 name, len, \ | |
| 134 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 135 (javathread)->osthread()->thread_id(), \ | |
| 136 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 137 } | |
| 138 | |
| 4006 | 139 #else /* USDT2 */ |
| 140 | |
| 141 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 142 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 143 | |
| 144 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 145 { \ | |
| 146 ResourceMark rm(this); \ | |
| 147 int len = 0; \ | |
| 148 const char* name = (javathread)->get_thread_name(); \ | |
| 149 len = strlen(name); \ | |
| 150 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 151 (char *) name, len, \ | |
| 152 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 153 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 154 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 155 } | |
| 156 | |
| 157 #endif /* USDT2 */ | |
| 158 | |
| 0 | 159 #else // ndef DTRACE_ENABLED |
| 160 | |
| 161 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 162 | |
| 163 #endif // ndef DTRACE_ENABLED | |
| 164 | |
| 165 // Class hierarchy | |
| 166 // - Thread | |
| 167 // - VMThread | |
| 168 // - WatcherThread | |
| 169 // - ConcurrentMarkSweepThread | |
| 170 // - JavaThread | |
| 171 // - CompilerThread | |
| 172 | |
| 173 // ======= Thread ======== | |
| 174 | |
| 175 // Support for forcing alignment of thread objects for biased locking | |
| 176 void* Thread::operator new(size_t size) { | |
| 177 if (UseBiasedLocking) { | |
| 178 const int alignment = markOopDesc::biased_lock_alignment; | |
| 179 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 180 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 181 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 182 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 183 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 184 "JavaThread alignment code overflowed allocated storage"); | |
| 185 if (TraceBiasedLocking) { | |
| 186 if (aligned_addr != real_malloc_addr) | |
| 187 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 188 real_malloc_addr, aligned_addr); | |
| 189 } | |
| 190 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 191 return aligned_addr; | |
| 192 } else { | |
| 193 return CHeapObj::operator new(size); | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 void Thread::operator delete(void* p) { | |
| 198 if (UseBiasedLocking) { | |
| 199 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 200 CHeapObj::operator delete(real_malloc_addr); | |
| 201 } else { | |
| 202 CHeapObj::operator delete(p); | |
| 203 } | |
| 204 } | |
| 205 | |
| 206 | |
| 207 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 208 // JavaThread | |
| 209 | |
| 210 | |
| 211 Thread::Thread() { | |
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212 // stack and get_thread |
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213 set_stack_base(NULL); |
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214 set_stack_size(0); |
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215 set_self_raw_id(0); |
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216 set_lgrp_id(-1); |
| 0 | 217 |
| 218 // allocated data structures | |
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219 set_osthread(NULL); |
| 0 | 220 set_resource_area(new ResourceArea()); |
| 221 set_handle_area(new HandleArea(NULL)); | |
| 222 set_active_handles(NULL); | |
| 223 set_free_handle_block(NULL); | |
| 224 set_last_handle_mark(NULL); | |
| 225 | |
| 226 // This initial value ==> never claimed. | |
| 227 _oops_do_parity = 0; | |
| 228 | |
| 229 // the handle mark links itself to last_handle_mark | |
| 230 new HandleMark(this); | |
| 231 | |
| 232 // plain initialization | |
| 233 debug_only(_owned_locks = NULL;) | |
| 234 debug_only(_allow_allocation_count = 0;) | |
| 235 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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236 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 237 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 238 _jvmti_env_iteration_count = 0; | |
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239 set_allocated_bytes(0); |
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240 set_trace_buffer(NULL); |
| 0 | 241 _vm_operation_started_count = 0; |
| 242 _vm_operation_completed_count = 0; | |
| 243 _current_pending_monitor = NULL; | |
| 244 _current_pending_monitor_is_from_java = true; | |
| 245 _current_waiting_monitor = NULL; | |
| 246 _num_nested_signal = 0; | |
| 247 omFreeList = NULL ; | |
| 248 omFreeCount = 0 ; | |
| 249 omFreeProvision = 32 ; | |
| 1587 | 250 omInUseList = NULL ; |
| 251 omInUseCount = 0 ; | |
| 0 | 252 |
| 253 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 254 _suspend_flags = 0; | |
| 255 | |
| 256 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 257 _hashStateX = os::random() ; | |
| 258 _hashStateY = 842502087 ; | |
| 259 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 260 _hashStateW = 273326509 ; | |
| 261 | |
| 262 _OnTrap = 0 ; | |
| 263 _schedctl = NULL ; | |
| 264 _Stalled = 0 ; | |
| 265 _TypeTag = 0x2BAD ; | |
| 266 | |
| 267 // Many of the following fields are effectively final - immutable | |
| 268 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 269 // construct until the _MutexEvent is initialized ... | |
| 270 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 271 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 272 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 273 // and ::Release() | |
| 274 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 275 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 276 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 277 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 278 | |
| 279 #ifdef CHECK_UNHANDLED_OOPS | |
| 280 if (CheckUnhandledOops) { | |
| 281 _unhandled_oops = new UnhandledOops(this); | |
| 282 } | |
| 283 #endif // CHECK_UNHANDLED_OOPS | |
| 284 #ifdef ASSERT | |
| 285 if (UseBiasedLocking) { | |
| 286 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 287 assert(this == _real_malloc_address || | |
| 288 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 289 "bug in forced alignment of thread objects"); | |
| 290 } | |
| 291 #endif /* ASSERT */ | |
| 292 } | |
| 293 | |
| 294 void Thread::initialize_thread_local_storage() { | |
| 295 // Note: Make sure this method only calls | |
| 296 // non-blocking operations. Otherwise, it might not work | |
| 297 // with the thread-startup/safepoint interaction. | |
| 298 | |
| 299 // During Java thread startup, safepoint code should allow this | |
| 300 // method to complete because it may need to allocate memory to | |
| 301 // store information for the new thread. | |
| 302 | |
| 303 // initialize structure dependent on thread local storage | |
| 304 ThreadLocalStorage::set_thread(this); | |
| 305 | |
| 306 // set up any platform-specific state. | |
| 307 os::initialize_thread(); | |
| 308 | |
| 309 } | |
| 310 | |
| 311 void Thread::record_stack_base_and_size() { | |
| 312 set_stack_base(os::current_stack_base()); | |
| 313 set_stack_size(os::current_stack_size()); | |
| 314 } | |
| 315 | |
| 316 | |
| 317 Thread::~Thread() { | |
| 318 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 319 ObjectSynchronizer::omFlush (this) ; | |
| 320 | |
| 321 // deallocate data structures | |
| 322 delete resource_area(); | |
| 323 // since the handle marks are using the handle area, we have to deallocated the root | |
| 324 // handle mark before deallocating the thread's handle area, | |
| 325 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 326 delete last_handle_mark(); | |
| 327 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 328 | |
| 329 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 330 // We NULL out the fields for good hygiene. | |
| 331 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 332 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 333 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 334 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 335 | |
| 336 delete handle_area(); | |
| 337 | |
| 338 // osthread() can be NULL, if creation of thread failed. | |
| 339 if (osthread() != NULL) os::free_thread(osthread()); | |
| 340 | |
| 341 delete _SR_lock; | |
| 342 | |
| 343 // clear thread local storage if the Thread is deleting itself | |
| 344 if (this == Thread::current()) { | |
| 345 ThreadLocalStorage::set_thread(NULL); | |
| 346 } else { | |
| 347 // In the case where we're not the current thread, invalidate all the | |
| 348 // caches in case some code tries to get the current thread or the | |
| 349 // thread that was destroyed, and gets stale information. | |
| 350 ThreadLocalStorage::invalidate_all(); | |
| 351 } | |
| 352 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 353 } | |
| 354 | |
| 355 // NOTE: dummy function for assertion purpose. | |
| 356 void Thread::run() { | |
| 357 ShouldNotReachHere(); | |
| 358 } | |
| 359 | |
| 360 #ifdef ASSERT | |
| 361 // Private method to check for dangling thread pointer | |
| 362 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 363 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 364 "possibility of dangling Thread pointer"); | |
| 365 } | |
| 366 #endif | |
| 367 | |
| 368 | |
| 369 #ifndef PRODUCT | |
| 370 // Tracing method for basic thread operations | |
| 371 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 372 if (!TraceThreadEvents) return; | |
| 373 ResourceMark rm; | |
| 374 ThreadCritical tc; | |
| 375 const char *name = "non-Java thread"; | |
| 376 int prio = -1; | |
| 377 if (thread->is_Java_thread() | |
| 378 && !thread->is_Compiler_thread()) { | |
| 379 // The Threads_lock must be held to get information about | |
| 380 // this thread but may not be in some situations when | |
| 381 // tracing thread events. | |
| 382 bool release_Threads_lock = false; | |
| 383 if (!Threads_lock->owned_by_self()) { | |
| 384 Threads_lock->lock(); | |
| 385 release_Threads_lock = true; | |
| 386 } | |
| 387 JavaThread* jt = (JavaThread *)thread; | |
| 388 name = (char *)jt->get_thread_name(); | |
| 389 oop thread_oop = jt->threadObj(); | |
| 390 if (thread_oop != NULL) { | |
| 391 prio = java_lang_Thread::priority(thread_oop); | |
| 392 } | |
| 393 if (release_Threads_lock) { | |
| 394 Threads_lock->unlock(); | |
| 395 } | |
| 396 } | |
| 397 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 398 } | |
| 399 #endif | |
| 400 | |
| 401 | |
| 402 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 403 trace("get priority", thread); | |
| 404 ThreadPriority priority; | |
| 405 // Can return an error! | |
| 406 (void)os::get_priority(thread, priority); | |
| 407 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 408 return priority; | |
| 409 } | |
| 410 | |
| 411 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 412 trace("set priority", thread); | |
| 413 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 414 // Can return an error! | |
| 415 (void)os::set_priority(thread, priority); | |
| 416 } | |
| 417 | |
| 418 | |
| 419 void Thread::start(Thread* thread) { | |
| 420 trace("start", thread); | |
| 421 // Start is different from resume in that its safety is guaranteed by context or | |
| 422 // being called from a Java method synchronized on the Thread object. | |
| 423 if (!DisableStartThread) { | |
| 424 if (thread->is_Java_thread()) { | |
| 425 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 426 // Can not set it after the thread started because we do not know the | |
| 427 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 428 // in SLEEPING or some other state. | |
| 429 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 430 java_lang_Thread::RUNNABLE); | |
| 431 } | |
| 432 os::start_thread(thread); | |
| 433 } | |
| 434 } | |
| 435 | |
| 436 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 437 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 438 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 439 VMThread::execute(vm_stop); | |
| 440 } | |
| 441 | |
| 442 | |
| 443 // | |
| 444 // Check if an external suspend request has completed (or has been | |
| 445 // cancelled). Returns true if the thread is externally suspended and | |
| 446 // false otherwise. | |
| 447 // | |
| 448 // The bits parameter returns information about the code path through | |
| 449 // the routine. Useful for debugging: | |
| 450 // | |
| 451 // set in is_ext_suspend_completed(): | |
| 452 // 0x00000001 - routine was entered | |
| 453 // 0x00000010 - routine return false at end | |
| 454 // 0x00000100 - thread exited (return false) | |
| 455 // 0x00000200 - suspend request cancelled (return false) | |
| 456 // 0x00000400 - thread suspended (return true) | |
| 457 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 458 // 0x00002000 - thread is native and walkable (return true) | |
| 459 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 460 // | |
| 461 // set in wait_for_ext_suspend_completion(): | |
| 462 // 0x00010000 - routine was entered | |
| 463 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 464 // 0x00040000 - thread suspended before loop (return true) | |
| 465 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 466 // 0x00100000 - thread suspended in loop (return true) | |
| 467 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 468 // | |
| 469 | |
| 470 // Helper class for tracing suspend wait debug bits. | |
| 471 // | |
| 472 // 0x00000100 indicates that the target thread exited before it could | |
| 473 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 474 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 475 // count as wait failures either. | |
| 476 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 477 | |
| 478 class TraceSuspendDebugBits : public StackObj { | |
| 479 private: | |
| 480 JavaThread * jt; | |
| 481 bool is_wait; | |
| 482 bool called_by_wait; // meaningful when !is_wait | |
| 483 uint32_t * bits; | |
| 484 | |
| 485 public: | |
| 486 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 487 uint32_t *_bits) { | |
| 488 jt = _jt; | |
| 489 is_wait = _is_wait; | |
| 490 called_by_wait = _called_by_wait; | |
| 491 bits = _bits; | |
| 492 } | |
| 493 | |
| 494 ~TraceSuspendDebugBits() { | |
| 495 if (!is_wait) { | |
| 496 #if 1 | |
| 497 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 498 // That trace is very chatty. | |
| 499 return; | |
| 500 #else | |
| 501 if (!called_by_wait) { | |
| 502 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 503 // trace calls to it from wait_for_ext_suspend_completion() | |
| 504 return; | |
| 505 } | |
| 506 #endif | |
| 507 } | |
| 508 | |
| 509 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 510 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 511 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 512 ResourceMark rm; | |
| 513 | |
| 514 tty->print_cr( | |
| 515 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 516 jt->get_thread_name(), *bits); | |
| 517 | |
| 518 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 519 } | |
| 520 } | |
| 521 } | |
| 522 }; | |
| 523 #undef DEBUG_FALSE_BITS | |
| 524 | |
| 525 | |
| 526 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 527 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 528 | |
| 529 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 530 bool do_trans_retry; // flag to force the retry | |
| 531 | |
| 532 *bits |= 0x00000001; | |
| 533 | |
| 534 do { | |
| 535 do_trans_retry = false; | |
| 536 | |
| 537 if (is_exiting()) { | |
| 538 // Thread is in the process of exiting. This is always checked | |
| 539 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 540 *bits |= 0x00000100; | |
| 541 return false; | |
| 542 } | |
| 543 | |
| 544 if (!is_external_suspend()) { | |
| 545 // Suspend request is cancelled. This is always checked before | |
| 546 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 547 // confusing the thread that made the suspend request. | |
| 548 *bits |= 0x00000200; | |
| 549 return false; | |
| 550 } | |
| 551 | |
| 552 if (is_ext_suspended()) { | |
| 553 // thread is suspended | |
| 554 *bits |= 0x00000400; | |
| 555 return true; | |
| 556 } | |
| 557 | |
| 558 // Now that we no longer do hard suspends of threads running | |
| 559 // native code, the target thread can be changing thread state | |
| 560 // while we are in this routine: | |
| 561 // | |
| 562 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 563 // | |
| 564 // We save a copy of the thread state as observed at this moment | |
| 565 // and make our decision about suspend completeness based on the | |
| 566 // copy. This closes the race where the thread state is seen as | |
| 567 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 568 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 569 JavaThreadState save_state = thread_state(); | |
| 570 | |
| 571 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 572 // If the thread's state is _thread_blocked and this blocking | |
| 573 // condition is known to be equivalent to a suspend, then we can | |
| 574 // consider the thread to be externally suspended. This means that | |
| 575 // the code that sets _thread_blocked has been modified to do | |
| 576 // self-suspension if the blocking condition releases. We also | |
| 577 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 578 // the _thread_blocked with self-suspension check. | |
| 579 // | |
| 580 // Return true since we wouldn't be here unless there was still an | |
| 581 // external suspend request. | |
| 582 *bits |= 0x00001000; | |
| 583 return true; | |
| 584 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 585 // Threads running native code will self-suspend on native==>VM/Java | |
| 586 // transitions. If its stack is walkable (should always be the case | |
| 587 // unless this function is called before the actual java_suspend() | |
| 588 // call), then the wait is done. | |
| 589 *bits |= 0x00002000; | |
| 590 return true; | |
| 591 } else if (!called_by_wait && !did_trans_retry && | |
| 592 save_state == _thread_in_native_trans && | |
| 593 frame_anchor()->walkable()) { | |
| 594 // The thread is transitioning from thread_in_native to another | |
| 595 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 596 // will force the thread to self-suspend. If it hasn't gotten | |
| 597 // there yet we may have caught the thread in-between the native | |
| 598 // code check above and the self-suspend. Lucky us. If we were | |
| 599 // called by wait_for_ext_suspend_completion(), then it | |
| 600 // will be doing the retries so we don't have to. | |
| 601 // | |
| 602 // Since we use the saved thread state in the if-statement above, | |
| 603 // there is a chance that the thread has already transitioned to | |
| 604 // _thread_blocked by the time we get here. In that case, we will | |
| 605 // make a single unnecessary pass through the logic below. This | |
| 606 // doesn't hurt anything since we still do the trans retry. | |
| 607 | |
| 608 *bits |= 0x00004000; | |
| 609 | |
| 610 // Once the thread leaves thread_in_native_trans for another | |
| 611 // thread state, we break out of this retry loop. We shouldn't | |
| 612 // need this flag to prevent us from getting back here, but | |
| 613 // sometimes paranoia is good. | |
| 614 did_trans_retry = true; | |
| 615 | |
| 616 // We wait for the thread to transition to a more usable state. | |
| 617 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 618 // We used to do an "os::yield_all(i)" call here with the intention | |
| 619 // that yielding would increase on each retry. However, the parameter | |
| 620 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 621 // on the SR_lock below provides a much more predictable scale up for | |
| 622 // the delay. It also provides a simple/direct point to check for any | |
| 623 // safepoint requests from the VMThread | |
| 624 | |
| 625 // temporarily drops SR_lock while doing wait with safepoint check | |
| 626 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 627 // and increase delay with each retry | |
| 628 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 629 | |
| 630 // check the actual thread state instead of what we saved above | |
| 631 if (thread_state() != _thread_in_native_trans) { | |
| 632 // the thread has transitioned to another thread state so | |
| 633 // try all the checks (except this one) one more time. | |
| 634 do_trans_retry = true; | |
| 635 break; | |
| 636 } | |
| 637 } // end retry loop | |
| 638 | |
| 639 | |
| 640 } | |
| 641 } while (do_trans_retry); | |
| 642 | |
| 643 *bits |= 0x00000010; | |
| 644 return false; | |
| 645 } | |
| 646 | |
| 647 // | |
| 648 // Wait for an external suspend request to complete (or be cancelled). | |
| 649 // Returns true if the thread is externally suspended and false otherwise. | |
| 650 // | |
| 651 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 652 uint32_t *bits) { | |
| 653 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 654 false /* !called_by_wait */, bits); | |
| 655 | |
| 656 // local flag copies to minimize SR_lock hold time | |
| 657 bool is_suspended; | |
| 658 bool pending; | |
| 659 uint32_t reset_bits; | |
| 660 | |
| 661 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 662 *bits |= 0x00010000; | |
| 663 | |
| 664 // We use reset_bits to reinitialize the bits value at the top of | |
| 665 // each retry loop. This allows the caller to make use of any | |
| 666 // unused bits for their own marking purposes. | |
| 667 reset_bits = *bits; | |
| 668 | |
| 669 { | |
| 670 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 671 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 672 delay, bits); | |
| 673 pending = is_external_suspend(); | |
| 674 } | |
| 675 // must release SR_lock to allow suspension to complete | |
| 676 | |
| 677 if (!pending) { | |
| 678 // A cancelled suspend request is the only false return from | |
| 679 // is_ext_suspend_completed() that keeps us from entering the | |
| 680 // retry loop. | |
| 681 *bits |= 0x00020000; | |
| 682 return false; | |
| 683 } | |
| 684 | |
| 685 if (is_suspended) { | |
| 686 *bits |= 0x00040000; | |
| 687 return true; | |
| 688 } | |
| 689 | |
| 690 for (int i = 1; i <= retries; i++) { | |
| 691 *bits = reset_bits; // reinit to only track last retry | |
| 692 | |
| 693 // We used to do an "os::yield_all(i)" call here with the intention | |
| 694 // that yielding would increase on each retry. However, the parameter | |
| 695 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 696 // on the SR_lock below provides a much more predictable scale up for | |
| 697 // the delay. It also provides a simple/direct point to check for any | |
| 698 // safepoint requests from the VMThread | |
| 699 | |
| 700 { | |
| 701 MutexLocker ml(SR_lock()); | |
| 702 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 703 // can also call this) and increase delay with each retry | |
| 704 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 705 | |
| 706 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 707 delay, bits); | |
| 708 | |
| 709 // It is possible for the external suspend request to be cancelled | |
| 710 // (by a resume) before the actual suspend operation is completed. | |
| 711 // Refresh our local copy to see if we still need to wait. | |
| 712 pending = is_external_suspend(); | |
| 713 } | |
| 714 | |
| 715 if (!pending) { | |
| 716 // A cancelled suspend request is the only false return from | |
| 717 // is_ext_suspend_completed() that keeps us from staying in the | |
| 718 // retry loop. | |
| 719 *bits |= 0x00080000; | |
| 720 return false; | |
| 721 } | |
| 722 | |
| 723 if (is_suspended) { | |
| 724 *bits |= 0x00100000; | |
| 725 return true; | |
| 726 } | |
| 727 } // end retry loop | |
| 728 | |
| 729 // thread did not suspend after all our retries | |
| 730 *bits |= 0x00200000; | |
| 731 return false; | |
| 732 } | |
| 733 | |
| 734 #ifndef PRODUCT | |
| 735 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 736 | |
| 737 // This should not need to be atomic as the only way for simultaneous | |
| 738 // updates is via interrupts. Even then this should be rare or non-existant | |
| 739 // and we don't care that much anyway. | |
| 740 | |
| 741 int index = _jmp_ring_index; | |
| 742 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 743 _jmp_ring[index]._target = (intptr_t) target; | |
| 744 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 745 _jmp_ring[index]._file = file; | |
| 746 _jmp_ring[index]._line = line; | |
| 747 } | |
| 748 #endif /* PRODUCT */ | |
| 749 | |
| 750 // Called by flat profiler | |
| 751 // Callers have already called wait_for_ext_suspend_completion | |
| 752 // The assertion for that is currently too complex to put here: | |
| 753 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 754 bool gotframe = false; | |
| 755 // self suspension saves needed state. | |
| 756 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 757 *_fr = pd_last_frame(); | |
| 758 gotframe = true; | |
| 759 } | |
| 760 return gotframe; | |
| 761 } | |
| 762 | |
| 763 void Thread::interrupt(Thread* thread) { | |
| 764 trace("interrupt", thread); | |
| 765 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 766 os::interrupt(thread); | |
| 767 } | |
| 768 | |
| 769 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 770 trace("is_interrupted", thread); | |
| 771 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 772 // Note: If clear_interrupted==false, this simply fetches and | |
| 773 // returns the value of the field osthread()->interrupted(). | |
| 774 return os::is_interrupted(thread, clear_interrupted); | |
| 775 } | |
| 776 | |
| 777 | |
| 778 // GC Support | |
| 779 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 780 jint thread_parity = _oops_do_parity; | |
| 781 if (thread_parity != strong_roots_parity) { | |
| 782 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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783 if (res == thread_parity) { |
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784 return true; |
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785 } else { |
| 0 | 786 guarantee(res == strong_roots_parity, "Or else what?"); |
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787 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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788 "Should only fail when parallel."); |
| 0 | 789 return false; |
| 790 } | |
| 791 } | |
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792 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 793 "Should only fail when parallel."); |
| 794 return false; | |
| 795 } | |
| 796 | |
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797 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 798 active_handles()->oops_do(f); |
| 799 // Do oop for ThreadShadow | |
| 800 f->do_oop((oop*)&_pending_exception); | |
| 801 handle_area()->oops_do(f); | |
| 802 } | |
| 803 | |
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804 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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805 // no nmethods in a generic thread... |
| 0 | 806 } |
| 807 | |
| 808 void Thread::print_on(outputStream* st) const { | |
| 809 // get_priority assumes osthread initialized | |
| 810 if (osthread() != NULL) { | |
| 811 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 812 osthread()->print_on(st); | |
| 813 } | |
| 814 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 815 } | |
| 816 | |
| 817 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 818 // any lock or allocate memory. | |
| 819 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 820 if (is_VM_thread()) st->print("VMThread"); | |
| 821 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 822 else if (is_Java_thread()) st->print("JavaThread"); | |
| 823 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 824 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 825 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 826 else st->print("Thread"); | |
| 827 | |
| 828 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 829 _stack_base - _stack_size, _stack_base); | |
| 830 | |
| 831 if (osthread()) { | |
| 832 st->print(" [id=%d]", osthread()->thread_id()); | |
| 833 } | |
| 834 } | |
| 835 | |
| 836 #ifdef ASSERT | |
| 837 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 838 Monitor *cur = _owned_locks; | |
| 839 if (cur == NULL) { | |
| 840 st->print(" (no locks) "); | |
| 841 } else { | |
| 842 st->print_cr(" Locks owned:"); | |
| 843 while(cur) { | |
| 844 cur->print_on(st); | |
| 845 cur = cur->next(); | |
| 846 } | |
| 847 } | |
| 848 } | |
| 849 | |
| 850 static int ref_use_count = 0; | |
| 851 | |
| 852 bool Thread::owns_locks_but_compiled_lock() const { | |
| 853 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 854 if (cur != Compile_lock) return true; | |
| 855 } | |
| 856 return false; | |
| 857 } | |
| 858 | |
| 859 | |
| 860 #endif | |
| 861 | |
| 862 #ifndef PRODUCT | |
| 863 | |
| 864 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 865 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 866 // no threads which allow_vm_block's are held | |
| 867 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 868 // Check if current thread is allowed to block at a safepoint | |
| 869 if (!(_allow_safepoint_count == 0)) | |
| 870 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 871 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 872 fatal("LEAF method calling lock?"); | |
| 873 } | |
| 874 | |
| 875 #ifdef ASSERT | |
| 876 if (potential_vm_operation && is_Java_thread() | |
| 877 && !Universe::is_bootstrapping()) { | |
| 878 // Make sure we do not hold any locks that the VM thread also uses. | |
| 879 // This could potentially lead to deadlocks | |
| 880 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 881 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 882 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 883 // since it is used to transfer control between JavaThreads and the VMThread | |
| 884 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 885 if ( (cur->allow_vm_block() && | |
| 886 cur != Threads_lock && | |
| 887 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 888 cur != VMOperationRequest_lock && | |
| 889 cur != VMOperationQueue_lock) || | |
| 890 cur->rank() == Mutex::special) { | |
| 891 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 892 } | |
| 893 } | |
| 894 } | |
| 895 | |
| 896 if (GCALotAtAllSafepoints) { | |
| 897 // We could enter a safepoint here and thus have a gc | |
| 898 InterfaceSupport::check_gc_alot(); | |
| 899 } | |
| 900 #endif | |
| 901 } | |
| 902 #endif | |
| 903 | |
| 904 bool Thread::is_in_stack(address adr) const { | |
| 905 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 906 address end = os::current_stack_pointer(); | |
| 907 if (stack_base() >= adr && adr >= end) return true; | |
| 908 | |
| 909 return false; | |
| 910 } | |
| 911 | |
| 912 | |
| 913 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 914 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 915 // used for compilation in the future. If that change is made, the need for these methods | |
| 916 // should be revisited, and they should be removed if possible. | |
| 917 | |
| 918 bool Thread::is_lock_owned(address adr) const { | |
|
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919 return on_local_stack(adr); |
| 0 | 920 } |
| 921 | |
| 922 bool Thread::set_as_starting_thread() { | |
| 923 // NOTE: this must be called inside the main thread. | |
| 924 return os::create_main_thread((JavaThread*)this); | |
| 925 } | |
| 926 | |
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927 static void initialize_class(Symbol* class_name, TRAPS) { |
| 0 | 928 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
| 929 instanceKlass::cast(klass)->initialize(CHECK); | |
| 930 } | |
| 931 | |
| 932 | |
| 933 // Creates the initial ThreadGroup | |
| 934 static Handle create_initial_thread_group(TRAPS) { | |
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935 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 936 instanceKlassHandle klass (THREAD, k); |
| 937 | |
| 938 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 939 { | |
| 940 JavaValue result(T_VOID); | |
| 941 JavaCalls::call_special(&result, | |
| 942 system_instance, | |
| 943 klass, | |
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944 vmSymbols::object_initializer_name(), |
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945 vmSymbols::void_method_signature(), |
| 0 | 946 CHECK_NH); |
| 947 } | |
| 948 Universe::set_system_thread_group(system_instance()); | |
| 949 | |
| 950 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 951 { | |
| 952 JavaValue result(T_VOID); | |
| 953 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 954 JavaCalls::call_special(&result, | |
| 955 main_instance, | |
| 956 klass, | |
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957 vmSymbols::object_initializer_name(), |
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958 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 959 system_instance, |
| 960 string, | |
| 961 CHECK_NH); | |
| 962 } | |
| 963 return main_instance; | |
| 964 } | |
| 965 | |
| 966 // Creates the initial Thread | |
| 967 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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968 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 969 instanceKlassHandle klass (THREAD, k); |
| 970 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 971 | |
| 972 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 973 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 974 thread->set_threadObj(thread_oop()); | |
| 975 | |
| 976 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 977 | |
| 978 JavaValue result(T_VOID); | |
| 979 JavaCalls::call_special(&result, thread_oop, | |
| 980 klass, | |
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981 vmSymbols::object_initializer_name(), |
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982 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 983 thread_group, |
| 984 string, | |
| 985 CHECK_NULL); | |
| 986 return thread_oop(); | |
| 987 } | |
| 988 | |
| 989 static void call_initializeSystemClass(TRAPS) { | |
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990 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 991 instanceKlassHandle klass (THREAD, k); |
| 992 | |
| 993 JavaValue result(T_VOID); | |
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994 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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995 vmSymbols::void_method_signature(), CHECK); |
| 0 | 996 } |
| 997 | |
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998 // General purpose hook into Java code, run once when the VM is initialized. |
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999 // The Java library method itself may be changed independently from the VM. |
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1000 static void call_postVMInitHook(TRAPS) { |
| 3938 | 1001 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
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1002 instanceKlassHandle klass (THREAD, k); |
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1003 if (klass.not_null()) { |
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1004 JavaValue result(T_VOID); |
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1005 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1006 vmSymbols::void_method_signature(), |
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1007 CHECK); |
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1008 } |
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1009 } |
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1010 |
| 0 | 1011 static void reset_vm_info_property(TRAPS) { |
| 1012 // the vm info string | |
| 1013 ResourceMark rm(THREAD); | |
| 1014 const char *vm_info = VM_Version::vm_info_string(); | |
| 1015 | |
| 1016 // java.lang.System class | |
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1017 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1018 instanceKlassHandle klass (THREAD, k); |
| 1019 | |
| 1020 // setProperty arguments | |
| 1021 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1022 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1023 | |
| 1024 // return value | |
| 1025 JavaValue r(T_OBJECT); | |
| 1026 | |
| 1027 // public static String setProperty(String key, String value); | |
| 1028 JavaCalls::call_static(&r, | |
| 1029 klass, | |
|
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1030 vmSymbols::setProperty_name(), |
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1031 vmSymbols::string_string_string_signature(), |
| 0 | 1032 key_str, |
| 1033 value_str, | |
| 1034 CHECK); | |
| 1035 } | |
| 1036 | |
| 1037 | |
| 1038 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1039 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1040 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1041 | |
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1042 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1043 instanceKlassHandle klass (THREAD, k); |
| 1044 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1045 | |
| 1046 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1047 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1048 set_threadObj(thread_oop()); | |
| 1049 | |
| 1050 JavaValue result(T_VOID); | |
| 1051 if (thread_name != NULL) { | |
| 1052 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1053 // Thread gets assigned specified name and null target | |
| 1054 JavaCalls::call_special(&result, | |
| 1055 thread_oop, | |
| 1056 klass, | |
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1057 vmSymbols::object_initializer_name(), |
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1058 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1059 thread_group, // Argument 1 |
| 1060 name, // Argument 2 | |
| 1061 THREAD); | |
| 1062 } else { | |
| 1063 // Thread gets assigned name "Thread-nnn" and null target | |
| 1064 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1065 JavaCalls::call_special(&result, | |
| 1066 thread_oop, | |
| 1067 klass, | |
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1068 vmSymbols::object_initializer_name(), |
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1069 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1070 thread_group, // Argument 1 |
| 1071 Handle(), // Argument 2 | |
| 1072 THREAD); | |
| 1073 } | |
| 1074 | |
| 1075 | |
| 1076 if (daemon) { | |
| 1077 java_lang_Thread::set_daemon(thread_oop()); | |
| 1078 } | |
| 1079 | |
| 1080 if (HAS_PENDING_EXCEPTION) { | |
| 1081 return; | |
| 1082 } | |
| 1083 | |
| 1142 | 1084 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1085 Handle threadObj(this, this->threadObj()); |
| 1086 | |
| 1087 JavaCalls::call_special(&result, | |
| 1088 thread_group, | |
| 1089 group, | |
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1090 vmSymbols::add_method_name(), |
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1091 vmSymbols::thread_void_signature(), |
| 0 | 1092 threadObj, // Arg 1 |
| 1093 THREAD); | |
| 1094 | |
| 1095 | |
| 1096 } | |
| 1097 | |
| 1098 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1099 // uniquely named instances should derive from this. | |
| 1100 NamedThread::NamedThread() : Thread() { | |
| 1101 _name = NULL; | |
|
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1102 _processed_thread = NULL; |
| 0 | 1103 } |
| 1104 | |
| 1105 NamedThread::~NamedThread() { | |
| 1106 if (_name != NULL) { | |
| 1107 FREE_C_HEAP_ARRAY(char, _name); | |
| 1108 _name = NULL; | |
| 1109 } | |
| 1110 } | |
| 1111 | |
| 1112 void NamedThread::set_name(const char* format, ...) { | |
| 1113 guarantee(_name == NULL, "Only get to set name once."); | |
| 1114 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 1115 guarantee(_name != NULL, "alloc failure"); | |
| 1116 va_list ap; | |
| 1117 va_start(ap, format); | |
| 1118 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1119 va_end(ap); | |
| 1120 } | |
| 1121 | |
| 1122 // ======= WatcherThread ======== | |
| 1123 | |
| 1124 // The watcher thread exists to simulate timer interrupts. It should | |
| 1125 // be replaced by an abstraction over whatever native support for | |
| 1126 // timer interrupts exists on the platform. | |
| 1127 | |
| 1128 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1129 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1130 |
| 1131 WatcherThread::WatcherThread() : Thread() { | |
| 1132 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1133 if (os::create_thread(this, os::watcher_thread)) { | |
| 1134 _watcher_thread = this; | |
| 1135 | |
| 1136 // Set the watcher thread to the highest OS priority which should not be | |
| 1137 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1138 // is created. The only normal thread using this priority is the reference | |
| 1139 // handler thread, which runs for very short intervals only. | |
| 1140 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1141 // will be inaccurate. | |
| 1142 os::set_priority(this, MaxPriority); | |
| 1143 if (!DisableStartThread) { | |
| 1144 os::start_thread(this); | |
| 1145 } | |
| 1146 } | |
| 1147 } | |
| 1148 | |
| 1149 void WatcherThread::run() { | |
| 1150 assert(this == watcher_thread(), "just checking"); | |
| 1151 | |
| 1152 this->record_stack_base_and_size(); | |
| 1153 this->initialize_thread_local_storage(); | |
| 1154 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1155 while(!_should_terminate) { | |
| 1156 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1157 assert(watcher_thread() == this, "thread consistency check"); | |
| 1158 | |
| 1159 // Calculate how long it'll be until the next PeriodicTask work | |
| 1160 // should be done, and sleep that amount of time. | |
|
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1161 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1162 |
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1163 // we expect this to timeout - we only ever get unparked when |
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1164 // we should terminate |
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1165 { |
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1166 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1167 |
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1168 jlong prev_time = os::javaTimeNanos(); |
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1169 for (;;) { |
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1170 int res= _SleepEvent->park(time_to_wait); |
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1171 if (res == OS_TIMEOUT || _should_terminate) |
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1172 break; |
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1173 // spurious wakeup of some kind |
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1174 jlong now = os::javaTimeNanos(); |
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1175 time_to_wait -= (now - prev_time) / 1000000; |
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1176 if (time_to_wait <= 0) |
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1177 break; |
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1178 prev_time = now; |
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1179 } |
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1180 } |
| 0 | 1181 |
| 1182 if (is_error_reported()) { | |
| 1183 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1184 // should abort JVM after creating an error log file. However in some | |
| 1185 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1186 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1187 // | |
| 1188 // This code is in WatcherThread because WatcherThread wakes up | |
| 1189 // periodically so the fatal error handler doesn't need to do anything; | |
| 1190 // also because the WatcherThread is less likely to crash than other | |
| 1191 // threads. | |
| 1192 | |
| 1193 for (;;) { | |
| 1194 if (!ShowMessageBoxOnError | |
| 1195 && (OnError == NULL || OnError[0] == '\0') | |
| 1196 && Arguments::abort_hook() == NULL) { | |
| 1197 os::sleep(this, 2 * 60 * 1000, false); | |
| 1198 fdStream err(defaultStream::output_fd()); | |
| 1199 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1200 // skip atexit/vm_exit/vm_abort hooks | |
| 1201 os::die(); | |
| 1202 } | |
| 1203 | |
| 1204 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1205 // ShowMessageBoxOnError when it is ready to abort. | |
| 1206 os::sleep(this, 5 * 1000, false); | |
| 1207 } | |
| 1208 } | |
| 1209 | |
| 1210 PeriodicTask::real_time_tick(time_to_wait); | |
| 1211 | |
| 1212 // If we have no more tasks left due to dynamic disenrollment, | |
| 1213 // shut down the thread since we don't currently support dynamic enrollment | |
| 1214 if (PeriodicTask::num_tasks() == 0) { | |
| 1215 _should_terminate = true; | |
| 1216 } | |
| 1217 } | |
| 1218 | |
| 1219 // Signal that it is terminated | |
| 1220 { | |
| 1221 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1222 _watcher_thread = NULL; | |
| 1223 Terminator_lock->notify(); | |
| 1224 } | |
| 1225 | |
| 1226 // Thread destructor usually does this.. | |
| 1227 ThreadLocalStorage::set_thread(NULL); | |
| 1228 } | |
| 1229 | |
| 1230 void WatcherThread::start() { | |
| 1231 if (watcher_thread() == NULL) { | |
| 1232 _should_terminate = false; | |
| 1233 // Create the single instance of WatcherThread | |
| 1234 new WatcherThread(); | |
| 1235 } | |
| 1236 } | |
| 1237 | |
| 1238 void WatcherThread::stop() { | |
| 1239 // it is ok to take late safepoints here, if needed | |
| 1240 MutexLocker mu(Terminator_lock); | |
| 1241 _should_terminate = true; | |
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1242 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1243 |
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1244 Thread* watcher = watcher_thread(); |
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1245 if (watcher != NULL) |
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1246 watcher->_SleepEvent->unpark(); |
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1247 |
| 0 | 1248 while(watcher_thread() != NULL) { |
| 1249 // This wait should make safepoint checks, wait without a timeout, | |
| 1250 // and wait as a suspend-equivalent condition. | |
| 1251 // | |
| 1252 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1253 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1254 // FlatProfiler task, is waiting for the external suspend request on | |
| 1255 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1256 // eventually timeout, but that takes time. Making this wait a | |
| 1257 // suspend-equivalent condition solves that timeout problem. | |
| 1258 // | |
| 1259 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1260 Mutex::_as_suspend_equivalent_flag); | |
| 1261 } | |
| 1262 } | |
| 1263 | |
| 1264 void WatcherThread::print_on(outputStream* st) const { | |
| 1265 st->print("\"%s\" ", name()); | |
| 1266 Thread::print_on(st); | |
| 1267 st->cr(); | |
| 1268 } | |
| 1269 | |
| 1270 // ======= JavaThread ======== | |
| 1271 | |
| 1272 // A JavaThread is a normal Java thread | |
| 1273 | |
| 1274 void JavaThread::initialize() { | |
| 1275 // Initialize fields | |
|
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1276 |
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1277 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1278 set_claimed_par_id(-1); |
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1279 |
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1280 _env = NULL; |
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1281 _buffer_blob = NULL; |
| 0 | 1282 set_saved_exception_pc(NULL); |
| 1283 set_threadObj(NULL); | |
| 1284 _anchor.clear(); | |
| 1285 set_entry_point(NULL); | |
| 1286 set_jni_functions(jni_functions()); | |
| 1287 set_callee_target(NULL); | |
| 1288 set_vm_result(NULL); | |
| 1289 set_vm_result_2(NULL); | |
| 1290 set_vframe_array_head(NULL); | |
| 1291 set_vframe_array_last(NULL); | |
| 1292 set_deferred_locals(NULL); | |
| 1293 set_deopt_mark(NULL); | |
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1294 set_deopt_nmethod(NULL); |
| 0 | 1295 clear_must_deopt_id(); |
| 1296 set_monitor_chunks(NULL); | |
| 1297 set_next(NULL); | |
| 1298 set_thread_state(_thread_new); | |
| 1299 _terminated = _not_terminated; | |
| 1300 _privileged_stack_top = NULL; | |
| 1301 _array_for_gc = NULL; | |
| 1302 _suspend_equivalent = false; | |
| 1303 _in_deopt_handler = 0; | |
| 1304 _doing_unsafe_access = false; | |
| 1305 _stack_guard_state = stack_guard_unused; | |
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1306 _graal_deopt_info = NULL; |
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1307 _graal_alternate_call_target = NULL; |
| 0 | 1308 _exception_oop = NULL; |
| 1309 _exception_pc = 0; | |
| 1310 _exception_handler_pc = 0; | |
| 1903 | 1311 _is_method_handle_return = 0; |
| 0 | 1312 _jvmti_thread_state= NULL; |
|
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1313 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1314 _jvmti_get_loaded_classes_closure = NULL; |
| 1315 _interp_only_mode = 0; | |
| 1316 _special_runtime_exit_condition = _no_async_condition; | |
| 1317 _pending_async_exception = NULL; | |
| 1318 _is_compiling = false; | |
| 1319 _thread_stat = NULL; | |
| 1320 _thread_stat = new ThreadStatistics(); | |
| 1321 _blocked_on_compilation = false; | |
| 1322 _jni_active_critical = 0; | |
| 1323 _do_not_unlock_if_synchronized = false; | |
| 1324 _cached_monitor_info = NULL; | |
| 1325 _parker = Parker::Allocate(this) ; | |
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1326 _scanned_nmethod = NULL; |
| 0 | 1327 |
| 1328 #ifndef PRODUCT | |
| 1329 _jmp_ring_index = 0; | |
| 1330 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1331 record_jump(NULL, NULL, NULL, 0); | |
| 1332 } | |
| 1333 #endif /* PRODUCT */ | |
| 1334 | |
| 1335 set_thread_profiler(NULL); | |
| 1336 if (FlatProfiler::is_active()) { | |
| 1337 // This is where we would decide to either give each thread it's own profiler | |
| 1338 // or use one global one from FlatProfiler, | |
| 1339 // or up to some count of the number of profiled threads, etc. | |
| 1340 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1341 pp->engage(); | |
| 1342 set_thread_profiler(pp); | |
| 1343 } | |
| 1344 | |
| 1345 // Setup safepoint state info for this thread | |
| 1346 ThreadSafepointState::create(this); | |
| 1347 | |
| 1348 debug_only(_java_call_counter = 0); | |
| 1349 | |
| 1350 // JVMTI PopFrame support | |
| 1351 _popframe_condition = popframe_inactive; | |
| 1352 _popframe_preserved_args = NULL; | |
| 1353 _popframe_preserved_args_size = 0; | |
| 1354 | |
| 1355 pd_initialize(); | |
| 1356 } | |
| 1357 | |
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1358 #ifndef SERIALGC |
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1359 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1360 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1361 #endif // !SERIALGC |
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1362 |
| 4006 | 1363 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1364 Thread() |
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1365 #ifndef SERIALGC |
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1366 , _satb_mark_queue(&_satb_mark_queue_set), |
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1367 _dirty_card_queue(&_dirty_card_queue_set) |
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1368 #endif // !SERIALGC |
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1369 { |
| 0 | 1370 initialize(); |
| 4006 | 1371 if (is_attaching_via_jni) { |
| 1372 _jni_attach_state = _attaching_via_jni; | |
| 1373 } else { | |
| 1374 _jni_attach_state = _not_attaching_via_jni; | |
| 1375 } | |
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1376 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 0 | 1377 } |
| 1378 | |
| 1379 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1380 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1381 return true; // Stack already guarded or guard pages not needed. | |
| 1382 } | |
| 1383 | |
| 1384 if (register_stack_overflow()) { | |
| 1385 // For those architectures which have separate register and | |
| 1386 // memory stacks, we must check the register stack to see if | |
| 1387 // it has overflowed. | |
| 1388 return false; | |
| 1389 } | |
| 1390 | |
| 1391 // Java code never executes within the yellow zone: the latter is only | |
| 1392 // there to provoke an exception during stack banging. If java code | |
| 1393 // is executing there, either StackShadowPages should be larger, or | |
| 1394 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1395 // when it should. | |
| 1396 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1397 | |
| 1398 enable_stack_yellow_zone(); | |
| 1399 return true; | |
| 1400 } | |
| 1401 | |
| 1402 bool JavaThread::reguard_stack(void) { | |
| 1403 return reguard_stack(os::current_stack_pointer()); | |
| 1404 } | |
| 1405 | |
| 1406 | |
| 1407 void JavaThread::block_if_vm_exited() { | |
| 1408 if (_terminated == _vm_exited) { | |
| 1409 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1410 // we will block here forever | |
| 1411 Threads_lock->lock_without_safepoint_check(); | |
| 1412 ShouldNotReachHere(); | |
| 1413 } | |
| 1414 } | |
| 1415 | |
| 1416 | |
| 1417 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1418 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1419 | |
|
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1420 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1421 Thread() |
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1422 #ifndef SERIALGC |
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1423 , _satb_mark_queue(&_satb_mark_queue_set), |
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1424 _dirty_card_queue(&_dirty_card_queue_set) |
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1425 #endif // !SERIALGC |
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1426 { |
| 0 | 1427 if (TraceThreadEvents) { |
| 1428 tty->print_cr("creating thread %p", this); | |
| 1429 } | |
| 1430 initialize(); | |
| 4006 | 1431 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1432 set_entry_point(entry_point); |
| 1433 // Create the native thread itself. | |
| 1434 // %note runtime_23 | |
| 1435 os::ThreadType thr_type = os::java_thread; | |
| 1436 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1437 os::java_thread; | |
| 1438 os::create_thread(this, thr_type, stack_sz); | |
| 1439 | |
| 1440 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1441 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1442 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1443 // the exception consists of creating the exception object & initializing it, initialization | |
| 1444 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1445 // | |
| 1446 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1447 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1448 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1449 // object must be fully initialized (take a look at JVM_Start) | |
| 1450 } | |
| 1451 | |
| 1452 JavaThread::~JavaThread() { | |
| 1453 if (TraceThreadEvents) { | |
| 1454 tty->print_cr("terminate thread %p", this); | |
| 1455 } | |
| 1456 | |
| 1457 // JSR166 -- return the parker to the free list | |
| 1458 Parker::Release(_parker); | |
| 1459 _parker = NULL ; | |
| 1460 | |
| 1461 // Free any remaining previous UnrollBlock | |
| 1462 vframeArray* old_array = vframe_array_last(); | |
| 1463 | |
| 1464 if (old_array != NULL) { | |
| 1465 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1466 old_array->set_unroll_block(NULL); | |
| 1467 delete old_info; | |
| 1468 delete old_array; | |
| 1469 } | |
| 1470 | |
| 1471 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1472 if (deferred != NULL) { | |
| 1473 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1474 assert(deferred->length() != 0, "empty array!"); | |
| 1475 do { | |
| 1476 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1477 deferred->remove_at(0); | |
| 1478 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1479 delete dlv; | |
| 1480 } while (deferred->length() != 0); | |
| 1481 delete deferred; | |
| 1482 } | |
| 1483 | |
| 1484 // All Java related clean up happens in exit | |
| 1485 ThreadSafepointState::destroy(this); | |
| 1486 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1487 if (_thread_stat != NULL) delete _thread_stat; | |
| 1488 } | |
| 1489 | |
| 1490 | |
| 1491 // The first routine called by a new Java thread | |
| 1492 void JavaThread::run() { | |
| 1493 // initialize thread-local alloc buffer related fields | |
| 1494 this->initialize_tlab(); | |
| 1495 | |
| 1496 // used to test validitity of stack trace backs | |
| 1497 this->record_base_of_stack_pointer(); | |
| 1498 | |
| 1499 // Record real stack base and size. | |
| 1500 this->record_stack_base_and_size(); | |
| 1501 | |
| 1502 // Initialize thread local storage; set before calling MutexLocker | |
| 1503 this->initialize_thread_local_storage(); | |
| 1504 | |
| 1505 this->create_stack_guard_pages(); | |
| 1506 | |
|
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1507 this->cache_global_variables(); |
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1508 |
| 0 | 1509 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1510 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1511 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1512 | |
| 1513 assert(JavaThread::current() == this, "sanity check"); | |
| 1514 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1515 | |
| 1516 DTRACE_THREAD_PROBE(start, this); | |
| 1517 | |
| 1518 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1519 // been completed. | |
| 1520 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1521 | |
| 1522 if (JvmtiExport::should_post_thread_life()) { | |
| 1523 JvmtiExport::post_thread_start(this); | |
| 1524 } | |
| 1525 | |
|
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1526 EVENT_BEGIN(TraceEventThreadStart, event); |
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1527 EVENT_COMMIT(event, |
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1528 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1529 |
| 0 | 1530 // We call another function to do the rest so we are sure that the stack addresses used |
| 1531 // from there will be lower than the stack base just computed | |
| 1532 thread_main_inner(); | |
| 1533 | |
| 1534 // Note, thread is no longer valid at this point! | |
| 1535 } | |
| 1536 | |
| 1537 | |
| 1538 void JavaThread::thread_main_inner() { | |
| 1539 assert(JavaThread::current() == this, "sanity check"); | |
| 1540 assert(this->threadObj() != NULL, "just checking"); | |
| 1541 | |
|
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1542 // Execute thread entry point unless this thread has a pending exception |
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1543 // or has been stopped before starting. |
| 0 | 1544 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1545 if (!this->has_pending_exception() && |
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1546 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1547 { |
| 1548 ResourceMark rm(this); | |
| 1549 this->set_native_thread_name(this->get_thread_name()); | |
| 1550 } | |
| 0 | 1551 HandleMark hm(this); |
| 1552 this->entry_point()(this, this); | |
| 1553 } | |
| 1554 | |
| 1555 DTRACE_THREAD_PROBE(stop, this); | |
| 1556 | |
| 1557 this->exit(false); | |
| 1558 delete this; | |
| 1559 } | |
| 1560 | |
| 1561 | |
| 1562 static void ensure_join(JavaThread* thread) { | |
| 1563 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1564 Handle threadObj(thread, thread->threadObj()); | |
| 1565 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1566 ObjectLocker lock(threadObj, thread); | |
| 1567 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1568 thread->clear_pending_exception(); | |
| 1569 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1570 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1571 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1572 // to complete once we've done the notify_all below |
| 0 | 1573 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1574 lock.notify_all(thread); | |
| 1575 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1576 thread->clear_pending_exception(); | |
| 1577 } | |
| 1578 | |
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1579 |
| 0 | 1580 // For any new cleanup additions, please check to see if they need to be applied to |
| 1581 // cleanup_failed_attach_current_thread as well. | |
| 1582 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1583 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1584 if (!InitializeJavaLangSystem) return; | |
| 1585 | |
| 1586 HandleMark hm(this); | |
| 1587 Handle uncaught_exception(this, this->pending_exception()); | |
| 1588 this->clear_pending_exception(); | |
| 1589 Handle threadObj(this, this->threadObj()); | |
| 1590 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1591 | |
| 1592 if (get_thread_profiler() != NULL) { | |
| 1593 get_thread_profiler()->disengage(); | |
| 1594 ResourceMark rm; | |
| 1595 get_thread_profiler()->print(get_thread_name()); | |
| 1596 } | |
| 1597 | |
| 1598 | |
| 1599 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1600 { | |
| 1601 EXCEPTION_MARK; | |
| 1602 | |
| 1603 CLEAR_PENDING_EXCEPTION; | |
| 1604 } | |
| 1605 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1606 // has to be fixed by a runtime query method | |
| 1607 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1608 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1609 // java.lang.Thread.dispatchUncaughtException | |
| 1610 if (uncaught_exception.not_null()) { | |
| 1611 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1612 { | |
| 1613 EXCEPTION_MARK; | |
| 1614 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1615 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1616 // so call ThreadGroup.uncaughtException() | |
| 1617 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1618 CallInfo callinfo; | |
| 1142 | 1619 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1620 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1621 vmSymbols::dispatchUncaughtException_name(), |
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1622 vmSymbols::throwable_void_signature(), |
| 0 | 1623 KlassHandle(), false, false, THREAD); |
| 1624 CLEAR_PENDING_EXCEPTION; | |
| 1625 methodHandle method = callinfo.selected_method(); | |
| 1626 if (method.not_null()) { | |
| 1627 JavaValue result(T_VOID); | |
| 1628 JavaCalls::call_virtual(&result, | |
| 1629 threadObj, thread_klass, | |
|
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1630 vmSymbols::dispatchUncaughtException_name(), |
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1631 vmSymbols::throwable_void_signature(), |
| 0 | 1632 uncaught_exception, |
| 1633 THREAD); | |
| 1634 } else { | |
| 1142 | 1635 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1636 JavaValue result(T_VOID); |
| 1637 JavaCalls::call_virtual(&result, | |
| 1638 group, thread_group, | |
|
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1639 vmSymbols::uncaughtException_name(), |
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1640 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1641 threadObj, // Arg 1 |
| 1642 uncaught_exception, // Arg 2 | |
| 1643 THREAD); | |
| 1644 } | |
|
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1645 if (HAS_PENDING_EXCEPTION) { |
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1646 ResourceMark rm(this); |
|
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1647 jio_fprintf(defaultStream::error_stream(), |
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1648 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1649 " in thread \"%s\"\n", |
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1650 Klass::cast(pending_exception()->klass())->external_name(), |
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1651 get_thread_name()); |
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1652 CLEAR_PENDING_EXCEPTION; |
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1653 } |
| 0 | 1654 } |
| 1655 } | |
| 1656 | |
|
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1657 // Called before the java thread exit since we want to read info |
|
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1658 // from java_lang_Thread object |
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1659 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1660 EVENT_COMMIT(event, |
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1661 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
|
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1662 |
|
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1663 // Call after last event on thread |
|
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1664 EVENT_THREAD_EXIT(this); |
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1665 |
| 0 | 1666 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1667 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1668 // is deprecated anyhow. | |
| 1669 { int count = 3; | |
| 1670 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1671 EXCEPTION_MARK; | |
| 1672 JavaValue result(T_VOID); | |
| 1142 | 1673 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1674 JavaCalls::call_virtual(&result, |
| 1675 threadObj, thread_klass, | |
|
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1676 vmSymbols::exit_method_name(), |
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1677 vmSymbols::void_method_signature(), |
| 0 | 1678 THREAD); |
| 1679 CLEAR_PENDING_EXCEPTION; | |
| 1680 } | |
| 1681 } | |
| 1682 | |
| 1683 // notify JVMTI | |
| 1684 if (JvmtiExport::should_post_thread_life()) { | |
| 1685 JvmtiExport::post_thread_end(this); | |
| 1686 } | |
| 1687 | |
| 1688 // We have notified the agents that we are exiting, before we go on, | |
| 1689 // we must check for a pending external suspend request and honor it | |
| 1690 // in order to not surprise the thread that made the suspend request. | |
| 1691 while (true) { | |
| 1692 { | |
| 1693 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1694 if (!is_external_suspend()) { | |
| 1695 set_terminated(_thread_exiting); | |
| 1696 ThreadService::current_thread_exiting(this); | |
| 1697 break; | |
| 1698 } | |
| 1699 // Implied else: | |
| 1700 // Things get a little tricky here. We have a pending external | |
| 1701 // suspend request, but we are holding the SR_lock so we | |
| 1702 // can't just self-suspend. So we temporarily drop the lock | |
| 1703 // and then self-suspend. | |
| 1704 } | |
| 1705 | |
| 1706 ThreadBlockInVM tbivm(this); | |
| 1707 java_suspend_self(); | |
| 1708 | |
| 1709 // We're done with this suspend request, but we have to loop around | |
| 1710 // and check again. Eventually we will get SR_lock without a pending | |
| 1711 // external suspend request and will be able to mark ourselves as | |
| 1712 // exiting. | |
| 1713 } | |
| 1714 // no more external suspends are allowed at this point | |
| 1715 } else { | |
| 1716 // before_exit() has already posted JVMTI THREAD_END events | |
| 1717 } | |
| 1718 | |
| 1719 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1720 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1721 // group should have the destroyed bit set before waiters are notified). | |
| 1722 ensure_join(this); | |
| 1723 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1724 | |
| 1725 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1726 // held by this thread must be released. A detach operation must only | |
| 1727 // get here if there are no Java frames on the stack. Therefore, any | |
| 1728 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1729 // pre-inflated and in the monitor cache. | |
| 1730 // | |
| 1731 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1732 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1733 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1734 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1735 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1736 } | |
| 1737 | |
| 1738 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1739 // is in a consistent state, in case GC happens | |
| 1740 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1741 | |
| 1742 if (active_handles() != NULL) { | |
| 1743 JNIHandleBlock* block = active_handles(); | |
| 1744 set_active_handles(NULL); | |
| 1745 JNIHandleBlock::release_block(block); | |
| 1746 } | |
| 1747 | |
| 1748 if (free_handle_block() != NULL) { | |
| 1749 JNIHandleBlock* block = free_handle_block(); | |
| 1750 set_free_handle_block(NULL); | |
| 1751 JNIHandleBlock::release_block(block); | |
| 1752 } | |
| 1753 | |
| 1754 // These have to be removed while this is still a valid thread. | |
| 1755 remove_stack_guard_pages(); | |
| 1756 | |
| 1757 if (UseTLAB) { | |
| 1758 tlab().make_parsable(true); // retire TLAB | |
| 1759 } | |
| 1760 | |
|
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1761 if (JvmtiEnv::environments_might_exist()) { |
|
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1762 JvmtiExport::cleanup_thread(this); |
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1763 } |
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1764 |
|
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1765 #ifndef SERIALGC |
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1766 // We must flush G1-related buffers before removing a thread from |
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1767 // the list of active threads. |
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1768 if (UseG1GC) { |
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1769 flush_barrier_queues(); |
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1770 } |
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1771 #endif |
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1772 |
| 0 | 1773 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1774 Threads::remove(this); | |
| 1775 } | |
| 1776 | |
|
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1777 #ifndef SERIALGC |
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1778 // Flush G1-related queues. |
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1779 void JavaThread::flush_barrier_queues() { |
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1780 satb_mark_queue().flush(); |
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1781 dirty_card_queue().flush(); |
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1782 } |
|
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1783 |
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1784 void JavaThread::initialize_queues() { |
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|
1785 assert(!SafepointSynchronize::is_at_safepoint(), |
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1786 "we should not be at a safepoint"); |
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1787 |
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1788 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1789 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1790 // The SATB queue should have been constructed with its active |
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1791 // field set to false. |
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|
1792 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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|
1793 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1794 // If we are creating the thread during a marking cycle, we should |
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1795 // set the active field of the SATB queue to true. |
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1796 if (satb_queue_set.is_active()) { |
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1797 satb_queue.set_active(true); |
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1798 } |
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1799 |
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1800 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1801 // The dirty card queue should have been constructed with its |
|
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1802 // active field set to true. |
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1803 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1804 } |
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1805 #endif // !SERIALGC |
|
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1806 |
| 0 | 1807 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1808 if (get_thread_profiler() != NULL) { |
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1809 get_thread_profiler()->disengage(); |
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1810 ResourceMark rm; |
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1811 get_thread_profiler()->print(get_thread_name()); |
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1812 } |
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1813 |
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1814 if (active_handles() != NULL) { |
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1815 JNIHandleBlock* block = active_handles(); |
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1816 set_active_handles(NULL); |
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1817 JNIHandleBlock::release_block(block); |
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1818 } |
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1819 |
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1820 if (free_handle_block() != NULL) { |
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1821 JNIHandleBlock* block = free_handle_block(); |
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1822 set_free_handle_block(NULL); |
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1823 JNIHandleBlock::release_block(block); |
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1824 } |
|
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1825 |
|
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1826 // These have to be removed while this is still a valid thread. |
|
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1827 remove_stack_guard_pages(); |
|
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1828 |
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1829 if (UseTLAB) { |
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1830 tlab().make_parsable(true); // retire TLAB, if any |
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1831 } |
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1832 |
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1833 #ifndef SERIALGC |
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1834 if (UseG1GC) { |
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1835 flush_barrier_queues(); |
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1836 } |
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1837 #endif |
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1838 |
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1839 Threads::remove(this); |
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1840 delete this; |
| 0 | 1841 } |
| 1842 | |
| 1843 | |
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1844 |
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1845 |
| 0 | 1846 JavaThread* JavaThread::active() { |
| 1847 Thread* thread = ThreadLocalStorage::thread(); | |
| 1848 assert(thread != NULL, "just checking"); | |
| 1849 if (thread->is_Java_thread()) { | |
| 1850 return (JavaThread*) thread; | |
| 1851 } else { | |
| 1852 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1853 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1854 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1855 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1856 return ret; | |
| 1857 } | |
| 1858 } | |
| 1859 | |
| 1860 bool JavaThread::is_lock_owned(address adr) const { | |
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1861 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1862 |
| 1863 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1864 if (chunk->contains(adr)) return true; | |
| 1865 } | |
| 1866 | |
| 1867 return false; | |
| 1868 } | |
| 1869 | |
| 1870 | |
| 1871 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1872 chunk->set_next(monitor_chunks()); | |
| 1873 set_monitor_chunks(chunk); | |
| 1874 } | |
| 1875 | |
| 1876 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1877 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1878 if (monitor_chunks() == chunk) { | |
| 1879 set_monitor_chunks(chunk->next()); | |
| 1880 } else { | |
| 1881 MonitorChunk* prev = monitor_chunks(); | |
| 1882 while (prev->next() != chunk) prev = prev->next(); | |
| 1883 prev->set_next(chunk->next()); | |
| 1884 } | |
| 1885 } | |
| 1886 | |
| 1887 // JVM support. | |
| 1888 | |
| 1889 // Note: this function shouldn't block if it's called in | |
| 1890 // _thread_in_native_trans state (such as from | |
| 1891 // check_special_condition_for_native_trans()). | |
| 1892 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1893 | |
| 1894 if (has_last_Java_frame() && has_async_condition()) { | |
| 1895 // If we are at a polling page safepoint (not a poll return) | |
| 1896 // then we must defer async exception because live registers | |
| 1897 // will be clobbered by the exception path. Poll return is | |
| 1898 // ok because the call we a returning from already collides | |
| 1899 // with exception handling registers and so there is no issue. | |
| 1900 // (The exception handling path kills call result registers but | |
| 1901 // this is ok since the exception kills the result anyway). | |
| 1902 | |
| 1903 if (is_at_poll_safepoint()) { | |
| 1904 // if the code we are returning to has deoptimized we must defer | |
| 1905 // the exception otherwise live registers get clobbered on the | |
| 1906 // exception path before deoptimization is able to retrieve them. | |
| 1907 // | |
| 1908 RegisterMap map(this, false); | |
| 1909 frame caller_fr = last_frame().sender(&map); | |
| 1910 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1911 if (caller_fr.is_deoptimized_frame()) { | |
| 1912 if (TraceExceptions) { | |
| 1913 ResourceMark rm; | |
| 1914 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1915 } | |
| 1916 return; | |
| 1917 } | |
| 1918 } | |
| 1919 } | |
| 1920 | |
| 1921 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1922 if (condition == _no_async_condition) { | |
| 1923 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1924 // was called: | |
| 1925 // - if we were here only because of an external suspend request, | |
| 1926 // then that was taken care of above (or cancelled) so we are done | |
| 1927 // - if we were here because of another async request, then it has | |
| 1928 // been cleared between the has_special_runtime_exit_condition() | |
| 1929 // and now so again we are done | |
| 1930 return; | |
| 1931 } | |
| 1932 | |
| 1933 // Check for pending async. exception | |
| 1934 if (_pending_async_exception != NULL) { | |
| 1935 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 1936 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 1937 |
| 1938 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1939 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1940 | |
| 1941 if (TraceExceptions) { | |
| 1942 ResourceMark rm; | |
| 1943 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1944 if (has_last_Java_frame() ) { | |
| 1945 frame f = last_frame(); | |
| 1946 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1947 } | |
| 1948 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1949 } | |
| 1950 _pending_async_exception = NULL; | |
| 1951 clear_has_async_exception(); | |
| 1952 } | |
| 1953 } | |
| 1954 | |
| 1955 if (check_unsafe_error && | |
| 1956 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1957 condition = _no_async_condition; // done | |
| 1958 switch (thread_state()) { | |
| 1959 case _thread_in_vm: | |
| 1960 { | |
| 1961 JavaThread* THREAD = this; | |
| 1962 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1963 } | |
| 1964 case _thread_in_native: | |
| 1965 { | |
| 1966 ThreadInVMfromNative tiv(this); | |
| 1967 JavaThread* THREAD = this; | |
| 1968 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1969 } | |
| 1970 case _thread_in_Java: | |
| 1971 { | |
| 1972 ThreadInVMfromJava tiv(this); | |
| 1973 JavaThread* THREAD = this; | |
| 1974 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1975 } | |
| 1976 default: | |
| 1977 ShouldNotReachHere(); | |
| 1978 } | |
| 1979 } | |
| 1980 | |
| 1981 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1982 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1983 "must have handled the async condition, if no exception"); | |
| 1984 } | |
| 1985 | |
| 1986 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1987 // | |
| 1988 // Check for pending external suspend. Internal suspend requests do | |
| 1989 // not use handle_special_runtime_exit_condition(). | |
| 1990 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1991 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1992 // threads could call into the VM with another thread's JNIEnv so we | |
| 1993 // can be here operating on behalf of a suspended thread (4432884). | |
| 1994 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1995 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1996 // | |
| 1997 // Because thread is external suspended the safepoint code will count | |
| 1998 // thread as at a safepoint. This can be odd because we can be here | |
| 1999 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2000 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2001 // before calling java_suspend_self like all other callers of it but | |
| 2002 // we must then observe proper safepoint protocol. (We can't leave | |
| 2003 // _thread_blocked with a safepoint in progress). However we can be | |
| 2004 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2005 // constructor/destructor pair because they assert on that type of | |
| 2006 // transition. We could do something like: | |
| 2007 // | |
| 2008 // JavaThreadState state = thread_state(); | |
| 2009 // set_thread_state(_thread_in_vm); | |
| 2010 // { | |
| 2011 // ThreadBlockInVM tbivm(this); | |
| 2012 // java_suspend_self() | |
| 2013 // } | |
| 2014 // set_thread_state(_thread_in_vm_trans); | |
| 2015 // if (safepoint) block; | |
| 2016 // set_thread_state(state); | |
| 2017 // | |
| 2018 // but that is pretty messy. Instead we just go with the way the | |
| 2019 // code has worked before and note that this is the only path to | |
| 2020 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2021 // mode. | |
| 2022 | |
| 2023 frame_anchor()->make_walkable(this); | |
| 2024 java_suspend_self(); | |
| 2025 | |
| 2026 // We might be here for reasons in addition to the self-suspend request | |
| 2027 // so check for other async requests. | |
| 2028 } | |
| 2029 | |
| 2030 if (check_asyncs) { | |
| 2031 check_and_handle_async_exceptions(); | |
| 2032 } | |
| 2033 } | |
| 2034 | |
| 2035 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2036 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2037 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2038 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2039 | |
| 2040 // Do not throw asynchronous exceptions against the compiler thread | |
| 2041 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
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2042 |
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2043 // (thomaswue) May we do this? |
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2044 //if (is_Compiler_thread()) return; |
| 0 | 2045 |
| 2046 { | |
| 2047 // Actually throw the Throwable against the target Thread - however | |
| 2048 // only if there is no thread death exception installed already. | |
| 1142 | 2049 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2050 // If the topmost frame is a runtime stub, then we are calling into |
| 2051 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2052 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2053 // may not be valid | |
| 2054 if (has_last_Java_frame()) { | |
| 2055 frame f = last_frame(); | |
| 2056 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2057 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2058 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2059 frame compiled_frame = f.sender(®_map); | |
| 2060 if (compiled_frame.can_be_deoptimized()) { | |
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2061 Deoptimization::deoptimize(this, compiled_frame, ®_map, Deoptimization::Reason_constraint); |
| 0 | 2062 } |
| 2063 } | |
| 2064 } | |
| 2065 | |
| 2066 // Set async. pending exception in thread. | |
| 2067 set_pending_async_exception(java_throwable); | |
| 2068 | |
| 2069 if (TraceExceptions) { | |
| 2070 ResourceMark rm; | |
| 2071 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 2072 } | |
| 2073 // for AbortVMOnException flag | |
| 2074 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 2075 } | |
| 2076 } | |
| 2077 | |
| 2078 | |
| 2079 // Interrupt thread so it will wake up from a potential wait() | |
| 2080 Thread::interrupt(this); | |
| 2081 } | |
| 2082 | |
| 2083 // External suspension mechanism. | |
| 2084 // | |
| 2085 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2086 // to any VM_locks and it is at a transition | |
| 2087 // Self-suspension will happen on the transition out of the vm. | |
| 2088 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2089 // | |
| 2090 // Guarantees on return: | |
| 2091 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2092 // force a safepoint) | |
| 2093 // + Target thread will not enter any new monitors | |
| 2094 // | |
| 2095 void JavaThread::java_suspend() { | |
| 2096 { MutexLocker mu(Threads_lock); | |
| 2097 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2098 return; | |
| 2099 } | |
| 2100 } | |
| 2101 | |
| 2102 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2103 if (!is_external_suspend()) { | |
| 2104 // a racing resume has cancelled us; bail out now | |
| 2105 return; | |
| 2106 } | |
| 2107 | |
| 2108 // suspend is done | |
| 2109 uint32_t debug_bits = 0; | |
| 2110 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2111 // SR_lock to allow the thread to reach a stable thread state if | |
| 2112 // it is currently in a transient thread state. | |
| 2113 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2114 SuspendRetryDelay, &debug_bits) ) { | |
| 2115 return; | |
| 2116 } | |
| 2117 } | |
| 2118 | |
| 2119 VM_ForceSafepoint vm_suspend; | |
| 2120 VMThread::execute(&vm_suspend); | |
| 2121 } | |
| 2122 | |
| 2123 // Part II of external suspension. | |
| 2124 // A JavaThread self suspends when it detects a pending external suspend | |
| 2125 // request. This is usually on transitions. It is also done in places | |
| 2126 // where continuing to the next transition would surprise the caller, | |
| 2127 // e.g., monitor entry. | |
| 2128 // | |
| 2129 // Returns the number of times that the thread self-suspended. | |
| 2130 // | |
| 2131 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2132 // thread. java_suspend_self() is the second stage of cooperative | |
| 2133 // suspension for external suspend requests and should only be used | |
| 2134 // to complete an external suspend request. | |
| 2135 // | |
| 2136 int JavaThread::java_suspend_self() { | |
| 2137 int ret = 0; | |
| 2138 | |
| 2139 // we are in the process of exiting so don't suspend | |
| 2140 if (is_exiting()) { | |
| 2141 clear_external_suspend(); | |
| 2142 return ret; | |
| 2143 } | |
| 2144 | |
| 2145 assert(_anchor.walkable() || | |
| 2146 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2147 "must have walkable stack"); | |
| 2148 | |
| 2149 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2150 | |
| 979 | 2151 assert(!this->is_ext_suspended(), |
| 0 | 2152 "a thread trying to self-suspend should not already be suspended"); |
| 2153 | |
| 2154 if (this->is_suspend_equivalent()) { | |
| 2155 // If we are self-suspending as a result of the lifting of a | |
| 2156 // suspend equivalent condition, then the suspend_equivalent | |
| 2157 // flag is not cleared until we set the ext_suspended flag so | |
| 2158 // that wait_for_ext_suspend_completion() returns consistent | |
| 2159 // results. | |
| 2160 this->clear_suspend_equivalent(); | |
| 2161 } | |
| 2162 | |
| 2163 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2164 // above. Or another external suspend request could be waiting for us | |
| 2165 // by the time we return from SR_lock()->wait(). The thread | |
| 2166 // that requested the suspension may already be trying to walk our | |
| 2167 // stack and if we return now, we can change the stack out from under | |
| 2168 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2169 // to crash. We stay self-suspended until there are no more pending | |
| 2170 // external suspend requests. | |
| 2171 while (is_external_suspend()) { | |
| 2172 ret++; | |
| 2173 this->set_ext_suspended(); | |
| 2174 | |
| 2175 // _ext_suspended flag is cleared by java_resume() | |
| 2176 while (is_ext_suspended()) { | |
| 2177 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2178 } | |
| 2179 } | |
| 2180 | |
| 2181 return ret; | |
| 2182 } | |
| 2183 | |
| 2184 #ifdef ASSERT | |
| 2185 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2186 // hence doesn't need protection from concurrent access at this stage | |
| 2187 void JavaThread::verify_not_published() { | |
| 2188 if (!Threads_lock->owned_by_self()) { | |
| 2189 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2190 assert( !Threads::includes(this), | |
| 2191 "java thread shouldn't have been published yet!"); | |
| 2192 } | |
| 2193 else { | |
| 2194 assert( !Threads::includes(this), | |
| 2195 "java thread shouldn't have been published yet!"); | |
| 2196 } | |
| 2197 } | |
| 2198 #endif | |
| 2199 | |
| 2200 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2201 // progress or when _suspend_flags is non-zero. | |
| 2202 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2203 // block if a safepoint is in progress. | |
| 2204 // Async exception ISN'T checked. | |
| 2205 // Note only the ThreadInVMfromNative transition can call this function | |
| 2206 // directly and when thread state is _thread_in_native_trans | |
| 2207 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2208 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2209 | |
| 2210 JavaThread *curJT = JavaThread::current(); | |
| 2211 bool do_self_suspend = thread->is_external_suspend(); | |
| 2212 | |
| 2213 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2214 | |
| 2215 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2216 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2217 // threads could call into the VM with another thread's JNIEnv so we | |
| 2218 // can be here operating on behalf of a suspended thread (4432884). | |
| 2219 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2220 JavaThreadState state = thread->thread_state(); | |
| 2221 | |
| 2222 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2223 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2224 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2225 thread->set_suspend_equivalent(); | |
| 2226 | |
| 2227 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2228 // wait until the thread changes to other thread state. There is no | |
| 2229 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2230 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2231 // too long. Temporarily change the state to _thread_blocked to | |
| 2232 // let the VM thread know that this thread is ready for GC. The problem | |
| 2233 // of changing thread state is that safepoint could happen just after | |
| 2234 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2235 // see the _thread_blocked state. We must check for safepoint | |
| 2236 // after restoring the state and make sure we won't leave while a safepoint | |
| 2237 // is in progress. | |
| 2238 thread->set_thread_state(_thread_blocked); | |
| 2239 thread->java_suspend_self(); | |
| 2240 thread->set_thread_state(state); | |
| 2241 // Make sure new state is seen by VM thread | |
| 2242 if (os::is_MP()) { | |
| 2243 if (UseMembar) { | |
| 2244 // Force a fence between the write above and read below | |
| 2245 OrderAccess::fence(); | |
| 2246 } else { | |
| 2247 // Must use this rather than serialization page in particular on Windows | |
| 2248 InterfaceSupport::serialize_memory(thread); | |
| 2249 } | |
| 2250 } | |
| 2251 } | |
| 2252 | |
| 2253 if (SafepointSynchronize::do_call_back()) { | |
| 2254 // If we are safepointing, then block the caller which may not be | |
| 2255 // the same as the target thread (see above). | |
| 2256 SafepointSynchronize::block(curJT); | |
| 2257 } | |
| 2258 | |
| 2259 if (thread->is_deopt_suspend()) { | |
| 2260 thread->clear_deopt_suspend(); | |
| 2261 RegisterMap map(thread, false); | |
| 2262 frame f = thread->last_frame(); | |
| 2263 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2264 f = f.sender(&map); | |
| 2265 } | |
| 2266 if (f.id() == thread->must_deopt_id()) { | |
| 2267 thread->clear_must_deopt_id(); | |
|
1727
da877bdc9000
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|
2268 f.deoptimize(thread); |
| 0 | 2269 } else { |
| 2270 fatal("missed deoptimization!"); | |
| 2271 } | |
| 2272 } | |
| 2273 } | |
| 2274 | |
| 2275 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2276 // progress or when _suspend_flags is non-zero. | |
| 2277 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2278 // block if a safepoint is in progress. | |
| 2279 // Also check for pending async exception (not including unsafe access error). | |
| 2280 // Note only the native==>VM/Java barriers can call this function and when | |
| 2281 // thread state is _thread_in_native_trans. | |
| 2282 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2283 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2284 | |
| 2285 if (thread->has_async_exception()) { | |
| 2286 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2287 // access error since that may block. | |
| 2288 thread->check_and_handle_async_exceptions(false); | |
| 2289 } | |
| 2290 } | |
| 2291 | |
|
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|
2292 // This is a variant of the normal |
|
0382d2b469b2
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diff
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|
2293 // check_special_condition_for_native_trans with slightly different |
|
0382d2b469b2
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diff
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|
2294 // semantics for use by critical native wrappers. It does all the |
|
0382d2b469b2
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|
2295 // normal checks but also performs the transition back into |
|
0382d2b469b2
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|
2296 // thread_in_Java state. This is required so that critical natives |
|
0382d2b469b2
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|
2297 // can potentially block and perform a GC if they are the last thread |
|
0382d2b469b2
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|
2298 // exiting the GC_locker. |
|
0382d2b469b2
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|
2299 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
|
0382d2b469b2
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diff
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|
2300 check_special_condition_for_native_trans(thread); |
|
0382d2b469b2
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|
2301 |
|
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|
2302 // Finish the transition |
|
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7013347: allow crypto functions to be called inline to enhance performance
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|
2303 thread->set_thread_state(_thread_in_Java); |
|
0382d2b469b2
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|
2304 |
|
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|
2305 if (thread->do_critical_native_unlock()) { |
|
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|
2306 ThreadInVMfromJavaNoAsyncException tiv(thread); |
|
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|
2307 GC_locker::unlock_critical(thread); |
|
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diff
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|
2308 thread->clear_critical_native_unlock(); |
|
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diff
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|
2309 } |
|
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|
2310 } |
|
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|
2311 |
| 0 | 2312 // We need to guarantee the Threads_lock here, since resumes are not |
| 2313 // allowed during safepoint synchronization | |
| 2314 // Can only resume from an external suspension | |
| 2315 void JavaThread::java_resume() { | |
| 2316 assert_locked_or_safepoint(Threads_lock); | |
| 2317 | |
| 2318 // Sanity check: thread is gone, has started exiting or the thread | |
| 2319 // was not externally suspended. | |
| 2320 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2321 return; | |
| 2322 } | |
| 2323 | |
| 2324 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2325 | |
| 2326 clear_external_suspend(); | |
| 2327 | |
| 2328 if (is_ext_suspended()) { | |
| 2329 clear_ext_suspended(); | |
| 2330 SR_lock()->notify_all(); | |
| 2331 } | |
| 2332 } | |
| 2333 | |
| 2334 void JavaThread::create_stack_guard_pages() { | |
| 2335 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2336 address low_addr = stack_base() - stack_size(); | |
| 2337 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2338 | |
| 2339 int allocate = os::allocate_stack_guard_pages(); | |
| 2340 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2341 | |
|
1320
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coleenp
parents:
1290
diff
changeset
|
2342 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2343 warning("Attempt to allocate stack guard pages failed."); |
| 2344 return; | |
| 2345 } | |
| 2346 | |
| 2347 if (os::guard_memory((char *) low_addr, len)) { | |
| 2348 _stack_guard_state = stack_guard_enabled; | |
| 2349 } else { | |
| 2350 warning("Attempt to protect stack guard pages failed."); | |
| 2351 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2352 warning("Attempt to deallocate stack guard pages failed."); | |
| 2353 } | |
| 2354 } | |
| 2355 } | |
| 2356 | |
| 2357 void JavaThread::remove_stack_guard_pages() { | |
| 2358 if (_stack_guard_state == stack_guard_unused) return; | |
| 2359 address low_addr = stack_base() - stack_size(); | |
| 2360 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2361 | |
| 2362 if (os::allocate_stack_guard_pages()) { | |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2363 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2364 _stack_guard_state = stack_guard_unused; |
| 2365 } else { | |
| 2366 warning("Attempt to deallocate stack guard pages failed."); | |
| 2367 } | |
| 2368 } else { | |
| 2369 if (_stack_guard_state == stack_guard_unused) return; | |
| 2370 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2371 _stack_guard_state = stack_guard_unused; | |
| 2372 } else { | |
| 2373 warning("Attempt to unprotect stack guard pages failed."); | |
| 2374 } | |
| 2375 } | |
| 2376 } | |
| 2377 | |
| 2378 void JavaThread::enable_stack_yellow_zone() { | |
| 2379 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2380 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2381 | |
| 2382 // The base notation is from the stacks point of view, growing downward. | |
| 2383 // We need to adjust it to work correctly with guard_memory() | |
| 2384 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2385 | |
| 2386 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2387 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2388 | |
| 2389 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2390 _stack_guard_state = stack_guard_enabled; | |
| 2391 } else { | |
| 2392 warning("Attempt to guard stack yellow zone failed."); | |
| 2393 } | |
| 2394 enable_register_stack_guard(); | |
| 2395 } | |
| 2396 | |
| 2397 void JavaThread::disable_stack_yellow_zone() { | |
| 2398 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2399 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2400 | |
| 2401 // Simply return if called for a thread that does not use guard pages. | |
| 2402 if (_stack_guard_state == stack_guard_unused) return; | |
| 2403 | |
| 2404 // The base notation is from the stacks point of view, growing downward. | |
| 2405 // We need to adjust it to work correctly with guard_memory() | |
| 2406 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2407 | |
| 2408 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2409 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2410 } else { | |
| 2411 warning("Attempt to unguard stack yellow zone failed."); | |
| 2412 } | |
| 2413 disable_register_stack_guard(); | |
| 2414 } | |
| 2415 | |
| 2416 void JavaThread::enable_stack_red_zone() { | |
| 2417 // The base notation is from the stacks point of view, growing downward. | |
| 2418 // We need to adjust it to work correctly with guard_memory() | |
| 2419 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2420 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2421 | |
| 2422 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2423 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2424 | |
| 2425 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2426 warning("Attempt to guard stack red zone failed."); | |
| 2427 } | |
| 2428 } | |
| 2429 | |
| 2430 void JavaThread::disable_stack_red_zone() { | |
| 2431 // The base notation is from the stacks point of view, growing downward. | |
| 2432 // We need to adjust it to work correctly with guard_memory() | |
| 2433 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2434 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2435 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2436 warning("Attempt to unguard stack red zone failed."); | |
| 2437 } | |
| 2438 } | |
| 2439 | |
| 2440 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2441 // ignore is there is no stack | |
| 2442 if (!has_last_Java_frame()) return; | |
| 2443 // traverse the stack frames. Starts from top frame. | |
| 2444 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2445 frame* fr = fst.current(); | |
| 2446 f(fr, fst.register_map()); | |
| 2447 } | |
| 2448 } | |
| 2449 | |
| 2450 | |
| 2451 #ifndef PRODUCT | |
| 2452 // Deoptimization | |
| 2453 // Function for testing deoptimization | |
| 2454 void JavaThread::deoptimize() { | |
| 2455 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2456 StackFrameStream fst(this, UseBiasedLocking); | |
| 2457 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2458 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2459 // Iterate over all frames in the thread and deoptimize | |
| 2460 for(; !fst.is_done(); fst.next()) { | |
| 2461 if(fst.current()->can_be_deoptimized()) { | |
| 2462 | |
| 2463 if (only_at) { | |
| 2464 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2465 // consists of comma or carriage return separated numbers so | |
| 2466 // search for the current bci in that string. | |
| 2467 address pc = fst.current()->pc(); | |
| 2468 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2469 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2470 char buffer[8]; | |
| 2471 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2472 size_t len = strlen(buffer); | |
| 2473 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2474 while (found != NULL) { | |
| 2475 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2476 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2477 // Check that the bci found is bracketed by terminators. | |
| 2478 break; | |
| 2479 } | |
| 2480 found = strstr(found + 1, buffer); | |
| 2481 } | |
| 2482 if (!found) { | |
| 2483 continue; | |
| 2484 } | |
| 2485 } | |
| 2486 | |
| 2487 if (DebugDeoptimization && !deopt) { | |
| 2488 deopt = true; // One-time only print before deopt | |
| 2489 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2490 trace_frames(); | |
| 2491 trace_stack(); | |
| 2492 } | |
| 2493 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2494 } | |
| 2495 } | |
| 2496 | |
| 2497 if (DebugDeoptimization && deopt) { | |
| 2498 tty->print_cr("[AFTER Deoptimization]"); | |
| 2499 trace_frames(); | |
| 2500 } | |
| 2501 } | |
| 2502 | |
| 2503 | |
| 2504 // Make zombies | |
| 2505 void JavaThread::make_zombies() { | |
| 2506 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2507 if (fst.current()->can_be_deoptimized()) { | |
| 2508 // it is a Java nmethod | |
| 2509 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2510 nm->make_not_entrant(); | |
| 2511 } | |
| 2512 } | |
| 2513 } | |
| 2514 #endif // PRODUCT | |
| 2515 | |
| 2516 | |
| 2517 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2518 if (!has_last_Java_frame()) return; | |
| 2519 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2520 StackFrameStream fst(this, UseBiasedLocking); | |
| 2521 for(; !fst.is_done(); fst.next()) { | |
| 2522 if (fst.current()->should_be_deoptimized()) { | |
|
5110
0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5056
diff
changeset
|
2523 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
| 0 | 2524 } |
| 2525 } | |
| 2526 } | |
| 2527 | |
| 2528 | |
| 2529 // GC support | |
| 2530 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2531 | |
| 2532 void JavaThread::gc_epilogue() { | |
| 2533 frames_do(frame_gc_epilogue); | |
| 2534 } | |
| 2535 | |
| 2536 | |
| 2537 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2538 | |
| 2539 void JavaThread::gc_prologue() { | |
| 2540 frames_do(frame_gc_prologue); | |
| 2541 } | |
| 2542 | |
|
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2543 // If the caller is a NamedThread, then remember, in the current scope, |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2544 // the given JavaThread in its _processed_thread field. |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2545 class RememberProcessedThread: public StackObj { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2546 NamedThread* _cur_thr; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2547 public: |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2548 RememberProcessedThread(JavaThread* jthr) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2549 Thread* thread = Thread::current(); |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2550 if (thread->is_Named_thread()) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2551 _cur_thr = (NamedThread *)thread; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2552 _cur_thr->set_processed_thread(jthr); |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2553 } else { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2554 _cur_thr = NULL; |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2555 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2556 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2557 |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2558 ~RememberProcessedThread() { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2559 if (_cur_thr) { |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2560 _cur_thr->set_processed_thread(NULL); |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2561 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2562 } |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2563 }; |
| 0 | 2564 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2565 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2566 // Verify that the deferred card marks have been flushed. |
| 2567 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
997
diff
changeset
|
2568 |
| 0 | 2569 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2570 // since there may be more than one thread using each ThreadProfiler. | |
| 2571 | |
| 2572 // Traverse the GCHandles | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2573 Thread::oops_do(f, cf); |
| 0 | 2574 |
| 2575 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2576 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2577 | |
| 2578 if (has_last_Java_frame()) { | |
|
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2579 // Record JavaThread to GC thread |
|
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2580 RememberProcessedThread rpt(this); |
| 0 | 2581 |
| 2582 // Traverse the privileged stack | |
| 2583 if (_privileged_stack_top != NULL) { | |
| 2584 _privileged_stack_top->oops_do(f); | |
| 2585 } | |
| 2586 | |
| 2587 // traverse the registered growable array | |
| 2588 if (_array_for_gc != NULL) { | |
| 2589 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2590 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2591 } | |
| 2592 } | |
| 2593 | |
| 2594 // Traverse the monitor chunks | |
| 2595 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2596 chunk->oops_do(f); | |
| 2597 } | |
| 2598 | |
| 2599 // Traverse the execution stack | |
| 2600 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2601 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2602 } |
| 2603 } | |
| 2604 | |
| 2605 // callee_target is never live across a gc point so NULL it here should | |
| 2606 // it still contain a methdOop. | |
| 2607 | |
| 2608 set_callee_target(NULL); | |
| 2609 | |
| 2610 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2611 // If we have deferred set_locals there might be oops waiting to be | |
| 2612 // written | |
| 2613 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2614 if (list != NULL) { | |
| 2615 for (int i = 0; i < list->length(); i++) { | |
| 2616 list->at(i)->oops_do(f); | |
| 2617 } | |
| 2618 } | |
| 2619 | |
| 2620 // Traverse instance variables at the end since the GC may be moving things | |
| 2621 // around using this function | |
| 2622 f->do_oop((oop*) &_threadObj); | |
| 2623 f->do_oop((oop*) &_vm_result); | |
| 2624 f->do_oop((oop*) &_vm_result_2); | |
|
3558
bc95d122df79
added runtime call to supply info upon deoptimization
Lukas Stadler <lukas.stadler@jku.at>
parents:
3555
diff
changeset
|
2625 f->do_oop((oop*) &_graal_deopt_info); |
| 0 | 2626 f->do_oop((oop*) &_exception_oop); |
| 2627 f->do_oop((oop*) &_pending_async_exception); | |
| 2628 | |
| 2629 if (jvmti_thread_state() != NULL) { | |
| 2630 jvmti_thread_state()->oops_do(f); | |
| 2631 } | |
|
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2632 |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2633 if (_scanned_nmethod != NULL && cf != NULL) { |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2634 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2635 // process it here to make sure it isn't unloaded in the middle of |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2636 // a scan. |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2637 cf->do_code_blob(_scanned_nmethod); |
|
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2638 } |
| 0 | 2639 } |
| 2640 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2641 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2642 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2643 |
| 2644 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2645 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2646 | |
| 2647 if (has_last_Java_frame()) { | |
| 2648 // Traverse the execution stack | |
| 2649 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2650 fst.current()->nmethods_do(cf); |
| 0 | 2651 } |
| 2652 } | |
| 2653 } | |
| 2654 | |
| 2655 // Printing | |
| 2656 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2657 switch (_thread_state) { | |
| 2658 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2659 case _thread_new: return "_thread_new"; | |
| 2660 case _thread_new_trans: return "_thread_new_trans"; | |
| 2661 case _thread_in_native: return "_thread_in_native"; | |
| 2662 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2663 case _thread_in_vm: return "_thread_in_vm"; | |
| 2664 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2665 case _thread_in_Java: return "_thread_in_Java"; | |
| 2666 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2667 case _thread_blocked: return "_thread_blocked"; | |
| 2668 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2669 default: return "unknown thread state"; | |
| 2670 } | |
| 2671 } | |
| 2672 | |
| 2673 #ifndef PRODUCT | |
| 2674 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2675 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2676 }; | |
| 2677 void JavaThread::print_thread_state() const { | |
| 2678 print_thread_state_on(tty); | |
| 2679 }; | |
| 2680 #endif // PRODUCT | |
| 2681 | |
| 2682 // Called by Threads::print() for VM_PrintThreads operation | |
| 2683 void JavaThread::print_on(outputStream *st) const { | |
| 2684 st->print("\"%s\" ", get_thread_name()); | |
| 2685 oop thread_oop = threadObj(); | |
| 2686 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2687 Thread::print_on(st); | |
| 2688 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
2689 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2690 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2691 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2692 } | |
| 2693 #ifndef PRODUCT | |
| 2694 print_thread_state_on(st); | |
| 2695 _safepoint_state->print_on(st); | |
| 2696 #endif // PRODUCT | |
| 2697 } | |
| 2698 | |
| 2699 // Called by fatal error handler. The difference between this and | |
| 2700 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2701 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2702 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2703 oop thread_obj = threadObj(); | |
| 2704 if (thread_obj != NULL) { | |
| 2705 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2706 } | |
| 2707 st->print(" ["); | |
| 2708 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2709 if (osthread()) { | |
| 2710 st->print(", id=%d", osthread()->thread_id()); | |
| 2711 } | |
| 2712 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2713 _stack_base - _stack_size, _stack_base); | |
| 2714 st->print("]"); | |
| 2715 return; | |
| 2716 } | |
| 2717 | |
| 2718 // Verification | |
| 2719 | |
| 2720 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2721 | |
| 2722 void JavaThread::verify() { | |
| 2723 // Verify oops in the thread. | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2724 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2725 |
| 2726 // Verify the stack frames. | |
| 2727 frames_do(frame_verify); | |
| 2728 } | |
| 2729 | |
| 2730 // CR 6300358 (sub-CR 2137150) | |
| 2731 // Most callers of this method assume that it can't return NULL but a | |
| 2732 // thread may not have a name whilst it is in the process of attaching to | |
| 2733 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2734 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2735 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2736 // for such that this method never returns NULL. | |
| 2737 const char* JavaThread::get_thread_name() const { | |
| 2738 #ifdef ASSERT | |
| 2739 // early safepoints can hit while current thread does not yet have TLS | |
| 2740 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2741 Thread *cur = Thread::current(); | |
| 2742 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2743 // Current JavaThreads are allowed to get their own name without | |
| 2744 // the Threads_lock. | |
| 2745 assert_locked_or_safepoint(Threads_lock); | |
| 2746 } | |
| 2747 } | |
| 2748 #endif // ASSERT | |
| 2749 return get_thread_name_string(); | |
| 2750 } | |
| 2751 | |
| 2752 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2753 // descriptive string if there is no set name | |
| 2754 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2755 const char* name_str; | |
| 2756 oop thread_obj = threadObj(); | |
| 2757 if (thread_obj != NULL) { | |
| 2758 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2759 if (name != NULL) { | |
| 2760 if (buf == NULL) { | |
| 2761 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2762 } | |
| 2763 else { | |
| 2764 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2765 } | |
| 2766 } | |
| 4006 | 2767 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2768 name_str = "<no-name - thread is attaching>"; |
| 2769 } | |
| 2770 else { | |
| 2771 name_str = Thread::name(); | |
| 2772 } | |
| 2773 } | |
| 2774 else { | |
| 2775 name_str = Thread::name(); | |
| 2776 } | |
| 2777 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2778 return name_str; | |
| 2779 } | |
| 2780 | |
| 2781 | |
| 2782 const char* JavaThread::get_threadgroup_name() const { | |
| 2783 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2784 oop thread_obj = threadObj(); | |
| 2785 if (thread_obj != NULL) { | |
| 2786 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2787 if (thread_group != NULL) { | |
| 2788 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2789 // ThreadGroup.name can be null | |
| 2790 if (name != NULL) { | |
| 2791 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2792 return str; | |
| 2793 } | |
| 2794 } | |
| 2795 } | |
| 2796 return NULL; | |
| 2797 } | |
| 2798 | |
| 2799 const char* JavaThread::get_parent_name() const { | |
| 2800 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2801 oop thread_obj = threadObj(); | |
| 2802 if (thread_obj != NULL) { | |
| 2803 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2804 if (thread_group != NULL) { | |
| 2805 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2806 if (parent != NULL) { | |
| 2807 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2808 // ThreadGroup.name can be null | |
| 2809 if (name != NULL) { | |
| 2810 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2811 return str; | |
| 2812 } | |
| 2813 } | |
| 2814 } | |
| 2815 } | |
| 2816 return NULL; | |
| 2817 } | |
| 2818 | |
| 2819 ThreadPriority JavaThread::java_priority() const { | |
| 2820 oop thr_oop = threadObj(); | |
| 2821 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2822 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2823 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2824 return priority; | |
| 2825 } | |
| 2826 | |
| 2827 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2828 | |
| 2829 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2830 // Link Java Thread object <-> C++ Thread | |
| 2831 | |
| 2832 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2833 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2834 // be used to pass the C++ thread object to other methods. | |
| 2835 | |
| 2836 // Set the Java level thread object (jthread) field of the | |
| 2837 // new thread (a JavaThread *) to C++ thread object using the | |
| 2838 // "thread_oop" handle. | |
| 2839 | |
| 2840 // Set the thread field (a JavaThread *) of the | |
| 2841 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2842 | |
| 2843 Handle thread_oop(Thread::current(), | |
| 2844 JNIHandles::resolve_non_null(jni_thread)); | |
| 2845 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2846 "must be initialized"); | |
| 2847 set_threadObj(thread_oop()); | |
| 2848 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2849 | |
| 2850 if (prio == NoPriority) { | |
| 2851 prio = java_lang_Thread::priority(thread_oop()); | |
| 2852 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2853 } | |
| 2854 | |
| 2855 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2856 Thread::set_priority(this, prio); | |
| 2857 | |
| 2858 // Add the new thread to the Threads list and set it in motion. | |
| 2859 // We must have threads lock in order to call Threads::add. | |
| 2860 // It is crucial that we do not block before the thread is | |
| 2861 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2862 // will not be visited by GC. | |
| 2863 Threads::add(this); | |
| 2864 } | |
| 2865 | |
| 2866 oop JavaThread::current_park_blocker() { | |
| 2867 // Support for JSR-166 locks | |
| 2868 oop thread_oop = threadObj(); | |
| 242 | 2869 if (thread_oop != NULL && |
| 2870 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2871 return java_lang_Thread::park_blocker(thread_oop); |
| 2872 } | |
| 2873 return NULL; | |
| 2874 } | |
| 2875 | |
| 2876 | |
| 2877 void JavaThread::print_stack_on(outputStream* st) { | |
| 2878 if (!has_last_Java_frame()) return; | |
| 2879 ResourceMark rm; | |
| 2880 HandleMark hm; | |
| 2881 | |
| 2882 RegisterMap reg_map(this); | |
| 2883 vframe* start_vf = last_java_vframe(®_map); | |
| 2884 int count = 0; | |
| 2885 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2886 if (f->is_java_frame()) { | |
| 2887 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2888 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2889 | |
| 2890 // Print out lock information | |
| 2891 if (JavaMonitorsInStackTrace) { | |
| 2892 jvf->print_lock_info_on(st, count); | |
| 2893 } | |
| 2894 } else { | |
| 2895 // Ignore non-Java frames | |
| 2896 } | |
| 2897 | |
| 2898 // Bail-out case for too deep stacks | |
| 2899 count++; | |
| 2900 if (MaxJavaStackTraceDepth == count) return; | |
| 2901 } | |
| 2902 } | |
| 2903 | |
| 2904 | |
| 2905 // JVMTI PopFrame support | |
| 2906 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2907 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2908 if (in_bytes(size_in_bytes) != 0) { | |
| 2909 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2910 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
|
1603
d93949c5bdcc
6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
kvn
parents:
1584
diff
changeset
|
2911 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2912 } |
| 2913 } | |
| 2914 | |
| 2915 void* JavaThread::popframe_preserved_args() { | |
| 2916 return _popframe_preserved_args; | |
| 2917 } | |
| 2918 | |
| 2919 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2920 return in_ByteSize(_popframe_preserved_args_size); | |
| 2921 } | |
| 2922 | |
| 2923 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2924 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2925 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2926 return in_WordSize(sz / wordSize); | |
| 2927 } | |
| 2928 | |
| 2929 void JavaThread::popframe_free_preserved_args() { | |
| 2930 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2931 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2932 _popframe_preserved_args = NULL; | |
| 2933 _popframe_preserved_args_size = 0; | |
| 2934 } | |
| 2935 | |
| 2936 #ifndef PRODUCT | |
| 2937 | |
| 2938 void JavaThread::trace_frames() { | |
| 2939 tty->print_cr("[Describe stack]"); | |
| 2940 int frame_no = 1; | |
| 2941 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2942 tty->print(" %d. ", frame_no++); | |
| 2943 fst.current()->print_value_on(tty,this); | |
| 2944 tty->cr(); | |
| 2945 } | |
| 2946 } | |
| 2947 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2948 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2949 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2950 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2951 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2952 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2953 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2954 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2955 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2956 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2957 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2958 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2959 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2960 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2961 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2962 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2963 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2964 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2965 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2966 virtual void do_oop(oop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2967 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2968 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
2969 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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diff
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|
2970 |
|
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|
2971 static void oops_print(frame* f, const RegisterMap *map) { |
|
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|
2972 PrintAndVerifyOopClosure print; |
|
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|
2973 f->print_value(); |
|
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|
2974 f->oops_do(&print, NULL, (RegisterMap*)map); |
|
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|
2975 } |
|
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|
2976 |
|
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changeset
|
2977 // Print our all the locations that contain oops and whether they are |
|
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|
2978 // valid or not. This useful when trying to find the oldest frame |
|
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|
2979 // where an oop has gone bad since the frame walk is from youngest to |
|
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|
2980 // oldest. |
|
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|
2981 void JavaThread::trace_oops() { |
|
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|
2982 tty->print_cr("[Trace oops]"); |
|
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|
2983 frames_do(oops_print); |
|
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|
2984 } |
|
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|
2985 |
| 0 | 2986 |
|
3388
a80577f854f9
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|
2987 #ifdef ASSERT |
|
3336
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|
2988 // Print or validate the layout of stack frames |
|
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|
2989 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
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|
2990 ResourceMark rm; |
|
2e038ad0c1d0
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|
2991 PRESERVE_EXCEPTION_MARK; |
|
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|
2992 FrameValues values; |
|
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|
2993 int frame_no = 0; |
|
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|
2994 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
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|
2995 fst.current()->describe(values, ++frame_no); |
|
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|
2996 if (depth == frame_no) break; |
|
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|
2997 } |
|
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|
2998 if (validate_only) { |
|
2e038ad0c1d0
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|
2999 values.validate(); |
|
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|
3000 } else { |
|
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|
3001 tty->print_cr("[Describe stack layout]"); |
|
4042
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twisti
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changeset
|
3002 values.print(this); |
|
3336
2e038ad0c1d0
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diff
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|
3003 } |
|
2e038ad0c1d0
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never
parents:
2416
diff
changeset
|
3004 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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parents:
3384
diff
changeset
|
3005 #endif |
|
3336
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|
3006 |
| 0 | 3007 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3008 ResourceMark rm; | |
| 3009 int vframe_no = 1; | |
| 3010 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3011 if (f->is_java_frame()) { | |
| 3012 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3013 } else { | |
| 3014 f->print(); | |
| 3015 } | |
| 3016 if (vframe_no > StackPrintLimit) { | |
| 3017 tty->print_cr("...<more frames>..."); | |
| 3018 return; | |
| 3019 } | |
| 3020 } | |
| 3021 } | |
| 3022 | |
| 3023 | |
| 3024 void JavaThread::trace_stack() { | |
| 3025 if (!has_last_Java_frame()) return; | |
| 3026 ResourceMark rm; | |
| 3027 HandleMark hm; | |
| 3028 RegisterMap reg_map(this); | |
| 3029 trace_stack_from(last_java_vframe(®_map)); | |
| 3030 } | |
| 3031 | |
| 3032 | |
| 3033 #endif // PRODUCT | |
| 3034 | |
| 3035 | |
| 3036 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3037 assert(reg_map != NULL, "a map must be given"); | |
| 3038 frame f = last_frame(); | |
| 3039 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3040 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3041 } | |
| 3042 return NULL; | |
| 3043 } | |
| 3044 | |
| 3045 | |
| 3046 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 3047 vframeStream vfst(this); | |
| 3048 vfst.security_get_caller_frame(depth); | |
| 3049 if (!vfst.at_end()) { | |
| 3050 return vfst.method()->method_holder(); | |
| 3051 } | |
| 3052 return NULL; | |
| 3053 } | |
| 3054 | |
| 3055 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3056 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3057 CompileBroker::compiler_thread_loop(); | |
| 3058 } | |
| 3059 | |
| 3060 // Create a CompilerThread | |
| 3061 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3062 : JavaThread(&compiler_thread_entry) { | |
| 3063 _log = NULL; | |
| 3064 _task = NULL; | |
| 3065 _queue = queue; | |
| 3066 _counters = counters; | |
| 3067 | |
| 3068 #ifndef PRODUCT | |
| 3069 _ideal_graph_printer = NULL; | |
| 3070 #endif | |
| 3071 } | |
| 3072 | |
| 3073 // ======= Threads ======== | |
| 3074 | |
| 3075 // The Threads class links together all active threads, and provides | |
| 3076 // operations over all threads. It is protected by its own Mutex | |
| 3077 // lock, which is also used in other contexts to protect thread | |
| 3078 // operations from having the thread being operated on from exiting | |
| 3079 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3080 | |
| 3081 JavaThread* Threads::_thread_list = NULL; | |
| 3082 int Threads::_number_of_threads = 0; | |
| 3083 int Threads::_number_of_non_daemon_threads = 0; | |
| 3084 int Threads::_return_code = 0; | |
| 3085 size_t JavaThread::_stack_size_at_create = 0; | |
| 3086 | |
| 3087 // All JavaThreads | |
| 3088 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3089 | |
| 3090 void os_stream(); | |
| 3091 | |
| 3092 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3093 void Threads::threads_do(ThreadClosure* tc) { | |
| 3094 assert_locked_or_safepoint(Threads_lock); | |
| 3095 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3096 ALL_JAVA_THREADS(p) { | |
| 3097 tc->do_thread(p); | |
| 3098 } | |
| 3099 // Someday we could have a table or list of all non-JavaThreads. | |
| 3100 // For now, just manually iterate through them. | |
| 3101 tc->do_thread(VMThread::vm_thread()); | |
| 3102 Universe::heap()->gc_threads_do(tc); | |
|
323
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|
3103 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
3104 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
b33eef719520
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|
3105 // the data for WatcherThread is still valid upon being examined. However, |
|
b33eef719520
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xlu
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286
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changeset
|
3106 // considering that WatchThread terminates when the VM is on the way to |
|
b33eef719520
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changeset
|
3107 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3108 // way to prevent termination of WatcherThread would be to acquire |
|
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286
diff
changeset
|
3109 // Terminator_lock, but we can't do that without violating the lock rank |
|
b33eef719520
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changeset
|
3110 // checking in some cases. |
|
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diff
changeset
|
3111 if (wt != NULL) |
|
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diff
changeset
|
3112 tc->do_thread(wt); |
|
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|
3113 |
| 0 | 3114 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3115 } | |
| 3116 | |
| 3117 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3118 | |
| 242 | 3119 extern void JDK_Version_init(); |
| 3120 | |
| 0 | 3121 // Check version |
| 3122 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3123 | |
| 3124 // Initialize the output stream module | |
| 3125 ostream_init(); | |
| 3126 | |
| 3127 // Process java launcher properties. | |
| 3128 Arguments::process_sun_java_launcher_properties(args); | |
| 3129 | |
| 3130 // Initialize the os module before using TLS | |
| 3131 os::init(); | |
| 3132 | |
| 3133 // Initialize system properties. | |
| 3134 Arguments::init_system_properties(); | |
| 3135 | |
| 242 | 3136 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3137 JDK_Version_init(); | |
| 3138 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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parents:
1731
diff
changeset
|
3139 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3140 Arguments::init_version_specific_system_properties(); |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3141 |
| 0 | 3142 // Parse arguments |
| 3143 jint parse_result = Arguments::parse(args); | |
| 3144 if (parse_result != JNI_OK) return parse_result; | |
| 3145 | |
| 3146 if (PauseAtStartup) { | |
| 3147 os::pause(); | |
| 3148 } | |
| 3149 | |
| 4006 | 3150 #ifndef USDT2 |
| 0 | 3151 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3152 #else /* USDT2 */ |
| 3153 HOTSPOT_VM_INIT_BEGIN(); | |
| 3154 #endif /* USDT2 */ | |
| 0 | 3155 |
| 3156 // Record VM creation timing statistics | |
| 3157 TraceVmCreationTime create_vm_timer; | |
| 3158 create_vm_timer.start(); | |
| 3159 | |
| 3160 // Timing (must come after argument parsing) | |
| 3161 TraceTime timer("Create VM", TraceStartupTime); | |
| 3162 | |
| 3163 // Initialize the os module after parsing the args | |
| 3164 jint os_init_2_result = os::init_2(); | |
| 3165 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3166 | |
| 3167 // Initialize output stream logging | |
| 3168 ostream_init_log(); | |
| 3169 | |
| 3170 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3171 // Must be before create_vm_init_agents() | |
| 3172 if (Arguments::init_libraries_at_startup()) { | |
| 3173 convert_vm_init_libraries_to_agents(); | |
| 3174 } | |
| 3175 | |
| 3176 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3177 if (Arguments::init_agents_at_startup()) { | |
| 3178 create_vm_init_agents(); | |
| 3179 } | |
| 3180 | |
| 3181 // Initialize Threads state | |
| 3182 _thread_list = NULL; | |
| 3183 _number_of_threads = 0; | |
| 3184 _number_of_non_daemon_threads = 0; | |
| 3185 | |
| 3186 // Initialize TLS | |
| 3187 ThreadLocalStorage::init(); | |
| 3188 | |
| 3189 // Initialize global data structures and create system classes in heap | |
| 3190 vm_init_globals(); | |
| 3191 | |
| 3192 // Attach the main thread to this os thread | |
| 3193 JavaThread* main_thread = new JavaThread(); | |
| 3194 main_thread->set_thread_state(_thread_in_vm); | |
| 3195 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3196 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3197 // change the stack size recorded here to one based on the java thread | |
| 3198 // stacksize. This adjusted size is what is used to figure the placement | |
| 3199 // of the guard pages. | |
| 3200 main_thread->record_stack_base_and_size(); | |
| 3201 main_thread->initialize_thread_local_storage(); | |
| 3202 | |
| 3203 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3204 | |
| 3205 if (!main_thread->set_as_starting_thread()) { | |
| 3206 vm_shutdown_during_initialization( | |
| 3207 "Failed necessary internal allocation. Out of swap space"); | |
| 3208 delete main_thread; | |
| 3209 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3210 return JNI_ENOMEM; | |
| 3211 } | |
| 3212 | |
| 3213 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3214 // crash Linux VM, see notes in os_linux.cpp. | |
| 3215 main_thread->create_stack_guard_pages(); | |
| 3216 | |
| 1878 | 3217 // Initialize Java-Level synchronization subsystem |
| 3218 ObjectMonitor::Initialize() ; | |
| 0 | 3219 |
| 3220 // Initialize global modules | |
| 3221 jint status = init_globals(); | |
| 3222 if (status != JNI_OK) { | |
| 3223 delete main_thread; | |
| 3224 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3225 return status; | |
| 3226 } | |
| 3227 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3228 // Should be done after the heap is fully created |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3229 main_thread->cache_global_variables(); |
|
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6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3230 |
| 0 | 3231 HandleMark hm; |
| 3232 | |
| 3233 { MutexLocker mu(Threads_lock); | |
| 3234 Threads::add(main_thread); | |
| 3235 } | |
| 3236 | |
| 3237 // Any JVMTI raw monitors entered in onload will transition into | |
| 3238 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3239 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3240 | |
| 3241 if (VerifyBeforeGC && | |
| 3242 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3243 Universe::heap()->prepare_for_verify(); | |
| 3244 Universe::verify(); // make sure we're starting with a clean slate | |
| 3245 } | |
| 3246 | |
| 3247 // Create the VMThread | |
| 3248 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3249 VMThread::create(); | |
| 3250 Thread* vmthread = VMThread::vm_thread(); | |
| 3251 | |
| 3252 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3253 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3254 | |
| 3255 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3256 // Monitors can have spurious returns, must always check another state flag | |
| 3257 { | |
| 3258 MutexLocker ml(Notify_lock); | |
| 3259 os::start_thread(vmthread); | |
| 3260 while (vmthread->active_handles() == NULL) { | |
| 3261 Notify_lock->wait(); | |
| 3262 } | |
| 3263 } | |
| 3264 } | |
| 3265 | |
| 3266 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3267 EXCEPTION_MARK; | |
| 3268 | |
| 3269 // At this point, the Universe is initialized, but we have not executed | |
| 3270 // any byte code. Now is a good time (the only time) to dump out the | |
| 3271 // internal state of the JVM for sharing. | |
| 3272 | |
| 3273 if (DumpSharedSpaces) { | |
| 3274 Universe::heap()->preload_and_dump(CHECK_0); | |
| 3275 ShouldNotReachHere(); | |
| 3276 } | |
| 3277 | |
| 3278 // Always call even when there are not JVMTI environments yet, since environments | |
| 3279 // may be attached late and JVMTI must track phases of VM execution | |
| 3280 JvmtiExport::enter_start_phase(); | |
| 3281 | |
| 3282 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3283 JvmtiExport::post_vm_start(); | |
| 3284 | |
| 3285 { | |
| 3286 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3287 | |
| 3288 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3289 create_vm_init_libraries(); | |
| 3290 } | |
| 3291 | |
| 3292 if (InitializeJavaLangString) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3293 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3294 } else { |
| 3295 warning("java.lang.String not initialized"); | |
| 3296 } | |
| 3297 | |
|
18
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0
diff
changeset
|
3298 if (AggressiveOpts) { |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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diff
changeset
|
3299 { |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3300 // Forcibly initialize java/util/HashMap and mutate the private |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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62
diff
changeset
|
3301 // static final "frontCacheEnabled" field before we start creating instances |
|
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3302 #ifdef ASSERT |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3303 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
6d13fcb3663f
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diff
changeset
|
3304 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
c7d713375c94
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phh
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0
diff
changeset
|
3305 #endif |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
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|
3306 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
6d13fcb3663f
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62
diff
changeset
|
3307 KlassHandle k = KlassHandle(THREAD, k_o); |
|
6d13fcb3663f
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62
diff
changeset
|
3308 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
6d13fcb3663f
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kvn
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62
diff
changeset
|
3309 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
6d13fcb3663f
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kvn
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62
diff
changeset
|
3310 ik->initialize(CHECK_0); |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3311 fieldDescriptor fd; |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3312 // Possible we might not find this field; if so, don't break |
|
6d13fcb3663f
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62
diff
changeset
|
3313 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
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diff
changeset
|
3314 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
6d13fcb3663f
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diff
changeset
|
3315 } |
|
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3316 } |
|
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3317 |
|
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3318 if (UseStringCache) { |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3319 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
6d13fcb3663f
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diff
changeset
|
3320 // static final "stringCacheEnabled" field before we start creating instances |
|
2177
3582bf76420e
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coleenp
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diff
changeset
|
3321 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
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parents:
441
diff
changeset
|
3322 // 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
|
3323 if (k_o != NULL) { |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3324 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3325 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3326 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3327 fieldDescriptor fd; |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3328 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
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phh
parents:
441
diff
changeset
|
3329 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
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never
parents:
2302
diff
changeset
|
3330 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
eca19a8425b5
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phh
parents:
441
diff
changeset
|
3331 } |
|
192
6d13fcb3663f
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parents:
62
diff
changeset
|
3332 } |
|
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3333 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3334 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3335 |
| 0 | 3336 // Initialize java_lang.System (needed before creating the thread) |
| 3337 if (InitializeJavaLangSystem) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3338 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3339 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3340 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3341 Universe::set_main_thread_group(thread_group()); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3342 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3343 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3344 main_thread->set_threadObj(thread_object); | |
| 3345 // Set thread status to running since main thread has | |
| 3346 // been started and running. | |
| 3347 java_lang_Thread::set_thread_status(thread_object, | |
| 3348 java_lang_Thread::RUNNABLE); | |
| 3349 | |
| 3350 // 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
|
3351 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
|
3352 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3353 // 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
|
3354 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3355 call_initializeSystemClass(CHECK_0); |
| 3356 } else { | |
| 3357 warning("java.lang.System not initialized"); | |
| 3358 } | |
| 3359 | |
| 3360 // an instance of OutOfMemory exception has been allocated earlier | |
| 3361 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3362 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3363 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3364 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3365 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3366 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3367 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3368 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3369 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
| 0 | 3370 } else { |
| 3371 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3372 warning("java.lang.NullPointerException has not been initialized"); | |
| 3373 warning("java.lang.ClassCastException has not been initialized"); | |
| 3374 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3375 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3376 warning("java.lang.StackOverflowError has not been initialized"); | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3377 warning("java.lang.IllegalArgumentException has not been initialized"); |
| 0 | 3378 } |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3379 } |
| 0 | 3380 |
| 3381 // See : bugid 4211085. | |
| 3382 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3383 // property"java.compiler" and read & write property "java.vm.info". | |
| 3384 // When a security manager is installed through the command line | |
| 3385 // option "-Djava.security.manager", the above properties are not | |
| 3386 // readable and the static initializer for java.lang.Compiler fails | |
| 3387 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3388 // user code which calls methods in java.lang.Compiler. | |
| 3389 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3390 // system domains are on the stack when the properties are read. | |
| 3391 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3392 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3393 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3394 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3395 // 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
|
3396 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3397 |
| 3398 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3399 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3400 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3401 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3402 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3403 reset_vm_info_property(CHECK_0); | |
| 3404 | |
| 3405 quicken_jni_functions(); | |
| 3406 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3407 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3408 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3409 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3410 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3411 |
| 0 | 3412 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3413 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3414 set_init_completed(); | |
| 3415 | |
| 4006 | 3416 #ifndef USDT2 |
| 0 | 3417 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3418 #else /* USDT2 */ |
| 3419 HOTSPOT_VM_INIT_END(); | |
| 3420 #endif /* USDT2 */ | |
| 0 | 3421 |
| 3422 // record VM initialization completion time | |
| 3423 Management::record_vm_init_completed(); | |
| 3424 | |
| 3425 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3426 // valid exceptions may be thrown in the process. | |
| 3427 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3428 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3429 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3430 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3431 if (HAS_PENDING_EXCEPTION) { | |
| 3432 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3433 } | |
| 3434 | |
| 3435 #ifndef SERIALGC | |
| 3436 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3437 // 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
|
3438 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3439 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3440 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3441 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3442 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3443 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3444 } |
| 0 | 3445 if (HAS_PENDING_EXCEPTION) { |
| 3446 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3447 } | |
| 3448 } | |
| 3449 #endif // SERIALGC | |
| 3450 | |
| 3451 // Always call even when there are not JVMTI environments yet, since environments | |
| 3452 // may be attached late and JVMTI must track phases of VM execution | |
| 3453 JvmtiExport::enter_live_phase(); | |
| 3454 | |
| 3455 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3456 os::signal_init(); | |
| 3457 | |
| 3458 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3459 if (!DisableAttachMechanism) { | |
| 3460 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3461 AttachListener::init(); | |
| 3462 } | |
| 3463 } | |
| 3464 | |
| 3465 // Launch -Xrun agents | |
| 3466 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3467 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3468 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3469 create_vm_init_libraries(); | |
| 3470 } | |
| 3471 | |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3472 if (!TRACE_START()) { |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3473 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3474 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3475 |
| 0 | 3476 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
| 3477 JvmtiExport::post_vm_initialized(); | |
| 3478 | |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3479 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3480 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3481 } |
| 0 | 3482 |
| 3483 // initialize compiler(s) | |
| 3484 CompileBroker::compilation_init(); | |
| 3485 | |
| 3486 Management::initialize(THREAD); | |
| 3487 if (HAS_PENDING_EXCEPTION) { | |
| 3488 // management agent fails to start possibly due to | |
| 3489 // configuration problem and is responsible for printing | |
| 3490 // stack trace if appropriate. Simply exit VM. | |
| 3491 vm_exit(1); | |
| 3492 } | |
| 3493 | |
| 3494 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3495 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3496 if (MemProfiling) MemProfiler::engage(); | |
| 3497 StatSampler::engage(); | |
| 3498 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3499 | |
| 3500 BiasedLocking::init(); | |
| 3501 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3502 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
|
3503 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3504 // 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
|
3505 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3506 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3507 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3508 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3509 } |
| 0 | 3510 |
| 3511 // Start up the WatcherThread if there are any periodic tasks | |
| 3512 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3513 // aren't, late joiners might appear to start slowly (we might | |
| 3514 // take a while to process their first tick). | |
| 3515 if (PeriodicTask::num_tasks() > 0) { | |
| 3516 WatcherThread::start(); | |
| 3517 } | |
| 3518 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3519 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3520 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3521 |
| 0 | 3522 create_vm_timer.end(); |
| 3523 return JNI_OK; | |
| 3524 } | |
| 3525 | |
| 3526 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3527 extern "C" { | |
| 3528 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3529 } | |
| 3530 // Find a command line agent library and return its entry point for | |
| 3531 // -agentlib: -agentpath: -Xrun | |
| 3532 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3533 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3534 OnLoadEntry_t on_load_entry = NULL; | |
| 3535 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3536 | |
| 3537 if (library == NULL) { | |
| 3538 char buffer[JVM_MAXPATHLEN]; | |
| 3539 char ebuf[1024]; | |
| 3540 const char *name = agent->name(); | |
|
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|
3541 const char *msg = "Could not find agent library "; |
| 0 | 3542 |
| 3543 if (agent->is_absolute_path()) { | |
|
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diff
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|
3544 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3545 if (library == NULL) { |
|
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diff
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|
3546 const char *sub_msg = " in absolute path, with error: "; |
|
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6378314: Bad warning message when agent library not found. local directory is not searched.
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diff
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|
3547 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
|
ab3fd720516c
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diff
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|
3548 char *buf = NEW_C_HEAP_ARRAY(char, len); |
|
ab3fd720516c
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|
3549 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3550 // If we can't find the agent, exit. |
|
1694
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diff
changeset
|
3551 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
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diff
changeset
|
3552 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3553 } |
| 3554 } else { | |
| 3555 // Try to load the agent from the standard dll directory | |
|
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diff
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|
3556 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
|
828eafbd85cc
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diff
changeset
|
3557 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3558 #ifdef KERNEL |
| 3559 // Download instrument dll | |
| 3560 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3561 char *props = Arguments::get_kernel_properties(); | |
| 3562 char *home = Arguments::get_java_home(); | |
| 3563 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3564 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
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diff
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|
3565 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.
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diff
changeset
|
3566 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
| 0 | 3567 jio_snprintf(cmd, length, fmt, home, props); |
| 3568 int status = os::fork_and_exec(cmd); | |
| 3569 FreeHeap(props); | |
| 3570 if (status == -1) { | |
| 3571 warning(cmd); | |
| 3572 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3573 strerror(errno)); | |
| 3574 } | |
|
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rasbold
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diff
changeset
|
3575 FREE_C_HEAP_ARRAY(char, cmd); |
| 0 | 3576 // when this comes back the instrument.dll should be where it belongs. |
|
1980
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diff
changeset
|
3577 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3578 } |
| 3579 #endif // KERNEL | |
| 3580 if (library == NULL) { // Try the local directory | |
| 3581 char ns[1] = {0}; | |
|
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diff
changeset
|
3582 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
3583 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3584 if (library == NULL) { |
|
1694
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rasbold
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diff
changeset
|
3585 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3586 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
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diff
changeset
|
3587 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
|
3588 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3589 // If we can't find the agent, exit. |
|
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rasbold
parents:
1681
diff
changeset
|
3590 vm_exit_during_initialization(buf, NULL); |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3591 FREE_C_HEAP_ARRAY(char, buf); |
| 0 | 3592 } |
| 3593 } | |
| 3594 } | |
| 3595 agent->set_os_lib(library); | |
| 3596 } | |
| 3597 | |
| 3598 // Find the OnLoad function. | |
| 3599 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
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1972
diff
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|
3600 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3601 if (on_load_entry != NULL) break; |
| 3602 } | |
| 3603 return on_load_entry; | |
| 3604 } | |
| 3605 | |
| 3606 // Find the JVM_OnLoad entry point | |
| 3607 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3608 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3609 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3610 } | |
| 3611 | |
| 3612 // Find the Agent_OnLoad entry point | |
| 3613 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3614 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3615 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3616 } | |
| 3617 | |
| 3618 // For backwards compatibility with -Xrun | |
| 3619 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3620 // treated like -agentpath: | |
| 3621 // Must be called before agent libraries are created | |
| 3622 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3623 AgentLibrary* agent; | |
| 3624 AgentLibrary* next; | |
| 3625 | |
| 3626 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3627 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3628 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3629 | |
| 3630 // If there is an JVM_OnLoad function it will get called later, | |
| 3631 // otherwise see if there is an Agent_OnLoad | |
| 3632 if (on_load_entry == NULL) { | |
| 3633 on_load_entry = lookup_agent_on_load(agent); | |
| 3634 if (on_load_entry != NULL) { | |
| 3635 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3636 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3637 Arguments::convert_library_to_agent(agent); | |
| 3638 } else { | |
| 3639 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3640 } | |
| 3641 } | |
| 3642 } | |
| 3643 } | |
| 3644 | |
| 3645 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3646 // Invokes Agent_OnLoad | |
| 3647 // Called very early -- before JavaThreads exist | |
| 3648 void Threads::create_vm_init_agents() { | |
| 3649 extern struct JavaVM_ main_vm; | |
| 3650 AgentLibrary* agent; | |
| 3651 | |
| 3652 JvmtiExport::enter_onload_phase(); | |
| 3653 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3654 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3655 | |
| 3656 if (on_load_entry != NULL) { | |
| 3657 // Invoke the Agent_OnLoad function | |
| 3658 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3659 if (err != JNI_OK) { | |
| 3660 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3661 } | |
| 3662 } else { | |
| 3663 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3664 } | |
| 3665 } | |
| 3666 JvmtiExport::enter_primordial_phase(); | |
| 3667 } | |
| 3668 | |
| 3669 extern "C" { | |
| 3670 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3671 } | |
| 3672 | |
| 3673 void Threads::shutdown_vm_agents() { | |
| 3674 // Send any Agent_OnUnload notifications | |
| 3675 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3676 extern struct JavaVM_ main_vm; | |
| 3677 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3678 | |
| 3679 // Find the Agent_OnUnload function. | |
| 3680 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3681 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
3682 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3683 |
| 3684 // Invoke the Agent_OnUnload function | |
| 3685 if (unload_entry != NULL) { | |
| 3686 JavaThread* thread = JavaThread::current(); | |
| 3687 ThreadToNativeFromVM ttn(thread); | |
| 3688 HandleMark hm(thread); | |
| 3689 (*unload_entry)(&main_vm); | |
| 3690 break; | |
| 3691 } | |
| 3692 } | |
| 3693 } | |
| 3694 } | |
| 3695 | |
| 3696 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3697 // Invokes JVM_OnLoad | |
| 3698 void Threads::create_vm_init_libraries() { | |
| 3699 extern struct JavaVM_ main_vm; | |
| 3700 AgentLibrary* agent; | |
| 3701 | |
| 3702 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3703 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3704 | |
| 3705 if (on_load_entry != NULL) { | |
| 3706 // Invoke the JVM_OnLoad function | |
| 3707 JavaThread* thread = JavaThread::current(); | |
| 3708 ThreadToNativeFromVM ttn(thread); | |
| 3709 HandleMark hm(thread); | |
| 3710 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3711 if (err != JNI_OK) { | |
| 3712 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3713 } | |
| 3714 } else { | |
| 3715 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3716 } | |
| 3717 } | |
| 3718 } | |
| 3719 | |
| 3720 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3721 void JavaThread::invoke_shutdown_hooks() { | |
| 3722 HandleMark hm(this); | |
| 3723 | |
| 3724 // We could get here with a pending exception, if so clear it now. | |
| 3725 if (this->has_pending_exception()) { | |
| 3726 this->clear_pending_exception(); | |
| 3727 } | |
| 3728 | |
| 3729 EXCEPTION_MARK; | |
| 3730 klassOop k = | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3731 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3732 THREAD); |
| 3733 if (k != NULL) { | |
| 3734 // SystemDictionary::resolve_or_null will return null if there was | |
| 3735 // an exception. If we cannot load the Shutdown class, just don't | |
| 3736 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3737 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3738 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3739 // was called, the Shutdown class would have already been loaded | |
| 3740 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3741 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3742 JavaValue result(T_VOID); | |
| 3743 JavaCalls::call_static(&result, | |
| 3744 shutdown_klass, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3745 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3746 vmSymbols::void_method_signature(), |
| 0 | 3747 THREAD); |
| 3748 } | |
| 3749 CLEAR_PENDING_EXCEPTION; | |
| 3750 } | |
| 3751 | |
| 3752 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3753 // the program falls off the end of main(). Another VM exit path is through | |
| 3754 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3755 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3756 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3757 // and VM_Exit op at VM level. | |
| 3758 // | |
| 3759 // Shutdown sequence: | |
| 3760 // + Wait until we are the last non-daemon thread to execute | |
| 3761 // <-- every thing is still working at this moment --> | |
| 3762 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3763 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3764 // + Call before_exit(), prepare for VM exit | |
| 3765 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3766 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3767 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3768 // post thread end and vm death events to JVMTI, | |
| 3769 // stop signal thread | |
| 3770 // + Call JavaThread::exit(), it will: | |
| 3771 // > release JNI handle blocks, remove stack guard pages | |
| 3772 // > remove this thread from Threads list | |
| 3773 // <-- no more Java code from this thread after this point --> | |
| 3774 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3775 // the compiler threads at safepoint | |
| 3776 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3777 // + Disable tracing at JNI/JVM barriers | |
| 3778 // + Set _vm_exited flag for threads that are still running native code | |
| 3779 // + Delete this thread | |
| 3780 // + Call exit_globals() | |
| 3781 // > deletes tty | |
| 3782 // > deletes PerfMemory resources | |
| 3783 // + Return to caller | |
| 3784 | |
| 3785 bool Threads::destroy_vm() { | |
| 3786 JavaThread* thread = JavaThread::current(); | |
| 3787 | |
| 3788 // Wait until we are the last non-daemon thread to execute | |
| 3789 { MutexLocker nu(Threads_lock); | |
| 3790 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3791 // This wait should make safepoint checks, wait without a timeout, | |
| 3792 // and wait as a suspend-equivalent condition. | |
| 3793 // | |
| 3794 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3795 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3796 // is waiting for the external suspend request on this thread to | |
| 3797 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3798 // timeout, but that takes time. Making this wait a suspend- | |
| 3799 // equivalent condition solves that timeout problem. | |
| 3800 // | |
| 3801 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3802 Mutex::_as_suspend_equivalent_flag); | |
| 3803 } | |
| 3804 | |
| 3805 // Hang forever on exit if we are reporting an error. | |
| 3806 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3807 os::infinite_sleep(); | |
| 3808 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2203
diff
changeset
|
3809 os::wait_for_keypress_at_exit(); |
| 0 | 3810 |
| 3811 if (JDK_Version::is_jdk12x_version()) { | |
| 3812 // We are the last thread running, so check if finalizers should be run. | |
| 3813 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3814 HandleMark rm(thread); | |
| 3815 Universe::run_finalizers_on_exit(); | |
| 3816 } else { | |
| 3817 // run Java level shutdown hooks | |
| 3818 thread->invoke_shutdown_hooks(); | |
| 3819 } | |
| 3820 | |
| 3821 before_exit(thread); | |
| 3822 | |
| 3823 thread->exit(true); | |
| 3824 | |
| 3825 // Stop VM thread. | |
| 3826 { | |
| 3827 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3828 // GC vm_operations can get caught at the safepoint, and the | |
| 3829 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3830 // to prevent this. The GC vm_operations will not be able to | |
| 3831 // queue until after the vm thread is dead. | |
|
3769
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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3388
diff
changeset
|
3832 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3833 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3834 // stopped; they remain inactive until the process exits. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3835 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3836 // but these will not be accessing the heap, just some G1-specific side |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3837 // data structures that are not accessed by any other threads but them |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3838 // after this point in a terminal safepoint. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3839 |
| 0 | 3840 MutexLocker ml(Heap_lock); |
| 3841 | |
| 3842 VMThread::wait_for_vm_thread_exit(); | |
| 3843 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3844 VMThread::destroy(); | |
| 3845 } | |
| 3846 | |
| 3847 // clean up ideal graph printers | |
| 3848 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3849 IdealGraphPrinter::clean_up(); | |
| 3850 #endif | |
| 3851 | |
| 3852 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3853 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3854 // daemon threads executing native code are still running. But they | |
| 3855 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3856 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3857 | |
| 3858 #ifndef PRODUCT | |
| 3859 // disable function tracing at JNI/JVM barriers | |
| 3860 TraceJNICalls = false; | |
| 3861 TraceJVMCalls = false; | |
| 3862 TraceRuntimeCalls = false; | |
| 3863 #endif | |
| 3864 | |
| 3865 VM_Exit::set_vm_exited(); | |
| 3866 | |
| 3867 notify_vm_shutdown(); | |
| 3868 | |
| 3869 delete thread; | |
| 3870 | |
| 3871 // exit_globals() will delete tty | |
| 3872 exit_globals(); | |
| 3873 | |
| 3874 return true; | |
| 3875 } | |
| 3876 | |
| 3877 | |
| 3878 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3879 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3880 return is_supported_jni_version(version); | |
| 3881 } | |
| 3882 | |
| 3883 | |
| 3884 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3885 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3886 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3887 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3888 return JNI_FALSE; | |
| 3889 } | |
| 3890 | |
| 3891 | |
| 3892 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3893 // The threads lock must be owned at this point | |
| 3894 assert_locked_or_safepoint(Threads_lock); | |
|
1842
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changeset
|
3895 |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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1838
diff
changeset
|
3896 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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1838
diff
changeset
|
3897 // 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
|
3898 p->initialize_queues(); |
| 0 | 3899 p->set_next(_thread_list); |
| 3900 _thread_list = p; | |
| 3901 _number_of_threads++; | |
| 3902 oop threadObj = p->threadObj(); | |
| 3903 bool daemon = true; | |
| 3904 // Bootstrapping problem: threadObj can be null for initial | |
| 3905 // JavaThread (or for threads attached via JNI) | |
| 3906 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3907 _number_of_non_daemon_threads++; | |
| 3908 daemon = false; | |
| 3909 } | |
| 3910 | |
| 3911 ThreadService::add_thread(p, daemon); | |
| 3912 | |
| 3913 // Possible GC point. | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4800
diff
changeset
|
3914 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 3915 } |
| 3916 | |
| 3917 void Threads::remove(JavaThread* p) { | |
| 3918 // Extra scope needed for Thread_lock, so we can check | |
| 3919 // that we do not remove thread without safepoint code notice | |
| 3920 { MutexLocker ml(Threads_lock); | |
| 3921 | |
| 3922 assert(includes(p), "p must be present"); | |
| 3923 | |
| 3924 JavaThread* current = _thread_list; | |
| 3925 JavaThread* prev = NULL; | |
| 3926 | |
| 3927 while (current != p) { | |
| 3928 prev = current; | |
| 3929 current = current->next(); | |
| 3930 } | |
| 3931 | |
| 3932 if (prev) { | |
| 3933 prev->set_next(current->next()); | |
| 3934 } else { | |
| 3935 _thread_list = p->next(); | |
| 3936 } | |
| 3937 _number_of_threads--; | |
| 3938 oop threadObj = p->threadObj(); | |
| 3939 bool daemon = true; | |
| 3940 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3941 _number_of_non_daemon_threads--; | |
| 3942 daemon = false; | |
| 3943 | |
| 3944 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3945 // on destroy_vm will wake up. | |
| 3946 if (number_of_non_daemon_threads() == 1) | |
| 3947 Threads_lock->notify_all(); | |
| 3948 } | |
| 3949 ThreadService::remove_thread(p, daemon); | |
| 3950 | |
| 3951 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3952 // the thread might mess around with locks after this point. This can cause it | |
| 3953 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3954 // of this thread since it is removed from the queue. | |
| 3955 p->set_terminated_value(); | |
| 3956 } // unlock Threads_lock | |
| 3957 | |
| 3958 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4800
diff
changeset
|
3959 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 3960 } |
| 3961 | |
| 3962 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3963 bool Threads::includes(JavaThread* p) { | |
| 3964 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3965 ALL_JAVA_THREADS(q) { | |
| 3966 if (q == p ) { | |
| 3967 return true; | |
| 3968 } | |
| 3969 } | |
| 3970 return false; | |
| 3971 } | |
| 3972 | |
| 3973 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3974 // but the garbage collector must provide a safe context for them to run. | |
| 3975 // In particular, these things should never be called when the Threads_lock | |
| 3976 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3977 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3978 // all threads gets blocked when exiting or starting). | |
| 3979 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3980 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3981 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3982 p->oops_do(f, cf); |
| 0 | 3983 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3984 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3985 } |
| 3986 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
3987 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3988 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3989 // root groups. Overhead should be small enough to use all the time, | |
| 3990 // even in sequential code. | |
| 3991 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3992 // Cannot yet substitute active_workers for n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3993 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3994 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3995 // turn off parallelism in process_strong_roots while active_workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3996 // is being used for parallelism elsewhere. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3997 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3998 assert(!is_par || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
3999 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4000 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4001 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4002 ALL_JAVA_THREADS(p) { | |
| 4003 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
|
4004 p->oops_do(f, cf); |
| 0 | 4005 } |
| 4006 } | |
| 4007 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4008 if (vmt->claim_oops_do(is_par, cp)) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4009 vmt->oops_do(f, cf); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4010 } |
| 0 | 4011 } |
| 4012 | |
| 4013 #ifndef SERIALGC | |
| 4014 // Used by ParallelScavenge | |
| 4015 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4016 ALL_JAVA_THREADS(p) { | |
| 4017 q->enqueue(new ThreadRootsTask(p)); | |
| 4018 } | |
| 4019 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4020 } | |
| 4021 | |
| 4022 // Used by Parallel Old | |
| 4023 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4024 ALL_JAVA_THREADS(p) { | |
| 4025 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4026 } | |
| 4027 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4028 } | |
| 4029 #endif // SERIALGC | |
| 4030 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4031 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4032 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4033 p->nmethods_do(cf); |
| 0 | 4034 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4035 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4036 } |
| 4037 | |
| 4038 void Threads::gc_epilogue() { | |
| 4039 ALL_JAVA_THREADS(p) { | |
| 4040 p->gc_epilogue(); | |
| 4041 } | |
| 4042 } | |
| 4043 | |
| 4044 void Threads::gc_prologue() { | |
| 4045 ALL_JAVA_THREADS(p) { | |
| 4046 p->gc_prologue(); | |
| 4047 } | |
| 4048 } | |
| 4049 | |
| 4050 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4051 ALL_JAVA_THREADS(p) { | |
| 4052 p->deoptimized_wrt_marked_nmethods(); | |
| 4053 } | |
| 4054 } | |
| 4055 | |
| 4056 | |
| 4057 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4058 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4059 address monitor, bool doLock) { | |
| 4060 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4061 "must grab Threads_lock or be at safepoint"); | |
| 4062 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4063 | |
| 4064 int i = 0; | |
| 4065 { | |
| 4066 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4067 ALL_JAVA_THREADS(p) { | |
|
4981
1b8d02e10ee8
Remove the hacks around "is_Compiler_thread" assertions; Graal no longer uses the compiler thread mechanisms; don't create a C++ compilation queue or any compiler threads.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
4970
diff
changeset
|
4068 if (p->is_Compiler_thread()) continue; |
| 0 | 4069 |
| 4070 address pending = (address)p->current_pending_monitor(); | |
| 4071 if (pending == monitor) { // found a match | |
| 4072 if (i < count) result->append(p); // save the first count matches | |
| 4073 i++; | |
| 4074 } | |
| 4075 } | |
| 4076 } | |
| 4077 return result; | |
| 4078 } | |
| 4079 | |
| 4080 | |
| 4081 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4082 assert(doLock || | |
| 4083 Threads_lock->owned_by_self() || | |
| 4084 SafepointSynchronize::is_at_safepoint(), | |
| 4085 "must grab Threads_lock or be at safepoint"); | |
| 4086 | |
| 4087 // NULL owner means not locked so we can skip the search | |
| 4088 if (owner == NULL) return NULL; | |
| 4089 | |
| 4090 { | |
| 4091 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4092 ALL_JAVA_THREADS(p) { | |
| 4093 // first, see if owner is the address of a Java thread | |
| 4094 if (owner == (address)p) return p; | |
| 4095 } | |
| 4096 } | |
| 4097 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4098 if (UseHeavyMonitors) return NULL; | |
| 4099 | |
| 4100 // | |
| 4101 // If we didn't find a matching Java thread and we didn't force use of | |
| 4102 // heavyweight monitors, then the owner is the stack address of the | |
| 4103 // Lock Word in the owning Java thread's stack. | |
| 4104 // | |
| 4105 JavaThread* the_owner = NULL; | |
| 4106 { | |
| 4107 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4108 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4109 if (q->is_lock_owned(owner)) { |
| 0 | 4110 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4111 break; |
| 0 | 4112 } |
| 4113 } | |
| 4114 } | |
| 4115 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4116 return the_owner; | |
| 4117 } | |
| 4118 | |
| 4119 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4120 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4121 char buf[32]; | |
| 4122 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4123 | |
| 4124 st->print_cr("Full thread dump %s (%s %s):", | |
| 4125 Abstract_VM_Version::vm_name(), | |
| 4126 Abstract_VM_Version::vm_release(), | |
| 4127 Abstract_VM_Version::vm_info_string() | |
| 4128 ); | |
| 4129 st->cr(); | |
| 4130 | |
| 4131 #ifndef SERIALGC | |
| 4132 // Dump concurrent locks | |
| 4133 ConcurrentLocksDump concurrent_locks; | |
| 4134 if (print_concurrent_locks) { | |
| 4135 concurrent_locks.dump_at_safepoint(); | |
| 4136 } | |
| 4137 #endif // SERIALGC | |
| 4138 | |
| 4139 ALL_JAVA_THREADS(p) { | |
| 4140 ResourceMark rm; | |
| 4141 p->print_on(st); | |
| 4142 if (print_stacks) { | |
| 4143 if (internal_format) { | |
| 4144 p->trace_stack(); | |
| 4145 } else { | |
| 4146 p->print_stack_on(st); | |
| 4147 } | |
| 4148 } | |
| 4149 st->cr(); | |
| 4150 #ifndef SERIALGC | |
| 4151 if (print_concurrent_locks) { | |
| 4152 concurrent_locks.print_locks_on(p, st); | |
| 4153 } | |
| 4154 #endif // SERIALGC | |
| 4155 } | |
| 4156 | |
| 4157 VMThread::vm_thread()->print_on(st); | |
| 4158 st->cr(); | |
| 4159 Universe::heap()->print_gc_threads_on(st); | |
| 4160 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4161 if (wt != NULL) wt->print_on(st); | |
| 4162 st->cr(); | |
| 4163 CompileBroker::print_compiler_threads_on(st); | |
| 4164 st->flush(); | |
| 4165 } | |
| 4166 | |
| 4167 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4168 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4169 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4170 // memory (even in resource area), it might deadlock the error handler. | |
| 4171 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4172 bool found_current = false; | |
| 4173 st->print_cr("Java Threads: ( => current thread )"); | |
| 4174 ALL_JAVA_THREADS(thread) { | |
| 4175 bool is_current = (current == thread); | |
| 4176 found_current = found_current || is_current; | |
| 4177 | |
| 4178 st->print("%s", is_current ? "=>" : " "); | |
| 4179 | |
| 4180 st->print(PTR_FORMAT, thread); | |
| 4181 st->print(" "); | |
| 4182 thread->print_on_error(st, buf, buflen); | |
| 4183 st->cr(); | |
| 4184 } | |
| 4185 st->cr(); | |
| 4186 | |
| 4187 st->print_cr("Other Threads:"); | |
| 4188 if (VMThread::vm_thread()) { | |
| 4189 bool is_current = (current == VMThread::vm_thread()); | |
| 4190 found_current = found_current || is_current; | |
| 4191 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4192 | |
| 4193 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4194 st->print(" "); | |
| 4195 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4196 st->cr(); | |
| 4197 } | |
| 4198 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4199 if (wt != NULL) { | |
| 4200 bool is_current = (current == wt); | |
| 4201 found_current = found_current || is_current; | |
| 4202 st->print("%s", is_current ? "=>" : " "); | |
| 4203 | |
| 4204 st->print(PTR_FORMAT, wt); | |
| 4205 st->print(" "); | |
| 4206 wt->print_on_error(st, buf, buflen); | |
| 4207 st->cr(); | |
| 4208 } | |
| 4209 if (!found_current) { | |
| 4210 st->cr(); | |
| 4211 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4212 current->print_on_error(st, buf, buflen); | |
| 4213 st->cr(); | |
| 4214 } | |
| 4215 } | |
| 4216 | |
| 1878 | 4217 // Internal SpinLock and Mutex |
| 4218 // Based on ParkEvent | |
| 4219 | |
| 4220 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4221 // |
| 1878 | 4222 // We employ SpinLocks _only for low-contention, fixed-length |
| 4223 // short-duration critical sections where we're concerned | |
| 4224 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4225 // The mux construct provides a spin-then-block mutual exclusion | |
| 4226 // mechanism. | |
| 4227 // | |
| 4228 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4229 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4230 // for the JVM to devolve to yielding with little progress. This is true | |
| 4231 // despite the fact that the critical sections protected by ListLock are | |
| 4232 // extremely short. | |
| 0 | 4233 // |
| 1878 | 4234 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4235 // We should make this a 1st-class type, integrated into the lock | |
| 4236 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4237 // should have sufficient padding to avoid false-sharing and excessive | |
| 4238 // cache-coherency traffic. | |
| 4239 | |
| 4240 | |
| 4241 typedef volatile int SpinLockT ; | |
| 4242 | |
| 4243 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4244 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4245 return ; // normal fast-path return | |
| 4246 } | |
| 4247 | |
| 4248 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4249 TEVENT (SpinAcquire - ctx) ; | |
| 4250 int ctr = 0 ; | |
| 4251 int Yields = 0 ; | |
| 0 | 4252 for (;;) { |
| 1878 | 4253 while (*adr != 0) { |
| 4254 ++ctr ; | |
| 4255 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4256 if (Yields > 5) { | |
| 4257 // Consider using a simple NakedSleep() instead. | |
| 4258 // Then SpinAcquire could be called by non-JVM threads | |
| 4259 Thread::current()->_ParkEvent->park(1) ; | |
| 4260 } else { | |
| 4261 os::NakedYield() ; | |
| 4262 ++Yields ; | |
| 4263 } | |
| 4264 } else { | |
| 4265 SpinPause() ; | |
| 0 | 4266 } |
| 1878 | 4267 } |
| 4268 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4269 } |
| 4270 } | |
| 4271 | |
| 1878 | 4272 void Thread::SpinRelease (volatile int * adr) { |
| 4273 assert (*adr != 0, "invariant") ; | |
| 4274 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4275 // Roach-motel semantics. | |
| 4276 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4277 // but prior LDs and STs within the critical section can't be allowed | |
| 4278 // to reorder or float past the ST that releases the lock. | |
| 4279 *adr = 0 ; | |
| 0 | 4280 } |
| 4281 | |
| 1878 | 4282 // muxAcquire and muxRelease: |
| 4283 // | |
| 4284 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4285 // The LSB of the word is set IFF the lock is held. | |
| 4286 // The remainder of the word points to the head of a singly-linked list | |
| 4287 // of threads blocked on the lock. | |
| 4288 // | |
| 4289 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4290 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4291 // minimizing the peak number of extant ParkEvent instances then | |
| 4292 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4293 // as certain invariants were satisfied. Specifically, care would need | |
| 4294 // to be taken with regards to consuming unpark() "permits". | |
| 4295 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4296 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4297 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4298 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4299 // One way around this would be to widen the restricted-range semaphore | |
| 4300 // implemented in park(). Another alternative would be to provide | |
| 4301 // multiple instances of the PlatformEvent() for each thread. One | |
| 4302 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4303 // | |
| 4304 // * Usage: | |
| 4305 // -- Only as leaf locks | |
| 4306 // -- for short-term locking only as muxAcquire does not perform | |
| 4307 // thread state transitions. | |
| 4308 // | |
| 4309 // Alternatives: | |
| 4310 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4311 // but with parking or spin-then-park instead of pure spinning. | |
| 4312 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4313 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4314 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4315 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4316 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4317 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4318 // boundaries by using placement-new. | |
| 4319 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4320 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4321 // The validity of the backlinks must be ratified before we trust the value. | |
| 4322 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4323 // the forward links, which are always trustworthy. | |
| 4324 // * Add a successor indication. The LockWord is currently encoded as | |
| 4325 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4326 // to provide the usual futile-wakeup optimization. | |
| 4327 // See RTStt for details. | |
| 4328 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4329 // | |
| 4330 | |
| 4331 | |
| 4332 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4333 enum MuxBits { LOCKBIT = 1 } ; | |
| 4334 | |
| 4335 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4336 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4337 if (w == 0) return ; | |
| 4338 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4339 return ; | |
| 4340 } | |
| 4341 | |
| 4342 TEVENT (muxAcquire - Contention) ; | |
| 4343 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4344 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4345 for (;;) { |
| 1878 | 4346 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4347 | |
| 4348 // Optional spin phase: spin-then-park strategy | |
| 4349 while (--its >= 0) { | |
| 4350 w = *Lock ; | |
| 4351 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4352 return ; | |
| 4353 } | |
| 4354 } | |
| 4355 | |
| 4356 Self->reset() ; | |
| 4357 Self->OnList = intptr_t(Lock) ; | |
| 4358 // The following fence() isn't _strictly necessary as the subsequent | |
| 4359 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4360 OrderAccess::fence(); | |
| 4361 for (;;) { | |
| 4362 w = *Lock ; | |
| 4363 if ((w & LOCKBIT) == 0) { | |
| 4364 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4365 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4366 return ; | |
| 4367 } | |
| 4368 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4369 } |
| 1878 | 4370 assert (w & LOCKBIT, "invariant") ; |
| 4371 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4372 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4373 } | |
| 4374 | |
| 4375 while (Self->OnList != 0) { | |
| 4376 Self->park() ; | |
| 4377 } | |
| 0 | 4378 } |
| 4379 } | |
| 4380 | |
| 1878 | 4381 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4382 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4383 if (w == 0) return ; | |
| 4384 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4385 return ; | |
| 4386 } | |
| 4387 | |
| 4388 TEVENT (muxAcquire - Contention) ; | |
| 4389 ParkEvent * ReleaseAfter = NULL ; | |
| 4390 if (ev == NULL) { | |
| 4391 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4392 } | |
| 4393 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4394 for (;;) { | |
| 4395 guarantee (ev->OnList == 0, "invariant") ; | |
| 4396 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4397 | |
| 4398 // Optional spin phase: spin-then-park strategy | |
| 4399 while (--its >= 0) { | |
| 4400 w = *Lock ; | |
| 4401 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4402 if (ReleaseAfter != NULL) { | |
| 4403 ParkEvent::Release (ReleaseAfter) ; | |
| 4404 } | |
| 4405 return ; | |
| 4406 } | |
| 4407 } | |
| 4408 | |
| 4409 ev->reset() ; | |
| 4410 ev->OnList = intptr_t(Lock) ; | |
| 4411 // The following fence() isn't _strictly necessary as the subsequent | |
| 4412 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4413 OrderAccess::fence(); | |
| 4414 for (;;) { | |
| 4415 w = *Lock ; | |
| 4416 if ((w & LOCKBIT) == 0) { | |
| 4417 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4418 ev->OnList = 0 ; | |
| 4419 // We call ::Release while holding the outer lock, thus | |
| 4420 // artificially lengthening the critical section. | |
| 4421 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4422 // after we've dropped the outer lock. | |
| 4423 if (ReleaseAfter != NULL) { | |
| 4424 ParkEvent::Release (ReleaseAfter) ; | |
| 4425 } | |
| 4426 return ; | |
| 4427 } | |
| 4428 continue ; // Interference -- *Lock changed -- Just retry | |
| 4429 } | |
| 4430 assert (w & LOCKBIT, "invariant") ; | |
| 4431 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4432 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4433 } | |
| 4434 | |
| 4435 while (ev->OnList != 0) { | |
| 4436 ev->park() ; | |
| 4437 } | |
| 4438 } | |
| 4439 } | |
| 4440 | |
| 4441 // Release() must extract a successor from the list and then wake that thread. | |
| 4442 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4443 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4444 // Release() would : | |
| 4445 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4446 // (B) Extract a successor from the private list "in-hand" | |
| 4447 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4448 // If there were any newly arrived threads and the CAS() would fail. | |
| 4449 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4450 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4451 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4452 // The wakee would be responsible for reattaching and remerging before it | |
| 4453 // competed for the lock. | |
| 4454 // | |
| 4455 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4456 // multiple concurrent pushers, but only one popper or detacher. | |
| 4457 // This implementation pops from the head of the list. This is unfair, | |
| 4458 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4459 // (We wake recently run threads first). | |
| 4460 | |
| 4461 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4462 for (;;) { | |
| 4463 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4464 assert (w & LOCKBIT, "invariant") ; | |
| 4465 if (w == LOCKBIT) return ; | |
| 4466 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4467 assert (List != NULL, "invariant") ; | |
| 4468 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4469 ParkEvent * nxt = List->ListNext ; | |
| 4470 | |
| 4471 // The following CAS() releases the lock and pops the head element. | |
| 4472 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4473 continue ; | |
| 4474 } | |
| 4475 List->OnList = 0 ; | |
| 4476 OrderAccess::fence() ; | |
| 4477 List->unpark () ; | |
| 4478 return ; | |
| 4479 } | |
| 4480 } | |
| 4481 | |
| 4482 | |
| 0 | 4483 void Threads::verify() { |
| 4484 ALL_JAVA_THREADS(p) { | |
| 4485 p->verify(); | |
| 4486 } | |
| 4487 VMThread* thread = VMThread::vm_thread(); | |
| 4488 if (thread != NULL) thread->verify(); | |
| 4489 } |