Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 14465:28f281e8de1d
Merge
| author | kvn |
|---|---|
| date | Thu, 20 Feb 2014 12:20:56 -0800 |
| parents | e6195383bcaf 8a9bb7821e28 |
| children | f460c6926af7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
| 1972 | 38 #include "memory/oopFactory.hpp" |
| 39 #include "memory/universe.inline.hpp" | |
| 40 #include "oops/instanceKlass.hpp" | |
| 41 #include "oops/objArrayOop.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
| 1972 | 44 #include "prims/jvm_misc.hpp" |
| 45 #include "prims/jvmtiExport.hpp" | |
| 46 #include "prims/jvmtiThreadState.hpp" | |
| 47 #include "prims/privilegedStack.hpp" | |
| 48 #include "runtime/arguments.hpp" | |
| 49 #include "runtime/biasedLocking.hpp" | |
| 50 #include "runtime/deoptimization.hpp" | |
| 51 #include "runtime/fprofiler.hpp" | |
| 52 #include "runtime/frame.inline.hpp" | |
| 53 #include "runtime/init.hpp" | |
| 54 #include "runtime/interfaceSupport.hpp" | |
| 55 #include "runtime/java.hpp" | |
| 56 #include "runtime/javaCalls.hpp" | |
| 57 #include "runtime/jniPeriodicChecker.hpp" | |
| 58 #include "runtime/memprofiler.hpp" | |
| 59 #include "runtime/mutexLocker.hpp" | |
| 60 #include "runtime/objectMonitor.hpp" | |
| 61 #include "runtime/osThread.hpp" | |
| 62 #include "runtime/safepoint.hpp" | |
| 63 #include "runtime/sharedRuntime.hpp" | |
| 64 #include "runtime/statSampler.hpp" | |
| 65 #include "runtime/stubRoutines.hpp" | |
| 66 #include "runtime/task.hpp" | |
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67 #include "runtime/thread.inline.hpp" |
| 1972 | 68 #include "runtime/threadCritical.hpp" |
| 69 #include "runtime/threadLocalStorage.hpp" | |
| 70 #include "runtime/vframe.hpp" | |
| 71 #include "runtime/vframeArray.hpp" | |
| 72 #include "runtime/vframe_hp.hpp" | |
| 73 #include "runtime/vmThread.hpp" | |
| 74 #include "runtime/vm_operations.hpp" | |
| 75 #include "services/attachListener.hpp" | |
| 76 #include "services/management.hpp" | |
| 6197 | 77 #include "services/memTracker.hpp" |
| 1972 | 78 #include "services/threadService.hpp" |
| 10405 | 79 #include "trace/tracing.hpp" |
| 80 #include "trace/traceMacros.hpp" | |
| 1972 | 81 #include "utilities/defaultStream.hpp" |
| 82 #include "utilities/dtrace.hpp" | |
| 83 #include "utilities/events.hpp" | |
| 84 #include "utilities/preserveException.hpp" | |
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85 #include "utilities/macros.hpp" |
| 1972 | 86 #ifdef TARGET_OS_FAMILY_linux |
| 87 # include "os_linux.inline.hpp" | |
| 88 #endif | |
| 89 #ifdef TARGET_OS_FAMILY_solaris | |
| 90 # include "os_solaris.inline.hpp" | |
| 91 #endif | |
| 92 #ifdef TARGET_OS_FAMILY_windows | |
| 93 # include "os_windows.inline.hpp" | |
| 94 #endif | |
| 3960 | 95 #ifdef TARGET_OS_FAMILY_bsd |
| 96 # include "os_bsd.inline.hpp" | |
| 97 #endif | |
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98 #if INCLUDE_ALL_GCS |
| 1972 | 99 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
| 100 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 101 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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102 #endif // INCLUDE_ALL_GCS |
| 1972 | 103 #ifdef COMPILER1 |
| 104 #include "c1/c1_Compiler.hpp" | |
| 105 #endif | |
| 106 #ifdef COMPILER2 | |
| 107 #include "opto/c2compiler.hpp" | |
| 108 #include "opto/idealGraphPrinter.hpp" | |
| 109 #endif | |
| 0 | 110 |
| 111 #ifdef DTRACE_ENABLED | |
| 112 | |
| 113 // Only bother with this argument setup if dtrace is available | |
| 114 | |
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115 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_START |
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116 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_STOP |
| 4006 | 117 |
| 118 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 119 { \ | |
| 120 ResourceMark rm(this); \ | |
| 121 int len = 0; \ | |
| 122 const char* name = (javathread)->get_thread_name(); \ | |
| 123 len = strlen(name); \ | |
| 124 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 125 (char *) name, len, \ | |
| 126 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 127 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 128 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 129 } | |
| 130 | |
| 0 | 131 #else // ndef DTRACE_ENABLED |
| 132 | |
| 133 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 134 | |
| 135 #endif // ndef DTRACE_ENABLED | |
| 136 | |
| 6197 | 137 |
| 0 | 138 // Class hierarchy |
| 139 // - Thread | |
| 140 // - VMThread | |
| 141 // - WatcherThread | |
| 142 // - ConcurrentMarkSweepThread | |
| 143 // - JavaThread | |
| 144 // - CompilerThread | |
| 145 | |
| 146 // ======= Thread ======== | |
| 147 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 148 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 149 if (UseBiasedLocking) { |
| 150 const int alignment = markOopDesc::biased_lock_alignment; | |
| 151 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 152 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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153 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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154 AllocFailStrategy::RETURN_NULL); |
| 0 | 155 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 156 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 157 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 158 "JavaThread alignment code overflowed allocated storage"); | |
| 159 if (TraceBiasedLocking) { | |
| 160 if (aligned_addr != real_malloc_addr) | |
| 161 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 162 real_malloc_addr, aligned_addr); | |
| 163 } | |
| 164 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 165 return aligned_addr; | |
| 166 } else { | |
| 6197 | 167 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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168 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 169 } |
| 170 } | |
| 171 | |
| 172 void Thread::operator delete(void* p) { | |
| 173 if (UseBiasedLocking) { | |
| 174 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 175 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 176 } else { |
| 6197 | 177 FreeHeap(p, mtThread); |
| 0 | 178 } |
| 179 } | |
| 180 | |
| 181 | |
| 182 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 183 // JavaThread | |
| 184 | |
| 185 | |
| 186 Thread::Thread() { | |
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187 // stack and get_thread |
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188 set_stack_base(NULL); |
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189 set_stack_size(0); |
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190 set_self_raw_id(0); |
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191 set_lgrp_id(-1); |
| 0 | 192 |
| 193 // allocated data structures | |
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194 set_osthread(NULL); |
| 6197 | 195 set_resource_area(new (mtThread)ResourceArea()); |
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196 DEBUG_ONLY(_current_resource_mark = NULL;) |
| 6197 | 197 set_handle_area(new (mtThread) HandleArea(NULL)); |
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198 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
| 0 | 199 set_active_handles(NULL); |
| 200 set_free_handle_block(NULL); | |
| 201 set_last_handle_mark(NULL); | |
| 202 | |
| 203 // This initial value ==> never claimed. | |
| 204 _oops_do_parity = 0; | |
| 205 | |
| 206 // the handle mark links itself to last_handle_mark | |
| 10135 | 207 new HandleMark(this); |
| 208 | |
| 0 | 209 // plain initialization |
| 210 debug_only(_owned_locks = NULL;) | |
| 211 debug_only(_allow_allocation_count = 0;) | |
| 212 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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213 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 214 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 215 _jvmti_env_iteration_count = 0; | |
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216 set_allocated_bytes(0); |
| 0 | 217 _vm_operation_started_count = 0; |
| 218 _vm_operation_completed_count = 0; | |
| 219 _current_pending_monitor = NULL; | |
| 220 _current_pending_monitor_is_from_java = true; | |
| 221 _current_waiting_monitor = NULL; | |
| 222 _num_nested_signal = 0; | |
| 223 omFreeList = NULL ; | |
| 224 omFreeCount = 0 ; | |
| 225 omFreeProvision = 32 ; | |
| 1587 | 226 omInUseList = NULL ; |
| 227 omInUseCount = 0 ; | |
| 0 | 228 |
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229 #ifdef ASSERT |
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230 _visited_for_critical_count = false; |
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231 #endif |
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232 |
| 0 | 233 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 234 _suspend_flags = 0; | |
| 235 | |
| 236 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 237 _hashStateX = os::random() ; | |
| 238 _hashStateY = 842502087 ; | |
| 239 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 240 _hashStateW = 273326509 ; | |
| 241 | |
| 242 _OnTrap = 0 ; | |
| 243 _schedctl = NULL ; | |
| 244 _Stalled = 0 ; | |
| 245 _TypeTag = 0x2BAD ; | |
| 246 | |
| 247 // Many of the following fields are effectively final - immutable | |
| 248 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 249 // construct until the _MutexEvent is initialized ... | |
| 250 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 251 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 252 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 253 // and ::Release() | |
| 254 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 255 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 256 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 257 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 258 | |
| 259 #ifdef CHECK_UNHANDLED_OOPS | |
| 260 if (CheckUnhandledOops) { | |
| 261 _unhandled_oops = new UnhandledOops(this); | |
| 262 } | |
| 263 #endif // CHECK_UNHANDLED_OOPS | |
| 264 #ifdef ASSERT | |
| 265 if (UseBiasedLocking) { | |
| 266 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 267 assert(this == _real_malloc_address || | |
| 268 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 269 "bug in forced alignment of thread objects"); | |
| 270 } | |
| 271 #endif /* ASSERT */ | |
| 272 } | |
| 273 | |
| 274 void Thread::initialize_thread_local_storage() { | |
| 275 // Note: Make sure this method only calls | |
| 276 // non-blocking operations. Otherwise, it might not work | |
| 277 // with the thread-startup/safepoint interaction. | |
| 278 | |
| 279 // During Java thread startup, safepoint code should allow this | |
| 280 // method to complete because it may need to allocate memory to | |
| 281 // store information for the new thread. | |
| 282 | |
| 283 // initialize structure dependent on thread local storage | |
| 284 ThreadLocalStorage::set_thread(this); | |
| 285 } | |
| 286 | |
| 287 void Thread::record_stack_base_and_size() { | |
| 288 set_stack_base(os::current_stack_base()); | |
| 289 set_stack_size(os::current_stack_size()); | |
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290 if (is_Java_thread()) { |
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291 ((JavaThread*) this)->set_stack_overflow_limit(); |
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292 } |
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293 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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294 // in initialize_thread(). Without the adjustment, stack size is |
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295 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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296 // So far, only Solaris has real implementation of initialize_thread(). |
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297 // |
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298 // set up any platform-specific state. |
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299 os::initialize_thread(this); |
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300 |
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301 #if INCLUDE_NMT |
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302 // record thread's native stack, stack grows downward |
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303 address stack_low_addr = stack_base() - stack_size(); |
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304 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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305 CURRENT_PC); |
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306 #endif // INCLUDE_NMT |
| 0 | 307 } |
| 308 | |
| 309 | |
| 310 Thread::~Thread() { | |
| 311 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 312 ObjectSynchronizer::omFlush (this) ; | |
| 313 | |
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314 EVENT_THREAD_DESTRUCT(this); |
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315 |
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316 // stack_base can be NULL if the thread is never started or exited before |
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317 // record_stack_base_and_size called. Although, we would like to ensure |
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318 // that all started threads do call record_stack_base_and_size(), there is |
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319 // not proper way to enforce that. |
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320 #if INCLUDE_NMT |
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321 if (_stack_base != NULL) { |
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322 address low_stack_addr = stack_base() - stack_size(); |
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323 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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324 #ifdef ASSERT |
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325 set_stack_base(NULL); |
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326 #endif |
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327 } |
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328 #endif // INCLUDE_NMT |
| 6197 | 329 |
| 0 | 330 // deallocate data structures |
| 331 delete resource_area(); | |
| 332 // since the handle marks are using the handle area, we have to deallocated the root | |
| 333 // handle mark before deallocating the thread's handle area, | |
| 334 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 10135 | 335 delete last_handle_mark(); |
| 336 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 0 | 337 |
| 338 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 339 // We NULL out the fields for good hygiene. | |
| 340 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 341 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 342 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 343 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 344 | |
| 345 delete handle_area(); | |
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346 delete metadata_handles(); |
| 0 | 347 |
| 348 // osthread() can be NULL, if creation of thread failed. | |
| 349 if (osthread() != NULL) os::free_thread(osthread()); | |
| 350 | |
| 351 delete _SR_lock; | |
| 352 | |
| 353 // clear thread local storage if the Thread is deleting itself | |
| 354 if (this == Thread::current()) { | |
| 355 ThreadLocalStorage::set_thread(NULL); | |
| 356 } else { | |
| 357 // In the case where we're not the current thread, invalidate all the | |
| 358 // caches in case some code tries to get the current thread or the | |
| 359 // thread that was destroyed, and gets stale information. | |
| 360 ThreadLocalStorage::invalidate_all(); | |
| 361 } | |
| 362 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 363 } | |
| 364 | |
| 365 // NOTE: dummy function for assertion purpose. | |
| 366 void Thread::run() { | |
| 367 ShouldNotReachHere(); | |
| 368 } | |
| 369 | |
| 370 #ifdef ASSERT | |
| 371 // Private method to check for dangling thread pointer | |
| 372 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 373 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 374 "possibility of dangling Thread pointer"); | |
| 375 } | |
| 376 #endif | |
| 377 | |
| 378 | |
| 379 #ifndef PRODUCT | |
| 380 // Tracing method for basic thread operations | |
| 381 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 382 if (!TraceThreadEvents) return; | |
| 383 ResourceMark rm; | |
| 384 ThreadCritical tc; | |
| 385 const char *name = "non-Java thread"; | |
| 386 int prio = -1; | |
| 387 if (thread->is_Java_thread() | |
| 388 && !thread->is_Compiler_thread()) { | |
| 389 // The Threads_lock must be held to get information about | |
| 390 // this thread but may not be in some situations when | |
| 391 // tracing thread events. | |
| 392 bool release_Threads_lock = false; | |
| 393 if (!Threads_lock->owned_by_self()) { | |
| 394 Threads_lock->lock(); | |
| 395 release_Threads_lock = true; | |
| 396 } | |
| 397 JavaThread* jt = (JavaThread *)thread; | |
| 398 name = (char *)jt->get_thread_name(); | |
| 399 oop thread_oop = jt->threadObj(); | |
| 400 if (thread_oop != NULL) { | |
| 401 prio = java_lang_Thread::priority(thread_oop); | |
| 402 } | |
| 403 if (release_Threads_lock) { | |
| 404 Threads_lock->unlock(); | |
| 405 } | |
| 406 } | |
| 407 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 408 } | |
| 409 #endif | |
| 410 | |
| 411 | |
| 412 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 413 trace("get priority", thread); | |
| 414 ThreadPriority priority; | |
| 415 // Can return an error! | |
| 416 (void)os::get_priority(thread, priority); | |
| 417 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 418 return priority; | |
| 419 } | |
| 420 | |
| 421 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 422 trace("set priority", thread); | |
| 423 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 424 // Can return an error! | |
| 425 (void)os::set_priority(thread, priority); | |
| 426 } | |
| 427 | |
| 428 | |
| 429 void Thread::start(Thread* thread) { | |
| 430 trace("start", thread); | |
| 431 // Start is different from resume in that its safety is guaranteed by context or | |
| 432 // being called from a Java method synchronized on the Thread object. | |
| 433 if (!DisableStartThread) { | |
| 434 if (thread->is_Java_thread()) { | |
| 435 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 436 // Can not set it after the thread started because we do not know the | |
| 437 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 438 // in SLEEPING or some other state. | |
| 439 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 440 java_lang_Thread::RUNNABLE); | |
| 441 } | |
| 442 os::start_thread(thread); | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 447 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 448 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 449 VMThread::execute(vm_stop); | |
| 450 } | |
| 451 | |
| 452 | |
| 453 // | |
| 454 // Check if an external suspend request has completed (or has been | |
| 455 // cancelled). Returns true if the thread is externally suspended and | |
| 456 // false otherwise. | |
| 457 // | |
| 458 // The bits parameter returns information about the code path through | |
| 459 // the routine. Useful for debugging: | |
| 460 // | |
| 461 // set in is_ext_suspend_completed(): | |
| 462 // 0x00000001 - routine was entered | |
| 463 // 0x00000010 - routine return false at end | |
| 464 // 0x00000100 - thread exited (return false) | |
| 465 // 0x00000200 - suspend request cancelled (return false) | |
| 466 // 0x00000400 - thread suspended (return true) | |
| 467 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 468 // 0x00002000 - thread is native and walkable (return true) | |
| 469 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 470 // | |
| 471 // set in wait_for_ext_suspend_completion(): | |
| 472 // 0x00010000 - routine was entered | |
| 473 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 474 // 0x00040000 - thread suspended before loop (return true) | |
| 475 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 476 // 0x00100000 - thread suspended in loop (return true) | |
| 477 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 478 // | |
| 479 | |
| 480 // Helper class for tracing suspend wait debug bits. | |
| 481 // | |
| 482 // 0x00000100 indicates that the target thread exited before it could | |
| 483 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 484 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 485 // count as wait failures either. | |
| 486 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 487 | |
| 488 class TraceSuspendDebugBits : public StackObj { | |
| 489 private: | |
| 490 JavaThread * jt; | |
| 491 bool is_wait; | |
| 492 bool called_by_wait; // meaningful when !is_wait | |
| 493 uint32_t * bits; | |
| 494 | |
| 495 public: | |
| 496 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 497 uint32_t *_bits) { | |
| 498 jt = _jt; | |
| 499 is_wait = _is_wait; | |
| 500 called_by_wait = _called_by_wait; | |
| 501 bits = _bits; | |
| 502 } | |
| 503 | |
| 504 ~TraceSuspendDebugBits() { | |
| 505 if (!is_wait) { | |
| 506 #if 1 | |
| 507 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 508 // That trace is very chatty. | |
| 509 return; | |
| 510 #else | |
| 511 if (!called_by_wait) { | |
| 512 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 513 // trace calls to it from wait_for_ext_suspend_completion() | |
| 514 return; | |
| 515 } | |
| 516 #endif | |
| 517 } | |
| 518 | |
| 519 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 520 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 521 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 522 ResourceMark rm; | |
| 523 | |
| 524 tty->print_cr( | |
| 525 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 526 jt->get_thread_name(), *bits); | |
| 527 | |
| 528 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 529 } | |
| 530 } | |
| 531 } | |
| 532 }; | |
| 533 #undef DEBUG_FALSE_BITS | |
| 534 | |
| 535 | |
| 536 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 537 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 538 | |
| 539 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 540 bool do_trans_retry; // flag to force the retry | |
| 541 | |
| 542 *bits |= 0x00000001; | |
| 543 | |
| 544 do { | |
| 545 do_trans_retry = false; | |
| 546 | |
| 547 if (is_exiting()) { | |
| 548 // Thread is in the process of exiting. This is always checked | |
| 549 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 550 *bits |= 0x00000100; | |
| 551 return false; | |
| 552 } | |
| 553 | |
| 554 if (!is_external_suspend()) { | |
| 555 // Suspend request is cancelled. This is always checked before | |
| 556 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 557 // confusing the thread that made the suspend request. | |
| 558 *bits |= 0x00000200; | |
| 559 return false; | |
| 560 } | |
| 561 | |
| 562 if (is_ext_suspended()) { | |
| 563 // thread is suspended | |
| 564 *bits |= 0x00000400; | |
| 565 return true; | |
| 566 } | |
| 567 | |
| 568 // Now that we no longer do hard suspends of threads running | |
| 569 // native code, the target thread can be changing thread state | |
| 570 // while we are in this routine: | |
| 571 // | |
| 572 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 573 // | |
| 574 // We save a copy of the thread state as observed at this moment | |
| 575 // and make our decision about suspend completeness based on the | |
| 576 // copy. This closes the race where the thread state is seen as | |
| 577 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 578 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 579 JavaThreadState save_state = thread_state(); | |
| 580 | |
| 581 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 582 // If the thread's state is _thread_blocked and this blocking | |
| 583 // condition is known to be equivalent to a suspend, then we can | |
| 584 // consider the thread to be externally suspended. This means that | |
| 585 // the code that sets _thread_blocked has been modified to do | |
| 586 // self-suspension if the blocking condition releases. We also | |
| 587 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 588 // the _thread_blocked with self-suspension check. | |
| 589 // | |
| 590 // Return true since we wouldn't be here unless there was still an | |
| 591 // external suspend request. | |
| 592 *bits |= 0x00001000; | |
| 593 return true; | |
| 594 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 595 // Threads running native code will self-suspend on native==>VM/Java | |
| 596 // transitions. If its stack is walkable (should always be the case | |
| 597 // unless this function is called before the actual java_suspend() | |
| 598 // call), then the wait is done. | |
| 599 *bits |= 0x00002000; | |
| 600 return true; | |
| 601 } else if (!called_by_wait && !did_trans_retry && | |
| 602 save_state == _thread_in_native_trans && | |
| 603 frame_anchor()->walkable()) { | |
| 604 // The thread is transitioning from thread_in_native to another | |
| 605 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 606 // will force the thread to self-suspend. If it hasn't gotten | |
| 607 // there yet we may have caught the thread in-between the native | |
| 608 // code check above and the self-suspend. Lucky us. If we were | |
| 609 // called by wait_for_ext_suspend_completion(), then it | |
| 610 // will be doing the retries so we don't have to. | |
| 611 // | |
| 612 // Since we use the saved thread state in the if-statement above, | |
| 613 // there is a chance that the thread has already transitioned to | |
| 614 // _thread_blocked by the time we get here. In that case, we will | |
| 615 // make a single unnecessary pass through the logic below. This | |
| 616 // doesn't hurt anything since we still do the trans retry. | |
| 617 | |
| 618 *bits |= 0x00004000; | |
| 619 | |
| 620 // Once the thread leaves thread_in_native_trans for another | |
| 621 // thread state, we break out of this retry loop. We shouldn't | |
| 622 // need this flag to prevent us from getting back here, but | |
| 623 // sometimes paranoia is good. | |
| 624 did_trans_retry = true; | |
| 625 | |
| 626 // We wait for the thread to transition to a more usable state. | |
| 627 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 628 // We used to do an "os::yield_all(i)" call here with the intention | |
| 629 // that yielding would increase on each retry. However, the parameter | |
| 630 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 631 // on the SR_lock below provides a much more predictable scale up for | |
| 632 // the delay. It also provides a simple/direct point to check for any | |
| 633 // safepoint requests from the VMThread | |
| 634 | |
| 635 // temporarily drops SR_lock while doing wait with safepoint check | |
| 636 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 637 // and increase delay with each retry | |
| 638 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 639 | |
| 640 // check the actual thread state instead of what we saved above | |
| 641 if (thread_state() != _thread_in_native_trans) { | |
| 642 // the thread has transitioned to another thread state so | |
| 643 // try all the checks (except this one) one more time. | |
| 644 do_trans_retry = true; | |
| 645 break; | |
| 646 } | |
| 647 } // end retry loop | |
| 648 | |
| 649 | |
| 650 } | |
| 651 } while (do_trans_retry); | |
| 652 | |
| 653 *bits |= 0x00000010; | |
| 654 return false; | |
| 655 } | |
| 656 | |
| 657 // | |
| 658 // Wait for an external suspend request to complete (or be cancelled). | |
| 659 // Returns true if the thread is externally suspended and false otherwise. | |
| 660 // | |
| 661 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 662 uint32_t *bits) { | |
| 663 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 664 false /* !called_by_wait */, bits); | |
| 665 | |
| 666 // local flag copies to minimize SR_lock hold time | |
| 667 bool is_suspended; | |
| 668 bool pending; | |
| 669 uint32_t reset_bits; | |
| 670 | |
| 671 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 672 *bits |= 0x00010000; | |
| 673 | |
| 674 // We use reset_bits to reinitialize the bits value at the top of | |
| 675 // each retry loop. This allows the caller to make use of any | |
| 676 // unused bits for their own marking purposes. | |
| 677 reset_bits = *bits; | |
| 678 | |
| 679 { | |
| 680 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 681 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 682 delay, bits); | |
| 683 pending = is_external_suspend(); | |
| 684 } | |
| 685 // must release SR_lock to allow suspension to complete | |
| 686 | |
| 687 if (!pending) { | |
| 688 // A cancelled suspend request is the only false return from | |
| 689 // is_ext_suspend_completed() that keeps us from entering the | |
| 690 // retry loop. | |
| 691 *bits |= 0x00020000; | |
| 692 return false; | |
| 693 } | |
| 694 | |
| 695 if (is_suspended) { | |
| 696 *bits |= 0x00040000; | |
| 697 return true; | |
| 698 } | |
| 699 | |
| 700 for (int i = 1; i <= retries; i++) { | |
| 701 *bits = reset_bits; // reinit to only track last retry | |
| 702 | |
| 703 // We used to do an "os::yield_all(i)" call here with the intention | |
| 704 // that yielding would increase on each retry. However, the parameter | |
| 705 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 706 // on the SR_lock below provides a much more predictable scale up for | |
| 707 // the delay. It also provides a simple/direct point to check for any | |
| 708 // safepoint requests from the VMThread | |
| 709 | |
| 710 { | |
| 711 MutexLocker ml(SR_lock()); | |
| 712 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 713 // can also call this) and increase delay with each retry | |
| 714 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 715 | |
| 716 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 717 delay, bits); | |
| 718 | |
| 719 // It is possible for the external suspend request to be cancelled | |
| 720 // (by a resume) before the actual suspend operation is completed. | |
| 721 // Refresh our local copy to see if we still need to wait. | |
| 722 pending = is_external_suspend(); | |
| 723 } | |
| 724 | |
| 725 if (!pending) { | |
| 726 // A cancelled suspend request is the only false return from | |
| 727 // is_ext_suspend_completed() that keeps us from staying in the | |
| 728 // retry loop. | |
| 729 *bits |= 0x00080000; | |
| 730 return false; | |
| 731 } | |
| 732 | |
| 733 if (is_suspended) { | |
| 734 *bits |= 0x00100000; | |
| 735 return true; | |
| 736 } | |
| 737 } // end retry loop | |
| 738 | |
| 739 // thread did not suspend after all our retries | |
| 740 *bits |= 0x00200000; | |
| 741 return false; | |
| 742 } | |
| 743 | |
| 744 #ifndef PRODUCT | |
| 745 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 746 | |
| 747 // This should not need to be atomic as the only way for simultaneous | |
| 14309 | 748 // updates is via interrupts. Even then this should be rare or non-existent |
| 0 | 749 // and we don't care that much anyway. |
| 750 | |
| 751 int index = _jmp_ring_index; | |
| 752 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 753 _jmp_ring[index]._target = (intptr_t) target; | |
| 754 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 755 _jmp_ring[index]._file = file; | |
| 756 _jmp_ring[index]._line = line; | |
| 757 } | |
| 758 #endif /* PRODUCT */ | |
| 759 | |
| 760 // Called by flat profiler | |
| 761 // Callers have already called wait_for_ext_suspend_completion | |
| 762 // The assertion for that is currently too complex to put here: | |
| 763 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 764 bool gotframe = false; | |
| 765 // self suspension saves needed state. | |
| 766 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 767 *_fr = pd_last_frame(); | |
| 768 gotframe = true; | |
| 769 } | |
| 770 return gotframe; | |
| 771 } | |
| 772 | |
| 773 void Thread::interrupt(Thread* thread) { | |
| 774 trace("interrupt", thread); | |
| 775 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 776 os::interrupt(thread); | |
| 777 } | |
| 778 | |
| 779 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 780 trace("is_interrupted", thread); | |
| 781 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 782 // Note: If clear_interrupted==false, this simply fetches and | |
| 783 // returns the value of the field osthread()->interrupted(). | |
| 784 return os::is_interrupted(thread, clear_interrupted); | |
| 785 } | |
| 786 | |
| 787 | |
| 788 // GC Support | |
| 789 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 790 jint thread_parity = _oops_do_parity; | |
| 791 if (thread_parity != strong_roots_parity) { | |
| 792 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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793 if (res == thread_parity) { |
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794 return true; |
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795 } else { |
| 0 | 796 guarantee(res == strong_roots_parity, "Or else what?"); |
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797 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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798 "Should only fail when parallel."); |
| 0 | 799 return false; |
| 800 } | |
| 801 } | |
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802 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 803 "Should only fail when parallel."); |
| 804 return false; | |
| 805 } | |
| 806 | |
|
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807 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 808 active_handles()->oops_do(f); |
| 809 // Do oop for ThreadShadow | |
| 810 f->do_oop((oop*)&_pending_exception); | |
| 811 handle_area()->oops_do(f); | |
| 812 } | |
| 813 | |
|
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814 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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815 // no nmethods in a generic thread... |
| 0 | 816 } |
| 817 | |
|
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818 void Thread::metadata_do(void f(Metadata*)) { |
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819 if (metadata_handles() != NULL) { |
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820 for (int i = 0; i< metadata_handles()->length(); i++) { |
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821 f(metadata_handles()->at(i)); |
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822 } |
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823 } |
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824 } |
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825 |
| 0 | 826 void Thread::print_on(outputStream* st) const { |
| 827 // get_priority assumes osthread initialized | |
| 828 if (osthread() != NULL) { | |
| 6766 | 829 int os_prio; |
| 830 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 831 st->print("os_prio=%d ", os_prio); | |
| 832 } | |
| 833 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 834 osthread()->print_on(st); |
| 835 } | |
| 836 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 837 } | |
| 838 | |
| 839 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 840 // any lock or allocate memory. | |
| 841 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 842 if (is_VM_thread()) st->print("VMThread"); | |
| 843 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 844 else if (is_Java_thread()) st->print("JavaThread"); | |
| 845 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 846 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 847 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 848 else st->print("Thread"); | |
| 849 | |
| 850 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 851 _stack_base - _stack_size, _stack_base); | |
| 852 | |
| 853 if (osthread()) { | |
| 854 st->print(" [id=%d]", osthread()->thread_id()); | |
| 855 } | |
| 856 } | |
| 857 | |
| 858 #ifdef ASSERT | |
| 859 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 860 Monitor *cur = _owned_locks; | |
| 861 if (cur == NULL) { | |
| 862 st->print(" (no locks) "); | |
| 863 } else { | |
| 864 st->print_cr(" Locks owned:"); | |
| 865 while(cur) { | |
| 866 cur->print_on(st); | |
| 867 cur = cur->next(); | |
| 868 } | |
| 869 } | |
| 870 } | |
| 871 | |
| 872 static int ref_use_count = 0; | |
| 873 | |
| 874 bool Thread::owns_locks_but_compiled_lock() const { | |
| 875 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 876 if (cur != Compile_lock) return true; | |
| 877 } | |
| 878 return false; | |
| 879 } | |
| 880 | |
| 881 | |
| 882 #endif | |
| 883 | |
| 884 #ifndef PRODUCT | |
| 885 | |
| 886 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 887 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 888 // no threads which allow_vm_block's are held | |
| 889 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 890 // Check if current thread is allowed to block at a safepoint | |
| 891 if (!(_allow_safepoint_count == 0)) | |
| 892 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 893 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 894 fatal("LEAF method calling lock?"); | |
| 895 } | |
| 896 | |
| 897 #ifdef ASSERT | |
| 898 if (potential_vm_operation && is_Java_thread() | |
| 899 && !Universe::is_bootstrapping()) { | |
| 900 // Make sure we do not hold any locks that the VM thread also uses. | |
| 901 // This could potentially lead to deadlocks | |
| 902 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 903 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 904 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 905 // since it is used to transfer control between JavaThreads and the VMThread | |
| 14309 | 906 // Do not *exclude* any locks unless you are absolutely sure it is correct. Ask someone else first! |
| 0 | 907 if ( (cur->allow_vm_block() && |
| 908 cur != Threads_lock && | |
| 14309 | 909 cur != Compile_lock && // Temporary: should not be necessary when we get separate compilation |
| 0 | 910 cur != VMOperationRequest_lock && |
| 911 cur != VMOperationQueue_lock) || | |
| 912 cur->rank() == Mutex::special) { | |
| 913 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 914 } | |
| 915 } | |
| 916 } | |
| 917 | |
| 918 if (GCALotAtAllSafepoints) { | |
| 919 // We could enter a safepoint here and thus have a gc | |
| 920 InterfaceSupport::check_gc_alot(); | |
| 921 } | |
| 922 #endif | |
| 923 } | |
| 924 #endif | |
| 925 | |
| 926 bool Thread::is_in_stack(address adr) const { | |
| 927 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 928 address end = os::current_stack_pointer(); | |
|
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929 // Allow non Java threads to call this without stack_base |
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930 if (_stack_base == NULL) return true; |
| 0 | 931 if (stack_base() >= adr && adr >= end) return true; |
| 932 | |
| 933 return false; | |
| 934 } | |
| 935 | |
| 936 | |
|
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937 bool Thread::is_in_usable_stack(address adr) const { |
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938 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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939 size_t usable_stack_size = _stack_size - stack_guard_size; |
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940 |
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941 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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942 } |
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943 |
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944 |
| 0 | 945 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
| 946 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 947 // used for compilation in the future. If that change is made, the need for these methods | |
| 948 // should be revisited, and they should be removed if possible. | |
| 949 | |
| 950 bool Thread::is_lock_owned(address adr) const { | |
|
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951 return on_local_stack(adr); |
| 0 | 952 } |
| 953 | |
| 954 bool Thread::set_as_starting_thread() { | |
| 955 // NOTE: this must be called inside the main thread. | |
| 956 return os::create_main_thread((JavaThread*)this); | |
| 957 } | |
| 958 | |
|
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959 static void initialize_class(Symbol* class_name, TRAPS) { |
|
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960 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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961 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 962 } |
| 963 | |
| 964 | |
| 965 // Creates the initial ThreadGroup | |
| 966 static Handle create_initial_thread_group(TRAPS) { | |
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967 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 968 instanceKlassHandle klass (THREAD, k); |
| 969 | |
| 970 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 971 { | |
| 972 JavaValue result(T_VOID); | |
| 973 JavaCalls::call_special(&result, | |
| 974 system_instance, | |
| 975 klass, | |
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976 vmSymbols::object_initializer_name(), |
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977 vmSymbols::void_method_signature(), |
| 0 | 978 CHECK_NH); |
| 979 } | |
| 980 Universe::set_system_thread_group(system_instance()); | |
| 981 | |
| 982 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 983 { | |
| 984 JavaValue result(T_VOID); | |
| 985 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 986 JavaCalls::call_special(&result, | |
| 987 main_instance, | |
| 988 klass, | |
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989 vmSymbols::object_initializer_name(), |
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990 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 991 system_instance, |
| 992 string, | |
| 993 CHECK_NH); | |
| 994 } | |
| 995 return main_instance; | |
| 996 } | |
| 997 | |
| 998 // Creates the initial Thread | |
| 999 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
|
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1000 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1001 instanceKlassHandle klass (THREAD, k); |
| 1002 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1003 | |
| 1004 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1005 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1006 thread->set_threadObj(thread_oop()); | |
| 1007 | |
| 1008 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1009 | |
| 1010 JavaValue result(T_VOID); | |
| 1011 JavaCalls::call_special(&result, thread_oop, | |
| 1012 klass, | |
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1013 vmSymbols::object_initializer_name(), |
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1014 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1015 thread_group, |
| 1016 string, | |
| 1017 CHECK_NULL); | |
| 1018 return thread_oop(); | |
| 1019 } | |
| 1020 | |
| 1021 static void call_initializeSystemClass(TRAPS) { | |
|
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1022 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1023 instanceKlassHandle klass (THREAD, k); |
| 1024 | |
| 1025 JavaValue result(T_VOID); | |
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1026 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1027 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1028 } |
| 1029 | |
| 6181 | 1030 char java_runtime_name[128] = ""; |
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1031 char java_runtime_version[128] = ""; |
| 6181 | 1032 |
| 1033 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1034 static const char* get_java_runtime_name(TRAPS) { | |
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1035 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1036 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1037 fieldDescriptor fd; | |
| 1038 bool found = k != NULL && | |
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1039 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1040 vmSymbols::string_signature(), &fd); |
| 1041 if (found) { | |
| 1042 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1043 if (name_oop == NULL) | |
| 1044 return NULL; | |
| 1045 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1046 java_runtime_name, | |
| 1047 sizeof(java_runtime_name)); | |
| 1048 return name; | |
| 1049 } else { | |
| 1050 return NULL; | |
| 1051 } | |
| 1052 } | |
| 1053 | |
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1054 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1055 static const char* get_java_runtime_version(TRAPS) { |
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1056 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1057 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1058 fieldDescriptor fd; |
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1059 bool found = k != NULL && |
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1060 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1061 vmSymbols::string_signature(), &fd); |
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1062 if (found) { |
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1063 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1064 if (name_oop == NULL) |
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1065 return NULL; |
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1066 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1067 java_runtime_version, |
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1068 sizeof(java_runtime_version)); |
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1069 return name; |
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1070 } else { |
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1071 return NULL; |
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1072 } |
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1073 } |
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1074 |
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1075 // General purpose hook into Java code, run once when the VM is initialized. |
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1076 // The Java library method itself may be changed independently from the VM. |
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1077 static void call_postVMInitHook(TRAPS) { |
|
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1078 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD); |
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1079 instanceKlassHandle klass (THREAD, k); |
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1080 if (klass.not_null()) { |
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1081 JavaValue result(T_VOID); |
|
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1082 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1083 vmSymbols::void_method_signature(), |
|
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1084 CHECK); |
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1085 } |
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1086 } |
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1087 |
| 0 | 1088 static void reset_vm_info_property(TRAPS) { |
| 1089 // the vm info string | |
| 1090 ResourceMark rm(THREAD); | |
| 1091 const char *vm_info = VM_Version::vm_info_string(); | |
| 1092 | |
| 1093 // java.lang.System class | |
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1094 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1095 instanceKlassHandle klass (THREAD, k); |
| 1096 | |
| 1097 // setProperty arguments | |
| 1098 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1099 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1100 | |
| 1101 // return value | |
| 1102 JavaValue r(T_OBJECT); | |
| 1103 | |
| 1104 // public static String setProperty(String key, String value); | |
| 1105 JavaCalls::call_static(&r, | |
| 1106 klass, | |
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1107 vmSymbols::setProperty_name(), |
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1108 vmSymbols::string_string_string_signature(), |
| 0 | 1109 key_str, |
| 1110 value_str, | |
| 1111 CHECK); | |
| 1112 } | |
| 1113 | |
| 1114 | |
| 1115 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1116 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1117 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1118 | |
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1119 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1120 instanceKlassHandle klass (THREAD, k); |
| 1121 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1122 | |
| 1123 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1124 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1125 set_threadObj(thread_oop()); | |
| 1126 | |
| 1127 JavaValue result(T_VOID); | |
| 1128 if (thread_name != NULL) { | |
| 1129 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1130 // Thread gets assigned specified name and null target | |
| 1131 JavaCalls::call_special(&result, | |
| 1132 thread_oop, | |
| 1133 klass, | |
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1134 vmSymbols::object_initializer_name(), |
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1135 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1136 thread_group, // Argument 1 |
| 1137 name, // Argument 2 | |
| 1138 THREAD); | |
| 1139 } else { | |
| 1140 // Thread gets assigned name "Thread-nnn" and null target | |
| 1141 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1142 JavaCalls::call_special(&result, | |
| 1143 thread_oop, | |
| 1144 klass, | |
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1145 vmSymbols::object_initializer_name(), |
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1146 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1147 thread_group, // Argument 1 |
| 1148 Handle(), // Argument 2 | |
| 1149 THREAD); | |
| 1150 } | |
| 1151 | |
| 1152 | |
| 1153 if (daemon) { | |
| 1154 java_lang_Thread::set_daemon(thread_oop()); | |
| 1155 } | |
| 1156 | |
| 1157 if (HAS_PENDING_EXCEPTION) { | |
| 1158 return; | |
| 1159 } | |
| 1160 | |
| 1142 | 1161 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1162 Handle threadObj(this, this->threadObj()); |
| 1163 | |
| 1164 JavaCalls::call_special(&result, | |
| 1165 thread_group, | |
| 1166 group, | |
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1167 vmSymbols::add_method_name(), |
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1168 vmSymbols::thread_void_signature(), |
| 0 | 1169 threadObj, // Arg 1 |
| 1170 THREAD); | |
| 1171 | |
| 1172 | |
| 1173 } | |
| 1174 | |
| 1175 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1176 // uniquely named instances should derive from this. | |
| 1177 NamedThread::NamedThread() : Thread() { | |
| 1178 _name = NULL; | |
|
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1179 _processed_thread = NULL; |
| 0 | 1180 } |
| 1181 | |
| 1182 NamedThread::~NamedThread() { | |
| 1183 if (_name != NULL) { | |
| 6197 | 1184 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1185 _name = NULL; |
| 1186 } | |
| 1187 } | |
| 1188 | |
| 1189 void NamedThread::set_name(const char* format, ...) { | |
| 1190 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1191 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1192 guarantee(_name != NULL, "alloc failure"); |
| 1193 va_list ap; | |
| 1194 va_start(ap, format); | |
| 1195 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1196 va_end(ap); | |
| 1197 } | |
| 1198 | |
| 1199 // ======= WatcherThread ======== | |
| 1200 | |
| 1201 // The watcher thread exists to simulate timer interrupts. It should | |
| 1202 // be replaced by an abstraction over whatever native support for | |
| 1203 // timer interrupts exists on the platform. | |
| 1204 | |
| 1205 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1206 bool WatcherThread::_startable = false; |
|
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1207 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1208 |
| 11151 | 1209 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
| 0 | 1210 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
| 1211 if (os::create_thread(this, os::watcher_thread)) { | |
| 1212 _watcher_thread = this; | |
| 1213 | |
| 1214 // Set the watcher thread to the highest OS priority which should not be | |
| 1215 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1216 // is created. The only normal thread using this priority is the reference | |
| 1217 // handler thread, which runs for very short intervals only. | |
| 1218 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1219 // will be inaccurate. | |
| 1220 os::set_priority(this, MaxPriority); | |
| 1221 if (!DisableStartThread) { | |
| 1222 os::start_thread(this); | |
| 1223 } | |
| 1224 } | |
| 1225 } | |
| 1226 | |
|
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1227 int WatcherThread::sleep() const { |
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1228 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1229 |
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1230 // remaining will be zero if there are no tasks, |
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1231 // causing the WatcherThread to sleep until a task is |
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1232 // enrolled |
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1233 int remaining = PeriodicTask::time_to_wait(); |
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1234 int time_slept = 0; |
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1235 |
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1236 // we expect this to timeout - we only ever get unparked when |
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1237 // we should terminate or when a new task has been enrolled |
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1238 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1239 |
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1240 jlong time_before_loop = os::javaTimeNanos(); |
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1241 |
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1242 for (;;) { |
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1243 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1244 jlong now = os::javaTimeNanos(); |
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1245 |
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1246 if (remaining == 0) { |
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1247 // if we didn't have any tasks we could have waited for a long time |
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1248 // consider the time_slept zero and reset time_before_loop |
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1249 time_slept = 0; |
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1250 time_before_loop = now; |
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1251 } else { |
| 14309 | 1252 // need to recalculate since we might have new tasks in _tasks |
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1253 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1254 } |
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1255 |
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1256 // Change to task list or spurious wakeup of some kind |
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1257 if (timedout || _should_terminate) { |
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1258 break; |
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1259 } |
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1260 |
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1261 remaining = PeriodicTask::time_to_wait(); |
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1262 if (remaining == 0) { |
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1263 // Last task was just disenrolled so loop around and wait until |
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1264 // another task gets enrolled |
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1265 continue; |
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1266 } |
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1267 |
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1268 remaining -= time_slept; |
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1269 if (remaining <= 0) |
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1270 break; |
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1271 } |
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1272 |
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1273 return time_slept; |
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1274 } |
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1275 |
| 0 | 1276 void WatcherThread::run() { |
| 1277 assert(this == watcher_thread(), "just checking"); | |
| 1278 | |
| 1279 this->record_stack_base_and_size(); | |
| 1280 this->initialize_thread_local_storage(); | |
| 1281 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1282 while(!_should_terminate) { | |
| 1283 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1284 assert(watcher_thread() == this, "thread consistency check"); | |
| 1285 | |
| 1286 // Calculate how long it'll be until the next PeriodicTask work | |
| 1287 // should be done, and sleep that amount of time. | |
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1288 int time_waited = sleep(); |
| 0 | 1289 |
| 1290 if (is_error_reported()) { | |
| 1291 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1292 // should abort JVM after creating an error log file. However in some | |
| 1293 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1294 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1295 // | |
| 1296 // This code is in WatcherThread because WatcherThread wakes up | |
| 1297 // periodically so the fatal error handler doesn't need to do anything; | |
| 1298 // also because the WatcherThread is less likely to crash than other | |
| 1299 // threads. | |
| 1300 | |
| 1301 for (;;) { | |
| 1302 if (!ShowMessageBoxOnError | |
| 1303 && (OnError == NULL || OnError[0] == '\0') | |
| 1304 && Arguments::abort_hook() == NULL) { | |
| 1305 os::sleep(this, 2 * 60 * 1000, false); | |
| 1306 fdStream err(defaultStream::output_fd()); | |
| 1307 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1308 // skip atexit/vm_exit/vm_abort hooks | |
| 1309 os::die(); | |
| 1310 } | |
| 1311 | |
| 1312 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1313 // ShowMessageBoxOnError when it is ready to abort. | |
| 1314 os::sleep(this, 5 * 1000, false); | |
| 1315 } | |
| 1316 } | |
| 1317 | |
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1318 PeriodicTask::real_time_tick(time_waited); |
| 0 | 1319 } |
| 1320 | |
| 1321 // Signal that it is terminated | |
| 1322 { | |
| 1323 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1324 _watcher_thread = NULL; | |
| 1325 Terminator_lock->notify(); | |
| 1326 } | |
| 1327 | |
| 1328 // Thread destructor usually does this.. | |
| 1329 ThreadLocalStorage::set_thread(NULL); | |
| 1330 } | |
| 1331 | |
| 1332 void WatcherThread::start() { | |
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1333 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1334 |
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1335 if (watcher_thread() == NULL && _startable) { |
| 0 | 1336 _should_terminate = false; |
| 1337 // Create the single instance of WatcherThread | |
| 1338 new WatcherThread(); | |
| 1339 } | |
| 1340 } | |
| 1341 | |
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1342 void WatcherThread::make_startable() { |
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1343 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1344 _startable = true; |
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1345 } |
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1346 |
| 0 | 1347 void WatcherThread::stop() { |
|
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1348 { |
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1349 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1350 _should_terminate = true; |
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1351 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1352 |
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1353 WatcherThread* watcher = watcher_thread(); |
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1354 if (watcher != NULL) |
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1355 watcher->unpark(); |
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1356 } |
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1357 |
| 0 | 1358 // it is ok to take late safepoints here, if needed |
| 1359 MutexLocker mu(Terminator_lock); | |
|
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1360 |
| 0 | 1361 while(watcher_thread() != NULL) { |
| 1362 // This wait should make safepoint checks, wait without a timeout, | |
| 1363 // and wait as a suspend-equivalent condition. | |
| 1364 // | |
| 1365 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1366 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1367 // FlatProfiler task, is waiting for the external suspend request on | |
| 1368 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1369 // eventually timeout, but that takes time. Making this wait a | |
| 1370 // suspend-equivalent condition solves that timeout problem. | |
| 1371 // | |
| 1372 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1373 Mutex::_as_suspend_equivalent_flag); | |
| 1374 } | |
| 1375 } | |
| 1376 | |
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1377 void WatcherThread::unpark() { |
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1378 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1379 PeriodicTask_lock->notify(); |
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1380 } |
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1381 |
| 0 | 1382 void WatcherThread::print_on(outputStream* st) const { |
| 1383 st->print("\"%s\" ", name()); | |
| 1384 Thread::print_on(st); | |
| 1385 st->cr(); | |
| 1386 } | |
| 1387 | |
| 1388 // ======= JavaThread ======== | |
| 1389 | |
| 1390 // A JavaThread is a normal Java thread | |
| 1391 | |
| 1392 void JavaThread::initialize() { | |
| 1393 // Initialize fields | |
|
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1394 |
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1395 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1396 set_claimed_par_id(-1); |
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1397 |
| 0 | 1398 set_saved_exception_pc(NULL); |
| 1399 set_threadObj(NULL); | |
| 1400 _anchor.clear(); | |
| 1401 set_entry_point(NULL); | |
| 1402 set_jni_functions(jni_functions()); | |
| 1403 set_callee_target(NULL); | |
| 1404 set_vm_result(NULL); | |
| 1405 set_vm_result_2(NULL); | |
| 1406 set_vframe_array_head(NULL); | |
| 1407 set_vframe_array_last(NULL); | |
| 1408 set_deferred_locals(NULL); | |
| 1409 set_deopt_mark(NULL); | |
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1410 set_deopt_nmethod(NULL); |
| 0 | 1411 clear_must_deopt_id(); |
| 1412 set_monitor_chunks(NULL); | |
| 1413 set_next(NULL); | |
| 1414 set_thread_state(_thread_new); | |
|
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1415 #if INCLUDE_NMT |
| 6197 | 1416 set_recorder(NULL); |
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1417 #endif |
| 0 | 1418 _terminated = _not_terminated; |
| 1419 _privileged_stack_top = NULL; | |
| 1420 _array_for_gc = NULL; | |
| 1421 _suspend_equivalent = false; | |
| 1422 _in_deopt_handler = 0; | |
| 1423 _doing_unsafe_access = false; | |
| 1424 _stack_guard_state = stack_guard_unused; | |
|
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1425 (void)const_cast<oop&>(_exception_oop = NULL); |
| 0 | 1426 _exception_pc = 0; |
| 1427 _exception_handler_pc = 0; | |
| 1903 | 1428 _is_method_handle_return = 0; |
| 0 | 1429 _jvmti_thread_state= NULL; |
|
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1430 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1431 _jvmti_get_loaded_classes_closure = NULL; |
| 1432 _interp_only_mode = 0; | |
| 1433 _special_runtime_exit_condition = _no_async_condition; | |
| 1434 _pending_async_exception = NULL; | |
| 1435 _thread_stat = NULL; | |
| 1436 _thread_stat = new ThreadStatistics(); | |
| 1437 _blocked_on_compilation = false; | |
| 1438 _jni_active_critical = 0; | |
| 1439 _do_not_unlock_if_synchronized = false; | |
| 1440 _cached_monitor_info = NULL; | |
| 1441 _parker = Parker::Allocate(this) ; | |
| 1442 | |
| 1443 #ifndef PRODUCT | |
| 1444 _jmp_ring_index = 0; | |
| 1445 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1446 record_jump(NULL, NULL, NULL, 0); | |
| 1447 } | |
| 1448 #endif /* PRODUCT */ | |
| 1449 | |
| 1450 set_thread_profiler(NULL); | |
| 1451 if (FlatProfiler::is_active()) { | |
| 1452 // This is where we would decide to either give each thread it's own profiler | |
| 1453 // or use one global one from FlatProfiler, | |
| 1454 // or up to some count of the number of profiled threads, etc. | |
| 1455 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1456 pp->engage(); | |
| 1457 set_thread_profiler(pp); | |
| 1458 } | |
| 1459 | |
| 1460 // Setup safepoint state info for this thread | |
| 1461 ThreadSafepointState::create(this); | |
| 1462 | |
| 1463 debug_only(_java_call_counter = 0); | |
| 1464 | |
| 1465 // JVMTI PopFrame support | |
| 1466 _popframe_condition = popframe_inactive; | |
| 1467 _popframe_preserved_args = NULL; | |
| 1468 _popframe_preserved_args_size = 0; | |
| 1469 | |
| 1470 pd_initialize(); | |
| 1471 } | |
| 1472 | |
|
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1473 #if INCLUDE_ALL_GCS |
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1474 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1475 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1476 #endif // INCLUDE_ALL_GCS |
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1477 |
| 4006 | 1478 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1479 Thread() |
|
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1480 #if INCLUDE_ALL_GCS |
|
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1481 , _satb_mark_queue(&_satb_mark_queue_set), |
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1482 _dirty_card_queue(&_dirty_card_queue_set) |
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1483 #endif // INCLUDE_ALL_GCS |
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1484 { |
| 0 | 1485 initialize(); |
| 4006 | 1486 if (is_attaching_via_jni) { |
| 1487 _jni_attach_state = _attaching_via_jni; | |
| 1488 } else { | |
| 1489 _jni_attach_state = _not_attaching_via_jni; | |
| 1490 } | |
|
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1491 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
| 6197 | 1492 _safepoint_visible = false; |
| 0 | 1493 } |
| 1494 | |
| 1495 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1496 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1497 return true; // Stack already guarded or guard pages not needed. | |
| 1498 } | |
| 1499 | |
| 1500 if (register_stack_overflow()) { | |
| 1501 // For those architectures which have separate register and | |
| 1502 // memory stacks, we must check the register stack to see if | |
| 1503 // it has overflowed. | |
| 1504 return false; | |
| 1505 } | |
| 1506 | |
| 1507 // Java code never executes within the yellow zone: the latter is only | |
| 1508 // there to provoke an exception during stack banging. If java code | |
| 1509 // is executing there, either StackShadowPages should be larger, or | |
| 1510 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1511 // when it should. | |
| 1512 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1513 | |
| 1514 enable_stack_yellow_zone(); | |
| 1515 return true; | |
| 1516 } | |
| 1517 | |
| 1518 bool JavaThread::reguard_stack(void) { | |
| 1519 return reguard_stack(os::current_stack_pointer()); | |
| 1520 } | |
| 1521 | |
| 1522 | |
| 1523 void JavaThread::block_if_vm_exited() { | |
| 1524 if (_terminated == _vm_exited) { | |
| 1525 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1526 // we will block here forever | |
| 1527 Threads_lock->lock_without_safepoint_check(); | |
| 1528 ShouldNotReachHere(); | |
| 1529 } | |
| 1530 } | |
| 1531 | |
| 1532 | |
| 1533 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1534 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1535 | |
|
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1536 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1537 Thread() |
|
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1538 #if INCLUDE_ALL_GCS |
|
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1539 , _satb_mark_queue(&_satb_mark_queue_set), |
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1540 _dirty_card_queue(&_dirty_card_queue_set) |
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1541 #endif // INCLUDE_ALL_GCS |
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1542 { |
| 0 | 1543 if (TraceThreadEvents) { |
| 1544 tty->print_cr("creating thread %p", this); | |
| 1545 } | |
| 1546 initialize(); | |
| 4006 | 1547 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1548 set_entry_point(entry_point); |
| 1549 // Create the native thread itself. | |
| 1550 // %note runtime_23 | |
| 1551 os::ThreadType thr_type = os::java_thread; | |
| 1552 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1553 os::java_thread; | |
| 1554 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1555 _safepoint_visible = false; |
| 0 | 1556 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1557 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1558 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1559 // the exception consists of creating the exception object & initializing it, initialization | |
| 1560 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1561 // | |
| 1562 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1563 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1564 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1565 // object must be fully initialized (take a look at JVM_Start) | |
| 1566 } | |
| 1567 | |
| 1568 JavaThread::~JavaThread() { | |
| 1569 if (TraceThreadEvents) { | |
| 1570 tty->print_cr("terminate thread %p", this); | |
| 1571 } | |
| 1572 | |
|
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1573 // By now, this thread should already be invisible to safepoint, |
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1574 // and its per-thread recorder also collected. |
| 6197 | 1575 assert(!is_safepoint_visible(), "wrong state"); |
|
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1576 #if INCLUDE_NMT |
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1577 assert(get_recorder() == NULL, "Already collected"); |
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1578 #endif // INCLUDE_NMT |
| 6197 | 1579 |
| 0 | 1580 // JSR166 -- return the parker to the free list |
| 1581 Parker::Release(_parker); | |
| 1582 _parker = NULL ; | |
| 1583 | |
| 1584 // Free any remaining previous UnrollBlock | |
| 1585 vframeArray* old_array = vframe_array_last(); | |
| 1586 | |
| 1587 if (old_array != NULL) { | |
| 1588 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1589 old_array->set_unroll_block(NULL); | |
| 1590 delete old_info; | |
| 1591 delete old_array; | |
| 1592 } | |
| 1593 | |
| 1594 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1595 if (deferred != NULL) { | |
| 1596 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1597 assert(deferred->length() != 0, "empty array!"); | |
| 1598 do { | |
| 1599 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1600 deferred->remove_at(0); | |
| 1601 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1602 delete dlv; | |
| 1603 } while (deferred->length() != 0); | |
| 1604 delete deferred; | |
| 1605 } | |
| 1606 | |
| 1607 // All Java related clean up happens in exit | |
| 1608 ThreadSafepointState::destroy(this); | |
| 1609 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1610 if (_thread_stat != NULL) delete _thread_stat; | |
| 1611 } | |
| 1612 | |
| 1613 | |
| 1614 // The first routine called by a new Java thread | |
| 1615 void JavaThread::run() { | |
| 1616 // initialize thread-local alloc buffer related fields | |
| 1617 this->initialize_tlab(); | |
| 1618 | |
| 14309 | 1619 // used to test validity of stack trace backs |
| 0 | 1620 this->record_base_of_stack_pointer(); |
| 1621 | |
| 1622 // Record real stack base and size. | |
| 1623 this->record_stack_base_and_size(); | |
| 1624 | |
| 1625 // Initialize thread local storage; set before calling MutexLocker | |
| 1626 this->initialize_thread_local_storage(); | |
| 1627 | |
| 1628 this->create_stack_guard_pages(); | |
| 1629 | |
|
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1630 this->cache_global_variables(); |
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1631 |
| 0 | 1632 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1633 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1634 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1635 | |
| 1636 assert(JavaThread::current() == this, "sanity check"); | |
| 1637 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1638 | |
| 1639 DTRACE_THREAD_PROBE(start, this); | |
| 1640 | |
| 1641 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1642 // been completed. | |
| 1643 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1644 | |
| 1645 if (JvmtiExport::should_post_thread_life()) { | |
| 1646 JvmtiExport::post_thread_start(this); | |
| 1647 } | |
| 1648 | |
| 10405 | 1649 EventThreadStart event; |
| 1650 if (event.should_commit()) { | |
| 1651 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1652 event.commit(); | |
| 1653 } | |
|
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1654 |
| 0 | 1655 // We call another function to do the rest so we are sure that the stack addresses used |
| 1656 // from there will be lower than the stack base just computed | |
| 1657 thread_main_inner(); | |
| 1658 | |
| 1659 // Note, thread is no longer valid at this point! | |
| 1660 } | |
| 1661 | |
| 1662 | |
| 1663 void JavaThread::thread_main_inner() { | |
| 1664 assert(JavaThread::current() == this, "sanity check"); | |
| 1665 assert(this->threadObj() != NULL, "just checking"); | |
| 1666 | |
|
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1667 // Execute thread entry point unless this thread has a pending exception |
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1668 // or has been stopped before starting. |
| 0 | 1669 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1670 if (!this->has_pending_exception() && |
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1671 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1672 { |
| 1673 ResourceMark rm(this); | |
| 1674 this->set_native_thread_name(this->get_thread_name()); | |
| 1675 } | |
| 0 | 1676 HandleMark hm(this); |
| 1677 this->entry_point()(this, this); | |
| 1678 } | |
| 1679 | |
| 1680 DTRACE_THREAD_PROBE(stop, this); | |
| 1681 | |
| 1682 this->exit(false); | |
| 1683 delete this; | |
| 1684 } | |
| 1685 | |
| 1686 | |
| 1687 static void ensure_join(JavaThread* thread) { | |
| 1688 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1689 Handle threadObj(thread, thread->threadObj()); | |
| 1690 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1691 ObjectLocker lock(threadObj, thread); | |
| 1692 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1693 thread->clear_pending_exception(); | |
| 1694 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1695 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1696 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1697 // to complete once we've done the notify_all below |
| 0 | 1698 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1699 lock.notify_all(thread); | |
| 1700 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1701 thread->clear_pending_exception(); | |
| 1702 } | |
| 1703 | |
|
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1704 |
| 0 | 1705 // For any new cleanup additions, please check to see if they need to be applied to |
| 1706 // cleanup_failed_attach_current_thread as well. | |
| 1707 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1708 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1709 | |
| 1710 HandleMark hm(this); | |
| 1711 Handle uncaught_exception(this, this->pending_exception()); | |
| 1712 this->clear_pending_exception(); | |
| 1713 Handle threadObj(this, this->threadObj()); | |
| 1714 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1715 | |
| 1716 if (get_thread_profiler() != NULL) { | |
| 1717 get_thread_profiler()->disengage(); | |
| 1718 ResourceMark rm; | |
| 1719 get_thread_profiler()->print(get_thread_name()); | |
| 1720 } | |
| 1721 | |
| 1722 | |
| 1723 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1724 { | |
| 1725 EXCEPTION_MARK; | |
| 1726 | |
| 1727 CLEAR_PENDING_EXCEPTION; | |
| 1728 } | |
| 1729 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1730 // has to be fixed by a runtime query method | |
| 1731 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1732 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1733 // java.lang.Thread.dispatchUncaughtException | |
| 1734 if (uncaught_exception.not_null()) { | |
| 1735 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1736 { | |
| 1737 EXCEPTION_MARK; | |
| 1738 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1739 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1740 // so call ThreadGroup.uncaughtException() | |
| 1741 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1742 CallInfo callinfo; | |
| 1142 | 1743 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1744 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1745 vmSymbols::dispatchUncaughtException_name(), |
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1746 vmSymbols::throwable_void_signature(), |
| 0 | 1747 KlassHandle(), false, false, THREAD); |
| 1748 CLEAR_PENDING_EXCEPTION; | |
| 1749 methodHandle method = callinfo.selected_method(); | |
| 1750 if (method.not_null()) { | |
| 1751 JavaValue result(T_VOID); | |
| 1752 JavaCalls::call_virtual(&result, | |
| 1753 threadObj, thread_klass, | |
|
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1754 vmSymbols::dispatchUncaughtException_name(), |
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1755 vmSymbols::throwable_void_signature(), |
| 0 | 1756 uncaught_exception, |
| 1757 THREAD); | |
| 1758 } else { | |
| 1142 | 1759 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1760 JavaValue result(T_VOID); |
| 1761 JavaCalls::call_virtual(&result, | |
| 1762 group, thread_group, | |
|
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1763 vmSymbols::uncaughtException_name(), |
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1764 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1765 threadObj, // Arg 1 |
| 1766 uncaught_exception, // Arg 2 | |
| 1767 THREAD); | |
| 1768 } | |
|
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1769 if (HAS_PENDING_EXCEPTION) { |
|
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1770 ResourceMark rm(this); |
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1771 jio_fprintf(defaultStream::error_stream(), |
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1772 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1773 " in thread \"%s\"\n", |
| 6983 | 1774 pending_exception()->klass()->external_name(), |
|
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1775 get_thread_name()); |
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1776 CLEAR_PENDING_EXCEPTION; |
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1777 } |
| 0 | 1778 } |
| 1779 } | |
| 1780 | |
|
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1781 // Called before the java thread exit since we want to read info |
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1782 // from java_lang_Thread object |
| 10405 | 1783 EventThreadEnd event; |
| 1784 if (event.should_commit()) { | |
| 1785 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1786 event.commit(); | |
| 1787 } | |
|
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1788 |
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1789 // Call after last event on thread |
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|
1790 EVENT_THREAD_EXIT(this); |
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1791 |
| 0 | 1792 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1793 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1794 // is deprecated anyhow. | |
|
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1795 if (!is_Compiler_thread()) { |
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1796 int count = 3; |
| 0 | 1797 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
| 1798 EXCEPTION_MARK; | |
| 1799 JavaValue result(T_VOID); | |
| 1142 | 1800 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1801 JavaCalls::call_virtual(&result, |
| 1802 threadObj, thread_klass, | |
|
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1803 vmSymbols::exit_method_name(), |
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1804 vmSymbols::void_method_signature(), |
| 0 | 1805 THREAD); |
| 1806 CLEAR_PENDING_EXCEPTION; | |
| 1807 } | |
| 1808 } | |
| 1809 // notify JVMTI | |
| 1810 if (JvmtiExport::should_post_thread_life()) { | |
| 1811 JvmtiExport::post_thread_end(this); | |
| 1812 } | |
| 1813 | |
| 1814 // We have notified the agents that we are exiting, before we go on, | |
| 1815 // we must check for a pending external suspend request and honor it | |
| 1816 // in order to not surprise the thread that made the suspend request. | |
| 1817 while (true) { | |
| 1818 { | |
| 1819 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1820 if (!is_external_suspend()) { | |
| 1821 set_terminated(_thread_exiting); | |
| 1822 ThreadService::current_thread_exiting(this); | |
| 1823 break; | |
| 1824 } | |
| 1825 // Implied else: | |
| 1826 // Things get a little tricky here. We have a pending external | |
| 1827 // suspend request, but we are holding the SR_lock so we | |
| 1828 // can't just self-suspend. So we temporarily drop the lock | |
| 1829 // and then self-suspend. | |
| 1830 } | |
| 1831 | |
| 1832 ThreadBlockInVM tbivm(this); | |
| 1833 java_suspend_self(); | |
| 1834 | |
| 1835 // We're done with this suspend request, but we have to loop around | |
| 1836 // and check again. Eventually we will get SR_lock without a pending | |
| 1837 // external suspend request and will be able to mark ourselves as | |
| 1838 // exiting. | |
| 1839 } | |
| 1840 // no more external suspends are allowed at this point | |
| 1841 } else { | |
| 1842 // before_exit() has already posted JVMTI THREAD_END events | |
| 1843 } | |
| 1844 | |
| 1845 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1846 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1847 // group should have the destroyed bit set before waiters are notified). | |
| 1848 ensure_join(this); | |
| 1849 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1850 | |
| 1851 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1852 // held by this thread must be released. A detach operation must only | |
| 1853 // get here if there are no Java frames on the stack. Therefore, any | |
| 1854 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1855 // pre-inflated and in the monitor cache. | |
| 1856 // | |
| 1857 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1858 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1859 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1860 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1861 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1862 } | |
| 1863 | |
| 1864 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1865 // is in a consistent state, in case GC happens | |
| 1866 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1867 | |
| 1868 if (active_handles() != NULL) { | |
| 1869 JNIHandleBlock* block = active_handles(); | |
| 1870 set_active_handles(NULL); | |
| 1871 JNIHandleBlock::release_block(block); | |
| 1872 } | |
| 1873 | |
| 1874 if (free_handle_block() != NULL) { | |
| 1875 JNIHandleBlock* block = free_handle_block(); | |
| 1876 set_free_handle_block(NULL); | |
| 1877 JNIHandleBlock::release_block(block); | |
| 1878 } | |
| 1879 | |
| 1880 // These have to be removed while this is still a valid thread. | |
| 1881 remove_stack_guard_pages(); | |
| 1882 | |
| 1883 if (UseTLAB) { | |
| 1884 tlab().make_parsable(true); // retire TLAB | |
| 1885 } | |
| 1886 | |
|
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1887 if (JvmtiEnv::environments_might_exist()) { |
|
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1888 JvmtiExport::cleanup_thread(this); |
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1889 } |
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1890 |
|
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1891 // We must flush any deferred card marks before removing a thread from |
|
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1892 // the list of active threads. |
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1893 Universe::heap()->flush_deferred_store_barrier(this); |
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1894 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1895 |
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1896 #if INCLUDE_ALL_GCS |
|
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1897 // We must flush the G1-related buffers before removing a thread |
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1898 // from the list of active threads. We must do this after any deferred |
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1899 // card marks have been flushed (above) so that any entries that are |
|
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1900 // added to the thread's dirty card queue as a result are not lost. |
|
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1901 if (UseG1GC) { |
|
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1902 flush_barrier_queues(); |
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1903 } |
|
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1904 #endif // INCLUDE_ALL_GCS |
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1905 |
| 0 | 1906 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1907 Threads::remove(this); | |
| 1908 } | |
| 1909 | |
|
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1910 #if INCLUDE_ALL_GCS |
|
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1911 // Flush G1-related queues. |
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1912 void JavaThread::flush_barrier_queues() { |
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1913 satb_mark_queue().flush(); |
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1914 dirty_card_queue().flush(); |
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1915 } |
|
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1916 |
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1917 void JavaThread::initialize_queues() { |
|
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1918 assert(!SafepointSynchronize::is_at_safepoint(), |
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1919 "we should not be at a safepoint"); |
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1920 |
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1921 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1922 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1923 // The SATB queue should have been constructed with its active |
|
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1924 // field set to false. |
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1925 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1926 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1927 // If we are creating the thread during a marking cycle, we should |
|
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1928 // set the active field of the SATB queue to true. |
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1929 if (satb_queue_set.is_active()) { |
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1930 satb_queue.set_active(true); |
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1931 } |
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1932 |
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1933 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1934 // The dirty card queue should have been constructed with its |
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1935 // active field set to true. |
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1936 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1937 } |
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1938 #endif // INCLUDE_ALL_GCS |
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1939 |
| 0 | 1940 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1941 if (get_thread_profiler() != NULL) { |
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1942 get_thread_profiler()->disengage(); |
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1943 ResourceMark rm; |
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1944 get_thread_profiler()->print(get_thread_name()); |
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1945 } |
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1946 |
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1947 if (active_handles() != NULL) { |
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1948 JNIHandleBlock* block = active_handles(); |
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1949 set_active_handles(NULL); |
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1950 JNIHandleBlock::release_block(block); |
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1951 } |
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1952 |
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1953 if (free_handle_block() != NULL) { |
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1954 JNIHandleBlock* block = free_handle_block(); |
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1955 set_free_handle_block(NULL); |
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1956 JNIHandleBlock::release_block(block); |
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1957 } |
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1958 |
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1959 // These have to be removed while this is still a valid thread. |
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1960 remove_stack_guard_pages(); |
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1961 |
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1962 if (UseTLAB) { |
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1963 tlab().make_parsable(true); // retire TLAB, if any |
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1964 } |
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1965 |
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1966 #if INCLUDE_ALL_GCS |
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1967 if (UseG1GC) { |
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1968 flush_barrier_queues(); |
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1969 } |
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1970 #endif // INCLUDE_ALL_GCS |
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1971 |
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1972 Threads::remove(this); |
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1973 delete this; |
| 0 | 1974 } |
| 1975 | |
| 1976 | |
|
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1977 |
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1978 |
| 0 | 1979 JavaThread* JavaThread::active() { |
| 1980 Thread* thread = ThreadLocalStorage::thread(); | |
| 1981 assert(thread != NULL, "just checking"); | |
| 1982 if (thread->is_Java_thread()) { | |
| 1983 return (JavaThread*) thread; | |
| 1984 } else { | |
| 1985 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1986 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1987 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1988 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1989 return ret; | |
| 1990 } | |
| 1991 } | |
| 1992 | |
| 1993 bool JavaThread::is_lock_owned(address adr) const { | |
|
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1994 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1995 |
| 1996 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1997 if (chunk->contains(adr)) return true; | |
| 1998 } | |
| 1999 | |
| 2000 return false; | |
| 2001 } | |
| 2002 | |
| 2003 | |
| 2004 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 2005 chunk->set_next(monitor_chunks()); | |
| 2006 set_monitor_chunks(chunk); | |
| 2007 } | |
| 2008 | |
| 2009 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 2010 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 2011 if (monitor_chunks() == chunk) { | |
| 2012 set_monitor_chunks(chunk->next()); | |
| 2013 } else { | |
| 2014 MonitorChunk* prev = monitor_chunks(); | |
| 2015 while (prev->next() != chunk) prev = prev->next(); | |
| 2016 prev->set_next(chunk->next()); | |
| 2017 } | |
| 2018 } | |
| 2019 | |
| 2020 // JVM support. | |
| 2021 | |
| 2022 // Note: this function shouldn't block if it's called in | |
| 2023 // _thread_in_native_trans state (such as from | |
| 2024 // check_special_condition_for_native_trans()). | |
| 2025 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 2026 | |
| 2027 if (has_last_Java_frame() && has_async_condition()) { | |
| 2028 // If we are at a polling page safepoint (not a poll return) | |
| 2029 // then we must defer async exception because live registers | |
| 2030 // will be clobbered by the exception path. Poll return is | |
| 2031 // ok because the call we a returning from already collides | |
| 2032 // with exception handling registers and so there is no issue. | |
| 2033 // (The exception handling path kills call result registers but | |
| 2034 // this is ok since the exception kills the result anyway). | |
| 2035 | |
| 2036 if (is_at_poll_safepoint()) { | |
| 2037 // if the code we are returning to has deoptimized we must defer | |
| 2038 // the exception otherwise live registers get clobbered on the | |
| 2039 // exception path before deoptimization is able to retrieve them. | |
| 2040 // | |
| 2041 RegisterMap map(this, false); | |
| 2042 frame caller_fr = last_frame().sender(&map); | |
| 2043 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 2044 if (caller_fr.is_deoptimized_frame()) { | |
| 2045 if (TraceExceptions) { | |
| 2046 ResourceMark rm; | |
| 2047 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 2048 } | |
| 2049 return; | |
| 2050 } | |
| 2051 } | |
| 2052 } | |
| 2053 | |
| 2054 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 2055 if (condition == _no_async_condition) { | |
| 2056 // Conditions have changed since has_special_runtime_exit_condition() | |
| 2057 // was called: | |
| 2058 // - if we were here only because of an external suspend request, | |
| 2059 // then that was taken care of above (or cancelled) so we are done | |
| 2060 // - if we were here because of another async request, then it has | |
| 2061 // been cleared between the has_special_runtime_exit_condition() | |
| 2062 // and now so again we are done | |
| 2063 return; | |
| 2064 } | |
| 2065 | |
| 2066 // Check for pending async. exception | |
| 2067 if (_pending_async_exception != NULL) { | |
| 2068 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2069 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2070 |
| 2071 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2072 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2073 | |
| 2074 if (TraceExceptions) { | |
| 2075 ResourceMark rm; | |
| 2076 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2077 if (has_last_Java_frame() ) { | |
| 2078 frame f = last_frame(); | |
| 2079 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2080 } | |
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2081 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2082 } |
| 2083 _pending_async_exception = NULL; | |
| 2084 clear_has_async_exception(); | |
| 2085 } | |
| 2086 } | |
| 2087 | |
| 2088 if (check_unsafe_error && | |
| 2089 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2090 condition = _no_async_condition; // done | |
| 2091 switch (thread_state()) { | |
| 2092 case _thread_in_vm: | |
| 2093 { | |
| 2094 JavaThread* THREAD = this; | |
| 2095 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2096 } | |
| 2097 case _thread_in_native: | |
| 2098 { | |
| 2099 ThreadInVMfromNative tiv(this); | |
| 2100 JavaThread* THREAD = this; | |
| 2101 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2102 } | |
| 2103 case _thread_in_Java: | |
| 2104 { | |
| 2105 ThreadInVMfromJava tiv(this); | |
| 2106 JavaThread* THREAD = this; | |
| 2107 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2108 } | |
| 2109 default: | |
| 2110 ShouldNotReachHere(); | |
| 2111 } | |
| 2112 } | |
| 2113 | |
| 2114 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2115 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2116 "must have handled the async condition, if no exception"); | |
| 2117 } | |
| 2118 | |
| 2119 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2120 // | |
| 2121 // Check for pending external suspend. Internal suspend requests do | |
| 2122 // not use handle_special_runtime_exit_condition(). | |
| 2123 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2124 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2125 // threads could call into the VM with another thread's JNIEnv so we | |
| 2126 // can be here operating on behalf of a suspended thread (4432884). | |
| 2127 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2128 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2129 // | |
| 2130 // Because thread is external suspended the safepoint code will count | |
| 2131 // thread as at a safepoint. This can be odd because we can be here | |
| 2132 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2133 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2134 // before calling java_suspend_self like all other callers of it but | |
| 2135 // we must then observe proper safepoint protocol. (We can't leave | |
| 2136 // _thread_blocked with a safepoint in progress). However we can be | |
| 2137 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2138 // constructor/destructor pair because they assert on that type of | |
| 2139 // transition. We could do something like: | |
| 2140 // | |
| 2141 // JavaThreadState state = thread_state(); | |
| 2142 // set_thread_state(_thread_in_vm); | |
| 2143 // { | |
| 2144 // ThreadBlockInVM tbivm(this); | |
| 2145 // java_suspend_self() | |
| 2146 // } | |
| 2147 // set_thread_state(_thread_in_vm_trans); | |
| 2148 // if (safepoint) block; | |
| 2149 // set_thread_state(state); | |
| 2150 // | |
| 2151 // but that is pretty messy. Instead we just go with the way the | |
| 2152 // code has worked before and note that this is the only path to | |
| 2153 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2154 // mode. | |
| 2155 | |
| 2156 frame_anchor()->make_walkable(this); | |
| 2157 java_suspend_self(); | |
| 2158 | |
| 2159 // We might be here for reasons in addition to the self-suspend request | |
| 2160 // so check for other async requests. | |
| 2161 } | |
| 2162 | |
| 2163 if (check_asyncs) { | |
| 2164 check_and_handle_async_exceptions(); | |
| 2165 } | |
| 2166 } | |
| 2167 | |
| 2168 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2169 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2170 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2171 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2172 | |
| 2173 // Do not throw asynchronous exceptions against the compiler thread | |
| 2174 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2175 if (is_Compiler_thread()) return; | |
| 2176 | |
| 2177 { | |
| 2178 // Actually throw the Throwable against the target Thread - however | |
| 2179 // only if there is no thread death exception installed already. | |
| 1142 | 2180 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2181 // If the topmost frame is a runtime stub, then we are calling into |
| 2182 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2183 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2184 // may not be valid | |
| 2185 if (has_last_Java_frame()) { | |
| 2186 frame f = last_frame(); | |
| 2187 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2188 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2189 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2190 frame compiled_frame = f.sender(®_map); | |
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2191 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
| 0 | 2192 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
| 2193 } | |
| 2194 } | |
| 2195 } | |
| 2196 | |
| 2197 // Set async. pending exception in thread. | |
| 2198 set_pending_async_exception(java_throwable); | |
| 2199 | |
| 2200 if (TraceExceptions) { | |
| 2201 ResourceMark rm; | |
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2202 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2203 } |
| 2204 // for AbortVMOnException flag | |
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2205 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2206 } |
| 2207 } | |
| 2208 | |
| 2209 | |
| 2210 // Interrupt thread so it will wake up from a potential wait() | |
| 2211 Thread::interrupt(this); | |
| 2212 } | |
| 2213 | |
| 2214 // External suspension mechanism. | |
| 2215 // | |
| 2216 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2217 // to any VM_locks and it is at a transition | |
| 2218 // Self-suspension will happen on the transition out of the vm. | |
| 2219 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2220 // | |
| 2221 // Guarantees on return: | |
| 2222 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2223 // force a safepoint) | |
| 2224 // + Target thread will not enter any new monitors | |
| 2225 // | |
| 2226 void JavaThread::java_suspend() { | |
| 2227 { MutexLocker mu(Threads_lock); | |
| 2228 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2229 return; | |
| 2230 } | |
| 2231 } | |
| 2232 | |
| 2233 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2234 if (!is_external_suspend()) { | |
| 2235 // a racing resume has cancelled us; bail out now | |
| 2236 return; | |
| 2237 } | |
| 2238 | |
| 2239 // suspend is done | |
| 2240 uint32_t debug_bits = 0; | |
| 2241 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2242 // SR_lock to allow the thread to reach a stable thread state if | |
| 2243 // it is currently in a transient thread state. | |
| 2244 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2245 SuspendRetryDelay, &debug_bits) ) { | |
| 2246 return; | |
| 2247 } | |
| 2248 } | |
| 2249 | |
| 2250 VM_ForceSafepoint vm_suspend; | |
| 2251 VMThread::execute(&vm_suspend); | |
| 2252 } | |
| 2253 | |
| 2254 // Part II of external suspension. | |
| 2255 // A JavaThread self suspends when it detects a pending external suspend | |
| 2256 // request. This is usually on transitions. It is also done in places | |
| 2257 // where continuing to the next transition would surprise the caller, | |
| 2258 // e.g., monitor entry. | |
| 2259 // | |
| 2260 // Returns the number of times that the thread self-suspended. | |
| 2261 // | |
| 2262 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2263 // thread. java_suspend_self() is the second stage of cooperative | |
| 2264 // suspension for external suspend requests and should only be used | |
| 2265 // to complete an external suspend request. | |
| 2266 // | |
| 2267 int JavaThread::java_suspend_self() { | |
| 2268 int ret = 0; | |
| 2269 | |
| 2270 // we are in the process of exiting so don't suspend | |
| 2271 if (is_exiting()) { | |
| 2272 clear_external_suspend(); | |
| 2273 return ret; | |
| 2274 } | |
| 2275 | |
| 2276 assert(_anchor.walkable() || | |
| 2277 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2278 "must have walkable stack"); | |
| 2279 | |
| 2280 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2281 | |
| 979 | 2282 assert(!this->is_ext_suspended(), |
| 0 | 2283 "a thread trying to self-suspend should not already be suspended"); |
| 2284 | |
| 2285 if (this->is_suspend_equivalent()) { | |
| 2286 // If we are self-suspending as a result of the lifting of a | |
| 2287 // suspend equivalent condition, then the suspend_equivalent | |
| 2288 // flag is not cleared until we set the ext_suspended flag so | |
| 2289 // that wait_for_ext_suspend_completion() returns consistent | |
| 2290 // results. | |
| 2291 this->clear_suspend_equivalent(); | |
| 2292 } | |
| 2293 | |
| 2294 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2295 // above. Or another external suspend request could be waiting for us | |
| 2296 // by the time we return from SR_lock()->wait(). The thread | |
| 2297 // that requested the suspension may already be trying to walk our | |
| 2298 // stack and if we return now, we can change the stack out from under | |
| 2299 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2300 // to crash. We stay self-suspended until there are no more pending | |
| 2301 // external suspend requests. | |
| 2302 while (is_external_suspend()) { | |
| 2303 ret++; | |
| 2304 this->set_ext_suspended(); | |
| 2305 | |
| 2306 // _ext_suspended flag is cleared by java_resume() | |
| 2307 while (is_ext_suspended()) { | |
| 2308 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2309 } | |
| 2310 } | |
| 2311 | |
| 2312 return ret; | |
| 2313 } | |
| 2314 | |
| 2315 #ifdef ASSERT | |
| 2316 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2317 // hence doesn't need protection from concurrent access at this stage | |
| 2318 void JavaThread::verify_not_published() { | |
| 2319 if (!Threads_lock->owned_by_self()) { | |
| 2320 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2321 assert( !Threads::includes(this), | |
| 2322 "java thread shouldn't have been published yet!"); | |
| 2323 } | |
| 2324 else { | |
| 2325 assert( !Threads::includes(this), | |
| 2326 "java thread shouldn't have been published yet!"); | |
| 2327 } | |
| 2328 } | |
| 2329 #endif | |
| 2330 | |
| 2331 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2332 // progress or when _suspend_flags is non-zero. | |
| 2333 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2334 // block if a safepoint is in progress. | |
| 2335 // Async exception ISN'T checked. | |
| 2336 // Note only the ThreadInVMfromNative transition can call this function | |
| 2337 // directly and when thread state is _thread_in_native_trans | |
| 2338 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2339 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2340 | |
| 2341 JavaThread *curJT = JavaThread::current(); | |
| 2342 bool do_self_suspend = thread->is_external_suspend(); | |
| 2343 | |
| 2344 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2345 | |
| 2346 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2347 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2348 // threads could call into the VM with another thread's JNIEnv so we | |
| 2349 // can be here operating on behalf of a suspended thread (4432884). | |
| 2350 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2351 JavaThreadState state = thread->thread_state(); | |
| 2352 | |
| 2353 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2354 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2355 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2356 thread->set_suspend_equivalent(); | |
| 2357 | |
| 2358 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2359 // wait until the thread changes to other thread state. There is no | |
| 2360 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2361 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2362 // too long. Temporarily change the state to _thread_blocked to | |
| 2363 // let the VM thread know that this thread is ready for GC. The problem | |
| 2364 // of changing thread state is that safepoint could happen just after | |
| 2365 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2366 // see the _thread_blocked state. We must check for safepoint | |
| 2367 // after restoring the state and make sure we won't leave while a safepoint | |
| 2368 // is in progress. | |
| 2369 thread->set_thread_state(_thread_blocked); | |
| 2370 thread->java_suspend_self(); | |
| 2371 thread->set_thread_state(state); | |
| 2372 // Make sure new state is seen by VM thread | |
| 2373 if (os::is_MP()) { | |
| 2374 if (UseMembar) { | |
| 2375 // Force a fence between the write above and read below | |
| 2376 OrderAccess::fence(); | |
| 2377 } else { | |
| 2378 // Must use this rather than serialization page in particular on Windows | |
| 2379 InterfaceSupport::serialize_memory(thread); | |
| 2380 } | |
| 2381 } | |
| 2382 } | |
| 2383 | |
| 2384 if (SafepointSynchronize::do_call_back()) { | |
| 2385 // If we are safepointing, then block the caller which may not be | |
| 2386 // the same as the target thread (see above). | |
| 2387 SafepointSynchronize::block(curJT); | |
| 2388 } | |
| 2389 | |
| 2390 if (thread->is_deopt_suspend()) { | |
| 2391 thread->clear_deopt_suspend(); | |
| 2392 RegisterMap map(thread, false); | |
| 2393 frame f = thread->last_frame(); | |
| 2394 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2395 f = f.sender(&map); | |
| 2396 } | |
| 2397 if (f.id() == thread->must_deopt_id()) { | |
| 2398 thread->clear_must_deopt_id(); | |
|
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2399 f.deoptimize(thread); |
| 0 | 2400 } else { |
| 2401 fatal("missed deoptimization!"); | |
| 2402 } | |
| 2403 } | |
| 2404 } | |
| 2405 | |
| 2406 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2407 // progress or when _suspend_flags is non-zero. | |
| 2408 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2409 // block if a safepoint is in progress. | |
| 2410 // Also check for pending async exception (not including unsafe access error). | |
| 2411 // Note only the native==>VM/Java barriers can call this function and when | |
| 2412 // thread state is _thread_in_native_trans. | |
| 2413 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2414 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2415 | |
| 2416 if (thread->has_async_exception()) { | |
| 2417 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2418 // access error since that may block. | |
| 2419 thread->check_and_handle_async_exceptions(false); | |
| 2420 } | |
| 2421 } | |
| 2422 | |
|
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2423 // This is a variant of the normal |
|
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2424 // check_special_condition_for_native_trans with slightly different |
|
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2425 // semantics for use by critical native wrappers. It does all the |
|
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2426 // normal checks but also performs the transition back into |
|
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2427 // thread_in_Java state. This is required so that critical natives |
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2428 // can potentially block and perform a GC if they are the last thread |
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2429 // exiting the GC_locker. |
|
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2430 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
|
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2431 check_special_condition_for_native_trans(thread); |
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2432 |
|
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2433 // Finish the transition |
|
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2434 thread->set_thread_state(_thread_in_Java); |
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2435 |
|
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2436 if (thread->do_critical_native_unlock()) { |
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2437 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2438 GC_locker::unlock_critical(thread); |
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2439 thread->clear_critical_native_unlock(); |
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|
2440 } |
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2441 } |
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2442 |
| 0 | 2443 // We need to guarantee the Threads_lock here, since resumes are not |
| 2444 // allowed during safepoint synchronization | |
| 2445 // Can only resume from an external suspension | |
| 2446 void JavaThread::java_resume() { | |
| 2447 assert_locked_or_safepoint(Threads_lock); | |
| 2448 | |
| 2449 // Sanity check: thread is gone, has started exiting or the thread | |
| 2450 // was not externally suspended. | |
| 2451 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2452 return; | |
| 2453 } | |
| 2454 | |
| 2455 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2456 | |
| 2457 clear_external_suspend(); | |
| 2458 | |
| 2459 if (is_ext_suspended()) { | |
| 2460 clear_ext_suspended(); | |
| 2461 SR_lock()->notify_all(); | |
| 2462 } | |
| 2463 } | |
| 2464 | |
| 2465 void JavaThread::create_stack_guard_pages() { | |
| 2466 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2467 address low_addr = stack_base() - stack_size(); | |
| 2468 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2469 | |
| 2470 int allocate = os::allocate_stack_guard_pages(); | |
| 2471 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2472 | |
|
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2473 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2474 warning("Attempt to allocate stack guard pages failed."); |
| 2475 return; | |
| 2476 } | |
| 2477 | |
| 2478 if (os::guard_memory((char *) low_addr, len)) { | |
| 2479 _stack_guard_state = stack_guard_enabled; | |
| 2480 } else { | |
| 2481 warning("Attempt to protect stack guard pages failed."); | |
| 2482 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2483 warning("Attempt to deallocate stack guard pages failed."); | |
| 2484 } | |
| 2485 } | |
| 2486 } | |
| 2487 | |
| 2488 void JavaThread::remove_stack_guard_pages() { | |
|
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|
2489 assert(Thread::current() == this, "from different thread"); |
| 0 | 2490 if (_stack_guard_state == stack_guard_unused) return; |
| 2491 address low_addr = stack_base() - stack_size(); | |
| 2492 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2493 | |
| 2494 if (os::allocate_stack_guard_pages()) { | |
|
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2495 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2496 _stack_guard_state = stack_guard_unused; |
| 2497 } else { | |
| 2498 warning("Attempt to deallocate stack guard pages failed."); | |
| 2499 } | |
| 2500 } else { | |
| 2501 if (_stack_guard_state == stack_guard_unused) return; | |
| 2502 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2503 _stack_guard_state = stack_guard_unused; | |
| 2504 } else { | |
| 2505 warning("Attempt to unprotect stack guard pages failed."); | |
| 2506 } | |
| 2507 } | |
| 2508 } | |
| 2509 | |
| 2510 void JavaThread::enable_stack_yellow_zone() { | |
| 2511 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2512 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2513 | |
| 2514 // The base notation is from the stacks point of view, growing downward. | |
| 2515 // We need to adjust it to work correctly with guard_memory() | |
| 2516 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2517 | |
| 2518 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2519 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2520 | |
| 2521 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2522 _stack_guard_state = stack_guard_enabled; | |
| 2523 } else { | |
| 2524 warning("Attempt to guard stack yellow zone failed."); | |
| 2525 } | |
| 2526 enable_register_stack_guard(); | |
| 2527 } | |
| 2528 | |
| 2529 void JavaThread::disable_stack_yellow_zone() { | |
| 2530 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2531 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2532 | |
| 2533 // Simply return if called for a thread that does not use guard pages. | |
| 2534 if (_stack_guard_state == stack_guard_unused) return; | |
| 2535 | |
| 2536 // The base notation is from the stacks point of view, growing downward. | |
| 2537 // We need to adjust it to work correctly with guard_memory() | |
| 2538 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2539 | |
| 2540 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2541 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2542 } else { | |
| 2543 warning("Attempt to unguard stack yellow zone failed."); | |
| 2544 } | |
| 2545 disable_register_stack_guard(); | |
| 2546 } | |
| 2547 | |
| 2548 void JavaThread::enable_stack_red_zone() { | |
| 2549 // The base notation is from the stacks point of view, growing downward. | |
| 2550 // We need to adjust it to work correctly with guard_memory() | |
| 2551 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2552 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2553 | |
| 2554 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2555 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2556 | |
| 2557 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2558 warning("Attempt to guard stack red zone failed."); | |
| 2559 } | |
| 2560 } | |
| 2561 | |
| 2562 void JavaThread::disable_stack_red_zone() { | |
| 2563 // The base notation is from the stacks point of view, growing downward. | |
| 2564 // We need to adjust it to work correctly with guard_memory() | |
| 2565 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2566 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2567 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2568 warning("Attempt to unguard stack red zone failed."); | |
| 2569 } | |
| 2570 } | |
| 2571 | |
| 2572 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2573 // ignore is there is no stack | |
| 2574 if (!has_last_Java_frame()) return; | |
| 2575 // traverse the stack frames. Starts from top frame. | |
| 2576 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2577 frame* fr = fst.current(); | |
| 2578 f(fr, fst.register_map()); | |
| 2579 } | |
| 2580 } | |
| 2581 | |
| 2582 | |
| 2583 #ifndef PRODUCT | |
| 2584 // Deoptimization | |
| 2585 // Function for testing deoptimization | |
| 2586 void JavaThread::deoptimize() { | |
| 2587 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2588 StackFrameStream fst(this, UseBiasedLocking); | |
| 2589 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2590 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2591 // Iterate over all frames in the thread and deoptimize | |
| 2592 for(; !fst.is_done(); fst.next()) { | |
| 2593 if(fst.current()->can_be_deoptimized()) { | |
| 2594 | |
| 2595 if (only_at) { | |
| 2596 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2597 // consists of comma or carriage return separated numbers so | |
| 2598 // search for the current bci in that string. | |
| 2599 address pc = fst.current()->pc(); | |
| 2600 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2601 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2602 char buffer[8]; | |
| 2603 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2604 size_t len = strlen(buffer); | |
| 2605 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2606 while (found != NULL) { | |
| 2607 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2608 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2609 // Check that the bci found is bracketed by terminators. | |
| 2610 break; | |
| 2611 } | |
| 2612 found = strstr(found + 1, buffer); | |
| 2613 } | |
| 2614 if (!found) { | |
| 2615 continue; | |
| 2616 } | |
| 2617 } | |
| 2618 | |
| 2619 if (DebugDeoptimization && !deopt) { | |
| 2620 deopt = true; // One-time only print before deopt | |
| 2621 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2622 trace_frames(); | |
| 2623 trace_stack(); | |
| 2624 } | |
| 2625 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2626 } | |
| 2627 } | |
| 2628 | |
| 2629 if (DebugDeoptimization && deopt) { | |
| 2630 tty->print_cr("[AFTER Deoptimization]"); | |
| 2631 trace_frames(); | |
| 2632 } | |
| 2633 } | |
| 2634 | |
| 2635 | |
| 2636 // Make zombies | |
| 2637 void JavaThread::make_zombies() { | |
| 2638 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2639 if (fst.current()->can_be_deoptimized()) { | |
| 2640 // it is a Java nmethod | |
| 2641 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2642 nm->make_not_entrant(); | |
| 2643 } | |
| 2644 } | |
| 2645 } | |
| 2646 #endif // PRODUCT | |
| 2647 | |
| 2648 | |
| 2649 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2650 if (!has_last_Java_frame()) return; | |
| 2651 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2652 StackFrameStream fst(this, UseBiasedLocking); | |
| 2653 for(; !fst.is_done(); fst.next()) { | |
| 2654 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2655 if (LogCompilation && xtty != NULL) { |
| 2656 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2657 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2658 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2659 } | |
| 2660 | |
| 0 | 2661 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2662 } | |
| 2663 } | |
| 2664 } | |
| 2665 | |
| 2666 | |
| 2667 // GC support | |
| 2668 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2669 | |
| 2670 void JavaThread::gc_epilogue() { | |
| 2671 frames_do(frame_gc_epilogue); | |
| 2672 } | |
| 2673 | |
| 2674 | |
| 2675 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2676 | |
| 2677 void JavaThread::gc_prologue() { | |
| 2678 frames_do(frame_gc_prologue); | |
| 2679 } | |
| 2680 | |
|
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2681 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2682 // the given JavaThread in its _processed_thread field. |
|
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|
2683 class RememberProcessedThread: public StackObj { |
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2684 NamedThread* _cur_thr; |
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2685 public: |
|
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2686 RememberProcessedThread(JavaThread* jthr) { |
|
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2687 Thread* thread = Thread::current(); |
|
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2688 if (thread->is_Named_thread()) { |
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2689 _cur_thr = (NamedThread *)thread; |
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2690 _cur_thr->set_processed_thread(jthr); |
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2691 } else { |
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2692 _cur_thr = NULL; |
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2693 } |
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2694 } |
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2695 |
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2696 ~RememberProcessedThread() { |
|
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2697 if (_cur_thr) { |
|
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2698 _cur_thr->set_processed_thread(NULL); |
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2699 } |
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2700 } |
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2701 }; |
| 0 | 2702 |
|
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2703 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 1166 | 2704 // Verify that the deferred card marks have been flushed. |
| 2705 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2706 |
| 0 | 2707 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2708 // since there may be more than one thread using each ThreadProfiler. | |
| 2709 | |
| 2710 // Traverse the GCHandles | |
|
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2711 Thread::oops_do(f, cld_f, cf); |
| 0 | 2712 |
| 2713 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2714 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2715 | |
| 2716 if (has_last_Java_frame()) { | |
|
1119
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2717 // Record JavaThread to GC thread |
|
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|
2718 RememberProcessedThread rpt(this); |
| 0 | 2719 |
| 2720 // Traverse the privileged stack | |
| 2721 if (_privileged_stack_top != NULL) { | |
| 2722 _privileged_stack_top->oops_do(f); | |
| 2723 } | |
| 2724 | |
| 2725 // traverse the registered growable array | |
| 2726 if (_array_for_gc != NULL) { | |
| 2727 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2728 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2729 } | |
| 2730 } | |
| 2731 | |
| 2732 // Traverse the monitor chunks | |
| 2733 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2734 chunk->oops_do(f); | |
| 2735 } | |
| 2736 | |
| 2737 // Traverse the execution stack | |
| 2738 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2739 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
| 0 | 2740 } |
| 2741 } | |
| 2742 | |
| 2743 // callee_target is never live across a gc point so NULL it here should | |
| 2744 // it still contain a methdOop. | |
| 2745 | |
| 2746 set_callee_target(NULL); | |
| 2747 | |
| 2748 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2749 // If we have deferred set_locals there might be oops waiting to be | |
| 2750 // written | |
| 2751 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2752 if (list != NULL) { | |
| 2753 for (int i = 0; i < list->length(); i++) { | |
| 2754 list->at(i)->oops_do(f); | |
| 2755 } | |
| 2756 } | |
| 2757 | |
| 2758 // Traverse instance variables at the end since the GC may be moving things | |
| 2759 // around using this function | |
| 2760 f->do_oop((oop*) &_threadObj); | |
| 2761 f->do_oop((oop*) &_vm_result); | |
| 2762 f->do_oop((oop*) &_exception_oop); | |
| 2763 f->do_oop((oop*) &_pending_async_exception); | |
| 2764 | |
| 2765 if (jvmti_thread_state() != NULL) { | |
| 2766 jvmti_thread_state()->oops_do(f); | |
| 2767 } | |
| 2768 } | |
| 2769 | |
|
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2770 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2771 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2772 |
| 2773 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2774 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2775 | |
| 2776 if (has_last_Java_frame()) { | |
| 2777 // Traverse the execution stack | |
| 2778 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2779 fst.current()->nmethods_do(cf); |
| 0 | 2780 } |
| 2781 } | |
| 2782 } | |
| 2783 | |
|
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2784 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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2785 Thread::metadata_do(f); |
|
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2786 if (has_last_Java_frame()) { |
|
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2787 // Traverse the execution stack to call f() on the methods in the stack |
|
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2788 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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2789 fst.current()->metadata_do(f); |
|
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2790 } |
|
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|
2791 } else if (is_Compiler_thread()) { |
|
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2792 // need to walk ciMetadata in current compile tasks to keep alive. |
|
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2793 CompilerThread* ct = (CompilerThread*)this; |
|
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2794 if (ct->env() != NULL) { |
|
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2795 ct->env()->metadata_do(f); |
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2796 } |
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2797 } |
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2798 } |
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|
2799 |
| 0 | 2800 // Printing |
| 2801 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2802 switch (_thread_state) { | |
| 2803 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2804 case _thread_new: return "_thread_new"; | |
| 2805 case _thread_new_trans: return "_thread_new_trans"; | |
| 2806 case _thread_in_native: return "_thread_in_native"; | |
| 2807 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2808 case _thread_in_vm: return "_thread_in_vm"; | |
| 2809 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2810 case _thread_in_Java: return "_thread_in_Java"; | |
| 2811 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2812 case _thread_blocked: return "_thread_blocked"; | |
| 2813 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2814 default: return "unknown thread state"; | |
| 2815 } | |
| 2816 } | |
| 2817 | |
| 2818 #ifndef PRODUCT | |
| 2819 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2820 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2821 }; | |
| 2822 void JavaThread::print_thread_state() const { | |
| 2823 print_thread_state_on(tty); | |
| 2824 }; | |
| 2825 #endif // PRODUCT | |
| 2826 | |
| 2827 // Called by Threads::print() for VM_PrintThreads operation | |
| 2828 void JavaThread::print_on(outputStream *st) const { | |
| 2829 st->print("\"%s\" ", get_thread_name()); | |
| 2830 oop thread_oop = threadObj(); | |
| 6766 | 2831 if (thread_oop != NULL) { |
| 2832 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2833 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2834 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2835 } | |
| 0 | 2836 Thread::print_on(st); |
| 2837 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2838 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2839 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2840 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2841 } | |
| 2842 #ifndef PRODUCT | |
| 2843 print_thread_state_on(st); | |
| 2844 _safepoint_state->print_on(st); | |
| 2845 #endif // PRODUCT | |
| 2846 } | |
| 2847 | |
| 2848 // Called by fatal error handler. The difference between this and | |
| 2849 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2850 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2851 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2852 oop thread_obj = threadObj(); | |
| 2853 if (thread_obj != NULL) { | |
| 2854 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2855 } | |
| 2856 st->print(" ["); | |
| 2857 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2858 if (osthread()) { | |
| 2859 st->print(", id=%d", osthread()->thread_id()); | |
| 2860 } | |
| 2861 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2862 _stack_base - _stack_size, _stack_base); | |
| 2863 st->print("]"); | |
| 2864 return; | |
| 2865 } | |
| 2866 | |
| 2867 // Verification | |
| 2868 | |
| 2869 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2870 | |
| 2871 void JavaThread::verify() { | |
| 2872 // Verify oops in the thread. | |
|
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2873 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
| 0 | 2874 |
| 2875 // Verify the stack frames. | |
| 2876 frames_do(frame_verify); | |
| 2877 } | |
| 2878 | |
| 2879 // CR 6300358 (sub-CR 2137150) | |
| 2880 // Most callers of this method assume that it can't return NULL but a | |
| 2881 // thread may not have a name whilst it is in the process of attaching to | |
| 2882 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2883 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2884 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2885 // for such that this method never returns NULL. | |
| 2886 const char* JavaThread::get_thread_name() const { | |
| 2887 #ifdef ASSERT | |
| 2888 // early safepoints can hit while current thread does not yet have TLS | |
| 2889 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2890 Thread *cur = Thread::current(); | |
| 2891 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2892 // Current JavaThreads are allowed to get their own name without | |
| 2893 // the Threads_lock. | |
| 2894 assert_locked_or_safepoint(Threads_lock); | |
| 2895 } | |
| 2896 } | |
| 2897 #endif // ASSERT | |
| 2898 return get_thread_name_string(); | |
| 2899 } | |
| 2900 | |
| 2901 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2902 // descriptive string if there is no set name | |
| 2903 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2904 const char* name_str; | |
| 2905 oop thread_obj = threadObj(); | |
| 2906 if (thread_obj != NULL) { | |
| 2907 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2908 if (name != NULL) { | |
| 2909 if (buf == NULL) { | |
| 2910 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2911 } | |
| 2912 else { | |
| 2913 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2914 } | |
| 2915 } | |
| 4006 | 2916 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2917 name_str = "<no-name - thread is attaching>"; |
| 2918 } | |
| 2919 else { | |
| 2920 name_str = Thread::name(); | |
| 2921 } | |
| 2922 } | |
| 2923 else { | |
| 2924 name_str = Thread::name(); | |
| 2925 } | |
| 2926 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2927 return name_str; | |
| 2928 } | |
| 2929 | |
| 2930 | |
| 2931 const char* JavaThread::get_threadgroup_name() const { | |
| 2932 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2933 oop thread_obj = threadObj(); | |
| 2934 if (thread_obj != NULL) { | |
| 2935 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2936 if (thread_group != NULL) { | |
| 2937 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2938 // ThreadGroup.name can be null | |
| 2939 if (name != NULL) { | |
| 2940 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2941 return str; | |
| 2942 } | |
| 2943 } | |
| 2944 } | |
| 2945 return NULL; | |
| 2946 } | |
| 2947 | |
| 2948 const char* JavaThread::get_parent_name() const { | |
| 2949 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2950 oop thread_obj = threadObj(); | |
| 2951 if (thread_obj != NULL) { | |
| 2952 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2953 if (thread_group != NULL) { | |
| 2954 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2955 if (parent != NULL) { | |
| 2956 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2957 // ThreadGroup.name can be null | |
| 2958 if (name != NULL) { | |
| 2959 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2960 return str; | |
| 2961 } | |
| 2962 } | |
| 2963 } | |
| 2964 } | |
| 2965 return NULL; | |
| 2966 } | |
| 2967 | |
| 2968 ThreadPriority JavaThread::java_priority() const { | |
| 2969 oop thr_oop = threadObj(); | |
| 2970 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2971 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2972 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2973 return priority; | |
| 2974 } | |
| 2975 | |
| 2976 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2977 | |
| 2978 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2979 // Link Java Thread object <-> C++ Thread | |
| 2980 | |
| 2981 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2982 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2983 // be used to pass the C++ thread object to other methods. | |
| 2984 | |
| 2985 // Set the Java level thread object (jthread) field of the | |
| 2986 // new thread (a JavaThread *) to C++ thread object using the | |
| 2987 // "thread_oop" handle. | |
| 2988 | |
| 2989 // Set the thread field (a JavaThread *) of the | |
| 2990 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2991 | |
| 2992 Handle thread_oop(Thread::current(), | |
| 2993 JNIHandles::resolve_non_null(jni_thread)); | |
|
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2994 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 2995 "must be initialized"); |
| 2996 set_threadObj(thread_oop()); | |
| 2997 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2998 | |
| 2999 if (prio == NoPriority) { | |
| 3000 prio = java_lang_Thread::priority(thread_oop()); | |
| 3001 assert(prio != NoPriority, "A valid priority should be present"); | |
| 3002 } | |
| 3003 | |
| 3004 // Push the Java priority down to the native thread; needs Threads_lock | |
| 3005 Thread::set_priority(this, prio); | |
| 3006 | |
| 3007 // Add the new thread to the Threads list and set it in motion. | |
| 3008 // We must have threads lock in order to call Threads::add. | |
| 3009 // It is crucial that we do not block before the thread is | |
| 3010 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 3011 // will not be visited by GC. | |
| 3012 Threads::add(this); | |
| 3013 } | |
| 3014 | |
| 3015 oop JavaThread::current_park_blocker() { | |
| 3016 // Support for JSR-166 locks | |
| 3017 oop thread_oop = threadObj(); | |
| 242 | 3018 if (thread_oop != NULL && |
| 3019 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 3020 return java_lang_Thread::park_blocker(thread_oop); |
| 3021 } | |
| 3022 return NULL; | |
| 3023 } | |
| 3024 | |
| 3025 | |
| 3026 void JavaThread::print_stack_on(outputStream* st) { | |
| 3027 if (!has_last_Java_frame()) return; | |
| 3028 ResourceMark rm; | |
| 3029 HandleMark hm; | |
| 3030 | |
| 3031 RegisterMap reg_map(this); | |
| 3032 vframe* start_vf = last_java_vframe(®_map); | |
| 3033 int count = 0; | |
| 3034 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3035 if (f->is_java_frame()) { | |
| 3036 javaVFrame* jvf = javaVFrame::cast(f); | |
| 3037 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 3038 | |
| 3039 // Print out lock information | |
| 3040 if (JavaMonitorsInStackTrace) { | |
| 3041 jvf->print_lock_info_on(st, count); | |
| 3042 } | |
| 3043 } else { | |
| 3044 // Ignore non-Java frames | |
| 3045 } | |
| 3046 | |
| 3047 // Bail-out case for too deep stacks | |
| 3048 count++; | |
| 3049 if (MaxJavaStackTraceDepth == count) return; | |
| 3050 } | |
| 3051 } | |
| 3052 | |
| 3053 | |
| 3054 // JVMTI PopFrame support | |
| 3055 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 3056 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 3057 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 3058 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 3059 _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
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parents:
1584
diff
changeset
|
3060 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 3061 } |
| 3062 } | |
| 3063 | |
| 3064 void* JavaThread::popframe_preserved_args() { | |
| 3065 return _popframe_preserved_args; | |
| 3066 } | |
| 3067 | |
| 3068 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3069 return in_ByteSize(_popframe_preserved_args_size); | |
| 3070 } | |
| 3071 | |
| 3072 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3073 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3074 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3075 return in_WordSize(sz / wordSize); | |
| 3076 } | |
| 3077 | |
| 3078 void JavaThread::popframe_free_preserved_args() { | |
| 3079 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3080 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3081 _popframe_preserved_args = NULL; |
| 3082 _popframe_preserved_args_size = 0; | |
| 3083 } | |
| 3084 | |
| 3085 #ifndef PRODUCT | |
| 3086 | |
| 3087 void JavaThread::trace_frames() { | |
| 3088 tty->print_cr("[Describe stack]"); | |
| 3089 int frame_no = 1; | |
| 3090 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3091 tty->print(" %d. ", frame_no++); | |
| 3092 fst.current()->print_value_on(tty,this); | |
| 3093 tty->cr(); | |
| 3094 } | |
| 3095 } | |
| 3096 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3097 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3098 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3099 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
|
3100 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3101 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3102 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3103 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3104 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3105 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
|
3106 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3107 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3108 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3109 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3110 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
|
3111 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3112 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3113 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3114 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3115 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
|
3116 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
|
3117 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3118 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3119 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3120 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3121 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3122 f->print_value(); |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3123 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
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|
3124 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3125 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3126 // Print our all the locations that contain oops and whether they are |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3127 // valid or not. This useful when trying to find the oldest frame |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3128 // where an oop has gone bad since the frame walk is from youngest to |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3129 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3130 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3131 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3132 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3133 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3134 |
| 0 | 3135 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3136 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3137 // Print or validate the layout of stack frames |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3138 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3139 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3140 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3141 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3142 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3143 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3144 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3145 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3146 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3147 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3148 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3149 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3150 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3151 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3152 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3153 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3154 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3155 |
| 0 | 3156 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3157 ResourceMark rm; | |
| 3158 int vframe_no = 1; | |
| 3159 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3160 if (f->is_java_frame()) { | |
| 3161 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3162 } else { | |
| 3163 f->print(); | |
| 3164 } | |
| 3165 if (vframe_no > StackPrintLimit) { | |
| 3166 tty->print_cr("...<more frames>..."); | |
| 3167 return; | |
| 3168 } | |
| 3169 } | |
| 3170 } | |
| 3171 | |
| 3172 | |
| 3173 void JavaThread::trace_stack() { | |
| 3174 if (!has_last_Java_frame()) return; | |
| 3175 ResourceMark rm; | |
| 3176 HandleMark hm; | |
| 3177 RegisterMap reg_map(this); | |
| 3178 trace_stack_from(last_java_vframe(®_map)); | |
| 3179 } | |
| 3180 | |
| 3181 | |
| 3182 #endif // PRODUCT | |
| 3183 | |
| 3184 | |
| 3185 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3186 assert(reg_map != NULL, "a map must be given"); | |
| 3187 frame f = last_frame(); | |
| 3188 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3189 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3190 } | |
| 3191 return NULL; | |
| 3192 } | |
| 3193 | |
| 3194 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3195 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3196 vframeStream vfst(this); |
| 3197 vfst.security_get_caller_frame(depth); | |
| 3198 if (!vfst.at_end()) { | |
| 3199 return vfst.method()->method_holder(); | |
| 3200 } | |
| 3201 return NULL; | |
| 3202 } | |
| 3203 | |
| 3204 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3205 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3206 CompileBroker::compiler_thread_loop(); | |
| 3207 } | |
| 3208 | |
| 3209 // Create a CompilerThread | |
| 3210 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3211 : JavaThread(&compiler_thread_entry) { | |
| 3212 _env = NULL; | |
| 3213 _log = NULL; | |
| 3214 _task = NULL; | |
| 3215 _queue = queue; | |
| 3216 _counters = counters; | |
| 1584 | 3217 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3218 _scanned_nmethod = NULL; |
|
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
parents:
12316
diff
changeset
|
3219 _compiler = NULL; |
| 0 | 3220 |
| 3221 #ifndef PRODUCT | |
| 3222 _ideal_graph_printer = NULL; | |
| 3223 #endif | |
| 3224 } | |
| 3225 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3226 void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
|
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3227 JavaThread::oops_do(f, cld_f, cf); |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3228 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3229 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3230 // process it here to make sure it isn't unloaded in the middle of |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3231 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3232 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3233 } |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3234 } |
| 0 | 3235 |
|
12880
469216acdb28
8023014: CodeSweeperSweepNoFlushTest.java fails with HS crash
anoll
parents:
12316
diff
changeset
|
3236 |
| 0 | 3237 // ======= Threads ======== |
| 3238 | |
| 3239 // The Threads class links together all active threads, and provides | |
| 3240 // operations over all threads. It is protected by its own Mutex | |
| 3241 // lock, which is also used in other contexts to protect thread | |
| 3242 // operations from having the thread being operated on from exiting | |
| 3243 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3244 | |
| 3245 JavaThread* Threads::_thread_list = NULL; | |
| 3246 int Threads::_number_of_threads = 0; | |
| 3247 int Threads::_number_of_non_daemon_threads = 0; | |
| 3248 int Threads::_return_code = 0; | |
| 3249 size_t JavaThread::_stack_size_at_create = 0; | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3250 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3251 bool Threads::_vm_complete = false; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3252 #endif |
| 0 | 3253 |
| 3254 // All JavaThreads | |
| 3255 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3256 | |
| 3257 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3258 void Threads::threads_do(ThreadClosure* tc) { | |
| 3259 assert_locked_or_safepoint(Threads_lock); | |
| 3260 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3261 ALL_JAVA_THREADS(p) { | |
| 3262 tc->do_thread(p); | |
| 3263 } | |
| 3264 // Someday we could have a table or list of all non-JavaThreads. | |
| 3265 // For now, just manually iterate through them. | |
| 3266 tc->do_thread(VMThread::vm_thread()); | |
| 3267 Universe::heap()->gc_threads_do(tc); | |
|
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3268 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3269 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3270 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3271 // considering that WatchThread terminates when the VM is on the way to |
|
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|
3272 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3273 // way to prevent termination of WatcherThread would be to acquire |
|
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|
3274 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3275 // checking in some cases. |
|
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|
3276 if (wt != NULL) |
|
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|
3277 tc->do_thread(wt); |
|
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|
3278 |
| 0 | 3279 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3280 } | |
| 3281 | |
|
14297
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diff
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|
3282 |
|
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|
3283 void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) { |
|
febc6428bc79
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diff
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|
3284 TraceTime timer("Initialize java.lang classes", TraceStartupTime); |
|
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diff
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|
3285 |
|
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diff
changeset
|
3286 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { |
|
febc6428bc79
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|
3287 create_vm_init_libraries(); |
|
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diff
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|
3288 } |
|
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diff
changeset
|
3289 |
|
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diff
changeset
|
3290 initialize_class(vmSymbols::java_lang_String(), CHECK); |
|
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|
3291 |
|
febc6428bc79
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diff
changeset
|
3292 // Initialize java_lang.System (needed before creating the thread) |
|
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diff
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|
3293 initialize_class(vmSymbols::java_lang_System(), CHECK); |
|
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coleenp
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|
3294 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK); |
|
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coleenp
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diff
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|
3295 Handle thread_group = create_initial_thread_group(CHECK); |
|
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|
3296 Universe::set_main_thread_group(thread_group()); |
|
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|
3297 initialize_class(vmSymbols::java_lang_Thread(), CHECK); |
|
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|
3298 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK); |
|
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|
3299 main_thread->set_threadObj(thread_object); |
|
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|
3300 // Set thread status to running since main thread has |
|
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|
3301 // been started and running. |
|
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diff
changeset
|
3302 java_lang_Thread::set_thread_status(thread_object, |
|
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coleenp
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diff
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|
3303 java_lang_Thread::RUNNABLE); |
|
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diff
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|
3304 |
|
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diff
changeset
|
3305 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
febc6428bc79
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coleenp
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diff
changeset
|
3306 initialize_class(vmSymbols::java_lang_Class(), CHECK); |
|
febc6428bc79
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coleenp
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diff
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|
3307 |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
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diff
changeset
|
3308 // The VM preresolves methods to these classes. Make sure that they get initialized |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3309 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3310 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK); |
|
febc6428bc79
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coleenp
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diff
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|
3311 call_initializeSystemClass(CHECK); |
|
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8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
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|
3312 |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3313 // get the Java runtime name after java.lang.System is initialized |
|
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diff
changeset
|
3314 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3315 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
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|
3316 |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
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14291
diff
changeset
|
3317 // an instance of OutOfMemory exception has been allocated earlier |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3318 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK); |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3319 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK); |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3320 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3321 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3322 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3323 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3324 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3325 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3326 } |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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diff
changeset
|
3327 |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3328 void Threads::initialize_jsr292_core_classes(TRAPS) { |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
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14291
diff
changeset
|
3329 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK); |
|
febc6428bc79
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coleenp
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diff
changeset
|
3330 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK); |
|
febc6428bc79
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coleenp
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14291
diff
changeset
|
3331 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK); |
|
febc6428bc79
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diff
changeset
|
3332 } |
|
febc6428bc79
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14291
diff
changeset
|
3333 |
| 0 | 3334 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { |
| 3335 | |
| 242 | 3336 extern void JDK_Version_init(); |
| 3337 | |
| 0 | 3338 // Check version |
| 3339 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3340 | |
| 3341 // Initialize the output stream module | |
| 3342 ostream_init(); | |
| 3343 | |
| 3344 // Process java launcher properties. | |
| 3345 Arguments::process_sun_java_launcher_properties(args); | |
| 3346 | |
| 3347 // Initialize the os module before using TLS | |
| 3348 os::init(); | |
| 3349 | |
| 3350 // Initialize system properties. | |
| 3351 Arguments::init_system_properties(); | |
| 3352 | |
| 14309 | 3353 // So that JDK version can be used as a discriminator when parsing arguments |
| 242 | 3354 JDK_Version_init(); |
| 3355 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3356 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3357 Arguments::init_version_specific_system_properties(); |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
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1731
diff
changeset
|
3358 |
| 0 | 3359 // Parse arguments |
| 3360 jint parse_result = Arguments::parse(args); | |
| 3361 if (parse_result != JNI_OK) return parse_result; | |
| 3362 | |
|
12233
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3363 os::init_before_ergo(); |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3364 |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3365 jint ergo_result = Arguments::apply_ergo(); |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3366 if (ergo_result != JNI_OK) return ergo_result; |
|
40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents:
12173
diff
changeset
|
3367 |
| 0 | 3368 if (PauseAtStartup) { |
| 3369 os::pause(); | |
| 3370 } | |
| 3371 | |
| 4006 | 3372 HOTSPOT_VM_INIT_BEGIN(); |
| 0 | 3373 |
| 3374 // Record VM creation timing statistics | |
| 3375 TraceVmCreationTime create_vm_timer; | |
| 3376 create_vm_timer.start(); | |
| 3377 | |
| 3378 // Timing (must come after argument parsing) | |
| 3379 TraceTime timer("Create VM", TraceStartupTime); | |
| 3380 | |
| 3381 // Initialize the os module after parsing the args | |
| 3382 jint os_init_2_result = os::init_2(); | |
| 3383 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3384 | |
|
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3385 jint adjust_after_os_result = Arguments::adjust_after_os(); |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
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6985
diff
changeset
|
3386 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
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6985
diff
changeset
|
3387 |
| 14309 | 3388 // initialize TLS |
| 6197 | 3389 ThreadLocalStorage::init(); |
| 3390 | |
| 3391 // Bootstrap native memory tracking, so it can start recording memory | |
| 3392 // activities before worker thread is started. This is the first phase | |
| 3393 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3394 MemTracker::bootstrap_single_thread(); | |
| 3395 | |
| 0 | 3396 // Initialize output stream logging |
| 3397 ostream_init_log(); | |
| 3398 | |
| 3399 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3400 // Must be before create_vm_init_agents() | |
| 3401 if (Arguments::init_libraries_at_startup()) { | |
| 3402 convert_vm_init_libraries_to_agents(); | |
| 3403 } | |
| 3404 | |
| 3405 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3406 if (Arguments::init_agents_at_startup()) { | |
| 3407 create_vm_init_agents(); | |
| 3408 } | |
| 3409 | |
| 3410 // Initialize Threads state | |
| 3411 _thread_list = NULL; | |
| 3412 _number_of_threads = 0; | |
| 3413 _number_of_non_daemon_threads = 0; | |
| 3414 | |
| 3415 // Initialize global data structures and create system classes in heap | |
| 3416 vm_init_globals(); | |
| 3417 | |
| 3418 // Attach the main thread to this os thread | |
| 3419 JavaThread* main_thread = new JavaThread(); | |
| 3420 main_thread->set_thread_state(_thread_in_vm); | |
| 3421 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3422 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3423 // change the stack size recorded here to one based on the java thread | |
| 3424 // stacksize. This adjusted size is what is used to figure the placement | |
| 3425 // of the guard pages. | |
| 3426 main_thread->record_stack_base_and_size(); | |
| 3427 main_thread->initialize_thread_local_storage(); | |
| 3428 | |
| 3429 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3430 | |
| 3431 if (!main_thread->set_as_starting_thread()) { | |
| 3432 vm_shutdown_during_initialization( | |
| 3433 "Failed necessary internal allocation. Out of swap space"); | |
| 3434 delete main_thread; | |
| 3435 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3436 return JNI_ENOMEM; | |
| 3437 } | |
| 3438 | |
| 3439 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3440 // crash Linux VM, see notes in os_linux.cpp. | |
| 3441 main_thread->create_stack_guard_pages(); | |
| 3442 | |
| 1878 | 3443 // Initialize Java-Level synchronization subsystem |
| 3444 ObjectMonitor::Initialize() ; | |
| 0 | 3445 |
| 6197 | 3446 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3447 MemTracker::bootstrap_multi_thread(); | |
| 3448 | |
| 0 | 3449 // Initialize global modules |
| 3450 jint status = init_globals(); | |
| 3451 if (status != JNI_OK) { | |
| 3452 delete main_thread; | |
| 3453 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3454 return status; | |
| 3455 } | |
| 3456 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3457 // Should be done after the heap is fully created |
|
126ea7725993
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bobv
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1608
diff
changeset
|
3458 main_thread->cache_global_variables(); |
|
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bobv
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1608
diff
changeset
|
3459 |
| 0 | 3460 HandleMark hm; |
| 3461 | |
| 3462 { MutexLocker mu(Threads_lock); | |
| 3463 Threads::add(main_thread); | |
| 3464 } | |
| 3465 | |
| 3466 // Any JVMTI raw monitors entered in onload will transition into | |
| 3467 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3468 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3469 | |
| 6197 | 3470 // Fully start NMT |
| 3471 MemTracker::start(); | |
| 3472 | |
| 0 | 3473 // Create the VMThread |
| 3474 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3475 VMThread::create(); | |
| 3476 Thread* vmthread = VMThread::vm_thread(); | |
| 3477 | |
| 3478 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3479 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3480 | |
| 3481 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3482 // Monitors can have spurious returns, must always check another state flag | |
| 3483 { | |
| 3484 MutexLocker ml(Notify_lock); | |
| 3485 os::start_thread(vmthread); | |
| 3486 while (vmthread->active_handles() == NULL) { | |
| 3487 Notify_lock->wait(); | |
| 3488 } | |
| 3489 } | |
| 3490 } | |
| 3491 | |
| 3492 assert (Universe::is_fully_initialized(), "not initialized"); | |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3493 if (VerifyDuringStartup) { |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3494 // Make sure we're starting with a clean slate. |
|
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3495 VM_Verify verify_op; |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3496 VMThread::execute(&verify_op); |
|
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3497 } |
|
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
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8793
diff
changeset
|
3498 |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3499 Thread* THREAD = Thread::current(); |
| 0 | 3500 |
| 3501 // At this point, the Universe is initialized, but we have not executed | |
| 3502 // any byte code. Now is a good time (the only time) to dump out the | |
| 3503 // internal state of the JVM for sharing. | |
| 3504 if (DumpSharedSpaces) { | |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3505 MetaspaceShared::preload_and_dump(CHECK_JNI_ERR); |
| 0 | 3506 ShouldNotReachHere(); |
| 3507 } | |
| 3508 | |
| 3509 // Always call even when there are not JVMTI environments yet, since environments | |
| 3510 // may be attached late and JVMTI must track phases of VM execution | |
| 3511 JvmtiExport::enter_start_phase(); | |
| 3512 | |
| 3513 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3514 JvmtiExport::post_vm_start(); | |
| 3515 | |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3516 initialize_java_lang_classes(main_thread, CHECK_JNI_ERR); |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3517 |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3518 // We need this for ClassDataSharing - the initial vm.info property is set |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3519 // with the default value of CDS "sharing" which may be reset through |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3520 // command line options. |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3521 reset_vm_info_property(CHECK_JNI_ERR); |
| 0 | 3522 |
| 3523 quicken_jni_functions(); | |
| 3524 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3525 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3526 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3527 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3528 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3529 |
| 0 | 3530 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3531 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3532 set_init_completed(); | |
| 3533 | |
| 4006 | 3534 HOTSPOT_VM_INIT_END(); |
| 0 | 3535 |
| 3536 // record VM initialization completion time | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3537 #if INCLUDE_MANAGEMENT |
| 0 | 3538 Management::record_vm_init_completed(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3539 #endif // INCLUDE_MANAGEMENT |
| 0 | 3540 |
| 3541 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3542 // valid exceptions may be thrown in the process. | |
| 3543 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3544 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3545 // anymore. We call vm_exit_during_initialization directly instead. | |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3546 SystemDictionary::compute_java_system_loader(CHECK_JNI_ERR); |
| 0 | 3547 |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3548 #if INCLUDE_ALL_GCS |
| 0 | 3549 // Support for ConcurrentMarkSweep. This should be cleaned up |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3550 // 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
|
3551 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3552 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3553 if (UseConcMarkSweepGC) { |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3554 ConcurrentMarkSweepThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3555 } else { |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3556 ConcurrentMarkThread::makeSurrogateLockerThread(CHECK_JNI_ERR); |
| 0 | 3557 } |
| 3558 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3559 #endif // INCLUDE_ALL_GCS |
| 0 | 3560 |
| 3561 // Always call even when there are not JVMTI environments yet, since environments | |
| 3562 // may be attached late and JVMTI must track phases of VM execution | |
| 3563 JvmtiExport::enter_live_phase(); | |
| 3564 | |
| 3565 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3566 os::signal_init(); | |
| 3567 | |
| 3568 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3569 if (!DisableAttachMechanism) { | |
|
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3570 AttachListener::vm_start(); |
| 0 | 3571 if (StartAttachListener || AttachListener::init_at_startup()) { |
| 3572 AttachListener::init(); | |
| 3573 } | |
| 3574 } | |
| 3575 | |
| 3576 // Launch -Xrun agents | |
| 3577 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3578 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3579 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3580 create_vm_init_libraries(); | |
| 3581 } | |
| 3582 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3583 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3584 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3585 |
| 10405 | 3586 if (TRACE_START() != JNI_OK) { |
| 3587 vm_exit_during_initialization("Failed to start tracing backend."); | |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3588 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3589 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3590 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3591 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3592 } |
| 0 | 3593 |
| 3594 // initialize compiler(s) | |
| 7195 | 3595 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
| 0 | 3596 CompileBroker::compilation_init(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3597 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3598 |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3599 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3600 // It is done after compilers are initialized, because otherwise compilations of |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3601 // signature polymorphic MH intrinsics can be missed |
|
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3602 // (see SystemDictionary::find_method_handle_intrinsic). |
|
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3603 if (EnableInvokeDynamic) { |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3604 initialize_jsr292_core_classes(CHECK_JNI_ERR); |
|
12163
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3605 } |
|
74608df95ba3
8022595: JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
vlivanov
parents:
11154
diff
changeset
|
3606 |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3607 #if INCLUDE_MANAGEMENT |
| 0 | 3608 Management::initialize(THREAD); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3609 |
| 0 | 3610 if (HAS_PENDING_EXCEPTION) { |
| 3611 // management agent fails to start possibly due to | |
| 3612 // configuration problem and is responsible for printing | |
| 3613 // stack trace if appropriate. Simply exit VM. | |
| 3614 vm_exit(1); | |
| 3615 } | |
|
14297
febc6428bc79
8028275: Metaspace ShrinkGrowTest causes fatal error if run with JFR
coleenp
parents:
14291
diff
changeset
|
3616 #endif // INCLUDE_MANAGEMENT |
| 0 | 3617 |
| 3618 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3619 if (MemProfiling) MemProfiler::engage(); | |
| 3620 StatSampler::engage(); | |
| 3621 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3622 | |
| 3623 BiasedLocking::init(); | |
| 3624 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3625 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
|
3626 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3627 // 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
|
3628 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3629 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3630 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3631 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3632 } |
| 0 | 3633 |
|
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3634 { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3635 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3636 // Make sure the watcher thread can be started by WatcherThread::start() |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3637 // or by dynamic enrollment. |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3638 WatcherThread::make_startable(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3639 // Start up the WatcherThread if there are any periodic tasks |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3640 // NOTE: All PeriodicTasks should be registered by now. If they |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3641 // aren't, late joiners might appear to start slowly (we might |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3642 // take a while to process their first tick). |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3643 if (PeriodicTask::num_tasks() > 0) { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3644 WatcherThread::start(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3645 } |
| 0 | 3646 } |
| 3647 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3648 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3649 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3650 |
| 0 | 3651 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3652 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3653 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3654 #endif |
| 0 | 3655 return JNI_OK; |
| 3656 } | |
| 3657 | |
| 3658 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3659 extern "C" { | |
| 3660 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3661 } | |
| 3662 // Find a command line agent library and return its entry point for | |
| 3663 // -agentlib: -agentpath: -Xrun | |
| 3664 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3665 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3666 OnLoadEntry_t on_load_entry = NULL; | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3667 void *library = NULL; |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3668 |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3669 if (!agent->valid()) { |
| 0 | 3670 char buffer[JVM_MAXPATHLEN]; |
| 3671 char ebuf[1024]; | |
| 3672 const char *name = agent->name(); | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3673 const char *msg = "Could not find agent library "; |
| 0 | 3674 |
| 12220 | 3675 // First check to see if agent is statically linked into executable |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3676 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) { |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3677 library = agent->os_lib(); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3678 } else if (agent->is_absolute_path()) { |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3679 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3680 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3681 const char *sub_msg = " in absolute path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3682 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3683 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3684 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3685 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3686 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3687 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3688 } |
| 3689 } else { | |
| 3690 // Try to load the agent from the standard dll directory | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3691 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3692 name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3693 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3694 } |
| 0 | 3695 if (library == NULL) { // Try the local directory |
| 3696 char ns[1] = {0}; | |
|
6966
6cb0d32b828b
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|
3697 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
|
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|
3698 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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|
3699 } |
| 0 | 3700 if (library == NULL) { |
|
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|
3701 const char *sub_msg = " on the library path, with error: "; |
|
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|
3702 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3703 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
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|
3704 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3705 // If we can't find the agent, exit. |
|
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|
3706 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3707 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3708 } |
| 3709 } | |
| 3710 } | |
| 3711 agent->set_os_lib(library); | |
|
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|
3712 agent->set_valid(); |
| 0 | 3713 } |
| 3714 | |
| 3715 // Find the OnLoad function. | |
|
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|
3716 on_load_entry = |
|
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|
3717 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, |
|
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|
3718 false, |
|
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|
3719 on_load_symbols, |
|
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|
3720 num_symbol_entries)); |
| 0 | 3721 return on_load_entry; |
| 3722 } | |
| 3723 | |
| 3724 // Find the JVM_OnLoad entry point | |
| 3725 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3726 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3727 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3728 } | |
| 3729 | |
| 3730 // Find the Agent_OnLoad entry point | |
| 3731 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3732 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3733 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3734 } | |
| 3735 | |
| 3736 // For backwards compatibility with -Xrun | |
| 3737 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3738 // treated like -agentpath: | |
| 3739 // Must be called before agent libraries are created | |
| 3740 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3741 AgentLibrary* agent; | |
| 3742 AgentLibrary* next; | |
| 3743 | |
| 3744 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3745 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3746 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3747 | |
| 3748 // If there is an JVM_OnLoad function it will get called later, | |
| 3749 // otherwise see if there is an Agent_OnLoad | |
| 3750 if (on_load_entry == NULL) { | |
| 3751 on_load_entry = lookup_agent_on_load(agent); | |
| 3752 if (on_load_entry != NULL) { | |
| 3753 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3754 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3755 Arguments::convert_library_to_agent(agent); | |
| 3756 } else { | |
| 3757 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3758 } | |
| 3759 } | |
| 3760 } | |
| 3761 } | |
| 3762 | |
| 3763 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3764 // Invokes Agent_OnLoad | |
| 3765 // Called very early -- before JavaThreads exist | |
| 3766 void Threads::create_vm_init_agents() { | |
| 3767 extern struct JavaVM_ main_vm; | |
| 3768 AgentLibrary* agent; | |
| 3769 | |
| 3770 JvmtiExport::enter_onload_phase(); | |
|
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|
3771 |
| 0 | 3772 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3773 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3774 | |
| 3775 if (on_load_entry != NULL) { | |
| 3776 // Invoke the Agent_OnLoad function | |
| 3777 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3778 if (err != JNI_OK) { | |
| 3779 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3780 } | |
| 3781 } else { | |
| 3782 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3783 } | |
| 3784 } | |
| 3785 JvmtiExport::enter_primordial_phase(); | |
| 3786 } | |
| 3787 | |
| 3788 extern "C" { | |
| 3789 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3790 } | |
| 3791 | |
| 3792 void Threads::shutdown_vm_agents() { | |
| 3793 // Send any Agent_OnUnload notifications | |
| 3794 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
|
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|
3795 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); |
| 0 | 3796 extern struct JavaVM_ main_vm; |
| 3797 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3798 | |
| 3799 // Find the Agent_OnUnload function. | |
|
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|
3800 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
|
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|
3801 os::find_agent_function(agent, |
|
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|
3802 false, |
|
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|
3803 on_unload_symbols, |
|
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|
3804 num_symbol_entries)); |
|
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diff
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|
3805 |
|
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|
3806 // Invoke the Agent_OnUnload function |
|
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8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
changeset
|
3807 if (unload_entry != NULL) { |
|
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8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
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|
3808 JavaThread* thread = JavaThread::current(); |
|
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|
3809 ThreadToNativeFromVM ttn(thread); |
|
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|
3810 HandleMark hm(thread); |
|
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|
3811 (*unload_entry)(&main_vm); |
| 0 | 3812 } |
| 3813 } | |
| 3814 } | |
| 3815 | |
| 3816 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3817 // Invokes JVM_OnLoad | |
| 3818 void Threads::create_vm_init_libraries() { | |
| 3819 extern struct JavaVM_ main_vm; | |
| 3820 AgentLibrary* agent; | |
| 3821 | |
| 3822 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3823 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3824 | |
| 3825 if (on_load_entry != NULL) { | |
| 3826 // Invoke the JVM_OnLoad function | |
| 3827 JavaThread* thread = JavaThread::current(); | |
| 3828 ThreadToNativeFromVM ttn(thread); | |
| 3829 HandleMark hm(thread); | |
| 3830 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3831 if (err != JNI_OK) { | |
| 3832 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3833 } | |
| 3834 } else { | |
| 3835 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3836 } | |
| 3837 } | |
| 3838 } | |
| 3839 | |
| 3840 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3841 void JavaThread::invoke_shutdown_hooks() { | |
| 3842 HandleMark hm(this); | |
| 3843 | |
| 3844 // We could get here with a pending exception, if so clear it now. | |
| 3845 if (this->has_pending_exception()) { | |
| 3846 this->clear_pending_exception(); | |
| 3847 } | |
| 3848 | |
| 3849 EXCEPTION_MARK; | |
|
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3850 Klass* k = |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
3851 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3852 THREAD); |
| 3853 if (k != NULL) { | |
| 3854 // SystemDictionary::resolve_or_null will return null if there was | |
| 3855 // an exception. If we cannot load the Shutdown class, just don't | |
| 3856 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3857 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3858 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3859 // was called, the Shutdown class would have already been loaded | |
| 3860 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3861 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3862 JavaValue result(T_VOID); | |
| 3863 JavaCalls::call_static(&result, | |
| 3864 shutdown_klass, | |
|
2177
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diff
changeset
|
3865 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3866 vmSymbols::void_method_signature(), |
| 0 | 3867 THREAD); |
| 3868 } | |
| 3869 CLEAR_PENDING_EXCEPTION; | |
| 3870 } | |
| 3871 | |
| 3872 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3873 // the program falls off the end of main(). Another VM exit path is through | |
| 3874 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3875 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3876 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3877 // and VM_Exit op at VM level. | |
| 3878 // | |
| 3879 // Shutdown sequence: | |
| 6197 | 3880 // + Shutdown native memory tracking if it is on |
| 0 | 3881 // + Wait until we are the last non-daemon thread to execute |
| 3882 // <-- every thing is still working at this moment --> | |
| 3883 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3884 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3885 // + Call before_exit(), prepare for VM exit | |
| 3886 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3887 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3888 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3889 // post thread end and vm death events to JVMTI, | |
| 3890 // stop signal thread | |
| 3891 // + Call JavaThread::exit(), it will: | |
| 3892 // > release JNI handle blocks, remove stack guard pages | |
| 3893 // > remove this thread from Threads list | |
| 3894 // <-- no more Java code from this thread after this point --> | |
| 3895 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3896 // the compiler threads at safepoint | |
| 3897 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3898 // + Disable tracing at JNI/JVM barriers | |
| 3899 // + Set _vm_exited flag for threads that are still running native code | |
| 3900 // + Delete this thread | |
| 3901 // + Call exit_globals() | |
| 3902 // > deletes tty | |
| 3903 // > deletes PerfMemory resources | |
| 3904 // + Return to caller | |
| 3905 | |
| 3906 bool Threads::destroy_vm() { | |
| 3907 JavaThread* thread = JavaThread::current(); | |
| 3908 | |
|
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|
3909 #ifdef ASSERT |
|
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|
3910 _vm_complete = false; |
|
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|
3911 #endif |
| 0 | 3912 // Wait until we are the last non-daemon thread to execute |
| 3913 { MutexLocker nu(Threads_lock); | |
| 3914 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3915 // This wait should make safepoint checks, wait without a timeout, | |
| 3916 // and wait as a suspend-equivalent condition. | |
| 3917 // | |
| 3918 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3919 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3920 // is waiting for the external suspend request on this thread to | |
| 3921 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3922 // timeout, but that takes time. Making this wait a suspend- | |
| 3923 // equivalent condition solves that timeout problem. | |
| 3924 // | |
| 3925 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3926 Mutex::_as_suspend_equivalent_flag); | |
| 3927 } | |
| 3928 | |
| 3929 // Hang forever on exit if we are reporting an error. | |
| 3930 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3931 os::infinite_sleep(); | |
| 3932 } | |
|
2302
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7022037: Pause when exiting if debugger is attached on windows
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2203
diff
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|
3933 os::wait_for_keypress_at_exit(); |
| 0 | 3934 |
| 3935 if (JDK_Version::is_jdk12x_version()) { | |
| 3936 // We are the last thread running, so check if finalizers should be run. | |
| 3937 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3938 HandleMark rm(thread); | |
| 3939 Universe::run_finalizers_on_exit(); | |
| 3940 } else { | |
| 3941 // run Java level shutdown hooks | |
| 3942 thread->invoke_shutdown_hooks(); | |
| 3943 } | |
| 3944 | |
| 3945 before_exit(thread); | |
| 3946 | |
| 3947 thread->exit(true); | |
| 3948 | |
| 3949 // Stop VM thread. | |
| 3950 { | |
| 3951 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3952 // GC vm_operations can get caught at the safepoint, and the | |
| 3953 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3954 // to prevent this. The GC vm_operations will not be able to | |
| 3955 // queue until after the vm thread is dead. | |
|
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3388
diff
changeset
|
3956 // 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
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3388
diff
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|
3957 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
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diff
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|
3958 // stopped; they remain inactive until the process exits. |
|
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3388
diff
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|
3959 // Note: some concurrent G1 threads may be running during a safepoint, |
|
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|
3960 // but these will not be accessing the heap, just some G1-specific side |
|
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|
3961 // data structures that are not accessed by any other threads but them |
|
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|
3962 // after this point in a terminal safepoint. |
|
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|
3963 |
| 0 | 3964 MutexLocker ml(Heap_lock); |
| 3965 | |
| 3966 VMThread::wait_for_vm_thread_exit(); | |
| 3967 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3968 VMThread::destroy(); | |
| 3969 } | |
| 3970 | |
| 3971 // clean up ideal graph printers | |
| 3972 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3973 IdealGraphPrinter::clean_up(); | |
| 3974 #endif | |
| 3975 | |
| 3976 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3977 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3978 // daemon threads executing native code are still running. But they | |
| 3979 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3980 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3981 | |
| 3982 #ifndef PRODUCT | |
| 3983 // disable function tracing at JNI/JVM barriers | |
| 3984 TraceJNICalls = false; | |
| 3985 TraceJVMCalls = false; | |
| 3986 TraceRuntimeCalls = false; | |
| 3987 #endif | |
| 3988 | |
| 3989 VM_Exit::set_vm_exited(); | |
| 3990 | |
| 3991 notify_vm_shutdown(); | |
| 3992 | |
| 3993 delete thread; | |
| 3994 | |
| 3995 // exit_globals() will delete tty | |
| 3996 exit_globals(); | |
| 3997 | |
| 3998 return true; | |
| 3999 } | |
| 4000 | |
| 4001 | |
| 4002 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4003 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4004 return is_supported_jni_version(version); | |
| 4005 } | |
| 4006 | |
| 4007 | |
| 4008 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4009 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4010 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4011 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
|
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|
4012 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
| 0 | 4013 return JNI_FALSE; |
| 4014 } | |
| 4015 | |
| 4016 | |
| 4017 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4018 // The threads lock must be owned at this point | |
| 4019 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4020 |
|
6e0aac35bfa9
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diff
changeset
|
4021 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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diff
changeset
|
4022 // why it is called here. |
|
6e0aac35bfa9
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diff
changeset
|
4023 p->initialize_queues(); |
| 0 | 4024 p->set_next(_thread_list); |
| 4025 _thread_list = p; | |
| 4026 _number_of_threads++; | |
| 4027 oop threadObj = p->threadObj(); | |
| 4028 bool daemon = true; | |
| 4029 // Bootstrapping problem: threadObj can be null for initial | |
| 4030 // JavaThread (or for threads attached via JNI) | |
| 4031 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4032 _number_of_non_daemon_threads++; | |
| 4033 daemon = false; | |
| 4034 } | |
| 4035 | |
| 6197 | 4036 p->set_safepoint_visible(true); |
| 4037 | |
| 0 | 4038 ThreadService::add_thread(p, daemon); |
| 4039 | |
| 4040 // Possible GC point. | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
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parents:
4800
diff
changeset
|
4041 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4042 } |
| 4043 | |
| 4044 void Threads::remove(JavaThread* p) { | |
| 4045 // Extra scope needed for Thread_lock, so we can check | |
| 4046 // that we do not remove thread without safepoint code notice | |
| 4047 { MutexLocker ml(Threads_lock); | |
| 4048 | |
| 4049 assert(includes(p), "p must be present"); | |
| 4050 | |
| 4051 JavaThread* current = _thread_list; | |
| 4052 JavaThread* prev = NULL; | |
| 4053 | |
| 4054 while (current != p) { | |
| 4055 prev = current; | |
| 4056 current = current->next(); | |
| 4057 } | |
| 4058 | |
| 4059 if (prev) { | |
| 4060 prev->set_next(current->next()); | |
| 4061 } else { | |
| 4062 _thread_list = p->next(); | |
| 4063 } | |
| 4064 _number_of_threads--; | |
| 4065 oop threadObj = p->threadObj(); | |
| 4066 bool daemon = true; | |
| 4067 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4068 _number_of_non_daemon_threads--; | |
| 4069 daemon = false; | |
| 4070 | |
| 4071 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4072 // on destroy_vm will wake up. | |
| 4073 if (number_of_non_daemon_threads() == 1) | |
| 4074 Threads_lock->notify_all(); | |
| 4075 } | |
| 4076 ThreadService::remove_thread(p, daemon); | |
| 4077 | |
| 4078 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4079 // the thread might mess around with locks after this point. This can cause it | |
| 4080 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4081 // of this thread since it is removed from the queue. | |
| 4082 p->set_terminated_value(); | |
| 6197 | 4083 |
| 4084 // Now, this thread is not visible to safepoint | |
| 4085 p->set_safepoint_visible(false); | |
|
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
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6872
diff
changeset
|
4086 // once the thread becomes safepoint invisible, we can not use its per-thread |
|
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4087 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
|
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4088 // to release its per-thread recorder here. |
|
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
4089 MemTracker::thread_exiting(p); |
| 0 | 4090 } // unlock Threads_lock |
| 4091 | |
| 4092 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
4872
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7141200: log some interesting information in ring buffers for crashes
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parents:
4800
diff
changeset
|
4093 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4094 } |
| 4095 | |
| 4096 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4097 bool Threads::includes(JavaThread* p) { | |
| 4098 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4099 ALL_JAVA_THREADS(q) { | |
| 4100 if (q == p ) { | |
| 4101 return true; | |
| 4102 } | |
| 4103 } | |
| 4104 return false; | |
| 4105 } | |
| 4106 | |
| 4107 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4108 // but the garbage collector must provide a safe context for them to run. | |
| 4109 // In particular, these things should never be called when the Threads_lock | |
| 4110 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 14309 | 4111 // uses the Threads_lock to guarantee this property. It also makes sure that |
| 0 | 4112 // all threads gets blocked when exiting or starting). |
| 4113 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4114 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4115 ALL_JAVA_THREADS(p) { |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4116 p->oops_do(f, cld_f, cf); |
| 0 | 4117 } |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4118 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
| 0 | 4119 } |
| 4120 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4121 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4122 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4123 // root groups. Overhead should be small enough to use all the time, | |
| 4124 // even in sequential code. | |
| 4125 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4126 // Cannot yet substitute active_workers for n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4127 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4128 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4129 // 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
|
4130 // is being used for parallelism elsewhere. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4131 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4132 assert(!is_par || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4133 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4134 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4135 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4136 ALL_JAVA_THREADS(p) { | |
| 4137 if (p->claim_oops_do(is_par, cp)) { | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4138 p->oops_do(f, cld_f, cf); |
| 0 | 4139 } |
| 4140 } | |
| 4141 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4142 if (vmt->claim_oops_do(is_par, cp)) { |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4143 vmt->oops_do(f, cld_f, cf); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4144 } |
| 0 | 4145 } |
| 4146 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4147 #if INCLUDE_ALL_GCS |
| 0 | 4148 // Used by ParallelScavenge |
| 4149 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4150 ALL_JAVA_THREADS(p) { | |
| 4151 q->enqueue(new ThreadRootsTask(p)); | |
| 4152 } | |
| 4153 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4154 } | |
| 4155 | |
| 4156 // Used by Parallel Old | |
| 4157 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4158 ALL_JAVA_THREADS(p) { | |
| 4159 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4160 } | |
| 4161 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4162 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4163 #endif // INCLUDE_ALL_GCS |
| 0 | 4164 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4165 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4166 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4167 p->nmethods_do(cf); |
| 0 | 4168 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4169 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4170 } |
| 4171 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4172 void Threads::metadata_do(void f(Metadata*)) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4173 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4174 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4175 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4176 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4177 |
| 0 | 4178 void Threads::gc_epilogue() { |
| 4179 ALL_JAVA_THREADS(p) { | |
| 4180 p->gc_epilogue(); | |
| 4181 } | |
| 4182 } | |
| 4183 | |
| 4184 void Threads::gc_prologue() { | |
| 4185 ALL_JAVA_THREADS(p) { | |
| 4186 p->gc_prologue(); | |
| 4187 } | |
| 4188 } | |
| 4189 | |
| 4190 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4191 ALL_JAVA_THREADS(p) { | |
| 4192 p->deoptimized_wrt_marked_nmethods(); | |
| 4193 } | |
| 4194 } | |
| 4195 | |
| 4196 | |
| 4197 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4198 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4199 address monitor, bool doLock) { | |
| 4200 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4201 "must grab Threads_lock or be at safepoint"); | |
| 4202 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4203 | |
| 4204 int i = 0; | |
| 4205 { | |
| 4206 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4207 ALL_JAVA_THREADS(p) { | |
| 4208 if (p->is_Compiler_thread()) continue; | |
| 4209 | |
| 4210 address pending = (address)p->current_pending_monitor(); | |
| 4211 if (pending == monitor) { // found a match | |
| 4212 if (i < count) result->append(p); // save the first count matches | |
| 4213 i++; | |
| 4214 } | |
| 4215 } | |
| 4216 } | |
| 4217 return result; | |
| 4218 } | |
| 4219 | |
| 4220 | |
| 4221 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4222 assert(doLock || | |
| 4223 Threads_lock->owned_by_self() || | |
| 4224 SafepointSynchronize::is_at_safepoint(), | |
| 4225 "must grab Threads_lock or be at safepoint"); | |
| 4226 | |
| 4227 // NULL owner means not locked so we can skip the search | |
| 4228 if (owner == NULL) return NULL; | |
| 4229 | |
| 4230 { | |
| 4231 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4232 ALL_JAVA_THREADS(p) { | |
| 4233 // first, see if owner is the address of a Java thread | |
| 4234 if (owner == (address)p) return p; | |
| 4235 } | |
| 4236 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4237 // Cannot assert on lack of success here since this function may be |
|
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4238 // used by code that is trying to report useful problem information |
|
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4239 // like deadlock detection. |
| 0 | 4240 if (UseHeavyMonitors) return NULL; |
| 4241 | |
| 4242 // | |
| 4243 // If we didn't find a matching Java thread and we didn't force use of | |
| 4244 // heavyweight monitors, then the owner is the stack address of the | |
| 4245 // Lock Word in the owning Java thread's stack. | |
| 4246 // | |
| 4247 JavaThread* the_owner = NULL; | |
| 4248 { | |
| 4249 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4250 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4251 if (q->is_lock_owned(owner)) { |
| 0 | 4252 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4253 break; |
| 0 | 4254 } |
| 4255 } | |
| 4256 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4257 // cannot assert on lack of success here; see above comment |
| 0 | 4258 return the_owner; |
| 4259 } | |
| 4260 | |
| 4261 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4262 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4263 char buf[32]; | |
| 4264 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4265 | |
| 4266 st->print_cr("Full thread dump %s (%s %s):", | |
| 4267 Abstract_VM_Version::vm_name(), | |
| 4268 Abstract_VM_Version::vm_release(), | |
| 4269 Abstract_VM_Version::vm_info_string() | |
| 4270 ); | |
| 4271 st->cr(); | |
| 4272 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4273 #if INCLUDE_ALL_GCS |
| 0 | 4274 // Dump concurrent locks |
| 4275 ConcurrentLocksDump concurrent_locks; | |
| 4276 if (print_concurrent_locks) { | |
| 4277 concurrent_locks.dump_at_safepoint(); | |
| 4278 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4279 #endif // INCLUDE_ALL_GCS |
| 0 | 4280 |
| 4281 ALL_JAVA_THREADS(p) { | |
| 4282 ResourceMark rm; | |
| 4283 p->print_on(st); | |
| 4284 if (print_stacks) { | |
| 4285 if (internal_format) { | |
| 4286 p->trace_stack(); | |
| 4287 } else { | |
| 4288 p->print_stack_on(st); | |
| 4289 } | |
| 4290 } | |
| 4291 st->cr(); | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4292 #if INCLUDE_ALL_GCS |
| 0 | 4293 if (print_concurrent_locks) { |
| 4294 concurrent_locks.print_locks_on(p, st); | |
| 4295 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4296 #endif // INCLUDE_ALL_GCS |
| 0 | 4297 } |
| 4298 | |
| 4299 VMThread::vm_thread()->print_on(st); | |
| 4300 st->cr(); | |
| 4301 Universe::heap()->print_gc_threads_on(st); | |
| 4302 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4303 if (wt != NULL) { |
| 4304 wt->print_on(st); | |
| 4305 st->cr(); | |
| 4306 } | |
| 0 | 4307 CompileBroker::print_compiler_threads_on(st); |
| 4308 st->flush(); | |
| 4309 } | |
| 4310 | |
| 4311 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4312 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4313 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4314 // memory (even in resource area), it might deadlock the error handler. | |
| 4315 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4316 bool found_current = false; | |
| 4317 st->print_cr("Java Threads: ( => current thread )"); | |
| 4318 ALL_JAVA_THREADS(thread) { | |
| 4319 bool is_current = (current == thread); | |
| 4320 found_current = found_current || is_current; | |
| 4321 | |
| 4322 st->print("%s", is_current ? "=>" : " "); | |
| 4323 | |
| 4324 st->print(PTR_FORMAT, thread); | |
| 4325 st->print(" "); | |
| 4326 thread->print_on_error(st, buf, buflen); | |
| 4327 st->cr(); | |
| 4328 } | |
| 4329 st->cr(); | |
| 4330 | |
| 4331 st->print_cr("Other Threads:"); | |
| 4332 if (VMThread::vm_thread()) { | |
| 4333 bool is_current = (current == VMThread::vm_thread()); | |
| 4334 found_current = found_current || is_current; | |
| 4335 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4336 | |
| 4337 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4338 st->print(" "); | |
| 4339 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4340 st->cr(); | |
| 4341 } | |
| 4342 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4343 if (wt != NULL) { | |
| 4344 bool is_current = (current == wt); | |
| 4345 found_current = found_current || is_current; | |
| 4346 st->print("%s", is_current ? "=>" : " "); | |
| 4347 | |
| 4348 st->print(PTR_FORMAT, wt); | |
| 4349 st->print(" "); | |
| 4350 wt->print_on_error(st, buf, buflen); | |
| 4351 st->cr(); | |
| 4352 } | |
| 4353 if (!found_current) { | |
| 4354 st->cr(); | |
| 4355 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4356 current->print_on_error(st, buf, buflen); | |
| 4357 st->cr(); | |
| 4358 } | |
| 4359 } | |
| 4360 | |
| 1878 | 4361 // Internal SpinLock and Mutex |
| 4362 // Based on ParkEvent | |
| 4363 | |
| 4364 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4365 // |
| 1878 | 4366 // We employ SpinLocks _only for low-contention, fixed-length |
| 4367 // short-duration critical sections where we're concerned | |
| 4368 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4369 // The mux construct provides a spin-then-block mutual exclusion | |
| 4370 // mechanism. | |
| 4371 // | |
| 4372 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4373 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4374 // for the JVM to devolve to yielding with little progress. This is true | |
| 4375 // despite the fact that the critical sections protected by ListLock are | |
| 4376 // extremely short. | |
| 0 | 4377 // |
| 1878 | 4378 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4379 // We should make this a 1st-class type, integrated into the lock | |
| 4380 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4381 // should have sufficient padding to avoid false-sharing and excessive | |
| 4382 // cache-coherency traffic. | |
| 4383 | |
| 4384 | |
| 4385 typedef volatile int SpinLockT ; | |
| 4386 | |
| 4387 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4388 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4389 return ; // normal fast-path return | |
| 4390 } | |
| 4391 | |
| 4392 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4393 TEVENT (SpinAcquire - ctx) ; | |
| 4394 int ctr = 0 ; | |
| 4395 int Yields = 0 ; | |
| 0 | 4396 for (;;) { |
| 1878 | 4397 while (*adr != 0) { |
| 4398 ++ctr ; | |
| 4399 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4400 if (Yields > 5) { | |
|
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8028280: ParkEvent leak when running modified runThese which only loads classes
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|
4401 os::naked_short_sleep(1); |
| 1878 | 4402 } else { |
| 4403 os::NakedYield() ; | |
| 4404 ++Yields ; | |
| 4405 } | |
| 4406 } else { | |
| 4407 SpinPause() ; | |
| 0 | 4408 } |
| 1878 | 4409 } |
| 4410 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4411 } |
| 4412 } | |
| 4413 | |
| 1878 | 4414 void Thread::SpinRelease (volatile int * adr) { |
| 4415 assert (*adr != 0, "invariant") ; | |
| 4416 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4417 // Roach-motel semantics. | |
| 4418 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4419 // but prior LDs and STs within the critical section can't be allowed | |
| 4420 // to reorder or float past the ST that releases the lock. | |
| 4421 *adr = 0 ; | |
| 0 | 4422 } |
| 4423 | |
| 1878 | 4424 // muxAcquire and muxRelease: |
| 4425 // | |
| 4426 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4427 // The LSB of the word is set IFF the lock is held. | |
| 4428 // The remainder of the word points to the head of a singly-linked list | |
| 4429 // of threads blocked on the lock. | |
| 4430 // | |
| 4431 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4432 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4433 // minimizing the peak number of extant ParkEvent instances then | |
| 4434 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4435 // as certain invariants were satisfied. Specifically, care would need | |
| 4436 // to be taken with regards to consuming unpark() "permits". | |
| 4437 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4438 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4439 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4440 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4441 // One way around this would be to widen the restricted-range semaphore | |
| 4442 // implemented in park(). Another alternative would be to provide | |
| 4443 // multiple instances of the PlatformEvent() for each thread. One | |
| 4444 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4445 // | |
| 4446 // * Usage: | |
| 4447 // -- Only as leaf locks | |
| 4448 // -- for short-term locking only as muxAcquire does not perform | |
| 4449 // thread state transitions. | |
| 4450 // | |
| 4451 // Alternatives: | |
| 4452 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4453 // but with parking or spin-then-park instead of pure spinning. | |
| 4454 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4455 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4456 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4457 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4458 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4459 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4460 // boundaries by using placement-new. | |
| 4461 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4462 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4463 // The validity of the backlinks must be ratified before we trust the value. | |
| 4464 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4465 // the forward links, which are always trustworthy. | |
| 4466 // * Add a successor indication. The LockWord is currently encoded as | |
| 4467 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4468 // to provide the usual futile-wakeup optimization. | |
| 4469 // See RTStt for details. | |
| 4470 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4471 // | |
| 4472 | |
| 4473 | |
| 4474 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4475 enum MuxBits { LOCKBIT = 1 } ; | |
| 4476 | |
| 4477 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4478 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4479 if (w == 0) return ; | |
| 4480 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4481 return ; | |
| 4482 } | |
| 4483 | |
| 4484 TEVENT (muxAcquire - Contention) ; | |
| 4485 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4486 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4487 for (;;) { |
| 1878 | 4488 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4489 | |
| 4490 // Optional spin phase: spin-then-park strategy | |
| 4491 while (--its >= 0) { | |
| 4492 w = *Lock ; | |
| 4493 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4494 return ; | |
| 4495 } | |
| 4496 } | |
| 4497 | |
| 4498 Self->reset() ; | |
| 4499 Self->OnList = intptr_t(Lock) ; | |
| 4500 // The following fence() isn't _strictly necessary as the subsequent | |
| 4501 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4502 OrderAccess::fence(); | |
| 4503 for (;;) { | |
| 4504 w = *Lock ; | |
| 4505 if ((w & LOCKBIT) == 0) { | |
| 4506 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4507 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4508 return ; | |
| 4509 } | |
| 4510 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4511 } |
| 1878 | 4512 assert (w & LOCKBIT, "invariant") ; |
| 4513 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4514 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4515 } | |
| 4516 | |
| 4517 while (Self->OnList != 0) { | |
| 4518 Self->park() ; | |
| 4519 } | |
| 0 | 4520 } |
| 4521 } | |
| 4522 | |
| 1878 | 4523 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4524 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4525 if (w == 0) return ; | |
| 4526 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4527 return ; | |
| 4528 } | |
| 4529 | |
| 4530 TEVENT (muxAcquire - Contention) ; | |
| 4531 ParkEvent * ReleaseAfter = NULL ; | |
| 4532 if (ev == NULL) { | |
| 4533 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4534 } | |
| 4535 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4536 for (;;) { | |
| 4537 guarantee (ev->OnList == 0, "invariant") ; | |
| 4538 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4539 | |
| 4540 // Optional spin phase: spin-then-park strategy | |
| 4541 while (--its >= 0) { | |
| 4542 w = *Lock ; | |
| 4543 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4544 if (ReleaseAfter != NULL) { | |
| 4545 ParkEvent::Release (ReleaseAfter) ; | |
| 4546 } | |
| 4547 return ; | |
| 4548 } | |
| 4549 } | |
| 4550 | |
| 4551 ev->reset() ; | |
| 4552 ev->OnList = intptr_t(Lock) ; | |
| 4553 // The following fence() isn't _strictly necessary as the subsequent | |
| 4554 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4555 OrderAccess::fence(); | |
| 4556 for (;;) { | |
| 4557 w = *Lock ; | |
| 4558 if ((w & LOCKBIT) == 0) { | |
| 4559 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4560 ev->OnList = 0 ; | |
| 4561 // We call ::Release while holding the outer lock, thus | |
| 4562 // artificially lengthening the critical section. | |
| 4563 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4564 // after we've dropped the outer lock. | |
| 4565 if (ReleaseAfter != NULL) { | |
| 4566 ParkEvent::Release (ReleaseAfter) ; | |
| 4567 } | |
| 4568 return ; | |
| 4569 } | |
| 4570 continue ; // Interference -- *Lock changed -- Just retry | |
| 4571 } | |
| 4572 assert (w & LOCKBIT, "invariant") ; | |
| 4573 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4574 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4575 } | |
| 4576 | |
| 4577 while (ev->OnList != 0) { | |
| 4578 ev->park() ; | |
| 4579 } | |
| 4580 } | |
| 4581 } | |
| 4582 | |
| 4583 // Release() must extract a successor from the list and then wake that thread. | |
| 4584 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4585 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4586 // Release() would : | |
| 4587 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4588 // (B) Extract a successor from the private list "in-hand" | |
| 4589 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4590 // If there were any newly arrived threads and the CAS() would fail. | |
| 4591 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4592 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4593 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4594 // The wakee would be responsible for reattaching and remerging before it | |
| 4595 // competed for the lock. | |
| 4596 // | |
| 4597 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4598 // multiple concurrent pushers, but only one popper or detacher. | |
| 4599 // This implementation pops from the head of the list. This is unfair, | |
| 4600 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4601 // (We wake recently run threads first). | |
| 4602 | |
| 4603 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4604 for (;;) { | |
| 4605 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4606 assert (w & LOCKBIT, "invariant") ; | |
| 4607 if (w == LOCKBIT) return ; | |
| 4608 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4609 assert (List != NULL, "invariant") ; | |
| 4610 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4611 ParkEvent * nxt = List->ListNext ; | |
| 4612 | |
| 4613 // The following CAS() releases the lock and pops the head element. | |
| 4614 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4615 continue ; | |
| 4616 } | |
| 4617 List->OnList = 0 ; | |
| 4618 OrderAccess::fence() ; | |
| 4619 List->unpark () ; | |
| 4620 return ; | |
| 4621 } | |
| 4622 } | |
| 4623 | |
| 4624 | |
| 0 | 4625 void Threads::verify() { |
| 4626 ALL_JAVA_THREADS(p) { | |
| 4627 p->verify(); | |
| 4628 } | |
| 4629 VMThread* thread = VMThread::vm_thread(); | |
| 4630 if (thread != NULL) thread->verify(); | |
| 4631 } |