Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 12205:623d923529df
8021353: Event based tracing is missing thread exit
Reviewed-by: allwin, acorn, dcubed, dholmes, egahlin
| author | mgronlun |
|---|---|
| date | Fri, 13 Sep 2013 17:47:00 +0200 |
| parents | f92b82d454fa |
| children | b89a1a870965 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7951 | 2 * Copyright (c) 1997, 2013, 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 | |
| 4006 | 115 #ifndef USDT2 |
| 0 | 116 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 117 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 118 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 119 intptr_t, intptr_t, bool); | |
| 120 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 121 intptr_t, intptr_t, bool); | |
| 122 | |
| 123 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 124 { \ | |
| 125 ResourceMark rm(this); \ | |
| 126 int len = 0; \ | |
| 127 const char* name = (javathread)->get_thread_name(); \ | |
| 128 len = strlen(name); \ | |
| 129 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 130 name, len, \ | |
| 131 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 132 (javathread)->osthread()->thread_id(), \ | |
| 133 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 134 } | |
| 135 | |
| 4006 | 136 #else /* USDT2 */ |
| 137 | |
| 138 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 139 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 140 | |
| 141 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 142 { \ | |
| 143 ResourceMark rm(this); \ | |
| 144 int len = 0; \ | |
| 145 const char* name = (javathread)->get_thread_name(); \ | |
| 146 len = strlen(name); \ | |
| 147 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 148 (char *) name, len, \ | |
| 149 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 150 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 151 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 152 } | |
| 153 | |
| 154 #endif /* USDT2 */ | |
| 155 | |
| 0 | 156 #else // ndef DTRACE_ENABLED |
| 157 | |
| 158 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 159 | |
| 160 #endif // ndef DTRACE_ENABLED | |
| 161 | |
| 6197 | 162 |
| 0 | 163 // Class hierarchy |
| 164 // - Thread | |
| 165 // - VMThread | |
| 166 // - WatcherThread | |
| 167 // - ConcurrentMarkSweepThread | |
| 168 // - JavaThread | |
| 169 // - CompilerThread | |
| 170 | |
| 171 // ======= Thread ======== | |
| 172 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 173 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 174 if (UseBiasedLocking) { |
| 175 const int alignment = markOopDesc::biased_lock_alignment; | |
| 176 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 177 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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178 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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179 AllocFailStrategy::RETURN_NULL); |
| 0 | 180 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 181 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 182 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 183 "JavaThread alignment code overflowed allocated storage"); | |
| 184 if (TraceBiasedLocking) { | |
| 185 if (aligned_addr != real_malloc_addr) | |
| 186 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 187 real_malloc_addr, aligned_addr); | |
| 188 } | |
| 189 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 190 return aligned_addr; | |
| 191 } else { | |
| 6197 | 192 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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193 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 194 } |
| 195 } | |
| 196 | |
| 197 void Thread::operator delete(void* p) { | |
| 198 if (UseBiasedLocking) { | |
| 199 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 200 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 201 } else { |
| 6197 | 202 FreeHeap(p, mtThread); |
| 0 | 203 } |
| 204 } | |
| 205 | |
| 206 | |
| 207 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 208 // JavaThread | |
| 209 | |
| 210 | |
| 211 Thread::Thread() { | |
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212 // stack and get_thread |
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213 set_stack_base(NULL); |
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214 set_stack_size(0); |
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215 set_self_raw_id(0); |
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216 set_lgrp_id(-1); |
| 0 | 217 |
| 218 // allocated data structures | |
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219 set_osthread(NULL); |
| 6197 | 220 set_resource_area(new (mtThread)ResourceArea()); |
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221 DEBUG_ONLY(_current_resource_mark = NULL;) |
| 6197 | 222 set_handle_area(new (mtThread) HandleArea(NULL)); |
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223 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
| 0 | 224 set_active_handles(NULL); |
| 225 set_free_handle_block(NULL); | |
| 226 set_last_handle_mark(NULL); | |
| 227 | |
| 228 // This initial value ==> never claimed. | |
| 229 _oops_do_parity = 0; | |
| 230 | |
| 231 // the handle mark links itself to last_handle_mark | |
| 10135 | 232 new HandleMark(this); |
| 233 | |
| 0 | 234 // plain initialization |
| 235 debug_only(_owned_locks = NULL;) | |
| 236 debug_only(_allow_allocation_count = 0;) | |
| 237 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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238 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 239 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 240 _jvmti_env_iteration_count = 0; | |
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241 set_allocated_bytes(0); |
| 0 | 242 _vm_operation_started_count = 0; |
| 243 _vm_operation_completed_count = 0; | |
| 244 _current_pending_monitor = NULL; | |
| 245 _current_pending_monitor_is_from_java = true; | |
| 246 _current_waiting_monitor = NULL; | |
| 247 _num_nested_signal = 0; | |
| 248 omFreeList = NULL ; | |
| 249 omFreeCount = 0 ; | |
| 250 omFreeProvision = 32 ; | |
| 1587 | 251 omInUseList = NULL ; |
| 252 omInUseCount = 0 ; | |
| 0 | 253 |
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254 #ifdef ASSERT |
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255 _visited_for_critical_count = false; |
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256 #endif |
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257 |
| 0 | 258 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 259 _suspend_flags = 0; | |
| 260 | |
| 261 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 262 _hashStateX = os::random() ; | |
| 263 _hashStateY = 842502087 ; | |
| 264 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 265 _hashStateW = 273326509 ; | |
| 266 | |
| 267 _OnTrap = 0 ; | |
| 268 _schedctl = NULL ; | |
| 269 _Stalled = 0 ; | |
| 270 _TypeTag = 0x2BAD ; | |
| 271 | |
| 272 // Many of the following fields are effectively final - immutable | |
| 273 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 274 // construct until the _MutexEvent is initialized ... | |
| 275 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 276 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 277 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 278 // and ::Release() | |
| 279 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 280 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 281 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 282 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 283 | |
| 284 #ifdef CHECK_UNHANDLED_OOPS | |
| 285 if (CheckUnhandledOops) { | |
| 286 _unhandled_oops = new UnhandledOops(this); | |
| 287 } | |
| 288 #endif // CHECK_UNHANDLED_OOPS | |
| 289 #ifdef ASSERT | |
| 290 if (UseBiasedLocking) { | |
| 291 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 292 assert(this == _real_malloc_address || | |
| 293 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 294 "bug in forced alignment of thread objects"); | |
| 295 } | |
| 296 #endif /* ASSERT */ | |
| 297 } | |
| 298 | |
| 299 void Thread::initialize_thread_local_storage() { | |
| 300 // Note: Make sure this method only calls | |
| 301 // non-blocking operations. Otherwise, it might not work | |
| 302 // with the thread-startup/safepoint interaction. | |
| 303 | |
| 304 // During Java thread startup, safepoint code should allow this | |
| 305 // method to complete because it may need to allocate memory to | |
| 306 // store information for the new thread. | |
| 307 | |
| 308 // initialize structure dependent on thread local storage | |
| 309 ThreadLocalStorage::set_thread(this); | |
| 310 } | |
| 311 | |
| 312 void Thread::record_stack_base_and_size() { | |
| 313 set_stack_base(os::current_stack_base()); | |
| 314 set_stack_size(os::current_stack_size()); | |
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315 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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316 // in initialize_thread(). Without the adjustment, stack size is |
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317 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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318 // So far, only Solaris has real implementation of initialize_thread(). |
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319 // |
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320 // set up any platform-specific state. |
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321 os::initialize_thread(this); |
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322 |
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323 #if INCLUDE_NMT |
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324 // record thread's native stack, stack grows downward |
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325 address stack_low_addr = stack_base() - stack_size(); |
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326 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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327 CURRENT_PC); |
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328 #endif // INCLUDE_NMT |
| 0 | 329 } |
| 330 | |
| 331 | |
| 332 Thread::~Thread() { | |
| 333 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 334 ObjectSynchronizer::omFlush (this) ; | |
| 335 | |
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336 EVENT_THREAD_DESTRUCT(this); |
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337 |
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338 // stack_base can be NULL if the thread is never started or exited before |
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339 // record_stack_base_and_size called. Although, we would like to ensure |
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340 // that all started threads do call record_stack_base_and_size(), there is |
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341 // not proper way to enforce that. |
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342 #if INCLUDE_NMT |
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343 if (_stack_base != NULL) { |
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344 address low_stack_addr = stack_base() - stack_size(); |
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345 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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346 #ifdef ASSERT |
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347 set_stack_base(NULL); |
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348 #endif |
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349 } |
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350 #endif // INCLUDE_NMT |
| 6197 | 351 |
| 0 | 352 // deallocate data structures |
| 353 delete resource_area(); | |
| 354 // since the handle marks are using the handle area, we have to deallocated the root | |
| 355 // handle mark before deallocating the thread's handle area, | |
| 356 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 10135 | 357 delete last_handle_mark(); |
| 358 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 0 | 359 |
| 360 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 361 // We NULL out the fields for good hygiene. | |
| 362 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 363 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 364 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 365 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 366 | |
| 367 delete handle_area(); | |
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368 delete metadata_handles(); |
| 0 | 369 |
| 370 // osthread() can be NULL, if creation of thread failed. | |
| 371 if (osthread() != NULL) os::free_thread(osthread()); | |
| 372 | |
| 373 delete _SR_lock; | |
| 374 | |
| 375 // clear thread local storage if the Thread is deleting itself | |
| 376 if (this == Thread::current()) { | |
| 377 ThreadLocalStorage::set_thread(NULL); | |
| 378 } else { | |
| 379 // In the case where we're not the current thread, invalidate all the | |
| 380 // caches in case some code tries to get the current thread or the | |
| 381 // thread that was destroyed, and gets stale information. | |
| 382 ThreadLocalStorage::invalidate_all(); | |
| 383 } | |
| 384 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 385 } | |
| 386 | |
| 387 // NOTE: dummy function for assertion purpose. | |
| 388 void Thread::run() { | |
| 389 ShouldNotReachHere(); | |
| 390 } | |
| 391 | |
| 392 #ifdef ASSERT | |
| 393 // Private method to check for dangling thread pointer | |
| 394 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 395 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 396 "possibility of dangling Thread pointer"); | |
| 397 } | |
| 398 #endif | |
| 399 | |
| 400 | |
| 401 #ifndef PRODUCT | |
| 402 // Tracing method for basic thread operations | |
| 403 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 404 if (!TraceThreadEvents) return; | |
| 405 ResourceMark rm; | |
| 406 ThreadCritical tc; | |
| 407 const char *name = "non-Java thread"; | |
| 408 int prio = -1; | |
| 409 if (thread->is_Java_thread() | |
| 410 && !thread->is_Compiler_thread()) { | |
| 411 // The Threads_lock must be held to get information about | |
| 412 // this thread but may not be in some situations when | |
| 413 // tracing thread events. | |
| 414 bool release_Threads_lock = false; | |
| 415 if (!Threads_lock->owned_by_self()) { | |
| 416 Threads_lock->lock(); | |
| 417 release_Threads_lock = true; | |
| 418 } | |
| 419 JavaThread* jt = (JavaThread *)thread; | |
| 420 name = (char *)jt->get_thread_name(); | |
| 421 oop thread_oop = jt->threadObj(); | |
| 422 if (thread_oop != NULL) { | |
| 423 prio = java_lang_Thread::priority(thread_oop); | |
| 424 } | |
| 425 if (release_Threads_lock) { | |
| 426 Threads_lock->unlock(); | |
| 427 } | |
| 428 } | |
| 429 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 430 } | |
| 431 #endif | |
| 432 | |
| 433 | |
| 434 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 435 trace("get priority", thread); | |
| 436 ThreadPriority priority; | |
| 437 // Can return an error! | |
| 438 (void)os::get_priority(thread, priority); | |
| 439 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 440 return priority; | |
| 441 } | |
| 442 | |
| 443 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 444 trace("set priority", thread); | |
| 445 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 446 // Can return an error! | |
| 447 (void)os::set_priority(thread, priority); | |
| 448 } | |
| 449 | |
| 450 | |
| 451 void Thread::start(Thread* thread) { | |
| 452 trace("start", thread); | |
| 453 // Start is different from resume in that its safety is guaranteed by context or | |
| 454 // being called from a Java method synchronized on the Thread object. | |
| 455 if (!DisableStartThread) { | |
| 456 if (thread->is_Java_thread()) { | |
| 457 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 458 // Can not set it after the thread started because we do not know the | |
| 459 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 460 // in SLEEPING or some other state. | |
| 461 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 462 java_lang_Thread::RUNNABLE); | |
| 463 } | |
| 464 os::start_thread(thread); | |
| 465 } | |
| 466 } | |
| 467 | |
| 468 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 469 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 470 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 471 VMThread::execute(vm_stop); | |
| 472 } | |
| 473 | |
| 474 | |
| 475 // | |
| 476 // Check if an external suspend request has completed (or has been | |
| 477 // cancelled). Returns true if the thread is externally suspended and | |
| 478 // false otherwise. | |
| 479 // | |
| 480 // The bits parameter returns information about the code path through | |
| 481 // the routine. Useful for debugging: | |
| 482 // | |
| 483 // set in is_ext_suspend_completed(): | |
| 484 // 0x00000001 - routine was entered | |
| 485 // 0x00000010 - routine return false at end | |
| 486 // 0x00000100 - thread exited (return false) | |
| 487 // 0x00000200 - suspend request cancelled (return false) | |
| 488 // 0x00000400 - thread suspended (return true) | |
| 489 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 490 // 0x00002000 - thread is native and walkable (return true) | |
| 491 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 492 // | |
| 493 // set in wait_for_ext_suspend_completion(): | |
| 494 // 0x00010000 - routine was entered | |
| 495 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 496 // 0x00040000 - thread suspended before loop (return true) | |
| 497 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 498 // 0x00100000 - thread suspended in loop (return true) | |
| 499 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 500 // | |
| 501 | |
| 502 // Helper class for tracing suspend wait debug bits. | |
| 503 // | |
| 504 // 0x00000100 indicates that the target thread exited before it could | |
| 505 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 506 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 507 // count as wait failures either. | |
| 508 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 509 | |
| 510 class TraceSuspendDebugBits : public StackObj { | |
| 511 private: | |
| 512 JavaThread * jt; | |
| 513 bool is_wait; | |
| 514 bool called_by_wait; // meaningful when !is_wait | |
| 515 uint32_t * bits; | |
| 516 | |
| 517 public: | |
| 518 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 519 uint32_t *_bits) { | |
| 520 jt = _jt; | |
| 521 is_wait = _is_wait; | |
| 522 called_by_wait = _called_by_wait; | |
| 523 bits = _bits; | |
| 524 } | |
| 525 | |
| 526 ~TraceSuspendDebugBits() { | |
| 527 if (!is_wait) { | |
| 528 #if 1 | |
| 529 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 530 // That trace is very chatty. | |
| 531 return; | |
| 532 #else | |
| 533 if (!called_by_wait) { | |
| 534 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 535 // trace calls to it from wait_for_ext_suspend_completion() | |
| 536 return; | |
| 537 } | |
| 538 #endif | |
| 539 } | |
| 540 | |
| 541 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 542 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 543 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 544 ResourceMark rm; | |
| 545 | |
| 546 tty->print_cr( | |
| 547 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 548 jt->get_thread_name(), *bits); | |
| 549 | |
| 550 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 551 } | |
| 552 } | |
| 553 } | |
| 554 }; | |
| 555 #undef DEBUG_FALSE_BITS | |
| 556 | |
| 557 | |
| 558 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 559 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 560 | |
| 561 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 562 bool do_trans_retry; // flag to force the retry | |
| 563 | |
| 564 *bits |= 0x00000001; | |
| 565 | |
| 566 do { | |
| 567 do_trans_retry = false; | |
| 568 | |
| 569 if (is_exiting()) { | |
| 570 // Thread is in the process of exiting. This is always checked | |
| 571 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 572 *bits |= 0x00000100; | |
| 573 return false; | |
| 574 } | |
| 575 | |
| 576 if (!is_external_suspend()) { | |
| 577 // Suspend request is cancelled. This is always checked before | |
| 578 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 579 // confusing the thread that made the suspend request. | |
| 580 *bits |= 0x00000200; | |
| 581 return false; | |
| 582 } | |
| 583 | |
| 584 if (is_ext_suspended()) { | |
| 585 // thread is suspended | |
| 586 *bits |= 0x00000400; | |
| 587 return true; | |
| 588 } | |
| 589 | |
| 590 // Now that we no longer do hard suspends of threads running | |
| 591 // native code, the target thread can be changing thread state | |
| 592 // while we are in this routine: | |
| 593 // | |
| 594 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 595 // | |
| 596 // We save a copy of the thread state as observed at this moment | |
| 597 // and make our decision about suspend completeness based on the | |
| 598 // copy. This closes the race where the thread state is seen as | |
| 599 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 600 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 601 JavaThreadState save_state = thread_state(); | |
| 602 | |
| 603 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 604 // If the thread's state is _thread_blocked and this blocking | |
| 605 // condition is known to be equivalent to a suspend, then we can | |
| 606 // consider the thread to be externally suspended. This means that | |
| 607 // the code that sets _thread_blocked has been modified to do | |
| 608 // self-suspension if the blocking condition releases. We also | |
| 609 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 610 // the _thread_blocked with self-suspension check. | |
| 611 // | |
| 612 // Return true since we wouldn't be here unless there was still an | |
| 613 // external suspend request. | |
| 614 *bits |= 0x00001000; | |
| 615 return true; | |
| 616 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 617 // Threads running native code will self-suspend on native==>VM/Java | |
| 618 // transitions. If its stack is walkable (should always be the case | |
| 619 // unless this function is called before the actual java_suspend() | |
| 620 // call), then the wait is done. | |
| 621 *bits |= 0x00002000; | |
| 622 return true; | |
| 623 } else if (!called_by_wait && !did_trans_retry && | |
| 624 save_state == _thread_in_native_trans && | |
| 625 frame_anchor()->walkable()) { | |
| 626 // The thread is transitioning from thread_in_native to another | |
| 627 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 628 // will force the thread to self-suspend. If it hasn't gotten | |
| 629 // there yet we may have caught the thread in-between the native | |
| 630 // code check above and the self-suspend. Lucky us. If we were | |
| 631 // called by wait_for_ext_suspend_completion(), then it | |
| 632 // will be doing the retries so we don't have to. | |
| 633 // | |
| 634 // Since we use the saved thread state in the if-statement above, | |
| 635 // there is a chance that the thread has already transitioned to | |
| 636 // _thread_blocked by the time we get here. In that case, we will | |
| 637 // make a single unnecessary pass through the logic below. This | |
| 638 // doesn't hurt anything since we still do the trans retry. | |
| 639 | |
| 640 *bits |= 0x00004000; | |
| 641 | |
| 642 // Once the thread leaves thread_in_native_trans for another | |
| 643 // thread state, we break out of this retry loop. We shouldn't | |
| 644 // need this flag to prevent us from getting back here, but | |
| 645 // sometimes paranoia is good. | |
| 646 did_trans_retry = true; | |
| 647 | |
| 648 // We wait for the thread to transition to a more usable state. | |
| 649 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 650 // We used to do an "os::yield_all(i)" call here with the intention | |
| 651 // that yielding would increase on each retry. However, the parameter | |
| 652 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 653 // on the SR_lock below provides a much more predictable scale up for | |
| 654 // the delay. It also provides a simple/direct point to check for any | |
| 655 // safepoint requests from the VMThread | |
| 656 | |
| 657 // temporarily drops SR_lock while doing wait with safepoint check | |
| 658 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 659 // and increase delay with each retry | |
| 660 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 661 | |
| 662 // check the actual thread state instead of what we saved above | |
| 663 if (thread_state() != _thread_in_native_trans) { | |
| 664 // the thread has transitioned to another thread state so | |
| 665 // try all the checks (except this one) one more time. | |
| 666 do_trans_retry = true; | |
| 667 break; | |
| 668 } | |
| 669 } // end retry loop | |
| 670 | |
| 671 | |
| 672 } | |
| 673 } while (do_trans_retry); | |
| 674 | |
| 675 *bits |= 0x00000010; | |
| 676 return false; | |
| 677 } | |
| 678 | |
| 679 // | |
| 680 // Wait for an external suspend request to complete (or be cancelled). | |
| 681 // Returns true if the thread is externally suspended and false otherwise. | |
| 682 // | |
| 683 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 684 uint32_t *bits) { | |
| 685 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 686 false /* !called_by_wait */, bits); | |
| 687 | |
| 688 // local flag copies to minimize SR_lock hold time | |
| 689 bool is_suspended; | |
| 690 bool pending; | |
| 691 uint32_t reset_bits; | |
| 692 | |
| 693 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 694 *bits |= 0x00010000; | |
| 695 | |
| 696 // We use reset_bits to reinitialize the bits value at the top of | |
| 697 // each retry loop. This allows the caller to make use of any | |
| 698 // unused bits for their own marking purposes. | |
| 699 reset_bits = *bits; | |
| 700 | |
| 701 { | |
| 702 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 703 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 704 delay, bits); | |
| 705 pending = is_external_suspend(); | |
| 706 } | |
| 707 // must release SR_lock to allow suspension to complete | |
| 708 | |
| 709 if (!pending) { | |
| 710 // A cancelled suspend request is the only false return from | |
| 711 // is_ext_suspend_completed() that keeps us from entering the | |
| 712 // retry loop. | |
| 713 *bits |= 0x00020000; | |
| 714 return false; | |
| 715 } | |
| 716 | |
| 717 if (is_suspended) { | |
| 718 *bits |= 0x00040000; | |
| 719 return true; | |
| 720 } | |
| 721 | |
| 722 for (int i = 1; i <= retries; i++) { | |
| 723 *bits = reset_bits; // reinit to only track last retry | |
| 724 | |
| 725 // We used to do an "os::yield_all(i)" call here with the intention | |
| 726 // that yielding would increase on each retry. However, the parameter | |
| 727 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 728 // on the SR_lock below provides a much more predictable scale up for | |
| 729 // the delay. It also provides a simple/direct point to check for any | |
| 730 // safepoint requests from the VMThread | |
| 731 | |
| 732 { | |
| 733 MutexLocker ml(SR_lock()); | |
| 734 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 735 // can also call this) and increase delay with each retry | |
| 736 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 737 | |
| 738 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 739 delay, bits); | |
| 740 | |
| 741 // It is possible for the external suspend request to be cancelled | |
| 742 // (by a resume) before the actual suspend operation is completed. | |
| 743 // Refresh our local copy to see if we still need to wait. | |
| 744 pending = is_external_suspend(); | |
| 745 } | |
| 746 | |
| 747 if (!pending) { | |
| 748 // A cancelled suspend request is the only false return from | |
| 749 // is_ext_suspend_completed() that keeps us from staying in the | |
| 750 // retry loop. | |
| 751 *bits |= 0x00080000; | |
| 752 return false; | |
| 753 } | |
| 754 | |
| 755 if (is_suspended) { | |
| 756 *bits |= 0x00100000; | |
| 757 return true; | |
| 758 } | |
| 759 } // end retry loop | |
| 760 | |
| 761 // thread did not suspend after all our retries | |
| 762 *bits |= 0x00200000; | |
| 763 return false; | |
| 764 } | |
| 765 | |
| 766 #ifndef PRODUCT | |
| 767 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 768 | |
| 769 // This should not need to be atomic as the only way for simultaneous | |
| 770 // updates is via interrupts. Even then this should be rare or non-existant | |
| 771 // and we don't care that much anyway. | |
| 772 | |
| 773 int index = _jmp_ring_index; | |
| 774 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 775 _jmp_ring[index]._target = (intptr_t) target; | |
| 776 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 777 _jmp_ring[index]._file = file; | |
| 778 _jmp_ring[index]._line = line; | |
| 779 } | |
| 780 #endif /* PRODUCT */ | |
| 781 | |
| 782 // Called by flat profiler | |
| 783 // Callers have already called wait_for_ext_suspend_completion | |
| 784 // The assertion for that is currently too complex to put here: | |
| 785 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 786 bool gotframe = false; | |
| 787 // self suspension saves needed state. | |
| 788 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 789 *_fr = pd_last_frame(); | |
| 790 gotframe = true; | |
| 791 } | |
| 792 return gotframe; | |
| 793 } | |
| 794 | |
| 795 void Thread::interrupt(Thread* thread) { | |
| 796 trace("interrupt", thread); | |
| 797 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 798 os::interrupt(thread); | |
| 799 } | |
| 800 | |
| 801 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 802 trace("is_interrupted", thread); | |
| 803 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 804 // Note: If clear_interrupted==false, this simply fetches and | |
| 805 // returns the value of the field osthread()->interrupted(). | |
| 806 return os::is_interrupted(thread, clear_interrupted); | |
| 807 } | |
| 808 | |
| 809 | |
| 810 // GC Support | |
| 811 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 812 jint thread_parity = _oops_do_parity; | |
| 813 if (thread_parity != strong_roots_parity) { | |
| 814 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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815 if (res == thread_parity) { |
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816 return true; |
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817 } else { |
| 0 | 818 guarantee(res == strong_roots_parity, "Or else what?"); |
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819 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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820 "Should only fail when parallel."); |
| 0 | 821 return false; |
| 822 } | |
| 823 } | |
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824 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 825 "Should only fail when parallel."); |
| 826 return false; | |
| 827 } | |
| 828 | |
|
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829 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 830 active_handles()->oops_do(f); |
| 831 // Do oop for ThreadShadow | |
| 832 f->do_oop((oop*)&_pending_exception); | |
| 833 handle_area()->oops_do(f); | |
| 834 } | |
| 835 | |
|
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836 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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837 // no nmethods in a generic thread... |
| 0 | 838 } |
| 839 | |
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840 void Thread::metadata_do(void f(Metadata*)) { |
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841 if (metadata_handles() != NULL) { |
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842 for (int i = 0; i< metadata_handles()->length(); i++) { |
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843 f(metadata_handles()->at(i)); |
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844 } |
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845 } |
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846 } |
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847 |
| 0 | 848 void Thread::print_on(outputStream* st) const { |
| 849 // get_priority assumes osthread initialized | |
| 850 if (osthread() != NULL) { | |
| 6766 | 851 int os_prio; |
| 852 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 853 st->print("os_prio=%d ", os_prio); | |
| 854 } | |
| 855 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 856 osthread()->print_on(st); |
| 857 } | |
| 858 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 859 } | |
| 860 | |
| 861 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 862 // any lock or allocate memory. | |
| 863 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 864 if (is_VM_thread()) st->print("VMThread"); | |
| 865 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 866 else if (is_Java_thread()) st->print("JavaThread"); | |
| 867 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 868 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 869 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 870 else st->print("Thread"); | |
| 871 | |
| 872 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 873 _stack_base - _stack_size, _stack_base); | |
| 874 | |
| 875 if (osthread()) { | |
| 876 st->print(" [id=%d]", osthread()->thread_id()); | |
| 877 } | |
| 878 } | |
| 879 | |
| 880 #ifdef ASSERT | |
| 881 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 882 Monitor *cur = _owned_locks; | |
| 883 if (cur == NULL) { | |
| 884 st->print(" (no locks) "); | |
| 885 } else { | |
| 886 st->print_cr(" Locks owned:"); | |
| 887 while(cur) { | |
| 888 cur->print_on(st); | |
| 889 cur = cur->next(); | |
| 890 } | |
| 891 } | |
| 892 } | |
| 893 | |
| 894 static int ref_use_count = 0; | |
| 895 | |
| 896 bool Thread::owns_locks_but_compiled_lock() const { | |
| 897 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 898 if (cur != Compile_lock) return true; | |
| 899 } | |
| 900 return false; | |
| 901 } | |
| 902 | |
| 903 | |
| 904 #endif | |
| 905 | |
| 906 #ifndef PRODUCT | |
| 907 | |
| 908 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 909 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 910 // no threads which allow_vm_block's are held | |
| 911 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 912 // Check if current thread is allowed to block at a safepoint | |
| 913 if (!(_allow_safepoint_count == 0)) | |
| 914 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 915 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 916 fatal("LEAF method calling lock?"); | |
| 917 } | |
| 918 | |
| 919 #ifdef ASSERT | |
| 920 if (potential_vm_operation && is_Java_thread() | |
| 921 && !Universe::is_bootstrapping()) { | |
| 922 // Make sure we do not hold any locks that the VM thread also uses. | |
| 923 // This could potentially lead to deadlocks | |
| 924 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 925 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 926 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 927 // since it is used to transfer control between JavaThreads and the VMThread | |
| 928 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 929 if ( (cur->allow_vm_block() && | |
| 930 cur != Threads_lock && | |
| 931 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 932 cur != VMOperationRequest_lock && | |
| 933 cur != VMOperationQueue_lock) || | |
| 934 cur->rank() == Mutex::special) { | |
| 935 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 936 } | |
| 937 } | |
| 938 } | |
| 939 | |
| 940 if (GCALotAtAllSafepoints) { | |
| 941 // We could enter a safepoint here and thus have a gc | |
| 942 InterfaceSupport::check_gc_alot(); | |
| 943 } | |
| 944 #endif | |
| 945 } | |
| 946 #endif | |
| 947 | |
| 948 bool Thread::is_in_stack(address adr) const { | |
| 949 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 950 address end = os::current_stack_pointer(); | |
|
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951 // Allow non Java threads to call this without stack_base |
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952 if (_stack_base == NULL) return true; |
| 0 | 953 if (stack_base() >= adr && adr >= end) return true; |
| 954 | |
| 955 return false; | |
| 956 } | |
| 957 | |
| 958 | |
|
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959 bool Thread::is_in_usable_stack(address adr) const { |
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960 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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961 size_t usable_stack_size = _stack_size - stack_guard_size; |
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962 |
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963 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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964 } |
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965 |
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966 |
| 0 | 967 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
| 968 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 969 // used for compilation in the future. If that change is made, the need for these methods | |
| 970 // should be revisited, and they should be removed if possible. | |
| 971 | |
| 972 bool Thread::is_lock_owned(address adr) const { | |
|
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973 return on_local_stack(adr); |
| 0 | 974 } |
| 975 | |
| 976 bool Thread::set_as_starting_thread() { | |
| 977 // NOTE: this must be called inside the main thread. | |
| 978 return os::create_main_thread((JavaThread*)this); | |
| 979 } | |
| 980 | |
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981 static void initialize_class(Symbol* class_name, TRAPS) { |
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982 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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983 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 984 } |
| 985 | |
| 986 | |
| 987 // Creates the initial ThreadGroup | |
| 988 static Handle create_initial_thread_group(TRAPS) { | |
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989 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 990 instanceKlassHandle klass (THREAD, k); |
| 991 | |
| 992 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 993 { | |
| 994 JavaValue result(T_VOID); | |
| 995 JavaCalls::call_special(&result, | |
| 996 system_instance, | |
| 997 klass, | |
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998 vmSymbols::object_initializer_name(), |
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999 vmSymbols::void_method_signature(), |
| 0 | 1000 CHECK_NH); |
| 1001 } | |
| 1002 Universe::set_system_thread_group(system_instance()); | |
| 1003 | |
| 1004 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 1005 { | |
| 1006 JavaValue result(T_VOID); | |
| 1007 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 1008 JavaCalls::call_special(&result, | |
| 1009 main_instance, | |
| 1010 klass, | |
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1011 vmSymbols::object_initializer_name(), |
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1012 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1013 system_instance, |
| 1014 string, | |
| 1015 CHECK_NH); | |
| 1016 } | |
| 1017 return main_instance; | |
| 1018 } | |
| 1019 | |
| 1020 // Creates the initial Thread | |
| 1021 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
|
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1022 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1023 instanceKlassHandle klass (THREAD, k); |
| 1024 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1025 | |
| 1026 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1027 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1028 thread->set_threadObj(thread_oop()); | |
| 1029 | |
| 1030 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1031 | |
| 1032 JavaValue result(T_VOID); | |
| 1033 JavaCalls::call_special(&result, thread_oop, | |
| 1034 klass, | |
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1035 vmSymbols::object_initializer_name(), |
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1036 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1037 thread_group, |
| 1038 string, | |
| 1039 CHECK_NULL); | |
| 1040 return thread_oop(); | |
| 1041 } | |
| 1042 | |
| 1043 static void call_initializeSystemClass(TRAPS) { | |
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1044 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1045 instanceKlassHandle klass (THREAD, k); |
| 1046 | |
| 1047 JavaValue result(T_VOID); | |
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1048 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1049 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1050 } |
| 1051 | |
| 6181 | 1052 char java_runtime_name[128] = ""; |
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1053 char java_runtime_version[128] = ""; |
| 6181 | 1054 |
| 1055 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1056 static const char* get_java_runtime_name(TRAPS) { | |
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1057 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1058 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1059 fieldDescriptor fd; | |
| 1060 bool found = k != NULL && | |
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1061 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1062 vmSymbols::string_signature(), &fd); |
| 1063 if (found) { | |
| 1064 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1065 if (name_oop == NULL) | |
| 1066 return NULL; | |
| 1067 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1068 java_runtime_name, | |
| 1069 sizeof(java_runtime_name)); | |
| 1070 return name; | |
| 1071 } else { | |
| 1072 return NULL; | |
| 1073 } | |
| 1074 } | |
| 1075 | |
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1076 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1077 static const char* get_java_runtime_version(TRAPS) { |
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1078 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1079 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1080 fieldDescriptor fd; |
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1081 bool found = k != NULL && |
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1082 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1083 vmSymbols::string_signature(), &fd); |
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1084 if (found) { |
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1085 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1086 if (name_oop == NULL) |
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1087 return NULL; |
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1088 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1089 java_runtime_version, |
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1090 sizeof(java_runtime_version)); |
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1091 return name; |
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1092 } else { |
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1093 return NULL; |
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1094 } |
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1095 } |
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1096 |
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1097 // General purpose hook into Java code, run once when the VM is initialized. |
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1098 // The Java library method itself may be changed independently from the VM. |
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1099 static void call_postVMInitHook(TRAPS) { |
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1100 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1101 instanceKlassHandle klass (THREAD, k); |
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1102 if (klass.not_null()) { |
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1103 JavaValue result(T_VOID); |
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1104 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1105 vmSymbols::void_method_signature(), |
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1106 CHECK); |
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1107 } |
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1108 } |
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1109 |
| 0 | 1110 static void reset_vm_info_property(TRAPS) { |
| 1111 // the vm info string | |
| 1112 ResourceMark rm(THREAD); | |
| 1113 const char *vm_info = VM_Version::vm_info_string(); | |
| 1114 | |
| 1115 // java.lang.System class | |
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1116 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1117 instanceKlassHandle klass (THREAD, k); |
| 1118 | |
| 1119 // setProperty arguments | |
| 1120 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1121 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1122 | |
| 1123 // return value | |
| 1124 JavaValue r(T_OBJECT); | |
| 1125 | |
| 1126 // public static String setProperty(String key, String value); | |
| 1127 JavaCalls::call_static(&r, | |
| 1128 klass, | |
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1129 vmSymbols::setProperty_name(), |
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1130 vmSymbols::string_string_string_signature(), |
| 0 | 1131 key_str, |
| 1132 value_str, | |
| 1133 CHECK); | |
| 1134 } | |
| 1135 | |
| 1136 | |
| 1137 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1138 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1139 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1140 | |
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1141 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1142 instanceKlassHandle klass (THREAD, k); |
| 1143 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1144 | |
| 1145 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1146 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1147 set_threadObj(thread_oop()); | |
| 1148 | |
| 1149 JavaValue result(T_VOID); | |
| 1150 if (thread_name != NULL) { | |
| 1151 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1152 // Thread gets assigned specified name and null target | |
| 1153 JavaCalls::call_special(&result, | |
| 1154 thread_oop, | |
| 1155 klass, | |
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1156 vmSymbols::object_initializer_name(), |
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1157 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1158 thread_group, // Argument 1 |
| 1159 name, // Argument 2 | |
| 1160 THREAD); | |
| 1161 } else { | |
| 1162 // Thread gets assigned name "Thread-nnn" and null target | |
| 1163 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1164 JavaCalls::call_special(&result, | |
| 1165 thread_oop, | |
| 1166 klass, | |
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1167 vmSymbols::object_initializer_name(), |
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1168 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1169 thread_group, // Argument 1 |
| 1170 Handle(), // Argument 2 | |
| 1171 THREAD); | |
| 1172 } | |
| 1173 | |
| 1174 | |
| 1175 if (daemon) { | |
| 1176 java_lang_Thread::set_daemon(thread_oop()); | |
| 1177 } | |
| 1178 | |
| 1179 if (HAS_PENDING_EXCEPTION) { | |
| 1180 return; | |
| 1181 } | |
| 1182 | |
| 1142 | 1183 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1184 Handle threadObj(this, this->threadObj()); |
| 1185 | |
| 1186 JavaCalls::call_special(&result, | |
| 1187 thread_group, | |
| 1188 group, | |
|
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1189 vmSymbols::add_method_name(), |
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1190 vmSymbols::thread_void_signature(), |
| 0 | 1191 threadObj, // Arg 1 |
| 1192 THREAD); | |
| 1193 | |
| 1194 | |
| 1195 } | |
| 1196 | |
| 1197 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1198 // uniquely named instances should derive from this. | |
| 1199 NamedThread::NamedThread() : Thread() { | |
| 1200 _name = NULL; | |
|
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1201 _processed_thread = NULL; |
| 0 | 1202 } |
| 1203 | |
| 1204 NamedThread::~NamedThread() { | |
| 1205 if (_name != NULL) { | |
| 6197 | 1206 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1207 _name = NULL; |
| 1208 } | |
| 1209 } | |
| 1210 | |
| 1211 void NamedThread::set_name(const char* format, ...) { | |
| 1212 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1213 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1214 guarantee(_name != NULL, "alloc failure"); |
| 1215 va_list ap; | |
| 1216 va_start(ap, format); | |
| 1217 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1218 va_end(ap); | |
| 1219 } | |
| 1220 | |
| 1221 // ======= WatcherThread ======== | |
| 1222 | |
| 1223 // The watcher thread exists to simulate timer interrupts. It should | |
| 1224 // be replaced by an abstraction over whatever native support for | |
| 1225 // timer interrupts exists on the platform. | |
| 1226 | |
| 1227 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1228 bool WatcherThread::_startable = false; |
|
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1229 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1230 |
| 11151 | 1231 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
| 0 | 1232 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
| 1233 if (os::create_thread(this, os::watcher_thread)) { | |
| 1234 _watcher_thread = this; | |
| 1235 | |
| 1236 // Set the watcher thread to the highest OS priority which should not be | |
| 1237 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1238 // is created. The only normal thread using this priority is the reference | |
| 1239 // handler thread, which runs for very short intervals only. | |
| 1240 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1241 // will be inaccurate. | |
| 1242 os::set_priority(this, MaxPriority); | |
| 1243 if (!DisableStartThread) { | |
| 1244 os::start_thread(this); | |
| 1245 } | |
| 1246 } | |
| 1247 } | |
| 1248 | |
|
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1249 int WatcherThread::sleep() const { |
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1250 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1251 |
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1252 // remaining will be zero if there are no tasks, |
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1253 // causing the WatcherThread to sleep until a task is |
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1254 // enrolled |
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1255 int remaining = PeriodicTask::time_to_wait(); |
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1256 int time_slept = 0; |
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1257 |
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1258 // we expect this to timeout - we only ever get unparked when |
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1259 // we should terminate or when a new task has been enrolled |
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1260 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1261 |
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1262 jlong time_before_loop = os::javaTimeNanos(); |
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1263 |
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1264 for (;;) { |
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1265 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1266 jlong now = os::javaTimeNanos(); |
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1267 |
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1268 if (remaining == 0) { |
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1269 // if we didn't have any tasks we could have waited for a long time |
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1270 // consider the time_slept zero and reset time_before_loop |
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1271 time_slept = 0; |
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1272 time_before_loop = now; |
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1273 } else { |
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1274 // need to recalulate since we might have new tasks in _tasks |
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1275 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1276 } |
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1277 |
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1278 // Change to task list or spurious wakeup of some kind |
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1279 if (timedout || _should_terminate) { |
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1280 break; |
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1281 } |
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1282 |
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1283 remaining = PeriodicTask::time_to_wait(); |
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1284 if (remaining == 0) { |
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1285 // Last task was just disenrolled so loop around and wait until |
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1286 // another task gets enrolled |
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1287 continue; |
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1288 } |
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1289 |
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1290 remaining -= time_slept; |
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1291 if (remaining <= 0) |
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1292 break; |
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1293 } |
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1294 |
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1295 return time_slept; |
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1296 } |
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1297 |
| 0 | 1298 void WatcherThread::run() { |
| 1299 assert(this == watcher_thread(), "just checking"); | |
| 1300 | |
| 1301 this->record_stack_base_and_size(); | |
| 1302 this->initialize_thread_local_storage(); | |
| 1303 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1304 while(!_should_terminate) { | |
| 1305 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1306 assert(watcher_thread() == this, "thread consistency check"); | |
| 1307 | |
| 1308 // Calculate how long it'll be until the next PeriodicTask work | |
| 1309 // should be done, and sleep that amount of time. | |
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1310 int time_waited = sleep(); |
| 0 | 1311 |
| 1312 if (is_error_reported()) { | |
| 1313 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1314 // should abort JVM after creating an error log file. However in some | |
| 1315 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1316 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1317 // | |
| 1318 // This code is in WatcherThread because WatcherThread wakes up | |
| 1319 // periodically so the fatal error handler doesn't need to do anything; | |
| 1320 // also because the WatcherThread is less likely to crash than other | |
| 1321 // threads. | |
| 1322 | |
| 1323 for (;;) { | |
| 1324 if (!ShowMessageBoxOnError | |
| 1325 && (OnError == NULL || OnError[0] == '\0') | |
| 1326 && Arguments::abort_hook() == NULL) { | |
| 1327 os::sleep(this, 2 * 60 * 1000, false); | |
| 1328 fdStream err(defaultStream::output_fd()); | |
| 1329 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1330 // skip atexit/vm_exit/vm_abort hooks | |
| 1331 os::die(); | |
| 1332 } | |
| 1333 | |
| 1334 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1335 // ShowMessageBoxOnError when it is ready to abort. | |
| 1336 os::sleep(this, 5 * 1000, false); | |
| 1337 } | |
| 1338 } | |
| 1339 | |
|
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1340 PeriodicTask::real_time_tick(time_waited); |
| 0 | 1341 } |
| 1342 | |
| 1343 // Signal that it is terminated | |
| 1344 { | |
| 1345 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1346 _watcher_thread = NULL; | |
| 1347 Terminator_lock->notify(); | |
| 1348 } | |
| 1349 | |
| 1350 // Thread destructor usually does this.. | |
| 1351 ThreadLocalStorage::set_thread(NULL); | |
| 1352 } | |
| 1353 | |
| 1354 void WatcherThread::start() { | |
|
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1355 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1356 |
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1357 if (watcher_thread() == NULL && _startable) { |
| 0 | 1358 _should_terminate = false; |
| 1359 // Create the single instance of WatcherThread | |
| 1360 new WatcherThread(); | |
| 1361 } | |
| 1362 } | |
| 1363 | |
|
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1364 void WatcherThread::make_startable() { |
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1365 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1366 _startable = true; |
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1367 } |
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1368 |
| 0 | 1369 void WatcherThread::stop() { |
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1370 { |
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1371 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1372 _should_terminate = true; |
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1373 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1374 |
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1375 WatcherThread* watcher = watcher_thread(); |
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1376 if (watcher != NULL) |
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1377 watcher->unpark(); |
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1378 } |
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1379 |
| 0 | 1380 // it is ok to take late safepoints here, if needed |
| 1381 MutexLocker mu(Terminator_lock); | |
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1382 |
| 0 | 1383 while(watcher_thread() != NULL) { |
| 1384 // This wait should make safepoint checks, wait without a timeout, | |
| 1385 // and wait as a suspend-equivalent condition. | |
| 1386 // | |
| 1387 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1388 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1389 // FlatProfiler task, is waiting for the external suspend request on | |
| 1390 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1391 // eventually timeout, but that takes time. Making this wait a | |
| 1392 // suspend-equivalent condition solves that timeout problem. | |
| 1393 // | |
| 1394 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1395 Mutex::_as_suspend_equivalent_flag); | |
| 1396 } | |
| 1397 } | |
| 1398 | |
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1399 void WatcherThread::unpark() { |
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1400 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1401 PeriodicTask_lock->notify(); |
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1402 } |
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1403 |
| 0 | 1404 void WatcherThread::print_on(outputStream* st) const { |
| 1405 st->print("\"%s\" ", name()); | |
| 1406 Thread::print_on(st); | |
| 1407 st->cr(); | |
| 1408 } | |
| 1409 | |
| 1410 // ======= JavaThread ======== | |
| 1411 | |
| 1412 // A JavaThread is a normal Java thread | |
| 1413 | |
| 1414 void JavaThread::initialize() { | |
| 1415 // Initialize fields | |
|
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1416 |
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1417 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1418 set_claimed_par_id(-1); |
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1419 |
| 0 | 1420 set_saved_exception_pc(NULL); |
| 1421 set_threadObj(NULL); | |
| 1422 _anchor.clear(); | |
| 1423 set_entry_point(NULL); | |
| 1424 set_jni_functions(jni_functions()); | |
| 1425 set_callee_target(NULL); | |
| 1426 set_vm_result(NULL); | |
| 1427 set_vm_result_2(NULL); | |
| 1428 set_vframe_array_head(NULL); | |
| 1429 set_vframe_array_last(NULL); | |
| 1430 set_deferred_locals(NULL); | |
| 1431 set_deopt_mark(NULL); | |
|
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1432 set_deopt_nmethod(NULL); |
| 0 | 1433 clear_must_deopt_id(); |
| 1434 set_monitor_chunks(NULL); | |
| 1435 set_next(NULL); | |
| 1436 set_thread_state(_thread_new); | |
|
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1437 #if INCLUDE_NMT |
| 6197 | 1438 set_recorder(NULL); |
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1439 #endif |
| 0 | 1440 _terminated = _not_terminated; |
| 1441 _privileged_stack_top = NULL; | |
| 1442 _array_for_gc = NULL; | |
| 1443 _suspend_equivalent = false; | |
| 1444 _in_deopt_handler = 0; | |
| 1445 _doing_unsafe_access = false; | |
| 1446 _stack_guard_state = stack_guard_unused; | |
| 1447 _exception_oop = NULL; | |
| 1448 _exception_pc = 0; | |
| 1449 _exception_handler_pc = 0; | |
| 1903 | 1450 _is_method_handle_return = 0; |
| 0 | 1451 _jvmti_thread_state= NULL; |
|
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1452 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1453 _jvmti_get_loaded_classes_closure = NULL; |
| 1454 _interp_only_mode = 0; | |
| 1455 _special_runtime_exit_condition = _no_async_condition; | |
| 1456 _pending_async_exception = NULL; | |
| 1457 _is_compiling = false; | |
| 1458 _thread_stat = NULL; | |
| 1459 _thread_stat = new ThreadStatistics(); | |
| 1460 _blocked_on_compilation = false; | |
| 1461 _jni_active_critical = 0; | |
| 1462 _do_not_unlock_if_synchronized = false; | |
| 1463 _cached_monitor_info = NULL; | |
| 1464 _parker = Parker::Allocate(this) ; | |
| 1465 | |
| 1466 #ifndef PRODUCT | |
| 1467 _jmp_ring_index = 0; | |
| 1468 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1469 record_jump(NULL, NULL, NULL, 0); | |
| 1470 } | |
| 1471 #endif /* PRODUCT */ | |
| 1472 | |
| 1473 set_thread_profiler(NULL); | |
| 1474 if (FlatProfiler::is_active()) { | |
| 1475 // This is where we would decide to either give each thread it's own profiler | |
| 1476 // or use one global one from FlatProfiler, | |
| 1477 // or up to some count of the number of profiled threads, etc. | |
| 1478 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1479 pp->engage(); | |
| 1480 set_thread_profiler(pp); | |
| 1481 } | |
| 1482 | |
| 1483 // Setup safepoint state info for this thread | |
| 1484 ThreadSafepointState::create(this); | |
| 1485 | |
| 1486 debug_only(_java_call_counter = 0); | |
| 1487 | |
| 1488 // JVMTI PopFrame support | |
| 1489 _popframe_condition = popframe_inactive; | |
| 1490 _popframe_preserved_args = NULL; | |
| 1491 _popframe_preserved_args_size = 0; | |
| 1492 | |
| 1493 pd_initialize(); | |
| 1494 } | |
| 1495 | |
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1496 #if INCLUDE_ALL_GCS |
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1497 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1498 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1499 #endif // INCLUDE_ALL_GCS |
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1500 |
| 4006 | 1501 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1502 Thread() |
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1503 #if INCLUDE_ALL_GCS |
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1504 , _satb_mark_queue(&_satb_mark_queue_set), |
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1505 _dirty_card_queue(&_dirty_card_queue_set) |
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1506 #endif // INCLUDE_ALL_GCS |
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1507 { |
| 0 | 1508 initialize(); |
| 4006 | 1509 if (is_attaching_via_jni) { |
| 1510 _jni_attach_state = _attaching_via_jni; | |
| 1511 } else { | |
| 1512 _jni_attach_state = _not_attaching_via_jni; | |
| 1513 } | |
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1514 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
| 6197 | 1515 _safepoint_visible = false; |
| 0 | 1516 } |
| 1517 | |
| 1518 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1519 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1520 return true; // Stack already guarded or guard pages not needed. | |
| 1521 } | |
| 1522 | |
| 1523 if (register_stack_overflow()) { | |
| 1524 // For those architectures which have separate register and | |
| 1525 // memory stacks, we must check the register stack to see if | |
| 1526 // it has overflowed. | |
| 1527 return false; | |
| 1528 } | |
| 1529 | |
| 1530 // Java code never executes within the yellow zone: the latter is only | |
| 1531 // there to provoke an exception during stack banging. If java code | |
| 1532 // is executing there, either StackShadowPages should be larger, or | |
| 1533 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1534 // when it should. | |
| 1535 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1536 | |
| 1537 enable_stack_yellow_zone(); | |
| 1538 return true; | |
| 1539 } | |
| 1540 | |
| 1541 bool JavaThread::reguard_stack(void) { | |
| 1542 return reguard_stack(os::current_stack_pointer()); | |
| 1543 } | |
| 1544 | |
| 1545 | |
| 1546 void JavaThread::block_if_vm_exited() { | |
| 1547 if (_terminated == _vm_exited) { | |
| 1548 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1549 // we will block here forever | |
| 1550 Threads_lock->lock_without_safepoint_check(); | |
| 1551 ShouldNotReachHere(); | |
| 1552 } | |
| 1553 } | |
| 1554 | |
| 1555 | |
| 1556 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1557 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1558 | |
|
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1559 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
|
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1560 Thread() |
|
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1561 #if INCLUDE_ALL_GCS |
|
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1562 , _satb_mark_queue(&_satb_mark_queue_set), |
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1563 _dirty_card_queue(&_dirty_card_queue_set) |
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1564 #endif // INCLUDE_ALL_GCS |
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1565 { |
| 0 | 1566 if (TraceThreadEvents) { |
| 1567 tty->print_cr("creating thread %p", this); | |
| 1568 } | |
| 1569 initialize(); | |
| 4006 | 1570 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1571 set_entry_point(entry_point); |
| 1572 // Create the native thread itself. | |
| 1573 // %note runtime_23 | |
| 1574 os::ThreadType thr_type = os::java_thread; | |
| 1575 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1576 os::java_thread; | |
| 1577 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1578 _safepoint_visible = false; |
| 0 | 1579 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1580 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1581 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1582 // the exception consists of creating the exception object & initializing it, initialization | |
| 1583 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1584 // | |
| 1585 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1586 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1587 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1588 // object must be fully initialized (take a look at JVM_Start) | |
| 1589 } | |
| 1590 | |
| 1591 JavaThread::~JavaThread() { | |
| 1592 if (TraceThreadEvents) { | |
| 1593 tty->print_cr("terminate thread %p", this); | |
| 1594 } | |
| 1595 | |
|
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1596 // By now, this thread should already be invisible to safepoint, |
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1597 // and its per-thread recorder also collected. |
| 6197 | 1598 assert(!is_safepoint_visible(), "wrong state"); |
|
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1599 #if INCLUDE_NMT |
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1600 assert(get_recorder() == NULL, "Already collected"); |
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1601 #endif // INCLUDE_NMT |
| 6197 | 1602 |
| 0 | 1603 // JSR166 -- return the parker to the free list |
| 1604 Parker::Release(_parker); | |
| 1605 _parker = NULL ; | |
| 1606 | |
| 1607 // Free any remaining previous UnrollBlock | |
| 1608 vframeArray* old_array = vframe_array_last(); | |
| 1609 | |
| 1610 if (old_array != NULL) { | |
| 1611 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1612 old_array->set_unroll_block(NULL); | |
| 1613 delete old_info; | |
| 1614 delete old_array; | |
| 1615 } | |
| 1616 | |
| 1617 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1618 if (deferred != NULL) { | |
| 1619 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1620 assert(deferred->length() != 0, "empty array!"); | |
| 1621 do { | |
| 1622 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1623 deferred->remove_at(0); | |
| 1624 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1625 delete dlv; | |
| 1626 } while (deferred->length() != 0); | |
| 1627 delete deferred; | |
| 1628 } | |
| 1629 | |
| 1630 // All Java related clean up happens in exit | |
| 1631 ThreadSafepointState::destroy(this); | |
| 1632 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1633 if (_thread_stat != NULL) delete _thread_stat; | |
| 1634 } | |
| 1635 | |
| 1636 | |
| 1637 // The first routine called by a new Java thread | |
| 1638 void JavaThread::run() { | |
| 1639 // initialize thread-local alloc buffer related fields | |
| 1640 this->initialize_tlab(); | |
| 1641 | |
| 1642 // used to test validitity of stack trace backs | |
| 1643 this->record_base_of_stack_pointer(); | |
| 1644 | |
| 1645 // Record real stack base and size. | |
| 1646 this->record_stack_base_and_size(); | |
| 1647 | |
| 1648 // Initialize thread local storage; set before calling MutexLocker | |
| 1649 this->initialize_thread_local_storage(); | |
| 1650 | |
| 1651 this->create_stack_guard_pages(); | |
| 1652 | |
|
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1653 this->cache_global_variables(); |
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1654 |
| 0 | 1655 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1656 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1657 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1658 | |
| 1659 assert(JavaThread::current() == this, "sanity check"); | |
| 1660 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1661 | |
| 1662 DTRACE_THREAD_PROBE(start, this); | |
| 1663 | |
| 1664 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1665 // been completed. | |
| 1666 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1667 | |
| 1668 if (JvmtiExport::should_post_thread_life()) { | |
| 1669 JvmtiExport::post_thread_start(this); | |
| 1670 } | |
| 1671 | |
| 10405 | 1672 EventThreadStart event; |
| 1673 if (event.should_commit()) { | |
| 1674 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1675 event.commit(); | |
| 1676 } | |
|
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1677 |
| 0 | 1678 // We call another function to do the rest so we are sure that the stack addresses used |
| 1679 // from there will be lower than the stack base just computed | |
| 1680 thread_main_inner(); | |
| 1681 | |
| 1682 // Note, thread is no longer valid at this point! | |
| 1683 } | |
| 1684 | |
| 1685 | |
| 1686 void JavaThread::thread_main_inner() { | |
| 1687 assert(JavaThread::current() == this, "sanity check"); | |
| 1688 assert(this->threadObj() != NULL, "just checking"); | |
| 1689 | |
|
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1690 // Execute thread entry point unless this thread has a pending exception |
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1691 // or has been stopped before starting. |
| 0 | 1692 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1693 if (!this->has_pending_exception() && |
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1694 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1695 { |
| 1696 ResourceMark rm(this); | |
| 1697 this->set_native_thread_name(this->get_thread_name()); | |
| 1698 } | |
| 0 | 1699 HandleMark hm(this); |
| 1700 this->entry_point()(this, this); | |
| 1701 } | |
| 1702 | |
| 1703 DTRACE_THREAD_PROBE(stop, this); | |
| 1704 | |
| 1705 this->exit(false); | |
| 1706 delete this; | |
| 1707 } | |
| 1708 | |
| 1709 | |
| 1710 static void ensure_join(JavaThread* thread) { | |
| 1711 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1712 Handle threadObj(thread, thread->threadObj()); | |
| 1713 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1714 ObjectLocker lock(threadObj, thread); | |
| 1715 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1716 thread->clear_pending_exception(); | |
| 1717 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1718 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1719 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1720 // to complete once we've done the notify_all below |
| 0 | 1721 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1722 lock.notify_all(thread); | |
| 1723 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1724 thread->clear_pending_exception(); | |
| 1725 } | |
| 1726 | |
|
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1727 |
| 0 | 1728 // For any new cleanup additions, please check to see if they need to be applied to |
| 1729 // cleanup_failed_attach_current_thread as well. | |
| 1730 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1731 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1732 | |
| 1733 HandleMark hm(this); | |
| 1734 Handle uncaught_exception(this, this->pending_exception()); | |
| 1735 this->clear_pending_exception(); | |
| 1736 Handle threadObj(this, this->threadObj()); | |
| 1737 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1738 | |
| 1739 if (get_thread_profiler() != NULL) { | |
| 1740 get_thread_profiler()->disengage(); | |
| 1741 ResourceMark rm; | |
| 1742 get_thread_profiler()->print(get_thread_name()); | |
| 1743 } | |
| 1744 | |
| 1745 | |
| 1746 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1747 { | |
| 1748 EXCEPTION_MARK; | |
| 1749 | |
| 1750 CLEAR_PENDING_EXCEPTION; | |
| 1751 } | |
| 1752 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1753 // has to be fixed by a runtime query method | |
| 1754 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1755 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1756 // java.lang.Thread.dispatchUncaughtException | |
| 1757 if (uncaught_exception.not_null()) { | |
| 1758 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1759 { | |
| 1760 EXCEPTION_MARK; | |
| 1761 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1762 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1763 // so call ThreadGroup.uncaughtException() | |
| 1764 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1765 CallInfo callinfo; | |
| 1142 | 1766 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1767 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1768 vmSymbols::dispatchUncaughtException_name(), |
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1769 vmSymbols::throwable_void_signature(), |
| 0 | 1770 KlassHandle(), false, false, THREAD); |
| 1771 CLEAR_PENDING_EXCEPTION; | |
| 1772 methodHandle method = callinfo.selected_method(); | |
| 1773 if (method.not_null()) { | |
| 1774 JavaValue result(T_VOID); | |
| 1775 JavaCalls::call_virtual(&result, | |
| 1776 threadObj, thread_klass, | |
|
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1777 vmSymbols::dispatchUncaughtException_name(), |
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1778 vmSymbols::throwable_void_signature(), |
| 0 | 1779 uncaught_exception, |
| 1780 THREAD); | |
| 1781 } else { | |
| 1142 | 1782 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1783 JavaValue result(T_VOID); |
| 1784 JavaCalls::call_virtual(&result, | |
| 1785 group, thread_group, | |
|
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1786 vmSymbols::uncaughtException_name(), |
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1787 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1788 threadObj, // Arg 1 |
| 1789 uncaught_exception, // Arg 2 | |
| 1790 THREAD); | |
| 1791 } | |
|
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1792 if (HAS_PENDING_EXCEPTION) { |
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1793 ResourceMark rm(this); |
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1794 jio_fprintf(defaultStream::error_stream(), |
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1795 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1796 " in thread \"%s\"\n", |
| 6983 | 1797 pending_exception()->klass()->external_name(), |
|
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1798 get_thread_name()); |
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1799 CLEAR_PENDING_EXCEPTION; |
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1800 } |
| 0 | 1801 } |
| 1802 } | |
| 1803 | |
|
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1804 // Called before the java thread exit since we want to read info |
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1805 // from java_lang_Thread object |
| 10405 | 1806 EventThreadEnd event; |
| 1807 if (event.should_commit()) { | |
| 1808 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
| 1809 event.commit(); | |
| 1810 } | |
|
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1811 |
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1812 // Call after last event on thread |
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|
1813 EVENT_THREAD_EXIT(this); |
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1814 |
| 0 | 1815 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1816 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1817 // is deprecated anyhow. | |
| 1818 { int count = 3; | |
| 1819 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1820 EXCEPTION_MARK; | |
| 1821 JavaValue result(T_VOID); | |
| 1142 | 1822 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1823 JavaCalls::call_virtual(&result, |
| 1824 threadObj, thread_klass, | |
|
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1825 vmSymbols::exit_method_name(), |
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1826 vmSymbols::void_method_signature(), |
| 0 | 1827 THREAD); |
| 1828 CLEAR_PENDING_EXCEPTION; | |
| 1829 } | |
| 1830 } | |
| 1831 | |
| 1832 // notify JVMTI | |
| 1833 if (JvmtiExport::should_post_thread_life()) { | |
| 1834 JvmtiExport::post_thread_end(this); | |
| 1835 } | |
| 1836 | |
| 1837 // We have notified the agents that we are exiting, before we go on, | |
| 1838 // we must check for a pending external suspend request and honor it | |
| 1839 // in order to not surprise the thread that made the suspend request. | |
| 1840 while (true) { | |
| 1841 { | |
| 1842 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1843 if (!is_external_suspend()) { | |
| 1844 set_terminated(_thread_exiting); | |
| 1845 ThreadService::current_thread_exiting(this); | |
| 1846 break; | |
| 1847 } | |
| 1848 // Implied else: | |
| 1849 // Things get a little tricky here. We have a pending external | |
| 1850 // suspend request, but we are holding the SR_lock so we | |
| 1851 // can't just self-suspend. So we temporarily drop the lock | |
| 1852 // and then self-suspend. | |
| 1853 } | |
| 1854 | |
| 1855 ThreadBlockInVM tbivm(this); | |
| 1856 java_suspend_self(); | |
| 1857 | |
| 1858 // We're done with this suspend request, but we have to loop around | |
| 1859 // and check again. Eventually we will get SR_lock without a pending | |
| 1860 // external suspend request and will be able to mark ourselves as | |
| 1861 // exiting. | |
| 1862 } | |
| 1863 // no more external suspends are allowed at this point | |
| 1864 } else { | |
| 1865 // before_exit() has already posted JVMTI THREAD_END events | |
| 1866 } | |
| 1867 | |
| 1868 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1869 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1870 // group should have the destroyed bit set before waiters are notified). | |
| 1871 ensure_join(this); | |
| 1872 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1873 | |
| 1874 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1875 // held by this thread must be released. A detach operation must only | |
| 1876 // get here if there are no Java frames on the stack. Therefore, any | |
| 1877 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1878 // pre-inflated and in the monitor cache. | |
| 1879 // | |
| 1880 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1881 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1882 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1883 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1884 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1885 } | |
| 1886 | |
| 1887 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1888 // is in a consistent state, in case GC happens | |
| 1889 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1890 | |
| 1891 if (active_handles() != NULL) { | |
| 1892 JNIHandleBlock* block = active_handles(); | |
| 1893 set_active_handles(NULL); | |
| 1894 JNIHandleBlock::release_block(block); | |
| 1895 } | |
| 1896 | |
| 1897 if (free_handle_block() != NULL) { | |
| 1898 JNIHandleBlock* block = free_handle_block(); | |
| 1899 set_free_handle_block(NULL); | |
| 1900 JNIHandleBlock::release_block(block); | |
| 1901 } | |
| 1902 | |
| 1903 // These have to be removed while this is still a valid thread. | |
| 1904 remove_stack_guard_pages(); | |
| 1905 | |
| 1906 if (UseTLAB) { | |
| 1907 tlab().make_parsable(true); // retire TLAB | |
| 1908 } | |
| 1909 | |
|
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1910 if (JvmtiEnv::environments_might_exist()) { |
|
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1911 JvmtiExport::cleanup_thread(this); |
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1912 } |
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1913 |
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1914 // We must flush any deferred card marks before removing a thread from |
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1915 // the list of active threads. |
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1916 Universe::heap()->flush_deferred_store_barrier(this); |
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1917 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1918 |
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1919 #if INCLUDE_ALL_GCS |
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1920 // We must flush the G1-related buffers before removing a thread |
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1921 // from the list of active threads. We must do this after any deferred |
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1922 // card marks have been flushed (above) so that any entries that are |
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1923 // added to the thread's dirty card queue as a result are not lost. |
|
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1924 if (UseG1GC) { |
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1925 flush_barrier_queues(); |
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1926 } |
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1927 #endif // INCLUDE_ALL_GCS |
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1928 |
| 0 | 1929 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1930 Threads::remove(this); | |
| 1931 } | |
| 1932 | |
|
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1933 #if INCLUDE_ALL_GCS |
|
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1934 // Flush G1-related queues. |
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1935 void JavaThread::flush_barrier_queues() { |
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1936 satb_mark_queue().flush(); |
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1937 dirty_card_queue().flush(); |
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1938 } |
|
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1939 |
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1940 void JavaThread::initialize_queues() { |
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1941 assert(!SafepointSynchronize::is_at_safepoint(), |
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1942 "we should not be at a safepoint"); |
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1943 |
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1944 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1945 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1946 // The SATB queue should have been constructed with its active |
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1947 // field set to false. |
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1948 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1949 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1950 // If we are creating the thread during a marking cycle, we should |
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1951 // set the active field of the SATB queue to true. |
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1952 if (satb_queue_set.is_active()) { |
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1953 satb_queue.set_active(true); |
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1954 } |
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1955 |
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1956 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1957 // The dirty card queue should have been constructed with its |
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1958 // active field set to true. |
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1959 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1960 } |
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1961 #endif // INCLUDE_ALL_GCS |
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1962 |
| 0 | 1963 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1964 if (get_thread_profiler() != NULL) { |
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1965 get_thread_profiler()->disengage(); |
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1966 ResourceMark rm; |
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1967 get_thread_profiler()->print(get_thread_name()); |
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1968 } |
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1969 |
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1970 if (active_handles() != NULL) { |
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1971 JNIHandleBlock* block = active_handles(); |
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1972 set_active_handles(NULL); |
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1973 JNIHandleBlock::release_block(block); |
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1974 } |
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1975 |
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1976 if (free_handle_block() != NULL) { |
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1977 JNIHandleBlock* block = free_handle_block(); |
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1978 set_free_handle_block(NULL); |
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1979 JNIHandleBlock::release_block(block); |
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1980 } |
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1981 |
|
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1982 // These have to be removed while this is still a valid thread. |
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1983 remove_stack_guard_pages(); |
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1984 |
|
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1985 if (UseTLAB) { |
|
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1986 tlab().make_parsable(true); // retire TLAB, if any |
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1987 } |
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1988 |
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1989 #if INCLUDE_ALL_GCS |
|
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1990 if (UseG1GC) { |
|
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1991 flush_barrier_queues(); |
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1992 } |
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1993 #endif // INCLUDE_ALL_GCS |
|
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1994 |
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1995 Threads::remove(this); |
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1996 delete this; |
| 0 | 1997 } |
| 1998 | |
| 1999 | |
|
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2000 |
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2001 |
| 0 | 2002 JavaThread* JavaThread::active() { |
| 2003 Thread* thread = ThreadLocalStorage::thread(); | |
| 2004 assert(thread != NULL, "just checking"); | |
| 2005 if (thread->is_Java_thread()) { | |
| 2006 return (JavaThread*) thread; | |
| 2007 } else { | |
| 2008 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 2009 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 2010 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 2011 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 2012 return ret; | |
| 2013 } | |
| 2014 } | |
| 2015 | |
| 2016 bool JavaThread::is_lock_owned(address adr) const { | |
|
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2017 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 2018 |
| 2019 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2020 if (chunk->contains(adr)) return true; | |
| 2021 } | |
| 2022 | |
| 2023 return false; | |
| 2024 } | |
| 2025 | |
| 2026 | |
| 2027 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 2028 chunk->set_next(monitor_chunks()); | |
| 2029 set_monitor_chunks(chunk); | |
| 2030 } | |
| 2031 | |
| 2032 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 2033 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 2034 if (monitor_chunks() == chunk) { | |
| 2035 set_monitor_chunks(chunk->next()); | |
| 2036 } else { | |
| 2037 MonitorChunk* prev = monitor_chunks(); | |
| 2038 while (prev->next() != chunk) prev = prev->next(); | |
| 2039 prev->set_next(chunk->next()); | |
| 2040 } | |
| 2041 } | |
| 2042 | |
| 2043 // JVM support. | |
| 2044 | |
| 2045 // Note: this function shouldn't block if it's called in | |
| 2046 // _thread_in_native_trans state (such as from | |
| 2047 // check_special_condition_for_native_trans()). | |
| 2048 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 2049 | |
| 2050 if (has_last_Java_frame() && has_async_condition()) { | |
| 2051 // If we are at a polling page safepoint (not a poll return) | |
| 2052 // then we must defer async exception because live registers | |
| 2053 // will be clobbered by the exception path. Poll return is | |
| 2054 // ok because the call we a returning from already collides | |
| 2055 // with exception handling registers and so there is no issue. | |
| 2056 // (The exception handling path kills call result registers but | |
| 2057 // this is ok since the exception kills the result anyway). | |
| 2058 | |
| 2059 if (is_at_poll_safepoint()) { | |
| 2060 // if the code we are returning to has deoptimized we must defer | |
| 2061 // the exception otherwise live registers get clobbered on the | |
| 2062 // exception path before deoptimization is able to retrieve them. | |
| 2063 // | |
| 2064 RegisterMap map(this, false); | |
| 2065 frame caller_fr = last_frame().sender(&map); | |
| 2066 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 2067 if (caller_fr.is_deoptimized_frame()) { | |
| 2068 if (TraceExceptions) { | |
| 2069 ResourceMark rm; | |
| 2070 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 2071 } | |
| 2072 return; | |
| 2073 } | |
| 2074 } | |
| 2075 } | |
| 2076 | |
| 2077 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 2078 if (condition == _no_async_condition) { | |
| 2079 // Conditions have changed since has_special_runtime_exit_condition() | |
| 2080 // was called: | |
| 2081 // - if we were here only because of an external suspend request, | |
| 2082 // then that was taken care of above (or cancelled) so we are done | |
| 2083 // - if we were here because of another async request, then it has | |
| 2084 // been cleared between the has_special_runtime_exit_condition() | |
| 2085 // and now so again we are done | |
| 2086 return; | |
| 2087 } | |
| 2088 | |
| 2089 // Check for pending async. exception | |
| 2090 if (_pending_async_exception != NULL) { | |
| 2091 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2092 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2093 |
| 2094 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2095 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2096 | |
| 2097 if (TraceExceptions) { | |
| 2098 ResourceMark rm; | |
| 2099 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2100 if (has_last_Java_frame() ) { | |
| 2101 frame f = last_frame(); | |
| 2102 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2103 } | |
|
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2104 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2105 } |
| 2106 _pending_async_exception = NULL; | |
| 2107 clear_has_async_exception(); | |
| 2108 } | |
| 2109 } | |
| 2110 | |
| 2111 if (check_unsafe_error && | |
| 2112 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2113 condition = _no_async_condition; // done | |
| 2114 switch (thread_state()) { | |
| 2115 case _thread_in_vm: | |
| 2116 { | |
| 2117 JavaThread* THREAD = this; | |
| 2118 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2119 } | |
| 2120 case _thread_in_native: | |
| 2121 { | |
| 2122 ThreadInVMfromNative tiv(this); | |
| 2123 JavaThread* THREAD = this; | |
| 2124 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2125 } | |
| 2126 case _thread_in_Java: | |
| 2127 { | |
| 2128 ThreadInVMfromJava tiv(this); | |
| 2129 JavaThread* THREAD = this; | |
| 2130 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2131 } | |
| 2132 default: | |
| 2133 ShouldNotReachHere(); | |
| 2134 } | |
| 2135 } | |
| 2136 | |
| 2137 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2138 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2139 "must have handled the async condition, if no exception"); | |
| 2140 } | |
| 2141 | |
| 2142 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2143 // | |
| 2144 // Check for pending external suspend. Internal suspend requests do | |
| 2145 // not use handle_special_runtime_exit_condition(). | |
| 2146 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2147 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2148 // threads could call into the VM with another thread's JNIEnv so we | |
| 2149 // can be here operating on behalf of a suspended thread (4432884). | |
| 2150 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2151 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2152 // | |
| 2153 // Because thread is external suspended the safepoint code will count | |
| 2154 // thread as at a safepoint. This can be odd because we can be here | |
| 2155 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2156 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2157 // before calling java_suspend_self like all other callers of it but | |
| 2158 // we must then observe proper safepoint protocol. (We can't leave | |
| 2159 // _thread_blocked with a safepoint in progress). However we can be | |
| 2160 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2161 // constructor/destructor pair because they assert on that type of | |
| 2162 // transition. We could do something like: | |
| 2163 // | |
| 2164 // JavaThreadState state = thread_state(); | |
| 2165 // set_thread_state(_thread_in_vm); | |
| 2166 // { | |
| 2167 // ThreadBlockInVM tbivm(this); | |
| 2168 // java_suspend_self() | |
| 2169 // } | |
| 2170 // set_thread_state(_thread_in_vm_trans); | |
| 2171 // if (safepoint) block; | |
| 2172 // set_thread_state(state); | |
| 2173 // | |
| 2174 // but that is pretty messy. Instead we just go with the way the | |
| 2175 // code has worked before and note that this is the only path to | |
| 2176 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2177 // mode. | |
| 2178 | |
| 2179 frame_anchor()->make_walkable(this); | |
| 2180 java_suspend_self(); | |
| 2181 | |
| 2182 // We might be here for reasons in addition to the self-suspend request | |
| 2183 // so check for other async requests. | |
| 2184 } | |
| 2185 | |
| 2186 if (check_asyncs) { | |
| 2187 check_and_handle_async_exceptions(); | |
| 2188 } | |
| 2189 } | |
| 2190 | |
| 2191 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2192 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2193 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2194 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2195 | |
| 2196 // Do not throw asynchronous exceptions against the compiler thread | |
| 2197 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2198 if (is_Compiler_thread()) return; | |
| 2199 | |
| 2200 { | |
| 2201 // Actually throw the Throwable against the target Thread - however | |
| 2202 // only if there is no thread death exception installed already. | |
| 1142 | 2203 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2204 // If the topmost frame is a runtime stub, then we are calling into |
| 2205 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2206 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2207 // may not be valid | |
| 2208 if (has_last_Java_frame()) { | |
| 2209 frame f = last_frame(); | |
| 2210 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2211 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2212 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2213 frame compiled_frame = f.sender(®_map); | |
|
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2214 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
| 0 | 2215 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
| 2216 } | |
| 2217 } | |
| 2218 } | |
| 2219 | |
| 2220 // Set async. pending exception in thread. | |
| 2221 set_pending_async_exception(java_throwable); | |
| 2222 | |
| 2223 if (TraceExceptions) { | |
| 2224 ResourceMark rm; | |
|
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2225 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2226 } |
| 2227 // for AbortVMOnException flag | |
|
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2228 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2229 } |
| 2230 } | |
| 2231 | |
| 2232 | |
| 2233 // Interrupt thread so it will wake up from a potential wait() | |
| 2234 Thread::interrupt(this); | |
| 2235 } | |
| 2236 | |
| 2237 // External suspension mechanism. | |
| 2238 // | |
| 2239 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2240 // to any VM_locks and it is at a transition | |
| 2241 // Self-suspension will happen on the transition out of the vm. | |
| 2242 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2243 // | |
| 2244 // Guarantees on return: | |
| 2245 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2246 // force a safepoint) | |
| 2247 // + Target thread will not enter any new monitors | |
| 2248 // | |
| 2249 void JavaThread::java_suspend() { | |
| 2250 { MutexLocker mu(Threads_lock); | |
| 2251 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2252 return; | |
| 2253 } | |
| 2254 } | |
| 2255 | |
| 2256 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2257 if (!is_external_suspend()) { | |
| 2258 // a racing resume has cancelled us; bail out now | |
| 2259 return; | |
| 2260 } | |
| 2261 | |
| 2262 // suspend is done | |
| 2263 uint32_t debug_bits = 0; | |
| 2264 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2265 // SR_lock to allow the thread to reach a stable thread state if | |
| 2266 // it is currently in a transient thread state. | |
| 2267 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2268 SuspendRetryDelay, &debug_bits) ) { | |
| 2269 return; | |
| 2270 } | |
| 2271 } | |
| 2272 | |
| 2273 VM_ForceSafepoint vm_suspend; | |
| 2274 VMThread::execute(&vm_suspend); | |
| 2275 } | |
| 2276 | |
| 2277 // Part II of external suspension. | |
| 2278 // A JavaThread self suspends when it detects a pending external suspend | |
| 2279 // request. This is usually on transitions. It is also done in places | |
| 2280 // where continuing to the next transition would surprise the caller, | |
| 2281 // e.g., monitor entry. | |
| 2282 // | |
| 2283 // Returns the number of times that the thread self-suspended. | |
| 2284 // | |
| 2285 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2286 // thread. java_suspend_self() is the second stage of cooperative | |
| 2287 // suspension for external suspend requests and should only be used | |
| 2288 // to complete an external suspend request. | |
| 2289 // | |
| 2290 int JavaThread::java_suspend_self() { | |
| 2291 int ret = 0; | |
| 2292 | |
| 2293 // we are in the process of exiting so don't suspend | |
| 2294 if (is_exiting()) { | |
| 2295 clear_external_suspend(); | |
| 2296 return ret; | |
| 2297 } | |
| 2298 | |
| 2299 assert(_anchor.walkable() || | |
| 2300 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2301 "must have walkable stack"); | |
| 2302 | |
| 2303 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2304 | |
| 979 | 2305 assert(!this->is_ext_suspended(), |
| 0 | 2306 "a thread trying to self-suspend should not already be suspended"); |
| 2307 | |
| 2308 if (this->is_suspend_equivalent()) { | |
| 2309 // If we are self-suspending as a result of the lifting of a | |
| 2310 // suspend equivalent condition, then the suspend_equivalent | |
| 2311 // flag is not cleared until we set the ext_suspended flag so | |
| 2312 // that wait_for_ext_suspend_completion() returns consistent | |
| 2313 // results. | |
| 2314 this->clear_suspend_equivalent(); | |
| 2315 } | |
| 2316 | |
| 2317 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2318 // above. Or another external suspend request could be waiting for us | |
| 2319 // by the time we return from SR_lock()->wait(). The thread | |
| 2320 // that requested the suspension may already be trying to walk our | |
| 2321 // stack and if we return now, we can change the stack out from under | |
| 2322 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2323 // to crash. We stay self-suspended until there are no more pending | |
| 2324 // external suspend requests. | |
| 2325 while (is_external_suspend()) { | |
| 2326 ret++; | |
| 2327 this->set_ext_suspended(); | |
| 2328 | |
| 2329 // _ext_suspended flag is cleared by java_resume() | |
| 2330 while (is_ext_suspended()) { | |
| 2331 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2332 } | |
| 2333 } | |
| 2334 | |
| 2335 return ret; | |
| 2336 } | |
| 2337 | |
| 2338 #ifdef ASSERT | |
| 2339 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2340 // hence doesn't need protection from concurrent access at this stage | |
| 2341 void JavaThread::verify_not_published() { | |
| 2342 if (!Threads_lock->owned_by_self()) { | |
| 2343 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2344 assert( !Threads::includes(this), | |
| 2345 "java thread shouldn't have been published yet!"); | |
| 2346 } | |
| 2347 else { | |
| 2348 assert( !Threads::includes(this), | |
| 2349 "java thread shouldn't have been published yet!"); | |
| 2350 } | |
| 2351 } | |
| 2352 #endif | |
| 2353 | |
| 2354 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2355 // progress or when _suspend_flags is non-zero. | |
| 2356 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2357 // block if a safepoint is in progress. | |
| 2358 // Async exception ISN'T checked. | |
| 2359 // Note only the ThreadInVMfromNative transition can call this function | |
| 2360 // directly and when thread state is _thread_in_native_trans | |
| 2361 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2362 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2363 | |
| 2364 JavaThread *curJT = JavaThread::current(); | |
| 2365 bool do_self_suspend = thread->is_external_suspend(); | |
| 2366 | |
| 2367 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2368 | |
| 2369 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2370 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2371 // threads could call into the VM with another thread's JNIEnv so we | |
| 2372 // can be here operating on behalf of a suspended thread (4432884). | |
| 2373 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2374 JavaThreadState state = thread->thread_state(); | |
| 2375 | |
| 2376 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2377 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2378 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2379 thread->set_suspend_equivalent(); | |
| 2380 | |
| 2381 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2382 // wait until the thread changes to other thread state. There is no | |
| 2383 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2384 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2385 // too long. Temporarily change the state to _thread_blocked to | |
| 2386 // let the VM thread know that this thread is ready for GC. The problem | |
| 2387 // of changing thread state is that safepoint could happen just after | |
| 2388 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2389 // see the _thread_blocked state. We must check for safepoint | |
| 2390 // after restoring the state and make sure we won't leave while a safepoint | |
| 2391 // is in progress. | |
| 2392 thread->set_thread_state(_thread_blocked); | |
| 2393 thread->java_suspend_self(); | |
| 2394 thread->set_thread_state(state); | |
| 2395 // Make sure new state is seen by VM thread | |
| 2396 if (os::is_MP()) { | |
| 2397 if (UseMembar) { | |
| 2398 // Force a fence between the write above and read below | |
| 2399 OrderAccess::fence(); | |
| 2400 } else { | |
| 2401 // Must use this rather than serialization page in particular on Windows | |
| 2402 InterfaceSupport::serialize_memory(thread); | |
| 2403 } | |
| 2404 } | |
| 2405 } | |
| 2406 | |
| 2407 if (SafepointSynchronize::do_call_back()) { | |
| 2408 // If we are safepointing, then block the caller which may not be | |
| 2409 // the same as the target thread (see above). | |
| 2410 SafepointSynchronize::block(curJT); | |
| 2411 } | |
| 2412 | |
| 2413 if (thread->is_deopt_suspend()) { | |
| 2414 thread->clear_deopt_suspend(); | |
| 2415 RegisterMap map(thread, false); | |
| 2416 frame f = thread->last_frame(); | |
| 2417 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2418 f = f.sender(&map); | |
| 2419 } | |
| 2420 if (f.id() == thread->must_deopt_id()) { | |
| 2421 thread->clear_must_deopt_id(); | |
|
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2422 f.deoptimize(thread); |
| 0 | 2423 } else { |
| 2424 fatal("missed deoptimization!"); | |
| 2425 } | |
| 2426 } | |
| 2427 } | |
| 2428 | |
| 2429 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2430 // progress or when _suspend_flags is non-zero. | |
| 2431 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2432 // block if a safepoint is in progress. | |
| 2433 // Also check for pending async exception (not including unsafe access error). | |
| 2434 // Note only the native==>VM/Java barriers can call this function and when | |
| 2435 // thread state is _thread_in_native_trans. | |
| 2436 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2437 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2438 | |
| 2439 if (thread->has_async_exception()) { | |
| 2440 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2441 // access error since that may block. | |
| 2442 thread->check_and_handle_async_exceptions(false); | |
| 2443 } | |
| 2444 } | |
| 2445 | |
|
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2446 // This is a variant of the normal |
|
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2447 // check_special_condition_for_native_trans with slightly different |
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2448 // semantics for use by critical native wrappers. It does all the |
|
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2449 // normal checks but also performs the transition back into |
|
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2450 // thread_in_Java state. This is required so that critical natives |
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2451 // can potentially block and perform a GC if they are the last thread |
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2452 // exiting the GC_locker. |
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2453 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
|
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2454 check_special_condition_for_native_trans(thread); |
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2455 |
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2456 // Finish the transition |
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2457 thread->set_thread_state(_thread_in_Java); |
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2458 |
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2459 if (thread->do_critical_native_unlock()) { |
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2460 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2461 GC_locker::unlock_critical(thread); |
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2462 thread->clear_critical_native_unlock(); |
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2463 } |
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2464 } |
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2465 |
| 0 | 2466 // We need to guarantee the Threads_lock here, since resumes are not |
| 2467 // allowed during safepoint synchronization | |
| 2468 // Can only resume from an external suspension | |
| 2469 void JavaThread::java_resume() { | |
| 2470 assert_locked_or_safepoint(Threads_lock); | |
| 2471 | |
| 2472 // Sanity check: thread is gone, has started exiting or the thread | |
| 2473 // was not externally suspended. | |
| 2474 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2475 return; | |
| 2476 } | |
| 2477 | |
| 2478 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2479 | |
| 2480 clear_external_suspend(); | |
| 2481 | |
| 2482 if (is_ext_suspended()) { | |
| 2483 clear_ext_suspended(); | |
| 2484 SR_lock()->notify_all(); | |
| 2485 } | |
| 2486 } | |
| 2487 | |
| 2488 void JavaThread::create_stack_guard_pages() { | |
| 2489 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2490 address low_addr = stack_base() - stack_size(); | |
| 2491 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2492 | |
| 2493 int allocate = os::allocate_stack_guard_pages(); | |
| 2494 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2495 | |
|
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2496 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2497 warning("Attempt to allocate stack guard pages failed."); |
| 2498 return; | |
| 2499 } | |
| 2500 | |
| 2501 if (os::guard_memory((char *) low_addr, len)) { | |
| 2502 _stack_guard_state = stack_guard_enabled; | |
| 2503 } else { | |
| 2504 warning("Attempt to protect stack guard pages failed."); | |
| 2505 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2506 warning("Attempt to deallocate stack guard pages failed."); | |
| 2507 } | |
| 2508 } | |
| 2509 } | |
| 2510 | |
| 2511 void JavaThread::remove_stack_guard_pages() { | |
|
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2512 assert(Thread::current() == this, "from different thread"); |
| 0 | 2513 if (_stack_guard_state == stack_guard_unused) return; |
| 2514 address low_addr = stack_base() - stack_size(); | |
| 2515 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2516 | |
| 2517 if (os::allocate_stack_guard_pages()) { | |
|
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2518 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2519 _stack_guard_state = stack_guard_unused; |
| 2520 } else { | |
| 2521 warning("Attempt to deallocate stack guard pages failed."); | |
| 2522 } | |
| 2523 } else { | |
| 2524 if (_stack_guard_state == stack_guard_unused) return; | |
| 2525 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2526 _stack_guard_state = stack_guard_unused; | |
| 2527 } else { | |
| 2528 warning("Attempt to unprotect stack guard pages failed."); | |
| 2529 } | |
| 2530 } | |
| 2531 } | |
| 2532 | |
| 2533 void JavaThread::enable_stack_yellow_zone() { | |
| 2534 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2535 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2536 | |
| 2537 // The base notation is from the stacks point of view, growing downward. | |
| 2538 // We need to adjust it to work correctly with guard_memory() | |
| 2539 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2540 | |
| 2541 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2542 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2543 | |
| 2544 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2545 _stack_guard_state = stack_guard_enabled; | |
| 2546 } else { | |
| 2547 warning("Attempt to guard stack yellow zone failed."); | |
| 2548 } | |
| 2549 enable_register_stack_guard(); | |
| 2550 } | |
| 2551 | |
| 2552 void JavaThread::disable_stack_yellow_zone() { | |
| 2553 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2554 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2555 | |
| 2556 // Simply return if called for a thread that does not use guard pages. | |
| 2557 if (_stack_guard_state == stack_guard_unused) return; | |
| 2558 | |
| 2559 // The base notation is from the stacks point of view, growing downward. | |
| 2560 // We need to adjust it to work correctly with guard_memory() | |
| 2561 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2562 | |
| 2563 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2564 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2565 } else { | |
| 2566 warning("Attempt to unguard stack yellow zone failed."); | |
| 2567 } | |
| 2568 disable_register_stack_guard(); | |
| 2569 } | |
| 2570 | |
| 2571 void JavaThread::enable_stack_red_zone() { | |
| 2572 // The base notation is from the stacks point of view, growing downward. | |
| 2573 // We need to adjust it to work correctly with guard_memory() | |
| 2574 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2575 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2576 | |
| 2577 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2578 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2579 | |
| 2580 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2581 warning("Attempt to guard stack red zone failed."); | |
| 2582 } | |
| 2583 } | |
| 2584 | |
| 2585 void JavaThread::disable_stack_red_zone() { | |
| 2586 // The base notation is from the stacks point of view, growing downward. | |
| 2587 // We need to adjust it to work correctly with guard_memory() | |
| 2588 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2589 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2590 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2591 warning("Attempt to unguard stack red zone failed."); | |
| 2592 } | |
| 2593 } | |
| 2594 | |
| 2595 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2596 // ignore is there is no stack | |
| 2597 if (!has_last_Java_frame()) return; | |
| 2598 // traverse the stack frames. Starts from top frame. | |
| 2599 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2600 frame* fr = fst.current(); | |
| 2601 f(fr, fst.register_map()); | |
| 2602 } | |
| 2603 } | |
| 2604 | |
| 2605 | |
| 2606 #ifndef PRODUCT | |
| 2607 // Deoptimization | |
| 2608 // Function for testing deoptimization | |
| 2609 void JavaThread::deoptimize() { | |
| 2610 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2611 StackFrameStream fst(this, UseBiasedLocking); | |
| 2612 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2613 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2614 // Iterate over all frames in the thread and deoptimize | |
| 2615 for(; !fst.is_done(); fst.next()) { | |
| 2616 if(fst.current()->can_be_deoptimized()) { | |
| 2617 | |
| 2618 if (only_at) { | |
| 2619 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2620 // consists of comma or carriage return separated numbers so | |
| 2621 // search for the current bci in that string. | |
| 2622 address pc = fst.current()->pc(); | |
| 2623 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2624 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2625 char buffer[8]; | |
| 2626 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2627 size_t len = strlen(buffer); | |
| 2628 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2629 while (found != NULL) { | |
| 2630 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2631 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2632 // Check that the bci found is bracketed by terminators. | |
| 2633 break; | |
| 2634 } | |
| 2635 found = strstr(found + 1, buffer); | |
| 2636 } | |
| 2637 if (!found) { | |
| 2638 continue; | |
| 2639 } | |
| 2640 } | |
| 2641 | |
| 2642 if (DebugDeoptimization && !deopt) { | |
| 2643 deopt = true; // One-time only print before deopt | |
| 2644 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2645 trace_frames(); | |
| 2646 trace_stack(); | |
| 2647 } | |
| 2648 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2649 } | |
| 2650 } | |
| 2651 | |
| 2652 if (DebugDeoptimization && deopt) { | |
| 2653 tty->print_cr("[AFTER Deoptimization]"); | |
| 2654 trace_frames(); | |
| 2655 } | |
| 2656 } | |
| 2657 | |
| 2658 | |
| 2659 // Make zombies | |
| 2660 void JavaThread::make_zombies() { | |
| 2661 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2662 if (fst.current()->can_be_deoptimized()) { | |
| 2663 // it is a Java nmethod | |
| 2664 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2665 nm->make_not_entrant(); | |
| 2666 } | |
| 2667 } | |
| 2668 } | |
| 2669 #endif // PRODUCT | |
| 2670 | |
| 2671 | |
| 2672 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2673 if (!has_last_Java_frame()) return; | |
| 2674 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2675 StackFrameStream fst(this, UseBiasedLocking); | |
| 2676 for(; !fst.is_done(); fst.next()) { | |
| 2677 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2678 if (LogCompilation && xtty != NULL) { |
| 2679 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2680 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2681 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2682 } | |
| 2683 | |
| 0 | 2684 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2685 } | |
| 2686 } | |
| 2687 } | |
| 2688 | |
| 2689 | |
| 2690 // GC support | |
| 2691 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2692 | |
| 2693 void JavaThread::gc_epilogue() { | |
| 2694 frames_do(frame_gc_epilogue); | |
| 2695 } | |
| 2696 | |
| 2697 | |
| 2698 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2699 | |
| 2700 void JavaThread::gc_prologue() { | |
| 2701 frames_do(frame_gc_prologue); | |
| 2702 } | |
| 2703 | |
|
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2704 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2705 // the given JavaThread in its _processed_thread field. |
|
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2706 class RememberProcessedThread: public StackObj { |
|
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2707 NamedThread* _cur_thr; |
|
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2708 public: |
|
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2709 RememberProcessedThread(JavaThread* jthr) { |
|
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2710 Thread* thread = Thread::current(); |
|
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2711 if (thread->is_Named_thread()) { |
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2712 _cur_thr = (NamedThread *)thread; |
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2713 _cur_thr->set_processed_thread(jthr); |
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2714 } else { |
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2715 _cur_thr = NULL; |
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2716 } |
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2717 } |
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2718 |
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2719 ~RememberProcessedThread() { |
|
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2720 if (_cur_thr) { |
|
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2721 _cur_thr->set_processed_thread(NULL); |
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2722 } |
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2723 } |
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2724 }; |
| 0 | 2725 |
|
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2726 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 1166 | 2727 // Verify that the deferred card marks have been flushed. |
| 2728 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2729 |
| 0 | 2730 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2731 // since there may be more than one thread using each ThreadProfiler. | |
| 2732 | |
| 2733 // Traverse the GCHandles | |
|
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2734 Thread::oops_do(f, cld_f, cf); |
| 0 | 2735 |
| 2736 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2737 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2738 | |
| 2739 if (has_last_Java_frame()) { | |
|
1119
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2740 // Record JavaThread to GC thread |
|
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|
2741 RememberProcessedThread rpt(this); |
| 0 | 2742 |
| 2743 // Traverse the privileged stack | |
| 2744 if (_privileged_stack_top != NULL) { | |
| 2745 _privileged_stack_top->oops_do(f); | |
| 2746 } | |
| 2747 | |
| 2748 // traverse the registered growable array | |
| 2749 if (_array_for_gc != NULL) { | |
| 2750 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2751 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2752 } | |
| 2753 } | |
| 2754 | |
| 2755 // Traverse the monitor chunks | |
| 2756 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2757 chunk->oops_do(f); | |
| 2758 } | |
| 2759 | |
| 2760 // Traverse the execution stack | |
| 2761 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2762 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
| 0 | 2763 } |
| 2764 } | |
| 2765 | |
| 2766 // callee_target is never live across a gc point so NULL it here should | |
| 2767 // it still contain a methdOop. | |
| 2768 | |
| 2769 set_callee_target(NULL); | |
| 2770 | |
| 2771 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2772 // If we have deferred set_locals there might be oops waiting to be | |
| 2773 // written | |
| 2774 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2775 if (list != NULL) { | |
| 2776 for (int i = 0; i < list->length(); i++) { | |
| 2777 list->at(i)->oops_do(f); | |
| 2778 } | |
| 2779 } | |
| 2780 | |
| 2781 // Traverse instance variables at the end since the GC may be moving things | |
| 2782 // around using this function | |
| 2783 f->do_oop((oop*) &_threadObj); | |
| 2784 f->do_oop((oop*) &_vm_result); | |
| 2785 f->do_oop((oop*) &_exception_oop); | |
| 2786 f->do_oop((oop*) &_pending_async_exception); | |
| 2787 | |
| 2788 if (jvmti_thread_state() != NULL) { | |
| 2789 jvmti_thread_state()->oops_do(f); | |
| 2790 } | |
| 2791 } | |
| 2792 | |
|
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2793 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2794 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2795 |
| 2796 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2797 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2798 | |
| 2799 if (has_last_Java_frame()) { | |
| 2800 // Traverse the execution stack | |
| 2801 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2802 fst.current()->nmethods_do(cf); |
| 0 | 2803 } |
| 2804 } | |
| 2805 } | |
| 2806 | |
|
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2807 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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2808 Thread::metadata_do(f); |
|
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2809 if (has_last_Java_frame()) { |
|
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2810 // Traverse the execution stack to call f() on the methods in the stack |
|
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2811 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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2812 fst.current()->metadata_do(f); |
|
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2813 } |
|
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2814 } else if (is_Compiler_thread()) { |
|
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2815 // need to walk ciMetadata in current compile tasks to keep alive. |
|
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2816 CompilerThread* ct = (CompilerThread*)this; |
|
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2817 if (ct->env() != NULL) { |
|
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2818 ct->env()->metadata_do(f); |
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2819 } |
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2820 } |
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2821 } |
|
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|
2822 |
| 0 | 2823 // Printing |
| 2824 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2825 switch (_thread_state) { | |
| 2826 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2827 case _thread_new: return "_thread_new"; | |
| 2828 case _thread_new_trans: return "_thread_new_trans"; | |
| 2829 case _thread_in_native: return "_thread_in_native"; | |
| 2830 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2831 case _thread_in_vm: return "_thread_in_vm"; | |
| 2832 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2833 case _thread_in_Java: return "_thread_in_Java"; | |
| 2834 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2835 case _thread_blocked: return "_thread_blocked"; | |
| 2836 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2837 default: return "unknown thread state"; | |
| 2838 } | |
| 2839 } | |
| 2840 | |
| 2841 #ifndef PRODUCT | |
| 2842 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2843 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2844 }; | |
| 2845 void JavaThread::print_thread_state() const { | |
| 2846 print_thread_state_on(tty); | |
| 2847 }; | |
| 2848 #endif // PRODUCT | |
| 2849 | |
| 2850 // Called by Threads::print() for VM_PrintThreads operation | |
| 2851 void JavaThread::print_on(outputStream *st) const { | |
| 2852 st->print("\"%s\" ", get_thread_name()); | |
| 2853 oop thread_oop = threadObj(); | |
| 6766 | 2854 if (thread_oop != NULL) { |
| 2855 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2856 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2857 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2858 } | |
| 0 | 2859 Thread::print_on(st); |
| 2860 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2861 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2862 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2863 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2864 } | |
| 2865 #ifndef PRODUCT | |
| 2866 print_thread_state_on(st); | |
| 2867 _safepoint_state->print_on(st); | |
| 2868 #endif // PRODUCT | |
| 2869 } | |
| 2870 | |
| 2871 // Called by fatal error handler. The difference between this and | |
| 2872 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2873 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2874 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2875 oop thread_obj = threadObj(); | |
| 2876 if (thread_obj != NULL) { | |
| 2877 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2878 } | |
| 2879 st->print(" ["); | |
| 2880 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2881 if (osthread()) { | |
| 2882 st->print(", id=%d", osthread()->thread_id()); | |
| 2883 } | |
| 2884 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2885 _stack_base - _stack_size, _stack_base); | |
| 2886 st->print("]"); | |
| 2887 return; | |
| 2888 } | |
| 2889 | |
| 2890 // Verification | |
| 2891 | |
| 2892 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2893 | |
| 2894 void JavaThread::verify() { | |
| 2895 // Verify oops in the thread. | |
|
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2896 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
| 0 | 2897 |
| 2898 // Verify the stack frames. | |
| 2899 frames_do(frame_verify); | |
| 2900 } | |
| 2901 | |
| 2902 // CR 6300358 (sub-CR 2137150) | |
| 2903 // Most callers of this method assume that it can't return NULL but a | |
| 2904 // thread may not have a name whilst it is in the process of attaching to | |
| 2905 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2906 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2907 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2908 // for such that this method never returns NULL. | |
| 2909 const char* JavaThread::get_thread_name() const { | |
| 2910 #ifdef ASSERT | |
| 2911 // early safepoints can hit while current thread does not yet have TLS | |
| 2912 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2913 Thread *cur = Thread::current(); | |
| 2914 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2915 // Current JavaThreads are allowed to get their own name without | |
| 2916 // the Threads_lock. | |
| 2917 assert_locked_or_safepoint(Threads_lock); | |
| 2918 } | |
| 2919 } | |
| 2920 #endif // ASSERT | |
| 2921 return get_thread_name_string(); | |
| 2922 } | |
| 2923 | |
| 2924 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2925 // descriptive string if there is no set name | |
| 2926 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2927 const char* name_str; | |
| 2928 oop thread_obj = threadObj(); | |
| 2929 if (thread_obj != NULL) { | |
| 2930 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2931 if (name != NULL) { | |
| 2932 if (buf == NULL) { | |
| 2933 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2934 } | |
| 2935 else { | |
| 2936 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2937 } | |
| 2938 } | |
| 4006 | 2939 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2940 name_str = "<no-name - thread is attaching>"; |
| 2941 } | |
| 2942 else { | |
| 2943 name_str = Thread::name(); | |
| 2944 } | |
| 2945 } | |
| 2946 else { | |
| 2947 name_str = Thread::name(); | |
| 2948 } | |
| 2949 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2950 return name_str; | |
| 2951 } | |
| 2952 | |
| 2953 | |
| 2954 const char* JavaThread::get_threadgroup_name() const { | |
| 2955 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2956 oop thread_obj = threadObj(); | |
| 2957 if (thread_obj != NULL) { | |
| 2958 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2959 if (thread_group != NULL) { | |
| 2960 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2961 // ThreadGroup.name can be null | |
| 2962 if (name != NULL) { | |
| 2963 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2964 return str; | |
| 2965 } | |
| 2966 } | |
| 2967 } | |
| 2968 return NULL; | |
| 2969 } | |
| 2970 | |
| 2971 const char* JavaThread::get_parent_name() const { | |
| 2972 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2973 oop thread_obj = threadObj(); | |
| 2974 if (thread_obj != NULL) { | |
| 2975 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2976 if (thread_group != NULL) { | |
| 2977 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2978 if (parent != NULL) { | |
| 2979 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2980 // ThreadGroup.name can be null | |
| 2981 if (name != NULL) { | |
| 2982 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2983 return str; | |
| 2984 } | |
| 2985 } | |
| 2986 } | |
| 2987 } | |
| 2988 return NULL; | |
| 2989 } | |
| 2990 | |
| 2991 ThreadPriority JavaThread::java_priority() const { | |
| 2992 oop thr_oop = threadObj(); | |
| 2993 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2994 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2995 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2996 return priority; | |
| 2997 } | |
| 2998 | |
| 2999 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 3000 | |
| 3001 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 3002 // Link Java Thread object <-> C++ Thread | |
| 3003 | |
| 3004 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 3005 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 3006 // be used to pass the C++ thread object to other methods. | |
| 3007 | |
| 3008 // Set the Java level thread object (jthread) field of the | |
| 3009 // new thread (a JavaThread *) to C++ thread object using the | |
| 3010 // "thread_oop" handle. | |
| 3011 | |
| 3012 // Set the thread field (a JavaThread *) of the | |
| 3013 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 3014 | |
| 3015 Handle thread_oop(Thread::current(), | |
| 3016 JNIHandles::resolve_non_null(jni_thread)); | |
|
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3017 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 3018 "must be initialized"); |
| 3019 set_threadObj(thread_oop()); | |
| 3020 java_lang_Thread::set_thread(thread_oop(), this); | |
| 3021 | |
| 3022 if (prio == NoPriority) { | |
| 3023 prio = java_lang_Thread::priority(thread_oop()); | |
| 3024 assert(prio != NoPriority, "A valid priority should be present"); | |
| 3025 } | |
| 3026 | |
| 3027 // Push the Java priority down to the native thread; needs Threads_lock | |
| 3028 Thread::set_priority(this, prio); | |
| 3029 | |
| 3030 // Add the new thread to the Threads list and set it in motion. | |
| 3031 // We must have threads lock in order to call Threads::add. | |
| 3032 // It is crucial that we do not block before the thread is | |
| 3033 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 3034 // will not be visited by GC. | |
| 3035 Threads::add(this); | |
| 3036 } | |
| 3037 | |
| 3038 oop JavaThread::current_park_blocker() { | |
| 3039 // Support for JSR-166 locks | |
| 3040 oop thread_oop = threadObj(); | |
| 242 | 3041 if (thread_oop != NULL && |
| 3042 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 3043 return java_lang_Thread::park_blocker(thread_oop); |
| 3044 } | |
| 3045 return NULL; | |
| 3046 } | |
| 3047 | |
| 3048 | |
| 3049 void JavaThread::print_stack_on(outputStream* st) { | |
| 3050 if (!has_last_Java_frame()) return; | |
| 3051 ResourceMark rm; | |
| 3052 HandleMark hm; | |
| 3053 | |
| 3054 RegisterMap reg_map(this); | |
| 3055 vframe* start_vf = last_java_vframe(®_map); | |
| 3056 int count = 0; | |
| 3057 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3058 if (f->is_java_frame()) { | |
| 3059 javaVFrame* jvf = javaVFrame::cast(f); | |
| 3060 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 3061 | |
| 3062 // Print out lock information | |
| 3063 if (JavaMonitorsInStackTrace) { | |
| 3064 jvf->print_lock_info_on(st, count); | |
| 3065 } | |
| 3066 } else { | |
| 3067 // Ignore non-Java frames | |
| 3068 } | |
| 3069 | |
| 3070 // Bail-out case for too deep stacks | |
| 3071 count++; | |
| 3072 if (MaxJavaStackTraceDepth == count) return; | |
| 3073 } | |
| 3074 } | |
| 3075 | |
| 3076 | |
| 3077 // JVMTI PopFrame support | |
| 3078 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 3079 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 3080 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 3081 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 3082 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
1603
d93949c5bdcc
6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
kvn
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1584
diff
changeset
|
3083 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 3084 } |
| 3085 } | |
| 3086 | |
| 3087 void* JavaThread::popframe_preserved_args() { | |
| 3088 return _popframe_preserved_args; | |
| 3089 } | |
| 3090 | |
| 3091 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3092 return in_ByteSize(_popframe_preserved_args_size); | |
| 3093 } | |
| 3094 | |
| 3095 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3096 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3097 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3098 return in_WordSize(sz / wordSize); | |
| 3099 } | |
| 3100 | |
| 3101 void JavaThread::popframe_free_preserved_args() { | |
| 3102 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3103 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3104 _popframe_preserved_args = NULL; |
| 3105 _popframe_preserved_args_size = 0; | |
| 3106 } | |
| 3107 | |
| 3108 #ifndef PRODUCT | |
| 3109 | |
| 3110 void JavaThread::trace_frames() { | |
| 3111 tty->print_cr("[Describe stack]"); | |
| 3112 int frame_no = 1; | |
| 3113 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3114 tty->print(" %d. ", frame_no++); | |
| 3115 fst.current()->print_value_on(tty,this); | |
| 3116 tty->cr(); | |
| 3117 } | |
| 3118 } | |
| 3119 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3120 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3121 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3122 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
|
3123 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3124 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
changeset
|
3125 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3126 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3127 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3128 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
|
3129 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3130 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3131 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3132 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3133 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
|
3134 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3135 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3136 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3137 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3138 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
|
3139 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
|
3140 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3141 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3142 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3143 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
|
3144 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3145 f->print_value(); |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3146 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3147 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3148 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3149 // 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
|
3150 // 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
|
3151 // 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
|
3152 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3153 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3154 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3155 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3156 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3157 |
| 0 | 3158 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3159 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3160 // 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
|
3161 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
|
3162 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3163 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3164 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3165 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3166 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
|
3167 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3168 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3169 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3170 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3171 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3172 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3173 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3174 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3175 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3176 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3177 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3178 |
| 0 | 3179 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3180 ResourceMark rm; | |
| 3181 int vframe_no = 1; | |
| 3182 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3183 if (f->is_java_frame()) { | |
| 3184 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3185 } else { | |
| 3186 f->print(); | |
| 3187 } | |
| 3188 if (vframe_no > StackPrintLimit) { | |
| 3189 tty->print_cr("...<more frames>..."); | |
| 3190 return; | |
| 3191 } | |
| 3192 } | |
| 3193 } | |
| 3194 | |
| 3195 | |
| 3196 void JavaThread::trace_stack() { | |
| 3197 if (!has_last_Java_frame()) return; | |
| 3198 ResourceMark rm; | |
| 3199 HandleMark hm; | |
| 3200 RegisterMap reg_map(this); | |
| 3201 trace_stack_from(last_java_vframe(®_map)); | |
| 3202 } | |
| 3203 | |
| 3204 | |
| 3205 #endif // PRODUCT | |
| 3206 | |
| 3207 | |
| 3208 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3209 assert(reg_map != NULL, "a map must be given"); | |
| 3210 frame f = last_frame(); | |
| 3211 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3212 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3213 } | |
| 3214 return NULL; | |
| 3215 } | |
| 3216 | |
| 3217 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3218 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3219 vframeStream vfst(this); |
| 3220 vfst.security_get_caller_frame(depth); | |
| 3221 if (!vfst.at_end()) { | |
| 3222 return vfst.method()->method_holder(); | |
| 3223 } | |
| 3224 return NULL; | |
| 3225 } | |
| 3226 | |
| 3227 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3228 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3229 CompileBroker::compiler_thread_loop(); | |
| 3230 } | |
| 3231 | |
| 3232 // Create a CompilerThread | |
| 3233 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3234 : JavaThread(&compiler_thread_entry) { | |
| 3235 _env = NULL; | |
| 3236 _log = NULL; | |
| 3237 _task = NULL; | |
| 3238 _queue = queue; | |
| 3239 _counters = counters; | |
| 1584 | 3240 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3241 _scanned_nmethod = NULL; |
| 0 | 3242 |
| 3243 #ifndef PRODUCT | |
| 3244 _ideal_graph_printer = NULL; | |
| 3245 #endif | |
| 3246 } | |
| 3247 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3248 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
|
3249 JavaThread::oops_do(f, cld_f, cf); |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3250 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3251 // 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
|
3252 // 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
|
3253 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3254 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3255 } |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3256 } |
| 0 | 3257 |
| 3258 // ======= Threads ======== | |
| 3259 | |
| 3260 // The Threads class links together all active threads, and provides | |
| 3261 // operations over all threads. It is protected by its own Mutex | |
| 3262 // lock, which is also used in other contexts to protect thread | |
| 3263 // operations from having the thread being operated on from exiting | |
| 3264 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3265 | |
| 3266 JavaThread* Threads::_thread_list = NULL; | |
| 3267 int Threads::_number_of_threads = 0; | |
| 3268 int Threads::_number_of_non_daemon_threads = 0; | |
| 3269 int Threads::_return_code = 0; | |
| 3270 size_t JavaThread::_stack_size_at_create = 0; | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3271 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3272 bool Threads::_vm_complete = false; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3273 #endif |
| 0 | 3274 |
| 3275 // All JavaThreads | |
| 3276 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3277 | |
| 3278 void os_stream(); | |
| 3279 | |
| 3280 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3281 void Threads::threads_do(ThreadClosure* tc) { | |
| 3282 assert_locked_or_safepoint(Threads_lock); | |
| 3283 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3284 ALL_JAVA_THREADS(p) { | |
| 3285 tc->do_thread(p); | |
| 3286 } | |
| 3287 // Someday we could have a table or list of all non-JavaThreads. | |
| 3288 // For now, just manually iterate through them. | |
| 3289 tc->do_thread(VMThread::vm_thread()); | |
| 3290 Universe::heap()->gc_threads_do(tc); | |
|
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3291 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3292 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3293 // the data for WatcherThread is still valid upon being examined. However, |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3294 // considering that WatchThread terminates when the VM is on the way to |
|
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xlu
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286
diff
changeset
|
3295 // exit at safepoint, the chance of the above is extremely small. The right |
|
b33eef719520
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xlu
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286
diff
changeset
|
3296 // way to prevent termination of WatcherThread would be to acquire |
|
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xlu
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286
diff
changeset
|
3297 // Terminator_lock, but we can't do that without violating the lock rank |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3298 // checking in some cases. |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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diff
changeset
|
3299 if (wt != NULL) |
|
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286
diff
changeset
|
3300 tc->do_thread(wt); |
|
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6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3301 |
| 0 | 3302 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3303 } | |
| 3304 | |
| 3305 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3306 | |
| 242 | 3307 extern void JDK_Version_init(); |
| 3308 | |
| 0 | 3309 // Check version |
| 3310 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3311 | |
| 3312 // Initialize the output stream module | |
| 3313 ostream_init(); | |
| 3314 | |
| 3315 // Process java launcher properties. | |
| 3316 Arguments::process_sun_java_launcher_properties(args); | |
| 3317 | |
| 3318 // Initialize the os module before using TLS | |
| 3319 os::init(); | |
| 3320 | |
| 3321 // Initialize system properties. | |
| 3322 Arguments::init_system_properties(); | |
| 3323 | |
| 242 | 3324 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3325 JDK_Version_init(); | |
| 3326 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3327 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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1731
diff
changeset
|
3328 Arguments::init_version_specific_system_properties(); |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
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1731
diff
changeset
|
3329 |
| 0 | 3330 // Parse arguments |
| 3331 jint parse_result = Arguments::parse(args); | |
| 3332 if (parse_result != JNI_OK) return parse_result; | |
| 3333 | |
| 3334 if (PauseAtStartup) { | |
| 3335 os::pause(); | |
| 3336 } | |
| 3337 | |
| 4006 | 3338 #ifndef USDT2 |
| 0 | 3339 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3340 #else /* USDT2 */ |
| 3341 HOTSPOT_VM_INIT_BEGIN(); | |
| 3342 #endif /* USDT2 */ | |
| 0 | 3343 |
| 3344 // Record VM creation timing statistics | |
| 3345 TraceVmCreationTime create_vm_timer; | |
| 3346 create_vm_timer.start(); | |
| 3347 | |
| 3348 // Timing (must come after argument parsing) | |
| 3349 TraceTime timer("Create VM", TraceStartupTime); | |
| 3350 | |
| 3351 // Initialize the os module after parsing the args | |
| 3352 jint os_init_2_result = os::init_2(); | |
| 3353 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3354 | |
|
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
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6985
diff
changeset
|
3355 jint adjust_after_os_result = Arguments::adjust_after_os(); |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3356 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
|
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3357 |
| 6197 | 3358 // intialize TLS |
| 3359 ThreadLocalStorage::init(); | |
| 3360 | |
| 3361 // Bootstrap native memory tracking, so it can start recording memory | |
| 3362 // activities before worker thread is started. This is the first phase | |
| 3363 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3364 MemTracker::bootstrap_single_thread(); | |
| 3365 | |
| 0 | 3366 // Initialize output stream logging |
| 3367 ostream_init_log(); | |
| 3368 | |
| 3369 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3370 // Must be before create_vm_init_agents() | |
| 3371 if (Arguments::init_libraries_at_startup()) { | |
| 3372 convert_vm_init_libraries_to_agents(); | |
| 3373 } | |
| 3374 | |
| 3375 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3376 if (Arguments::init_agents_at_startup()) { | |
| 3377 create_vm_init_agents(); | |
| 3378 } | |
| 3379 | |
| 3380 // Initialize Threads state | |
| 3381 _thread_list = NULL; | |
| 3382 _number_of_threads = 0; | |
| 3383 _number_of_non_daemon_threads = 0; | |
| 3384 | |
| 3385 // Initialize global data structures and create system classes in heap | |
| 3386 vm_init_globals(); | |
| 3387 | |
| 3388 // Attach the main thread to this os thread | |
| 3389 JavaThread* main_thread = new JavaThread(); | |
| 3390 main_thread->set_thread_state(_thread_in_vm); | |
| 3391 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3392 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3393 // change the stack size recorded here to one based on the java thread | |
| 3394 // stacksize. This adjusted size is what is used to figure the placement | |
| 3395 // of the guard pages. | |
| 3396 main_thread->record_stack_base_and_size(); | |
| 3397 main_thread->initialize_thread_local_storage(); | |
| 3398 | |
| 3399 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3400 | |
| 3401 if (!main_thread->set_as_starting_thread()) { | |
| 3402 vm_shutdown_during_initialization( | |
| 3403 "Failed necessary internal allocation. Out of swap space"); | |
| 3404 delete main_thread; | |
| 3405 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3406 return JNI_ENOMEM; | |
| 3407 } | |
| 3408 | |
| 3409 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3410 // crash Linux VM, see notes in os_linux.cpp. | |
| 3411 main_thread->create_stack_guard_pages(); | |
| 3412 | |
| 1878 | 3413 // Initialize Java-Level synchronization subsystem |
| 3414 ObjectMonitor::Initialize() ; | |
| 0 | 3415 |
| 6197 | 3416 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3417 MemTracker::bootstrap_multi_thread(); | |
| 3418 | |
| 0 | 3419 // Initialize global modules |
| 3420 jint status = init_globals(); | |
| 3421 if (status != JNI_OK) { | |
| 3422 delete main_thread; | |
| 3423 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3424 return status; | |
| 3425 } | |
| 3426 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3427 // Should be done after the heap is fully created |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3428 main_thread->cache_global_variables(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3429 |
| 0 | 3430 HandleMark hm; |
| 3431 | |
| 3432 { MutexLocker mu(Threads_lock); | |
| 3433 Threads::add(main_thread); | |
| 3434 } | |
| 3435 | |
| 3436 // Any JVMTI raw monitors entered in onload will transition into | |
| 3437 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3438 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3439 | |
| 6197 | 3440 // Fully start NMT |
| 3441 MemTracker::start(); | |
| 3442 | |
| 0 | 3443 // Create the VMThread |
| 3444 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3445 VMThread::create(); | |
| 3446 Thread* vmthread = VMThread::vm_thread(); | |
| 3447 | |
| 3448 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3449 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3450 | |
| 3451 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3452 // Monitors can have spurious returns, must always check another state flag | |
| 3453 { | |
| 3454 MutexLocker ml(Notify_lock); | |
| 3455 os::start_thread(vmthread); | |
| 3456 while (vmthread->active_handles() == NULL) { | |
| 3457 Notify_lock->wait(); | |
| 3458 } | |
| 3459 } | |
| 3460 } | |
| 3461 | |
| 3462 assert (Universe::is_fully_initialized(), "not initialized"); | |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3463 if (VerifyDuringStartup) { |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3464 // 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
|
3465 VM_Verify verify_op; |
|
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3466 VMThread::execute(&verify_op); |
|
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3467 } |
|
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3468 |
| 0 | 3469 EXCEPTION_MARK; |
| 3470 | |
| 3471 // At this point, the Universe is initialized, but we have not executed | |
| 3472 // any byte code. Now is a good time (the only time) to dump out the | |
| 3473 // internal state of the JVM for sharing. | |
| 3474 if (DumpSharedSpaces) { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3475 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3476 ShouldNotReachHere(); |
| 3477 } | |
| 3478 | |
| 3479 // Always call even when there are not JVMTI environments yet, since environments | |
| 3480 // may be attached late and JVMTI must track phases of VM execution | |
| 3481 JvmtiExport::enter_start_phase(); | |
| 3482 | |
| 3483 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3484 JvmtiExport::post_vm_start(); | |
| 3485 | |
| 3486 { | |
| 3487 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3488 | |
| 3489 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3490 create_vm_init_libraries(); | |
| 3491 } | |
| 3492 | |
| 7608 | 3493 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3494 |
| 3495 // Initialize java_lang.System (needed before creating the thread) | |
| 7608 | 3496 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
| 3497 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
| 3498 Handle thread_group = create_initial_thread_group(CHECK_0); | |
| 3499 Universe::set_main_thread_group(thread_group()); | |
| 3500 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
| 3501 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
| 3502 main_thread->set_threadObj(thread_object); | |
| 3503 // Set thread status to running since main thread has | |
| 3504 // been started and running. | |
| 3505 java_lang_Thread::set_thread_status(thread_object, | |
| 3506 java_lang_Thread::RUNNABLE); | |
| 3507 | |
| 3508 // The VM creates & returns objects of this class. Make sure it's initialized. | |
| 3509 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
| 3510 | |
| 3511 // The VM preresolves methods to these classes. Make sure that they get initialized | |
| 3512 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
| 3513 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
| 3514 call_initializeSystemClass(CHECK_0); | |
| 3515 | |
| 3516 // get the Java runtime name after java.lang.System is initialized | |
| 3517 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
| 3518 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
| 0 | 3519 |
| 3520 // an instance of OutOfMemory exception has been allocated earlier | |
| 7608 | 3521 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
| 3522 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
| 3523 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
| 3524 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
| 3525 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
| 3526 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
| 3527 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
| 3528 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3529 } |
| 0 | 3530 |
| 3531 // See : bugid 4211085. | |
| 3532 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3533 // property"java.compiler" and read & write property "java.vm.info". | |
| 3534 // When a security manager is installed through the command line | |
| 3535 // option "-Djava.security.manager", the above properties are not | |
| 3536 // readable and the static initializer for java.lang.Compiler fails | |
| 3537 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3538 // user code which calls methods in java.lang.Compiler. | |
| 3539 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3540 // system domains are on the stack when the properties are read. | |
| 3541 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3542 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3543 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3544 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3545 // Once that is done, we should remove this hack. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3546 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3547 |
| 3548 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3549 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3550 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3551 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3552 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3553 reset_vm_info_property(CHECK_0); | |
| 3554 | |
| 3555 quicken_jni_functions(); | |
| 3556 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3557 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3558 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3559 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3560 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3561 |
| 0 | 3562 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3563 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3564 set_init_completed(); | |
| 3565 | |
| 4006 | 3566 #ifndef USDT2 |
| 0 | 3567 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3568 #else /* USDT2 */ |
| 3569 HOTSPOT_VM_INIT_END(); | |
| 3570 #endif /* USDT2 */ | |
| 0 | 3571 |
| 3572 // record VM initialization completion time | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3573 #if INCLUDE_MANAGEMENT |
| 0 | 3574 Management::record_vm_init_completed(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3575 #endif // INCLUDE_MANAGEMENT |
| 0 | 3576 |
| 3577 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3578 // valid exceptions may be thrown in the process. | |
| 3579 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3580 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3581 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3582 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3583 if (HAS_PENDING_EXCEPTION) { | |
| 3584 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3585 } | |
| 3586 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3587 #if INCLUDE_ALL_GCS |
| 0 | 3588 // Support for ConcurrentMarkSweep. This should be cleaned up |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3589 // 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
|
3590 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3591 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3592 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3593 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3594 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3595 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3596 } |
| 0 | 3597 if (HAS_PENDING_EXCEPTION) { |
| 3598 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3599 } | |
| 3600 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3601 #endif // INCLUDE_ALL_GCS |
| 0 | 3602 |
| 3603 // Always call even when there are not JVMTI environments yet, since environments | |
| 3604 // may be attached late and JVMTI must track phases of VM execution | |
| 3605 JvmtiExport::enter_live_phase(); | |
| 3606 | |
| 3607 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3608 os::signal_init(); | |
| 3609 | |
| 3610 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3611 if (!DisableAttachMechanism) { | |
|
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3612 AttachListener::vm_start(); |
| 0 | 3613 if (StartAttachListener || AttachListener::init_at_startup()) { |
| 3614 AttachListener::init(); | |
| 3615 } | |
| 3616 } | |
| 3617 | |
| 3618 // Launch -Xrun agents | |
| 3619 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3620 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3621 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3622 create_vm_init_libraries(); | |
| 3623 } | |
| 3624 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3625 // 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
|
3626 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3627 |
| 10405 | 3628 if (TRACE_START() != JNI_OK) { |
| 3629 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
|
3630 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3631 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3632 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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3769
diff
changeset
|
3633 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
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parents:
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diff
changeset
|
3634 } |
| 0 | 3635 |
| 3636 // initialize compiler(s) | |
| 7195 | 3637 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
| 0 | 3638 CompileBroker::compilation_init(); |
|
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6769
diff
changeset
|
3639 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
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changeset
|
3640 |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
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diff
changeset
|
3641 #if INCLUDE_MANAGEMENT |
| 0 | 3642 Management::initialize(THREAD); |
|
6854
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diff
changeset
|
3643 #endif // INCLUDE_MANAGEMENT |
|
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7189254: Change makefiles for more flexibility to override defaults
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changeset
|
3644 |
| 0 | 3645 if (HAS_PENDING_EXCEPTION) { |
| 3646 // management agent fails to start possibly due to | |
| 3647 // configuration problem and is responsible for printing | |
| 3648 // stack trace if appropriate. Simply exit VM. | |
| 3649 vm_exit(1); | |
| 3650 } | |
| 3651 | |
| 3652 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3653 if (MemProfiling) MemProfiler::engage(); | |
| 3654 StatSampler::engage(); | |
| 3655 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3656 | |
| 3657 BiasedLocking::init(); | |
| 3658 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
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2126
diff
changeset
|
3659 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
|
3660 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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diff
changeset
|
3661 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3662 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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diff
changeset
|
3663 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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diff
changeset
|
3664 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3665 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
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diff
changeset
|
3666 } |
| 0 | 3667 |
|
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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6921
diff
changeset
|
3668 { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
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diff
changeset
|
3669 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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diff
changeset
|
3670 // 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
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diff
changeset
|
3671 // or by dynamic enrollment. |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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diff
changeset
|
3672 WatcherThread::make_startable(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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diff
changeset
|
3673 // Start up the WatcherThread if there are any periodic tasks |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
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diff
changeset
|
3674 // NOTE: All PeriodicTasks should be registered by now. If they |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
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diff
changeset
|
3675 // 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
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diff
changeset
|
3676 // take a while to process their first tick). |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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diff
changeset
|
3677 if (PeriodicTask::num_tasks() > 0) { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
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6921
diff
changeset
|
3678 WatcherThread::start(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
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diff
changeset
|
3679 } |
| 0 | 3680 } |
| 3681 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3682 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3683 os::init_3(); |
|
126ea7725993
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bobv
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1608
diff
changeset
|
3684 |
| 0 | 3685 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3686 #ifdef ASSERT |
|
da91efe96a93
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coleenp
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diff
changeset
|
3687 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3688 #endif |
| 0 | 3689 return JNI_OK; |
| 3690 } | |
| 3691 | |
| 3692 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3693 extern "C" { | |
| 3694 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3695 } | |
| 3696 // Find a command line agent library and return its entry point for | |
| 3697 // -agentlib: -agentpath: -Xrun | |
| 3698 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3699 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3700 OnLoadEntry_t on_load_entry = NULL; | |
|
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|
3701 void *library = NULL; |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
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|
3702 |
|
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8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
changeset
|
3703 if (!agent->valid()) { |
| 0 | 3704 char buffer[JVM_MAXPATHLEN]; |
| 3705 char ebuf[1024]; | |
| 3706 const char *name = agent->name(); | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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diff
changeset
|
3707 const char *msg = "Could not find agent library "; |
| 0 | 3708 |
|
12117
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changeset
|
3709 // First check to see if agent is statcally linked into executable |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
changeset
|
3710 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
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changeset
|
3711 library = agent->os_lib(); |
|
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8014135: The JVMTI specification does not conform to recent changes in JNI specification
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diff
changeset
|
3712 } else if (agent->is_absolute_path()) { |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3713 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3714 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3715 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
|
3716 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3717 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
|
3718 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3719 // 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
|
3720 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3721 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3722 } |
| 3723 } else { | |
| 3724 // 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
|
3725 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
|
3726 name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3727 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
|
3728 } |
| 0 | 3729 if (library == NULL) { // Try the local directory |
| 3730 char ns[1] = {0}; | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3731 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3732 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
|
3733 } |
| 0 | 3734 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3735 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3736 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3737 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
|
3738 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3739 // 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
|
3740 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3741 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3742 } |
| 3743 } | |
| 3744 } | |
| 3745 agent->set_os_lib(library); | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3746 agent->set_valid(); |
| 0 | 3747 } |
| 3748 | |
| 3749 // Find the OnLoad function. | |
|
12117
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3750 on_load_entry = |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3751 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3752 false, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3753 on_load_symbols, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3754 num_symbol_entries)); |
| 0 | 3755 return on_load_entry; |
| 3756 } | |
| 3757 | |
| 3758 // Find the JVM_OnLoad entry point | |
| 3759 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3760 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3761 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3762 } | |
| 3763 | |
| 3764 // Find the Agent_OnLoad entry point | |
| 3765 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3766 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3767 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3768 } | |
| 3769 | |
| 3770 // For backwards compatibility with -Xrun | |
| 3771 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3772 // treated like -agentpath: | |
| 3773 // Must be called before agent libraries are created | |
| 3774 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3775 AgentLibrary* agent; | |
| 3776 AgentLibrary* next; | |
| 3777 | |
| 3778 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3779 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3780 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3781 | |
| 3782 // If there is an JVM_OnLoad function it will get called later, | |
| 3783 // otherwise see if there is an Agent_OnLoad | |
| 3784 if (on_load_entry == NULL) { | |
| 3785 on_load_entry = lookup_agent_on_load(agent); | |
| 3786 if (on_load_entry != NULL) { | |
| 3787 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3788 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3789 Arguments::convert_library_to_agent(agent); | |
| 3790 } else { | |
| 3791 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3792 } | |
| 3793 } | |
| 3794 } | |
| 3795 } | |
| 3796 | |
| 3797 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3798 // Invokes Agent_OnLoad | |
| 3799 // Called very early -- before JavaThreads exist | |
| 3800 void Threads::create_vm_init_agents() { | |
| 3801 extern struct JavaVM_ main_vm; | |
| 3802 AgentLibrary* agent; | |
| 3803 | |
| 3804 JvmtiExport::enter_onload_phase(); | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
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6769
diff
changeset
|
3805 |
| 0 | 3806 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3807 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3808 | |
| 3809 if (on_load_entry != NULL) { | |
| 3810 // Invoke the Agent_OnLoad function | |
| 3811 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3812 if (err != JNI_OK) { | |
| 3813 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3814 } | |
| 3815 } else { | |
| 3816 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3817 } | |
| 3818 } | |
| 3819 JvmtiExport::enter_primordial_phase(); | |
| 3820 } | |
| 3821 | |
| 3822 extern "C" { | |
| 3823 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3824 } | |
| 3825 | |
| 3826 void Threads::shutdown_vm_agents() { | |
| 3827 // Send any Agent_OnUnload notifications | |
| 3828 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
|
12117
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11154
diff
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|
3829 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); |
| 0 | 3830 extern struct JavaVM_ main_vm; |
| 3831 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3832 | |
| 3833 // Find the Agent_OnUnload function. | |
|
12117
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bpittore
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11154
diff
changeset
|
3834 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
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11154
diff
changeset
|
3835 os::find_agent_function(agent, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3836 false, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3837 on_unload_symbols, |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3838 num_symbol_entries)); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
parents:
11154
diff
changeset
|
3839 |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
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11154
diff
changeset
|
3840 // Invoke the Agent_OnUnload function |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
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11154
diff
changeset
|
3841 if (unload_entry != NULL) { |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
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11154
diff
changeset
|
3842 JavaThread* thread = JavaThread::current(); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
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11154
diff
changeset
|
3843 ThreadToNativeFromVM ttn(thread); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
bpittore
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11154
diff
changeset
|
3844 HandleMark hm(thread); |
|
f92b82d454fa
8014135: The JVMTI specification does not conform to recent changes in JNI specification
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11154
diff
changeset
|
3845 (*unload_entry)(&main_vm); |
| 0 | 3846 } |
| 3847 } | |
| 3848 } | |
| 3849 | |
| 3850 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3851 // Invokes JVM_OnLoad | |
| 3852 void Threads::create_vm_init_libraries() { | |
| 3853 extern struct JavaVM_ main_vm; | |
| 3854 AgentLibrary* agent; | |
| 3855 | |
| 3856 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3857 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3858 | |
| 3859 if (on_load_entry != NULL) { | |
| 3860 // Invoke the JVM_OnLoad function | |
| 3861 JavaThread* thread = JavaThread::current(); | |
| 3862 ThreadToNativeFromVM ttn(thread); | |
| 3863 HandleMark hm(thread); | |
| 3864 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3865 if (err != JNI_OK) { | |
| 3866 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3867 } | |
| 3868 } else { | |
| 3869 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3870 } | |
| 3871 } | |
| 3872 } | |
| 3873 | |
| 3874 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3875 void JavaThread::invoke_shutdown_hooks() { | |
| 3876 HandleMark hm(this); | |
| 3877 | |
| 3878 // We could get here with a pending exception, if so clear it now. | |
| 3879 if (this->has_pending_exception()) { | |
| 3880 this->clear_pending_exception(); | |
| 3881 } | |
| 3882 | |
| 3883 EXCEPTION_MARK; | |
|
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3884 Klass* k = |
|
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|
3885 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3886 THREAD); |
| 3887 if (k != NULL) { | |
| 3888 // SystemDictionary::resolve_or_null will return null if there was | |
| 3889 // an exception. If we cannot load the Shutdown class, just don't | |
| 3890 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3891 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3892 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3893 // was called, the Shutdown class would have already been loaded | |
| 3894 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3895 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3896 JavaValue result(T_VOID); | |
| 3897 JavaCalls::call_static(&result, | |
| 3898 shutdown_klass, | |
|
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|
3899 vmSymbols::shutdown_method_name(), |
|
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|
3900 vmSymbols::void_method_signature(), |
| 0 | 3901 THREAD); |
| 3902 } | |
| 3903 CLEAR_PENDING_EXCEPTION; | |
| 3904 } | |
| 3905 | |
| 3906 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3907 // the program falls off the end of main(). Another VM exit path is through | |
| 3908 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3909 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3910 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3911 // and VM_Exit op at VM level. | |
| 3912 // | |
| 3913 // Shutdown sequence: | |
| 6197 | 3914 // + Shutdown native memory tracking if it is on |
| 0 | 3915 // + Wait until we are the last non-daemon thread to execute |
| 3916 // <-- every thing is still working at this moment --> | |
| 3917 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3918 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3919 // + Call before_exit(), prepare for VM exit | |
| 3920 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3921 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3922 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3923 // post thread end and vm death events to JVMTI, | |
| 3924 // stop signal thread | |
| 3925 // + Call JavaThread::exit(), it will: | |
| 3926 // > release JNI handle blocks, remove stack guard pages | |
| 3927 // > remove this thread from Threads list | |
| 3928 // <-- no more Java code from this thread after this point --> | |
| 3929 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3930 // the compiler threads at safepoint | |
| 3931 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3932 // + Disable tracing at JNI/JVM barriers | |
| 3933 // + Set _vm_exited flag for threads that are still running native code | |
| 3934 // + Delete this thread | |
| 3935 // + Call exit_globals() | |
| 3936 // > deletes tty | |
| 3937 // > deletes PerfMemory resources | |
| 3938 // + Return to caller | |
| 3939 | |
| 3940 bool Threads::destroy_vm() { | |
| 3941 JavaThread* thread = JavaThread::current(); | |
| 3942 | |
|
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3943 #ifdef ASSERT |
|
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3944 _vm_complete = false; |
|
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|
3945 #endif |
| 0 | 3946 // Wait until we are the last non-daemon thread to execute |
| 3947 { MutexLocker nu(Threads_lock); | |
| 3948 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3949 // This wait should make safepoint checks, wait without a timeout, | |
| 3950 // and wait as a suspend-equivalent condition. | |
| 3951 // | |
| 3952 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3953 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3954 // is waiting for the external suspend request on this thread to | |
| 3955 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3956 // timeout, but that takes time. Making this wait a suspend- | |
| 3957 // equivalent condition solves that timeout problem. | |
| 3958 // | |
| 3959 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3960 Mutex::_as_suspend_equivalent_flag); | |
| 3961 } | |
| 3962 | |
| 3963 // Hang forever on exit if we are reporting an error. | |
| 3964 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3965 os::infinite_sleep(); | |
| 3966 } | |
|
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|
3967 os::wait_for_keypress_at_exit(); |
| 0 | 3968 |
| 3969 if (JDK_Version::is_jdk12x_version()) { | |
| 3970 // We are the last thread running, so check if finalizers should be run. | |
| 3971 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3972 HandleMark rm(thread); | |
| 3973 Universe::run_finalizers_on_exit(); | |
| 3974 } else { | |
| 3975 // run Java level shutdown hooks | |
| 3976 thread->invoke_shutdown_hooks(); | |
| 3977 } | |
| 3978 | |
| 3979 before_exit(thread); | |
| 3980 | |
| 3981 thread->exit(true); | |
| 3982 | |
| 3983 // Stop VM thread. | |
| 3984 { | |
| 3985 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3986 // GC vm_operations can get caught at the safepoint, and the | |
| 3987 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3988 // to prevent this. The GC vm_operations will not be able to | |
| 3989 // queue until after the vm thread is dead. | |
|
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3990 // After this point, we'll never emerge out of the safepoint before |
|
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|
3991 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
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|
3992 // stopped; they remain inactive until the process exits. |
|
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|
3993 // Note: some concurrent G1 threads may be running during a safepoint, |
|
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3994 // but these will not be accessing the heap, just some G1-specific side |
|
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|
3995 // data structures that are not accessed by any other threads but them |
|
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|
3996 // after this point in a terminal safepoint. |
|
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|
3997 |
| 0 | 3998 MutexLocker ml(Heap_lock); |
| 3999 | |
| 4000 VMThread::wait_for_vm_thread_exit(); | |
| 4001 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 4002 VMThread::destroy(); | |
| 4003 } | |
| 4004 | |
| 4005 // clean up ideal graph printers | |
| 4006 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 4007 IdealGraphPrinter::clean_up(); | |
| 4008 #endif | |
| 4009 | |
| 4010 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 4011 // running Java code or in VM are stopped by the Safepoint. However, | |
| 4012 // daemon threads executing native code are still running. But they | |
| 4013 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 4014 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 4015 | |
| 4016 #ifndef PRODUCT | |
| 4017 // disable function tracing at JNI/JVM barriers | |
| 4018 TraceJNICalls = false; | |
| 4019 TraceJVMCalls = false; | |
| 4020 TraceRuntimeCalls = false; | |
| 4021 #endif | |
| 4022 | |
| 4023 VM_Exit::set_vm_exited(); | |
| 4024 | |
| 4025 notify_vm_shutdown(); | |
| 4026 | |
| 4027 delete thread; | |
| 4028 | |
| 4029 // exit_globals() will delete tty | |
| 4030 exit_globals(); | |
| 4031 | |
| 4032 return true; | |
| 4033 } | |
| 4034 | |
| 4035 | |
| 4036 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4037 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4038 return is_supported_jni_version(version); | |
| 4039 } | |
| 4040 | |
| 4041 | |
| 4042 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4043 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4044 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4045 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
|
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|
4046 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
| 0 | 4047 return JNI_FALSE; |
| 4048 } | |
| 4049 | |
| 4050 | |
| 4051 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4052 // The threads lock must be owned at this point | |
| 4053 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4054 |
|
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|
4055 // See the comment for this method in thread.hpp for its purpose and |
|
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|
4056 // why it is called here. |
|
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|
4057 p->initialize_queues(); |
| 0 | 4058 p->set_next(_thread_list); |
| 4059 _thread_list = p; | |
| 4060 _number_of_threads++; | |
| 4061 oop threadObj = p->threadObj(); | |
| 4062 bool daemon = true; | |
| 4063 // Bootstrapping problem: threadObj can be null for initial | |
| 4064 // JavaThread (or for threads attached via JNI) | |
| 4065 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4066 _number_of_non_daemon_threads++; | |
| 4067 daemon = false; | |
| 4068 } | |
| 4069 | |
| 6197 | 4070 p->set_safepoint_visible(true); |
| 4071 | |
| 0 | 4072 ThreadService::add_thread(p, daemon); |
| 4073 | |
| 4074 // Possible GC point. | |
|
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|
4075 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4076 } |
| 4077 | |
| 4078 void Threads::remove(JavaThread* p) { | |
| 4079 // Extra scope needed for Thread_lock, so we can check | |
| 4080 // that we do not remove thread without safepoint code notice | |
| 4081 { MutexLocker ml(Threads_lock); | |
| 4082 | |
| 4083 assert(includes(p), "p must be present"); | |
| 4084 | |
| 4085 JavaThread* current = _thread_list; | |
| 4086 JavaThread* prev = NULL; | |
| 4087 | |
| 4088 while (current != p) { | |
| 4089 prev = current; | |
| 4090 current = current->next(); | |
| 4091 } | |
| 4092 | |
| 4093 if (prev) { | |
| 4094 prev->set_next(current->next()); | |
| 4095 } else { | |
| 4096 _thread_list = p->next(); | |
| 4097 } | |
| 4098 _number_of_threads--; | |
| 4099 oop threadObj = p->threadObj(); | |
| 4100 bool daemon = true; | |
| 4101 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4102 _number_of_non_daemon_threads--; | |
| 4103 daemon = false; | |
| 4104 | |
| 4105 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4106 // on destroy_vm will wake up. | |
| 4107 if (number_of_non_daemon_threads() == 1) | |
| 4108 Threads_lock->notify_all(); | |
| 4109 } | |
| 4110 ThreadService::remove_thread(p, daemon); | |
| 4111 | |
| 4112 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4113 // the thread might mess around with locks after this point. This can cause it | |
| 4114 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4115 // of this thread since it is removed from the queue. | |
| 4116 p->set_terminated_value(); | |
| 6197 | 4117 |
| 4118 // Now, this thread is not visible to safepoint | |
| 4119 p->set_safepoint_visible(false); | |
|
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4120 // once the thread becomes safepoint invisible, we can not use its per-thread |
|
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4121 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
|
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4122 // to release its per-thread recorder here. |
|
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|
4123 MemTracker::thread_exiting(p); |
| 0 | 4124 } // unlock Threads_lock |
| 4125 | |
| 4126 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4127 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4128 } |
| 4129 | |
| 4130 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4131 bool Threads::includes(JavaThread* p) { | |
| 4132 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4133 ALL_JAVA_THREADS(q) { | |
| 4134 if (q == p ) { | |
| 4135 return true; | |
| 4136 } | |
| 4137 } | |
| 4138 return false; | |
| 4139 } | |
| 4140 | |
| 4141 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4142 // but the garbage collector must provide a safe context for them to run. | |
| 4143 // In particular, these things should never be called when the Threads_lock | |
| 4144 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4145 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4146 // all threads gets blocked when exiting or starting). | |
| 4147 | |
|
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|
4148 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4149 ALL_JAVA_THREADS(p) { |
|
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|
4150 p->oops_do(f, cld_f, cf); |
| 0 | 4151 } |
|
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|
4152 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
| 0 | 4153 } |
| 4154 | |
|
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|
4155 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4156 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4157 // root groups. Overhead should be small enough to use all the time, | |
| 4158 // even in sequential code. | |
| 4159 SharedHeap* sh = SharedHeap::heap(); | |
|
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|
4160 // Cannot yet substitute active_workers for n_par_threads |
|
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|
4161 // because of G1CollectedHeap::verify() use of |
|
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|
4162 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
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|
4163 // turn off parallelism in process_strong_roots while active_workers |
|
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|
4164 // is being used for parallelism elsewhere. |
|
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|
4165 bool is_par = sh->n_par_threads() > 0; |
|
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|
4166 assert(!is_par || |
|
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|
4167 (SharedHeap::heap()->n_par_threads() == |
|
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|
4168 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4169 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4170 ALL_JAVA_THREADS(p) { | |
| 4171 if (p->claim_oops_do(is_par, cp)) { | |
|
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|
4172 p->oops_do(f, cld_f, cf); |
| 0 | 4173 } |
| 4174 } | |
| 4175 VMThread* vmt = VMThread::vm_thread(); | |
|
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|
4176 if (vmt->claim_oops_do(is_par, cp)) { |
|
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|
4177 vmt->oops_do(f, cld_f, cf); |
|
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|
4178 } |
| 0 | 4179 } |
| 4180 | |
|
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|
4181 #if INCLUDE_ALL_GCS |
| 0 | 4182 // Used by ParallelScavenge |
| 4183 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4184 ALL_JAVA_THREADS(p) { | |
| 4185 q->enqueue(new ThreadRootsTask(p)); | |
| 4186 } | |
| 4187 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4188 } | |
| 4189 | |
| 4190 // Used by Parallel Old | |
| 4191 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4192 ALL_JAVA_THREADS(p) { | |
| 4193 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4194 } | |
| 4195 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4196 } | |
|
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|
4197 #endif // INCLUDE_ALL_GCS |
| 0 | 4198 |
|
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|
4199 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4200 ALL_JAVA_THREADS(p) { |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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844
diff
changeset
|
4201 p->nmethods_do(cf); |
| 0 | 4202 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4203 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4204 } |
| 4205 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
4206 void Threads::metadata_do(void f(Metadata*)) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
4207 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
4208 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4209 } |
|
da91efe96a93
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coleenp
parents:
6198
diff
changeset
|
4210 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4211 |
| 0 | 4212 void Threads::gc_epilogue() { |
| 4213 ALL_JAVA_THREADS(p) { | |
| 4214 p->gc_epilogue(); | |
| 4215 } | |
| 4216 } | |
| 4217 | |
| 4218 void Threads::gc_prologue() { | |
| 4219 ALL_JAVA_THREADS(p) { | |
| 4220 p->gc_prologue(); | |
| 4221 } | |
| 4222 } | |
| 4223 | |
| 4224 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4225 ALL_JAVA_THREADS(p) { | |
| 4226 p->deoptimized_wrt_marked_nmethods(); | |
| 4227 } | |
| 4228 } | |
| 4229 | |
| 4230 | |
| 4231 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4232 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4233 address monitor, bool doLock) { | |
| 4234 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4235 "must grab Threads_lock or be at safepoint"); | |
| 4236 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4237 | |
| 4238 int i = 0; | |
| 4239 { | |
| 4240 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4241 ALL_JAVA_THREADS(p) { | |
| 4242 if (p->is_Compiler_thread()) continue; | |
| 4243 | |
| 4244 address pending = (address)p->current_pending_monitor(); | |
| 4245 if (pending == monitor) { // found a match | |
| 4246 if (i < count) result->append(p); // save the first count matches | |
| 4247 i++; | |
| 4248 } | |
| 4249 } | |
| 4250 } | |
| 4251 return result; | |
| 4252 } | |
| 4253 | |
| 4254 | |
| 4255 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4256 assert(doLock || | |
| 4257 Threads_lock->owned_by_self() || | |
| 4258 SafepointSynchronize::is_at_safepoint(), | |
| 4259 "must grab Threads_lock or be at safepoint"); | |
| 4260 | |
| 4261 // NULL owner means not locked so we can skip the search | |
| 4262 if (owner == NULL) return NULL; | |
| 4263 | |
| 4264 { | |
| 4265 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4266 ALL_JAVA_THREADS(p) { | |
| 4267 // first, see if owner is the address of a Java thread | |
| 4268 if (owner == (address)p) return p; | |
| 4269 } | |
| 4270 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4271 // 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
|
4272 // 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
|
4273 // like deadlock detection. |
| 0 | 4274 if (UseHeavyMonitors) return NULL; |
| 4275 | |
| 4276 // | |
| 4277 // If we didn't find a matching Java thread and we didn't force use of | |
| 4278 // heavyweight monitors, then the owner is the stack address of the | |
| 4279 // Lock Word in the owning Java thread's stack. | |
| 4280 // | |
| 4281 JavaThread* the_owner = NULL; | |
| 4282 { | |
| 4283 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4284 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4285 if (q->is_lock_owned(owner)) { |
| 0 | 4286 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4287 break; |
| 0 | 4288 } |
| 4289 } | |
| 4290 } | |
|
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4291 // cannot assert on lack of success here; see above comment |
| 0 | 4292 return the_owner; |
| 4293 } | |
| 4294 | |
| 4295 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4296 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4297 char buf[32]; | |
| 4298 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4299 | |
| 4300 st->print_cr("Full thread dump %s (%s %s):", | |
| 4301 Abstract_VM_Version::vm_name(), | |
| 4302 Abstract_VM_Version::vm_release(), | |
| 4303 Abstract_VM_Version::vm_info_string() | |
| 4304 ); | |
| 4305 st->cr(); | |
| 4306 | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4307 #if INCLUDE_ALL_GCS |
| 0 | 4308 // Dump concurrent locks |
| 4309 ConcurrentLocksDump concurrent_locks; | |
| 4310 if (print_concurrent_locks) { | |
| 4311 concurrent_locks.dump_at_safepoint(); | |
| 4312 } | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4313 #endif // INCLUDE_ALL_GCS |
| 0 | 4314 |
| 4315 ALL_JAVA_THREADS(p) { | |
| 4316 ResourceMark rm; | |
| 4317 p->print_on(st); | |
| 4318 if (print_stacks) { | |
| 4319 if (internal_format) { | |
| 4320 p->trace_stack(); | |
| 4321 } else { | |
| 4322 p->print_stack_on(st); | |
| 4323 } | |
| 4324 } | |
| 4325 st->cr(); | |
|
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4326 #if INCLUDE_ALL_GCS |
| 0 | 4327 if (print_concurrent_locks) { |
| 4328 concurrent_locks.print_locks_on(p, st); | |
| 4329 } | |
|
8001
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jprovino
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7615
diff
changeset
|
4330 #endif // INCLUDE_ALL_GCS |
| 0 | 4331 } |
| 4332 | |
| 4333 VMThread::vm_thread()->print_on(st); | |
| 4334 st->cr(); | |
| 4335 Universe::heap()->print_gc_threads_on(st); | |
| 4336 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4337 if (wt != NULL) { |
| 4338 wt->print_on(st); | |
| 4339 st->cr(); | |
| 4340 } | |
| 0 | 4341 CompileBroker::print_compiler_threads_on(st); |
| 4342 st->flush(); | |
| 4343 } | |
| 4344 | |
| 4345 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4346 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4347 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4348 // memory (even in resource area), it might deadlock the error handler. | |
| 4349 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4350 bool found_current = false; | |
| 4351 st->print_cr("Java Threads: ( => current thread )"); | |
| 4352 ALL_JAVA_THREADS(thread) { | |
| 4353 bool is_current = (current == thread); | |
| 4354 found_current = found_current || is_current; | |
| 4355 | |
| 4356 st->print("%s", is_current ? "=>" : " "); | |
| 4357 | |
| 4358 st->print(PTR_FORMAT, thread); | |
| 4359 st->print(" "); | |
| 4360 thread->print_on_error(st, buf, buflen); | |
| 4361 st->cr(); | |
| 4362 } | |
| 4363 st->cr(); | |
| 4364 | |
| 4365 st->print_cr("Other Threads:"); | |
| 4366 if (VMThread::vm_thread()) { | |
| 4367 bool is_current = (current == VMThread::vm_thread()); | |
| 4368 found_current = found_current || is_current; | |
| 4369 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4370 | |
| 4371 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4372 st->print(" "); | |
| 4373 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4374 st->cr(); | |
| 4375 } | |
| 4376 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4377 if (wt != NULL) { | |
| 4378 bool is_current = (current == wt); | |
| 4379 found_current = found_current || is_current; | |
| 4380 st->print("%s", is_current ? "=>" : " "); | |
| 4381 | |
| 4382 st->print(PTR_FORMAT, wt); | |
| 4383 st->print(" "); | |
| 4384 wt->print_on_error(st, buf, buflen); | |
| 4385 st->cr(); | |
| 4386 } | |
| 4387 if (!found_current) { | |
| 4388 st->cr(); | |
| 4389 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4390 current->print_on_error(st, buf, buflen); | |
| 4391 st->cr(); | |
| 4392 } | |
| 4393 } | |
| 4394 | |
| 1878 | 4395 // Internal SpinLock and Mutex |
| 4396 // Based on ParkEvent | |
| 4397 | |
| 4398 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4399 // |
| 1878 | 4400 // We employ SpinLocks _only for low-contention, fixed-length |
| 4401 // short-duration critical sections where we're concerned | |
| 4402 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4403 // The mux construct provides a spin-then-block mutual exclusion | |
| 4404 // mechanism. | |
| 4405 // | |
| 4406 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4407 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4408 // for the JVM to devolve to yielding with little progress. This is true | |
| 4409 // despite the fact that the critical sections protected by ListLock are | |
| 4410 // extremely short. | |
| 0 | 4411 // |
| 1878 | 4412 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4413 // We should make this a 1st-class type, integrated into the lock | |
| 4414 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4415 // should have sufficient padding to avoid false-sharing and excessive | |
| 4416 // cache-coherency traffic. | |
| 4417 | |
| 4418 | |
| 4419 typedef volatile int SpinLockT ; | |
| 4420 | |
| 4421 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4422 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4423 return ; // normal fast-path return | |
| 4424 } | |
| 4425 | |
| 4426 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4427 TEVENT (SpinAcquire - ctx) ; | |
| 4428 int ctr = 0 ; | |
| 4429 int Yields = 0 ; | |
| 0 | 4430 for (;;) { |
| 1878 | 4431 while (*adr != 0) { |
| 4432 ++ctr ; | |
| 4433 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4434 if (Yields > 5) { | |
| 4435 // Consider using a simple NakedSleep() instead. | |
| 4436 // Then SpinAcquire could be called by non-JVM threads | |
| 4437 Thread::current()->_ParkEvent->park(1) ; | |
| 4438 } else { | |
| 4439 os::NakedYield() ; | |
| 4440 ++Yields ; | |
| 4441 } | |
| 4442 } else { | |
| 4443 SpinPause() ; | |
| 0 | 4444 } |
| 1878 | 4445 } |
| 4446 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4447 } |
| 4448 } | |
| 4449 | |
| 1878 | 4450 void Thread::SpinRelease (volatile int * adr) { |
| 4451 assert (*adr != 0, "invariant") ; | |
| 4452 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4453 // Roach-motel semantics. | |
| 4454 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4455 // but prior LDs and STs within the critical section can't be allowed | |
| 4456 // to reorder or float past the ST that releases the lock. | |
| 4457 *adr = 0 ; | |
| 0 | 4458 } |
| 4459 | |
| 1878 | 4460 // muxAcquire and muxRelease: |
| 4461 // | |
| 4462 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4463 // The LSB of the word is set IFF the lock is held. | |
| 4464 // The remainder of the word points to the head of a singly-linked list | |
| 4465 // of threads blocked on the lock. | |
| 4466 // | |
| 4467 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4468 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4469 // minimizing the peak number of extant ParkEvent instances then | |
| 4470 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4471 // as certain invariants were satisfied. Specifically, care would need | |
| 4472 // to be taken with regards to consuming unpark() "permits". | |
| 4473 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4474 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4475 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4476 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4477 // One way around this would be to widen the restricted-range semaphore | |
| 4478 // implemented in park(). Another alternative would be to provide | |
| 4479 // multiple instances of the PlatformEvent() for each thread. One | |
| 4480 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4481 // | |
| 4482 // * Usage: | |
| 4483 // -- Only as leaf locks | |
| 4484 // -- for short-term locking only as muxAcquire does not perform | |
| 4485 // thread state transitions. | |
| 4486 // | |
| 4487 // Alternatives: | |
| 4488 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4489 // but with parking or spin-then-park instead of pure spinning. | |
| 4490 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4491 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4492 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4493 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4494 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4495 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4496 // boundaries by using placement-new. | |
| 4497 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4498 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4499 // The validity of the backlinks must be ratified before we trust the value. | |
| 4500 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4501 // the forward links, which are always trustworthy. | |
| 4502 // * Add a successor indication. The LockWord is currently encoded as | |
| 4503 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4504 // to provide the usual futile-wakeup optimization. | |
| 4505 // See RTStt for details. | |
| 4506 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4507 // | |
| 4508 | |
| 4509 | |
| 4510 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4511 enum MuxBits { LOCKBIT = 1 } ; | |
| 4512 | |
| 4513 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4514 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4515 if (w == 0) return ; | |
| 4516 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4517 return ; | |
| 4518 } | |
| 4519 | |
| 4520 TEVENT (muxAcquire - Contention) ; | |
| 4521 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4522 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4523 for (;;) { |
| 1878 | 4524 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4525 | |
| 4526 // Optional spin phase: spin-then-park strategy | |
| 4527 while (--its >= 0) { | |
| 4528 w = *Lock ; | |
| 4529 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4530 return ; | |
| 4531 } | |
| 4532 } | |
| 4533 | |
| 4534 Self->reset() ; | |
| 4535 Self->OnList = intptr_t(Lock) ; | |
| 4536 // The following fence() isn't _strictly necessary as the subsequent | |
| 4537 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4538 OrderAccess::fence(); | |
| 4539 for (;;) { | |
| 4540 w = *Lock ; | |
| 4541 if ((w & LOCKBIT) == 0) { | |
| 4542 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4543 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4544 return ; | |
| 4545 } | |
| 4546 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4547 } |
| 1878 | 4548 assert (w & LOCKBIT, "invariant") ; |
| 4549 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4550 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4551 } | |
| 4552 | |
| 4553 while (Self->OnList != 0) { | |
| 4554 Self->park() ; | |
| 4555 } | |
| 0 | 4556 } |
| 4557 } | |
| 4558 | |
| 1878 | 4559 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4560 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4561 if (w == 0) return ; | |
| 4562 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4563 return ; | |
| 4564 } | |
| 4565 | |
| 4566 TEVENT (muxAcquire - Contention) ; | |
| 4567 ParkEvent * ReleaseAfter = NULL ; | |
| 4568 if (ev == NULL) { | |
| 4569 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4570 } | |
| 4571 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4572 for (;;) { | |
| 4573 guarantee (ev->OnList == 0, "invariant") ; | |
| 4574 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4575 | |
| 4576 // Optional spin phase: spin-then-park strategy | |
| 4577 while (--its >= 0) { | |
| 4578 w = *Lock ; | |
| 4579 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4580 if (ReleaseAfter != NULL) { | |
| 4581 ParkEvent::Release (ReleaseAfter) ; | |
| 4582 } | |
| 4583 return ; | |
| 4584 } | |
| 4585 } | |
| 4586 | |
| 4587 ev->reset() ; | |
| 4588 ev->OnList = intptr_t(Lock) ; | |
| 4589 // The following fence() isn't _strictly necessary as the subsequent | |
| 4590 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4591 OrderAccess::fence(); | |
| 4592 for (;;) { | |
| 4593 w = *Lock ; | |
| 4594 if ((w & LOCKBIT) == 0) { | |
| 4595 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4596 ev->OnList = 0 ; | |
| 4597 // We call ::Release while holding the outer lock, thus | |
| 4598 // artificially lengthening the critical section. | |
| 4599 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4600 // after we've dropped the outer lock. | |
| 4601 if (ReleaseAfter != NULL) { | |
| 4602 ParkEvent::Release (ReleaseAfter) ; | |
| 4603 } | |
| 4604 return ; | |
| 4605 } | |
| 4606 continue ; // Interference -- *Lock changed -- Just retry | |
| 4607 } | |
| 4608 assert (w & LOCKBIT, "invariant") ; | |
| 4609 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4610 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4611 } | |
| 4612 | |
| 4613 while (ev->OnList != 0) { | |
| 4614 ev->park() ; | |
| 4615 } | |
| 4616 } | |
| 4617 } | |
| 4618 | |
| 4619 // Release() must extract a successor from the list and then wake that thread. | |
| 4620 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4621 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4622 // Release() would : | |
| 4623 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4624 // (B) Extract a successor from the private list "in-hand" | |
| 4625 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4626 // If there were any newly arrived threads and the CAS() would fail. | |
| 4627 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4628 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4629 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4630 // The wakee would be responsible for reattaching and remerging before it | |
| 4631 // competed for the lock. | |
| 4632 // | |
| 4633 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4634 // multiple concurrent pushers, but only one popper or detacher. | |
| 4635 // This implementation pops from the head of the list. This is unfair, | |
| 4636 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4637 // (We wake recently run threads first). | |
| 4638 | |
| 4639 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4640 for (;;) { | |
| 4641 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4642 assert (w & LOCKBIT, "invariant") ; | |
| 4643 if (w == LOCKBIT) return ; | |
| 4644 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4645 assert (List != NULL, "invariant") ; | |
| 4646 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4647 ParkEvent * nxt = List->ListNext ; | |
| 4648 | |
| 4649 // The following CAS() releases the lock and pops the head element. | |
| 4650 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4651 continue ; | |
| 4652 } | |
| 4653 List->OnList = 0 ; | |
| 4654 OrderAccess::fence() ; | |
| 4655 List->unpark () ; | |
| 4656 return ; | |
| 4657 } | |
| 4658 } | |
| 4659 | |
| 4660 | |
| 0 | 4661 void Threads::verify() { |
| 4662 ALL_JAVA_THREADS(p) { | |
| 4663 p->verify(); | |
| 4664 } | |
| 4665 VMThread* thread = VMThread::vm_thread(); | |
| 4666 if (thread != NULL) thread->verify(); | |
| 4667 } |