Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 6769:c088e2e95e69
Merge
| author | zgu |
|---|---|
| date | Mon, 17 Sep 2012 13:34:07 -0700 |
| parents | 716e6ef4482a a7509aff1b06 |
| children | c3e799c37717 fb19af007ffc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 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/aprofiler.hpp" | |
| 49 #include "runtime/arguments.hpp" | |
| 50 #include "runtime/biasedLocking.hpp" | |
| 51 #include "runtime/deoptimization.hpp" | |
| 52 #include "runtime/fprofiler.hpp" | |
| 53 #include "runtime/frame.inline.hpp" | |
| 54 #include "runtime/init.hpp" | |
| 55 #include "runtime/interfaceSupport.hpp" | |
| 56 #include "runtime/java.hpp" | |
| 57 #include "runtime/javaCalls.hpp" | |
| 58 #include "runtime/jniPeriodicChecker.hpp" | |
| 59 #include "runtime/memprofiler.hpp" | |
| 60 #include "runtime/mutexLocker.hpp" | |
| 61 #include "runtime/objectMonitor.hpp" | |
| 62 #include "runtime/osThread.hpp" | |
| 63 #include "runtime/safepoint.hpp" | |
| 64 #include "runtime/sharedRuntime.hpp" | |
| 65 #include "runtime/statSampler.hpp" | |
| 66 #include "runtime/stubRoutines.hpp" | |
| 67 #include "runtime/task.hpp" | |
| 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" |
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79 #include "trace/traceEventTypes.hpp" |
| 1972 | 80 #include "utilities/defaultStream.hpp" |
| 81 #include "utilities/dtrace.hpp" | |
| 82 #include "utilities/events.hpp" | |
| 83 #include "utilities/preserveException.hpp" | |
| 84 #ifdef TARGET_OS_FAMILY_linux | |
| 85 # include "os_linux.inline.hpp" | |
| 86 # include "thread_linux.inline.hpp" | |
| 87 #endif | |
| 88 #ifdef TARGET_OS_FAMILY_solaris | |
| 89 # include "os_solaris.inline.hpp" | |
| 90 # include "thread_solaris.inline.hpp" | |
| 91 #endif | |
| 92 #ifdef TARGET_OS_FAMILY_windows | |
| 93 # include "os_windows.inline.hpp" | |
| 94 # include "thread_windows.inline.hpp" | |
| 95 #endif | |
| 3960 | 96 #ifdef TARGET_OS_FAMILY_bsd |
| 97 # include "os_bsd.inline.hpp" | |
| 98 # include "thread_bsd.inline.hpp" | |
| 99 #endif | |
| 1972 | 100 #ifndef SERIALGC |
| 101 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 102 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 103 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 104 #endif | |
| 105 #ifdef COMPILER1 | |
| 106 #include "c1/c1_Compiler.hpp" | |
| 107 #endif | |
| 108 #ifdef COMPILER2 | |
| 109 #include "opto/c2compiler.hpp" | |
| 110 #include "opto/idealGraphPrinter.hpp" | |
| 111 #endif | |
| 0 | 112 |
| 113 #ifdef DTRACE_ENABLED | |
| 114 | |
| 115 // Only bother with this argument setup if dtrace is available | |
| 116 | |
| 4006 | 117 #ifndef USDT2 |
| 0 | 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 120 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 121 intptr_t, intptr_t, bool); | |
| 122 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 123 intptr_t, intptr_t, bool); | |
| 124 | |
| 125 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 126 { \ | |
| 127 ResourceMark rm(this); \ | |
| 128 int len = 0; \ | |
| 129 const char* name = (javathread)->get_thread_name(); \ | |
| 130 len = strlen(name); \ | |
| 131 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 132 name, len, \ | |
| 133 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 134 (javathread)->osthread()->thread_id(), \ | |
| 135 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 136 } | |
| 137 | |
| 4006 | 138 #else /* USDT2 */ |
| 139 | |
| 140 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 141 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 142 | |
| 143 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 144 { \ | |
| 145 ResourceMark rm(this); \ | |
| 146 int len = 0; \ | |
| 147 const char* name = (javathread)->get_thread_name(); \ | |
| 148 len = strlen(name); \ | |
| 149 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 150 (char *) name, len, \ | |
| 151 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 152 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 153 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 154 } | |
| 155 | |
| 156 #endif /* USDT2 */ | |
| 157 | |
| 0 | 158 #else // ndef DTRACE_ENABLED |
| 159 | |
| 160 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 161 | |
| 162 #endif // ndef DTRACE_ENABLED | |
| 163 | |
| 6197 | 164 |
| 0 | 165 // Class hierarchy |
| 166 // - Thread | |
| 167 // - VMThread | |
| 168 // - WatcherThread | |
| 169 // - ConcurrentMarkSweepThread | |
| 170 // - JavaThread | |
| 171 // - CompilerThread | |
| 172 | |
| 173 // ======= Thread ======== | |
| 174 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 175 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 176 if (UseBiasedLocking) { |
| 177 const int alignment = markOopDesc::biased_lock_alignment; | |
| 178 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 179 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
| 180 : os::malloc(aligned_size, flags, CURRENT_PC); | |
| 0 | 181 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 182 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 183 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 184 "JavaThread alignment code overflowed allocated storage"); | |
| 185 if (TraceBiasedLocking) { | |
| 186 if (aligned_addr != real_malloc_addr) | |
| 187 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 188 real_malloc_addr, aligned_addr); | |
| 189 } | |
| 190 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 191 return aligned_addr; | |
| 192 } else { | |
| 6197 | 193 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
| 194 : os::malloc(size, flags, CURRENT_PC); | |
| 0 | 195 } |
| 196 } | |
| 197 | |
| 198 void Thread::operator delete(void* p) { | |
| 199 if (UseBiasedLocking) { | |
| 200 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 201 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 202 } else { |
| 6197 | 203 FreeHeap(p, mtThread); |
| 0 | 204 } |
| 205 } | |
| 206 | |
| 207 | |
| 208 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 209 // JavaThread | |
| 210 | |
| 211 | |
| 212 Thread::Thread() { | |
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213 // stack and get_thread |
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214 set_stack_base(NULL); |
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215 set_stack_size(0); |
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216 set_self_raw_id(0); |
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217 set_lgrp_id(-1); |
| 0 | 218 |
| 219 // allocated data structures | |
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220 set_osthread(NULL); |
| 6197 | 221 set_resource_area(new (mtThread)ResourceArea()); |
| 222 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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223 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, 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 | |
| 232 new HandleMark(this); | |
| 233 | |
| 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); |
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242 set_trace_buffer(NULL); |
| 0 | 243 _vm_operation_started_count = 0; |
| 244 _vm_operation_completed_count = 0; | |
| 245 _current_pending_monitor = NULL; | |
| 246 _current_pending_monitor_is_from_java = true; | |
| 247 _current_waiting_monitor = NULL; | |
| 248 _num_nested_signal = 0; | |
| 249 omFreeList = NULL ; | |
| 250 omFreeCount = 0 ; | |
| 251 omFreeProvision = 32 ; | |
| 1587 | 252 omInUseList = NULL ; |
| 253 omInUseCount = 0 ; | |
| 0 | 254 |
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255 #ifdef ASSERT |
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256 _visited_for_critical_count = false; |
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257 #endif |
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258 |
| 0 | 259 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 260 _suspend_flags = 0; | |
| 261 | |
| 262 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 263 _hashStateX = os::random() ; | |
| 264 _hashStateY = 842502087 ; | |
| 265 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 266 _hashStateW = 273326509 ; | |
| 267 | |
| 268 _OnTrap = 0 ; | |
| 269 _schedctl = NULL ; | |
| 270 _Stalled = 0 ; | |
| 271 _TypeTag = 0x2BAD ; | |
| 272 | |
| 273 // Many of the following fields are effectively final - immutable | |
| 274 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 275 // construct until the _MutexEvent is initialized ... | |
| 276 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 277 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 278 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 279 // and ::Release() | |
| 280 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 281 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 282 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 283 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 284 | |
| 285 #ifdef CHECK_UNHANDLED_OOPS | |
| 286 if (CheckUnhandledOops) { | |
| 287 _unhandled_oops = new UnhandledOops(this); | |
| 288 } | |
| 289 #endif // CHECK_UNHANDLED_OOPS | |
| 290 #ifdef ASSERT | |
| 291 if (UseBiasedLocking) { | |
| 292 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 293 assert(this == _real_malloc_address || | |
| 294 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 295 "bug in forced alignment of thread objects"); | |
| 296 } | |
| 297 #endif /* ASSERT */ | |
| 298 } | |
| 299 | |
| 300 void Thread::initialize_thread_local_storage() { | |
| 301 // Note: Make sure this method only calls | |
| 302 // non-blocking operations. Otherwise, it might not work | |
| 303 // with the thread-startup/safepoint interaction. | |
| 304 | |
| 305 // During Java thread startup, safepoint code should allow this | |
| 306 // method to complete because it may need to allocate memory to | |
| 307 // store information for the new thread. | |
| 308 | |
| 309 // initialize structure dependent on thread local storage | |
| 310 ThreadLocalStorage::set_thread(this); | |
| 311 } | |
| 312 | |
| 313 void Thread::record_stack_base_and_size() { | |
| 314 set_stack_base(os::current_stack_base()); | |
| 315 set_stack_size(os::current_stack_size()); | |
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316 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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317 // in initialize_thread(). Without the adjustment, stack size is |
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318 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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319 // So far, only Solaris has real implementation of initialize_thread(). |
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320 // |
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321 // set up any platform-specific state. |
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322 os::initialize_thread(this); |
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323 |
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324 // record thread's native stack, stack grows downward |
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325 if (MemTracker::is_on()) { |
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326 address stack_low_addr = stack_base() - stack_size(); |
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327 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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328 CURRENT_PC); |
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329 } |
| 0 | 330 } |
| 331 | |
| 332 | |
| 333 Thread::~Thread() { | |
| 334 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 335 ObjectSynchronizer::omFlush (this) ; | |
| 336 | |
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337 // stack_base can be NULL if the thread is never started or exited before |
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338 // record_stack_base_and_size called. Although, we would like to ensure |
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339 // that all started threads do call record_stack_base_and_size(), there is |
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340 // not proper way to enforce that. |
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341 if (_stack_base != NULL) { |
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342 address low_stack_addr = stack_base() - stack_size(); |
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343 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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344 } |
| 6197 | 345 |
| 0 | 346 // deallocate data structures |
| 347 delete resource_area(); | |
| 348 // since the handle marks are using the handle area, we have to deallocated the root | |
| 349 // handle mark before deallocating the thread's handle area, | |
| 350 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 351 delete last_handle_mark(); | |
| 352 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 353 | |
| 354 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 355 // We NULL out the fields for good hygiene. | |
| 356 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 357 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 358 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 359 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 360 | |
| 361 delete handle_area(); | |
|
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362 delete metadata_handles(); |
| 0 | 363 |
| 364 // osthread() can be NULL, if creation of thread failed. | |
| 365 if (osthread() != NULL) os::free_thread(osthread()); | |
| 366 | |
| 367 delete _SR_lock; | |
| 368 | |
| 369 // clear thread local storage if the Thread is deleting itself | |
| 370 if (this == Thread::current()) { | |
| 371 ThreadLocalStorage::set_thread(NULL); | |
| 372 } else { | |
| 373 // In the case where we're not the current thread, invalidate all the | |
| 374 // caches in case some code tries to get the current thread or the | |
| 375 // thread that was destroyed, and gets stale information. | |
| 376 ThreadLocalStorage::invalidate_all(); | |
| 377 } | |
| 378 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 379 } | |
| 380 | |
| 381 // NOTE: dummy function for assertion purpose. | |
| 382 void Thread::run() { | |
| 383 ShouldNotReachHere(); | |
| 384 } | |
| 385 | |
| 386 #ifdef ASSERT | |
| 387 // Private method to check for dangling thread pointer | |
| 388 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 389 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 390 "possibility of dangling Thread pointer"); | |
| 391 } | |
| 392 #endif | |
| 393 | |
| 394 | |
| 395 #ifndef PRODUCT | |
| 396 // Tracing method for basic thread operations | |
| 397 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 398 if (!TraceThreadEvents) return; | |
| 399 ResourceMark rm; | |
| 400 ThreadCritical tc; | |
| 401 const char *name = "non-Java thread"; | |
| 402 int prio = -1; | |
| 403 if (thread->is_Java_thread() | |
| 404 && !thread->is_Compiler_thread()) { | |
| 405 // The Threads_lock must be held to get information about | |
| 406 // this thread but may not be in some situations when | |
| 407 // tracing thread events. | |
| 408 bool release_Threads_lock = false; | |
| 409 if (!Threads_lock->owned_by_self()) { | |
| 410 Threads_lock->lock(); | |
| 411 release_Threads_lock = true; | |
| 412 } | |
| 413 JavaThread* jt = (JavaThread *)thread; | |
| 414 name = (char *)jt->get_thread_name(); | |
| 415 oop thread_oop = jt->threadObj(); | |
| 416 if (thread_oop != NULL) { | |
| 417 prio = java_lang_Thread::priority(thread_oop); | |
| 418 } | |
| 419 if (release_Threads_lock) { | |
| 420 Threads_lock->unlock(); | |
| 421 } | |
| 422 } | |
| 423 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 424 } | |
| 425 #endif | |
| 426 | |
| 427 | |
| 428 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 429 trace("get priority", thread); | |
| 430 ThreadPriority priority; | |
| 431 // Can return an error! | |
| 432 (void)os::get_priority(thread, priority); | |
| 433 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 434 return priority; | |
| 435 } | |
| 436 | |
| 437 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 438 trace("set priority", thread); | |
| 439 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 440 // Can return an error! | |
| 441 (void)os::set_priority(thread, priority); | |
| 442 } | |
| 443 | |
| 444 | |
| 445 void Thread::start(Thread* thread) { | |
| 446 trace("start", thread); | |
| 447 // Start is different from resume in that its safety is guaranteed by context or | |
| 448 // being called from a Java method synchronized on the Thread object. | |
| 449 if (!DisableStartThread) { | |
| 450 if (thread->is_Java_thread()) { | |
| 451 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 452 // Can not set it after the thread started because we do not know the | |
| 453 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 454 // in SLEEPING or some other state. | |
| 455 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 456 java_lang_Thread::RUNNABLE); | |
| 457 } | |
| 458 os::start_thread(thread); | |
| 459 } | |
| 460 } | |
| 461 | |
| 462 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 463 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 464 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 465 VMThread::execute(vm_stop); | |
| 466 } | |
| 467 | |
| 468 | |
| 469 // | |
| 470 // Check if an external suspend request has completed (or has been | |
| 471 // cancelled). Returns true if the thread is externally suspended and | |
| 472 // false otherwise. | |
| 473 // | |
| 474 // The bits parameter returns information about the code path through | |
| 475 // the routine. Useful for debugging: | |
| 476 // | |
| 477 // set in is_ext_suspend_completed(): | |
| 478 // 0x00000001 - routine was entered | |
| 479 // 0x00000010 - routine return false at end | |
| 480 // 0x00000100 - thread exited (return false) | |
| 481 // 0x00000200 - suspend request cancelled (return false) | |
| 482 // 0x00000400 - thread suspended (return true) | |
| 483 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 484 // 0x00002000 - thread is native and walkable (return true) | |
| 485 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 486 // | |
| 487 // set in wait_for_ext_suspend_completion(): | |
| 488 // 0x00010000 - routine was entered | |
| 489 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 490 // 0x00040000 - thread suspended before loop (return true) | |
| 491 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 492 // 0x00100000 - thread suspended in loop (return true) | |
| 493 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 494 // | |
| 495 | |
| 496 // Helper class for tracing suspend wait debug bits. | |
| 497 // | |
| 498 // 0x00000100 indicates that the target thread exited before it could | |
| 499 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 500 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 501 // count as wait failures either. | |
| 502 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 503 | |
| 504 class TraceSuspendDebugBits : public StackObj { | |
| 505 private: | |
| 506 JavaThread * jt; | |
| 507 bool is_wait; | |
| 508 bool called_by_wait; // meaningful when !is_wait | |
| 509 uint32_t * bits; | |
| 510 | |
| 511 public: | |
| 512 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 513 uint32_t *_bits) { | |
| 514 jt = _jt; | |
| 515 is_wait = _is_wait; | |
| 516 called_by_wait = _called_by_wait; | |
| 517 bits = _bits; | |
| 518 } | |
| 519 | |
| 520 ~TraceSuspendDebugBits() { | |
| 521 if (!is_wait) { | |
| 522 #if 1 | |
| 523 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 524 // That trace is very chatty. | |
| 525 return; | |
| 526 #else | |
| 527 if (!called_by_wait) { | |
| 528 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 529 // trace calls to it from wait_for_ext_suspend_completion() | |
| 530 return; | |
| 531 } | |
| 532 #endif | |
| 533 } | |
| 534 | |
| 535 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 536 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 537 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 538 ResourceMark rm; | |
| 539 | |
| 540 tty->print_cr( | |
| 541 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 542 jt->get_thread_name(), *bits); | |
| 543 | |
| 544 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 545 } | |
| 546 } | |
| 547 } | |
| 548 }; | |
| 549 #undef DEBUG_FALSE_BITS | |
| 550 | |
| 551 | |
| 552 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 553 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 554 | |
| 555 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 556 bool do_trans_retry; // flag to force the retry | |
| 557 | |
| 558 *bits |= 0x00000001; | |
| 559 | |
| 560 do { | |
| 561 do_trans_retry = false; | |
| 562 | |
| 563 if (is_exiting()) { | |
| 564 // Thread is in the process of exiting. This is always checked | |
| 565 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 566 *bits |= 0x00000100; | |
| 567 return false; | |
| 568 } | |
| 569 | |
| 570 if (!is_external_suspend()) { | |
| 571 // Suspend request is cancelled. This is always checked before | |
| 572 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 573 // confusing the thread that made the suspend request. | |
| 574 *bits |= 0x00000200; | |
| 575 return false; | |
| 576 } | |
| 577 | |
| 578 if (is_ext_suspended()) { | |
| 579 // thread is suspended | |
| 580 *bits |= 0x00000400; | |
| 581 return true; | |
| 582 } | |
| 583 | |
| 584 // Now that we no longer do hard suspends of threads running | |
| 585 // native code, the target thread can be changing thread state | |
| 586 // while we are in this routine: | |
| 587 // | |
| 588 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 589 // | |
| 590 // We save a copy of the thread state as observed at this moment | |
| 591 // and make our decision about suspend completeness based on the | |
| 592 // copy. This closes the race where the thread state is seen as | |
| 593 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 594 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 595 JavaThreadState save_state = thread_state(); | |
| 596 | |
| 597 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 598 // If the thread's state is _thread_blocked and this blocking | |
| 599 // condition is known to be equivalent to a suspend, then we can | |
| 600 // consider the thread to be externally suspended. This means that | |
| 601 // the code that sets _thread_blocked has been modified to do | |
| 602 // self-suspension if the blocking condition releases. We also | |
| 603 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 604 // the _thread_blocked with self-suspension check. | |
| 605 // | |
| 606 // Return true since we wouldn't be here unless there was still an | |
| 607 // external suspend request. | |
| 608 *bits |= 0x00001000; | |
| 609 return true; | |
| 610 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 611 // Threads running native code will self-suspend on native==>VM/Java | |
| 612 // transitions. If its stack is walkable (should always be the case | |
| 613 // unless this function is called before the actual java_suspend() | |
| 614 // call), then the wait is done. | |
| 615 *bits |= 0x00002000; | |
| 616 return true; | |
| 617 } else if (!called_by_wait && !did_trans_retry && | |
| 618 save_state == _thread_in_native_trans && | |
| 619 frame_anchor()->walkable()) { | |
| 620 // The thread is transitioning from thread_in_native to another | |
| 621 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 622 // will force the thread to self-suspend. If it hasn't gotten | |
| 623 // there yet we may have caught the thread in-between the native | |
| 624 // code check above and the self-suspend. Lucky us. If we were | |
| 625 // called by wait_for_ext_suspend_completion(), then it | |
| 626 // will be doing the retries so we don't have to. | |
| 627 // | |
| 628 // Since we use the saved thread state in the if-statement above, | |
| 629 // there is a chance that the thread has already transitioned to | |
| 630 // _thread_blocked by the time we get here. In that case, we will | |
| 631 // make a single unnecessary pass through the logic below. This | |
| 632 // doesn't hurt anything since we still do the trans retry. | |
| 633 | |
| 634 *bits |= 0x00004000; | |
| 635 | |
| 636 // Once the thread leaves thread_in_native_trans for another | |
| 637 // thread state, we break out of this retry loop. We shouldn't | |
| 638 // need this flag to prevent us from getting back here, but | |
| 639 // sometimes paranoia is good. | |
| 640 did_trans_retry = true; | |
| 641 | |
| 642 // We wait for the thread to transition to a more usable state. | |
| 643 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 644 // We used to do an "os::yield_all(i)" call here with the intention | |
| 645 // that yielding would increase on each retry. However, the parameter | |
| 646 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 647 // on the SR_lock below provides a much more predictable scale up for | |
| 648 // the delay. It also provides a simple/direct point to check for any | |
| 649 // safepoint requests from the VMThread | |
| 650 | |
| 651 // temporarily drops SR_lock while doing wait with safepoint check | |
| 652 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 653 // and increase delay with each retry | |
| 654 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 655 | |
| 656 // check the actual thread state instead of what we saved above | |
| 657 if (thread_state() != _thread_in_native_trans) { | |
| 658 // the thread has transitioned to another thread state so | |
| 659 // try all the checks (except this one) one more time. | |
| 660 do_trans_retry = true; | |
| 661 break; | |
| 662 } | |
| 663 } // end retry loop | |
| 664 | |
| 665 | |
| 666 } | |
| 667 } while (do_trans_retry); | |
| 668 | |
| 669 *bits |= 0x00000010; | |
| 670 return false; | |
| 671 } | |
| 672 | |
| 673 // | |
| 674 // Wait for an external suspend request to complete (or be cancelled). | |
| 675 // Returns true if the thread is externally suspended and false otherwise. | |
| 676 // | |
| 677 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 678 uint32_t *bits) { | |
| 679 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 680 false /* !called_by_wait */, bits); | |
| 681 | |
| 682 // local flag copies to minimize SR_lock hold time | |
| 683 bool is_suspended; | |
| 684 bool pending; | |
| 685 uint32_t reset_bits; | |
| 686 | |
| 687 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 688 *bits |= 0x00010000; | |
| 689 | |
| 690 // We use reset_bits to reinitialize the bits value at the top of | |
| 691 // each retry loop. This allows the caller to make use of any | |
| 692 // unused bits for their own marking purposes. | |
| 693 reset_bits = *bits; | |
| 694 | |
| 695 { | |
| 696 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 697 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 698 delay, bits); | |
| 699 pending = is_external_suspend(); | |
| 700 } | |
| 701 // must release SR_lock to allow suspension to complete | |
| 702 | |
| 703 if (!pending) { | |
| 704 // A cancelled suspend request is the only false return from | |
| 705 // is_ext_suspend_completed() that keeps us from entering the | |
| 706 // retry loop. | |
| 707 *bits |= 0x00020000; | |
| 708 return false; | |
| 709 } | |
| 710 | |
| 711 if (is_suspended) { | |
| 712 *bits |= 0x00040000; | |
| 713 return true; | |
| 714 } | |
| 715 | |
| 716 for (int i = 1; i <= retries; i++) { | |
| 717 *bits = reset_bits; // reinit to only track last retry | |
| 718 | |
| 719 // We used to do an "os::yield_all(i)" call here with the intention | |
| 720 // that yielding would increase on each retry. However, the parameter | |
| 721 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 722 // on the SR_lock below provides a much more predictable scale up for | |
| 723 // the delay. It also provides a simple/direct point to check for any | |
| 724 // safepoint requests from the VMThread | |
| 725 | |
| 726 { | |
| 727 MutexLocker ml(SR_lock()); | |
| 728 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 729 // can also call this) and increase delay with each retry | |
| 730 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 731 | |
| 732 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 733 delay, bits); | |
| 734 | |
| 735 // It is possible for the external suspend request to be cancelled | |
| 736 // (by a resume) before the actual suspend operation is completed. | |
| 737 // Refresh our local copy to see if we still need to wait. | |
| 738 pending = is_external_suspend(); | |
| 739 } | |
| 740 | |
| 741 if (!pending) { | |
| 742 // A cancelled suspend request is the only false return from | |
| 743 // is_ext_suspend_completed() that keeps us from staying in the | |
| 744 // retry loop. | |
| 745 *bits |= 0x00080000; | |
| 746 return false; | |
| 747 } | |
| 748 | |
| 749 if (is_suspended) { | |
| 750 *bits |= 0x00100000; | |
| 751 return true; | |
| 752 } | |
| 753 } // end retry loop | |
| 754 | |
| 755 // thread did not suspend after all our retries | |
| 756 *bits |= 0x00200000; | |
| 757 return false; | |
| 758 } | |
| 759 | |
| 760 #ifndef PRODUCT | |
| 761 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 762 | |
| 763 // This should not need to be atomic as the only way for simultaneous | |
| 764 // updates is via interrupts. Even then this should be rare or non-existant | |
| 765 // and we don't care that much anyway. | |
| 766 | |
| 767 int index = _jmp_ring_index; | |
| 768 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 769 _jmp_ring[index]._target = (intptr_t) target; | |
| 770 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 771 _jmp_ring[index]._file = file; | |
| 772 _jmp_ring[index]._line = line; | |
| 773 } | |
| 774 #endif /* PRODUCT */ | |
| 775 | |
| 776 // Called by flat profiler | |
| 777 // Callers have already called wait_for_ext_suspend_completion | |
| 778 // The assertion for that is currently too complex to put here: | |
| 779 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 780 bool gotframe = false; | |
| 781 // self suspension saves needed state. | |
| 782 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 783 *_fr = pd_last_frame(); | |
| 784 gotframe = true; | |
| 785 } | |
| 786 return gotframe; | |
| 787 } | |
| 788 | |
| 789 void Thread::interrupt(Thread* thread) { | |
| 790 trace("interrupt", thread); | |
| 791 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 792 os::interrupt(thread); | |
| 793 } | |
| 794 | |
| 795 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 796 trace("is_interrupted", thread); | |
| 797 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 798 // Note: If clear_interrupted==false, this simply fetches and | |
| 799 // returns the value of the field osthread()->interrupted(). | |
| 800 return os::is_interrupted(thread, clear_interrupted); | |
| 801 } | |
| 802 | |
| 803 | |
| 804 // GC Support | |
| 805 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 806 jint thread_parity = _oops_do_parity; | |
| 807 if (thread_parity != strong_roots_parity) { | |
| 808 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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809 if (res == thread_parity) { |
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810 return true; |
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811 } else { |
| 0 | 812 guarantee(res == strong_roots_parity, "Or else what?"); |
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813 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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814 "Should only fail when parallel."); |
| 0 | 815 return false; |
| 816 } | |
| 817 } | |
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818 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 819 "Should only fail when parallel."); |
| 820 return false; | |
| 821 } | |
| 822 | |
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823 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 824 active_handles()->oops_do(f); |
| 825 // Do oop for ThreadShadow | |
| 826 f->do_oop((oop*)&_pending_exception); | |
| 827 handle_area()->oops_do(f); | |
| 828 } | |
| 829 | |
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830 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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831 // no nmethods in a generic thread... |
| 0 | 832 } |
| 833 | |
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834 void Thread::metadata_do(void f(Metadata*)) { |
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835 if (metadata_handles() != NULL) { |
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836 for (int i = 0; i< metadata_handles()->length(); i++) { |
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837 f(metadata_handles()->at(i)); |
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838 } |
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839 } |
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840 } |
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841 |
| 0 | 842 void Thread::print_on(outputStream* st) const { |
| 843 // get_priority assumes osthread initialized | |
| 844 if (osthread() != NULL) { | |
| 6766 | 845 int os_prio; |
| 846 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 847 st->print("os_prio=%d ", os_prio); | |
| 848 } | |
| 849 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 850 osthread()->print_on(st); |
| 851 } | |
| 852 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 853 } | |
| 854 | |
| 855 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 856 // any lock or allocate memory. | |
| 857 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 858 if (is_VM_thread()) st->print("VMThread"); | |
| 859 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 860 else if (is_Java_thread()) st->print("JavaThread"); | |
| 861 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 862 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 863 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 864 else st->print("Thread"); | |
| 865 | |
| 866 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 867 _stack_base - _stack_size, _stack_base); | |
| 868 | |
| 869 if (osthread()) { | |
| 870 st->print(" [id=%d]", osthread()->thread_id()); | |
| 871 } | |
| 872 } | |
| 873 | |
| 874 #ifdef ASSERT | |
| 875 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 876 Monitor *cur = _owned_locks; | |
| 877 if (cur == NULL) { | |
| 878 st->print(" (no locks) "); | |
| 879 } else { | |
| 880 st->print_cr(" Locks owned:"); | |
| 881 while(cur) { | |
| 882 cur->print_on(st); | |
| 883 cur = cur->next(); | |
| 884 } | |
| 885 } | |
| 886 } | |
| 887 | |
| 888 static int ref_use_count = 0; | |
| 889 | |
| 890 bool Thread::owns_locks_but_compiled_lock() const { | |
| 891 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 892 if (cur != Compile_lock) return true; | |
| 893 } | |
| 894 return false; | |
| 895 } | |
| 896 | |
| 897 | |
| 898 #endif | |
| 899 | |
| 900 #ifndef PRODUCT | |
| 901 | |
| 902 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 903 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 904 // no threads which allow_vm_block's are held | |
| 905 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 906 // Check if current thread is allowed to block at a safepoint | |
| 907 if (!(_allow_safepoint_count == 0)) | |
| 908 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 909 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 910 fatal("LEAF method calling lock?"); | |
| 911 } | |
| 912 | |
| 913 #ifdef ASSERT | |
| 914 if (potential_vm_operation && is_Java_thread() | |
| 915 && !Universe::is_bootstrapping()) { | |
| 916 // Make sure we do not hold any locks that the VM thread also uses. | |
| 917 // This could potentially lead to deadlocks | |
| 918 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 919 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 920 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 921 // since it is used to transfer control between JavaThreads and the VMThread | |
| 922 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 923 if ( (cur->allow_vm_block() && | |
| 924 cur != Threads_lock && | |
| 925 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 926 cur != VMOperationRequest_lock && | |
| 927 cur != VMOperationQueue_lock) || | |
| 928 cur->rank() == Mutex::special) { | |
| 929 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 930 } | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 if (GCALotAtAllSafepoints) { | |
| 935 // We could enter a safepoint here and thus have a gc | |
| 936 InterfaceSupport::check_gc_alot(); | |
| 937 } | |
| 938 #endif | |
| 939 } | |
| 940 #endif | |
| 941 | |
| 942 bool Thread::is_in_stack(address adr) const { | |
| 943 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 944 address end = os::current_stack_pointer(); | |
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945 // Allow non Java threads to call this without stack_base |
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946 if (_stack_base == NULL) return true; |
| 0 | 947 if (stack_base() >= adr && adr >= end) return true; |
| 948 | |
| 949 return false; | |
| 950 } | |
| 951 | |
| 952 | |
| 953 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 954 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 955 // used for compilation in the future. If that change is made, the need for these methods | |
| 956 // should be revisited, and they should be removed if possible. | |
| 957 | |
| 958 bool Thread::is_lock_owned(address adr) const { | |
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959 return on_local_stack(adr); |
| 0 | 960 } |
| 961 | |
| 962 bool Thread::set_as_starting_thread() { | |
| 963 // NOTE: this must be called inside the main thread. | |
| 964 return os::create_main_thread((JavaThread*)this); | |
| 965 } | |
| 966 | |
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967 static void initialize_class(Symbol* class_name, TRAPS) { |
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968 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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969 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 970 } |
| 971 | |
| 972 | |
| 973 // Creates the initial ThreadGroup | |
| 974 static Handle create_initial_thread_group(TRAPS) { | |
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975 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 976 instanceKlassHandle klass (THREAD, k); |
| 977 | |
| 978 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 979 { | |
| 980 JavaValue result(T_VOID); | |
| 981 JavaCalls::call_special(&result, | |
| 982 system_instance, | |
| 983 klass, | |
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984 vmSymbols::object_initializer_name(), |
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985 vmSymbols::void_method_signature(), |
| 0 | 986 CHECK_NH); |
| 987 } | |
| 988 Universe::set_system_thread_group(system_instance()); | |
| 989 | |
| 990 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 991 { | |
| 992 JavaValue result(T_VOID); | |
| 993 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 994 JavaCalls::call_special(&result, | |
| 995 main_instance, | |
| 996 klass, | |
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997 vmSymbols::object_initializer_name(), |
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998 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 999 system_instance, |
| 1000 string, | |
| 1001 CHECK_NH); | |
| 1002 } | |
| 1003 return main_instance; | |
| 1004 } | |
| 1005 | |
| 1006 // Creates the initial Thread | |
| 1007 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1008 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1009 instanceKlassHandle klass (THREAD, k); |
| 1010 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1011 | |
| 1012 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1013 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1014 thread->set_threadObj(thread_oop()); | |
| 1015 | |
| 1016 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1017 | |
| 1018 JavaValue result(T_VOID); | |
| 1019 JavaCalls::call_special(&result, thread_oop, | |
| 1020 klass, | |
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1021 vmSymbols::object_initializer_name(), |
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1022 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1023 thread_group, |
| 1024 string, | |
| 1025 CHECK_NULL); | |
| 1026 return thread_oop(); | |
| 1027 } | |
| 1028 | |
| 1029 static void call_initializeSystemClass(TRAPS) { | |
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1030 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1031 instanceKlassHandle klass (THREAD, k); |
| 1032 | |
| 1033 JavaValue result(T_VOID); | |
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1034 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1035 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1036 } |
| 1037 | |
| 6181 | 1038 char java_runtime_name[128] = ""; |
| 1039 | |
| 1040 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1041 static const char* get_java_runtime_name(TRAPS) { | |
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1042 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1043 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1044 fieldDescriptor fd; | |
| 1045 bool found = k != NULL && | |
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1046 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1047 vmSymbols::string_signature(), &fd); |
| 1048 if (found) { | |
| 1049 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1050 if (name_oop == NULL) | |
| 1051 return NULL; | |
| 1052 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1053 java_runtime_name, | |
| 1054 sizeof(java_runtime_name)); | |
| 1055 return name; | |
| 1056 } else { | |
| 1057 return NULL; | |
| 1058 } | |
| 1059 } | |
| 1060 | |
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1061 // General purpose hook into Java code, run once when the VM is initialized. |
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1062 // The Java library method itself may be changed independently from the VM. |
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1063 static void call_postVMInitHook(TRAPS) { |
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1064 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1065 instanceKlassHandle klass (THREAD, k); |
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1066 if (klass.not_null()) { |
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1067 JavaValue result(T_VOID); |
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1068 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1069 vmSymbols::void_method_signature(), |
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1070 CHECK); |
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1071 } |
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1072 } |
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1073 |
| 0 | 1074 static void reset_vm_info_property(TRAPS) { |
| 1075 // the vm info string | |
| 1076 ResourceMark rm(THREAD); | |
| 1077 const char *vm_info = VM_Version::vm_info_string(); | |
| 1078 | |
| 1079 // java.lang.System class | |
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1080 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1081 instanceKlassHandle klass (THREAD, k); |
| 1082 | |
| 1083 // setProperty arguments | |
| 1084 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1085 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1086 | |
| 1087 // return value | |
| 1088 JavaValue r(T_OBJECT); | |
| 1089 | |
| 1090 // public static String setProperty(String key, String value); | |
| 1091 JavaCalls::call_static(&r, | |
| 1092 klass, | |
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1093 vmSymbols::setProperty_name(), |
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1094 vmSymbols::string_string_string_signature(), |
| 0 | 1095 key_str, |
| 1096 value_str, | |
| 1097 CHECK); | |
| 1098 } | |
| 1099 | |
| 1100 | |
| 1101 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1102 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1103 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1104 | |
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1105 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1106 instanceKlassHandle klass (THREAD, k); |
| 1107 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1108 | |
| 1109 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1110 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1111 set_threadObj(thread_oop()); | |
| 1112 | |
| 1113 JavaValue result(T_VOID); | |
| 1114 if (thread_name != NULL) { | |
| 1115 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1116 // Thread gets assigned specified name and null target | |
| 1117 JavaCalls::call_special(&result, | |
| 1118 thread_oop, | |
| 1119 klass, | |
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1120 vmSymbols::object_initializer_name(), |
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1121 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1122 thread_group, // Argument 1 |
| 1123 name, // Argument 2 | |
| 1124 THREAD); | |
| 1125 } else { | |
| 1126 // Thread gets assigned name "Thread-nnn" and null target | |
| 1127 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1128 JavaCalls::call_special(&result, | |
| 1129 thread_oop, | |
| 1130 klass, | |
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1131 vmSymbols::object_initializer_name(), |
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1132 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1133 thread_group, // Argument 1 |
| 1134 Handle(), // Argument 2 | |
| 1135 THREAD); | |
| 1136 } | |
| 1137 | |
| 1138 | |
| 1139 if (daemon) { | |
| 1140 java_lang_Thread::set_daemon(thread_oop()); | |
| 1141 } | |
| 1142 | |
| 1143 if (HAS_PENDING_EXCEPTION) { | |
| 1144 return; | |
| 1145 } | |
| 1146 | |
| 1142 | 1147 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1148 Handle threadObj(this, this->threadObj()); |
| 1149 | |
| 1150 JavaCalls::call_special(&result, | |
| 1151 thread_group, | |
| 1152 group, | |
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1153 vmSymbols::add_method_name(), |
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1154 vmSymbols::thread_void_signature(), |
| 0 | 1155 threadObj, // Arg 1 |
| 1156 THREAD); | |
| 1157 | |
| 1158 | |
| 1159 } | |
| 1160 | |
| 1161 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1162 // uniquely named instances should derive from this. | |
| 1163 NamedThread::NamedThread() : Thread() { | |
| 1164 _name = NULL; | |
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1165 _processed_thread = NULL; |
| 0 | 1166 } |
| 1167 | |
| 1168 NamedThread::~NamedThread() { | |
| 1169 if (_name != NULL) { | |
| 6197 | 1170 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1171 _name = NULL; |
| 1172 } | |
| 1173 } | |
| 1174 | |
| 1175 void NamedThread::set_name(const char* format, ...) { | |
| 1176 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1177 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1178 guarantee(_name != NULL, "alloc failure"); |
| 1179 va_list ap; | |
| 1180 va_start(ap, format); | |
| 1181 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1182 va_end(ap); | |
| 1183 } | |
| 1184 | |
| 1185 // ======= WatcherThread ======== | |
| 1186 | |
| 1187 // The watcher thread exists to simulate timer interrupts. It should | |
| 1188 // be replaced by an abstraction over whatever native support for | |
| 1189 // timer interrupts exists on the platform. | |
| 1190 | |
| 1191 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1192 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1193 |
| 1194 WatcherThread::WatcherThread() : Thread() { | |
| 1195 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1196 if (os::create_thread(this, os::watcher_thread)) { | |
| 1197 _watcher_thread = this; | |
| 1198 | |
| 1199 // Set the watcher thread to the highest OS priority which should not be | |
| 1200 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1201 // is created. The only normal thread using this priority is the reference | |
| 1202 // handler thread, which runs for very short intervals only. | |
| 1203 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1204 // will be inaccurate. | |
| 1205 os::set_priority(this, MaxPriority); | |
| 1206 if (!DisableStartThread) { | |
| 1207 os::start_thread(this); | |
| 1208 } | |
| 1209 } | |
| 1210 } | |
| 1211 | |
| 1212 void WatcherThread::run() { | |
| 1213 assert(this == watcher_thread(), "just checking"); | |
| 1214 | |
| 1215 this->record_stack_base_and_size(); | |
| 1216 this->initialize_thread_local_storage(); | |
| 1217 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1218 while(!_should_terminate) { | |
| 1219 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1220 assert(watcher_thread() == this, "thread consistency check"); | |
| 1221 | |
| 1222 // Calculate how long it'll be until the next PeriodicTask work | |
| 1223 // should be done, and sleep that amount of time. | |
|
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1224 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1225 |
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1226 // we expect this to timeout - we only ever get unparked when |
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1227 // we should terminate |
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1228 { |
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1229 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1230 |
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1231 jlong prev_time = os::javaTimeNanos(); |
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1232 for (;;) { |
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1233 int res= _SleepEvent->park(time_to_wait); |
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1234 if (res == OS_TIMEOUT || _should_terminate) |
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1235 break; |
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1236 // spurious wakeup of some kind |
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1237 jlong now = os::javaTimeNanos(); |
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1238 time_to_wait -= (now - prev_time) / 1000000; |
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1239 if (time_to_wait <= 0) |
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1240 break; |
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1241 prev_time = now; |
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1242 } |
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1243 } |
| 0 | 1244 |
| 1245 if (is_error_reported()) { | |
| 1246 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1247 // should abort JVM after creating an error log file. However in some | |
| 1248 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1249 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1250 // | |
| 1251 // This code is in WatcherThread because WatcherThread wakes up | |
| 1252 // periodically so the fatal error handler doesn't need to do anything; | |
| 1253 // also because the WatcherThread is less likely to crash than other | |
| 1254 // threads. | |
| 1255 | |
| 1256 for (;;) { | |
| 1257 if (!ShowMessageBoxOnError | |
| 1258 && (OnError == NULL || OnError[0] == '\0') | |
| 1259 && Arguments::abort_hook() == NULL) { | |
| 1260 os::sleep(this, 2 * 60 * 1000, false); | |
| 1261 fdStream err(defaultStream::output_fd()); | |
| 1262 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1263 // skip atexit/vm_exit/vm_abort hooks | |
| 1264 os::die(); | |
| 1265 } | |
| 1266 | |
| 1267 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1268 // ShowMessageBoxOnError when it is ready to abort. | |
| 1269 os::sleep(this, 5 * 1000, false); | |
| 1270 } | |
| 1271 } | |
| 1272 | |
| 1273 PeriodicTask::real_time_tick(time_to_wait); | |
| 1274 | |
| 1275 // If we have no more tasks left due to dynamic disenrollment, | |
| 1276 // shut down the thread since we don't currently support dynamic enrollment | |
| 1277 if (PeriodicTask::num_tasks() == 0) { | |
| 1278 _should_terminate = true; | |
| 1279 } | |
| 1280 } | |
| 1281 | |
| 1282 // Signal that it is terminated | |
| 1283 { | |
| 1284 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1285 _watcher_thread = NULL; | |
| 1286 Terminator_lock->notify(); | |
| 1287 } | |
| 1288 | |
| 1289 // Thread destructor usually does this.. | |
| 1290 ThreadLocalStorage::set_thread(NULL); | |
| 1291 } | |
| 1292 | |
| 1293 void WatcherThread::start() { | |
| 1294 if (watcher_thread() == NULL) { | |
| 1295 _should_terminate = false; | |
| 1296 // Create the single instance of WatcherThread | |
| 1297 new WatcherThread(); | |
| 1298 } | |
| 1299 } | |
| 1300 | |
| 1301 void WatcherThread::stop() { | |
| 1302 // it is ok to take late safepoints here, if needed | |
| 1303 MutexLocker mu(Terminator_lock); | |
| 1304 _should_terminate = true; | |
|
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1305 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1306 |
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1307 Thread* watcher = watcher_thread(); |
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1308 if (watcher != NULL) |
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1309 watcher->_SleepEvent->unpark(); |
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1310 |
| 0 | 1311 while(watcher_thread() != NULL) { |
| 1312 // This wait should make safepoint checks, wait without a timeout, | |
| 1313 // and wait as a suspend-equivalent condition. | |
| 1314 // | |
| 1315 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1316 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1317 // FlatProfiler task, is waiting for the external suspend request on | |
| 1318 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1319 // eventually timeout, but that takes time. Making this wait a | |
| 1320 // suspend-equivalent condition solves that timeout problem. | |
| 1321 // | |
| 1322 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1323 Mutex::_as_suspend_equivalent_flag); | |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 void WatcherThread::print_on(outputStream* st) const { | |
| 1328 st->print("\"%s\" ", name()); | |
| 1329 Thread::print_on(st); | |
| 1330 st->cr(); | |
| 1331 } | |
| 1332 | |
| 1333 // ======= JavaThread ======== | |
| 1334 | |
| 1335 // A JavaThread is a normal Java thread | |
| 1336 | |
| 1337 void JavaThread::initialize() { | |
| 1338 // Initialize fields | |
|
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1339 |
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1340 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1341 set_claimed_par_id(-1); |
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1342 |
| 0 | 1343 set_saved_exception_pc(NULL); |
| 1344 set_threadObj(NULL); | |
| 1345 _anchor.clear(); | |
| 1346 set_entry_point(NULL); | |
| 1347 set_jni_functions(jni_functions()); | |
| 1348 set_callee_target(NULL); | |
| 1349 set_vm_result(NULL); | |
| 1350 set_vm_result_2(NULL); | |
| 1351 set_vframe_array_head(NULL); | |
| 1352 set_vframe_array_last(NULL); | |
| 1353 set_deferred_locals(NULL); | |
| 1354 set_deopt_mark(NULL); | |
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1355 set_deopt_nmethod(NULL); |
| 0 | 1356 clear_must_deopt_id(); |
| 1357 set_monitor_chunks(NULL); | |
| 1358 set_next(NULL); | |
| 1359 set_thread_state(_thread_new); | |
| 6197 | 1360 set_recorder(NULL); |
| 0 | 1361 _terminated = _not_terminated; |
| 1362 _privileged_stack_top = NULL; | |
| 1363 _array_for_gc = NULL; | |
| 1364 _suspend_equivalent = false; | |
| 1365 _in_deopt_handler = 0; | |
| 1366 _doing_unsafe_access = false; | |
| 1367 _stack_guard_state = stack_guard_unused; | |
| 1368 _exception_oop = NULL; | |
| 1369 _exception_pc = 0; | |
| 1370 _exception_handler_pc = 0; | |
| 1903 | 1371 _is_method_handle_return = 0; |
| 0 | 1372 _jvmti_thread_state= NULL; |
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1373 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1374 _jvmti_get_loaded_classes_closure = NULL; |
| 1375 _interp_only_mode = 0; | |
| 1376 _special_runtime_exit_condition = _no_async_condition; | |
| 1377 _pending_async_exception = NULL; | |
| 1378 _is_compiling = false; | |
| 1379 _thread_stat = NULL; | |
| 1380 _thread_stat = new ThreadStatistics(); | |
| 1381 _blocked_on_compilation = false; | |
| 1382 _jni_active_critical = 0; | |
| 1383 _do_not_unlock_if_synchronized = false; | |
| 1384 _cached_monitor_info = NULL; | |
| 1385 _parker = Parker::Allocate(this) ; | |
| 1386 | |
| 1387 #ifndef PRODUCT | |
| 1388 _jmp_ring_index = 0; | |
| 1389 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1390 record_jump(NULL, NULL, NULL, 0); | |
| 1391 } | |
| 1392 #endif /* PRODUCT */ | |
| 1393 | |
| 1394 set_thread_profiler(NULL); | |
| 1395 if (FlatProfiler::is_active()) { | |
| 1396 // This is where we would decide to either give each thread it's own profiler | |
| 1397 // or use one global one from FlatProfiler, | |
| 1398 // or up to some count of the number of profiled threads, etc. | |
| 1399 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1400 pp->engage(); | |
| 1401 set_thread_profiler(pp); | |
| 1402 } | |
| 1403 | |
| 1404 // Setup safepoint state info for this thread | |
| 1405 ThreadSafepointState::create(this); | |
| 1406 | |
| 1407 debug_only(_java_call_counter = 0); | |
| 1408 | |
| 1409 // JVMTI PopFrame support | |
| 1410 _popframe_condition = popframe_inactive; | |
| 1411 _popframe_preserved_args = NULL; | |
| 1412 _popframe_preserved_args_size = 0; | |
| 1413 | |
| 1414 pd_initialize(); | |
| 1415 } | |
| 1416 | |
|
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1417 #ifndef SERIALGC |
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1418 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1419 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1420 #endif // !SERIALGC |
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1421 |
| 4006 | 1422 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1423 Thread() |
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1424 #ifndef SERIALGC |
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1425 , _satb_mark_queue(&_satb_mark_queue_set), |
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1426 _dirty_card_queue(&_dirty_card_queue_set) |
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1427 #endif // !SERIALGC |
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1428 { |
| 0 | 1429 initialize(); |
| 4006 | 1430 if (is_attaching_via_jni) { |
| 1431 _jni_attach_state = _attaching_via_jni; | |
| 1432 } else { | |
| 1433 _jni_attach_state = _not_attaching_via_jni; | |
| 1434 } | |
|
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1435 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 6197 | 1436 _safepoint_visible = false; |
| 0 | 1437 } |
| 1438 | |
| 1439 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1440 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1441 return true; // Stack already guarded or guard pages not needed. | |
| 1442 } | |
| 1443 | |
| 1444 if (register_stack_overflow()) { | |
| 1445 // For those architectures which have separate register and | |
| 1446 // memory stacks, we must check the register stack to see if | |
| 1447 // it has overflowed. | |
| 1448 return false; | |
| 1449 } | |
| 1450 | |
| 1451 // Java code never executes within the yellow zone: the latter is only | |
| 1452 // there to provoke an exception during stack banging. If java code | |
| 1453 // is executing there, either StackShadowPages should be larger, or | |
| 1454 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1455 // when it should. | |
| 1456 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1457 | |
| 1458 enable_stack_yellow_zone(); | |
| 1459 return true; | |
| 1460 } | |
| 1461 | |
| 1462 bool JavaThread::reguard_stack(void) { | |
| 1463 return reguard_stack(os::current_stack_pointer()); | |
| 1464 } | |
| 1465 | |
| 1466 | |
| 1467 void JavaThread::block_if_vm_exited() { | |
| 1468 if (_terminated == _vm_exited) { | |
| 1469 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1470 // we will block here forever | |
| 1471 Threads_lock->lock_without_safepoint_check(); | |
| 1472 ShouldNotReachHere(); | |
| 1473 } | |
| 1474 } | |
| 1475 | |
| 1476 | |
| 1477 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1478 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1479 | |
|
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1480 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1481 Thread() |
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1482 #ifndef SERIALGC |
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1483 , _satb_mark_queue(&_satb_mark_queue_set), |
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1484 _dirty_card_queue(&_dirty_card_queue_set) |
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1485 #endif // !SERIALGC |
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1486 { |
| 0 | 1487 if (TraceThreadEvents) { |
| 1488 tty->print_cr("creating thread %p", this); | |
| 1489 } | |
| 1490 initialize(); | |
| 4006 | 1491 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1492 set_entry_point(entry_point); |
| 1493 // Create the native thread itself. | |
| 1494 // %note runtime_23 | |
| 1495 os::ThreadType thr_type = os::java_thread; | |
| 1496 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1497 os::java_thread; | |
| 1498 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1499 _safepoint_visible = false; |
| 0 | 1500 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1501 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1502 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1503 // the exception consists of creating the exception object & initializing it, initialization | |
| 1504 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1505 // | |
| 1506 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1507 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1508 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1509 // object must be fully initialized (take a look at JVM_Start) | |
| 1510 } | |
| 1511 | |
| 1512 JavaThread::~JavaThread() { | |
| 1513 if (TraceThreadEvents) { | |
| 1514 tty->print_cr("terminate thread %p", this); | |
| 1515 } | |
| 1516 | |
| 6197 | 1517 // Info NMT that this JavaThread is exiting, its memory |
| 1518 // recorder should be collected | |
| 1519 assert(!is_safepoint_visible(), "wrong state"); | |
| 1520 MemTracker::thread_exiting(this); | |
| 1521 | |
| 0 | 1522 // JSR166 -- return the parker to the free list |
| 1523 Parker::Release(_parker); | |
| 1524 _parker = NULL ; | |
| 1525 | |
| 1526 // Free any remaining previous UnrollBlock | |
| 1527 vframeArray* old_array = vframe_array_last(); | |
| 1528 | |
| 1529 if (old_array != NULL) { | |
| 1530 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1531 old_array->set_unroll_block(NULL); | |
| 1532 delete old_info; | |
| 1533 delete old_array; | |
| 1534 } | |
| 1535 | |
| 1536 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1537 if (deferred != NULL) { | |
| 1538 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1539 assert(deferred->length() != 0, "empty array!"); | |
| 1540 do { | |
| 1541 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1542 deferred->remove_at(0); | |
| 1543 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1544 delete dlv; | |
| 1545 } while (deferred->length() != 0); | |
| 1546 delete deferred; | |
| 1547 } | |
| 1548 | |
| 1549 // All Java related clean up happens in exit | |
| 1550 ThreadSafepointState::destroy(this); | |
| 1551 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1552 if (_thread_stat != NULL) delete _thread_stat; | |
| 1553 } | |
| 1554 | |
| 1555 | |
| 1556 // The first routine called by a new Java thread | |
| 1557 void JavaThread::run() { | |
| 1558 // initialize thread-local alloc buffer related fields | |
| 1559 this->initialize_tlab(); | |
| 1560 | |
| 1561 // used to test validitity of stack trace backs | |
| 1562 this->record_base_of_stack_pointer(); | |
| 1563 | |
| 1564 // Record real stack base and size. | |
| 1565 this->record_stack_base_and_size(); | |
| 1566 | |
| 1567 // Initialize thread local storage; set before calling MutexLocker | |
| 1568 this->initialize_thread_local_storage(); | |
| 1569 | |
| 1570 this->create_stack_guard_pages(); | |
| 1571 | |
|
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1572 this->cache_global_variables(); |
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1573 |
| 0 | 1574 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1575 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1576 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1577 | |
| 1578 assert(JavaThread::current() == this, "sanity check"); | |
| 1579 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1580 | |
| 1581 DTRACE_THREAD_PROBE(start, this); | |
| 1582 | |
| 1583 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1584 // been completed. | |
| 1585 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1586 | |
| 1587 if (JvmtiExport::should_post_thread_life()) { | |
| 1588 JvmtiExport::post_thread_start(this); | |
| 1589 } | |
| 1590 | |
|
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1591 EVENT_BEGIN(TraceEventThreadStart, event); |
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1592 EVENT_COMMIT(event, |
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1593 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1594 |
| 0 | 1595 // We call another function to do the rest so we are sure that the stack addresses used |
| 1596 // from there will be lower than the stack base just computed | |
| 1597 thread_main_inner(); | |
| 1598 | |
| 1599 // Note, thread is no longer valid at this point! | |
| 1600 } | |
| 1601 | |
| 1602 | |
| 1603 void JavaThread::thread_main_inner() { | |
| 1604 assert(JavaThread::current() == this, "sanity check"); | |
| 1605 assert(this->threadObj() != NULL, "just checking"); | |
| 1606 | |
|
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1607 // Execute thread entry point unless this thread has a pending exception |
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1608 // or has been stopped before starting. |
| 0 | 1609 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1610 if (!this->has_pending_exception() && |
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1611 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1612 { |
| 1613 ResourceMark rm(this); | |
| 1614 this->set_native_thread_name(this->get_thread_name()); | |
| 1615 } | |
| 0 | 1616 HandleMark hm(this); |
| 1617 this->entry_point()(this, this); | |
| 1618 } | |
| 1619 | |
| 1620 DTRACE_THREAD_PROBE(stop, this); | |
| 1621 | |
| 1622 this->exit(false); | |
| 1623 delete this; | |
| 1624 } | |
| 1625 | |
| 1626 | |
| 1627 static void ensure_join(JavaThread* thread) { | |
| 1628 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1629 Handle threadObj(thread, thread->threadObj()); | |
| 1630 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1631 ObjectLocker lock(threadObj, thread); | |
| 1632 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1633 thread->clear_pending_exception(); | |
| 1634 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1635 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1636 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1637 // to complete once we've done the notify_all below |
| 0 | 1638 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1639 lock.notify_all(thread); | |
| 1640 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1641 thread->clear_pending_exception(); | |
| 1642 } | |
| 1643 | |
|
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1644 |
| 0 | 1645 // For any new cleanup additions, please check to see if they need to be applied to |
| 1646 // cleanup_failed_attach_current_thread as well. | |
| 1647 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1648 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1649 if (!InitializeJavaLangSystem) return; | |
| 1650 | |
| 1651 HandleMark hm(this); | |
| 1652 Handle uncaught_exception(this, this->pending_exception()); | |
| 1653 this->clear_pending_exception(); | |
| 1654 Handle threadObj(this, this->threadObj()); | |
| 1655 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1656 | |
| 1657 if (get_thread_profiler() != NULL) { | |
| 1658 get_thread_profiler()->disengage(); | |
| 1659 ResourceMark rm; | |
| 1660 get_thread_profiler()->print(get_thread_name()); | |
| 1661 } | |
| 1662 | |
| 1663 | |
| 1664 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1665 { | |
| 1666 EXCEPTION_MARK; | |
| 1667 | |
| 1668 CLEAR_PENDING_EXCEPTION; | |
| 1669 } | |
| 1670 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1671 // has to be fixed by a runtime query method | |
| 1672 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1673 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1674 // java.lang.Thread.dispatchUncaughtException | |
| 1675 if (uncaught_exception.not_null()) { | |
| 1676 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1677 { | |
| 1678 EXCEPTION_MARK; | |
| 1679 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1680 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1681 // so call ThreadGroup.uncaughtException() | |
| 1682 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1683 CallInfo callinfo; | |
| 1142 | 1684 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1685 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1686 vmSymbols::dispatchUncaughtException_name(), |
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1687 vmSymbols::throwable_void_signature(), |
| 0 | 1688 KlassHandle(), false, false, THREAD); |
| 1689 CLEAR_PENDING_EXCEPTION; | |
| 1690 methodHandle method = callinfo.selected_method(); | |
| 1691 if (method.not_null()) { | |
| 1692 JavaValue result(T_VOID); | |
| 1693 JavaCalls::call_virtual(&result, | |
| 1694 threadObj, thread_klass, | |
|
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1695 vmSymbols::dispatchUncaughtException_name(), |
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1696 vmSymbols::throwable_void_signature(), |
| 0 | 1697 uncaught_exception, |
| 1698 THREAD); | |
| 1699 } else { | |
| 1142 | 1700 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1701 JavaValue result(T_VOID); |
| 1702 JavaCalls::call_virtual(&result, | |
| 1703 group, thread_group, | |
|
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1704 vmSymbols::uncaughtException_name(), |
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1705 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1706 threadObj, // Arg 1 |
| 1707 uncaught_exception, // Arg 2 | |
| 1708 THREAD); | |
| 1709 } | |
|
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1710 if (HAS_PENDING_EXCEPTION) { |
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1711 ResourceMark rm(this); |
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1712 jio_fprintf(defaultStream::error_stream(), |
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1713 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1714 " in thread \"%s\"\n", |
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1715 Klass::cast(pending_exception()->klass())->external_name(), |
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1716 get_thread_name()); |
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1717 CLEAR_PENDING_EXCEPTION; |
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1718 } |
| 0 | 1719 } |
| 1720 } | |
| 1721 | |
|
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1722 // Called before the java thread exit since we want to read info |
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1723 // from java_lang_Thread object |
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1724 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1725 EVENT_COMMIT(event, |
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1726 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1727 |
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1728 // Call after last event on thread |
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1729 EVENT_THREAD_EXIT(this); |
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1730 |
| 0 | 1731 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1732 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1733 // is deprecated anyhow. | |
| 1734 { int count = 3; | |
| 1735 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1736 EXCEPTION_MARK; | |
| 1737 JavaValue result(T_VOID); | |
| 1142 | 1738 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1739 JavaCalls::call_virtual(&result, |
| 1740 threadObj, thread_klass, | |
|
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1741 vmSymbols::exit_method_name(), |
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1742 vmSymbols::void_method_signature(), |
| 0 | 1743 THREAD); |
| 1744 CLEAR_PENDING_EXCEPTION; | |
| 1745 } | |
| 1746 } | |
| 1747 | |
| 1748 // notify JVMTI | |
| 1749 if (JvmtiExport::should_post_thread_life()) { | |
| 1750 JvmtiExport::post_thread_end(this); | |
| 1751 } | |
| 1752 | |
| 1753 // We have notified the agents that we are exiting, before we go on, | |
| 1754 // we must check for a pending external suspend request and honor it | |
| 1755 // in order to not surprise the thread that made the suspend request. | |
| 1756 while (true) { | |
| 1757 { | |
| 1758 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1759 if (!is_external_suspend()) { | |
| 1760 set_terminated(_thread_exiting); | |
| 1761 ThreadService::current_thread_exiting(this); | |
| 1762 break; | |
| 1763 } | |
| 1764 // Implied else: | |
| 1765 // Things get a little tricky here. We have a pending external | |
| 1766 // suspend request, but we are holding the SR_lock so we | |
| 1767 // can't just self-suspend. So we temporarily drop the lock | |
| 1768 // and then self-suspend. | |
| 1769 } | |
| 1770 | |
| 1771 ThreadBlockInVM tbivm(this); | |
| 1772 java_suspend_self(); | |
| 1773 | |
| 1774 // We're done with this suspend request, but we have to loop around | |
| 1775 // and check again. Eventually we will get SR_lock without a pending | |
| 1776 // external suspend request and will be able to mark ourselves as | |
| 1777 // exiting. | |
| 1778 } | |
| 1779 // no more external suspends are allowed at this point | |
| 1780 } else { | |
| 1781 // before_exit() has already posted JVMTI THREAD_END events | |
| 1782 } | |
| 1783 | |
| 1784 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1785 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1786 // group should have the destroyed bit set before waiters are notified). | |
| 1787 ensure_join(this); | |
| 1788 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1789 | |
| 1790 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1791 // held by this thread must be released. A detach operation must only | |
| 1792 // get here if there are no Java frames on the stack. Therefore, any | |
| 1793 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1794 // pre-inflated and in the monitor cache. | |
| 1795 // | |
| 1796 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1797 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1798 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1799 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1800 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1801 } | |
| 1802 | |
| 1803 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1804 // is in a consistent state, in case GC happens | |
| 1805 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1806 | |
| 1807 if (active_handles() != NULL) { | |
| 1808 JNIHandleBlock* block = active_handles(); | |
| 1809 set_active_handles(NULL); | |
| 1810 JNIHandleBlock::release_block(block); | |
| 1811 } | |
| 1812 | |
| 1813 if (free_handle_block() != NULL) { | |
| 1814 JNIHandleBlock* block = free_handle_block(); | |
| 1815 set_free_handle_block(NULL); | |
| 1816 JNIHandleBlock::release_block(block); | |
| 1817 } | |
| 1818 | |
| 1819 // These have to be removed while this is still a valid thread. | |
| 1820 remove_stack_guard_pages(); | |
| 1821 | |
| 1822 if (UseTLAB) { | |
| 1823 tlab().make_parsable(true); // retire TLAB | |
| 1824 } | |
| 1825 | |
|
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1826 if (JvmtiEnv::environments_might_exist()) { |
|
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1827 JvmtiExport::cleanup_thread(this); |
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1828 } |
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1829 |
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1830 #ifndef SERIALGC |
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1831 // We must flush G1-related buffers before removing a thread from |
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1832 // the list of active threads. |
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1833 if (UseG1GC) { |
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1834 flush_barrier_queues(); |
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1835 } |
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1836 #endif |
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1837 |
| 0 | 1838 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1839 Threads::remove(this); | |
| 1840 } | |
| 1841 | |
|
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1842 #ifndef SERIALGC |
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1843 // Flush G1-related queues. |
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1844 void JavaThread::flush_barrier_queues() { |
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1845 satb_mark_queue().flush(); |
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1846 dirty_card_queue().flush(); |
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1847 } |
|
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1848 |
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1849 void JavaThread::initialize_queues() { |
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1850 assert(!SafepointSynchronize::is_at_safepoint(), |
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1851 "we should not be at a safepoint"); |
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1852 |
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1853 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1854 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1855 // The SATB queue should have been constructed with its active |
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1856 // field set to false. |
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1857 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1858 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1859 // If we are creating the thread during a marking cycle, we should |
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1860 // set the active field of the SATB queue to true. |
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1861 if (satb_queue_set.is_active()) { |
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1862 satb_queue.set_active(true); |
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1863 } |
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1864 |
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1865 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1866 // The dirty card queue should have been constructed with its |
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1867 // active field set to true. |
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1868 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1869 } |
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1870 #endif // !SERIALGC |
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1871 |
| 0 | 1872 void JavaThread::cleanup_failed_attach_current_thread() { |
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1873 if (get_thread_profiler() != NULL) { |
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1874 get_thread_profiler()->disengage(); |
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1875 ResourceMark rm; |
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1876 get_thread_profiler()->print(get_thread_name()); |
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1877 } |
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1878 |
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1879 if (active_handles() != NULL) { |
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1880 JNIHandleBlock* block = active_handles(); |
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1881 set_active_handles(NULL); |
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1882 JNIHandleBlock::release_block(block); |
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1883 } |
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1884 |
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1885 if (free_handle_block() != NULL) { |
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1886 JNIHandleBlock* block = free_handle_block(); |
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1887 set_free_handle_block(NULL); |
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1888 JNIHandleBlock::release_block(block); |
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1889 } |
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1890 |
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1891 // These have to be removed while this is still a valid thread. |
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1892 remove_stack_guard_pages(); |
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1893 |
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1894 if (UseTLAB) { |
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1895 tlab().make_parsable(true); // retire TLAB, if any |
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1896 } |
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1897 |
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1898 #ifndef SERIALGC |
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1899 if (UseG1GC) { |
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1900 flush_barrier_queues(); |
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1901 } |
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1902 #endif |
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1903 |
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1904 Threads::remove(this); |
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1905 delete this; |
| 0 | 1906 } |
| 1907 | |
| 1908 | |
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1909 |
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1910 |
| 0 | 1911 JavaThread* JavaThread::active() { |
| 1912 Thread* thread = ThreadLocalStorage::thread(); | |
| 1913 assert(thread != NULL, "just checking"); | |
| 1914 if (thread->is_Java_thread()) { | |
| 1915 return (JavaThread*) thread; | |
| 1916 } else { | |
| 1917 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1918 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1919 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1920 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1921 return ret; | |
| 1922 } | |
| 1923 } | |
| 1924 | |
| 1925 bool JavaThread::is_lock_owned(address adr) const { | |
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1926 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1927 |
| 1928 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1929 if (chunk->contains(adr)) return true; | |
| 1930 } | |
| 1931 | |
| 1932 return false; | |
| 1933 } | |
| 1934 | |
| 1935 | |
| 1936 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1937 chunk->set_next(monitor_chunks()); | |
| 1938 set_monitor_chunks(chunk); | |
| 1939 } | |
| 1940 | |
| 1941 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1942 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1943 if (monitor_chunks() == chunk) { | |
| 1944 set_monitor_chunks(chunk->next()); | |
| 1945 } else { | |
| 1946 MonitorChunk* prev = monitor_chunks(); | |
| 1947 while (prev->next() != chunk) prev = prev->next(); | |
| 1948 prev->set_next(chunk->next()); | |
| 1949 } | |
| 1950 } | |
| 1951 | |
| 1952 // JVM support. | |
| 1953 | |
| 1954 // Note: this function shouldn't block if it's called in | |
| 1955 // _thread_in_native_trans state (such as from | |
| 1956 // check_special_condition_for_native_trans()). | |
| 1957 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1958 | |
| 1959 if (has_last_Java_frame() && has_async_condition()) { | |
| 1960 // If we are at a polling page safepoint (not a poll return) | |
| 1961 // then we must defer async exception because live registers | |
| 1962 // will be clobbered by the exception path. Poll return is | |
| 1963 // ok because the call we a returning from already collides | |
| 1964 // with exception handling registers and so there is no issue. | |
| 1965 // (The exception handling path kills call result registers but | |
| 1966 // this is ok since the exception kills the result anyway). | |
| 1967 | |
| 1968 if (is_at_poll_safepoint()) { | |
| 1969 // if the code we are returning to has deoptimized we must defer | |
| 1970 // the exception otherwise live registers get clobbered on the | |
| 1971 // exception path before deoptimization is able to retrieve them. | |
| 1972 // | |
| 1973 RegisterMap map(this, false); | |
| 1974 frame caller_fr = last_frame().sender(&map); | |
| 1975 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1976 if (caller_fr.is_deoptimized_frame()) { | |
| 1977 if (TraceExceptions) { | |
| 1978 ResourceMark rm; | |
| 1979 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1980 } | |
| 1981 return; | |
| 1982 } | |
| 1983 } | |
| 1984 } | |
| 1985 | |
| 1986 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1987 if (condition == _no_async_condition) { | |
| 1988 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1989 // was called: | |
| 1990 // - if we were here only because of an external suspend request, | |
| 1991 // then that was taken care of above (or cancelled) so we are done | |
| 1992 // - if we were here because of another async request, then it has | |
| 1993 // been cleared between the has_special_runtime_exit_condition() | |
| 1994 // and now so again we are done | |
| 1995 return; | |
| 1996 } | |
| 1997 | |
| 1998 // Check for pending async. exception | |
| 1999 if (_pending_async_exception != NULL) { | |
| 2000 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2001 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2002 |
| 2003 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2004 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2005 | |
| 2006 if (TraceExceptions) { | |
| 2007 ResourceMark rm; | |
| 2008 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2009 if (has_last_Java_frame() ) { | |
| 2010 frame f = last_frame(); | |
| 2011 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2012 } | |
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2013 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2014 } |
| 2015 _pending_async_exception = NULL; | |
| 2016 clear_has_async_exception(); | |
| 2017 } | |
| 2018 } | |
| 2019 | |
| 2020 if (check_unsafe_error && | |
| 2021 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2022 condition = _no_async_condition; // done | |
| 2023 switch (thread_state()) { | |
| 2024 case _thread_in_vm: | |
| 2025 { | |
| 2026 JavaThread* THREAD = this; | |
| 2027 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2028 } | |
| 2029 case _thread_in_native: | |
| 2030 { | |
| 2031 ThreadInVMfromNative tiv(this); | |
| 2032 JavaThread* THREAD = this; | |
| 2033 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2034 } | |
| 2035 case _thread_in_Java: | |
| 2036 { | |
| 2037 ThreadInVMfromJava tiv(this); | |
| 2038 JavaThread* THREAD = this; | |
| 2039 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2040 } | |
| 2041 default: | |
| 2042 ShouldNotReachHere(); | |
| 2043 } | |
| 2044 } | |
| 2045 | |
| 2046 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2047 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2048 "must have handled the async condition, if no exception"); | |
| 2049 } | |
| 2050 | |
| 2051 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2052 // | |
| 2053 // Check for pending external suspend. Internal suspend requests do | |
| 2054 // not use handle_special_runtime_exit_condition(). | |
| 2055 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2056 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2057 // threads could call into the VM with another thread's JNIEnv so we | |
| 2058 // can be here operating on behalf of a suspended thread (4432884). | |
| 2059 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2060 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2061 // | |
| 2062 // Because thread is external suspended the safepoint code will count | |
| 2063 // thread as at a safepoint. This can be odd because we can be here | |
| 2064 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2065 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2066 // before calling java_suspend_self like all other callers of it but | |
| 2067 // we must then observe proper safepoint protocol. (We can't leave | |
| 2068 // _thread_blocked with a safepoint in progress). However we can be | |
| 2069 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2070 // constructor/destructor pair because they assert on that type of | |
| 2071 // transition. We could do something like: | |
| 2072 // | |
| 2073 // JavaThreadState state = thread_state(); | |
| 2074 // set_thread_state(_thread_in_vm); | |
| 2075 // { | |
| 2076 // ThreadBlockInVM tbivm(this); | |
| 2077 // java_suspend_self() | |
| 2078 // } | |
| 2079 // set_thread_state(_thread_in_vm_trans); | |
| 2080 // if (safepoint) block; | |
| 2081 // set_thread_state(state); | |
| 2082 // | |
| 2083 // but that is pretty messy. Instead we just go with the way the | |
| 2084 // code has worked before and note that this is the only path to | |
| 2085 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2086 // mode. | |
| 2087 | |
| 2088 frame_anchor()->make_walkable(this); | |
| 2089 java_suspend_self(); | |
| 2090 | |
| 2091 // We might be here for reasons in addition to the self-suspend request | |
| 2092 // so check for other async requests. | |
| 2093 } | |
| 2094 | |
| 2095 if (check_asyncs) { | |
| 2096 check_and_handle_async_exceptions(); | |
| 2097 } | |
| 2098 } | |
| 2099 | |
| 2100 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2101 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2102 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2103 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2104 | |
| 2105 // Do not throw asynchronous exceptions against the compiler thread | |
| 2106 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2107 if (is_Compiler_thread()) return; | |
| 2108 | |
| 2109 { | |
| 2110 // Actually throw the Throwable against the target Thread - however | |
| 2111 // only if there is no thread death exception installed already. | |
| 1142 | 2112 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2113 // If the topmost frame is a runtime stub, then we are calling into |
| 2114 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2115 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2116 // may not be valid | |
| 2117 if (has_last_Java_frame()) { | |
| 2118 frame f = last_frame(); | |
| 2119 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2120 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2121 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2122 frame compiled_frame = f.sender(®_map); | |
| 2123 if (compiled_frame.can_be_deoptimized()) { | |
| 2124 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2125 } | |
| 2126 } | |
| 2127 } | |
| 2128 | |
| 2129 // Set async. pending exception in thread. | |
| 2130 set_pending_async_exception(java_throwable); | |
| 2131 | |
| 2132 if (TraceExceptions) { | |
| 2133 ResourceMark rm; | |
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2134 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2135 } |
| 2136 // for AbortVMOnException flag | |
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2137 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2138 } |
| 2139 } | |
| 2140 | |
| 2141 | |
| 2142 // Interrupt thread so it will wake up from a potential wait() | |
| 2143 Thread::interrupt(this); | |
| 2144 } | |
| 2145 | |
| 2146 // External suspension mechanism. | |
| 2147 // | |
| 2148 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2149 // to any VM_locks and it is at a transition | |
| 2150 // Self-suspension will happen on the transition out of the vm. | |
| 2151 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2152 // | |
| 2153 // Guarantees on return: | |
| 2154 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2155 // force a safepoint) | |
| 2156 // + Target thread will not enter any new monitors | |
| 2157 // | |
| 2158 void JavaThread::java_suspend() { | |
| 2159 { MutexLocker mu(Threads_lock); | |
| 2160 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2161 return; | |
| 2162 } | |
| 2163 } | |
| 2164 | |
| 2165 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2166 if (!is_external_suspend()) { | |
| 2167 // a racing resume has cancelled us; bail out now | |
| 2168 return; | |
| 2169 } | |
| 2170 | |
| 2171 // suspend is done | |
| 2172 uint32_t debug_bits = 0; | |
| 2173 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2174 // SR_lock to allow the thread to reach a stable thread state if | |
| 2175 // it is currently in a transient thread state. | |
| 2176 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2177 SuspendRetryDelay, &debug_bits) ) { | |
| 2178 return; | |
| 2179 } | |
| 2180 } | |
| 2181 | |
| 2182 VM_ForceSafepoint vm_suspend; | |
| 2183 VMThread::execute(&vm_suspend); | |
| 2184 } | |
| 2185 | |
| 2186 // Part II of external suspension. | |
| 2187 // A JavaThread self suspends when it detects a pending external suspend | |
| 2188 // request. This is usually on transitions. It is also done in places | |
| 2189 // where continuing to the next transition would surprise the caller, | |
| 2190 // e.g., monitor entry. | |
| 2191 // | |
| 2192 // Returns the number of times that the thread self-suspended. | |
| 2193 // | |
| 2194 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2195 // thread. java_suspend_self() is the second stage of cooperative | |
| 2196 // suspension for external suspend requests and should only be used | |
| 2197 // to complete an external suspend request. | |
| 2198 // | |
| 2199 int JavaThread::java_suspend_self() { | |
| 2200 int ret = 0; | |
| 2201 | |
| 2202 // we are in the process of exiting so don't suspend | |
| 2203 if (is_exiting()) { | |
| 2204 clear_external_suspend(); | |
| 2205 return ret; | |
| 2206 } | |
| 2207 | |
| 2208 assert(_anchor.walkable() || | |
| 2209 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2210 "must have walkable stack"); | |
| 2211 | |
| 2212 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2213 | |
| 979 | 2214 assert(!this->is_ext_suspended(), |
| 0 | 2215 "a thread trying to self-suspend should not already be suspended"); |
| 2216 | |
| 2217 if (this->is_suspend_equivalent()) { | |
| 2218 // If we are self-suspending as a result of the lifting of a | |
| 2219 // suspend equivalent condition, then the suspend_equivalent | |
| 2220 // flag is not cleared until we set the ext_suspended flag so | |
| 2221 // that wait_for_ext_suspend_completion() returns consistent | |
| 2222 // results. | |
| 2223 this->clear_suspend_equivalent(); | |
| 2224 } | |
| 2225 | |
| 2226 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2227 // above. Or another external suspend request could be waiting for us | |
| 2228 // by the time we return from SR_lock()->wait(). The thread | |
| 2229 // that requested the suspension may already be trying to walk our | |
| 2230 // stack and if we return now, we can change the stack out from under | |
| 2231 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2232 // to crash. We stay self-suspended until there are no more pending | |
| 2233 // external suspend requests. | |
| 2234 while (is_external_suspend()) { | |
| 2235 ret++; | |
| 2236 this->set_ext_suspended(); | |
| 2237 | |
| 2238 // _ext_suspended flag is cleared by java_resume() | |
| 2239 while (is_ext_suspended()) { | |
| 2240 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2241 } | |
| 2242 } | |
| 2243 | |
| 2244 return ret; | |
| 2245 } | |
| 2246 | |
| 2247 #ifdef ASSERT | |
| 2248 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2249 // hence doesn't need protection from concurrent access at this stage | |
| 2250 void JavaThread::verify_not_published() { | |
| 2251 if (!Threads_lock->owned_by_self()) { | |
| 2252 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2253 assert( !Threads::includes(this), | |
| 2254 "java thread shouldn't have been published yet!"); | |
| 2255 } | |
| 2256 else { | |
| 2257 assert( !Threads::includes(this), | |
| 2258 "java thread shouldn't have been published yet!"); | |
| 2259 } | |
| 2260 } | |
| 2261 #endif | |
| 2262 | |
| 2263 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2264 // progress or when _suspend_flags is non-zero. | |
| 2265 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2266 // block if a safepoint is in progress. | |
| 2267 // Async exception ISN'T checked. | |
| 2268 // Note only the ThreadInVMfromNative transition can call this function | |
| 2269 // directly and when thread state is _thread_in_native_trans | |
| 2270 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2271 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2272 | |
| 2273 JavaThread *curJT = JavaThread::current(); | |
| 2274 bool do_self_suspend = thread->is_external_suspend(); | |
| 2275 | |
| 2276 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2277 | |
| 2278 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2279 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2280 // threads could call into the VM with another thread's JNIEnv so we | |
| 2281 // can be here operating on behalf of a suspended thread (4432884). | |
| 2282 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2283 JavaThreadState state = thread->thread_state(); | |
| 2284 | |
| 2285 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2286 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2287 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2288 thread->set_suspend_equivalent(); | |
| 2289 | |
| 2290 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2291 // wait until the thread changes to other thread state. There is no | |
| 2292 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2293 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2294 // too long. Temporarily change the state to _thread_blocked to | |
| 2295 // let the VM thread know that this thread is ready for GC. The problem | |
| 2296 // of changing thread state is that safepoint could happen just after | |
| 2297 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2298 // see the _thread_blocked state. We must check for safepoint | |
| 2299 // after restoring the state and make sure we won't leave while a safepoint | |
| 2300 // is in progress. | |
| 2301 thread->set_thread_state(_thread_blocked); | |
| 2302 thread->java_suspend_self(); | |
| 2303 thread->set_thread_state(state); | |
| 2304 // Make sure new state is seen by VM thread | |
| 2305 if (os::is_MP()) { | |
| 2306 if (UseMembar) { | |
| 2307 // Force a fence between the write above and read below | |
| 2308 OrderAccess::fence(); | |
| 2309 } else { | |
| 2310 // Must use this rather than serialization page in particular on Windows | |
| 2311 InterfaceSupport::serialize_memory(thread); | |
| 2312 } | |
| 2313 } | |
| 2314 } | |
| 2315 | |
| 2316 if (SafepointSynchronize::do_call_back()) { | |
| 2317 // If we are safepointing, then block the caller which may not be | |
| 2318 // the same as the target thread (see above). | |
| 2319 SafepointSynchronize::block(curJT); | |
| 2320 } | |
| 2321 | |
| 2322 if (thread->is_deopt_suspend()) { | |
| 2323 thread->clear_deopt_suspend(); | |
| 2324 RegisterMap map(thread, false); | |
| 2325 frame f = thread->last_frame(); | |
| 2326 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2327 f = f.sender(&map); | |
| 2328 } | |
| 2329 if (f.id() == thread->must_deopt_id()) { | |
| 2330 thread->clear_must_deopt_id(); | |
|
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2331 f.deoptimize(thread); |
| 0 | 2332 } else { |
| 2333 fatal("missed deoptimization!"); | |
| 2334 } | |
| 2335 } | |
| 2336 } | |
| 2337 | |
| 2338 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2339 // progress or when _suspend_flags is non-zero. | |
| 2340 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2341 // block if a safepoint is in progress. | |
| 2342 // Also check for pending async exception (not including unsafe access error). | |
| 2343 // Note only the native==>VM/Java barriers can call this function and when | |
| 2344 // thread state is _thread_in_native_trans. | |
| 2345 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2346 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2347 | |
| 2348 if (thread->has_async_exception()) { | |
| 2349 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2350 // access error since that may block. | |
| 2351 thread->check_and_handle_async_exceptions(false); | |
| 2352 } | |
| 2353 } | |
| 2354 | |
|
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2355 // This is a variant of the normal |
|
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2356 // check_special_condition_for_native_trans with slightly different |
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2357 // semantics for use by critical native wrappers. It does all the |
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2358 // normal checks but also performs the transition back into |
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2359 // thread_in_Java state. This is required so that critical natives |
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2360 // can potentially block and perform a GC if they are the last thread |
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2361 // exiting the GC_locker. |
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2362 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2363 check_special_condition_for_native_trans(thread); |
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2364 |
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2365 // Finish the transition |
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2366 thread->set_thread_state(_thread_in_Java); |
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2367 |
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2368 if (thread->do_critical_native_unlock()) { |
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2369 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2370 GC_locker::unlock_critical(thread); |
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2371 thread->clear_critical_native_unlock(); |
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2372 } |
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2373 } |
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2374 |
| 0 | 2375 // We need to guarantee the Threads_lock here, since resumes are not |
| 2376 // allowed during safepoint synchronization | |
| 2377 // Can only resume from an external suspension | |
| 2378 void JavaThread::java_resume() { | |
| 2379 assert_locked_or_safepoint(Threads_lock); | |
| 2380 | |
| 2381 // Sanity check: thread is gone, has started exiting or the thread | |
| 2382 // was not externally suspended. | |
| 2383 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2384 return; | |
| 2385 } | |
| 2386 | |
| 2387 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2388 | |
| 2389 clear_external_suspend(); | |
| 2390 | |
| 2391 if (is_ext_suspended()) { | |
| 2392 clear_ext_suspended(); | |
| 2393 SR_lock()->notify_all(); | |
| 2394 } | |
| 2395 } | |
| 2396 | |
| 2397 void JavaThread::create_stack_guard_pages() { | |
| 2398 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2399 address low_addr = stack_base() - stack_size(); | |
| 2400 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2401 | |
| 2402 int allocate = os::allocate_stack_guard_pages(); | |
| 2403 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2404 | |
|
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2405 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2406 warning("Attempt to allocate stack guard pages failed."); |
| 2407 return; | |
| 2408 } | |
| 2409 | |
| 2410 if (os::guard_memory((char *) low_addr, len)) { | |
| 2411 _stack_guard_state = stack_guard_enabled; | |
| 2412 } else { | |
| 2413 warning("Attempt to protect stack guard pages failed."); | |
| 2414 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2415 warning("Attempt to deallocate stack guard pages failed."); | |
| 2416 } | |
| 2417 } | |
| 2418 } | |
| 2419 | |
| 2420 void JavaThread::remove_stack_guard_pages() { | |
| 2421 if (_stack_guard_state == stack_guard_unused) return; | |
| 2422 address low_addr = stack_base() - stack_size(); | |
| 2423 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2424 | |
| 2425 if (os::allocate_stack_guard_pages()) { | |
|
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2426 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2427 _stack_guard_state = stack_guard_unused; |
| 2428 } else { | |
| 2429 warning("Attempt to deallocate stack guard pages failed."); | |
| 2430 } | |
| 2431 } else { | |
| 2432 if (_stack_guard_state == stack_guard_unused) return; | |
| 2433 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2434 _stack_guard_state = stack_guard_unused; | |
| 2435 } else { | |
| 2436 warning("Attempt to unprotect stack guard pages failed."); | |
| 2437 } | |
| 2438 } | |
| 2439 } | |
| 2440 | |
| 2441 void JavaThread::enable_stack_yellow_zone() { | |
| 2442 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2443 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2444 | |
| 2445 // The base notation is from the stacks point of view, growing downward. | |
| 2446 // We need to adjust it to work correctly with guard_memory() | |
| 2447 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2448 | |
| 2449 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2450 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2451 | |
| 2452 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2453 _stack_guard_state = stack_guard_enabled; | |
| 2454 } else { | |
| 2455 warning("Attempt to guard stack yellow zone failed."); | |
| 2456 } | |
| 2457 enable_register_stack_guard(); | |
| 2458 } | |
| 2459 | |
| 2460 void JavaThread::disable_stack_yellow_zone() { | |
| 2461 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2462 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2463 | |
| 2464 // Simply return if called for a thread that does not use guard pages. | |
| 2465 if (_stack_guard_state == stack_guard_unused) return; | |
| 2466 | |
| 2467 // The base notation is from the stacks point of view, growing downward. | |
| 2468 // We need to adjust it to work correctly with guard_memory() | |
| 2469 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2470 | |
| 2471 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2472 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2473 } else { | |
| 2474 warning("Attempt to unguard stack yellow zone failed."); | |
| 2475 } | |
| 2476 disable_register_stack_guard(); | |
| 2477 } | |
| 2478 | |
| 2479 void JavaThread::enable_stack_red_zone() { | |
| 2480 // The base notation is from the stacks point of view, growing downward. | |
| 2481 // We need to adjust it to work correctly with guard_memory() | |
| 2482 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2483 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2484 | |
| 2485 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2486 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2487 | |
| 2488 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2489 warning("Attempt to guard stack red zone failed."); | |
| 2490 } | |
| 2491 } | |
| 2492 | |
| 2493 void JavaThread::disable_stack_red_zone() { | |
| 2494 // The base notation is from the stacks point of view, growing downward. | |
| 2495 // We need to adjust it to work correctly with guard_memory() | |
| 2496 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2497 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2498 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2499 warning("Attempt to unguard stack red zone failed."); | |
| 2500 } | |
| 2501 } | |
| 2502 | |
| 2503 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2504 // ignore is there is no stack | |
| 2505 if (!has_last_Java_frame()) return; | |
| 2506 // traverse the stack frames. Starts from top frame. | |
| 2507 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2508 frame* fr = fst.current(); | |
| 2509 f(fr, fst.register_map()); | |
| 2510 } | |
| 2511 } | |
| 2512 | |
| 2513 | |
| 2514 #ifndef PRODUCT | |
| 2515 // Deoptimization | |
| 2516 // Function for testing deoptimization | |
| 2517 void JavaThread::deoptimize() { | |
| 2518 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2519 StackFrameStream fst(this, UseBiasedLocking); | |
| 2520 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2521 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2522 // Iterate over all frames in the thread and deoptimize | |
| 2523 for(; !fst.is_done(); fst.next()) { | |
| 2524 if(fst.current()->can_be_deoptimized()) { | |
| 2525 | |
| 2526 if (only_at) { | |
| 2527 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2528 // consists of comma or carriage return separated numbers so | |
| 2529 // search for the current bci in that string. | |
| 2530 address pc = fst.current()->pc(); | |
| 2531 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2532 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2533 char buffer[8]; | |
| 2534 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2535 size_t len = strlen(buffer); | |
| 2536 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2537 while (found != NULL) { | |
| 2538 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2539 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2540 // Check that the bci found is bracketed by terminators. | |
| 2541 break; | |
| 2542 } | |
| 2543 found = strstr(found + 1, buffer); | |
| 2544 } | |
| 2545 if (!found) { | |
| 2546 continue; | |
| 2547 } | |
| 2548 } | |
| 2549 | |
| 2550 if (DebugDeoptimization && !deopt) { | |
| 2551 deopt = true; // One-time only print before deopt | |
| 2552 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2553 trace_frames(); | |
| 2554 trace_stack(); | |
| 2555 } | |
| 2556 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2557 } | |
| 2558 } | |
| 2559 | |
| 2560 if (DebugDeoptimization && deopt) { | |
| 2561 tty->print_cr("[AFTER Deoptimization]"); | |
| 2562 trace_frames(); | |
| 2563 } | |
| 2564 } | |
| 2565 | |
| 2566 | |
| 2567 // Make zombies | |
| 2568 void JavaThread::make_zombies() { | |
| 2569 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2570 if (fst.current()->can_be_deoptimized()) { | |
| 2571 // it is a Java nmethod | |
| 2572 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2573 nm->make_not_entrant(); | |
| 2574 } | |
| 2575 } | |
| 2576 } | |
| 2577 #endif // PRODUCT | |
| 2578 | |
| 2579 | |
| 2580 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2581 if (!has_last_Java_frame()) return; | |
| 2582 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2583 StackFrameStream fst(this, UseBiasedLocking); | |
| 2584 for(; !fst.is_done(); fst.next()) { | |
| 2585 if (fst.current()->should_be_deoptimized()) { | |
| 2586 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2587 } | |
| 2588 } | |
| 2589 } | |
| 2590 | |
| 2591 | |
| 2592 // GC support | |
| 2593 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2594 | |
| 2595 void JavaThread::gc_epilogue() { | |
| 2596 frames_do(frame_gc_epilogue); | |
| 2597 } | |
| 2598 | |
| 2599 | |
| 2600 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2601 | |
| 2602 void JavaThread::gc_prologue() { | |
| 2603 frames_do(frame_gc_prologue); | |
| 2604 } | |
| 2605 | |
|
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2606 // If the caller is a NamedThread, then remember, in the current scope, |
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2607 // the given JavaThread in its _processed_thread field. |
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2608 class RememberProcessedThread: public StackObj { |
|
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2609 NamedThread* _cur_thr; |
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2610 public: |
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2611 RememberProcessedThread(JavaThread* jthr) { |
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2612 Thread* thread = Thread::current(); |
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2613 if (thread->is_Named_thread()) { |
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2614 _cur_thr = (NamedThread *)thread; |
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2615 _cur_thr->set_processed_thread(jthr); |
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2616 } else { |
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2617 _cur_thr = NULL; |
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2618 } |
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2619 } |
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2620 |
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2621 ~RememberProcessedThread() { |
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2622 if (_cur_thr) { |
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2623 _cur_thr->set_processed_thread(NULL); |
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2624 } |
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2625 } |
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2626 }; |
| 0 | 2627 |
|
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2628 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2629 // Verify that the deferred card marks have been flushed. |
| 2630 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2631 |
| 0 | 2632 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2633 // since there may be more than one thread using each ThreadProfiler. | |
| 2634 | |
| 2635 // Traverse the GCHandles | |
|
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2636 Thread::oops_do(f, cf); |
| 0 | 2637 |
| 2638 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2639 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2640 | |
| 2641 if (has_last_Java_frame()) { | |
|
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2642 // Record JavaThread to GC thread |
|
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2643 RememberProcessedThread rpt(this); |
| 0 | 2644 |
| 2645 // Traverse the privileged stack | |
| 2646 if (_privileged_stack_top != NULL) { | |
| 2647 _privileged_stack_top->oops_do(f); | |
| 2648 } | |
| 2649 | |
| 2650 // traverse the registered growable array | |
| 2651 if (_array_for_gc != NULL) { | |
| 2652 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2653 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2654 } | |
| 2655 } | |
| 2656 | |
| 2657 // Traverse the monitor chunks | |
| 2658 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2659 chunk->oops_do(f); | |
| 2660 } | |
| 2661 | |
| 2662 // Traverse the execution stack | |
| 2663 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2664 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2665 } |
| 2666 } | |
| 2667 | |
| 2668 // callee_target is never live across a gc point so NULL it here should | |
| 2669 // it still contain a methdOop. | |
| 2670 | |
| 2671 set_callee_target(NULL); | |
| 2672 | |
| 2673 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2674 // If we have deferred set_locals there might be oops waiting to be | |
| 2675 // written | |
| 2676 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2677 if (list != NULL) { | |
| 2678 for (int i = 0; i < list->length(); i++) { | |
| 2679 list->at(i)->oops_do(f); | |
| 2680 } | |
| 2681 } | |
| 2682 | |
| 2683 // Traverse instance variables at the end since the GC may be moving things | |
| 2684 // around using this function | |
| 2685 f->do_oop((oop*) &_threadObj); | |
| 2686 f->do_oop((oop*) &_vm_result); | |
| 2687 f->do_oop((oop*) &_exception_oop); | |
| 2688 f->do_oop((oop*) &_pending_async_exception); | |
| 2689 | |
| 2690 if (jvmti_thread_state() != NULL) { | |
| 2691 jvmti_thread_state()->oops_do(f); | |
| 2692 } | |
| 2693 } | |
| 2694 | |
|
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2695 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2696 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2697 |
| 2698 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2699 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2700 | |
| 2701 if (has_last_Java_frame()) { | |
| 2702 // Traverse the execution stack | |
| 2703 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2704 fst.current()->nmethods_do(cf); |
| 0 | 2705 } |
| 2706 } | |
| 2707 } | |
| 2708 | |
|
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2709 void JavaThread::metadata_do(void f(Metadata*)) { |
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2710 Thread::metadata_do(f); |
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2711 if (has_last_Java_frame()) { |
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2712 // Traverse the execution stack to call f() on the methods in the stack |
|
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2713 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2714 fst.current()->metadata_do(f); |
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2715 } |
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2716 } else if (is_Compiler_thread()) { |
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2717 // need to walk ciMetadata in current compile tasks to keep alive. |
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2718 CompilerThread* ct = (CompilerThread*)this; |
|
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2719 if (ct->env() != NULL) { |
|
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2720 ct->env()->metadata_do(f); |
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2721 } |
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2722 } |
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2723 } |
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2724 |
| 0 | 2725 // Printing |
| 2726 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2727 switch (_thread_state) { | |
| 2728 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2729 case _thread_new: return "_thread_new"; | |
| 2730 case _thread_new_trans: return "_thread_new_trans"; | |
| 2731 case _thread_in_native: return "_thread_in_native"; | |
| 2732 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2733 case _thread_in_vm: return "_thread_in_vm"; | |
| 2734 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2735 case _thread_in_Java: return "_thread_in_Java"; | |
| 2736 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2737 case _thread_blocked: return "_thread_blocked"; | |
| 2738 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2739 default: return "unknown thread state"; | |
| 2740 } | |
| 2741 } | |
| 2742 | |
| 2743 #ifndef PRODUCT | |
| 2744 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2745 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2746 }; | |
| 2747 void JavaThread::print_thread_state() const { | |
| 2748 print_thread_state_on(tty); | |
| 2749 }; | |
| 2750 #endif // PRODUCT | |
| 2751 | |
| 2752 // Called by Threads::print() for VM_PrintThreads operation | |
| 2753 void JavaThread::print_on(outputStream *st) const { | |
| 2754 st->print("\"%s\" ", get_thread_name()); | |
| 2755 oop thread_oop = threadObj(); | |
| 6766 | 2756 if (thread_oop != NULL) { |
| 2757 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2758 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2759 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2760 } | |
| 0 | 2761 Thread::print_on(st); |
| 2762 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2763 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2764 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2765 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2766 } | |
| 2767 #ifndef PRODUCT | |
| 2768 print_thread_state_on(st); | |
| 2769 _safepoint_state->print_on(st); | |
| 2770 #endif // PRODUCT | |
| 2771 } | |
| 2772 | |
| 2773 // Called by fatal error handler. The difference between this and | |
| 2774 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2775 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2776 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2777 oop thread_obj = threadObj(); | |
| 2778 if (thread_obj != NULL) { | |
| 2779 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2780 } | |
| 2781 st->print(" ["); | |
| 2782 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2783 if (osthread()) { | |
| 2784 st->print(", id=%d", osthread()->thread_id()); | |
| 2785 } | |
| 2786 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2787 _stack_base - _stack_size, _stack_base); | |
| 2788 st->print("]"); | |
| 2789 return; | |
| 2790 } | |
| 2791 | |
| 2792 // Verification | |
| 2793 | |
| 2794 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2795 | |
| 2796 void JavaThread::verify() { | |
| 2797 // Verify oops in the thread. | |
|
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2798 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2799 |
| 2800 // Verify the stack frames. | |
| 2801 frames_do(frame_verify); | |
| 2802 } | |
| 2803 | |
| 2804 // CR 6300358 (sub-CR 2137150) | |
| 2805 // Most callers of this method assume that it can't return NULL but a | |
| 2806 // thread may not have a name whilst it is in the process of attaching to | |
| 2807 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2808 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2809 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2810 // for such that this method never returns NULL. | |
| 2811 const char* JavaThread::get_thread_name() const { | |
| 2812 #ifdef ASSERT | |
| 2813 // early safepoints can hit while current thread does not yet have TLS | |
| 2814 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2815 Thread *cur = Thread::current(); | |
| 2816 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2817 // Current JavaThreads are allowed to get their own name without | |
| 2818 // the Threads_lock. | |
| 2819 assert_locked_or_safepoint(Threads_lock); | |
| 2820 } | |
| 2821 } | |
| 2822 #endif // ASSERT | |
| 2823 return get_thread_name_string(); | |
| 2824 } | |
| 2825 | |
| 2826 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2827 // descriptive string if there is no set name | |
| 2828 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2829 const char* name_str; | |
| 2830 oop thread_obj = threadObj(); | |
| 2831 if (thread_obj != NULL) { | |
| 2832 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2833 if (name != NULL) { | |
| 2834 if (buf == NULL) { | |
| 2835 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2836 } | |
| 2837 else { | |
| 2838 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2839 } | |
| 2840 } | |
| 4006 | 2841 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2842 name_str = "<no-name - thread is attaching>"; |
| 2843 } | |
| 2844 else { | |
| 2845 name_str = Thread::name(); | |
| 2846 } | |
| 2847 } | |
| 2848 else { | |
| 2849 name_str = Thread::name(); | |
| 2850 } | |
| 2851 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2852 return name_str; | |
| 2853 } | |
| 2854 | |
| 2855 | |
| 2856 const char* JavaThread::get_threadgroup_name() const { | |
| 2857 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2858 oop thread_obj = threadObj(); | |
| 2859 if (thread_obj != NULL) { | |
| 2860 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2861 if (thread_group != NULL) { | |
| 2862 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2863 // ThreadGroup.name can be null | |
| 2864 if (name != NULL) { | |
| 2865 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2866 return str; | |
| 2867 } | |
| 2868 } | |
| 2869 } | |
| 2870 return NULL; | |
| 2871 } | |
| 2872 | |
| 2873 const char* JavaThread::get_parent_name() const { | |
| 2874 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2875 oop thread_obj = threadObj(); | |
| 2876 if (thread_obj != NULL) { | |
| 2877 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2878 if (thread_group != NULL) { | |
| 2879 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2880 if (parent != NULL) { | |
| 2881 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2882 // ThreadGroup.name can be null | |
| 2883 if (name != NULL) { | |
| 2884 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2885 return str; | |
| 2886 } | |
| 2887 } | |
| 2888 } | |
| 2889 } | |
| 2890 return NULL; | |
| 2891 } | |
| 2892 | |
| 2893 ThreadPriority JavaThread::java_priority() const { | |
| 2894 oop thr_oop = threadObj(); | |
| 2895 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2896 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2897 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2898 return priority; | |
| 2899 } | |
| 2900 | |
| 2901 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2902 | |
| 2903 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2904 // Link Java Thread object <-> C++ Thread | |
| 2905 | |
| 2906 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2907 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2908 // be used to pass the C++ thread object to other methods. | |
| 2909 | |
| 2910 // Set the Java level thread object (jthread) field of the | |
| 2911 // new thread (a JavaThread *) to C++ thread object using the | |
| 2912 // "thread_oop" handle. | |
| 2913 | |
| 2914 // Set the thread field (a JavaThread *) of the | |
| 2915 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2916 | |
| 2917 Handle thread_oop(Thread::current(), | |
| 2918 JNIHandles::resolve_non_null(jni_thread)); | |
|
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6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
2919 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 2920 "must be initialized"); |
| 2921 set_threadObj(thread_oop()); | |
| 2922 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2923 | |
| 2924 if (prio == NoPriority) { | |
| 2925 prio = java_lang_Thread::priority(thread_oop()); | |
| 2926 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2927 } | |
| 2928 | |
| 2929 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2930 Thread::set_priority(this, prio); | |
| 2931 | |
| 2932 // Add the new thread to the Threads list and set it in motion. | |
| 2933 // We must have threads lock in order to call Threads::add. | |
| 2934 // It is crucial that we do not block before the thread is | |
| 2935 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2936 // will not be visited by GC. | |
| 2937 Threads::add(this); | |
| 2938 } | |
| 2939 | |
| 2940 oop JavaThread::current_park_blocker() { | |
| 2941 // Support for JSR-166 locks | |
| 2942 oop thread_oop = threadObj(); | |
| 242 | 2943 if (thread_oop != NULL && |
| 2944 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2945 return java_lang_Thread::park_blocker(thread_oop); |
| 2946 } | |
| 2947 return NULL; | |
| 2948 } | |
| 2949 | |
| 2950 | |
| 2951 void JavaThread::print_stack_on(outputStream* st) { | |
| 2952 if (!has_last_Java_frame()) return; | |
| 2953 ResourceMark rm; | |
| 2954 HandleMark hm; | |
| 2955 | |
| 2956 RegisterMap reg_map(this); | |
| 2957 vframe* start_vf = last_java_vframe(®_map); | |
| 2958 int count = 0; | |
| 2959 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2960 if (f->is_java_frame()) { | |
| 2961 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2962 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2963 | |
| 2964 // Print out lock information | |
| 2965 if (JavaMonitorsInStackTrace) { | |
| 2966 jvf->print_lock_info_on(st, count); | |
| 2967 } | |
| 2968 } else { | |
| 2969 // Ignore non-Java frames | |
| 2970 } | |
| 2971 | |
| 2972 // Bail-out case for too deep stacks | |
| 2973 count++; | |
| 2974 if (MaxJavaStackTraceDepth == count) return; | |
| 2975 } | |
| 2976 } | |
| 2977 | |
| 2978 | |
| 2979 // JVMTI PopFrame support | |
| 2980 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2981 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2982 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 2983 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 2984 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
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diff
changeset
|
2985 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2986 } |
| 2987 } | |
| 2988 | |
| 2989 void* JavaThread::popframe_preserved_args() { | |
| 2990 return _popframe_preserved_args; | |
| 2991 } | |
| 2992 | |
| 2993 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2994 return in_ByteSize(_popframe_preserved_args_size); | |
| 2995 } | |
| 2996 | |
| 2997 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2998 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2999 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3000 return in_WordSize(sz / wordSize); | |
| 3001 } | |
| 3002 | |
| 3003 void JavaThread::popframe_free_preserved_args() { | |
| 3004 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3005 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3006 _popframe_preserved_args = NULL; |
| 3007 _popframe_preserved_args_size = 0; | |
| 3008 } | |
| 3009 | |
| 3010 #ifndef PRODUCT | |
| 3011 | |
| 3012 void JavaThread::trace_frames() { | |
| 3013 tty->print_cr("[Describe stack]"); | |
| 3014 int frame_no = 1; | |
| 3015 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3016 tty->print(" %d. ", frame_no++); | |
| 3017 fst.current()->print_value_on(tty,this); | |
| 3018 tty->cr(); | |
| 3019 } | |
| 3020 } | |
| 3021 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3022 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3023 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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changeset
|
3024 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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|
3025 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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changeset
|
3026 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3027 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3028 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3029 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3030 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3031 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3032 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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diff
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|
3033 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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|
3034 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3035 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
|
3036 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3037 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3038 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3039 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3040 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
|
3041 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3042 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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diff
changeset
|
3043 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3044 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3045 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3046 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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changeset
|
3047 f->print_value(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
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changeset
|
3048 f->oops_do(&print, NULL, (RegisterMap*)map); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
3049 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
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diff
changeset
|
3050 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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changeset
|
3051 // 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
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changeset
|
3052 // 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:
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diff
changeset
|
3053 // 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
|
3054 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3055 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3056 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3057 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3058 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3059 |
| 0 | 3060 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3061 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3062 // 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
|
3063 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
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changeset
|
3064 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3065 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3066 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3067 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3068 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:
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diff
changeset
|
3069 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3070 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3071 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3072 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3073 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3074 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3075 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3076 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3077 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3078 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3079 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
3080 |
| 0 | 3081 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3082 ResourceMark rm; | |
| 3083 int vframe_no = 1; | |
| 3084 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3085 if (f->is_java_frame()) { | |
| 3086 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3087 } else { | |
| 3088 f->print(); | |
| 3089 } | |
| 3090 if (vframe_no > StackPrintLimit) { | |
| 3091 tty->print_cr("...<more frames>..."); | |
| 3092 return; | |
| 3093 } | |
| 3094 } | |
| 3095 } | |
| 3096 | |
| 3097 | |
| 3098 void JavaThread::trace_stack() { | |
| 3099 if (!has_last_Java_frame()) return; | |
| 3100 ResourceMark rm; | |
| 3101 HandleMark hm; | |
| 3102 RegisterMap reg_map(this); | |
| 3103 trace_stack_from(last_java_vframe(®_map)); | |
| 3104 } | |
| 3105 | |
| 3106 | |
| 3107 #endif // PRODUCT | |
| 3108 | |
| 3109 | |
| 3110 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3111 assert(reg_map != NULL, "a map must be given"); | |
| 3112 frame f = last_frame(); | |
| 3113 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3114 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3115 } | |
| 3116 return NULL; | |
| 3117 } | |
| 3118 | |
| 3119 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
3120 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3121 vframeStream vfst(this); |
| 3122 vfst.security_get_caller_frame(depth); | |
| 3123 if (!vfst.at_end()) { | |
| 3124 return vfst.method()->method_holder(); | |
| 3125 } | |
| 3126 return NULL; | |
| 3127 } | |
| 3128 | |
| 3129 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3130 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3131 CompileBroker::compiler_thread_loop(); | |
| 3132 } | |
| 3133 | |
| 3134 // Create a CompilerThread | |
| 3135 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3136 : JavaThread(&compiler_thread_entry) { | |
| 3137 _env = NULL; | |
| 3138 _log = NULL; | |
| 3139 _task = NULL; | |
| 3140 _queue = queue; | |
| 3141 _counters = counters; | |
| 1584 | 3142 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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3336
diff
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|
3143 _scanned_nmethod = NULL; |
| 0 | 3144 |
| 3145 #ifndef PRODUCT | |
| 3146 _ideal_graph_printer = NULL; | |
| 3147 #endif | |
| 3148 } | |
| 3149 | |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
3150 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
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diff
changeset
|
3151 JavaThread::oops_do(f, cf); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
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diff
changeset
|
3152 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3153 // 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
|
3154 // 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
|
3155 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3156 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3157 } |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3158 } |
| 0 | 3159 |
| 3160 // ======= Threads ======== | |
| 3161 | |
| 3162 // The Threads class links together all active threads, and provides | |
| 3163 // operations over all threads. It is protected by its own Mutex | |
| 3164 // lock, which is also used in other contexts to protect thread | |
| 3165 // operations from having the thread being operated on from exiting | |
| 3166 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3167 | |
| 3168 JavaThread* Threads::_thread_list = NULL; | |
| 3169 int Threads::_number_of_threads = 0; | |
| 3170 int Threads::_number_of_non_daemon_threads = 0; | |
| 3171 int Threads::_return_code = 0; | |
| 3172 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
|
3173 #ifdef ASSERT |
|
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3174 bool Threads::_vm_complete = false; |
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3175 #endif |
| 0 | 3176 |
| 3177 // All JavaThreads | |
| 3178 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3179 | |
| 3180 void os_stream(); | |
| 3181 | |
| 3182 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3183 void Threads::threads_do(ThreadClosure* tc) { | |
| 3184 assert_locked_or_safepoint(Threads_lock); | |
| 3185 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3186 ALL_JAVA_THREADS(p) { | |
| 3187 tc->do_thread(p); | |
| 3188 } | |
| 3189 // Someday we could have a table or list of all non-JavaThreads. | |
| 3190 // For now, just manually iterate through them. | |
| 3191 tc->do_thread(VMThread::vm_thread()); | |
| 3192 Universe::heap()->gc_threads_do(tc); | |
|
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3193 WatcherThread *wt = WatcherThread::watcher_thread(); |
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3194 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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3195 // the data for WatcherThread is still valid upon being examined. However, |
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3196 // considering that WatchThread terminates when the VM is on the way to |
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3197 // exit at safepoint, the chance of the above is extremely small. The right |
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3198 // way to prevent termination of WatcherThread would be to acquire |
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3199 // Terminator_lock, but we can't do that without violating the lock rank |
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3200 // checking in some cases. |
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3201 if (wt != NULL) |
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3202 tc->do_thread(wt); |
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|
3203 |
| 0 | 3204 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3205 } | |
| 3206 | |
| 3207 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3208 | |
| 242 | 3209 extern void JDK_Version_init(); |
| 3210 | |
| 0 | 3211 // Check version |
| 3212 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3213 | |
| 3214 // Initialize the output stream module | |
| 3215 ostream_init(); | |
| 3216 | |
| 3217 // Process java launcher properties. | |
| 3218 Arguments::process_sun_java_launcher_properties(args); | |
| 3219 | |
| 3220 // Initialize the os module before using TLS | |
| 3221 os::init(); | |
| 3222 | |
| 3223 // Initialize system properties. | |
| 3224 Arguments::init_system_properties(); | |
| 3225 | |
| 242 | 3226 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3227 JDK_Version_init(); | |
| 3228 | |
|
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3229 // Update/Initialize System properties after JDK version number is known |
|
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|
3230 Arguments::init_version_specific_system_properties(); |
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3231 |
| 0 | 3232 // Parse arguments |
| 3233 jint parse_result = Arguments::parse(args); | |
| 3234 if (parse_result != JNI_OK) return parse_result; | |
| 3235 | |
| 3236 if (PauseAtStartup) { | |
| 3237 os::pause(); | |
| 3238 } | |
| 3239 | |
| 4006 | 3240 #ifndef USDT2 |
| 0 | 3241 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3242 #else /* USDT2 */ |
| 3243 HOTSPOT_VM_INIT_BEGIN(); | |
| 3244 #endif /* USDT2 */ | |
| 0 | 3245 |
| 3246 // Record VM creation timing statistics | |
| 3247 TraceVmCreationTime create_vm_timer; | |
| 3248 create_vm_timer.start(); | |
| 3249 | |
| 3250 // Timing (must come after argument parsing) | |
| 3251 TraceTime timer("Create VM", TraceStartupTime); | |
| 3252 | |
| 3253 // Initialize the os module after parsing the args | |
| 3254 jint os_init_2_result = os::init_2(); | |
| 3255 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3256 | |
| 6197 | 3257 // intialize TLS |
| 3258 ThreadLocalStorage::init(); | |
| 3259 | |
| 3260 // Bootstrap native memory tracking, so it can start recording memory | |
| 3261 // activities before worker thread is started. This is the first phase | |
| 3262 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3263 MemTracker::bootstrap_single_thread(); | |
| 3264 | |
| 0 | 3265 // Initialize output stream logging |
| 3266 ostream_init_log(); | |
| 3267 | |
| 3268 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3269 // Must be before create_vm_init_agents() | |
| 3270 if (Arguments::init_libraries_at_startup()) { | |
| 3271 convert_vm_init_libraries_to_agents(); | |
| 3272 } | |
| 3273 | |
| 3274 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3275 if (Arguments::init_agents_at_startup()) { | |
| 3276 create_vm_init_agents(); | |
| 3277 } | |
| 3278 | |
| 3279 // Initialize Threads state | |
| 3280 _thread_list = NULL; | |
| 3281 _number_of_threads = 0; | |
| 3282 _number_of_non_daemon_threads = 0; | |
| 3283 | |
| 3284 // Initialize global data structures and create system classes in heap | |
| 3285 vm_init_globals(); | |
| 3286 | |
| 3287 // Attach the main thread to this os thread | |
| 3288 JavaThread* main_thread = new JavaThread(); | |
| 3289 main_thread->set_thread_state(_thread_in_vm); | |
| 3290 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3291 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3292 // change the stack size recorded here to one based on the java thread | |
| 3293 // stacksize. This adjusted size is what is used to figure the placement | |
| 3294 // of the guard pages. | |
| 3295 main_thread->record_stack_base_and_size(); | |
| 3296 main_thread->initialize_thread_local_storage(); | |
| 3297 | |
| 3298 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3299 | |
| 3300 if (!main_thread->set_as_starting_thread()) { | |
| 3301 vm_shutdown_during_initialization( | |
| 3302 "Failed necessary internal allocation. Out of swap space"); | |
| 3303 delete main_thread; | |
| 3304 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3305 return JNI_ENOMEM; | |
| 3306 } | |
| 3307 | |
| 3308 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3309 // crash Linux VM, see notes in os_linux.cpp. | |
| 3310 main_thread->create_stack_guard_pages(); | |
| 3311 | |
| 1878 | 3312 // Initialize Java-Level synchronization subsystem |
| 3313 ObjectMonitor::Initialize() ; | |
| 0 | 3314 |
| 6197 | 3315 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3316 MemTracker::bootstrap_multi_thread(); | |
| 3317 | |
| 0 | 3318 // Initialize global modules |
| 3319 jint status = init_globals(); | |
| 3320 if (status != JNI_OK) { | |
| 3321 delete main_thread; | |
| 3322 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3323 return status; | |
| 3324 } | |
| 3325 | |
|
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3326 // Should be done after the heap is fully created |
|
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|
3327 main_thread->cache_global_variables(); |
|
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|
3328 |
| 0 | 3329 HandleMark hm; |
| 3330 | |
| 3331 { MutexLocker mu(Threads_lock); | |
| 3332 Threads::add(main_thread); | |
| 3333 } | |
| 3334 | |
| 3335 // Any JVMTI raw monitors entered in onload will transition into | |
| 3336 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3337 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3338 | |
| 3339 if (VerifyBeforeGC && | |
| 3340 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3341 Universe::heap()->prepare_for_verify(); | |
| 3342 Universe::verify(); // make sure we're starting with a clean slate | |
| 3343 } | |
| 3344 | |
| 6197 | 3345 // Fully start NMT |
| 3346 MemTracker::start(); | |
| 3347 | |
| 0 | 3348 // Create the VMThread |
| 3349 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3350 VMThread::create(); | |
| 3351 Thread* vmthread = VMThread::vm_thread(); | |
| 3352 | |
| 3353 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3354 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3355 | |
| 3356 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3357 // Monitors can have spurious returns, must always check another state flag | |
| 3358 { | |
| 3359 MutexLocker ml(Notify_lock); | |
| 3360 os::start_thread(vmthread); | |
| 3361 while (vmthread->active_handles() == NULL) { | |
| 3362 Notify_lock->wait(); | |
| 3363 } | |
| 3364 } | |
| 3365 } | |
| 3366 | |
| 3367 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3368 EXCEPTION_MARK; | |
| 3369 | |
| 3370 // At this point, the Universe is initialized, but we have not executed | |
| 3371 // any byte code. Now is a good time (the only time) to dump out the | |
| 3372 // internal state of the JVM for sharing. | |
| 3373 if (DumpSharedSpaces) { | |
|
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3374 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3375 ShouldNotReachHere(); |
| 3376 } | |
| 3377 | |
| 3378 // Always call even when there are not JVMTI environments yet, since environments | |
| 3379 // may be attached late and JVMTI must track phases of VM execution | |
| 3380 JvmtiExport::enter_start_phase(); | |
| 3381 | |
| 3382 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3383 JvmtiExport::post_vm_start(); | |
| 3384 | |
| 3385 { | |
| 3386 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3387 | |
| 3388 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3389 create_vm_init_libraries(); | |
| 3390 } | |
| 3391 | |
| 3392 if (InitializeJavaLangString) { | |
|
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3393 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3394 } else { |
| 3395 warning("java.lang.String not initialized"); | |
| 3396 } | |
| 3397 | |
|
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3398 if (AggressiveOpts) { |
|
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3399 { |
|
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|
3400 // Forcibly initialize java/util/HashMap and mutate the private |
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|
3401 // static final "frontCacheEnabled" field before we start creating instances |
|
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|
3402 #ifdef ASSERT |
|
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3403 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
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3404 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
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|
3405 #endif |
|
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3406 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
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3407 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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3408 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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3409 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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|
3410 ik->initialize(CHECK_0); |
|
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|
3411 fieldDescriptor fd; |
|
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|
3412 // Possible we might not find this field; if so, don't break |
|
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|
3413 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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3414 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
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|
3415 } |
|
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|
3416 } |
|
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|
3417 |
|
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|
3418 if (UseStringCache) { |
|
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3419 // Forcibly initialize java/lang/StringValue and mutate the private |
|
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3420 // static final "stringCacheEnabled" field before we start creating instances |
|
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3421 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
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|
3422 // Possible that StringValue isn't present: if so, silently don't break |
|
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|
3423 if (k_o != NULL) { |
|
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|
3424 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3425 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3426 ik->initialize(CHECK_0); |
|
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|
3427 fieldDescriptor fd; |
|
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|
3428 // Possible we might not find this field: if so, silently don't break |
|
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|
3429 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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|
3430 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
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3431 } |
|
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3432 } |
|
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|
3433 } |
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|
3434 } |
|
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|
3435 |
| 0 | 3436 // Initialize java_lang.System (needed before creating the thread) |
| 3437 if (InitializeJavaLangSystem) { | |
|
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3438 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
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|
3439 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3440 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3441 Universe::set_main_thread_group(thread_group()); | |
|
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|
3442 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3443 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3444 main_thread->set_threadObj(thread_object); | |
| 3445 // Set thread status to running since main thread has | |
| 3446 // been started and running. | |
| 3447 java_lang_Thread::set_thread_status(thread_object, | |
| 3448 java_lang_Thread::RUNNABLE); | |
| 3449 | |
| 3450 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
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3451 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
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|
3452 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3453 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
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|
3454 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3455 call_initializeSystemClass(CHECK_0); |
| 6181 | 3456 |
| 3457 // get the Java runtime name after java.lang.System is initialized | |
| 3458 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
| 0 | 3459 } else { |
| 3460 warning("java.lang.System not initialized"); | |
| 3461 } | |
| 3462 | |
| 3463 // an instance of OutOfMemory exception has been allocated earlier | |
| 3464 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3465 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3466 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3467 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3468 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3469 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3470 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3471 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3472 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
| 0 | 3473 } else { |
| 3474 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3475 warning("java.lang.NullPointerException has not been initialized"); | |
| 3476 warning("java.lang.ClassCastException has not been initialized"); | |
| 3477 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3478 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3479 warning("java.lang.StackOverflowError has not been initialized"); | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3480 warning("java.lang.IllegalArgumentException has not been initialized"); |
| 0 | 3481 } |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3482 } |
| 0 | 3483 |
| 3484 // See : bugid 4211085. | |
| 3485 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3486 // property"java.compiler" and read & write property "java.vm.info". | |
| 3487 // When a security manager is installed through the command line | |
| 3488 // option "-Djava.security.manager", the above properties are not | |
| 3489 // readable and the static initializer for java.lang.Compiler fails | |
| 3490 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3491 // user code which calls methods in java.lang.Compiler. | |
| 3492 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3493 // system domains are on the stack when the properties are read. | |
| 3494 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3495 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3496 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3497 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3498 // 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
|
3499 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3500 |
| 3501 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3502 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3503 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3504 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3505 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3506 reset_vm_info_property(CHECK_0); | |
| 3507 | |
| 3508 quicken_jni_functions(); | |
| 3509 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3510 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3511 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3512 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3513 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3514 |
| 0 | 3515 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3516 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3517 set_init_completed(); | |
| 3518 | |
| 4006 | 3519 #ifndef USDT2 |
| 0 | 3520 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3521 #else /* USDT2 */ |
| 3522 HOTSPOT_VM_INIT_END(); | |
| 3523 #endif /* USDT2 */ | |
| 0 | 3524 |
| 3525 // record VM initialization completion time | |
| 3526 Management::record_vm_init_completed(); | |
| 3527 | |
| 3528 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3529 // valid exceptions may be thrown in the process. | |
| 3530 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3531 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3532 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3533 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3534 if (HAS_PENDING_EXCEPTION) { | |
| 3535 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3536 } | |
| 3537 | |
| 3538 #ifndef SERIALGC | |
| 3539 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3540 // 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
|
3541 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3542 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3543 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3544 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3545 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3546 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3547 } |
| 0 | 3548 if (HAS_PENDING_EXCEPTION) { |
| 3549 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3550 } | |
| 3551 } | |
| 3552 #endif // SERIALGC | |
| 3553 | |
| 3554 // Always call even when there are not JVMTI environments yet, since environments | |
| 3555 // may be attached late and JVMTI must track phases of VM execution | |
| 3556 JvmtiExport::enter_live_phase(); | |
| 3557 | |
| 3558 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3559 os::signal_init(); | |
| 3560 | |
| 3561 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3562 if (!DisableAttachMechanism) { | |
| 3563 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3564 AttachListener::init(); | |
| 3565 } | |
| 3566 } | |
| 3567 | |
| 3568 // Launch -Xrun agents | |
| 3569 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3570 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3571 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3572 create_vm_init_libraries(); | |
| 3573 } | |
| 3574 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3575 // 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
|
3576 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3577 |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3578 if (!TRACE_START()) { |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3579 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3580 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3581 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3582 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3583 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3584 } |
| 0 | 3585 |
| 3586 // initialize compiler(s) | |
| 3587 CompileBroker::compilation_init(); | |
| 3588 | |
| 3589 Management::initialize(THREAD); | |
| 3590 if (HAS_PENDING_EXCEPTION) { | |
| 3591 // management agent fails to start possibly due to | |
| 3592 // configuration problem and is responsible for printing | |
| 3593 // stack trace if appropriate. Simply exit VM. | |
| 3594 vm_exit(1); | |
| 3595 } | |
| 3596 | |
| 3597 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3598 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3599 if (MemProfiling) MemProfiler::engage(); | |
| 3600 StatSampler::engage(); | |
| 3601 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3602 | |
| 3603 BiasedLocking::init(); | |
| 3604 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3605 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
|
3606 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3607 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3608 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3609 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3610 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3611 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3612 } |
| 0 | 3613 |
| 3614 // Start up the WatcherThread if there are any periodic tasks | |
| 3615 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3616 // aren't, late joiners might appear to start slowly (we might | |
| 3617 // take a while to process their first tick). | |
| 3618 if (PeriodicTask::num_tasks() > 0) { | |
| 3619 WatcherThread::start(); | |
| 3620 } | |
| 3621 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3622 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3623 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3624 |
| 0 | 3625 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3626 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3627 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3628 #endif |
| 0 | 3629 return JNI_OK; |
| 3630 } | |
| 3631 | |
| 3632 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3633 extern "C" { | |
| 3634 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3635 } | |
| 3636 // Find a command line agent library and return its entry point for | |
| 3637 // -agentlib: -agentpath: -Xrun | |
| 3638 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3639 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3640 OnLoadEntry_t on_load_entry = NULL; | |
| 3641 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3642 | |
| 3643 if (library == NULL) { | |
| 3644 char buffer[JVM_MAXPATHLEN]; | |
| 3645 char ebuf[1024]; | |
| 3646 const char *name = agent->name(); | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3647 const char *msg = "Could not find agent library "; |
| 0 | 3648 |
| 3649 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3650 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3651 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3652 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
|
3653 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3654 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
|
3655 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3656 // 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
|
3657 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3658 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3659 } |
| 3660 } else { | |
| 3661 // Try to load the agent from the standard dll directory | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3662 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3663 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3664 #ifdef KERNEL |
| 3665 // Download instrument dll | |
| 3666 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3667 char *props = Arguments::get_kernel_properties(); | |
| 3668 char *home = Arguments::get_java_home(); | |
| 3669 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3670 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3671 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
| 6197 | 3672 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
| 0 | 3673 jio_snprintf(cmd, length, fmt, home, props); |
| 3674 int status = os::fork_and_exec(cmd); | |
| 3675 FreeHeap(props); | |
| 3676 if (status == -1) { | |
| 3677 warning(cmd); | |
| 3678 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3679 strerror(errno)); | |
| 3680 } | |
| 6197 | 3681 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
| 0 | 3682 // when this comes back the instrument.dll should be where it belongs. |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3683 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3684 } |
| 3685 #endif // KERNEL | |
| 3686 if (library == NULL) { // Try the local directory | |
| 3687 char ns[1] = {0}; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3688 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3689 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3690 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3691 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
|
3692 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3693 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
|
3694 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3695 // 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
|
3696 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3697 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3698 } |
| 3699 } | |
| 3700 } | |
| 3701 agent->set_os_lib(library); | |
| 3702 } | |
| 3703 | |
| 3704 // Find the OnLoad function. | |
| 3705 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3706 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3707 if (on_load_entry != NULL) break; |
| 3708 } | |
| 3709 return on_load_entry; | |
| 3710 } | |
| 3711 | |
| 3712 // Find the JVM_OnLoad entry point | |
| 3713 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3714 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3715 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3716 } | |
| 3717 | |
| 3718 // Find the Agent_OnLoad entry point | |
| 3719 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3720 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3721 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3722 } | |
| 3723 | |
| 3724 // For backwards compatibility with -Xrun | |
| 3725 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3726 // treated like -agentpath: | |
| 3727 // Must be called before agent libraries are created | |
| 3728 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3729 AgentLibrary* agent; | |
| 3730 AgentLibrary* next; | |
| 3731 | |
| 3732 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3733 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3734 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3735 | |
| 3736 // If there is an JVM_OnLoad function it will get called later, | |
| 3737 // otherwise see if there is an Agent_OnLoad | |
| 3738 if (on_load_entry == NULL) { | |
| 3739 on_load_entry = lookup_agent_on_load(agent); | |
| 3740 if (on_load_entry != NULL) { | |
| 3741 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3742 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3743 Arguments::convert_library_to_agent(agent); | |
| 3744 } else { | |
| 3745 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3746 } | |
| 3747 } | |
| 3748 } | |
| 3749 } | |
| 3750 | |
| 3751 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3752 // Invokes Agent_OnLoad | |
| 3753 // Called very early -- before JavaThreads exist | |
| 3754 void Threads::create_vm_init_agents() { | |
| 3755 extern struct JavaVM_ main_vm; | |
| 3756 AgentLibrary* agent; | |
| 3757 | |
| 3758 JvmtiExport::enter_onload_phase(); | |
| 3759 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3760 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3761 | |
| 3762 if (on_load_entry != NULL) { | |
| 3763 // Invoke the Agent_OnLoad function | |
| 3764 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3765 if (err != JNI_OK) { | |
| 3766 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3767 } | |
| 3768 } else { | |
| 3769 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3770 } | |
| 3771 } | |
| 3772 JvmtiExport::enter_primordial_phase(); | |
| 3773 } | |
| 3774 | |
| 3775 extern "C" { | |
| 3776 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3777 } | |
| 3778 | |
| 3779 void Threads::shutdown_vm_agents() { | |
| 3780 // Send any Agent_OnUnload notifications | |
| 3781 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3782 extern struct JavaVM_ main_vm; | |
| 3783 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3784 | |
| 3785 // Find the Agent_OnUnload function. | |
| 3786 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3787 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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|
3788 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3789 |
| 3790 // Invoke the Agent_OnUnload function | |
| 3791 if (unload_entry != NULL) { | |
| 3792 JavaThread* thread = JavaThread::current(); | |
| 3793 ThreadToNativeFromVM ttn(thread); | |
| 3794 HandleMark hm(thread); | |
| 3795 (*unload_entry)(&main_vm); | |
| 3796 break; | |
| 3797 } | |
| 3798 } | |
| 3799 } | |
| 3800 } | |
| 3801 | |
| 3802 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3803 // Invokes JVM_OnLoad | |
| 3804 void Threads::create_vm_init_libraries() { | |
| 3805 extern struct JavaVM_ main_vm; | |
| 3806 AgentLibrary* agent; | |
| 3807 | |
| 3808 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3809 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3810 | |
| 3811 if (on_load_entry != NULL) { | |
| 3812 // Invoke the JVM_OnLoad function | |
| 3813 JavaThread* thread = JavaThread::current(); | |
| 3814 ThreadToNativeFromVM ttn(thread); | |
| 3815 HandleMark hm(thread); | |
| 3816 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3817 if (err != JNI_OK) { | |
| 3818 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3819 } | |
| 3820 } else { | |
| 3821 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3822 } | |
| 3823 } | |
| 3824 } | |
| 3825 | |
| 3826 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3827 void JavaThread::invoke_shutdown_hooks() { | |
| 3828 HandleMark hm(this); | |
| 3829 | |
| 3830 // We could get here with a pending exception, if so clear it now. | |
| 3831 if (this->has_pending_exception()) { | |
| 3832 this->clear_pending_exception(); | |
| 3833 } | |
| 3834 | |
| 3835 EXCEPTION_MARK; | |
|
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|
3836 Klass* k = |
|
2177
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|
3837 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3838 THREAD); |
| 3839 if (k != NULL) { | |
| 3840 // SystemDictionary::resolve_or_null will return null if there was | |
| 3841 // an exception. If we cannot load the Shutdown class, just don't | |
| 3842 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3843 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3844 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3845 // was called, the Shutdown class would have already been loaded | |
| 3846 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3847 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3848 JavaValue result(T_VOID); | |
| 3849 JavaCalls::call_static(&result, | |
| 3850 shutdown_klass, | |
|
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|
3851 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
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|
3852 vmSymbols::void_method_signature(), |
| 0 | 3853 THREAD); |
| 3854 } | |
| 3855 CLEAR_PENDING_EXCEPTION; | |
| 3856 } | |
| 3857 | |
| 3858 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3859 // the program falls off the end of main(). Another VM exit path is through | |
| 3860 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3861 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3862 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3863 // and VM_Exit op at VM level. | |
| 3864 // | |
| 3865 // Shutdown sequence: | |
| 6197 | 3866 // + Shutdown native memory tracking if it is on |
| 0 | 3867 // + Wait until we are the last non-daemon thread to execute |
| 3868 // <-- every thing is still working at this moment --> | |
| 3869 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3870 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3871 // + Call before_exit(), prepare for VM exit | |
| 3872 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3873 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3874 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3875 // post thread end and vm death events to JVMTI, | |
| 3876 // stop signal thread | |
| 3877 // + Call JavaThread::exit(), it will: | |
| 3878 // > release JNI handle blocks, remove stack guard pages | |
| 3879 // > remove this thread from Threads list | |
| 3880 // <-- no more Java code from this thread after this point --> | |
| 3881 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3882 // the compiler threads at safepoint | |
| 3883 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3884 // + Disable tracing at JNI/JVM barriers | |
| 3885 // + Set _vm_exited flag for threads that are still running native code | |
| 3886 // + Delete this thread | |
| 3887 // + Call exit_globals() | |
| 3888 // > deletes tty | |
| 3889 // > deletes PerfMemory resources | |
| 3890 // + Return to caller | |
| 3891 | |
| 3892 bool Threads::destroy_vm() { | |
| 3893 JavaThread* thread = JavaThread::current(); | |
| 3894 | |
|
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|
3895 #ifdef ASSERT |
|
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|
3896 _vm_complete = false; |
|
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|
3897 #endif |
| 0 | 3898 // Wait until we are the last non-daemon thread to execute |
| 3899 { MutexLocker nu(Threads_lock); | |
| 3900 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3901 // This wait should make safepoint checks, wait without a timeout, | |
| 3902 // and wait as a suspend-equivalent condition. | |
| 3903 // | |
| 3904 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3905 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3906 // is waiting for the external suspend request on this thread to | |
| 3907 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3908 // timeout, but that takes time. Making this wait a suspend- | |
| 3909 // equivalent condition solves that timeout problem. | |
| 3910 // | |
| 3911 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3912 Mutex::_as_suspend_equivalent_flag); | |
| 3913 } | |
| 3914 | |
| 6197 | 3915 // Shutdown NMT before exit. Otherwise, |
| 3916 // it will run into trouble when system destroys static variables. | |
| 3917 MemTracker::shutdown(MemTracker::NMT_normal); | |
| 3918 | |
| 0 | 3919 // Hang forever on exit if we are reporting an error. |
| 3920 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3921 os::infinite_sleep(); | |
| 3922 } | |
|
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diff
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|
3923 os::wait_for_keypress_at_exit(); |
| 0 | 3924 |
| 3925 if (JDK_Version::is_jdk12x_version()) { | |
| 3926 // We are the last thread running, so check if finalizers should be run. | |
| 3927 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3928 HandleMark rm(thread); | |
| 3929 Universe::run_finalizers_on_exit(); | |
| 3930 } else { | |
| 3931 // run Java level shutdown hooks | |
| 3932 thread->invoke_shutdown_hooks(); | |
| 3933 } | |
| 3934 | |
| 3935 before_exit(thread); | |
| 3936 | |
| 3937 thread->exit(true); | |
| 3938 | |
| 3939 // Stop VM thread. | |
| 3940 { | |
| 3941 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3942 // GC vm_operations can get caught at the safepoint, and the | |
| 3943 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3944 // to prevent this. The GC vm_operations will not be able to | |
| 3945 // queue until after the vm thread is dead. | |
|
3769
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3946 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
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diff
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|
3947 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
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diff
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|
3948 // stopped; they remain inactive until the process exits. |
|
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diff
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|
3949 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
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|
3950 // but these will not be accessing the heap, just some G1-specific side |
|
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|
3951 // data structures that are not accessed by any other threads but them |
|
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|
3952 // after this point in a terminal safepoint. |
|
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|
3953 |
| 0 | 3954 MutexLocker ml(Heap_lock); |
| 3955 | |
| 3956 VMThread::wait_for_vm_thread_exit(); | |
| 3957 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3958 VMThread::destroy(); | |
| 3959 } | |
| 3960 | |
| 3961 // clean up ideal graph printers | |
| 3962 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3963 IdealGraphPrinter::clean_up(); | |
| 3964 #endif | |
| 3965 | |
| 3966 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3967 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3968 // daemon threads executing native code are still running. But they | |
| 3969 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3970 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3971 | |
| 3972 #ifndef PRODUCT | |
| 3973 // disable function tracing at JNI/JVM barriers | |
| 3974 TraceJNICalls = false; | |
| 3975 TraceJVMCalls = false; | |
| 3976 TraceRuntimeCalls = false; | |
| 3977 #endif | |
| 3978 | |
| 3979 VM_Exit::set_vm_exited(); | |
| 3980 | |
| 3981 notify_vm_shutdown(); | |
| 3982 | |
| 3983 delete thread; | |
| 3984 | |
| 3985 // exit_globals() will delete tty | |
| 3986 exit_globals(); | |
| 3987 | |
| 3988 return true; | |
| 3989 } | |
| 3990 | |
| 3991 | |
| 3992 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3993 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3994 return is_supported_jni_version(version); | |
| 3995 } | |
| 3996 | |
| 3997 | |
| 3998 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3999 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4000 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4001 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 4002 return JNI_FALSE; | |
| 4003 } | |
| 4004 | |
| 4005 | |
| 4006 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4007 // The threads lock must be owned at this point | |
| 4008 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4009 |
|
6e0aac35bfa9
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diff
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|
4010 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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|
4011 // why it is called here. |
|
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|
4012 p->initialize_queues(); |
| 0 | 4013 p->set_next(_thread_list); |
| 4014 _thread_list = p; | |
| 4015 _number_of_threads++; | |
| 4016 oop threadObj = p->threadObj(); | |
| 4017 bool daemon = true; | |
| 4018 // Bootstrapping problem: threadObj can be null for initial | |
| 4019 // JavaThread (or for threads attached via JNI) | |
| 4020 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4021 _number_of_non_daemon_threads++; | |
| 4022 daemon = false; | |
| 4023 } | |
| 4024 | |
| 6197 | 4025 p->set_safepoint_visible(true); |
| 4026 | |
| 0 | 4027 ThreadService::add_thread(p, daemon); |
| 4028 | |
| 4029 // Possible GC point. | |
|
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|
4030 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4031 } |
| 4032 | |
| 4033 void Threads::remove(JavaThread* p) { | |
| 4034 // Extra scope needed for Thread_lock, so we can check | |
| 4035 // that we do not remove thread without safepoint code notice | |
| 4036 { MutexLocker ml(Threads_lock); | |
| 4037 | |
| 4038 assert(includes(p), "p must be present"); | |
| 4039 | |
| 4040 JavaThread* current = _thread_list; | |
| 4041 JavaThread* prev = NULL; | |
| 4042 | |
| 4043 while (current != p) { | |
| 4044 prev = current; | |
| 4045 current = current->next(); | |
| 4046 } | |
| 4047 | |
| 4048 if (prev) { | |
| 4049 prev->set_next(current->next()); | |
| 4050 } else { | |
| 4051 _thread_list = p->next(); | |
| 4052 } | |
| 4053 _number_of_threads--; | |
| 4054 oop threadObj = p->threadObj(); | |
| 4055 bool daemon = true; | |
| 4056 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4057 _number_of_non_daemon_threads--; | |
| 4058 daemon = false; | |
| 4059 | |
| 4060 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4061 // on destroy_vm will wake up. | |
| 4062 if (number_of_non_daemon_threads() == 1) | |
| 4063 Threads_lock->notify_all(); | |
| 4064 } | |
| 4065 ThreadService::remove_thread(p, daemon); | |
| 4066 | |
| 4067 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4068 // the thread might mess around with locks after this point. This can cause it | |
| 4069 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4070 // of this thread since it is removed from the queue. | |
| 4071 p->set_terminated_value(); | |
| 6197 | 4072 |
| 4073 // Now, this thread is not visible to safepoint | |
| 4074 p->set_safepoint_visible(false); | |
| 4075 | |
| 0 | 4076 } // unlock Threads_lock |
| 4077 | |
| 4078 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4079 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4080 } |
| 4081 | |
| 4082 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4083 bool Threads::includes(JavaThread* p) { | |
| 4084 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4085 ALL_JAVA_THREADS(q) { | |
| 4086 if (q == p ) { | |
| 4087 return true; | |
| 4088 } | |
| 4089 } | |
| 4090 return false; | |
| 4091 } | |
| 4092 | |
| 4093 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4094 // but the garbage collector must provide a safe context for them to run. | |
| 4095 // In particular, these things should never be called when the Threads_lock | |
| 4096 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4097 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4098 // all threads gets blocked when exiting or starting). | |
| 4099 | |
|
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|
4100 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4101 ALL_JAVA_THREADS(p) { |
|
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|
4102 p->oops_do(f, cf); |
| 0 | 4103 } |
|
989
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|
4104 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 4105 } |
| 4106 | |
|
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|
4107 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4108 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4109 // root groups. Overhead should be small enough to use all the time, | |
| 4110 // even in sequential code. | |
| 4111 SharedHeap* sh = SharedHeap::heap(); | |
|
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|
4112 // Cannot yet substitute active_workers for n_par_threads |
|
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|
4113 // because of G1CollectedHeap::verify() use of |
|
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|
4114 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
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4042
diff
changeset
|
4115 // turn off parallelism in process_strong_roots while active_workers |
|
bca17e38de00
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4042
diff
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|
4116 // is being used for parallelism elsewhere. |
|
bca17e38de00
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diff
changeset
|
4117 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4118 assert(!is_par || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
4119 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4120 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4121 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4122 ALL_JAVA_THREADS(p) { | |
| 4123 if (p->claim_oops_do(is_par, cp)) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4124 p->oops_do(f, cf); |
| 0 | 4125 } |
| 4126 } | |
| 4127 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3938
diff
changeset
|
4128 if (vmt->claim_oops_do(is_par, cp)) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4129 vmt->oops_do(f, cf); |
|
3979
4dfb2df418f2
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diff
changeset
|
4130 } |
| 0 | 4131 } |
| 4132 | |
| 4133 #ifndef SERIALGC | |
| 4134 // Used by ParallelScavenge | |
| 4135 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4136 ALL_JAVA_THREADS(p) { | |
| 4137 q->enqueue(new ThreadRootsTask(p)); | |
| 4138 } | |
| 4139 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4140 } | |
| 4141 | |
| 4142 // Used by Parallel Old | |
| 4143 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4144 ALL_JAVA_THREADS(p) { | |
| 4145 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4146 } | |
| 4147 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4148 } | |
| 4149 #endif // SERIALGC | |
| 4150 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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parents:
844
diff
changeset
|
4151 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4152 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
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diff
changeset
|
4153 p->nmethods_do(cf); |
| 0 | 4154 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4155 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4156 } |
| 4157 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4158 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
|
4159 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
4160 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4161 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4162 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
4163 |
| 0 | 4164 void Threads::gc_epilogue() { |
| 4165 ALL_JAVA_THREADS(p) { | |
| 4166 p->gc_epilogue(); | |
| 4167 } | |
| 4168 } | |
| 4169 | |
| 4170 void Threads::gc_prologue() { | |
| 4171 ALL_JAVA_THREADS(p) { | |
| 4172 p->gc_prologue(); | |
| 4173 } | |
| 4174 } | |
| 4175 | |
| 4176 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4177 ALL_JAVA_THREADS(p) { | |
| 4178 p->deoptimized_wrt_marked_nmethods(); | |
| 4179 } | |
| 4180 } | |
| 4181 | |
| 4182 | |
| 4183 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4184 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4185 address monitor, bool doLock) { | |
| 4186 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4187 "must grab Threads_lock or be at safepoint"); | |
| 4188 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4189 | |
| 4190 int i = 0; | |
| 4191 { | |
| 4192 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4193 ALL_JAVA_THREADS(p) { | |
| 4194 if (p->is_Compiler_thread()) continue; | |
| 4195 | |
| 4196 address pending = (address)p->current_pending_monitor(); | |
| 4197 if (pending == monitor) { // found a match | |
| 4198 if (i < count) result->append(p); // save the first count matches | |
| 4199 i++; | |
| 4200 } | |
| 4201 } | |
| 4202 } | |
| 4203 return result; | |
| 4204 } | |
| 4205 | |
| 4206 | |
| 4207 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4208 assert(doLock || | |
| 4209 Threads_lock->owned_by_self() || | |
| 4210 SafepointSynchronize::is_at_safepoint(), | |
| 4211 "must grab Threads_lock or be at safepoint"); | |
| 4212 | |
| 4213 // NULL owner means not locked so we can skip the search | |
| 4214 if (owner == NULL) return NULL; | |
| 4215 | |
| 4216 { | |
| 4217 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4218 ALL_JAVA_THREADS(p) { | |
| 4219 // first, see if owner is the address of a Java thread | |
| 4220 if (owner == (address)p) return p; | |
| 4221 } | |
| 4222 } | |
| 4223 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4224 if (UseHeavyMonitors) return NULL; | |
| 4225 | |
| 4226 // | |
| 4227 // If we didn't find a matching Java thread and we didn't force use of | |
| 4228 // heavyweight monitors, then the owner is the stack address of the | |
| 4229 // Lock Word in the owning Java thread's stack. | |
| 4230 // | |
| 4231 JavaThread* the_owner = NULL; | |
| 4232 { | |
| 4233 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4234 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4235 if (q->is_lock_owned(owner)) { |
| 0 | 4236 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
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parents:
669
diff
changeset
|
4237 break; |
| 0 | 4238 } |
| 4239 } | |
| 4240 } | |
| 4241 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4242 return the_owner; | |
| 4243 } | |
| 4244 | |
| 4245 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4246 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4247 char buf[32]; | |
| 4248 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4249 | |
| 4250 st->print_cr("Full thread dump %s (%s %s):", | |
| 4251 Abstract_VM_Version::vm_name(), | |
| 4252 Abstract_VM_Version::vm_release(), | |
| 4253 Abstract_VM_Version::vm_info_string() | |
| 4254 ); | |
| 4255 st->cr(); | |
| 4256 | |
| 4257 #ifndef SERIALGC | |
| 4258 // Dump concurrent locks | |
| 4259 ConcurrentLocksDump concurrent_locks; | |
| 4260 if (print_concurrent_locks) { | |
| 4261 concurrent_locks.dump_at_safepoint(); | |
| 4262 } | |
| 4263 #endif // SERIALGC | |
| 4264 | |
| 4265 ALL_JAVA_THREADS(p) { | |
| 4266 ResourceMark rm; | |
| 4267 p->print_on(st); | |
| 4268 if (print_stacks) { | |
| 4269 if (internal_format) { | |
| 4270 p->trace_stack(); | |
| 4271 } else { | |
| 4272 p->print_stack_on(st); | |
| 4273 } | |
| 4274 } | |
| 4275 st->cr(); | |
| 4276 #ifndef SERIALGC | |
| 4277 if (print_concurrent_locks) { | |
| 4278 concurrent_locks.print_locks_on(p, st); | |
| 4279 } | |
| 4280 #endif // SERIALGC | |
| 4281 } | |
| 4282 | |
| 4283 VMThread::vm_thread()->print_on(st); | |
| 4284 st->cr(); | |
| 4285 Universe::heap()->print_gc_threads_on(st); | |
| 4286 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4287 if (wt != NULL) { |
| 4288 wt->print_on(st); | |
| 4289 st->cr(); | |
| 4290 } | |
| 0 | 4291 CompileBroker::print_compiler_threads_on(st); |
| 4292 st->flush(); | |
| 4293 } | |
| 4294 | |
| 4295 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4296 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4297 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4298 // memory (even in resource area), it might deadlock the error handler. | |
| 4299 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4300 bool found_current = false; | |
| 4301 st->print_cr("Java Threads: ( => current thread )"); | |
| 4302 ALL_JAVA_THREADS(thread) { | |
| 4303 bool is_current = (current == thread); | |
| 4304 found_current = found_current || is_current; | |
| 4305 | |
| 4306 st->print("%s", is_current ? "=>" : " "); | |
| 4307 | |
| 4308 st->print(PTR_FORMAT, thread); | |
| 4309 st->print(" "); | |
| 4310 thread->print_on_error(st, buf, buflen); | |
| 4311 st->cr(); | |
| 4312 } | |
| 4313 st->cr(); | |
| 4314 | |
| 4315 st->print_cr("Other Threads:"); | |
| 4316 if (VMThread::vm_thread()) { | |
| 4317 bool is_current = (current == VMThread::vm_thread()); | |
| 4318 found_current = found_current || is_current; | |
| 4319 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4320 | |
| 4321 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4322 st->print(" "); | |
| 4323 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4324 st->cr(); | |
| 4325 } | |
| 4326 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4327 if (wt != NULL) { | |
| 4328 bool is_current = (current == wt); | |
| 4329 found_current = found_current || is_current; | |
| 4330 st->print("%s", is_current ? "=>" : " "); | |
| 4331 | |
| 4332 st->print(PTR_FORMAT, wt); | |
| 4333 st->print(" "); | |
| 4334 wt->print_on_error(st, buf, buflen); | |
| 4335 st->cr(); | |
| 4336 } | |
| 4337 if (!found_current) { | |
| 4338 st->cr(); | |
| 4339 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4340 current->print_on_error(st, buf, buflen); | |
| 4341 st->cr(); | |
| 4342 } | |
| 4343 } | |
| 4344 | |
| 1878 | 4345 // Internal SpinLock and Mutex |
| 4346 // Based on ParkEvent | |
| 4347 | |
| 4348 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4349 // |
| 1878 | 4350 // We employ SpinLocks _only for low-contention, fixed-length |
| 4351 // short-duration critical sections where we're concerned | |
| 4352 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4353 // The mux construct provides a spin-then-block mutual exclusion | |
| 4354 // mechanism. | |
| 4355 // | |
| 4356 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4357 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4358 // for the JVM to devolve to yielding with little progress. This is true | |
| 4359 // despite the fact that the critical sections protected by ListLock are | |
| 4360 // extremely short. | |
| 0 | 4361 // |
| 1878 | 4362 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4363 // We should make this a 1st-class type, integrated into the lock | |
| 4364 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4365 // should have sufficient padding to avoid false-sharing and excessive | |
| 4366 // cache-coherency traffic. | |
| 4367 | |
| 4368 | |
| 4369 typedef volatile int SpinLockT ; | |
| 4370 | |
| 4371 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4372 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4373 return ; // normal fast-path return | |
| 4374 } | |
| 4375 | |
| 4376 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4377 TEVENT (SpinAcquire - ctx) ; | |
| 4378 int ctr = 0 ; | |
| 4379 int Yields = 0 ; | |
| 0 | 4380 for (;;) { |
| 1878 | 4381 while (*adr != 0) { |
| 4382 ++ctr ; | |
| 4383 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4384 if (Yields > 5) { | |
| 4385 // Consider using a simple NakedSleep() instead. | |
| 4386 // Then SpinAcquire could be called by non-JVM threads | |
| 4387 Thread::current()->_ParkEvent->park(1) ; | |
| 4388 } else { | |
| 4389 os::NakedYield() ; | |
| 4390 ++Yields ; | |
| 4391 } | |
| 4392 } else { | |
| 4393 SpinPause() ; | |
| 0 | 4394 } |
| 1878 | 4395 } |
| 4396 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4397 } |
| 4398 } | |
| 4399 | |
| 1878 | 4400 void Thread::SpinRelease (volatile int * adr) { |
| 4401 assert (*adr != 0, "invariant") ; | |
| 4402 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4403 // Roach-motel semantics. | |
| 4404 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4405 // but prior LDs and STs within the critical section can't be allowed | |
| 4406 // to reorder or float past the ST that releases the lock. | |
| 4407 *adr = 0 ; | |
| 0 | 4408 } |
| 4409 | |
| 1878 | 4410 // muxAcquire and muxRelease: |
| 4411 // | |
| 4412 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4413 // The LSB of the word is set IFF the lock is held. | |
| 4414 // The remainder of the word points to the head of a singly-linked list | |
| 4415 // of threads blocked on the lock. | |
| 4416 // | |
| 4417 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4418 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4419 // minimizing the peak number of extant ParkEvent instances then | |
| 4420 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4421 // as certain invariants were satisfied. Specifically, care would need | |
| 4422 // to be taken with regards to consuming unpark() "permits". | |
| 4423 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4424 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4425 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4426 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4427 // One way around this would be to widen the restricted-range semaphore | |
| 4428 // implemented in park(). Another alternative would be to provide | |
| 4429 // multiple instances of the PlatformEvent() for each thread. One | |
| 4430 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4431 // | |
| 4432 // * Usage: | |
| 4433 // -- Only as leaf locks | |
| 4434 // -- for short-term locking only as muxAcquire does not perform | |
| 4435 // thread state transitions. | |
| 4436 // | |
| 4437 // Alternatives: | |
| 4438 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4439 // but with parking or spin-then-park instead of pure spinning. | |
| 4440 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4441 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4442 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4443 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4444 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4445 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4446 // boundaries by using placement-new. | |
| 4447 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4448 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4449 // The validity of the backlinks must be ratified before we trust the value. | |
| 4450 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4451 // the forward links, which are always trustworthy. | |
| 4452 // * Add a successor indication. The LockWord is currently encoded as | |
| 4453 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4454 // to provide the usual futile-wakeup optimization. | |
| 4455 // See RTStt for details. | |
| 4456 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4457 // | |
| 4458 | |
| 4459 | |
| 4460 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4461 enum MuxBits { LOCKBIT = 1 } ; | |
| 4462 | |
| 4463 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4464 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4465 if (w == 0) return ; | |
| 4466 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4467 return ; | |
| 4468 } | |
| 4469 | |
| 4470 TEVENT (muxAcquire - Contention) ; | |
| 4471 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4472 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4473 for (;;) { |
| 1878 | 4474 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4475 | |
| 4476 // Optional spin phase: spin-then-park strategy | |
| 4477 while (--its >= 0) { | |
| 4478 w = *Lock ; | |
| 4479 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4480 return ; | |
| 4481 } | |
| 4482 } | |
| 4483 | |
| 4484 Self->reset() ; | |
| 4485 Self->OnList = intptr_t(Lock) ; | |
| 4486 // The following fence() isn't _strictly necessary as the subsequent | |
| 4487 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4488 OrderAccess::fence(); | |
| 4489 for (;;) { | |
| 4490 w = *Lock ; | |
| 4491 if ((w & LOCKBIT) == 0) { | |
| 4492 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4493 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4494 return ; | |
| 4495 } | |
| 4496 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4497 } |
| 1878 | 4498 assert (w & LOCKBIT, "invariant") ; |
| 4499 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4500 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4501 } | |
| 4502 | |
| 4503 while (Self->OnList != 0) { | |
| 4504 Self->park() ; | |
| 4505 } | |
| 0 | 4506 } |
| 4507 } | |
| 4508 | |
| 1878 | 4509 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4510 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4511 if (w == 0) return ; | |
| 4512 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4513 return ; | |
| 4514 } | |
| 4515 | |
| 4516 TEVENT (muxAcquire - Contention) ; | |
| 4517 ParkEvent * ReleaseAfter = NULL ; | |
| 4518 if (ev == NULL) { | |
| 4519 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4520 } | |
| 4521 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4522 for (;;) { | |
| 4523 guarantee (ev->OnList == 0, "invariant") ; | |
| 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 if (ReleaseAfter != NULL) { | |
| 4531 ParkEvent::Release (ReleaseAfter) ; | |
| 4532 } | |
| 4533 return ; | |
| 4534 } | |
| 4535 } | |
| 4536 | |
| 4537 ev->reset() ; | |
| 4538 ev->OnList = intptr_t(Lock) ; | |
| 4539 // The following fence() isn't _strictly necessary as the subsequent | |
| 4540 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4541 OrderAccess::fence(); | |
| 4542 for (;;) { | |
| 4543 w = *Lock ; | |
| 4544 if ((w & LOCKBIT) == 0) { | |
| 4545 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4546 ev->OnList = 0 ; | |
| 4547 // We call ::Release while holding the outer lock, thus | |
| 4548 // artificially lengthening the critical section. | |
| 4549 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4550 // after we've dropped the outer lock. | |
| 4551 if (ReleaseAfter != NULL) { | |
| 4552 ParkEvent::Release (ReleaseAfter) ; | |
| 4553 } | |
| 4554 return ; | |
| 4555 } | |
| 4556 continue ; // Interference -- *Lock changed -- Just retry | |
| 4557 } | |
| 4558 assert (w & LOCKBIT, "invariant") ; | |
| 4559 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4560 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4561 } | |
| 4562 | |
| 4563 while (ev->OnList != 0) { | |
| 4564 ev->park() ; | |
| 4565 } | |
| 4566 } | |
| 4567 } | |
| 4568 | |
| 4569 // Release() must extract a successor from the list and then wake that thread. | |
| 4570 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4571 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4572 // Release() would : | |
| 4573 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4574 // (B) Extract a successor from the private list "in-hand" | |
| 4575 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4576 // If there were any newly arrived threads and the CAS() would fail. | |
| 4577 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4578 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4579 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4580 // The wakee would be responsible for reattaching and remerging before it | |
| 4581 // competed for the lock. | |
| 4582 // | |
| 4583 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4584 // multiple concurrent pushers, but only one popper or detacher. | |
| 4585 // This implementation pops from the head of the list. This is unfair, | |
| 4586 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4587 // (We wake recently run threads first). | |
| 4588 | |
| 4589 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4590 for (;;) { | |
| 4591 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4592 assert (w & LOCKBIT, "invariant") ; | |
| 4593 if (w == LOCKBIT) return ; | |
| 4594 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4595 assert (List != NULL, "invariant") ; | |
| 4596 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4597 ParkEvent * nxt = List->ListNext ; | |
| 4598 | |
| 4599 // The following CAS() releases the lock and pops the head element. | |
| 4600 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4601 continue ; | |
| 4602 } | |
| 4603 List->OnList = 0 ; | |
| 4604 OrderAccess::fence() ; | |
| 4605 List->unpark () ; | |
| 4606 return ; | |
| 4607 } | |
| 4608 } | |
| 4609 | |
| 4610 | |
| 0 | 4611 void Threads::verify() { |
| 4612 ALL_JAVA_THREADS(p) { | |
| 4613 p->verify(); | |
| 4614 } | |
| 4615 VMThread* thread = VMThread::vm_thread(); | |
| 4616 if (thread != NULL) thread->verify(); | |
| 4617 } |