Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 6872:7b5885dadbdc
8000617: It should be possible to allocate memory without the VM dying.
Reviewed-by: coleenp, kamg
| author | nloodin |
|---|---|
| date | Wed, 17 Oct 2012 17:36:48 +0200 |
| parents | 5876f980ea19 |
| children | 716c64bda5ba |
| 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) |
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180 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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181 AllocFailStrategy::RETURN_NULL); |
| 0 | 182 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 183 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 184 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 185 "JavaThread alignment code overflowed allocated storage"); | |
| 186 if (TraceBiasedLocking) { | |
| 187 if (aligned_addr != real_malloc_addr) | |
| 188 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 189 real_malloc_addr, aligned_addr); | |
| 190 } | |
| 191 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 192 return aligned_addr; | |
| 193 } else { | |
| 6197 | 194 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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195 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 196 } |
| 197 } | |
| 198 | |
| 199 void Thread::operator delete(void* p) { | |
| 200 if (UseBiasedLocking) { | |
| 201 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 202 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 203 } else { |
| 6197 | 204 FreeHeap(p, mtThread); |
| 0 | 205 } |
| 206 } | |
| 207 | |
| 208 | |
| 209 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 210 // JavaThread | |
| 211 | |
| 212 | |
| 213 Thread::Thread() { | |
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214 // stack and get_thread |
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215 set_stack_base(NULL); |
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216 set_stack_size(0); |
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217 set_self_raw_id(0); |
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218 set_lgrp_id(-1); |
| 0 | 219 |
| 220 // allocated data structures | |
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221 set_osthread(NULL); |
| 6197 | 222 set_resource_area(new (mtThread)ResourceArea()); |
| 223 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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224 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
| 0 | 225 set_active_handles(NULL); |
| 226 set_free_handle_block(NULL); | |
| 227 set_last_handle_mark(NULL); | |
| 228 | |
| 229 // This initial value ==> never claimed. | |
| 230 _oops_do_parity = 0; | |
| 231 | |
| 232 // the handle mark links itself to last_handle_mark | |
| 233 new HandleMark(this); | |
| 234 | |
| 235 // plain initialization | |
| 236 debug_only(_owned_locks = NULL;) | |
| 237 debug_only(_allow_allocation_count = 0;) | |
| 238 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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239 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 240 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 241 _jvmti_env_iteration_count = 0; | |
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242 set_allocated_bytes(0); |
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243 set_trace_buffer(NULL); |
| 0 | 244 _vm_operation_started_count = 0; |
| 245 _vm_operation_completed_count = 0; | |
| 246 _current_pending_monitor = NULL; | |
| 247 _current_pending_monitor_is_from_java = true; | |
| 248 _current_waiting_monitor = NULL; | |
| 249 _num_nested_signal = 0; | |
| 250 omFreeList = NULL ; | |
| 251 omFreeCount = 0 ; | |
| 252 omFreeProvision = 32 ; | |
| 1587 | 253 omInUseList = NULL ; |
| 254 omInUseCount = 0 ; | |
| 0 | 255 |
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256 #ifdef ASSERT |
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257 _visited_for_critical_count = false; |
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258 #endif |
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259 |
| 0 | 260 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 261 _suspend_flags = 0; | |
| 262 | |
| 263 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 264 _hashStateX = os::random() ; | |
| 265 _hashStateY = 842502087 ; | |
| 266 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 267 _hashStateW = 273326509 ; | |
| 268 | |
| 269 _OnTrap = 0 ; | |
| 270 _schedctl = NULL ; | |
| 271 _Stalled = 0 ; | |
| 272 _TypeTag = 0x2BAD ; | |
| 273 | |
| 274 // Many of the following fields are effectively final - immutable | |
| 275 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 276 // construct until the _MutexEvent is initialized ... | |
| 277 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 278 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 279 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 280 // and ::Release() | |
| 281 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 282 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 283 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 284 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 285 | |
| 286 #ifdef CHECK_UNHANDLED_OOPS | |
| 287 if (CheckUnhandledOops) { | |
| 288 _unhandled_oops = new UnhandledOops(this); | |
| 289 } | |
| 290 #endif // CHECK_UNHANDLED_OOPS | |
| 291 #ifdef ASSERT | |
| 292 if (UseBiasedLocking) { | |
| 293 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 294 assert(this == _real_malloc_address || | |
| 295 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 296 "bug in forced alignment of thread objects"); | |
| 297 } | |
| 298 #endif /* ASSERT */ | |
| 299 } | |
| 300 | |
| 301 void Thread::initialize_thread_local_storage() { | |
| 302 // Note: Make sure this method only calls | |
| 303 // non-blocking operations. Otherwise, it might not work | |
| 304 // with the thread-startup/safepoint interaction. | |
| 305 | |
| 306 // During Java thread startup, safepoint code should allow this | |
| 307 // method to complete because it may need to allocate memory to | |
| 308 // store information for the new thread. | |
| 309 | |
| 310 // initialize structure dependent on thread local storage | |
| 311 ThreadLocalStorage::set_thread(this); | |
| 312 } | |
| 313 | |
| 314 void Thread::record_stack_base_and_size() { | |
| 315 set_stack_base(os::current_stack_base()); | |
| 316 set_stack_size(os::current_stack_size()); | |
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317 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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318 // in initialize_thread(). Without the adjustment, stack size is |
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319 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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320 // So far, only Solaris has real implementation of initialize_thread(). |
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321 // |
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322 // set up any platform-specific state. |
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323 os::initialize_thread(this); |
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324 |
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325 #if INCLUDE_NMT |
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326 // record thread's native stack, stack grows downward |
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327 if (MemTracker::is_on()) { |
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328 address stack_low_addr = stack_base() - stack_size(); |
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329 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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330 CURRENT_PC); |
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331 } |
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332 #endif // INCLUDE_NMT |
| 0 | 333 } |
| 334 | |
| 335 | |
| 336 Thread::~Thread() { | |
| 337 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 338 ObjectSynchronizer::omFlush (this) ; | |
| 339 | |
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340 // stack_base can be NULL if the thread is never started or exited before |
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341 // record_stack_base_and_size called. Although, we would like to ensure |
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342 // that all started threads do call record_stack_base_and_size(), there is |
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343 // not proper way to enforce that. |
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344 #if INCLUDE_NMT |
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345 if (_stack_base != NULL) { |
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346 address low_stack_addr = stack_base() - stack_size(); |
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347 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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348 } |
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349 #endif // INCLUDE_NMT |
| 6197 | 350 |
| 0 | 351 // deallocate data structures |
| 352 delete resource_area(); | |
| 353 // since the handle marks are using the handle area, we have to deallocated the root | |
| 354 // handle mark before deallocating the thread's handle area, | |
| 355 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 356 delete last_handle_mark(); | |
| 357 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 358 | |
| 359 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 360 // We NULL out the fields for good hygiene. | |
| 361 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 362 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 363 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 364 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 365 | |
| 366 delete handle_area(); | |
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367 delete metadata_handles(); |
| 0 | 368 |
| 369 // osthread() can be NULL, if creation of thread failed. | |
| 370 if (osthread() != NULL) os::free_thread(osthread()); | |
| 371 | |
| 372 delete _SR_lock; | |
| 373 | |
| 374 // clear thread local storage if the Thread is deleting itself | |
| 375 if (this == Thread::current()) { | |
| 376 ThreadLocalStorage::set_thread(NULL); | |
| 377 } else { | |
| 378 // In the case where we're not the current thread, invalidate all the | |
| 379 // caches in case some code tries to get the current thread or the | |
| 380 // thread that was destroyed, and gets stale information. | |
| 381 ThreadLocalStorage::invalidate_all(); | |
| 382 } | |
| 383 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 384 } | |
| 385 | |
| 386 // NOTE: dummy function for assertion purpose. | |
| 387 void Thread::run() { | |
| 388 ShouldNotReachHere(); | |
| 389 } | |
| 390 | |
| 391 #ifdef ASSERT | |
| 392 // Private method to check for dangling thread pointer | |
| 393 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 394 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 395 "possibility of dangling Thread pointer"); | |
| 396 } | |
| 397 #endif | |
| 398 | |
| 399 | |
| 400 #ifndef PRODUCT | |
| 401 // Tracing method for basic thread operations | |
| 402 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 403 if (!TraceThreadEvents) return; | |
| 404 ResourceMark rm; | |
| 405 ThreadCritical tc; | |
| 406 const char *name = "non-Java thread"; | |
| 407 int prio = -1; | |
| 408 if (thread->is_Java_thread() | |
| 409 && !thread->is_Compiler_thread()) { | |
| 410 // The Threads_lock must be held to get information about | |
| 411 // this thread but may not be in some situations when | |
| 412 // tracing thread events. | |
| 413 bool release_Threads_lock = false; | |
| 414 if (!Threads_lock->owned_by_self()) { | |
| 415 Threads_lock->lock(); | |
| 416 release_Threads_lock = true; | |
| 417 } | |
| 418 JavaThread* jt = (JavaThread *)thread; | |
| 419 name = (char *)jt->get_thread_name(); | |
| 420 oop thread_oop = jt->threadObj(); | |
| 421 if (thread_oop != NULL) { | |
| 422 prio = java_lang_Thread::priority(thread_oop); | |
| 423 } | |
| 424 if (release_Threads_lock) { | |
| 425 Threads_lock->unlock(); | |
| 426 } | |
| 427 } | |
| 428 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 429 } | |
| 430 #endif | |
| 431 | |
| 432 | |
| 433 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 434 trace("get priority", thread); | |
| 435 ThreadPriority priority; | |
| 436 // Can return an error! | |
| 437 (void)os::get_priority(thread, priority); | |
| 438 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 439 return priority; | |
| 440 } | |
| 441 | |
| 442 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 443 trace("set priority", thread); | |
| 444 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 445 // Can return an error! | |
| 446 (void)os::set_priority(thread, priority); | |
| 447 } | |
| 448 | |
| 449 | |
| 450 void Thread::start(Thread* thread) { | |
| 451 trace("start", thread); | |
| 452 // Start is different from resume in that its safety is guaranteed by context or | |
| 453 // being called from a Java method synchronized on the Thread object. | |
| 454 if (!DisableStartThread) { | |
| 455 if (thread->is_Java_thread()) { | |
| 456 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 457 // Can not set it after the thread started because we do not know the | |
| 458 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 459 // in SLEEPING or some other state. | |
| 460 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 461 java_lang_Thread::RUNNABLE); | |
| 462 } | |
| 463 os::start_thread(thread); | |
| 464 } | |
| 465 } | |
| 466 | |
| 467 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 468 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 469 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 470 VMThread::execute(vm_stop); | |
| 471 } | |
| 472 | |
| 473 | |
| 474 // | |
| 475 // Check if an external suspend request has completed (or has been | |
| 476 // cancelled). Returns true if the thread is externally suspended and | |
| 477 // false otherwise. | |
| 478 // | |
| 479 // The bits parameter returns information about the code path through | |
| 480 // the routine. Useful for debugging: | |
| 481 // | |
| 482 // set in is_ext_suspend_completed(): | |
| 483 // 0x00000001 - routine was entered | |
| 484 // 0x00000010 - routine return false at end | |
| 485 // 0x00000100 - thread exited (return false) | |
| 486 // 0x00000200 - suspend request cancelled (return false) | |
| 487 // 0x00000400 - thread suspended (return true) | |
| 488 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 489 // 0x00002000 - thread is native and walkable (return true) | |
| 490 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 491 // | |
| 492 // set in wait_for_ext_suspend_completion(): | |
| 493 // 0x00010000 - routine was entered | |
| 494 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 495 // 0x00040000 - thread suspended before loop (return true) | |
| 496 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 497 // 0x00100000 - thread suspended in loop (return true) | |
| 498 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 499 // | |
| 500 | |
| 501 // Helper class for tracing suspend wait debug bits. | |
| 502 // | |
| 503 // 0x00000100 indicates that the target thread exited before it could | |
| 504 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 505 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 506 // count as wait failures either. | |
| 507 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 508 | |
| 509 class TraceSuspendDebugBits : public StackObj { | |
| 510 private: | |
| 511 JavaThread * jt; | |
| 512 bool is_wait; | |
| 513 bool called_by_wait; // meaningful when !is_wait | |
| 514 uint32_t * bits; | |
| 515 | |
| 516 public: | |
| 517 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 518 uint32_t *_bits) { | |
| 519 jt = _jt; | |
| 520 is_wait = _is_wait; | |
| 521 called_by_wait = _called_by_wait; | |
| 522 bits = _bits; | |
| 523 } | |
| 524 | |
| 525 ~TraceSuspendDebugBits() { | |
| 526 if (!is_wait) { | |
| 527 #if 1 | |
| 528 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 529 // That trace is very chatty. | |
| 530 return; | |
| 531 #else | |
| 532 if (!called_by_wait) { | |
| 533 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 534 // trace calls to it from wait_for_ext_suspend_completion() | |
| 535 return; | |
| 536 } | |
| 537 #endif | |
| 538 } | |
| 539 | |
| 540 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 541 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 542 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 543 ResourceMark rm; | |
| 544 | |
| 545 tty->print_cr( | |
| 546 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 547 jt->get_thread_name(), *bits); | |
| 548 | |
| 549 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 550 } | |
| 551 } | |
| 552 } | |
| 553 }; | |
| 554 #undef DEBUG_FALSE_BITS | |
| 555 | |
| 556 | |
| 557 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 558 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 559 | |
| 560 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 561 bool do_trans_retry; // flag to force the retry | |
| 562 | |
| 563 *bits |= 0x00000001; | |
| 564 | |
| 565 do { | |
| 566 do_trans_retry = false; | |
| 567 | |
| 568 if (is_exiting()) { | |
| 569 // Thread is in the process of exiting. This is always checked | |
| 570 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 571 *bits |= 0x00000100; | |
| 572 return false; | |
| 573 } | |
| 574 | |
| 575 if (!is_external_suspend()) { | |
| 576 // Suspend request is cancelled. This is always checked before | |
| 577 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 578 // confusing the thread that made the suspend request. | |
| 579 *bits |= 0x00000200; | |
| 580 return false; | |
| 581 } | |
| 582 | |
| 583 if (is_ext_suspended()) { | |
| 584 // thread is suspended | |
| 585 *bits |= 0x00000400; | |
| 586 return true; | |
| 587 } | |
| 588 | |
| 589 // Now that we no longer do hard suspends of threads running | |
| 590 // native code, the target thread can be changing thread state | |
| 591 // while we are in this routine: | |
| 592 // | |
| 593 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 594 // | |
| 595 // We save a copy of the thread state as observed at this moment | |
| 596 // and make our decision about suspend completeness based on the | |
| 597 // copy. This closes the race where the thread state is seen as | |
| 598 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 599 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 600 JavaThreadState save_state = thread_state(); | |
| 601 | |
| 602 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 603 // If the thread's state is _thread_blocked and this blocking | |
| 604 // condition is known to be equivalent to a suspend, then we can | |
| 605 // consider the thread to be externally suspended. This means that | |
| 606 // the code that sets _thread_blocked has been modified to do | |
| 607 // self-suspension if the blocking condition releases. We also | |
| 608 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 609 // the _thread_blocked with self-suspension check. | |
| 610 // | |
| 611 // Return true since we wouldn't be here unless there was still an | |
| 612 // external suspend request. | |
| 613 *bits |= 0x00001000; | |
| 614 return true; | |
| 615 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 616 // Threads running native code will self-suspend on native==>VM/Java | |
| 617 // transitions. If its stack is walkable (should always be the case | |
| 618 // unless this function is called before the actual java_suspend() | |
| 619 // call), then the wait is done. | |
| 620 *bits |= 0x00002000; | |
| 621 return true; | |
| 622 } else if (!called_by_wait && !did_trans_retry && | |
| 623 save_state == _thread_in_native_trans && | |
| 624 frame_anchor()->walkable()) { | |
| 625 // The thread is transitioning from thread_in_native to another | |
| 626 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 627 // will force the thread to self-suspend. If it hasn't gotten | |
| 628 // there yet we may have caught the thread in-between the native | |
| 629 // code check above and the self-suspend. Lucky us. If we were | |
| 630 // called by wait_for_ext_suspend_completion(), then it | |
| 631 // will be doing the retries so we don't have to. | |
| 632 // | |
| 633 // Since we use the saved thread state in the if-statement above, | |
| 634 // there is a chance that the thread has already transitioned to | |
| 635 // _thread_blocked by the time we get here. In that case, we will | |
| 636 // make a single unnecessary pass through the logic below. This | |
| 637 // doesn't hurt anything since we still do the trans retry. | |
| 638 | |
| 639 *bits |= 0x00004000; | |
| 640 | |
| 641 // Once the thread leaves thread_in_native_trans for another | |
| 642 // thread state, we break out of this retry loop. We shouldn't | |
| 643 // need this flag to prevent us from getting back here, but | |
| 644 // sometimes paranoia is good. | |
| 645 did_trans_retry = true; | |
| 646 | |
| 647 // We wait for the thread to transition to a more usable state. | |
| 648 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 649 // We used to do an "os::yield_all(i)" call here with the intention | |
| 650 // that yielding would increase on each retry. However, the parameter | |
| 651 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 652 // on the SR_lock below provides a much more predictable scale up for | |
| 653 // the delay. It also provides a simple/direct point to check for any | |
| 654 // safepoint requests from the VMThread | |
| 655 | |
| 656 // temporarily drops SR_lock while doing wait with safepoint check | |
| 657 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 658 // and increase delay with each retry | |
| 659 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 660 | |
| 661 // check the actual thread state instead of what we saved above | |
| 662 if (thread_state() != _thread_in_native_trans) { | |
| 663 // the thread has transitioned to another thread state so | |
| 664 // try all the checks (except this one) one more time. | |
| 665 do_trans_retry = true; | |
| 666 break; | |
| 667 } | |
| 668 } // end retry loop | |
| 669 | |
| 670 | |
| 671 } | |
| 672 } while (do_trans_retry); | |
| 673 | |
| 674 *bits |= 0x00000010; | |
| 675 return false; | |
| 676 } | |
| 677 | |
| 678 // | |
| 679 // Wait for an external suspend request to complete (or be cancelled). | |
| 680 // Returns true if the thread is externally suspended and false otherwise. | |
| 681 // | |
| 682 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 683 uint32_t *bits) { | |
| 684 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 685 false /* !called_by_wait */, bits); | |
| 686 | |
| 687 // local flag copies to minimize SR_lock hold time | |
| 688 bool is_suspended; | |
| 689 bool pending; | |
| 690 uint32_t reset_bits; | |
| 691 | |
| 692 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 693 *bits |= 0x00010000; | |
| 694 | |
| 695 // We use reset_bits to reinitialize the bits value at the top of | |
| 696 // each retry loop. This allows the caller to make use of any | |
| 697 // unused bits for their own marking purposes. | |
| 698 reset_bits = *bits; | |
| 699 | |
| 700 { | |
| 701 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 702 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 703 delay, bits); | |
| 704 pending = is_external_suspend(); | |
| 705 } | |
| 706 // must release SR_lock to allow suspension to complete | |
| 707 | |
| 708 if (!pending) { | |
| 709 // A cancelled suspend request is the only false return from | |
| 710 // is_ext_suspend_completed() that keeps us from entering the | |
| 711 // retry loop. | |
| 712 *bits |= 0x00020000; | |
| 713 return false; | |
| 714 } | |
| 715 | |
| 716 if (is_suspended) { | |
| 717 *bits |= 0x00040000; | |
| 718 return true; | |
| 719 } | |
| 720 | |
| 721 for (int i = 1; i <= retries; i++) { | |
| 722 *bits = reset_bits; // reinit to only track last retry | |
| 723 | |
| 724 // We used to do an "os::yield_all(i)" call here with the intention | |
| 725 // that yielding would increase on each retry. However, the parameter | |
| 726 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 727 // on the SR_lock below provides a much more predictable scale up for | |
| 728 // the delay. It also provides a simple/direct point to check for any | |
| 729 // safepoint requests from the VMThread | |
| 730 | |
| 731 { | |
| 732 MutexLocker ml(SR_lock()); | |
| 733 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 734 // can also call this) and increase delay with each retry | |
| 735 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 736 | |
| 737 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 738 delay, bits); | |
| 739 | |
| 740 // It is possible for the external suspend request to be cancelled | |
| 741 // (by a resume) before the actual suspend operation is completed. | |
| 742 // Refresh our local copy to see if we still need to wait. | |
| 743 pending = is_external_suspend(); | |
| 744 } | |
| 745 | |
| 746 if (!pending) { | |
| 747 // A cancelled suspend request is the only false return from | |
| 748 // is_ext_suspend_completed() that keeps us from staying in the | |
| 749 // retry loop. | |
| 750 *bits |= 0x00080000; | |
| 751 return false; | |
| 752 } | |
| 753 | |
| 754 if (is_suspended) { | |
| 755 *bits |= 0x00100000; | |
| 756 return true; | |
| 757 } | |
| 758 } // end retry loop | |
| 759 | |
| 760 // thread did not suspend after all our retries | |
| 761 *bits |= 0x00200000; | |
| 762 return false; | |
| 763 } | |
| 764 | |
| 765 #ifndef PRODUCT | |
| 766 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 767 | |
| 768 // This should not need to be atomic as the only way for simultaneous | |
| 769 // updates is via interrupts. Even then this should be rare or non-existant | |
| 770 // and we don't care that much anyway. | |
| 771 | |
| 772 int index = _jmp_ring_index; | |
| 773 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 774 _jmp_ring[index]._target = (intptr_t) target; | |
| 775 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 776 _jmp_ring[index]._file = file; | |
| 777 _jmp_ring[index]._line = line; | |
| 778 } | |
| 779 #endif /* PRODUCT */ | |
| 780 | |
| 781 // Called by flat profiler | |
| 782 // Callers have already called wait_for_ext_suspend_completion | |
| 783 // The assertion for that is currently too complex to put here: | |
| 784 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 785 bool gotframe = false; | |
| 786 // self suspension saves needed state. | |
| 787 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 788 *_fr = pd_last_frame(); | |
| 789 gotframe = true; | |
| 790 } | |
| 791 return gotframe; | |
| 792 } | |
| 793 | |
| 794 void Thread::interrupt(Thread* thread) { | |
| 795 trace("interrupt", thread); | |
| 796 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 797 os::interrupt(thread); | |
| 798 } | |
| 799 | |
| 800 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 801 trace("is_interrupted", thread); | |
| 802 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 803 // Note: If clear_interrupted==false, this simply fetches and | |
| 804 // returns the value of the field osthread()->interrupted(). | |
| 805 return os::is_interrupted(thread, clear_interrupted); | |
| 806 } | |
| 807 | |
| 808 | |
| 809 // GC Support | |
| 810 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 811 jint thread_parity = _oops_do_parity; | |
| 812 if (thread_parity != strong_roots_parity) { | |
| 813 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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814 if (res == thread_parity) { |
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815 return true; |
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816 } else { |
| 0 | 817 guarantee(res == strong_roots_parity, "Or else what?"); |
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818 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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819 "Should only fail when parallel."); |
| 0 | 820 return false; |
| 821 } | |
| 822 } | |
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823 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 824 "Should only fail when parallel."); |
| 825 return false; | |
| 826 } | |
| 827 | |
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828 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 829 active_handles()->oops_do(f); |
| 830 // Do oop for ThreadShadow | |
| 831 f->do_oop((oop*)&_pending_exception); | |
| 832 handle_area()->oops_do(f); | |
| 833 } | |
| 834 | |
|
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835 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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836 // no nmethods in a generic thread... |
| 0 | 837 } |
| 838 | |
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839 void Thread::metadata_do(void f(Metadata*)) { |
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840 if (metadata_handles() != NULL) { |
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841 for (int i = 0; i< metadata_handles()->length(); i++) { |
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842 f(metadata_handles()->at(i)); |
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843 } |
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844 } |
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845 } |
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846 |
| 0 | 847 void Thread::print_on(outputStream* st) const { |
| 848 // get_priority assumes osthread initialized | |
| 849 if (osthread() != NULL) { | |
| 6766 | 850 int os_prio; |
| 851 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 852 st->print("os_prio=%d ", os_prio); | |
| 853 } | |
| 854 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 855 osthread()->print_on(st); |
| 856 } | |
| 857 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 858 } | |
| 859 | |
| 860 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 861 // any lock or allocate memory. | |
| 862 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 863 if (is_VM_thread()) st->print("VMThread"); | |
| 864 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 865 else if (is_Java_thread()) st->print("JavaThread"); | |
| 866 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 867 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 868 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 869 else st->print("Thread"); | |
| 870 | |
| 871 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 872 _stack_base - _stack_size, _stack_base); | |
| 873 | |
| 874 if (osthread()) { | |
| 875 st->print(" [id=%d]", osthread()->thread_id()); | |
| 876 } | |
| 877 } | |
| 878 | |
| 879 #ifdef ASSERT | |
| 880 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 881 Monitor *cur = _owned_locks; | |
| 882 if (cur == NULL) { | |
| 883 st->print(" (no locks) "); | |
| 884 } else { | |
| 885 st->print_cr(" Locks owned:"); | |
| 886 while(cur) { | |
| 887 cur->print_on(st); | |
| 888 cur = cur->next(); | |
| 889 } | |
| 890 } | |
| 891 } | |
| 892 | |
| 893 static int ref_use_count = 0; | |
| 894 | |
| 895 bool Thread::owns_locks_but_compiled_lock() const { | |
| 896 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 897 if (cur != Compile_lock) return true; | |
| 898 } | |
| 899 return false; | |
| 900 } | |
| 901 | |
| 902 | |
| 903 #endif | |
| 904 | |
| 905 #ifndef PRODUCT | |
| 906 | |
| 907 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 908 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 909 // no threads which allow_vm_block's are held | |
| 910 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 911 // Check if current thread is allowed to block at a safepoint | |
| 912 if (!(_allow_safepoint_count == 0)) | |
| 913 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 914 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 915 fatal("LEAF method calling lock?"); | |
| 916 } | |
| 917 | |
| 918 #ifdef ASSERT | |
| 919 if (potential_vm_operation && is_Java_thread() | |
| 920 && !Universe::is_bootstrapping()) { | |
| 921 // Make sure we do not hold any locks that the VM thread also uses. | |
| 922 // This could potentially lead to deadlocks | |
| 923 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 924 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 925 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 926 // since it is used to transfer control between JavaThreads and the VMThread | |
| 927 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 928 if ( (cur->allow_vm_block() && | |
| 929 cur != Threads_lock && | |
| 930 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 931 cur != VMOperationRequest_lock && | |
| 932 cur != VMOperationQueue_lock) || | |
| 933 cur->rank() == Mutex::special) { | |
| 934 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 935 } | |
| 936 } | |
| 937 } | |
| 938 | |
| 939 if (GCALotAtAllSafepoints) { | |
| 940 // We could enter a safepoint here and thus have a gc | |
| 941 InterfaceSupport::check_gc_alot(); | |
| 942 } | |
| 943 #endif | |
| 944 } | |
| 945 #endif | |
| 946 | |
| 947 bool Thread::is_in_stack(address adr) const { | |
| 948 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 949 address end = os::current_stack_pointer(); | |
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950 // Allow non Java threads to call this without stack_base |
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951 if (_stack_base == NULL) return true; |
| 0 | 952 if (stack_base() >= adr && adr >= end) return true; |
| 953 | |
| 954 return false; | |
| 955 } | |
| 956 | |
| 957 | |
| 958 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 959 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 960 // used for compilation in the future. If that change is made, the need for these methods | |
| 961 // should be revisited, and they should be removed if possible. | |
| 962 | |
| 963 bool Thread::is_lock_owned(address adr) const { | |
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964 return on_local_stack(adr); |
| 0 | 965 } |
| 966 | |
| 967 bool Thread::set_as_starting_thread() { | |
| 968 // NOTE: this must be called inside the main thread. | |
| 969 return os::create_main_thread((JavaThread*)this); | |
| 970 } | |
| 971 | |
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972 static void initialize_class(Symbol* class_name, TRAPS) { |
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973 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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974 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 975 } |
| 976 | |
| 977 | |
| 978 // Creates the initial ThreadGroup | |
| 979 static Handle create_initial_thread_group(TRAPS) { | |
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980 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 981 instanceKlassHandle klass (THREAD, k); |
| 982 | |
| 983 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 984 { | |
| 985 JavaValue result(T_VOID); | |
| 986 JavaCalls::call_special(&result, | |
| 987 system_instance, | |
| 988 klass, | |
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989 vmSymbols::object_initializer_name(), |
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990 vmSymbols::void_method_signature(), |
| 0 | 991 CHECK_NH); |
| 992 } | |
| 993 Universe::set_system_thread_group(system_instance()); | |
| 994 | |
| 995 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 996 { | |
| 997 JavaValue result(T_VOID); | |
| 998 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 999 JavaCalls::call_special(&result, | |
| 1000 main_instance, | |
| 1001 klass, | |
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1002 vmSymbols::object_initializer_name(), |
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1003 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1004 system_instance, |
| 1005 string, | |
| 1006 CHECK_NH); | |
| 1007 } | |
| 1008 return main_instance; | |
| 1009 } | |
| 1010 | |
| 1011 // Creates the initial Thread | |
| 1012 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1013 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1014 instanceKlassHandle klass (THREAD, k); |
| 1015 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1016 | |
| 1017 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1018 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1019 thread->set_threadObj(thread_oop()); | |
| 1020 | |
| 1021 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1022 | |
| 1023 JavaValue result(T_VOID); | |
| 1024 JavaCalls::call_special(&result, thread_oop, | |
| 1025 klass, | |
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1026 vmSymbols::object_initializer_name(), |
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1027 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1028 thread_group, |
| 1029 string, | |
| 1030 CHECK_NULL); | |
| 1031 return thread_oop(); | |
| 1032 } | |
| 1033 | |
| 1034 static void call_initializeSystemClass(TRAPS) { | |
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1035 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1036 instanceKlassHandle klass (THREAD, k); |
| 1037 | |
| 1038 JavaValue result(T_VOID); | |
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1039 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1040 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1041 } |
| 1042 | |
| 6181 | 1043 char java_runtime_name[128] = ""; |
| 1044 | |
| 1045 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1046 static const char* get_java_runtime_name(TRAPS) { | |
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1047 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1048 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1049 fieldDescriptor fd; | |
| 1050 bool found = k != NULL && | |
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1051 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1052 vmSymbols::string_signature(), &fd); |
| 1053 if (found) { | |
| 1054 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1055 if (name_oop == NULL) | |
| 1056 return NULL; | |
| 1057 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1058 java_runtime_name, | |
| 1059 sizeof(java_runtime_name)); | |
| 1060 return name; | |
| 1061 } else { | |
| 1062 return NULL; | |
| 1063 } | |
| 1064 } | |
| 1065 | |
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1066 // General purpose hook into Java code, run once when the VM is initialized. |
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1067 // The Java library method itself may be changed independently from the VM. |
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1068 static void call_postVMInitHook(TRAPS) { |
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1069 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1070 instanceKlassHandle klass (THREAD, k); |
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1071 if (klass.not_null()) { |
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1072 JavaValue result(T_VOID); |
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1073 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1074 vmSymbols::void_method_signature(), |
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1075 CHECK); |
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1076 } |
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1077 } |
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1078 |
| 0 | 1079 static void reset_vm_info_property(TRAPS) { |
| 1080 // the vm info string | |
| 1081 ResourceMark rm(THREAD); | |
| 1082 const char *vm_info = VM_Version::vm_info_string(); | |
| 1083 | |
| 1084 // java.lang.System class | |
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1085 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1086 instanceKlassHandle klass (THREAD, k); |
| 1087 | |
| 1088 // setProperty arguments | |
| 1089 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1090 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1091 | |
| 1092 // return value | |
| 1093 JavaValue r(T_OBJECT); | |
| 1094 | |
| 1095 // public static String setProperty(String key, String value); | |
| 1096 JavaCalls::call_static(&r, | |
| 1097 klass, | |
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1098 vmSymbols::setProperty_name(), |
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1099 vmSymbols::string_string_string_signature(), |
| 0 | 1100 key_str, |
| 1101 value_str, | |
| 1102 CHECK); | |
| 1103 } | |
| 1104 | |
| 1105 | |
| 1106 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1107 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1108 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1109 | |
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1110 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1111 instanceKlassHandle klass (THREAD, k); |
| 1112 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1113 | |
| 1114 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1115 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1116 set_threadObj(thread_oop()); | |
| 1117 | |
| 1118 JavaValue result(T_VOID); | |
| 1119 if (thread_name != NULL) { | |
| 1120 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1121 // Thread gets assigned specified name and null target | |
| 1122 JavaCalls::call_special(&result, | |
| 1123 thread_oop, | |
| 1124 klass, | |
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1125 vmSymbols::object_initializer_name(), |
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1126 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1127 thread_group, // Argument 1 |
| 1128 name, // Argument 2 | |
| 1129 THREAD); | |
| 1130 } else { | |
| 1131 // Thread gets assigned name "Thread-nnn" and null target | |
| 1132 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1133 JavaCalls::call_special(&result, | |
| 1134 thread_oop, | |
| 1135 klass, | |
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1136 vmSymbols::object_initializer_name(), |
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1137 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1138 thread_group, // Argument 1 |
| 1139 Handle(), // Argument 2 | |
| 1140 THREAD); | |
| 1141 } | |
| 1142 | |
| 1143 | |
| 1144 if (daemon) { | |
| 1145 java_lang_Thread::set_daemon(thread_oop()); | |
| 1146 } | |
| 1147 | |
| 1148 if (HAS_PENDING_EXCEPTION) { | |
| 1149 return; | |
| 1150 } | |
| 1151 | |
| 1142 | 1152 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1153 Handle threadObj(this, this->threadObj()); |
| 1154 | |
| 1155 JavaCalls::call_special(&result, | |
| 1156 thread_group, | |
| 1157 group, | |
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1158 vmSymbols::add_method_name(), |
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1159 vmSymbols::thread_void_signature(), |
| 0 | 1160 threadObj, // Arg 1 |
| 1161 THREAD); | |
| 1162 | |
| 1163 | |
| 1164 } | |
| 1165 | |
| 1166 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1167 // uniquely named instances should derive from this. | |
| 1168 NamedThread::NamedThread() : Thread() { | |
| 1169 _name = NULL; | |
|
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1170 _processed_thread = NULL; |
| 0 | 1171 } |
| 1172 | |
| 1173 NamedThread::~NamedThread() { | |
| 1174 if (_name != NULL) { | |
| 6197 | 1175 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1176 _name = NULL; |
| 1177 } | |
| 1178 } | |
| 1179 | |
| 1180 void NamedThread::set_name(const char* format, ...) { | |
| 1181 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1182 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1183 guarantee(_name != NULL, "alloc failure"); |
| 1184 va_list ap; | |
| 1185 va_start(ap, format); | |
| 1186 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1187 va_end(ap); | |
| 1188 } | |
| 1189 | |
| 1190 // ======= WatcherThread ======== | |
| 1191 | |
| 1192 // The watcher thread exists to simulate timer interrupts. It should | |
| 1193 // be replaced by an abstraction over whatever native support for | |
| 1194 // timer interrupts exists on the platform. | |
| 1195 | |
| 1196 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1197 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1198 |
| 1199 WatcherThread::WatcherThread() : Thread() { | |
| 1200 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1201 if (os::create_thread(this, os::watcher_thread)) { | |
| 1202 _watcher_thread = this; | |
| 1203 | |
| 1204 // Set the watcher thread to the highest OS priority which should not be | |
| 1205 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1206 // is created. The only normal thread using this priority is the reference | |
| 1207 // handler thread, which runs for very short intervals only. | |
| 1208 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1209 // will be inaccurate. | |
| 1210 os::set_priority(this, MaxPriority); | |
| 1211 if (!DisableStartThread) { | |
| 1212 os::start_thread(this); | |
| 1213 } | |
| 1214 } | |
| 1215 } | |
| 1216 | |
| 1217 void WatcherThread::run() { | |
| 1218 assert(this == watcher_thread(), "just checking"); | |
| 1219 | |
| 1220 this->record_stack_base_and_size(); | |
| 1221 this->initialize_thread_local_storage(); | |
| 1222 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1223 while(!_should_terminate) { | |
| 1224 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1225 assert(watcher_thread() == this, "thread consistency check"); | |
| 1226 | |
| 1227 // Calculate how long it'll be until the next PeriodicTask work | |
| 1228 // should be done, and sleep that amount of time. | |
|
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1229 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1230 |
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1231 // we expect this to timeout - we only ever get unparked when |
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1232 // we should terminate |
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1233 { |
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1234 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1235 |
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1236 jlong prev_time = os::javaTimeNanos(); |
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1237 for (;;) { |
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1238 int res= _SleepEvent->park(time_to_wait); |
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1239 if (res == OS_TIMEOUT || _should_terminate) |
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1240 break; |
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1241 // spurious wakeup of some kind |
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1242 jlong now = os::javaTimeNanos(); |
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1243 time_to_wait -= (now - prev_time) / 1000000; |
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1244 if (time_to_wait <= 0) |
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1245 break; |
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1246 prev_time = now; |
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1247 } |
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1248 } |
| 0 | 1249 |
| 1250 if (is_error_reported()) { | |
| 1251 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1252 // should abort JVM after creating an error log file. However in some | |
| 1253 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1254 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1255 // | |
| 1256 // This code is in WatcherThread because WatcherThread wakes up | |
| 1257 // periodically so the fatal error handler doesn't need to do anything; | |
| 1258 // also because the WatcherThread is less likely to crash than other | |
| 1259 // threads. | |
| 1260 | |
| 1261 for (;;) { | |
| 1262 if (!ShowMessageBoxOnError | |
| 1263 && (OnError == NULL || OnError[0] == '\0') | |
| 1264 && Arguments::abort_hook() == NULL) { | |
| 1265 os::sleep(this, 2 * 60 * 1000, false); | |
| 1266 fdStream err(defaultStream::output_fd()); | |
| 1267 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1268 // skip atexit/vm_exit/vm_abort hooks | |
| 1269 os::die(); | |
| 1270 } | |
| 1271 | |
| 1272 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1273 // ShowMessageBoxOnError when it is ready to abort. | |
| 1274 os::sleep(this, 5 * 1000, false); | |
| 1275 } | |
| 1276 } | |
| 1277 | |
| 1278 PeriodicTask::real_time_tick(time_to_wait); | |
| 1279 | |
| 1280 // If we have no more tasks left due to dynamic disenrollment, | |
| 1281 // shut down the thread since we don't currently support dynamic enrollment | |
| 1282 if (PeriodicTask::num_tasks() == 0) { | |
| 1283 _should_terminate = true; | |
| 1284 } | |
| 1285 } | |
| 1286 | |
| 1287 // Signal that it is terminated | |
| 1288 { | |
| 1289 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1290 _watcher_thread = NULL; | |
| 1291 Terminator_lock->notify(); | |
| 1292 } | |
| 1293 | |
| 1294 // Thread destructor usually does this.. | |
| 1295 ThreadLocalStorage::set_thread(NULL); | |
| 1296 } | |
| 1297 | |
| 1298 void WatcherThread::start() { | |
| 1299 if (watcher_thread() == NULL) { | |
| 1300 _should_terminate = false; | |
| 1301 // Create the single instance of WatcherThread | |
| 1302 new WatcherThread(); | |
| 1303 } | |
| 1304 } | |
| 1305 | |
| 1306 void WatcherThread::stop() { | |
| 1307 // it is ok to take late safepoints here, if needed | |
| 1308 MutexLocker mu(Terminator_lock); | |
| 1309 _should_terminate = true; | |
|
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1310 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1311 |
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1312 Thread* watcher = watcher_thread(); |
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1313 if (watcher != NULL) |
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1314 watcher->_SleepEvent->unpark(); |
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1315 |
| 0 | 1316 while(watcher_thread() != NULL) { |
| 1317 // This wait should make safepoint checks, wait without a timeout, | |
| 1318 // and wait as a suspend-equivalent condition. | |
| 1319 // | |
| 1320 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1321 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1322 // FlatProfiler task, is waiting for the external suspend request on | |
| 1323 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1324 // eventually timeout, but that takes time. Making this wait a | |
| 1325 // suspend-equivalent condition solves that timeout problem. | |
| 1326 // | |
| 1327 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1328 Mutex::_as_suspend_equivalent_flag); | |
| 1329 } | |
| 1330 } | |
| 1331 | |
| 1332 void WatcherThread::print_on(outputStream* st) const { | |
| 1333 st->print("\"%s\" ", name()); | |
| 1334 Thread::print_on(st); | |
| 1335 st->cr(); | |
| 1336 } | |
| 1337 | |
| 1338 // ======= JavaThread ======== | |
| 1339 | |
| 1340 // A JavaThread is a normal Java thread | |
| 1341 | |
| 1342 void JavaThread::initialize() { | |
| 1343 // Initialize fields | |
|
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1344 |
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1345 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1346 set_claimed_par_id(-1); |
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1347 |
| 0 | 1348 set_saved_exception_pc(NULL); |
| 1349 set_threadObj(NULL); | |
| 1350 _anchor.clear(); | |
| 1351 set_entry_point(NULL); | |
| 1352 set_jni_functions(jni_functions()); | |
| 1353 set_callee_target(NULL); | |
| 1354 set_vm_result(NULL); | |
| 1355 set_vm_result_2(NULL); | |
| 1356 set_vframe_array_head(NULL); | |
| 1357 set_vframe_array_last(NULL); | |
| 1358 set_deferred_locals(NULL); | |
| 1359 set_deopt_mark(NULL); | |
|
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1360 set_deopt_nmethod(NULL); |
| 0 | 1361 clear_must_deopt_id(); |
| 1362 set_monitor_chunks(NULL); | |
| 1363 set_next(NULL); | |
| 1364 set_thread_state(_thread_new); | |
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1365 #if INCLUDE_NMT |
| 6197 | 1366 set_recorder(NULL); |
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1367 #endif |
| 0 | 1368 _terminated = _not_terminated; |
| 1369 _privileged_stack_top = NULL; | |
| 1370 _array_for_gc = NULL; | |
| 1371 _suspend_equivalent = false; | |
| 1372 _in_deopt_handler = 0; | |
| 1373 _doing_unsafe_access = false; | |
| 1374 _stack_guard_state = stack_guard_unused; | |
| 1375 _exception_oop = NULL; | |
| 1376 _exception_pc = 0; | |
| 1377 _exception_handler_pc = 0; | |
| 1903 | 1378 _is_method_handle_return = 0; |
| 0 | 1379 _jvmti_thread_state= NULL; |
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1380 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1381 _jvmti_get_loaded_classes_closure = NULL; |
| 1382 _interp_only_mode = 0; | |
| 1383 _special_runtime_exit_condition = _no_async_condition; | |
| 1384 _pending_async_exception = NULL; | |
| 1385 _is_compiling = false; | |
| 1386 _thread_stat = NULL; | |
| 1387 _thread_stat = new ThreadStatistics(); | |
| 1388 _blocked_on_compilation = false; | |
| 1389 _jni_active_critical = 0; | |
| 1390 _do_not_unlock_if_synchronized = false; | |
| 1391 _cached_monitor_info = NULL; | |
| 1392 _parker = Parker::Allocate(this) ; | |
| 1393 | |
| 1394 #ifndef PRODUCT | |
| 1395 _jmp_ring_index = 0; | |
| 1396 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1397 record_jump(NULL, NULL, NULL, 0); | |
| 1398 } | |
| 1399 #endif /* PRODUCT */ | |
| 1400 | |
| 1401 set_thread_profiler(NULL); | |
| 1402 if (FlatProfiler::is_active()) { | |
| 1403 // This is where we would decide to either give each thread it's own profiler | |
| 1404 // or use one global one from FlatProfiler, | |
| 1405 // or up to some count of the number of profiled threads, etc. | |
| 1406 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1407 pp->engage(); | |
| 1408 set_thread_profiler(pp); | |
| 1409 } | |
| 1410 | |
| 1411 // Setup safepoint state info for this thread | |
| 1412 ThreadSafepointState::create(this); | |
| 1413 | |
| 1414 debug_only(_java_call_counter = 0); | |
| 1415 | |
| 1416 // JVMTI PopFrame support | |
| 1417 _popframe_condition = popframe_inactive; | |
| 1418 _popframe_preserved_args = NULL; | |
| 1419 _popframe_preserved_args_size = 0; | |
| 1420 | |
| 1421 pd_initialize(); | |
| 1422 } | |
| 1423 | |
|
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1424 #ifndef SERIALGC |
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1425 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1426 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1427 #endif // !SERIALGC |
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1428 |
| 4006 | 1429 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1430 Thread() |
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1431 #ifndef SERIALGC |
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1432 , _satb_mark_queue(&_satb_mark_queue_set), |
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1433 _dirty_card_queue(&_dirty_card_queue_set) |
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1434 #endif // !SERIALGC |
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1435 { |
| 0 | 1436 initialize(); |
| 4006 | 1437 if (is_attaching_via_jni) { |
| 1438 _jni_attach_state = _attaching_via_jni; | |
| 1439 } else { | |
| 1440 _jni_attach_state = _not_attaching_via_jni; | |
| 1441 } | |
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1442 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 6197 | 1443 _safepoint_visible = false; |
| 0 | 1444 } |
| 1445 | |
| 1446 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1447 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1448 return true; // Stack already guarded or guard pages not needed. | |
| 1449 } | |
| 1450 | |
| 1451 if (register_stack_overflow()) { | |
| 1452 // For those architectures which have separate register and | |
| 1453 // memory stacks, we must check the register stack to see if | |
| 1454 // it has overflowed. | |
| 1455 return false; | |
| 1456 } | |
| 1457 | |
| 1458 // Java code never executes within the yellow zone: the latter is only | |
| 1459 // there to provoke an exception during stack banging. If java code | |
| 1460 // is executing there, either StackShadowPages should be larger, or | |
| 1461 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1462 // when it should. | |
| 1463 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1464 | |
| 1465 enable_stack_yellow_zone(); | |
| 1466 return true; | |
| 1467 } | |
| 1468 | |
| 1469 bool JavaThread::reguard_stack(void) { | |
| 1470 return reguard_stack(os::current_stack_pointer()); | |
| 1471 } | |
| 1472 | |
| 1473 | |
| 1474 void JavaThread::block_if_vm_exited() { | |
| 1475 if (_terminated == _vm_exited) { | |
| 1476 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1477 // we will block here forever | |
| 1478 Threads_lock->lock_without_safepoint_check(); | |
| 1479 ShouldNotReachHere(); | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 1483 | |
| 1484 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1485 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1486 | |
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1487 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1488 Thread() |
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1489 #ifndef SERIALGC |
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1490 , _satb_mark_queue(&_satb_mark_queue_set), |
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1491 _dirty_card_queue(&_dirty_card_queue_set) |
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1492 #endif // !SERIALGC |
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1493 { |
| 0 | 1494 if (TraceThreadEvents) { |
| 1495 tty->print_cr("creating thread %p", this); | |
| 1496 } | |
| 1497 initialize(); | |
| 4006 | 1498 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1499 set_entry_point(entry_point); |
| 1500 // Create the native thread itself. | |
| 1501 // %note runtime_23 | |
| 1502 os::ThreadType thr_type = os::java_thread; | |
| 1503 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1504 os::java_thread; | |
| 1505 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1506 _safepoint_visible = false; |
| 0 | 1507 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1508 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1509 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1510 // the exception consists of creating the exception object & initializing it, initialization | |
| 1511 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1512 // | |
| 1513 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1514 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1515 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1516 // object must be fully initialized (take a look at JVM_Start) | |
| 1517 } | |
| 1518 | |
| 1519 JavaThread::~JavaThread() { | |
| 1520 if (TraceThreadEvents) { | |
| 1521 tty->print_cr("terminate thread %p", this); | |
| 1522 } | |
| 1523 | |
| 6197 | 1524 // Info NMT that this JavaThread is exiting, its memory |
| 1525 // recorder should be collected | |
| 1526 assert(!is_safepoint_visible(), "wrong state"); | |
| 1527 MemTracker::thread_exiting(this); | |
| 1528 | |
| 0 | 1529 // JSR166 -- return the parker to the free list |
| 1530 Parker::Release(_parker); | |
| 1531 _parker = NULL ; | |
| 1532 | |
| 1533 // Free any remaining previous UnrollBlock | |
| 1534 vframeArray* old_array = vframe_array_last(); | |
| 1535 | |
| 1536 if (old_array != NULL) { | |
| 1537 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1538 old_array->set_unroll_block(NULL); | |
| 1539 delete old_info; | |
| 1540 delete old_array; | |
| 1541 } | |
| 1542 | |
| 1543 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1544 if (deferred != NULL) { | |
| 1545 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1546 assert(deferred->length() != 0, "empty array!"); | |
| 1547 do { | |
| 1548 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1549 deferred->remove_at(0); | |
| 1550 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1551 delete dlv; | |
| 1552 } while (deferred->length() != 0); | |
| 1553 delete deferred; | |
| 1554 } | |
| 1555 | |
| 1556 // All Java related clean up happens in exit | |
| 1557 ThreadSafepointState::destroy(this); | |
| 1558 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1559 if (_thread_stat != NULL) delete _thread_stat; | |
| 1560 } | |
| 1561 | |
| 1562 | |
| 1563 // The first routine called by a new Java thread | |
| 1564 void JavaThread::run() { | |
| 1565 // initialize thread-local alloc buffer related fields | |
| 1566 this->initialize_tlab(); | |
| 1567 | |
| 1568 // used to test validitity of stack trace backs | |
| 1569 this->record_base_of_stack_pointer(); | |
| 1570 | |
| 1571 // Record real stack base and size. | |
| 1572 this->record_stack_base_and_size(); | |
| 1573 | |
| 1574 // Initialize thread local storage; set before calling MutexLocker | |
| 1575 this->initialize_thread_local_storage(); | |
| 1576 | |
| 1577 this->create_stack_guard_pages(); | |
| 1578 | |
|
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1579 this->cache_global_variables(); |
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1580 |
| 0 | 1581 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1582 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1583 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1584 | |
| 1585 assert(JavaThread::current() == this, "sanity check"); | |
| 1586 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1587 | |
| 1588 DTRACE_THREAD_PROBE(start, this); | |
| 1589 | |
| 1590 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1591 // been completed. | |
| 1592 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1593 | |
| 1594 if (JvmtiExport::should_post_thread_life()) { | |
| 1595 JvmtiExport::post_thread_start(this); | |
| 1596 } | |
| 1597 | |
|
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1598 EVENT_BEGIN(TraceEventThreadStart, event); |
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1599 EVENT_COMMIT(event, |
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1600 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1601 |
| 0 | 1602 // We call another function to do the rest so we are sure that the stack addresses used |
| 1603 // from there will be lower than the stack base just computed | |
| 1604 thread_main_inner(); | |
| 1605 | |
| 1606 // Note, thread is no longer valid at this point! | |
| 1607 } | |
| 1608 | |
| 1609 | |
| 1610 void JavaThread::thread_main_inner() { | |
| 1611 assert(JavaThread::current() == this, "sanity check"); | |
| 1612 assert(this->threadObj() != NULL, "just checking"); | |
| 1613 | |
|
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1614 // Execute thread entry point unless this thread has a pending exception |
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1615 // or has been stopped before starting. |
| 0 | 1616 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1617 if (!this->has_pending_exception() && |
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1618 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1619 { |
| 1620 ResourceMark rm(this); | |
| 1621 this->set_native_thread_name(this->get_thread_name()); | |
| 1622 } | |
| 0 | 1623 HandleMark hm(this); |
| 1624 this->entry_point()(this, this); | |
| 1625 } | |
| 1626 | |
| 1627 DTRACE_THREAD_PROBE(stop, this); | |
| 1628 | |
| 1629 this->exit(false); | |
| 1630 delete this; | |
| 1631 } | |
| 1632 | |
| 1633 | |
| 1634 static void ensure_join(JavaThread* thread) { | |
| 1635 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1636 Handle threadObj(thread, thread->threadObj()); | |
| 1637 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1638 ObjectLocker lock(threadObj, thread); | |
| 1639 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1640 thread->clear_pending_exception(); | |
| 1641 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1642 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1643 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1644 // to complete once we've done the notify_all below |
| 0 | 1645 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1646 lock.notify_all(thread); | |
| 1647 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1648 thread->clear_pending_exception(); | |
| 1649 } | |
| 1650 | |
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1651 |
| 0 | 1652 // For any new cleanup additions, please check to see if they need to be applied to |
| 1653 // cleanup_failed_attach_current_thread as well. | |
| 1654 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1655 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1656 if (!InitializeJavaLangSystem) return; | |
| 1657 | |
| 1658 HandleMark hm(this); | |
| 1659 Handle uncaught_exception(this, this->pending_exception()); | |
| 1660 this->clear_pending_exception(); | |
| 1661 Handle threadObj(this, this->threadObj()); | |
| 1662 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1663 | |
| 1664 if (get_thread_profiler() != NULL) { | |
| 1665 get_thread_profiler()->disengage(); | |
| 1666 ResourceMark rm; | |
| 1667 get_thread_profiler()->print(get_thread_name()); | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1672 { | |
| 1673 EXCEPTION_MARK; | |
| 1674 | |
| 1675 CLEAR_PENDING_EXCEPTION; | |
| 1676 } | |
| 1677 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1678 // has to be fixed by a runtime query method | |
| 1679 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1680 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1681 // java.lang.Thread.dispatchUncaughtException | |
| 1682 if (uncaught_exception.not_null()) { | |
| 1683 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1684 { | |
| 1685 EXCEPTION_MARK; | |
| 1686 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1687 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1688 // so call ThreadGroup.uncaughtException() | |
| 1689 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1690 CallInfo callinfo; | |
| 1142 | 1691 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1692 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1693 vmSymbols::dispatchUncaughtException_name(), |
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1694 vmSymbols::throwable_void_signature(), |
| 0 | 1695 KlassHandle(), false, false, THREAD); |
| 1696 CLEAR_PENDING_EXCEPTION; | |
| 1697 methodHandle method = callinfo.selected_method(); | |
| 1698 if (method.not_null()) { | |
| 1699 JavaValue result(T_VOID); | |
| 1700 JavaCalls::call_virtual(&result, | |
| 1701 threadObj, thread_klass, | |
|
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1702 vmSymbols::dispatchUncaughtException_name(), |
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1703 vmSymbols::throwable_void_signature(), |
| 0 | 1704 uncaught_exception, |
| 1705 THREAD); | |
| 1706 } else { | |
| 1142 | 1707 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1708 JavaValue result(T_VOID); |
| 1709 JavaCalls::call_virtual(&result, | |
| 1710 group, thread_group, | |
|
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1711 vmSymbols::uncaughtException_name(), |
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1712 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1713 threadObj, // Arg 1 |
| 1714 uncaught_exception, // Arg 2 | |
| 1715 THREAD); | |
| 1716 } | |
|
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1717 if (HAS_PENDING_EXCEPTION) { |
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1718 ResourceMark rm(this); |
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1719 jio_fprintf(defaultStream::error_stream(), |
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1720 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1721 " in thread \"%s\"\n", |
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1722 Klass::cast(pending_exception()->klass())->external_name(), |
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1723 get_thread_name()); |
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1724 CLEAR_PENDING_EXCEPTION; |
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1725 } |
| 0 | 1726 } |
| 1727 } | |
| 1728 | |
|
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1729 // Called before the java thread exit since we want to read info |
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1730 // from java_lang_Thread object |
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1731 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1732 EVENT_COMMIT(event, |
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1733 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1734 |
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1735 // Call after last event on thread |
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1736 EVENT_THREAD_EXIT(this); |
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1737 |
| 0 | 1738 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1739 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1740 // is deprecated anyhow. | |
| 1741 { int count = 3; | |
| 1742 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1743 EXCEPTION_MARK; | |
| 1744 JavaValue result(T_VOID); | |
| 1142 | 1745 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1746 JavaCalls::call_virtual(&result, |
| 1747 threadObj, thread_klass, | |
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1748 vmSymbols::exit_method_name(), |
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1749 vmSymbols::void_method_signature(), |
| 0 | 1750 THREAD); |
| 1751 CLEAR_PENDING_EXCEPTION; | |
| 1752 } | |
| 1753 } | |
| 1754 | |
| 1755 // notify JVMTI | |
| 1756 if (JvmtiExport::should_post_thread_life()) { | |
| 1757 JvmtiExport::post_thread_end(this); | |
| 1758 } | |
| 1759 | |
| 1760 // We have notified the agents that we are exiting, before we go on, | |
| 1761 // we must check for a pending external suspend request and honor it | |
| 1762 // in order to not surprise the thread that made the suspend request. | |
| 1763 while (true) { | |
| 1764 { | |
| 1765 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1766 if (!is_external_suspend()) { | |
| 1767 set_terminated(_thread_exiting); | |
| 1768 ThreadService::current_thread_exiting(this); | |
| 1769 break; | |
| 1770 } | |
| 1771 // Implied else: | |
| 1772 // Things get a little tricky here. We have a pending external | |
| 1773 // suspend request, but we are holding the SR_lock so we | |
| 1774 // can't just self-suspend. So we temporarily drop the lock | |
| 1775 // and then self-suspend. | |
| 1776 } | |
| 1777 | |
| 1778 ThreadBlockInVM tbivm(this); | |
| 1779 java_suspend_self(); | |
| 1780 | |
| 1781 // We're done with this suspend request, but we have to loop around | |
| 1782 // and check again. Eventually we will get SR_lock without a pending | |
| 1783 // external suspend request and will be able to mark ourselves as | |
| 1784 // exiting. | |
| 1785 } | |
| 1786 // no more external suspends are allowed at this point | |
| 1787 } else { | |
| 1788 // before_exit() has already posted JVMTI THREAD_END events | |
| 1789 } | |
| 1790 | |
| 1791 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1792 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1793 // group should have the destroyed bit set before waiters are notified). | |
| 1794 ensure_join(this); | |
| 1795 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1796 | |
| 1797 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1798 // held by this thread must be released. A detach operation must only | |
| 1799 // get here if there are no Java frames on the stack. Therefore, any | |
| 1800 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1801 // pre-inflated and in the monitor cache. | |
| 1802 // | |
| 1803 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1804 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1805 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1806 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1807 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1808 } | |
| 1809 | |
| 1810 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1811 // is in a consistent state, in case GC happens | |
| 1812 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1813 | |
| 1814 if (active_handles() != NULL) { | |
| 1815 JNIHandleBlock* block = active_handles(); | |
| 1816 set_active_handles(NULL); | |
| 1817 JNIHandleBlock::release_block(block); | |
| 1818 } | |
| 1819 | |
| 1820 if (free_handle_block() != NULL) { | |
| 1821 JNIHandleBlock* block = free_handle_block(); | |
| 1822 set_free_handle_block(NULL); | |
| 1823 JNIHandleBlock::release_block(block); | |
| 1824 } | |
| 1825 | |
| 1826 // These have to be removed while this is still a valid thread. | |
| 1827 remove_stack_guard_pages(); | |
| 1828 | |
| 1829 if (UseTLAB) { | |
| 1830 tlab().make_parsable(true); // retire TLAB | |
| 1831 } | |
| 1832 | |
|
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1833 if (JvmtiEnv::environments_might_exist()) { |
|
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1834 JvmtiExport::cleanup_thread(this); |
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1835 } |
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1836 |
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1837 #ifndef SERIALGC |
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1838 // We must flush G1-related buffers before removing a thread from |
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1839 // the list of active threads. |
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1840 if (UseG1GC) { |
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1841 flush_barrier_queues(); |
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1842 } |
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1843 #endif |
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1844 |
| 0 | 1845 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1846 Threads::remove(this); | |
| 1847 } | |
| 1848 | |
|
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1849 #ifndef SERIALGC |
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1850 // Flush G1-related queues. |
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1851 void JavaThread::flush_barrier_queues() { |
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1852 satb_mark_queue().flush(); |
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1853 dirty_card_queue().flush(); |
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1854 } |
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1855 |
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1856 void JavaThread::initialize_queues() { |
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1857 assert(!SafepointSynchronize::is_at_safepoint(), |
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1858 "we should not be at a safepoint"); |
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1859 |
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1860 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1861 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1862 // The SATB queue should have been constructed with its active |
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1863 // field set to false. |
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1864 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1865 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1866 // If we are creating the thread during a marking cycle, we should |
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1867 // set the active field of the SATB queue to true. |
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1868 if (satb_queue_set.is_active()) { |
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1869 satb_queue.set_active(true); |
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1870 } |
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1871 |
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1872 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1873 // The dirty card queue should have been constructed with its |
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1874 // active field set to true. |
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1875 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1876 } |
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1877 #endif // !SERIALGC |
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1878 |
| 0 | 1879 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1880 if (get_thread_profiler() != NULL) { |
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1881 get_thread_profiler()->disengage(); |
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1882 ResourceMark rm; |
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1883 get_thread_profiler()->print(get_thread_name()); |
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1884 } |
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1885 |
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1886 if (active_handles() != NULL) { |
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1887 JNIHandleBlock* block = active_handles(); |
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1888 set_active_handles(NULL); |
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1889 JNIHandleBlock::release_block(block); |
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1890 } |
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1891 |
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1892 if (free_handle_block() != NULL) { |
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1893 JNIHandleBlock* block = free_handle_block(); |
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1894 set_free_handle_block(NULL); |
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1895 JNIHandleBlock::release_block(block); |
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1896 } |
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1897 |
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1898 // These have to be removed while this is still a valid thread. |
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1899 remove_stack_guard_pages(); |
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1900 |
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1901 if (UseTLAB) { |
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1902 tlab().make_parsable(true); // retire TLAB, if any |
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1903 } |
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1904 |
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1905 #ifndef SERIALGC |
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1906 if (UseG1GC) { |
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1907 flush_barrier_queues(); |
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1908 } |
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1909 #endif |
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1910 |
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1911 Threads::remove(this); |
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1912 delete this; |
| 0 | 1913 } |
| 1914 | |
| 1915 | |
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1916 |
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1917 |
| 0 | 1918 JavaThread* JavaThread::active() { |
| 1919 Thread* thread = ThreadLocalStorage::thread(); | |
| 1920 assert(thread != NULL, "just checking"); | |
| 1921 if (thread->is_Java_thread()) { | |
| 1922 return (JavaThread*) thread; | |
| 1923 } else { | |
| 1924 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1925 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1926 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1927 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1928 return ret; | |
| 1929 } | |
| 1930 } | |
| 1931 | |
| 1932 bool JavaThread::is_lock_owned(address adr) const { | |
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1933 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1934 |
| 1935 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1936 if (chunk->contains(adr)) return true; | |
| 1937 } | |
| 1938 | |
| 1939 return false; | |
| 1940 } | |
| 1941 | |
| 1942 | |
| 1943 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1944 chunk->set_next(monitor_chunks()); | |
| 1945 set_monitor_chunks(chunk); | |
| 1946 } | |
| 1947 | |
| 1948 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1949 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1950 if (monitor_chunks() == chunk) { | |
| 1951 set_monitor_chunks(chunk->next()); | |
| 1952 } else { | |
| 1953 MonitorChunk* prev = monitor_chunks(); | |
| 1954 while (prev->next() != chunk) prev = prev->next(); | |
| 1955 prev->set_next(chunk->next()); | |
| 1956 } | |
| 1957 } | |
| 1958 | |
| 1959 // JVM support. | |
| 1960 | |
| 1961 // Note: this function shouldn't block if it's called in | |
| 1962 // _thread_in_native_trans state (such as from | |
| 1963 // check_special_condition_for_native_trans()). | |
| 1964 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1965 | |
| 1966 if (has_last_Java_frame() && has_async_condition()) { | |
| 1967 // If we are at a polling page safepoint (not a poll return) | |
| 1968 // then we must defer async exception because live registers | |
| 1969 // will be clobbered by the exception path. Poll return is | |
| 1970 // ok because the call we a returning from already collides | |
| 1971 // with exception handling registers and so there is no issue. | |
| 1972 // (The exception handling path kills call result registers but | |
| 1973 // this is ok since the exception kills the result anyway). | |
| 1974 | |
| 1975 if (is_at_poll_safepoint()) { | |
| 1976 // if the code we are returning to has deoptimized we must defer | |
| 1977 // the exception otherwise live registers get clobbered on the | |
| 1978 // exception path before deoptimization is able to retrieve them. | |
| 1979 // | |
| 1980 RegisterMap map(this, false); | |
| 1981 frame caller_fr = last_frame().sender(&map); | |
| 1982 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1983 if (caller_fr.is_deoptimized_frame()) { | |
| 1984 if (TraceExceptions) { | |
| 1985 ResourceMark rm; | |
| 1986 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1987 } | |
| 1988 return; | |
| 1989 } | |
| 1990 } | |
| 1991 } | |
| 1992 | |
| 1993 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1994 if (condition == _no_async_condition) { | |
| 1995 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1996 // was called: | |
| 1997 // - if we were here only because of an external suspend request, | |
| 1998 // then that was taken care of above (or cancelled) so we are done | |
| 1999 // - if we were here because of another async request, then it has | |
| 2000 // been cleared between the has_special_runtime_exit_condition() | |
| 2001 // and now so again we are done | |
| 2002 return; | |
| 2003 } | |
| 2004 | |
| 2005 // Check for pending async. exception | |
| 2006 if (_pending_async_exception != NULL) { | |
| 2007 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2008 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2009 |
| 2010 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2011 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2012 | |
| 2013 if (TraceExceptions) { | |
| 2014 ResourceMark rm; | |
| 2015 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2016 if (has_last_Java_frame() ) { | |
| 2017 frame f = last_frame(); | |
| 2018 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2019 } | |
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2020 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2021 } |
| 2022 _pending_async_exception = NULL; | |
| 2023 clear_has_async_exception(); | |
| 2024 } | |
| 2025 } | |
| 2026 | |
| 2027 if (check_unsafe_error && | |
| 2028 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2029 condition = _no_async_condition; // done | |
| 2030 switch (thread_state()) { | |
| 2031 case _thread_in_vm: | |
| 2032 { | |
| 2033 JavaThread* THREAD = this; | |
| 2034 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2035 } | |
| 2036 case _thread_in_native: | |
| 2037 { | |
| 2038 ThreadInVMfromNative tiv(this); | |
| 2039 JavaThread* THREAD = this; | |
| 2040 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2041 } | |
| 2042 case _thread_in_Java: | |
| 2043 { | |
| 2044 ThreadInVMfromJava tiv(this); | |
| 2045 JavaThread* THREAD = this; | |
| 2046 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2047 } | |
| 2048 default: | |
| 2049 ShouldNotReachHere(); | |
| 2050 } | |
| 2051 } | |
| 2052 | |
| 2053 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2054 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2055 "must have handled the async condition, if no exception"); | |
| 2056 } | |
| 2057 | |
| 2058 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2059 // | |
| 2060 // Check for pending external suspend. Internal suspend requests do | |
| 2061 // not use handle_special_runtime_exit_condition(). | |
| 2062 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2063 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2064 // threads could call into the VM with another thread's JNIEnv so we | |
| 2065 // can be here operating on behalf of a suspended thread (4432884). | |
| 2066 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2067 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2068 // | |
| 2069 // Because thread is external suspended the safepoint code will count | |
| 2070 // thread as at a safepoint. This can be odd because we can be here | |
| 2071 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2072 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2073 // before calling java_suspend_self like all other callers of it but | |
| 2074 // we must then observe proper safepoint protocol. (We can't leave | |
| 2075 // _thread_blocked with a safepoint in progress). However we can be | |
| 2076 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2077 // constructor/destructor pair because they assert on that type of | |
| 2078 // transition. We could do something like: | |
| 2079 // | |
| 2080 // JavaThreadState state = thread_state(); | |
| 2081 // set_thread_state(_thread_in_vm); | |
| 2082 // { | |
| 2083 // ThreadBlockInVM tbivm(this); | |
| 2084 // java_suspend_self() | |
| 2085 // } | |
| 2086 // set_thread_state(_thread_in_vm_trans); | |
| 2087 // if (safepoint) block; | |
| 2088 // set_thread_state(state); | |
| 2089 // | |
| 2090 // but that is pretty messy. Instead we just go with the way the | |
| 2091 // code has worked before and note that this is the only path to | |
| 2092 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2093 // mode. | |
| 2094 | |
| 2095 frame_anchor()->make_walkable(this); | |
| 2096 java_suspend_self(); | |
| 2097 | |
| 2098 // We might be here for reasons in addition to the self-suspend request | |
| 2099 // so check for other async requests. | |
| 2100 } | |
| 2101 | |
| 2102 if (check_asyncs) { | |
| 2103 check_and_handle_async_exceptions(); | |
| 2104 } | |
| 2105 } | |
| 2106 | |
| 2107 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2108 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2109 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2110 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2111 | |
| 2112 // Do not throw asynchronous exceptions against the compiler thread | |
| 2113 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2114 if (is_Compiler_thread()) return; | |
| 2115 | |
| 2116 { | |
| 2117 // Actually throw the Throwable against the target Thread - however | |
| 2118 // only if there is no thread death exception installed already. | |
| 1142 | 2119 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2120 // If the topmost frame is a runtime stub, then we are calling into |
| 2121 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2122 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2123 // may not be valid | |
| 2124 if (has_last_Java_frame()) { | |
| 2125 frame f = last_frame(); | |
| 2126 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2127 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2128 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2129 frame compiled_frame = f.sender(®_map); | |
| 2130 if (compiled_frame.can_be_deoptimized()) { | |
| 2131 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2132 } | |
| 2133 } | |
| 2134 } | |
| 2135 | |
| 2136 // Set async. pending exception in thread. | |
| 2137 set_pending_async_exception(java_throwable); | |
| 2138 | |
| 2139 if (TraceExceptions) { | |
| 2140 ResourceMark rm; | |
|
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2141 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2142 } |
| 2143 // for AbortVMOnException flag | |
|
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2144 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2145 } |
| 2146 } | |
| 2147 | |
| 2148 | |
| 2149 // Interrupt thread so it will wake up from a potential wait() | |
| 2150 Thread::interrupt(this); | |
| 2151 } | |
| 2152 | |
| 2153 // External suspension mechanism. | |
| 2154 // | |
| 2155 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2156 // to any VM_locks and it is at a transition | |
| 2157 // Self-suspension will happen on the transition out of the vm. | |
| 2158 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2159 // | |
| 2160 // Guarantees on return: | |
| 2161 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2162 // force a safepoint) | |
| 2163 // + Target thread will not enter any new monitors | |
| 2164 // | |
| 2165 void JavaThread::java_suspend() { | |
| 2166 { MutexLocker mu(Threads_lock); | |
| 2167 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2168 return; | |
| 2169 } | |
| 2170 } | |
| 2171 | |
| 2172 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2173 if (!is_external_suspend()) { | |
| 2174 // a racing resume has cancelled us; bail out now | |
| 2175 return; | |
| 2176 } | |
| 2177 | |
| 2178 // suspend is done | |
| 2179 uint32_t debug_bits = 0; | |
| 2180 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2181 // SR_lock to allow the thread to reach a stable thread state if | |
| 2182 // it is currently in a transient thread state. | |
| 2183 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2184 SuspendRetryDelay, &debug_bits) ) { | |
| 2185 return; | |
| 2186 } | |
| 2187 } | |
| 2188 | |
| 2189 VM_ForceSafepoint vm_suspend; | |
| 2190 VMThread::execute(&vm_suspend); | |
| 2191 } | |
| 2192 | |
| 2193 // Part II of external suspension. | |
| 2194 // A JavaThread self suspends when it detects a pending external suspend | |
| 2195 // request. This is usually on transitions. It is also done in places | |
| 2196 // where continuing to the next transition would surprise the caller, | |
| 2197 // e.g., monitor entry. | |
| 2198 // | |
| 2199 // Returns the number of times that the thread self-suspended. | |
| 2200 // | |
| 2201 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2202 // thread. java_suspend_self() is the second stage of cooperative | |
| 2203 // suspension for external suspend requests and should only be used | |
| 2204 // to complete an external suspend request. | |
| 2205 // | |
| 2206 int JavaThread::java_suspend_self() { | |
| 2207 int ret = 0; | |
| 2208 | |
| 2209 // we are in the process of exiting so don't suspend | |
| 2210 if (is_exiting()) { | |
| 2211 clear_external_suspend(); | |
| 2212 return ret; | |
| 2213 } | |
| 2214 | |
| 2215 assert(_anchor.walkable() || | |
| 2216 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2217 "must have walkable stack"); | |
| 2218 | |
| 2219 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2220 | |
| 979 | 2221 assert(!this->is_ext_suspended(), |
| 0 | 2222 "a thread trying to self-suspend should not already be suspended"); |
| 2223 | |
| 2224 if (this->is_suspend_equivalent()) { | |
| 2225 // If we are self-suspending as a result of the lifting of a | |
| 2226 // suspend equivalent condition, then the suspend_equivalent | |
| 2227 // flag is not cleared until we set the ext_suspended flag so | |
| 2228 // that wait_for_ext_suspend_completion() returns consistent | |
| 2229 // results. | |
| 2230 this->clear_suspend_equivalent(); | |
| 2231 } | |
| 2232 | |
| 2233 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2234 // above. Or another external suspend request could be waiting for us | |
| 2235 // by the time we return from SR_lock()->wait(). The thread | |
| 2236 // that requested the suspension may already be trying to walk our | |
| 2237 // stack and if we return now, we can change the stack out from under | |
| 2238 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2239 // to crash. We stay self-suspended until there are no more pending | |
| 2240 // external suspend requests. | |
| 2241 while (is_external_suspend()) { | |
| 2242 ret++; | |
| 2243 this->set_ext_suspended(); | |
| 2244 | |
| 2245 // _ext_suspended flag is cleared by java_resume() | |
| 2246 while (is_ext_suspended()) { | |
| 2247 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2248 } | |
| 2249 } | |
| 2250 | |
| 2251 return ret; | |
| 2252 } | |
| 2253 | |
| 2254 #ifdef ASSERT | |
| 2255 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2256 // hence doesn't need protection from concurrent access at this stage | |
| 2257 void JavaThread::verify_not_published() { | |
| 2258 if (!Threads_lock->owned_by_self()) { | |
| 2259 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2260 assert( !Threads::includes(this), | |
| 2261 "java thread shouldn't have been published yet!"); | |
| 2262 } | |
| 2263 else { | |
| 2264 assert( !Threads::includes(this), | |
| 2265 "java thread shouldn't have been published yet!"); | |
| 2266 } | |
| 2267 } | |
| 2268 #endif | |
| 2269 | |
| 2270 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2271 // progress or when _suspend_flags is non-zero. | |
| 2272 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2273 // block if a safepoint is in progress. | |
| 2274 // Async exception ISN'T checked. | |
| 2275 // Note only the ThreadInVMfromNative transition can call this function | |
| 2276 // directly and when thread state is _thread_in_native_trans | |
| 2277 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2278 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2279 | |
| 2280 JavaThread *curJT = JavaThread::current(); | |
| 2281 bool do_self_suspend = thread->is_external_suspend(); | |
| 2282 | |
| 2283 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2284 | |
| 2285 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2286 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2287 // threads could call into the VM with another thread's JNIEnv so we | |
| 2288 // can be here operating on behalf of a suspended thread (4432884). | |
| 2289 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2290 JavaThreadState state = thread->thread_state(); | |
| 2291 | |
| 2292 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2293 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2294 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2295 thread->set_suspend_equivalent(); | |
| 2296 | |
| 2297 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2298 // wait until the thread changes to other thread state. There is no | |
| 2299 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2300 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2301 // too long. Temporarily change the state to _thread_blocked to | |
| 2302 // let the VM thread know that this thread is ready for GC. The problem | |
| 2303 // of changing thread state is that safepoint could happen just after | |
| 2304 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2305 // see the _thread_blocked state. We must check for safepoint | |
| 2306 // after restoring the state and make sure we won't leave while a safepoint | |
| 2307 // is in progress. | |
| 2308 thread->set_thread_state(_thread_blocked); | |
| 2309 thread->java_suspend_self(); | |
| 2310 thread->set_thread_state(state); | |
| 2311 // Make sure new state is seen by VM thread | |
| 2312 if (os::is_MP()) { | |
| 2313 if (UseMembar) { | |
| 2314 // Force a fence between the write above and read below | |
| 2315 OrderAccess::fence(); | |
| 2316 } else { | |
| 2317 // Must use this rather than serialization page in particular on Windows | |
| 2318 InterfaceSupport::serialize_memory(thread); | |
| 2319 } | |
| 2320 } | |
| 2321 } | |
| 2322 | |
| 2323 if (SafepointSynchronize::do_call_back()) { | |
| 2324 // If we are safepointing, then block the caller which may not be | |
| 2325 // the same as the target thread (see above). | |
| 2326 SafepointSynchronize::block(curJT); | |
| 2327 } | |
| 2328 | |
| 2329 if (thread->is_deopt_suspend()) { | |
| 2330 thread->clear_deopt_suspend(); | |
| 2331 RegisterMap map(thread, false); | |
| 2332 frame f = thread->last_frame(); | |
| 2333 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2334 f = f.sender(&map); | |
| 2335 } | |
| 2336 if (f.id() == thread->must_deopt_id()) { | |
| 2337 thread->clear_must_deopt_id(); | |
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2338 f.deoptimize(thread); |
| 0 | 2339 } else { |
| 2340 fatal("missed deoptimization!"); | |
| 2341 } | |
| 2342 } | |
| 2343 } | |
| 2344 | |
| 2345 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2346 // progress or when _suspend_flags is non-zero. | |
| 2347 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2348 // block if a safepoint is in progress. | |
| 2349 // Also check for pending async exception (not including unsafe access error). | |
| 2350 // Note only the native==>VM/Java barriers can call this function and when | |
| 2351 // thread state is _thread_in_native_trans. | |
| 2352 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2353 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2354 | |
| 2355 if (thread->has_async_exception()) { | |
| 2356 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2357 // access error since that may block. | |
| 2358 thread->check_and_handle_async_exceptions(false); | |
| 2359 } | |
| 2360 } | |
| 2361 | |
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2362 // This is a variant of the normal |
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2363 // check_special_condition_for_native_trans with slightly different |
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2364 // semantics for use by critical native wrappers. It does all the |
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2365 // normal checks but also performs the transition back into |
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2366 // thread_in_Java state. This is required so that critical natives |
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2367 // can potentially block and perform a GC if they are the last thread |
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2368 // exiting the GC_locker. |
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2369 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2370 check_special_condition_for_native_trans(thread); |
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2371 |
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2372 // Finish the transition |
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2373 thread->set_thread_state(_thread_in_Java); |
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2374 |
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2375 if (thread->do_critical_native_unlock()) { |
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2376 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2377 GC_locker::unlock_critical(thread); |
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2378 thread->clear_critical_native_unlock(); |
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2379 } |
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2380 } |
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2381 |
| 0 | 2382 // We need to guarantee the Threads_lock here, since resumes are not |
| 2383 // allowed during safepoint synchronization | |
| 2384 // Can only resume from an external suspension | |
| 2385 void JavaThread::java_resume() { | |
| 2386 assert_locked_or_safepoint(Threads_lock); | |
| 2387 | |
| 2388 // Sanity check: thread is gone, has started exiting or the thread | |
| 2389 // was not externally suspended. | |
| 2390 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2391 return; | |
| 2392 } | |
| 2393 | |
| 2394 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2395 | |
| 2396 clear_external_suspend(); | |
| 2397 | |
| 2398 if (is_ext_suspended()) { | |
| 2399 clear_ext_suspended(); | |
| 2400 SR_lock()->notify_all(); | |
| 2401 } | |
| 2402 } | |
| 2403 | |
| 2404 void JavaThread::create_stack_guard_pages() { | |
| 2405 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2406 address low_addr = stack_base() - stack_size(); | |
| 2407 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2408 | |
| 2409 int allocate = os::allocate_stack_guard_pages(); | |
| 2410 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2411 | |
|
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2412 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2413 warning("Attempt to allocate stack guard pages failed."); |
| 2414 return; | |
| 2415 } | |
| 2416 | |
| 2417 if (os::guard_memory((char *) low_addr, len)) { | |
| 2418 _stack_guard_state = stack_guard_enabled; | |
| 2419 } else { | |
| 2420 warning("Attempt to protect stack guard pages failed."); | |
| 2421 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2422 warning("Attempt to deallocate stack guard pages failed."); | |
| 2423 } | |
| 2424 } | |
| 2425 } | |
| 2426 | |
| 2427 void JavaThread::remove_stack_guard_pages() { | |
| 2428 if (_stack_guard_state == stack_guard_unused) return; | |
| 2429 address low_addr = stack_base() - stack_size(); | |
| 2430 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2431 | |
| 2432 if (os::allocate_stack_guard_pages()) { | |
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2433 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2434 _stack_guard_state = stack_guard_unused; |
| 2435 } else { | |
| 2436 warning("Attempt to deallocate stack guard pages failed."); | |
| 2437 } | |
| 2438 } else { | |
| 2439 if (_stack_guard_state == stack_guard_unused) return; | |
| 2440 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2441 _stack_guard_state = stack_guard_unused; | |
| 2442 } else { | |
| 2443 warning("Attempt to unprotect stack guard pages failed."); | |
| 2444 } | |
| 2445 } | |
| 2446 } | |
| 2447 | |
| 2448 void JavaThread::enable_stack_yellow_zone() { | |
| 2449 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2450 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2451 | |
| 2452 // The base notation is from the stacks point of view, growing downward. | |
| 2453 // We need to adjust it to work correctly with guard_memory() | |
| 2454 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2455 | |
| 2456 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2457 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2458 | |
| 2459 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2460 _stack_guard_state = stack_guard_enabled; | |
| 2461 } else { | |
| 2462 warning("Attempt to guard stack yellow zone failed."); | |
| 2463 } | |
| 2464 enable_register_stack_guard(); | |
| 2465 } | |
| 2466 | |
| 2467 void JavaThread::disable_stack_yellow_zone() { | |
| 2468 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2469 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2470 | |
| 2471 // Simply return if called for a thread that does not use guard pages. | |
| 2472 if (_stack_guard_state == stack_guard_unused) return; | |
| 2473 | |
| 2474 // The base notation is from the stacks point of view, growing downward. | |
| 2475 // We need to adjust it to work correctly with guard_memory() | |
| 2476 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2477 | |
| 2478 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2479 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2480 } else { | |
| 2481 warning("Attempt to unguard stack yellow zone failed."); | |
| 2482 } | |
| 2483 disable_register_stack_guard(); | |
| 2484 } | |
| 2485 | |
| 2486 void JavaThread::enable_stack_red_zone() { | |
| 2487 // The base notation is from the stacks point of view, growing downward. | |
| 2488 // We need to adjust it to work correctly with guard_memory() | |
| 2489 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2490 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2491 | |
| 2492 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2493 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2494 | |
| 2495 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2496 warning("Attempt to guard stack red zone failed."); | |
| 2497 } | |
| 2498 } | |
| 2499 | |
| 2500 void JavaThread::disable_stack_red_zone() { | |
| 2501 // The base notation is from the stacks point of view, growing downward. | |
| 2502 // We need to adjust it to work correctly with guard_memory() | |
| 2503 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2504 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2505 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2506 warning("Attempt to unguard stack red zone failed."); | |
| 2507 } | |
| 2508 } | |
| 2509 | |
| 2510 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2511 // ignore is there is no stack | |
| 2512 if (!has_last_Java_frame()) return; | |
| 2513 // traverse the stack frames. Starts from top frame. | |
| 2514 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2515 frame* fr = fst.current(); | |
| 2516 f(fr, fst.register_map()); | |
| 2517 } | |
| 2518 } | |
| 2519 | |
| 2520 | |
| 2521 #ifndef PRODUCT | |
| 2522 // Deoptimization | |
| 2523 // Function for testing deoptimization | |
| 2524 void JavaThread::deoptimize() { | |
| 2525 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2526 StackFrameStream fst(this, UseBiasedLocking); | |
| 2527 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2528 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2529 // Iterate over all frames in the thread and deoptimize | |
| 2530 for(; !fst.is_done(); fst.next()) { | |
| 2531 if(fst.current()->can_be_deoptimized()) { | |
| 2532 | |
| 2533 if (only_at) { | |
| 2534 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2535 // consists of comma or carriage return separated numbers so | |
| 2536 // search for the current bci in that string. | |
| 2537 address pc = fst.current()->pc(); | |
| 2538 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2539 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2540 char buffer[8]; | |
| 2541 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2542 size_t len = strlen(buffer); | |
| 2543 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2544 while (found != NULL) { | |
| 2545 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2546 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2547 // Check that the bci found is bracketed by terminators. | |
| 2548 break; | |
| 2549 } | |
| 2550 found = strstr(found + 1, buffer); | |
| 2551 } | |
| 2552 if (!found) { | |
| 2553 continue; | |
| 2554 } | |
| 2555 } | |
| 2556 | |
| 2557 if (DebugDeoptimization && !deopt) { | |
| 2558 deopt = true; // One-time only print before deopt | |
| 2559 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2560 trace_frames(); | |
| 2561 trace_stack(); | |
| 2562 } | |
| 2563 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2564 } | |
| 2565 } | |
| 2566 | |
| 2567 if (DebugDeoptimization && deopt) { | |
| 2568 tty->print_cr("[AFTER Deoptimization]"); | |
| 2569 trace_frames(); | |
| 2570 } | |
| 2571 } | |
| 2572 | |
| 2573 | |
| 2574 // Make zombies | |
| 2575 void JavaThread::make_zombies() { | |
| 2576 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2577 if (fst.current()->can_be_deoptimized()) { | |
| 2578 // it is a Java nmethod | |
| 2579 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2580 nm->make_not_entrant(); | |
| 2581 } | |
| 2582 } | |
| 2583 } | |
| 2584 #endif // PRODUCT | |
| 2585 | |
| 2586 | |
| 2587 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2588 if (!has_last_Java_frame()) return; | |
| 2589 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2590 StackFrameStream fst(this, UseBiasedLocking); | |
| 2591 for(; !fst.is_done(); fst.next()) { | |
| 2592 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2593 if (LogCompilation && xtty != NULL) { |
| 2594 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2595 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2596 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2597 } | |
| 2598 | |
| 0 | 2599 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2600 } | |
| 2601 } | |
| 2602 } | |
| 2603 | |
| 2604 | |
| 2605 // GC support | |
| 2606 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2607 | |
| 2608 void JavaThread::gc_epilogue() { | |
| 2609 frames_do(frame_gc_epilogue); | |
| 2610 } | |
| 2611 | |
| 2612 | |
| 2613 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2614 | |
| 2615 void JavaThread::gc_prologue() { | |
| 2616 frames_do(frame_gc_prologue); | |
| 2617 } | |
| 2618 | |
|
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2619 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2620 // the given JavaThread in its _processed_thread field. |
|
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2621 class RememberProcessedThread: public StackObj { |
|
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2622 NamedThread* _cur_thr; |
|
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2623 public: |
|
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|
2624 RememberProcessedThread(JavaThread* jthr) { |
|
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2625 Thread* thread = Thread::current(); |
|
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2626 if (thread->is_Named_thread()) { |
|
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2627 _cur_thr = (NamedThread *)thread; |
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2628 _cur_thr->set_processed_thread(jthr); |
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2629 } else { |
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2630 _cur_thr = NULL; |
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2631 } |
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2632 } |
|
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2633 |
|
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2634 ~RememberProcessedThread() { |
|
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2635 if (_cur_thr) { |
|
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2636 _cur_thr->set_processed_thread(NULL); |
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2637 } |
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2638 } |
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|
2639 }; |
| 0 | 2640 |
|
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|
2641 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2642 // Verify that the deferred card marks have been flushed. |
| 2643 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2644 |
| 0 | 2645 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2646 // since there may be more than one thread using each ThreadProfiler. | |
| 2647 | |
| 2648 // Traverse the GCHandles | |
|
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|
2649 Thread::oops_do(f, cf); |
| 0 | 2650 |
| 2651 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2652 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2653 | |
| 2654 if (has_last_Java_frame()) { | |
|
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2655 // Record JavaThread to GC thread |
|
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|
2656 RememberProcessedThread rpt(this); |
| 0 | 2657 |
| 2658 // Traverse the privileged stack | |
| 2659 if (_privileged_stack_top != NULL) { | |
| 2660 _privileged_stack_top->oops_do(f); | |
| 2661 } | |
| 2662 | |
| 2663 // traverse the registered growable array | |
| 2664 if (_array_for_gc != NULL) { | |
| 2665 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2666 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2667 } | |
| 2668 } | |
| 2669 | |
| 2670 // Traverse the monitor chunks | |
| 2671 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2672 chunk->oops_do(f); | |
| 2673 } | |
| 2674 | |
| 2675 // Traverse the execution stack | |
| 2676 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2677 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2678 } |
| 2679 } | |
| 2680 | |
| 2681 // callee_target is never live across a gc point so NULL it here should | |
| 2682 // it still contain a methdOop. | |
| 2683 | |
| 2684 set_callee_target(NULL); | |
| 2685 | |
| 2686 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2687 // If we have deferred set_locals there might be oops waiting to be | |
| 2688 // written | |
| 2689 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2690 if (list != NULL) { | |
| 2691 for (int i = 0; i < list->length(); i++) { | |
| 2692 list->at(i)->oops_do(f); | |
| 2693 } | |
| 2694 } | |
| 2695 | |
| 2696 // Traverse instance variables at the end since the GC may be moving things | |
| 2697 // around using this function | |
| 2698 f->do_oop((oop*) &_threadObj); | |
| 2699 f->do_oop((oop*) &_vm_result); | |
| 2700 f->do_oop((oop*) &_exception_oop); | |
| 2701 f->do_oop((oop*) &_pending_async_exception); | |
| 2702 | |
| 2703 if (jvmti_thread_state() != NULL) { | |
| 2704 jvmti_thread_state()->oops_do(f); | |
| 2705 } | |
| 2706 } | |
| 2707 | |
|
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2708 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2709 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2710 |
| 2711 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2712 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2713 | |
| 2714 if (has_last_Java_frame()) { | |
| 2715 // Traverse the execution stack | |
| 2716 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2717 fst.current()->nmethods_do(cf); |
| 0 | 2718 } |
| 2719 } | |
| 2720 } | |
| 2721 | |
|
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2722 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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2723 Thread::metadata_do(f); |
|
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2724 if (has_last_Java_frame()) { |
|
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2725 // Traverse the execution stack to call f() on the methods in the stack |
|
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2726 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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|
2727 fst.current()->metadata_do(f); |
|
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|
2728 } |
|
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|
2729 } else if (is_Compiler_thread()) { |
|
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2730 // need to walk ciMetadata in current compile tasks to keep alive. |
|
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|
2731 CompilerThread* ct = (CompilerThread*)this; |
|
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|
2732 if (ct->env() != NULL) { |
|
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|
2733 ct->env()->metadata_do(f); |
|
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|
2734 } |
|
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|
2735 } |
|
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|
2736 } |
|
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|
2737 |
| 0 | 2738 // Printing |
| 2739 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2740 switch (_thread_state) { | |
| 2741 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2742 case _thread_new: return "_thread_new"; | |
| 2743 case _thread_new_trans: return "_thread_new_trans"; | |
| 2744 case _thread_in_native: return "_thread_in_native"; | |
| 2745 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2746 case _thread_in_vm: return "_thread_in_vm"; | |
| 2747 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2748 case _thread_in_Java: return "_thread_in_Java"; | |
| 2749 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2750 case _thread_blocked: return "_thread_blocked"; | |
| 2751 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2752 default: return "unknown thread state"; | |
| 2753 } | |
| 2754 } | |
| 2755 | |
| 2756 #ifndef PRODUCT | |
| 2757 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2758 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2759 }; | |
| 2760 void JavaThread::print_thread_state() const { | |
| 2761 print_thread_state_on(tty); | |
| 2762 }; | |
| 2763 #endif // PRODUCT | |
| 2764 | |
| 2765 // Called by Threads::print() for VM_PrintThreads operation | |
| 2766 void JavaThread::print_on(outputStream *st) const { | |
| 2767 st->print("\"%s\" ", get_thread_name()); | |
| 2768 oop thread_oop = threadObj(); | |
| 6766 | 2769 if (thread_oop != NULL) { |
| 2770 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2771 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2772 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2773 } | |
| 0 | 2774 Thread::print_on(st); |
| 2775 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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2776 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2777 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2778 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2779 } | |
| 2780 #ifndef PRODUCT | |
| 2781 print_thread_state_on(st); | |
| 2782 _safepoint_state->print_on(st); | |
| 2783 #endif // PRODUCT | |
| 2784 } | |
| 2785 | |
| 2786 // Called by fatal error handler. The difference between this and | |
| 2787 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2788 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2789 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2790 oop thread_obj = threadObj(); | |
| 2791 if (thread_obj != NULL) { | |
| 2792 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2793 } | |
| 2794 st->print(" ["); | |
| 2795 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2796 if (osthread()) { | |
| 2797 st->print(", id=%d", osthread()->thread_id()); | |
| 2798 } | |
| 2799 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2800 _stack_base - _stack_size, _stack_base); | |
| 2801 st->print("]"); | |
| 2802 return; | |
| 2803 } | |
| 2804 | |
| 2805 // Verification | |
| 2806 | |
| 2807 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2808 | |
| 2809 void JavaThread::verify() { | |
| 2810 // Verify oops in the thread. | |
|
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2811 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2812 |
| 2813 // Verify the stack frames. | |
| 2814 frames_do(frame_verify); | |
| 2815 } | |
| 2816 | |
| 2817 // CR 6300358 (sub-CR 2137150) | |
| 2818 // Most callers of this method assume that it can't return NULL but a | |
| 2819 // thread may not have a name whilst it is in the process of attaching to | |
| 2820 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2821 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2822 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2823 // for such that this method never returns NULL. | |
| 2824 const char* JavaThread::get_thread_name() const { | |
| 2825 #ifdef ASSERT | |
| 2826 // early safepoints can hit while current thread does not yet have TLS | |
| 2827 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2828 Thread *cur = Thread::current(); | |
| 2829 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2830 // Current JavaThreads are allowed to get their own name without | |
| 2831 // the Threads_lock. | |
| 2832 assert_locked_or_safepoint(Threads_lock); | |
| 2833 } | |
| 2834 } | |
| 2835 #endif // ASSERT | |
| 2836 return get_thread_name_string(); | |
| 2837 } | |
| 2838 | |
| 2839 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2840 // descriptive string if there is no set name | |
| 2841 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2842 const char* name_str; | |
| 2843 oop thread_obj = threadObj(); | |
| 2844 if (thread_obj != NULL) { | |
| 2845 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2846 if (name != NULL) { | |
| 2847 if (buf == NULL) { | |
| 2848 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2849 } | |
| 2850 else { | |
| 2851 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2852 } | |
| 2853 } | |
| 4006 | 2854 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2855 name_str = "<no-name - thread is attaching>"; |
| 2856 } | |
| 2857 else { | |
| 2858 name_str = Thread::name(); | |
| 2859 } | |
| 2860 } | |
| 2861 else { | |
| 2862 name_str = Thread::name(); | |
| 2863 } | |
| 2864 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2865 return name_str; | |
| 2866 } | |
| 2867 | |
| 2868 | |
| 2869 const char* JavaThread::get_threadgroup_name() const { | |
| 2870 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2871 oop thread_obj = threadObj(); | |
| 2872 if (thread_obj != NULL) { | |
| 2873 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2874 if (thread_group != NULL) { | |
| 2875 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2876 // ThreadGroup.name can be null | |
| 2877 if (name != NULL) { | |
| 2878 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2879 return str; | |
| 2880 } | |
| 2881 } | |
| 2882 } | |
| 2883 return NULL; | |
| 2884 } | |
| 2885 | |
| 2886 const char* JavaThread::get_parent_name() const { | |
| 2887 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2888 oop thread_obj = threadObj(); | |
| 2889 if (thread_obj != NULL) { | |
| 2890 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2891 if (thread_group != NULL) { | |
| 2892 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2893 if (parent != NULL) { | |
| 2894 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2895 // ThreadGroup.name can be null | |
| 2896 if (name != NULL) { | |
| 2897 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2898 return str; | |
| 2899 } | |
| 2900 } | |
| 2901 } | |
| 2902 } | |
| 2903 return NULL; | |
| 2904 } | |
| 2905 | |
| 2906 ThreadPriority JavaThread::java_priority() const { | |
| 2907 oop thr_oop = threadObj(); | |
| 2908 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2909 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2910 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2911 return priority; | |
| 2912 } | |
| 2913 | |
| 2914 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2915 | |
| 2916 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2917 // Link Java Thread object <-> C++ Thread | |
| 2918 | |
| 2919 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2920 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2921 // be used to pass the C++ thread object to other methods. | |
| 2922 | |
| 2923 // Set the Java level thread object (jthread) field of the | |
| 2924 // new thread (a JavaThread *) to C++ thread object using the | |
| 2925 // "thread_oop" handle. | |
| 2926 | |
| 2927 // Set the thread field (a JavaThread *) of the | |
| 2928 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2929 | |
| 2930 Handle thread_oop(Thread::current(), | |
| 2931 JNIHandles::resolve_non_null(jni_thread)); | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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parents:
6198
diff
changeset
|
2932 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 2933 "must be initialized"); |
| 2934 set_threadObj(thread_oop()); | |
| 2935 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2936 | |
| 2937 if (prio == NoPriority) { | |
| 2938 prio = java_lang_Thread::priority(thread_oop()); | |
| 2939 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2940 } | |
| 2941 | |
| 2942 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2943 Thread::set_priority(this, prio); | |
| 2944 | |
| 2945 // Add the new thread to the Threads list and set it in motion. | |
| 2946 // We must have threads lock in order to call Threads::add. | |
| 2947 // It is crucial that we do not block before the thread is | |
| 2948 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2949 // will not be visited by GC. | |
| 2950 Threads::add(this); | |
| 2951 } | |
| 2952 | |
| 2953 oop JavaThread::current_park_blocker() { | |
| 2954 // Support for JSR-166 locks | |
| 2955 oop thread_oop = threadObj(); | |
| 242 | 2956 if (thread_oop != NULL && |
| 2957 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2958 return java_lang_Thread::park_blocker(thread_oop); |
| 2959 } | |
| 2960 return NULL; | |
| 2961 } | |
| 2962 | |
| 2963 | |
| 2964 void JavaThread::print_stack_on(outputStream* st) { | |
| 2965 if (!has_last_Java_frame()) return; | |
| 2966 ResourceMark rm; | |
| 2967 HandleMark hm; | |
| 2968 | |
| 2969 RegisterMap reg_map(this); | |
| 2970 vframe* start_vf = last_java_vframe(®_map); | |
| 2971 int count = 0; | |
| 2972 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2973 if (f->is_java_frame()) { | |
| 2974 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2975 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2976 | |
| 2977 // Print out lock information | |
| 2978 if (JavaMonitorsInStackTrace) { | |
| 2979 jvf->print_lock_info_on(st, count); | |
| 2980 } | |
| 2981 } else { | |
| 2982 // Ignore non-Java frames | |
| 2983 } | |
| 2984 | |
| 2985 // Bail-out case for too deep stacks | |
| 2986 count++; | |
| 2987 if (MaxJavaStackTraceDepth == count) return; | |
| 2988 } | |
| 2989 } | |
| 2990 | |
| 2991 | |
| 2992 // JVMTI PopFrame support | |
| 2993 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2994 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2995 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 2996 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 2997 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
1603
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6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
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1584
diff
changeset
|
2998 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 2999 } |
| 3000 } | |
| 3001 | |
| 3002 void* JavaThread::popframe_preserved_args() { | |
| 3003 return _popframe_preserved_args; | |
| 3004 } | |
| 3005 | |
| 3006 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3007 return in_ByteSize(_popframe_preserved_args_size); | |
| 3008 } | |
| 3009 | |
| 3010 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3011 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3012 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3013 return in_WordSize(sz / wordSize); | |
| 3014 } | |
| 3015 | |
| 3016 void JavaThread::popframe_free_preserved_args() { | |
| 3017 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3018 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3019 _popframe_preserved_args = NULL; |
| 3020 _popframe_preserved_args_size = 0; | |
| 3021 } | |
| 3022 | |
| 3023 #ifndef PRODUCT | |
| 3024 | |
| 3025 void JavaThread::trace_frames() { | |
| 3026 tty->print_cr("[Describe stack]"); | |
| 3027 int frame_no = 1; | |
| 3028 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3029 tty->print(" %d. ", frame_no++); | |
| 3030 fst.current()->print_value_on(tty,this); | |
| 3031 tty->cr(); | |
| 3032 } | |
| 3033 } | |
| 3034 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3035 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3036 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3037 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3038 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3039 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3040 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3041 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3042 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3043 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3044 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3045 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3046 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3047 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3048 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
|
3049 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3050 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3051 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3052 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3053 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
|
3054 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3055 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3056 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3057 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3058 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3059 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3060 f->print_value(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3061 f->oops_do(&print, NULL, (RegisterMap*)map); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3062 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3063 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3064 // Print our all the locations that contain oops and whether they are |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3065 // valid or not. This useful when trying to find the oldest frame |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3066 // 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
|
3067 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3068 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3069 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3070 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3071 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3072 |
| 0 | 3073 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3074 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3075 // 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
|
3076 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3077 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3078 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3079 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3080 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3081 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3082 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3083 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3084 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3085 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3086 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3087 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3088 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3089 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3090 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3091 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3092 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3093 |
| 0 | 3094 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3095 ResourceMark rm; | |
| 3096 int vframe_no = 1; | |
| 3097 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3098 if (f->is_java_frame()) { | |
| 3099 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3100 } else { | |
| 3101 f->print(); | |
| 3102 } | |
| 3103 if (vframe_no > StackPrintLimit) { | |
| 3104 tty->print_cr("...<more frames>..."); | |
| 3105 return; | |
| 3106 } | |
| 3107 } | |
| 3108 } | |
| 3109 | |
| 3110 | |
| 3111 void JavaThread::trace_stack() { | |
| 3112 if (!has_last_Java_frame()) return; | |
| 3113 ResourceMark rm; | |
| 3114 HandleMark hm; | |
| 3115 RegisterMap reg_map(this); | |
| 3116 trace_stack_from(last_java_vframe(®_map)); | |
| 3117 } | |
| 3118 | |
| 3119 | |
| 3120 #endif // PRODUCT | |
| 3121 | |
| 3122 | |
| 3123 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3124 assert(reg_map != NULL, "a map must be given"); | |
| 3125 frame f = last_frame(); | |
| 3126 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3127 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3128 } | |
| 3129 return NULL; | |
| 3130 } | |
| 3131 | |
| 3132 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3133 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3134 vframeStream vfst(this); |
| 3135 vfst.security_get_caller_frame(depth); | |
| 3136 if (!vfst.at_end()) { | |
| 3137 return vfst.method()->method_holder(); | |
| 3138 } | |
| 3139 return NULL; | |
| 3140 } | |
| 3141 | |
| 3142 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3143 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3144 CompileBroker::compiler_thread_loop(); | |
| 3145 } | |
| 3146 | |
| 3147 // Create a CompilerThread | |
| 3148 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3149 : JavaThread(&compiler_thread_entry) { | |
| 3150 _env = NULL; | |
| 3151 _log = NULL; | |
| 3152 _task = NULL; | |
| 3153 _queue = queue; | |
| 3154 _counters = counters; | |
| 1584 | 3155 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3156 _scanned_nmethod = NULL; |
| 0 | 3157 |
| 3158 #ifndef PRODUCT | |
| 3159 _ideal_graph_printer = NULL; | |
| 3160 #endif | |
| 3161 } | |
| 3162 | |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3163 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3164 JavaThread::oops_do(f, cf); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3165 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3166 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
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|
3167 // process it here to make sure it isn't unloaded in the middle of |
|
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|
3168 // a scan. |
|
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|
3169 cf->do_code_blob(_scanned_nmethod); |
|
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|
3170 } |
|
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|
3171 } |
| 0 | 3172 |
| 3173 // ======= Threads ======== | |
| 3174 | |
| 3175 // The Threads class links together all active threads, and provides | |
| 3176 // operations over all threads. It is protected by its own Mutex | |
| 3177 // lock, which is also used in other contexts to protect thread | |
| 3178 // operations from having the thread being operated on from exiting | |
| 3179 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3180 | |
| 3181 JavaThread* Threads::_thread_list = NULL; | |
| 3182 int Threads::_number_of_threads = 0; | |
| 3183 int Threads::_number_of_non_daemon_threads = 0; | |
| 3184 int Threads::_return_code = 0; | |
| 3185 size_t JavaThread::_stack_size_at_create = 0; | |
|
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3186 #ifdef ASSERT |
|
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3187 bool Threads::_vm_complete = false; |
|
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|
3188 #endif |
| 0 | 3189 |
| 3190 // All JavaThreads | |
| 3191 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3192 | |
| 3193 void os_stream(); | |
| 3194 | |
| 3195 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3196 void Threads::threads_do(ThreadClosure* tc) { | |
| 3197 assert_locked_or_safepoint(Threads_lock); | |
| 3198 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3199 ALL_JAVA_THREADS(p) { | |
| 3200 tc->do_thread(p); | |
| 3201 } | |
| 3202 // Someday we could have a table or list of all non-JavaThreads. | |
| 3203 // For now, just manually iterate through them. | |
| 3204 tc->do_thread(VMThread::vm_thread()); | |
| 3205 Universe::heap()->gc_threads_do(tc); | |
|
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|
3206 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
3207 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3208 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3209 // considering that WatchThread terminates when the VM is on the way to |
|
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|
3210 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3211 // way to prevent termination of WatcherThread would be to acquire |
|
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|
3212 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3213 // checking in some cases. |
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|
3214 if (wt != NULL) |
|
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|
3215 tc->do_thread(wt); |
|
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|
3216 |
| 0 | 3217 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3218 } | |
| 3219 | |
| 3220 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3221 | |
| 242 | 3222 extern void JDK_Version_init(); |
| 3223 | |
| 0 | 3224 // Check version |
| 3225 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3226 | |
| 3227 // Initialize the output stream module | |
| 3228 ostream_init(); | |
| 3229 | |
| 3230 // Process java launcher properties. | |
| 3231 Arguments::process_sun_java_launcher_properties(args); | |
| 3232 | |
| 3233 // Initialize the os module before using TLS | |
| 3234 os::init(); | |
| 3235 | |
| 3236 // Initialize system properties. | |
| 3237 Arguments::init_system_properties(); | |
| 3238 | |
| 242 | 3239 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3240 JDK_Version_init(); | |
| 3241 | |
|
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|
3242 // Update/Initialize System properties after JDK version number is known |
|
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|
3243 Arguments::init_version_specific_system_properties(); |
|
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|
3244 |
| 0 | 3245 // Parse arguments |
| 3246 jint parse_result = Arguments::parse(args); | |
| 3247 if (parse_result != JNI_OK) return parse_result; | |
| 3248 | |
| 3249 if (PauseAtStartup) { | |
| 3250 os::pause(); | |
| 3251 } | |
| 3252 | |
| 4006 | 3253 #ifndef USDT2 |
| 0 | 3254 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3255 #else /* USDT2 */ |
| 3256 HOTSPOT_VM_INIT_BEGIN(); | |
| 3257 #endif /* USDT2 */ | |
| 0 | 3258 |
| 3259 // Record VM creation timing statistics | |
| 3260 TraceVmCreationTime create_vm_timer; | |
| 3261 create_vm_timer.start(); | |
| 3262 | |
| 3263 // Timing (must come after argument parsing) | |
| 3264 TraceTime timer("Create VM", TraceStartupTime); | |
| 3265 | |
| 3266 // Initialize the os module after parsing the args | |
| 3267 jint os_init_2_result = os::init_2(); | |
| 3268 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3269 | |
| 6197 | 3270 // intialize TLS |
| 3271 ThreadLocalStorage::init(); | |
| 3272 | |
| 3273 // Bootstrap native memory tracking, so it can start recording memory | |
| 3274 // activities before worker thread is started. This is the first phase | |
| 3275 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3276 MemTracker::bootstrap_single_thread(); | |
| 3277 | |
| 0 | 3278 // Initialize output stream logging |
| 3279 ostream_init_log(); | |
| 3280 | |
| 3281 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3282 // Must be before create_vm_init_agents() | |
| 3283 if (Arguments::init_libraries_at_startup()) { | |
| 3284 convert_vm_init_libraries_to_agents(); | |
| 3285 } | |
| 3286 | |
| 3287 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3288 if (Arguments::init_agents_at_startup()) { | |
| 3289 create_vm_init_agents(); | |
| 3290 } | |
| 3291 | |
| 3292 // Initialize Threads state | |
| 3293 _thread_list = NULL; | |
| 3294 _number_of_threads = 0; | |
| 3295 _number_of_non_daemon_threads = 0; | |
| 3296 | |
| 3297 // Initialize global data structures and create system classes in heap | |
| 3298 vm_init_globals(); | |
| 3299 | |
| 3300 // Attach the main thread to this os thread | |
| 3301 JavaThread* main_thread = new JavaThread(); | |
| 3302 main_thread->set_thread_state(_thread_in_vm); | |
| 3303 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3304 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3305 // change the stack size recorded here to one based on the java thread | |
| 3306 // stacksize. This adjusted size is what is used to figure the placement | |
| 3307 // of the guard pages. | |
| 3308 main_thread->record_stack_base_and_size(); | |
| 3309 main_thread->initialize_thread_local_storage(); | |
| 3310 | |
| 3311 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3312 | |
| 3313 if (!main_thread->set_as_starting_thread()) { | |
| 3314 vm_shutdown_during_initialization( | |
| 3315 "Failed necessary internal allocation. Out of swap space"); | |
| 3316 delete main_thread; | |
| 3317 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3318 return JNI_ENOMEM; | |
| 3319 } | |
| 3320 | |
| 3321 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3322 // crash Linux VM, see notes in os_linux.cpp. | |
| 3323 main_thread->create_stack_guard_pages(); | |
| 3324 | |
| 1878 | 3325 // Initialize Java-Level synchronization subsystem |
| 3326 ObjectMonitor::Initialize() ; | |
| 0 | 3327 |
| 6197 | 3328 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3329 MemTracker::bootstrap_multi_thread(); | |
| 3330 | |
| 0 | 3331 // Initialize global modules |
| 3332 jint status = init_globals(); | |
| 3333 if (status != JNI_OK) { | |
| 3334 delete main_thread; | |
| 3335 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3336 return status; | |
| 3337 } | |
| 3338 | |
|
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|
3339 // Should be done after the heap is fully created |
|
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6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3340 main_thread->cache_global_variables(); |
|
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6953477: Increase portability and flexibility of building Hotspot
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diff
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|
3341 |
| 0 | 3342 HandleMark hm; |
| 3343 | |
| 3344 { MutexLocker mu(Threads_lock); | |
| 3345 Threads::add(main_thread); | |
| 3346 } | |
| 3347 | |
| 3348 // Any JVMTI raw monitors entered in onload will transition into | |
| 3349 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3350 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3351 | |
| 3352 if (VerifyBeforeGC && | |
| 3353 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3354 Universe::heap()->prepare_for_verify(); | |
| 3355 Universe::verify(); // make sure we're starting with a clean slate | |
| 3356 } | |
| 3357 | |
| 6197 | 3358 // Fully start NMT |
| 3359 MemTracker::start(); | |
| 3360 | |
| 0 | 3361 // Create the VMThread |
| 3362 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3363 VMThread::create(); | |
| 3364 Thread* vmthread = VMThread::vm_thread(); | |
| 3365 | |
| 3366 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3367 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3368 | |
| 3369 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3370 // Monitors can have spurious returns, must always check another state flag | |
| 3371 { | |
| 3372 MutexLocker ml(Notify_lock); | |
| 3373 os::start_thread(vmthread); | |
| 3374 while (vmthread->active_handles() == NULL) { | |
| 3375 Notify_lock->wait(); | |
| 3376 } | |
| 3377 } | |
| 3378 } | |
| 3379 | |
| 3380 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3381 EXCEPTION_MARK; | |
| 3382 | |
| 3383 // At this point, the Universe is initialized, but we have not executed | |
| 3384 // any byte code. Now is a good time (the only time) to dump out the | |
| 3385 // internal state of the JVM for sharing. | |
| 3386 if (DumpSharedSpaces) { | |
|
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diff
changeset
|
3387 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3388 ShouldNotReachHere(); |
| 3389 } | |
| 3390 | |
| 3391 // Always call even when there are not JVMTI environments yet, since environments | |
| 3392 // may be attached late and JVMTI must track phases of VM execution | |
| 3393 JvmtiExport::enter_start_phase(); | |
| 3394 | |
| 3395 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3396 JvmtiExport::post_vm_start(); | |
| 3397 | |
| 3398 { | |
| 3399 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3400 | |
| 3401 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3402 create_vm_init_libraries(); | |
| 3403 } | |
| 3404 | |
| 3405 if (InitializeJavaLangString) { | |
|
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diff
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|
3406 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3407 } else { |
| 3408 warning("java.lang.String not initialized"); | |
| 3409 } | |
| 3410 | |
|
18
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|
3411 if (AggressiveOpts) { |
|
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|
3412 { |
|
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diff
changeset
|
3413 // Forcibly initialize java/util/HashMap and mutate the private |
|
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diff
changeset
|
3414 // static final "frontCacheEnabled" field before we start creating instances |
|
18
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6621621: HashMap front cache should be enabled only with AggressiveOpts
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|
3415 #ifdef ASSERT |
|
6725
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|
3416 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3417 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
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6621621: HashMap front cache should be enabled only with AggressiveOpts
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|
3418 #endif |
|
6725
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|
3419 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3420 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3421 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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|
3422 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3423 ik->initialize(CHECK_0); |
|
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diff
changeset
|
3424 fieldDescriptor fd; |
|
6d13fcb3663f
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diff
changeset
|
3425 // Possible we might not find this field; if so, don't break |
|
6d13fcb3663f
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changeset
|
3426 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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|
3427 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
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|
3428 } |
|
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|
3429 } |
|
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|
3430 |
|
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|
3431 if (UseStringCache) { |
|
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|
3432 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
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|
3433 // static final "stringCacheEnabled" field before we start creating instances |
|
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|
3434 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
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|
3435 // Possible that StringValue isn't present: if so, silently don't break |
|
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diff
changeset
|
3436 if (k_o != NULL) { |
|
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|
3437 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3438 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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changeset
|
3439 ik->initialize(CHECK_0); |
|
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6810653: Change String cache class used by Hotspot from String to StringValue
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changeset
|
3440 fieldDescriptor fd; |
|
eca19a8425b5
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changeset
|
3441 // Possible we might not find this field: if so, silently don't break |
|
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|
3442 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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|
3443 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
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|
3444 } |
|
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|
3445 } |
|
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|
3446 } |
|
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|
3447 } |
|
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|
3448 |
| 0 | 3449 // Initialize java_lang.System (needed before creating the thread) |
| 3450 if (InitializeJavaLangSystem) { | |
|
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|
3451 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
3452 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3453 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3454 Universe::set_main_thread_group(thread_group()); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3455 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3456 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3457 main_thread->set_threadObj(thread_object); | |
| 3458 // Set thread status to running since main thread has | |
| 3459 // been started and running. | |
| 3460 java_lang_Thread::set_thread_status(thread_object, | |
| 3461 java_lang_Thread::RUNNABLE); | |
| 3462 | |
| 3463 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3464 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3465 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3466 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3467 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3468 call_initializeSystemClass(CHECK_0); |
| 6181 | 3469 |
| 3470 // get the Java runtime name after java.lang.System is initialized | |
| 3471 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
| 0 | 3472 } else { |
| 3473 warning("java.lang.System not initialized"); | |
| 3474 } | |
| 3475 | |
| 3476 // an instance of OutOfMemory exception has been allocated earlier | |
| 3477 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3478 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3479 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3480 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3481 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3482 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3483 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3484 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3485 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
| 0 | 3486 } else { |
| 3487 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3488 warning("java.lang.NullPointerException has not been initialized"); | |
| 3489 warning("java.lang.ClassCastException has not been initialized"); | |
| 3490 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3491 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3492 warning("java.lang.StackOverflowError has not been initialized"); | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3493 warning("java.lang.IllegalArgumentException has not been initialized"); |
| 0 | 3494 } |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3495 } |
| 0 | 3496 |
| 3497 // See : bugid 4211085. | |
| 3498 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3499 // property"java.compiler" and read & write property "java.vm.info". | |
| 3500 // When a security manager is installed through the command line | |
| 3501 // option "-Djava.security.manager", the above properties are not | |
| 3502 // readable and the static initializer for java.lang.Compiler fails | |
| 3503 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3504 // user code which calls methods in java.lang.Compiler. | |
| 3505 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3506 // system domains are on the stack when the properties are read. | |
| 3507 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3508 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3509 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3510 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3511 // 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
|
3512 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3513 |
| 3514 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3515 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3516 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3517 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3518 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3519 reset_vm_info_property(CHECK_0); | |
| 3520 | |
| 3521 quicken_jni_functions(); | |
| 3522 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3523 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3524 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3525 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3526 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3527 |
| 0 | 3528 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3529 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3530 set_init_completed(); | |
| 3531 | |
| 4006 | 3532 #ifndef USDT2 |
| 0 | 3533 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3534 #else /* USDT2 */ |
| 3535 HOTSPOT_VM_INIT_END(); | |
| 3536 #endif /* USDT2 */ | |
| 0 | 3537 |
| 3538 // record VM initialization completion time | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3539 #if INCLUDE_MANAGEMENT |
| 0 | 3540 Management::record_vm_init_completed(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3541 #endif // INCLUDE_MANAGEMENT |
| 0 | 3542 |
| 3543 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3544 // valid exceptions may be thrown in the process. | |
| 3545 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3546 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3547 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3548 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3549 if (HAS_PENDING_EXCEPTION) { | |
| 3550 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3551 } | |
| 3552 | |
| 3553 #ifndef SERIALGC | |
| 3554 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3555 // 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
|
3556 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3557 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3558 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3559 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3560 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3561 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3562 } |
| 0 | 3563 if (HAS_PENDING_EXCEPTION) { |
| 3564 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3565 } | |
| 3566 } | |
| 3567 #endif // SERIALGC | |
| 3568 | |
| 3569 // Always call even when there are not JVMTI environments yet, since environments | |
| 3570 // may be attached late and JVMTI must track phases of VM execution | |
| 3571 JvmtiExport::enter_live_phase(); | |
| 3572 | |
| 3573 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3574 os::signal_init(); | |
| 3575 | |
| 3576 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3577 if (!DisableAttachMechanism) { | |
| 3578 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3579 AttachListener::init(); | |
| 3580 } | |
| 3581 } | |
| 3582 | |
| 3583 // Launch -Xrun agents | |
| 3584 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3585 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3586 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3587 create_vm_init_libraries(); | |
| 3588 } | |
| 3589 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3590 // 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
|
3591 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3592 |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3593 if (!TRACE_START()) { |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3594 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3595 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3596 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3597 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3598 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3599 } |
| 0 | 3600 |
| 3601 // initialize compiler(s) | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3602 #if defined(COMPILER1) || defined(COMPILER2) |
| 0 | 3603 CompileBroker::compilation_init(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3604 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3605 |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3606 #if INCLUDE_MANAGEMENT |
| 0 | 3607 Management::initialize(THREAD); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3608 #endif // INCLUDE_MANAGEMENT |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3609 |
| 0 | 3610 if (HAS_PENDING_EXCEPTION) { |
| 3611 // management agent fails to start possibly due to | |
| 3612 // configuration problem and is responsible for printing | |
| 3613 // stack trace if appropriate. Simply exit VM. | |
| 3614 vm_exit(1); | |
| 3615 } | |
| 3616 | |
| 3617 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3618 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3619 if (MemProfiling) MemProfiler::engage(); | |
| 3620 StatSampler::engage(); | |
| 3621 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3622 | |
| 3623 BiasedLocking::init(); | |
| 3624 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3625 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3626 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3627 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3628 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3629 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3630 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3631 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3632 } |
| 0 | 3633 |
| 3634 // Start up the WatcherThread if there are any periodic tasks | |
| 3635 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3636 // aren't, late joiners might appear to start slowly (we might | |
| 3637 // take a while to process their first tick). | |
| 3638 if (PeriodicTask::num_tasks() > 0) { | |
| 3639 WatcherThread::start(); | |
| 3640 } | |
| 3641 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3642 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3643 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3644 |
| 0 | 3645 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3646 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3647 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3648 #endif |
| 0 | 3649 return JNI_OK; |
| 3650 } | |
| 3651 | |
| 3652 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3653 extern "C" { | |
| 3654 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3655 } | |
| 3656 // Find a command line agent library and return its entry point for | |
| 3657 // -agentlib: -agentpath: -Xrun | |
| 3658 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3659 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3660 OnLoadEntry_t on_load_entry = NULL; | |
| 3661 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3662 | |
| 3663 if (library == NULL) { | |
| 3664 char buffer[JVM_MAXPATHLEN]; | |
| 3665 char ebuf[1024]; | |
| 3666 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
|
3667 const char *msg = "Could not find agent library "; |
| 0 | 3668 |
| 3669 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3670 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3671 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3672 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
|
3673 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3674 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
|
3675 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3676 // 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
|
3677 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3678 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3679 } |
| 3680 } else { | |
| 3681 // 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
|
3682 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
|
3683 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3684 #ifdef KERNEL |
| 3685 // Download instrument dll | |
| 3686 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3687 char *props = Arguments::get_kernel_properties(); | |
| 3688 char *home = Arguments::get_java_home(); | |
| 3689 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3690 " 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
|
3691 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
| 6197 | 3692 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
| 0 | 3693 jio_snprintf(cmd, length, fmt, home, props); |
| 3694 int status = os::fork_and_exec(cmd); | |
| 3695 FreeHeap(props); | |
| 3696 if (status == -1) { | |
| 3697 warning(cmd); | |
| 3698 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3699 strerror(errno)); | |
| 3700 } | |
| 6197 | 3701 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
| 0 | 3702 // 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
|
3703 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3704 } |
| 3705 #endif // KERNEL | |
| 3706 if (library == NULL) { // Try the local directory | |
| 3707 char ns[1] = {0}; | |
|
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|
3708 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
|
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|
3709 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3710 if (library == NULL) { |
|
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|
3711 const char *sub_msg = " on the library path, with error: "; |
|
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|
3712 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3713 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
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|
3714 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3715 // If we can't find the agent, exit. |
|
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|
3716 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3717 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3718 } |
| 3719 } | |
| 3720 } | |
| 3721 agent->set_os_lib(library); | |
| 3722 } | |
| 3723 | |
| 3724 // Find the OnLoad function. | |
| 3725 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
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|
3726 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3727 if (on_load_entry != NULL) break; |
| 3728 } | |
| 3729 return on_load_entry; | |
| 3730 } | |
| 3731 | |
| 3732 // Find the JVM_OnLoad entry point | |
| 3733 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3734 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3735 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3736 } | |
| 3737 | |
| 3738 // Find the Agent_OnLoad entry point | |
| 3739 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3740 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3741 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3742 } | |
| 3743 | |
| 3744 // For backwards compatibility with -Xrun | |
| 3745 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3746 // treated like -agentpath: | |
| 3747 // Must be called before agent libraries are created | |
| 3748 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3749 AgentLibrary* agent; | |
| 3750 AgentLibrary* next; | |
| 3751 | |
| 3752 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3753 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3754 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3755 | |
| 3756 // If there is an JVM_OnLoad function it will get called later, | |
| 3757 // otherwise see if there is an Agent_OnLoad | |
| 3758 if (on_load_entry == NULL) { | |
| 3759 on_load_entry = lookup_agent_on_load(agent); | |
| 3760 if (on_load_entry != NULL) { | |
| 3761 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3762 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3763 Arguments::convert_library_to_agent(agent); | |
| 3764 } else { | |
| 3765 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3766 } | |
| 3767 } | |
| 3768 } | |
| 3769 } | |
| 3770 | |
| 3771 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3772 // Invokes Agent_OnLoad | |
| 3773 // Called very early -- before JavaThreads exist | |
| 3774 void Threads::create_vm_init_agents() { | |
| 3775 extern struct JavaVM_ main_vm; | |
| 3776 AgentLibrary* agent; | |
| 3777 | |
| 3778 JvmtiExport::enter_onload_phase(); | |
|
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|
3779 |
| 0 | 3780 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3781 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3782 | |
| 3783 if (on_load_entry != NULL) { | |
| 3784 // Invoke the Agent_OnLoad function | |
| 3785 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3786 if (err != JNI_OK) { | |
| 3787 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3788 } | |
| 3789 } else { | |
| 3790 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3791 } | |
| 3792 } | |
| 3793 JvmtiExport::enter_primordial_phase(); | |
| 3794 } | |
| 3795 | |
| 3796 extern "C" { | |
| 3797 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3798 } | |
| 3799 | |
| 3800 void Threads::shutdown_vm_agents() { | |
| 3801 // Send any Agent_OnUnload notifications | |
| 3802 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3803 extern struct JavaVM_ main_vm; | |
| 3804 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3805 | |
| 3806 // Find the Agent_OnUnload function. | |
| 3807 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3808 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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diff
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|
3809 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3810 |
| 3811 // Invoke the Agent_OnUnload function | |
| 3812 if (unload_entry != NULL) { | |
| 3813 JavaThread* thread = JavaThread::current(); | |
| 3814 ThreadToNativeFromVM ttn(thread); | |
| 3815 HandleMark hm(thread); | |
| 3816 (*unload_entry)(&main_vm); | |
| 3817 break; | |
| 3818 } | |
| 3819 } | |
| 3820 } | |
| 3821 } | |
| 3822 | |
| 3823 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3824 // Invokes JVM_OnLoad | |
| 3825 void Threads::create_vm_init_libraries() { | |
| 3826 extern struct JavaVM_ main_vm; | |
| 3827 AgentLibrary* agent; | |
| 3828 | |
| 3829 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3830 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3831 | |
| 3832 if (on_load_entry != NULL) { | |
| 3833 // Invoke the JVM_OnLoad function | |
| 3834 JavaThread* thread = JavaThread::current(); | |
| 3835 ThreadToNativeFromVM ttn(thread); | |
| 3836 HandleMark hm(thread); | |
| 3837 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3838 if (err != JNI_OK) { | |
| 3839 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3840 } | |
| 3841 } else { | |
| 3842 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3843 } | |
| 3844 } | |
| 3845 } | |
| 3846 | |
| 3847 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3848 void JavaThread::invoke_shutdown_hooks() { | |
| 3849 HandleMark hm(this); | |
| 3850 | |
| 3851 // We could get here with a pending exception, if so clear it now. | |
| 3852 if (this->has_pending_exception()) { | |
| 3853 this->clear_pending_exception(); | |
| 3854 } | |
| 3855 | |
| 3856 EXCEPTION_MARK; | |
|
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|
3857 Klass* k = |
|
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diff
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|
3858 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3859 THREAD); |
| 3860 if (k != NULL) { | |
| 3861 // SystemDictionary::resolve_or_null will return null if there was | |
| 3862 // an exception. If we cannot load the Shutdown class, just don't | |
| 3863 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3864 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3865 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3866 // was called, the Shutdown class would have already been loaded | |
| 3867 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3868 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3869 JavaValue result(T_VOID); | |
| 3870 JavaCalls::call_static(&result, | |
| 3871 shutdown_klass, | |
|
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|
3872 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
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diff
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|
3873 vmSymbols::void_method_signature(), |
| 0 | 3874 THREAD); |
| 3875 } | |
| 3876 CLEAR_PENDING_EXCEPTION; | |
| 3877 } | |
| 3878 | |
| 3879 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3880 // the program falls off the end of main(). Another VM exit path is through | |
| 3881 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3882 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3883 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3884 // and VM_Exit op at VM level. | |
| 3885 // | |
| 3886 // Shutdown sequence: | |
| 6197 | 3887 // + Shutdown native memory tracking if it is on |
| 0 | 3888 // + Wait until we are the last non-daemon thread to execute |
| 3889 // <-- every thing is still working at this moment --> | |
| 3890 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3891 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3892 // + Call before_exit(), prepare for VM exit | |
| 3893 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3894 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3895 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3896 // post thread end and vm death events to JVMTI, | |
| 3897 // stop signal thread | |
| 3898 // + Call JavaThread::exit(), it will: | |
| 3899 // > release JNI handle blocks, remove stack guard pages | |
| 3900 // > remove this thread from Threads list | |
| 3901 // <-- no more Java code from this thread after this point --> | |
| 3902 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3903 // the compiler threads at safepoint | |
| 3904 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3905 // + Disable tracing at JNI/JVM barriers | |
| 3906 // + Set _vm_exited flag for threads that are still running native code | |
| 3907 // + Delete this thread | |
| 3908 // + Call exit_globals() | |
| 3909 // > deletes tty | |
| 3910 // > deletes PerfMemory resources | |
| 3911 // + Return to caller | |
| 3912 | |
| 3913 bool Threads::destroy_vm() { | |
| 3914 JavaThread* thread = JavaThread::current(); | |
| 3915 | |
|
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|
3916 #ifdef ASSERT |
|
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|
3917 _vm_complete = false; |
|
da91efe96a93
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|
3918 #endif |
| 0 | 3919 // Wait until we are the last non-daemon thread to execute |
| 3920 { MutexLocker nu(Threads_lock); | |
| 3921 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3922 // This wait should make safepoint checks, wait without a timeout, | |
| 3923 // and wait as a suspend-equivalent condition. | |
| 3924 // | |
| 3925 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3926 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3927 // is waiting for the external suspend request on this thread to | |
| 3928 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3929 // timeout, but that takes time. Making this wait a suspend- | |
| 3930 // equivalent condition solves that timeout problem. | |
| 3931 // | |
| 3932 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3933 Mutex::_as_suspend_equivalent_flag); | |
| 3934 } | |
| 3935 | |
| 6197 | 3936 // Shutdown NMT before exit. Otherwise, |
| 3937 // it will run into trouble when system destroys static variables. | |
| 3938 MemTracker::shutdown(MemTracker::NMT_normal); | |
| 3939 | |
| 0 | 3940 // Hang forever on exit if we are reporting an error. |
| 3941 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3942 os::infinite_sleep(); | |
| 3943 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2203
diff
changeset
|
3944 os::wait_for_keypress_at_exit(); |
| 0 | 3945 |
| 3946 if (JDK_Version::is_jdk12x_version()) { | |
| 3947 // We are the last thread running, so check if finalizers should be run. | |
| 3948 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3949 HandleMark rm(thread); | |
| 3950 Universe::run_finalizers_on_exit(); | |
| 3951 } else { | |
| 3952 // run Java level shutdown hooks | |
| 3953 thread->invoke_shutdown_hooks(); | |
| 3954 } | |
| 3955 | |
| 3956 before_exit(thread); | |
| 3957 | |
| 3958 thread->exit(true); | |
| 3959 | |
| 3960 // Stop VM thread. | |
| 3961 { | |
| 3962 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3963 // GC vm_operations can get caught at the safepoint, and the | |
| 3964 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3965 // to prevent this. The GC vm_operations will not be able to | |
| 3966 // 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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|
3967 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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3388
diff
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|
3968 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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|
3969 // stopped; they remain inactive until the process exits. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3388
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|
3970 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3971 // but these will not be accessing the heap, just some G1-specific side |
|
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|
3972 // data structures that are not accessed by any other threads but them |
|
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|
3973 // after this point in a terminal safepoint. |
|
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|
3974 |
| 0 | 3975 MutexLocker ml(Heap_lock); |
| 3976 | |
| 3977 VMThread::wait_for_vm_thread_exit(); | |
| 3978 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3979 VMThread::destroy(); | |
| 3980 } | |
| 3981 | |
| 3982 // clean up ideal graph printers | |
| 3983 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3984 IdealGraphPrinter::clean_up(); | |
| 3985 #endif | |
| 3986 | |
| 3987 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3988 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3989 // daemon threads executing native code are still running. But they | |
| 3990 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3991 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3992 | |
| 3993 #ifndef PRODUCT | |
| 3994 // disable function tracing at JNI/JVM barriers | |
| 3995 TraceJNICalls = false; | |
| 3996 TraceJVMCalls = false; | |
| 3997 TraceRuntimeCalls = false; | |
| 3998 #endif | |
| 3999 | |
| 4000 VM_Exit::set_vm_exited(); | |
| 4001 | |
| 4002 notify_vm_shutdown(); | |
| 4003 | |
| 4004 delete thread; | |
| 4005 | |
| 4006 // exit_globals() will delete tty | |
| 4007 exit_globals(); | |
| 4008 | |
| 4009 return true; | |
| 4010 } | |
| 4011 | |
| 4012 | |
| 4013 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4014 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4015 return is_supported_jni_version(version); | |
| 4016 } | |
| 4017 | |
| 4018 | |
| 4019 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4020 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4021 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4022 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 4023 return JNI_FALSE; | |
| 4024 } | |
| 4025 | |
| 4026 | |
| 4027 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4028 // The threads lock must be owned at this point | |
| 4029 assert_locked_or_safepoint(Threads_lock); | |
|
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4030 |
|
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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|
4031 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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|
4032 // why it is called here. |
|
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|
4033 p->initialize_queues(); |
| 0 | 4034 p->set_next(_thread_list); |
| 4035 _thread_list = p; | |
| 4036 _number_of_threads++; | |
| 4037 oop threadObj = p->threadObj(); | |
| 4038 bool daemon = true; | |
| 4039 // Bootstrapping problem: threadObj can be null for initial | |
| 4040 // JavaThread (or for threads attached via JNI) | |
| 4041 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4042 _number_of_non_daemon_threads++; | |
| 4043 daemon = false; | |
| 4044 } | |
| 4045 | |
| 6197 | 4046 p->set_safepoint_visible(true); |
| 4047 | |
| 0 | 4048 ThreadService::add_thread(p, daemon); |
| 4049 | |
| 4050 // Possible GC point. | |
|
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|
4051 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4052 } |
| 4053 | |
| 4054 void Threads::remove(JavaThread* p) { | |
| 4055 // Extra scope needed for Thread_lock, so we can check | |
| 4056 // that we do not remove thread without safepoint code notice | |
| 4057 { MutexLocker ml(Threads_lock); | |
| 4058 | |
| 4059 assert(includes(p), "p must be present"); | |
| 4060 | |
| 4061 JavaThread* current = _thread_list; | |
| 4062 JavaThread* prev = NULL; | |
| 4063 | |
| 4064 while (current != p) { | |
| 4065 prev = current; | |
| 4066 current = current->next(); | |
| 4067 } | |
| 4068 | |
| 4069 if (prev) { | |
| 4070 prev->set_next(current->next()); | |
| 4071 } else { | |
| 4072 _thread_list = p->next(); | |
| 4073 } | |
| 4074 _number_of_threads--; | |
| 4075 oop threadObj = p->threadObj(); | |
| 4076 bool daemon = true; | |
| 4077 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4078 _number_of_non_daemon_threads--; | |
| 4079 daemon = false; | |
| 4080 | |
| 4081 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4082 // on destroy_vm will wake up. | |
| 4083 if (number_of_non_daemon_threads() == 1) | |
| 4084 Threads_lock->notify_all(); | |
| 4085 } | |
| 4086 ThreadService::remove_thread(p, daemon); | |
| 4087 | |
| 4088 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4089 // the thread might mess around with locks after this point. This can cause it | |
| 4090 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4091 // of this thread since it is removed from the queue. | |
| 4092 p->set_terminated_value(); | |
| 6197 | 4093 |
| 4094 // Now, this thread is not visible to safepoint | |
| 4095 p->set_safepoint_visible(false); | |
| 4096 | |
| 0 | 4097 } // unlock Threads_lock |
| 4098 | |
| 4099 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4100 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4101 } |
| 4102 | |
| 4103 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4104 bool Threads::includes(JavaThread* p) { | |
| 4105 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4106 ALL_JAVA_THREADS(q) { | |
| 4107 if (q == p ) { | |
| 4108 return true; | |
| 4109 } | |
| 4110 } | |
| 4111 return false; | |
| 4112 } | |
| 4113 | |
| 4114 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4115 // but the garbage collector must provide a safe context for them to run. | |
| 4116 // In particular, these things should never be called when the Threads_lock | |
| 4117 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4118 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4119 // all threads gets blocked when exiting or starting). | |
| 4120 | |
|
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|
4121 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4122 ALL_JAVA_THREADS(p) { |
|
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|
4123 p->oops_do(f, cf); |
| 0 | 4124 } |
|
989
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|
4125 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 4126 } |
| 4127 | |
|
989
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|
4128 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4129 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4130 // root groups. Overhead should be small enough to use all the time, | |
| 4131 // even in sequential code. | |
| 4132 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4133 // Cannot yet substitute active_workers for n_par_threads |
|
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|
4134 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
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|
4135 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4136 // turn off parallelism in process_strong_roots while active_workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4137 // is being used for parallelism elsewhere. |
|
bca17e38de00
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|
4138 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
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|
4139 assert(!is_par || |
|
bca17e38de00
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|
4140 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
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jmasa
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changeset
|
4141 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4142 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4143 ALL_JAVA_THREADS(p) { | |
| 4144 if (p->claim_oops_do(is_par, cp)) { | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
4145 p->oops_do(f, cf); |
| 0 | 4146 } |
| 4147 } | |
| 4148 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
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diff
changeset
|
4149 if (vmt->claim_oops_do(is_par, cp)) { |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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changeset
|
4150 vmt->oops_do(f, cf); |
|
3979
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|
4151 } |
| 0 | 4152 } |
| 4153 | |
| 4154 #ifndef SERIALGC | |
| 4155 // Used by ParallelScavenge | |
| 4156 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4157 ALL_JAVA_THREADS(p) { | |
| 4158 q->enqueue(new ThreadRootsTask(p)); | |
| 4159 } | |
| 4160 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4161 } | |
| 4162 | |
| 4163 // Used by Parallel Old | |
| 4164 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4165 ALL_JAVA_THREADS(p) { | |
| 4166 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4167 } | |
| 4168 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4169 } | |
| 4170 #endif // SERIALGC | |
| 4171 | |
|
989
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|
4172 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4173 ALL_JAVA_THREADS(p) { |
|
989
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|
4174 p->nmethods_do(cf); |
| 0 | 4175 } |
|
989
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changeset
|
4176 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4177 } |
| 4178 | |
|
6725
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|
4179 void Threads::metadata_do(void f(Metadata*)) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
4180 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4181 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
4182 } |
|
da91efe96a93
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|
4183 } |
|
da91efe96a93
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|
4184 |
| 0 | 4185 void Threads::gc_epilogue() { |
| 4186 ALL_JAVA_THREADS(p) { | |
| 4187 p->gc_epilogue(); | |
| 4188 } | |
| 4189 } | |
| 4190 | |
| 4191 void Threads::gc_prologue() { | |
| 4192 ALL_JAVA_THREADS(p) { | |
| 4193 p->gc_prologue(); | |
| 4194 } | |
| 4195 } | |
| 4196 | |
| 4197 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4198 ALL_JAVA_THREADS(p) { | |
| 4199 p->deoptimized_wrt_marked_nmethods(); | |
| 4200 } | |
| 4201 } | |
| 4202 | |
| 4203 | |
| 4204 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4205 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4206 address monitor, bool doLock) { | |
| 4207 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4208 "must grab Threads_lock or be at safepoint"); | |
| 4209 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4210 | |
| 4211 int i = 0; | |
| 4212 { | |
| 4213 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4214 ALL_JAVA_THREADS(p) { | |
| 4215 if (p->is_Compiler_thread()) continue; | |
| 4216 | |
| 4217 address pending = (address)p->current_pending_monitor(); | |
| 4218 if (pending == monitor) { // found a match | |
| 4219 if (i < count) result->append(p); // save the first count matches | |
| 4220 i++; | |
| 4221 } | |
| 4222 } | |
| 4223 } | |
| 4224 return result; | |
| 4225 } | |
| 4226 | |
| 4227 | |
| 4228 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4229 assert(doLock || | |
| 4230 Threads_lock->owned_by_self() || | |
| 4231 SafepointSynchronize::is_at_safepoint(), | |
| 4232 "must grab Threads_lock or be at safepoint"); | |
| 4233 | |
| 4234 // NULL owner means not locked so we can skip the search | |
| 4235 if (owner == NULL) return NULL; | |
| 4236 | |
| 4237 { | |
| 4238 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4239 ALL_JAVA_THREADS(p) { | |
| 4240 // first, see if owner is the address of a Java thread | |
| 4241 if (owner == (address)p) return p; | |
| 4242 } | |
| 4243 } | |
| 4244 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4245 if (UseHeavyMonitors) return NULL; | |
| 4246 | |
| 4247 // | |
| 4248 // If we didn't find a matching Java thread and we didn't force use of | |
| 4249 // heavyweight monitors, then the owner is the stack address of the | |
| 4250 // Lock Word in the owning Java thread's stack. | |
| 4251 // | |
| 4252 JavaThread* the_owner = NULL; | |
| 4253 { | |
| 4254 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4255 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4256 if (q->is_lock_owned(owner)) { |
| 0 | 4257 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
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669
diff
changeset
|
4258 break; |
| 0 | 4259 } |
| 4260 } | |
| 4261 } | |
| 4262 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4263 return the_owner; | |
| 4264 } | |
| 4265 | |
| 4266 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4267 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4268 char buf[32]; | |
| 4269 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4270 | |
| 4271 st->print_cr("Full thread dump %s (%s %s):", | |
| 4272 Abstract_VM_Version::vm_name(), | |
| 4273 Abstract_VM_Version::vm_release(), | |
| 4274 Abstract_VM_Version::vm_info_string() | |
| 4275 ); | |
| 4276 st->cr(); | |
| 4277 | |
| 4278 #ifndef SERIALGC | |
| 4279 // Dump concurrent locks | |
| 4280 ConcurrentLocksDump concurrent_locks; | |
| 4281 if (print_concurrent_locks) { | |
| 4282 concurrent_locks.dump_at_safepoint(); | |
| 4283 } | |
| 4284 #endif // SERIALGC | |
| 4285 | |
| 4286 ALL_JAVA_THREADS(p) { | |
| 4287 ResourceMark rm; | |
| 4288 p->print_on(st); | |
| 4289 if (print_stacks) { | |
| 4290 if (internal_format) { | |
| 4291 p->trace_stack(); | |
| 4292 } else { | |
| 4293 p->print_stack_on(st); | |
| 4294 } | |
| 4295 } | |
| 4296 st->cr(); | |
| 4297 #ifndef SERIALGC | |
| 4298 if (print_concurrent_locks) { | |
| 4299 concurrent_locks.print_locks_on(p, st); | |
| 4300 } | |
| 4301 #endif // SERIALGC | |
| 4302 } | |
| 4303 | |
| 4304 VMThread::vm_thread()->print_on(st); | |
| 4305 st->cr(); | |
| 4306 Universe::heap()->print_gc_threads_on(st); | |
| 4307 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4308 if (wt != NULL) { |
| 4309 wt->print_on(st); | |
| 4310 st->cr(); | |
| 4311 } | |
| 0 | 4312 CompileBroker::print_compiler_threads_on(st); |
| 4313 st->flush(); | |
| 4314 } | |
| 4315 | |
| 4316 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4317 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4318 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4319 // memory (even in resource area), it might deadlock the error handler. | |
| 4320 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4321 bool found_current = false; | |
| 4322 st->print_cr("Java Threads: ( => current thread )"); | |
| 4323 ALL_JAVA_THREADS(thread) { | |
| 4324 bool is_current = (current == thread); | |
| 4325 found_current = found_current || is_current; | |
| 4326 | |
| 4327 st->print("%s", is_current ? "=>" : " "); | |
| 4328 | |
| 4329 st->print(PTR_FORMAT, thread); | |
| 4330 st->print(" "); | |
| 4331 thread->print_on_error(st, buf, buflen); | |
| 4332 st->cr(); | |
| 4333 } | |
| 4334 st->cr(); | |
| 4335 | |
| 4336 st->print_cr("Other Threads:"); | |
| 4337 if (VMThread::vm_thread()) { | |
| 4338 bool is_current = (current == VMThread::vm_thread()); | |
| 4339 found_current = found_current || is_current; | |
| 4340 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4341 | |
| 4342 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4343 st->print(" "); | |
| 4344 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4345 st->cr(); | |
| 4346 } | |
| 4347 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4348 if (wt != NULL) { | |
| 4349 bool is_current = (current == wt); | |
| 4350 found_current = found_current || is_current; | |
| 4351 st->print("%s", is_current ? "=>" : " "); | |
| 4352 | |
| 4353 st->print(PTR_FORMAT, wt); | |
| 4354 st->print(" "); | |
| 4355 wt->print_on_error(st, buf, buflen); | |
| 4356 st->cr(); | |
| 4357 } | |
| 4358 if (!found_current) { | |
| 4359 st->cr(); | |
| 4360 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4361 current->print_on_error(st, buf, buflen); | |
| 4362 st->cr(); | |
| 4363 } | |
| 4364 } | |
| 4365 | |
| 1878 | 4366 // Internal SpinLock and Mutex |
| 4367 // Based on ParkEvent | |
| 4368 | |
| 4369 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4370 // |
| 1878 | 4371 // We employ SpinLocks _only for low-contention, fixed-length |
| 4372 // short-duration critical sections where we're concerned | |
| 4373 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4374 // The mux construct provides a spin-then-block mutual exclusion | |
| 4375 // mechanism. | |
| 4376 // | |
| 4377 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4378 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4379 // for the JVM to devolve to yielding with little progress. This is true | |
| 4380 // despite the fact that the critical sections protected by ListLock are | |
| 4381 // extremely short. | |
| 0 | 4382 // |
| 1878 | 4383 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4384 // We should make this a 1st-class type, integrated into the lock | |
| 4385 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4386 // should have sufficient padding to avoid false-sharing and excessive | |
| 4387 // cache-coherency traffic. | |
| 4388 | |
| 4389 | |
| 4390 typedef volatile int SpinLockT ; | |
| 4391 | |
| 4392 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4393 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4394 return ; // normal fast-path return | |
| 4395 } | |
| 4396 | |
| 4397 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4398 TEVENT (SpinAcquire - ctx) ; | |
| 4399 int ctr = 0 ; | |
| 4400 int Yields = 0 ; | |
| 0 | 4401 for (;;) { |
| 1878 | 4402 while (*adr != 0) { |
| 4403 ++ctr ; | |
| 4404 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4405 if (Yields > 5) { | |
| 4406 // Consider using a simple NakedSleep() instead. | |
| 4407 // Then SpinAcquire could be called by non-JVM threads | |
| 4408 Thread::current()->_ParkEvent->park(1) ; | |
| 4409 } else { | |
| 4410 os::NakedYield() ; | |
| 4411 ++Yields ; | |
| 4412 } | |
| 4413 } else { | |
| 4414 SpinPause() ; | |
| 0 | 4415 } |
| 1878 | 4416 } |
| 4417 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4418 } |
| 4419 } | |
| 4420 | |
| 1878 | 4421 void Thread::SpinRelease (volatile int * adr) { |
| 4422 assert (*adr != 0, "invariant") ; | |
| 4423 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4424 // Roach-motel semantics. | |
| 4425 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4426 // but prior LDs and STs within the critical section can't be allowed | |
| 4427 // to reorder or float past the ST that releases the lock. | |
| 4428 *adr = 0 ; | |
| 0 | 4429 } |
| 4430 | |
| 1878 | 4431 // muxAcquire and muxRelease: |
| 4432 // | |
| 4433 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4434 // The LSB of the word is set IFF the lock is held. | |
| 4435 // The remainder of the word points to the head of a singly-linked list | |
| 4436 // of threads blocked on the lock. | |
| 4437 // | |
| 4438 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4439 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4440 // minimizing the peak number of extant ParkEvent instances then | |
| 4441 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4442 // as certain invariants were satisfied. Specifically, care would need | |
| 4443 // to be taken with regards to consuming unpark() "permits". | |
| 4444 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4445 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4446 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4447 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4448 // One way around this would be to widen the restricted-range semaphore | |
| 4449 // implemented in park(). Another alternative would be to provide | |
| 4450 // multiple instances of the PlatformEvent() for each thread. One | |
| 4451 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4452 // | |
| 4453 // * Usage: | |
| 4454 // -- Only as leaf locks | |
| 4455 // -- for short-term locking only as muxAcquire does not perform | |
| 4456 // thread state transitions. | |
| 4457 // | |
| 4458 // Alternatives: | |
| 4459 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4460 // but with parking or spin-then-park instead of pure spinning. | |
| 4461 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4462 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4463 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4464 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4465 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4466 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4467 // boundaries by using placement-new. | |
| 4468 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4469 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4470 // The validity of the backlinks must be ratified before we trust the value. | |
| 4471 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4472 // the forward links, which are always trustworthy. | |
| 4473 // * Add a successor indication. The LockWord is currently encoded as | |
| 4474 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4475 // to provide the usual futile-wakeup optimization. | |
| 4476 // See RTStt for details. | |
| 4477 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4478 // | |
| 4479 | |
| 4480 | |
| 4481 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4482 enum MuxBits { LOCKBIT = 1 } ; | |
| 4483 | |
| 4484 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4485 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4486 if (w == 0) return ; | |
| 4487 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4488 return ; | |
| 4489 } | |
| 4490 | |
| 4491 TEVENT (muxAcquire - Contention) ; | |
| 4492 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4493 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4494 for (;;) { |
| 1878 | 4495 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4496 | |
| 4497 // Optional spin phase: spin-then-park strategy | |
| 4498 while (--its >= 0) { | |
| 4499 w = *Lock ; | |
| 4500 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4501 return ; | |
| 4502 } | |
| 4503 } | |
| 4504 | |
| 4505 Self->reset() ; | |
| 4506 Self->OnList = intptr_t(Lock) ; | |
| 4507 // The following fence() isn't _strictly necessary as the subsequent | |
| 4508 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4509 OrderAccess::fence(); | |
| 4510 for (;;) { | |
| 4511 w = *Lock ; | |
| 4512 if ((w & LOCKBIT) == 0) { | |
| 4513 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4514 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4515 return ; | |
| 4516 } | |
| 4517 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4518 } |
| 1878 | 4519 assert (w & LOCKBIT, "invariant") ; |
| 4520 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4521 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4522 } | |
| 4523 | |
| 4524 while (Self->OnList != 0) { | |
| 4525 Self->park() ; | |
| 4526 } | |
| 0 | 4527 } |
| 4528 } | |
| 4529 | |
| 1878 | 4530 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4531 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4532 if (w == 0) return ; | |
| 4533 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4534 return ; | |
| 4535 } | |
| 4536 | |
| 4537 TEVENT (muxAcquire - Contention) ; | |
| 4538 ParkEvent * ReleaseAfter = NULL ; | |
| 4539 if (ev == NULL) { | |
| 4540 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4541 } | |
| 4542 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4543 for (;;) { | |
| 4544 guarantee (ev->OnList == 0, "invariant") ; | |
| 4545 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4546 | |
| 4547 // Optional spin phase: spin-then-park strategy | |
| 4548 while (--its >= 0) { | |
| 4549 w = *Lock ; | |
| 4550 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4551 if (ReleaseAfter != NULL) { | |
| 4552 ParkEvent::Release (ReleaseAfter) ; | |
| 4553 } | |
| 4554 return ; | |
| 4555 } | |
| 4556 } | |
| 4557 | |
| 4558 ev->reset() ; | |
| 4559 ev->OnList = intptr_t(Lock) ; | |
| 4560 // The following fence() isn't _strictly necessary as the subsequent | |
| 4561 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4562 OrderAccess::fence(); | |
| 4563 for (;;) { | |
| 4564 w = *Lock ; | |
| 4565 if ((w & LOCKBIT) == 0) { | |
| 4566 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4567 ev->OnList = 0 ; | |
| 4568 // We call ::Release while holding the outer lock, thus | |
| 4569 // artificially lengthening the critical section. | |
| 4570 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4571 // after we've dropped the outer lock. | |
| 4572 if (ReleaseAfter != NULL) { | |
| 4573 ParkEvent::Release (ReleaseAfter) ; | |
| 4574 } | |
| 4575 return ; | |
| 4576 } | |
| 4577 continue ; // Interference -- *Lock changed -- Just retry | |
| 4578 } | |
| 4579 assert (w & LOCKBIT, "invariant") ; | |
| 4580 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4581 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4582 } | |
| 4583 | |
| 4584 while (ev->OnList != 0) { | |
| 4585 ev->park() ; | |
| 4586 } | |
| 4587 } | |
| 4588 } | |
| 4589 | |
| 4590 // Release() must extract a successor from the list and then wake that thread. | |
| 4591 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4592 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4593 // Release() would : | |
| 4594 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4595 // (B) Extract a successor from the private list "in-hand" | |
| 4596 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4597 // If there were any newly arrived threads and the CAS() would fail. | |
| 4598 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4599 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4600 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4601 // The wakee would be responsible for reattaching and remerging before it | |
| 4602 // competed for the lock. | |
| 4603 // | |
| 4604 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4605 // multiple concurrent pushers, but only one popper or detacher. | |
| 4606 // This implementation pops from the head of the list. This is unfair, | |
| 4607 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4608 // (We wake recently run threads first). | |
| 4609 | |
| 4610 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4611 for (;;) { | |
| 4612 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4613 assert (w & LOCKBIT, "invariant") ; | |
| 4614 if (w == LOCKBIT) return ; | |
| 4615 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4616 assert (List != NULL, "invariant") ; | |
| 4617 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4618 ParkEvent * nxt = List->ListNext ; | |
| 4619 | |
| 4620 // The following CAS() releases the lock and pops the head element. | |
| 4621 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4622 continue ; | |
| 4623 } | |
| 4624 List->OnList = 0 ; | |
| 4625 OrderAccess::fence() ; | |
| 4626 List->unpark () ; | |
| 4627 return ; | |
| 4628 } | |
| 4629 } | |
| 4630 | |
| 4631 | |
| 0 | 4632 void Threads::verify() { |
| 4633 ALL_JAVA_THREADS(p) { | |
| 4634 p->verify(); | |
| 4635 } | |
| 4636 VMThread* thread = VMThread::vm_thread(); | |
| 4637 if (thread != NULL) thread->verify(); | |
| 4638 } |