src/share/vm/runtime/thread.cpp

Fri, 02 May 2014 06:24:39 +0200

author
anoll
date
Fri, 02 May 2014 06:24:39 +0200
changeset 7310
4356234e712a
parent 7180
46f9331baed5
child 7333
b12a2a9b05ca
permissions
-rw-r--r--

8041992: Fix of JDK-8034775 neglects to account for non-JIT VMs
Summary: Allow 0 compiler threads if no JIT is used.
Reviewed-by: kvn, dholmes
Contributed-by: Severin Gehwolf <sgehwolf@redhat.com>

duke@435 1 /*
drchase@6680 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #include "precompiled.hpp"
stefank@2314 26 #include "classfile/classLoader.hpp"
stefank@2314 27 #include "classfile/javaClasses.hpp"
stefank@2314 28 #include "classfile/systemDictionary.hpp"
stefank@2314 29 #include "classfile/vmSymbols.hpp"
stefank@2314 30 #include "code/scopeDesc.hpp"
stefank@2314 31 #include "compiler/compileBroker.hpp"
stefank@2314 32 #include "interpreter/interpreter.hpp"
stefank@2314 33 #include "interpreter/linkResolver.hpp"
never@2868 34 #include "interpreter/oopMapCache.hpp"
kamg@2446 35 #include "jvmtifiles/jvmtiEnv.hpp"
never@3500 36 #include "memory/gcLocker.inline.hpp"
coleenp@4037 37 #include "memory/metaspaceShared.hpp"
stefank@2314 38 #include "memory/oopFactory.hpp"
stefank@2314 39 #include "memory/universe.inline.hpp"
stefank@2314 40 #include "oops/instanceKlass.hpp"
stefank@2314 41 #include "oops/objArrayOop.hpp"
stefank@2314 42 #include "oops/oop.inline.hpp"
coleenp@2497 43 #include "oops/symbol.hpp"
stefank@2314 44 #include "prims/jvm_misc.hpp"
stefank@2314 45 #include "prims/jvmtiExport.hpp"
stefank@2314 46 #include "prims/jvmtiThreadState.hpp"
stefank@2314 47 #include "prims/privilegedStack.hpp"
stefank@2314 48 #include "runtime/arguments.hpp"
stefank@2314 49 #include "runtime/biasedLocking.hpp"
stefank@2314 50 #include "runtime/deoptimization.hpp"
stefank@2314 51 #include "runtime/fprofiler.hpp"
stefank@2314 52 #include "runtime/frame.inline.hpp"
stefank@2314 53 #include "runtime/init.hpp"
stefank@2314 54 #include "runtime/interfaceSupport.hpp"
stefank@2314 55 #include "runtime/java.hpp"
stefank@2314 56 #include "runtime/javaCalls.hpp"
stefank@2314 57 #include "runtime/jniPeriodicChecker.hpp"
stefank@2314 58 #include "runtime/memprofiler.hpp"
stefank@2314 59 #include "runtime/mutexLocker.hpp"
stefank@2314 60 #include "runtime/objectMonitor.hpp"
goetz@6911 61 #include "runtime/orderAccess.inline.hpp"
stefank@2314 62 #include "runtime/osThread.hpp"
stefank@2314 63 #include "runtime/safepoint.hpp"
stefank@2314 64 #include "runtime/sharedRuntime.hpp"
stefank@2314 65 #include "runtime/statSampler.hpp"
stefank@2314 66 #include "runtime/stubRoutines.hpp"
stefank@2314 67 #include "runtime/task.hpp"
stefank@4299 68 #include "runtime/thread.inline.hpp"
stefank@2314 69 #include "runtime/threadCritical.hpp"
stefank@2314 70 #include "runtime/threadLocalStorage.hpp"
stefank@2314 71 #include "runtime/vframe.hpp"
stefank@2314 72 #include "runtime/vframeArray.hpp"
stefank@2314 73 #include "runtime/vframe_hp.hpp"
stefank@2314 74 #include "runtime/vmThread.hpp"
stefank@2314 75 #include "runtime/vm_operations.hpp"
stefank@2314 76 #include "services/attachListener.hpp"
stefank@2314 77 #include "services/management.hpp"
zgu@3900 78 #include "services/memTracker.hpp"
stefank@2314 79 #include "services/threadService.hpp"
sla@5237 80 #include "trace/tracing.hpp"
sla@5237 81 #include "trace/traceMacros.hpp"
stefank@2314 82 #include "utilities/defaultStream.hpp"
stefank@2314 83 #include "utilities/dtrace.hpp"
stefank@2314 84 #include "utilities/events.hpp"
stefank@2314 85 #include "utilities/preserveException.hpp"
jprovino@4542 86 #include "utilities/macros.hpp"
stefank@2314 87 #ifdef TARGET_OS_FAMILY_linux
stefank@2314 88 # include "os_linux.inline.hpp"
stefank@2314 89 #endif
stefank@2314 90 #ifdef TARGET_OS_FAMILY_solaris
stefank@2314 91 # include "os_solaris.inline.hpp"
stefank@2314 92 #endif
stefank@2314 93 #ifdef TARGET_OS_FAMILY_windows
stefank@2314 94 # include "os_windows.inline.hpp"
stefank@2314 95 #endif
never@3156 96 #ifdef TARGET_OS_FAMILY_bsd
never@3156 97 # include "os_bsd.inline.hpp"
never@3156 98 #endif
jprovino@4542 99 #if INCLUDE_ALL_GCS
stefank@2314 100 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
stefank@2314 101 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp"
stefank@2314 102 #include "gc_implementation/parallelScavenge/pcTasks.hpp"
jprovino@4542 103 #endif // INCLUDE_ALL_GCS
stefank@2314 104 #ifdef COMPILER1
stefank@2314 105 #include "c1/c1_Compiler.hpp"
stefank@2314 106 #endif
stefank@2314 107 #ifdef COMPILER2
stefank@2314 108 #include "opto/c2compiler.hpp"
stefank@2314 109 #include "opto/idealGraphPrinter.hpp"
stefank@2314 110 #endif
kvn@6429 111 #if INCLUDE_RTM_OPT
kvn@6429 112 #include "runtime/rtmLocking.hpp"
kvn@6429 113 #endif
duke@435 114
drchase@6680 115 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
drchase@6680 116
duke@435 117 #ifdef DTRACE_ENABLED
duke@435 118
duke@435 119 // Only bother with this argument setup if dtrace is available
duke@435 120
dcubed@3202 121 #ifndef USDT2
duke@435 122 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin);
duke@435 123 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end);
duke@435 124 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t,
duke@435 125 intptr_t, intptr_t, bool);
duke@435 126 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t,
duke@435 127 intptr_t, intptr_t, bool);
duke@435 128
duke@435 129 #define DTRACE_THREAD_PROBE(probe, javathread) \
duke@435 130 { \
duke@435 131 ResourceMark rm(this); \
duke@435 132 int len = 0; \
duke@435 133 const char* name = (javathread)->get_thread_name(); \
duke@435 134 len = strlen(name); \
duke@435 135 HS_DTRACE_PROBE5(hotspot, thread__##probe, \
duke@435 136 name, len, \
duke@435 137 java_lang_Thread::thread_id((javathread)->threadObj()), \
duke@435 138 (javathread)->osthread()->thread_id(), \
duke@435 139 java_lang_Thread::is_daemon((javathread)->threadObj())); \
duke@435 140 }
duke@435 141
dcubed@3202 142 #else /* USDT2 */
dcubed@3202 143
dcubed@3202 144 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START
dcubed@3202 145 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP
dcubed@3202 146
dcubed@3202 147 #define DTRACE_THREAD_PROBE(probe, javathread) \
dcubed@3202 148 { \
dcubed@3202 149 ResourceMark rm(this); \
dcubed@3202 150 int len = 0; \
dcubed@3202 151 const char* name = (javathread)->get_thread_name(); \
dcubed@3202 152 len = strlen(name); \
dcubed@3202 153 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \
dcubed@3202 154 (char *) name, len, \
dcubed@3202 155 java_lang_Thread::thread_id((javathread)->threadObj()), \
dcubed@3202 156 (uintptr_t) (javathread)->osthread()->thread_id(), \
dcubed@3202 157 java_lang_Thread::is_daemon((javathread)->threadObj())); \
dcubed@3202 158 }
dcubed@3202 159
dcubed@3202 160 #endif /* USDT2 */
dcubed@3202 161
duke@435 162 #else // ndef DTRACE_ENABLED
duke@435 163
duke@435 164 #define DTRACE_THREAD_PROBE(probe, javathread)
duke@435 165
duke@435 166 #endif // ndef DTRACE_ENABLED
duke@435 167
zgu@3900 168
duke@435 169 // Class hierarchy
duke@435 170 // - Thread
duke@435 171 // - VMThread
duke@435 172 // - WatcherThread
duke@435 173 // - ConcurrentMarkSweepThread
duke@435 174 // - JavaThread
duke@435 175 // - CompilerThread
duke@435 176
duke@435 177 // ======= Thread ========
duke@435 178 // Support for forcing alignment of thread objects for biased locking
zgu@3900 179 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) {
duke@435 180 if (UseBiasedLocking) {
duke@435 181 const int alignment = markOopDesc::biased_lock_alignment;
duke@435 182 size_t aligned_size = size + (alignment - sizeof(intptr_t));
zgu@3900 183 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC)
nloodin@4183 184 : AllocateHeap(aligned_size, flags, CURRENT_PC,
nloodin@4183 185 AllocFailStrategy::RETURN_NULL);
duke@435 186 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment);
duke@435 187 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <=
duke@435 188 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size),
duke@435 189 "JavaThread alignment code overflowed allocated storage");
duke@435 190 if (TraceBiasedLocking) {
duke@435 191 if (aligned_addr != real_malloc_addr)
duke@435 192 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT,
duke@435 193 real_malloc_addr, aligned_addr);
duke@435 194 }
duke@435 195 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr;
duke@435 196 return aligned_addr;
duke@435 197 } else {
zgu@3900 198 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC)
nloodin@4183 199 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL);
duke@435 200 }
duke@435 201 }
duke@435 202
duke@435 203 void Thread::operator delete(void* p) {
duke@435 204 if (UseBiasedLocking) {
duke@435 205 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address;
zgu@3900 206 FreeHeap(real_malloc_addr, mtThread);
duke@435 207 } else {
zgu@3900 208 FreeHeap(p, mtThread);
duke@435 209 }
duke@435 210 }
duke@435 211
duke@435 212
duke@435 213 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread,
duke@435 214 // JavaThread
duke@435 215
duke@435 216
duke@435 217 Thread::Thread() {
phh@2423 218 // stack and get_thread
phh@2423 219 set_stack_base(NULL);
phh@2423 220 set_stack_size(0);
phh@2423 221 set_self_raw_id(0);
phh@2423 222 set_lgrp_id(-1);
duke@435 223
duke@435 224 // allocated data structures
phh@2423 225 set_osthread(NULL);
zgu@3900 226 set_resource_area(new (mtThread)ResourceArea());
fparain@5409 227 DEBUG_ONLY(_current_resource_mark = NULL;)
zgu@3900 228 set_handle_area(new (mtThread) HandleArea(NULL));
iklam@5300 229 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true));
duke@435 230 set_active_handles(NULL);
duke@435 231 set_free_handle_block(NULL);
duke@435 232 set_last_handle_mark(NULL);
duke@435 233
duke@435 234 // This initial value ==> never claimed.
duke@435 235 _oops_do_parity = 0;
duke@435 236
duke@435 237 // the handle mark links itself to last_handle_mark
dcubed@4967 238 new HandleMark(this);
dcubed@4967 239
duke@435 240 // plain initialization
duke@435 241 debug_only(_owned_locks = NULL;)
duke@435 242 debug_only(_allow_allocation_count = 0;)
duke@435 243 NOT_PRODUCT(_allow_safepoint_count = 0;)
ysr@1241 244 NOT_PRODUCT(_skip_gcalot = false;)
duke@435 245 _jvmti_env_iteration_count = 0;
phh@2423 246 set_allocated_bytes(0);
duke@435 247 _vm_operation_started_count = 0;
duke@435 248 _vm_operation_completed_count = 0;
duke@435 249 _current_pending_monitor = NULL;
duke@435 250 _current_pending_monitor_is_from_java = true;
duke@435 251 _current_waiting_monitor = NULL;
duke@435 252 _num_nested_signal = 0;
duke@435 253 omFreeList = NULL ;
duke@435 254 omFreeCount = 0 ;
duke@435 255 omFreeProvision = 32 ;
acorn@1942 256 omInUseList = NULL ;
acorn@1942 257 omInUseCount = 0 ;
duke@435 258
never@3632 259 #ifdef ASSERT
never@3632 260 _visited_for_critical_count = false;
never@3632 261 #endif
never@3632 262
duke@435 263 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true);
duke@435 264 _suspend_flags = 0;
duke@435 265
duke@435 266 // thread-specific hashCode stream generator state - Marsaglia shift-xor form
duke@435 267 _hashStateX = os::random() ;
duke@435 268 _hashStateY = 842502087 ;
duke@435 269 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ;
duke@435 270 _hashStateW = 273326509 ;
duke@435 271
duke@435 272 _OnTrap = 0 ;
duke@435 273 _schedctl = NULL ;
duke@435 274 _Stalled = 0 ;
duke@435 275 _TypeTag = 0x2BAD ;
duke@435 276
duke@435 277 // Many of the following fields are effectively final - immutable
duke@435 278 // Note that nascent threads can't use the Native Monitor-Mutex
duke@435 279 // construct until the _MutexEvent is initialized ...
duke@435 280 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents
duke@435 281 // we might instead use a stack of ParkEvents that we could provision on-demand.
duke@435 282 // The stack would act as a cache to avoid calls to ParkEvent::Allocate()
duke@435 283 // and ::Release()
duke@435 284 _ParkEvent = ParkEvent::Allocate (this) ;
duke@435 285 _SleepEvent = ParkEvent::Allocate (this) ;
duke@435 286 _MutexEvent = ParkEvent::Allocate (this) ;
duke@435 287 _MuxEvent = ParkEvent::Allocate (this) ;
duke@435 288
duke@435 289 #ifdef CHECK_UNHANDLED_OOPS
duke@435 290 if (CheckUnhandledOops) {
duke@435 291 _unhandled_oops = new UnhandledOops(this);
duke@435 292 }
duke@435 293 #endif // CHECK_UNHANDLED_OOPS
duke@435 294 #ifdef ASSERT
duke@435 295 if (UseBiasedLocking) {
duke@435 296 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed");
duke@435 297 assert(this == _real_malloc_address ||
duke@435 298 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment),
duke@435 299 "bug in forced alignment of thread objects");
duke@435 300 }
duke@435 301 #endif /* ASSERT */
duke@435 302 }
duke@435 303
duke@435 304 void Thread::initialize_thread_local_storage() {
duke@435 305 // Note: Make sure this method only calls
duke@435 306 // non-blocking operations. Otherwise, it might not work
duke@435 307 // with the thread-startup/safepoint interaction.
duke@435 308
duke@435 309 // During Java thread startup, safepoint code should allow this
duke@435 310 // method to complete because it may need to allocate memory to
duke@435 311 // store information for the new thread.
duke@435 312
duke@435 313 // initialize structure dependent on thread local storage
duke@435 314 ThreadLocalStorage::set_thread(this);
duke@435 315 }
duke@435 316
duke@435 317 void Thread::record_stack_base_and_size() {
duke@435 318 set_stack_base(os::current_stack_base());
duke@435 319 set_stack_size(os::current_stack_size());
goetz@6444 320 if (is_Java_thread()) {
goetz@6444 321 ((JavaThread*) this)->set_stack_overflow_limit();
goetz@6444 322 }
zgu@4079 323 // CR 7190089: on Solaris, primordial thread's stack is adjusted
zgu@4079 324 // in initialize_thread(). Without the adjustment, stack size is
zgu@4079 325 // incorrect if stack is set to unlimited (ulimit -s unlimited).
zgu@4079 326 // So far, only Solaris has real implementation of initialize_thread().
zgu@4079 327 //
zgu@4079 328 // set up any platform-specific state.
zgu@4079 329 os::initialize_thread(this);
zgu@4079 330
jprovino@4165 331 #if INCLUDE_NMT
zgu@4193 332 // record thread's native stack, stack grows downward
zgu@4193 333 address stack_low_addr = stack_base() - stack_size();
zgu@7074 334 MemTracker::record_thread_stack(stack_low_addr, stack_size());
jprovino@4165 335 #endif // INCLUDE_NMT
duke@435 336 }
duke@435 337
duke@435 338
duke@435 339 Thread::~Thread() {
duke@435 340 // Reclaim the objectmonitors from the omFreeList of the moribund thread.
duke@435 341 ObjectSynchronizer::omFlush (this) ;
duke@435 342
mgronlun@5673 343 EVENT_THREAD_DESTRUCT(this);
mgronlun@5673 344
zgu@4057 345 // stack_base can be NULL if the thread is never started or exited before
zgu@4057 346 // record_stack_base_and_size called. Although, we would like to ensure
zgu@4057 347 // that all started threads do call record_stack_base_and_size(), there is
zgu@4057 348 // not proper way to enforce that.
jprovino@4165 349 #if INCLUDE_NMT
zgu@4057 350 if (_stack_base != NULL) {
zgu@4057 351 address low_stack_addr = stack_base() - stack_size();
zgu@7074 352 MemTracker::release_thread_stack(low_stack_addr, stack_size());
zgu@4193 353 #ifdef ASSERT
zgu@4193 354 set_stack_base(NULL);
zgu@4193 355 #endif
zgu@4057 356 }
jprovino@4165 357 #endif // INCLUDE_NMT
zgu@3900 358
duke@435 359 // deallocate data structures
duke@435 360 delete resource_area();
duke@435 361 // since the handle marks are using the handle area, we have to deallocated the root
duke@435 362 // handle mark before deallocating the thread's handle area,
duke@435 363 assert(last_handle_mark() != NULL, "check we have an element");
dcubed@4967 364 delete last_handle_mark();
dcubed@4967 365 assert(last_handle_mark() == NULL, "check we have reached the end");
duke@435 366
duke@435 367 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads.
duke@435 368 // We NULL out the fields for good hygiene.
duke@435 369 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ;
duke@435 370 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ;
duke@435 371 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ;
duke@435 372 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ;
duke@435 373
duke@435 374 delete handle_area();
coleenp@4037 375 delete metadata_handles();
duke@435 376
duke@435 377 // osthread() can be NULL, if creation of thread failed.
duke@435 378 if (osthread() != NULL) os::free_thread(osthread());
duke@435 379
duke@435 380 delete _SR_lock;
duke@435 381
duke@435 382 // clear thread local storage if the Thread is deleting itself
duke@435 383 if (this == Thread::current()) {
duke@435 384 ThreadLocalStorage::set_thread(NULL);
duke@435 385 } else {
duke@435 386 // In the case where we're not the current thread, invalidate all the
duke@435 387 // caches in case some code tries to get the current thread or the
duke@435 388 // thread that was destroyed, and gets stale information.
duke@435 389 ThreadLocalStorage::invalidate_all();
duke@435 390 }
duke@435 391 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();)
duke@435 392 }
duke@435 393
duke@435 394 // NOTE: dummy function for assertion purpose.
duke@435 395 void Thread::run() {
duke@435 396 ShouldNotReachHere();
duke@435 397 }
duke@435 398
duke@435 399 #ifdef ASSERT
duke@435 400 // Private method to check for dangling thread pointer
duke@435 401 void check_for_dangling_thread_pointer(Thread *thread) {
duke@435 402 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
duke@435 403 "possibility of dangling Thread pointer");
duke@435 404 }
duke@435 405 #endif
duke@435 406
duke@435 407
duke@435 408 #ifndef PRODUCT
duke@435 409 // Tracing method for basic thread operations
duke@435 410 void Thread::trace(const char* msg, const Thread* const thread) {
duke@435 411 if (!TraceThreadEvents) return;
duke@435 412 ResourceMark rm;
duke@435 413 ThreadCritical tc;
duke@435 414 const char *name = "non-Java thread";
duke@435 415 int prio = -1;
duke@435 416 if (thread->is_Java_thread()
duke@435 417 && !thread->is_Compiler_thread()) {
duke@435 418 // The Threads_lock must be held to get information about
duke@435 419 // this thread but may not be in some situations when
duke@435 420 // tracing thread events.
duke@435 421 bool release_Threads_lock = false;
duke@435 422 if (!Threads_lock->owned_by_self()) {
duke@435 423 Threads_lock->lock();
duke@435 424 release_Threads_lock = true;
duke@435 425 }
duke@435 426 JavaThread* jt = (JavaThread *)thread;
duke@435 427 name = (char *)jt->get_thread_name();
duke@435 428 oop thread_oop = jt->threadObj();
duke@435 429 if (thread_oop != NULL) {
duke@435 430 prio = java_lang_Thread::priority(thread_oop);
duke@435 431 }
duke@435 432 if (release_Threads_lock) {
duke@435 433 Threads_lock->unlock();
duke@435 434 }
duke@435 435 }
duke@435 436 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio);
duke@435 437 }
duke@435 438 #endif
duke@435 439
duke@435 440
duke@435 441 ThreadPriority Thread::get_priority(const Thread* const thread) {
duke@435 442 trace("get priority", thread);
duke@435 443 ThreadPriority priority;
duke@435 444 // Can return an error!
duke@435 445 (void)os::get_priority(thread, priority);
duke@435 446 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found");
duke@435 447 return priority;
duke@435 448 }
duke@435 449
duke@435 450 void Thread::set_priority(Thread* thread, ThreadPriority priority) {
duke@435 451 trace("set priority", thread);
duke@435 452 debug_only(check_for_dangling_thread_pointer(thread);)
duke@435 453 // Can return an error!
duke@435 454 (void)os::set_priority(thread, priority);
duke@435 455 }
duke@435 456
duke@435 457
duke@435 458 void Thread::start(Thread* thread) {
duke@435 459 trace("start", thread);
duke@435 460 // Start is different from resume in that its safety is guaranteed by context or
duke@435 461 // being called from a Java method synchronized on the Thread object.
duke@435 462 if (!DisableStartThread) {
duke@435 463 if (thread->is_Java_thread()) {
duke@435 464 // Initialize the thread state to RUNNABLE before starting this thread.
duke@435 465 // Can not set it after the thread started because we do not know the
duke@435 466 // exact thread state at that time. It could be in MONITOR_WAIT or
duke@435 467 // in SLEEPING or some other state.
duke@435 468 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(),
duke@435 469 java_lang_Thread::RUNNABLE);
duke@435 470 }
duke@435 471 os::start_thread(thread);
duke@435 472 }
duke@435 473 }
duke@435 474
duke@435 475 // Enqueue a VM_Operation to do the job for us - sometime later
duke@435 476 void Thread::send_async_exception(oop java_thread, oop java_throwable) {
duke@435 477 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable);
duke@435 478 VMThread::execute(vm_stop);
duke@435 479 }
duke@435 480
duke@435 481
duke@435 482 //
duke@435 483 // Check if an external suspend request has completed (or has been
duke@435 484 // cancelled). Returns true if the thread is externally suspended and
duke@435 485 // false otherwise.
duke@435 486 //
duke@435 487 // The bits parameter returns information about the code path through
duke@435 488 // the routine. Useful for debugging:
duke@435 489 //
duke@435 490 // set in is_ext_suspend_completed():
duke@435 491 // 0x00000001 - routine was entered
duke@435 492 // 0x00000010 - routine return false at end
duke@435 493 // 0x00000100 - thread exited (return false)
duke@435 494 // 0x00000200 - suspend request cancelled (return false)
duke@435 495 // 0x00000400 - thread suspended (return true)
duke@435 496 // 0x00001000 - thread is in a suspend equivalent state (return true)
duke@435 497 // 0x00002000 - thread is native and walkable (return true)
duke@435 498 // 0x00004000 - thread is native_trans and walkable (needed retry)
duke@435 499 //
duke@435 500 // set in wait_for_ext_suspend_completion():
duke@435 501 // 0x00010000 - routine was entered
duke@435 502 // 0x00020000 - suspend request cancelled before loop (return false)
duke@435 503 // 0x00040000 - thread suspended before loop (return true)
duke@435 504 // 0x00080000 - suspend request cancelled in loop (return false)
duke@435 505 // 0x00100000 - thread suspended in loop (return true)
duke@435 506 // 0x00200000 - suspend not completed during retry loop (return false)
duke@435 507 //
duke@435 508
duke@435 509 // Helper class for tracing suspend wait debug bits.
duke@435 510 //
duke@435 511 // 0x00000100 indicates that the target thread exited before it could
duke@435 512 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and
duke@435 513 // 0x00080000 each indicate a cancelled suspend request so they don't
duke@435 514 // count as wait failures either.
duke@435 515 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000)
duke@435 516
duke@435 517 class TraceSuspendDebugBits : public StackObj {
duke@435 518 private:
duke@435 519 JavaThread * jt;
duke@435 520 bool is_wait;
duke@435 521 bool called_by_wait; // meaningful when !is_wait
duke@435 522 uint32_t * bits;
duke@435 523
duke@435 524 public:
duke@435 525 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait,
duke@435 526 uint32_t *_bits) {
duke@435 527 jt = _jt;
duke@435 528 is_wait = _is_wait;
duke@435 529 called_by_wait = _called_by_wait;
duke@435 530 bits = _bits;
duke@435 531 }
duke@435 532
duke@435 533 ~TraceSuspendDebugBits() {
duke@435 534 if (!is_wait) {
duke@435 535 #if 1
duke@435 536 // By default, don't trace bits for is_ext_suspend_completed() calls.
duke@435 537 // That trace is very chatty.
duke@435 538 return;
duke@435 539 #else
duke@435 540 if (!called_by_wait) {
duke@435 541 // If tracing for is_ext_suspend_completed() is enabled, then only
duke@435 542 // trace calls to it from wait_for_ext_suspend_completion()
duke@435 543 return;
duke@435 544 }
duke@435 545 #endif
duke@435 546 }
duke@435 547
duke@435 548 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) {
duke@435 549 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) {
duke@435 550 MutexLocker ml(Threads_lock); // needed for get_thread_name()
duke@435 551 ResourceMark rm;
duke@435 552
duke@435 553 tty->print_cr(
duke@435 554 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)",
duke@435 555 jt->get_thread_name(), *bits);
duke@435 556
duke@435 557 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed");
duke@435 558 }
duke@435 559 }
duke@435 560 }
duke@435 561 };
duke@435 562 #undef DEBUG_FALSE_BITS
duke@435 563
duke@435 564
duke@435 565 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) {
duke@435 566 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits);
duke@435 567
duke@435 568 bool did_trans_retry = false; // only do thread_in_native_trans retry once
duke@435 569 bool do_trans_retry; // flag to force the retry
duke@435 570
duke@435 571 *bits |= 0x00000001;
duke@435 572
duke@435 573 do {
duke@435 574 do_trans_retry = false;
duke@435 575
duke@435 576 if (is_exiting()) {
duke@435 577 // Thread is in the process of exiting. This is always checked
duke@435 578 // first to reduce the risk of dereferencing a freed JavaThread.
duke@435 579 *bits |= 0x00000100;
duke@435 580 return false;
duke@435 581 }
duke@435 582
duke@435 583 if (!is_external_suspend()) {
duke@435 584 // Suspend request is cancelled. This is always checked before
duke@435 585 // is_ext_suspended() to reduce the risk of a rogue resume
duke@435 586 // confusing the thread that made the suspend request.
duke@435 587 *bits |= 0x00000200;
duke@435 588 return false;
duke@435 589 }
duke@435 590
duke@435 591 if (is_ext_suspended()) {
duke@435 592 // thread is suspended
duke@435 593 *bits |= 0x00000400;
duke@435 594 return true;
duke@435 595 }
duke@435 596
duke@435 597 // Now that we no longer do hard suspends of threads running
duke@435 598 // native code, the target thread can be changing thread state
duke@435 599 // while we are in this routine:
duke@435 600 //
duke@435 601 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked
duke@435 602 //
duke@435 603 // We save a copy of the thread state as observed at this moment
duke@435 604 // and make our decision about suspend completeness based on the
duke@435 605 // copy. This closes the race where the thread state is seen as
duke@435 606 // _thread_in_native_trans in the if-thread_blocked check, but is
duke@435 607 // seen as _thread_blocked in if-thread_in_native_trans check.
duke@435 608 JavaThreadState save_state = thread_state();
duke@435 609
duke@435 610 if (save_state == _thread_blocked && is_suspend_equivalent()) {
duke@435 611 // If the thread's state is _thread_blocked and this blocking
duke@435 612 // condition is known to be equivalent to a suspend, then we can
duke@435 613 // consider the thread to be externally suspended. This means that
duke@435 614 // the code that sets _thread_blocked has been modified to do
duke@435 615 // self-suspension if the blocking condition releases. We also
duke@435 616 // used to check for CONDVAR_WAIT here, but that is now covered by
duke@435 617 // the _thread_blocked with self-suspension check.
duke@435 618 //
duke@435 619 // Return true since we wouldn't be here unless there was still an
duke@435 620 // external suspend request.
duke@435 621 *bits |= 0x00001000;
duke@435 622 return true;
duke@435 623 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) {
duke@435 624 // Threads running native code will self-suspend on native==>VM/Java
duke@435 625 // transitions. If its stack is walkable (should always be the case
duke@435 626 // unless this function is called before the actual java_suspend()
duke@435 627 // call), then the wait is done.
duke@435 628 *bits |= 0x00002000;
duke@435 629 return true;
duke@435 630 } else if (!called_by_wait && !did_trans_retry &&
duke@435 631 save_state == _thread_in_native_trans &&
duke@435 632 frame_anchor()->walkable()) {
duke@435 633 // The thread is transitioning from thread_in_native to another
duke@435 634 // thread state. check_safepoint_and_suspend_for_native_trans()
duke@435 635 // will force the thread to self-suspend. If it hasn't gotten
duke@435 636 // there yet we may have caught the thread in-between the native
duke@435 637 // code check above and the self-suspend. Lucky us. If we were
duke@435 638 // called by wait_for_ext_suspend_completion(), then it
duke@435 639 // will be doing the retries so we don't have to.
duke@435 640 //
duke@435 641 // Since we use the saved thread state in the if-statement above,
duke@435 642 // there is a chance that the thread has already transitioned to
duke@435 643 // _thread_blocked by the time we get here. In that case, we will
duke@435 644 // make a single unnecessary pass through the logic below. This
duke@435 645 // doesn't hurt anything since we still do the trans retry.
duke@435 646
duke@435 647 *bits |= 0x00004000;
duke@435 648
duke@435 649 // Once the thread leaves thread_in_native_trans for another
duke@435 650 // thread state, we break out of this retry loop. We shouldn't
duke@435 651 // need this flag to prevent us from getting back here, but
duke@435 652 // sometimes paranoia is good.
duke@435 653 did_trans_retry = true;
duke@435 654
duke@435 655 // We wait for the thread to transition to a more usable state.
duke@435 656 for (int i = 1; i <= SuspendRetryCount; i++) {
duke@435 657 // We used to do an "os::yield_all(i)" call here with the intention
duke@435 658 // that yielding would increase on each retry. However, the parameter
duke@435 659 // is ignored on Linux which means the yield didn't scale up. Waiting
duke@435 660 // on the SR_lock below provides a much more predictable scale up for
duke@435 661 // the delay. It also provides a simple/direct point to check for any
duke@435 662 // safepoint requests from the VMThread
duke@435 663
duke@435 664 // temporarily drops SR_lock while doing wait with safepoint check
duke@435 665 // (if we're a JavaThread - the WatcherThread can also call this)
duke@435 666 // and increase delay with each retry
duke@435 667 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
duke@435 668
duke@435 669 // check the actual thread state instead of what we saved above
duke@435 670 if (thread_state() != _thread_in_native_trans) {
duke@435 671 // the thread has transitioned to another thread state so
duke@435 672 // try all the checks (except this one) one more time.
duke@435 673 do_trans_retry = true;
duke@435 674 break;
duke@435 675 }
duke@435 676 } // end retry loop
duke@435 677
duke@435 678
duke@435 679 }
duke@435 680 } while (do_trans_retry);
duke@435 681
duke@435 682 *bits |= 0x00000010;
duke@435 683 return false;
duke@435 684 }
duke@435 685
duke@435 686 //
duke@435 687 // Wait for an external suspend request to complete (or be cancelled).
duke@435 688 // Returns true if the thread is externally suspended and false otherwise.
duke@435 689 //
duke@435 690 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay,
duke@435 691 uint32_t *bits) {
duke@435 692 TraceSuspendDebugBits tsdb(this, true /* is_wait */,
duke@435 693 false /* !called_by_wait */, bits);
duke@435 694
duke@435 695 // local flag copies to minimize SR_lock hold time
duke@435 696 bool is_suspended;
duke@435 697 bool pending;
duke@435 698 uint32_t reset_bits;
duke@435 699
duke@435 700 // set a marker so is_ext_suspend_completed() knows we are the caller
duke@435 701 *bits |= 0x00010000;
duke@435 702
duke@435 703 // We use reset_bits to reinitialize the bits value at the top of
duke@435 704 // each retry loop. This allows the caller to make use of any
duke@435 705 // unused bits for their own marking purposes.
duke@435 706 reset_bits = *bits;
duke@435 707
duke@435 708 {
duke@435 709 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
duke@435 710 is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
duke@435 711 delay, bits);
duke@435 712 pending = is_external_suspend();
duke@435 713 }
duke@435 714 // must release SR_lock to allow suspension to complete
duke@435 715
duke@435 716 if (!pending) {
duke@435 717 // A cancelled suspend request is the only false return from
duke@435 718 // is_ext_suspend_completed() that keeps us from entering the
duke@435 719 // retry loop.
duke@435 720 *bits |= 0x00020000;
duke@435 721 return false;
duke@435 722 }
duke@435 723
duke@435 724 if (is_suspended) {
duke@435 725 *bits |= 0x00040000;
duke@435 726 return true;
duke@435 727 }
duke@435 728
duke@435 729 for (int i = 1; i <= retries; i++) {
duke@435 730 *bits = reset_bits; // reinit to only track last retry
duke@435 731
duke@435 732 // We used to do an "os::yield_all(i)" call here with the intention
duke@435 733 // that yielding would increase on each retry. However, the parameter
duke@435 734 // is ignored on Linux which means the yield didn't scale up. Waiting
duke@435 735 // on the SR_lock below provides a much more predictable scale up for
duke@435 736 // the delay. It also provides a simple/direct point to check for any
duke@435 737 // safepoint requests from the VMThread
duke@435 738
duke@435 739 {
duke@435 740 MutexLocker ml(SR_lock());
duke@435 741 // wait with safepoint check (if we're a JavaThread - the WatcherThread
duke@435 742 // can also call this) and increase delay with each retry
duke@435 743 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
duke@435 744
duke@435 745 is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
duke@435 746 delay, bits);
duke@435 747
duke@435 748 // It is possible for the external suspend request to be cancelled
duke@435 749 // (by a resume) before the actual suspend operation is completed.
duke@435 750 // Refresh our local copy to see if we still need to wait.
duke@435 751 pending = is_external_suspend();
duke@435 752 }
duke@435 753
duke@435 754 if (!pending) {
duke@435 755 // A cancelled suspend request is the only false return from
duke@435 756 // is_ext_suspend_completed() that keeps us from staying in the
duke@435 757 // retry loop.
duke@435 758 *bits |= 0x00080000;
duke@435 759 return false;
duke@435 760 }
duke@435 761
duke@435 762 if (is_suspended) {
duke@435 763 *bits |= 0x00100000;
duke@435 764 return true;
duke@435 765 }
duke@435 766 } // end retry loop
duke@435 767
duke@435 768 // thread did not suspend after all our retries
duke@435 769 *bits |= 0x00200000;
duke@435 770 return false;
duke@435 771 }
duke@435 772
duke@435 773 #ifndef PRODUCT
duke@435 774 void JavaThread::record_jump(address target, address instr, const char* file, int line) {
duke@435 775
duke@435 776 // This should not need to be atomic as the only way for simultaneous
duke@435 777 // updates is via interrupts. Even then this should be rare or non-existant
duke@435 778 // and we don't care that much anyway.
duke@435 779
duke@435 780 int index = _jmp_ring_index;
duke@435 781 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1);
duke@435 782 _jmp_ring[index]._target = (intptr_t) target;
duke@435 783 _jmp_ring[index]._instruction = (intptr_t) instr;
duke@435 784 _jmp_ring[index]._file = file;
duke@435 785 _jmp_ring[index]._line = line;
duke@435 786 }
duke@435 787 #endif /* PRODUCT */
duke@435 788
duke@435 789 // Called by flat profiler
duke@435 790 // Callers have already called wait_for_ext_suspend_completion
duke@435 791 // The assertion for that is currently too complex to put here:
duke@435 792 bool JavaThread::profile_last_Java_frame(frame* _fr) {
duke@435 793 bool gotframe = false;
duke@435 794 // self suspension saves needed state.
duke@435 795 if (has_last_Java_frame() && _anchor.walkable()) {
duke@435 796 *_fr = pd_last_frame();
duke@435 797 gotframe = true;
duke@435 798 }
duke@435 799 return gotframe;
duke@435 800 }
duke@435 801
duke@435 802 void Thread::interrupt(Thread* thread) {
duke@435 803 trace("interrupt", thread);
duke@435 804 debug_only(check_for_dangling_thread_pointer(thread);)
duke@435 805 os::interrupt(thread);
duke@435 806 }
duke@435 807
duke@435 808 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) {
duke@435 809 trace("is_interrupted", thread);
duke@435 810 debug_only(check_for_dangling_thread_pointer(thread);)
duke@435 811 // Note: If clear_interrupted==false, this simply fetches and
duke@435 812 // returns the value of the field osthread()->interrupted().
duke@435 813 return os::is_interrupted(thread, clear_interrupted);
duke@435 814 }
duke@435 815
duke@435 816
duke@435 817 // GC Support
duke@435 818 bool Thread::claim_oops_do_par_case(int strong_roots_parity) {
duke@435 819 jint thread_parity = _oops_do_parity;
duke@435 820 if (thread_parity != strong_roots_parity) {
duke@435 821 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity);
johnc@3175 822 if (res == thread_parity) {
johnc@3175 823 return true;
johnc@3175 824 } else {
duke@435 825 guarantee(res == strong_roots_parity, "Or else what?");
jmasa@3294 826 assert(SharedHeap::heap()->workers()->active_workers() > 0,
jmasa@3294 827 "Should only fail when parallel.");
duke@435 828 return false;
duke@435 829 }
duke@435 830 }
jmasa@3294 831 assert(SharedHeap::heap()->workers()->active_workers() > 0,
duke@435 832 "Should only fail when parallel.");
duke@435 833 return false;
duke@435 834 }
duke@435 835
stefank@6973 836 void Thread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) {
duke@435 837 active_handles()->oops_do(f);
duke@435 838 // Do oop for ThreadShadow
duke@435 839 f->do_oop((oop*)&_pending_exception);
duke@435 840 handle_area()->oops_do(f);
duke@435 841 }
duke@435 842
jrose@1424 843 void Thread::nmethods_do(CodeBlobClosure* cf) {
jrose@1424 844 // no nmethods in a generic thread...
duke@435 845 }
duke@435 846
coleenp@4037 847 void Thread::metadata_do(void f(Metadata*)) {
coleenp@4037 848 if (metadata_handles() != NULL) {
coleenp@4037 849 for (int i = 0; i< metadata_handles()->length(); i++) {
coleenp@4037 850 f(metadata_handles()->at(i));
coleenp@4037 851 }
coleenp@4037 852 }
coleenp@4037 853 }
coleenp@4037 854
duke@435 855 void Thread::print_on(outputStream* st) const {
duke@435 856 // get_priority assumes osthread initialized
duke@435 857 if (osthread() != NULL) {
dholmes@4077 858 int os_prio;
dholmes@4077 859 if (os::get_native_priority(this, &os_prio) == OS_OK) {
dholmes@4077 860 st->print("os_prio=%d ", os_prio);
dholmes@4077 861 }
dholmes@4077 862 st->print("tid=" INTPTR_FORMAT " ", this);
sla@7107 863 ext().print_on(st);
duke@435 864 osthread()->print_on(st);
duke@435 865 }
duke@435 866 debug_only(if (WizardMode) print_owned_locks_on(st);)
duke@435 867 }
duke@435 868
duke@435 869 // Thread::print_on_error() is called by fatal error handler. Don't use
duke@435 870 // any lock or allocate memory.
duke@435 871 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const {
duke@435 872 if (is_VM_thread()) st->print("VMThread");
duke@435 873 else if (is_Compiler_thread()) st->print("CompilerThread");
duke@435 874 else if (is_Java_thread()) st->print("JavaThread");
duke@435 875 else if (is_GC_task_thread()) st->print("GCTaskThread");
duke@435 876 else if (is_Watcher_thread()) st->print("WatcherThread");
duke@435 877 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread");
duke@435 878 else st->print("Thread");
duke@435 879
duke@435 880 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]",
duke@435 881 _stack_base - _stack_size, _stack_base);
duke@435 882
duke@435 883 if (osthread()) {
duke@435 884 st->print(" [id=%d]", osthread()->thread_id());
duke@435 885 }
duke@435 886 }
duke@435 887
duke@435 888 #ifdef ASSERT
duke@435 889 void Thread::print_owned_locks_on(outputStream* st) const {
duke@435 890 Monitor *cur = _owned_locks;
duke@435 891 if (cur == NULL) {
duke@435 892 st->print(" (no locks) ");
duke@435 893 } else {
duke@435 894 st->print_cr(" Locks owned:");
duke@435 895 while(cur) {
duke@435 896 cur->print_on(st);
duke@435 897 cur = cur->next();
duke@435 898 }
duke@435 899 }
duke@435 900 }
duke@435 901
duke@435 902 static int ref_use_count = 0;
duke@435 903
duke@435 904 bool Thread::owns_locks_but_compiled_lock() const {
duke@435 905 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
duke@435 906 if (cur != Compile_lock) return true;
duke@435 907 }
duke@435 908 return false;
duke@435 909 }
duke@435 910
duke@435 911
duke@435 912 #endif
duke@435 913
duke@435 914 #ifndef PRODUCT
duke@435 915
duke@435 916 // The flag: potential_vm_operation notifies if this particular safepoint state could potential
duke@435 917 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that
duke@435 918 // no threads which allow_vm_block's are held
duke@435 919 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) {
duke@435 920 // Check if current thread is allowed to block at a safepoint
duke@435 921 if (!(_allow_safepoint_count == 0))
duke@435 922 fatal("Possible safepoint reached by thread that does not allow it");
duke@435 923 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) {
duke@435 924 fatal("LEAF method calling lock?");
duke@435 925 }
duke@435 926
duke@435 927 #ifdef ASSERT
duke@435 928 if (potential_vm_operation && is_Java_thread()
duke@435 929 && !Universe::is_bootstrapping()) {
duke@435 930 // Make sure we do not hold any locks that the VM thread also uses.
duke@435 931 // This could potentially lead to deadlocks
duke@435 932 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
duke@435 933 // Threads_lock is special, since the safepoint synchronization will not start before this is
duke@435 934 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock,
duke@435 935 // since it is used to transfer control between JavaThreads and the VMThread
duke@435 936 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first!
duke@435 937 if ( (cur->allow_vm_block() &&
duke@435 938 cur != Threads_lock &&
duke@435 939 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation
duke@435 940 cur != VMOperationRequest_lock &&
duke@435 941 cur != VMOperationQueue_lock) ||
duke@435 942 cur->rank() == Mutex::special) {
vlivanov@7180 943 fatal(err_msg("Thread holding lock at safepoint that vm can block on: %s", cur->name()));
duke@435 944 }
duke@435 945 }
duke@435 946 }
duke@435 947
duke@435 948 if (GCALotAtAllSafepoints) {
duke@435 949 // We could enter a safepoint here and thus have a gc
duke@435 950 InterfaceSupport::check_gc_alot();
duke@435 951 }
duke@435 952 #endif
duke@435 953 }
duke@435 954 #endif
duke@435 955
duke@435 956 bool Thread::is_in_stack(address adr) const {
duke@435 957 assert(Thread::current() == this, "is_in_stack can only be called from current thread");
duke@435 958 address end = os::current_stack_pointer();
coleenp@4037 959 // Allow non Java threads to call this without stack_base
coleenp@4037 960 if (_stack_base == NULL) return true;
duke@435 961 if (stack_base() >= adr && adr >= end) return true;
duke@435 962
duke@435 963 return false;
duke@435 964 }
duke@435 965
duke@435 966
rbackman@5419 967 bool Thread::is_in_usable_stack(address adr) const {
rbackman@5419 968 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0;
rbackman@5419 969 size_t usable_stack_size = _stack_size - stack_guard_size;
rbackman@5419 970
rbackman@5419 971 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size));
rbackman@5419 972 }
rbackman@5419 973
rbackman@5419 974
duke@435 975 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter
duke@435 976 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being
duke@435 977 // used for compilation in the future. If that change is made, the need for these methods
duke@435 978 // should be revisited, and they should be removed if possible.
duke@435 979
duke@435 980 bool Thread::is_lock_owned(address adr) const {
kvn@2043 981 return on_local_stack(adr);
duke@435 982 }
duke@435 983
duke@435 984 bool Thread::set_as_starting_thread() {
duke@435 985 // NOTE: this must be called inside the main thread.
duke@435 986 return os::create_main_thread((JavaThread*)this);
duke@435 987 }
duke@435 988
coleenp@2497 989 static void initialize_class(Symbol* class_name, TRAPS) {
coleenp@4037 990 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK);
coleenp@4037 991 InstanceKlass::cast(klass)->initialize(CHECK);
duke@435 992 }
duke@435 993
duke@435 994
duke@435 995 // Creates the initial ThreadGroup
duke@435 996 static Handle create_initial_thread_group(TRAPS) {
coleenp@4037 997 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH);
duke@435 998 instanceKlassHandle klass (THREAD, k);
duke@435 999
duke@435 1000 Handle system_instance = klass->allocate_instance_handle(CHECK_NH);
duke@435 1001 {
duke@435 1002 JavaValue result(T_VOID);
duke@435 1003 JavaCalls::call_special(&result,
duke@435 1004 system_instance,
duke@435 1005 klass,
coleenp@2497 1006 vmSymbols::object_initializer_name(),
coleenp@2497 1007 vmSymbols::void_method_signature(),
duke@435 1008 CHECK_NH);
duke@435 1009 }
duke@435 1010 Universe::set_system_thread_group(system_instance());
duke@435 1011
duke@435 1012 Handle main_instance = klass->allocate_instance_handle(CHECK_NH);
duke@435 1013 {
duke@435 1014 JavaValue result(T_VOID);
duke@435 1015 Handle string = java_lang_String::create_from_str("main", CHECK_NH);
duke@435 1016 JavaCalls::call_special(&result,
duke@435 1017 main_instance,
duke@435 1018 klass,
coleenp@2497 1019 vmSymbols::object_initializer_name(),
coleenp@2497 1020 vmSymbols::threadgroup_string_void_signature(),
duke@435 1021 system_instance,
duke@435 1022 string,
duke@435 1023 CHECK_NH);
duke@435 1024 }
duke@435 1025 return main_instance;
duke@435 1026 }
duke@435 1027
duke@435 1028 // Creates the initial Thread
duke@435 1029 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) {
coleenp@4037 1030 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL);
duke@435 1031 instanceKlassHandle klass (THREAD, k);
duke@435 1032 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL);
duke@435 1033
duke@435 1034 java_lang_Thread::set_thread(thread_oop(), thread);
duke@435 1035 java_lang_Thread::set_priority(thread_oop(), NormPriority);
duke@435 1036 thread->set_threadObj(thread_oop());
duke@435 1037
duke@435 1038 Handle string = java_lang_String::create_from_str("main", CHECK_NULL);
duke@435 1039
duke@435 1040 JavaValue result(T_VOID);
duke@435 1041 JavaCalls::call_special(&result, thread_oop,
duke@435 1042 klass,
coleenp@2497 1043 vmSymbols::object_initializer_name(),
coleenp@2497 1044 vmSymbols::threadgroup_string_void_signature(),
duke@435 1045 thread_group,
duke@435 1046 string,
duke@435 1047 CHECK_NULL);
duke@435 1048 return thread_oop();
duke@435 1049 }
duke@435 1050
duke@435 1051 static void call_initializeSystemClass(TRAPS) {
coleenp@4037 1052 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK);
duke@435 1053 instanceKlassHandle klass (THREAD, k);
duke@435 1054
duke@435 1055 JavaValue result(T_VOID);
coleenp@2497 1056 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(),
coleenp@2497 1057 vmSymbols::void_method_signature(), CHECK);
duke@435 1058 }
duke@435 1059
twisti@3884 1060 char java_runtime_name[128] = "";
sla@4232 1061 char java_runtime_version[128] = "";
twisti@3884 1062
twisti@3884 1063 // extract the JRE name from sun.misc.Version.java_runtime_name
twisti@3884 1064 static const char* get_java_runtime_name(TRAPS) {
coleenp@4037 1065 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(),
twisti@3884 1066 Handle(), Handle(), CHECK_AND_CLEAR_NULL);
twisti@3884 1067 fieldDescriptor fd;
twisti@3884 1068 bool found = k != NULL &&
coleenp@4037 1069 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(),
twisti@3884 1070 vmSymbols::string_signature(), &fd);
twisti@3884 1071 if (found) {
twisti@3884 1072 oop name_oop = k->java_mirror()->obj_field(fd.offset());
twisti@3884 1073 if (name_oop == NULL)
twisti@3884 1074 return NULL;
twisti@3884 1075 const char* name = java_lang_String::as_utf8_string(name_oop,
twisti@3884 1076 java_runtime_name,
twisti@3884 1077 sizeof(java_runtime_name));
twisti@3884 1078 return name;
twisti@3884 1079 } else {
twisti@3884 1080 return NULL;
twisti@3884 1081 }
twisti@3884 1082 }
twisti@3884 1083
sla@4232 1084 // extract the JRE version from sun.misc.Version.java_runtime_version
sla@4232 1085 static const char* get_java_runtime_version(TRAPS) {
sla@4232 1086 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(),
sla@4232 1087 Handle(), Handle(), CHECK_AND_CLEAR_NULL);
sla@4232 1088 fieldDescriptor fd;
sla@4232 1089 bool found = k != NULL &&
sla@4232 1090 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(),
sla@4232 1091 vmSymbols::string_signature(), &fd);
sla@4232 1092 if (found) {
sla@4232 1093 oop name_oop = k->java_mirror()->obj_field(fd.offset());
sla@4232 1094 if (name_oop == NULL)
sla@4232 1095 return NULL;
sla@4232 1096 const char* name = java_lang_String::as_utf8_string(name_oop,
sla@4232 1097 java_runtime_version,
sla@4232 1098 sizeof(java_runtime_version));
sla@4232 1099 return name;
sla@4232 1100 } else {
sla@4232 1101 return NULL;
sla@4232 1102 }
sla@4232 1103 }
sla@4232 1104
kevinw@2449 1105 // General purpose hook into Java code, run once when the VM is initialized.
kevinw@2449 1106 // The Java library method itself may be changed independently from the VM.
kevinw@2449 1107 static void call_postVMInitHook(TRAPS) {
dholmes@6033 1108 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD);
kevinw@2449 1109 instanceKlassHandle klass (THREAD, k);
kevinw@2449 1110 if (klass.not_null()) {
kevinw@2449 1111 JavaValue result(T_VOID);
coleenp@2497 1112 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(),
coleenp@2497 1113 vmSymbols::void_method_signature(),
kevinw@2449 1114 CHECK);
kevinw@2449 1115 }
kevinw@2449 1116 }
kevinw@2449 1117
duke@435 1118 static void reset_vm_info_property(TRAPS) {
duke@435 1119 // the vm info string
duke@435 1120 ResourceMark rm(THREAD);
duke@435 1121 const char *vm_info = VM_Version::vm_info_string();
duke@435 1122
duke@435 1123 // java.lang.System class
coleenp@4037 1124 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK);
duke@435 1125 instanceKlassHandle klass (THREAD, k);
duke@435 1126
duke@435 1127 // setProperty arguments
duke@435 1128 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK);
duke@435 1129 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK);
duke@435 1130
duke@435 1131 // return value
duke@435 1132 JavaValue r(T_OBJECT);
duke@435 1133
duke@435 1134 // public static String setProperty(String key, String value);
duke@435 1135 JavaCalls::call_static(&r,
duke@435 1136 klass,
coleenp@2497 1137 vmSymbols::setProperty_name(),
coleenp@2497 1138 vmSymbols::string_string_string_signature(),
duke@435 1139 key_str,
duke@435 1140 value_str,
duke@435 1141 CHECK);
duke@435 1142 }
duke@435 1143
duke@435 1144
duke@435 1145 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) {
duke@435 1146 assert(thread_group.not_null(), "thread group should be specified");
duke@435 1147 assert(threadObj() == NULL, "should only create Java thread object once");
duke@435 1148
coleenp@4037 1149 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK);
duke@435 1150 instanceKlassHandle klass (THREAD, k);
duke@435 1151 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
duke@435 1152
duke@435 1153 java_lang_Thread::set_thread(thread_oop(), this);
duke@435 1154 java_lang_Thread::set_priority(thread_oop(), NormPriority);
duke@435 1155 set_threadObj(thread_oop());
duke@435 1156
duke@435 1157 JavaValue result(T_VOID);
duke@435 1158 if (thread_name != NULL) {
duke@435 1159 Handle name = java_lang_String::create_from_str(thread_name, CHECK);
duke@435 1160 // Thread gets assigned specified name and null target
duke@435 1161 JavaCalls::call_special(&result,
duke@435 1162 thread_oop,
duke@435 1163 klass,
coleenp@2497 1164 vmSymbols::object_initializer_name(),
coleenp@2497 1165 vmSymbols::threadgroup_string_void_signature(),
duke@435 1166 thread_group, // Argument 1
duke@435 1167 name, // Argument 2
duke@435 1168 THREAD);
duke@435 1169 } else {
duke@435 1170 // Thread gets assigned name "Thread-nnn" and null target
duke@435 1171 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument)
duke@435 1172 JavaCalls::call_special(&result,
duke@435 1173 thread_oop,
duke@435 1174 klass,
coleenp@2497 1175 vmSymbols::object_initializer_name(),
coleenp@2497 1176 vmSymbols::threadgroup_runnable_void_signature(),
duke@435 1177 thread_group, // Argument 1
duke@435 1178 Handle(), // Argument 2
duke@435 1179 THREAD);
duke@435 1180 }
duke@435 1181
duke@435 1182
duke@435 1183 if (daemon) {
duke@435 1184 java_lang_Thread::set_daemon(thread_oop());
duke@435 1185 }
duke@435 1186
duke@435 1187 if (HAS_PENDING_EXCEPTION) {
duke@435 1188 return;
duke@435 1189 }
duke@435 1190
never@1577 1191 KlassHandle group(this, SystemDictionary::ThreadGroup_klass());
duke@435 1192 Handle threadObj(this, this->threadObj());
duke@435 1193
duke@435 1194 JavaCalls::call_special(&result,
duke@435 1195 thread_group,
duke@435 1196 group,
coleenp@2497 1197 vmSymbols::add_method_name(),
coleenp@2497 1198 vmSymbols::thread_void_signature(),
duke@435 1199 threadObj, // Arg 1
duke@435 1200 THREAD);
duke@435 1201
duke@435 1202
duke@435 1203 }
duke@435 1204
duke@435 1205 // NamedThread -- non-JavaThread subclasses with multiple
duke@435 1206 // uniquely named instances should derive from this.
duke@435 1207 NamedThread::NamedThread() : Thread() {
duke@435 1208 _name = NULL;
minqi@1554 1209 _processed_thread = NULL;
duke@435 1210 }
duke@435 1211
duke@435 1212 NamedThread::~NamedThread() {
duke@435 1213 if (_name != NULL) {
zgu@3900 1214 FREE_C_HEAP_ARRAY(char, _name, mtThread);
duke@435 1215 _name = NULL;
duke@435 1216 }
duke@435 1217 }
duke@435 1218
duke@435 1219 void NamedThread::set_name(const char* format, ...) {
duke@435 1220 guarantee(_name == NULL, "Only get to set name once.");
zgu@3900 1221 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread);
duke@435 1222 guarantee(_name != NULL, "alloc failure");
duke@435 1223 va_list ap;
duke@435 1224 va_start(ap, format);
duke@435 1225 jio_vsnprintf(_name, max_name_len, format, ap);
duke@435 1226 va_end(ap);
duke@435 1227 }
duke@435 1228
duke@435 1229 // ======= WatcherThread ========
duke@435 1230
duke@435 1231 // The watcher thread exists to simulate timer interrupts. It should
duke@435 1232 // be replaced by an abstraction over whatever native support for
duke@435 1233 // timer interrupts exists on the platform.
duke@435 1234
duke@435 1235 WatcherThread* WatcherThread::_watcher_thread = NULL;
rbackman@4250 1236 bool WatcherThread::_startable = false;
bobv@2036 1237 volatile bool WatcherThread::_should_terminate = false;
duke@435 1238
rbackman@5424 1239 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) {
duke@435 1240 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread");
duke@435 1241 if (os::create_thread(this, os::watcher_thread)) {
duke@435 1242 _watcher_thread = this;
duke@435 1243
duke@435 1244 // Set the watcher thread to the highest OS priority which should not be
duke@435 1245 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY
duke@435 1246 // is created. The only normal thread using this priority is the reference
duke@435 1247 // handler thread, which runs for very short intervals only.
duke@435 1248 // If the VMThread's priority is not lower than the WatcherThread profiling
duke@435 1249 // will be inaccurate.
duke@435 1250 os::set_priority(this, MaxPriority);
duke@435 1251 if (!DisableStartThread) {
duke@435 1252 os::start_thread(this);
duke@435 1253 }
duke@435 1254 }
duke@435 1255 }
duke@435 1256
rbackman@4250 1257 int WatcherThread::sleep() const {
rbackman@4250 1258 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
rbackman@4250 1259
rbackman@4250 1260 // remaining will be zero if there are no tasks,
rbackman@4250 1261 // causing the WatcherThread to sleep until a task is
rbackman@4250 1262 // enrolled
rbackman@4250 1263 int remaining = PeriodicTask::time_to_wait();
rbackman@4250 1264 int time_slept = 0;
rbackman@4250 1265
rbackman@4250 1266 // we expect this to timeout - we only ever get unparked when
rbackman@4250 1267 // we should terminate or when a new task has been enrolled
rbackman@4250 1268 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */);
rbackman@4250 1269
rbackman@4250 1270 jlong time_before_loop = os::javaTimeNanos();
rbackman@4250 1271
rbackman@4250 1272 for (;;) {
rbackman@4250 1273 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining);
rbackman@4250 1274 jlong now = os::javaTimeNanos();
rbackman@4250 1275
rbackman@4250 1276 if (remaining == 0) {
rbackman@4250 1277 // if we didn't have any tasks we could have waited for a long time
rbackman@4250 1278 // consider the time_slept zero and reset time_before_loop
rbackman@4250 1279 time_slept = 0;
rbackman@4250 1280 time_before_loop = now;
rbackman@4250 1281 } else {
rbackman@4250 1282 // need to recalulate since we might have new tasks in _tasks
rbackman@4250 1283 time_slept = (int) ((now - time_before_loop) / 1000000);
rbackman@4250 1284 }
rbackman@4250 1285
rbackman@4250 1286 // Change to task list or spurious wakeup of some kind
rbackman@4250 1287 if (timedout || _should_terminate) {
rbackman@4250 1288 break;
rbackman@4250 1289 }
rbackman@4250 1290
rbackman@4250 1291 remaining = PeriodicTask::time_to_wait();
rbackman@4250 1292 if (remaining == 0) {
rbackman@4250 1293 // Last task was just disenrolled so loop around and wait until
rbackman@4250 1294 // another task gets enrolled
rbackman@4250 1295 continue;
rbackman@4250 1296 }
rbackman@4250 1297
rbackman@4250 1298 remaining -= time_slept;
rbackman@4250 1299 if (remaining <= 0)
rbackman@4250 1300 break;
rbackman@4250 1301 }
rbackman@4250 1302
rbackman@4250 1303 return time_slept;
rbackman@4250 1304 }
rbackman@4250 1305
duke@435 1306 void WatcherThread::run() {
duke@435 1307 assert(this == watcher_thread(), "just checking");
duke@435 1308
duke@435 1309 this->record_stack_base_and_size();
duke@435 1310 this->initialize_thread_local_storage();
duke@435 1311 this->set_active_handles(JNIHandleBlock::allocate_block());
duke@435 1312 while(!_should_terminate) {
duke@435 1313 assert(watcher_thread() == Thread::current(), "thread consistency check");
duke@435 1314 assert(watcher_thread() == this, "thread consistency check");
duke@435 1315
duke@435 1316 // Calculate how long it'll be until the next PeriodicTask work
duke@435 1317 // should be done, and sleep that amount of time.
rbackman@4250 1318 int time_waited = sleep();
duke@435 1319
duke@435 1320 if (is_error_reported()) {
duke@435 1321 // A fatal error has happened, the error handler(VMError::report_and_die)
duke@435 1322 // should abort JVM after creating an error log file. However in some
duke@435 1323 // rare cases, the error handler itself might deadlock. Here we try to
duke@435 1324 // kill JVM if the fatal error handler fails to abort in 2 minutes.
duke@435 1325 //
duke@435 1326 // This code is in WatcherThread because WatcherThread wakes up
duke@435 1327 // periodically so the fatal error handler doesn't need to do anything;
duke@435 1328 // also because the WatcherThread is less likely to crash than other
duke@435 1329 // threads.
duke@435 1330
duke@435 1331 for (;;) {
duke@435 1332 if (!ShowMessageBoxOnError
duke@435 1333 && (OnError == NULL || OnError[0] == '\0')
duke@435 1334 && Arguments::abort_hook() == NULL) {
duke@435 1335 os::sleep(this, 2 * 60 * 1000, false);
duke@435 1336 fdStream err(defaultStream::output_fd());
duke@435 1337 err.print_raw_cr("# [ timer expired, abort... ]");
duke@435 1338 // skip atexit/vm_exit/vm_abort hooks
duke@435 1339 os::die();
duke@435 1340 }
duke@435 1341
duke@435 1342 // Wake up 5 seconds later, the fatal handler may reset OnError or
duke@435 1343 // ShowMessageBoxOnError when it is ready to abort.
duke@435 1344 os::sleep(this, 5 * 1000, false);
duke@435 1345 }
duke@435 1346 }
duke@435 1347
rbackman@4250 1348 PeriodicTask::real_time_tick(time_waited);
duke@435 1349 }
duke@435 1350
duke@435 1351 // Signal that it is terminated
duke@435 1352 {
duke@435 1353 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag);
duke@435 1354 _watcher_thread = NULL;
duke@435 1355 Terminator_lock->notify();
duke@435 1356 }
duke@435 1357
duke@435 1358 // Thread destructor usually does this..
duke@435 1359 ThreadLocalStorage::set_thread(NULL);
duke@435 1360 }
duke@435 1361
duke@435 1362 void WatcherThread::start() {
rbackman@4250 1363 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required");
rbackman@4250 1364
rbackman@4250 1365 if (watcher_thread() == NULL && _startable) {
duke@435 1366 _should_terminate = false;
duke@435 1367 // Create the single instance of WatcherThread
duke@435 1368 new WatcherThread();
duke@435 1369 }
duke@435 1370 }
duke@435 1371
rbackman@4250 1372 void WatcherThread::make_startable() {
rbackman@4250 1373 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required");
rbackman@4250 1374 _startable = true;
rbackman@4250 1375 }
rbackman@4250 1376
duke@435 1377 void WatcherThread::stop() {
rbackman@4250 1378 {
rbackman@4250 1379 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
rbackman@4250 1380 _should_terminate = true;
rbackman@4250 1381 OrderAccess::fence(); // ensure WatcherThread sees update in main loop
rbackman@4250 1382
rbackman@4250 1383 WatcherThread* watcher = watcher_thread();
rbackman@4250 1384 if (watcher != NULL)
rbackman@4250 1385 watcher->unpark();
rbackman@4250 1386 }
rbackman@4250 1387
duke@435 1388 // it is ok to take late safepoints here, if needed
duke@435 1389 MutexLocker mu(Terminator_lock);
bobv@2036 1390
duke@435 1391 while(watcher_thread() != NULL) {
duke@435 1392 // This wait should make safepoint checks, wait without a timeout,
duke@435 1393 // and wait as a suspend-equivalent condition.
duke@435 1394 //
duke@435 1395 // Note: If the FlatProfiler is running, then this thread is waiting
duke@435 1396 // for the WatcherThread to terminate and the WatcherThread, via the
duke@435 1397 // FlatProfiler task, is waiting for the external suspend request on
duke@435 1398 // this thread to complete. wait_for_ext_suspend_completion() will
duke@435 1399 // eventually timeout, but that takes time. Making this wait a
duke@435 1400 // suspend-equivalent condition solves that timeout problem.
duke@435 1401 //
duke@435 1402 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
duke@435 1403 Mutex::_as_suspend_equivalent_flag);
duke@435 1404 }
duke@435 1405 }
duke@435 1406
rbackman@4250 1407 void WatcherThread::unpark() {
rbackman@4250 1408 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
rbackman@4250 1409 PeriodicTask_lock->notify();
rbackman@4250 1410 }
rbackman@4250 1411
duke@435 1412 void WatcherThread::print_on(outputStream* st) const {
duke@435 1413 st->print("\"%s\" ", name());
duke@435 1414 Thread::print_on(st);
duke@435 1415 st->cr();
duke@435 1416 }
duke@435 1417
duke@435 1418 // ======= JavaThread ========
duke@435 1419
duke@435 1420 // A JavaThread is a normal Java thread
duke@435 1421
duke@435 1422 void JavaThread::initialize() {
duke@435 1423 // Initialize fields
ysr@777 1424
vkempik@6552 1425 // Set the claimed par_id to UINT_MAX (ie not claiming any par_ids)
vkempik@6552 1426 set_claimed_par_id(UINT_MAX);
ysr@777 1427
duke@435 1428 set_saved_exception_pc(NULL);
duke@435 1429 set_threadObj(NULL);
duke@435 1430 _anchor.clear();
duke@435 1431 set_entry_point(NULL);
duke@435 1432 set_jni_functions(jni_functions());
duke@435 1433 set_callee_target(NULL);
duke@435 1434 set_vm_result(NULL);
duke@435 1435 set_vm_result_2(NULL);
duke@435 1436 set_vframe_array_head(NULL);
duke@435 1437 set_vframe_array_last(NULL);
duke@435 1438 set_deferred_locals(NULL);
duke@435 1439 set_deopt_mark(NULL);
iveresov@2169 1440 set_deopt_nmethod(NULL);
duke@435 1441 clear_must_deopt_id();
duke@435 1442 set_monitor_chunks(NULL);
duke@435 1443 set_next(NULL);
duke@435 1444 set_thread_state(_thread_new);
duke@435 1445 _terminated = _not_terminated;
duke@435 1446 _privileged_stack_top = NULL;
duke@435 1447 _array_for_gc = NULL;
duke@435 1448 _suspend_equivalent = false;
duke@435 1449 _in_deopt_handler = 0;
duke@435 1450 _doing_unsafe_access = false;
duke@435 1451 _stack_guard_state = stack_guard_unused;
hseigel@5784 1452 (void)const_cast<oop&>(_exception_oop = NULL);
duke@435 1453 _exception_pc = 0;
duke@435 1454 _exception_handler_pc = 0;
twisti@2258 1455 _is_method_handle_return = 0;
duke@435 1456 _jvmti_thread_state= NULL;
dcubed@1648 1457 _should_post_on_exceptions_flag = JNI_FALSE;
duke@435 1458 _jvmti_get_loaded_classes_closure = NULL;
duke@435 1459 _interp_only_mode = 0;
duke@435 1460 _special_runtime_exit_condition = _no_async_condition;
duke@435 1461 _pending_async_exception = NULL;
duke@435 1462 _thread_stat = NULL;
duke@435 1463 _thread_stat = new ThreadStatistics();
duke@435 1464 _blocked_on_compilation = false;
duke@435 1465 _jni_active_critical = 0;
duke@435 1466 _do_not_unlock_if_synchronized = false;
duke@435 1467 _cached_monitor_info = NULL;
duke@435 1468 _parker = Parker::Allocate(this) ;
duke@435 1469
duke@435 1470 #ifndef PRODUCT
duke@435 1471 _jmp_ring_index = 0;
duke@435 1472 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) {
duke@435 1473 record_jump(NULL, NULL, NULL, 0);
duke@435 1474 }
duke@435 1475 #endif /* PRODUCT */
duke@435 1476
duke@435 1477 set_thread_profiler(NULL);
duke@435 1478 if (FlatProfiler::is_active()) {
duke@435 1479 // This is where we would decide to either give each thread it's own profiler
duke@435 1480 // or use one global one from FlatProfiler,
duke@435 1481 // or up to some count of the number of profiled threads, etc.
duke@435 1482 ThreadProfiler* pp = new ThreadProfiler();
duke@435 1483 pp->engage();
duke@435 1484 set_thread_profiler(pp);
duke@435 1485 }
duke@435 1486
duke@435 1487 // Setup safepoint state info for this thread
duke@435 1488 ThreadSafepointState::create(this);
duke@435 1489
duke@435 1490 debug_only(_java_call_counter = 0);
duke@435 1491
duke@435 1492 // JVMTI PopFrame support
duke@435 1493 _popframe_condition = popframe_inactive;
duke@435 1494 _popframe_preserved_args = NULL;
duke@435 1495 _popframe_preserved_args_size = 0;
duke@435 1496
duke@435 1497 pd_initialize();
duke@435 1498 }
duke@435 1499
jprovino@4542 1500 #if INCLUDE_ALL_GCS
ysr@777 1501 SATBMarkQueueSet JavaThread::_satb_mark_queue_set;
ysr@777 1502 DirtyCardQueueSet JavaThread::_dirty_card_queue_set;
jprovino@4542 1503 #endif // INCLUDE_ALL_GCS
ysr@777 1504
dcubed@3202 1505 JavaThread::JavaThread(bool is_attaching_via_jni) :
ysr@777 1506 Thread()
jprovino@4542 1507 #if INCLUDE_ALL_GCS
ysr@777 1508 , _satb_mark_queue(&_satb_mark_queue_set),
ysr@777 1509 _dirty_card_queue(&_dirty_card_queue_set)
jprovino@4542 1510 #endif // INCLUDE_ALL_GCS
ysr@777 1511 {
duke@435 1512 initialize();
dcubed@3202 1513 if (is_attaching_via_jni) {
dcubed@3202 1514 _jni_attach_state = _attaching_via_jni;
dcubed@3202 1515 } else {
dcubed@3202 1516 _jni_attach_state = _not_attaching_via_jni;
dcubed@3202 1517 }
johnc@4552 1518 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor");
duke@435 1519 }
duke@435 1520
duke@435 1521 bool JavaThread::reguard_stack(address cur_sp) {
duke@435 1522 if (_stack_guard_state != stack_guard_yellow_disabled) {
duke@435 1523 return true; // Stack already guarded or guard pages not needed.
duke@435 1524 }
duke@435 1525
duke@435 1526 if (register_stack_overflow()) {
duke@435 1527 // For those architectures which have separate register and
duke@435 1528 // memory stacks, we must check the register stack to see if
duke@435 1529 // it has overflowed.
duke@435 1530 return false;
duke@435 1531 }
duke@435 1532
duke@435 1533 // Java code never executes within the yellow zone: the latter is only
duke@435 1534 // there to provoke an exception during stack banging. If java code
duke@435 1535 // is executing there, either StackShadowPages should be larger, or
duke@435 1536 // some exception code in c1, c2 or the interpreter isn't unwinding
duke@435 1537 // when it should.
duke@435 1538 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages");
duke@435 1539
duke@435 1540 enable_stack_yellow_zone();
duke@435 1541 return true;
duke@435 1542 }
duke@435 1543
duke@435 1544 bool JavaThread::reguard_stack(void) {
duke@435 1545 return reguard_stack(os::current_stack_pointer());
duke@435 1546 }
duke@435 1547
duke@435 1548
duke@435 1549 void JavaThread::block_if_vm_exited() {
duke@435 1550 if (_terminated == _vm_exited) {
duke@435 1551 // _vm_exited is set at safepoint, and Threads_lock is never released
duke@435 1552 // we will block here forever
duke@435 1553 Threads_lock->lock_without_safepoint_check();
duke@435 1554 ShouldNotReachHere();
duke@435 1555 }
duke@435 1556 }
duke@435 1557
duke@435 1558
duke@435 1559 // Remove this ifdef when C1 is ported to the compiler interface.
duke@435 1560 static void compiler_thread_entry(JavaThread* thread, TRAPS);
duke@435 1561
ysr@777 1562 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) :
ysr@777 1563 Thread()
jprovino@4542 1564 #if INCLUDE_ALL_GCS
ysr@777 1565 , _satb_mark_queue(&_satb_mark_queue_set),
ysr@777 1566 _dirty_card_queue(&_dirty_card_queue_set)
jprovino@4542 1567 #endif // INCLUDE_ALL_GCS
ysr@777 1568 {
duke@435 1569 if (TraceThreadEvents) {
duke@435 1570 tty->print_cr("creating thread %p", this);
duke@435 1571 }
duke@435 1572 initialize();
dcubed@3202 1573 _jni_attach_state = _not_attaching_via_jni;
duke@435 1574 set_entry_point(entry_point);
duke@435 1575 // Create the native thread itself.
duke@435 1576 // %note runtime_23
duke@435 1577 os::ThreadType thr_type = os::java_thread;
duke@435 1578 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread :
duke@435 1579 os::java_thread;
duke@435 1580 os::create_thread(this, thr_type, stack_sz);
duke@435 1581 // The _osthread may be NULL here because we ran out of memory (too many threads active).
duke@435 1582 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller
duke@435 1583 // may hold a lock and all locks must be unlocked before throwing the exception (throwing
duke@435 1584 // the exception consists of creating the exception object & initializing it, initialization
duke@435 1585 // will leave the VM via a JavaCall and then all locks must be unlocked).
duke@435 1586 //
duke@435 1587 // The thread is still suspended when we reach here. Thread must be explicit started
duke@435 1588 // by creator! Furthermore, the thread must also explicitly be added to the Threads list
duke@435 1589 // by calling Threads:add. The reason why this is not done here, is because the thread
duke@435 1590 // object must be fully initialized (take a look at JVM_Start)
duke@435 1591 }
duke@435 1592
duke@435 1593 JavaThread::~JavaThread() {
duke@435 1594 if (TraceThreadEvents) {
duke@435 1595 tty->print_cr("terminate thread %p", this);
duke@435 1596 }
duke@435 1597
duke@435 1598 // JSR166 -- return the parker to the free list
duke@435 1599 Parker::Release(_parker);
duke@435 1600 _parker = NULL ;
duke@435 1601
duke@435 1602 // Free any remaining previous UnrollBlock
duke@435 1603 vframeArray* old_array = vframe_array_last();
duke@435 1604
duke@435 1605 if (old_array != NULL) {
duke@435 1606 Deoptimization::UnrollBlock* old_info = old_array->unroll_block();
duke@435 1607 old_array->set_unroll_block(NULL);
duke@435 1608 delete old_info;
duke@435 1609 delete old_array;
duke@435 1610 }
duke@435 1611
duke@435 1612 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals();
duke@435 1613 if (deferred != NULL) {
duke@435 1614 // This can only happen if thread is destroyed before deoptimization occurs.
duke@435 1615 assert(deferred->length() != 0, "empty array!");
duke@435 1616 do {
duke@435 1617 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0);
duke@435 1618 deferred->remove_at(0);
duke@435 1619 // individual jvmtiDeferredLocalVariableSet are CHeapObj's
duke@435 1620 delete dlv;
duke@435 1621 } while (deferred->length() != 0);
duke@435 1622 delete deferred;
duke@435 1623 }
duke@435 1624
duke@435 1625 // All Java related clean up happens in exit
duke@435 1626 ThreadSafepointState::destroy(this);
duke@435 1627 if (_thread_profiler != NULL) delete _thread_profiler;
duke@435 1628 if (_thread_stat != NULL) delete _thread_stat;
duke@435 1629 }
duke@435 1630
duke@435 1631
duke@435 1632 // The first routine called by a new Java thread
duke@435 1633 void JavaThread::run() {
duke@435 1634 // initialize thread-local alloc buffer related fields
duke@435 1635 this->initialize_tlab();
duke@435 1636
duke@435 1637 // used to test validitity of stack trace backs
duke@435 1638 this->record_base_of_stack_pointer();
duke@435 1639
duke@435 1640 // Record real stack base and size.
duke@435 1641 this->record_stack_base_and_size();
duke@435 1642
duke@435 1643 // Initialize thread local storage; set before calling MutexLocker
duke@435 1644 this->initialize_thread_local_storage();
duke@435 1645
duke@435 1646 this->create_stack_guard_pages();
duke@435 1647
bobv@2036 1648 this->cache_global_variables();
bobv@2036 1649
duke@435 1650 // Thread is now sufficient initialized to be handled by the safepoint code as being
duke@435 1651 // in the VM. Change thread state from _thread_new to _thread_in_vm
duke@435 1652 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm);
duke@435 1653
duke@435 1654 assert(JavaThread::current() == this, "sanity check");
duke@435 1655 assert(!Thread::current()->owns_locks(), "sanity check");
duke@435 1656
duke@435 1657 DTRACE_THREAD_PROBE(start, this);
duke@435 1658
duke@435 1659 // This operation might block. We call that after all safepoint checks for a new thread has
duke@435 1660 // been completed.
duke@435 1661 this->set_active_handles(JNIHandleBlock::allocate_block());
duke@435 1662
duke@435 1663 if (JvmtiExport::should_post_thread_life()) {
duke@435 1664 JvmtiExport::post_thread_start(this);
duke@435 1665 }
duke@435 1666
sla@5237 1667 EventThreadStart event;
sla@5237 1668 if (event.should_commit()) {
sla@5237 1669 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj()));
sla@5237 1670 event.commit();
sla@5237 1671 }
phh@3427 1672
duke@435 1673 // We call another function to do the rest so we are sure that the stack addresses used
duke@435 1674 // from there will be lower than the stack base just computed
duke@435 1675 thread_main_inner();
duke@435 1676
duke@435 1677 // Note, thread is no longer valid at this point!
duke@435 1678 }
duke@435 1679
duke@435 1680
duke@435 1681 void JavaThread::thread_main_inner() {
duke@435 1682 assert(JavaThread::current() == this, "sanity check");
duke@435 1683 assert(this->threadObj() != NULL, "just checking");
duke@435 1684
dholmes@2482 1685 // Execute thread entry point unless this thread has a pending exception
dholmes@2482 1686 // or has been stopped before starting.
duke@435 1687 // Note: Due to JVM_StopThread we can have pending exceptions already!
dholmes@2482 1688 if (!this->has_pending_exception() &&
dholmes@2482 1689 !java_lang_Thread::is_stillborn(this->threadObj())) {
dcubed@3202 1690 {
dcubed@3202 1691 ResourceMark rm(this);
dcubed@3202 1692 this->set_native_thread_name(this->get_thread_name());
dcubed@3202 1693 }
duke@435 1694 HandleMark hm(this);
duke@435 1695 this->entry_point()(this, this);
duke@435 1696 }
duke@435 1697
duke@435 1698 DTRACE_THREAD_PROBE(stop, this);
duke@435 1699
duke@435 1700 this->exit(false);
duke@435 1701 delete this;
duke@435 1702 }
duke@435 1703
duke@435 1704
duke@435 1705 static void ensure_join(JavaThread* thread) {
duke@435 1706 // We do not need to grap the Threads_lock, since we are operating on ourself.
duke@435 1707 Handle threadObj(thread, thread->threadObj());
duke@435 1708 assert(threadObj.not_null(), "java thread object must exist");
duke@435 1709 ObjectLocker lock(threadObj, thread);
duke@435 1710 // Ignore pending exception (ThreadDeath), since we are exiting anyway
duke@435 1711 thread->clear_pending_exception();
duke@435 1712 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED.
duke@435 1713 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED);
dholmes@2482 1714 // Clear the native thread instance - this makes isAlive return false and allows the join()
dholmes@2482 1715 // to complete once we've done the notify_all below
duke@435 1716 java_lang_Thread::set_thread(threadObj(), NULL);
duke@435 1717 lock.notify_all(thread);
duke@435 1718 // Ignore pending exception (ThreadDeath), since we are exiting anyway
duke@435 1719 thread->clear_pending_exception();
duke@435 1720 }
duke@435 1721
iveresov@876 1722
duke@435 1723 // For any new cleanup additions, please check to see if they need to be applied to
duke@435 1724 // cleanup_failed_attach_current_thread as well.
duke@435 1725 void JavaThread::exit(bool destroy_vm, ExitType exit_type) {
duke@435 1726 assert(this == JavaThread::current(), "thread consistency check");
duke@435 1727
duke@435 1728 HandleMark hm(this);
duke@435 1729 Handle uncaught_exception(this, this->pending_exception());
duke@435 1730 this->clear_pending_exception();
duke@435 1731 Handle threadObj(this, this->threadObj());
duke@435 1732 assert(threadObj.not_null(), "Java thread object should be created");
duke@435 1733
duke@435 1734 if (get_thread_profiler() != NULL) {
duke@435 1735 get_thread_profiler()->disengage();
duke@435 1736 ResourceMark rm;
duke@435 1737 get_thread_profiler()->print(get_thread_name());
duke@435 1738 }
duke@435 1739
duke@435 1740
duke@435 1741 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place
duke@435 1742 {
duke@435 1743 EXCEPTION_MARK;
duke@435 1744
duke@435 1745 CLEAR_PENDING_EXCEPTION;
duke@435 1746 }
duke@435 1747 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This
duke@435 1748 // has to be fixed by a runtime query method
duke@435 1749 if (!destroy_vm || JDK_Version::is_jdk12x_version()) {
duke@435 1750 // JSR-166: change call from from ThreadGroup.uncaughtException to
duke@435 1751 // java.lang.Thread.dispatchUncaughtException
duke@435 1752 if (uncaught_exception.not_null()) {
duke@435 1753 Handle group(this, java_lang_Thread::threadGroup(threadObj()));
duke@435 1754 {
duke@435 1755 EXCEPTION_MARK;
duke@435 1756 // Check if the method Thread.dispatchUncaughtException() exists. If so
duke@435 1757 // call it. Otherwise we have an older library without the JSR-166 changes,
duke@435 1758 // so call ThreadGroup.uncaughtException()
duke@435 1759 KlassHandle recvrKlass(THREAD, threadObj->klass());
duke@435 1760 CallInfo callinfo;
never@1577 1761 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass());
duke@435 1762 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass,
coleenp@2497 1763 vmSymbols::dispatchUncaughtException_name(),
coleenp@2497 1764 vmSymbols::throwable_void_signature(),
duke@435 1765 KlassHandle(), false, false, THREAD);
duke@435 1766 CLEAR_PENDING_EXCEPTION;
duke@435 1767 methodHandle method = callinfo.selected_method();
duke@435 1768 if (method.not_null()) {
duke@435 1769 JavaValue result(T_VOID);
duke@435 1770 JavaCalls::call_virtual(&result,
duke@435 1771 threadObj, thread_klass,
coleenp@2497 1772 vmSymbols::dispatchUncaughtException_name(),
coleenp@2497 1773 vmSymbols::throwable_void_signature(),
duke@435 1774 uncaught_exception,
duke@435 1775 THREAD);
duke@435 1776 } else {
never@1577 1777 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass());
duke@435 1778 JavaValue result(T_VOID);
duke@435 1779 JavaCalls::call_virtual(&result,
duke@435 1780 group, thread_group,
coleenp@2497 1781 vmSymbols::uncaughtException_name(),
coleenp@2497 1782 vmSymbols::thread_throwable_void_signature(),
duke@435 1783 threadObj, // Arg 1
duke@435 1784 uncaught_exception, // Arg 2
duke@435 1785 THREAD);
duke@435 1786 }
coleenp@2516 1787 if (HAS_PENDING_EXCEPTION) {
coleenp@2516 1788 ResourceMark rm(this);
coleenp@2516 1789 jio_fprintf(defaultStream::error_stream(),
coleenp@2516 1790 "\nException: %s thrown from the UncaughtExceptionHandler"
coleenp@2516 1791 " in thread \"%s\"\n",
hseigel@4278 1792 pending_exception()->klass()->external_name(),
coleenp@2516 1793 get_thread_name());
coleenp@2516 1794 CLEAR_PENDING_EXCEPTION;
coleenp@2516 1795 }
duke@435 1796 }
duke@435 1797 }
duke@435 1798
phh@3427 1799 // Called before the java thread exit since we want to read info
phh@3427 1800 // from java_lang_Thread object
sla@5237 1801 EventThreadEnd event;
sla@5237 1802 if (event.should_commit()) {
sla@5237 1803 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj()));
sla@5237 1804 event.commit();
sla@5237 1805 }
phh@3427 1806
phh@3427 1807 // Call after last event on thread
phh@3427 1808 EVENT_THREAD_EXIT(this);
phh@3427 1809
duke@435 1810 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during
duke@435 1811 // the execution of the method. If that is not enough, then we don't really care. Thread.stop
duke@435 1812 // is deprecated anyhow.
anoll@5919 1813 if (!is_Compiler_thread()) {
anoll@5919 1814 int count = 3;
duke@435 1815 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) {
duke@435 1816 EXCEPTION_MARK;
duke@435 1817 JavaValue result(T_VOID);
never@1577 1818 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass());
duke@435 1819 JavaCalls::call_virtual(&result,
duke@435 1820 threadObj, thread_klass,
coleenp@2497 1821 vmSymbols::exit_method_name(),
coleenp@2497 1822 vmSymbols::void_method_signature(),
duke@435 1823 THREAD);
duke@435 1824 CLEAR_PENDING_EXCEPTION;
duke@435 1825 }
duke@435 1826 }
duke@435 1827 // notify JVMTI
duke@435 1828 if (JvmtiExport::should_post_thread_life()) {
duke@435 1829 JvmtiExport::post_thread_end(this);
duke@435 1830 }
duke@435 1831
duke@435 1832 // We have notified the agents that we are exiting, before we go on,
duke@435 1833 // we must check for a pending external suspend request and honor it
duke@435 1834 // in order to not surprise the thread that made the suspend request.
duke@435 1835 while (true) {
duke@435 1836 {
duke@435 1837 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
duke@435 1838 if (!is_external_suspend()) {
duke@435 1839 set_terminated(_thread_exiting);
duke@435 1840 ThreadService::current_thread_exiting(this);
duke@435 1841 break;
duke@435 1842 }
duke@435 1843 // Implied else:
duke@435 1844 // Things get a little tricky here. We have a pending external
duke@435 1845 // suspend request, but we are holding the SR_lock so we
duke@435 1846 // can't just self-suspend. So we temporarily drop the lock
duke@435 1847 // and then self-suspend.
duke@435 1848 }
duke@435 1849
duke@435 1850 ThreadBlockInVM tbivm(this);
duke@435 1851 java_suspend_self();
duke@435 1852
duke@435 1853 // We're done with this suspend request, but we have to loop around
duke@435 1854 // and check again. Eventually we will get SR_lock without a pending
duke@435 1855 // external suspend request and will be able to mark ourselves as
duke@435 1856 // exiting.
duke@435 1857 }
duke@435 1858 // no more external suspends are allowed at this point
duke@435 1859 } else {
duke@435 1860 // before_exit() has already posted JVMTI THREAD_END events
duke@435 1861 }
duke@435 1862
duke@435 1863 // Notify waiters on thread object. This has to be done after exit() is called
duke@435 1864 // on the thread (if the thread is the last thread in a daemon ThreadGroup the
duke@435 1865 // group should have the destroyed bit set before waiters are notified).
duke@435 1866 ensure_join(this);
duke@435 1867 assert(!this->has_pending_exception(), "ensure_join should have cleared");
duke@435 1868
duke@435 1869 // 6282335 JNI DetachCurrentThread spec states that all Java monitors
duke@435 1870 // held by this thread must be released. A detach operation must only
duke@435 1871 // get here if there are no Java frames on the stack. Therefore, any
duke@435 1872 // owned monitors at this point MUST be JNI-acquired monitors which are
duke@435 1873 // pre-inflated and in the monitor cache.
duke@435 1874 //
duke@435 1875 // ensure_join() ignores IllegalThreadStateExceptions, and so does this.
duke@435 1876 if (exit_type == jni_detach && JNIDetachReleasesMonitors) {
duke@435 1877 assert(!this->has_last_Java_frame(), "detaching with Java frames?");
duke@435 1878 ObjectSynchronizer::release_monitors_owned_by_thread(this);
duke@435 1879 assert(!this->has_pending_exception(), "release_monitors should have cleared");
duke@435 1880 }
duke@435 1881
duke@435 1882 // These things needs to be done while we are still a Java Thread. Make sure that thread
duke@435 1883 // is in a consistent state, in case GC happens
duke@435 1884 assert(_privileged_stack_top == NULL, "must be NULL when we get here");
duke@435 1885
duke@435 1886 if (active_handles() != NULL) {
duke@435 1887 JNIHandleBlock* block = active_handles();
duke@435 1888 set_active_handles(NULL);
duke@435 1889 JNIHandleBlock::release_block(block);
duke@435 1890 }
duke@435 1891
duke@435 1892 if (free_handle_block() != NULL) {
duke@435 1893 JNIHandleBlock* block = free_handle_block();
duke@435 1894 set_free_handle_block(NULL);
duke@435 1895 JNIHandleBlock::release_block(block);
duke@435 1896 }
duke@435 1897
duke@435 1898 // These have to be removed while this is still a valid thread.
duke@435 1899 remove_stack_guard_pages();
duke@435 1900
duke@435 1901 if (UseTLAB) {
duke@435 1902 tlab().make_parsable(true); // retire TLAB
duke@435 1903 }
duke@435 1904
kamg@2446 1905 if (JvmtiEnv::environments_might_exist()) {
dcubed@484 1906 JvmtiExport::cleanup_thread(this);
dcubed@484 1907 }
dcubed@484 1908
johnc@4552 1909 // We must flush any deferred card marks before removing a thread from
johnc@4552 1910 // the list of active threads.
johnc@4552 1911 Universe::heap()->flush_deferred_store_barrier(this);
johnc@4552 1912 assert(deferred_card_mark().is_empty(), "Should have been flushed");
johnc@4552 1913
jprovino@4542 1914 #if INCLUDE_ALL_GCS
johnc@4552 1915 // We must flush the G1-related buffers before removing a thread
johnc@4552 1916 // from the list of active threads. We must do this after any deferred
johnc@4552 1917 // card marks have been flushed (above) so that any entries that are
johnc@4552 1918 // added to the thread's dirty card queue as a result are not lost.
iveresov@876 1919 if (UseG1GC) {
iveresov@876 1920 flush_barrier_queues();
iveresov@876 1921 }
jprovino@4542 1922 #endif // INCLUDE_ALL_GCS
iveresov@876 1923
duke@435 1924 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread
duke@435 1925 Threads::remove(this);
duke@435 1926 }
duke@435 1927
jprovino@4542 1928 #if INCLUDE_ALL_GCS
iveresov@876 1929 // Flush G1-related queues.
iveresov@876 1930 void JavaThread::flush_barrier_queues() {
iveresov@876 1931 satb_mark_queue().flush();
iveresov@876 1932 dirty_card_queue().flush();
iveresov@876 1933 }
tonyp@2197 1934
tonyp@2197 1935 void JavaThread::initialize_queues() {
tonyp@2197 1936 assert(!SafepointSynchronize::is_at_safepoint(),
tonyp@2197 1937 "we should not be at a safepoint");
tonyp@2197 1938
tonyp@2197 1939 ObjPtrQueue& satb_queue = satb_mark_queue();
tonyp@2197 1940 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set();
tonyp@2197 1941 // The SATB queue should have been constructed with its active
tonyp@2197 1942 // field set to false.
tonyp@2197 1943 assert(!satb_queue.is_active(), "SATB queue should not be active");
tonyp@2197 1944 assert(satb_queue.is_empty(), "SATB queue should be empty");
tonyp@2197 1945 // If we are creating the thread during a marking cycle, we should
tonyp@2197 1946 // set the active field of the SATB queue to true.
tonyp@2197 1947 if (satb_queue_set.is_active()) {
tonyp@2197 1948 satb_queue.set_active(true);
tonyp@2197 1949 }
tonyp@2197 1950
tonyp@2197 1951 DirtyCardQueue& dirty_queue = dirty_card_queue();
tonyp@2197 1952 // The dirty card queue should have been constructed with its
tonyp@2197 1953 // active field set to true.
tonyp@2197 1954 assert(dirty_queue.is_active(), "dirty card queue should be active");
tonyp@2197 1955 }
jprovino@4542 1956 #endif // INCLUDE_ALL_GCS
iveresov@876 1957
duke@435 1958 void JavaThread::cleanup_failed_attach_current_thread() {
iveresov@876 1959 if (get_thread_profiler() != NULL) {
iveresov@876 1960 get_thread_profiler()->disengage();
iveresov@876 1961 ResourceMark rm;
iveresov@876 1962 get_thread_profiler()->print(get_thread_name());
iveresov@876 1963 }
iveresov@876 1964
iveresov@876 1965 if (active_handles() != NULL) {
iveresov@876 1966 JNIHandleBlock* block = active_handles();
iveresov@876 1967 set_active_handles(NULL);
iveresov@876 1968 JNIHandleBlock::release_block(block);
iveresov@876 1969 }
iveresov@876 1970
iveresov@876 1971 if (free_handle_block() != NULL) {
iveresov@876 1972 JNIHandleBlock* block = free_handle_block();
iveresov@876 1973 set_free_handle_block(NULL);
iveresov@876 1974 JNIHandleBlock::release_block(block);
iveresov@876 1975 }
iveresov@876 1976
coleenp@1725 1977 // These have to be removed while this is still a valid thread.
coleenp@1725 1978 remove_stack_guard_pages();
coleenp@1725 1979
iveresov@876 1980 if (UseTLAB) {
iveresov@876 1981 tlab().make_parsable(true); // retire TLAB, if any
iveresov@876 1982 }
iveresov@876 1983
jprovino@4542 1984 #if INCLUDE_ALL_GCS
iveresov@876 1985 if (UseG1GC) {
iveresov@876 1986 flush_barrier_queues();
iveresov@876 1987 }
jprovino@4542 1988 #endif // INCLUDE_ALL_GCS
iveresov@876 1989
iveresov@876 1990 Threads::remove(this);
iveresov@876 1991 delete this;
duke@435 1992 }
duke@435 1993
duke@435 1994
iveresov@876 1995
iveresov@876 1996
duke@435 1997 JavaThread* JavaThread::active() {
duke@435 1998 Thread* thread = ThreadLocalStorage::thread();
duke@435 1999 assert(thread != NULL, "just checking");
duke@435 2000 if (thread->is_Java_thread()) {
duke@435 2001 return (JavaThread*) thread;
duke@435 2002 } else {
duke@435 2003 assert(thread->is_VM_thread(), "this must be a vm thread");
duke@435 2004 VM_Operation* op = ((VMThread*) thread)->vm_operation();
duke@435 2005 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread();
duke@435 2006 assert(ret->is_Java_thread(), "must be a Java thread");
duke@435 2007 return ret;
duke@435 2008 }
duke@435 2009 }
duke@435 2010
duke@435 2011 bool JavaThread::is_lock_owned(address adr) const {
xlu@1137 2012 if (Thread::is_lock_owned(adr)) return true;
duke@435 2013
duke@435 2014 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
duke@435 2015 if (chunk->contains(adr)) return true;
duke@435 2016 }
duke@435 2017
duke@435 2018 return false;
duke@435 2019 }
duke@435 2020
duke@435 2021
duke@435 2022 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) {
duke@435 2023 chunk->set_next(monitor_chunks());
duke@435 2024 set_monitor_chunks(chunk);
duke@435 2025 }
duke@435 2026
duke@435 2027 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) {
duke@435 2028 guarantee(monitor_chunks() != NULL, "must be non empty");
duke@435 2029 if (monitor_chunks() == chunk) {
duke@435 2030 set_monitor_chunks(chunk->next());
duke@435 2031 } else {
duke@435 2032 MonitorChunk* prev = monitor_chunks();
duke@435 2033 while (prev->next() != chunk) prev = prev->next();
duke@435 2034 prev->set_next(chunk->next());
duke@435 2035 }
duke@435 2036 }
duke@435 2037
duke@435 2038 // JVM support.
duke@435 2039
duke@435 2040 // Note: this function shouldn't block if it's called in
duke@435 2041 // _thread_in_native_trans state (such as from
duke@435 2042 // check_special_condition_for_native_trans()).
duke@435 2043 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) {
duke@435 2044
duke@435 2045 if (has_last_Java_frame() && has_async_condition()) {
duke@435 2046 // If we are at a polling page safepoint (not a poll return)
duke@435 2047 // then we must defer async exception because live registers
duke@435 2048 // will be clobbered by the exception path. Poll return is
duke@435 2049 // ok because the call we a returning from already collides
duke@435 2050 // with exception handling registers and so there is no issue.
duke@435 2051 // (The exception handling path kills call result registers but
duke@435 2052 // this is ok since the exception kills the result anyway).
duke@435 2053
duke@435 2054 if (is_at_poll_safepoint()) {
duke@435 2055 // if the code we are returning to has deoptimized we must defer
duke@435 2056 // the exception otherwise live registers get clobbered on the
duke@435 2057 // exception path before deoptimization is able to retrieve them.
duke@435 2058 //
duke@435 2059 RegisterMap map(this, false);
duke@435 2060 frame caller_fr = last_frame().sender(&map);
duke@435 2061 assert(caller_fr.is_compiled_frame(), "what?");
duke@435 2062 if (caller_fr.is_deoptimized_frame()) {
duke@435 2063 if (TraceExceptions) {
duke@435 2064 ResourceMark rm;
duke@435 2065 tty->print_cr("deferred async exception at compiled safepoint");
duke@435 2066 }
duke@435 2067 return;
duke@435 2068 }
duke@435 2069 }
duke@435 2070 }
duke@435 2071
duke@435 2072 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition();
duke@435 2073 if (condition == _no_async_condition) {
duke@435 2074 // Conditions have changed since has_special_runtime_exit_condition()
duke@435 2075 // was called:
duke@435 2076 // - if we were here only because of an external suspend request,
duke@435 2077 // then that was taken care of above (or cancelled) so we are done
duke@435 2078 // - if we were here because of another async request, then it has
duke@435 2079 // been cleared between the has_special_runtime_exit_condition()
duke@435 2080 // and now so again we are done
duke@435 2081 return;
duke@435 2082 }
duke@435 2083
duke@435 2084 // Check for pending async. exception
duke@435 2085 if (_pending_async_exception != NULL) {
duke@435 2086 // Only overwrite an already pending exception, if it is not a threadDeath.
never@1577 2087 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) {
duke@435 2088
duke@435 2089 // We cannot call Exceptions::_throw(...) here because we cannot block
duke@435 2090 set_pending_exception(_pending_async_exception, __FILE__, __LINE__);
duke@435 2091
duke@435 2092 if (TraceExceptions) {
duke@435 2093 ResourceMark rm;
duke@435 2094 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this);
duke@435 2095 if (has_last_Java_frame() ) {
duke@435 2096 frame f = last_frame();
duke@435 2097 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp());
duke@435 2098 }
coleenp@4037 2099 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name());
duke@435 2100 }
duke@435 2101 _pending_async_exception = NULL;
duke@435 2102 clear_has_async_exception();
duke@435 2103 }
duke@435 2104 }
duke@435 2105
duke@435 2106 if (check_unsafe_error &&
duke@435 2107 condition == _async_unsafe_access_error && !has_pending_exception()) {
duke@435 2108 condition = _no_async_condition; // done
duke@435 2109 switch (thread_state()) {
duke@435 2110 case _thread_in_vm:
duke@435 2111 {
duke@435 2112 JavaThread* THREAD = this;
duke@435 2113 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
duke@435 2114 }
duke@435 2115 case _thread_in_native:
duke@435 2116 {
duke@435 2117 ThreadInVMfromNative tiv(this);
duke@435 2118 JavaThread* THREAD = this;
duke@435 2119 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
duke@435 2120 }
duke@435 2121 case _thread_in_Java:
duke@435 2122 {
duke@435 2123 ThreadInVMfromJava tiv(this);
duke@435 2124 JavaThread* THREAD = this;
duke@435 2125 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code");
duke@435 2126 }
duke@435 2127 default:
duke@435 2128 ShouldNotReachHere();
duke@435 2129 }
duke@435 2130 }
duke@435 2131
duke@435 2132 assert(condition == _no_async_condition || has_pending_exception() ||
duke@435 2133 (!check_unsafe_error && condition == _async_unsafe_access_error),
duke@435 2134 "must have handled the async condition, if no exception");
duke@435 2135 }
duke@435 2136
duke@435 2137 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) {
duke@435 2138 //
duke@435 2139 // Check for pending external suspend. Internal suspend requests do
duke@435 2140 // not use handle_special_runtime_exit_condition().
duke@435 2141 // If JNIEnv proxies are allowed, don't self-suspend if the target
duke@435 2142 // thread is not the current thread. In older versions of jdbx, jdbx
duke@435 2143 // threads could call into the VM with another thread's JNIEnv so we
duke@435 2144 // can be here operating on behalf of a suspended thread (4432884).
duke@435 2145 bool do_self_suspend = is_external_suspend_with_lock();
duke@435 2146 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) {
duke@435 2147 //
duke@435 2148 // Because thread is external suspended the safepoint code will count
duke@435 2149 // thread as at a safepoint. This can be odd because we can be here
duke@435 2150 // as _thread_in_Java which would normally transition to _thread_blocked
duke@435 2151 // at a safepoint. We would like to mark the thread as _thread_blocked
duke@435 2152 // before calling java_suspend_self like all other callers of it but
duke@435 2153 // we must then observe proper safepoint protocol. (We can't leave
duke@435 2154 // _thread_blocked with a safepoint in progress). However we can be
duke@435 2155 // here as _thread_in_native_trans so we can't use a normal transition
duke@435 2156 // constructor/destructor pair because they assert on that type of
duke@435 2157 // transition. We could do something like:
duke@435 2158 //
duke@435 2159 // JavaThreadState state = thread_state();
duke@435 2160 // set_thread_state(_thread_in_vm);
duke@435 2161 // {
duke@435 2162 // ThreadBlockInVM tbivm(this);
duke@435 2163 // java_suspend_self()
duke@435 2164 // }
duke@435 2165 // set_thread_state(_thread_in_vm_trans);
duke@435 2166 // if (safepoint) block;
duke@435 2167 // set_thread_state(state);
duke@435 2168 //
duke@435 2169 // but that is pretty messy. Instead we just go with the way the
duke@435 2170 // code has worked before and note that this is the only path to
duke@435 2171 // java_suspend_self that doesn't put the thread in _thread_blocked
duke@435 2172 // mode.
duke@435 2173
duke@435 2174 frame_anchor()->make_walkable(this);
duke@435 2175 java_suspend_self();
duke@435 2176
duke@435 2177 // We might be here for reasons in addition to the self-suspend request
duke@435 2178 // so check for other async requests.
duke@435 2179 }
duke@435 2180
duke@435 2181 if (check_asyncs) {
duke@435 2182 check_and_handle_async_exceptions();
duke@435 2183 }
duke@435 2184 }
duke@435 2185
duke@435 2186 void JavaThread::send_thread_stop(oop java_throwable) {
duke@435 2187 assert(Thread::current()->is_VM_thread(), "should be in the vm thread");
duke@435 2188 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code");
duke@435 2189 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
duke@435 2190
duke@435 2191 // Do not throw asynchronous exceptions against the compiler thread
duke@435 2192 // (the compiler thread should not be a Java thread -- fix in 1.4.2)
duke@435 2193 if (is_Compiler_thread()) return;
duke@435 2194
duke@435 2195 {
duke@435 2196 // Actually throw the Throwable against the target Thread - however
duke@435 2197 // only if there is no thread death exception installed already.
never@1577 2198 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) {
duke@435 2199 // If the topmost frame is a runtime stub, then we are calling into
duke@435 2200 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..)
duke@435 2201 // must deoptimize the caller before continuing, as the compiled exception handler table
duke@435 2202 // may not be valid
duke@435 2203 if (has_last_Java_frame()) {
duke@435 2204 frame f = last_frame();
duke@435 2205 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) {
duke@435 2206 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
duke@435 2207 RegisterMap reg_map(this, UseBiasedLocking);
duke@435 2208 frame compiled_frame = f.sender(&reg_map);
kvn@4364 2209 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) {
duke@435 2210 Deoptimization::deoptimize(this, compiled_frame, &reg_map);
duke@435 2211 }
duke@435 2212 }
duke@435 2213 }
duke@435 2214
duke@435 2215 // Set async. pending exception in thread.
duke@435 2216 set_pending_async_exception(java_throwable);
duke@435 2217
duke@435 2218 if (TraceExceptions) {
duke@435 2219 ResourceMark rm;
coleenp@4037 2220 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name());
duke@435 2221 }
duke@435 2222 // for AbortVMOnException flag
coleenp@4037 2223 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name()));
duke@435 2224 }
duke@435 2225 }
duke@435 2226
duke@435 2227
duke@435 2228 // Interrupt thread so it will wake up from a potential wait()
duke@435 2229 Thread::interrupt(this);
duke@435 2230 }
duke@435 2231
duke@435 2232 // External suspension mechanism.
duke@435 2233 //
duke@435 2234 // Tell the VM to suspend a thread when ever it knows that it does not hold on
duke@435 2235 // to any VM_locks and it is at a transition
duke@435 2236 // Self-suspension will happen on the transition out of the vm.
duke@435 2237 // Catch "this" coming in from JNIEnv pointers when the thread has been freed
duke@435 2238 //
duke@435 2239 // Guarantees on return:
duke@435 2240 // + Target thread will not execute any new bytecode (that's why we need to
duke@435 2241 // force a safepoint)
duke@435 2242 // + Target thread will not enter any new monitors
duke@435 2243 //
duke@435 2244 void JavaThread::java_suspend() {
duke@435 2245 { MutexLocker mu(Threads_lock);
duke@435 2246 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) {
duke@435 2247 return;
duke@435 2248 }
duke@435 2249 }
duke@435 2250
duke@435 2251 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
duke@435 2252 if (!is_external_suspend()) {
duke@435 2253 // a racing resume has cancelled us; bail out now
duke@435 2254 return;
duke@435 2255 }
duke@435 2256
duke@435 2257 // suspend is done
duke@435 2258 uint32_t debug_bits = 0;
duke@435 2259 // Warning: is_ext_suspend_completed() may temporarily drop the
duke@435 2260 // SR_lock to allow the thread to reach a stable thread state if
duke@435 2261 // it is currently in a transient thread state.
duke@435 2262 if (is_ext_suspend_completed(false /* !called_by_wait */,
duke@435 2263 SuspendRetryDelay, &debug_bits) ) {
duke@435 2264 return;
duke@435 2265 }
duke@435 2266 }
duke@435 2267
duke@435 2268 VM_ForceSafepoint vm_suspend;
duke@435 2269 VMThread::execute(&vm_suspend);
duke@435 2270 }
duke@435 2271
duke@435 2272 // Part II of external suspension.
duke@435 2273 // A JavaThread self suspends when it detects a pending external suspend
duke@435 2274 // request. This is usually on transitions. It is also done in places
duke@435 2275 // where continuing to the next transition would surprise the caller,
duke@435 2276 // e.g., monitor entry.
duke@435 2277 //
duke@435 2278 // Returns the number of times that the thread self-suspended.
duke@435 2279 //
duke@435 2280 // Note: DO NOT call java_suspend_self() when you just want to block current
duke@435 2281 // thread. java_suspend_self() is the second stage of cooperative
duke@435 2282 // suspension for external suspend requests and should only be used
duke@435 2283 // to complete an external suspend request.
duke@435 2284 //
duke@435 2285 int JavaThread::java_suspend_self() {
duke@435 2286 int ret = 0;
duke@435 2287
duke@435 2288 // we are in the process of exiting so don't suspend
duke@435 2289 if (is_exiting()) {
duke@435 2290 clear_external_suspend();
duke@435 2291 return ret;
duke@435 2292 }
duke@435 2293
duke@435 2294 assert(_anchor.walkable() ||
duke@435 2295 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()),
duke@435 2296 "must have walkable stack");
duke@435 2297
duke@435 2298 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
duke@435 2299
dcubed@1414 2300 assert(!this->is_ext_suspended(),
duke@435 2301 "a thread trying to self-suspend should not already be suspended");
duke@435 2302
duke@435 2303 if (this->is_suspend_equivalent()) {
duke@435 2304 // If we are self-suspending as a result of the lifting of a
duke@435 2305 // suspend equivalent condition, then the suspend_equivalent
duke@435 2306 // flag is not cleared until we set the ext_suspended flag so
duke@435 2307 // that wait_for_ext_suspend_completion() returns consistent
duke@435 2308 // results.
duke@435 2309 this->clear_suspend_equivalent();
duke@435 2310 }
duke@435 2311
duke@435 2312 // A racing resume may have cancelled us before we grabbed SR_lock
duke@435 2313 // above. Or another external suspend request could be waiting for us
duke@435 2314 // by the time we return from SR_lock()->wait(). The thread
duke@435 2315 // that requested the suspension may already be trying to walk our
duke@435 2316 // stack and if we return now, we can change the stack out from under
duke@435 2317 // it. This would be a "bad thing (TM)" and cause the stack walker
duke@435 2318 // to crash. We stay self-suspended until there are no more pending
duke@435 2319 // external suspend requests.
duke@435 2320 while (is_external_suspend()) {
duke@435 2321 ret++;
duke@435 2322 this->set_ext_suspended();
duke@435 2323
duke@435 2324 // _ext_suspended flag is cleared by java_resume()
duke@435 2325 while (is_ext_suspended()) {
duke@435 2326 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag);
duke@435 2327 }
duke@435 2328 }
duke@435 2329
duke@435 2330 return ret;
duke@435 2331 }
duke@435 2332
duke@435 2333 #ifdef ASSERT
duke@435 2334 // verify the JavaThread has not yet been published in the Threads::list, and
duke@435 2335 // hence doesn't need protection from concurrent access at this stage
duke@435 2336 void JavaThread::verify_not_published() {
duke@435 2337 if (!Threads_lock->owned_by_self()) {
duke@435 2338 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
duke@435 2339 assert( !Threads::includes(this),
duke@435 2340 "java thread shouldn't have been published yet!");
duke@435 2341 }
duke@435 2342 else {
duke@435 2343 assert( !Threads::includes(this),
duke@435 2344 "java thread shouldn't have been published yet!");
duke@435 2345 }
duke@435 2346 }
duke@435 2347 #endif
duke@435 2348
duke@435 2349 // Slow path when the native==>VM/Java barriers detect a safepoint is in
duke@435 2350 // progress or when _suspend_flags is non-zero.
duke@435 2351 // Current thread needs to self-suspend if there is a suspend request and/or
duke@435 2352 // block if a safepoint is in progress.
duke@435 2353 // Async exception ISN'T checked.
duke@435 2354 // Note only the ThreadInVMfromNative transition can call this function
duke@435 2355 // directly and when thread state is _thread_in_native_trans
duke@435 2356 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) {
duke@435 2357 assert(thread->thread_state() == _thread_in_native_trans, "wrong state");
duke@435 2358
duke@435 2359 JavaThread *curJT = JavaThread::current();
duke@435 2360 bool do_self_suspend = thread->is_external_suspend();
duke@435 2361
duke@435 2362 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition");
duke@435 2363
duke@435 2364 // If JNIEnv proxies are allowed, don't self-suspend if the target
duke@435 2365 // thread is not the current thread. In older versions of jdbx, jdbx
duke@435 2366 // threads could call into the VM with another thread's JNIEnv so we
duke@435 2367 // can be here operating on behalf of a suspended thread (4432884).
duke@435 2368 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) {
duke@435 2369 JavaThreadState state = thread->thread_state();
duke@435 2370
duke@435 2371 // We mark this thread_blocked state as a suspend-equivalent so
duke@435 2372 // that a caller to is_ext_suspend_completed() won't be confused.
duke@435 2373 // The suspend-equivalent state is cleared by java_suspend_self().
duke@435 2374 thread->set_suspend_equivalent();
duke@435 2375
duke@435 2376 // If the safepoint code sees the _thread_in_native_trans state, it will
duke@435 2377 // wait until the thread changes to other thread state. There is no
duke@435 2378 // guarantee on how soon we can obtain the SR_lock and complete the
duke@435 2379 // self-suspend request. It would be a bad idea to let safepoint wait for
duke@435 2380 // too long. Temporarily change the state to _thread_blocked to
duke@435 2381 // let the VM thread know that this thread is ready for GC. The problem
duke@435 2382 // of changing thread state is that safepoint could happen just after
duke@435 2383 // java_suspend_self() returns after being resumed, and VM thread will
duke@435 2384 // see the _thread_blocked state. We must check for safepoint
duke@435 2385 // after restoring the state and make sure we won't leave while a safepoint
duke@435 2386 // is in progress.
duke@435 2387 thread->set_thread_state(_thread_blocked);
duke@435 2388 thread->java_suspend_self();
duke@435 2389 thread->set_thread_state(state);
duke@435 2390 // Make sure new state is seen by VM thread
duke@435 2391 if (os::is_MP()) {
duke@435 2392 if (UseMembar) {
duke@435 2393 // Force a fence between the write above and read below
duke@435 2394 OrderAccess::fence();
duke@435 2395 } else {
duke@435 2396 // Must use this rather than serialization page in particular on Windows
duke@435 2397 InterfaceSupport::serialize_memory(thread);
duke@435 2398 }
duke@435 2399 }
duke@435 2400 }
duke@435 2401
duke@435 2402 if (SafepointSynchronize::do_call_back()) {
duke@435 2403 // If we are safepointing, then block the caller which may not be
duke@435 2404 // the same as the target thread (see above).
duke@435 2405 SafepointSynchronize::block(curJT);
duke@435 2406 }
duke@435 2407
duke@435 2408 if (thread->is_deopt_suspend()) {
duke@435 2409 thread->clear_deopt_suspend();
duke@435 2410 RegisterMap map(thread, false);
duke@435 2411 frame f = thread->last_frame();
duke@435 2412 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) {
duke@435 2413 f = f.sender(&map);
duke@435 2414 }
duke@435 2415 if (f.id() == thread->must_deopt_id()) {
duke@435 2416 thread->clear_must_deopt_id();
never@2082 2417 f.deoptimize(thread);
duke@435 2418 } else {
duke@435 2419 fatal("missed deoptimization!");
duke@435 2420 }
duke@435 2421 }
duke@435 2422 }
duke@435 2423
duke@435 2424 // Slow path when the native==>VM/Java barriers detect a safepoint is in
duke@435 2425 // progress or when _suspend_flags is non-zero.
duke@435 2426 // Current thread needs to self-suspend if there is a suspend request and/or
duke@435 2427 // block if a safepoint is in progress.
duke@435 2428 // Also check for pending async exception (not including unsafe access error).
duke@435 2429 // Note only the native==>VM/Java barriers can call this function and when
duke@435 2430 // thread state is _thread_in_native_trans.
duke@435 2431 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
duke@435 2432 check_safepoint_and_suspend_for_native_trans(thread);
duke@435 2433
duke@435 2434 if (thread->has_async_exception()) {
duke@435 2435 // We are in _thread_in_native_trans state, don't handle unsafe
duke@435 2436 // access error since that may block.
duke@435 2437 thread->check_and_handle_async_exceptions(false);
duke@435 2438 }
duke@435 2439 }
duke@435 2440
never@3500 2441 // This is a variant of the normal
never@3500 2442 // check_special_condition_for_native_trans with slightly different
never@3500 2443 // semantics for use by critical native wrappers. It does all the
never@3500 2444 // normal checks but also performs the transition back into
never@3500 2445 // thread_in_Java state. This is required so that critical natives
never@3500 2446 // can potentially block and perform a GC if they are the last thread
never@3500 2447 // exiting the GC_locker.
never@3500 2448 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) {
never@3500 2449 check_special_condition_for_native_trans(thread);
never@3500 2450
never@3500 2451 // Finish the transition
never@3500 2452 thread->set_thread_state(_thread_in_Java);
never@3500 2453
never@3500 2454 if (thread->do_critical_native_unlock()) {
never@3500 2455 ThreadInVMfromJavaNoAsyncException tiv(thread);
never@3500 2456 GC_locker::unlock_critical(thread);
never@3500 2457 thread->clear_critical_native_unlock();
never@3500 2458 }
never@3500 2459 }
never@3500 2460
duke@435 2461 // We need to guarantee the Threads_lock here, since resumes are not
duke@435 2462 // allowed during safepoint synchronization
duke@435 2463 // Can only resume from an external suspension
duke@435 2464 void JavaThread::java_resume() {
duke@435 2465 assert_locked_or_safepoint(Threads_lock);
duke@435 2466
duke@435 2467 // Sanity check: thread is gone, has started exiting or the thread
duke@435 2468 // was not externally suspended.
duke@435 2469 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
duke@435 2470 return;
duke@435 2471 }
duke@435 2472
duke@435 2473 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
duke@435 2474
duke@435 2475 clear_external_suspend();
duke@435 2476
duke@435 2477 if (is_ext_suspended()) {
duke@435 2478 clear_ext_suspended();
duke@435 2479 SR_lock()->notify_all();
duke@435 2480 }
duke@435 2481 }
duke@435 2482
duke@435 2483 void JavaThread::create_stack_guard_pages() {
duke@435 2484 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return;
duke@435 2485 address low_addr = stack_base() - stack_size();
duke@435 2486 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
duke@435 2487
duke@435 2488 int allocate = os::allocate_stack_guard_pages();
duke@435 2489 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
duke@435 2490
coleenp@1755 2491 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) {
duke@435 2492 warning("Attempt to allocate stack guard pages failed.");
duke@435 2493 return;
duke@435 2494 }
duke@435 2495
duke@435 2496 if (os::guard_memory((char *) low_addr, len)) {
duke@435 2497 _stack_guard_state = stack_guard_enabled;
duke@435 2498 } else {
duke@435 2499 warning("Attempt to protect stack guard pages failed.");
duke@435 2500 if (os::uncommit_memory((char *) low_addr, len)) {
duke@435 2501 warning("Attempt to deallocate stack guard pages failed.");
duke@435 2502 }
duke@435 2503 }
duke@435 2504 }
duke@435 2505
duke@435 2506 void JavaThread::remove_stack_guard_pages() {
zgu@4193 2507 assert(Thread::current() == this, "from different thread");
duke@435 2508 if (_stack_guard_state == stack_guard_unused) return;
duke@435 2509 address low_addr = stack_base() - stack_size();
duke@435 2510 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
duke@435 2511
duke@435 2512 if (os::allocate_stack_guard_pages()) {
coleenp@1755 2513 if (os::remove_stack_guard_pages((char *) low_addr, len)) {
duke@435 2514 _stack_guard_state = stack_guard_unused;
duke@435 2515 } else {
duke@435 2516 warning("Attempt to deallocate stack guard pages failed.");
duke@435 2517 }
duke@435 2518 } else {
duke@435 2519 if (_stack_guard_state == stack_guard_unused) return;
duke@435 2520 if (os::unguard_memory((char *) low_addr, len)) {
duke@435 2521 _stack_guard_state = stack_guard_unused;
duke@435 2522 } else {
duke@435 2523 warning("Attempt to unprotect stack guard pages failed.");
duke@435 2524 }
duke@435 2525 }
duke@435 2526 }
duke@435 2527
duke@435 2528 void JavaThread::enable_stack_yellow_zone() {
duke@435 2529 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
duke@435 2530 assert(_stack_guard_state != stack_guard_enabled, "already enabled");
duke@435 2531
duke@435 2532 // The base notation is from the stacks point of view, growing downward.
duke@435 2533 // We need to adjust it to work correctly with guard_memory()
duke@435 2534 address base = stack_yellow_zone_base() - stack_yellow_zone_size();
duke@435 2535
duke@435 2536 guarantee(base < stack_base(),"Error calculating stack yellow zone");
duke@435 2537 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone");
duke@435 2538
duke@435 2539 if (os::guard_memory((char *) base, stack_yellow_zone_size())) {
duke@435 2540 _stack_guard_state = stack_guard_enabled;
duke@435 2541 } else {
duke@435 2542 warning("Attempt to guard stack yellow zone failed.");
duke@435 2543 }
duke@435 2544 enable_register_stack_guard();
duke@435 2545 }
duke@435 2546
duke@435 2547 void JavaThread::disable_stack_yellow_zone() {
duke@435 2548 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
duke@435 2549 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled");
duke@435 2550
duke@435 2551 // Simply return if called for a thread that does not use guard pages.
duke@435 2552 if (_stack_guard_state == stack_guard_unused) return;
duke@435 2553
duke@435 2554 // The base notation is from the stacks point of view, growing downward.
duke@435 2555 // We need to adjust it to work correctly with guard_memory()
duke@435 2556 address base = stack_yellow_zone_base() - stack_yellow_zone_size();
duke@435 2557
duke@435 2558 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) {
duke@435 2559 _stack_guard_state = stack_guard_yellow_disabled;
duke@435 2560 } else {
duke@435 2561 warning("Attempt to unguard stack yellow zone failed.");
duke@435 2562 }
duke@435 2563 disable_register_stack_guard();
duke@435 2564 }
duke@435 2565
duke@435 2566 void JavaThread::enable_stack_red_zone() {
duke@435 2567 // The base notation is from the stacks point of view, growing downward.
duke@435 2568 // We need to adjust it to work correctly with guard_memory()
duke@435 2569 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
duke@435 2570 address base = stack_red_zone_base() - stack_red_zone_size();
duke@435 2571
duke@435 2572 guarantee(base < stack_base(),"Error calculating stack red zone");
duke@435 2573 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone");
duke@435 2574
duke@435 2575 if(!os::guard_memory((char *) base, stack_red_zone_size())) {
duke@435 2576 warning("Attempt to guard stack red zone failed.");
duke@435 2577 }
duke@435 2578 }
duke@435 2579
duke@435 2580 void JavaThread::disable_stack_red_zone() {
duke@435 2581 // The base notation is from the stacks point of view, growing downward.
duke@435 2582 // We need to adjust it to work correctly with guard_memory()
duke@435 2583 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
duke@435 2584 address base = stack_red_zone_base() - stack_red_zone_size();
duke@435 2585 if (!os::unguard_memory((char *)base, stack_red_zone_size())) {
duke@435 2586 warning("Attempt to unguard stack red zone failed.");
duke@435 2587 }
duke@435 2588 }
duke@435 2589
duke@435 2590 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) {
duke@435 2591 // ignore is there is no stack
duke@435 2592 if (!has_last_Java_frame()) return;
duke@435 2593 // traverse the stack frames. Starts from top frame.
duke@435 2594 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
duke@435 2595 frame* fr = fst.current();
duke@435 2596 f(fr, fst.register_map());
duke@435 2597 }
duke@435 2598 }
duke@435 2599
duke@435 2600
duke@435 2601 #ifndef PRODUCT
duke@435 2602 // Deoptimization
duke@435 2603 // Function for testing deoptimization
duke@435 2604 void JavaThread::deoptimize() {
duke@435 2605 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
duke@435 2606 StackFrameStream fst(this, UseBiasedLocking);
duke@435 2607 bool deopt = false; // Dump stack only if a deopt actually happens.
duke@435 2608 bool only_at = strlen(DeoptimizeOnlyAt) > 0;
duke@435 2609 // Iterate over all frames in the thread and deoptimize
duke@435 2610 for(; !fst.is_done(); fst.next()) {
duke@435 2611 if(fst.current()->can_be_deoptimized()) {
duke@435 2612
duke@435 2613 if (only_at) {
duke@435 2614 // Deoptimize only at particular bcis. DeoptimizeOnlyAt
duke@435 2615 // consists of comma or carriage return separated numbers so
duke@435 2616 // search for the current bci in that string.
duke@435 2617 address pc = fst.current()->pc();
duke@435 2618 nmethod* nm = (nmethod*) fst.current()->cb();
duke@435 2619 ScopeDesc* sd = nm->scope_desc_at( pc);
duke@435 2620 char buffer[8];
duke@435 2621 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci());
duke@435 2622 size_t len = strlen(buffer);
duke@435 2623 const char * found = strstr(DeoptimizeOnlyAt, buffer);
duke@435 2624 while (found != NULL) {
duke@435 2625 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') &&
duke@435 2626 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) {
duke@435 2627 // Check that the bci found is bracketed by terminators.
duke@435 2628 break;
duke@435 2629 }
duke@435 2630 found = strstr(found + 1, buffer);
duke@435 2631 }
duke@435 2632 if (!found) {
duke@435 2633 continue;
duke@435 2634 }
duke@435 2635 }
duke@435 2636
duke@435 2637 if (DebugDeoptimization && !deopt) {
duke@435 2638 deopt = true; // One-time only print before deopt
duke@435 2639 tty->print_cr("[BEFORE Deoptimization]");
duke@435 2640 trace_frames();
duke@435 2641 trace_stack();
duke@435 2642 }
duke@435 2643 Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
duke@435 2644 }
duke@435 2645 }
duke@435 2646
duke@435 2647 if (DebugDeoptimization && deopt) {
duke@435 2648 tty->print_cr("[AFTER Deoptimization]");
duke@435 2649 trace_frames();
duke@435 2650 }
duke@435 2651 }
duke@435 2652
duke@435 2653
duke@435 2654 // Make zombies
duke@435 2655 void JavaThread::make_zombies() {
duke@435 2656 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
duke@435 2657 if (fst.current()->can_be_deoptimized()) {
duke@435 2658 // it is a Java nmethod
duke@435 2659 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc());
duke@435 2660 nm->make_not_entrant();
duke@435 2661 }
duke@435 2662 }
duke@435 2663 }
duke@435 2664 #endif // PRODUCT
duke@435 2665
duke@435 2666
duke@435 2667 void JavaThread::deoptimized_wrt_marked_nmethods() {
duke@435 2668 if (!has_last_Java_frame()) return;
duke@435 2669 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
duke@435 2670 StackFrameStream fst(this, UseBiasedLocking);
duke@435 2671 for(; !fst.is_done(); fst.next()) {
duke@435 2672 if (fst.current()->should_be_deoptimized()) {
vlivanov@4154 2673 if (LogCompilation && xtty != NULL) {
vlivanov@4154 2674 nmethod* nm = fst.current()->cb()->as_nmethod_or_null();
vlivanov@4154 2675 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'",
vlivanov@4154 2676 this->name(), nm != NULL ? nm->compile_id() : -1);
vlivanov@4154 2677 }
vlivanov@4154 2678
duke@435 2679 Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
duke@435 2680 }
duke@435 2681 }
duke@435 2682 }
duke@435 2683
duke@435 2684
duke@435 2685 // GC support
duke@435 2686 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); }
duke@435 2687
duke@435 2688 void JavaThread::gc_epilogue() {
duke@435 2689 frames_do(frame_gc_epilogue);
duke@435 2690 }
duke@435 2691
duke@435 2692
duke@435 2693 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); }
duke@435 2694
duke@435 2695 void JavaThread::gc_prologue() {
duke@435 2696 frames_do(frame_gc_prologue);
duke@435 2697 }
duke@435 2698
minqi@1554 2699 // If the caller is a NamedThread, then remember, in the current scope,
minqi@1554 2700 // the given JavaThread in its _processed_thread field.
minqi@1554 2701 class RememberProcessedThread: public StackObj {
minqi@1554 2702 NamedThread* _cur_thr;
minqi@1554 2703 public:
minqi@1554 2704 RememberProcessedThread(JavaThread* jthr) {
minqi@1554 2705 Thread* thread = Thread::current();
minqi@1554 2706 if (thread->is_Named_thread()) {
minqi@1554 2707 _cur_thr = (NamedThread *)thread;
minqi@1554 2708 _cur_thr->set_processed_thread(jthr);
minqi@1554 2709 } else {
minqi@1554 2710 _cur_thr = NULL;
minqi@1554 2711 }
minqi@1554 2712 }
minqi@1554 2713
minqi@1554 2714 ~RememberProcessedThread() {
minqi@1554 2715 if (_cur_thr) {
minqi@1554 2716 _cur_thr->set_processed_thread(NULL);
minqi@1554 2717 }
minqi@1554 2718 }
minqi@1554 2719 };
duke@435 2720
stefank@6973 2721 void JavaThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) {
ysr@1601 2722 // Verify that the deferred card marks have been flushed.
ysr@1601 2723 assert(deferred_card_mark().is_empty(), "Should be empty during GC");
ysr@1462 2724
duke@435 2725 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do
duke@435 2726 // since there may be more than one thread using each ThreadProfiler.
duke@435 2727
duke@435 2728 // Traverse the GCHandles
stefank@4298 2729 Thread::oops_do(f, cld_f, cf);
duke@435 2730
duke@435 2731 assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
duke@435 2732 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
duke@435 2733
duke@435 2734 if (has_last_Java_frame()) {
minqi@1554 2735 // Record JavaThread to GC thread
minqi@1554 2736 RememberProcessedThread rpt(this);
duke@435 2737
duke@435 2738 // Traverse the privileged stack
duke@435 2739 if (_privileged_stack_top != NULL) {
duke@435 2740 _privileged_stack_top->oops_do(f);
duke@435 2741 }
duke@435 2742
duke@435 2743 // traverse the registered growable array
duke@435 2744 if (_array_for_gc != NULL) {
duke@435 2745 for (int index = 0; index < _array_for_gc->length(); index++) {
duke@435 2746 f->do_oop(_array_for_gc->adr_at(index));
duke@435 2747 }
duke@435 2748 }
duke@435 2749
duke@435 2750 // Traverse the monitor chunks
duke@435 2751 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
duke@435 2752 chunk->oops_do(f);
duke@435 2753 }
duke@435 2754
duke@435 2755 // Traverse the execution stack
duke@435 2756 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
stefank@4298 2757 fst.current()->oops_do(f, cld_f, cf, fst.register_map());
duke@435 2758 }
duke@435 2759 }
duke@435 2760
duke@435 2761 // callee_target is never live across a gc point so NULL it here should
duke@435 2762 // it still contain a methdOop.
duke@435 2763
duke@435 2764 set_callee_target(NULL);
duke@435 2765
duke@435 2766 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!");
duke@435 2767 // If we have deferred set_locals there might be oops waiting to be
duke@435 2768 // written
duke@435 2769 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals();
duke@435 2770 if (list != NULL) {
duke@435 2771 for (int i = 0; i < list->length(); i++) {
duke@435 2772 list->at(i)->oops_do(f);
duke@435 2773 }
duke@435 2774 }
duke@435 2775
duke@435 2776 // Traverse instance variables at the end since the GC may be moving things
duke@435 2777 // around using this function
duke@435 2778 f->do_oop((oop*) &_threadObj);
duke@435 2779 f->do_oop((oop*) &_vm_result);
duke@435 2780 f->do_oop((oop*) &_exception_oop);
duke@435 2781 f->do_oop((oop*) &_pending_async_exception);
duke@435 2782
duke@435 2783 if (jvmti_thread_state() != NULL) {
duke@435 2784 jvmti_thread_state()->oops_do(f);
duke@435 2785 }
duke@435 2786 }
duke@435 2787
jrose@1424 2788 void JavaThread::nmethods_do(CodeBlobClosure* cf) {
jrose@1424 2789 Thread::nmethods_do(cf); // (super method is a no-op)
duke@435 2790
duke@435 2791 assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
duke@435 2792 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
duke@435 2793
duke@435 2794 if (has_last_Java_frame()) {
duke@435 2795 // Traverse the execution stack
duke@435 2796 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
jrose@1424 2797 fst.current()->nmethods_do(cf);
duke@435 2798 }
duke@435 2799 }
duke@435 2800 }
duke@435 2801
coleenp@4037 2802 void JavaThread::metadata_do(void f(Metadata*)) {
coleenp@4037 2803 Thread::metadata_do(f);
coleenp@4037 2804 if (has_last_Java_frame()) {
coleenp@4037 2805 // Traverse the execution stack to call f() on the methods in the stack
coleenp@4037 2806 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
coleenp@4037 2807 fst.current()->metadata_do(f);
coleenp@4037 2808 }
coleenp@4037 2809 } else if (is_Compiler_thread()) {
coleenp@4037 2810 // need to walk ciMetadata in current compile tasks to keep alive.
coleenp@4037 2811 CompilerThread* ct = (CompilerThread*)this;
coleenp@4037 2812 if (ct->env() != NULL) {
coleenp@4037 2813 ct->env()->metadata_do(f);
coleenp@4037 2814 }
coleenp@4037 2815 }
coleenp@4037 2816 }
coleenp@4037 2817
duke@435 2818 // Printing
duke@435 2819 const char* _get_thread_state_name(JavaThreadState _thread_state) {
duke@435 2820 switch (_thread_state) {
duke@435 2821 case _thread_uninitialized: return "_thread_uninitialized";
duke@435 2822 case _thread_new: return "_thread_new";
duke@435 2823 case _thread_new_trans: return "_thread_new_trans";
duke@435 2824 case _thread_in_native: return "_thread_in_native";
duke@435 2825 case _thread_in_native_trans: return "_thread_in_native_trans";
duke@435 2826 case _thread_in_vm: return "_thread_in_vm";
duke@435 2827 case _thread_in_vm_trans: return "_thread_in_vm_trans";
duke@435 2828 case _thread_in_Java: return "_thread_in_Java";
duke@435 2829 case _thread_in_Java_trans: return "_thread_in_Java_trans";
duke@435 2830 case _thread_blocked: return "_thread_blocked";
duke@435 2831 case _thread_blocked_trans: return "_thread_blocked_trans";
duke@435 2832 default: return "unknown thread state";
duke@435 2833 }
duke@435 2834 }
duke@435 2835
duke@435 2836 #ifndef PRODUCT
duke@435 2837 void JavaThread::print_thread_state_on(outputStream *st) const {
duke@435 2838 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state));
duke@435 2839 };
duke@435 2840 void JavaThread::print_thread_state() const {
duke@435 2841 print_thread_state_on(tty);
duke@435 2842 };
duke@435 2843 #endif // PRODUCT
duke@435 2844
duke@435 2845 // Called by Threads::print() for VM_PrintThreads operation
duke@435 2846 void JavaThread::print_on(outputStream *st) const {
duke@435 2847 st->print("\"%s\" ", get_thread_name());
duke@435 2848 oop thread_oop = threadObj();
dholmes@4077 2849 if (thread_oop != NULL) {
dholmes@4077 2850 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop));
dholmes@4077 2851 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon ");
dholmes@4077 2852 st->print("prio=%d ", java_lang_Thread::priority(thread_oop));
dholmes@4077 2853 }
duke@435 2854 Thread::print_on(st);
duke@435 2855 // print guess for valid stack memory region (assume 4K pages); helps lock debugging
xlu@1137 2856 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12));
duke@435 2857 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) {
duke@435 2858 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop));
duke@435 2859 }
duke@435 2860 #ifndef PRODUCT
duke@435 2861 print_thread_state_on(st);
duke@435 2862 _safepoint_state->print_on(st);
duke@435 2863 #endif // PRODUCT
duke@435 2864 }
duke@435 2865
duke@435 2866 // Called by fatal error handler. The difference between this and
duke@435 2867 // JavaThread::print() is that we can't grab lock or allocate memory.
duke@435 2868 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const {
duke@435 2869 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen));
duke@435 2870 oop thread_obj = threadObj();
duke@435 2871 if (thread_obj != NULL) {
duke@435 2872 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon");
duke@435 2873 }
duke@435 2874 st->print(" [");
duke@435 2875 st->print("%s", _get_thread_state_name(_thread_state));
duke@435 2876 if (osthread()) {
duke@435 2877 st->print(", id=%d", osthread()->thread_id());
duke@435 2878 }
duke@435 2879 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")",
duke@435 2880 _stack_base - _stack_size, _stack_base);
duke@435 2881 st->print("]");
duke@435 2882 return;
duke@435 2883 }
duke@435 2884
duke@435 2885 // Verification
duke@435 2886
duke@435 2887 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); }
duke@435 2888
duke@435 2889 void JavaThread::verify() {
duke@435 2890 // Verify oops in the thread.
stefank@4298 2891 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL);
duke@435 2892
duke@435 2893 // Verify the stack frames.
duke@435 2894 frames_do(frame_verify);
duke@435 2895 }
duke@435 2896
duke@435 2897 // CR 6300358 (sub-CR 2137150)
duke@435 2898 // Most callers of this method assume that it can't return NULL but a
duke@435 2899 // thread may not have a name whilst it is in the process of attaching to
duke@435 2900 // the VM - see CR 6412693, and there are places where a JavaThread can be
duke@435 2901 // seen prior to having it's threadObj set (eg JNI attaching threads and
duke@435 2902 // if vm exit occurs during initialization). These cases can all be accounted
duke@435 2903 // for such that this method never returns NULL.
duke@435 2904 const char* JavaThread::get_thread_name() const {
duke@435 2905 #ifdef ASSERT
duke@435 2906 // early safepoints can hit while current thread does not yet have TLS
duke@435 2907 if (!SafepointSynchronize::is_at_safepoint()) {
duke@435 2908 Thread *cur = Thread::current();
duke@435 2909 if (!(cur->is_Java_thread() && cur == this)) {
duke@435 2910 // Current JavaThreads are allowed to get their own name without
duke@435 2911 // the Threads_lock.
duke@435 2912 assert_locked_or_safepoint(Threads_lock);
duke@435 2913 }
duke@435 2914 }
duke@435 2915 #endif // ASSERT
duke@435 2916 return get_thread_name_string();
duke@435 2917 }
duke@435 2918
duke@435 2919 // Returns a non-NULL representation of this thread's name, or a suitable
duke@435 2920 // descriptive string if there is no set name
duke@435 2921 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const {
duke@435 2922 const char* name_str;
duke@435 2923 oop thread_obj = threadObj();
duke@435 2924 if (thread_obj != NULL) {
duke@435 2925 typeArrayOop name = java_lang_Thread::name(thread_obj);
duke@435 2926 if (name != NULL) {
duke@435 2927 if (buf == NULL) {
duke@435 2928 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
duke@435 2929 }
duke@435 2930 else {
duke@435 2931 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen);
duke@435 2932 }
duke@435 2933 }
dcubed@3202 2934 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306
duke@435 2935 name_str = "<no-name - thread is attaching>";
duke@435 2936 }
duke@435 2937 else {
duke@435 2938 name_str = Thread::name();
duke@435 2939 }
duke@435 2940 }
duke@435 2941 else {
duke@435 2942 name_str = Thread::name();
duke@435 2943 }
duke@435 2944 assert(name_str != NULL, "unexpected NULL thread name");
duke@435 2945 return name_str;
duke@435 2946 }
duke@435 2947
duke@435 2948
duke@435 2949 const char* JavaThread::get_threadgroup_name() const {
duke@435 2950 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
duke@435 2951 oop thread_obj = threadObj();
duke@435 2952 if (thread_obj != NULL) {
duke@435 2953 oop thread_group = java_lang_Thread::threadGroup(thread_obj);
duke@435 2954 if (thread_group != NULL) {
duke@435 2955 typeArrayOop name = java_lang_ThreadGroup::name(thread_group);
duke@435 2956 // ThreadGroup.name can be null
duke@435 2957 if (name != NULL) {
duke@435 2958 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
duke@435 2959 return str;
duke@435 2960 }
duke@435 2961 }
duke@435 2962 }
duke@435 2963 return NULL;
duke@435 2964 }
duke@435 2965
duke@435 2966 const char* JavaThread::get_parent_name() const {
duke@435 2967 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
duke@435 2968 oop thread_obj = threadObj();
duke@435 2969 if (thread_obj != NULL) {
duke@435 2970 oop thread_group = java_lang_Thread::threadGroup(thread_obj);
duke@435 2971 if (thread_group != NULL) {
duke@435 2972 oop parent = java_lang_ThreadGroup::parent(thread_group);
duke@435 2973 if (parent != NULL) {
duke@435 2974 typeArrayOop name = java_lang_ThreadGroup::name(parent);
duke@435 2975 // ThreadGroup.name can be null
duke@435 2976 if (name != NULL) {
duke@435 2977 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
duke@435 2978 return str;
duke@435 2979 }
duke@435 2980 }
duke@435 2981 }
duke@435 2982 }
duke@435 2983 return NULL;
duke@435 2984 }
duke@435 2985
duke@435 2986 ThreadPriority JavaThread::java_priority() const {
duke@435 2987 oop thr_oop = threadObj();
duke@435 2988 if (thr_oop == NULL) return NormPriority; // Bootstrapping
duke@435 2989 ThreadPriority priority = java_lang_Thread::priority(thr_oop);
duke@435 2990 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
duke@435 2991 return priority;
duke@435 2992 }
duke@435 2993
duke@435 2994 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) {
duke@435 2995
duke@435 2996 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
duke@435 2997 // Link Java Thread object <-> C++ Thread
duke@435 2998
duke@435 2999 // Get the C++ thread object (an oop) from the JNI handle (a jthread)
duke@435 3000 // and put it into a new Handle. The Handle "thread_oop" can then
duke@435 3001 // be used to pass the C++ thread object to other methods.
duke@435 3002
duke@435 3003 // Set the Java level thread object (jthread) field of the
duke@435 3004 // new thread (a JavaThread *) to C++ thread object using the
duke@435 3005 // "thread_oop" handle.
duke@435 3006
duke@435 3007 // Set the thread field (a JavaThread *) of the
duke@435 3008 // oop representing the java_lang_Thread to the new thread (a JavaThread *).
duke@435 3009
duke@435 3010 Handle thread_oop(Thread::current(),
duke@435 3011 JNIHandles::resolve_non_null(jni_thread));
coleenp@4037 3012 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(),
duke@435 3013 "must be initialized");
duke@435 3014 set_threadObj(thread_oop());
duke@435 3015 java_lang_Thread::set_thread(thread_oop(), this);
duke@435 3016
duke@435 3017 if (prio == NoPriority) {
duke@435 3018 prio = java_lang_Thread::priority(thread_oop());
duke@435 3019 assert(prio != NoPriority, "A valid priority should be present");
duke@435 3020 }
duke@435 3021
duke@435 3022 // Push the Java priority down to the native thread; needs Threads_lock
duke@435 3023 Thread::set_priority(this, prio);
duke@435 3024
sla@7107 3025 prepare_ext();
sla@7107 3026
duke@435 3027 // Add the new thread to the Threads list and set it in motion.
duke@435 3028 // We must have threads lock in order to call Threads::add.
duke@435 3029 // It is crucial that we do not block before the thread is
duke@435 3030 // added to the Threads list for if a GC happens, then the java_thread oop
duke@435 3031 // will not be visited by GC.
duke@435 3032 Threads::add(this);
duke@435 3033 }
duke@435 3034
duke@435 3035 oop JavaThread::current_park_blocker() {
duke@435 3036 // Support for JSR-166 locks
duke@435 3037 oop thread_oop = threadObj();
kamg@677 3038 if (thread_oop != NULL &&
kamg@677 3039 JDK_Version::current().supports_thread_park_blocker()) {
duke@435 3040 return java_lang_Thread::park_blocker(thread_oop);
duke@435 3041 }
duke@435 3042 return NULL;
duke@435 3043 }
duke@435 3044
duke@435 3045
duke@435 3046 void JavaThread::print_stack_on(outputStream* st) {
duke@435 3047 if (!has_last_Java_frame()) return;
duke@435 3048 ResourceMark rm;
duke@435 3049 HandleMark hm;
duke@435 3050
duke@435 3051 RegisterMap reg_map(this);
duke@435 3052 vframe* start_vf = last_java_vframe(&reg_map);
duke@435 3053 int count = 0;
duke@435 3054 for (vframe* f = start_vf; f; f = f->sender() ) {
duke@435 3055 if (f->is_java_frame()) {
duke@435 3056 javaVFrame* jvf = javaVFrame::cast(f);
duke@435 3057 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci());
duke@435 3058
duke@435 3059 // Print out lock information
duke@435 3060 if (JavaMonitorsInStackTrace) {
duke@435 3061 jvf->print_lock_info_on(st, count);
duke@435 3062 }
duke@435 3063 } else {
duke@435 3064 // Ignore non-Java frames
duke@435 3065 }
duke@435 3066
duke@435 3067 // Bail-out case for too deep stacks
duke@435 3068 count++;
duke@435 3069 if (MaxJavaStackTraceDepth == count) return;
duke@435 3070 }
duke@435 3071 }
duke@435 3072
duke@435 3073
duke@435 3074 // JVMTI PopFrame support
duke@435 3075 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) {
duke@435 3076 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments");
duke@435 3077 if (in_bytes(size_in_bytes) != 0) {
zgu@3900 3078 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread);
duke@435 3079 _popframe_preserved_args_size = in_bytes(size_in_bytes);
kvn@1958 3080 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size);
duke@435 3081 }
duke@435 3082 }
duke@435 3083
duke@435 3084 void* JavaThread::popframe_preserved_args() {
duke@435 3085 return _popframe_preserved_args;
duke@435 3086 }
duke@435 3087
duke@435 3088 ByteSize JavaThread::popframe_preserved_args_size() {
duke@435 3089 return in_ByteSize(_popframe_preserved_args_size);
duke@435 3090 }
duke@435 3091
duke@435 3092 WordSize JavaThread::popframe_preserved_args_size_in_words() {
duke@435 3093 int sz = in_bytes(popframe_preserved_args_size());
duke@435 3094 assert(sz % wordSize == 0, "argument size must be multiple of wordSize");
duke@435 3095 return in_WordSize(sz / wordSize);
duke@435 3096 }
duke@435 3097
duke@435 3098 void JavaThread::popframe_free_preserved_args() {
duke@435 3099 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice");
zgu@3900 3100 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread);
duke@435 3101 _popframe_preserved_args = NULL;
duke@435 3102 _popframe_preserved_args_size = 0;
duke@435 3103 }
duke@435 3104
duke@435 3105 #ifndef PRODUCT
duke@435 3106
duke@435 3107 void JavaThread::trace_frames() {
duke@435 3108 tty->print_cr("[Describe stack]");
duke@435 3109 int frame_no = 1;
duke@435 3110 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
duke@435 3111 tty->print(" %d. ", frame_no++);
duke@435 3112 fst.current()->print_value_on(tty,this);
duke@435 3113 tty->cr();
duke@435 3114 }
duke@435 3115 }
duke@435 3116
never@3108 3117 class PrintAndVerifyOopClosure: public OopClosure {
never@3108 3118 protected:
never@3108 3119 template <class T> inline void do_oop_work(T* p) {
never@3108 3120 oop obj = oopDesc::load_decode_heap_oop(p);
never@3108 3121 if (obj == NULL) return;
never@3108 3122 tty->print(INTPTR_FORMAT ": ", p);
never@3108 3123 if (obj->is_oop_or_null()) {
never@3108 3124 if (obj->is_objArray()) {
never@3108 3125 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj);
never@3108 3126 } else {
never@3108 3127 obj->print();
never@3108 3128 }
never@3108 3129 } else {
never@3108 3130 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj);
never@3108 3131 }
never@3108 3132 tty->cr();
never@3108 3133 }
never@3108 3134 public:
never@3108 3135 virtual void do_oop(oop* p) { do_oop_work(p); }
never@3108 3136 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
never@3108 3137 };
never@3108 3138
never@3108 3139
never@3108 3140 static void oops_print(frame* f, const RegisterMap *map) {
never@3108 3141 PrintAndVerifyOopClosure print;
never@3108 3142 f->print_value();
stefank@4298 3143 f->oops_do(&print, NULL, NULL, (RegisterMap*)map);
never@3108 3144 }
never@3108 3145
never@3108 3146 // Print our all the locations that contain oops and whether they are
never@3108 3147 // valid or not. This useful when trying to find the oldest frame
never@3108 3148 // where an oop has gone bad since the frame walk is from youngest to
never@3108 3149 // oldest.
never@3108 3150 void JavaThread::trace_oops() {
never@3108 3151 tty->print_cr("[Trace oops]");
never@3108 3152 frames_do(oops_print);
never@3108 3153 }
never@3108 3154
duke@435 3155
never@2920 3156 #ifdef ASSERT
never@2868 3157 // Print or validate the layout of stack frames
never@2868 3158 void JavaThread::print_frame_layout(int depth, bool validate_only) {
never@2868 3159 ResourceMark rm;
never@2868 3160 PRESERVE_EXCEPTION_MARK;
never@2868 3161 FrameValues values;
never@2868 3162 int frame_no = 0;
never@2868 3163 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) {
never@2868 3164 fst.current()->describe(values, ++frame_no);
never@2868 3165 if (depth == frame_no) break;
never@2868 3166 }
never@2868 3167 if (validate_only) {
never@2868 3168 values.validate();
never@2868 3169 } else {
never@2868 3170 tty->print_cr("[Describe stack layout]");
twisti@3238 3171 values.print(this);
never@2868 3172 }
never@2868 3173 }
never@2920 3174 #endif
never@2868 3175
duke@435 3176 void JavaThread::trace_stack_from(vframe* start_vf) {
duke@435 3177 ResourceMark rm;
duke@435 3178 int vframe_no = 1;
duke@435 3179 for (vframe* f = start_vf; f; f = f->sender() ) {
duke@435 3180 if (f->is_java_frame()) {
duke@435 3181 javaVFrame::cast(f)->print_activation(vframe_no++);
duke@435 3182 } else {
duke@435 3183 f->print();
duke@435 3184 }
duke@435 3185 if (vframe_no > StackPrintLimit) {
duke@435 3186 tty->print_cr("...<more frames>...");
duke@435 3187 return;
duke@435 3188 }
duke@435 3189 }
duke@435 3190 }
duke@435 3191
duke@435 3192
duke@435 3193 void JavaThread::trace_stack() {
duke@435 3194 if (!has_last_Java_frame()) return;
duke@435 3195 ResourceMark rm;
duke@435 3196 HandleMark hm;
duke@435 3197 RegisterMap reg_map(this);
duke@435 3198 trace_stack_from(last_java_vframe(&reg_map));
duke@435 3199 }
duke@435 3200
duke@435 3201
duke@435 3202 #endif // PRODUCT
duke@435 3203
duke@435 3204
duke@435 3205 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) {
duke@435 3206 assert(reg_map != NULL, "a map must be given");
duke@435 3207 frame f = last_frame();
duke@435 3208 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) {
duke@435 3209 if (vf->is_java_frame()) return javaVFrame::cast(vf);
duke@435 3210 }
duke@435 3211 return NULL;
duke@435 3212 }
duke@435 3213
duke@435 3214
coleenp@4037 3215 Klass* JavaThread::security_get_caller_class(int depth) {
duke@435 3216 vframeStream vfst(this);
duke@435 3217 vfst.security_get_caller_frame(depth);
duke@435 3218 if (!vfst.at_end()) {
duke@435 3219 return vfst.method()->method_holder();
duke@435 3220 }
duke@435 3221 return NULL;
duke@435 3222 }
duke@435 3223
duke@435 3224 static void compiler_thread_entry(JavaThread* thread, TRAPS) {
duke@435 3225 assert(thread->is_Compiler_thread(), "must be compiler thread");
duke@435 3226 CompileBroker::compiler_thread_loop();
duke@435 3227 }
duke@435 3228
duke@435 3229 // Create a CompilerThread
duke@435 3230 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters)
duke@435 3231 : JavaThread(&compiler_thread_entry) {
duke@435 3232 _env = NULL;
duke@435 3233 _log = NULL;
duke@435 3234 _task = NULL;
duke@435 3235 _queue = queue;
duke@435 3236 _counters = counters;
iveresov@1939 3237 _buffer_blob = NULL;
never@2916 3238 _scanned_nmethod = NULL;
anoll@5919 3239 _compiler = NULL;
duke@435 3240
duke@435 3241 #ifndef PRODUCT
duke@435 3242 _ideal_graph_printer = NULL;
duke@435 3243 #endif
duke@435 3244 }
duke@435 3245
stefank@6973 3246 void CompilerThread::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) {
stefank@4298 3247 JavaThread::oops_do(f, cld_f, cf);
never@2916 3248 if (_scanned_nmethod != NULL && cf != NULL) {
never@2916 3249 // Safepoints can occur when the sweeper is scanning an nmethod so
never@2916 3250 // process it here to make sure it isn't unloaded in the middle of
never@2916 3251 // a scan.
never@2916 3252 cf->do_code_blob(_scanned_nmethod);
never@2916 3253 }
never@2916 3254 }
duke@435 3255
anoll@5919 3256
duke@435 3257 // ======= Threads ========
duke@435 3258
duke@435 3259 // The Threads class links together all active threads, and provides
duke@435 3260 // operations over all threads. It is protected by its own Mutex
duke@435 3261 // lock, which is also used in other contexts to protect thread
duke@435 3262 // operations from having the thread being operated on from exiting
duke@435 3263 // and going away unexpectedly (e.g., safepoint synchronization)
duke@435 3264
duke@435 3265 JavaThread* Threads::_thread_list = NULL;
duke@435 3266 int Threads::_number_of_threads = 0;
duke@435 3267 int Threads::_number_of_non_daemon_threads = 0;
duke@435 3268 int Threads::_return_code = 0;
duke@435 3269 size_t JavaThread::_stack_size_at_create = 0;
coleenp@4037 3270 #ifdef ASSERT
coleenp@4037 3271 bool Threads::_vm_complete = false;
coleenp@4037 3272 #endif
duke@435 3273
duke@435 3274 // All JavaThreads
duke@435 3275 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next())
duke@435 3276
duke@435 3277 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system)
duke@435 3278 void Threads::threads_do(ThreadClosure* tc) {
duke@435 3279 assert_locked_or_safepoint(Threads_lock);
duke@435 3280 // ALL_JAVA_THREADS iterates through all JavaThreads
duke@435 3281 ALL_JAVA_THREADS(p) {
duke@435 3282 tc->do_thread(p);
duke@435 3283 }
duke@435 3284 // Someday we could have a table or list of all non-JavaThreads.
duke@435 3285 // For now, just manually iterate through them.
duke@435 3286 tc->do_thread(VMThread::vm_thread());
duke@435 3287 Universe::heap()->gc_threads_do(tc);
xlu@758 3288 WatcherThread *wt = WatcherThread::watcher_thread();
xlu@758 3289 // Strictly speaking, the following NULL check isn't sufficient to make sure
xlu@758 3290 // the data for WatcherThread is still valid upon being examined. However,
xlu@758 3291 // considering that WatchThread terminates when the VM is on the way to
xlu@758 3292 // exit at safepoint, the chance of the above is extremely small. The right
xlu@758 3293 // way to prevent termination of WatcherThread would be to acquire
xlu@758 3294 // Terminator_lock, but we can't do that without violating the lock rank
xlu@758 3295 // checking in some cases.
xlu@758 3296 if (wt != NULL)
xlu@758 3297 tc->do_thread(wt);
xlu@758 3298
duke@435 3299 // If CompilerThreads ever become non-JavaThreads, add them here
duke@435 3300 }
duke@435 3301
duke@435 3302 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
duke@435 3303
kamg@677 3304 extern void JDK_Version_init();
kamg@677 3305
duke@435 3306 // Check version
duke@435 3307 if (!is_supported_jni_version(args->version)) return JNI_EVERSION;
duke@435 3308
duke@435 3309 // Initialize the output stream module
duke@435 3310 ostream_init();
duke@435 3311
duke@435 3312 // Process java launcher properties.
duke@435 3313 Arguments::process_sun_java_launcher_properties(args);
duke@435 3314
duke@435 3315 // Initialize the os module before using TLS
duke@435 3316 os::init();
duke@435 3317
duke@435 3318 // Initialize system properties.
duke@435 3319 Arguments::init_system_properties();
duke@435 3320
kamg@677 3321 // So that JDK version can be used as a discrimintor when parsing arguments
kamg@677 3322 JDK_Version_init();
kamg@677 3323
zgu@2219 3324 // Update/Initialize System properties after JDK version number is known
zgu@2219 3325 Arguments::init_version_specific_system_properties();
zgu@2219 3326
duke@435 3327 // Parse arguments
duke@435 3328 jint parse_result = Arguments::parse(args);
duke@435 3329 if (parse_result != JNI_OK) return parse_result;
duke@435 3330
tschatzl@5701 3331 os::init_before_ergo();
tschatzl@5701 3332
tschatzl@5701 3333 jint ergo_result = Arguments::apply_ergo();
tschatzl@5701 3334 if (ergo_result != JNI_OK) return ergo_result;
tschatzl@5701 3335
duke@435 3336 if (PauseAtStartup) {
duke@435 3337 os::pause();
duke@435 3338 }
duke@435 3339
dcubed@3202 3340 #ifndef USDT2
duke@435 3341 HS_DTRACE_PROBE(hotspot, vm__init__begin);
dcubed@3202 3342 #else /* USDT2 */
dcubed@3202 3343 HOTSPOT_VM_INIT_BEGIN();
dcubed@3202 3344 #endif /* USDT2 */
duke@435 3345
duke@435 3346 // Record VM creation timing statistics
duke@435 3347 TraceVmCreationTime create_vm_timer;
duke@435 3348 create_vm_timer.start();
duke@435 3349
duke@435 3350 // Timing (must come after argument parsing)
duke@435 3351 TraceTime timer("Create VM", TraceStartupTime);
duke@435 3352
duke@435 3353 // Initialize the os module after parsing the args
duke@435 3354 jint os_init_2_result = os::init_2();
duke@435 3355 if (os_init_2_result != JNI_OK) return os_init_2_result;
duke@435 3356
brutisso@4296 3357 jint adjust_after_os_result = Arguments::adjust_after_os();
brutisso@4296 3358 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result;
brutisso@4296 3359
zgu@3900 3360 // intialize TLS
zgu@3900 3361 ThreadLocalStorage::init();
zgu@3900 3362
duke@435 3363 // Initialize output stream logging
duke@435 3364 ostream_init_log();
duke@435 3365
duke@435 3366 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad
duke@435 3367 // Must be before create_vm_init_agents()
duke@435 3368 if (Arguments::init_libraries_at_startup()) {
duke@435 3369 convert_vm_init_libraries_to_agents();
duke@435 3370 }
duke@435 3371
duke@435 3372 // Launch -agentlib/-agentpath and converted -Xrun agents
duke@435 3373 if (Arguments::init_agents_at_startup()) {
duke@435 3374 create_vm_init_agents();
duke@435 3375 }
duke@435 3376
duke@435 3377 // Initialize Threads state
duke@435 3378 _thread_list = NULL;
duke@435 3379 _number_of_threads = 0;
duke@435 3380 _number_of_non_daemon_threads = 0;
duke@435 3381
duke@435 3382 // Initialize global data structures and create system classes in heap
duke@435 3383 vm_init_globals();
duke@435 3384
duke@435 3385 // Attach the main thread to this os thread
duke@435 3386 JavaThread* main_thread = new JavaThread();
duke@435 3387 main_thread->set_thread_state(_thread_in_vm);
duke@435 3388 // must do this before set_active_handles and initialize_thread_local_storage
duke@435 3389 // Note: on solaris initialize_thread_local_storage() will (indirectly)
duke@435 3390 // change the stack size recorded here to one based on the java thread
duke@435 3391 // stacksize. This adjusted size is what is used to figure the placement
duke@435 3392 // of the guard pages.
duke@435 3393 main_thread->record_stack_base_and_size();
duke@435 3394 main_thread->initialize_thread_local_storage();
duke@435 3395
duke@435 3396 main_thread->set_active_handles(JNIHandleBlock::allocate_block());
duke@435 3397
duke@435 3398 if (!main_thread->set_as_starting_thread()) {
duke@435 3399 vm_shutdown_during_initialization(
duke@435 3400 "Failed necessary internal allocation. Out of swap space");
duke@435 3401 delete main_thread;
duke@435 3402 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
duke@435 3403 return JNI_ENOMEM;
duke@435 3404 }
duke@435 3405
duke@435 3406 // Enable guard page *after* os::create_main_thread(), otherwise it would
duke@435 3407 // crash Linux VM, see notes in os_linux.cpp.
duke@435 3408 main_thread->create_stack_guard_pages();
duke@435 3409
acorn@2233 3410 // Initialize Java-Level synchronization subsystem
acorn@2233 3411 ObjectMonitor::Initialize() ;
duke@435 3412
duke@435 3413 // Initialize global modules
duke@435 3414 jint status = init_globals();
duke@435 3415 if (status != JNI_OK) {
duke@435 3416 delete main_thread;
duke@435 3417 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
duke@435 3418 return status;
duke@435 3419 }
duke@435 3420
bobv@2036 3421 // Should be done after the heap is fully created
bobv@2036 3422 main_thread->cache_global_variables();
bobv@2036 3423
duke@435 3424 HandleMark hm;
duke@435 3425
duke@435 3426 { MutexLocker mu(Threads_lock);
duke@435 3427 Threads::add(main_thread);
duke@435 3428 }
duke@435 3429
duke@435 3430 // Any JVMTI raw monitors entered in onload will transition into
duke@435 3431 // real raw monitor. VM is setup enough here for raw monitor enter.
duke@435 3432 JvmtiExport::transition_pending_onload_raw_monitors();
duke@435 3433
duke@435 3434 // Create the VMThread
duke@435 3435 { TraceTime timer("Start VMThread", TraceStartupTime);
duke@435 3436 VMThread::create();
duke@435 3437 Thread* vmthread = VMThread::vm_thread();
duke@435 3438
duke@435 3439 if (!os::create_thread(vmthread, os::vm_thread))
duke@435 3440 vm_exit_during_initialization("Cannot create VM thread. Out of system resources.");
duke@435 3441
duke@435 3442 // Wait for the VM thread to become ready, and VMThread::run to initialize
duke@435 3443 // Monitors can have spurious returns, must always check another state flag
duke@435 3444 {
duke@435 3445 MutexLocker ml(Notify_lock);
duke@435 3446 os::start_thread(vmthread);
duke@435 3447 while (vmthread->active_handles() == NULL) {
duke@435 3448 Notify_lock->wait();
duke@435 3449 }
duke@435 3450 }
duke@435 3451 }
duke@435 3452
duke@435 3453 assert (Universe::is_fully_initialized(), "not initialized");
johnc@4899 3454 if (VerifyDuringStartup) {
stefank@5018 3455 // Make sure we're starting with a clean slate.
stefank@5018 3456 VM_Verify verify_op;
johnc@4899 3457 VMThread::execute(&verify_op);
johnc@4855 3458 }
johnc@4855 3459
duke@435 3460 EXCEPTION_MARK;
duke@435 3461
duke@435 3462 // At this point, the Universe is initialized, but we have not executed
duke@435 3463 // any byte code. Now is a good time (the only time) to dump out the
duke@435 3464 // internal state of the JVM for sharing.
duke@435 3465 if (DumpSharedSpaces) {
coleenp@4037 3466 MetaspaceShared::preload_and_dump(CHECK_0);
duke@435 3467 ShouldNotReachHere();
duke@435 3468 }
duke@435 3469
duke@435 3470 // Always call even when there are not JVMTI environments yet, since environments
duke@435 3471 // may be attached late and JVMTI must track phases of VM execution
duke@435 3472 JvmtiExport::enter_start_phase();
duke@435 3473
duke@435 3474 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
duke@435 3475 JvmtiExport::post_vm_start();
duke@435 3476
duke@435 3477 {
duke@435 3478 TraceTime timer("Initialize java.lang classes", TraceStartupTime);
duke@435 3479
duke@435 3480 if (EagerXrunInit && Arguments::init_libraries_at_startup()) {
duke@435 3481 create_vm_init_libraries();
duke@435 3482 }
duke@435 3483
brutisso@4451 3484 initialize_class(vmSymbols::java_lang_String(), CHECK_0);
duke@435 3485
duke@435 3486 // Initialize java_lang.System (needed before creating the thread)
brutisso@4451 3487 initialize_class(vmSymbols::java_lang_System(), CHECK_0);
brutisso@4451 3488 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0);
brutisso@4451 3489 Handle thread_group = create_initial_thread_group(CHECK_0);
brutisso@4451 3490 Universe::set_main_thread_group(thread_group());
brutisso@4451 3491 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0);
brutisso@4451 3492 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0);
brutisso@4451 3493 main_thread->set_threadObj(thread_object);
brutisso@4451 3494 // Set thread status to running since main thread has
brutisso@4451 3495 // been started and running.
brutisso@4451 3496 java_lang_Thread::set_thread_status(thread_object,
brutisso@4451 3497 java_lang_Thread::RUNNABLE);
brutisso@4451 3498
brutisso@4451 3499 // The VM creates & returns objects of this class. Make sure it's initialized.
brutisso@4451 3500 initialize_class(vmSymbols::java_lang_Class(), CHECK_0);
brutisso@4451 3501
brutisso@4451 3502 // The VM preresolves methods to these classes. Make sure that they get initialized
brutisso@4451 3503 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0);
brutisso@4451 3504 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0);
brutisso@4451 3505 call_initializeSystemClass(CHECK_0);
brutisso@4451 3506
brutisso@4451 3507 // get the Java runtime name after java.lang.System is initialized
brutisso@4451 3508 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD));
brutisso@4451 3509 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD));
duke@435 3510
duke@435 3511 // an instance of OutOfMemory exception has been allocated earlier
brutisso@4451 3512 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0);
brutisso@4451 3513 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0);
brutisso@4451 3514 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0);
brutisso@4451 3515 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0);
brutisso@4451 3516 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0);
brutisso@4451 3517 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0);
brutisso@4451 3518 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0);
brutisso@4451 3519 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0);
twisti@2698 3520 }
duke@435 3521
duke@435 3522 // See : bugid 4211085.
duke@435 3523 // Background : the static initializer of java.lang.Compiler tries to read
duke@435 3524 // property"java.compiler" and read & write property "java.vm.info".
duke@435 3525 // When a security manager is installed through the command line
duke@435 3526 // option "-Djava.security.manager", the above properties are not
duke@435 3527 // readable and the static initializer for java.lang.Compiler fails
duke@435 3528 // resulting in a NoClassDefFoundError. This can happen in any
duke@435 3529 // user code which calls methods in java.lang.Compiler.
duke@435 3530 // Hack : the hack is to pre-load and initialize this class, so that only
duke@435 3531 // system domains are on the stack when the properties are read.
duke@435 3532 // Currently even the AWT code has calls to methods in java.lang.Compiler.
duke@435 3533 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT.
duke@435 3534 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and
duke@435 3535 // read and write"java.vm.info" in the default policy file. See bugid 4211383
duke@435 3536 // Once that is done, we should remove this hack.
coleenp@2497 3537 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0);
duke@435 3538
duke@435 3539 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to
duke@435 3540 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot
duke@435 3541 // compiler does not get loaded through java.lang.Compiler). "java -version" with the
duke@435 3542 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here.
duke@435 3543 // This should also be taken out as soon as 4211383 gets fixed.
duke@435 3544 reset_vm_info_property(CHECK_0);
duke@435 3545
duke@435 3546 quicken_jni_functions();
duke@435 3547
fparain@3559 3548 // Must be run after init_ft which initializes ft_enabled
fparain@3559 3549 if (TRACE_INITIALIZE() != JNI_OK) {
fparain@3559 3550 vm_exit_during_initialization("Failed to initialize tracing backend");
fparain@3559 3551 }
fparain@3559 3552
duke@435 3553 // Set flag that basic initialization has completed. Used by exceptions and various
duke@435 3554 // debug stuff, that does not work until all basic classes have been initialized.
duke@435 3555 set_init_completed();
duke@435 3556
ehelin@6722 3557 Metaspace::post_initialize();
ehelin@6722 3558
dcubed@3202 3559 #ifndef USDT2
duke@435 3560 HS_DTRACE_PROBE(hotspot, vm__init__end);
dcubed@3202 3561 #else /* USDT2 */
dcubed@3202 3562 HOTSPOT_VM_INIT_END();
dcubed@3202 3563 #endif /* USDT2 */
duke@435 3564
duke@435 3565 // record VM initialization completion time
jprovino@4165 3566 #if INCLUDE_MANAGEMENT
duke@435 3567 Management::record_vm_init_completed();
jprovino@4165 3568 #endif // INCLUDE_MANAGEMENT
duke@435 3569
duke@435 3570 // Compute system loader. Note that this has to occur after set_init_completed, since
duke@435 3571 // valid exceptions may be thrown in the process.
duke@435 3572 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and
duke@435 3573 // set_init_completed has just been called, causing exceptions not to be shortcut
duke@435 3574 // anymore. We call vm_exit_during_initialization directly instead.
duke@435 3575 SystemDictionary::compute_java_system_loader(THREAD);
duke@435 3576 if (HAS_PENDING_EXCEPTION) {
duke@435 3577 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
duke@435 3578 }
duke@435 3579
jprovino@4542 3580 #if INCLUDE_ALL_GCS
duke@435 3581 // Support for ConcurrentMarkSweep. This should be cleaned up
ysr@777 3582 // and better encapsulated. The ugly nested if test would go away
ysr@777 3583 // once things are properly refactored. XXX YSR
ysr@777 3584 if (UseConcMarkSweepGC || UseG1GC) {
ysr@777 3585 if (UseConcMarkSweepGC) {
ysr@777 3586 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD);
ysr@777 3587 } else {
ysr@777 3588 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD);
ysr@777 3589 }
duke@435 3590 if (HAS_PENDING_EXCEPTION) {
duke@435 3591 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
duke@435 3592 }
duke@435 3593 }
jprovino@4542 3594 #endif // INCLUDE_ALL_GCS
duke@435 3595
duke@435 3596 // Always call even when there are not JVMTI environments yet, since environments
duke@435 3597 // may be attached late and JVMTI must track phases of VM execution
duke@435 3598 JvmtiExport::enter_live_phase();
duke@435 3599
duke@435 3600 // Signal Dispatcher needs to be started before VMInit event is posted
duke@435 3601 os::signal_init();
duke@435 3602
duke@435 3603 // Start Attach Listener if +StartAttachListener or it can't be started lazily
duke@435 3604 if (!DisableAttachMechanism) {
allwin@5412 3605 AttachListener::vm_start();
duke@435 3606 if (StartAttachListener || AttachListener::init_at_startup()) {
duke@435 3607 AttachListener::init();
duke@435 3608 }
duke@435 3609 }
duke@435 3610
duke@435 3611 // Launch -Xrun agents
duke@435 3612 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP
duke@435 3613 // back-end can launch with -Xdebug -Xrunjdwp.
duke@435 3614 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) {
duke@435 3615 create_vm_init_libraries();
duke@435 3616 }
duke@435 3617
rbackman@3705 3618 // Notify JVMTI agents that VM initialization is complete - nop if no agents.
rbackman@3705 3619 JvmtiExport::post_vm_initialized();
rbackman@3705 3620
sla@5237 3621 if (TRACE_START() != JNI_OK) {
sla@5237 3622 vm_exit_during_initialization("Failed to start tracing backend.");
phh@3427 3623 }
phh@3427 3624
jcoomes@2996 3625 if (CleanChunkPoolAsync) {
jcoomes@2996 3626 Chunk::start_chunk_pool_cleaner_task();
jcoomes@2996 3627 }
duke@435 3628
duke@435 3629 // initialize compiler(s)
twisti@4314 3630 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK)
duke@435 3631 CompileBroker::compilation_init();
jprovino@4165 3632 #endif
jprovino@4165 3633
vlivanov@5631 3634 if (EnableInvokeDynamic) {
vlivanov@5631 3635 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading.
vlivanov@5631 3636 // It is done after compilers are initialized, because otherwise compilations of
vlivanov@5631 3637 // signature polymorphic MH intrinsics can be missed
vlivanov@5631 3638 // (see SystemDictionary::find_method_handle_intrinsic).
vlivanov@5631 3639 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK_0);
vlivanov@5631 3640 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK_0);
vlivanov@5631 3641 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK_0);
vlivanov@5631 3642 }
vlivanov@5631 3643
jprovino@4165 3644 #if INCLUDE_MANAGEMENT
duke@435 3645 Management::initialize(THREAD);
jprovino@4165 3646 #endif // INCLUDE_MANAGEMENT
jprovino@4165 3647
duke@435 3648 if (HAS_PENDING_EXCEPTION) {
duke@435 3649 // management agent fails to start possibly due to
duke@435 3650 // configuration problem and is responsible for printing
duke@435 3651 // stack trace if appropriate. Simply exit VM.
duke@435 3652 vm_exit(1);
duke@435 3653 }
duke@435 3654
duke@435 3655 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true);
duke@435 3656 if (MemProfiling) MemProfiler::engage();
duke@435 3657 StatSampler::engage();
duke@435 3658 if (CheckJNICalls) JniPeriodicChecker::engage();
duke@435 3659
duke@435 3660 BiasedLocking::init();
duke@435 3661
kvn@6429 3662 #if INCLUDE_RTM_OPT
kvn@6429 3663 RTMLockingCounters::init();
kvn@6429 3664 #endif
kvn@6429 3665
kevinw@2449 3666 if (JDK_Version::current().post_vm_init_hook_enabled()) {
kevinw@2449 3667 call_postVMInitHook(THREAD);
kevinw@2449 3668 // The Java side of PostVMInitHook.run must deal with all
kevinw@2449 3669 // exceptions and provide means of diagnosis.
kevinw@2449 3670 if (HAS_PENDING_EXCEPTION) {
kevinw@2449 3671 CLEAR_PENDING_EXCEPTION;
kevinw@2449 3672 }
kevinw@2449 3673 }
duke@435 3674
rbackman@4250 3675 {
rbackman@4250 3676 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
rbackman@4250 3677 // Make sure the watcher thread can be started by WatcherThread::start()
rbackman@4250 3678 // or by dynamic enrollment.
rbackman@4250 3679 WatcherThread::make_startable();
rbackman@4250 3680 // Start up the WatcherThread if there are any periodic tasks
rbackman@4250 3681 // NOTE: All PeriodicTasks should be registered by now. If they
rbackman@4250 3682 // aren't, late joiners might appear to start slowly (we might
rbackman@4250 3683 // take a while to process their first tick).
rbackman@4250 3684 if (PeriodicTask::num_tasks() > 0) {
rbackman@4250 3685 WatcherThread::start();
rbackman@4250 3686 }
duke@435 3687 }
duke@435 3688
bobv@2036 3689 // Give os specific code one last chance to start
bobv@2036 3690 os::init_3();
bobv@2036 3691
duke@435 3692 create_vm_timer.end();
coleenp@4037 3693 #ifdef ASSERT
coleenp@4037 3694 _vm_complete = true;
coleenp@4037 3695 #endif
duke@435 3696 return JNI_OK;
duke@435 3697 }
duke@435 3698
duke@435 3699 // type for the Agent_OnLoad and JVM_OnLoad entry points
duke@435 3700 extern "C" {
duke@435 3701 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *);
duke@435 3702 }
duke@435 3703 // Find a command line agent library and return its entry point for
duke@435 3704 // -agentlib: -agentpath: -Xrun
duke@435 3705 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array.
duke@435 3706 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) {
duke@435 3707 OnLoadEntry_t on_load_entry = NULL;
bpittore@5585 3708 void *library = NULL;
bpittore@5585 3709
bpittore@5585 3710 if (!agent->valid()) {
duke@435 3711 char buffer[JVM_MAXPATHLEN];
duke@435 3712 char ebuf[1024];
duke@435 3713 const char *name = agent->name();
rasbold@2049 3714 const char *msg = "Could not find agent library ";
duke@435 3715
bpittore@5688 3716 // First check to see if agent is statically linked into executable
bpittore@5585 3717 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) {
bpittore@5585 3718 library = agent->os_lib();
bpittore@5585 3719 } else if (agent->is_absolute_path()) {
ikrylov@2322 3720 library = os::dll_load(name, ebuf, sizeof ebuf);
duke@435 3721 if (library == NULL) {
rasbold@2049 3722 const char *sub_msg = " in absolute path, with error: ";
rasbold@2049 3723 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1;
zgu@3900 3724 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
rasbold@2049 3725 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
duke@435 3726 // If we can't find the agent, exit.
rasbold@2049 3727 vm_exit_during_initialization(buf, NULL);
zgu@3900 3728 FREE_C_HEAP_ARRAY(char, buf, mtThread);
duke@435 3729 }
duke@435 3730 } else {
duke@435 3731 // Try to load the agent from the standard dll directory
bpittore@4261 3732 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(),
bpittore@4261 3733 name)) {
bpittore@4261 3734 library = os::dll_load(buffer, ebuf, sizeof ebuf);
bpittore@4261 3735 }
duke@435 3736 if (library == NULL) { // Try the local directory
duke@435 3737 char ns[1] = {0};
bpittore@4261 3738 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) {
bpittore@4261 3739 library = os::dll_load(buffer, ebuf, sizeof ebuf);
bpittore@4261 3740 }
duke@435 3741 if (library == NULL) {
rasbold@2049 3742 const char *sub_msg = " on the library path, with error: ";
rasbold@2049 3743 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1;
zgu@3900 3744 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
rasbold@2049 3745 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
duke@435 3746 // If we can't find the agent, exit.
rasbold@2049 3747 vm_exit_during_initialization(buf, NULL);
zgu@3900 3748 FREE_C_HEAP_ARRAY(char, buf, mtThread);
duke@435 3749 }
duke@435 3750 }
duke@435 3751 }
duke@435 3752 agent->set_os_lib(library);
bpittore@5585 3753 agent->set_valid();
duke@435 3754 }
duke@435 3755
duke@435 3756 // Find the OnLoad function.
bpittore@5585 3757 on_load_entry =
bpittore@5585 3758 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent,
bpittore@5585 3759 false,
bpittore@5585 3760 on_load_symbols,
bpittore@5585 3761 num_symbol_entries));
duke@435 3762 return on_load_entry;
duke@435 3763 }
duke@435 3764
duke@435 3765 // Find the JVM_OnLoad entry point
duke@435 3766 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) {
duke@435 3767 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS;
duke@435 3768 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
duke@435 3769 }
duke@435 3770
duke@435 3771 // Find the Agent_OnLoad entry point
duke@435 3772 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) {
duke@435 3773 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS;
duke@435 3774 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
duke@435 3775 }
duke@435 3776
duke@435 3777 // For backwards compatibility with -Xrun
duke@435 3778 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be
duke@435 3779 // treated like -agentpath:
duke@435 3780 // Must be called before agent libraries are created
duke@435 3781 void Threads::convert_vm_init_libraries_to_agents() {
duke@435 3782 AgentLibrary* agent;
duke@435 3783 AgentLibrary* next;
duke@435 3784
duke@435 3785 for (agent = Arguments::libraries(); agent != NULL; agent = next) {
duke@435 3786 next = agent->next(); // cache the next agent now as this agent may get moved off this list
duke@435 3787 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
duke@435 3788
duke@435 3789 // If there is an JVM_OnLoad function it will get called later,
duke@435 3790 // otherwise see if there is an Agent_OnLoad
duke@435 3791 if (on_load_entry == NULL) {
duke@435 3792 on_load_entry = lookup_agent_on_load(agent);
duke@435 3793 if (on_load_entry != NULL) {
duke@435 3794 // switch it to the agent list -- so that Agent_OnLoad will be called,
duke@435 3795 // JVM_OnLoad won't be attempted and Agent_OnUnload will
duke@435 3796 Arguments::convert_library_to_agent(agent);
duke@435 3797 } else {
duke@435 3798 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name());
duke@435 3799 }
duke@435 3800 }
duke@435 3801 }
duke@435 3802 }
duke@435 3803
duke@435 3804 // Create agents for -agentlib: -agentpath: and converted -Xrun
duke@435 3805 // Invokes Agent_OnLoad
duke@435 3806 // Called very early -- before JavaThreads exist
duke@435 3807 void Threads::create_vm_init_agents() {
duke@435 3808 extern struct JavaVM_ main_vm;
duke@435 3809 AgentLibrary* agent;
duke@435 3810
duke@435 3811 JvmtiExport::enter_onload_phase();
jprovino@4165 3812
duke@435 3813 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
duke@435 3814 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent);
duke@435 3815
duke@435 3816 if (on_load_entry != NULL) {
duke@435 3817 // Invoke the Agent_OnLoad function
duke@435 3818 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
duke@435 3819 if (err != JNI_OK) {
duke@435 3820 vm_exit_during_initialization("agent library failed to init", agent->name());
duke@435 3821 }
duke@435 3822 } else {
duke@435 3823 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name());
duke@435 3824 }
duke@435 3825 }
duke@435 3826 JvmtiExport::enter_primordial_phase();
duke@435 3827 }
duke@435 3828
duke@435 3829 extern "C" {
duke@435 3830 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *);
duke@435 3831 }
duke@435 3832
duke@435 3833 void Threads::shutdown_vm_agents() {
duke@435 3834 // Send any Agent_OnUnload notifications
duke@435 3835 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS;
bpittore@5585 3836 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols);
duke@435 3837 extern struct JavaVM_ main_vm;
duke@435 3838 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
duke@435 3839
duke@435 3840 // Find the Agent_OnUnload function.
bpittore@5585 3841 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t,
bpittore@5585 3842 os::find_agent_function(agent,
bpittore@5585 3843 false,
bpittore@5585 3844 on_unload_symbols,
bpittore@5585 3845 num_symbol_entries));
bpittore@5585 3846
bpittore@5585 3847 // Invoke the Agent_OnUnload function
bpittore@5585 3848 if (unload_entry != NULL) {
bpittore@5585 3849 JavaThread* thread = JavaThread::current();
bpittore@5585 3850 ThreadToNativeFromVM ttn(thread);
bpittore@5585 3851 HandleMark hm(thread);
bpittore@5585 3852 (*unload_entry)(&main_vm);
duke@435 3853 }
duke@435 3854 }
duke@435 3855 }
duke@435 3856
duke@435 3857 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries
duke@435 3858 // Invokes JVM_OnLoad
duke@435 3859 void Threads::create_vm_init_libraries() {
duke@435 3860 extern struct JavaVM_ main_vm;
duke@435 3861 AgentLibrary* agent;
duke@435 3862
duke@435 3863 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) {
duke@435 3864 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
duke@435 3865
duke@435 3866 if (on_load_entry != NULL) {
duke@435 3867 // Invoke the JVM_OnLoad function
duke@435 3868 JavaThread* thread = JavaThread::current();
duke@435 3869 ThreadToNativeFromVM ttn(thread);
duke@435 3870 HandleMark hm(thread);
duke@435 3871 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
duke@435 3872 if (err != JNI_OK) {
duke@435 3873 vm_exit_during_initialization("-Xrun library failed to init", agent->name());
duke@435 3874 }
duke@435 3875 } else {
duke@435 3876 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name());
duke@435 3877 }
duke@435 3878 }
duke@435 3879 }
duke@435 3880
sla@7107 3881 JavaThread* Threads::find_java_thread_from_java_tid(jlong java_tid) {
sla@7107 3882 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
sla@7107 3883
sla@7107 3884 JavaThread* java_thread = NULL;
sla@7107 3885 // Sequential search for now. Need to do better optimization later.
sla@7107 3886 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
sla@7107 3887 oop tobj = thread->threadObj();
sla@7107 3888 if (!thread->is_exiting() &&
sla@7107 3889 tobj != NULL &&
sla@7107 3890 java_tid == java_lang_Thread::thread_id(tobj)) {
sla@7107 3891 java_thread = thread;
sla@7107 3892 break;
sla@7107 3893 }
sla@7107 3894 }
sla@7107 3895 return java_thread;
sla@7107 3896 }
sla@7107 3897
sla@7107 3898
duke@435 3899 // Last thread running calls java.lang.Shutdown.shutdown()
duke@435 3900 void JavaThread::invoke_shutdown_hooks() {
duke@435 3901 HandleMark hm(this);
duke@435 3902
duke@435 3903 // We could get here with a pending exception, if so clear it now.
duke@435 3904 if (this->has_pending_exception()) {
duke@435 3905 this->clear_pending_exception();
duke@435 3906 }
duke@435 3907
duke@435 3908 EXCEPTION_MARK;
coleenp@4037 3909 Klass* k =
coleenp@2497 3910 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(),
duke@435 3911 THREAD);
duke@435 3912 if (k != NULL) {
duke@435 3913 // SystemDictionary::resolve_or_null will return null if there was
duke@435 3914 // an exception. If we cannot load the Shutdown class, just don't
duke@435 3915 // call Shutdown.shutdown() at all. This will mean the shutdown hooks
duke@435 3916 // and finalizers (if runFinalizersOnExit is set) won't be run.
duke@435 3917 // Note that if a shutdown hook was registered or runFinalizersOnExit
duke@435 3918 // was called, the Shutdown class would have already been loaded
duke@435 3919 // (Runtime.addShutdownHook and runFinalizersOnExit will load it).
duke@435 3920 instanceKlassHandle shutdown_klass (THREAD, k);
duke@435 3921 JavaValue result(T_VOID);
duke@435 3922 JavaCalls::call_static(&result,
duke@435 3923 shutdown_klass,
coleenp@2497 3924 vmSymbols::shutdown_method_name(),
coleenp@2497 3925 vmSymbols::void_method_signature(),
duke@435 3926 THREAD);
duke@435 3927 }
duke@435 3928 CLEAR_PENDING_EXCEPTION;
duke@435 3929 }
duke@435 3930
duke@435 3931 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when
duke@435 3932 // the program falls off the end of main(). Another VM exit path is through
duke@435 3933 // vm_exit() when the program calls System.exit() to return a value or when
duke@435 3934 // there is a serious error in VM. The two shutdown paths are not exactly
duke@435 3935 // the same, but they share Shutdown.shutdown() at Java level and before_exit()
duke@435 3936 // and VM_Exit op at VM level.
duke@435 3937 //
duke@435 3938 // Shutdown sequence:
zgu@3900 3939 // + Shutdown native memory tracking if it is on
duke@435 3940 // + Wait until we are the last non-daemon thread to execute
duke@435 3941 // <-- every thing is still working at this moment -->
duke@435 3942 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level
duke@435 3943 // shutdown hooks, run finalizers if finalization-on-exit
duke@435 3944 // + Call before_exit(), prepare for VM exit
duke@435 3945 // > run VM level shutdown hooks (they are registered through JVM_OnExit(),
duke@435 3946 // currently the only user of this mechanism is File.deleteOnExit())
duke@435 3947 // > stop flat profiler, StatSampler, watcher thread, CMS threads,
duke@435 3948 // post thread end and vm death events to JVMTI,
duke@435 3949 // stop signal thread
duke@435 3950 // + Call JavaThread::exit(), it will:
duke@435 3951 // > release JNI handle blocks, remove stack guard pages
duke@435 3952 // > remove this thread from Threads list
duke@435 3953 // <-- no more Java code from this thread after this point -->
duke@435 3954 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop
duke@435 3955 // the compiler threads at safepoint
duke@435 3956 // <-- do not use anything that could get blocked by Safepoint -->
duke@435 3957 // + Disable tracing at JNI/JVM barriers
duke@435 3958 // + Set _vm_exited flag for threads that are still running native code
duke@435 3959 // + Delete this thread
duke@435 3960 // + Call exit_globals()
duke@435 3961 // > deletes tty
duke@435 3962 // > deletes PerfMemory resources
duke@435 3963 // + Return to caller
duke@435 3964
duke@435 3965 bool Threads::destroy_vm() {
duke@435 3966 JavaThread* thread = JavaThread::current();
duke@435 3967
coleenp@4037 3968 #ifdef ASSERT
coleenp@4037 3969 _vm_complete = false;
coleenp@4037 3970 #endif
duke@435 3971 // Wait until we are the last non-daemon thread to execute
duke@435 3972 { MutexLocker nu(Threads_lock);
duke@435 3973 while (Threads::number_of_non_daemon_threads() > 1 )
duke@435 3974 // This wait should make safepoint checks, wait without a timeout,
duke@435 3975 // and wait as a suspend-equivalent condition.
duke@435 3976 //
duke@435 3977 // Note: If the FlatProfiler is running and this thread is waiting
duke@435 3978 // for another non-daemon thread to finish, then the FlatProfiler
duke@435 3979 // is waiting for the external suspend request on this thread to
duke@435 3980 // complete. wait_for_ext_suspend_completion() will eventually
duke@435 3981 // timeout, but that takes time. Making this wait a suspend-
duke@435 3982 // equivalent condition solves that timeout problem.
duke@435 3983 //
duke@435 3984 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
duke@435 3985 Mutex::_as_suspend_equivalent_flag);
duke@435 3986 }
duke@435 3987
duke@435 3988 // Hang forever on exit if we are reporting an error.
duke@435 3989 if (ShowMessageBoxOnError && is_error_reported()) {
duke@435 3990 os::infinite_sleep();
duke@435 3991 }
sla@2584 3992 os::wait_for_keypress_at_exit();
duke@435 3993
duke@435 3994 if (JDK_Version::is_jdk12x_version()) {
duke@435 3995 // We are the last thread running, so check if finalizers should be run.
duke@435 3996 // For 1.3 or later this is done in thread->invoke_shutdown_hooks()
duke@435 3997 HandleMark rm(thread);
duke@435 3998 Universe::run_finalizers_on_exit();
duke@435 3999 } else {
duke@435 4000 // run Java level shutdown hooks
duke@435 4001 thread->invoke_shutdown_hooks();
duke@435 4002 }
duke@435 4003
duke@435 4004 before_exit(thread);
duke@435 4005
duke@435 4006 thread->exit(true);
duke@435 4007
duke@435 4008 // Stop VM thread.
duke@435 4009 {
duke@435 4010 // 4945125 The vm thread comes to a safepoint during exit.
duke@435 4011 // GC vm_operations can get caught at the safepoint, and the
duke@435 4012 // heap is unparseable if they are caught. Grab the Heap_lock
duke@435 4013 // to prevent this. The GC vm_operations will not be able to
pliden@6735 4014 // queue until after the vm thread is dead. After this point,
pliden@6735 4015 // we'll never emerge out of the safepoint before the VM exits.
ysr@2966 4016
duke@435 4017 MutexLocker ml(Heap_lock);
duke@435 4018
duke@435 4019 VMThread::wait_for_vm_thread_exit();
duke@435 4020 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint");
duke@435 4021 VMThread::destroy();
duke@435 4022 }
duke@435 4023
duke@435 4024 // clean up ideal graph printers
duke@435 4025 #if defined(COMPILER2) && !defined(PRODUCT)
duke@435 4026 IdealGraphPrinter::clean_up();
duke@435 4027 #endif
duke@435 4028
duke@435 4029 // Now, all Java threads are gone except daemon threads. Daemon threads
duke@435 4030 // running Java code or in VM are stopped by the Safepoint. However,
duke@435 4031 // daemon threads executing native code are still running. But they
duke@435 4032 // will be stopped at native=>Java/VM barriers. Note that we can't
duke@435 4033 // simply kill or suspend them, as it is inherently deadlock-prone.
duke@435 4034
duke@435 4035 #ifndef PRODUCT
duke@435 4036 // disable function tracing at JNI/JVM barriers
duke@435 4037 TraceJNICalls = false;
duke@435 4038 TraceJVMCalls = false;
duke@435 4039 TraceRuntimeCalls = false;
duke@435 4040 #endif
duke@435 4041
duke@435 4042 VM_Exit::set_vm_exited();
duke@435 4043
duke@435 4044 notify_vm_shutdown();
duke@435 4045
duke@435 4046 delete thread;
duke@435 4047
duke@435 4048 // exit_globals() will delete tty
duke@435 4049 exit_globals();
duke@435 4050
duke@435 4051 return true;
duke@435 4052 }
duke@435 4053
duke@435 4054
duke@435 4055 jboolean Threads::is_supported_jni_version_including_1_1(jint version) {
duke@435 4056 if (version == JNI_VERSION_1_1) return JNI_TRUE;
duke@435 4057 return is_supported_jni_version(version);
duke@435 4058 }
duke@435 4059
duke@435 4060
duke@435 4061 jboolean Threads::is_supported_jni_version(jint version) {
duke@435 4062 if (version == JNI_VERSION_1_2) return JNI_TRUE;
duke@435 4063 if (version == JNI_VERSION_1_4) return JNI_TRUE;
duke@435 4064 if (version == JNI_VERSION_1_6) return JNI_TRUE;
bpittore@4793 4065 if (version == JNI_VERSION_1_8) return JNI_TRUE;
duke@435 4066 return JNI_FALSE;
duke@435 4067 }
duke@435 4068
duke@435 4069
duke@435 4070 void Threads::add(JavaThread* p, bool force_daemon) {
duke@435 4071 // The threads lock must be owned at this point
duke@435 4072 assert_locked_or_safepoint(Threads_lock);
tonyp@2197 4073
tonyp@2197 4074 // See the comment for this method in thread.hpp for its purpose and
tonyp@2197 4075 // why it is called here.
tonyp@2197 4076 p->initialize_queues();
duke@435 4077 p->set_next(_thread_list);
duke@435 4078 _thread_list = p;
duke@435 4079 _number_of_threads++;
duke@435 4080 oop threadObj = p->threadObj();
duke@435 4081 bool daemon = true;
duke@435 4082 // Bootstrapping problem: threadObj can be null for initial
duke@435 4083 // JavaThread (or for threads attached via JNI)
duke@435 4084 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) {
duke@435 4085 _number_of_non_daemon_threads++;
duke@435 4086 daemon = false;
duke@435 4087 }
duke@435 4088
duke@435 4089 ThreadService::add_thread(p, daemon);
duke@435 4090
duke@435 4091 // Possible GC point.
never@3499 4092 Events::log(p, "Thread added: " INTPTR_FORMAT, p);
duke@435 4093 }
duke@435 4094
duke@435 4095 void Threads::remove(JavaThread* p) {
duke@435 4096 // Extra scope needed for Thread_lock, so we can check
duke@435 4097 // that we do not remove thread without safepoint code notice
duke@435 4098 { MutexLocker ml(Threads_lock);
duke@435 4099
duke@435 4100 assert(includes(p), "p must be present");
duke@435 4101
duke@435 4102 JavaThread* current = _thread_list;
duke@435 4103 JavaThread* prev = NULL;
duke@435 4104
duke@435 4105 while (current != p) {
duke@435 4106 prev = current;
duke@435 4107 current = current->next();
duke@435 4108 }
duke@435 4109
duke@435 4110 if (prev) {
duke@435 4111 prev->set_next(current->next());
duke@435 4112 } else {
duke@435 4113 _thread_list = p->next();
duke@435 4114 }
duke@435 4115 _number_of_threads--;
duke@435 4116 oop threadObj = p->threadObj();
duke@435 4117 bool daemon = true;
duke@435 4118 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) {
duke@435 4119 _number_of_non_daemon_threads--;
duke@435 4120 daemon = false;
duke@435 4121
duke@435 4122 // Only one thread left, do a notify on the Threads_lock so a thread waiting
duke@435 4123 // on destroy_vm will wake up.
duke@435 4124 if (number_of_non_daemon_threads() == 1)
duke@435 4125 Threads_lock->notify_all();
duke@435 4126 }
duke@435 4127 ThreadService::remove_thread(p, daemon);
duke@435 4128
duke@435 4129 // Make sure that safepoint code disregard this thread. This is needed since
duke@435 4130 // the thread might mess around with locks after this point. This can cause it
duke@435 4131 // to do callbacks into the safepoint code. However, the safepoint code is not aware
duke@435 4132 // of this thread since it is removed from the queue.
duke@435 4133 p->set_terminated_value();
duke@435 4134 } // unlock Threads_lock
duke@435 4135
duke@435 4136 // Since Events::log uses a lock, we grab it outside the Threads_lock
never@3499 4137 Events::log(p, "Thread exited: " INTPTR_FORMAT, p);
duke@435 4138 }
duke@435 4139
duke@435 4140 // Threads_lock must be held when this is called (or must be called during a safepoint)
duke@435 4141 bool Threads::includes(JavaThread* p) {
duke@435 4142 assert(Threads_lock->is_locked(), "sanity check");
duke@435 4143 ALL_JAVA_THREADS(q) {
duke@435 4144 if (q == p ) {
duke@435 4145 return true;
duke@435 4146 }
duke@435 4147 }
duke@435 4148 return false;
duke@435 4149 }
duke@435 4150
duke@435 4151 // Operations on the Threads list for GC. These are not explicitly locked,
duke@435 4152 // but the garbage collector must provide a safe context for them to run.
duke@435 4153 // In particular, these things should never be called when the Threads_lock
duke@435 4154 // is held by some other thread. (Note: the Safepoint abstraction also
duke@435 4155 // uses the Threads_lock to gurantee this property. It also makes sure that
duke@435 4156 // all threads gets blocked when exiting or starting).
duke@435 4157
stefank@6973 4158 void Threads::oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) {
duke@435 4159 ALL_JAVA_THREADS(p) {
stefank@4298 4160 p->oops_do(f, cld_f, cf);
duke@435 4161 }
stefank@4298 4162 VMThread::vm_thread()->oops_do(f, cld_f, cf);
duke@435 4163 }
duke@435 4164
stefank@6973 4165 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf) {
duke@435 4166 // Introduce a mechanism allowing parallel threads to claim threads as
duke@435 4167 // root groups. Overhead should be small enough to use all the time,
duke@435 4168 // even in sequential code.
duke@435 4169 SharedHeap* sh = SharedHeap::heap();
jmasa@3294 4170 // Cannot yet substitute active_workers for n_par_threads
jmasa@3294 4171 // because of G1CollectedHeap::verify() use of
stefank@6992 4172 // SharedHeap::process_roots(). n_par_threads == 0 will
stefank@6992 4173 // turn off parallelism in process_roots while active_workers
jmasa@3294 4174 // is being used for parallelism elsewhere.
jmasa@3294 4175 bool is_par = sh->n_par_threads() > 0;
jmasa@3294 4176 assert(!is_par ||
jmasa@3294 4177 (SharedHeap::heap()->n_par_threads() ==
jmasa@3294 4178 SharedHeap::heap()->workers()->active_workers()), "Mismatch");
duke@435 4179 int cp = SharedHeap::heap()->strong_roots_parity();
duke@435 4180 ALL_JAVA_THREADS(p) {
duke@435 4181 if (p->claim_oops_do(is_par, cp)) {
stefank@4298 4182 p->oops_do(f, cld_f, cf);
duke@435 4183 }
duke@435 4184 }
duke@435 4185 VMThread* vmt = VMThread::vm_thread();
johnc@3175 4186 if (vmt->claim_oops_do(is_par, cp)) {
stefank@4298 4187 vmt->oops_do(f, cld_f, cf);
johnc@3175 4188 }
duke@435 4189 }
duke@435 4190
jprovino@4542 4191 #if INCLUDE_ALL_GCS
duke@435 4192 // Used by ParallelScavenge
duke@435 4193 void Threads::create_thread_roots_tasks(GCTaskQueue* q) {
duke@435 4194 ALL_JAVA_THREADS(p) {
duke@435 4195 q->enqueue(new ThreadRootsTask(p));
duke@435 4196 }
duke@435 4197 q->enqueue(new ThreadRootsTask(VMThread::vm_thread()));
duke@435 4198 }
duke@435 4199
duke@435 4200 // Used by Parallel Old
duke@435 4201 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) {
duke@435 4202 ALL_JAVA_THREADS(p) {
duke@435 4203 q->enqueue(new ThreadRootsMarkingTask(p));
duke@435 4204 }
duke@435 4205 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread()));
duke@435 4206 }
jprovino@4542 4207 #endif // INCLUDE_ALL_GCS
duke@435 4208
jrose@1424 4209 void Threads::nmethods_do(CodeBlobClosure* cf) {
duke@435 4210 ALL_JAVA_THREADS(p) {
jrose@1424 4211 p->nmethods_do(cf);
duke@435 4212 }
jrose@1424 4213 VMThread::vm_thread()->nmethods_do(cf);
duke@435 4214 }
duke@435 4215
coleenp@4037 4216 void Threads::metadata_do(void f(Metadata*)) {
coleenp@4037 4217 ALL_JAVA_THREADS(p) {
coleenp@4037 4218 p->metadata_do(f);
coleenp@4037 4219 }
coleenp@4037 4220 }
coleenp@4037 4221
duke@435 4222 void Threads::gc_epilogue() {
duke@435 4223 ALL_JAVA_THREADS(p) {
duke@435 4224 p->gc_epilogue();
duke@435 4225 }
duke@435 4226 }
duke@435 4227
duke@435 4228 void Threads::gc_prologue() {
duke@435 4229 ALL_JAVA_THREADS(p) {
duke@435 4230 p->gc_prologue();
duke@435 4231 }
duke@435 4232 }
duke@435 4233
duke@435 4234 void Threads::deoptimized_wrt_marked_nmethods() {
duke@435 4235 ALL_JAVA_THREADS(p) {
duke@435 4236 p->deoptimized_wrt_marked_nmethods();
duke@435 4237 }
duke@435 4238 }
duke@435 4239
duke@435 4240
duke@435 4241 // Get count Java threads that are waiting to enter the specified monitor.
duke@435 4242 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count,
duke@435 4243 address monitor, bool doLock) {
duke@435 4244 assert(doLock || SafepointSynchronize::is_at_safepoint(),
duke@435 4245 "must grab Threads_lock or be at safepoint");
duke@435 4246 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count);
duke@435 4247
duke@435 4248 int i = 0;
duke@435 4249 {
duke@435 4250 MutexLockerEx ml(doLock ? Threads_lock : NULL);
duke@435 4251 ALL_JAVA_THREADS(p) {
duke@435 4252 if (p->is_Compiler_thread()) continue;
duke@435 4253
duke@435 4254 address pending = (address)p->current_pending_monitor();
duke@435 4255 if (pending == monitor) { // found a match
duke@435 4256 if (i < count) result->append(p); // save the first count matches
duke@435 4257 i++;
duke@435 4258 }
duke@435 4259 }
duke@435 4260 }
duke@435 4261 return result;
duke@435 4262 }
duke@435 4263
duke@435 4264
duke@435 4265 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) {
duke@435 4266 assert(doLock ||
duke@435 4267 Threads_lock->owned_by_self() ||
duke@435 4268 SafepointSynchronize::is_at_safepoint(),
duke@435 4269 "must grab Threads_lock or be at safepoint");
duke@435 4270
duke@435 4271 // NULL owner means not locked so we can skip the search
duke@435 4272 if (owner == NULL) return NULL;
duke@435 4273
duke@435 4274 {
duke@435 4275 MutexLockerEx ml(doLock ? Threads_lock : NULL);
duke@435 4276 ALL_JAVA_THREADS(p) {
duke@435 4277 // first, see if owner is the address of a Java thread
duke@435 4278 if (owner == (address)p) return p;
duke@435 4279 }
duke@435 4280 }
dcubed@4673 4281 // Cannot assert on lack of success here since this function may be
dcubed@4673 4282 // used by code that is trying to report useful problem information
dcubed@4673 4283 // like deadlock detection.
duke@435 4284 if (UseHeavyMonitors) return NULL;
duke@435 4285
duke@435 4286 //
duke@435 4287 // If we didn't find a matching Java thread and we didn't force use of
duke@435 4288 // heavyweight monitors, then the owner is the stack address of the
duke@435 4289 // Lock Word in the owning Java thread's stack.
duke@435 4290 //
duke@435 4291 JavaThread* the_owner = NULL;
duke@435 4292 {
duke@435 4293 MutexLockerEx ml(doLock ? Threads_lock : NULL);
duke@435 4294 ALL_JAVA_THREADS(q) {
xlu@1137 4295 if (q->is_lock_owned(owner)) {
duke@435 4296 the_owner = q;
xlu@1137 4297 break;
duke@435 4298 }
duke@435 4299 }
duke@435 4300 }
dcubed@4673 4301 // cannot assert on lack of success here; see above comment
duke@435 4302 return the_owner;
duke@435 4303 }
duke@435 4304
duke@435 4305 // Threads::print_on() is called at safepoint by VM_PrintThreads operation.
duke@435 4306 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) {
duke@435 4307 char buf[32];
drchase@6680 4308 st->print_cr("%s", os::local_time_string(buf, sizeof(buf)));
duke@435 4309
duke@435 4310 st->print_cr("Full thread dump %s (%s %s):",
duke@435 4311 Abstract_VM_Version::vm_name(),
duke@435 4312 Abstract_VM_Version::vm_release(),
duke@435 4313 Abstract_VM_Version::vm_info_string()
duke@435 4314 );
duke@435 4315 st->cr();
duke@435 4316
jprovino@4542 4317 #if INCLUDE_ALL_GCS
duke@435 4318 // Dump concurrent locks
duke@435 4319 ConcurrentLocksDump concurrent_locks;
duke@435 4320 if (print_concurrent_locks) {
duke@435 4321 concurrent_locks.dump_at_safepoint();
duke@435 4322 }
jprovino@4542 4323 #endif // INCLUDE_ALL_GCS
duke@435 4324
duke@435 4325 ALL_JAVA_THREADS(p) {
duke@435 4326 ResourceMark rm;
duke@435 4327 p->print_on(st);
duke@435 4328 if (print_stacks) {
duke@435 4329 if (internal_format) {
duke@435 4330 p->trace_stack();
duke@435 4331 } else {
duke@435 4332 p->print_stack_on(st);
duke@435 4333 }
duke@435 4334 }
duke@435 4335 st->cr();
jprovino@4542 4336 #if INCLUDE_ALL_GCS
duke@435 4337 if (print_concurrent_locks) {
duke@435 4338 concurrent_locks.print_locks_on(p, st);
duke@435 4339 }
jprovino@4542 4340 #endif // INCLUDE_ALL_GCS
duke@435 4341 }
duke@435 4342
duke@435 4343 VMThread::vm_thread()->print_on(st);
duke@435 4344 st->cr();
duke@435 4345 Universe::heap()->print_gc_threads_on(st);
duke@435 4346 WatcherThread* wt = WatcherThread::watcher_thread();
dholmes@4077 4347 if (wt != NULL) {
dholmes@4077 4348 wt->print_on(st);
dholmes@4077 4349 st->cr();
dholmes@4077 4350 }
duke@435 4351 CompileBroker::print_compiler_threads_on(st);
duke@435 4352 st->flush();
duke@435 4353 }
duke@435 4354
duke@435 4355 // Threads::print_on_error() is called by fatal error handler. It's possible
duke@435 4356 // that VM is not at safepoint and/or current thread is inside signal handler.
duke@435 4357 // Don't print stack trace, as the stack may not be walkable. Don't allocate
duke@435 4358 // memory (even in resource area), it might deadlock the error handler.
duke@435 4359 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) {
duke@435 4360 bool found_current = false;
duke@435 4361 st->print_cr("Java Threads: ( => current thread )");
duke@435 4362 ALL_JAVA_THREADS(thread) {
duke@435 4363 bool is_current = (current == thread);
duke@435 4364 found_current = found_current || is_current;
duke@435 4365
duke@435 4366 st->print("%s", is_current ? "=>" : " ");
duke@435 4367
duke@435 4368 st->print(PTR_FORMAT, thread);
duke@435 4369 st->print(" ");
duke@435 4370 thread->print_on_error(st, buf, buflen);
duke@435 4371 st->cr();
duke@435 4372 }
duke@435 4373 st->cr();
duke@435 4374
duke@435 4375 st->print_cr("Other Threads:");
duke@435 4376 if (VMThread::vm_thread()) {
duke@435 4377 bool is_current = (current == VMThread::vm_thread());
duke@435 4378 found_current = found_current || is_current;
duke@435 4379 st->print("%s", current == VMThread::vm_thread() ? "=>" : " ");
duke@435 4380
duke@435 4381 st->print(PTR_FORMAT, VMThread::vm_thread());
duke@435 4382 st->print(" ");
duke@435 4383 VMThread::vm_thread()->print_on_error(st, buf, buflen);
duke@435 4384 st->cr();
duke@435 4385 }
duke@435 4386 WatcherThread* wt = WatcherThread::watcher_thread();
duke@435 4387 if (wt != NULL) {
duke@435 4388 bool is_current = (current == wt);
duke@435 4389 found_current = found_current || is_current;
duke@435 4390 st->print("%s", is_current ? "=>" : " ");
duke@435 4391
duke@435 4392 st->print(PTR_FORMAT, wt);
duke@435 4393 st->print(" ");
duke@435 4394 wt->print_on_error(st, buf, buflen);
duke@435 4395 st->cr();
duke@435 4396 }
duke@435 4397 if (!found_current) {
duke@435 4398 st->cr();
duke@435 4399 st->print("=>" PTR_FORMAT " (exited) ", current);
duke@435 4400 current->print_on_error(st, buf, buflen);
duke@435 4401 st->cr();
duke@435 4402 }
duke@435 4403 }
duke@435 4404
acorn@2233 4405 // Internal SpinLock and Mutex
acorn@2233 4406 // Based on ParkEvent
acorn@2233 4407
acorn@2233 4408 // Ad-hoc mutual exclusion primitives: SpinLock and Mux
duke@435 4409 //
acorn@2233 4410 // We employ SpinLocks _only for low-contention, fixed-length
acorn@2233 4411 // short-duration critical sections where we're concerned
acorn@2233 4412 // about native mutex_t or HotSpot Mutex:: latency.
acorn@2233 4413 // The mux construct provides a spin-then-block mutual exclusion
acorn@2233 4414 // mechanism.
duke@435 4415 //
acorn@2233 4416 // Testing has shown that contention on the ListLock guarding gFreeList
acorn@2233 4417 // is common. If we implement ListLock as a simple SpinLock it's common
acorn@2233 4418 // for the JVM to devolve to yielding with little progress. This is true
acorn@2233 4419 // despite the fact that the critical sections protected by ListLock are
acorn@2233 4420 // extremely short.
duke@435 4421 //
acorn@2233 4422 // TODO-FIXME: ListLock should be of type SpinLock.
acorn@2233 4423 // We should make this a 1st-class type, integrated into the lock
acorn@2233 4424 // hierarchy as leaf-locks. Critically, the SpinLock structure
acorn@2233 4425 // should have sufficient padding to avoid false-sharing and excessive
acorn@2233 4426 // cache-coherency traffic.
acorn@2233 4427
acorn@2233 4428
acorn@2233 4429 typedef volatile int SpinLockT ;
acorn@2233 4430
acorn@2233 4431 void Thread::SpinAcquire (volatile int * adr, const char * LockName) {
acorn@2233 4432 if (Atomic::cmpxchg (1, adr, 0) == 0) {
acorn@2233 4433 return ; // normal fast-path return
acorn@2233 4434 }
acorn@2233 4435
acorn@2233 4436 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy.
acorn@2233 4437 TEVENT (SpinAcquire - ctx) ;
acorn@2233 4438 int ctr = 0 ;
acorn@2233 4439 int Yields = 0 ;
duke@435 4440 for (;;) {
acorn@2233 4441 while (*adr != 0) {
acorn@2233 4442 ++ctr ;
acorn@2233 4443 if ((ctr & 0xFFF) == 0 || !os::is_MP()) {
acorn@2233 4444 if (Yields > 5) {
dsimms@6348 4445 os::naked_short_sleep(1);
acorn@2233 4446 } else {
acorn@2233 4447 os::NakedYield() ;
acorn@2233 4448 ++Yields ;
acorn@2233 4449 }
acorn@2233 4450 } else {
acorn@2233 4451 SpinPause() ;
duke@435 4452 }
acorn@2233 4453 }
acorn@2233 4454 if (Atomic::cmpxchg (1, adr, 0) == 0) return ;
duke@435 4455 }
duke@435 4456 }
duke@435 4457
acorn@2233 4458 void Thread::SpinRelease (volatile int * adr) {
acorn@2233 4459 assert (*adr != 0, "invariant") ;
acorn@2233 4460 OrderAccess::fence() ; // guarantee at least release consistency.
acorn@2233 4461 // Roach-motel semantics.
acorn@2233 4462 // It's safe if subsequent LDs and STs float "up" into the critical section,
acorn@2233 4463 // but prior LDs and STs within the critical section can't be allowed
acorn@2233 4464 // to reorder or float past the ST that releases the lock.
acorn@2233 4465 *adr = 0 ;
duke@435 4466 }
duke@435 4467
acorn@2233 4468 // muxAcquire and muxRelease:
acorn@2233 4469 //
acorn@2233 4470 // * muxAcquire and muxRelease support a single-word lock-word construct.
acorn@2233 4471 // The LSB of the word is set IFF the lock is held.
acorn@2233 4472 // The remainder of the word points to the head of a singly-linked list
acorn@2233 4473 // of threads blocked on the lock.
acorn@2233 4474 //
acorn@2233 4475 // * The current implementation of muxAcquire-muxRelease uses its own
acorn@2233 4476 // dedicated Thread._MuxEvent instance. If we're interested in
acorn@2233 4477 // minimizing the peak number of extant ParkEvent instances then
acorn@2233 4478 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long
acorn@2233 4479 // as certain invariants were satisfied. Specifically, care would need
acorn@2233 4480 // to be taken with regards to consuming unpark() "permits".
acorn@2233 4481 // A safe rule of thumb is that a thread would never call muxAcquire()
acorn@2233 4482 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently
acorn@2233 4483 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could
acorn@2233 4484 // consume an unpark() permit intended for monitorenter, for instance.
acorn@2233 4485 // One way around this would be to widen the restricted-range semaphore
acorn@2233 4486 // implemented in park(). Another alternative would be to provide
acorn@2233 4487 // multiple instances of the PlatformEvent() for each thread. One
acorn@2233 4488 // instance would be dedicated to muxAcquire-muxRelease, for instance.
acorn@2233 4489 //
acorn@2233 4490 // * Usage:
acorn@2233 4491 // -- Only as leaf locks
acorn@2233 4492 // -- for short-term locking only as muxAcquire does not perform
acorn@2233 4493 // thread state transitions.
acorn@2233 4494 //
acorn@2233 4495 // Alternatives:
acorn@2233 4496 // * We could implement muxAcquire and muxRelease with MCS or CLH locks
acorn@2233 4497 // but with parking or spin-then-park instead of pure spinning.
acorn@2233 4498 // * Use Taura-Oyama-Yonenzawa locks.
acorn@2233 4499 // * It's possible to construct a 1-0 lock if we encode the lockword as
acorn@2233 4500 // (List,LockByte). Acquire will CAS the full lockword while Release
acorn@2233 4501 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so
acorn@2233 4502 // acquiring threads use timers (ParkTimed) to detect and recover from
acorn@2233 4503 // the stranding window. Thread/Node structures must be aligned on 256-byte
acorn@2233 4504 // boundaries by using placement-new.
acorn@2233 4505 // * Augment MCS with advisory back-link fields maintained with CAS().
acorn@2233 4506 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner.
acorn@2233 4507 // The validity of the backlinks must be ratified before we trust the value.
acorn@2233 4508 // If the backlinks are invalid the exiting thread must back-track through the
acorn@2233 4509 // the forward links, which are always trustworthy.
acorn@2233 4510 // * Add a successor indication. The LockWord is currently encoded as
acorn@2233 4511 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable
acorn@2233 4512 // to provide the usual futile-wakeup optimization.
acorn@2233 4513 // See RTStt for details.
acorn@2233 4514 // * Consider schedctl.sc_nopreempt to cover the critical section.
acorn@2233 4515 //
acorn@2233 4516
acorn@2233 4517
acorn@2233 4518 typedef volatile intptr_t MutexT ; // Mux Lock-word
acorn@2233 4519 enum MuxBits { LOCKBIT = 1 } ;
acorn@2233 4520
acorn@2233 4521 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) {
acorn@2233 4522 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ;
acorn@2233 4523 if (w == 0) return ;
acorn@2233 4524 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4525 return ;
acorn@2233 4526 }
acorn@2233 4527
acorn@2233 4528 TEVENT (muxAcquire - Contention) ;
acorn@2233 4529 ParkEvent * const Self = Thread::current()->_MuxEvent ;
acorn@2233 4530 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ;
duke@435 4531 for (;;) {
acorn@2233 4532 int its = (os::is_MP() ? 100 : 0) + 1 ;
acorn@2233 4533
acorn@2233 4534 // Optional spin phase: spin-then-park strategy
acorn@2233 4535 while (--its >= 0) {
acorn@2233 4536 w = *Lock ;
acorn@2233 4537 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4538 return ;
acorn@2233 4539 }
acorn@2233 4540 }
acorn@2233 4541
acorn@2233 4542 Self->reset() ;
acorn@2233 4543 Self->OnList = intptr_t(Lock) ;
acorn@2233 4544 // The following fence() isn't _strictly necessary as the subsequent
acorn@2233 4545 // CAS() both serializes execution and ratifies the fetched *Lock value.
acorn@2233 4546 OrderAccess::fence();
acorn@2233 4547 for (;;) {
acorn@2233 4548 w = *Lock ;
acorn@2233 4549 if ((w & LOCKBIT) == 0) {
acorn@2233 4550 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4551 Self->OnList = 0 ; // hygiene - allows stronger asserts
acorn@2233 4552 return ;
acorn@2233 4553 }
acorn@2233 4554 continue ; // Interference -- *Lock changed -- Just retry
duke@435 4555 }
acorn@2233 4556 assert (w & LOCKBIT, "invariant") ;
acorn@2233 4557 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT );
acorn@2233 4558 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ;
acorn@2233 4559 }
acorn@2233 4560
acorn@2233 4561 while (Self->OnList != 0) {
acorn@2233 4562 Self->park() ;
acorn@2233 4563 }
duke@435 4564 }
duke@435 4565 }
duke@435 4566
acorn@2233 4567 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) {
acorn@2233 4568 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ;
acorn@2233 4569 if (w == 0) return ;
acorn@2233 4570 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4571 return ;
acorn@2233 4572 }
acorn@2233 4573
acorn@2233 4574 TEVENT (muxAcquire - Contention) ;
acorn@2233 4575 ParkEvent * ReleaseAfter = NULL ;
acorn@2233 4576 if (ev == NULL) {
acorn@2233 4577 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ;
acorn@2233 4578 }
acorn@2233 4579 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ;
acorn@2233 4580 for (;;) {
acorn@2233 4581 guarantee (ev->OnList == 0, "invariant") ;
acorn@2233 4582 int its = (os::is_MP() ? 100 : 0) + 1 ;
acorn@2233 4583
acorn@2233 4584 // Optional spin phase: spin-then-park strategy
acorn@2233 4585 while (--its >= 0) {
acorn@2233 4586 w = *Lock ;
acorn@2233 4587 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4588 if (ReleaseAfter != NULL) {
acorn@2233 4589 ParkEvent::Release (ReleaseAfter) ;
acorn@2233 4590 }
acorn@2233 4591 return ;
acorn@2233 4592 }
acorn@2233 4593 }
acorn@2233 4594
acorn@2233 4595 ev->reset() ;
acorn@2233 4596 ev->OnList = intptr_t(Lock) ;
acorn@2233 4597 // The following fence() isn't _strictly necessary as the subsequent
acorn@2233 4598 // CAS() both serializes execution and ratifies the fetched *Lock value.
acorn@2233 4599 OrderAccess::fence();
acorn@2233 4600 for (;;) {
acorn@2233 4601 w = *Lock ;
acorn@2233 4602 if ((w & LOCKBIT) == 0) {
acorn@2233 4603 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
acorn@2233 4604 ev->OnList = 0 ;
acorn@2233 4605 // We call ::Release while holding the outer lock, thus
acorn@2233 4606 // artificially lengthening the critical section.
acorn@2233 4607 // Consider deferring the ::Release() until the subsequent unlock(),
acorn@2233 4608 // after we've dropped the outer lock.
acorn@2233 4609 if (ReleaseAfter != NULL) {
acorn@2233 4610 ParkEvent::Release (ReleaseAfter) ;
acorn@2233 4611 }
acorn@2233 4612 return ;
acorn@2233 4613 }
acorn@2233 4614 continue ; // Interference -- *Lock changed -- Just retry
acorn@2233 4615 }
acorn@2233 4616 assert (w & LOCKBIT, "invariant") ;
acorn@2233 4617 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT );
acorn@2233 4618 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ;
acorn@2233 4619 }
acorn@2233 4620
acorn@2233 4621 while (ev->OnList != 0) {
acorn@2233 4622 ev->park() ;
acorn@2233 4623 }
acorn@2233 4624 }
acorn@2233 4625 }
acorn@2233 4626
acorn@2233 4627 // Release() must extract a successor from the list and then wake that thread.
acorn@2233 4628 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme
acorn@2233 4629 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based
acorn@2233 4630 // Release() would :
acorn@2233 4631 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list.
acorn@2233 4632 // (B) Extract a successor from the private list "in-hand"
acorn@2233 4633 // (C) attempt to CAS() the residual back into *Lock over null.
acorn@2233 4634 // If there were any newly arrived threads and the CAS() would fail.
acorn@2233 4635 // In that case Release() would detach the RATs, re-merge the list in-hand
acorn@2233 4636 // with the RATs and repeat as needed. Alternately, Release() might
acorn@2233 4637 // detach and extract a successor, but then pass the residual list to the wakee.
acorn@2233 4638 // The wakee would be responsible for reattaching and remerging before it
acorn@2233 4639 // competed for the lock.
acorn@2233 4640 //
acorn@2233 4641 // Both "pop" and DMR are immune from ABA corruption -- there can be
acorn@2233 4642 // multiple concurrent pushers, but only one popper or detacher.
acorn@2233 4643 // This implementation pops from the head of the list. This is unfair,
acorn@2233 4644 // but tends to provide excellent throughput as hot threads remain hot.
acorn@2233 4645 // (We wake recently run threads first).
acorn@2233 4646
acorn@2233 4647 void Thread::muxRelease (volatile intptr_t * Lock) {
acorn@2233 4648 for (;;) {
acorn@2233 4649 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ;
acorn@2233 4650 assert (w & LOCKBIT, "invariant") ;
acorn@2233 4651 if (w == LOCKBIT) return ;
acorn@2233 4652 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ;
acorn@2233 4653 assert (List != NULL, "invariant") ;
acorn@2233 4654 assert (List->OnList == intptr_t(Lock), "invariant") ;
acorn@2233 4655 ParkEvent * nxt = List->ListNext ;
acorn@2233 4656
acorn@2233 4657 // The following CAS() releases the lock and pops the head element.
acorn@2233 4658 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) {
acorn@2233 4659 continue ;
acorn@2233 4660 }
acorn@2233 4661 List->OnList = 0 ;
acorn@2233 4662 OrderAccess::fence() ;
acorn@2233 4663 List->unpark () ;
acorn@2233 4664 return ;
acorn@2233 4665 }
acorn@2233 4666 }
acorn@2233 4667
acorn@2233 4668
duke@435 4669 void Threads::verify() {
duke@435 4670 ALL_JAVA_THREADS(p) {
duke@435 4671 p->verify();
duke@435 4672 }
duke@435 4673 VMThread* thread = VMThread::vm_thread();
duke@435 4674 if (thread != NULL) thread->verify();
duke@435 4675 }

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