Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 7608:689e1218d7fe
8004018: Remove old initialization flags
Reviewed-by: dholmes, stefank
Contributed-by: erik.helin@oracle.com
| author | brutisso |
|---|---|
| date | Mon, 14 Jan 2013 09:58:52 +0100 |
| parents | 69627aa9ab10 |
| children | f422634e5828 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
| 1972 | 38 #include "memory/oopFactory.hpp" |
| 39 #include "memory/universe.inline.hpp" | |
| 40 #include "oops/instanceKlass.hpp" | |
| 41 #include "oops/objArrayOop.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
| 1972 | 44 #include "prims/jvm_misc.hpp" |
| 45 #include "prims/jvmtiExport.hpp" | |
| 46 #include "prims/jvmtiThreadState.hpp" | |
| 47 #include "prims/privilegedStack.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/arguments.hpp" | |
| 50 #include "runtime/biasedLocking.hpp" | |
| 51 #include "runtime/deoptimization.hpp" | |
| 52 #include "runtime/fprofiler.hpp" | |
| 53 #include "runtime/frame.inline.hpp" | |
| 54 #include "runtime/init.hpp" | |
| 55 #include "runtime/interfaceSupport.hpp" | |
| 56 #include "runtime/java.hpp" | |
| 57 #include "runtime/javaCalls.hpp" | |
| 58 #include "runtime/jniPeriodicChecker.hpp" | |
| 59 #include "runtime/memprofiler.hpp" | |
| 60 #include "runtime/mutexLocker.hpp" | |
| 61 #include "runtime/objectMonitor.hpp" | |
| 62 #include "runtime/osThread.hpp" | |
| 63 #include "runtime/safepoint.hpp" | |
| 64 #include "runtime/sharedRuntime.hpp" | |
| 65 #include "runtime/statSampler.hpp" | |
| 66 #include "runtime/stubRoutines.hpp" | |
| 67 #include "runtime/task.hpp" | |
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68 #include "runtime/thread.inline.hpp" |
| 1972 | 69 #include "runtime/threadCritical.hpp" |
| 70 #include "runtime/threadLocalStorage.hpp" | |
| 71 #include "runtime/vframe.hpp" | |
| 72 #include "runtime/vframeArray.hpp" | |
| 73 #include "runtime/vframe_hp.hpp" | |
| 74 #include "runtime/vmThread.hpp" | |
| 75 #include "runtime/vm_operations.hpp" | |
| 76 #include "services/attachListener.hpp" | |
| 77 #include "services/management.hpp" | |
| 6197 | 78 #include "services/memTracker.hpp" |
| 1972 | 79 #include "services/threadService.hpp" |
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80 #include "trace/traceEventTypes.hpp" |
| 1972 | 81 #include "utilities/defaultStream.hpp" |
| 82 #include "utilities/dtrace.hpp" | |
| 83 #include "utilities/events.hpp" | |
| 84 #include "utilities/preserveException.hpp" | |
| 85 #ifdef TARGET_OS_FAMILY_linux | |
| 86 # include "os_linux.inline.hpp" | |
| 87 #endif | |
| 88 #ifdef TARGET_OS_FAMILY_solaris | |
| 89 # include "os_solaris.inline.hpp" | |
| 90 #endif | |
| 91 #ifdef TARGET_OS_FAMILY_windows | |
| 92 # include "os_windows.inline.hpp" | |
| 93 #endif | |
| 3960 | 94 #ifdef TARGET_OS_FAMILY_bsd |
| 95 # include "os_bsd.inline.hpp" | |
| 96 #endif | |
| 1972 | 97 #ifndef SERIALGC |
| 98 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 99 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 100 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 101 #endif | |
| 102 #ifdef COMPILER1 | |
| 103 #include "c1/c1_Compiler.hpp" | |
| 104 #endif | |
| 105 #ifdef COMPILER2 | |
| 106 #include "opto/c2compiler.hpp" | |
| 107 #include "opto/idealGraphPrinter.hpp" | |
| 108 #endif | |
| 0 | 109 |
| 110 #ifdef DTRACE_ENABLED | |
| 111 | |
| 112 // Only bother with this argument setup if dtrace is available | |
| 113 | |
| 4006 | 114 #ifndef USDT2 |
| 0 | 115 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 116 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 117 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 118 intptr_t, intptr_t, bool); | |
| 119 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 120 intptr_t, intptr_t, bool); | |
| 121 | |
| 122 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 123 { \ | |
| 124 ResourceMark rm(this); \ | |
| 125 int len = 0; \ | |
| 126 const char* name = (javathread)->get_thread_name(); \ | |
| 127 len = strlen(name); \ | |
| 128 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 129 name, len, \ | |
| 130 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 131 (javathread)->osthread()->thread_id(), \ | |
| 132 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 133 } | |
| 134 | |
| 4006 | 135 #else /* USDT2 */ |
| 136 | |
| 137 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 138 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 139 | |
| 140 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 141 { \ | |
| 142 ResourceMark rm(this); \ | |
| 143 int len = 0; \ | |
| 144 const char* name = (javathread)->get_thread_name(); \ | |
| 145 len = strlen(name); \ | |
| 146 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 147 (char *) name, len, \ | |
| 148 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 149 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 150 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 151 } | |
| 152 | |
| 153 #endif /* USDT2 */ | |
| 154 | |
| 0 | 155 #else // ndef DTRACE_ENABLED |
| 156 | |
| 157 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 158 | |
| 159 #endif // ndef DTRACE_ENABLED | |
| 160 | |
| 6197 | 161 |
| 0 | 162 // Class hierarchy |
| 163 // - Thread | |
| 164 // - VMThread | |
| 165 // - WatcherThread | |
| 166 // - ConcurrentMarkSweepThread | |
| 167 // - JavaThread | |
| 168 // - CompilerThread | |
| 169 | |
| 170 // ======= Thread ======== | |
| 171 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 172 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 173 if (UseBiasedLocking) { |
| 174 const int alignment = markOopDesc::biased_lock_alignment; | |
| 175 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 176 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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177 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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178 AllocFailStrategy::RETURN_NULL); |
| 0 | 179 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 180 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 181 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 182 "JavaThread alignment code overflowed allocated storage"); | |
| 183 if (TraceBiasedLocking) { | |
| 184 if (aligned_addr != real_malloc_addr) | |
| 185 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 186 real_malloc_addr, aligned_addr); | |
| 187 } | |
| 188 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 189 return aligned_addr; | |
| 190 } else { | |
| 6197 | 191 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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192 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 193 } |
| 194 } | |
| 195 | |
| 196 void Thread::operator delete(void* p) { | |
| 197 if (UseBiasedLocking) { | |
| 198 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 199 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 200 } else { |
| 6197 | 201 FreeHeap(p, mtThread); |
| 0 | 202 } |
| 203 } | |
| 204 | |
| 205 | |
| 206 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 207 // JavaThread | |
| 208 | |
| 209 | |
| 210 Thread::Thread() { | |
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211 // stack and get_thread |
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212 set_stack_base(NULL); |
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213 set_stack_size(0); |
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214 set_self_raw_id(0); |
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215 set_lgrp_id(-1); |
| 0 | 216 |
| 217 // allocated data structures | |
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218 set_osthread(NULL); |
| 6197 | 219 set_resource_area(new (mtThread)ResourceArea()); |
| 220 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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221 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
| 0 | 222 set_active_handles(NULL); |
| 223 set_free_handle_block(NULL); | |
| 224 set_last_handle_mark(NULL); | |
| 225 | |
| 226 // This initial value ==> never claimed. | |
| 227 _oops_do_parity = 0; | |
| 228 | |
| 229 // the handle mark links itself to last_handle_mark | |
| 230 new HandleMark(this); | |
| 231 | |
| 232 // plain initialization | |
| 233 debug_only(_owned_locks = NULL;) | |
| 234 debug_only(_allow_allocation_count = 0;) | |
| 235 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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236 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 237 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 238 _jvmti_env_iteration_count = 0; | |
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239 set_allocated_bytes(0); |
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240 set_trace_buffer(NULL); |
| 0 | 241 _vm_operation_started_count = 0; |
| 242 _vm_operation_completed_count = 0; | |
| 243 _current_pending_monitor = NULL; | |
| 244 _current_pending_monitor_is_from_java = true; | |
| 245 _current_waiting_monitor = NULL; | |
| 246 _num_nested_signal = 0; | |
| 247 omFreeList = NULL ; | |
| 248 omFreeCount = 0 ; | |
| 249 omFreeProvision = 32 ; | |
| 1587 | 250 omInUseList = NULL ; |
| 251 omInUseCount = 0 ; | |
| 0 | 252 |
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253 #ifdef ASSERT |
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254 _visited_for_critical_count = false; |
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255 #endif |
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256 |
| 0 | 257 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 258 _suspend_flags = 0; | |
| 259 | |
| 260 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 261 _hashStateX = os::random() ; | |
| 262 _hashStateY = 842502087 ; | |
| 263 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 264 _hashStateW = 273326509 ; | |
| 265 | |
| 266 _OnTrap = 0 ; | |
| 267 _schedctl = NULL ; | |
| 268 _Stalled = 0 ; | |
| 269 _TypeTag = 0x2BAD ; | |
| 270 | |
| 271 // Many of the following fields are effectively final - immutable | |
| 272 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 273 // construct until the _MutexEvent is initialized ... | |
| 274 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 275 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 276 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 277 // and ::Release() | |
| 278 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 279 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 280 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 281 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 282 | |
| 283 #ifdef CHECK_UNHANDLED_OOPS | |
| 284 if (CheckUnhandledOops) { | |
| 285 _unhandled_oops = new UnhandledOops(this); | |
| 286 } | |
| 287 #endif // CHECK_UNHANDLED_OOPS | |
| 288 #ifdef ASSERT | |
| 289 if (UseBiasedLocking) { | |
| 290 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 291 assert(this == _real_malloc_address || | |
| 292 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 293 "bug in forced alignment of thread objects"); | |
| 294 } | |
| 295 #endif /* ASSERT */ | |
| 296 } | |
| 297 | |
| 298 void Thread::initialize_thread_local_storage() { | |
| 299 // Note: Make sure this method only calls | |
| 300 // non-blocking operations. Otherwise, it might not work | |
| 301 // with the thread-startup/safepoint interaction. | |
| 302 | |
| 303 // During Java thread startup, safepoint code should allow this | |
| 304 // method to complete because it may need to allocate memory to | |
| 305 // store information for the new thread. | |
| 306 | |
| 307 // initialize structure dependent on thread local storage | |
| 308 ThreadLocalStorage::set_thread(this); | |
| 309 } | |
| 310 | |
| 311 void Thread::record_stack_base_and_size() { | |
| 312 set_stack_base(os::current_stack_base()); | |
| 313 set_stack_size(os::current_stack_size()); | |
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314 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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315 // in initialize_thread(). Without the adjustment, stack size is |
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316 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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317 // So far, only Solaris has real implementation of initialize_thread(). |
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318 // |
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319 // set up any platform-specific state. |
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320 os::initialize_thread(this); |
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321 |
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322 #if INCLUDE_NMT |
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323 // record thread's native stack, stack grows downward |
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324 address stack_low_addr = stack_base() - stack_size(); |
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325 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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326 CURRENT_PC); |
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327 #endif // INCLUDE_NMT |
| 0 | 328 } |
| 329 | |
| 330 | |
| 331 Thread::~Thread() { | |
| 332 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 333 ObjectSynchronizer::omFlush (this) ; | |
| 334 | |
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335 // stack_base can be NULL if the thread is never started or exited before |
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336 // record_stack_base_and_size called. Although, we would like to ensure |
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337 // that all started threads do call record_stack_base_and_size(), there is |
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338 // not proper way to enforce that. |
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339 #if INCLUDE_NMT |
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340 if (_stack_base != NULL) { |
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341 address low_stack_addr = stack_base() - stack_size(); |
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342 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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343 #ifdef ASSERT |
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344 set_stack_base(NULL); |
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345 #endif |
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346 } |
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347 #endif // INCLUDE_NMT |
| 6197 | 348 |
| 0 | 349 // deallocate data structures |
| 350 delete resource_area(); | |
| 351 // since the handle marks are using the handle area, we have to deallocated the root | |
| 352 // handle mark before deallocating the thread's handle area, | |
| 353 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 354 delete last_handle_mark(); | |
| 355 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 356 | |
| 357 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 358 // We NULL out the fields for good hygiene. | |
| 359 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 360 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 361 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 362 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 363 | |
| 364 delete handle_area(); | |
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365 delete metadata_handles(); |
| 0 | 366 |
| 367 // osthread() can be NULL, if creation of thread failed. | |
| 368 if (osthread() != NULL) os::free_thread(osthread()); | |
| 369 | |
| 370 delete _SR_lock; | |
| 371 | |
| 372 // clear thread local storage if the Thread is deleting itself | |
| 373 if (this == Thread::current()) { | |
| 374 ThreadLocalStorage::set_thread(NULL); | |
| 375 } else { | |
| 376 // In the case where we're not the current thread, invalidate all the | |
| 377 // caches in case some code tries to get the current thread or the | |
| 378 // thread that was destroyed, and gets stale information. | |
| 379 ThreadLocalStorage::invalidate_all(); | |
| 380 } | |
| 381 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 382 } | |
| 383 | |
| 384 // NOTE: dummy function for assertion purpose. | |
| 385 void Thread::run() { | |
| 386 ShouldNotReachHere(); | |
| 387 } | |
| 388 | |
| 389 #ifdef ASSERT | |
| 390 // Private method to check for dangling thread pointer | |
| 391 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 392 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 393 "possibility of dangling Thread pointer"); | |
| 394 } | |
| 395 #endif | |
| 396 | |
| 397 | |
| 398 #ifndef PRODUCT | |
| 399 // Tracing method for basic thread operations | |
| 400 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 401 if (!TraceThreadEvents) return; | |
| 402 ResourceMark rm; | |
| 403 ThreadCritical tc; | |
| 404 const char *name = "non-Java thread"; | |
| 405 int prio = -1; | |
| 406 if (thread->is_Java_thread() | |
| 407 && !thread->is_Compiler_thread()) { | |
| 408 // The Threads_lock must be held to get information about | |
| 409 // this thread but may not be in some situations when | |
| 410 // tracing thread events. | |
| 411 bool release_Threads_lock = false; | |
| 412 if (!Threads_lock->owned_by_self()) { | |
| 413 Threads_lock->lock(); | |
| 414 release_Threads_lock = true; | |
| 415 } | |
| 416 JavaThread* jt = (JavaThread *)thread; | |
| 417 name = (char *)jt->get_thread_name(); | |
| 418 oop thread_oop = jt->threadObj(); | |
| 419 if (thread_oop != NULL) { | |
| 420 prio = java_lang_Thread::priority(thread_oop); | |
| 421 } | |
| 422 if (release_Threads_lock) { | |
| 423 Threads_lock->unlock(); | |
| 424 } | |
| 425 } | |
| 426 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 427 } | |
| 428 #endif | |
| 429 | |
| 430 | |
| 431 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 432 trace("get priority", thread); | |
| 433 ThreadPriority priority; | |
| 434 // Can return an error! | |
| 435 (void)os::get_priority(thread, priority); | |
| 436 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 437 return priority; | |
| 438 } | |
| 439 | |
| 440 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 441 trace("set priority", thread); | |
| 442 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 443 // Can return an error! | |
| 444 (void)os::set_priority(thread, priority); | |
| 445 } | |
| 446 | |
| 447 | |
| 448 void Thread::start(Thread* thread) { | |
| 449 trace("start", thread); | |
| 450 // Start is different from resume in that its safety is guaranteed by context or | |
| 451 // being called from a Java method synchronized on the Thread object. | |
| 452 if (!DisableStartThread) { | |
| 453 if (thread->is_Java_thread()) { | |
| 454 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 455 // Can not set it after the thread started because we do not know the | |
| 456 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 457 // in SLEEPING or some other state. | |
| 458 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 459 java_lang_Thread::RUNNABLE); | |
| 460 } | |
| 461 os::start_thread(thread); | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 466 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 467 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 468 VMThread::execute(vm_stop); | |
| 469 } | |
| 470 | |
| 471 | |
| 472 // | |
| 473 // Check if an external suspend request has completed (or has been | |
| 474 // cancelled). Returns true if the thread is externally suspended and | |
| 475 // false otherwise. | |
| 476 // | |
| 477 // The bits parameter returns information about the code path through | |
| 478 // the routine. Useful for debugging: | |
| 479 // | |
| 480 // set in is_ext_suspend_completed(): | |
| 481 // 0x00000001 - routine was entered | |
| 482 // 0x00000010 - routine return false at end | |
| 483 // 0x00000100 - thread exited (return false) | |
| 484 // 0x00000200 - suspend request cancelled (return false) | |
| 485 // 0x00000400 - thread suspended (return true) | |
| 486 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 487 // 0x00002000 - thread is native and walkable (return true) | |
| 488 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 489 // | |
| 490 // set in wait_for_ext_suspend_completion(): | |
| 491 // 0x00010000 - routine was entered | |
| 492 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 493 // 0x00040000 - thread suspended before loop (return true) | |
| 494 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 495 // 0x00100000 - thread suspended in loop (return true) | |
| 496 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 497 // | |
| 498 | |
| 499 // Helper class for tracing suspend wait debug bits. | |
| 500 // | |
| 501 // 0x00000100 indicates that the target thread exited before it could | |
| 502 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 503 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 504 // count as wait failures either. | |
| 505 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 506 | |
| 507 class TraceSuspendDebugBits : public StackObj { | |
| 508 private: | |
| 509 JavaThread * jt; | |
| 510 bool is_wait; | |
| 511 bool called_by_wait; // meaningful when !is_wait | |
| 512 uint32_t * bits; | |
| 513 | |
| 514 public: | |
| 515 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 516 uint32_t *_bits) { | |
| 517 jt = _jt; | |
| 518 is_wait = _is_wait; | |
| 519 called_by_wait = _called_by_wait; | |
| 520 bits = _bits; | |
| 521 } | |
| 522 | |
| 523 ~TraceSuspendDebugBits() { | |
| 524 if (!is_wait) { | |
| 525 #if 1 | |
| 526 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 527 // That trace is very chatty. | |
| 528 return; | |
| 529 #else | |
| 530 if (!called_by_wait) { | |
| 531 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 532 // trace calls to it from wait_for_ext_suspend_completion() | |
| 533 return; | |
| 534 } | |
| 535 #endif | |
| 536 } | |
| 537 | |
| 538 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 539 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 540 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 541 ResourceMark rm; | |
| 542 | |
| 543 tty->print_cr( | |
| 544 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 545 jt->get_thread_name(), *bits); | |
| 546 | |
| 547 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 548 } | |
| 549 } | |
| 550 } | |
| 551 }; | |
| 552 #undef DEBUG_FALSE_BITS | |
| 553 | |
| 554 | |
| 555 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 556 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 557 | |
| 558 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 559 bool do_trans_retry; // flag to force the retry | |
| 560 | |
| 561 *bits |= 0x00000001; | |
| 562 | |
| 563 do { | |
| 564 do_trans_retry = false; | |
| 565 | |
| 566 if (is_exiting()) { | |
| 567 // Thread is in the process of exiting. This is always checked | |
| 568 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 569 *bits |= 0x00000100; | |
| 570 return false; | |
| 571 } | |
| 572 | |
| 573 if (!is_external_suspend()) { | |
| 574 // Suspend request is cancelled. This is always checked before | |
| 575 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 576 // confusing the thread that made the suspend request. | |
| 577 *bits |= 0x00000200; | |
| 578 return false; | |
| 579 } | |
| 580 | |
| 581 if (is_ext_suspended()) { | |
| 582 // thread is suspended | |
| 583 *bits |= 0x00000400; | |
| 584 return true; | |
| 585 } | |
| 586 | |
| 587 // Now that we no longer do hard suspends of threads running | |
| 588 // native code, the target thread can be changing thread state | |
| 589 // while we are in this routine: | |
| 590 // | |
| 591 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 592 // | |
| 593 // We save a copy of the thread state as observed at this moment | |
| 594 // and make our decision about suspend completeness based on the | |
| 595 // copy. This closes the race where the thread state is seen as | |
| 596 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 597 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 598 JavaThreadState save_state = thread_state(); | |
| 599 | |
| 600 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 601 // If the thread's state is _thread_blocked and this blocking | |
| 602 // condition is known to be equivalent to a suspend, then we can | |
| 603 // consider the thread to be externally suspended. This means that | |
| 604 // the code that sets _thread_blocked has been modified to do | |
| 605 // self-suspension if the blocking condition releases. We also | |
| 606 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 607 // the _thread_blocked with self-suspension check. | |
| 608 // | |
| 609 // Return true since we wouldn't be here unless there was still an | |
| 610 // external suspend request. | |
| 611 *bits |= 0x00001000; | |
| 612 return true; | |
| 613 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 614 // Threads running native code will self-suspend on native==>VM/Java | |
| 615 // transitions. If its stack is walkable (should always be the case | |
| 616 // unless this function is called before the actual java_suspend() | |
| 617 // call), then the wait is done. | |
| 618 *bits |= 0x00002000; | |
| 619 return true; | |
| 620 } else if (!called_by_wait && !did_trans_retry && | |
| 621 save_state == _thread_in_native_trans && | |
| 622 frame_anchor()->walkable()) { | |
| 623 // The thread is transitioning from thread_in_native to another | |
| 624 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 625 // will force the thread to self-suspend. If it hasn't gotten | |
| 626 // there yet we may have caught the thread in-between the native | |
| 627 // code check above and the self-suspend. Lucky us. If we were | |
| 628 // called by wait_for_ext_suspend_completion(), then it | |
| 629 // will be doing the retries so we don't have to. | |
| 630 // | |
| 631 // Since we use the saved thread state in the if-statement above, | |
| 632 // there is a chance that the thread has already transitioned to | |
| 633 // _thread_blocked by the time we get here. In that case, we will | |
| 634 // make a single unnecessary pass through the logic below. This | |
| 635 // doesn't hurt anything since we still do the trans retry. | |
| 636 | |
| 637 *bits |= 0x00004000; | |
| 638 | |
| 639 // Once the thread leaves thread_in_native_trans for another | |
| 640 // thread state, we break out of this retry loop. We shouldn't | |
| 641 // need this flag to prevent us from getting back here, but | |
| 642 // sometimes paranoia is good. | |
| 643 did_trans_retry = true; | |
| 644 | |
| 645 // We wait for the thread to transition to a more usable state. | |
| 646 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 647 // We used to do an "os::yield_all(i)" call here with the intention | |
| 648 // that yielding would increase on each retry. However, the parameter | |
| 649 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 650 // on the SR_lock below provides a much more predictable scale up for | |
| 651 // the delay. It also provides a simple/direct point to check for any | |
| 652 // safepoint requests from the VMThread | |
| 653 | |
| 654 // temporarily drops SR_lock while doing wait with safepoint check | |
| 655 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 656 // and increase delay with each retry | |
| 657 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 658 | |
| 659 // check the actual thread state instead of what we saved above | |
| 660 if (thread_state() != _thread_in_native_trans) { | |
| 661 // the thread has transitioned to another thread state so | |
| 662 // try all the checks (except this one) one more time. | |
| 663 do_trans_retry = true; | |
| 664 break; | |
| 665 } | |
| 666 } // end retry loop | |
| 667 | |
| 668 | |
| 669 } | |
| 670 } while (do_trans_retry); | |
| 671 | |
| 672 *bits |= 0x00000010; | |
| 673 return false; | |
| 674 } | |
| 675 | |
| 676 // | |
| 677 // Wait for an external suspend request to complete (or be cancelled). | |
| 678 // Returns true if the thread is externally suspended and false otherwise. | |
| 679 // | |
| 680 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 681 uint32_t *bits) { | |
| 682 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 683 false /* !called_by_wait */, bits); | |
| 684 | |
| 685 // local flag copies to minimize SR_lock hold time | |
| 686 bool is_suspended; | |
| 687 bool pending; | |
| 688 uint32_t reset_bits; | |
| 689 | |
| 690 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 691 *bits |= 0x00010000; | |
| 692 | |
| 693 // We use reset_bits to reinitialize the bits value at the top of | |
| 694 // each retry loop. This allows the caller to make use of any | |
| 695 // unused bits for their own marking purposes. | |
| 696 reset_bits = *bits; | |
| 697 | |
| 698 { | |
| 699 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 700 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 701 delay, bits); | |
| 702 pending = is_external_suspend(); | |
| 703 } | |
| 704 // must release SR_lock to allow suspension to complete | |
| 705 | |
| 706 if (!pending) { | |
| 707 // A cancelled suspend request is the only false return from | |
| 708 // is_ext_suspend_completed() that keeps us from entering the | |
| 709 // retry loop. | |
| 710 *bits |= 0x00020000; | |
| 711 return false; | |
| 712 } | |
| 713 | |
| 714 if (is_suspended) { | |
| 715 *bits |= 0x00040000; | |
| 716 return true; | |
| 717 } | |
| 718 | |
| 719 for (int i = 1; i <= retries; i++) { | |
| 720 *bits = reset_bits; // reinit to only track last retry | |
| 721 | |
| 722 // We used to do an "os::yield_all(i)" call here with the intention | |
| 723 // that yielding would increase on each retry. However, the parameter | |
| 724 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 725 // on the SR_lock below provides a much more predictable scale up for | |
| 726 // the delay. It also provides a simple/direct point to check for any | |
| 727 // safepoint requests from the VMThread | |
| 728 | |
| 729 { | |
| 730 MutexLocker ml(SR_lock()); | |
| 731 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 732 // can also call this) and increase delay with each retry | |
| 733 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 734 | |
| 735 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 736 delay, bits); | |
| 737 | |
| 738 // It is possible for the external suspend request to be cancelled | |
| 739 // (by a resume) before the actual suspend operation is completed. | |
| 740 // Refresh our local copy to see if we still need to wait. | |
| 741 pending = is_external_suspend(); | |
| 742 } | |
| 743 | |
| 744 if (!pending) { | |
| 745 // A cancelled suspend request is the only false return from | |
| 746 // is_ext_suspend_completed() that keeps us from staying in the | |
| 747 // retry loop. | |
| 748 *bits |= 0x00080000; | |
| 749 return false; | |
| 750 } | |
| 751 | |
| 752 if (is_suspended) { | |
| 753 *bits |= 0x00100000; | |
| 754 return true; | |
| 755 } | |
| 756 } // end retry loop | |
| 757 | |
| 758 // thread did not suspend after all our retries | |
| 759 *bits |= 0x00200000; | |
| 760 return false; | |
| 761 } | |
| 762 | |
| 763 #ifndef PRODUCT | |
| 764 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 765 | |
| 766 // This should not need to be atomic as the only way for simultaneous | |
| 767 // updates is via interrupts. Even then this should be rare or non-existant | |
| 768 // and we don't care that much anyway. | |
| 769 | |
| 770 int index = _jmp_ring_index; | |
| 771 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 772 _jmp_ring[index]._target = (intptr_t) target; | |
| 773 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 774 _jmp_ring[index]._file = file; | |
| 775 _jmp_ring[index]._line = line; | |
| 776 } | |
| 777 #endif /* PRODUCT */ | |
| 778 | |
| 779 // Called by flat profiler | |
| 780 // Callers have already called wait_for_ext_suspend_completion | |
| 781 // The assertion for that is currently too complex to put here: | |
| 782 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 783 bool gotframe = false; | |
| 784 // self suspension saves needed state. | |
| 785 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 786 *_fr = pd_last_frame(); | |
| 787 gotframe = true; | |
| 788 } | |
| 789 return gotframe; | |
| 790 } | |
| 791 | |
| 792 void Thread::interrupt(Thread* thread) { | |
| 793 trace("interrupt", thread); | |
| 794 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 795 os::interrupt(thread); | |
| 796 } | |
| 797 | |
| 798 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 799 trace("is_interrupted", thread); | |
| 800 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 801 // Note: If clear_interrupted==false, this simply fetches and | |
| 802 // returns the value of the field osthread()->interrupted(). | |
| 803 return os::is_interrupted(thread, clear_interrupted); | |
| 804 } | |
| 805 | |
| 806 | |
| 807 // GC Support | |
| 808 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 809 jint thread_parity = _oops_do_parity; | |
| 810 if (thread_parity != strong_roots_parity) { | |
| 811 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
|
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812 if (res == thread_parity) { |
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813 return true; |
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814 } else { |
| 0 | 815 guarantee(res == strong_roots_parity, "Or else what?"); |
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816 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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817 "Should only fail when parallel."); |
| 0 | 818 return false; |
| 819 } | |
| 820 } | |
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821 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 822 "Should only fail when parallel."); |
| 823 return false; | |
| 824 } | |
| 825 | |
|
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826 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 827 active_handles()->oops_do(f); |
| 828 // Do oop for ThreadShadow | |
| 829 f->do_oop((oop*)&_pending_exception); | |
| 830 handle_area()->oops_do(f); | |
| 831 } | |
| 832 | |
|
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833 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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834 // no nmethods in a generic thread... |
| 0 | 835 } |
| 836 | |
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837 void Thread::metadata_do(void f(Metadata*)) { |
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838 if (metadata_handles() != NULL) { |
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839 for (int i = 0; i< metadata_handles()->length(); i++) { |
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840 f(metadata_handles()->at(i)); |
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841 } |
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842 } |
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843 } |
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844 |
| 0 | 845 void Thread::print_on(outputStream* st) const { |
| 846 // get_priority assumes osthread initialized | |
| 847 if (osthread() != NULL) { | |
| 6766 | 848 int os_prio; |
| 849 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 850 st->print("os_prio=%d ", os_prio); | |
| 851 } | |
| 852 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 853 osthread()->print_on(st); |
| 854 } | |
| 855 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 856 } | |
| 857 | |
| 858 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 859 // any lock or allocate memory. | |
| 860 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 861 if (is_VM_thread()) st->print("VMThread"); | |
| 862 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 863 else if (is_Java_thread()) st->print("JavaThread"); | |
| 864 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 865 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 866 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 867 else st->print("Thread"); | |
| 868 | |
| 869 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 870 _stack_base - _stack_size, _stack_base); | |
| 871 | |
| 872 if (osthread()) { | |
| 873 st->print(" [id=%d]", osthread()->thread_id()); | |
| 874 } | |
| 875 } | |
| 876 | |
| 877 #ifdef ASSERT | |
| 878 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 879 Monitor *cur = _owned_locks; | |
| 880 if (cur == NULL) { | |
| 881 st->print(" (no locks) "); | |
| 882 } else { | |
| 883 st->print_cr(" Locks owned:"); | |
| 884 while(cur) { | |
| 885 cur->print_on(st); | |
| 886 cur = cur->next(); | |
| 887 } | |
| 888 } | |
| 889 } | |
| 890 | |
| 891 static int ref_use_count = 0; | |
| 892 | |
| 893 bool Thread::owns_locks_but_compiled_lock() const { | |
| 894 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 895 if (cur != Compile_lock) return true; | |
| 896 } | |
| 897 return false; | |
| 898 } | |
| 899 | |
| 900 | |
| 901 #endif | |
| 902 | |
| 903 #ifndef PRODUCT | |
| 904 | |
| 905 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 906 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 907 // no threads which allow_vm_block's are held | |
| 908 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 909 // Check if current thread is allowed to block at a safepoint | |
| 910 if (!(_allow_safepoint_count == 0)) | |
| 911 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 912 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 913 fatal("LEAF method calling lock?"); | |
| 914 } | |
| 915 | |
| 916 #ifdef ASSERT | |
| 917 if (potential_vm_operation && is_Java_thread() | |
| 918 && !Universe::is_bootstrapping()) { | |
| 919 // Make sure we do not hold any locks that the VM thread also uses. | |
| 920 // This could potentially lead to deadlocks | |
| 921 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 922 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 923 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 924 // since it is used to transfer control between JavaThreads and the VMThread | |
| 925 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 926 if ( (cur->allow_vm_block() && | |
| 927 cur != Threads_lock && | |
| 928 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 929 cur != VMOperationRequest_lock && | |
| 930 cur != VMOperationQueue_lock) || | |
| 931 cur->rank() == Mutex::special) { | |
| 932 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 933 } | |
| 934 } | |
| 935 } | |
| 936 | |
| 937 if (GCALotAtAllSafepoints) { | |
| 938 // We could enter a safepoint here and thus have a gc | |
| 939 InterfaceSupport::check_gc_alot(); | |
| 940 } | |
| 941 #endif | |
| 942 } | |
| 943 #endif | |
| 944 | |
| 945 bool Thread::is_in_stack(address adr) const { | |
| 946 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 947 address end = os::current_stack_pointer(); | |
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948 // Allow non Java threads to call this without stack_base |
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949 if (_stack_base == NULL) return true; |
| 0 | 950 if (stack_base() >= adr && adr >= end) return true; |
| 951 | |
| 952 return false; | |
| 953 } | |
| 954 | |
| 955 | |
| 956 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 957 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 958 // used for compilation in the future. If that change is made, the need for these methods | |
| 959 // should be revisited, and they should be removed if possible. | |
| 960 | |
| 961 bool Thread::is_lock_owned(address adr) const { | |
|
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962 return on_local_stack(adr); |
| 0 | 963 } |
| 964 | |
| 965 bool Thread::set_as_starting_thread() { | |
| 966 // NOTE: this must be called inside the main thread. | |
| 967 return os::create_main_thread((JavaThread*)this); | |
| 968 } | |
| 969 | |
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970 static void initialize_class(Symbol* class_name, TRAPS) { |
|
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971 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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972 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 973 } |
| 974 | |
| 975 | |
| 976 // Creates the initial ThreadGroup | |
| 977 static Handle create_initial_thread_group(TRAPS) { | |
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978 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 979 instanceKlassHandle klass (THREAD, k); |
| 980 | |
| 981 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 982 { | |
| 983 JavaValue result(T_VOID); | |
| 984 JavaCalls::call_special(&result, | |
| 985 system_instance, | |
| 986 klass, | |
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987 vmSymbols::object_initializer_name(), |
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988 vmSymbols::void_method_signature(), |
| 0 | 989 CHECK_NH); |
| 990 } | |
| 991 Universe::set_system_thread_group(system_instance()); | |
| 992 | |
| 993 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 994 { | |
| 995 JavaValue result(T_VOID); | |
| 996 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 997 JavaCalls::call_special(&result, | |
| 998 main_instance, | |
| 999 klass, | |
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1000 vmSymbols::object_initializer_name(), |
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1001 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1002 system_instance, |
| 1003 string, | |
| 1004 CHECK_NH); | |
| 1005 } | |
| 1006 return main_instance; | |
| 1007 } | |
| 1008 | |
| 1009 // Creates the initial Thread | |
| 1010 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
|
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1011 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1012 instanceKlassHandle klass (THREAD, k); |
| 1013 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1014 | |
| 1015 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1016 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1017 thread->set_threadObj(thread_oop()); | |
| 1018 | |
| 1019 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1020 | |
| 1021 JavaValue result(T_VOID); | |
| 1022 JavaCalls::call_special(&result, thread_oop, | |
| 1023 klass, | |
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1024 vmSymbols::object_initializer_name(), |
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1025 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1026 thread_group, |
| 1027 string, | |
| 1028 CHECK_NULL); | |
| 1029 return thread_oop(); | |
| 1030 } | |
| 1031 | |
| 1032 static void call_initializeSystemClass(TRAPS) { | |
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1033 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1034 instanceKlassHandle klass (THREAD, k); |
| 1035 | |
| 1036 JavaValue result(T_VOID); | |
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1037 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1038 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1039 } |
| 1040 | |
| 6181 | 1041 char java_runtime_name[128] = ""; |
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1042 char java_runtime_version[128] = ""; |
| 6181 | 1043 |
| 1044 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1045 static const char* get_java_runtime_name(TRAPS) { | |
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1046 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1047 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1048 fieldDescriptor fd; | |
| 1049 bool found = k != NULL && | |
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1050 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1051 vmSymbols::string_signature(), &fd); |
| 1052 if (found) { | |
| 1053 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1054 if (name_oop == NULL) | |
| 1055 return NULL; | |
| 1056 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1057 java_runtime_name, | |
| 1058 sizeof(java_runtime_name)); | |
| 1059 return name; | |
| 1060 } else { | |
| 1061 return NULL; | |
| 1062 } | |
| 1063 } | |
| 1064 | |
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1065 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1066 static const char* get_java_runtime_version(TRAPS) { |
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1067 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1068 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1069 fieldDescriptor fd; |
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1070 bool found = k != NULL && |
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1071 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1072 vmSymbols::string_signature(), &fd); |
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1073 if (found) { |
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1074 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1075 if (name_oop == NULL) |
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1076 return NULL; |
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1077 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1078 java_runtime_version, |
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1079 sizeof(java_runtime_version)); |
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1080 return name; |
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1081 } else { |
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1082 return NULL; |
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1083 } |
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1084 } |
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1085 |
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1086 // General purpose hook into Java code, run once when the VM is initialized. |
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1087 // The Java library method itself may be changed independently from the VM. |
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1088 static void call_postVMInitHook(TRAPS) { |
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1089 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1090 instanceKlassHandle klass (THREAD, k); |
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1091 if (klass.not_null()) { |
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1092 JavaValue result(T_VOID); |
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1093 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1094 vmSymbols::void_method_signature(), |
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1095 CHECK); |
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1096 } |
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1097 } |
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1098 |
| 0 | 1099 static void reset_vm_info_property(TRAPS) { |
| 1100 // the vm info string | |
| 1101 ResourceMark rm(THREAD); | |
| 1102 const char *vm_info = VM_Version::vm_info_string(); | |
| 1103 | |
| 1104 // java.lang.System class | |
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1105 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1106 instanceKlassHandle klass (THREAD, k); |
| 1107 | |
| 1108 // setProperty arguments | |
| 1109 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1110 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1111 | |
| 1112 // return value | |
| 1113 JavaValue r(T_OBJECT); | |
| 1114 | |
| 1115 // public static String setProperty(String key, String value); | |
| 1116 JavaCalls::call_static(&r, | |
| 1117 klass, | |
|
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1118 vmSymbols::setProperty_name(), |
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1119 vmSymbols::string_string_string_signature(), |
| 0 | 1120 key_str, |
| 1121 value_str, | |
| 1122 CHECK); | |
| 1123 } | |
| 1124 | |
| 1125 | |
| 1126 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1127 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1128 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1129 | |
|
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1130 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1131 instanceKlassHandle klass (THREAD, k); |
| 1132 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1133 | |
| 1134 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1135 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1136 set_threadObj(thread_oop()); | |
| 1137 | |
| 1138 JavaValue result(T_VOID); | |
| 1139 if (thread_name != NULL) { | |
| 1140 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1141 // Thread gets assigned specified name and null target | |
| 1142 JavaCalls::call_special(&result, | |
| 1143 thread_oop, | |
| 1144 klass, | |
|
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1145 vmSymbols::object_initializer_name(), |
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1146 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1147 thread_group, // Argument 1 |
| 1148 name, // Argument 2 | |
| 1149 THREAD); | |
| 1150 } else { | |
| 1151 // Thread gets assigned name "Thread-nnn" and null target | |
| 1152 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1153 JavaCalls::call_special(&result, | |
| 1154 thread_oop, | |
| 1155 klass, | |
|
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1156 vmSymbols::object_initializer_name(), |
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1157 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1158 thread_group, // Argument 1 |
| 1159 Handle(), // Argument 2 | |
| 1160 THREAD); | |
| 1161 } | |
| 1162 | |
| 1163 | |
| 1164 if (daemon) { | |
| 1165 java_lang_Thread::set_daemon(thread_oop()); | |
| 1166 } | |
| 1167 | |
| 1168 if (HAS_PENDING_EXCEPTION) { | |
| 1169 return; | |
| 1170 } | |
| 1171 | |
| 1142 | 1172 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1173 Handle threadObj(this, this->threadObj()); |
| 1174 | |
| 1175 JavaCalls::call_special(&result, | |
| 1176 thread_group, | |
| 1177 group, | |
|
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1178 vmSymbols::add_method_name(), |
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1179 vmSymbols::thread_void_signature(), |
| 0 | 1180 threadObj, // Arg 1 |
| 1181 THREAD); | |
| 1182 | |
| 1183 | |
| 1184 } | |
| 1185 | |
| 1186 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1187 // uniquely named instances should derive from this. | |
| 1188 NamedThread::NamedThread() : Thread() { | |
| 1189 _name = NULL; | |
|
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1190 _processed_thread = NULL; |
| 0 | 1191 } |
| 1192 | |
| 1193 NamedThread::~NamedThread() { | |
| 1194 if (_name != NULL) { | |
| 6197 | 1195 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1196 _name = NULL; |
| 1197 } | |
| 1198 } | |
| 1199 | |
| 1200 void NamedThread::set_name(const char* format, ...) { | |
| 1201 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1202 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1203 guarantee(_name != NULL, "alloc failure"); |
| 1204 va_list ap; | |
| 1205 va_start(ap, format); | |
| 1206 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1207 va_end(ap); | |
| 1208 } | |
| 1209 | |
| 1210 // ======= WatcherThread ======== | |
| 1211 | |
| 1212 // The watcher thread exists to simulate timer interrupts. It should | |
| 1213 // be replaced by an abstraction over whatever native support for | |
| 1214 // timer interrupts exists on the platform. | |
| 1215 | |
| 1216 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1217 bool WatcherThread::_startable = false; |
|
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1218 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1219 |
| 1220 WatcherThread::WatcherThread() : Thread() { | |
| 1221 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1222 if (os::create_thread(this, os::watcher_thread)) { | |
| 1223 _watcher_thread = this; | |
| 1224 | |
| 1225 // Set the watcher thread to the highest OS priority which should not be | |
| 1226 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1227 // is created. The only normal thread using this priority is the reference | |
| 1228 // handler thread, which runs for very short intervals only. | |
| 1229 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1230 // will be inaccurate. | |
| 1231 os::set_priority(this, MaxPriority); | |
| 1232 if (!DisableStartThread) { | |
| 1233 os::start_thread(this); | |
| 1234 } | |
| 1235 } | |
| 1236 } | |
| 1237 | |
|
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1238 int WatcherThread::sleep() const { |
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1239 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1240 |
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1241 // remaining will be zero if there are no tasks, |
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1242 // causing the WatcherThread to sleep until a task is |
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1243 // enrolled |
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1244 int remaining = PeriodicTask::time_to_wait(); |
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1245 int time_slept = 0; |
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1246 |
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1247 // we expect this to timeout - we only ever get unparked when |
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1248 // we should terminate or when a new task has been enrolled |
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1249 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1250 |
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1251 jlong time_before_loop = os::javaTimeNanos(); |
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1252 |
|
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1253 for (;;) { |
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1254 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1255 jlong now = os::javaTimeNanos(); |
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1256 |
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1257 if (remaining == 0) { |
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1258 // if we didn't have any tasks we could have waited for a long time |
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1259 // consider the time_slept zero and reset time_before_loop |
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1260 time_slept = 0; |
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1261 time_before_loop = now; |
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1262 } else { |
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1263 // need to recalulate since we might have new tasks in _tasks |
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1264 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1265 } |
|
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1266 |
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1267 // Change to task list or spurious wakeup of some kind |
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1268 if (timedout || _should_terminate) { |
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1269 break; |
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1270 } |
|
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1271 |
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1272 remaining = PeriodicTask::time_to_wait(); |
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1273 if (remaining == 0) { |
|
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1274 // Last task was just disenrolled so loop around and wait until |
|
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1275 // another task gets enrolled |
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1276 continue; |
|
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1277 } |
|
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1278 |
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1279 remaining -= time_slept; |
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1280 if (remaining <= 0) |
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1281 break; |
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1282 } |
|
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1283 |
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1284 return time_slept; |
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1285 } |
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1286 |
| 0 | 1287 void WatcherThread::run() { |
| 1288 assert(this == watcher_thread(), "just checking"); | |
| 1289 | |
| 1290 this->record_stack_base_and_size(); | |
| 1291 this->initialize_thread_local_storage(); | |
| 1292 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1293 while(!_should_terminate) { | |
| 1294 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1295 assert(watcher_thread() == this, "thread consistency check"); | |
| 1296 | |
| 1297 // Calculate how long it'll be until the next PeriodicTask work | |
| 1298 // should be done, and sleep that amount of time. | |
|
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1299 int time_waited = sleep(); |
| 0 | 1300 |
| 1301 if (is_error_reported()) { | |
| 1302 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1303 // should abort JVM after creating an error log file. However in some | |
| 1304 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1305 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1306 // | |
| 1307 // This code is in WatcherThread because WatcherThread wakes up | |
| 1308 // periodically so the fatal error handler doesn't need to do anything; | |
| 1309 // also because the WatcherThread is less likely to crash than other | |
| 1310 // threads. | |
| 1311 | |
| 1312 for (;;) { | |
| 1313 if (!ShowMessageBoxOnError | |
| 1314 && (OnError == NULL || OnError[0] == '\0') | |
| 1315 && Arguments::abort_hook() == NULL) { | |
| 1316 os::sleep(this, 2 * 60 * 1000, false); | |
| 1317 fdStream err(defaultStream::output_fd()); | |
| 1318 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1319 // skip atexit/vm_exit/vm_abort hooks | |
| 1320 os::die(); | |
| 1321 } | |
| 1322 | |
| 1323 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1324 // ShowMessageBoxOnError when it is ready to abort. | |
| 1325 os::sleep(this, 5 * 1000, false); | |
| 1326 } | |
| 1327 } | |
| 1328 | |
|
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1329 PeriodicTask::real_time_tick(time_waited); |
| 0 | 1330 } |
| 1331 | |
| 1332 // Signal that it is terminated | |
| 1333 { | |
| 1334 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1335 _watcher_thread = NULL; | |
| 1336 Terminator_lock->notify(); | |
| 1337 } | |
| 1338 | |
| 1339 // Thread destructor usually does this.. | |
| 1340 ThreadLocalStorage::set_thread(NULL); | |
| 1341 } | |
| 1342 | |
| 1343 void WatcherThread::start() { | |
|
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1344 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1345 |
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1346 if (watcher_thread() == NULL && _startable) { |
| 0 | 1347 _should_terminate = false; |
| 1348 // Create the single instance of WatcherThread | |
| 1349 new WatcherThread(); | |
| 1350 } | |
| 1351 } | |
| 1352 | |
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1353 void WatcherThread::make_startable() { |
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1354 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1355 _startable = true; |
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1356 } |
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1357 |
| 0 | 1358 void WatcherThread::stop() { |
|
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1359 { |
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1360 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1361 _should_terminate = true; |
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1362 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1363 |
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1364 WatcherThread* watcher = watcher_thread(); |
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1365 if (watcher != NULL) |
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1366 watcher->unpark(); |
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1367 } |
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1368 |
| 0 | 1369 // it is ok to take late safepoints here, if needed |
| 1370 MutexLocker mu(Terminator_lock); | |
|
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1371 |
| 0 | 1372 while(watcher_thread() != NULL) { |
| 1373 // This wait should make safepoint checks, wait without a timeout, | |
| 1374 // and wait as a suspend-equivalent condition. | |
| 1375 // | |
| 1376 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1377 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1378 // FlatProfiler task, is waiting for the external suspend request on | |
| 1379 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1380 // eventually timeout, but that takes time. Making this wait a | |
| 1381 // suspend-equivalent condition solves that timeout problem. | |
| 1382 // | |
| 1383 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1384 Mutex::_as_suspend_equivalent_flag); | |
| 1385 } | |
| 1386 } | |
| 1387 | |
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1388 void WatcherThread::unpark() { |
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1389 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1390 PeriodicTask_lock->notify(); |
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1391 } |
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1392 |
| 0 | 1393 void WatcherThread::print_on(outputStream* st) const { |
| 1394 st->print("\"%s\" ", name()); | |
| 1395 Thread::print_on(st); | |
| 1396 st->cr(); | |
| 1397 } | |
| 1398 | |
| 1399 // ======= JavaThread ======== | |
| 1400 | |
| 1401 // A JavaThread is a normal Java thread | |
| 1402 | |
| 1403 void JavaThread::initialize() { | |
| 1404 // Initialize fields | |
|
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1405 |
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1406 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1407 set_claimed_par_id(-1); |
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1408 |
| 0 | 1409 set_saved_exception_pc(NULL); |
| 1410 set_threadObj(NULL); | |
| 1411 _anchor.clear(); | |
| 1412 set_entry_point(NULL); | |
| 1413 set_jni_functions(jni_functions()); | |
| 1414 set_callee_target(NULL); | |
| 1415 set_vm_result(NULL); | |
| 1416 set_vm_result_2(NULL); | |
| 1417 set_vframe_array_head(NULL); | |
| 1418 set_vframe_array_last(NULL); | |
| 1419 set_deferred_locals(NULL); | |
| 1420 set_deopt_mark(NULL); | |
|
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1421 set_deopt_nmethod(NULL); |
| 0 | 1422 clear_must_deopt_id(); |
| 1423 set_monitor_chunks(NULL); | |
| 1424 set_next(NULL); | |
| 1425 set_thread_state(_thread_new); | |
|
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1426 #if INCLUDE_NMT |
| 6197 | 1427 set_recorder(NULL); |
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1428 #endif |
| 0 | 1429 _terminated = _not_terminated; |
| 1430 _privileged_stack_top = NULL; | |
| 1431 _array_for_gc = NULL; | |
| 1432 _suspend_equivalent = false; | |
| 1433 _in_deopt_handler = 0; | |
| 1434 _doing_unsafe_access = false; | |
| 1435 _stack_guard_state = stack_guard_unused; | |
| 1436 _exception_oop = NULL; | |
| 1437 _exception_pc = 0; | |
| 1438 _exception_handler_pc = 0; | |
| 1903 | 1439 _is_method_handle_return = 0; |
| 0 | 1440 _jvmti_thread_state= NULL; |
|
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1441 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1442 _jvmti_get_loaded_classes_closure = NULL; |
| 1443 _interp_only_mode = 0; | |
| 1444 _special_runtime_exit_condition = _no_async_condition; | |
| 1445 _pending_async_exception = NULL; | |
| 1446 _is_compiling = false; | |
| 1447 _thread_stat = NULL; | |
| 1448 _thread_stat = new ThreadStatistics(); | |
| 1449 _blocked_on_compilation = false; | |
| 1450 _jni_active_critical = 0; | |
| 1451 _do_not_unlock_if_synchronized = false; | |
| 1452 _cached_monitor_info = NULL; | |
| 1453 _parker = Parker::Allocate(this) ; | |
| 1454 | |
| 1455 #ifndef PRODUCT | |
| 1456 _jmp_ring_index = 0; | |
| 1457 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1458 record_jump(NULL, NULL, NULL, 0); | |
| 1459 } | |
| 1460 #endif /* PRODUCT */ | |
| 1461 | |
| 1462 set_thread_profiler(NULL); | |
| 1463 if (FlatProfiler::is_active()) { | |
| 1464 // This is where we would decide to either give each thread it's own profiler | |
| 1465 // or use one global one from FlatProfiler, | |
| 1466 // or up to some count of the number of profiled threads, etc. | |
| 1467 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1468 pp->engage(); | |
| 1469 set_thread_profiler(pp); | |
| 1470 } | |
| 1471 | |
| 1472 // Setup safepoint state info for this thread | |
| 1473 ThreadSafepointState::create(this); | |
| 1474 | |
| 1475 debug_only(_java_call_counter = 0); | |
| 1476 | |
| 1477 // JVMTI PopFrame support | |
| 1478 _popframe_condition = popframe_inactive; | |
| 1479 _popframe_preserved_args = NULL; | |
| 1480 _popframe_preserved_args_size = 0; | |
| 1481 | |
| 1482 pd_initialize(); | |
| 1483 } | |
| 1484 | |
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1485 #ifndef SERIALGC |
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1486 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1487 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1488 #endif // !SERIALGC |
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1489 |
| 4006 | 1490 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1491 Thread() |
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1492 #ifndef SERIALGC |
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1493 , _satb_mark_queue(&_satb_mark_queue_set), |
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1494 _dirty_card_queue(&_dirty_card_queue_set) |
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1495 #endif // !SERIALGC |
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1496 { |
| 0 | 1497 initialize(); |
| 4006 | 1498 if (is_attaching_via_jni) { |
| 1499 _jni_attach_state = _attaching_via_jni; | |
| 1500 } else { | |
| 1501 _jni_attach_state = _not_attaching_via_jni; | |
| 1502 } | |
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1503 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 6197 | 1504 _safepoint_visible = false; |
| 0 | 1505 } |
| 1506 | |
| 1507 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1508 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1509 return true; // Stack already guarded or guard pages not needed. | |
| 1510 } | |
| 1511 | |
| 1512 if (register_stack_overflow()) { | |
| 1513 // For those architectures which have separate register and | |
| 1514 // memory stacks, we must check the register stack to see if | |
| 1515 // it has overflowed. | |
| 1516 return false; | |
| 1517 } | |
| 1518 | |
| 1519 // Java code never executes within the yellow zone: the latter is only | |
| 1520 // there to provoke an exception during stack banging. If java code | |
| 1521 // is executing there, either StackShadowPages should be larger, or | |
| 1522 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1523 // when it should. | |
| 1524 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1525 | |
| 1526 enable_stack_yellow_zone(); | |
| 1527 return true; | |
| 1528 } | |
| 1529 | |
| 1530 bool JavaThread::reguard_stack(void) { | |
| 1531 return reguard_stack(os::current_stack_pointer()); | |
| 1532 } | |
| 1533 | |
| 1534 | |
| 1535 void JavaThread::block_if_vm_exited() { | |
| 1536 if (_terminated == _vm_exited) { | |
| 1537 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1538 // we will block here forever | |
| 1539 Threads_lock->lock_without_safepoint_check(); | |
| 1540 ShouldNotReachHere(); | |
| 1541 } | |
| 1542 } | |
| 1543 | |
| 1544 | |
| 1545 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1546 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1547 | |
|
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1548 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1549 Thread() |
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1550 #ifndef SERIALGC |
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1551 , _satb_mark_queue(&_satb_mark_queue_set), |
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1552 _dirty_card_queue(&_dirty_card_queue_set) |
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1553 #endif // !SERIALGC |
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1554 { |
| 0 | 1555 if (TraceThreadEvents) { |
| 1556 tty->print_cr("creating thread %p", this); | |
| 1557 } | |
| 1558 initialize(); | |
| 4006 | 1559 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1560 set_entry_point(entry_point); |
| 1561 // Create the native thread itself. | |
| 1562 // %note runtime_23 | |
| 1563 os::ThreadType thr_type = os::java_thread; | |
| 1564 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1565 os::java_thread; | |
| 1566 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1567 _safepoint_visible = false; |
| 0 | 1568 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1569 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1570 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1571 // the exception consists of creating the exception object & initializing it, initialization | |
| 1572 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1573 // | |
| 1574 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1575 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1576 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1577 // object must be fully initialized (take a look at JVM_Start) | |
| 1578 } | |
| 1579 | |
| 1580 JavaThread::~JavaThread() { | |
| 1581 if (TraceThreadEvents) { | |
| 1582 tty->print_cr("terminate thread %p", this); | |
| 1583 } | |
| 1584 | |
|
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1585 // By now, this thread should already be invisible to safepoint, |
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1586 // and its per-thread recorder also collected. |
| 6197 | 1587 assert(!is_safepoint_visible(), "wrong state"); |
|
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1588 #if INCLUDE_NMT |
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1589 assert(get_recorder() == NULL, "Already collected"); |
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1590 #endif // INCLUDE_NMT |
| 6197 | 1591 |
| 0 | 1592 // JSR166 -- return the parker to the free list |
| 1593 Parker::Release(_parker); | |
| 1594 _parker = NULL ; | |
| 1595 | |
| 1596 // Free any remaining previous UnrollBlock | |
| 1597 vframeArray* old_array = vframe_array_last(); | |
| 1598 | |
| 1599 if (old_array != NULL) { | |
| 1600 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1601 old_array->set_unroll_block(NULL); | |
| 1602 delete old_info; | |
| 1603 delete old_array; | |
| 1604 } | |
| 1605 | |
| 1606 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1607 if (deferred != NULL) { | |
| 1608 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1609 assert(deferred->length() != 0, "empty array!"); | |
| 1610 do { | |
| 1611 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1612 deferred->remove_at(0); | |
| 1613 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1614 delete dlv; | |
| 1615 } while (deferred->length() != 0); | |
| 1616 delete deferred; | |
| 1617 } | |
| 1618 | |
| 1619 // All Java related clean up happens in exit | |
| 1620 ThreadSafepointState::destroy(this); | |
| 1621 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1622 if (_thread_stat != NULL) delete _thread_stat; | |
| 1623 } | |
| 1624 | |
| 1625 | |
| 1626 // The first routine called by a new Java thread | |
| 1627 void JavaThread::run() { | |
| 1628 // initialize thread-local alloc buffer related fields | |
| 1629 this->initialize_tlab(); | |
| 1630 | |
| 1631 // used to test validitity of stack trace backs | |
| 1632 this->record_base_of_stack_pointer(); | |
| 1633 | |
| 1634 // Record real stack base and size. | |
| 1635 this->record_stack_base_and_size(); | |
| 1636 | |
| 1637 // Initialize thread local storage; set before calling MutexLocker | |
| 1638 this->initialize_thread_local_storage(); | |
| 1639 | |
| 1640 this->create_stack_guard_pages(); | |
| 1641 | |
|
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1642 this->cache_global_variables(); |
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1643 |
| 0 | 1644 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1645 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1646 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1647 | |
| 1648 assert(JavaThread::current() == this, "sanity check"); | |
| 1649 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1650 | |
| 1651 DTRACE_THREAD_PROBE(start, this); | |
| 1652 | |
| 1653 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1654 // been completed. | |
| 1655 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1656 | |
| 1657 if (JvmtiExport::should_post_thread_life()) { | |
| 1658 JvmtiExport::post_thread_start(this); | |
| 1659 } | |
| 1660 | |
|
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1661 EVENT_BEGIN(TraceEventThreadStart, event); |
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1662 EVENT_COMMIT(event, |
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1663 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1664 |
| 0 | 1665 // We call another function to do the rest so we are sure that the stack addresses used |
| 1666 // from there will be lower than the stack base just computed | |
| 1667 thread_main_inner(); | |
| 1668 | |
| 1669 // Note, thread is no longer valid at this point! | |
| 1670 } | |
| 1671 | |
| 1672 | |
| 1673 void JavaThread::thread_main_inner() { | |
| 1674 assert(JavaThread::current() == this, "sanity check"); | |
| 1675 assert(this->threadObj() != NULL, "just checking"); | |
| 1676 | |
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1677 // Execute thread entry point unless this thread has a pending exception |
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1678 // or has been stopped before starting. |
| 0 | 1679 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1680 if (!this->has_pending_exception() && |
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1681 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1682 { |
| 1683 ResourceMark rm(this); | |
| 1684 this->set_native_thread_name(this->get_thread_name()); | |
| 1685 } | |
| 0 | 1686 HandleMark hm(this); |
| 1687 this->entry_point()(this, this); | |
| 1688 } | |
| 1689 | |
| 1690 DTRACE_THREAD_PROBE(stop, this); | |
| 1691 | |
| 1692 this->exit(false); | |
| 1693 delete this; | |
| 1694 } | |
| 1695 | |
| 1696 | |
| 1697 static void ensure_join(JavaThread* thread) { | |
| 1698 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1699 Handle threadObj(thread, thread->threadObj()); | |
| 1700 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1701 ObjectLocker lock(threadObj, thread); | |
| 1702 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1703 thread->clear_pending_exception(); | |
| 1704 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1705 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1706 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1707 // to complete once we've done the notify_all below |
| 0 | 1708 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1709 lock.notify_all(thread); | |
| 1710 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1711 thread->clear_pending_exception(); | |
| 1712 } | |
| 1713 | |
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1714 |
| 0 | 1715 // For any new cleanup additions, please check to see if they need to be applied to |
| 1716 // cleanup_failed_attach_current_thread as well. | |
| 1717 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1718 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1719 | |
| 1720 HandleMark hm(this); | |
| 1721 Handle uncaught_exception(this, this->pending_exception()); | |
| 1722 this->clear_pending_exception(); | |
| 1723 Handle threadObj(this, this->threadObj()); | |
| 1724 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1725 | |
| 1726 if (get_thread_profiler() != NULL) { | |
| 1727 get_thread_profiler()->disengage(); | |
| 1728 ResourceMark rm; | |
| 1729 get_thread_profiler()->print(get_thread_name()); | |
| 1730 } | |
| 1731 | |
| 1732 | |
| 1733 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1734 { | |
| 1735 EXCEPTION_MARK; | |
| 1736 | |
| 1737 CLEAR_PENDING_EXCEPTION; | |
| 1738 } | |
| 1739 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1740 // has to be fixed by a runtime query method | |
| 1741 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1742 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1743 // java.lang.Thread.dispatchUncaughtException | |
| 1744 if (uncaught_exception.not_null()) { | |
| 1745 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1746 { | |
| 1747 EXCEPTION_MARK; | |
| 1748 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1749 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1750 // so call ThreadGroup.uncaughtException() | |
| 1751 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1752 CallInfo callinfo; | |
| 1142 | 1753 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1754 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1755 vmSymbols::dispatchUncaughtException_name(), |
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1756 vmSymbols::throwable_void_signature(), |
| 0 | 1757 KlassHandle(), false, false, THREAD); |
| 1758 CLEAR_PENDING_EXCEPTION; | |
| 1759 methodHandle method = callinfo.selected_method(); | |
| 1760 if (method.not_null()) { | |
| 1761 JavaValue result(T_VOID); | |
| 1762 JavaCalls::call_virtual(&result, | |
| 1763 threadObj, thread_klass, | |
|
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1764 vmSymbols::dispatchUncaughtException_name(), |
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1765 vmSymbols::throwable_void_signature(), |
| 0 | 1766 uncaught_exception, |
| 1767 THREAD); | |
| 1768 } else { | |
| 1142 | 1769 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1770 JavaValue result(T_VOID); |
| 1771 JavaCalls::call_virtual(&result, | |
| 1772 group, thread_group, | |
|
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1773 vmSymbols::uncaughtException_name(), |
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1774 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1775 threadObj, // Arg 1 |
| 1776 uncaught_exception, // Arg 2 | |
| 1777 THREAD); | |
| 1778 } | |
|
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1779 if (HAS_PENDING_EXCEPTION) { |
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1780 ResourceMark rm(this); |
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1781 jio_fprintf(defaultStream::error_stream(), |
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1782 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1783 " in thread \"%s\"\n", |
| 6983 | 1784 pending_exception()->klass()->external_name(), |
|
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1785 get_thread_name()); |
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1786 CLEAR_PENDING_EXCEPTION; |
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1787 } |
| 0 | 1788 } |
| 1789 } | |
| 1790 | |
|
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1791 // Called before the java thread exit since we want to read info |
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1792 // from java_lang_Thread object |
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1793 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1794 EVENT_COMMIT(event, |
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1795 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1796 |
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1797 // Call after last event on thread |
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1798 EVENT_THREAD_EXIT(this); |
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1799 |
| 0 | 1800 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1801 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1802 // is deprecated anyhow. | |
| 1803 { int count = 3; | |
| 1804 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1805 EXCEPTION_MARK; | |
| 1806 JavaValue result(T_VOID); | |
| 1142 | 1807 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1808 JavaCalls::call_virtual(&result, |
| 1809 threadObj, thread_klass, | |
|
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1810 vmSymbols::exit_method_name(), |
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1811 vmSymbols::void_method_signature(), |
| 0 | 1812 THREAD); |
| 1813 CLEAR_PENDING_EXCEPTION; | |
| 1814 } | |
| 1815 } | |
| 1816 | |
| 1817 // notify JVMTI | |
| 1818 if (JvmtiExport::should_post_thread_life()) { | |
| 1819 JvmtiExport::post_thread_end(this); | |
| 1820 } | |
| 1821 | |
| 1822 // We have notified the agents that we are exiting, before we go on, | |
| 1823 // we must check for a pending external suspend request and honor it | |
| 1824 // in order to not surprise the thread that made the suspend request. | |
| 1825 while (true) { | |
| 1826 { | |
| 1827 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1828 if (!is_external_suspend()) { | |
| 1829 set_terminated(_thread_exiting); | |
| 1830 ThreadService::current_thread_exiting(this); | |
| 1831 break; | |
| 1832 } | |
| 1833 // Implied else: | |
| 1834 // Things get a little tricky here. We have a pending external | |
| 1835 // suspend request, but we are holding the SR_lock so we | |
| 1836 // can't just self-suspend. So we temporarily drop the lock | |
| 1837 // and then self-suspend. | |
| 1838 } | |
| 1839 | |
| 1840 ThreadBlockInVM tbivm(this); | |
| 1841 java_suspend_self(); | |
| 1842 | |
| 1843 // We're done with this suspend request, but we have to loop around | |
| 1844 // and check again. Eventually we will get SR_lock without a pending | |
| 1845 // external suspend request and will be able to mark ourselves as | |
| 1846 // exiting. | |
| 1847 } | |
| 1848 // no more external suspends are allowed at this point | |
| 1849 } else { | |
| 1850 // before_exit() has already posted JVMTI THREAD_END events | |
| 1851 } | |
| 1852 | |
| 1853 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1854 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1855 // group should have the destroyed bit set before waiters are notified). | |
| 1856 ensure_join(this); | |
| 1857 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1858 | |
| 1859 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1860 // held by this thread must be released. A detach operation must only | |
| 1861 // get here if there are no Java frames on the stack. Therefore, any | |
| 1862 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1863 // pre-inflated and in the monitor cache. | |
| 1864 // | |
| 1865 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1866 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1867 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1868 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1869 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1870 } | |
| 1871 | |
| 1872 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1873 // is in a consistent state, in case GC happens | |
| 1874 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1875 | |
| 1876 if (active_handles() != NULL) { | |
| 1877 JNIHandleBlock* block = active_handles(); | |
| 1878 set_active_handles(NULL); | |
| 1879 JNIHandleBlock::release_block(block); | |
| 1880 } | |
| 1881 | |
| 1882 if (free_handle_block() != NULL) { | |
| 1883 JNIHandleBlock* block = free_handle_block(); | |
| 1884 set_free_handle_block(NULL); | |
| 1885 JNIHandleBlock::release_block(block); | |
| 1886 } | |
| 1887 | |
| 1888 // These have to be removed while this is still a valid thread. | |
| 1889 remove_stack_guard_pages(); | |
| 1890 | |
| 1891 if (UseTLAB) { | |
| 1892 tlab().make_parsable(true); // retire TLAB | |
| 1893 } | |
| 1894 | |
|
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1895 if (JvmtiEnv::environments_might_exist()) { |
|
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1896 JvmtiExport::cleanup_thread(this); |
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1897 } |
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1898 |
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1899 #ifndef SERIALGC |
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1900 // We must flush G1-related buffers before removing a thread from |
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1901 // the list of active threads. |
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1902 if (UseG1GC) { |
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1903 flush_barrier_queues(); |
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1904 } |
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1905 #endif |
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1906 |
| 0 | 1907 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1908 Threads::remove(this); | |
| 1909 } | |
| 1910 | |
|
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1911 #ifndef SERIALGC |
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1912 // Flush G1-related queues. |
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1913 void JavaThread::flush_barrier_queues() { |
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1914 satb_mark_queue().flush(); |
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1915 dirty_card_queue().flush(); |
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1916 } |
|
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1917 |
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1918 void JavaThread::initialize_queues() { |
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1919 assert(!SafepointSynchronize::is_at_safepoint(), |
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1920 "we should not be at a safepoint"); |
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1921 |
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1922 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1923 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1924 // The SATB queue should have been constructed with its active |
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1925 // field set to false. |
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1926 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1927 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1928 // If we are creating the thread during a marking cycle, we should |
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1929 // set the active field of the SATB queue to true. |
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1930 if (satb_queue_set.is_active()) { |
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1931 satb_queue.set_active(true); |
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1932 } |
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1933 |
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1934 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1935 // The dirty card queue should have been constructed with its |
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1936 // active field set to true. |
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1937 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1938 } |
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1939 #endif // !SERIALGC |
|
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1940 |
| 0 | 1941 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1942 if (get_thread_profiler() != NULL) { |
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1943 get_thread_profiler()->disengage(); |
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1944 ResourceMark rm; |
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1945 get_thread_profiler()->print(get_thread_name()); |
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1946 } |
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1947 |
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1948 if (active_handles() != NULL) { |
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1949 JNIHandleBlock* block = active_handles(); |
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1950 set_active_handles(NULL); |
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1951 JNIHandleBlock::release_block(block); |
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1952 } |
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1953 |
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1954 if (free_handle_block() != NULL) { |
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1955 JNIHandleBlock* block = free_handle_block(); |
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1956 set_free_handle_block(NULL); |
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1957 JNIHandleBlock::release_block(block); |
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1958 } |
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1959 |
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1960 // These have to be removed while this is still a valid thread. |
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1961 remove_stack_guard_pages(); |
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1962 |
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1963 if (UseTLAB) { |
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1964 tlab().make_parsable(true); // retire TLAB, if any |
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1965 } |
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1966 |
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1967 #ifndef SERIALGC |
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1968 if (UseG1GC) { |
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1969 flush_barrier_queues(); |
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1970 } |
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1971 #endif |
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1972 |
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1973 Threads::remove(this); |
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1974 delete this; |
| 0 | 1975 } |
| 1976 | |
| 1977 | |
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1978 |
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1979 |
| 0 | 1980 JavaThread* JavaThread::active() { |
| 1981 Thread* thread = ThreadLocalStorage::thread(); | |
| 1982 assert(thread != NULL, "just checking"); | |
| 1983 if (thread->is_Java_thread()) { | |
| 1984 return (JavaThread*) thread; | |
| 1985 } else { | |
| 1986 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1987 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1988 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1989 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1990 return ret; | |
| 1991 } | |
| 1992 } | |
| 1993 | |
| 1994 bool JavaThread::is_lock_owned(address adr) const { | |
|
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1995 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1996 |
| 1997 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1998 if (chunk->contains(adr)) return true; | |
| 1999 } | |
| 2000 | |
| 2001 return false; | |
| 2002 } | |
| 2003 | |
| 2004 | |
| 2005 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 2006 chunk->set_next(monitor_chunks()); | |
| 2007 set_monitor_chunks(chunk); | |
| 2008 } | |
| 2009 | |
| 2010 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 2011 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 2012 if (monitor_chunks() == chunk) { | |
| 2013 set_monitor_chunks(chunk->next()); | |
| 2014 } else { | |
| 2015 MonitorChunk* prev = monitor_chunks(); | |
| 2016 while (prev->next() != chunk) prev = prev->next(); | |
| 2017 prev->set_next(chunk->next()); | |
| 2018 } | |
| 2019 } | |
| 2020 | |
| 2021 // JVM support. | |
| 2022 | |
| 2023 // Note: this function shouldn't block if it's called in | |
| 2024 // _thread_in_native_trans state (such as from | |
| 2025 // check_special_condition_for_native_trans()). | |
| 2026 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 2027 | |
| 2028 if (has_last_Java_frame() && has_async_condition()) { | |
| 2029 // If we are at a polling page safepoint (not a poll return) | |
| 2030 // then we must defer async exception because live registers | |
| 2031 // will be clobbered by the exception path. Poll return is | |
| 2032 // ok because the call we a returning from already collides | |
| 2033 // with exception handling registers and so there is no issue. | |
| 2034 // (The exception handling path kills call result registers but | |
| 2035 // this is ok since the exception kills the result anyway). | |
| 2036 | |
| 2037 if (is_at_poll_safepoint()) { | |
| 2038 // if the code we are returning to has deoptimized we must defer | |
| 2039 // the exception otherwise live registers get clobbered on the | |
| 2040 // exception path before deoptimization is able to retrieve them. | |
| 2041 // | |
| 2042 RegisterMap map(this, false); | |
| 2043 frame caller_fr = last_frame().sender(&map); | |
| 2044 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 2045 if (caller_fr.is_deoptimized_frame()) { | |
| 2046 if (TraceExceptions) { | |
| 2047 ResourceMark rm; | |
| 2048 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 2049 } | |
| 2050 return; | |
| 2051 } | |
| 2052 } | |
| 2053 } | |
| 2054 | |
| 2055 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 2056 if (condition == _no_async_condition) { | |
| 2057 // Conditions have changed since has_special_runtime_exit_condition() | |
| 2058 // was called: | |
| 2059 // - if we were here only because of an external suspend request, | |
| 2060 // then that was taken care of above (or cancelled) so we are done | |
| 2061 // - if we were here because of another async request, then it has | |
| 2062 // been cleared between the has_special_runtime_exit_condition() | |
| 2063 // and now so again we are done | |
| 2064 return; | |
| 2065 } | |
| 2066 | |
| 2067 // Check for pending async. exception | |
| 2068 if (_pending_async_exception != NULL) { | |
| 2069 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2070 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2071 |
| 2072 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2073 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2074 | |
| 2075 if (TraceExceptions) { | |
| 2076 ResourceMark rm; | |
| 2077 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2078 if (has_last_Java_frame() ) { | |
| 2079 frame f = last_frame(); | |
| 2080 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2081 } | |
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2082 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2083 } |
| 2084 _pending_async_exception = NULL; | |
| 2085 clear_has_async_exception(); | |
| 2086 } | |
| 2087 } | |
| 2088 | |
| 2089 if (check_unsafe_error && | |
| 2090 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2091 condition = _no_async_condition; // done | |
| 2092 switch (thread_state()) { | |
| 2093 case _thread_in_vm: | |
| 2094 { | |
| 2095 JavaThread* THREAD = this; | |
| 2096 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2097 } | |
| 2098 case _thread_in_native: | |
| 2099 { | |
| 2100 ThreadInVMfromNative tiv(this); | |
| 2101 JavaThread* THREAD = this; | |
| 2102 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2103 } | |
| 2104 case _thread_in_Java: | |
| 2105 { | |
| 2106 ThreadInVMfromJava tiv(this); | |
| 2107 JavaThread* THREAD = this; | |
| 2108 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2109 } | |
| 2110 default: | |
| 2111 ShouldNotReachHere(); | |
| 2112 } | |
| 2113 } | |
| 2114 | |
| 2115 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2116 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2117 "must have handled the async condition, if no exception"); | |
| 2118 } | |
| 2119 | |
| 2120 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2121 // | |
| 2122 // Check for pending external suspend. Internal suspend requests do | |
| 2123 // not use handle_special_runtime_exit_condition(). | |
| 2124 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2125 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2126 // threads could call into the VM with another thread's JNIEnv so we | |
| 2127 // can be here operating on behalf of a suspended thread (4432884). | |
| 2128 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2129 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2130 // | |
| 2131 // Because thread is external suspended the safepoint code will count | |
| 2132 // thread as at a safepoint. This can be odd because we can be here | |
| 2133 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2134 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2135 // before calling java_suspend_self like all other callers of it but | |
| 2136 // we must then observe proper safepoint protocol. (We can't leave | |
| 2137 // _thread_blocked with a safepoint in progress). However we can be | |
| 2138 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2139 // constructor/destructor pair because they assert on that type of | |
| 2140 // transition. We could do something like: | |
| 2141 // | |
| 2142 // JavaThreadState state = thread_state(); | |
| 2143 // set_thread_state(_thread_in_vm); | |
| 2144 // { | |
| 2145 // ThreadBlockInVM tbivm(this); | |
| 2146 // java_suspend_self() | |
| 2147 // } | |
| 2148 // set_thread_state(_thread_in_vm_trans); | |
| 2149 // if (safepoint) block; | |
| 2150 // set_thread_state(state); | |
| 2151 // | |
| 2152 // but that is pretty messy. Instead we just go with the way the | |
| 2153 // code has worked before and note that this is the only path to | |
| 2154 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2155 // mode. | |
| 2156 | |
| 2157 frame_anchor()->make_walkable(this); | |
| 2158 java_suspend_self(); | |
| 2159 | |
| 2160 // We might be here for reasons in addition to the self-suspend request | |
| 2161 // so check for other async requests. | |
| 2162 } | |
| 2163 | |
| 2164 if (check_asyncs) { | |
| 2165 check_and_handle_async_exceptions(); | |
| 2166 } | |
| 2167 } | |
| 2168 | |
| 2169 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2170 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2171 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2172 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2173 | |
| 2174 // Do not throw asynchronous exceptions against the compiler thread | |
| 2175 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2176 if (is_Compiler_thread()) return; | |
| 2177 | |
| 2178 { | |
| 2179 // Actually throw the Throwable against the target Thread - however | |
| 2180 // only if there is no thread death exception installed already. | |
| 1142 | 2181 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2182 // If the topmost frame is a runtime stub, then we are calling into |
| 2183 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2184 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2185 // may not be valid | |
| 2186 if (has_last_Java_frame()) { | |
| 2187 frame f = last_frame(); | |
| 2188 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2189 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2190 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2191 frame compiled_frame = f.sender(®_map); | |
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2192 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
| 0 | 2193 Deoptimization::deoptimize(this, compiled_frame, ®_map); |
| 2194 } | |
| 2195 } | |
| 2196 } | |
| 2197 | |
| 2198 // Set async. pending exception in thread. | |
| 2199 set_pending_async_exception(java_throwable); | |
| 2200 | |
| 2201 if (TraceExceptions) { | |
| 2202 ResourceMark rm; | |
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2203 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2204 } |
| 2205 // for AbortVMOnException flag | |
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2206 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2207 } |
| 2208 } | |
| 2209 | |
| 2210 | |
| 2211 // Interrupt thread so it will wake up from a potential wait() | |
| 2212 Thread::interrupt(this); | |
| 2213 } | |
| 2214 | |
| 2215 // External suspension mechanism. | |
| 2216 // | |
| 2217 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2218 // to any VM_locks and it is at a transition | |
| 2219 // Self-suspension will happen on the transition out of the vm. | |
| 2220 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2221 // | |
| 2222 // Guarantees on return: | |
| 2223 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2224 // force a safepoint) | |
| 2225 // + Target thread will not enter any new monitors | |
| 2226 // | |
| 2227 void JavaThread::java_suspend() { | |
| 2228 { MutexLocker mu(Threads_lock); | |
| 2229 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2230 return; | |
| 2231 } | |
| 2232 } | |
| 2233 | |
| 2234 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2235 if (!is_external_suspend()) { | |
| 2236 // a racing resume has cancelled us; bail out now | |
| 2237 return; | |
| 2238 } | |
| 2239 | |
| 2240 // suspend is done | |
| 2241 uint32_t debug_bits = 0; | |
| 2242 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2243 // SR_lock to allow the thread to reach a stable thread state if | |
| 2244 // it is currently in a transient thread state. | |
| 2245 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2246 SuspendRetryDelay, &debug_bits) ) { | |
| 2247 return; | |
| 2248 } | |
| 2249 } | |
| 2250 | |
| 2251 VM_ForceSafepoint vm_suspend; | |
| 2252 VMThread::execute(&vm_suspend); | |
| 2253 } | |
| 2254 | |
| 2255 // Part II of external suspension. | |
| 2256 // A JavaThread self suspends when it detects a pending external suspend | |
| 2257 // request. This is usually on transitions. It is also done in places | |
| 2258 // where continuing to the next transition would surprise the caller, | |
| 2259 // e.g., monitor entry. | |
| 2260 // | |
| 2261 // Returns the number of times that the thread self-suspended. | |
| 2262 // | |
| 2263 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2264 // thread. java_suspend_self() is the second stage of cooperative | |
| 2265 // suspension for external suspend requests and should only be used | |
| 2266 // to complete an external suspend request. | |
| 2267 // | |
| 2268 int JavaThread::java_suspend_self() { | |
| 2269 int ret = 0; | |
| 2270 | |
| 2271 // we are in the process of exiting so don't suspend | |
| 2272 if (is_exiting()) { | |
| 2273 clear_external_suspend(); | |
| 2274 return ret; | |
| 2275 } | |
| 2276 | |
| 2277 assert(_anchor.walkable() || | |
| 2278 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2279 "must have walkable stack"); | |
| 2280 | |
| 2281 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2282 | |
| 979 | 2283 assert(!this->is_ext_suspended(), |
| 0 | 2284 "a thread trying to self-suspend should not already be suspended"); |
| 2285 | |
| 2286 if (this->is_suspend_equivalent()) { | |
| 2287 // If we are self-suspending as a result of the lifting of a | |
| 2288 // suspend equivalent condition, then the suspend_equivalent | |
| 2289 // flag is not cleared until we set the ext_suspended flag so | |
| 2290 // that wait_for_ext_suspend_completion() returns consistent | |
| 2291 // results. | |
| 2292 this->clear_suspend_equivalent(); | |
| 2293 } | |
| 2294 | |
| 2295 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2296 // above. Or another external suspend request could be waiting for us | |
| 2297 // by the time we return from SR_lock()->wait(). The thread | |
| 2298 // that requested the suspension may already be trying to walk our | |
| 2299 // stack and if we return now, we can change the stack out from under | |
| 2300 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2301 // to crash. We stay self-suspended until there are no more pending | |
| 2302 // external suspend requests. | |
| 2303 while (is_external_suspend()) { | |
| 2304 ret++; | |
| 2305 this->set_ext_suspended(); | |
| 2306 | |
| 2307 // _ext_suspended flag is cleared by java_resume() | |
| 2308 while (is_ext_suspended()) { | |
| 2309 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2310 } | |
| 2311 } | |
| 2312 | |
| 2313 return ret; | |
| 2314 } | |
| 2315 | |
| 2316 #ifdef ASSERT | |
| 2317 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2318 // hence doesn't need protection from concurrent access at this stage | |
| 2319 void JavaThread::verify_not_published() { | |
| 2320 if (!Threads_lock->owned_by_self()) { | |
| 2321 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2322 assert( !Threads::includes(this), | |
| 2323 "java thread shouldn't have been published yet!"); | |
| 2324 } | |
| 2325 else { | |
| 2326 assert( !Threads::includes(this), | |
| 2327 "java thread shouldn't have been published yet!"); | |
| 2328 } | |
| 2329 } | |
| 2330 #endif | |
| 2331 | |
| 2332 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2333 // progress or when _suspend_flags is non-zero. | |
| 2334 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2335 // block if a safepoint is in progress. | |
| 2336 // Async exception ISN'T checked. | |
| 2337 // Note only the ThreadInVMfromNative transition can call this function | |
| 2338 // directly and when thread state is _thread_in_native_trans | |
| 2339 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2340 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2341 | |
| 2342 JavaThread *curJT = JavaThread::current(); | |
| 2343 bool do_self_suspend = thread->is_external_suspend(); | |
| 2344 | |
| 2345 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2346 | |
| 2347 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2348 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2349 // threads could call into the VM with another thread's JNIEnv so we | |
| 2350 // can be here operating on behalf of a suspended thread (4432884). | |
| 2351 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2352 JavaThreadState state = thread->thread_state(); | |
| 2353 | |
| 2354 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2355 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2356 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2357 thread->set_suspend_equivalent(); | |
| 2358 | |
| 2359 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2360 // wait until the thread changes to other thread state. There is no | |
| 2361 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2362 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2363 // too long. Temporarily change the state to _thread_blocked to | |
| 2364 // let the VM thread know that this thread is ready for GC. The problem | |
| 2365 // of changing thread state is that safepoint could happen just after | |
| 2366 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2367 // see the _thread_blocked state. We must check for safepoint | |
| 2368 // after restoring the state and make sure we won't leave while a safepoint | |
| 2369 // is in progress. | |
| 2370 thread->set_thread_state(_thread_blocked); | |
| 2371 thread->java_suspend_self(); | |
| 2372 thread->set_thread_state(state); | |
| 2373 // Make sure new state is seen by VM thread | |
| 2374 if (os::is_MP()) { | |
| 2375 if (UseMembar) { | |
| 2376 // Force a fence between the write above and read below | |
| 2377 OrderAccess::fence(); | |
| 2378 } else { | |
| 2379 // Must use this rather than serialization page in particular on Windows | |
| 2380 InterfaceSupport::serialize_memory(thread); | |
| 2381 } | |
| 2382 } | |
| 2383 } | |
| 2384 | |
| 2385 if (SafepointSynchronize::do_call_back()) { | |
| 2386 // If we are safepointing, then block the caller which may not be | |
| 2387 // the same as the target thread (see above). | |
| 2388 SafepointSynchronize::block(curJT); | |
| 2389 } | |
| 2390 | |
| 2391 if (thread->is_deopt_suspend()) { | |
| 2392 thread->clear_deopt_suspend(); | |
| 2393 RegisterMap map(thread, false); | |
| 2394 frame f = thread->last_frame(); | |
| 2395 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2396 f = f.sender(&map); | |
| 2397 } | |
| 2398 if (f.id() == thread->must_deopt_id()) { | |
| 2399 thread->clear_must_deopt_id(); | |
|
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2400 f.deoptimize(thread); |
| 0 | 2401 } else { |
| 2402 fatal("missed deoptimization!"); | |
| 2403 } | |
| 2404 } | |
| 2405 } | |
| 2406 | |
| 2407 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2408 // progress or when _suspend_flags is non-zero. | |
| 2409 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2410 // block if a safepoint is in progress. | |
| 2411 // Also check for pending async exception (not including unsafe access error). | |
| 2412 // Note only the native==>VM/Java barriers can call this function and when | |
| 2413 // thread state is _thread_in_native_trans. | |
| 2414 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2415 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2416 | |
| 2417 if (thread->has_async_exception()) { | |
| 2418 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2419 // access error since that may block. | |
| 2420 thread->check_and_handle_async_exceptions(false); | |
| 2421 } | |
| 2422 } | |
| 2423 | |
|
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2424 // This is a variant of the normal |
|
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2425 // check_special_condition_for_native_trans with slightly different |
|
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2426 // semantics for use by critical native wrappers. It does all the |
|
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2427 // normal checks but also performs the transition back into |
|
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2428 // thread_in_Java state. This is required so that critical natives |
|
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2429 // can potentially block and perform a GC if they are the last thread |
|
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2430 // exiting the GC_locker. |
|
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|
2431 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
|
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2432 check_special_condition_for_native_trans(thread); |
|
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|
2433 |
|
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2434 // Finish the transition |
|
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2435 thread->set_thread_state(_thread_in_Java); |
|
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2436 |
|
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|
2437 if (thread->do_critical_native_unlock()) { |
|
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2438 ThreadInVMfromJavaNoAsyncException tiv(thread); |
|
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|
2439 GC_locker::unlock_critical(thread); |
|
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2440 thread->clear_critical_native_unlock(); |
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|
2441 } |
|
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|
2442 } |
|
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|
2443 |
| 0 | 2444 // We need to guarantee the Threads_lock here, since resumes are not |
| 2445 // allowed during safepoint synchronization | |
| 2446 // Can only resume from an external suspension | |
| 2447 void JavaThread::java_resume() { | |
| 2448 assert_locked_or_safepoint(Threads_lock); | |
| 2449 | |
| 2450 // Sanity check: thread is gone, has started exiting or the thread | |
| 2451 // was not externally suspended. | |
| 2452 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2453 return; | |
| 2454 } | |
| 2455 | |
| 2456 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2457 | |
| 2458 clear_external_suspend(); | |
| 2459 | |
| 2460 if (is_ext_suspended()) { | |
| 2461 clear_ext_suspended(); | |
| 2462 SR_lock()->notify_all(); | |
| 2463 } | |
| 2464 } | |
| 2465 | |
| 2466 void JavaThread::create_stack_guard_pages() { | |
| 2467 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2468 address low_addr = stack_base() - stack_size(); | |
| 2469 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2470 | |
| 2471 int allocate = os::allocate_stack_guard_pages(); | |
| 2472 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2473 | |
|
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2474 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2475 warning("Attempt to allocate stack guard pages failed."); |
| 2476 return; | |
| 2477 } | |
| 2478 | |
| 2479 if (os::guard_memory((char *) low_addr, len)) { | |
| 2480 _stack_guard_state = stack_guard_enabled; | |
| 2481 } else { | |
| 2482 warning("Attempt to protect stack guard pages failed."); | |
| 2483 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2484 warning("Attempt to deallocate stack guard pages failed."); | |
| 2485 } | |
| 2486 } | |
| 2487 } | |
| 2488 | |
| 2489 void JavaThread::remove_stack_guard_pages() { | |
|
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|
2490 assert(Thread::current() == this, "from different thread"); |
| 0 | 2491 if (_stack_guard_state == stack_guard_unused) return; |
| 2492 address low_addr = stack_base() - stack_size(); | |
| 2493 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2494 | |
| 2495 if (os::allocate_stack_guard_pages()) { | |
|
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2496 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2497 _stack_guard_state = stack_guard_unused; |
| 2498 } else { | |
| 2499 warning("Attempt to deallocate stack guard pages failed."); | |
| 2500 } | |
| 2501 } else { | |
| 2502 if (_stack_guard_state == stack_guard_unused) return; | |
| 2503 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2504 _stack_guard_state = stack_guard_unused; | |
| 2505 } else { | |
| 2506 warning("Attempt to unprotect stack guard pages failed."); | |
| 2507 } | |
| 2508 } | |
| 2509 } | |
| 2510 | |
| 2511 void JavaThread::enable_stack_yellow_zone() { | |
| 2512 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2513 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2514 | |
| 2515 // The base notation is from the stacks point of view, growing downward. | |
| 2516 // We need to adjust it to work correctly with guard_memory() | |
| 2517 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2518 | |
| 2519 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2520 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2521 | |
| 2522 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2523 _stack_guard_state = stack_guard_enabled; | |
| 2524 } else { | |
| 2525 warning("Attempt to guard stack yellow zone failed."); | |
| 2526 } | |
| 2527 enable_register_stack_guard(); | |
| 2528 } | |
| 2529 | |
| 2530 void JavaThread::disable_stack_yellow_zone() { | |
| 2531 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2532 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2533 | |
| 2534 // Simply return if called for a thread that does not use guard pages. | |
| 2535 if (_stack_guard_state == stack_guard_unused) return; | |
| 2536 | |
| 2537 // The base notation is from the stacks point of view, growing downward. | |
| 2538 // We need to adjust it to work correctly with guard_memory() | |
| 2539 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2540 | |
| 2541 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2542 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2543 } else { | |
| 2544 warning("Attempt to unguard stack yellow zone failed."); | |
| 2545 } | |
| 2546 disable_register_stack_guard(); | |
| 2547 } | |
| 2548 | |
| 2549 void JavaThread::enable_stack_red_zone() { | |
| 2550 // The base notation is from the stacks point of view, growing downward. | |
| 2551 // We need to adjust it to work correctly with guard_memory() | |
| 2552 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2553 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2554 | |
| 2555 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2556 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2557 | |
| 2558 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2559 warning("Attempt to guard stack red zone failed."); | |
| 2560 } | |
| 2561 } | |
| 2562 | |
| 2563 void JavaThread::disable_stack_red_zone() { | |
| 2564 // The base notation is from the stacks point of view, growing downward. | |
| 2565 // We need to adjust it to work correctly with guard_memory() | |
| 2566 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2567 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2568 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2569 warning("Attempt to unguard stack red zone failed."); | |
| 2570 } | |
| 2571 } | |
| 2572 | |
| 2573 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2574 // ignore is there is no stack | |
| 2575 if (!has_last_Java_frame()) return; | |
| 2576 // traverse the stack frames. Starts from top frame. | |
| 2577 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2578 frame* fr = fst.current(); | |
| 2579 f(fr, fst.register_map()); | |
| 2580 } | |
| 2581 } | |
| 2582 | |
| 2583 | |
| 2584 #ifndef PRODUCT | |
| 2585 // Deoptimization | |
| 2586 // Function for testing deoptimization | |
| 2587 void JavaThread::deoptimize() { | |
| 2588 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2589 StackFrameStream fst(this, UseBiasedLocking); | |
| 2590 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2591 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2592 // Iterate over all frames in the thread and deoptimize | |
| 2593 for(; !fst.is_done(); fst.next()) { | |
| 2594 if(fst.current()->can_be_deoptimized()) { | |
| 2595 | |
| 2596 if (only_at) { | |
| 2597 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2598 // consists of comma or carriage return separated numbers so | |
| 2599 // search for the current bci in that string. | |
| 2600 address pc = fst.current()->pc(); | |
| 2601 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2602 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2603 char buffer[8]; | |
| 2604 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2605 size_t len = strlen(buffer); | |
| 2606 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2607 while (found != NULL) { | |
| 2608 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2609 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2610 // Check that the bci found is bracketed by terminators. | |
| 2611 break; | |
| 2612 } | |
| 2613 found = strstr(found + 1, buffer); | |
| 2614 } | |
| 2615 if (!found) { | |
| 2616 continue; | |
| 2617 } | |
| 2618 } | |
| 2619 | |
| 2620 if (DebugDeoptimization && !deopt) { | |
| 2621 deopt = true; // One-time only print before deopt | |
| 2622 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2623 trace_frames(); | |
| 2624 trace_stack(); | |
| 2625 } | |
| 2626 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2627 } | |
| 2628 } | |
| 2629 | |
| 2630 if (DebugDeoptimization && deopt) { | |
| 2631 tty->print_cr("[AFTER Deoptimization]"); | |
| 2632 trace_frames(); | |
| 2633 } | |
| 2634 } | |
| 2635 | |
| 2636 | |
| 2637 // Make zombies | |
| 2638 void JavaThread::make_zombies() { | |
| 2639 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2640 if (fst.current()->can_be_deoptimized()) { | |
| 2641 // it is a Java nmethod | |
| 2642 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2643 nm->make_not_entrant(); | |
| 2644 } | |
| 2645 } | |
| 2646 } | |
| 2647 #endif // PRODUCT | |
| 2648 | |
| 2649 | |
| 2650 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2651 if (!has_last_Java_frame()) return; | |
| 2652 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2653 StackFrameStream fst(this, UseBiasedLocking); | |
| 2654 for(; !fst.is_done(); fst.next()) { | |
| 2655 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2656 if (LogCompilation && xtty != NULL) { |
| 2657 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2658 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2659 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2660 } | |
| 2661 | |
| 0 | 2662 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2663 } | |
| 2664 } | |
| 2665 } | |
| 2666 | |
| 2667 | |
| 2668 // GC support | |
| 2669 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2670 | |
| 2671 void JavaThread::gc_epilogue() { | |
| 2672 frames_do(frame_gc_epilogue); | |
| 2673 } | |
| 2674 | |
| 2675 | |
| 2676 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2677 | |
| 2678 void JavaThread::gc_prologue() { | |
| 2679 frames_do(frame_gc_prologue); | |
| 2680 } | |
| 2681 | |
|
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2682 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2683 // the given JavaThread in its _processed_thread field. |
|
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|
2684 class RememberProcessedThread: public StackObj { |
|
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|
2685 NamedThread* _cur_thr; |
|
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|
2686 public: |
|
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|
2687 RememberProcessedThread(JavaThread* jthr) { |
|
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2688 Thread* thread = Thread::current(); |
|
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|
2689 if (thread->is_Named_thread()) { |
|
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2690 _cur_thr = (NamedThread *)thread; |
|
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2691 _cur_thr->set_processed_thread(jthr); |
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2692 } else { |
|
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|
2693 _cur_thr = NULL; |
|
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|
2694 } |
|
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|
2695 } |
|
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|
2696 |
|
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|
2697 ~RememberProcessedThread() { |
|
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|
2698 if (_cur_thr) { |
|
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|
2699 _cur_thr->set_processed_thread(NULL); |
|
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|
2700 } |
|
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|
2701 } |
|
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|
2702 }; |
| 0 | 2703 |
|
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2704 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 1166 | 2705 // Verify that the deferred card marks have been flushed. |
| 2706 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2707 |
| 0 | 2708 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2709 // since there may be more than one thread using each ThreadProfiler. | |
| 2710 | |
| 2711 // Traverse the GCHandles | |
|
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|
2712 Thread::oops_do(f, cld_f, cf); |
| 0 | 2713 |
| 2714 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2715 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2716 | |
| 2717 if (has_last_Java_frame()) { | |
|
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|
2718 // Record JavaThread to GC thread |
|
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|
2719 RememberProcessedThread rpt(this); |
| 0 | 2720 |
| 2721 // Traverse the privileged stack | |
| 2722 if (_privileged_stack_top != NULL) { | |
| 2723 _privileged_stack_top->oops_do(f); | |
| 2724 } | |
| 2725 | |
| 2726 // traverse the registered growable array | |
| 2727 if (_array_for_gc != NULL) { | |
| 2728 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2729 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2730 } | |
| 2731 } | |
| 2732 | |
| 2733 // Traverse the monitor chunks | |
| 2734 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2735 chunk->oops_do(f); | |
| 2736 } | |
| 2737 | |
| 2738 // Traverse the execution stack | |
| 2739 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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|
2740 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
| 0 | 2741 } |
| 2742 } | |
| 2743 | |
| 2744 // callee_target is never live across a gc point so NULL it here should | |
| 2745 // it still contain a methdOop. | |
| 2746 | |
| 2747 set_callee_target(NULL); | |
| 2748 | |
| 2749 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2750 // If we have deferred set_locals there might be oops waiting to be | |
| 2751 // written | |
| 2752 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2753 if (list != NULL) { | |
| 2754 for (int i = 0; i < list->length(); i++) { | |
| 2755 list->at(i)->oops_do(f); | |
| 2756 } | |
| 2757 } | |
| 2758 | |
| 2759 // Traverse instance variables at the end since the GC may be moving things | |
| 2760 // around using this function | |
| 2761 f->do_oop((oop*) &_threadObj); | |
| 2762 f->do_oop((oop*) &_vm_result); | |
| 2763 f->do_oop((oop*) &_exception_oop); | |
| 2764 f->do_oop((oop*) &_pending_async_exception); | |
| 2765 | |
| 2766 if (jvmti_thread_state() != NULL) { | |
| 2767 jvmti_thread_state()->oops_do(f); | |
| 2768 } | |
| 2769 } | |
| 2770 | |
|
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|
2771 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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|
2772 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2773 |
| 2774 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2775 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2776 | |
| 2777 if (has_last_Java_frame()) { | |
| 2778 // Traverse the execution stack | |
| 2779 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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|
2780 fst.current()->nmethods_do(cf); |
| 0 | 2781 } |
| 2782 } | |
| 2783 } | |
| 2784 | |
|
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2785 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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|
2786 Thread::metadata_do(f); |
|
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|
2787 if (has_last_Java_frame()) { |
|
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|
2788 // Traverse the execution stack to call f() on the methods in the stack |
|
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|
2789 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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|
2790 fst.current()->metadata_do(f); |
|
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|
2791 } |
|
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|
2792 } else if (is_Compiler_thread()) { |
|
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|
2793 // need to walk ciMetadata in current compile tasks to keep alive. |
|
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|
2794 CompilerThread* ct = (CompilerThread*)this; |
|
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|
2795 if (ct->env() != NULL) { |
|
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|
2796 ct->env()->metadata_do(f); |
|
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|
2797 } |
|
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|
2798 } |
|
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|
2799 } |
|
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|
2800 |
| 0 | 2801 // Printing |
| 2802 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2803 switch (_thread_state) { | |
| 2804 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2805 case _thread_new: return "_thread_new"; | |
| 2806 case _thread_new_trans: return "_thread_new_trans"; | |
| 2807 case _thread_in_native: return "_thread_in_native"; | |
| 2808 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2809 case _thread_in_vm: return "_thread_in_vm"; | |
| 2810 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2811 case _thread_in_Java: return "_thread_in_Java"; | |
| 2812 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2813 case _thread_blocked: return "_thread_blocked"; | |
| 2814 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2815 default: return "unknown thread state"; | |
| 2816 } | |
| 2817 } | |
| 2818 | |
| 2819 #ifndef PRODUCT | |
| 2820 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2821 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2822 }; | |
| 2823 void JavaThread::print_thread_state() const { | |
| 2824 print_thread_state_on(tty); | |
| 2825 }; | |
| 2826 #endif // PRODUCT | |
| 2827 | |
| 2828 // Called by Threads::print() for VM_PrintThreads operation | |
| 2829 void JavaThread::print_on(outputStream *st) const { | |
| 2830 st->print("\"%s\" ", get_thread_name()); | |
| 2831 oop thread_oop = threadObj(); | |
| 6766 | 2832 if (thread_oop != NULL) { |
| 2833 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2834 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2835 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2836 } | |
| 0 | 2837 Thread::print_on(st); |
| 2838 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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|
2839 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2840 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2841 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2842 } | |
| 2843 #ifndef PRODUCT | |
| 2844 print_thread_state_on(st); | |
| 2845 _safepoint_state->print_on(st); | |
| 2846 #endif // PRODUCT | |
| 2847 } | |
| 2848 | |
| 2849 // Called by fatal error handler. The difference between this and | |
| 2850 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2851 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2852 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2853 oop thread_obj = threadObj(); | |
| 2854 if (thread_obj != NULL) { | |
| 2855 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2856 } | |
| 2857 st->print(" ["); | |
| 2858 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2859 if (osthread()) { | |
| 2860 st->print(", id=%d", osthread()->thread_id()); | |
| 2861 } | |
| 2862 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2863 _stack_base - _stack_size, _stack_base); | |
| 2864 st->print("]"); | |
| 2865 return; | |
| 2866 } | |
| 2867 | |
| 2868 // Verification | |
| 2869 | |
| 2870 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2871 | |
| 2872 void JavaThread::verify() { | |
| 2873 // Verify oops in the thread. | |
|
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|
2874 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
| 0 | 2875 |
| 2876 // Verify the stack frames. | |
| 2877 frames_do(frame_verify); | |
| 2878 } | |
| 2879 | |
| 2880 // CR 6300358 (sub-CR 2137150) | |
| 2881 // Most callers of this method assume that it can't return NULL but a | |
| 2882 // thread may not have a name whilst it is in the process of attaching to | |
| 2883 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2884 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2885 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2886 // for such that this method never returns NULL. | |
| 2887 const char* JavaThread::get_thread_name() const { | |
| 2888 #ifdef ASSERT | |
| 2889 // early safepoints can hit while current thread does not yet have TLS | |
| 2890 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2891 Thread *cur = Thread::current(); | |
| 2892 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2893 // Current JavaThreads are allowed to get their own name without | |
| 2894 // the Threads_lock. | |
| 2895 assert_locked_or_safepoint(Threads_lock); | |
| 2896 } | |
| 2897 } | |
| 2898 #endif // ASSERT | |
| 2899 return get_thread_name_string(); | |
| 2900 } | |
| 2901 | |
| 2902 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2903 // descriptive string if there is no set name | |
| 2904 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2905 const char* name_str; | |
| 2906 oop thread_obj = threadObj(); | |
| 2907 if (thread_obj != NULL) { | |
| 2908 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2909 if (name != NULL) { | |
| 2910 if (buf == NULL) { | |
| 2911 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2912 } | |
| 2913 else { | |
| 2914 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2915 } | |
| 2916 } | |
| 4006 | 2917 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2918 name_str = "<no-name - thread is attaching>"; |
| 2919 } | |
| 2920 else { | |
| 2921 name_str = Thread::name(); | |
| 2922 } | |
| 2923 } | |
| 2924 else { | |
| 2925 name_str = Thread::name(); | |
| 2926 } | |
| 2927 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2928 return name_str; | |
| 2929 } | |
| 2930 | |
| 2931 | |
| 2932 const char* JavaThread::get_threadgroup_name() const { | |
| 2933 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2934 oop thread_obj = threadObj(); | |
| 2935 if (thread_obj != NULL) { | |
| 2936 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2937 if (thread_group != NULL) { | |
| 2938 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2939 // ThreadGroup.name can be null | |
| 2940 if (name != NULL) { | |
| 2941 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2942 return str; | |
| 2943 } | |
| 2944 } | |
| 2945 } | |
| 2946 return NULL; | |
| 2947 } | |
| 2948 | |
| 2949 const char* JavaThread::get_parent_name() const { | |
| 2950 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2951 oop thread_obj = threadObj(); | |
| 2952 if (thread_obj != NULL) { | |
| 2953 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2954 if (thread_group != NULL) { | |
| 2955 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2956 if (parent != NULL) { | |
| 2957 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2958 // ThreadGroup.name can be null | |
| 2959 if (name != NULL) { | |
| 2960 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2961 return str; | |
| 2962 } | |
| 2963 } | |
| 2964 } | |
| 2965 } | |
| 2966 return NULL; | |
| 2967 } | |
| 2968 | |
| 2969 ThreadPriority JavaThread::java_priority() const { | |
| 2970 oop thr_oop = threadObj(); | |
| 2971 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2972 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2973 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2974 return priority; | |
| 2975 } | |
| 2976 | |
| 2977 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2978 | |
| 2979 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2980 // Link Java Thread object <-> C++ Thread | |
| 2981 | |
| 2982 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2983 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2984 // be used to pass the C++ thread object to other methods. | |
| 2985 | |
| 2986 // Set the Java level thread object (jthread) field of the | |
| 2987 // new thread (a JavaThread *) to C++ thread object using the | |
| 2988 // "thread_oop" handle. | |
| 2989 | |
| 2990 // Set the thread field (a JavaThread *) of the | |
| 2991 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2992 | |
| 2993 Handle thread_oop(Thread::current(), | |
| 2994 JNIHandles::resolve_non_null(jni_thread)); | |
|
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2995 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 2996 "must be initialized"); |
| 2997 set_threadObj(thread_oop()); | |
| 2998 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2999 | |
| 3000 if (prio == NoPriority) { | |
| 3001 prio = java_lang_Thread::priority(thread_oop()); | |
| 3002 assert(prio != NoPriority, "A valid priority should be present"); | |
| 3003 } | |
| 3004 | |
| 3005 // Push the Java priority down to the native thread; needs Threads_lock | |
| 3006 Thread::set_priority(this, prio); | |
| 3007 | |
| 3008 // Add the new thread to the Threads list and set it in motion. | |
| 3009 // We must have threads lock in order to call Threads::add. | |
| 3010 // It is crucial that we do not block before the thread is | |
| 3011 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 3012 // will not be visited by GC. | |
| 3013 Threads::add(this); | |
| 3014 } | |
| 3015 | |
| 3016 oop JavaThread::current_park_blocker() { | |
| 3017 // Support for JSR-166 locks | |
| 3018 oop thread_oop = threadObj(); | |
| 242 | 3019 if (thread_oop != NULL && |
| 3020 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 3021 return java_lang_Thread::park_blocker(thread_oop); |
| 3022 } | |
| 3023 return NULL; | |
| 3024 } | |
| 3025 | |
| 3026 | |
| 3027 void JavaThread::print_stack_on(outputStream* st) { | |
| 3028 if (!has_last_Java_frame()) return; | |
| 3029 ResourceMark rm; | |
| 3030 HandleMark hm; | |
| 3031 | |
| 3032 RegisterMap reg_map(this); | |
| 3033 vframe* start_vf = last_java_vframe(®_map); | |
| 3034 int count = 0; | |
| 3035 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3036 if (f->is_java_frame()) { | |
| 3037 javaVFrame* jvf = javaVFrame::cast(f); | |
| 3038 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 3039 | |
| 3040 // Print out lock information | |
| 3041 if (JavaMonitorsInStackTrace) { | |
| 3042 jvf->print_lock_info_on(st, count); | |
| 3043 } | |
| 3044 } else { | |
| 3045 // Ignore non-Java frames | |
| 3046 } | |
| 3047 | |
| 3048 // Bail-out case for too deep stacks | |
| 3049 count++; | |
| 3050 if (MaxJavaStackTraceDepth == count) return; | |
| 3051 } | |
| 3052 } | |
| 3053 | |
| 3054 | |
| 3055 // JVMTI PopFrame support | |
| 3056 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 3057 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 3058 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 3059 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 3060 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
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|
3061 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 3062 } |
| 3063 } | |
| 3064 | |
| 3065 void* JavaThread::popframe_preserved_args() { | |
| 3066 return _popframe_preserved_args; | |
| 3067 } | |
| 3068 | |
| 3069 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3070 return in_ByteSize(_popframe_preserved_args_size); | |
| 3071 } | |
| 3072 | |
| 3073 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3074 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3075 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3076 return in_WordSize(sz / wordSize); | |
| 3077 } | |
| 3078 | |
| 3079 void JavaThread::popframe_free_preserved_args() { | |
| 3080 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3081 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3082 _popframe_preserved_args = NULL; |
| 3083 _popframe_preserved_args_size = 0; | |
| 3084 } | |
| 3085 | |
| 3086 #ifndef PRODUCT | |
| 3087 | |
| 3088 void JavaThread::trace_frames() { | |
| 3089 tty->print_cr("[Describe stack]"); | |
| 3090 int frame_no = 1; | |
| 3091 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3092 tty->print(" %d. ", frame_no++); | |
| 3093 fst.current()->print_value_on(tty,this); | |
| 3094 tty->cr(); | |
| 3095 } | |
| 3096 } | |
| 3097 | |
|
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|
3098 class PrintAndVerifyOopClosure: public OopClosure { |
|
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|
3099 protected: |
|
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|
3100 template <class T> inline void do_oop_work(T* p) { |
|
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|
3101 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3102 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3103 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3104 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3105 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3106 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3107 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3108 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3109 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3110 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3111 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3112 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3113 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3114 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3115 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3116 virtual void do_oop(oop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3117 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3118 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3119 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3120 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3121 static void oops_print(frame* f, const RegisterMap *map) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3122 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3123 f->print_value(); |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3124 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3125 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3126 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3127 // Print our all the locations that contain oops and whether they are |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3128 // valid or not. This useful when trying to find the oldest frame |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3129 // where an oop has gone bad since the frame walk is from youngest to |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3130 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3131 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3132 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3133 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3134 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3135 |
| 0 | 3136 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3137 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3138 // Print or validate the layout of stack frames |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3139 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3140 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3141 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3142 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3143 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3144 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3145 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3146 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3147 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3148 if (validate_only) { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3149 values.validate(); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3150 } else { |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3151 tty->print_cr("[Describe stack layout]"); |
|
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3152 values.print(this); |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3153 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3154 } |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3155 #endif |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3156 |
| 0 | 3157 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3158 ResourceMark rm; | |
| 3159 int vframe_no = 1; | |
| 3160 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3161 if (f->is_java_frame()) { | |
| 3162 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3163 } else { | |
| 3164 f->print(); | |
| 3165 } | |
| 3166 if (vframe_no > StackPrintLimit) { | |
| 3167 tty->print_cr("...<more frames>..."); | |
| 3168 return; | |
| 3169 } | |
| 3170 } | |
| 3171 } | |
| 3172 | |
| 3173 | |
| 3174 void JavaThread::trace_stack() { | |
| 3175 if (!has_last_Java_frame()) return; | |
| 3176 ResourceMark rm; | |
| 3177 HandleMark hm; | |
| 3178 RegisterMap reg_map(this); | |
| 3179 trace_stack_from(last_java_vframe(®_map)); | |
| 3180 } | |
| 3181 | |
| 3182 | |
| 3183 #endif // PRODUCT | |
| 3184 | |
| 3185 | |
| 3186 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3187 assert(reg_map != NULL, "a map must be given"); | |
| 3188 frame f = last_frame(); | |
| 3189 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3190 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3191 } | |
| 3192 return NULL; | |
| 3193 } | |
| 3194 | |
| 3195 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3196 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3197 vframeStream vfst(this); |
| 3198 vfst.security_get_caller_frame(depth); | |
| 3199 if (!vfst.at_end()) { | |
| 3200 return vfst.method()->method_holder(); | |
| 3201 } | |
| 3202 return NULL; | |
| 3203 } | |
| 3204 | |
| 3205 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3206 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3207 CompileBroker::compiler_thread_loop(); | |
| 3208 } | |
| 3209 | |
| 3210 // Create a CompilerThread | |
| 3211 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3212 : JavaThread(&compiler_thread_entry) { | |
| 3213 _env = NULL; | |
| 3214 _log = NULL; | |
| 3215 _task = NULL; | |
| 3216 _queue = queue; | |
| 3217 _counters = counters; | |
| 1584 | 3218 _buffer_blob = NULL; |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3219 _scanned_nmethod = NULL; |
| 0 | 3220 |
| 3221 #ifndef PRODUCT | |
| 3222 _ideal_graph_printer = NULL; | |
| 3223 #endif | |
| 3224 } | |
| 3225 | |
|
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3226 void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
|
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3227 JavaThread::oops_do(f, cld_f, cf); |
|
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3228 if (_scanned_nmethod != NULL && cf != NULL) { |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3229 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3230 // process it here to make sure it isn't unloaded in the middle of |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3231 // a scan. |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3232 cf->do_code_blob(_scanned_nmethod); |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3233 } |
|
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3234 } |
| 0 | 3235 |
| 3236 // ======= Threads ======== | |
| 3237 | |
| 3238 // The Threads class links together all active threads, and provides | |
| 3239 // operations over all threads. It is protected by its own Mutex | |
| 3240 // lock, which is also used in other contexts to protect thread | |
| 3241 // operations from having the thread being operated on from exiting | |
| 3242 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3243 | |
| 3244 JavaThread* Threads::_thread_list = NULL; | |
| 3245 int Threads::_number_of_threads = 0; | |
| 3246 int Threads::_number_of_non_daemon_threads = 0; | |
| 3247 int Threads::_return_code = 0; | |
| 3248 size_t JavaThread::_stack_size_at_create = 0; | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3249 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3250 bool Threads::_vm_complete = false; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3251 #endif |
| 0 | 3252 |
| 3253 // All JavaThreads | |
| 3254 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3255 | |
| 3256 void os_stream(); | |
| 3257 | |
| 3258 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3259 void Threads::threads_do(ThreadClosure* tc) { | |
| 3260 assert_locked_or_safepoint(Threads_lock); | |
| 3261 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3262 ALL_JAVA_THREADS(p) { | |
| 3263 tc->do_thread(p); | |
| 3264 } | |
| 3265 // Someday we could have a table or list of all non-JavaThreads. | |
| 3266 // For now, just manually iterate through them. | |
| 3267 tc->do_thread(VMThread::vm_thread()); | |
| 3268 Universe::heap()->gc_threads_do(tc); | |
|
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3269 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3270 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3271 // the data for WatcherThread is still valid upon being examined. However, |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3272 // considering that WatchThread terminates when the VM is on the way to |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3273 // exit at safepoint, the chance of the above is extremely small. The right |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3274 // way to prevent termination of WatcherThread would be to acquire |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3275 // Terminator_lock, but we can't do that without violating the lock rank |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3276 // checking in some cases. |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3277 if (wt != NULL) |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3278 tc->do_thread(wt); |
|
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3279 |
| 0 | 3280 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3281 } | |
| 3282 | |
| 3283 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3284 | |
| 242 | 3285 extern void JDK_Version_init(); |
| 3286 | |
| 0 | 3287 // Check version |
| 3288 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3289 | |
| 3290 // Initialize the output stream module | |
| 3291 ostream_init(); | |
| 3292 | |
| 3293 // Process java launcher properties. | |
| 3294 Arguments::process_sun_java_launcher_properties(args); | |
| 3295 | |
| 3296 // Initialize the os module before using TLS | |
| 3297 os::init(); | |
| 3298 | |
| 3299 // Initialize system properties. | |
| 3300 Arguments::init_system_properties(); | |
| 3301 | |
| 242 | 3302 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3303 JDK_Version_init(); | |
| 3304 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3305 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3306 Arguments::init_version_specific_system_properties(); |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3307 |
| 0 | 3308 // Parse arguments |
| 3309 jint parse_result = Arguments::parse(args); | |
| 3310 if (parse_result != JNI_OK) return parse_result; | |
| 3311 | |
| 3312 if (PauseAtStartup) { | |
| 3313 os::pause(); | |
| 3314 } | |
| 3315 | |
| 4006 | 3316 #ifndef USDT2 |
| 0 | 3317 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3318 #else /* USDT2 */ |
| 3319 HOTSPOT_VM_INIT_BEGIN(); | |
| 3320 #endif /* USDT2 */ | |
| 0 | 3321 |
| 3322 // Record VM creation timing statistics | |
| 3323 TraceVmCreationTime create_vm_timer; | |
| 3324 create_vm_timer.start(); | |
| 3325 | |
| 3326 // Timing (must come after argument parsing) | |
| 3327 TraceTime timer("Create VM", TraceStartupTime); | |
| 3328 | |
| 3329 // Initialize the os module after parsing the args | |
| 3330 jint os_init_2_result = os::init_2(); | |
| 3331 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3332 | |
|
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3333 jint adjust_after_os_result = Arguments::adjust_after_os(); |
|
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|
3334 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
|
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|
3335 |
| 6197 | 3336 // intialize TLS |
| 3337 ThreadLocalStorage::init(); | |
| 3338 | |
| 3339 // Bootstrap native memory tracking, so it can start recording memory | |
| 3340 // activities before worker thread is started. This is the first phase | |
| 3341 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3342 MemTracker::bootstrap_single_thread(); | |
| 3343 | |
| 0 | 3344 // Initialize output stream logging |
| 3345 ostream_init_log(); | |
| 3346 | |
| 3347 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3348 // Must be before create_vm_init_agents() | |
| 3349 if (Arguments::init_libraries_at_startup()) { | |
| 3350 convert_vm_init_libraries_to_agents(); | |
| 3351 } | |
| 3352 | |
| 3353 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3354 if (Arguments::init_agents_at_startup()) { | |
| 3355 create_vm_init_agents(); | |
| 3356 } | |
| 3357 | |
| 3358 // Initialize Threads state | |
| 3359 _thread_list = NULL; | |
| 3360 _number_of_threads = 0; | |
| 3361 _number_of_non_daemon_threads = 0; | |
| 3362 | |
| 3363 // Initialize global data structures and create system classes in heap | |
| 3364 vm_init_globals(); | |
| 3365 | |
| 3366 // Attach the main thread to this os thread | |
| 3367 JavaThread* main_thread = new JavaThread(); | |
| 3368 main_thread->set_thread_state(_thread_in_vm); | |
| 3369 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3370 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3371 // change the stack size recorded here to one based on the java thread | |
| 3372 // stacksize. This adjusted size is what is used to figure the placement | |
| 3373 // of the guard pages. | |
| 3374 main_thread->record_stack_base_and_size(); | |
| 3375 main_thread->initialize_thread_local_storage(); | |
| 3376 | |
| 3377 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3378 | |
| 3379 if (!main_thread->set_as_starting_thread()) { | |
| 3380 vm_shutdown_during_initialization( | |
| 3381 "Failed necessary internal allocation. Out of swap space"); | |
| 3382 delete main_thread; | |
| 3383 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3384 return JNI_ENOMEM; | |
| 3385 } | |
| 3386 | |
| 3387 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3388 // crash Linux VM, see notes in os_linux.cpp. | |
| 3389 main_thread->create_stack_guard_pages(); | |
| 3390 | |
| 1878 | 3391 // Initialize Java-Level synchronization subsystem |
| 3392 ObjectMonitor::Initialize() ; | |
| 0 | 3393 |
| 6197 | 3394 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3395 MemTracker::bootstrap_multi_thread(); | |
| 3396 | |
| 0 | 3397 // Initialize global modules |
| 3398 jint status = init_globals(); | |
| 3399 if (status != JNI_OK) { | |
| 3400 delete main_thread; | |
| 3401 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3402 return status; | |
| 3403 } | |
| 3404 | |
|
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|
3405 // Should be done after the heap is fully created |
|
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|
3406 main_thread->cache_global_variables(); |
|
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|
3407 |
| 0 | 3408 HandleMark hm; |
| 3409 | |
| 3410 { MutexLocker mu(Threads_lock); | |
| 3411 Threads::add(main_thread); | |
| 3412 } | |
| 3413 | |
| 3414 // Any JVMTI raw monitors entered in onload will transition into | |
| 3415 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3416 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3417 | |
| 3418 if (VerifyBeforeGC && | |
| 3419 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3420 Universe::heap()->prepare_for_verify(); | |
| 3421 Universe::verify(); // make sure we're starting with a clean slate | |
| 3422 } | |
| 3423 | |
| 6197 | 3424 // Fully start NMT |
| 3425 MemTracker::start(); | |
| 3426 | |
| 0 | 3427 // Create the VMThread |
| 3428 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3429 VMThread::create(); | |
| 3430 Thread* vmthread = VMThread::vm_thread(); | |
| 3431 | |
| 3432 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3433 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3434 | |
| 3435 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3436 // Monitors can have spurious returns, must always check another state flag | |
| 3437 { | |
| 3438 MutexLocker ml(Notify_lock); | |
| 3439 os::start_thread(vmthread); | |
| 3440 while (vmthread->active_handles() == NULL) { | |
| 3441 Notify_lock->wait(); | |
| 3442 } | |
| 3443 } | |
| 3444 } | |
| 3445 | |
| 3446 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3447 EXCEPTION_MARK; | |
| 3448 | |
| 3449 // At this point, the Universe is initialized, but we have not executed | |
| 3450 // any byte code. Now is a good time (the only time) to dump out the | |
| 3451 // internal state of the JVM for sharing. | |
| 3452 if (DumpSharedSpaces) { | |
|
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diff
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|
3453 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3454 ShouldNotReachHere(); |
| 3455 } | |
| 3456 | |
| 3457 // Always call even when there are not JVMTI environments yet, since environments | |
| 3458 // may be attached late and JVMTI must track phases of VM execution | |
| 3459 JvmtiExport::enter_start_phase(); | |
| 3460 | |
| 3461 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3462 JvmtiExport::post_vm_start(); | |
| 3463 | |
| 3464 { | |
| 3465 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3466 | |
| 3467 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3468 create_vm_init_libraries(); | |
| 3469 } | |
| 3470 | |
| 7608 | 3471 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3472 |
|
18
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|
3473 if (AggressiveOpts) { |
|
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|
3474 { |
|
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diff
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|
3475 // Forcibly initialize java/util/HashMap and mutate the private |
|
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diff
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|
3476 // static final "frontCacheEnabled" field before we start creating instances |
|
18
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|
3477 #ifdef ASSERT |
|
6725
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|
3478 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3479 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
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|
3480 #endif |
|
6725
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|
3481 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3482 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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|
3483 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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|
3484 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3485 ik->initialize(CHECK_0); |
|
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diff
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|
3486 fieldDescriptor fd; |
|
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diff
changeset
|
3487 // Possible we might not find this field; if so, don't break |
|
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diff
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|
3488 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
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|
3489 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
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|
3490 } |
|
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diff
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|
3491 } |
|
6d13fcb3663f
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diff
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|
3492 |
|
6d13fcb3663f
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diff
changeset
|
3493 if (UseStringCache) { |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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|
3494 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
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|
3495 // static final "stringCacheEnabled" field before we start creating instances |
|
6725
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diff
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|
3496 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
eca19a8425b5
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diff
changeset
|
3497 // Possible that StringValue isn't present: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3498 if (k_o != NULL) { |
|
eca19a8425b5
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diff
changeset
|
3499 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
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diff
changeset
|
3500 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3501 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3502 fieldDescriptor fd; |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3503 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
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diff
changeset
|
3504 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
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diff
changeset
|
3505 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
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|
3506 } |
|
192
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|
3507 } |
|
18
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|
3508 } |
|
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|
3509 } |
|
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diff
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|
3510 |
| 0 | 3511 // Initialize java_lang.System (needed before creating the thread) |
| 7608 | 3512 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
| 3513 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
| 3514 Handle thread_group = create_initial_thread_group(CHECK_0); | |
| 3515 Universe::set_main_thread_group(thread_group()); | |
| 3516 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
| 3517 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
| 3518 main_thread->set_threadObj(thread_object); | |
| 3519 // Set thread status to running since main thread has | |
| 3520 // been started and running. | |
| 3521 java_lang_Thread::set_thread_status(thread_object, | |
| 3522 java_lang_Thread::RUNNABLE); | |
| 3523 | |
| 3524 // The VM creates & returns objects of this class. Make sure it's initialized. | |
| 3525 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
| 3526 | |
| 3527 // The VM preresolves methods to these classes. Make sure that they get initialized | |
| 3528 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
| 3529 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
| 3530 call_initializeSystemClass(CHECK_0); | |
| 3531 | |
| 3532 // get the Java runtime name after java.lang.System is initialized | |
| 3533 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
| 3534 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
| 0 | 3535 |
| 3536 // an instance of OutOfMemory exception has been allocated earlier | |
| 7608 | 3537 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
| 3538 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
| 3539 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
| 3540 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
| 3541 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
| 3542 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
| 3543 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
| 3544 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
|
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|
3545 } |
| 0 | 3546 |
| 3547 // See : bugid 4211085. | |
| 3548 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3549 // property"java.compiler" and read & write property "java.vm.info". | |
| 3550 // When a security manager is installed through the command line | |
| 3551 // option "-Djava.security.manager", the above properties are not | |
| 3552 // readable and the static initializer for java.lang.Compiler fails | |
| 3553 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3554 // user code which calls methods in java.lang.Compiler. | |
| 3555 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3556 // system domains are on the stack when the properties are read. | |
| 3557 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3558 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3559 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3560 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3561 // Once that is done, we should remove this hack. | |
|
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6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
3562 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3563 |
| 3564 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3565 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3566 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3567 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3568 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3569 reset_vm_info_property(CHECK_0); | |
| 3570 | |
| 3571 quicken_jni_functions(); | |
| 3572 | |
|
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|
3573 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
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diff
changeset
|
3574 if (TRACE_INITIALIZE() != JNI_OK) { |
|
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changeset
|
3575 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
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diff
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|
3576 } |
|
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diff
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|
3577 |
| 0 | 3578 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3579 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3580 set_init_completed(); | |
| 3581 | |
| 4006 | 3582 #ifndef USDT2 |
| 0 | 3583 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3584 #else /* USDT2 */ |
| 3585 HOTSPOT_VM_INIT_END(); | |
| 3586 #endif /* USDT2 */ | |
| 0 | 3587 |
| 3588 // record VM initialization completion time | |
|
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fb19af007ffc
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diff
changeset
|
3589 #if INCLUDE_MANAGEMENT |
| 0 | 3590 Management::record_vm_init_completed(); |
|
6854
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|
3591 #endif // INCLUDE_MANAGEMENT |
| 0 | 3592 |
| 3593 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3594 // valid exceptions may be thrown in the process. | |
| 3595 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3596 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3597 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3598 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3599 if (HAS_PENDING_EXCEPTION) { | |
| 3600 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3601 } | |
| 3602 | |
| 3603 #ifndef SERIALGC | |
| 3604 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
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|
3605 // and better encapsulated. The ugly nested if test would go away |
|
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|
3606 // once things are properly refactored. XXX YSR |
|
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|
3607 if (UseConcMarkSweepGC || UseG1GC) { |
|
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|
3608 if (UseConcMarkSweepGC) { |
|
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|
3609 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
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|
3610 } else { |
|
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diff
changeset
|
3611 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
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|
3612 } |
| 0 | 3613 if (HAS_PENDING_EXCEPTION) { |
| 3614 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3615 } | |
| 3616 } | |
| 3617 #endif // SERIALGC | |
| 3618 | |
| 3619 // Always call even when there are not JVMTI environments yet, since environments | |
| 3620 // may be attached late and JVMTI must track phases of VM execution | |
| 3621 JvmtiExport::enter_live_phase(); | |
| 3622 | |
| 3623 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3624 os::signal_init(); | |
| 3625 | |
| 3626 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3627 if (!DisableAttachMechanism) { | |
| 3628 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3629 AttachListener::init(); | |
| 3630 } | |
| 3631 } | |
| 3632 | |
| 3633 // Launch -Xrun agents | |
| 3634 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3635 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3636 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3637 create_vm_init_libraries(); | |
| 3638 } | |
| 3639 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3640 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3641 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3642 |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3643 if (!TRACE_START()) { |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3644 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3645 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3646 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3647 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3648 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3649 } |
| 0 | 3650 |
| 3651 // initialize compiler(s) | |
| 7195 | 3652 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) |
| 0 | 3653 CompileBroker::compilation_init(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3654 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3655 |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3656 #if INCLUDE_MANAGEMENT |
| 0 | 3657 Management::initialize(THREAD); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3658 #endif // INCLUDE_MANAGEMENT |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3659 |
| 0 | 3660 if (HAS_PENDING_EXCEPTION) { |
| 3661 // management agent fails to start possibly due to | |
| 3662 // configuration problem and is responsible for printing | |
| 3663 // stack trace if appropriate. Simply exit VM. | |
| 3664 vm_exit(1); | |
| 3665 } | |
| 3666 | |
| 3667 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3668 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3669 if (MemProfiling) MemProfiler::engage(); | |
| 3670 StatSampler::engage(); | |
| 3671 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3672 | |
| 3673 BiasedLocking::init(); | |
| 3674 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3675 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3676 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3677 // The Java side of PostVMInitHook.run must deal with all |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3678 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3679 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3680 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3681 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3682 } |
| 0 | 3683 |
|
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3684 { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3685 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3686 // Make sure the watcher thread can be started by WatcherThread::start() |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3687 // or by dynamic enrollment. |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3688 WatcherThread::make_startable(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3689 // Start up the WatcherThread if there are any periodic tasks |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3690 // NOTE: All PeriodicTasks should be registered by now. If they |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3691 // aren't, late joiners might appear to start slowly (we might |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3692 // take a while to process their first tick). |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3693 if (PeriodicTask::num_tasks() > 0) { |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3694 WatcherThread::start(); |
|
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3695 } |
| 0 | 3696 } |
| 3697 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3698 // Give os specific code one last chance to start |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3699 os::init_3(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3700 |
| 0 | 3701 create_vm_timer.end(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3702 #ifdef ASSERT |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3703 _vm_complete = true; |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3704 #endif |
| 0 | 3705 return JNI_OK; |
| 3706 } | |
| 3707 | |
| 3708 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3709 extern "C" { | |
| 3710 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3711 } | |
| 3712 // Find a command line agent library and return its entry point for | |
| 3713 // -agentlib: -agentpath: -Xrun | |
| 3714 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3715 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3716 OnLoadEntry_t on_load_entry = NULL; | |
| 3717 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3718 | |
| 3719 if (library == NULL) { | |
| 3720 char buffer[JVM_MAXPATHLEN]; | |
| 3721 char ebuf[1024]; | |
| 3722 const char *name = agent->name(); | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3723 const char *msg = "Could not find agent library "; |
| 0 | 3724 |
| 3725 if (agent->is_absolute_path()) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3726 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3727 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3728 const char *sub_msg = " in absolute path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3729 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3730 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3731 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3732 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3733 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3734 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3735 } |
| 3736 } else { | |
| 3737 // Try to load the agent from the standard dll directory | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3738 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3739 name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3740 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3741 } |
| 0 | 3742 #ifdef KERNEL |
| 3743 // Download instrument dll | |
| 3744 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3745 char *props = Arguments::get_kernel_properties(); | |
| 3746 char *home = Arguments::get_java_home(); | |
| 3747 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3748 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3749 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
| 6197 | 3750 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
| 0 | 3751 jio_snprintf(cmd, length, fmt, home, props); |
| 3752 int status = os::fork_and_exec(cmd); | |
| 3753 FreeHeap(props); | |
| 3754 if (status == -1) { | |
| 3755 warning(cmd); | |
| 3756 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3757 strerror(errno)); | |
| 3758 } | |
| 6197 | 3759 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
| 0 | 3760 // when this comes back the instrument.dll should be where it belongs. |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3761 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3762 } |
| 3763 #endif // KERNEL | |
| 3764 if (library == NULL) { // Try the local directory | |
| 3765 char ns[1] = {0}; | |
|
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3766 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3767 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3768 } |
| 0 | 3769 if (library == NULL) { |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3770 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3771 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3772 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3773 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3774 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3775 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3776 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3777 } |
| 3778 } | |
| 3779 } | |
| 3780 agent->set_os_lib(library); | |
| 3781 } | |
| 3782 | |
| 3783 // Find the OnLoad function. | |
| 3784 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3785 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3786 if (on_load_entry != NULL) break; |
| 3787 } | |
| 3788 return on_load_entry; | |
| 3789 } | |
| 3790 | |
| 3791 // Find the JVM_OnLoad entry point | |
| 3792 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3793 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3794 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3795 } | |
| 3796 | |
| 3797 // Find the Agent_OnLoad entry point | |
| 3798 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3799 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3800 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3801 } | |
| 3802 | |
| 3803 // For backwards compatibility with -Xrun | |
| 3804 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3805 // treated like -agentpath: | |
| 3806 // Must be called before agent libraries are created | |
| 3807 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3808 AgentLibrary* agent; | |
| 3809 AgentLibrary* next; | |
| 3810 | |
| 3811 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3812 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3813 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3814 | |
| 3815 // If there is an JVM_OnLoad function it will get called later, | |
| 3816 // otherwise see if there is an Agent_OnLoad | |
| 3817 if (on_load_entry == NULL) { | |
| 3818 on_load_entry = lookup_agent_on_load(agent); | |
| 3819 if (on_load_entry != NULL) { | |
| 3820 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3821 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3822 Arguments::convert_library_to_agent(agent); | |
| 3823 } else { | |
| 3824 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3825 } | |
| 3826 } | |
| 3827 } | |
| 3828 } | |
| 3829 | |
| 3830 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3831 // Invokes Agent_OnLoad | |
| 3832 // Called very early -- before JavaThreads exist | |
| 3833 void Threads::create_vm_init_agents() { | |
| 3834 extern struct JavaVM_ main_vm; | |
| 3835 AgentLibrary* agent; | |
| 3836 | |
| 3837 JvmtiExport::enter_onload_phase(); | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3838 |
| 0 | 3839 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3840 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3841 | |
| 3842 if (on_load_entry != NULL) { | |
| 3843 // Invoke the Agent_OnLoad function | |
| 3844 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3845 if (err != JNI_OK) { | |
| 3846 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3847 } | |
| 3848 } else { | |
| 3849 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3850 } | |
| 3851 } | |
| 3852 JvmtiExport::enter_primordial_phase(); | |
| 3853 } | |
| 3854 | |
| 3855 extern "C" { | |
| 3856 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3857 } | |
| 3858 | |
| 3859 void Threads::shutdown_vm_agents() { | |
| 3860 // Send any Agent_OnUnload notifications | |
| 3861 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3862 extern struct JavaVM_ main_vm; | |
| 3863 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3864 | |
| 3865 // Find the Agent_OnUnload function. | |
| 3866 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3867 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3868 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3869 |
| 3870 // Invoke the Agent_OnUnload function | |
| 3871 if (unload_entry != NULL) { | |
| 3872 JavaThread* thread = JavaThread::current(); | |
| 3873 ThreadToNativeFromVM ttn(thread); | |
| 3874 HandleMark hm(thread); | |
| 3875 (*unload_entry)(&main_vm); | |
| 3876 break; | |
| 3877 } | |
| 3878 } | |
| 3879 } | |
| 3880 } | |
| 3881 | |
| 3882 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3883 // Invokes JVM_OnLoad | |
| 3884 void Threads::create_vm_init_libraries() { | |
| 3885 extern struct JavaVM_ main_vm; | |
| 3886 AgentLibrary* agent; | |
| 3887 | |
| 3888 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3889 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3890 | |
| 3891 if (on_load_entry != NULL) { | |
| 3892 // Invoke the JVM_OnLoad function | |
| 3893 JavaThread* thread = JavaThread::current(); | |
| 3894 ThreadToNativeFromVM ttn(thread); | |
| 3895 HandleMark hm(thread); | |
| 3896 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3897 if (err != JNI_OK) { | |
| 3898 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3899 } | |
| 3900 } else { | |
| 3901 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3902 } | |
| 3903 } | |
| 3904 } | |
| 3905 | |
| 3906 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3907 void JavaThread::invoke_shutdown_hooks() { | |
| 3908 HandleMark hm(this); | |
| 3909 | |
| 3910 // We could get here with a pending exception, if so clear it now. | |
| 3911 if (this->has_pending_exception()) { | |
| 3912 this->clear_pending_exception(); | |
| 3913 } | |
| 3914 | |
| 3915 EXCEPTION_MARK; | |
|
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3916 Klass* k = |
|
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|
3917 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3918 THREAD); |
| 3919 if (k != NULL) { | |
| 3920 // SystemDictionary::resolve_or_null will return null if there was | |
| 3921 // an exception. If we cannot load the Shutdown class, just don't | |
| 3922 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3923 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3924 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3925 // was called, the Shutdown class would have already been loaded | |
| 3926 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3927 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3928 JavaValue result(T_VOID); | |
| 3929 JavaCalls::call_static(&result, | |
| 3930 shutdown_klass, | |
|
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|
3931 vmSymbols::shutdown_method_name(), |
|
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|
3932 vmSymbols::void_method_signature(), |
| 0 | 3933 THREAD); |
| 3934 } | |
| 3935 CLEAR_PENDING_EXCEPTION; | |
| 3936 } | |
| 3937 | |
| 3938 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3939 // the program falls off the end of main(). Another VM exit path is through | |
| 3940 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3941 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3942 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3943 // and VM_Exit op at VM level. | |
| 3944 // | |
| 3945 // Shutdown sequence: | |
| 6197 | 3946 // + Shutdown native memory tracking if it is on |
| 0 | 3947 // + Wait until we are the last non-daemon thread to execute |
| 3948 // <-- every thing is still working at this moment --> | |
| 3949 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3950 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3951 // + Call before_exit(), prepare for VM exit | |
| 3952 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3953 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3954 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3955 // post thread end and vm death events to JVMTI, | |
| 3956 // stop signal thread | |
| 3957 // + Call JavaThread::exit(), it will: | |
| 3958 // > release JNI handle blocks, remove stack guard pages | |
| 3959 // > remove this thread from Threads list | |
| 3960 // <-- no more Java code from this thread after this point --> | |
| 3961 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3962 // the compiler threads at safepoint | |
| 3963 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3964 // + Disable tracing at JNI/JVM barriers | |
| 3965 // + Set _vm_exited flag for threads that are still running native code | |
| 3966 // + Delete this thread | |
| 3967 // + Call exit_globals() | |
| 3968 // > deletes tty | |
| 3969 // > deletes PerfMemory resources | |
| 3970 // + Return to caller | |
| 3971 | |
| 3972 bool Threads::destroy_vm() { | |
| 3973 JavaThread* thread = JavaThread::current(); | |
| 3974 | |
|
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3975 #ifdef ASSERT |
|
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3976 _vm_complete = false; |
|
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|
3977 #endif |
| 0 | 3978 // Wait until we are the last non-daemon thread to execute |
| 3979 { MutexLocker nu(Threads_lock); | |
| 3980 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3981 // This wait should make safepoint checks, wait without a timeout, | |
| 3982 // and wait as a suspend-equivalent condition. | |
| 3983 // | |
| 3984 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3985 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3986 // is waiting for the external suspend request on this thread to | |
| 3987 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3988 // timeout, but that takes time. Making this wait a suspend- | |
| 3989 // equivalent condition solves that timeout problem. | |
| 3990 // | |
| 3991 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3992 Mutex::_as_suspend_equivalent_flag); | |
| 3993 } | |
| 3994 | |
| 6197 | 3995 // Shutdown NMT before exit. Otherwise, |
| 3996 // it will run into trouble when system destroys static variables. | |
| 3997 MemTracker::shutdown(MemTracker::NMT_normal); | |
| 3998 | |
| 0 | 3999 // Hang forever on exit if we are reporting an error. |
| 4000 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 4001 os::infinite_sleep(); | |
| 4002 } | |
|
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|
4003 os::wait_for_keypress_at_exit(); |
| 0 | 4004 |
| 4005 if (JDK_Version::is_jdk12x_version()) { | |
| 4006 // We are the last thread running, so check if finalizers should be run. | |
| 4007 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 4008 HandleMark rm(thread); | |
| 4009 Universe::run_finalizers_on_exit(); | |
| 4010 } else { | |
| 4011 // run Java level shutdown hooks | |
| 4012 thread->invoke_shutdown_hooks(); | |
| 4013 } | |
| 4014 | |
| 4015 before_exit(thread); | |
| 4016 | |
| 4017 thread->exit(true); | |
| 4018 | |
| 4019 // Stop VM thread. | |
| 4020 { | |
| 4021 // 4945125 The vm thread comes to a safepoint during exit. | |
| 4022 // GC vm_operations can get caught at the safepoint, and the | |
| 4023 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 4024 // to prevent this. The GC vm_operations will not be able to | |
| 4025 // queue until after the vm thread is dead. | |
|
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|
4026 // After this point, we'll never emerge out of the safepoint before |
|
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|
4027 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
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|
4028 // stopped; they remain inactive until the process exits. |
|
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|
4029 // Note: some concurrent G1 threads may be running during a safepoint, |
|
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|
4030 // but these will not be accessing the heap, just some G1-specific side |
|
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|
4031 // data structures that are not accessed by any other threads but them |
|
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|
4032 // after this point in a terminal safepoint. |
|
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|
4033 |
| 0 | 4034 MutexLocker ml(Heap_lock); |
| 4035 | |
| 4036 VMThread::wait_for_vm_thread_exit(); | |
| 4037 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 4038 VMThread::destroy(); | |
| 4039 } | |
| 4040 | |
| 4041 // clean up ideal graph printers | |
| 4042 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 4043 IdealGraphPrinter::clean_up(); | |
| 4044 #endif | |
| 4045 | |
| 4046 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 4047 // running Java code or in VM are stopped by the Safepoint. However, | |
| 4048 // daemon threads executing native code are still running. But they | |
| 4049 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 4050 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 4051 | |
| 4052 #ifndef PRODUCT | |
| 4053 // disable function tracing at JNI/JVM barriers | |
| 4054 TraceJNICalls = false; | |
| 4055 TraceJVMCalls = false; | |
| 4056 TraceRuntimeCalls = false; | |
| 4057 #endif | |
| 4058 | |
| 4059 VM_Exit::set_vm_exited(); | |
| 4060 | |
| 4061 notify_vm_shutdown(); | |
| 4062 | |
| 4063 delete thread; | |
| 4064 | |
| 4065 // exit_globals() will delete tty | |
| 4066 exit_globals(); | |
| 4067 | |
| 4068 return true; | |
| 4069 } | |
| 4070 | |
| 4071 | |
| 4072 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4073 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4074 return is_supported_jni_version(version); | |
| 4075 } | |
| 4076 | |
| 4077 | |
| 4078 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4079 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4080 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4081 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 4082 return JNI_FALSE; | |
| 4083 } | |
| 4084 | |
| 4085 | |
| 4086 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4087 // The threads lock must be owned at this point | |
| 4088 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4089 |
|
6e0aac35bfa9
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|
4090 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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|
4091 // why it is called here. |
|
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|
4092 p->initialize_queues(); |
| 0 | 4093 p->set_next(_thread_list); |
| 4094 _thread_list = p; | |
| 4095 _number_of_threads++; | |
| 4096 oop threadObj = p->threadObj(); | |
| 4097 bool daemon = true; | |
| 4098 // Bootstrapping problem: threadObj can be null for initial | |
| 4099 // JavaThread (or for threads attached via JNI) | |
| 4100 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4101 _number_of_non_daemon_threads++; | |
| 4102 daemon = false; | |
| 4103 } | |
| 4104 | |
| 6197 | 4105 p->set_safepoint_visible(true); |
| 4106 | |
| 0 | 4107 ThreadService::add_thread(p, daemon); |
| 4108 | |
| 4109 // Possible GC point. | |
|
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|
4110 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4111 } |
| 4112 | |
| 4113 void Threads::remove(JavaThread* p) { | |
| 4114 // Extra scope needed for Thread_lock, so we can check | |
| 4115 // that we do not remove thread without safepoint code notice | |
| 4116 { MutexLocker ml(Threads_lock); | |
| 4117 | |
| 4118 assert(includes(p), "p must be present"); | |
| 4119 | |
| 4120 JavaThread* current = _thread_list; | |
| 4121 JavaThread* prev = NULL; | |
| 4122 | |
| 4123 while (current != p) { | |
| 4124 prev = current; | |
| 4125 current = current->next(); | |
| 4126 } | |
| 4127 | |
| 4128 if (prev) { | |
| 4129 prev->set_next(current->next()); | |
| 4130 } else { | |
| 4131 _thread_list = p->next(); | |
| 4132 } | |
| 4133 _number_of_threads--; | |
| 4134 oop threadObj = p->threadObj(); | |
| 4135 bool daemon = true; | |
| 4136 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4137 _number_of_non_daemon_threads--; | |
| 4138 daemon = false; | |
| 4139 | |
| 4140 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4141 // on destroy_vm will wake up. | |
| 4142 if (number_of_non_daemon_threads() == 1) | |
| 4143 Threads_lock->notify_all(); | |
| 4144 } | |
| 4145 ThreadService::remove_thread(p, daemon); | |
| 4146 | |
| 4147 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4148 // the thread might mess around with locks after this point. This can cause it | |
| 4149 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4150 // of this thread since it is removed from the queue. | |
| 4151 p->set_terminated_value(); | |
| 6197 | 4152 |
| 4153 // Now, this thread is not visible to safepoint | |
| 4154 p->set_safepoint_visible(false); | |
|
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|
4155 // once the thread becomes safepoint invisible, we can not use its per-thread |
|
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|
4156 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
|
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|
4157 // to release its per-thread recorder here. |
|
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|
4158 MemTracker::thread_exiting(p); |
| 0 | 4159 } // unlock Threads_lock |
| 4160 | |
| 4161 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4162 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4163 } |
| 4164 | |
| 4165 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4166 bool Threads::includes(JavaThread* p) { | |
| 4167 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4168 ALL_JAVA_THREADS(q) { | |
| 4169 if (q == p ) { | |
| 4170 return true; | |
| 4171 } | |
| 4172 } | |
| 4173 return false; | |
| 4174 } | |
| 4175 | |
| 4176 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4177 // but the garbage collector must provide a safe context for them to run. | |
| 4178 // In particular, these things should never be called when the Threads_lock | |
| 4179 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4180 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4181 // all threads gets blocked when exiting or starting). | |
| 4182 | |
|
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|
4183 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4184 ALL_JAVA_THREADS(p) { |
|
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|
4185 p->oops_do(f, cld_f, cf); |
| 0 | 4186 } |
|
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|
4187 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
| 0 | 4188 } |
| 4189 | |
|
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|
4190 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
| 0 | 4191 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4192 // root groups. Overhead should be small enough to use all the time, | |
| 4193 // even in sequential code. | |
| 4194 SharedHeap* sh = SharedHeap::heap(); | |
|
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|
4195 // Cannot yet substitute active_workers for n_par_threads |
|
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|
4196 // because of G1CollectedHeap::verify() use of |
|
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|
4197 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
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|
4198 // turn off parallelism in process_strong_roots while active_workers |
|
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|
4199 // is being used for parallelism elsewhere. |
|
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|
4200 bool is_par = sh->n_par_threads() > 0; |
|
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|
4201 assert(!is_par || |
|
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|
4202 (SharedHeap::heap()->n_par_threads() == |
|
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|
4203 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4204 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4205 ALL_JAVA_THREADS(p) { | |
| 4206 if (p->claim_oops_do(is_par, cp)) { | |
|
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|
4207 p->oops_do(f, cld_f, cf); |
| 0 | 4208 } |
| 4209 } | |
| 4210 VMThread* vmt = VMThread::vm_thread(); | |
|
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|
4211 if (vmt->claim_oops_do(is_par, cp)) { |
|
7179
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|
4212 vmt->oops_do(f, cld_f, cf); |
|
3979
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|
4213 } |
| 0 | 4214 } |
| 4215 | |
| 4216 #ifndef SERIALGC | |
| 4217 // Used by ParallelScavenge | |
| 4218 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4219 ALL_JAVA_THREADS(p) { | |
| 4220 q->enqueue(new ThreadRootsTask(p)); | |
| 4221 } | |
| 4222 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4223 } | |
| 4224 | |
| 4225 // Used by Parallel Old | |
| 4226 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4227 ALL_JAVA_THREADS(p) { | |
| 4228 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4229 } | |
| 4230 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4231 } | |
| 4232 #endif // SERIALGC | |
| 4233 | |
|
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844
diff
changeset
|
4234 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4235 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
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|
4236 p->nmethods_do(cf); |
| 0 | 4237 } |
|
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|
4238 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4239 } |
| 4240 | |
|
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4241 void Threads::metadata_do(void f(Metadata*)) { |
|
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|
4242 ALL_JAVA_THREADS(p) { |
|
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|
4243 p->metadata_do(f); |
|
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|
4244 } |
|
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|
4245 } |
|
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|
4246 |
| 0 | 4247 void Threads::gc_epilogue() { |
| 4248 ALL_JAVA_THREADS(p) { | |
| 4249 p->gc_epilogue(); | |
| 4250 } | |
| 4251 } | |
| 4252 | |
| 4253 void Threads::gc_prologue() { | |
| 4254 ALL_JAVA_THREADS(p) { | |
| 4255 p->gc_prologue(); | |
| 4256 } | |
| 4257 } | |
| 4258 | |
| 4259 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4260 ALL_JAVA_THREADS(p) { | |
| 4261 p->deoptimized_wrt_marked_nmethods(); | |
| 4262 } | |
| 4263 } | |
| 4264 | |
| 4265 | |
| 4266 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4267 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4268 address monitor, bool doLock) { | |
| 4269 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4270 "must grab Threads_lock or be at safepoint"); | |
| 4271 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4272 | |
| 4273 int i = 0; | |
| 4274 { | |
| 4275 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4276 ALL_JAVA_THREADS(p) { | |
| 4277 if (p->is_Compiler_thread()) continue; | |
| 4278 | |
| 4279 address pending = (address)p->current_pending_monitor(); | |
| 4280 if (pending == monitor) { // found a match | |
| 4281 if (i < count) result->append(p); // save the first count matches | |
| 4282 i++; | |
| 4283 } | |
| 4284 } | |
| 4285 } | |
| 4286 return result; | |
| 4287 } | |
| 4288 | |
| 4289 | |
| 4290 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4291 assert(doLock || | |
| 4292 Threads_lock->owned_by_self() || | |
| 4293 SafepointSynchronize::is_at_safepoint(), | |
| 4294 "must grab Threads_lock or be at safepoint"); | |
| 4295 | |
| 4296 // NULL owner means not locked so we can skip the search | |
| 4297 if (owner == NULL) return NULL; | |
| 4298 | |
| 4299 { | |
| 4300 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4301 ALL_JAVA_THREADS(p) { | |
| 4302 // first, see if owner is the address of a Java thread | |
| 4303 if (owner == (address)p) return p; | |
| 4304 } | |
| 4305 } | |
| 4306 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4307 if (UseHeavyMonitors) return NULL; | |
| 4308 | |
| 4309 // | |
| 4310 // If we didn't find a matching Java thread and we didn't force use of | |
| 4311 // heavyweight monitors, then the owner is the stack address of the | |
| 4312 // Lock Word in the owning Java thread's stack. | |
| 4313 // | |
| 4314 JavaThread* the_owner = NULL; | |
| 4315 { | |
| 4316 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4317 ALL_JAVA_THREADS(q) { | |
|
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diff
changeset
|
4318 if (q->is_lock_owned(owner)) { |
| 0 | 4319 the_owner = q; |
|
702
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|
4320 break; |
| 0 | 4321 } |
| 4322 } | |
| 4323 } | |
| 4324 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4325 return the_owner; | |
| 4326 } | |
| 4327 | |
| 4328 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4329 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4330 char buf[32]; | |
| 4331 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4332 | |
| 4333 st->print_cr("Full thread dump %s (%s %s):", | |
| 4334 Abstract_VM_Version::vm_name(), | |
| 4335 Abstract_VM_Version::vm_release(), | |
| 4336 Abstract_VM_Version::vm_info_string() | |
| 4337 ); | |
| 4338 st->cr(); | |
| 4339 | |
| 4340 #ifndef SERIALGC | |
| 4341 // Dump concurrent locks | |
| 4342 ConcurrentLocksDump concurrent_locks; | |
| 4343 if (print_concurrent_locks) { | |
| 4344 concurrent_locks.dump_at_safepoint(); | |
| 4345 } | |
| 4346 #endif // SERIALGC | |
| 4347 | |
| 4348 ALL_JAVA_THREADS(p) { | |
| 4349 ResourceMark rm; | |
| 4350 p->print_on(st); | |
| 4351 if (print_stacks) { | |
| 4352 if (internal_format) { | |
| 4353 p->trace_stack(); | |
| 4354 } else { | |
| 4355 p->print_stack_on(st); | |
| 4356 } | |
| 4357 } | |
| 4358 st->cr(); | |
| 4359 #ifndef SERIALGC | |
| 4360 if (print_concurrent_locks) { | |
| 4361 concurrent_locks.print_locks_on(p, st); | |
| 4362 } | |
| 4363 #endif // SERIALGC | |
| 4364 } | |
| 4365 | |
| 4366 VMThread::vm_thread()->print_on(st); | |
| 4367 st->cr(); | |
| 4368 Universe::heap()->print_gc_threads_on(st); | |
| 4369 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4370 if (wt != NULL) { |
| 4371 wt->print_on(st); | |
| 4372 st->cr(); | |
| 4373 } | |
| 0 | 4374 CompileBroker::print_compiler_threads_on(st); |
| 4375 st->flush(); | |
| 4376 } | |
| 4377 | |
| 4378 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4379 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4380 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4381 // memory (even in resource area), it might deadlock the error handler. | |
| 4382 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4383 bool found_current = false; | |
| 4384 st->print_cr("Java Threads: ( => current thread )"); | |
| 4385 ALL_JAVA_THREADS(thread) { | |
| 4386 bool is_current = (current == thread); | |
| 4387 found_current = found_current || is_current; | |
| 4388 | |
| 4389 st->print("%s", is_current ? "=>" : " "); | |
| 4390 | |
| 4391 st->print(PTR_FORMAT, thread); | |
| 4392 st->print(" "); | |
| 4393 thread->print_on_error(st, buf, buflen); | |
| 4394 st->cr(); | |
| 4395 } | |
| 4396 st->cr(); | |
| 4397 | |
| 4398 st->print_cr("Other Threads:"); | |
| 4399 if (VMThread::vm_thread()) { | |
| 4400 bool is_current = (current == VMThread::vm_thread()); | |
| 4401 found_current = found_current || is_current; | |
| 4402 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4403 | |
| 4404 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4405 st->print(" "); | |
| 4406 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4407 st->cr(); | |
| 4408 } | |
| 4409 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4410 if (wt != NULL) { | |
| 4411 bool is_current = (current == wt); | |
| 4412 found_current = found_current || is_current; | |
| 4413 st->print("%s", is_current ? "=>" : " "); | |
| 4414 | |
| 4415 st->print(PTR_FORMAT, wt); | |
| 4416 st->print(" "); | |
| 4417 wt->print_on_error(st, buf, buflen); | |
| 4418 st->cr(); | |
| 4419 } | |
| 4420 if (!found_current) { | |
| 4421 st->cr(); | |
| 4422 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4423 current->print_on_error(st, buf, buflen); | |
| 4424 st->cr(); | |
| 4425 } | |
| 4426 } | |
| 4427 | |
| 1878 | 4428 // Internal SpinLock and Mutex |
| 4429 // Based on ParkEvent | |
| 4430 | |
| 4431 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4432 // |
| 1878 | 4433 // We employ SpinLocks _only for low-contention, fixed-length |
| 4434 // short-duration critical sections where we're concerned | |
| 4435 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4436 // The mux construct provides a spin-then-block mutual exclusion | |
| 4437 // mechanism. | |
| 4438 // | |
| 4439 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4440 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4441 // for the JVM to devolve to yielding with little progress. This is true | |
| 4442 // despite the fact that the critical sections protected by ListLock are | |
| 4443 // extremely short. | |
| 0 | 4444 // |
| 1878 | 4445 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4446 // We should make this a 1st-class type, integrated into the lock | |
| 4447 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4448 // should have sufficient padding to avoid false-sharing and excessive | |
| 4449 // cache-coherency traffic. | |
| 4450 | |
| 4451 | |
| 4452 typedef volatile int SpinLockT ; | |
| 4453 | |
| 4454 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4455 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4456 return ; // normal fast-path return | |
| 4457 } | |
| 4458 | |
| 4459 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4460 TEVENT (SpinAcquire - ctx) ; | |
| 4461 int ctr = 0 ; | |
| 4462 int Yields = 0 ; | |
| 0 | 4463 for (;;) { |
| 1878 | 4464 while (*adr != 0) { |
| 4465 ++ctr ; | |
| 4466 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4467 if (Yields > 5) { | |
| 4468 // Consider using a simple NakedSleep() instead. | |
| 4469 // Then SpinAcquire could be called by non-JVM threads | |
| 4470 Thread::current()->_ParkEvent->park(1) ; | |
| 4471 } else { | |
| 4472 os::NakedYield() ; | |
| 4473 ++Yields ; | |
| 4474 } | |
| 4475 } else { | |
| 4476 SpinPause() ; | |
| 0 | 4477 } |
| 1878 | 4478 } |
| 4479 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4480 } |
| 4481 } | |
| 4482 | |
| 1878 | 4483 void Thread::SpinRelease (volatile int * adr) { |
| 4484 assert (*adr != 0, "invariant") ; | |
| 4485 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4486 // Roach-motel semantics. | |
| 4487 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4488 // but prior LDs and STs within the critical section can't be allowed | |
| 4489 // to reorder or float past the ST that releases the lock. | |
| 4490 *adr = 0 ; | |
| 0 | 4491 } |
| 4492 | |
| 1878 | 4493 // muxAcquire and muxRelease: |
| 4494 // | |
| 4495 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4496 // The LSB of the word is set IFF the lock is held. | |
| 4497 // The remainder of the word points to the head of a singly-linked list | |
| 4498 // of threads blocked on the lock. | |
| 4499 // | |
| 4500 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4501 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4502 // minimizing the peak number of extant ParkEvent instances then | |
| 4503 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4504 // as certain invariants were satisfied. Specifically, care would need | |
| 4505 // to be taken with regards to consuming unpark() "permits". | |
| 4506 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4507 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4508 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4509 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4510 // One way around this would be to widen the restricted-range semaphore | |
| 4511 // implemented in park(). Another alternative would be to provide | |
| 4512 // multiple instances of the PlatformEvent() for each thread. One | |
| 4513 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4514 // | |
| 4515 // * Usage: | |
| 4516 // -- Only as leaf locks | |
| 4517 // -- for short-term locking only as muxAcquire does not perform | |
| 4518 // thread state transitions. | |
| 4519 // | |
| 4520 // Alternatives: | |
| 4521 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4522 // but with parking or spin-then-park instead of pure spinning. | |
| 4523 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4524 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4525 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4526 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4527 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4528 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4529 // boundaries by using placement-new. | |
| 4530 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4531 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4532 // The validity of the backlinks must be ratified before we trust the value. | |
| 4533 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4534 // the forward links, which are always trustworthy. | |
| 4535 // * Add a successor indication. The LockWord is currently encoded as | |
| 4536 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4537 // to provide the usual futile-wakeup optimization. | |
| 4538 // See RTStt for details. | |
| 4539 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4540 // | |
| 4541 | |
| 4542 | |
| 4543 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4544 enum MuxBits { LOCKBIT = 1 } ; | |
| 4545 | |
| 4546 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4547 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4548 if (w == 0) return ; | |
| 4549 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4550 return ; | |
| 4551 } | |
| 4552 | |
| 4553 TEVENT (muxAcquire - Contention) ; | |
| 4554 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4555 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4556 for (;;) { |
| 1878 | 4557 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4558 | |
| 4559 // Optional spin phase: spin-then-park strategy | |
| 4560 while (--its >= 0) { | |
| 4561 w = *Lock ; | |
| 4562 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4563 return ; | |
| 4564 } | |
| 4565 } | |
| 4566 | |
| 4567 Self->reset() ; | |
| 4568 Self->OnList = intptr_t(Lock) ; | |
| 4569 // The following fence() isn't _strictly necessary as the subsequent | |
| 4570 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4571 OrderAccess::fence(); | |
| 4572 for (;;) { | |
| 4573 w = *Lock ; | |
| 4574 if ((w & LOCKBIT) == 0) { | |
| 4575 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4576 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4577 return ; | |
| 4578 } | |
| 4579 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4580 } |
| 1878 | 4581 assert (w & LOCKBIT, "invariant") ; |
| 4582 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4583 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4584 } | |
| 4585 | |
| 4586 while (Self->OnList != 0) { | |
| 4587 Self->park() ; | |
| 4588 } | |
| 0 | 4589 } |
| 4590 } | |
| 4591 | |
| 1878 | 4592 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4593 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4594 if (w == 0) return ; | |
| 4595 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4596 return ; | |
| 4597 } | |
| 4598 | |
| 4599 TEVENT (muxAcquire - Contention) ; | |
| 4600 ParkEvent * ReleaseAfter = NULL ; | |
| 4601 if (ev == NULL) { | |
| 4602 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4603 } | |
| 4604 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4605 for (;;) { | |
| 4606 guarantee (ev->OnList == 0, "invariant") ; | |
| 4607 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4608 | |
| 4609 // Optional spin phase: spin-then-park strategy | |
| 4610 while (--its >= 0) { | |
| 4611 w = *Lock ; | |
| 4612 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4613 if (ReleaseAfter != NULL) { | |
| 4614 ParkEvent::Release (ReleaseAfter) ; | |
| 4615 } | |
| 4616 return ; | |
| 4617 } | |
| 4618 } | |
| 4619 | |
| 4620 ev->reset() ; | |
| 4621 ev->OnList = intptr_t(Lock) ; | |
| 4622 // The following fence() isn't _strictly necessary as the subsequent | |
| 4623 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4624 OrderAccess::fence(); | |
| 4625 for (;;) { | |
| 4626 w = *Lock ; | |
| 4627 if ((w & LOCKBIT) == 0) { | |
| 4628 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4629 ev->OnList = 0 ; | |
| 4630 // We call ::Release while holding the outer lock, thus | |
| 4631 // artificially lengthening the critical section. | |
| 4632 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4633 // after we've dropped the outer lock. | |
| 4634 if (ReleaseAfter != NULL) { | |
| 4635 ParkEvent::Release (ReleaseAfter) ; | |
| 4636 } | |
| 4637 return ; | |
| 4638 } | |
| 4639 continue ; // Interference -- *Lock changed -- Just retry | |
| 4640 } | |
| 4641 assert (w & LOCKBIT, "invariant") ; | |
| 4642 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4643 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4644 } | |
| 4645 | |
| 4646 while (ev->OnList != 0) { | |
| 4647 ev->park() ; | |
| 4648 } | |
| 4649 } | |
| 4650 } | |
| 4651 | |
| 4652 // Release() must extract a successor from the list and then wake that thread. | |
| 4653 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4654 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4655 // Release() would : | |
| 4656 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4657 // (B) Extract a successor from the private list "in-hand" | |
| 4658 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4659 // If there were any newly arrived threads and the CAS() would fail. | |
| 4660 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4661 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4662 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4663 // The wakee would be responsible for reattaching and remerging before it | |
| 4664 // competed for the lock. | |
| 4665 // | |
| 4666 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4667 // multiple concurrent pushers, but only one popper or detacher. | |
| 4668 // This implementation pops from the head of the list. This is unfair, | |
| 4669 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4670 // (We wake recently run threads first). | |
| 4671 | |
| 4672 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4673 for (;;) { | |
| 4674 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4675 assert (w & LOCKBIT, "invariant") ; | |
| 4676 if (w == LOCKBIT) return ; | |
| 4677 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4678 assert (List != NULL, "invariant") ; | |
| 4679 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4680 ParkEvent * nxt = List->ListNext ; | |
| 4681 | |
| 4682 // The following CAS() releases the lock and pops the head element. | |
| 4683 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4684 continue ; | |
| 4685 } | |
| 4686 List->OnList = 0 ; | |
| 4687 OrderAccess::fence() ; | |
| 4688 List->unpark () ; | |
| 4689 return ; | |
| 4690 } | |
| 4691 } | |
| 4692 | |
| 4693 | |
| 0 | 4694 void Threads::verify() { |
| 4695 ALL_JAVA_THREADS(p) { | |
| 4696 p->verify(); | |
| 4697 } | |
| 4698 VMThread* thread = VMThread::vm_thread(); | |
| 4699 if (thread != NULL) thread->verify(); | |
| 4700 } |