Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 6966:6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
Summary: dll_dir can contain multiple paths, need to parse them correctly when loading agents
Reviewed-by: dholmes, dlong
Contributed-by: bill.pittore@oracle.com
| author | bpittore |
|---|---|
| date | Wed, 07 Nov 2012 17:53:02 -0500 |
| parents | a1b8cf9cf970 |
| children | d9a84e246cce |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
| 1972 | 38 #include "memory/oopFactory.hpp" |
| 39 #include "memory/universe.inline.hpp" | |
| 40 #include "oops/instanceKlass.hpp" | |
| 41 #include "oops/objArrayOop.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
| 1972 | 44 #include "prims/jvm_misc.hpp" |
| 45 #include "prims/jvmtiExport.hpp" | |
| 46 #include "prims/jvmtiThreadState.hpp" | |
| 47 #include "prims/privilegedStack.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/arguments.hpp" | |
| 50 #include "runtime/biasedLocking.hpp" | |
| 51 #include "runtime/deoptimization.hpp" | |
| 52 #include "runtime/fprofiler.hpp" | |
| 53 #include "runtime/frame.inline.hpp" | |
| 54 #include "runtime/init.hpp" | |
| 55 #include "runtime/interfaceSupport.hpp" | |
| 56 #include "runtime/java.hpp" | |
| 57 #include "runtime/javaCalls.hpp" | |
| 58 #include "runtime/jniPeriodicChecker.hpp" | |
| 59 #include "runtime/memprofiler.hpp" | |
| 60 #include "runtime/mutexLocker.hpp" | |
| 61 #include "runtime/objectMonitor.hpp" | |
| 62 #include "runtime/osThread.hpp" | |
| 63 #include "runtime/safepoint.hpp" | |
| 64 #include "runtime/sharedRuntime.hpp" | |
| 65 #include "runtime/statSampler.hpp" | |
| 66 #include "runtime/stubRoutines.hpp" | |
| 67 #include "runtime/task.hpp" | |
| 68 #include "runtime/threadCritical.hpp" | |
| 69 #include "runtime/threadLocalStorage.hpp" | |
| 70 #include "runtime/vframe.hpp" | |
| 71 #include "runtime/vframeArray.hpp" | |
| 72 #include "runtime/vframe_hp.hpp" | |
| 73 #include "runtime/vmThread.hpp" | |
| 74 #include "runtime/vm_operations.hpp" | |
| 75 #include "services/attachListener.hpp" | |
| 76 #include "services/management.hpp" | |
| 6197 | 77 #include "services/memTracker.hpp" |
| 1972 | 78 #include "services/threadService.hpp" |
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79 #include "trace/traceEventTypes.hpp" |
| 1972 | 80 #include "utilities/defaultStream.hpp" |
| 81 #include "utilities/dtrace.hpp" | |
| 82 #include "utilities/events.hpp" | |
| 83 #include "utilities/preserveException.hpp" | |
| 84 #ifdef TARGET_OS_FAMILY_linux | |
| 85 # include "os_linux.inline.hpp" | |
| 86 # include "thread_linux.inline.hpp" | |
| 87 #endif | |
| 88 #ifdef TARGET_OS_FAMILY_solaris | |
| 89 # include "os_solaris.inline.hpp" | |
| 90 # include "thread_solaris.inline.hpp" | |
| 91 #endif | |
| 92 #ifdef TARGET_OS_FAMILY_windows | |
| 93 # include "os_windows.inline.hpp" | |
| 94 # include "thread_windows.inline.hpp" | |
| 95 #endif | |
| 3960 | 96 #ifdef TARGET_OS_FAMILY_bsd |
| 97 # include "os_bsd.inline.hpp" | |
| 98 # include "thread_bsd.inline.hpp" | |
| 99 #endif | |
| 1972 | 100 #ifndef SERIALGC |
| 101 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
| 102 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 103 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
| 104 #endif | |
| 105 #ifdef COMPILER1 | |
| 106 #include "c1/c1_Compiler.hpp" | |
| 107 #endif | |
| 108 #ifdef COMPILER2 | |
| 109 #include "opto/c2compiler.hpp" | |
| 110 #include "opto/idealGraphPrinter.hpp" | |
| 111 #endif | |
| 0 | 112 |
| 113 #ifdef DTRACE_ENABLED | |
| 114 | |
| 115 // Only bother with this argument setup if dtrace is available | |
| 116 | |
| 4006 | 117 #ifndef USDT2 |
| 0 | 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
| 119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 120 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 121 intptr_t, intptr_t, bool); | |
| 122 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 123 intptr_t, intptr_t, bool); | |
| 124 | |
| 125 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 126 { \ | |
| 127 ResourceMark rm(this); \ | |
| 128 int len = 0; \ | |
| 129 const char* name = (javathread)->get_thread_name(); \ | |
| 130 len = strlen(name); \ | |
| 131 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 132 name, len, \ | |
| 133 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 134 (javathread)->osthread()->thread_id(), \ | |
| 135 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 136 } | |
| 137 | |
| 4006 | 138 #else /* USDT2 */ |
| 139 | |
| 140 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
| 141 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
| 142 | |
| 143 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 144 { \ | |
| 145 ResourceMark rm(this); \ | |
| 146 int len = 0; \ | |
| 147 const char* name = (javathread)->get_thread_name(); \ | |
| 148 len = strlen(name); \ | |
| 149 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
| 150 (char *) name, len, \ | |
| 151 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 152 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
| 153 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 154 } | |
| 155 | |
| 156 #endif /* USDT2 */ | |
| 157 | |
| 0 | 158 #else // ndef DTRACE_ENABLED |
| 159 | |
| 160 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 161 | |
| 162 #endif // ndef DTRACE_ENABLED | |
| 163 | |
| 6197 | 164 |
| 0 | 165 // Class hierarchy |
| 166 // - Thread | |
| 167 // - VMThread | |
| 168 // - WatcherThread | |
| 169 // - ConcurrentMarkSweepThread | |
| 170 // - JavaThread | |
| 171 // - CompilerThread | |
| 172 | |
| 173 // ======= Thread ======== | |
| 174 // Support for forcing alignment of thread objects for biased locking | |
| 6197 | 175 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
| 0 | 176 if (UseBiasedLocking) { |
| 177 const int alignment = markOopDesc::biased_lock_alignment; | |
| 178 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 6197 | 179 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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180 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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181 AllocFailStrategy::RETURN_NULL); |
| 0 | 182 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
| 183 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 184 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 185 "JavaThread alignment code overflowed allocated storage"); | |
| 186 if (TraceBiasedLocking) { | |
| 187 if (aligned_addr != real_malloc_addr) | |
| 188 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 189 real_malloc_addr, aligned_addr); | |
| 190 } | |
| 191 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 192 return aligned_addr; | |
| 193 } else { | |
| 6197 | 194 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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195 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
| 0 | 196 } |
| 197 } | |
| 198 | |
| 199 void Thread::operator delete(void* p) { | |
| 200 if (UseBiasedLocking) { | |
| 201 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 6197 | 202 FreeHeap(real_malloc_addr, mtThread); |
| 0 | 203 } else { |
| 6197 | 204 FreeHeap(p, mtThread); |
| 0 | 205 } |
| 206 } | |
| 207 | |
| 208 | |
| 209 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 210 // JavaThread | |
| 211 | |
| 212 | |
| 213 Thread::Thread() { | |
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214 // stack and get_thread |
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215 set_stack_base(NULL); |
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216 set_stack_size(0); |
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217 set_self_raw_id(0); |
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218 set_lgrp_id(-1); |
| 0 | 219 |
| 220 // allocated data structures | |
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221 set_osthread(NULL); |
| 6197 | 222 set_resource_area(new (mtThread)ResourceArea()); |
| 223 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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224 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
| 0 | 225 set_active_handles(NULL); |
| 226 set_free_handle_block(NULL); | |
| 227 set_last_handle_mark(NULL); | |
| 228 | |
| 229 // This initial value ==> never claimed. | |
| 230 _oops_do_parity = 0; | |
| 231 | |
| 232 // the handle mark links itself to last_handle_mark | |
| 233 new HandleMark(this); | |
| 234 | |
| 235 // plain initialization | |
| 236 debug_only(_owned_locks = NULL;) | |
| 237 debug_only(_allow_allocation_count = 0;) | |
| 238 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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239 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 240 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 241 _jvmti_env_iteration_count = 0; | |
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242 set_allocated_bytes(0); |
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243 set_trace_buffer(NULL); |
| 0 | 244 _vm_operation_started_count = 0; |
| 245 _vm_operation_completed_count = 0; | |
| 246 _current_pending_monitor = NULL; | |
| 247 _current_pending_monitor_is_from_java = true; | |
| 248 _current_waiting_monitor = NULL; | |
| 249 _num_nested_signal = 0; | |
| 250 omFreeList = NULL ; | |
| 251 omFreeCount = 0 ; | |
| 252 omFreeProvision = 32 ; | |
| 1587 | 253 omInUseList = NULL ; |
| 254 omInUseCount = 0 ; | |
| 0 | 255 |
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256 #ifdef ASSERT |
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257 _visited_for_critical_count = false; |
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258 #endif |
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259 |
| 0 | 260 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
| 261 _suspend_flags = 0; | |
| 262 | |
| 263 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 264 _hashStateX = os::random() ; | |
| 265 _hashStateY = 842502087 ; | |
| 266 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 267 _hashStateW = 273326509 ; | |
| 268 | |
| 269 _OnTrap = 0 ; | |
| 270 _schedctl = NULL ; | |
| 271 _Stalled = 0 ; | |
| 272 _TypeTag = 0x2BAD ; | |
| 273 | |
| 274 // Many of the following fields are effectively final - immutable | |
| 275 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 276 // construct until the _MutexEvent is initialized ... | |
| 277 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 278 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 279 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 280 // and ::Release() | |
| 281 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 282 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 283 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 284 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 285 | |
| 286 #ifdef CHECK_UNHANDLED_OOPS | |
| 287 if (CheckUnhandledOops) { | |
| 288 _unhandled_oops = new UnhandledOops(this); | |
| 289 } | |
| 290 #endif // CHECK_UNHANDLED_OOPS | |
| 291 #ifdef ASSERT | |
| 292 if (UseBiasedLocking) { | |
| 293 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 294 assert(this == _real_malloc_address || | |
| 295 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 296 "bug in forced alignment of thread objects"); | |
| 297 } | |
| 298 #endif /* ASSERT */ | |
| 299 } | |
| 300 | |
| 301 void Thread::initialize_thread_local_storage() { | |
| 302 // Note: Make sure this method only calls | |
| 303 // non-blocking operations. Otherwise, it might not work | |
| 304 // with the thread-startup/safepoint interaction. | |
| 305 | |
| 306 // During Java thread startup, safepoint code should allow this | |
| 307 // method to complete because it may need to allocate memory to | |
| 308 // store information for the new thread. | |
| 309 | |
| 310 // initialize structure dependent on thread local storage | |
| 311 ThreadLocalStorage::set_thread(this); | |
| 312 } | |
| 313 | |
| 314 void Thread::record_stack_base_and_size() { | |
| 315 set_stack_base(os::current_stack_base()); | |
| 316 set_stack_size(os::current_stack_size()); | |
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317 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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318 // in initialize_thread(). Without the adjustment, stack size is |
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319 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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320 // So far, only Solaris has real implementation of initialize_thread(). |
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321 // |
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322 // set up any platform-specific state. |
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323 os::initialize_thread(this); |
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324 |
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325 #if INCLUDE_NMT |
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326 // record thread's native stack, stack grows downward |
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327 address stack_low_addr = stack_base() - stack_size(); |
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328 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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329 CURRENT_PC); |
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330 #endif // INCLUDE_NMT |
| 0 | 331 } |
| 332 | |
| 333 | |
| 334 Thread::~Thread() { | |
| 335 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 336 ObjectSynchronizer::omFlush (this) ; | |
| 337 | |
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338 // stack_base can be NULL if the thread is never started or exited before |
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339 // record_stack_base_and_size called. Although, we would like to ensure |
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340 // that all started threads do call record_stack_base_and_size(), there is |
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341 // not proper way to enforce that. |
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342 #if INCLUDE_NMT |
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343 if (_stack_base != NULL) { |
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344 address low_stack_addr = stack_base() - stack_size(); |
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345 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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346 #ifdef ASSERT |
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347 set_stack_base(NULL); |
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348 #endif |
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349 } |
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350 #endif // INCLUDE_NMT |
| 6197 | 351 |
| 0 | 352 // deallocate data structures |
| 353 delete resource_area(); | |
| 354 // since the handle marks are using the handle area, we have to deallocated the root | |
| 355 // handle mark before deallocating the thread's handle area, | |
| 356 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 357 delete last_handle_mark(); | |
| 358 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 359 | |
| 360 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 361 // We NULL out the fields for good hygiene. | |
| 362 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 363 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 364 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 365 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 366 | |
| 367 delete handle_area(); | |
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368 delete metadata_handles(); |
| 0 | 369 |
| 370 // osthread() can be NULL, if creation of thread failed. | |
| 371 if (osthread() != NULL) os::free_thread(osthread()); | |
| 372 | |
| 373 delete _SR_lock; | |
| 374 | |
| 375 // clear thread local storage if the Thread is deleting itself | |
| 376 if (this == Thread::current()) { | |
| 377 ThreadLocalStorage::set_thread(NULL); | |
| 378 } else { | |
| 379 // In the case where we're not the current thread, invalidate all the | |
| 380 // caches in case some code tries to get the current thread or the | |
| 381 // thread that was destroyed, and gets stale information. | |
| 382 ThreadLocalStorage::invalidate_all(); | |
| 383 } | |
| 384 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 385 } | |
| 386 | |
| 387 // NOTE: dummy function for assertion purpose. | |
| 388 void Thread::run() { | |
| 389 ShouldNotReachHere(); | |
| 390 } | |
| 391 | |
| 392 #ifdef ASSERT | |
| 393 // Private method to check for dangling thread pointer | |
| 394 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 395 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 396 "possibility of dangling Thread pointer"); | |
| 397 } | |
| 398 #endif | |
| 399 | |
| 400 | |
| 401 #ifndef PRODUCT | |
| 402 // Tracing method for basic thread operations | |
| 403 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 404 if (!TraceThreadEvents) return; | |
| 405 ResourceMark rm; | |
| 406 ThreadCritical tc; | |
| 407 const char *name = "non-Java thread"; | |
| 408 int prio = -1; | |
| 409 if (thread->is_Java_thread() | |
| 410 && !thread->is_Compiler_thread()) { | |
| 411 // The Threads_lock must be held to get information about | |
| 412 // this thread but may not be in some situations when | |
| 413 // tracing thread events. | |
| 414 bool release_Threads_lock = false; | |
| 415 if (!Threads_lock->owned_by_self()) { | |
| 416 Threads_lock->lock(); | |
| 417 release_Threads_lock = true; | |
| 418 } | |
| 419 JavaThread* jt = (JavaThread *)thread; | |
| 420 name = (char *)jt->get_thread_name(); | |
| 421 oop thread_oop = jt->threadObj(); | |
| 422 if (thread_oop != NULL) { | |
| 423 prio = java_lang_Thread::priority(thread_oop); | |
| 424 } | |
| 425 if (release_Threads_lock) { | |
| 426 Threads_lock->unlock(); | |
| 427 } | |
| 428 } | |
| 429 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 430 } | |
| 431 #endif | |
| 432 | |
| 433 | |
| 434 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 435 trace("get priority", thread); | |
| 436 ThreadPriority priority; | |
| 437 // Can return an error! | |
| 438 (void)os::get_priority(thread, priority); | |
| 439 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 440 return priority; | |
| 441 } | |
| 442 | |
| 443 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 444 trace("set priority", thread); | |
| 445 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 446 // Can return an error! | |
| 447 (void)os::set_priority(thread, priority); | |
| 448 } | |
| 449 | |
| 450 | |
| 451 void Thread::start(Thread* thread) { | |
| 452 trace("start", thread); | |
| 453 // Start is different from resume in that its safety is guaranteed by context or | |
| 454 // being called from a Java method synchronized on the Thread object. | |
| 455 if (!DisableStartThread) { | |
| 456 if (thread->is_Java_thread()) { | |
| 457 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 458 // Can not set it after the thread started because we do not know the | |
| 459 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 460 // in SLEEPING or some other state. | |
| 461 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 462 java_lang_Thread::RUNNABLE); | |
| 463 } | |
| 464 os::start_thread(thread); | |
| 465 } | |
| 466 } | |
| 467 | |
| 468 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 469 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 470 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 471 VMThread::execute(vm_stop); | |
| 472 } | |
| 473 | |
| 474 | |
| 475 // | |
| 476 // Check if an external suspend request has completed (or has been | |
| 477 // cancelled). Returns true if the thread is externally suspended and | |
| 478 // false otherwise. | |
| 479 // | |
| 480 // The bits parameter returns information about the code path through | |
| 481 // the routine. Useful for debugging: | |
| 482 // | |
| 483 // set in is_ext_suspend_completed(): | |
| 484 // 0x00000001 - routine was entered | |
| 485 // 0x00000010 - routine return false at end | |
| 486 // 0x00000100 - thread exited (return false) | |
| 487 // 0x00000200 - suspend request cancelled (return false) | |
| 488 // 0x00000400 - thread suspended (return true) | |
| 489 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 490 // 0x00002000 - thread is native and walkable (return true) | |
| 491 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 492 // | |
| 493 // set in wait_for_ext_suspend_completion(): | |
| 494 // 0x00010000 - routine was entered | |
| 495 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 496 // 0x00040000 - thread suspended before loop (return true) | |
| 497 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 498 // 0x00100000 - thread suspended in loop (return true) | |
| 499 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 500 // | |
| 501 | |
| 502 // Helper class for tracing suspend wait debug bits. | |
| 503 // | |
| 504 // 0x00000100 indicates that the target thread exited before it could | |
| 505 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 506 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 507 // count as wait failures either. | |
| 508 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 509 | |
| 510 class TraceSuspendDebugBits : public StackObj { | |
| 511 private: | |
| 512 JavaThread * jt; | |
| 513 bool is_wait; | |
| 514 bool called_by_wait; // meaningful when !is_wait | |
| 515 uint32_t * bits; | |
| 516 | |
| 517 public: | |
| 518 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 519 uint32_t *_bits) { | |
| 520 jt = _jt; | |
| 521 is_wait = _is_wait; | |
| 522 called_by_wait = _called_by_wait; | |
| 523 bits = _bits; | |
| 524 } | |
| 525 | |
| 526 ~TraceSuspendDebugBits() { | |
| 527 if (!is_wait) { | |
| 528 #if 1 | |
| 529 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 530 // That trace is very chatty. | |
| 531 return; | |
| 532 #else | |
| 533 if (!called_by_wait) { | |
| 534 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 535 // trace calls to it from wait_for_ext_suspend_completion() | |
| 536 return; | |
| 537 } | |
| 538 #endif | |
| 539 } | |
| 540 | |
| 541 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 542 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 543 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 544 ResourceMark rm; | |
| 545 | |
| 546 tty->print_cr( | |
| 547 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 548 jt->get_thread_name(), *bits); | |
| 549 | |
| 550 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 551 } | |
| 552 } | |
| 553 } | |
| 554 }; | |
| 555 #undef DEBUG_FALSE_BITS | |
| 556 | |
| 557 | |
| 558 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 559 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 560 | |
| 561 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 562 bool do_trans_retry; // flag to force the retry | |
| 563 | |
| 564 *bits |= 0x00000001; | |
| 565 | |
| 566 do { | |
| 567 do_trans_retry = false; | |
| 568 | |
| 569 if (is_exiting()) { | |
| 570 // Thread is in the process of exiting. This is always checked | |
| 571 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 572 *bits |= 0x00000100; | |
| 573 return false; | |
| 574 } | |
| 575 | |
| 576 if (!is_external_suspend()) { | |
| 577 // Suspend request is cancelled. This is always checked before | |
| 578 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 579 // confusing the thread that made the suspend request. | |
| 580 *bits |= 0x00000200; | |
| 581 return false; | |
| 582 } | |
| 583 | |
| 584 if (is_ext_suspended()) { | |
| 585 // thread is suspended | |
| 586 *bits |= 0x00000400; | |
| 587 return true; | |
| 588 } | |
| 589 | |
| 590 // Now that we no longer do hard suspends of threads running | |
| 591 // native code, the target thread can be changing thread state | |
| 592 // while we are in this routine: | |
| 593 // | |
| 594 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 595 // | |
| 596 // We save a copy of the thread state as observed at this moment | |
| 597 // and make our decision about suspend completeness based on the | |
| 598 // copy. This closes the race where the thread state is seen as | |
| 599 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 600 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 601 JavaThreadState save_state = thread_state(); | |
| 602 | |
| 603 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 604 // If the thread's state is _thread_blocked and this blocking | |
| 605 // condition is known to be equivalent to a suspend, then we can | |
| 606 // consider the thread to be externally suspended. This means that | |
| 607 // the code that sets _thread_blocked has been modified to do | |
| 608 // self-suspension if the blocking condition releases. We also | |
| 609 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 610 // the _thread_blocked with self-suspension check. | |
| 611 // | |
| 612 // Return true since we wouldn't be here unless there was still an | |
| 613 // external suspend request. | |
| 614 *bits |= 0x00001000; | |
| 615 return true; | |
| 616 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 617 // Threads running native code will self-suspend on native==>VM/Java | |
| 618 // transitions. If its stack is walkable (should always be the case | |
| 619 // unless this function is called before the actual java_suspend() | |
| 620 // call), then the wait is done. | |
| 621 *bits |= 0x00002000; | |
| 622 return true; | |
| 623 } else if (!called_by_wait && !did_trans_retry && | |
| 624 save_state == _thread_in_native_trans && | |
| 625 frame_anchor()->walkable()) { | |
| 626 // The thread is transitioning from thread_in_native to another | |
| 627 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 628 // will force the thread to self-suspend. If it hasn't gotten | |
| 629 // there yet we may have caught the thread in-between the native | |
| 630 // code check above and the self-suspend. Lucky us. If we were | |
| 631 // called by wait_for_ext_suspend_completion(), then it | |
| 632 // will be doing the retries so we don't have to. | |
| 633 // | |
| 634 // Since we use the saved thread state in the if-statement above, | |
| 635 // there is a chance that the thread has already transitioned to | |
| 636 // _thread_blocked by the time we get here. In that case, we will | |
| 637 // make a single unnecessary pass through the logic below. This | |
| 638 // doesn't hurt anything since we still do the trans retry. | |
| 639 | |
| 640 *bits |= 0x00004000; | |
| 641 | |
| 642 // Once the thread leaves thread_in_native_trans for another | |
| 643 // thread state, we break out of this retry loop. We shouldn't | |
| 644 // need this flag to prevent us from getting back here, but | |
| 645 // sometimes paranoia is good. | |
| 646 did_trans_retry = true; | |
| 647 | |
| 648 // We wait for the thread to transition to a more usable state. | |
| 649 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 650 // We used to do an "os::yield_all(i)" call here with the intention | |
| 651 // that yielding would increase on each retry. However, the parameter | |
| 652 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 653 // on the SR_lock below provides a much more predictable scale up for | |
| 654 // the delay. It also provides a simple/direct point to check for any | |
| 655 // safepoint requests from the VMThread | |
| 656 | |
| 657 // temporarily drops SR_lock while doing wait with safepoint check | |
| 658 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 659 // and increase delay with each retry | |
| 660 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 661 | |
| 662 // check the actual thread state instead of what we saved above | |
| 663 if (thread_state() != _thread_in_native_trans) { | |
| 664 // the thread has transitioned to another thread state so | |
| 665 // try all the checks (except this one) one more time. | |
| 666 do_trans_retry = true; | |
| 667 break; | |
| 668 } | |
| 669 } // end retry loop | |
| 670 | |
| 671 | |
| 672 } | |
| 673 } while (do_trans_retry); | |
| 674 | |
| 675 *bits |= 0x00000010; | |
| 676 return false; | |
| 677 } | |
| 678 | |
| 679 // | |
| 680 // Wait for an external suspend request to complete (or be cancelled). | |
| 681 // Returns true if the thread is externally suspended and false otherwise. | |
| 682 // | |
| 683 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 684 uint32_t *bits) { | |
| 685 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 686 false /* !called_by_wait */, bits); | |
| 687 | |
| 688 // local flag copies to minimize SR_lock hold time | |
| 689 bool is_suspended; | |
| 690 bool pending; | |
| 691 uint32_t reset_bits; | |
| 692 | |
| 693 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 694 *bits |= 0x00010000; | |
| 695 | |
| 696 // We use reset_bits to reinitialize the bits value at the top of | |
| 697 // each retry loop. This allows the caller to make use of any | |
| 698 // unused bits for their own marking purposes. | |
| 699 reset_bits = *bits; | |
| 700 | |
| 701 { | |
| 702 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 703 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 704 delay, bits); | |
| 705 pending = is_external_suspend(); | |
| 706 } | |
| 707 // must release SR_lock to allow suspension to complete | |
| 708 | |
| 709 if (!pending) { | |
| 710 // A cancelled suspend request is the only false return from | |
| 711 // is_ext_suspend_completed() that keeps us from entering the | |
| 712 // retry loop. | |
| 713 *bits |= 0x00020000; | |
| 714 return false; | |
| 715 } | |
| 716 | |
| 717 if (is_suspended) { | |
| 718 *bits |= 0x00040000; | |
| 719 return true; | |
| 720 } | |
| 721 | |
| 722 for (int i = 1; i <= retries; i++) { | |
| 723 *bits = reset_bits; // reinit to only track last retry | |
| 724 | |
| 725 // We used to do an "os::yield_all(i)" call here with the intention | |
| 726 // that yielding would increase on each retry. However, the parameter | |
| 727 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 728 // on the SR_lock below provides a much more predictable scale up for | |
| 729 // the delay. It also provides a simple/direct point to check for any | |
| 730 // safepoint requests from the VMThread | |
| 731 | |
| 732 { | |
| 733 MutexLocker ml(SR_lock()); | |
| 734 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 735 // can also call this) and increase delay with each retry | |
| 736 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 737 | |
| 738 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 739 delay, bits); | |
| 740 | |
| 741 // It is possible for the external suspend request to be cancelled | |
| 742 // (by a resume) before the actual suspend operation is completed. | |
| 743 // Refresh our local copy to see if we still need to wait. | |
| 744 pending = is_external_suspend(); | |
| 745 } | |
| 746 | |
| 747 if (!pending) { | |
| 748 // A cancelled suspend request is the only false return from | |
| 749 // is_ext_suspend_completed() that keeps us from staying in the | |
| 750 // retry loop. | |
| 751 *bits |= 0x00080000; | |
| 752 return false; | |
| 753 } | |
| 754 | |
| 755 if (is_suspended) { | |
| 756 *bits |= 0x00100000; | |
| 757 return true; | |
| 758 } | |
| 759 } // end retry loop | |
| 760 | |
| 761 // thread did not suspend after all our retries | |
| 762 *bits |= 0x00200000; | |
| 763 return false; | |
| 764 } | |
| 765 | |
| 766 #ifndef PRODUCT | |
| 767 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 768 | |
| 769 // This should not need to be atomic as the only way for simultaneous | |
| 770 // updates is via interrupts. Even then this should be rare or non-existant | |
| 771 // and we don't care that much anyway. | |
| 772 | |
| 773 int index = _jmp_ring_index; | |
| 774 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 775 _jmp_ring[index]._target = (intptr_t) target; | |
| 776 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 777 _jmp_ring[index]._file = file; | |
| 778 _jmp_ring[index]._line = line; | |
| 779 } | |
| 780 #endif /* PRODUCT */ | |
| 781 | |
| 782 // Called by flat profiler | |
| 783 // Callers have already called wait_for_ext_suspend_completion | |
| 784 // The assertion for that is currently too complex to put here: | |
| 785 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 786 bool gotframe = false; | |
| 787 // self suspension saves needed state. | |
| 788 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 789 *_fr = pd_last_frame(); | |
| 790 gotframe = true; | |
| 791 } | |
| 792 return gotframe; | |
| 793 } | |
| 794 | |
| 795 void Thread::interrupt(Thread* thread) { | |
| 796 trace("interrupt", thread); | |
| 797 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 798 os::interrupt(thread); | |
| 799 } | |
| 800 | |
| 801 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 802 trace("is_interrupted", thread); | |
| 803 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 804 // Note: If clear_interrupted==false, this simply fetches and | |
| 805 // returns the value of the field osthread()->interrupted(). | |
| 806 return os::is_interrupted(thread, clear_interrupted); | |
| 807 } | |
| 808 | |
| 809 | |
| 810 // GC Support | |
| 811 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 812 jint thread_parity = _oops_do_parity; | |
| 813 if (thread_parity != strong_roots_parity) { | |
| 814 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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815 if (res == thread_parity) { |
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816 return true; |
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817 } else { |
| 0 | 818 guarantee(res == strong_roots_parity, "Or else what?"); |
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819 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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820 "Should only fail when parallel."); |
| 0 | 821 return false; |
| 822 } | |
| 823 } | |
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824 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
| 0 | 825 "Should only fail when parallel."); |
| 826 return false; | |
| 827 } | |
| 828 | |
|
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829 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 830 active_handles()->oops_do(f); |
| 831 // Do oop for ThreadShadow | |
| 832 f->do_oop((oop*)&_pending_exception); | |
| 833 handle_area()->oops_do(f); | |
| 834 } | |
| 835 | |
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836 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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837 // no nmethods in a generic thread... |
| 0 | 838 } |
| 839 | |
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840 void Thread::metadata_do(void f(Metadata*)) { |
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841 if (metadata_handles() != NULL) { |
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842 for (int i = 0; i< metadata_handles()->length(); i++) { |
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843 f(metadata_handles()->at(i)); |
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844 } |
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845 } |
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846 } |
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847 |
| 0 | 848 void Thread::print_on(outputStream* st) const { |
| 849 // get_priority assumes osthread initialized | |
| 850 if (osthread() != NULL) { | |
| 6766 | 851 int os_prio; |
| 852 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
| 853 st->print("os_prio=%d ", os_prio); | |
| 854 } | |
| 855 st->print("tid=" INTPTR_FORMAT " ", this); | |
| 0 | 856 osthread()->print_on(st); |
| 857 } | |
| 858 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 859 } | |
| 860 | |
| 861 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 862 // any lock or allocate memory. | |
| 863 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 864 if (is_VM_thread()) st->print("VMThread"); | |
| 865 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 866 else if (is_Java_thread()) st->print("JavaThread"); | |
| 867 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 868 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 869 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 870 else st->print("Thread"); | |
| 871 | |
| 872 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 873 _stack_base - _stack_size, _stack_base); | |
| 874 | |
| 875 if (osthread()) { | |
| 876 st->print(" [id=%d]", osthread()->thread_id()); | |
| 877 } | |
| 878 } | |
| 879 | |
| 880 #ifdef ASSERT | |
| 881 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 882 Monitor *cur = _owned_locks; | |
| 883 if (cur == NULL) { | |
| 884 st->print(" (no locks) "); | |
| 885 } else { | |
| 886 st->print_cr(" Locks owned:"); | |
| 887 while(cur) { | |
| 888 cur->print_on(st); | |
| 889 cur = cur->next(); | |
| 890 } | |
| 891 } | |
| 892 } | |
| 893 | |
| 894 static int ref_use_count = 0; | |
| 895 | |
| 896 bool Thread::owns_locks_but_compiled_lock() const { | |
| 897 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 898 if (cur != Compile_lock) return true; | |
| 899 } | |
| 900 return false; | |
| 901 } | |
| 902 | |
| 903 | |
| 904 #endif | |
| 905 | |
| 906 #ifndef PRODUCT | |
| 907 | |
| 908 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 909 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 910 // no threads which allow_vm_block's are held | |
| 911 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 912 // Check if current thread is allowed to block at a safepoint | |
| 913 if (!(_allow_safepoint_count == 0)) | |
| 914 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 915 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 916 fatal("LEAF method calling lock?"); | |
| 917 } | |
| 918 | |
| 919 #ifdef ASSERT | |
| 920 if (potential_vm_operation && is_Java_thread() | |
| 921 && !Universe::is_bootstrapping()) { | |
| 922 // Make sure we do not hold any locks that the VM thread also uses. | |
| 923 // This could potentially lead to deadlocks | |
| 924 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 925 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 926 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 927 // since it is used to transfer control between JavaThreads and the VMThread | |
| 928 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 929 if ( (cur->allow_vm_block() && | |
| 930 cur != Threads_lock && | |
| 931 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 932 cur != VMOperationRequest_lock && | |
| 933 cur != VMOperationQueue_lock) || | |
| 934 cur->rank() == Mutex::special) { | |
| 935 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 936 } | |
| 937 } | |
| 938 } | |
| 939 | |
| 940 if (GCALotAtAllSafepoints) { | |
| 941 // We could enter a safepoint here and thus have a gc | |
| 942 InterfaceSupport::check_gc_alot(); | |
| 943 } | |
| 944 #endif | |
| 945 } | |
| 946 #endif | |
| 947 | |
| 948 bool Thread::is_in_stack(address adr) const { | |
| 949 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 950 address end = os::current_stack_pointer(); | |
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951 // Allow non Java threads to call this without stack_base |
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952 if (_stack_base == NULL) return true; |
| 0 | 953 if (stack_base() >= adr && adr >= end) return true; |
| 954 | |
| 955 return false; | |
| 956 } | |
| 957 | |
| 958 | |
| 959 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 960 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 961 // used for compilation in the future. If that change is made, the need for these methods | |
| 962 // should be revisited, and they should be removed if possible. | |
| 963 | |
| 964 bool Thread::is_lock_owned(address adr) const { | |
|
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965 return on_local_stack(adr); |
| 0 | 966 } |
| 967 | |
| 968 bool Thread::set_as_starting_thread() { | |
| 969 // NOTE: this must be called inside the main thread. | |
| 970 return os::create_main_thread((JavaThread*)this); | |
| 971 } | |
| 972 | |
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973 static void initialize_class(Symbol* class_name, TRAPS) { |
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974 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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975 InstanceKlass::cast(klass)->initialize(CHECK); |
| 0 | 976 } |
| 977 | |
| 978 | |
| 979 // Creates the initial ThreadGroup | |
| 980 static Handle create_initial_thread_group(TRAPS) { | |
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981 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
| 0 | 982 instanceKlassHandle klass (THREAD, k); |
| 983 | |
| 984 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 985 { | |
| 986 JavaValue result(T_VOID); | |
| 987 JavaCalls::call_special(&result, | |
| 988 system_instance, | |
| 989 klass, | |
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990 vmSymbols::object_initializer_name(), |
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991 vmSymbols::void_method_signature(), |
| 0 | 992 CHECK_NH); |
| 993 } | |
| 994 Universe::set_system_thread_group(system_instance()); | |
| 995 | |
| 996 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 997 { | |
| 998 JavaValue result(T_VOID); | |
| 999 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 1000 JavaCalls::call_special(&result, | |
| 1001 main_instance, | |
| 1002 klass, | |
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1003 vmSymbols::object_initializer_name(), |
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1004 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1005 system_instance, |
| 1006 string, | |
| 1007 CHECK_NH); | |
| 1008 } | |
| 1009 return main_instance; | |
| 1010 } | |
| 1011 | |
| 1012 // Creates the initial Thread | |
| 1013 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1014 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
| 0 | 1015 instanceKlassHandle klass (THREAD, k); |
| 1016 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 1017 | |
| 1018 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 1019 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1020 thread->set_threadObj(thread_oop()); | |
| 1021 | |
| 1022 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 1023 | |
| 1024 JavaValue result(T_VOID); | |
| 1025 JavaCalls::call_special(&result, thread_oop, | |
| 1026 klass, | |
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1027 vmSymbols::object_initializer_name(), |
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1028 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1029 thread_group, |
| 1030 string, | |
| 1031 CHECK_NULL); | |
| 1032 return thread_oop(); | |
| 1033 } | |
| 1034 | |
| 1035 static void call_initializeSystemClass(TRAPS) { | |
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1036 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1037 instanceKlassHandle klass (THREAD, k); |
| 1038 | |
| 1039 JavaValue result(T_VOID); | |
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1040 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1041 vmSymbols::void_method_signature(), CHECK); |
| 0 | 1042 } |
| 1043 | |
| 6181 | 1044 char java_runtime_name[128] = ""; |
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1045 char java_runtime_version[128] = ""; |
| 6181 | 1046 |
| 1047 // extract the JRE name from sun.misc.Version.java_runtime_name | |
| 1048 static const char* get_java_runtime_name(TRAPS) { | |
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1049 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
| 6181 | 1050 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
| 1051 fieldDescriptor fd; | |
| 1052 bool found = k != NULL && | |
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1053 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
| 6181 | 1054 vmSymbols::string_signature(), &fd); |
| 1055 if (found) { | |
| 1056 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
| 1057 if (name_oop == NULL) | |
| 1058 return NULL; | |
| 1059 const char* name = java_lang_String::as_utf8_string(name_oop, | |
| 1060 java_runtime_name, | |
| 1061 sizeof(java_runtime_name)); | |
| 1062 return name; | |
| 1063 } else { | |
| 1064 return NULL; | |
| 1065 } | |
| 1066 } | |
| 1067 | |
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1068 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1069 static const char* get_java_runtime_version(TRAPS) { |
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1070 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1071 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1072 fieldDescriptor fd; |
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1073 bool found = k != NULL && |
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1074 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1075 vmSymbols::string_signature(), &fd); |
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1076 if (found) { |
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1077 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1078 if (name_oop == NULL) |
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1079 return NULL; |
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1080 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1081 java_runtime_version, |
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1082 sizeof(java_runtime_version)); |
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1083 return name; |
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1084 } else { |
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1085 return NULL; |
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1086 } |
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1087 } |
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1088 |
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1089 // General purpose hook into Java code, run once when the VM is initialized. |
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1090 // The Java library method itself may be changed independently from the VM. |
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1091 static void call_postVMInitHook(TRAPS) { |
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1092 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1093 instanceKlassHandle klass (THREAD, k); |
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1094 if (klass.not_null()) { |
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1095 JavaValue result(T_VOID); |
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1096 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1097 vmSymbols::void_method_signature(), |
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1098 CHECK); |
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1099 } |
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1100 } |
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1101 |
| 0 | 1102 static void reset_vm_info_property(TRAPS) { |
| 1103 // the vm info string | |
| 1104 ResourceMark rm(THREAD); | |
| 1105 const char *vm_info = VM_Version::vm_info_string(); | |
| 1106 | |
| 1107 // java.lang.System class | |
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1108 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
| 0 | 1109 instanceKlassHandle klass (THREAD, k); |
| 1110 | |
| 1111 // setProperty arguments | |
| 1112 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 1113 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 1114 | |
| 1115 // return value | |
| 1116 JavaValue r(T_OBJECT); | |
| 1117 | |
| 1118 // public static String setProperty(String key, String value); | |
| 1119 JavaCalls::call_static(&r, | |
| 1120 klass, | |
|
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1121 vmSymbols::setProperty_name(), |
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1122 vmSymbols::string_string_string_signature(), |
| 0 | 1123 key_str, |
| 1124 value_str, | |
| 1125 CHECK); | |
| 1126 } | |
| 1127 | |
| 1128 | |
| 1129 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 1130 assert(thread_group.not_null(), "thread group should be specified"); | |
| 1131 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 1132 | |
|
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1133 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 1134 instanceKlassHandle klass (THREAD, k); |
| 1135 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 1136 | |
| 1137 java_lang_Thread::set_thread(thread_oop(), this); | |
| 1138 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 1139 set_threadObj(thread_oop()); | |
| 1140 | |
| 1141 JavaValue result(T_VOID); | |
| 1142 if (thread_name != NULL) { | |
| 1143 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 1144 // Thread gets assigned specified name and null target | |
| 1145 JavaCalls::call_special(&result, | |
| 1146 thread_oop, | |
| 1147 klass, | |
|
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1148 vmSymbols::object_initializer_name(), |
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1149 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 1150 thread_group, // Argument 1 |
| 1151 name, // Argument 2 | |
| 1152 THREAD); | |
| 1153 } else { | |
| 1154 // Thread gets assigned name "Thread-nnn" and null target | |
| 1155 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 1156 JavaCalls::call_special(&result, | |
| 1157 thread_oop, | |
| 1158 klass, | |
|
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1159 vmSymbols::object_initializer_name(), |
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1160 vmSymbols::threadgroup_runnable_void_signature(), |
| 0 | 1161 thread_group, // Argument 1 |
| 1162 Handle(), // Argument 2 | |
| 1163 THREAD); | |
| 1164 } | |
| 1165 | |
| 1166 | |
| 1167 if (daemon) { | |
| 1168 java_lang_Thread::set_daemon(thread_oop()); | |
| 1169 } | |
| 1170 | |
| 1171 if (HAS_PENDING_EXCEPTION) { | |
| 1172 return; | |
| 1173 } | |
| 1174 | |
| 1142 | 1175 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1176 Handle threadObj(this, this->threadObj()); |
| 1177 | |
| 1178 JavaCalls::call_special(&result, | |
| 1179 thread_group, | |
| 1180 group, | |
|
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1181 vmSymbols::add_method_name(), |
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1182 vmSymbols::thread_void_signature(), |
| 0 | 1183 threadObj, // Arg 1 |
| 1184 THREAD); | |
| 1185 | |
| 1186 | |
| 1187 } | |
| 1188 | |
| 1189 // NamedThread -- non-JavaThread subclasses with multiple | |
| 1190 // uniquely named instances should derive from this. | |
| 1191 NamedThread::NamedThread() : Thread() { | |
| 1192 _name = NULL; | |
|
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1193 _processed_thread = NULL; |
| 0 | 1194 } |
| 1195 | |
| 1196 NamedThread::~NamedThread() { | |
| 1197 if (_name != NULL) { | |
| 6197 | 1198 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
| 0 | 1199 _name = NULL; |
| 1200 } | |
| 1201 } | |
| 1202 | |
| 1203 void NamedThread::set_name(const char* format, ...) { | |
| 1204 guarantee(_name == NULL, "Only get to set name once."); | |
| 6197 | 1205 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
| 0 | 1206 guarantee(_name != NULL, "alloc failure"); |
| 1207 va_list ap; | |
| 1208 va_start(ap, format); | |
| 1209 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 1210 va_end(ap); | |
| 1211 } | |
| 1212 | |
| 1213 // ======= WatcherThread ======== | |
| 1214 | |
| 1215 // The watcher thread exists to simulate timer interrupts. It should | |
| 1216 // be replaced by an abstraction over whatever native support for | |
| 1217 // timer interrupts exists on the platform. | |
| 1218 | |
| 1219 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
|
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1220 volatile bool WatcherThread::_should_terminate = false; |
| 0 | 1221 |
| 1222 WatcherThread::WatcherThread() : Thread() { | |
| 1223 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1224 if (os::create_thread(this, os::watcher_thread)) { | |
| 1225 _watcher_thread = this; | |
| 1226 | |
| 1227 // Set the watcher thread to the highest OS priority which should not be | |
| 1228 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1229 // is created. The only normal thread using this priority is the reference | |
| 1230 // handler thread, which runs for very short intervals only. | |
| 1231 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1232 // will be inaccurate. | |
| 1233 os::set_priority(this, MaxPriority); | |
| 1234 if (!DisableStartThread) { | |
| 1235 os::start_thread(this); | |
| 1236 } | |
| 1237 } | |
| 1238 } | |
| 1239 | |
| 1240 void WatcherThread::run() { | |
| 1241 assert(this == watcher_thread(), "just checking"); | |
| 1242 | |
| 1243 this->record_stack_base_and_size(); | |
| 1244 this->initialize_thread_local_storage(); | |
| 1245 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1246 while(!_should_terminate) { | |
| 1247 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1248 assert(watcher_thread() == this, "thread consistency check"); | |
| 1249 | |
| 1250 // Calculate how long it'll be until the next PeriodicTask work | |
| 1251 // should be done, and sleep that amount of time. | |
|
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1252 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1253 |
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1254 // we expect this to timeout - we only ever get unparked when |
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1255 // we should terminate |
|
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1256 { |
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1257 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1258 |
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1259 jlong prev_time = os::javaTimeNanos(); |
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1260 for (;;) { |
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1261 int res= _SleepEvent->park(time_to_wait); |
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1262 if (res == OS_TIMEOUT || _should_terminate) |
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1263 break; |
|
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1264 // spurious wakeup of some kind |
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1265 jlong now = os::javaTimeNanos(); |
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1266 time_to_wait -= (now - prev_time) / 1000000; |
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1267 if (time_to_wait <= 0) |
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1268 break; |
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1269 prev_time = now; |
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1270 } |
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1271 } |
| 0 | 1272 |
| 1273 if (is_error_reported()) { | |
| 1274 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1275 // should abort JVM after creating an error log file. However in some | |
| 1276 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1277 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1278 // | |
| 1279 // This code is in WatcherThread because WatcherThread wakes up | |
| 1280 // periodically so the fatal error handler doesn't need to do anything; | |
| 1281 // also because the WatcherThread is less likely to crash than other | |
| 1282 // threads. | |
| 1283 | |
| 1284 for (;;) { | |
| 1285 if (!ShowMessageBoxOnError | |
| 1286 && (OnError == NULL || OnError[0] == '\0') | |
| 1287 && Arguments::abort_hook() == NULL) { | |
| 1288 os::sleep(this, 2 * 60 * 1000, false); | |
| 1289 fdStream err(defaultStream::output_fd()); | |
| 1290 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1291 // skip atexit/vm_exit/vm_abort hooks | |
| 1292 os::die(); | |
| 1293 } | |
| 1294 | |
| 1295 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1296 // ShowMessageBoxOnError when it is ready to abort. | |
| 1297 os::sleep(this, 5 * 1000, false); | |
| 1298 } | |
| 1299 } | |
| 1300 | |
| 1301 PeriodicTask::real_time_tick(time_to_wait); | |
| 1302 | |
| 1303 // If we have no more tasks left due to dynamic disenrollment, | |
| 1304 // shut down the thread since we don't currently support dynamic enrollment | |
| 1305 if (PeriodicTask::num_tasks() == 0) { | |
| 1306 _should_terminate = true; | |
| 1307 } | |
| 1308 } | |
| 1309 | |
| 1310 // Signal that it is terminated | |
| 1311 { | |
| 1312 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1313 _watcher_thread = NULL; | |
| 1314 Terminator_lock->notify(); | |
| 1315 } | |
| 1316 | |
| 1317 // Thread destructor usually does this.. | |
| 1318 ThreadLocalStorage::set_thread(NULL); | |
| 1319 } | |
| 1320 | |
| 1321 void WatcherThread::start() { | |
| 1322 if (watcher_thread() == NULL) { | |
| 1323 _should_terminate = false; | |
| 1324 // Create the single instance of WatcherThread | |
| 1325 new WatcherThread(); | |
| 1326 } | |
| 1327 } | |
| 1328 | |
| 1329 void WatcherThread::stop() { | |
| 1330 // it is ok to take late safepoints here, if needed | |
| 1331 MutexLocker mu(Terminator_lock); | |
| 1332 _should_terminate = true; | |
|
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1333 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1334 |
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1335 Thread* watcher = watcher_thread(); |
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1336 if (watcher != NULL) |
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1337 watcher->_SleepEvent->unpark(); |
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1338 |
| 0 | 1339 while(watcher_thread() != NULL) { |
| 1340 // This wait should make safepoint checks, wait without a timeout, | |
| 1341 // and wait as a suspend-equivalent condition. | |
| 1342 // | |
| 1343 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1344 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1345 // FlatProfiler task, is waiting for the external suspend request on | |
| 1346 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1347 // eventually timeout, but that takes time. Making this wait a | |
| 1348 // suspend-equivalent condition solves that timeout problem. | |
| 1349 // | |
| 1350 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1351 Mutex::_as_suspend_equivalent_flag); | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 void WatcherThread::print_on(outputStream* st) const { | |
| 1356 st->print("\"%s\" ", name()); | |
| 1357 Thread::print_on(st); | |
| 1358 st->cr(); | |
| 1359 } | |
| 1360 | |
| 1361 // ======= JavaThread ======== | |
| 1362 | |
| 1363 // A JavaThread is a normal Java thread | |
| 1364 | |
| 1365 void JavaThread::initialize() { | |
| 1366 // Initialize fields | |
|
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1367 |
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1368 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1369 set_claimed_par_id(-1); |
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1370 |
| 0 | 1371 set_saved_exception_pc(NULL); |
| 1372 set_threadObj(NULL); | |
| 1373 _anchor.clear(); | |
| 1374 set_entry_point(NULL); | |
| 1375 set_jni_functions(jni_functions()); | |
| 1376 set_callee_target(NULL); | |
| 1377 set_vm_result(NULL); | |
| 1378 set_vm_result_2(NULL); | |
| 1379 set_vframe_array_head(NULL); | |
| 1380 set_vframe_array_last(NULL); | |
| 1381 set_deferred_locals(NULL); | |
| 1382 set_deopt_mark(NULL); | |
|
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1383 set_deopt_nmethod(NULL); |
| 0 | 1384 clear_must_deopt_id(); |
| 1385 set_monitor_chunks(NULL); | |
| 1386 set_next(NULL); | |
| 1387 set_thread_state(_thread_new); | |
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1388 #if INCLUDE_NMT |
| 6197 | 1389 set_recorder(NULL); |
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1390 #endif |
| 0 | 1391 _terminated = _not_terminated; |
| 1392 _privileged_stack_top = NULL; | |
| 1393 _array_for_gc = NULL; | |
| 1394 _suspend_equivalent = false; | |
| 1395 _in_deopt_handler = 0; | |
| 1396 _doing_unsafe_access = false; | |
| 1397 _stack_guard_state = stack_guard_unused; | |
| 1398 _exception_oop = NULL; | |
| 1399 _exception_pc = 0; | |
| 1400 _exception_handler_pc = 0; | |
| 1903 | 1401 _is_method_handle_return = 0; |
| 0 | 1402 _jvmti_thread_state= NULL; |
|
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1403 _should_post_on_exceptions_flag = JNI_FALSE; |
| 0 | 1404 _jvmti_get_loaded_classes_closure = NULL; |
| 1405 _interp_only_mode = 0; | |
| 1406 _special_runtime_exit_condition = _no_async_condition; | |
| 1407 _pending_async_exception = NULL; | |
| 1408 _is_compiling = false; | |
| 1409 _thread_stat = NULL; | |
| 1410 _thread_stat = new ThreadStatistics(); | |
| 1411 _blocked_on_compilation = false; | |
| 1412 _jni_active_critical = 0; | |
| 1413 _do_not_unlock_if_synchronized = false; | |
| 1414 _cached_monitor_info = NULL; | |
| 1415 _parker = Parker::Allocate(this) ; | |
| 1416 | |
| 1417 #ifndef PRODUCT | |
| 1418 _jmp_ring_index = 0; | |
| 1419 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1420 record_jump(NULL, NULL, NULL, 0); | |
| 1421 } | |
| 1422 #endif /* PRODUCT */ | |
| 1423 | |
| 1424 set_thread_profiler(NULL); | |
| 1425 if (FlatProfiler::is_active()) { | |
| 1426 // This is where we would decide to either give each thread it's own profiler | |
| 1427 // or use one global one from FlatProfiler, | |
| 1428 // or up to some count of the number of profiled threads, etc. | |
| 1429 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1430 pp->engage(); | |
| 1431 set_thread_profiler(pp); | |
| 1432 } | |
| 1433 | |
| 1434 // Setup safepoint state info for this thread | |
| 1435 ThreadSafepointState::create(this); | |
| 1436 | |
| 1437 debug_only(_java_call_counter = 0); | |
| 1438 | |
| 1439 // JVMTI PopFrame support | |
| 1440 _popframe_condition = popframe_inactive; | |
| 1441 _popframe_preserved_args = NULL; | |
| 1442 _popframe_preserved_args_size = 0; | |
| 1443 | |
| 1444 pd_initialize(); | |
| 1445 } | |
| 1446 | |
|
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1447 #ifndef SERIALGC |
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1448 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1449 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1450 #endif // !SERIALGC |
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1451 |
| 4006 | 1452 JavaThread::JavaThread(bool is_attaching_via_jni) : |
|
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1453 Thread() |
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1454 #ifndef SERIALGC |
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1455 , _satb_mark_queue(&_satb_mark_queue_set), |
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1456 _dirty_card_queue(&_dirty_card_queue_set) |
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1457 #endif // !SERIALGC |
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1458 { |
| 0 | 1459 initialize(); |
| 4006 | 1460 if (is_attaching_via_jni) { |
| 1461 _jni_attach_state = _attaching_via_jni; | |
| 1462 } else { | |
| 1463 _jni_attach_state = _not_attaching_via_jni; | |
| 1464 } | |
|
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1465 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
| 6197 | 1466 _safepoint_visible = false; |
| 0 | 1467 } |
| 1468 | |
| 1469 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1470 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1471 return true; // Stack already guarded or guard pages not needed. | |
| 1472 } | |
| 1473 | |
| 1474 if (register_stack_overflow()) { | |
| 1475 // For those architectures which have separate register and | |
| 1476 // memory stacks, we must check the register stack to see if | |
| 1477 // it has overflowed. | |
| 1478 return false; | |
| 1479 } | |
| 1480 | |
| 1481 // Java code never executes within the yellow zone: the latter is only | |
| 1482 // there to provoke an exception during stack banging. If java code | |
| 1483 // is executing there, either StackShadowPages should be larger, or | |
| 1484 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1485 // when it should. | |
| 1486 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1487 | |
| 1488 enable_stack_yellow_zone(); | |
| 1489 return true; | |
| 1490 } | |
| 1491 | |
| 1492 bool JavaThread::reguard_stack(void) { | |
| 1493 return reguard_stack(os::current_stack_pointer()); | |
| 1494 } | |
| 1495 | |
| 1496 | |
| 1497 void JavaThread::block_if_vm_exited() { | |
| 1498 if (_terminated == _vm_exited) { | |
| 1499 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1500 // we will block here forever | |
| 1501 Threads_lock->lock_without_safepoint_check(); | |
| 1502 ShouldNotReachHere(); | |
| 1503 } | |
| 1504 } | |
| 1505 | |
| 1506 | |
| 1507 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1508 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1509 | |
|
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1510 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1511 Thread() |
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1512 #ifndef SERIALGC |
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1513 , _satb_mark_queue(&_satb_mark_queue_set), |
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1514 _dirty_card_queue(&_dirty_card_queue_set) |
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1515 #endif // !SERIALGC |
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1516 { |
| 0 | 1517 if (TraceThreadEvents) { |
| 1518 tty->print_cr("creating thread %p", this); | |
| 1519 } | |
| 1520 initialize(); | |
| 4006 | 1521 _jni_attach_state = _not_attaching_via_jni; |
| 0 | 1522 set_entry_point(entry_point); |
| 1523 // Create the native thread itself. | |
| 1524 // %note runtime_23 | |
| 1525 os::ThreadType thr_type = os::java_thread; | |
| 1526 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1527 os::java_thread; | |
| 1528 os::create_thread(this, thr_type, stack_sz); | |
| 6197 | 1529 _safepoint_visible = false; |
| 0 | 1530 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
| 1531 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1532 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1533 // the exception consists of creating the exception object & initializing it, initialization | |
| 1534 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1535 // | |
| 1536 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1537 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1538 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1539 // object must be fully initialized (take a look at JVM_Start) | |
| 1540 } | |
| 1541 | |
| 1542 JavaThread::~JavaThread() { | |
| 1543 if (TraceThreadEvents) { | |
| 1544 tty->print_cr("terminate thread %p", this); | |
| 1545 } | |
| 1546 | |
|
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1547 // By now, this thread should already be invisible to safepoint, |
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1548 // and its per-thread recorder also collected. |
| 6197 | 1549 assert(!is_safepoint_visible(), "wrong state"); |
|
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1550 #if INCLUDE_NMT |
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1551 assert(get_recorder() == NULL, "Already collected"); |
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1552 #endif // INCLUDE_NMT |
| 6197 | 1553 |
| 0 | 1554 // JSR166 -- return the parker to the free list |
| 1555 Parker::Release(_parker); | |
| 1556 _parker = NULL ; | |
| 1557 | |
| 1558 // Free any remaining previous UnrollBlock | |
| 1559 vframeArray* old_array = vframe_array_last(); | |
| 1560 | |
| 1561 if (old_array != NULL) { | |
| 1562 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1563 old_array->set_unroll_block(NULL); | |
| 1564 delete old_info; | |
| 1565 delete old_array; | |
| 1566 } | |
| 1567 | |
| 1568 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1569 if (deferred != NULL) { | |
| 1570 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1571 assert(deferred->length() != 0, "empty array!"); | |
| 1572 do { | |
| 1573 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1574 deferred->remove_at(0); | |
| 1575 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1576 delete dlv; | |
| 1577 } while (deferred->length() != 0); | |
| 1578 delete deferred; | |
| 1579 } | |
| 1580 | |
| 1581 // All Java related clean up happens in exit | |
| 1582 ThreadSafepointState::destroy(this); | |
| 1583 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1584 if (_thread_stat != NULL) delete _thread_stat; | |
| 1585 } | |
| 1586 | |
| 1587 | |
| 1588 // The first routine called by a new Java thread | |
| 1589 void JavaThread::run() { | |
| 1590 // initialize thread-local alloc buffer related fields | |
| 1591 this->initialize_tlab(); | |
| 1592 | |
| 1593 // used to test validitity of stack trace backs | |
| 1594 this->record_base_of_stack_pointer(); | |
| 1595 | |
| 1596 // Record real stack base and size. | |
| 1597 this->record_stack_base_and_size(); | |
| 1598 | |
| 1599 // Initialize thread local storage; set before calling MutexLocker | |
| 1600 this->initialize_thread_local_storage(); | |
| 1601 | |
| 1602 this->create_stack_guard_pages(); | |
| 1603 | |
|
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1604 this->cache_global_variables(); |
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1605 |
| 0 | 1606 // Thread is now sufficient initialized to be handled by the safepoint code as being |
| 1607 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1608 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1609 | |
| 1610 assert(JavaThread::current() == this, "sanity check"); | |
| 1611 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1612 | |
| 1613 DTRACE_THREAD_PROBE(start, this); | |
| 1614 | |
| 1615 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1616 // been completed. | |
| 1617 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1618 | |
| 1619 if (JvmtiExport::should_post_thread_life()) { | |
| 1620 JvmtiExport::post_thread_start(this); | |
| 1621 } | |
| 1622 | |
|
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1623 EVENT_BEGIN(TraceEventThreadStart, event); |
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1624 EVENT_COMMIT(event, |
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1625 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1626 |
| 0 | 1627 // We call another function to do the rest so we are sure that the stack addresses used |
| 1628 // from there will be lower than the stack base just computed | |
| 1629 thread_main_inner(); | |
| 1630 | |
| 1631 // Note, thread is no longer valid at this point! | |
| 1632 } | |
| 1633 | |
| 1634 | |
| 1635 void JavaThread::thread_main_inner() { | |
| 1636 assert(JavaThread::current() == this, "sanity check"); | |
| 1637 assert(this->threadObj() != NULL, "just checking"); | |
| 1638 | |
|
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1639 // Execute thread entry point unless this thread has a pending exception |
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1640 // or has been stopped before starting. |
| 0 | 1641 // Note: Due to JVM_StopThread we can have pending exceptions already! |
|
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1642 if (!this->has_pending_exception() && |
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1643 !java_lang_Thread::is_stillborn(this->threadObj())) { |
| 4006 | 1644 { |
| 1645 ResourceMark rm(this); | |
| 1646 this->set_native_thread_name(this->get_thread_name()); | |
| 1647 } | |
| 0 | 1648 HandleMark hm(this); |
| 1649 this->entry_point()(this, this); | |
| 1650 } | |
| 1651 | |
| 1652 DTRACE_THREAD_PROBE(stop, this); | |
| 1653 | |
| 1654 this->exit(false); | |
| 1655 delete this; | |
| 1656 } | |
| 1657 | |
| 1658 | |
| 1659 static void ensure_join(JavaThread* thread) { | |
| 1660 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1661 Handle threadObj(thread, thread->threadObj()); | |
| 1662 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1663 ObjectLocker lock(threadObj, thread); | |
| 1664 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1665 thread->clear_pending_exception(); | |
| 1666 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1667 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
|
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1668 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1669 // to complete once we've done the notify_all below |
| 0 | 1670 java_lang_Thread::set_thread(threadObj(), NULL); |
| 1671 lock.notify_all(thread); | |
| 1672 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1673 thread->clear_pending_exception(); | |
| 1674 } | |
| 1675 | |
|
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1676 |
| 0 | 1677 // For any new cleanup additions, please check to see if they need to be applied to |
| 1678 // cleanup_failed_attach_current_thread as well. | |
| 1679 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1680 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1681 if (!InitializeJavaLangSystem) return; | |
| 1682 | |
| 1683 HandleMark hm(this); | |
| 1684 Handle uncaught_exception(this, this->pending_exception()); | |
| 1685 this->clear_pending_exception(); | |
| 1686 Handle threadObj(this, this->threadObj()); | |
| 1687 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1688 | |
| 1689 if (get_thread_profiler() != NULL) { | |
| 1690 get_thread_profiler()->disengage(); | |
| 1691 ResourceMark rm; | |
| 1692 get_thread_profiler()->print(get_thread_name()); | |
| 1693 } | |
| 1694 | |
| 1695 | |
| 1696 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1697 { | |
| 1698 EXCEPTION_MARK; | |
| 1699 | |
| 1700 CLEAR_PENDING_EXCEPTION; | |
| 1701 } | |
| 1702 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1703 // has to be fixed by a runtime query method | |
| 1704 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1705 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1706 // java.lang.Thread.dispatchUncaughtException | |
| 1707 if (uncaught_exception.not_null()) { | |
| 1708 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1709 { | |
| 1710 EXCEPTION_MARK; | |
| 1711 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1712 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1713 // so call ThreadGroup.uncaughtException() | |
| 1714 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1715 CallInfo callinfo; | |
| 1142 | 1716 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1717 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
|
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1718 vmSymbols::dispatchUncaughtException_name(), |
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1719 vmSymbols::throwable_void_signature(), |
| 0 | 1720 KlassHandle(), false, false, THREAD); |
| 1721 CLEAR_PENDING_EXCEPTION; | |
| 1722 methodHandle method = callinfo.selected_method(); | |
| 1723 if (method.not_null()) { | |
| 1724 JavaValue result(T_VOID); | |
| 1725 JavaCalls::call_virtual(&result, | |
| 1726 threadObj, thread_klass, | |
|
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1727 vmSymbols::dispatchUncaughtException_name(), |
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1728 vmSymbols::throwable_void_signature(), |
| 0 | 1729 uncaught_exception, |
| 1730 THREAD); | |
| 1731 } else { | |
| 1142 | 1732 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 1733 JavaValue result(T_VOID); |
| 1734 JavaCalls::call_virtual(&result, | |
| 1735 group, thread_group, | |
|
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1736 vmSymbols::uncaughtException_name(), |
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1737 vmSymbols::thread_throwable_void_signature(), |
| 0 | 1738 threadObj, // Arg 1 |
| 1739 uncaught_exception, // Arg 2 | |
| 1740 THREAD); | |
| 1741 } | |
|
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1742 if (HAS_PENDING_EXCEPTION) { |
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1743 ResourceMark rm(this); |
|
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1744 jio_fprintf(defaultStream::error_stream(), |
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1745 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1746 " in thread \"%s\"\n", |
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1747 Klass::cast(pending_exception()->klass())->external_name(), |
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1748 get_thread_name()); |
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1749 CLEAR_PENDING_EXCEPTION; |
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1750 } |
| 0 | 1751 } |
| 1752 } | |
| 1753 | |
|
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1754 // Called before the java thread exit since we want to read info |
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1755 // from java_lang_Thread object |
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1756 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1757 EVENT_COMMIT(event, |
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1758 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1759 |
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1760 // Call after last event on thread |
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1761 EVENT_THREAD_EXIT(this); |
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1762 |
| 0 | 1763 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
| 1764 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1765 // is deprecated anyhow. | |
| 1766 { int count = 3; | |
| 1767 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1768 EXCEPTION_MARK; | |
| 1769 JavaValue result(T_VOID); | |
| 1142 | 1770 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
| 0 | 1771 JavaCalls::call_virtual(&result, |
| 1772 threadObj, thread_klass, | |
|
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1773 vmSymbols::exit_method_name(), |
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1774 vmSymbols::void_method_signature(), |
| 0 | 1775 THREAD); |
| 1776 CLEAR_PENDING_EXCEPTION; | |
| 1777 } | |
| 1778 } | |
| 1779 | |
| 1780 // notify JVMTI | |
| 1781 if (JvmtiExport::should_post_thread_life()) { | |
| 1782 JvmtiExport::post_thread_end(this); | |
| 1783 } | |
| 1784 | |
| 1785 // We have notified the agents that we are exiting, before we go on, | |
| 1786 // we must check for a pending external suspend request and honor it | |
| 1787 // in order to not surprise the thread that made the suspend request. | |
| 1788 while (true) { | |
| 1789 { | |
| 1790 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1791 if (!is_external_suspend()) { | |
| 1792 set_terminated(_thread_exiting); | |
| 1793 ThreadService::current_thread_exiting(this); | |
| 1794 break; | |
| 1795 } | |
| 1796 // Implied else: | |
| 1797 // Things get a little tricky here. We have a pending external | |
| 1798 // suspend request, but we are holding the SR_lock so we | |
| 1799 // can't just self-suspend. So we temporarily drop the lock | |
| 1800 // and then self-suspend. | |
| 1801 } | |
| 1802 | |
| 1803 ThreadBlockInVM tbivm(this); | |
| 1804 java_suspend_self(); | |
| 1805 | |
| 1806 // We're done with this suspend request, but we have to loop around | |
| 1807 // and check again. Eventually we will get SR_lock without a pending | |
| 1808 // external suspend request and will be able to mark ourselves as | |
| 1809 // exiting. | |
| 1810 } | |
| 1811 // no more external suspends are allowed at this point | |
| 1812 } else { | |
| 1813 // before_exit() has already posted JVMTI THREAD_END events | |
| 1814 } | |
| 1815 | |
| 1816 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1817 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1818 // group should have the destroyed bit set before waiters are notified). | |
| 1819 ensure_join(this); | |
| 1820 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1821 | |
| 1822 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1823 // held by this thread must be released. A detach operation must only | |
| 1824 // get here if there are no Java frames on the stack. Therefore, any | |
| 1825 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1826 // pre-inflated and in the monitor cache. | |
| 1827 // | |
| 1828 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1829 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1830 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1831 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1832 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1833 } | |
| 1834 | |
| 1835 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1836 // is in a consistent state, in case GC happens | |
| 1837 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1838 | |
| 1839 if (active_handles() != NULL) { | |
| 1840 JNIHandleBlock* block = active_handles(); | |
| 1841 set_active_handles(NULL); | |
| 1842 JNIHandleBlock::release_block(block); | |
| 1843 } | |
| 1844 | |
| 1845 if (free_handle_block() != NULL) { | |
| 1846 JNIHandleBlock* block = free_handle_block(); | |
| 1847 set_free_handle_block(NULL); | |
| 1848 JNIHandleBlock::release_block(block); | |
| 1849 } | |
| 1850 | |
| 1851 // These have to be removed while this is still a valid thread. | |
| 1852 remove_stack_guard_pages(); | |
| 1853 | |
| 1854 if (UseTLAB) { | |
| 1855 tlab().make_parsable(true); // retire TLAB | |
| 1856 } | |
| 1857 | |
|
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1858 if (JvmtiEnv::environments_might_exist()) { |
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1859 JvmtiExport::cleanup_thread(this); |
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1860 } |
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1861 |
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1862 #ifndef SERIALGC |
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1863 // We must flush G1-related buffers before removing a thread from |
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1864 // the list of active threads. |
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1865 if (UseG1GC) { |
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1866 flush_barrier_queues(); |
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1867 } |
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1868 #endif |
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1869 |
| 0 | 1870 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1871 Threads::remove(this); | |
| 1872 } | |
| 1873 | |
|
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1874 #ifndef SERIALGC |
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1875 // Flush G1-related queues. |
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1876 void JavaThread::flush_barrier_queues() { |
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1877 satb_mark_queue().flush(); |
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1878 dirty_card_queue().flush(); |
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1879 } |
|
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1880 |
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1881 void JavaThread::initialize_queues() { |
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1882 assert(!SafepointSynchronize::is_at_safepoint(), |
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1883 "we should not be at a safepoint"); |
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1884 |
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1885 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1886 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1887 // The SATB queue should have been constructed with its active |
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1888 // field set to false. |
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1889 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1890 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1891 // If we are creating the thread during a marking cycle, we should |
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1892 // set the active field of the SATB queue to true. |
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1893 if (satb_queue_set.is_active()) { |
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1894 satb_queue.set_active(true); |
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1895 } |
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1896 |
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1897 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1898 // The dirty card queue should have been constructed with its |
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1899 // active field set to true. |
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1900 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1901 } |
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1902 #endif // !SERIALGC |
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1903 |
| 0 | 1904 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1905 if (get_thread_profiler() != NULL) { |
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1906 get_thread_profiler()->disengage(); |
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1907 ResourceMark rm; |
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1908 get_thread_profiler()->print(get_thread_name()); |
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1909 } |
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1910 |
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1911 if (active_handles() != NULL) { |
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1912 JNIHandleBlock* block = active_handles(); |
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1913 set_active_handles(NULL); |
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1914 JNIHandleBlock::release_block(block); |
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1915 } |
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1916 |
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1917 if (free_handle_block() != NULL) { |
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1918 JNIHandleBlock* block = free_handle_block(); |
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1919 set_free_handle_block(NULL); |
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1920 JNIHandleBlock::release_block(block); |
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1921 } |
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1922 |
|
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1923 // These have to be removed while this is still a valid thread. |
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1924 remove_stack_guard_pages(); |
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1925 |
|
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1926 if (UseTLAB) { |
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1927 tlab().make_parsable(true); // retire TLAB, if any |
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1928 } |
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1929 |
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1930 #ifndef SERIALGC |
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1931 if (UseG1GC) { |
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1932 flush_barrier_queues(); |
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1933 } |
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1934 #endif |
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1935 |
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1936 Threads::remove(this); |
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1937 delete this; |
| 0 | 1938 } |
| 1939 | |
| 1940 | |
|
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1941 |
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1942 |
| 0 | 1943 JavaThread* JavaThread::active() { |
| 1944 Thread* thread = ThreadLocalStorage::thread(); | |
| 1945 assert(thread != NULL, "just checking"); | |
| 1946 if (thread->is_Java_thread()) { | |
| 1947 return (JavaThread*) thread; | |
| 1948 } else { | |
| 1949 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1950 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1951 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1952 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1953 return ret; | |
| 1954 } | |
| 1955 } | |
| 1956 | |
| 1957 bool JavaThread::is_lock_owned(address adr) const { | |
|
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1958 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1959 |
| 1960 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1961 if (chunk->contains(adr)) return true; | |
| 1962 } | |
| 1963 | |
| 1964 return false; | |
| 1965 } | |
| 1966 | |
| 1967 | |
| 1968 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1969 chunk->set_next(monitor_chunks()); | |
| 1970 set_monitor_chunks(chunk); | |
| 1971 } | |
| 1972 | |
| 1973 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1974 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1975 if (monitor_chunks() == chunk) { | |
| 1976 set_monitor_chunks(chunk->next()); | |
| 1977 } else { | |
| 1978 MonitorChunk* prev = monitor_chunks(); | |
| 1979 while (prev->next() != chunk) prev = prev->next(); | |
| 1980 prev->set_next(chunk->next()); | |
| 1981 } | |
| 1982 } | |
| 1983 | |
| 1984 // JVM support. | |
| 1985 | |
| 1986 // Note: this function shouldn't block if it's called in | |
| 1987 // _thread_in_native_trans state (such as from | |
| 1988 // check_special_condition_for_native_trans()). | |
| 1989 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1990 | |
| 1991 if (has_last_Java_frame() && has_async_condition()) { | |
| 1992 // If we are at a polling page safepoint (not a poll return) | |
| 1993 // then we must defer async exception because live registers | |
| 1994 // will be clobbered by the exception path. Poll return is | |
| 1995 // ok because the call we a returning from already collides | |
| 1996 // with exception handling registers and so there is no issue. | |
| 1997 // (The exception handling path kills call result registers but | |
| 1998 // this is ok since the exception kills the result anyway). | |
| 1999 | |
| 2000 if (is_at_poll_safepoint()) { | |
| 2001 // if the code we are returning to has deoptimized we must defer | |
| 2002 // the exception otherwise live registers get clobbered on the | |
| 2003 // exception path before deoptimization is able to retrieve them. | |
| 2004 // | |
| 2005 RegisterMap map(this, false); | |
| 2006 frame caller_fr = last_frame().sender(&map); | |
| 2007 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 2008 if (caller_fr.is_deoptimized_frame()) { | |
| 2009 if (TraceExceptions) { | |
| 2010 ResourceMark rm; | |
| 2011 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 2012 } | |
| 2013 return; | |
| 2014 } | |
| 2015 } | |
| 2016 } | |
| 2017 | |
| 2018 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 2019 if (condition == _no_async_condition) { | |
| 2020 // Conditions have changed since has_special_runtime_exit_condition() | |
| 2021 // was called: | |
| 2022 // - if we were here only because of an external suspend request, | |
| 2023 // then that was taken care of above (or cancelled) so we are done | |
| 2024 // - if we were here because of another async request, then it has | |
| 2025 // been cleared between the has_special_runtime_exit_condition() | |
| 2026 // and now so again we are done | |
| 2027 return; | |
| 2028 } | |
| 2029 | |
| 2030 // Check for pending async. exception | |
| 2031 if (_pending_async_exception != NULL) { | |
| 2032 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1142 | 2033 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2034 |
| 2035 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 2036 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 2037 | |
| 2038 if (TraceExceptions) { | |
| 2039 ResourceMark rm; | |
| 2040 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 2041 if (has_last_Java_frame() ) { | |
| 2042 frame f = last_frame(); | |
| 2043 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 2044 } | |
|
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2045 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2046 } |
| 2047 _pending_async_exception = NULL; | |
| 2048 clear_has_async_exception(); | |
| 2049 } | |
| 2050 } | |
| 2051 | |
| 2052 if (check_unsafe_error && | |
| 2053 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 2054 condition = _no_async_condition; // done | |
| 2055 switch (thread_state()) { | |
| 2056 case _thread_in_vm: | |
| 2057 { | |
| 2058 JavaThread* THREAD = this; | |
| 2059 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2060 } | |
| 2061 case _thread_in_native: | |
| 2062 { | |
| 2063 ThreadInVMfromNative tiv(this); | |
| 2064 JavaThread* THREAD = this; | |
| 2065 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 2066 } | |
| 2067 case _thread_in_Java: | |
| 2068 { | |
| 2069 ThreadInVMfromJava tiv(this); | |
| 2070 JavaThread* THREAD = this; | |
| 2071 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 2072 } | |
| 2073 default: | |
| 2074 ShouldNotReachHere(); | |
| 2075 } | |
| 2076 } | |
| 2077 | |
| 2078 assert(condition == _no_async_condition || has_pending_exception() || | |
| 2079 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 2080 "must have handled the async condition, if no exception"); | |
| 2081 } | |
| 2082 | |
| 2083 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 2084 // | |
| 2085 // Check for pending external suspend. Internal suspend requests do | |
| 2086 // not use handle_special_runtime_exit_condition(). | |
| 2087 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2088 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2089 // threads could call into the VM with another thread's JNIEnv so we | |
| 2090 // can be here operating on behalf of a suspended thread (4432884). | |
| 2091 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 2092 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 2093 // | |
| 2094 // Because thread is external suspended the safepoint code will count | |
| 2095 // thread as at a safepoint. This can be odd because we can be here | |
| 2096 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 2097 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 2098 // before calling java_suspend_self like all other callers of it but | |
| 2099 // we must then observe proper safepoint protocol. (We can't leave | |
| 2100 // _thread_blocked with a safepoint in progress). However we can be | |
| 2101 // here as _thread_in_native_trans so we can't use a normal transition | |
| 2102 // constructor/destructor pair because they assert on that type of | |
| 2103 // transition. We could do something like: | |
| 2104 // | |
| 2105 // JavaThreadState state = thread_state(); | |
| 2106 // set_thread_state(_thread_in_vm); | |
| 2107 // { | |
| 2108 // ThreadBlockInVM tbivm(this); | |
| 2109 // java_suspend_self() | |
| 2110 // } | |
| 2111 // set_thread_state(_thread_in_vm_trans); | |
| 2112 // if (safepoint) block; | |
| 2113 // set_thread_state(state); | |
| 2114 // | |
| 2115 // but that is pretty messy. Instead we just go with the way the | |
| 2116 // code has worked before and note that this is the only path to | |
| 2117 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 2118 // mode. | |
| 2119 | |
| 2120 frame_anchor()->make_walkable(this); | |
| 2121 java_suspend_self(); | |
| 2122 | |
| 2123 // We might be here for reasons in addition to the self-suspend request | |
| 2124 // so check for other async requests. | |
| 2125 } | |
| 2126 | |
| 2127 if (check_asyncs) { | |
| 2128 check_and_handle_async_exceptions(); | |
| 2129 } | |
| 2130 } | |
| 2131 | |
| 2132 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 2133 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 2134 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 2135 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 2136 | |
| 2137 // Do not throw asynchronous exceptions against the compiler thread | |
| 2138 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 2139 if (is_Compiler_thread()) return; | |
| 2140 | |
| 2141 { | |
| 2142 // Actually throw the Throwable against the target Thread - however | |
| 2143 // only if there is no thread death exception installed already. | |
| 1142 | 2144 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
| 0 | 2145 // If the topmost frame is a runtime stub, then we are calling into |
| 2146 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 2147 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 2148 // may not be valid | |
| 2149 if (has_last_Java_frame()) { | |
| 2150 frame f = last_frame(); | |
| 2151 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 2152 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2153 RegisterMap reg_map(this, UseBiasedLocking); | |
| 2154 frame compiled_frame = f.sender(®_map); | |
| 2155 if (compiled_frame.can_be_deoptimized()) { | |
| 2156 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 2157 } | |
| 2158 } | |
| 2159 } | |
| 2160 | |
| 2161 // Set async. pending exception in thread. | |
| 2162 set_pending_async_exception(java_throwable); | |
| 2163 | |
| 2164 if (TraceExceptions) { | |
| 2165 ResourceMark rm; | |
|
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2166 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
| 0 | 2167 } |
| 2168 // for AbortVMOnException flag | |
|
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2169 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
| 0 | 2170 } |
| 2171 } | |
| 2172 | |
| 2173 | |
| 2174 // Interrupt thread so it will wake up from a potential wait() | |
| 2175 Thread::interrupt(this); | |
| 2176 } | |
| 2177 | |
| 2178 // External suspension mechanism. | |
| 2179 // | |
| 2180 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 2181 // to any VM_locks and it is at a transition | |
| 2182 // Self-suspension will happen on the transition out of the vm. | |
| 2183 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 2184 // | |
| 2185 // Guarantees on return: | |
| 2186 // + Target thread will not execute any new bytecode (that's why we need to | |
| 2187 // force a safepoint) | |
| 2188 // + Target thread will not enter any new monitors | |
| 2189 // | |
| 2190 void JavaThread::java_suspend() { | |
| 2191 { MutexLocker mu(Threads_lock); | |
| 2192 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 2193 return; | |
| 2194 } | |
| 2195 } | |
| 2196 | |
| 2197 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2198 if (!is_external_suspend()) { | |
| 2199 // a racing resume has cancelled us; bail out now | |
| 2200 return; | |
| 2201 } | |
| 2202 | |
| 2203 // suspend is done | |
| 2204 uint32_t debug_bits = 0; | |
| 2205 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 2206 // SR_lock to allow the thread to reach a stable thread state if | |
| 2207 // it is currently in a transient thread state. | |
| 2208 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 2209 SuspendRetryDelay, &debug_bits) ) { | |
| 2210 return; | |
| 2211 } | |
| 2212 } | |
| 2213 | |
| 2214 VM_ForceSafepoint vm_suspend; | |
| 2215 VMThread::execute(&vm_suspend); | |
| 2216 } | |
| 2217 | |
| 2218 // Part II of external suspension. | |
| 2219 // A JavaThread self suspends when it detects a pending external suspend | |
| 2220 // request. This is usually on transitions. It is also done in places | |
| 2221 // where continuing to the next transition would surprise the caller, | |
| 2222 // e.g., monitor entry. | |
| 2223 // | |
| 2224 // Returns the number of times that the thread self-suspended. | |
| 2225 // | |
| 2226 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 2227 // thread. java_suspend_self() is the second stage of cooperative | |
| 2228 // suspension for external suspend requests and should only be used | |
| 2229 // to complete an external suspend request. | |
| 2230 // | |
| 2231 int JavaThread::java_suspend_self() { | |
| 2232 int ret = 0; | |
| 2233 | |
| 2234 // we are in the process of exiting so don't suspend | |
| 2235 if (is_exiting()) { | |
| 2236 clear_external_suspend(); | |
| 2237 return ret; | |
| 2238 } | |
| 2239 | |
| 2240 assert(_anchor.walkable() || | |
| 2241 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 2242 "must have walkable stack"); | |
| 2243 | |
| 2244 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2245 | |
| 979 | 2246 assert(!this->is_ext_suspended(), |
| 0 | 2247 "a thread trying to self-suspend should not already be suspended"); |
| 2248 | |
| 2249 if (this->is_suspend_equivalent()) { | |
| 2250 // If we are self-suspending as a result of the lifting of a | |
| 2251 // suspend equivalent condition, then the suspend_equivalent | |
| 2252 // flag is not cleared until we set the ext_suspended flag so | |
| 2253 // that wait_for_ext_suspend_completion() returns consistent | |
| 2254 // results. | |
| 2255 this->clear_suspend_equivalent(); | |
| 2256 } | |
| 2257 | |
| 2258 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 2259 // above. Or another external suspend request could be waiting for us | |
| 2260 // by the time we return from SR_lock()->wait(). The thread | |
| 2261 // that requested the suspension may already be trying to walk our | |
| 2262 // stack and if we return now, we can change the stack out from under | |
| 2263 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 2264 // to crash. We stay self-suspended until there are no more pending | |
| 2265 // external suspend requests. | |
| 2266 while (is_external_suspend()) { | |
| 2267 ret++; | |
| 2268 this->set_ext_suspended(); | |
| 2269 | |
| 2270 // _ext_suspended flag is cleared by java_resume() | |
| 2271 while (is_ext_suspended()) { | |
| 2272 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 2273 } | |
| 2274 } | |
| 2275 | |
| 2276 return ret; | |
| 2277 } | |
| 2278 | |
| 2279 #ifdef ASSERT | |
| 2280 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 2281 // hence doesn't need protection from concurrent access at this stage | |
| 2282 void JavaThread::verify_not_published() { | |
| 2283 if (!Threads_lock->owned_by_self()) { | |
| 2284 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 2285 assert( !Threads::includes(this), | |
| 2286 "java thread shouldn't have been published yet!"); | |
| 2287 } | |
| 2288 else { | |
| 2289 assert( !Threads::includes(this), | |
| 2290 "java thread shouldn't have been published yet!"); | |
| 2291 } | |
| 2292 } | |
| 2293 #endif | |
| 2294 | |
| 2295 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2296 // progress or when _suspend_flags is non-zero. | |
| 2297 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2298 // block if a safepoint is in progress. | |
| 2299 // Async exception ISN'T checked. | |
| 2300 // Note only the ThreadInVMfromNative transition can call this function | |
| 2301 // directly and when thread state is _thread_in_native_trans | |
| 2302 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2303 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2304 | |
| 2305 JavaThread *curJT = JavaThread::current(); | |
| 2306 bool do_self_suspend = thread->is_external_suspend(); | |
| 2307 | |
| 2308 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2309 | |
| 2310 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2311 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2312 // threads could call into the VM with another thread's JNIEnv so we | |
| 2313 // can be here operating on behalf of a suspended thread (4432884). | |
| 2314 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2315 JavaThreadState state = thread->thread_state(); | |
| 2316 | |
| 2317 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2318 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2319 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2320 thread->set_suspend_equivalent(); | |
| 2321 | |
| 2322 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2323 // wait until the thread changes to other thread state. There is no | |
| 2324 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2325 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2326 // too long. Temporarily change the state to _thread_blocked to | |
| 2327 // let the VM thread know that this thread is ready for GC. The problem | |
| 2328 // of changing thread state is that safepoint could happen just after | |
| 2329 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2330 // see the _thread_blocked state. We must check for safepoint | |
| 2331 // after restoring the state and make sure we won't leave while a safepoint | |
| 2332 // is in progress. | |
| 2333 thread->set_thread_state(_thread_blocked); | |
| 2334 thread->java_suspend_self(); | |
| 2335 thread->set_thread_state(state); | |
| 2336 // Make sure new state is seen by VM thread | |
| 2337 if (os::is_MP()) { | |
| 2338 if (UseMembar) { | |
| 2339 // Force a fence between the write above and read below | |
| 2340 OrderAccess::fence(); | |
| 2341 } else { | |
| 2342 // Must use this rather than serialization page in particular on Windows | |
| 2343 InterfaceSupport::serialize_memory(thread); | |
| 2344 } | |
| 2345 } | |
| 2346 } | |
| 2347 | |
| 2348 if (SafepointSynchronize::do_call_back()) { | |
| 2349 // If we are safepointing, then block the caller which may not be | |
| 2350 // the same as the target thread (see above). | |
| 2351 SafepointSynchronize::block(curJT); | |
| 2352 } | |
| 2353 | |
| 2354 if (thread->is_deopt_suspend()) { | |
| 2355 thread->clear_deopt_suspend(); | |
| 2356 RegisterMap map(thread, false); | |
| 2357 frame f = thread->last_frame(); | |
| 2358 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2359 f = f.sender(&map); | |
| 2360 } | |
| 2361 if (f.id() == thread->must_deopt_id()) { | |
| 2362 thread->clear_must_deopt_id(); | |
|
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2363 f.deoptimize(thread); |
| 0 | 2364 } else { |
| 2365 fatal("missed deoptimization!"); | |
| 2366 } | |
| 2367 } | |
| 2368 } | |
| 2369 | |
| 2370 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2371 // progress or when _suspend_flags is non-zero. | |
| 2372 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2373 // block if a safepoint is in progress. | |
| 2374 // Also check for pending async exception (not including unsafe access error). | |
| 2375 // Note only the native==>VM/Java barriers can call this function and when | |
| 2376 // thread state is _thread_in_native_trans. | |
| 2377 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2378 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2379 | |
| 2380 if (thread->has_async_exception()) { | |
| 2381 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2382 // access error since that may block. | |
| 2383 thread->check_and_handle_async_exceptions(false); | |
| 2384 } | |
| 2385 } | |
| 2386 | |
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2387 // This is a variant of the normal |
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2388 // check_special_condition_for_native_trans with slightly different |
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2389 // semantics for use by critical native wrappers. It does all the |
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2390 // normal checks but also performs the transition back into |
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2391 // thread_in_Java state. This is required so that critical natives |
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2392 // can potentially block and perform a GC if they are the last thread |
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2393 // exiting the GC_locker. |
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2394 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2395 check_special_condition_for_native_trans(thread); |
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2396 |
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2397 // Finish the transition |
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2398 thread->set_thread_state(_thread_in_Java); |
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2399 |
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2400 if (thread->do_critical_native_unlock()) { |
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2401 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2402 GC_locker::unlock_critical(thread); |
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2403 thread->clear_critical_native_unlock(); |
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2404 } |
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2405 } |
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2406 |
| 0 | 2407 // We need to guarantee the Threads_lock here, since resumes are not |
| 2408 // allowed during safepoint synchronization | |
| 2409 // Can only resume from an external suspension | |
| 2410 void JavaThread::java_resume() { | |
| 2411 assert_locked_or_safepoint(Threads_lock); | |
| 2412 | |
| 2413 // Sanity check: thread is gone, has started exiting or the thread | |
| 2414 // was not externally suspended. | |
| 2415 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2416 return; | |
| 2417 } | |
| 2418 | |
| 2419 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2420 | |
| 2421 clear_external_suspend(); | |
| 2422 | |
| 2423 if (is_ext_suspended()) { | |
| 2424 clear_ext_suspended(); | |
| 2425 SR_lock()->notify_all(); | |
| 2426 } | |
| 2427 } | |
| 2428 | |
| 2429 void JavaThread::create_stack_guard_pages() { | |
| 2430 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2431 address low_addr = stack_base() - stack_size(); | |
| 2432 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2433 | |
| 2434 int allocate = os::allocate_stack_guard_pages(); | |
| 2435 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2436 | |
|
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2437 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2438 warning("Attempt to allocate stack guard pages failed."); |
| 2439 return; | |
| 2440 } | |
| 2441 | |
| 2442 if (os::guard_memory((char *) low_addr, len)) { | |
| 2443 _stack_guard_state = stack_guard_enabled; | |
| 2444 } else { | |
| 2445 warning("Attempt to protect stack guard pages failed."); | |
| 2446 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2447 warning("Attempt to deallocate stack guard pages failed."); | |
| 2448 } | |
| 2449 } | |
| 2450 } | |
| 2451 | |
| 2452 void JavaThread::remove_stack_guard_pages() { | |
|
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2453 assert(Thread::current() == this, "from different thread"); |
| 0 | 2454 if (_stack_guard_state == stack_guard_unused) return; |
| 2455 address low_addr = stack_base() - stack_size(); | |
| 2456 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2457 | |
| 2458 if (os::allocate_stack_guard_pages()) { | |
|
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2459 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
| 0 | 2460 _stack_guard_state = stack_guard_unused; |
| 2461 } else { | |
| 2462 warning("Attempt to deallocate stack guard pages failed."); | |
| 2463 } | |
| 2464 } else { | |
| 2465 if (_stack_guard_state == stack_guard_unused) return; | |
| 2466 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2467 _stack_guard_state = stack_guard_unused; | |
| 2468 } else { | |
| 2469 warning("Attempt to unprotect stack guard pages failed."); | |
| 2470 } | |
| 2471 } | |
| 2472 } | |
| 2473 | |
| 2474 void JavaThread::enable_stack_yellow_zone() { | |
| 2475 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2476 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2477 | |
| 2478 // The base notation is from the stacks point of view, growing downward. | |
| 2479 // We need to adjust it to work correctly with guard_memory() | |
| 2480 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2481 | |
| 2482 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2483 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2484 | |
| 2485 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2486 _stack_guard_state = stack_guard_enabled; | |
| 2487 } else { | |
| 2488 warning("Attempt to guard stack yellow zone failed."); | |
| 2489 } | |
| 2490 enable_register_stack_guard(); | |
| 2491 } | |
| 2492 | |
| 2493 void JavaThread::disable_stack_yellow_zone() { | |
| 2494 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2495 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2496 | |
| 2497 // Simply return if called for a thread that does not use guard pages. | |
| 2498 if (_stack_guard_state == stack_guard_unused) return; | |
| 2499 | |
| 2500 // The base notation is from the stacks point of view, growing downward. | |
| 2501 // We need to adjust it to work correctly with guard_memory() | |
| 2502 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2503 | |
| 2504 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2505 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2506 } else { | |
| 2507 warning("Attempt to unguard stack yellow zone failed."); | |
| 2508 } | |
| 2509 disable_register_stack_guard(); | |
| 2510 } | |
| 2511 | |
| 2512 void JavaThread::enable_stack_red_zone() { | |
| 2513 // The base notation is from the stacks point of view, growing downward. | |
| 2514 // We need to adjust it to work correctly with guard_memory() | |
| 2515 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2516 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2517 | |
| 2518 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2519 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2520 | |
| 2521 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2522 warning("Attempt to guard stack red zone failed."); | |
| 2523 } | |
| 2524 } | |
| 2525 | |
| 2526 void JavaThread::disable_stack_red_zone() { | |
| 2527 // The base notation is from the stacks point of view, growing downward. | |
| 2528 // We need to adjust it to work correctly with guard_memory() | |
| 2529 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2530 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2531 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2532 warning("Attempt to unguard stack red zone failed."); | |
| 2533 } | |
| 2534 } | |
| 2535 | |
| 2536 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2537 // ignore is there is no stack | |
| 2538 if (!has_last_Java_frame()) return; | |
| 2539 // traverse the stack frames. Starts from top frame. | |
| 2540 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2541 frame* fr = fst.current(); | |
| 2542 f(fr, fst.register_map()); | |
| 2543 } | |
| 2544 } | |
| 2545 | |
| 2546 | |
| 2547 #ifndef PRODUCT | |
| 2548 // Deoptimization | |
| 2549 // Function for testing deoptimization | |
| 2550 void JavaThread::deoptimize() { | |
| 2551 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2552 StackFrameStream fst(this, UseBiasedLocking); | |
| 2553 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2554 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2555 // Iterate over all frames in the thread and deoptimize | |
| 2556 for(; !fst.is_done(); fst.next()) { | |
| 2557 if(fst.current()->can_be_deoptimized()) { | |
| 2558 | |
| 2559 if (only_at) { | |
| 2560 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2561 // consists of comma or carriage return separated numbers so | |
| 2562 // search for the current bci in that string. | |
| 2563 address pc = fst.current()->pc(); | |
| 2564 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2565 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2566 char buffer[8]; | |
| 2567 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2568 size_t len = strlen(buffer); | |
| 2569 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2570 while (found != NULL) { | |
| 2571 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2572 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2573 // Check that the bci found is bracketed by terminators. | |
| 2574 break; | |
| 2575 } | |
| 2576 found = strstr(found + 1, buffer); | |
| 2577 } | |
| 2578 if (!found) { | |
| 2579 continue; | |
| 2580 } | |
| 2581 } | |
| 2582 | |
| 2583 if (DebugDeoptimization && !deopt) { | |
| 2584 deopt = true; // One-time only print before deopt | |
| 2585 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2586 trace_frames(); | |
| 2587 trace_stack(); | |
| 2588 } | |
| 2589 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2590 } | |
| 2591 } | |
| 2592 | |
| 2593 if (DebugDeoptimization && deopt) { | |
| 2594 tty->print_cr("[AFTER Deoptimization]"); | |
| 2595 trace_frames(); | |
| 2596 } | |
| 2597 } | |
| 2598 | |
| 2599 | |
| 2600 // Make zombies | |
| 2601 void JavaThread::make_zombies() { | |
| 2602 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2603 if (fst.current()->can_be_deoptimized()) { | |
| 2604 // it is a Java nmethod | |
| 2605 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2606 nm->make_not_entrant(); | |
| 2607 } | |
| 2608 } | |
| 2609 } | |
| 2610 #endif // PRODUCT | |
| 2611 | |
| 2612 | |
| 2613 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2614 if (!has_last_Java_frame()) return; | |
| 2615 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2616 StackFrameStream fst(this, UseBiasedLocking); | |
| 2617 for(; !fst.is_done(); fst.next()) { | |
| 2618 if (fst.current()->should_be_deoptimized()) { | |
| 6843 | 2619 if (LogCompilation && xtty != NULL) { |
| 2620 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
| 2621 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
| 2622 this->name(), nm != NULL ? nm->compile_id() : -1); | |
| 2623 } | |
| 2624 | |
| 0 | 2625 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
| 2626 } | |
| 2627 } | |
| 2628 } | |
| 2629 | |
| 2630 | |
| 2631 // GC support | |
| 2632 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2633 | |
| 2634 void JavaThread::gc_epilogue() { | |
| 2635 frames_do(frame_gc_epilogue); | |
| 2636 } | |
| 2637 | |
| 2638 | |
| 2639 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2640 | |
| 2641 void JavaThread::gc_prologue() { | |
| 2642 frames_do(frame_gc_prologue); | |
| 2643 } | |
| 2644 | |
|
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2645 // If the caller is a NamedThread, then remember, in the current scope, |
|
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2646 // the given JavaThread in its _processed_thread field. |
|
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|
2647 class RememberProcessedThread: public StackObj { |
|
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|
2648 NamedThread* _cur_thr; |
|
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|
2649 public: |
|
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|
2650 RememberProcessedThread(JavaThread* jthr) { |
|
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2651 Thread* thread = Thread::current(); |
|
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|
2652 if (thread->is_Named_thread()) { |
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2653 _cur_thr = (NamedThread *)thread; |
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2654 _cur_thr->set_processed_thread(jthr); |
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|
2655 } else { |
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|
2656 _cur_thr = NULL; |
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|
2657 } |
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|
2658 } |
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|
2659 |
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|
2660 ~RememberProcessedThread() { |
|
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|
2661 if (_cur_thr) { |
|
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|
2662 _cur_thr->set_processed_thread(NULL); |
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|
2663 } |
|
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|
2664 } |
|
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|
2665 }; |
| 0 | 2666 |
|
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|
2667 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 1166 | 2668 // Verify that the deferred card marks have been flushed. |
| 2669 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
|
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2670 |
| 0 | 2671 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2672 // since there may be more than one thread using each ThreadProfiler. | |
| 2673 | |
| 2674 // Traverse the GCHandles | |
|
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|
2675 Thread::oops_do(f, cf); |
| 0 | 2676 |
| 2677 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2678 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2679 | |
| 2680 if (has_last_Java_frame()) { | |
|
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2681 // Record JavaThread to GC thread |
|
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|
2682 RememberProcessedThread rpt(this); |
| 0 | 2683 |
| 2684 // Traverse the privileged stack | |
| 2685 if (_privileged_stack_top != NULL) { | |
| 2686 _privileged_stack_top->oops_do(f); | |
| 2687 } | |
| 2688 | |
| 2689 // traverse the registered growable array | |
| 2690 if (_array_for_gc != NULL) { | |
| 2691 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2692 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2693 } | |
| 2694 } | |
| 2695 | |
| 2696 // Traverse the monitor chunks | |
| 2697 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2698 chunk->oops_do(f); | |
| 2699 } | |
| 2700 | |
| 2701 // Traverse the execution stack | |
| 2702 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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|
2703 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2704 } |
| 2705 } | |
| 2706 | |
| 2707 // callee_target is never live across a gc point so NULL it here should | |
| 2708 // it still contain a methdOop. | |
| 2709 | |
| 2710 set_callee_target(NULL); | |
| 2711 | |
| 2712 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2713 // If we have deferred set_locals there might be oops waiting to be | |
| 2714 // written | |
| 2715 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2716 if (list != NULL) { | |
| 2717 for (int i = 0; i < list->length(); i++) { | |
| 2718 list->at(i)->oops_do(f); | |
| 2719 } | |
| 2720 } | |
| 2721 | |
| 2722 // Traverse instance variables at the end since the GC may be moving things | |
| 2723 // around using this function | |
| 2724 f->do_oop((oop*) &_threadObj); | |
| 2725 f->do_oop((oop*) &_vm_result); | |
| 2726 f->do_oop((oop*) &_exception_oop); | |
| 2727 f->do_oop((oop*) &_pending_async_exception); | |
| 2728 | |
| 2729 if (jvmti_thread_state() != NULL) { | |
| 2730 jvmti_thread_state()->oops_do(f); | |
| 2731 } | |
| 2732 } | |
| 2733 | |
|
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2734 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
|
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2735 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2736 |
| 2737 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2738 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2739 | |
| 2740 if (has_last_Java_frame()) { | |
| 2741 // Traverse the execution stack | |
| 2742 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
|
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2743 fst.current()->nmethods_do(cf); |
| 0 | 2744 } |
| 2745 } | |
| 2746 } | |
| 2747 | |
|
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2748 void JavaThread::metadata_do(void f(Metadata*)) { |
|
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|
2749 Thread::metadata_do(f); |
|
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2750 if (has_last_Java_frame()) { |
|
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|
2751 // Traverse the execution stack to call f() on the methods in the stack |
|
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|
2752 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
|
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|
2753 fst.current()->metadata_do(f); |
|
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|
2754 } |
|
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|
2755 } else if (is_Compiler_thread()) { |
|
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2756 // need to walk ciMetadata in current compile tasks to keep alive. |
|
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|
2757 CompilerThread* ct = (CompilerThread*)this; |
|
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|
2758 if (ct->env() != NULL) { |
|
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|
2759 ct->env()->metadata_do(f); |
|
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|
2760 } |
|
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|
2761 } |
|
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|
2762 } |
|
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|
2763 |
| 0 | 2764 // Printing |
| 2765 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2766 switch (_thread_state) { | |
| 2767 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2768 case _thread_new: return "_thread_new"; | |
| 2769 case _thread_new_trans: return "_thread_new_trans"; | |
| 2770 case _thread_in_native: return "_thread_in_native"; | |
| 2771 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2772 case _thread_in_vm: return "_thread_in_vm"; | |
| 2773 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2774 case _thread_in_Java: return "_thread_in_Java"; | |
| 2775 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2776 case _thread_blocked: return "_thread_blocked"; | |
| 2777 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2778 default: return "unknown thread state"; | |
| 2779 } | |
| 2780 } | |
| 2781 | |
| 2782 #ifndef PRODUCT | |
| 2783 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2784 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2785 }; | |
| 2786 void JavaThread::print_thread_state() const { | |
| 2787 print_thread_state_on(tty); | |
| 2788 }; | |
| 2789 #endif // PRODUCT | |
| 2790 | |
| 2791 // Called by Threads::print() for VM_PrintThreads operation | |
| 2792 void JavaThread::print_on(outputStream *st) const { | |
| 2793 st->print("\"%s\" ", get_thread_name()); | |
| 2794 oop thread_oop = threadObj(); | |
| 6766 | 2795 if (thread_oop != NULL) { |
| 2796 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
| 2797 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2798 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
| 2799 } | |
| 0 | 2800 Thread::print_on(st); |
| 2801 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
|
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669
diff
changeset
|
2802 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2803 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2804 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2805 } | |
| 2806 #ifndef PRODUCT | |
| 2807 print_thread_state_on(st); | |
| 2808 _safepoint_state->print_on(st); | |
| 2809 #endif // PRODUCT | |
| 2810 } | |
| 2811 | |
| 2812 // Called by fatal error handler. The difference between this and | |
| 2813 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2814 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2815 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2816 oop thread_obj = threadObj(); | |
| 2817 if (thread_obj != NULL) { | |
| 2818 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2819 } | |
| 2820 st->print(" ["); | |
| 2821 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2822 if (osthread()) { | |
| 2823 st->print(", id=%d", osthread()->thread_id()); | |
| 2824 } | |
| 2825 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2826 _stack_base - _stack_size, _stack_base); | |
| 2827 st->print("]"); | |
| 2828 return; | |
| 2829 } | |
| 2830 | |
| 2831 // Verification | |
| 2832 | |
| 2833 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2834 | |
| 2835 void JavaThread::verify() { | |
| 2836 // Verify oops in the thread. | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
2837 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2838 |
| 2839 // Verify the stack frames. | |
| 2840 frames_do(frame_verify); | |
| 2841 } | |
| 2842 | |
| 2843 // CR 6300358 (sub-CR 2137150) | |
| 2844 // Most callers of this method assume that it can't return NULL but a | |
| 2845 // thread may not have a name whilst it is in the process of attaching to | |
| 2846 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2847 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2848 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2849 // for such that this method never returns NULL. | |
| 2850 const char* JavaThread::get_thread_name() const { | |
| 2851 #ifdef ASSERT | |
| 2852 // early safepoints can hit while current thread does not yet have TLS | |
| 2853 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2854 Thread *cur = Thread::current(); | |
| 2855 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2856 // Current JavaThreads are allowed to get their own name without | |
| 2857 // the Threads_lock. | |
| 2858 assert_locked_or_safepoint(Threads_lock); | |
| 2859 } | |
| 2860 } | |
| 2861 #endif // ASSERT | |
| 2862 return get_thread_name_string(); | |
| 2863 } | |
| 2864 | |
| 2865 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2866 // descriptive string if there is no set name | |
| 2867 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2868 const char* name_str; | |
| 2869 oop thread_obj = threadObj(); | |
| 2870 if (thread_obj != NULL) { | |
| 2871 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2872 if (name != NULL) { | |
| 2873 if (buf == NULL) { | |
| 2874 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2875 } | |
| 2876 else { | |
| 2877 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2878 } | |
| 2879 } | |
| 4006 | 2880 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
| 0 | 2881 name_str = "<no-name - thread is attaching>"; |
| 2882 } | |
| 2883 else { | |
| 2884 name_str = Thread::name(); | |
| 2885 } | |
| 2886 } | |
| 2887 else { | |
| 2888 name_str = Thread::name(); | |
| 2889 } | |
| 2890 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2891 return name_str; | |
| 2892 } | |
| 2893 | |
| 2894 | |
| 2895 const char* JavaThread::get_threadgroup_name() const { | |
| 2896 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2897 oop thread_obj = threadObj(); | |
| 2898 if (thread_obj != NULL) { | |
| 2899 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2900 if (thread_group != NULL) { | |
| 2901 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2902 // ThreadGroup.name can be null | |
| 2903 if (name != NULL) { | |
| 2904 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2905 return str; | |
| 2906 } | |
| 2907 } | |
| 2908 } | |
| 2909 return NULL; | |
| 2910 } | |
| 2911 | |
| 2912 const char* JavaThread::get_parent_name() const { | |
| 2913 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2914 oop thread_obj = threadObj(); | |
| 2915 if (thread_obj != NULL) { | |
| 2916 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2917 if (thread_group != NULL) { | |
| 2918 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2919 if (parent != NULL) { | |
| 2920 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2921 // ThreadGroup.name can be null | |
| 2922 if (name != NULL) { | |
| 2923 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2924 return str; | |
| 2925 } | |
| 2926 } | |
| 2927 } | |
| 2928 } | |
| 2929 return NULL; | |
| 2930 } | |
| 2931 | |
| 2932 ThreadPriority JavaThread::java_priority() const { | |
| 2933 oop thr_oop = threadObj(); | |
| 2934 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2935 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2936 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2937 return priority; | |
| 2938 } | |
| 2939 | |
| 2940 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2941 | |
| 2942 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2943 // Link Java Thread object <-> C++ Thread | |
| 2944 | |
| 2945 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2946 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2947 // be used to pass the C++ thread object to other methods. | |
| 2948 | |
| 2949 // Set the Java level thread object (jthread) field of the | |
| 2950 // new thread (a JavaThread *) to C++ thread object using the | |
| 2951 // "thread_oop" handle. | |
| 2952 | |
| 2953 // Set the thread field (a JavaThread *) of the | |
| 2954 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2955 | |
| 2956 Handle thread_oop(Thread::current(), | |
| 2957 JNIHandles::resolve_non_null(jni_thread)); | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2958 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
| 0 | 2959 "must be initialized"); |
| 2960 set_threadObj(thread_oop()); | |
| 2961 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2962 | |
| 2963 if (prio == NoPriority) { | |
| 2964 prio = java_lang_Thread::priority(thread_oop()); | |
| 2965 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2966 } | |
| 2967 | |
| 2968 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2969 Thread::set_priority(this, prio); | |
| 2970 | |
| 2971 // Add the new thread to the Threads list and set it in motion. | |
| 2972 // We must have threads lock in order to call Threads::add. | |
| 2973 // It is crucial that we do not block before the thread is | |
| 2974 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2975 // will not be visited by GC. | |
| 2976 Threads::add(this); | |
| 2977 } | |
| 2978 | |
| 2979 oop JavaThread::current_park_blocker() { | |
| 2980 // Support for JSR-166 locks | |
| 2981 oop thread_oop = threadObj(); | |
| 242 | 2982 if (thread_oop != NULL && |
| 2983 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2984 return java_lang_Thread::park_blocker(thread_oop); |
| 2985 } | |
| 2986 return NULL; | |
| 2987 } | |
| 2988 | |
| 2989 | |
| 2990 void JavaThread::print_stack_on(outputStream* st) { | |
| 2991 if (!has_last_Java_frame()) return; | |
| 2992 ResourceMark rm; | |
| 2993 HandleMark hm; | |
| 2994 | |
| 2995 RegisterMap reg_map(this); | |
| 2996 vframe* start_vf = last_java_vframe(®_map); | |
| 2997 int count = 0; | |
| 2998 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2999 if (f->is_java_frame()) { | |
| 3000 javaVFrame* jvf = javaVFrame::cast(f); | |
| 3001 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 3002 | |
| 3003 // Print out lock information | |
| 3004 if (JavaMonitorsInStackTrace) { | |
| 3005 jvf->print_lock_info_on(st, count); | |
| 3006 } | |
| 3007 } else { | |
| 3008 // Ignore non-Java frames | |
| 3009 } | |
| 3010 | |
| 3011 // Bail-out case for too deep stacks | |
| 3012 count++; | |
| 3013 if (MaxJavaStackTraceDepth == count) return; | |
| 3014 } | |
| 3015 } | |
| 3016 | |
| 3017 | |
| 3018 // JVMTI PopFrame support | |
| 3019 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 3020 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 3021 if (in_bytes(size_in_bytes) != 0) { | |
| 6197 | 3022 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
| 0 | 3023 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
|
1603
d93949c5bdcc
6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
kvn
parents:
1584
diff
changeset
|
3024 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
| 0 | 3025 } |
| 3026 } | |
| 3027 | |
| 3028 void* JavaThread::popframe_preserved_args() { | |
| 3029 return _popframe_preserved_args; | |
| 3030 } | |
| 3031 | |
| 3032 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 3033 return in_ByteSize(_popframe_preserved_args_size); | |
| 3034 } | |
| 3035 | |
| 3036 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 3037 int sz = in_bytes(popframe_preserved_args_size()); | |
| 3038 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 3039 return in_WordSize(sz / wordSize); | |
| 3040 } | |
| 3041 | |
| 3042 void JavaThread::popframe_free_preserved_args() { | |
| 3043 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 6197 | 3044 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
| 0 | 3045 _popframe_preserved_args = NULL; |
| 3046 _popframe_preserved_args_size = 0; | |
| 3047 } | |
| 3048 | |
| 3049 #ifndef PRODUCT | |
| 3050 | |
| 3051 void JavaThread::trace_frames() { | |
| 3052 tty->print_cr("[Describe stack]"); | |
| 3053 int frame_no = 1; | |
| 3054 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 3055 tty->print(" %d. ", frame_no++); | |
| 3056 fst.current()->print_value_on(tty,this); | |
| 3057 tty->cr(); | |
| 3058 } | |
| 3059 } | |
| 3060 | |
|
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3061 class PrintAndVerifyOopClosure: public OopClosure { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3062 protected: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3063 template <class T> inline void do_oop_work(T* p) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3064 oop obj = oopDesc::load_decode_heap_oop(p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3065 if (obj == NULL) return; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3066 tty->print(INTPTR_FORMAT ": ", p); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3067 if (obj->is_oop_or_null()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3068 if (obj->is_objArray()) { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3069 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
|
3070 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3071 obj->print(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3072 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3073 } else { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3074 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
|
3075 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3076 tty->cr(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3077 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3078 public: |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3079 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
|
3080 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
|
3081 }; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3082 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3083 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3084 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
|
3085 PrintAndVerifyOopClosure print; |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3086 f->print_value(); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3087 f->oops_do(&print, NULL, (RegisterMap*)map); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3088 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3089 |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3090 // 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
|
3091 // 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
|
3092 // 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
|
3093 // oldest. |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3094 void JavaThread::trace_oops() { |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3095 tty->print_cr("[Trace oops]"); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3096 frames_do(oops_print); |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3097 } |
|
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3098 |
| 0 | 3099 |
|
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3100 #ifdef ASSERT |
|
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3101 // 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
|
3102 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
|
3103 ResourceMark rm; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3104 PRESERVE_EXCEPTION_MARK; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3105 FrameValues values; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3106 int frame_no = 0; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3107 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
|
3108 fst.current()->describe(values, ++frame_no); |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3109 if (depth == frame_no) break; |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3110 } |
|
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3111 if (validate_only) { |
|
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|
3112 values.validate(); |
|
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|
3113 } else { |
|
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|
3114 tty->print_cr("[Describe stack layout]"); |
|
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|
3115 values.print(this); |
|
3336
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|
3116 } |
|
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|
3117 } |
|
3388
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|
3118 #endif |
|
3336
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|
3119 |
| 0 | 3120 void JavaThread::trace_stack_from(vframe* start_vf) { |
| 3121 ResourceMark rm; | |
| 3122 int vframe_no = 1; | |
| 3123 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 3124 if (f->is_java_frame()) { | |
| 3125 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 3126 } else { | |
| 3127 f->print(); | |
| 3128 } | |
| 3129 if (vframe_no > StackPrintLimit) { | |
| 3130 tty->print_cr("...<more frames>..."); | |
| 3131 return; | |
| 3132 } | |
| 3133 } | |
| 3134 } | |
| 3135 | |
| 3136 | |
| 3137 void JavaThread::trace_stack() { | |
| 3138 if (!has_last_Java_frame()) return; | |
| 3139 ResourceMark rm; | |
| 3140 HandleMark hm; | |
| 3141 RegisterMap reg_map(this); | |
| 3142 trace_stack_from(last_java_vframe(®_map)); | |
| 3143 } | |
| 3144 | |
| 3145 | |
| 3146 #endif // PRODUCT | |
| 3147 | |
| 3148 | |
| 3149 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 3150 assert(reg_map != NULL, "a map must be given"); | |
| 3151 frame f = last_frame(); | |
| 3152 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 3153 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 3154 } | |
| 3155 return NULL; | |
| 3156 } | |
| 3157 | |
| 3158 | |
|
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|
3159 Klass* JavaThread::security_get_caller_class(int depth) { |
| 0 | 3160 vframeStream vfst(this); |
| 3161 vfst.security_get_caller_frame(depth); | |
| 3162 if (!vfst.at_end()) { | |
| 3163 return vfst.method()->method_holder(); | |
| 3164 } | |
| 3165 return NULL; | |
| 3166 } | |
| 3167 | |
| 3168 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 3169 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 3170 CompileBroker::compiler_thread_loop(); | |
| 3171 } | |
| 3172 | |
| 3173 // Create a CompilerThread | |
| 3174 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 3175 : JavaThread(&compiler_thread_entry) { | |
| 3176 _env = NULL; | |
| 3177 _log = NULL; | |
| 3178 _task = NULL; | |
| 3179 _queue = queue; | |
| 3180 _counters = counters; | |
| 1584 | 3181 _buffer_blob = NULL; |
|
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|
3182 _scanned_nmethod = NULL; |
| 0 | 3183 |
| 3184 #ifndef PRODUCT | |
| 3185 _ideal_graph_printer = NULL; | |
| 3186 #endif | |
| 3187 } | |
| 3188 | |
|
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|
3189 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
|
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|
3190 JavaThread::oops_do(f, cf); |
|
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|
3191 if (_scanned_nmethod != NULL && cf != NULL) { |
|
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|
3192 // Safepoints can occur when the sweeper is scanning an nmethod so |
|
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|
3193 // process it here to make sure it isn't unloaded in the middle of |
|
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|
3194 // a scan. |
|
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|
3195 cf->do_code_blob(_scanned_nmethod); |
|
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|
3196 } |
|
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|
3197 } |
| 0 | 3198 |
| 3199 // ======= Threads ======== | |
| 3200 | |
| 3201 // The Threads class links together all active threads, and provides | |
| 3202 // operations over all threads. It is protected by its own Mutex | |
| 3203 // lock, which is also used in other contexts to protect thread | |
| 3204 // operations from having the thread being operated on from exiting | |
| 3205 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 3206 | |
| 3207 JavaThread* Threads::_thread_list = NULL; | |
| 3208 int Threads::_number_of_threads = 0; | |
| 3209 int Threads::_number_of_non_daemon_threads = 0; | |
| 3210 int Threads::_return_code = 0; | |
| 3211 size_t JavaThread::_stack_size_at_create = 0; | |
|
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|
3212 #ifdef ASSERT |
|
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|
3213 bool Threads::_vm_complete = false; |
|
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|
3214 #endif |
| 0 | 3215 |
| 3216 // All JavaThreads | |
| 3217 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 3218 | |
| 3219 void os_stream(); | |
| 3220 | |
| 3221 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 3222 void Threads::threads_do(ThreadClosure* tc) { | |
| 3223 assert_locked_or_safepoint(Threads_lock); | |
| 3224 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 3225 ALL_JAVA_THREADS(p) { | |
| 3226 tc->do_thread(p); | |
| 3227 } | |
| 3228 // Someday we could have a table or list of all non-JavaThreads. | |
| 3229 // For now, just manually iterate through them. | |
| 3230 tc->do_thread(VMThread::vm_thread()); | |
| 3231 Universe::heap()->gc_threads_do(tc); | |
|
323
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|
3232 WatcherThread *wt = WatcherThread::watcher_thread(); |
|
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|
3233 // Strictly speaking, the following NULL check isn't sufficient to make sure |
|
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|
3234 // the data for WatcherThread is still valid upon being examined. However, |
|
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|
3235 // considering that WatchThread terminates when the VM is on the way to |
|
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|
3236 // exit at safepoint, the chance of the above is extremely small. The right |
|
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|
3237 // way to prevent termination of WatcherThread would be to acquire |
|
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|
3238 // Terminator_lock, but we can't do that without violating the lock rank |
|
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|
3239 // checking in some cases. |
|
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|
3240 if (wt != NULL) |
|
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|
3241 tc->do_thread(wt); |
|
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|
3242 |
| 0 | 3243 // If CompilerThreads ever become non-JavaThreads, add them here |
| 3244 } | |
| 3245 | |
| 3246 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 3247 | |
| 242 | 3248 extern void JDK_Version_init(); |
| 3249 | |
| 0 | 3250 // Check version |
| 3251 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 3252 | |
| 3253 // Initialize the output stream module | |
| 3254 ostream_init(); | |
| 3255 | |
| 3256 // Process java launcher properties. | |
| 3257 Arguments::process_sun_java_launcher_properties(args); | |
| 3258 | |
| 3259 // Initialize the os module before using TLS | |
| 3260 os::init(); | |
| 3261 | |
| 3262 // Initialize system properties. | |
| 3263 Arguments::init_system_properties(); | |
| 3264 | |
| 242 | 3265 // So that JDK version can be used as a discrimintor when parsing arguments |
| 3266 JDK_Version_init(); | |
| 3267 | |
|
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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1731
diff
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|
3268 // Update/Initialize System properties after JDK version number is known |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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1731
diff
changeset
|
3269 Arguments::init_version_specific_system_properties(); |
|
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
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1731
diff
changeset
|
3270 |
| 0 | 3271 // Parse arguments |
| 3272 jint parse_result = Arguments::parse(args); | |
| 3273 if (parse_result != JNI_OK) return parse_result; | |
| 3274 | |
| 3275 if (PauseAtStartup) { | |
| 3276 os::pause(); | |
| 3277 } | |
| 3278 | |
| 4006 | 3279 #ifndef USDT2 |
| 0 | 3280 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
| 4006 | 3281 #else /* USDT2 */ |
| 3282 HOTSPOT_VM_INIT_BEGIN(); | |
| 3283 #endif /* USDT2 */ | |
| 0 | 3284 |
| 3285 // Record VM creation timing statistics | |
| 3286 TraceVmCreationTime create_vm_timer; | |
| 3287 create_vm_timer.start(); | |
| 3288 | |
| 3289 // Timing (must come after argument parsing) | |
| 3290 TraceTime timer("Create VM", TraceStartupTime); | |
| 3291 | |
| 3292 // Initialize the os module after parsing the args | |
| 3293 jint os_init_2_result = os::init_2(); | |
| 3294 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 3295 | |
| 6197 | 3296 // intialize TLS |
| 3297 ThreadLocalStorage::init(); | |
| 3298 | |
| 3299 // Bootstrap native memory tracking, so it can start recording memory | |
| 3300 // activities before worker thread is started. This is the first phase | |
| 3301 // of bootstrapping, VM is currently running in single-thread mode. | |
| 3302 MemTracker::bootstrap_single_thread(); | |
| 3303 | |
| 0 | 3304 // Initialize output stream logging |
| 3305 ostream_init_log(); | |
| 3306 | |
| 3307 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 3308 // Must be before create_vm_init_agents() | |
| 3309 if (Arguments::init_libraries_at_startup()) { | |
| 3310 convert_vm_init_libraries_to_agents(); | |
| 3311 } | |
| 3312 | |
| 3313 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 3314 if (Arguments::init_agents_at_startup()) { | |
| 3315 create_vm_init_agents(); | |
| 3316 } | |
| 3317 | |
| 3318 // Initialize Threads state | |
| 3319 _thread_list = NULL; | |
| 3320 _number_of_threads = 0; | |
| 3321 _number_of_non_daemon_threads = 0; | |
| 3322 | |
| 3323 // Initialize global data structures and create system classes in heap | |
| 3324 vm_init_globals(); | |
| 3325 | |
| 3326 // Attach the main thread to this os thread | |
| 3327 JavaThread* main_thread = new JavaThread(); | |
| 3328 main_thread->set_thread_state(_thread_in_vm); | |
| 3329 // must do this before set_active_handles and initialize_thread_local_storage | |
| 3330 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 3331 // change the stack size recorded here to one based on the java thread | |
| 3332 // stacksize. This adjusted size is what is used to figure the placement | |
| 3333 // of the guard pages. | |
| 3334 main_thread->record_stack_base_and_size(); | |
| 3335 main_thread->initialize_thread_local_storage(); | |
| 3336 | |
| 3337 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 3338 | |
| 3339 if (!main_thread->set_as_starting_thread()) { | |
| 3340 vm_shutdown_during_initialization( | |
| 3341 "Failed necessary internal allocation. Out of swap space"); | |
| 3342 delete main_thread; | |
| 3343 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3344 return JNI_ENOMEM; | |
| 3345 } | |
| 3346 | |
| 3347 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 3348 // crash Linux VM, see notes in os_linux.cpp. | |
| 3349 main_thread->create_stack_guard_pages(); | |
| 3350 | |
| 1878 | 3351 // Initialize Java-Level synchronization subsystem |
| 3352 ObjectMonitor::Initialize() ; | |
| 0 | 3353 |
| 6197 | 3354 // Second phase of bootstrapping, VM is about entering multi-thread mode |
| 3355 MemTracker::bootstrap_multi_thread(); | |
| 3356 | |
| 0 | 3357 // Initialize global modules |
| 3358 jint status = init_globals(); | |
| 3359 if (status != JNI_OK) { | |
| 3360 delete main_thread; | |
| 3361 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 3362 return status; | |
| 3363 } | |
| 3364 | |
|
1681
126ea7725993
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bobv
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1608
diff
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|
3365 // Should be done after the heap is fully created |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3366 main_thread->cache_global_variables(); |
|
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1608
diff
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|
3367 |
| 0 | 3368 HandleMark hm; |
| 3369 | |
| 3370 { MutexLocker mu(Threads_lock); | |
| 3371 Threads::add(main_thread); | |
| 3372 } | |
| 3373 | |
| 3374 // Any JVMTI raw monitors entered in onload will transition into | |
| 3375 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 3376 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 3377 | |
| 3378 if (VerifyBeforeGC && | |
| 3379 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 3380 Universe::heap()->prepare_for_verify(); | |
| 3381 Universe::verify(); // make sure we're starting with a clean slate | |
| 3382 } | |
| 3383 | |
| 6197 | 3384 // Fully start NMT |
| 3385 MemTracker::start(); | |
| 3386 | |
| 0 | 3387 // Create the VMThread |
| 3388 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 3389 VMThread::create(); | |
| 3390 Thread* vmthread = VMThread::vm_thread(); | |
| 3391 | |
| 3392 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 3393 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 3394 | |
| 3395 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 3396 // Monitors can have spurious returns, must always check another state flag | |
| 3397 { | |
| 3398 MutexLocker ml(Notify_lock); | |
| 3399 os::start_thread(vmthread); | |
| 3400 while (vmthread->active_handles() == NULL) { | |
| 3401 Notify_lock->wait(); | |
| 3402 } | |
| 3403 } | |
| 3404 } | |
| 3405 | |
| 3406 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 3407 EXCEPTION_MARK; | |
| 3408 | |
| 3409 // At this point, the Universe is initialized, but we have not executed | |
| 3410 // any byte code. Now is a good time (the only time) to dump out the | |
| 3411 // internal state of the JVM for sharing. | |
| 3412 if (DumpSharedSpaces) { | |
|
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|
3413 MetaspaceShared::preload_and_dump(CHECK_0); |
| 0 | 3414 ShouldNotReachHere(); |
| 3415 } | |
| 3416 | |
| 3417 // Always call even when there are not JVMTI environments yet, since environments | |
| 3418 // may be attached late and JVMTI must track phases of VM execution | |
| 3419 JvmtiExport::enter_start_phase(); | |
| 3420 | |
| 3421 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 3422 JvmtiExport::post_vm_start(); | |
| 3423 | |
| 3424 { | |
| 3425 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 3426 | |
| 3427 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3428 create_vm_init_libraries(); | |
| 3429 } | |
| 3430 | |
| 3431 if (InitializeJavaLangString) { | |
|
2177
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2162
diff
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|
3432 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
| 0 | 3433 } else { |
| 3434 warning("java.lang.String not initialized"); | |
| 3435 } | |
| 3436 | |
|
18
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|
3437 if (AggressiveOpts) { |
|
192
6d13fcb3663f
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diff
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|
3438 { |
|
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diff
changeset
|
3439 // Forcibly initialize java/util/HashMap and mutate the private |
|
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62
diff
changeset
|
3440 // static final "frontCacheEnabled" field before we start creating instances |
|
18
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diff
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|
3441 #ifdef ASSERT |
|
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|
3442 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3443 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
18
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|
3444 #endif |
|
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|
3445 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
|
192
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|
3446 KlassHandle k = KlassHandle(THREAD, k_o); |
|
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diff
changeset
|
3447 guarantee(k.not_null(), "Must find java/util/HashMap"); |
|
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|
3448 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
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|
3449 ik->initialize(CHECK_0); |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3450 fieldDescriptor fd; |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3451 // Possible we might not find this field; if so, don't break |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3452 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2302
diff
changeset
|
3453 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3454 } |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3455 } |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3456 |
|
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3457 if (UseStringCache) { |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3458 // Forcibly initialize java/lang/StringValue and mutate the private |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3459 // static final "stringCacheEnabled" field before we start creating instances |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3460 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3461 // Possible that StringValue isn't present: if so, silently don't break |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3462 if (k_o != NULL) { |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3463 KlassHandle k = KlassHandle(THREAD, k_o); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3464 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3465 ik->initialize(CHECK_0); |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3466 fieldDescriptor fd; |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3467 // Possible we might not find this field: if so, silently don't break |
|
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3468 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2302
diff
changeset
|
3469 k()->java_mirror()->bool_field_put(fd.offset(), true); |
|
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3470 } |
|
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3471 } |
|
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3472 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3473 } |
|
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3474 |
| 0 | 3475 // Initialize java_lang.System (needed before creating the thread) |
| 3476 if (InitializeJavaLangSystem) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3477 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3478 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
| 0 | 3479 Handle thread_group = create_initial_thread_group(CHECK_0); |
| 3480 Universe::set_main_thread_group(thread_group()); | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3481 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
| 0 | 3482 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
| 3483 main_thread->set_threadObj(thread_object); | |
| 3484 // Set thread status to running since main thread has | |
| 3485 // been started and running. | |
| 3486 java_lang_Thread::set_thread_status(thread_object, | |
| 3487 java_lang_Thread::RUNNABLE); | |
| 3488 | |
| 3489 // The VM preresolve methods to these classes. Make sure that get initialized | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3490 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3491 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
| 0 | 3492 // The VM creates & returns objects of this class. Make sure it's initialized. |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3493 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
| 0 | 3494 call_initializeSystemClass(CHECK_0); |
| 6181 | 3495 |
| 3496 // get the Java runtime name after java.lang.System is initialized | |
| 3497 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
|
6921
a1b8cf9cf970
8002078: hs_err_pid file should report full JDK version string
sla
parents:
6882
diff
changeset
|
3498 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); |
| 0 | 3499 } else { |
| 3500 warning("java.lang.System not initialized"); | |
| 3501 } | |
| 3502 | |
| 3503 // an instance of OutOfMemory exception has been allocated earlier | |
| 3504 if (InitializeJavaLangExceptionsErrors) { | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3505 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3506 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3507 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3508 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3509 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3510 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3511 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3512 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
| 0 | 3513 } else { |
| 3514 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3515 warning("java.lang.NullPointerException has not been initialized"); | |
| 3516 warning("java.lang.ClassCastException has not been initialized"); | |
| 3517 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3518 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3519 warning("java.lang.StackOverflowError has not been initialized"); | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3520 warning("java.lang.IllegalArgumentException has not been initialized"); |
| 0 | 3521 } |
|
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3522 } |
| 0 | 3523 |
| 3524 // See : bugid 4211085. | |
| 3525 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3526 // property"java.compiler" and read & write property "java.vm.info". | |
| 3527 // When a security manager is installed through the command line | |
| 3528 // option "-Djava.security.manager", the above properties are not | |
| 3529 // readable and the static initializer for java.lang.Compiler fails | |
| 3530 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3531 // user code which calls methods in java.lang.Compiler. | |
| 3532 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3533 // system domains are on the stack when the properties are read. | |
| 3534 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3535 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3536 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3537 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3538 // Once that is done, we should remove this hack. | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3539 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
| 0 | 3540 |
| 3541 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3542 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3543 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3544 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3545 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3546 reset_vm_info_property(CHECK_0); | |
| 3547 | |
| 3548 quicken_jni_functions(); | |
| 3549 | |
|
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3550 // Must be run after init_ft which initializes ft_enabled |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3551 if (TRACE_INITIALIZE() != JNI_OK) { |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3552 vm_exit_during_initialization("Failed to initialize tracing backend"); |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3553 } |
|
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3554 |
| 0 | 3555 // Set flag that basic initialization has completed. Used by exceptions and various |
| 3556 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3557 set_init_completed(); | |
| 3558 | |
| 4006 | 3559 #ifndef USDT2 |
| 0 | 3560 HS_DTRACE_PROBE(hotspot, vm__init__end); |
| 4006 | 3561 #else /* USDT2 */ |
| 3562 HOTSPOT_VM_INIT_END(); | |
| 3563 #endif /* USDT2 */ | |
| 0 | 3564 |
| 3565 // record VM initialization completion time | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3566 #if INCLUDE_MANAGEMENT |
| 0 | 3567 Management::record_vm_init_completed(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3568 #endif // INCLUDE_MANAGEMENT |
| 0 | 3569 |
| 3570 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3571 // valid exceptions may be thrown in the process. | |
| 3572 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3573 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3574 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3575 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3576 if (HAS_PENDING_EXCEPTION) { | |
| 3577 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3578 } | |
| 3579 | |
| 3580 #ifndef SERIALGC | |
| 3581 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3582 // and better encapsulated. The ugly nested if test would go away |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3583 // once things are properly refactored. XXX YSR |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3584 if (UseConcMarkSweepGC || UseG1GC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3585 if (UseConcMarkSweepGC) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3586 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3587 } else { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3588 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3589 } |
| 0 | 3590 if (HAS_PENDING_EXCEPTION) { |
| 3591 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3592 } | |
| 3593 } | |
| 3594 #endif // SERIALGC | |
| 3595 | |
| 3596 // Always call even when there are not JVMTI environments yet, since environments | |
| 3597 // may be attached late and JVMTI must track phases of VM execution | |
| 3598 JvmtiExport::enter_live_phase(); | |
| 3599 | |
| 3600 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3601 os::signal_init(); | |
| 3602 | |
| 3603 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3604 if (!DisableAttachMechanism) { | |
| 3605 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3606 AttachListener::init(); | |
| 3607 } | |
| 3608 } | |
| 3609 | |
| 3610 // Launch -Xrun agents | |
| 3611 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3612 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3613 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3614 create_vm_init_libraries(); | |
| 3615 } | |
| 3616 | |
|
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3617 // 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
|
3618 JvmtiExport::post_vm_initialized(); |
|
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3619 |
|
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3620 if (!TRACE_START()) { |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3621 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3622 } |
|
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3623 |
|
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3624 if (CleanChunkPoolAsync) { |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3625 Chunk::start_chunk_pool_cleaner_task(); |
|
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3626 } |
| 0 | 3627 |
| 3628 // initialize compiler(s) | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3629 #if defined(COMPILER1) || defined(COMPILER2) |
| 0 | 3630 CompileBroker::compilation_init(); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3631 #endif |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3632 |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3633 #if INCLUDE_MANAGEMENT |
| 0 | 3634 Management::initialize(THREAD); |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3635 #endif // INCLUDE_MANAGEMENT |
|
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3636 |
| 0 | 3637 if (HAS_PENDING_EXCEPTION) { |
| 3638 // management agent fails to start possibly due to | |
| 3639 // configuration problem and is responsible for printing | |
| 3640 // stack trace if appropriate. Simply exit VM. | |
| 3641 vm_exit(1); | |
| 3642 } | |
| 3643 | |
| 3644 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3645 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3646 if (MemProfiling) MemProfiler::engage(); | |
| 3647 StatSampler::engage(); | |
| 3648 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3649 | |
| 3650 BiasedLocking::init(); | |
| 3651 | |
|
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3652 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
|
3653 call_postVMInitHook(THREAD); |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3654 // 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
|
3655 // exceptions and provide means of diagnosis. |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3656 if (HAS_PENDING_EXCEPTION) { |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3657 CLEAR_PENDING_EXCEPTION; |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3658 } |
|
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3659 } |
| 0 | 3660 |
| 3661 // Start up the WatcherThread if there are any periodic tasks | |
| 3662 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3663 // aren't, late joiners might appear to start slowly (we might | |
| 3664 // take a while to process their first tick). | |
| 3665 if (PeriodicTask::num_tasks() > 0) { | |
| 3666 WatcherThread::start(); | |
| 3667 } | |
| 3668 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3669 // Give os specific code one last chance to start |
|
126ea7725993
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changeset
|
3670 os::init_3(); |
|
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|
3671 |
| 0 | 3672 create_vm_timer.end(); |
|
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|
3673 #ifdef ASSERT |
|
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|
3674 _vm_complete = true; |
|
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|
3675 #endif |
| 0 | 3676 return JNI_OK; |
| 3677 } | |
| 3678 | |
| 3679 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3680 extern "C" { | |
| 3681 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3682 } | |
| 3683 // Find a command line agent library and return its entry point for | |
| 3684 // -agentlib: -agentpath: -Xrun | |
| 3685 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3686 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3687 OnLoadEntry_t on_load_entry = NULL; | |
| 3688 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3689 | |
| 3690 if (library == NULL) { | |
| 3691 char buffer[JVM_MAXPATHLEN]; | |
| 3692 char ebuf[1024]; | |
| 3693 const char *name = agent->name(); | |
|
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ab3fd720516c
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|
3694 const char *msg = "Could not find agent library "; |
| 0 | 3695 |
| 3696 if (agent->is_absolute_path()) { | |
|
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|
3697 library = os::dll_load(name, ebuf, sizeof ebuf); |
| 0 | 3698 if (library == NULL) { |
|
1694
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diff
changeset
|
3699 const char *sub_msg = " in absolute path, with error: "; |
|
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|
3700 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3701 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
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|
3702 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3703 // If we can't find the agent, exit. |
|
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
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diff
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|
3704 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3705 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3706 } |
| 3707 } else { | |
| 3708 // Try to load the agent from the standard dll directory | |
|
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diff
changeset
|
3709 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
|
6cb0d32b828b
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|
3710 name)) { |
|
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|
3711 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
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|
3712 } |
| 0 | 3713 #ifdef KERNEL |
| 3714 // Download instrument dll | |
| 3715 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3716 char *props = Arguments::get_kernel_properties(); | |
| 3717 char *home = Arguments::get_java_home(); | |
| 3718 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3719 " sun.jkernel.DownloadManager -download client_jvm"; | |
|
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|
3720 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
| 6197 | 3721 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
| 0 | 3722 jio_snprintf(cmd, length, fmt, home, props); |
| 3723 int status = os::fork_and_exec(cmd); | |
| 3724 FreeHeap(props); | |
| 3725 if (status == -1) { | |
| 3726 warning(cmd); | |
| 3727 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3728 strerror(errno)); | |
| 3729 } | |
| 6197 | 3730 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
| 0 | 3731 // when this comes back the instrument.dll should be where it belongs. |
|
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diff
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|
3732 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
| 0 | 3733 } |
| 3734 #endif // KERNEL | |
| 3735 if (library == NULL) { // Try the local directory | |
| 3736 char ns[1] = {0}; | |
|
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diff
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|
3737 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
|
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diff
changeset
|
3738 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
|
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diff
changeset
|
3739 } |
| 0 | 3740 if (library == NULL) { |
|
1694
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diff
changeset
|
3741 const char *sub_msg = " on the library path, with error: "; |
|
ab3fd720516c
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diff
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|
3742 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
| 6197 | 3743 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
|
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diff
changeset
|
3744 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
| 0 | 3745 // If we can't find the agent, exit. |
|
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diff
changeset
|
3746 vm_exit_during_initialization(buf, NULL); |
| 6197 | 3747 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
| 0 | 3748 } |
| 3749 } | |
| 3750 } | |
| 3751 agent->set_os_lib(library); | |
| 3752 } | |
| 3753 | |
| 3754 // Find the OnLoad function. | |
| 3755 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
|
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diff
changeset
|
3756 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
| 0 | 3757 if (on_load_entry != NULL) break; |
| 3758 } | |
| 3759 return on_load_entry; | |
| 3760 } | |
| 3761 | |
| 3762 // Find the JVM_OnLoad entry point | |
| 3763 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3764 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3765 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3766 } | |
| 3767 | |
| 3768 // Find the Agent_OnLoad entry point | |
| 3769 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3770 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3771 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3772 } | |
| 3773 | |
| 3774 // For backwards compatibility with -Xrun | |
| 3775 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3776 // treated like -agentpath: | |
| 3777 // Must be called before agent libraries are created | |
| 3778 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3779 AgentLibrary* agent; | |
| 3780 AgentLibrary* next; | |
| 3781 | |
| 3782 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3783 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3784 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3785 | |
| 3786 // If there is an JVM_OnLoad function it will get called later, | |
| 3787 // otherwise see if there is an Agent_OnLoad | |
| 3788 if (on_load_entry == NULL) { | |
| 3789 on_load_entry = lookup_agent_on_load(agent); | |
| 3790 if (on_load_entry != NULL) { | |
| 3791 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3792 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3793 Arguments::convert_library_to_agent(agent); | |
| 3794 } else { | |
| 3795 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3796 } | |
| 3797 } | |
| 3798 } | |
| 3799 } | |
| 3800 | |
| 3801 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3802 // Invokes Agent_OnLoad | |
| 3803 // Called very early -- before JavaThreads exist | |
| 3804 void Threads::create_vm_init_agents() { | |
| 3805 extern struct JavaVM_ main_vm; | |
| 3806 AgentLibrary* agent; | |
| 3807 | |
| 3808 JvmtiExport::enter_onload_phase(); | |
|
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
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6769
diff
changeset
|
3809 |
| 0 | 3810 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
| 3811 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3812 | |
| 3813 if (on_load_entry != NULL) { | |
| 3814 // Invoke the Agent_OnLoad function | |
| 3815 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3816 if (err != JNI_OK) { | |
| 3817 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3818 } | |
| 3819 } else { | |
| 3820 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3821 } | |
| 3822 } | |
| 3823 JvmtiExport::enter_primordial_phase(); | |
| 3824 } | |
| 3825 | |
| 3826 extern "C" { | |
| 3827 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3828 } | |
| 3829 | |
| 3830 void Threads::shutdown_vm_agents() { | |
| 3831 // Send any Agent_OnUnload notifications | |
| 3832 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3833 extern struct JavaVM_ main_vm; | |
| 3834 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3835 | |
| 3836 // Find the Agent_OnUnload function. | |
| 3837 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3838 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
|
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1972
diff
changeset
|
3839 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
| 0 | 3840 |
| 3841 // Invoke the Agent_OnUnload function | |
| 3842 if (unload_entry != NULL) { | |
| 3843 JavaThread* thread = JavaThread::current(); | |
| 3844 ThreadToNativeFromVM ttn(thread); | |
| 3845 HandleMark hm(thread); | |
| 3846 (*unload_entry)(&main_vm); | |
| 3847 break; | |
| 3848 } | |
| 3849 } | |
| 3850 } | |
| 3851 } | |
| 3852 | |
| 3853 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3854 // Invokes JVM_OnLoad | |
| 3855 void Threads::create_vm_init_libraries() { | |
| 3856 extern struct JavaVM_ main_vm; | |
| 3857 AgentLibrary* agent; | |
| 3858 | |
| 3859 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3860 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3861 | |
| 3862 if (on_load_entry != NULL) { | |
| 3863 // Invoke the JVM_OnLoad function | |
| 3864 JavaThread* thread = JavaThread::current(); | |
| 3865 ThreadToNativeFromVM ttn(thread); | |
| 3866 HandleMark hm(thread); | |
| 3867 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3868 if (err != JNI_OK) { | |
| 3869 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3870 } | |
| 3871 } else { | |
| 3872 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3873 } | |
| 3874 } | |
| 3875 } | |
| 3876 | |
| 3877 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3878 void JavaThread::invoke_shutdown_hooks() { | |
| 3879 HandleMark hm(this); | |
| 3880 | |
| 3881 // We could get here with a pending exception, if so clear it now. | |
| 3882 if (this->has_pending_exception()) { | |
| 3883 this->clear_pending_exception(); | |
| 3884 } | |
| 3885 | |
| 3886 EXCEPTION_MARK; | |
|
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diff
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|
3887 Klass* k = |
|
2177
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3888 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
| 0 | 3889 THREAD); |
| 3890 if (k != NULL) { | |
| 3891 // SystemDictionary::resolve_or_null will return null if there was | |
| 3892 // an exception. If we cannot load the Shutdown class, just don't | |
| 3893 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3894 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3895 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3896 // was called, the Shutdown class would have already been loaded | |
| 3897 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3898 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3899 JavaValue result(T_VOID); | |
| 3900 JavaCalls::call_static(&result, | |
| 3901 shutdown_klass, | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3902 vmSymbols::shutdown_method_name(), |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3903 vmSymbols::void_method_signature(), |
| 0 | 3904 THREAD); |
| 3905 } | |
| 3906 CLEAR_PENDING_EXCEPTION; | |
| 3907 } | |
| 3908 | |
| 3909 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3910 // the program falls off the end of main(). Another VM exit path is through | |
| 3911 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3912 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3913 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3914 // and VM_Exit op at VM level. | |
| 3915 // | |
| 3916 // Shutdown sequence: | |
| 6197 | 3917 // + Shutdown native memory tracking if it is on |
| 0 | 3918 // + Wait until we are the last non-daemon thread to execute |
| 3919 // <-- every thing is still working at this moment --> | |
| 3920 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3921 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3922 // + Call before_exit(), prepare for VM exit | |
| 3923 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3924 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3925 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3926 // post thread end and vm death events to JVMTI, | |
| 3927 // stop signal thread | |
| 3928 // + Call JavaThread::exit(), it will: | |
| 3929 // > release JNI handle blocks, remove stack guard pages | |
| 3930 // > remove this thread from Threads list | |
| 3931 // <-- no more Java code from this thread after this point --> | |
| 3932 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3933 // the compiler threads at safepoint | |
| 3934 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3935 // + Disable tracing at JNI/JVM barriers | |
| 3936 // + Set _vm_exited flag for threads that are still running native code | |
| 3937 // + Delete this thread | |
| 3938 // + Call exit_globals() | |
| 3939 // > deletes tty | |
| 3940 // > deletes PerfMemory resources | |
| 3941 // + Return to caller | |
| 3942 | |
| 3943 bool Threads::destroy_vm() { | |
| 3944 JavaThread* thread = JavaThread::current(); | |
| 3945 | |
|
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|
3946 #ifdef ASSERT |
|
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|
3947 _vm_complete = false; |
|
da91efe96a93
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diff
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|
3948 #endif |
| 0 | 3949 // Wait until we are the last non-daemon thread to execute |
| 3950 { MutexLocker nu(Threads_lock); | |
| 3951 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3952 // This wait should make safepoint checks, wait without a timeout, | |
| 3953 // and wait as a suspend-equivalent condition. | |
| 3954 // | |
| 3955 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3956 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3957 // is waiting for the external suspend request on this thread to | |
| 3958 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3959 // timeout, but that takes time. Making this wait a suspend- | |
| 3960 // equivalent condition solves that timeout problem. | |
| 3961 // | |
| 3962 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3963 Mutex::_as_suspend_equivalent_flag); | |
| 3964 } | |
| 3965 | |
| 6197 | 3966 // Shutdown NMT before exit. Otherwise, |
| 3967 // it will run into trouble when system destroys static variables. | |
| 3968 MemTracker::shutdown(MemTracker::NMT_normal); | |
| 3969 | |
| 0 | 3970 // Hang forever on exit if we are reporting an error. |
| 3971 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3972 os::infinite_sleep(); | |
| 3973 } | |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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parents:
2203
diff
changeset
|
3974 os::wait_for_keypress_at_exit(); |
| 0 | 3975 |
| 3976 if (JDK_Version::is_jdk12x_version()) { | |
| 3977 // We are the last thread running, so check if finalizers should be run. | |
| 3978 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3979 HandleMark rm(thread); | |
| 3980 Universe::run_finalizers_on_exit(); | |
| 3981 } else { | |
| 3982 // run Java level shutdown hooks | |
| 3983 thread->invoke_shutdown_hooks(); | |
| 3984 } | |
| 3985 | |
| 3986 before_exit(thread); | |
| 3987 | |
| 3988 thread->exit(true); | |
| 3989 | |
| 3990 // Stop VM thread. | |
| 3991 { | |
| 3992 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3993 // GC vm_operations can get caught at the safepoint, and the | |
| 3994 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3995 // to prevent this. The GC vm_operations will not be able to | |
| 3996 // queue until after the vm thread is dead. | |
|
3769
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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3388
diff
changeset
|
3997 // After this point, we'll never emerge out of the safepoint before |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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3388
diff
changeset
|
3998 // the VM exits, so concurrent GC threads do not need to be explicitly |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
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3388
diff
changeset
|
3999 // stopped; they remain inactive until the process exits. |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
4000 // Note: some concurrent G1 threads may be running during a safepoint, |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3388
diff
changeset
|
4001 // but these will not be accessing the heap, just some G1-specific side |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3388
diff
changeset
|
4002 // data structures that are not accessed by any other threads but them |
|
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
4003 // after this point in a terminal safepoint. |
|
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|
4004 |
| 0 | 4005 MutexLocker ml(Heap_lock); |
| 4006 | |
| 4007 VMThread::wait_for_vm_thread_exit(); | |
| 4008 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 4009 VMThread::destroy(); | |
| 4010 } | |
| 4011 | |
| 4012 // clean up ideal graph printers | |
| 4013 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 4014 IdealGraphPrinter::clean_up(); | |
| 4015 #endif | |
| 4016 | |
| 4017 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 4018 // running Java code or in VM are stopped by the Safepoint. However, | |
| 4019 // daemon threads executing native code are still running. But they | |
| 4020 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 4021 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 4022 | |
| 4023 #ifndef PRODUCT | |
| 4024 // disable function tracing at JNI/JVM barriers | |
| 4025 TraceJNICalls = false; | |
| 4026 TraceJVMCalls = false; | |
| 4027 TraceRuntimeCalls = false; | |
| 4028 #endif | |
| 4029 | |
| 4030 VM_Exit::set_vm_exited(); | |
| 4031 | |
| 4032 notify_vm_shutdown(); | |
| 4033 | |
| 4034 delete thread; | |
| 4035 | |
| 4036 // exit_globals() will delete tty | |
| 4037 exit_globals(); | |
| 4038 | |
| 4039 return true; | |
| 4040 } | |
| 4041 | |
| 4042 | |
| 4043 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 4044 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 4045 return is_supported_jni_version(version); | |
| 4046 } | |
| 4047 | |
| 4048 | |
| 4049 jboolean Threads::is_supported_jni_version(jint version) { | |
| 4050 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 4051 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 4052 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 4053 return JNI_FALSE; | |
| 4054 } | |
| 4055 | |
| 4056 | |
| 4057 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 4058 // The threads lock must be owned at this point | |
| 4059 assert_locked_or_safepoint(Threads_lock); | |
|
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|
4060 |
|
6e0aac35bfa9
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|
4061 // See the comment for this method in thread.hpp for its purpose and |
|
6e0aac35bfa9
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|
4062 // why it is called here. |
|
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|
4063 p->initialize_queues(); |
| 0 | 4064 p->set_next(_thread_list); |
| 4065 _thread_list = p; | |
| 4066 _number_of_threads++; | |
| 4067 oop threadObj = p->threadObj(); | |
| 4068 bool daemon = true; | |
| 4069 // Bootstrapping problem: threadObj can be null for initial | |
| 4070 // JavaThread (or for threads attached via JNI) | |
| 4071 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 4072 _number_of_non_daemon_threads++; | |
| 4073 daemon = false; | |
| 4074 } | |
| 4075 | |
| 6197 | 4076 p->set_safepoint_visible(true); |
| 4077 | |
| 0 | 4078 ThreadService::add_thread(p, daemon); |
| 4079 | |
| 4080 // Possible GC point. | |
|
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7141200: log some interesting information in ring buffers for crashes
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diff
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|
4081 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
| 0 | 4082 } |
| 4083 | |
| 4084 void Threads::remove(JavaThread* p) { | |
| 4085 // Extra scope needed for Thread_lock, so we can check | |
| 4086 // that we do not remove thread without safepoint code notice | |
| 4087 { MutexLocker ml(Threads_lock); | |
| 4088 | |
| 4089 assert(includes(p), "p must be present"); | |
| 4090 | |
| 4091 JavaThread* current = _thread_list; | |
| 4092 JavaThread* prev = NULL; | |
| 4093 | |
| 4094 while (current != p) { | |
| 4095 prev = current; | |
| 4096 current = current->next(); | |
| 4097 } | |
| 4098 | |
| 4099 if (prev) { | |
| 4100 prev->set_next(current->next()); | |
| 4101 } else { | |
| 4102 _thread_list = p->next(); | |
| 4103 } | |
| 4104 _number_of_threads--; | |
| 4105 oop threadObj = p->threadObj(); | |
| 4106 bool daemon = true; | |
| 4107 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 4108 _number_of_non_daemon_threads--; | |
| 4109 daemon = false; | |
| 4110 | |
| 4111 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 4112 // on destroy_vm will wake up. | |
| 4113 if (number_of_non_daemon_threads() == 1) | |
| 4114 Threads_lock->notify_all(); | |
| 4115 } | |
| 4116 ThreadService::remove_thread(p, daemon); | |
| 4117 | |
| 4118 // Make sure that safepoint code disregard this thread. This is needed since | |
| 4119 // the thread might mess around with locks after this point. This can cause it | |
| 4120 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 4121 // of this thread since it is removed from the queue. | |
| 4122 p->set_terminated_value(); | |
| 6197 | 4123 |
| 4124 // Now, this thread is not visible to safepoint | |
| 4125 p->set_safepoint_visible(false); | |
|
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7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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|
4126 // once the thread becomes safepoint invisible, we can not use its per-thread |
|
716c64bda5ba
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|
4127 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
|
716c64bda5ba
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|
4128 // to release its per-thread recorder here. |
|
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|
4129 MemTracker::thread_exiting(p); |
| 0 | 4130 } // unlock Threads_lock |
| 4131 | |
| 4132 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
|
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|
4133 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
| 0 | 4134 } |
| 4135 | |
| 4136 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 4137 bool Threads::includes(JavaThread* p) { | |
| 4138 assert(Threads_lock->is_locked(), "sanity check"); | |
| 4139 ALL_JAVA_THREADS(q) { | |
| 4140 if (q == p ) { | |
| 4141 return true; | |
| 4142 } | |
| 4143 } | |
| 4144 return false; | |
| 4145 } | |
| 4146 | |
| 4147 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 4148 // but the garbage collector must provide a safe context for them to run. | |
| 4149 // In particular, these things should never be called when the Threads_lock | |
| 4150 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 4151 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 4152 // all threads gets blocked when exiting or starting). | |
| 4153 | |
|
989
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|
4154 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4155 ALL_JAVA_THREADS(p) { |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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diff
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|
4156 p->oops_do(f, cf); |
| 0 | 4157 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
4158 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 4159 } |
| 4160 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
4161 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 4162 // Introduce a mechanism allowing parallel threads to claim threads as |
| 4163 // root groups. Overhead should be small enough to use all the time, | |
| 4164 // even in sequential code. | |
| 4165 SharedHeap* sh = SharedHeap::heap(); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4166 // Cannot yet substitute active_workers for n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
4167 // because of G1CollectedHeap::verify() use of |
|
bca17e38de00
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|
4168 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
|
bca17e38de00
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|
4169 // turn off parallelism in process_strong_roots while active_workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4170 // is being used for parallelism elsewhere. |
|
bca17e38de00
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diff
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|
4171 bool is_par = sh->n_par_threads() > 0; |
|
bca17e38de00
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diff
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|
4172 assert(!is_par || |
|
bca17e38de00
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|
4173 (SharedHeap::heap()->n_par_threads() == |
|
bca17e38de00
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diff
changeset
|
4174 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 4175 int cp = SharedHeap::heap()->strong_roots_parity(); |
| 4176 ALL_JAVA_THREADS(p) { | |
| 4177 if (p->claim_oops_do(is_par, cp)) { | |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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|
4178 p->oops_do(f, cf); |
| 0 | 4179 } |
| 4180 } | |
| 4181 VMThread* vmt = VMThread::vm_thread(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4182 if (vmt->claim_oops_do(is_par, cp)) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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diff
changeset
|
4183 vmt->oops_do(f, cf); |
|
3979
4dfb2df418f2
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|
4184 } |
| 0 | 4185 } |
| 4186 | |
| 4187 #ifndef SERIALGC | |
| 4188 // Used by ParallelScavenge | |
| 4189 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 4190 ALL_JAVA_THREADS(p) { | |
| 4191 q->enqueue(new ThreadRootsTask(p)); | |
| 4192 } | |
| 4193 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 4194 } | |
| 4195 | |
| 4196 // Used by Parallel Old | |
| 4197 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 4198 ALL_JAVA_THREADS(p) { | |
| 4199 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 4200 } | |
| 4201 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 4202 } | |
| 4203 #endif // SERIALGC | |
| 4204 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4205 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 4206 ALL_JAVA_THREADS(p) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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844
diff
changeset
|
4207 p->nmethods_do(cf); |
| 0 | 4208 } |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
4209 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 4210 } |
| 4211 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4212 void Threads::metadata_do(void f(Metadata*)) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4213 ALL_JAVA_THREADS(p) { |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4214 p->metadata_do(f); |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4215 } |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4216 } |
|
da91efe96a93
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diff
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|
4217 |
| 0 | 4218 void Threads::gc_epilogue() { |
| 4219 ALL_JAVA_THREADS(p) { | |
| 4220 p->gc_epilogue(); | |
| 4221 } | |
| 4222 } | |
| 4223 | |
| 4224 void Threads::gc_prologue() { | |
| 4225 ALL_JAVA_THREADS(p) { | |
| 4226 p->gc_prologue(); | |
| 4227 } | |
| 4228 } | |
| 4229 | |
| 4230 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 4231 ALL_JAVA_THREADS(p) { | |
| 4232 p->deoptimized_wrt_marked_nmethods(); | |
| 4233 } | |
| 4234 } | |
| 4235 | |
| 4236 | |
| 4237 // Get count Java threads that are waiting to enter the specified monitor. | |
| 4238 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 4239 address monitor, bool doLock) { | |
| 4240 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 4241 "must grab Threads_lock or be at safepoint"); | |
| 4242 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 4243 | |
| 4244 int i = 0; | |
| 4245 { | |
| 4246 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4247 ALL_JAVA_THREADS(p) { | |
| 4248 if (p->is_Compiler_thread()) continue; | |
| 4249 | |
| 4250 address pending = (address)p->current_pending_monitor(); | |
| 4251 if (pending == monitor) { // found a match | |
| 4252 if (i < count) result->append(p); // save the first count matches | |
| 4253 i++; | |
| 4254 } | |
| 4255 } | |
| 4256 } | |
| 4257 return result; | |
| 4258 } | |
| 4259 | |
| 4260 | |
| 4261 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 4262 assert(doLock || | |
| 4263 Threads_lock->owned_by_self() || | |
| 4264 SafepointSynchronize::is_at_safepoint(), | |
| 4265 "must grab Threads_lock or be at safepoint"); | |
| 4266 | |
| 4267 // NULL owner means not locked so we can skip the search | |
| 4268 if (owner == NULL) return NULL; | |
| 4269 | |
| 4270 { | |
| 4271 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4272 ALL_JAVA_THREADS(p) { | |
| 4273 // first, see if owner is the address of a Java thread | |
| 4274 if (owner == (address)p) return p; | |
| 4275 } | |
| 4276 } | |
| 4277 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 4278 if (UseHeavyMonitors) return NULL; | |
| 4279 | |
| 4280 // | |
| 4281 // If we didn't find a matching Java thread and we didn't force use of | |
| 4282 // heavyweight monitors, then the owner is the stack address of the | |
| 4283 // Lock Word in the owning Java thread's stack. | |
| 4284 // | |
| 4285 JavaThread* the_owner = NULL; | |
| 4286 { | |
| 4287 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 4288 ALL_JAVA_THREADS(q) { | |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
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669
diff
changeset
|
4289 if (q->is_lock_owned(owner)) { |
| 0 | 4290 the_owner = q; |
|
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
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669
diff
changeset
|
4291 break; |
| 0 | 4292 } |
| 4293 } | |
| 4294 } | |
| 4295 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 4296 return the_owner; | |
| 4297 } | |
| 4298 | |
| 4299 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 4300 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 4301 char buf[32]; | |
| 4302 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 4303 | |
| 4304 st->print_cr("Full thread dump %s (%s %s):", | |
| 4305 Abstract_VM_Version::vm_name(), | |
| 4306 Abstract_VM_Version::vm_release(), | |
| 4307 Abstract_VM_Version::vm_info_string() | |
| 4308 ); | |
| 4309 st->cr(); | |
| 4310 | |
| 4311 #ifndef SERIALGC | |
| 4312 // Dump concurrent locks | |
| 4313 ConcurrentLocksDump concurrent_locks; | |
| 4314 if (print_concurrent_locks) { | |
| 4315 concurrent_locks.dump_at_safepoint(); | |
| 4316 } | |
| 4317 #endif // SERIALGC | |
| 4318 | |
| 4319 ALL_JAVA_THREADS(p) { | |
| 4320 ResourceMark rm; | |
| 4321 p->print_on(st); | |
| 4322 if (print_stacks) { | |
| 4323 if (internal_format) { | |
| 4324 p->trace_stack(); | |
| 4325 } else { | |
| 4326 p->print_stack_on(st); | |
| 4327 } | |
| 4328 } | |
| 4329 st->cr(); | |
| 4330 #ifndef SERIALGC | |
| 4331 if (print_concurrent_locks) { | |
| 4332 concurrent_locks.print_locks_on(p, st); | |
| 4333 } | |
| 4334 #endif // SERIALGC | |
| 4335 } | |
| 4336 | |
| 4337 VMThread::vm_thread()->print_on(st); | |
| 4338 st->cr(); | |
| 4339 Universe::heap()->print_gc_threads_on(st); | |
| 4340 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 6766 | 4341 if (wt != NULL) { |
| 4342 wt->print_on(st); | |
| 4343 st->cr(); | |
| 4344 } | |
| 0 | 4345 CompileBroker::print_compiler_threads_on(st); |
| 4346 st->flush(); | |
| 4347 } | |
| 4348 | |
| 4349 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 4350 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 4351 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 4352 // memory (even in resource area), it might deadlock the error handler. | |
| 4353 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 4354 bool found_current = false; | |
| 4355 st->print_cr("Java Threads: ( => current thread )"); | |
| 4356 ALL_JAVA_THREADS(thread) { | |
| 4357 bool is_current = (current == thread); | |
| 4358 found_current = found_current || is_current; | |
| 4359 | |
| 4360 st->print("%s", is_current ? "=>" : " "); | |
| 4361 | |
| 4362 st->print(PTR_FORMAT, thread); | |
| 4363 st->print(" "); | |
| 4364 thread->print_on_error(st, buf, buflen); | |
| 4365 st->cr(); | |
| 4366 } | |
| 4367 st->cr(); | |
| 4368 | |
| 4369 st->print_cr("Other Threads:"); | |
| 4370 if (VMThread::vm_thread()) { | |
| 4371 bool is_current = (current == VMThread::vm_thread()); | |
| 4372 found_current = found_current || is_current; | |
| 4373 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 4374 | |
| 4375 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 4376 st->print(" "); | |
| 4377 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 4378 st->cr(); | |
| 4379 } | |
| 4380 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 4381 if (wt != NULL) { | |
| 4382 bool is_current = (current == wt); | |
| 4383 found_current = found_current || is_current; | |
| 4384 st->print("%s", is_current ? "=>" : " "); | |
| 4385 | |
| 4386 st->print(PTR_FORMAT, wt); | |
| 4387 st->print(" "); | |
| 4388 wt->print_on_error(st, buf, buflen); | |
| 4389 st->cr(); | |
| 4390 } | |
| 4391 if (!found_current) { | |
| 4392 st->cr(); | |
| 4393 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 4394 current->print_on_error(st, buf, buflen); | |
| 4395 st->cr(); | |
| 4396 } | |
| 4397 } | |
| 4398 | |
| 1878 | 4399 // Internal SpinLock and Mutex |
| 4400 // Based on ParkEvent | |
| 4401 | |
| 4402 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
| 0 | 4403 // |
| 1878 | 4404 // We employ SpinLocks _only for low-contention, fixed-length |
| 4405 // short-duration critical sections where we're concerned | |
| 4406 // about native mutex_t or HotSpot Mutex:: latency. | |
| 4407 // The mux construct provides a spin-then-block mutual exclusion | |
| 4408 // mechanism. | |
| 4409 // | |
| 4410 // Testing has shown that contention on the ListLock guarding gFreeList | |
| 4411 // is common. If we implement ListLock as a simple SpinLock it's common | |
| 4412 // for the JVM to devolve to yielding with little progress. This is true | |
| 4413 // despite the fact that the critical sections protected by ListLock are | |
| 4414 // extremely short. | |
| 0 | 4415 // |
| 1878 | 4416 // TODO-FIXME: ListLock should be of type SpinLock. |
| 4417 // We should make this a 1st-class type, integrated into the lock | |
| 4418 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
| 4419 // should have sufficient padding to avoid false-sharing and excessive | |
| 4420 // cache-coherency traffic. | |
| 4421 | |
| 4422 | |
| 4423 typedef volatile int SpinLockT ; | |
| 4424 | |
| 4425 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
| 4426 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
| 4427 return ; // normal fast-path return | |
| 4428 } | |
| 4429 | |
| 4430 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
| 4431 TEVENT (SpinAcquire - ctx) ; | |
| 4432 int ctr = 0 ; | |
| 4433 int Yields = 0 ; | |
| 0 | 4434 for (;;) { |
| 1878 | 4435 while (*adr != 0) { |
| 4436 ++ctr ; | |
| 4437 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
| 4438 if (Yields > 5) { | |
| 4439 // Consider using a simple NakedSleep() instead. | |
| 4440 // Then SpinAcquire could be called by non-JVM threads | |
| 4441 Thread::current()->_ParkEvent->park(1) ; | |
| 4442 } else { | |
| 4443 os::NakedYield() ; | |
| 4444 ++Yields ; | |
| 4445 } | |
| 4446 } else { | |
| 4447 SpinPause() ; | |
| 0 | 4448 } |
| 1878 | 4449 } |
| 4450 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
| 0 | 4451 } |
| 4452 } | |
| 4453 | |
| 1878 | 4454 void Thread::SpinRelease (volatile int * adr) { |
| 4455 assert (*adr != 0, "invariant") ; | |
| 4456 OrderAccess::fence() ; // guarantee at least release consistency. | |
| 4457 // Roach-motel semantics. | |
| 4458 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
| 4459 // but prior LDs and STs within the critical section can't be allowed | |
| 4460 // to reorder or float past the ST that releases the lock. | |
| 4461 *adr = 0 ; | |
| 0 | 4462 } |
| 4463 | |
| 1878 | 4464 // muxAcquire and muxRelease: |
| 4465 // | |
| 4466 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
| 4467 // The LSB of the word is set IFF the lock is held. | |
| 4468 // The remainder of the word points to the head of a singly-linked list | |
| 4469 // of threads blocked on the lock. | |
| 4470 // | |
| 4471 // * The current implementation of muxAcquire-muxRelease uses its own | |
| 4472 // dedicated Thread._MuxEvent instance. If we're interested in | |
| 4473 // minimizing the peak number of extant ParkEvent instances then | |
| 4474 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
| 4475 // as certain invariants were satisfied. Specifically, care would need | |
| 4476 // to be taken with regards to consuming unpark() "permits". | |
| 4477 // A safe rule of thumb is that a thread would never call muxAcquire() | |
| 4478 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
| 4479 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
| 4480 // consume an unpark() permit intended for monitorenter, for instance. | |
| 4481 // One way around this would be to widen the restricted-range semaphore | |
| 4482 // implemented in park(). Another alternative would be to provide | |
| 4483 // multiple instances of the PlatformEvent() for each thread. One | |
| 4484 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
| 4485 // | |
| 4486 // * Usage: | |
| 4487 // -- Only as leaf locks | |
| 4488 // -- for short-term locking only as muxAcquire does not perform | |
| 4489 // thread state transitions. | |
| 4490 // | |
| 4491 // Alternatives: | |
| 4492 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
| 4493 // but with parking or spin-then-park instead of pure spinning. | |
| 4494 // * Use Taura-Oyama-Yonenzawa locks. | |
| 4495 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
| 4496 // (List,LockByte). Acquire will CAS the full lockword while Release | |
| 4497 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
| 4498 // acquiring threads use timers (ParkTimed) to detect and recover from | |
| 4499 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
| 4500 // boundaries by using placement-new. | |
| 4501 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
| 4502 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
| 4503 // The validity of the backlinks must be ratified before we trust the value. | |
| 4504 // If the backlinks are invalid the exiting thread must back-track through the | |
| 4505 // the forward links, which are always trustworthy. | |
| 4506 // * Add a successor indication. The LockWord is currently encoded as | |
| 4507 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
| 4508 // to provide the usual futile-wakeup optimization. | |
| 4509 // See RTStt for details. | |
| 4510 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
| 4511 // | |
| 4512 | |
| 4513 | |
| 4514 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
| 4515 enum MuxBits { LOCKBIT = 1 } ; | |
| 4516 | |
| 4517 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
| 4518 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4519 if (w == 0) return ; | |
| 4520 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4521 return ; | |
| 4522 } | |
| 4523 | |
| 4524 TEVENT (muxAcquire - Contention) ; | |
| 4525 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
| 4526 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
| 0 | 4527 for (;;) { |
| 1878 | 4528 int its = (os::is_MP() ? 100 : 0) + 1 ; |
| 4529 | |
| 4530 // Optional spin phase: spin-then-park strategy | |
| 4531 while (--its >= 0) { | |
| 4532 w = *Lock ; | |
| 4533 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4534 return ; | |
| 4535 } | |
| 4536 } | |
| 4537 | |
| 4538 Self->reset() ; | |
| 4539 Self->OnList = intptr_t(Lock) ; | |
| 4540 // The following fence() isn't _strictly necessary as the subsequent | |
| 4541 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4542 OrderAccess::fence(); | |
| 4543 for (;;) { | |
| 4544 w = *Lock ; | |
| 4545 if ((w & LOCKBIT) == 0) { | |
| 4546 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4547 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
| 4548 return ; | |
| 4549 } | |
| 4550 continue ; // Interference -- *Lock changed -- Just retry | |
| 0 | 4551 } |
| 1878 | 4552 assert (w & LOCKBIT, "invariant") ; |
| 4553 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4554 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
| 4555 } | |
| 4556 | |
| 4557 while (Self->OnList != 0) { | |
| 4558 Self->park() ; | |
| 4559 } | |
| 0 | 4560 } |
| 4561 } | |
| 4562 | |
| 1878 | 4563 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
| 4564 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
| 4565 if (w == 0) return ; | |
| 4566 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4567 return ; | |
| 4568 } | |
| 4569 | |
| 4570 TEVENT (muxAcquire - Contention) ; | |
| 4571 ParkEvent * ReleaseAfter = NULL ; | |
| 4572 if (ev == NULL) { | |
| 4573 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
| 4574 } | |
| 4575 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
| 4576 for (;;) { | |
| 4577 guarantee (ev->OnList == 0, "invariant") ; | |
| 4578 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
| 4579 | |
| 4580 // Optional spin phase: spin-then-park strategy | |
| 4581 while (--its >= 0) { | |
| 4582 w = *Lock ; | |
| 4583 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4584 if (ReleaseAfter != NULL) { | |
| 4585 ParkEvent::Release (ReleaseAfter) ; | |
| 4586 } | |
| 4587 return ; | |
| 4588 } | |
| 4589 } | |
| 4590 | |
| 4591 ev->reset() ; | |
| 4592 ev->OnList = intptr_t(Lock) ; | |
| 4593 // The following fence() isn't _strictly necessary as the subsequent | |
| 4594 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
| 4595 OrderAccess::fence(); | |
| 4596 for (;;) { | |
| 4597 w = *Lock ; | |
| 4598 if ((w & LOCKBIT) == 0) { | |
| 4599 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
| 4600 ev->OnList = 0 ; | |
| 4601 // We call ::Release while holding the outer lock, thus | |
| 4602 // artificially lengthening the critical section. | |
| 4603 // Consider deferring the ::Release() until the subsequent unlock(), | |
| 4604 // after we've dropped the outer lock. | |
| 4605 if (ReleaseAfter != NULL) { | |
| 4606 ParkEvent::Release (ReleaseAfter) ; | |
| 4607 } | |
| 4608 return ; | |
| 4609 } | |
| 4610 continue ; // Interference -- *Lock changed -- Just retry | |
| 4611 } | |
| 4612 assert (w & LOCKBIT, "invariant") ; | |
| 4613 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
| 4614 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
| 4615 } | |
| 4616 | |
| 4617 while (ev->OnList != 0) { | |
| 4618 ev->park() ; | |
| 4619 } | |
| 4620 } | |
| 4621 } | |
| 4622 | |
| 4623 // Release() must extract a successor from the list and then wake that thread. | |
| 4624 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
| 4625 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
| 4626 // Release() would : | |
| 4627 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
| 4628 // (B) Extract a successor from the private list "in-hand" | |
| 4629 // (C) attempt to CAS() the residual back into *Lock over null. | |
| 4630 // If there were any newly arrived threads and the CAS() would fail. | |
| 4631 // In that case Release() would detach the RATs, re-merge the list in-hand | |
| 4632 // with the RATs and repeat as needed. Alternately, Release() might | |
| 4633 // detach and extract a successor, but then pass the residual list to the wakee. | |
| 4634 // The wakee would be responsible for reattaching and remerging before it | |
| 4635 // competed for the lock. | |
| 4636 // | |
| 4637 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
| 4638 // multiple concurrent pushers, but only one popper or detacher. | |
| 4639 // This implementation pops from the head of the list. This is unfair, | |
| 4640 // but tends to provide excellent throughput as hot threads remain hot. | |
| 4641 // (We wake recently run threads first). | |
| 4642 | |
| 4643 void Thread::muxRelease (volatile intptr_t * Lock) { | |
| 4644 for (;;) { | |
| 4645 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
| 4646 assert (w & LOCKBIT, "invariant") ; | |
| 4647 if (w == LOCKBIT) return ; | |
| 4648 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
| 4649 assert (List != NULL, "invariant") ; | |
| 4650 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
| 4651 ParkEvent * nxt = List->ListNext ; | |
| 4652 | |
| 4653 // The following CAS() releases the lock and pops the head element. | |
| 4654 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
| 4655 continue ; | |
| 4656 } | |
| 4657 List->OnList = 0 ; | |
| 4658 OrderAccess::fence() ; | |
| 4659 List->unpark () ; | |
| 4660 return ; | |
| 4661 } | |
| 4662 } | |
| 4663 | |
| 4664 | |
| 0 | 4665 void Threads::verify() { |
| 4666 ALL_JAVA_THREADS(p) { | |
| 4667 p->verify(); | |
| 4668 } | |
| 4669 VMThread* thread = VMThread::vm_thread(); | |
| 4670 if (thread != NULL) thread->verify(); | |
| 4671 } |