Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.hpp @ 4559:723df37192d6
Make it possible again to build a real client libjvm, drop the UseGraal flag.
Use the --vm option instead of a special -vm option in the bench command
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 10 Feb 2012 17:04:03 +0100 |
| parents | 04b9a2566eec |
| children | 33df1aeaebbf |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 #ifndef SHARE_VM_RUNTIME_THREAD_HPP |
| 26 #define SHARE_VM_RUNTIME_THREAD_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "memory/threadLocalAllocBuffer.hpp" | |
| 30 #include "oops/oop.hpp" | |
| 31 #include "prims/jni.h" | |
| 32 #include "prims/jvmtiExport.hpp" | |
| 33 #include "runtime/frame.hpp" | |
| 34 #include "runtime/javaFrameAnchor.hpp" | |
| 35 #include "runtime/jniHandles.hpp" | |
| 36 #include "runtime/mutexLocker.hpp" | |
| 37 #include "runtime/os.hpp" | |
| 38 #include "runtime/osThread.hpp" | |
| 39 #include "runtime/park.hpp" | |
| 40 #include "runtime/safepoint.hpp" | |
| 41 #include "runtime/stubRoutines.hpp" | |
| 42 #include "runtime/threadLocalStorage.hpp" | |
| 43 #include "runtime/unhandledOops.hpp" | |
| 44 #include "utilities/exceptions.hpp" | |
| 45 #include "utilities/top.hpp" | |
| 46 #ifndef SERIALGC | |
| 47 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
| 48 #include "gc_implementation/g1/satbQueue.hpp" | |
| 49 #endif | |
| 50 #ifdef ZERO | |
| 51 #ifdef TARGET_ARCH_zero | |
| 52 # include "stack_zero.hpp" | |
| 53 #endif | |
| 54 #endif | |
| 55 | |
| 0 | 56 class ThreadSafepointState; |
| 57 class ThreadProfiler; | |
| 58 | |
| 59 class JvmtiThreadState; | |
| 60 class JvmtiGetLoadedClassesClosure; | |
| 61 class ThreadStatistics; | |
| 62 class ConcurrentLocksDump; | |
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63 class ParkEvent; |
| 1878 | 64 class Parker; |
| 0 | 65 |
| 66 class ciEnv; | |
| 67 class CompileThread; | |
| 68 class CompileLog; | |
| 69 class CompileTask; | |
| 70 class CompileQueue; | |
| 71 class CompilerCounters; | |
| 72 class vframeArray; | |
| 73 | |
| 74 class DeoptResourceMark; | |
| 75 class jvmtiDeferredLocalVariableSet; | |
| 76 | |
| 77 class GCTaskQueue; | |
| 78 class ThreadClosure; | |
| 79 class IdealGraphPrinter; | |
| 80 | |
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81 class WorkerThread; |
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82 |
| 0 | 83 // Class hierarchy |
| 84 // - Thread | |
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85 // - NamedThread |
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86 // - VMThread |
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87 // - ConcurrentGCThread |
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88 // - WorkerThread |
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89 // - GangWorker |
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90 // - GCTaskThread |
| 0 | 91 // - JavaThread |
| 92 // - WatcherThread | |
| 93 | |
| 94 class Thread: public ThreadShadow { | |
| 95 friend class VMStructs; | |
| 96 private: | |
| 97 // Exception handling | |
| 98 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 99 //oop _pending_exception; // pending exception for current thread | |
| 100 // const char* _exception_file; // file information for exception (debugging only) | |
| 101 // int _exception_line; // line information for exception (debugging only) | |
| 102 | |
| 103 // Support for forcing alignment of thread objects for biased locking | |
| 104 void* _real_malloc_address; | |
| 105 public: | |
| 106 void* operator new(size_t size); | |
| 107 void operator delete(void* p); | |
| 108 private: | |
| 109 | |
| 110 // *************************************************************** | |
| 111 // Suspend and resume support | |
| 112 // *************************************************************** | |
| 113 // | |
| 114 // VM suspend/resume no longer exists - it was once used for various | |
| 115 // things including safepoints but was deprecated and finally removed | |
| 116 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 117 // suspension was considered "external", and this legacy naming scheme | |
| 118 // remains. | |
| 119 // | |
| 120 // External suspend/resume requests come from JVM_SuspendThread, | |
| 121 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 122 // ResumeThread. External | |
| 123 // suspend requests cause _external_suspend to be set and external | |
| 124 // resume requests cause _external_suspend to be cleared. | |
| 125 // External suspend requests do not nest on top of other external | |
| 126 // suspend requests. The higher level APIs reject suspend requests | |
| 127 // for already suspended threads. | |
| 128 // | |
| 129 // The external_suspend | |
| 130 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 131 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 132 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 133 // considered the same as being externally suspended; if the blocking | |
| 134 // condition lifts, the JavaThread will self-suspend. Other places | |
| 135 // where VM checks for external_suspend include: | |
| 136 // + mutex granting (do not enter monitors when thread is suspended) | |
| 137 // + state transitions from _thread_in_native | |
| 138 // | |
| 139 // In general, java_suspend() does not wait for an external suspend | |
| 140 // request to complete. When it returns, the only guarantee is that | |
| 141 // the _external_suspend field is true. | |
| 142 // | |
| 143 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 144 // suspend request to complete. External suspend requests are usually | |
| 145 // followed by some other interface call that requires the thread to | |
| 146 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 147 // the interface that requires quiescence, we give the JavaThread a | |
| 148 // chance to self-suspend before we need it to be quiescent. This | |
| 149 // improves overall suspend/query performance. | |
| 150 // | |
| 151 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 152 // It must be set under the protection of SR_lock. Read from the flag is | |
| 153 // OK without SR_lock as long as the value is only used as a hint. | |
| 154 // (e.g., check _external_suspend first without lock and then recheck | |
| 155 // inside SR_lock and finish the suspension) | |
| 156 // | |
| 157 // _suspend_flags is also overloaded for other "special conditions" so | |
| 158 // that a single check indicates whether any special action is needed | |
| 159 // eg. for async exceptions. | |
| 160 // ------------------------------------------------------------------- | |
| 161 // Notes: | |
| 162 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 163 // but we still update its value to keep other part of the system (mainly | |
| 164 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 165 // osThread.hpp). | |
| 166 // | |
| 167 // 2. It would be more natural if set_external_suspend() is private and | |
| 168 // part of java_suspend(), but that probably would affect the suspend/query | |
| 169 // performance. Need more investigation on this. | |
| 170 // | |
| 171 | |
| 172 // suspend/resume lock: used for self-suspend | |
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173 Monitor* _SR_lock; |
| 0 | 174 |
| 175 protected: | |
| 176 enum SuspendFlags { | |
| 177 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 178 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 179 | |
| 180 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 181 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 182 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 183 | |
| 184 _has_async_exception = 0x00000001U // there is a pending async exception | |
| 185 }; | |
| 186 | |
| 187 // various suspension related flags - atomically updated | |
| 188 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 189 volatile uint32_t _suspend_flags; | |
| 190 | |
| 191 private: | |
| 192 int _num_nested_signal; | |
| 193 | |
| 194 public: | |
| 195 void enter_signal_handler() { _num_nested_signal++; } | |
| 196 void leave_signal_handler() { _num_nested_signal--; } | |
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197 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
| 0 | 198 |
| 199 private: | |
| 200 // Debug tracing | |
| 201 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 202 | |
| 203 // Active_handles points to a block of handles | |
| 204 JNIHandleBlock* _active_handles; | |
| 205 | |
| 206 // One-element thread local free list | |
| 207 JNIHandleBlock* _free_handle_block; | |
| 208 | |
| 209 // Point to the last handle mark | |
| 210 HandleMark* _last_handle_mark; | |
| 211 | |
| 212 // The parity of the last strong_roots iteration in which this thread was | |
| 213 // claimed as a task. | |
| 214 jint _oops_do_parity; | |
| 215 | |
| 216 public: | |
| 217 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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218 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
| 0 | 219 private: |
| 220 | |
| 221 // debug support for checking if code does allow safepoints or not | |
| 222 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 223 // mutex, or blocking on an object synchronizer (Java locking). | |
| 224 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 225 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 226 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 227 // | |
| 228 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 229 // | |
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230 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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231 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
| 0 | 232 |
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233 // Used by SkipGCALot class. |
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234 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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235 |
| 0 | 236 // Record when GC is locked out via the GC_locker mechanism |
| 237 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 238 | |
| 239 friend class No_Alloc_Verifier; | |
| 240 friend class No_Safepoint_Verifier; | |
| 241 friend class Pause_No_Safepoint_Verifier; | |
| 242 friend class ThreadLocalStorage; | |
| 243 friend class GC_locker; | |
| 244 | |
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245 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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246 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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247 // the Java heap |
| 0 | 248 |
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249 int _vm_operation_started_count; // VM_Operation support |
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250 int _vm_operation_completed_count; // VM_Operation support |
| 0 | 251 |
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252 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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253 // is waiting to lock |
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254 bool _current_pending_monitor_is_from_java; // locking is from Java code |
| 0 | 255 |
| 256 // ObjectMonitor on which this thread called Object.wait() | |
| 257 ObjectMonitor* _current_waiting_monitor; | |
| 258 | |
| 259 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 260 public: | |
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261 ObjectMonitor* omFreeList; |
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262 int omFreeCount; // length of omFreeList |
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263 int omFreeProvision; // reload chunk size |
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264 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
| 1587 | 265 int omInUseCount; // length of omInUseList |
| 0 | 266 |
| 267 public: | |
| 268 enum { | |
| 269 is_definitely_current_thread = true | |
| 270 }; | |
| 271 | |
| 272 // Constructor | |
| 273 Thread(); | |
| 274 virtual ~Thread(); | |
| 275 | |
| 276 // initializtion | |
| 277 void initialize_thread_local_storage(); | |
| 278 | |
| 279 // thread entry point | |
| 280 virtual void run(); | |
| 281 | |
| 282 // Testers | |
| 283 virtual bool is_VM_thread() const { return false; } | |
| 284 virtual bool is_Java_thread() const { return false; } | |
| 285 virtual bool is_Compiler_thread() const { return false; } | |
| 286 virtual bool is_hidden_from_external_view() const { return false; } | |
| 287 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 288 // True iff the thread can perform GC operations at a safepoint. | |
| 289 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 290 // threads. | |
| 291 virtual bool is_GC_task_thread() const { return false; } | |
| 292 virtual bool is_Watcher_thread() const { return false; } | |
| 293 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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294 virtual bool is_Named_thread() const { return false; } |
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295 virtual bool is_Worker_thread() const { return false; } |
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296 |
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297 // Casts |
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298 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
| 0 | 299 |
| 300 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 301 | |
| 302 // Returns the current thread | |
| 303 static inline Thread* current(); | |
| 304 | |
| 305 // Common thread operations | |
| 306 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 307 static ThreadPriority get_priority(const Thread* const thread); | |
| 308 static void start(Thread* thread); | |
| 309 static void interrupt(Thread* thr); | |
| 310 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 311 | |
| 4006 | 312 void set_native_thread_name(const char *name) { |
| 313 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); | |
| 314 os::set_native_thread_name(name); | |
| 315 } | |
| 316 | |
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317 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
| 0 | 318 Monitor* SR_lock() const { return _SR_lock; } |
| 319 | |
| 320 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 321 | |
| 322 void set_suspend_flag(SuspendFlags f) { | |
| 323 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 324 uint32_t flags; | |
| 325 do { | |
| 326 flags = _suspend_flags; | |
| 327 } | |
| 328 while (Atomic::cmpxchg((jint)(flags | f), | |
| 329 (volatile jint*)&_suspend_flags, | |
| 330 (jint)flags) != (jint)flags); | |
| 331 } | |
| 332 void clear_suspend_flag(SuspendFlags f) { | |
| 333 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 334 uint32_t flags; | |
| 335 do { | |
| 336 flags = _suspend_flags; | |
| 337 } | |
| 338 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 339 (volatile jint*)&_suspend_flags, | |
| 340 (jint)flags) != (jint)flags); | |
| 341 } | |
| 342 | |
| 343 void set_has_async_exception() { | |
| 344 set_suspend_flag(_has_async_exception); | |
| 345 } | |
| 346 void clear_has_async_exception() { | |
| 347 clear_suspend_flag(_has_async_exception); | |
| 348 } | |
| 349 | |
| 350 // Support for Unhandled Oop detection | |
| 351 #ifdef CHECK_UNHANDLED_OOPS | |
| 352 private: | |
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353 UnhandledOops* _unhandled_oops; |
| 0 | 354 public: |
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355 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
| 0 | 356 // Mark oop safe for gc. It may be stack allocated but won't move. |
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357 void allow_unhandled_oop(oop *op) { |
| 0 | 358 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
| 359 } | |
| 360 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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361 void clear_unhandled_oops() { |
| 0 | 362 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
| 363 } | |
| 364 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 365 #endif // CHECK_UNHANDLED_OOPS | |
| 366 | |
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367 #ifndef PRODUCT |
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368 bool skip_gcalot() { return _skip_gcalot; } |
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369 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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370 #endif |
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371 |
| 0 | 372 public: |
| 373 // Installs a pending exception to be inserted later | |
| 374 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 375 | |
| 376 // Resource area | |
| 377 ResourceArea* resource_area() const { return _resource_area; } | |
| 378 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 379 | |
| 380 OSThread* osthread() const { return _osthread; } | |
| 381 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 382 | |
| 383 // JNI handle support | |
| 384 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 385 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 386 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 387 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 388 | |
| 389 // Internal handle support | |
| 390 HandleArea* handle_area() const { return _handle_area; } | |
| 391 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 392 | |
| 393 // Thread-Local Allocation Buffer (TLAB) support | |
| 394 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 395 void initialize_tlab() { | |
| 396 if (UseTLAB) { | |
| 397 tlab().initialize(); | |
| 398 } | |
| 399 } | |
| 400 | |
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401 jlong allocated_bytes() { return _allocated_bytes; } |
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402 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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403 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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404 jlong cooked_allocated_bytes() { |
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405 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); |
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406 if (UseTLAB) { |
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407 size_t used_bytes = tlab().used_bytes(); |
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408 if ((ssize_t)used_bytes > 0) { |
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409 // More-or-less valid tlab. The load_acquire above should ensure |
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410 // that the result of the add is <= the instantaneous value |
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411 return allocated_bytes + used_bytes; |
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412 } |
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413 } |
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414 return allocated_bytes; |
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415 } |
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416 |
| 0 | 417 // VM operation support |
| 418 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 419 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 420 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 421 | |
| 422 // For tracking the heavyweight monitor the thread is pending on. | |
| 423 ObjectMonitor* current_pending_monitor() { | |
| 424 return _current_pending_monitor; | |
| 425 } | |
| 426 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 427 _current_pending_monitor = monitor; | |
| 428 } | |
| 429 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 430 _current_pending_monitor_is_from_java = from_java; | |
| 431 } | |
| 432 bool current_pending_monitor_is_from_java() { | |
| 433 return _current_pending_monitor_is_from_java; | |
| 434 } | |
| 435 | |
| 436 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 437 ObjectMonitor* current_waiting_monitor() { | |
| 438 return _current_waiting_monitor; | |
| 439 } | |
| 440 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 441 _current_waiting_monitor = monitor; | |
| 442 } | |
| 443 | |
| 444 // GC support | |
| 445 // Apply "f->do_oop" to all root oops in "this". | |
|
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446 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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447 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 448 |
| 449 // Handles the parallel case for the method below. | |
| 450 private: | |
| 451 bool claim_oops_do_par_case(int collection_parity); | |
| 452 public: | |
| 453 // Requires that "collection_parity" is that of the current strong roots | |
| 454 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 455 // "collection_parity", and returns "true". If "is_par" is true, | |
| 456 // uses an atomic instruction to set the current threads parity to | |
| 457 // "collection_parity", if it is not already. Returns "true" iff the | |
| 458 // calling thread does the update, this indicates that the calling thread | |
| 459 // has claimed the thread's stack as a root groop in the current | |
| 460 // collection. | |
| 461 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 462 if (!is_par) { | |
| 463 _oops_do_parity = collection_parity; | |
| 464 return true; | |
| 465 } else { | |
| 466 return claim_oops_do_par_case(collection_parity); | |
| 467 } | |
| 468 } | |
| 469 | |
| 470 // Sweeper support | |
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471 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 472 |
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473 // Used by fast lock support |
| 0 | 474 virtual bool is_lock_owned(address adr) const; |
| 475 | |
| 476 // Check if address is in the stack of the thread (not just for locks). | |
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477 // Warning: the method can only be used on the running thread |
| 0 | 478 bool is_in_stack(address adr) const; |
| 479 | |
| 480 // Sets this thread as starting thread. Returns failure if thread | |
| 481 // creation fails due to lack of memory, too many threads etc. | |
| 482 bool set_as_starting_thread(); | |
| 483 | |
| 484 protected: | |
| 485 // OS data associated with the thread | |
| 486 OSThread* _osthread; // Platform-specific thread information | |
| 487 | |
| 488 // Thread local resource area for temporary allocation within the VM | |
| 489 ResourceArea* _resource_area; | |
| 490 | |
| 491 // Thread local handle area for allocation of handles within the VM | |
| 492 HandleArea* _handle_area; | |
| 493 | |
| 494 // Support for stack overflow handling, get_thread, etc. | |
| 495 address _stack_base; | |
| 496 size_t _stack_size; | |
| 497 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 498 int _lgrp_id; | |
| 499 | |
| 500 public: | |
| 501 // Stack overflow support | |
| 502 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 503 | |
| 504 void set_stack_base(address base) { _stack_base = base; } | |
| 505 size_t stack_size() const { return _stack_size; } | |
| 506 void set_stack_size(size_t size) { _stack_size = size; } | |
| 507 void record_stack_base_and_size(); | |
| 508 | |
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509 bool on_local_stack(address adr) const { |
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510 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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511 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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512 } |
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513 |
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514 uintptr_t self_raw_id() { return _self_raw_id; } |
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515 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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516 |
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517 int lgrp_id() const { return _lgrp_id; } |
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518 void set_lgrp_id(int value) { _lgrp_id = value; } |
| 0 | 519 |
| 520 // Printing | |
| 521 void print_on(outputStream* st) const; | |
| 522 void print() const { print_on(tty); } | |
| 523 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 524 | |
| 525 // Debug-only code | |
| 526 | |
| 527 #ifdef ASSERT | |
| 528 private: | |
| 529 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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530 Monitor* _owned_locks; |
| 0 | 531 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
| 532 // thus the friendship | |
| 533 friend class Mutex; | |
| 534 friend class Monitor; | |
| 535 | |
| 536 public: | |
| 537 void print_owned_locks_on(outputStream* st) const; | |
| 538 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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539 Monitor* owned_locks() const { return _owned_locks; } |
| 0 | 540 bool owns_locks() const { return owned_locks() != NULL; } |
| 541 bool owns_locks_but_compiled_lock() const; | |
| 542 | |
| 543 // Deadlock detection | |
| 544 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 545 #endif | |
| 546 | |
| 547 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 548 | |
| 549 private: | |
| 550 volatile int _jvmti_env_iteration_count; | |
| 551 | |
| 552 public: | |
| 553 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 554 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 555 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 556 | |
| 557 // Code generation | |
| 558 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 559 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 560 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 561 | |
| 562 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 563 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 564 | |
| 565 #define TLAB_FIELD_OFFSET(name) \ | |
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566 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
| 0 | 567 |
| 568 TLAB_FIELD_OFFSET(start) | |
| 569 TLAB_FIELD_OFFSET(end) | |
| 570 TLAB_FIELD_OFFSET(top) | |
| 571 TLAB_FIELD_OFFSET(pf_top) | |
| 572 TLAB_FIELD_OFFSET(size) // desired_size | |
| 573 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 574 TLAB_FIELD_OFFSET(number_of_refills) | |
| 575 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 576 TLAB_FIELD_OFFSET(slow_allocations) | |
| 577 | |
| 578 #undef TLAB_FIELD_OFFSET | |
| 579 | |
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580 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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581 |
| 0 | 582 public: |
| 583 volatile intptr_t _Stalled ; | |
| 584 volatile int _TypeTag ; | |
| 585 ParkEvent * _ParkEvent ; // for synchronized() | |
| 586 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 587 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 588 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 589 int NativeSyncRecursion ; // diagnostic | |
| 590 | |
| 591 volatile int _OnTrap ; // Resume-at IP delta | |
| 592 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 593 jint _hashStateX ; // thread-specific hashCode generator state | |
| 594 jint _hashStateY ; | |
| 595 jint _hashStateZ ; | |
| 596 void * _schedctl ; | |
| 597 | |
| 598 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 599 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 600 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 601 | |
| 602 volatile jint rng [4] ; // RNG for spin loop | |
| 603 | |
| 604 // Low-level leaf-lock primitives used to implement synchronization | |
| 605 // and native monitor-mutex infrastructure. | |
| 606 // Not for general synchronization use. | |
| 607 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 608 static void SpinRelease (volatile int * Lock) ; | |
| 609 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 610 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 611 static void muxRelease (volatile intptr_t * Lock) ; | |
| 612 }; | |
| 613 | |
| 614 // Inline implementation of Thread::current() | |
| 615 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 616 // startup. | |
| 617 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 618 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 619 | |
| 620 inline Thread* Thread::current() { | |
| 621 #ifdef ASSERT | |
| 622 // This function is very high traffic. Define PARANOID to enable expensive | |
| 623 // asserts. | |
| 624 #ifdef PARANOID | |
| 625 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 626 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 627 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 628 "Don't use Thread::current() inside signal handler"); | |
| 629 #endif | |
| 630 #endif | |
| 631 Thread* thread = ThreadLocalStorage::thread(); | |
| 632 assert(thread != NULL, "just checking"); | |
| 633 return thread; | |
| 634 } | |
| 635 | |
| 636 // Name support for threads. non-JavaThread subclasses with multiple | |
| 637 // uniquely named instances should derive from this. | |
| 638 class NamedThread: public Thread { | |
| 639 friend class VMStructs; | |
| 640 enum { | |
| 641 max_name_len = 64 | |
| 642 }; | |
| 643 private: | |
| 644 char* _name; | |
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645 // log JavaThread being processed by oops_do |
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646 JavaThread* _processed_thread; |
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647 |
| 0 | 648 public: |
| 649 NamedThread(); | |
| 650 ~NamedThread(); | |
| 651 // May only be called once per thread. | |
| 652 void set_name(const char* format, ...); | |
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653 virtual bool is_Named_thread() const { return true; } |
| 0 | 654 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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655 JavaThread *processed_thread() { return _processed_thread; } |
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656 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 657 }; |
| 658 | |
| 659 // Worker threads are named and have an id of an assigned work. | |
| 660 class WorkerThread: public NamedThread { | |
| 661 private: | |
| 662 uint _id; | |
| 663 public: | |
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664 WorkerThread() : _id(0) { } |
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665 virtual bool is_Worker_thread() const { return true; } |
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666 |
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667 virtual WorkerThread* as_Worker_thread() const { |
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668 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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669 return (WorkerThread*) this; |
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670 } |
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671 |
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672 void set_id(uint work_id) { _id = work_id; } |
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673 uint id() const { return _id; } |
| 0 | 674 }; |
| 675 | |
| 676 // A single WatcherThread is used for simulating timer interrupts. | |
| 677 class WatcherThread: public Thread { | |
| 678 friend class VMStructs; | |
| 679 public: | |
| 680 virtual void run(); | |
| 681 | |
| 682 private: | |
| 683 static WatcherThread* _watcher_thread; | |
| 684 | |
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685 volatile static bool _should_terminate; // updated without holding lock |
| 0 | 686 public: |
| 687 enum SomeConstants { | |
| 688 delay_interval = 10 // interrupt delay in milliseconds | |
| 689 }; | |
| 690 | |
| 691 // Constructor | |
| 692 WatcherThread(); | |
| 693 | |
| 694 // Tester | |
| 695 bool is_Watcher_thread() const { return true; } | |
| 696 | |
| 697 // Printing | |
| 698 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 699 void print_on(outputStream* st) const; | |
| 700 void print() const { print_on(tty); } | |
| 701 | |
| 702 // Returns the single instance of WatcherThread | |
| 703 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 704 | |
| 705 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 706 static void start(); | |
| 707 static void stop(); | |
| 708 }; | |
| 709 | |
| 710 | |
| 711 class CompilerThread; | |
| 712 | |
| 713 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 714 | |
| 715 class JavaThread: public Thread { | |
| 716 friend class VMStructs; | |
| 717 private: | |
| 718 JavaThread* _next; // The next thread in the Threads list | |
| 719 oop _threadObj; // The Java level thread object | |
| 720 | |
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721 // (tw) Necessary for holding a compilation buffer and ci environment. Moved from CompilerThread to JavaThread in order to enable code installation from Java application code. |
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722 BufferBlob* _buffer_blob; |
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723 ciEnv* _env; |
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724 bool _is_compiling; |
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725 |
| 0 | 726 #ifdef ASSERT |
| 727 private: | |
| 728 int _java_call_counter; | |
| 729 | |
| 730 public: | |
| 731 int java_call_counter() { return _java_call_counter; } | |
| 732 void inc_java_call_counter() { _java_call_counter++; } | |
| 733 void dec_java_call_counter() { | |
| 734 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 735 _java_call_counter--; | |
| 736 } | |
| 737 private: // restore original namespace restriction | |
| 738 #endif // ifdef ASSERT | |
| 739 | |
| 740 #ifndef PRODUCT | |
| 741 public: | |
| 742 enum { | |
| 743 jump_ring_buffer_size = 16 | |
| 744 }; | |
| 745 private: // restore original namespace restriction | |
| 746 #endif | |
| 747 | |
| 748 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 749 | |
| 750 ThreadFunction _entry_point; | |
| 751 | |
| 752 JNIEnv _jni_environment; | |
| 753 | |
| 754 // Deopt support | |
| 755 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 756 | |
| 757 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 758 // transition out of native | |
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759 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
| 0 | 760 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| 761 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 762 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 763 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 764 // This holds the pointer to array (yeah like there might be more than one) of | |
| 765 // description of compiled vframes that have locals that need to be updated. | |
| 766 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 767 | |
| 768 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 769 // adapter to store the callee methodOop. This value is NEVER live | |
| 770 // across a gc point so it does NOT have to be gc'd | |
| 771 // The handshake is open ended since we can't be certain that it will | |
| 772 // be NULLed. This is because we rarely ever see the race and end up | |
| 773 // in handle_wrong_method which is the backend of the handshake. See | |
| 774 // code in i2c adapters and handle_wrong_method. | |
| 775 | |
| 776 methodOop _callee_target; | |
| 777 | |
| 778 // Oop results of VM runtime calls | |
|
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779 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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780 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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781 |
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782 // See ReduceInitialCardMarks: this holds the precise space interval of |
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783 // the most recent slow path allocation for which compiled code has |
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784 // elided card-marks for performance along the fast-path. |
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785 MemRegion _deferred_card_mark; |
| 0 | 786 |
| 787 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 788 // allocated during deoptimization | |
| 789 // and by JNI_MonitorEnter/Exit | |
| 790 | |
| 791 // Async. requests support | |
| 792 enum AsyncRequests { | |
| 793 _no_async_condition = 0, | |
| 794 _async_exception, | |
| 795 _async_unsafe_access_error | |
| 796 }; | |
| 797 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 798 oop _pending_async_exception; | |
| 799 | |
| 800 // Safepoint support | |
| 801 public: // Expose _thread_state for SafeFetchInt() | |
| 802 volatile JavaThreadState _thread_state; | |
| 803 private: | |
| 804 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 805 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 806 | |
| 807 // JavaThread termination support | |
| 808 enum TerminatedTypes { | |
| 809 _not_terminated = 0xDEAD - 2, | |
| 810 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 811 _thread_terminated, // JavaThread is removed from thread list | |
| 812 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 813 // only VM_Exit can set _vm_exited | |
| 814 }; | |
| 815 | |
| 816 // In general a JavaThread's _terminated field transitions as follows: | |
| 817 // | |
| 818 // _not_terminated => _thread_exiting => _thread_terminated | |
| 819 // | |
| 820 // _vm_exited is a special value to cover the case of a JavaThread | |
| 821 // executing native code after the VM itself is terminated. | |
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822 volatile TerminatedTypes _terminated; |
| 0 | 823 // suspend/resume support |
| 824 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 825 jint _in_deopt_handler; // count of deoptimization | |
| 826 // handlers thread is in | |
| 827 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 828 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 829 // never locked) when throwing an exception. Used by interpreter only. | |
| 830 | |
| 4006 | 831 // JNI attach states: |
| 832 enum JNIAttachStates { | |
| 833 _not_attaching_via_jni = 1, // thread is not attaching via JNI | |
| 834 _attaching_via_jni, // thread is attaching via JNI | |
| 835 _attached_via_jni // thread has attached via JNI | |
| 836 }; | |
| 837 | |
| 838 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. | |
| 839 // A native thread that is attaching via JNI starts with a value | |
| 840 // of _attaching_via_jni and transitions to _attached_via_jni. | |
| 841 volatile JNIAttachStates _jni_attach_state; | |
| 0 | 842 |
| 843 public: | |
| 844 // State of the stack guard pages for this thread. | |
| 845 enum StackGuardState { | |
| 846 stack_guard_unused, // not needed | |
| 847 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 848 stack_guard_enabled // enabled | |
| 849 }; | |
| 850 | |
| 851 private: | |
| 852 | |
|
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853 // graal needs some place to put the dimensions |
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854 jint graal_multinewarray_storage[256]; |
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855 |
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856 volatile oop _graal_deopt_info; |
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857 |
| 0 | 858 StackGuardState _stack_guard_state; |
| 859 | |
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860 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper |
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861 |
| 0 | 862 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is |
| 863 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 864 // code) | |
| 865 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 866 volatile address _exception_pc; // PC where exception happened | |
| 867 volatile address _exception_handler_pc; // PC for handler of exception | |
|
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868 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 869 |
| 870 // support for JNI critical regions | |
| 871 jint _jni_active_critical; // count of entries into JNI critical region | |
| 872 | |
| 873 // For deadlock detection. | |
| 874 int _depth_first_number; | |
| 875 | |
| 876 // JVMTI PopFrame support | |
| 877 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 878 int _popframe_condition; | |
| 879 | |
| 880 #ifndef PRODUCT | |
| 881 int _jmp_ring_index; | |
| 882 struct { | |
| 883 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 884 intptr_t _target; | |
| 885 intptr_t _instruction; | |
| 886 const char* _file; | |
| 887 int _line; | |
| 888 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 889 #endif /* PRODUCT */ | |
| 890 | |
| 342 | 891 #ifndef SERIALGC |
| 892 // Support for G1 barriers | |
| 893 | |
| 894 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 895 // Set of all such queues. | |
| 896 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 897 | |
| 898 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 899 // Set of all such queues. | |
| 900 static DirtyCardQueueSet _dirty_card_queue_set; | |
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901 |
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902 void flush_barrier_queues(); |
| 342 | 903 #endif // !SERIALGC |
| 904 | |
| 0 | 905 friend class VMThread; |
| 906 friend class ThreadWaitTransition; | |
| 907 friend class VM_Exit; | |
| 908 | |
| 909 void initialize(); // Initialized the instance variables | |
| 910 | |
| 911 public: | |
| 912 // Constructor | |
| 4006 | 913 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads |
| 0 | 914 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
| 915 ~JavaThread(); | |
| 916 | |
| 917 #ifdef ASSERT | |
| 918 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 919 void verify_not_published(); | |
| 920 #endif | |
| 921 | |
| 922 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 923 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 924 _jni_environment.functions = functionTable; | |
| 925 } | |
| 926 struct JNINativeInterface_* get_jni_functions() { | |
| 927 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 928 } | |
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929 |
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930 bool is_compiling() const { return _is_compiling; } |
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931 void set_compiling(bool b) { _is_compiling = b; } |
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932 |
|
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933 // Get/set the thread's compilation environment. |
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934 ciEnv* env() { return _env; } |
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935 void set_env(ciEnv* env) { _env = env; } |
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936 |
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937 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
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938 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; |
| 0 | 939 |
|
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940 // This function is called at thread creation to allow |
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941 // platform specific thread variables to be initialized. |
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942 void cache_global_variables(); |
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943 |
| 0 | 944 // Executes Shutdown.shutdown() |
| 945 void invoke_shutdown_hooks(); | |
| 946 | |
| 947 // Cleanup on thread exit | |
| 948 enum ExitType { | |
| 949 normal_exit, | |
| 950 jni_detach | |
| 951 }; | |
| 952 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 953 | |
| 954 void cleanup_failed_attach_current_thread(); | |
| 955 | |
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956 // Track the nmethod currently being scanned by the sweeper |
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957 void set_scanned_nmethod(nmethod* nm) { |
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958 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); |
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959 _scanned_nmethod = nm; |
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960 } |
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|
961 |
| 0 | 962 // Testers |
| 963 virtual bool is_Java_thread() const { return true; } | |
| 964 | |
| 965 // Thread chain operations | |
| 966 JavaThread* next() const { return _next; } | |
| 967 void set_next(JavaThread* p) { _next = p; } | |
| 968 | |
| 969 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 970 // (or for threads attached via JNI) | |
| 971 oop threadObj() const { return _threadObj; } | |
| 972 void set_threadObj(oop p) { _threadObj = p; } | |
| 973 | |
| 974 ThreadPriority java_priority() const; // Read from threadObj() | |
| 975 | |
| 976 // Prepare thread and add to priority queue. If a priority is | |
| 977 // not specified, use the priority of the thread object. Threads_lock | |
| 978 // must be held while this function is called. | |
| 979 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 980 | |
| 981 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 982 address saved_exception_pc() { return _saved_exception_pc; } | |
| 983 | |
| 984 | |
| 985 ThreadFunction entry_point() const { return _entry_point; } | |
| 986 | |
| 987 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 988 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 989 | |
| 990 // Last frame anchor routines | |
| 991 | |
| 992 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 993 | |
| 994 // last_Java_sp | |
| 995 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 996 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 997 | |
| 998 // last_Java_pc | |
| 999 | |
| 1000 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 1001 | |
| 1002 // Safepoint support | |
| 1003 JavaThreadState thread_state() const { return _thread_state; } | |
| 1004 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 1005 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 1006 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 1007 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 1008 | |
| 1009 // thread has called JavaThread::exit() or is terminated | |
| 1010 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 1011 // thread is terminated (no longer on the threads list); we compare | |
| 1012 // against the two non-terminated values so that a freed JavaThread | |
| 1013 // will also be considered terminated. | |
| 1014 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 1015 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 1016 // special for Threads::remove() which is static: | |
| 1017 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 1018 void block_if_vm_exited(); | |
| 1019 | |
| 1020 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 1021 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 1022 | |
| 1023 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 1024 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 1025 | |
| 1026 | |
| 1027 // Suspend/resume support for JavaThread | |
| 1028 | |
| 1029 private: | |
| 1030 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 1031 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 1032 | |
| 1033 public: | |
| 1034 void java_suspend(); | |
| 1035 void java_resume(); | |
| 1036 int java_suspend_self(); | |
| 1037 | |
| 1038 void check_and_wait_while_suspended() { | |
| 1039 assert(JavaThread::current() == this, "sanity check"); | |
| 1040 | |
| 1041 bool do_self_suspend; | |
| 1042 do { | |
| 1043 // were we externally suspended while we were waiting? | |
| 1044 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 1045 if (do_self_suspend) { | |
| 1046 // don't surprise the thread that suspended us by returning | |
| 1047 java_suspend_self(); | |
| 1048 set_suspend_equivalent(); | |
| 1049 } | |
| 1050 } while (do_self_suspend); | |
| 1051 } | |
| 1052 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 1053 // Check for async exception in addition to safepoint and suspend request. | |
| 1054 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 1055 | |
| 1056 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
| 1057 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 1058 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1059 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1060 // SR_lock to allow the thread to reach a stable thread state if | |
| 1061 // it is currently in a transient thread state. | |
| 1062 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 1063 SuspendRetryDelay, bits); | |
| 1064 } | |
| 1065 | |
| 1066 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 1067 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 1068 // passed as the count and delay parameters. Experiments with specific | |
| 1069 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 1070 // other values in the code. Experiments with all calls can be done | |
| 1071 // via the appropriate -XX options. | |
| 1072 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 1073 | |
| 1074 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 1075 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 1076 | |
| 1077 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 1078 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 1079 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 1080 | |
| 1081 bool is_external_suspend() const { | |
| 1082 return (_suspend_flags & _external_suspend) != 0; | |
| 1083 } | |
| 1084 // Whenever a thread transitions from native to vm/java it must suspend | |
| 1085 // if external|deopt suspend is present. | |
| 1086 bool is_suspend_after_native() const { | |
| 1087 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 1088 } | |
| 1089 | |
| 1090 // external suspend request is completed | |
| 1091 bool is_ext_suspended() const { | |
| 1092 return (_suspend_flags & _ext_suspended) != 0; | |
| 1093 } | |
| 1094 | |
| 1095 bool is_external_suspend_with_lock() const { | |
| 1096 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1097 return is_external_suspend(); | |
| 1098 } | |
| 1099 | |
| 1100 // Special method to handle a pending external suspend request | |
| 1101 // when a suspend equivalent condition lifts. | |
| 1102 bool handle_special_suspend_equivalent_condition() { | |
| 1103 assert(is_suspend_equivalent(), | |
| 1104 "should only be called in a suspend equivalence condition"); | |
| 1105 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1106 bool ret = is_external_suspend(); | |
| 1107 if (!ret) { | |
| 1108 // not about to self-suspend so clear suspend equivalence | |
| 1109 clear_suspend_equivalent(); | |
| 1110 } | |
| 1111 // implied else: | |
| 1112 // We have a pending external suspend request so we leave the | |
| 1113 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1114 // the ext_suspended flag and clears the suspend_equivalent | |
| 1115 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1116 // will return consistent values. | |
| 1117 return ret; | |
| 1118 } | |
| 1119 | |
| 1120 // utility methods to see if we are doing some kind of suspension | |
| 1121 bool is_being_ext_suspended() const { | |
| 1122 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1123 return is_ext_suspended() || is_external_suspend(); | |
| 1124 } | |
| 1125 | |
| 1126 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1127 | |
| 1128 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1129 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1130 | |
| 1131 // Thread.stop support | |
| 1132 void send_thread_stop(oop throwable); | |
| 1133 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1134 AsyncRequests x = _special_runtime_exit_condition; | |
| 1135 _special_runtime_exit_condition = _no_async_condition; | |
| 1136 return x; | |
| 1137 } | |
| 1138 | |
| 1139 // Are any async conditions present? | |
| 1140 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1141 | |
| 1142 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1143 | |
| 1144 // these next two are also used for self-suspension and async exception support | |
| 1145 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1146 | |
| 1147 // Return true if JavaThread has an asynchronous condition or | |
| 1148 // if external suspension is requested. | |
| 1149 bool has_special_runtime_exit_condition() { | |
| 1150 // We call is_external_suspend() last since external suspend should | |
| 1151 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1152 // it is possible that we won't see an asynchronous external suspend | |
| 1153 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1154 // _external_suspend field change either not made yet or not visible | |
| 1155 // yet. However, this is okay because the request is asynchronous and | |
| 1156 // we will see the new flag value the next time through. It's also | |
| 1157 // possible that the external suspend request is dropped after | |
| 1158 // we have checked is_external_suspend(), we will recheck its value | |
| 1159 // under SR_lock in java_suspend_self(). | |
| 1160 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1161 is_external_suspend() || is_deopt_suspend(); | |
| 1162 } | |
| 1163 | |
| 1164 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1165 | |
| 1166 void set_pending_async_exception(oop e) { | |
| 1167 _pending_async_exception = e; | |
| 1168 _special_runtime_exit_condition = _async_exception; | |
| 1169 set_has_async_exception(); | |
| 1170 } | |
| 1171 | |
| 1172 // Fast-locking support | |
| 1173 bool is_lock_owned(address adr) const; | |
| 1174 | |
| 1175 // Accessors for vframe array top | |
| 1176 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1177 // unpack the head must contain the vframe array to unpack. | |
| 1178 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1179 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1180 | |
| 1181 // Side structure for defering update of java frame locals until deopt occurs | |
| 1182 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1183 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1184 | |
| 1185 // These only really exist to make debugging deopt problems simpler | |
| 1186 | |
| 1187 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1188 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1189 | |
| 1190 // The special resourceMark used during deoptimization | |
| 1191 | |
| 1192 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1193 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1194 | |
| 1195 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1196 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1197 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1198 | |
|
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1199 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1200 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1201 |
| 0 | 1202 methodOop callee_target() const { return _callee_target; } |
| 1203 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1204 | |
| 1205 // Oop results of vm runtime calls | |
| 1206 oop vm_result() const { return _vm_result; } | |
| 1207 void set_vm_result (oop x) { _vm_result = x; } | |
| 1208 | |
| 1209 oop vm_result_2() const { return _vm_result_2; } | |
| 1210 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1211 | |
|
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1212 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1213 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1214 |
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1215 oop graal_deopt_info() const { return _graal_deopt_info; } |
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1216 void set_graal_deopt_info(oop o) { _graal_deopt_info = o; } |
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1217 |
| 0 | 1218 // Exception handling for compiled methods |
| 1219 oop exception_oop() const { return _exception_oop; } | |
| 1220 address exception_pc() const { return _exception_pc; } | |
| 1221 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1222 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1223 |
| 1224 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1225 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1226 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
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1227 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1228 |
| 1229 // Stack overflow support | |
| 1230 inline size_t stack_available(address cur_sp); | |
| 1231 address stack_yellow_zone_base() | |
| 1232 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1233 size_t stack_yellow_zone_size() | |
| 1234 { return StackYellowPages * os::vm_page_size(); } | |
| 1235 address stack_red_zone_base() | |
| 1236 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1237 size_t stack_red_zone_size() | |
| 1238 { return StackRedPages * os::vm_page_size(); } | |
| 1239 bool in_stack_yellow_zone(address a) | |
| 1240 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1241 bool in_stack_red_zone(address a) | |
| 1242 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1243 | |
| 1244 void create_stack_guard_pages(); | |
| 1245 void remove_stack_guard_pages(); | |
| 1246 | |
| 1247 void enable_stack_yellow_zone(); | |
| 1248 void disable_stack_yellow_zone(); | |
| 1249 void enable_stack_red_zone(); | |
| 1250 void disable_stack_red_zone(); | |
| 1251 | |
| 1252 inline bool stack_yellow_zone_disabled(); | |
| 1253 inline bool stack_yellow_zone_enabled(); | |
| 1254 | |
| 1255 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1256 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1257 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1258 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1259 // which case the caller should unwind a frame and try again. The argument | |
| 1260 // should be the caller's (approximate) sp. | |
| 1261 bool reguard_stack(address cur_sp); | |
| 1262 // Similar to above but see if current stackpoint is out of the guard area | |
| 1263 // and reguard if possible. | |
| 1264 bool reguard_stack(void); | |
| 1265 | |
| 1266 // Misc. accessors/mutators | |
| 1267 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1268 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1269 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1270 | |
| 1271 #ifndef PRODUCT | |
| 1272 void record_jump(address target, address instr, const char* file, int line); | |
| 1273 #endif /* PRODUCT */ | |
| 1274 | |
| 1275 // For assembly stub generation | |
| 1276 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1277 #ifndef PRODUCT | |
| 1278 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1279 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1280 #endif /* PRODUCT */ | |
| 1281 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1282 static ByteSize last_Java_sp_offset() { | |
| 1283 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1284 } | |
| 1285 static ByteSize last_Java_pc_offset() { | |
| 1286 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1287 } | |
| 1288 static ByteSize frame_anchor_offset() { | |
| 1289 return byte_offset_of(JavaThread, _anchor); | |
| 1290 } | |
| 1291 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1292 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1293 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1294 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1295 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1296 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
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1297 static ByteSize graal_deopt_info_offset() { return byte_offset_of(JavaThread, _graal_deopt_info ); } |
| 0 | 1298 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } |
| 1299 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1300 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
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1301 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1302 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1303 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
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1304 static ByteSize graal_multinewarray_storage_offset() { return byte_offset_of(JavaThread, graal_multinewarray_storage); } |
| 0 | 1305 |
| 1306 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1307 static ByteSize should_post_on_exceptions_flag_offset() { |
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1308 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1309 } |
| 0 | 1310 |
| 342 | 1311 #ifndef SERIALGC |
| 1312 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1313 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1314 #endif // !SERIALGC | |
| 1315 | |
| 0 | 1316 // Returns the jni environment for this thread |
| 1317 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1318 | |
| 1319 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1320 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1321 // Only return NULL if thread is off the thread list; starting to | |
| 1322 // exit should not return NULL. | |
| 1323 if (thread_from_jni_env->is_terminated()) { | |
| 1324 thread_from_jni_env->block_if_vm_exited(); | |
| 1325 return NULL; | |
| 1326 } else { | |
| 1327 return thread_from_jni_env; | |
| 1328 } | |
| 1329 } | |
| 1330 | |
| 1331 // JNI critical regions. These can nest. | |
| 1332 bool in_critical() { return _jni_active_critical > 0; } | |
| 1333 void enter_critical() { assert(Thread::current() == this, | |
| 1334 "this must be current thread"); | |
| 1335 _jni_active_critical++; } | |
| 1336 void exit_critical() { assert(Thread::current() == this, | |
| 1337 "this must be current thread"); | |
| 1338 _jni_active_critical--; | |
| 1339 assert(_jni_active_critical >= 0, | |
| 1340 "JNI critical nesting problem?"); } | |
| 1341 | |
| 1342 // For deadlock detection | |
| 1343 int depth_first_number() { return _depth_first_number; } | |
| 1344 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1345 | |
| 1346 private: | |
| 1347 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1348 | |
| 1349 public: | |
| 1350 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1351 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1352 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1353 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1354 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1355 void dec_in_deopt_handler() { | |
| 1356 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1357 if (_in_deopt_handler > 0) { // robustness | |
| 1358 _in_deopt_handler--; | |
| 1359 } | |
| 1360 } | |
| 1361 | |
| 1362 private: | |
| 1363 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1364 | |
| 1365 public: | |
| 1366 | |
| 1367 // Frame iteration; calls the function f for all frames on the stack | |
| 1368 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1369 | |
| 1370 // Memory operations | |
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1371 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1372 |
| 1373 // Sweeper operations | |
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1374 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1375 |
| 1376 // Memory management operations | |
| 1377 void gc_epilogue(); | |
| 1378 void gc_prologue(); | |
| 1379 | |
| 1380 // Misc. operations | |
| 1381 char* name() const { return (char*)get_thread_name(); } | |
| 1382 void print_on(outputStream* st) const; | |
| 1383 void print() const { print_on(tty); } | |
| 1384 void print_value(); | |
| 1385 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1386 void print_thread_state() const PRODUCT_RETURN; | |
| 1387 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1388 void verify(); | |
| 1389 const char* get_thread_name() const; | |
| 1390 private: | |
| 1391 // factor out low-level mechanics for use in both normal and error cases | |
| 1392 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1393 public: | |
| 1394 const char* get_threadgroup_name() const; | |
| 1395 const char* get_parent_name() const; | |
| 1396 | |
| 1397 // Accessing frames | |
| 1398 frame last_frame() { | |
| 1399 _anchor.make_walkable(this); | |
| 1400 return pd_last_frame(); | |
| 1401 } | |
| 1402 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1403 | |
| 1404 // Returns method at 'depth' java or native frames down the stack | |
| 1405 // Used for security checks | |
| 1406 klassOop security_get_caller_class(int depth); | |
| 1407 | |
| 1408 // Print stack trace in external format | |
| 1409 void print_stack_on(outputStream* st); | |
| 1410 void print_stack() { print_stack_on(tty); } | |
| 1411 | |
| 1412 // Print stack traces in various internal formats | |
| 1413 void trace_stack() PRODUCT_RETURN; | |
| 1414 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1415 void trace_frames() PRODUCT_RETURN; | |
|
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1416 void trace_oops() PRODUCT_RETURN; |
| 0 | 1417 |
|
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1418 // Print an annotated view of the stack frames |
|
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1419 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
|
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1420 void validate_frame_layout() { |
|
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1421 print_frame_layout(0, true); |
|
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|
1422 } |
|
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|
1423 |
| 0 | 1424 // Returns the number of stack frames on the stack |
| 1425 int depth() const; | |
| 1426 | |
| 1427 // Function for testing deoptimization | |
| 1428 void deoptimize(); | |
| 1429 void make_zombies(); | |
| 1430 | |
| 1431 void deoptimized_wrt_marked_nmethods(); | |
| 1432 | |
| 1433 // Profiling operation (see fprofile.cpp) | |
| 1434 public: | |
| 1435 bool profile_last_Java_frame(frame* fr); | |
| 1436 | |
| 1437 private: | |
| 1438 ThreadProfiler* _thread_profiler; | |
| 1439 private: | |
| 1440 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1441 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1442 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1443 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1444 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1445 ThreadProfiler* result = _thread_profiler; | |
| 1446 _thread_profiler = tp; | |
| 1447 return result; | |
| 1448 } | |
| 1449 | |
| 1450 // Static operations | |
| 1451 public: | |
| 1452 // Returns the running thread as a JavaThread | |
| 1453 static inline JavaThread* current(); | |
| 1454 | |
| 1455 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1456 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1457 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1458 // operation. You may not want that either. | |
| 1459 static JavaThread* active(); | |
| 1460 | |
| 1461 inline CompilerThread* as_CompilerThread(); | |
| 1462 | |
| 1463 public: | |
| 1464 virtual void run(); | |
| 1465 void thread_main_inner(); | |
| 1466 | |
| 1467 private: | |
| 1468 // PRIVILEGED STACK | |
| 1469 PrivilegedElement* _privileged_stack_top; | |
| 1470 GrowableArray<oop>* _array_for_gc; | |
| 1471 public: | |
| 1472 | |
| 1473 // Returns the privileged_stack information. | |
| 1474 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1475 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1476 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1477 | |
| 1478 public: | |
| 1479 // Thread local information maintained by JVMTI. | |
| 1480 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1481 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
|
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1482 // getter is used to get this JavaThread's JvmtiThreadState if it has |
|
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1483 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1484 // is used to get the specified JavaThread's JvmtiThreadState if it has |
|
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1485 // one or it allocates a new JvmtiThreadState for the JavaThread and |
|
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1486 // returns it. JvmtiThreadState::state_for() will return NULL only if |
|
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|
1487 // the specified JavaThread is exiting. |
| 0 | 1488 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1489 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1490 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1491 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1492 | |
| 1493 // JVMTI PopFrame support | |
| 1494 // Setting and clearing popframe_condition | |
| 1495 // All of these enumerated values are bits. popframe_pending | |
| 1496 // indicates that a PopFrame() has been requested and not yet been | |
| 1497 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1498 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1499 // indicates that special handling is required when returning to a | |
| 1500 // deoptimized caller. | |
| 1501 enum PopCondition { | |
| 1502 popframe_inactive = 0x00, | |
| 1503 popframe_pending_bit = 0x01, | |
| 1504 popframe_processing_bit = 0x02, | |
| 1505 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1506 }; | |
| 1507 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1508 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1509 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1510 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1511 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1512 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1513 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1514 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1515 #ifdef CC_INTERP | |
| 1516 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1517 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1518 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1519 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1520 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1521 #endif | |
| 1522 | |
| 1523 private: | |
| 1524 // Saved incoming arguments to popped frame. | |
| 1525 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1526 void* _popframe_preserved_args; | |
| 1527 int _popframe_preserved_args_size; | |
| 1528 | |
| 1529 public: | |
| 1530 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1531 void* popframe_preserved_args(); | |
| 1532 ByteSize popframe_preserved_args_size(); | |
| 1533 WordSize popframe_preserved_args_size_in_words(); | |
| 1534 void popframe_free_preserved_args(); | |
| 1535 | |
| 1536 | |
| 1537 private: | |
| 1538 JvmtiThreadState *_jvmti_thread_state; | |
| 1539 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1540 | |
| 1541 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1542 // entry, method exit and single stepping support. This field is | |
| 1543 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1544 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1545 // or a lock) so we have to be very careful. | |
| 1546 int _interp_only_mode; | |
| 1547 | |
| 1548 public: | |
| 1549 // used by the interpreter for fullspeed debugging support (see above) | |
| 1550 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1551 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1552 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1553 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1554 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1555 | |
|
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1556 // support for cached flag that indicates whether exceptions need to be posted for this thread |
|
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1557 // if this is false, we can avoid deoptimizing when events are thrown |
|
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|
1558 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
|
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1559 private: |
|
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|
1560 int _should_post_on_exceptions_flag; |
|
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|
1561 |
|
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|
1562 public: |
|
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|
1563 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
|
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|
1564 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
|
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|
1565 |
| 0 | 1566 private: |
| 1567 ThreadStatistics *_thread_stat; | |
| 1568 | |
| 1569 public: | |
| 1570 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1571 | |
| 1572 // Return a blocker object for which this thread is blocked parking. | |
| 1573 oop current_park_blocker(); | |
| 1574 | |
| 1575 private: | |
| 1576 static size_t _stack_size_at_create; | |
| 1577 | |
| 1578 public: | |
| 1579 static inline size_t stack_size_at_create(void) { | |
| 1580 return _stack_size_at_create; | |
| 1581 } | |
| 1582 static inline void set_stack_size_at_create(size_t value) { | |
| 1583 _stack_size_at_create = value; | |
| 1584 } | |
| 1585 | |
| 342 | 1586 #ifndef SERIALGC |
| 1587 // SATB marking queue support | |
| 1588 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1589 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1590 return _satb_mark_queue_set; | |
| 1591 } | |
| 1592 | |
| 1593 // Dirty card queue support | |
| 1594 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1595 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1596 return _dirty_card_queue_set; | |
| 1597 } | |
| 1598 #endif // !SERIALGC | |
| 1599 | |
|
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1600 // This method initializes the SATB and dirty card queues before a |
|
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|
1601 // JavaThread is added to the Java thread list. Right now, we don't |
|
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|
1602 // have to do anything to the dirty card queue (it should have been |
|
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|
1603 // activated when the thread was created), but we have to activate |
|
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|
1604 // the SATB queue if the thread is created while a marking cycle is |
|
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|
1605 // in progress. The activation / de-activation of the SATB queues at |
|
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|
1606 // the beginning / end of a marking cycle is done during safepoints |
|
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|
1607 // so we have to make sure this method is called outside one to be |
|
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|
1608 // able to safely read the active field of the SATB queue set. Right |
|
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|
1609 // now, it is called just before the thread is added to the Java |
|
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|
1610 // thread list in the Threads::add() method. That method is holding |
|
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|
1611 // the Threads_lock which ensures we are outside a safepoint. We |
|
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|
1612 // cannot do the obvious and set the active field of the SATB queue |
|
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1613 // when the thread is created given that, in some cases, safepoints |
|
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|
1614 // might happen between the JavaThread constructor being called and the |
|
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|
1615 // thread being added to the Java thread list (an example of this is |
|
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1616 // when the structure for the DestroyJavaVM thread is created). |
|
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|
1617 #ifndef SERIALGC |
|
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|
1618 void initialize_queues(); |
|
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|
1619 #else // !SERIALGC |
|
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|
1620 void initialize_queues() { } |
|
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1621 #endif // !SERIALGC |
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|
1622 |
| 0 | 1623 // Machine dependent stuff |
| 1972 | 1624 #ifdef TARGET_OS_ARCH_linux_x86 |
| 1625 # include "thread_linux_x86.hpp" | |
| 1626 #endif | |
| 1627 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 1628 # include "thread_linux_sparc.hpp" | |
| 1629 #endif | |
| 1630 #ifdef TARGET_OS_ARCH_linux_zero | |
| 1631 # include "thread_linux_zero.hpp" | |
| 1632 #endif | |
| 1633 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 1634 # include "thread_solaris_x86.hpp" | |
| 1635 #endif | |
| 1636 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 1637 # include "thread_solaris_sparc.hpp" | |
| 1638 #endif | |
| 1639 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 1640 # include "thread_windows_x86.hpp" | |
| 1641 #endif | |
|
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1642 #ifdef TARGET_OS_ARCH_linux_arm |
|
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|
1643 # include "thread_linux_arm.hpp" |
|
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|
1644 #endif |
|
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1645 #ifdef TARGET_OS_ARCH_linux_ppc |
|
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|
1646 # include "thread_linux_ppc.hpp" |
|
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|
1647 #endif |
| 3960 | 1648 #ifdef TARGET_OS_ARCH_bsd_x86 |
| 1649 # include "thread_bsd_x86.hpp" | |
| 1650 #endif | |
| 1651 #ifdef TARGET_OS_ARCH_bsd_zero | |
| 1652 # include "thread_bsd_zero.hpp" | |
| 1653 #endif | |
| 1972 | 1654 |
| 0 | 1655 |
| 1656 public: | |
| 1657 void set_blocked_on_compilation(bool value) { | |
| 1658 _blocked_on_compilation = value; | |
| 1659 } | |
| 1660 | |
| 1661 bool blocked_on_compilation() { | |
| 1662 return _blocked_on_compilation; | |
| 1663 } | |
| 1664 protected: | |
| 1665 bool _blocked_on_compilation; | |
| 1666 | |
| 1667 | |
| 1668 // JSR166 per-thread parker | |
| 1669 private: | |
| 1670 Parker* _parker; | |
| 1671 public: | |
| 1672 Parker* parker() { return _parker; } | |
| 1673 | |
| 1674 // Biased locking support | |
| 1675 private: | |
| 1676 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1677 public: | |
| 1678 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1679 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1680 | |
| 1681 // clearing/querying jni attach status | |
| 4006 | 1682 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } |
| 1683 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } | |
| 1684 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); } | |
| 342 | 1685 private: |
| 1686 // This field is used to determine if a thread has claimed | |
| 1687 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1688 // otherwise its value is the par_id that has been claimed. | |
| 1689 int _claimed_par_id; | |
| 1690 public: | |
| 1691 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1692 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1693 }; |
| 1694 | |
| 1695 // Inline implementation of JavaThread::current | |
| 1696 inline JavaThread* JavaThread::current() { | |
| 1697 Thread* thread = ThreadLocalStorage::thread(); | |
| 1698 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1699 return (JavaThread*)thread; | |
| 1700 } | |
| 1701 | |
| 1702 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1703 assert(is_Compiler_thread(), "just checking"); | |
| 1704 return (CompilerThread*)this; | |
| 1705 } | |
| 1706 | |
| 1707 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1708 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1709 } | |
| 1710 | |
| 1711 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1712 #ifdef ASSERT | |
| 1713 if (os::uses_stack_guard_pages()) { | |
| 1714 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1715 } | |
| 1716 #endif | |
| 1717 return _stack_guard_state == stack_guard_enabled; | |
| 1718 } | |
| 1719 | |
| 1720 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1721 // This code assumes java stacks grow down | |
| 1722 address low_addr; // Limit on the address for deepest stack depth | |
| 1723 if ( _stack_guard_state == stack_guard_unused) { | |
| 1724 low_addr = stack_base() - stack_size(); | |
| 1725 } else { | |
| 1726 low_addr = stack_yellow_zone_base(); | |
| 1727 } | |
| 1728 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1729 } | |
| 1730 | |
| 1731 // A thread used for Compilation. | |
| 1732 class CompilerThread : public JavaThread { | |
| 1733 friend class VMStructs; | |
| 1734 private: | |
| 1735 CompilerCounters* _counters; | |
| 1736 | |
| 1737 CompileLog* _log; | |
| 1738 CompileTask* _task; | |
| 1739 CompileQueue* _queue; | |
| 1740 | |
|
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1741 |
| 0 | 1742 public: |
| 1743 | |
| 1744 static CompilerThread* current(); | |
| 1745 | |
| 1746 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1747 | |
| 1748 bool is_Compiler_thread() const { return true; } | |
| 1749 // Hide this compiler thread from external view. | |
|
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1750 // (tw) For Graal, the compiler thread should be visible. |
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1751 bool is_hidden_from_external_view() const { |
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1752 #ifdef GRAAL |
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1753 return !DebugGraal; |
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1754 #else |
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1755 return true; |
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1756 #endif |
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1757 } |
| 0 | 1758 |
| 1759 CompileQueue* queue() { return _queue; } | |
| 1760 CompilerCounters* counters() { return _counters; } | |
| 1761 | |
| 1762 // Get/set the thread's logging information | |
| 1763 CompileLog* log() { return _log; } | |
| 1764 void init_log(CompileLog* log) { | |
| 1765 // Set once, for good. | |
| 1766 assert(_log == NULL, "set only once"); | |
| 1767 _log = log; | |
| 1768 } | |
| 1769 | |
| 1770 #ifndef PRODUCT | |
| 1771 private: | |
| 1772 IdealGraphPrinter *_ideal_graph_printer; | |
| 1773 public: | |
| 1774 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1775 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1776 #endif | |
| 1777 | |
| 1778 // Get/set the thread's current task | |
| 1779 CompileTask* task() { return _task; } | |
| 1780 void set_task(CompileTask* task) { _task = task; } | |
| 1781 }; | |
| 1782 | |
| 1783 inline CompilerThread* CompilerThread::current() { | |
| 1784 return JavaThread::current()->as_CompilerThread(); | |
| 1785 } | |
| 1786 | |
| 1787 | |
| 1788 // The active thread queue. It also keeps track of the current used | |
| 1789 // thread priorities. | |
| 1790 class Threads: AllStatic { | |
| 1791 friend class VMStructs; | |
| 1792 private: | |
| 1793 static JavaThread* _thread_list; | |
| 1794 static int _number_of_threads; | |
| 1795 static int _number_of_non_daemon_threads; | |
| 1796 static int _return_code; | |
| 1797 | |
| 1798 public: | |
| 1799 // Thread management | |
| 1800 // force_daemon is a concession to JNI, where we may need to add a | |
| 1801 // thread to the thread list before allocating its thread object | |
| 1802 static void add(JavaThread* p, bool force_daemon = false); | |
| 1803 static void remove(JavaThread* p); | |
| 1804 static bool includes(JavaThread* p); | |
| 1805 static JavaThread* first() { return _thread_list; } | |
| 1806 static void threads_do(ThreadClosure* tc); | |
| 1807 | |
| 1808 // Initializes the vm and creates the vm thread | |
| 1809 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1810 static void convert_vm_init_libraries_to_agents(); | |
| 1811 static void create_vm_init_libraries(); | |
| 1812 static void create_vm_init_agents(); | |
| 1813 static void shutdown_vm_agents(); | |
| 1814 static bool destroy_vm(); | |
| 1815 // Supported VM versions via JNI | |
| 1816 // Includes JNI_VERSION_1_1 | |
| 1817 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1818 // Does not include JNI_VERSION_1_1 | |
| 1819 static jboolean is_supported_jni_version(jint version); | |
| 1820 | |
| 1821 // Garbage collection | |
| 1822 static void follow_other_roots(void f(oop*)); | |
| 1823 | |
| 1824 // Apply "f->do_oop" to all root oops in all threads. | |
| 1825 // This version may only be called by sequential code. | |
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1826 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1827 // This version may be called by sequential or parallel code. |
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1828 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1829 // This creates a list of GCTasks, one per thread. |
| 1830 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1831 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1832 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1833 | |
| 1834 // Apply "f->do_oop" to roots in all threads that | |
| 1835 // are part of compiled frames | |
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1836 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1837 |
| 1838 static void convert_hcode_pointers(); | |
| 1839 static void restore_hcode_pointers(); | |
| 1840 | |
| 1841 // Sweeper | |
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1842 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1843 |
| 1844 static void gc_epilogue(); | |
| 1845 static void gc_prologue(); | |
| 1846 | |
| 1847 // Verification | |
| 1848 static void verify(); | |
| 1849 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1850 static void print(bool print_stacks, bool internal_format) { | |
| 1851 // this function is only used by debug.cpp | |
| 1852 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1853 } | |
| 1854 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1855 | |
| 1856 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1857 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1858 // VM needs to be at a safepoint. | |
| 1859 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1860 address monitor, bool doLock); | |
| 1861 | |
| 1862 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1863 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1864 // VM needs to be at a safepoint. | |
| 1865 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1866 bool doLock); | |
| 1867 | |
| 1868 // Number of threads on the active threads list | |
| 1869 static int number_of_threads() { return _number_of_threads; } | |
| 1870 // Number of non-daemon threads on the active threads list | |
| 1871 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1872 | |
| 1873 // Deoptimizes all frames tied to marked nmethods | |
| 1874 static void deoptimized_wrt_marked_nmethods(); | |
| 1875 | |
| 1876 }; | |
| 1877 | |
| 1878 | |
| 1879 // Thread iterator | |
| 1880 class ThreadClosure: public StackObj { | |
| 1881 public: | |
| 1882 virtual void do_thread(Thread* thread) = 0; | |
| 1883 }; | |
| 1884 | |
| 1885 class SignalHandlerMark: public StackObj { | |
| 1886 private: | |
| 1887 Thread* _thread; | |
| 1888 public: | |
| 1889 SignalHandlerMark(Thread* t) { | |
| 1890 _thread = t; | |
| 1891 if (_thread) _thread->enter_signal_handler(); | |
| 1892 } | |
| 1893 ~SignalHandlerMark() { | |
| 1894 if (_thread) _thread->leave_signal_handler(); | |
| 1895 _thread = NULL; | |
| 1896 } | |
| 1897 }; | |
| 1898 | |
| 1972 | 1899 |
| 1900 #endif // SHARE_VM_RUNTIME_THREAD_HPP |