Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 4970:33df1aeaebbf
Merge with http://hg.openjdk.java.net/hsx/hsx24/hotspot/
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Mon, 27 Feb 2012 13:10:13 +0100 |
| parents | 723df37192d6 0382d2b469b2 |
| children | 897b7d18bebc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #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" | |
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44 #include "trace/tracing.hpp" |
| 1972 | 45 #include "utilities/exceptions.hpp" |
| 46 #include "utilities/top.hpp" | |
| 47 #ifndef SERIALGC | |
| 48 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
| 49 #include "gc_implementation/g1/satbQueue.hpp" | |
| 50 #endif | |
| 51 #ifdef ZERO | |
| 52 #ifdef TARGET_ARCH_zero | |
| 53 # include "stack_zero.hpp" | |
| 54 #endif | |
| 55 #endif | |
| 56 | |
| 0 | 57 class ThreadSafepointState; |
| 58 class ThreadProfiler; | |
| 59 | |
| 60 class JvmtiThreadState; | |
| 61 class JvmtiGetLoadedClassesClosure; | |
| 62 class ThreadStatistics; | |
| 63 class ConcurrentLocksDump; | |
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64 class ParkEvent; |
| 1878 | 65 class Parker; |
| 0 | 66 |
| 67 class ciEnv; | |
| 68 class CompileThread; | |
| 69 class CompileLog; | |
| 70 class CompileTask; | |
| 71 class CompileQueue; | |
| 72 class CompilerCounters; | |
| 73 class vframeArray; | |
| 74 | |
| 75 class DeoptResourceMark; | |
| 76 class jvmtiDeferredLocalVariableSet; | |
| 77 | |
| 78 class GCTaskQueue; | |
| 79 class ThreadClosure; | |
| 80 class IdealGraphPrinter; | |
| 81 | |
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82 class WorkerThread; |
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83 |
| 0 | 84 // Class hierarchy |
| 85 // - Thread | |
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86 // - NamedThread |
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87 // - VMThread |
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88 // - ConcurrentGCThread |
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89 // - WorkerThread |
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90 // - GangWorker |
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91 // - GCTaskThread |
| 0 | 92 // - JavaThread |
| 93 // - WatcherThread | |
| 94 | |
| 95 class Thread: public ThreadShadow { | |
| 96 friend class VMStructs; | |
| 97 private: | |
| 98 // Exception handling | |
| 99 // (Note: _pending_exception and friends are in ThreadShadow) | |
| 100 //oop _pending_exception; // pending exception for current thread | |
| 101 // const char* _exception_file; // file information for exception (debugging only) | |
| 102 // int _exception_line; // line information for exception (debugging only) | |
| 103 | |
| 104 // Support for forcing alignment of thread objects for biased locking | |
| 105 void* _real_malloc_address; | |
| 106 public: | |
| 107 void* operator new(size_t size); | |
| 108 void operator delete(void* p); | |
| 109 private: | |
| 110 | |
| 111 // *************************************************************** | |
| 112 // Suspend and resume support | |
| 113 // *************************************************************** | |
| 114 // | |
| 115 // VM suspend/resume no longer exists - it was once used for various | |
| 116 // things including safepoints but was deprecated and finally removed | |
| 117 // in Java 7. Because VM suspension was considered "internal" Java-level | |
| 118 // suspension was considered "external", and this legacy naming scheme | |
| 119 // remains. | |
| 120 // | |
| 121 // External suspend/resume requests come from JVM_SuspendThread, | |
| 122 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
| 123 // ResumeThread. External | |
| 124 // suspend requests cause _external_suspend to be set and external | |
| 125 // resume requests cause _external_suspend to be cleared. | |
| 126 // External suspend requests do not nest on top of other external | |
| 127 // suspend requests. The higher level APIs reject suspend requests | |
| 128 // for already suspended threads. | |
| 129 // | |
| 130 // The external_suspend | |
| 131 // flag is checked by has_special_runtime_exit_condition() and java thread | |
| 132 // will self-suspend when handle_special_runtime_exit_condition() is | |
| 133 // called. Most uses of the _thread_blocked state in JavaThreads are | |
| 134 // considered the same as being externally suspended; if the blocking | |
| 135 // condition lifts, the JavaThread will self-suspend. Other places | |
| 136 // where VM checks for external_suspend include: | |
| 137 // + mutex granting (do not enter monitors when thread is suspended) | |
| 138 // + state transitions from _thread_in_native | |
| 139 // | |
| 140 // In general, java_suspend() does not wait for an external suspend | |
| 141 // request to complete. When it returns, the only guarantee is that | |
| 142 // the _external_suspend field is true. | |
| 143 // | |
| 144 // wait_for_ext_suspend_completion() is used to wait for an external | |
| 145 // suspend request to complete. External suspend requests are usually | |
| 146 // followed by some other interface call that requires the thread to | |
| 147 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
| 148 // the interface that requires quiescence, we give the JavaThread a | |
| 149 // chance to self-suspend before we need it to be quiescent. This | |
| 150 // improves overall suspend/query performance. | |
| 151 // | |
| 152 // _suspend_flags controls the behavior of java_ suspend/resume. | |
| 153 // It must be set under the protection of SR_lock. Read from the flag is | |
| 154 // OK without SR_lock as long as the value is only used as a hint. | |
| 155 // (e.g., check _external_suspend first without lock and then recheck | |
| 156 // inside SR_lock and finish the suspension) | |
| 157 // | |
| 158 // _suspend_flags is also overloaded for other "special conditions" so | |
| 159 // that a single check indicates whether any special action is needed | |
| 160 // eg. for async exceptions. | |
| 161 // ------------------------------------------------------------------- | |
| 162 // Notes: | |
| 163 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
| 164 // but we still update its value to keep other part of the system (mainly | |
| 165 // JVMTI) happy. ThreadState is legacy code (see notes in | |
| 166 // osThread.hpp). | |
| 167 // | |
| 168 // 2. It would be more natural if set_external_suspend() is private and | |
| 169 // part of java_suspend(), but that probably would affect the suspend/query | |
| 170 // performance. Need more investigation on this. | |
| 171 // | |
| 172 | |
| 173 // suspend/resume lock: used for self-suspend | |
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174 Monitor* _SR_lock; |
| 0 | 175 |
| 176 protected: | |
| 177 enum SuspendFlags { | |
| 178 // NOTE: avoid using the sign-bit as cc generates different test code | |
| 179 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
| 180 | |
| 181 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
| 182 _ext_suspended = 0x40000000U, // thread has self-suspended | |
| 183 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
| 184 | |
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185 _has_async_exception = 0x00000001U, // there is a pending async exception |
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186 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock |
| 0 | 187 }; |
| 188 | |
| 189 // various suspension related flags - atomically updated | |
| 190 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
| 191 volatile uint32_t _suspend_flags; | |
| 192 | |
| 193 private: | |
| 194 int _num_nested_signal; | |
| 195 | |
| 196 public: | |
| 197 void enter_signal_handler() { _num_nested_signal++; } | |
| 198 void leave_signal_handler() { _num_nested_signal--; } | |
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199 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
| 0 | 200 |
| 201 private: | |
| 202 // Debug tracing | |
| 203 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
| 204 | |
| 205 // Active_handles points to a block of handles | |
| 206 JNIHandleBlock* _active_handles; | |
| 207 | |
| 208 // One-element thread local free list | |
| 209 JNIHandleBlock* _free_handle_block; | |
| 210 | |
| 211 // Point to the last handle mark | |
| 212 HandleMark* _last_handle_mark; | |
| 213 | |
| 214 // The parity of the last strong_roots iteration in which this thread was | |
| 215 // claimed as a task. | |
| 216 jint _oops_do_parity; | |
| 217 | |
| 218 public: | |
| 219 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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220 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
| 0 | 221 private: |
| 222 | |
| 223 // debug support for checking if code does allow safepoints or not | |
| 224 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
| 225 // mutex, or blocking on an object synchronizer (Java locking). | |
| 226 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
| 227 // If !allow_allocation(), then an assertion failure will happen during allocation | |
| 228 // (Hence, !allow_safepoint() => !allow_allocation()). | |
| 229 // | |
| 230 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
| 231 // | |
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232 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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233 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
| 0 | 234 |
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235 // Used by SkipGCALot class. |
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236 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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237 |
| 0 | 238 // Record when GC is locked out via the GC_locker mechanism |
| 239 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
| 240 | |
| 241 friend class No_Alloc_Verifier; | |
| 242 friend class No_Safepoint_Verifier; | |
| 243 friend class Pause_No_Safepoint_Verifier; | |
| 244 friend class ThreadLocalStorage; | |
| 245 friend class GC_locker; | |
| 246 | |
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247 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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248 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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249 // the Java heap |
| 0 | 250 |
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251 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing |
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252 |
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253 int _vm_operation_started_count; // VM_Operation support |
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254 int _vm_operation_completed_count; // VM_Operation support |
| 0 | 255 |
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256 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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257 // is waiting to lock |
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258 bool _current_pending_monitor_is_from_java; // locking is from Java code |
| 0 | 259 |
| 260 // ObjectMonitor on which this thread called Object.wait() | |
| 261 ObjectMonitor* _current_waiting_monitor; | |
| 262 | |
| 263 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
| 264 public: | |
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265 ObjectMonitor* omFreeList; |
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266 int omFreeCount; // length of omFreeList |
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267 int omFreeProvision; // reload chunk size |
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268 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
| 1587 | 269 int omInUseCount; // length of omInUseList |
| 0 | 270 |
| 271 public: | |
| 272 enum { | |
| 273 is_definitely_current_thread = true | |
| 274 }; | |
| 275 | |
| 276 // Constructor | |
| 277 Thread(); | |
| 278 virtual ~Thread(); | |
| 279 | |
| 280 // initializtion | |
| 281 void initialize_thread_local_storage(); | |
| 282 | |
| 283 // thread entry point | |
| 284 virtual void run(); | |
| 285 | |
| 286 // Testers | |
| 287 virtual bool is_VM_thread() const { return false; } | |
| 288 virtual bool is_Java_thread() const { return false; } | |
| 289 virtual bool is_Compiler_thread() const { return false; } | |
| 290 virtual bool is_hidden_from_external_view() const { return false; } | |
| 291 virtual bool is_jvmti_agent_thread() const { return false; } | |
| 292 // True iff the thread can perform GC operations at a safepoint. | |
| 293 // Generally will be true only of VM thread and parallel GC WorkGang | |
| 294 // threads. | |
| 295 virtual bool is_GC_task_thread() const { return false; } | |
| 296 virtual bool is_Watcher_thread() const { return false; } | |
| 297 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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298 virtual bool is_Named_thread() const { return false; } |
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299 virtual bool is_Worker_thread() const { return false; } |
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300 |
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301 // Casts |
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302 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
| 0 | 303 |
| 304 virtual char* name() const { return (char*)"Unknown thread"; } | |
| 305 | |
| 306 // Returns the current thread | |
| 307 static inline Thread* current(); | |
| 308 | |
| 309 // Common thread operations | |
| 310 static void set_priority(Thread* thread, ThreadPriority priority); | |
| 311 static ThreadPriority get_priority(const Thread* const thread); | |
| 312 static void start(Thread* thread); | |
| 313 static void interrupt(Thread* thr); | |
| 314 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
| 315 | |
| 4006 | 316 void set_native_thread_name(const char *name) { |
| 317 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); | |
| 318 os::set_native_thread_name(name); | |
| 319 } | |
| 320 | |
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321 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
| 0 | 322 Monitor* SR_lock() const { return _SR_lock; } |
| 323 | |
| 324 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
| 325 | |
| 326 void set_suspend_flag(SuspendFlags f) { | |
| 327 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 328 uint32_t flags; | |
| 329 do { | |
| 330 flags = _suspend_flags; | |
| 331 } | |
| 332 while (Atomic::cmpxchg((jint)(flags | f), | |
| 333 (volatile jint*)&_suspend_flags, | |
| 334 (jint)flags) != (jint)flags); | |
| 335 } | |
| 336 void clear_suspend_flag(SuspendFlags f) { | |
| 337 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
| 338 uint32_t flags; | |
| 339 do { | |
| 340 flags = _suspend_flags; | |
| 341 } | |
| 342 while (Atomic::cmpxchg((jint)(flags & ~f), | |
| 343 (volatile jint*)&_suspend_flags, | |
| 344 (jint)flags) != (jint)flags); | |
| 345 } | |
| 346 | |
| 347 void set_has_async_exception() { | |
| 348 set_suspend_flag(_has_async_exception); | |
| 349 } | |
| 350 void clear_has_async_exception() { | |
| 351 clear_suspend_flag(_has_async_exception); | |
| 352 } | |
| 353 | |
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354 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } |
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355 |
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356 void set_critical_native_unlock() { |
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357 set_suspend_flag(_critical_native_unlock); |
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358 } |
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359 void clear_critical_native_unlock() { |
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360 clear_suspend_flag(_critical_native_unlock); |
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361 } |
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362 |
| 0 | 363 // Support for Unhandled Oop detection |
| 364 #ifdef CHECK_UNHANDLED_OOPS | |
| 365 private: | |
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366 UnhandledOops* _unhandled_oops; |
| 0 | 367 public: |
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368 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
| 0 | 369 // Mark oop safe for gc. It may be stack allocated but won't move. |
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370 void allow_unhandled_oop(oop *op) { |
| 0 | 371 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
| 372 } | |
| 373 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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374 void clear_unhandled_oops() { |
| 0 | 375 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
| 376 } | |
| 377 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
| 378 #endif // CHECK_UNHANDLED_OOPS | |
| 379 | |
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380 #ifndef PRODUCT |
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381 bool skip_gcalot() { return _skip_gcalot; } |
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382 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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383 #endif |
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384 |
| 0 | 385 public: |
| 386 // Installs a pending exception to be inserted later | |
| 387 static void send_async_exception(oop thread_oop, oop java_throwable); | |
| 388 | |
| 389 // Resource area | |
| 390 ResourceArea* resource_area() const { return _resource_area; } | |
| 391 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
| 392 | |
| 393 OSThread* osthread() const { return _osthread; } | |
| 394 void set_osthread(OSThread* thread) { _osthread = thread; } | |
| 395 | |
| 396 // JNI handle support | |
| 397 JNIHandleBlock* active_handles() const { return _active_handles; } | |
| 398 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
| 399 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
| 400 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
| 401 | |
| 402 // Internal handle support | |
| 403 HandleArea* handle_area() const { return _handle_area; } | |
| 404 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
| 405 | |
| 406 // Thread-Local Allocation Buffer (TLAB) support | |
| 407 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
| 408 void initialize_tlab() { | |
| 409 if (UseTLAB) { | |
| 410 tlab().initialize(); | |
| 411 } | |
| 412 } | |
| 413 | |
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414 jlong allocated_bytes() { return _allocated_bytes; } |
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415 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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416 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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417 jlong cooked_allocated_bytes() { |
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418 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); |
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419 if (UseTLAB) { |
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420 size_t used_bytes = tlab().used_bytes(); |
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421 if ((ssize_t)used_bytes > 0) { |
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422 // More-or-less valid tlab. The load_acquire above should ensure |
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423 // that the result of the add is <= the instantaneous value |
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424 return allocated_bytes + used_bytes; |
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425 } |
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426 } |
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427 return allocated_bytes; |
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428 } |
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429 |
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430 TRACE_BUFFER trace_buffer() { return _trace_buffer; } |
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431 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; } |
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432 |
| 0 | 433 // VM operation support |
| 434 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
| 435 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
| 436 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
| 437 | |
| 438 // For tracking the heavyweight monitor the thread is pending on. | |
| 439 ObjectMonitor* current_pending_monitor() { | |
| 440 return _current_pending_monitor; | |
| 441 } | |
| 442 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
| 443 _current_pending_monitor = monitor; | |
| 444 } | |
| 445 void set_current_pending_monitor_is_from_java(bool from_java) { | |
| 446 _current_pending_monitor_is_from_java = from_java; | |
| 447 } | |
| 448 bool current_pending_monitor_is_from_java() { | |
| 449 return _current_pending_monitor_is_from_java; | |
| 450 } | |
| 451 | |
| 452 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
| 453 ObjectMonitor* current_waiting_monitor() { | |
| 454 return _current_waiting_monitor; | |
| 455 } | |
| 456 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
| 457 _current_waiting_monitor = monitor; | |
| 458 } | |
| 459 | |
| 460 // GC support | |
| 461 // Apply "f->do_oop" to all root oops in "this". | |
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462 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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463 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 464 |
| 465 // Handles the parallel case for the method below. | |
| 466 private: | |
| 467 bool claim_oops_do_par_case(int collection_parity); | |
| 468 public: | |
| 469 // Requires that "collection_parity" is that of the current strong roots | |
| 470 // iteration. If "is_par" is false, sets the parity of "this" to | |
| 471 // "collection_parity", and returns "true". If "is_par" is true, | |
| 472 // uses an atomic instruction to set the current threads parity to | |
| 473 // "collection_parity", if it is not already. Returns "true" iff the | |
| 474 // calling thread does the update, this indicates that the calling thread | |
| 475 // has claimed the thread's stack as a root groop in the current | |
| 476 // collection. | |
| 477 bool claim_oops_do(bool is_par, int collection_parity) { | |
| 478 if (!is_par) { | |
| 479 _oops_do_parity = collection_parity; | |
| 480 return true; | |
| 481 } else { | |
| 482 return claim_oops_do_par_case(collection_parity); | |
| 483 } | |
| 484 } | |
| 485 | |
| 486 // Sweeper support | |
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487 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 488 |
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489 // Used by fast lock support |
| 0 | 490 virtual bool is_lock_owned(address adr) const; |
| 491 | |
| 492 // Check if address is in the stack of the thread (not just for locks). | |
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493 // Warning: the method can only be used on the running thread |
| 0 | 494 bool is_in_stack(address adr) const; |
| 495 | |
| 496 // Sets this thread as starting thread. Returns failure if thread | |
| 497 // creation fails due to lack of memory, too many threads etc. | |
| 498 bool set_as_starting_thread(); | |
| 499 | |
| 500 protected: | |
| 501 // OS data associated with the thread | |
| 502 OSThread* _osthread; // Platform-specific thread information | |
| 503 | |
| 504 // Thread local resource area for temporary allocation within the VM | |
| 505 ResourceArea* _resource_area; | |
| 506 | |
| 507 // Thread local handle area for allocation of handles within the VM | |
| 508 HandleArea* _handle_area; | |
| 509 | |
| 510 // Support for stack overflow handling, get_thread, etc. | |
| 511 address _stack_base; | |
| 512 size_t _stack_size; | |
| 513 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
| 514 int _lgrp_id; | |
| 515 | |
| 516 public: | |
| 517 // Stack overflow support | |
| 518 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
| 519 | |
| 520 void set_stack_base(address base) { _stack_base = base; } | |
| 521 size_t stack_size() const { return _stack_size; } | |
| 522 void set_stack_size(size_t size) { _stack_size = size; } | |
| 523 void record_stack_base_and_size(); | |
| 524 | |
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525 bool on_local_stack(address adr) const { |
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526 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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527 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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528 } |
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529 |
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530 uintptr_t self_raw_id() { return _self_raw_id; } |
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531 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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532 |
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533 int lgrp_id() const { return _lgrp_id; } |
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534 void set_lgrp_id(int value) { _lgrp_id = value; } |
| 0 | 535 |
| 536 // Printing | |
| 537 void print_on(outputStream* st) const; | |
| 538 void print() const { print_on(tty); } | |
| 539 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 540 | |
| 541 // Debug-only code | |
| 542 | |
| 543 #ifdef ASSERT | |
| 544 private: | |
| 545 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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546 Monitor* _owned_locks; |
| 0 | 547 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
| 548 // thus the friendship | |
| 549 friend class Mutex; | |
| 550 friend class Monitor; | |
| 551 | |
| 552 public: | |
| 553 void print_owned_locks_on(outputStream* st) const; | |
| 554 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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555 Monitor* owned_locks() const { return _owned_locks; } |
| 0 | 556 bool owns_locks() const { return owned_locks() != NULL; } |
| 557 bool owns_locks_but_compiled_lock() const; | |
| 558 | |
| 559 // Deadlock detection | |
| 560 bool allow_allocation() { return _allow_allocation_count == 0; } | |
| 561 #endif | |
| 562 | |
| 563 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
| 564 | |
| 565 private: | |
| 566 volatile int _jvmti_env_iteration_count; | |
| 567 | |
| 568 public: | |
| 569 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
| 570 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
| 571 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
| 572 | |
| 573 // Code generation | |
| 574 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
| 575 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
| 576 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
| 577 | |
| 578 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
| 579 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
| 580 | |
| 581 #define TLAB_FIELD_OFFSET(name) \ | |
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582 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
| 0 | 583 |
| 584 TLAB_FIELD_OFFSET(start) | |
| 585 TLAB_FIELD_OFFSET(end) | |
| 586 TLAB_FIELD_OFFSET(top) | |
| 587 TLAB_FIELD_OFFSET(pf_top) | |
| 588 TLAB_FIELD_OFFSET(size) // desired_size | |
| 589 TLAB_FIELD_OFFSET(refill_waste_limit) | |
| 590 TLAB_FIELD_OFFSET(number_of_refills) | |
| 591 TLAB_FIELD_OFFSET(fast_refill_waste) | |
| 592 TLAB_FIELD_OFFSET(slow_allocations) | |
| 593 | |
| 594 #undef TLAB_FIELD_OFFSET | |
| 595 | |
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596 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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597 |
| 0 | 598 public: |
| 599 volatile intptr_t _Stalled ; | |
| 600 volatile int _TypeTag ; | |
| 601 ParkEvent * _ParkEvent ; // for synchronized() | |
| 602 ParkEvent * _SleepEvent ; // for Thread.sleep | |
| 603 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
| 604 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
| 605 int NativeSyncRecursion ; // diagnostic | |
| 606 | |
| 607 volatile int _OnTrap ; // Resume-at IP delta | |
| 608 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
| 609 jint _hashStateX ; // thread-specific hashCode generator state | |
| 610 jint _hashStateY ; | |
| 611 jint _hashStateZ ; | |
| 612 void * _schedctl ; | |
| 613 | |
| 614 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
| 615 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
| 616 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
| 617 | |
| 618 volatile jint rng [4] ; // RNG for spin loop | |
| 619 | |
| 620 // Low-level leaf-lock primitives used to implement synchronization | |
| 621 // and native monitor-mutex infrastructure. | |
| 622 // Not for general synchronization use. | |
| 623 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
| 624 static void SpinRelease (volatile int * Lock) ; | |
| 625 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
| 626 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
| 627 static void muxRelease (volatile intptr_t * Lock) ; | |
| 628 }; | |
| 629 | |
| 630 // Inline implementation of Thread::current() | |
| 631 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
| 632 // startup. | |
| 633 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
| 634 // period. This is inlined in thread_<os_family>.inline.hpp. | |
| 635 | |
| 636 inline Thread* Thread::current() { | |
| 637 #ifdef ASSERT | |
| 638 // This function is very high traffic. Define PARANOID to enable expensive | |
| 639 // asserts. | |
| 640 #ifdef PARANOID | |
| 641 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
| 642 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 643 assert(t != NULL && !t->is_inside_signal_handler(), | |
| 644 "Don't use Thread::current() inside signal handler"); | |
| 645 #endif | |
| 646 #endif | |
| 647 Thread* thread = ThreadLocalStorage::thread(); | |
| 648 assert(thread != NULL, "just checking"); | |
| 649 return thread; | |
| 650 } | |
| 651 | |
| 652 // Name support for threads. non-JavaThread subclasses with multiple | |
| 653 // uniquely named instances should derive from this. | |
| 654 class NamedThread: public Thread { | |
| 655 friend class VMStructs; | |
| 656 enum { | |
| 657 max_name_len = 64 | |
| 658 }; | |
| 659 private: | |
| 660 char* _name; | |
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661 // log JavaThread being processed by oops_do |
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662 JavaThread* _processed_thread; |
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663 |
| 0 | 664 public: |
| 665 NamedThread(); | |
| 666 ~NamedThread(); | |
| 667 // May only be called once per thread. | |
| 668 void set_name(const char* format, ...); | |
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669 virtual bool is_Named_thread() const { return true; } |
| 0 | 670 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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671 JavaThread *processed_thread() { return _processed_thread; } |
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672 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
| 0 | 673 }; |
| 674 | |
| 675 // Worker threads are named and have an id of an assigned work. | |
| 676 class WorkerThread: public NamedThread { | |
| 677 private: | |
| 678 uint _id; | |
| 679 public: | |
|
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680 WorkerThread() : _id(0) { } |
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681 virtual bool is_Worker_thread() const { return true; } |
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682 |
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683 virtual WorkerThread* as_Worker_thread() const { |
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684 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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685 return (WorkerThread*) this; |
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686 } |
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687 |
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688 void set_id(uint work_id) { _id = work_id; } |
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|
689 uint id() const { return _id; } |
| 0 | 690 }; |
| 691 | |
| 692 // A single WatcherThread is used for simulating timer interrupts. | |
| 693 class WatcherThread: public Thread { | |
| 694 friend class VMStructs; | |
| 695 public: | |
| 696 virtual void run(); | |
| 697 | |
| 698 private: | |
| 699 static WatcherThread* _watcher_thread; | |
| 700 | |
|
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701 volatile static bool _should_terminate; // updated without holding lock |
| 0 | 702 public: |
| 703 enum SomeConstants { | |
| 704 delay_interval = 10 // interrupt delay in milliseconds | |
| 705 }; | |
| 706 | |
| 707 // Constructor | |
| 708 WatcherThread(); | |
| 709 | |
| 710 // Tester | |
| 711 bool is_Watcher_thread() const { return true; } | |
| 712 | |
| 713 // Printing | |
| 714 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
| 715 void print_on(outputStream* st) const; | |
| 716 void print() const { print_on(tty); } | |
| 717 | |
| 718 // Returns the single instance of WatcherThread | |
| 719 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
| 720 | |
| 721 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
| 722 static void start(); | |
| 723 static void stop(); | |
| 724 }; | |
| 725 | |
| 726 | |
| 727 class CompilerThread; | |
| 728 | |
| 729 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
| 730 | |
| 731 class JavaThread: public Thread { | |
| 732 friend class VMStructs; | |
| 733 private: | |
| 734 JavaThread* _next; // The next thread in the Threads list | |
| 735 oop _threadObj; // The Java level thread object | |
| 736 | |
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737 // (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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738 BufferBlob* _buffer_blob; |
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739 ciEnv* _env; |
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740 bool _is_compiling; |
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741 |
| 0 | 742 #ifdef ASSERT |
| 743 private: | |
| 744 int _java_call_counter; | |
| 745 | |
| 746 public: | |
| 747 int java_call_counter() { return _java_call_counter; } | |
| 748 void inc_java_call_counter() { _java_call_counter++; } | |
| 749 void dec_java_call_counter() { | |
| 750 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
| 751 _java_call_counter--; | |
| 752 } | |
| 753 private: // restore original namespace restriction | |
| 754 #endif // ifdef ASSERT | |
| 755 | |
| 756 #ifndef PRODUCT | |
| 757 public: | |
| 758 enum { | |
| 759 jump_ring_buffer_size = 16 | |
| 760 }; | |
| 761 private: // restore original namespace restriction | |
| 762 #endif | |
| 763 | |
| 764 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
| 765 | |
| 766 ThreadFunction _entry_point; | |
| 767 | |
| 768 JNIEnv _jni_environment; | |
| 769 | |
| 770 // Deopt support | |
| 771 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
| 772 | |
| 773 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
| 774 // transition out of native | |
|
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775 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
| 0 | 776 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| 777 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
| 778 // Because deoptimization is lazy we must save jvmti requests to set locals | |
| 779 // in compiled frames until we deoptimize and we have an interpreter frame. | |
| 780 // This holds the pointer to array (yeah like there might be more than one) of | |
| 781 // description of compiled vframes that have locals that need to be updated. | |
| 782 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
| 783 | |
| 784 // Handshake value for fixing 6243940. We need a place for the i2c | |
| 785 // adapter to store the callee methodOop. This value is NEVER live | |
| 786 // across a gc point so it does NOT have to be gc'd | |
| 787 // The handshake is open ended since we can't be certain that it will | |
| 788 // be NULLed. This is because we rarely ever see the race and end up | |
| 789 // in handle_wrong_method which is the backend of the handshake. See | |
| 790 // code in i2c adapters and handle_wrong_method. | |
| 791 | |
| 792 methodOop _callee_target; | |
| 793 | |
| 794 // Oop results of VM runtime calls | |
|
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795 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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796 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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797 |
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|
798 // See ReduceInitialCardMarks: this holds the precise space interval of |
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799 // the most recent slow path allocation for which compiled code has |
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800 // elided card-marks for performance along the fast-path. |
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|
801 MemRegion _deferred_card_mark; |
| 0 | 802 |
| 803 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
| 804 // allocated during deoptimization | |
| 805 // and by JNI_MonitorEnter/Exit | |
| 806 | |
| 807 // Async. requests support | |
| 808 enum AsyncRequests { | |
| 809 _no_async_condition = 0, | |
| 810 _async_exception, | |
| 811 _async_unsafe_access_error | |
| 812 }; | |
| 813 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
| 814 oop _pending_async_exception; | |
| 815 | |
| 816 // Safepoint support | |
| 817 public: // Expose _thread_state for SafeFetchInt() | |
| 818 volatile JavaThreadState _thread_state; | |
| 819 private: | |
| 820 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
| 821 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
| 822 | |
| 823 // JavaThread termination support | |
| 824 enum TerminatedTypes { | |
| 825 _not_terminated = 0xDEAD - 2, | |
| 826 _thread_exiting, // JavaThread::exit() has been called for this thread | |
| 827 _thread_terminated, // JavaThread is removed from thread list | |
| 828 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
| 829 // only VM_Exit can set _vm_exited | |
| 830 }; | |
| 831 | |
| 832 // In general a JavaThread's _terminated field transitions as follows: | |
| 833 // | |
| 834 // _not_terminated => _thread_exiting => _thread_terminated | |
| 835 // | |
| 836 // _vm_exited is a special value to cover the case of a JavaThread | |
| 837 // executing native code after the VM itself is terminated. | |
|
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838 volatile TerminatedTypes _terminated; |
| 0 | 839 // suspend/resume support |
| 840 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
| 841 jint _in_deopt_handler; // count of deoptimization | |
| 842 // handlers thread is in | |
| 843 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
| 844 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
| 845 // never locked) when throwing an exception. Used by interpreter only. | |
| 846 | |
| 4006 | 847 // JNI attach states: |
| 848 enum JNIAttachStates { | |
| 849 _not_attaching_via_jni = 1, // thread is not attaching via JNI | |
| 850 _attaching_via_jni, // thread is attaching via JNI | |
| 851 _attached_via_jni // thread has attached via JNI | |
| 852 }; | |
| 853 | |
| 854 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. | |
| 855 // A native thread that is attaching via JNI starts with a value | |
| 856 // of _attaching_via_jni and transitions to _attached_via_jni. | |
| 857 volatile JNIAttachStates _jni_attach_state; | |
| 0 | 858 |
| 859 public: | |
| 860 // State of the stack guard pages for this thread. | |
| 861 enum StackGuardState { | |
| 862 stack_guard_unused, // not needed | |
| 863 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
| 864 stack_guard_enabled // enabled | |
| 865 }; | |
| 866 | |
| 867 private: | |
| 868 | |
|
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869 // graal needs some place to put the dimensions |
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870 jint graal_multinewarray_storage[256]; |
|
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871 |
|
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872 volatile oop _graal_deopt_info; |
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873 |
| 0 | 874 StackGuardState _stack_guard_state; |
| 875 | |
|
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876 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper |
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|
877 |
| 0 | 878 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is |
| 879 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
| 880 // code) | |
| 881 volatile oop _exception_oop; // Exception thrown in compiled code | |
| 882 volatile address _exception_pc; // PC where exception happened | |
| 883 volatile address _exception_handler_pc; // PC for handler of exception | |
|
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884 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 0 | 885 |
| 886 // support for JNI critical regions | |
| 887 jint _jni_active_critical; // count of entries into JNI critical region | |
| 888 | |
| 889 // For deadlock detection. | |
| 890 int _depth_first_number; | |
| 891 | |
| 892 // JVMTI PopFrame support | |
| 893 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
| 894 int _popframe_condition; | |
| 895 | |
| 896 #ifndef PRODUCT | |
| 897 int _jmp_ring_index; | |
| 898 struct { | |
| 899 // We use intptr_t instead of address so debugger doesn't try and display strings | |
| 900 intptr_t _target; | |
| 901 intptr_t _instruction; | |
| 902 const char* _file; | |
| 903 int _line; | |
| 904 } _jmp_ring[ jump_ring_buffer_size ]; | |
| 905 #endif /* PRODUCT */ | |
| 906 | |
| 342 | 907 #ifndef SERIALGC |
| 908 // Support for G1 barriers | |
| 909 | |
| 910 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
| 911 // Set of all such queues. | |
| 912 static SATBMarkQueueSet _satb_mark_queue_set; | |
| 913 | |
| 914 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
| 915 // Set of all such queues. | |
| 916 static DirtyCardQueueSet _dirty_card_queue_set; | |
|
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917 |
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918 void flush_barrier_queues(); |
| 342 | 919 #endif // !SERIALGC |
| 920 | |
| 0 | 921 friend class VMThread; |
| 922 friend class ThreadWaitTransition; | |
| 923 friend class VM_Exit; | |
| 924 | |
| 925 void initialize(); // Initialized the instance variables | |
| 926 | |
| 927 public: | |
| 928 // Constructor | |
| 4006 | 929 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads |
| 0 | 930 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
| 931 ~JavaThread(); | |
| 932 | |
| 933 #ifdef ASSERT | |
| 934 // verify this JavaThread hasn't be published in the Threads::list yet | |
| 935 void verify_not_published(); | |
| 936 #endif | |
| 937 | |
| 938 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
| 939 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
| 940 _jni_environment.functions = functionTable; | |
| 941 } | |
| 942 struct JNINativeInterface_* get_jni_functions() { | |
| 943 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
| 944 } | |
|
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945 |
|
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946 bool is_compiling() const { return _is_compiling; } |
|
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947 void set_compiling(bool b) { _is_compiling = b; } |
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948 |
|
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|
949 // Get/set the thread's compilation environment. |
|
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950 ciEnv* env() { return _env; } |
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951 void set_env(ciEnv* env) { _env = env; } |
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952 |
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953 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
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|
954 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; |
| 0 | 955 |
|
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956 // This function is called at thread creation to allow |
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957 // platform specific thread variables to be initialized. |
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958 void cache_global_variables(); |
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959 |
| 0 | 960 // Executes Shutdown.shutdown() |
| 961 void invoke_shutdown_hooks(); | |
| 962 | |
| 963 // Cleanup on thread exit | |
| 964 enum ExitType { | |
| 965 normal_exit, | |
| 966 jni_detach | |
| 967 }; | |
| 968 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
| 969 | |
| 970 void cleanup_failed_attach_current_thread(); | |
| 971 | |
|
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972 // Track the nmethod currently being scanned by the sweeper |
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973 void set_scanned_nmethod(nmethod* nm) { |
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974 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); |
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975 _scanned_nmethod = nm; |
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976 } |
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977 |
| 0 | 978 // Testers |
| 979 virtual bool is_Java_thread() const { return true; } | |
| 980 | |
| 981 // Thread chain operations | |
| 982 JavaThread* next() const { return _next; } | |
| 983 void set_next(JavaThread* p) { _next = p; } | |
| 984 | |
| 985 // Thread oop. threadObj() can be NULL for initial JavaThread | |
| 986 // (or for threads attached via JNI) | |
| 987 oop threadObj() const { return _threadObj; } | |
| 988 void set_threadObj(oop p) { _threadObj = p; } | |
| 989 | |
| 990 ThreadPriority java_priority() const; // Read from threadObj() | |
| 991 | |
| 992 // Prepare thread and add to priority queue. If a priority is | |
| 993 // not specified, use the priority of the thread object. Threads_lock | |
| 994 // must be held while this function is called. | |
| 995 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
| 996 | |
| 997 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
| 998 address saved_exception_pc() { return _saved_exception_pc; } | |
| 999 | |
| 1000 | |
| 1001 ThreadFunction entry_point() const { return _entry_point; } | |
| 1002 | |
| 1003 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
| 1004 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
| 1005 | |
| 1006 // Last frame anchor routines | |
| 1007 | |
| 1008 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
| 1009 | |
| 1010 // last_Java_sp | |
| 1011 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
| 1012 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
| 1013 | |
| 1014 // last_Java_pc | |
| 1015 | |
| 1016 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
| 1017 | |
| 1018 // Safepoint support | |
| 1019 JavaThreadState thread_state() const { return _thread_state; } | |
| 1020 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
| 1021 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
| 1022 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
| 1023 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
| 1024 | |
| 1025 // thread has called JavaThread::exit() or is terminated | |
| 1026 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
| 1027 // thread is terminated (no longer on the threads list); we compare | |
| 1028 // against the two non-terminated values so that a freed JavaThread | |
| 1029 // will also be considered terminated. | |
| 1030 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
| 1031 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
| 1032 // special for Threads::remove() which is static: | |
| 1033 void set_terminated_value() { _terminated = _thread_terminated; } | |
| 1034 void block_if_vm_exited(); | |
| 1035 | |
| 1036 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
| 1037 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
| 1038 | |
| 1039 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
| 1040 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
| 1041 | |
| 1042 | |
| 1043 // Suspend/resume support for JavaThread | |
| 1044 | |
| 1045 private: | |
| 1046 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
| 1047 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
| 1048 | |
| 1049 public: | |
| 1050 void java_suspend(); | |
| 1051 void java_resume(); | |
| 1052 int java_suspend_self(); | |
| 1053 | |
| 1054 void check_and_wait_while_suspended() { | |
| 1055 assert(JavaThread::current() == this, "sanity check"); | |
| 1056 | |
| 1057 bool do_self_suspend; | |
| 1058 do { | |
| 1059 // were we externally suspended while we were waiting? | |
| 1060 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
| 1061 if (do_self_suspend) { | |
| 1062 // don't surprise the thread that suspended us by returning | |
| 1063 java_suspend_self(); | |
| 1064 set_suspend_equivalent(); | |
| 1065 } | |
| 1066 } while (do_self_suspend); | |
| 1067 } | |
| 1068 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
| 1069 // Check for async exception in addition to safepoint and suspend request. | |
| 1070 static void check_special_condition_for_native_trans(JavaThread *thread); | |
| 1071 | |
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1072 // Same as check_special_condition_for_native_trans but finishes the |
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1073 // transition into thread_in_Java mode so that it can potentially |
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1074 // block. |
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1075 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); |
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1076 |
| 0 | 1077 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); |
| 1078 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
| 1079 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1080 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1081 // SR_lock to allow the thread to reach a stable thread state if | |
| 1082 // it is currently in a transient thread state. | |
| 1083 return is_ext_suspend_completed(false /*!called_by_wait */, | |
| 1084 SuspendRetryDelay, bits); | |
| 1085 } | |
| 1086 | |
| 1087 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
| 1088 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
| 1089 // passed as the count and delay parameters. Experiments with specific | |
| 1090 // calls to wait_for_ext_suspend_completion() can be done by passing | |
| 1091 // other values in the code. Experiments with all calls can be done | |
| 1092 // via the appropriate -XX options. | |
| 1093 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
| 1094 | |
| 1095 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
| 1096 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
| 1097 | |
| 1098 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
| 1099 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
| 1100 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
| 1101 | |
| 1102 bool is_external_suspend() const { | |
| 1103 return (_suspend_flags & _external_suspend) != 0; | |
| 1104 } | |
| 1105 // Whenever a thread transitions from native to vm/java it must suspend | |
| 1106 // if external|deopt suspend is present. | |
| 1107 bool is_suspend_after_native() const { | |
| 1108 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
| 1109 } | |
| 1110 | |
| 1111 // external suspend request is completed | |
| 1112 bool is_ext_suspended() const { | |
| 1113 return (_suspend_flags & _ext_suspended) != 0; | |
| 1114 } | |
| 1115 | |
| 1116 bool is_external_suspend_with_lock() const { | |
| 1117 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1118 return is_external_suspend(); | |
| 1119 } | |
| 1120 | |
| 1121 // Special method to handle a pending external suspend request | |
| 1122 // when a suspend equivalent condition lifts. | |
| 1123 bool handle_special_suspend_equivalent_condition() { | |
| 1124 assert(is_suspend_equivalent(), | |
| 1125 "should only be called in a suspend equivalence condition"); | |
| 1126 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1127 bool ret = is_external_suspend(); | |
| 1128 if (!ret) { | |
| 1129 // not about to self-suspend so clear suspend equivalence | |
| 1130 clear_suspend_equivalent(); | |
| 1131 } | |
| 1132 // implied else: | |
| 1133 // We have a pending external suspend request so we leave the | |
| 1134 // suspend_equivalent flag set until java_suspend_self() sets | |
| 1135 // the ext_suspended flag and clears the suspend_equivalent | |
| 1136 // flag. This insures that wait_for_ext_suspend_completion() | |
| 1137 // will return consistent values. | |
| 1138 return ret; | |
| 1139 } | |
| 1140 | |
| 1141 // utility methods to see if we are doing some kind of suspension | |
| 1142 bool is_being_ext_suspended() const { | |
| 1143 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1144 return is_ext_suspended() || is_external_suspend(); | |
| 1145 } | |
| 1146 | |
| 1147 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
| 1148 | |
| 1149 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
| 1150 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
| 1151 | |
| 1152 // Thread.stop support | |
| 1153 void send_thread_stop(oop throwable); | |
| 1154 AsyncRequests clear_special_runtime_exit_condition() { | |
| 1155 AsyncRequests x = _special_runtime_exit_condition; | |
| 1156 _special_runtime_exit_condition = _no_async_condition; | |
| 1157 return x; | |
| 1158 } | |
| 1159 | |
| 1160 // Are any async conditions present? | |
| 1161 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
| 1162 | |
| 1163 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
| 1164 | |
| 1165 // these next two are also used for self-suspension and async exception support | |
| 1166 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
| 1167 | |
| 1168 // Return true if JavaThread has an asynchronous condition or | |
| 1169 // if external suspension is requested. | |
| 1170 bool has_special_runtime_exit_condition() { | |
| 1171 // We call is_external_suspend() last since external suspend should | |
| 1172 // be less common. Because we don't use is_external_suspend_with_lock | |
| 1173 // it is possible that we won't see an asynchronous external suspend | |
| 1174 // request that has just gotten started, i.e., SR_lock grabbed but | |
| 1175 // _external_suspend field change either not made yet or not visible | |
| 1176 // yet. However, this is okay because the request is asynchronous and | |
| 1177 // we will see the new flag value the next time through. It's also | |
| 1178 // possible that the external suspend request is dropped after | |
| 1179 // we have checked is_external_suspend(), we will recheck its value | |
| 1180 // under SR_lock in java_suspend_self(). | |
| 1181 return (_special_runtime_exit_condition != _no_async_condition) || | |
| 1182 is_external_suspend() || is_deopt_suspend(); | |
| 1183 } | |
| 1184 | |
| 1185 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
| 1186 | |
| 1187 void set_pending_async_exception(oop e) { | |
| 1188 _pending_async_exception = e; | |
| 1189 _special_runtime_exit_condition = _async_exception; | |
| 1190 set_has_async_exception(); | |
| 1191 } | |
| 1192 | |
| 1193 // Fast-locking support | |
| 1194 bool is_lock_owned(address adr) const; | |
| 1195 | |
| 1196 // Accessors for vframe array top | |
| 1197 // The linked list of vframe arrays are sorted on sp. This means when we | |
| 1198 // unpack the head must contain the vframe array to unpack. | |
| 1199 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
| 1200 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
| 1201 | |
| 1202 // Side structure for defering update of java frame locals until deopt occurs | |
| 1203 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
| 1204 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
| 1205 | |
| 1206 // These only really exist to make debugging deopt problems simpler | |
| 1207 | |
| 1208 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
| 1209 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
| 1210 | |
| 1211 // The special resourceMark used during deoptimization | |
| 1212 | |
| 1213 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
| 1214 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
| 1215 | |
| 1216 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
| 1217 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
| 1218 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
| 1219 | |
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1220 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1221 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1222 |
| 0 | 1223 methodOop callee_target() const { return _callee_target; } |
| 1224 void set_callee_target (methodOop x) { _callee_target = x; } | |
| 1225 | |
| 1226 // Oop results of vm runtime calls | |
| 1227 oop vm_result() const { return _vm_result; } | |
| 1228 void set_vm_result (oop x) { _vm_result = x; } | |
| 1229 | |
| 1230 oop vm_result_2() const { return _vm_result_2; } | |
| 1231 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
| 1232 | |
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1233 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1234 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1235 |
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1236 oop graal_deopt_info() const { return _graal_deopt_info; } |
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1237 void set_graal_deopt_info(oop o) { _graal_deopt_info = o; } |
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1238 |
| 0 | 1239 // Exception handling for compiled methods |
| 1240 oop exception_oop() const { return _exception_oop; } | |
| 1241 address exception_pc() const { return _exception_pc; } | |
| 1242 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1243 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 0 | 1244 |
| 1245 void set_exception_oop(oop o) { _exception_oop = o; } | |
| 1246 void set_exception_pc(address a) { _exception_pc = a; } | |
| 1247 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
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1248 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 0 | 1249 |
| 1250 // Stack overflow support | |
| 1251 inline size_t stack_available(address cur_sp); | |
| 1252 address stack_yellow_zone_base() | |
| 1253 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
| 1254 size_t stack_yellow_zone_size() | |
| 1255 { return StackYellowPages * os::vm_page_size(); } | |
| 1256 address stack_red_zone_base() | |
| 1257 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
| 1258 size_t stack_red_zone_size() | |
| 1259 { return StackRedPages * os::vm_page_size(); } | |
| 1260 bool in_stack_yellow_zone(address a) | |
| 1261 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
| 1262 bool in_stack_red_zone(address a) | |
| 1263 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
| 1264 | |
| 1265 void create_stack_guard_pages(); | |
| 1266 void remove_stack_guard_pages(); | |
| 1267 | |
| 1268 void enable_stack_yellow_zone(); | |
| 1269 void disable_stack_yellow_zone(); | |
| 1270 void enable_stack_red_zone(); | |
| 1271 void disable_stack_red_zone(); | |
| 1272 | |
| 1273 inline bool stack_yellow_zone_disabled(); | |
| 1274 inline bool stack_yellow_zone_enabled(); | |
| 1275 | |
| 1276 // Attempt to reguard the stack after a stack overflow may have occurred. | |
| 1277 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
| 1278 // pages are already guarded, or (c) the pages were successfully reguarded. | |
| 1279 // Returns false if there is not enough stack space to reguard the pages, in | |
| 1280 // which case the caller should unwind a frame and try again. The argument | |
| 1281 // should be the caller's (approximate) sp. | |
| 1282 bool reguard_stack(address cur_sp); | |
| 1283 // Similar to above but see if current stackpoint is out of the guard area | |
| 1284 // and reguard if possible. | |
| 1285 bool reguard_stack(void); | |
| 1286 | |
| 1287 // Misc. accessors/mutators | |
| 1288 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
| 1289 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
| 1290 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
| 1291 | |
| 1292 #ifndef PRODUCT | |
| 1293 void record_jump(address target, address instr, const char* file, int line); | |
| 1294 #endif /* PRODUCT */ | |
| 1295 | |
| 1296 // For assembly stub generation | |
| 1297 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
| 1298 #ifndef PRODUCT | |
| 1299 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
| 1300 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
| 1301 #endif /* PRODUCT */ | |
| 1302 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
| 1303 static ByteSize last_Java_sp_offset() { | |
| 1304 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
| 1305 } | |
| 1306 static ByteSize last_Java_pc_offset() { | |
| 1307 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
| 1308 } | |
| 1309 static ByteSize frame_anchor_offset() { | |
| 1310 return byte_offset_of(JavaThread, _anchor); | |
| 1311 } | |
| 1312 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
| 1313 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
| 1314 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
| 1315 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
| 1316 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
| 1317 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
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1318 static ByteSize graal_deopt_info_offset() { return byte_offset_of(JavaThread, _graal_deopt_info ); } |
| 0 | 1319 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } |
| 1320 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
| 1321 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
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1322 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
| 0 | 1323 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
| 1324 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
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1325 static ByteSize graal_multinewarray_storage_offset() { return byte_offset_of(JavaThread, graal_multinewarray_storage); } |
| 0 | 1326 |
| 1327 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1328 static ByteSize should_post_on_exceptions_flag_offset() { |
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1329 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1330 } |
| 0 | 1331 |
| 342 | 1332 #ifndef SERIALGC |
| 1333 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
| 1334 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
| 1335 #endif // !SERIALGC | |
| 1336 | |
| 0 | 1337 // Returns the jni environment for this thread |
| 1338 JNIEnv* jni_environment() { return &_jni_environment; } | |
| 1339 | |
| 1340 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
| 1341 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
| 1342 // Only return NULL if thread is off the thread list; starting to | |
| 1343 // exit should not return NULL. | |
| 1344 if (thread_from_jni_env->is_terminated()) { | |
| 1345 thread_from_jni_env->block_if_vm_exited(); | |
| 1346 return NULL; | |
| 1347 } else { | |
| 1348 return thread_from_jni_env; | |
| 1349 } | |
| 1350 } | |
| 1351 | |
| 1352 // JNI critical regions. These can nest. | |
| 1353 bool in_critical() { return _jni_active_critical > 0; } | |
|
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1354 bool in_last_critical() { return _jni_active_critical == 1; } |
|
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1355 void enter_critical() { assert(Thread::current() == this || |
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1356 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(), |
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1357 "this must be current thread or synchronizing"); |
| 0 | 1358 _jni_active_critical++; } |
| 1359 void exit_critical() { assert(Thread::current() == this, | |
| 1360 "this must be current thread"); | |
| 1361 _jni_active_critical--; | |
| 1362 assert(_jni_active_critical >= 0, | |
| 1363 "JNI critical nesting problem?"); } | |
| 1364 | |
| 1365 // For deadlock detection | |
| 1366 int depth_first_number() { return _depth_first_number; } | |
| 1367 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
| 1368 | |
| 1369 private: | |
| 1370 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
| 1371 | |
| 1372 public: | |
| 1373 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
| 1374 void add_monitor_chunk(MonitorChunk* chunk); | |
| 1375 void remove_monitor_chunk(MonitorChunk* chunk); | |
| 1376 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
| 1377 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
| 1378 void dec_in_deopt_handler() { | |
| 1379 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
| 1380 if (_in_deopt_handler > 0) { // robustness | |
| 1381 _in_deopt_handler--; | |
| 1382 } | |
| 1383 } | |
| 1384 | |
| 1385 private: | |
| 1386 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
| 1387 | |
| 1388 public: | |
| 1389 | |
| 1390 // Frame iteration; calls the function f for all frames on the stack | |
| 1391 void frames_do(void f(frame*, const RegisterMap*)); | |
| 1392 | |
| 1393 // Memory operations | |
|
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1394 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1395 |
| 1396 // Sweeper operations | |
|
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1397 void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1398 |
| 1399 // Memory management operations | |
| 1400 void gc_epilogue(); | |
| 1401 void gc_prologue(); | |
| 1402 | |
| 1403 // Misc. operations | |
| 1404 char* name() const { return (char*)get_thread_name(); } | |
| 1405 void print_on(outputStream* st) const; | |
| 1406 void print() const { print_on(tty); } | |
| 1407 void print_value(); | |
| 1408 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
| 1409 void print_thread_state() const PRODUCT_RETURN; | |
| 1410 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
| 1411 void verify(); | |
| 1412 const char* get_thread_name() const; | |
| 1413 private: | |
| 1414 // factor out low-level mechanics for use in both normal and error cases | |
| 1415 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
| 1416 public: | |
| 1417 const char* get_threadgroup_name() const; | |
| 1418 const char* get_parent_name() const; | |
| 1419 | |
| 1420 // Accessing frames | |
| 1421 frame last_frame() { | |
| 1422 _anchor.make_walkable(this); | |
| 1423 return pd_last_frame(); | |
| 1424 } | |
| 1425 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
| 1426 | |
| 1427 // Returns method at 'depth' java or native frames down the stack | |
| 1428 // Used for security checks | |
| 1429 klassOop security_get_caller_class(int depth); | |
| 1430 | |
| 1431 // Print stack trace in external format | |
| 1432 void print_stack_on(outputStream* st); | |
| 1433 void print_stack() { print_stack_on(tty); } | |
| 1434 | |
| 1435 // Print stack traces in various internal formats | |
| 1436 void trace_stack() PRODUCT_RETURN; | |
| 1437 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
| 1438 void trace_frames() PRODUCT_RETURN; | |
|
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1439 void trace_oops() PRODUCT_RETURN; |
| 0 | 1440 |
|
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1441 // Print an annotated view of the stack frames |
|
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1442 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
|
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1443 void validate_frame_layout() { |
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1444 print_frame_layout(0, true); |
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1445 } |
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|
1446 |
| 0 | 1447 // Returns the number of stack frames on the stack |
| 1448 int depth() const; | |
| 1449 | |
| 1450 // Function for testing deoptimization | |
| 1451 void deoptimize(); | |
| 1452 void make_zombies(); | |
| 1453 | |
| 1454 void deoptimized_wrt_marked_nmethods(); | |
| 1455 | |
| 1456 // Profiling operation (see fprofile.cpp) | |
| 1457 public: | |
| 1458 bool profile_last_Java_frame(frame* fr); | |
| 1459 | |
| 1460 private: | |
| 1461 ThreadProfiler* _thread_profiler; | |
| 1462 private: | |
| 1463 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
| 1464 friend class FlatProfilerTask; // uses get_thread_profiler. | |
| 1465 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
| 1466 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
| 1467 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
| 1468 ThreadProfiler* result = _thread_profiler; | |
| 1469 _thread_profiler = tp; | |
| 1470 return result; | |
| 1471 } | |
| 1472 | |
| 1473 // Static operations | |
| 1474 public: | |
| 1475 // Returns the running thread as a JavaThread | |
| 1476 static inline JavaThread* current(); | |
| 1477 | |
| 1478 // Returns the active Java thread. Do not use this if you know you are calling | |
| 1479 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
| 1480 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
| 1481 // operation. You may not want that either. | |
| 1482 static JavaThread* active(); | |
| 1483 | |
| 1484 inline CompilerThread* as_CompilerThread(); | |
| 1485 | |
| 1486 public: | |
| 1487 virtual void run(); | |
| 1488 void thread_main_inner(); | |
| 1489 | |
| 1490 private: | |
| 1491 // PRIVILEGED STACK | |
| 1492 PrivilegedElement* _privileged_stack_top; | |
| 1493 GrowableArray<oop>* _array_for_gc; | |
| 1494 public: | |
| 1495 | |
| 1496 // Returns the privileged_stack information. | |
| 1497 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
| 1498 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
| 1499 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
| 1500 | |
| 1501 public: | |
| 1502 // Thread local information maintained by JVMTI. | |
| 1503 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
|
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1504 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1505 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1506 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1507 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1508 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1509 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1510 // the specified JavaThread is exiting. |
| 0 | 1511 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1512 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
| 1513 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
| 1514 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
| 1515 | |
| 1516 // JVMTI PopFrame support | |
| 1517 // Setting and clearing popframe_condition | |
| 1518 // All of these enumerated values are bits. popframe_pending | |
| 1519 // indicates that a PopFrame() has been requested and not yet been | |
| 1520 // completed. popframe_processing indicates that that PopFrame() is in | |
| 1521 // the process of being completed. popframe_force_deopt_reexecution_bit | |
| 1522 // indicates that special handling is required when returning to a | |
| 1523 // deoptimized caller. | |
| 1524 enum PopCondition { | |
| 1525 popframe_inactive = 0x00, | |
| 1526 popframe_pending_bit = 0x01, | |
| 1527 popframe_processing_bit = 0x02, | |
| 1528 popframe_force_deopt_reexecution_bit = 0x04 | |
| 1529 }; | |
| 1530 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
| 1531 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
| 1532 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
| 1533 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
| 1534 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
| 1535 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
| 1536 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
| 1537 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
| 1538 #ifdef CC_INTERP | |
| 1539 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
| 1540 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
| 1541 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
| 1542 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
| 1543 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
| 1544 #endif | |
| 1545 | |
| 1546 private: | |
| 1547 // Saved incoming arguments to popped frame. | |
| 1548 // Used only when popped interpreted frame returns to deoptimized frame. | |
| 1549 void* _popframe_preserved_args; | |
| 1550 int _popframe_preserved_args_size; | |
| 1551 | |
| 1552 public: | |
| 1553 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
| 1554 void* popframe_preserved_args(); | |
| 1555 ByteSize popframe_preserved_args_size(); | |
| 1556 WordSize popframe_preserved_args_size_in_words(); | |
| 1557 void popframe_free_preserved_args(); | |
| 1558 | |
| 1559 | |
| 1560 private: | |
| 1561 JvmtiThreadState *_jvmti_thread_state; | |
| 1562 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
| 1563 | |
| 1564 // Used by the interpreter in fullspeed mode for frame pop, method | |
| 1565 // entry, method exit and single stepping support. This field is | |
| 1566 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
| 1567 // It can be set to zero asynchronously (i.e., without a VM operation | |
| 1568 // or a lock) so we have to be very careful. | |
| 1569 int _interp_only_mode; | |
| 1570 | |
| 1571 public: | |
| 1572 // used by the interpreter for fullspeed debugging support (see above) | |
| 1573 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
| 1574 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
| 1575 int get_interp_only_mode() { return _interp_only_mode; } | |
| 1576 void increment_interp_only_mode() { ++_interp_only_mode; } | |
| 1577 void decrement_interp_only_mode() { --_interp_only_mode; } | |
| 1578 | |
|
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1579 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1580 // if this is false, we can avoid deoptimizing when events are thrown |
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1581 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1582 private: |
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1583 int _should_post_on_exceptions_flag; |
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1584 |
|
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1585 public: |
|
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1586 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1587 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1588 |
| 0 | 1589 private: |
| 1590 ThreadStatistics *_thread_stat; | |
| 1591 | |
| 1592 public: | |
| 1593 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
| 1594 | |
| 1595 // Return a blocker object for which this thread is blocked parking. | |
| 1596 oop current_park_blocker(); | |
| 1597 | |
| 1598 private: | |
| 1599 static size_t _stack_size_at_create; | |
| 1600 | |
| 1601 public: | |
| 1602 static inline size_t stack_size_at_create(void) { | |
| 1603 return _stack_size_at_create; | |
| 1604 } | |
| 1605 static inline void set_stack_size_at_create(size_t value) { | |
| 1606 _stack_size_at_create = value; | |
| 1607 } | |
| 1608 | |
| 342 | 1609 #ifndef SERIALGC |
| 1610 // SATB marking queue support | |
| 1611 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
| 1612 static SATBMarkQueueSet& satb_mark_queue_set() { | |
| 1613 return _satb_mark_queue_set; | |
| 1614 } | |
| 1615 | |
| 1616 // Dirty card queue support | |
| 1617 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
| 1618 static DirtyCardQueueSet& dirty_card_queue_set() { | |
| 1619 return _dirty_card_queue_set; | |
| 1620 } | |
| 1621 #endif // !SERIALGC | |
| 1622 | |
|
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1623 // This method initializes the SATB and dirty card queues before a |
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1624 // JavaThread is added to the Java thread list. Right now, we don't |
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1625 // have to do anything to the dirty card queue (it should have been |
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|
1626 // activated when the thread was created), but we have to activate |
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1627 // the SATB queue if the thread is created while a marking cycle is |
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|
1628 // in progress. The activation / de-activation of the SATB queues at |
|
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|
1629 // the beginning / end of a marking cycle is done during safepoints |
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|
1630 // so we have to make sure this method is called outside one to be |
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|
1631 // able to safely read the active field of the SATB queue set. Right |
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|
1632 // now, it is called just before the thread is added to the Java |
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|
1633 // thread list in the Threads::add() method. That method is holding |
|
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|
1634 // the Threads_lock which ensures we are outside a safepoint. We |
|
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|
1635 // cannot do the obvious and set the active field of the SATB queue |
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1636 // when the thread is created given that, in some cases, safepoints |
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1637 // might happen between the JavaThread constructor being called and the |
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1638 // thread being added to the Java thread list (an example of this is |
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1639 // when the structure for the DestroyJavaVM thread is created). |
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1640 #ifndef SERIALGC |
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1641 void initialize_queues(); |
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1642 #else // !SERIALGC |
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1643 void initialize_queues() { } |
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1644 #endif // !SERIALGC |
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1645 |
| 0 | 1646 // Machine dependent stuff |
| 1972 | 1647 #ifdef TARGET_OS_ARCH_linux_x86 |
| 1648 # include "thread_linux_x86.hpp" | |
| 1649 #endif | |
| 1650 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 1651 # include "thread_linux_sparc.hpp" | |
| 1652 #endif | |
| 1653 #ifdef TARGET_OS_ARCH_linux_zero | |
| 1654 # include "thread_linux_zero.hpp" | |
| 1655 #endif | |
| 1656 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 1657 # include "thread_solaris_x86.hpp" | |
| 1658 #endif | |
| 1659 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 1660 # include "thread_solaris_sparc.hpp" | |
| 1661 #endif | |
| 1662 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 1663 # include "thread_windows_x86.hpp" | |
| 1664 #endif | |
|
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1665 #ifdef TARGET_OS_ARCH_linux_arm |
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1666 # include "thread_linux_arm.hpp" |
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1667 #endif |
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1668 #ifdef TARGET_OS_ARCH_linux_ppc |
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1669 # include "thread_linux_ppc.hpp" |
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1670 #endif |
| 3960 | 1671 #ifdef TARGET_OS_ARCH_bsd_x86 |
| 1672 # include "thread_bsd_x86.hpp" | |
| 1673 #endif | |
| 1674 #ifdef TARGET_OS_ARCH_bsd_zero | |
| 1675 # include "thread_bsd_zero.hpp" | |
| 1676 #endif | |
| 1972 | 1677 |
| 0 | 1678 |
| 1679 public: | |
| 1680 void set_blocked_on_compilation(bool value) { | |
| 1681 _blocked_on_compilation = value; | |
| 1682 } | |
| 1683 | |
| 1684 bool blocked_on_compilation() { | |
| 1685 return _blocked_on_compilation; | |
| 1686 } | |
| 1687 protected: | |
| 1688 bool _blocked_on_compilation; | |
| 1689 | |
| 1690 | |
| 1691 // JSR166 per-thread parker | |
| 1692 private: | |
| 1693 Parker* _parker; | |
| 1694 public: | |
| 1695 Parker* parker() { return _parker; } | |
| 1696 | |
| 1697 // Biased locking support | |
| 1698 private: | |
| 1699 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
| 1700 public: | |
| 1701 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
| 1702 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
| 1703 | |
| 1704 // clearing/querying jni attach status | |
| 4006 | 1705 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } |
| 1706 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } | |
| 1707 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); } | |
| 342 | 1708 private: |
| 1709 // This field is used to determine if a thread has claimed | |
| 1710 // a par_id: it is -1 if the thread has not claimed a par_id; | |
| 1711 // otherwise its value is the par_id that has been claimed. | |
| 1712 int _claimed_par_id; | |
| 1713 public: | |
| 1714 int get_claimed_par_id() { return _claimed_par_id; } | |
| 1715 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
| 0 | 1716 }; |
| 1717 | |
| 1718 // Inline implementation of JavaThread::current | |
| 1719 inline JavaThread* JavaThread::current() { | |
| 1720 Thread* thread = ThreadLocalStorage::thread(); | |
| 1721 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
| 1722 return (JavaThread*)thread; | |
| 1723 } | |
| 1724 | |
| 1725 inline CompilerThread* JavaThread::as_CompilerThread() { | |
| 1726 assert(is_Compiler_thread(), "just checking"); | |
| 1727 return (CompilerThread*)this; | |
| 1728 } | |
| 1729 | |
| 1730 inline bool JavaThread::stack_yellow_zone_disabled() { | |
| 1731 return _stack_guard_state == stack_guard_yellow_disabled; | |
| 1732 } | |
| 1733 | |
| 1734 inline bool JavaThread::stack_yellow_zone_enabled() { | |
| 1735 #ifdef ASSERT | |
| 1736 if (os::uses_stack_guard_pages()) { | |
| 1737 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
| 1738 } | |
| 1739 #endif | |
| 1740 return _stack_guard_state == stack_guard_enabled; | |
| 1741 } | |
| 1742 | |
| 1743 inline size_t JavaThread::stack_available(address cur_sp) { | |
| 1744 // This code assumes java stacks grow down | |
| 1745 address low_addr; // Limit on the address for deepest stack depth | |
| 1746 if ( _stack_guard_state == stack_guard_unused) { | |
| 1747 low_addr = stack_base() - stack_size(); | |
| 1748 } else { | |
| 1749 low_addr = stack_yellow_zone_base(); | |
| 1750 } | |
| 1751 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
| 1752 } | |
| 1753 | |
| 1754 // A thread used for Compilation. | |
| 1755 class CompilerThread : public JavaThread { | |
| 1756 friend class VMStructs; | |
| 1757 private: | |
| 1758 CompilerCounters* _counters; | |
| 1759 | |
| 1760 CompileLog* _log; | |
| 1761 CompileTask* _task; | |
| 1762 CompileQueue* _queue; | |
| 1763 | |
|
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1764 |
| 0 | 1765 public: |
| 1766 | |
| 1767 static CompilerThread* current(); | |
| 1768 | |
| 1769 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
| 1770 | |
| 1771 bool is_Compiler_thread() const { return true; } | |
| 1772 // Hide this compiler thread from external view. | |
|
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1773 // (tw) For Graal, the compiler thread should be visible. |
|
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1774 bool is_hidden_from_external_view() const { |
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1775 #ifdef GRAAL |
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1776 return !DebugGraal; |
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1777 #else |
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1778 return true; |
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1779 #endif |
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1780 } |
| 0 | 1781 |
| 1782 CompileQueue* queue() { return _queue; } | |
| 1783 CompilerCounters* counters() { return _counters; } | |
| 1784 | |
| 1785 // Get/set the thread's logging information | |
| 1786 CompileLog* log() { return _log; } | |
| 1787 void init_log(CompileLog* log) { | |
| 1788 // Set once, for good. | |
| 1789 assert(_log == NULL, "set only once"); | |
| 1790 _log = log; | |
| 1791 } | |
| 1792 | |
| 1793 #ifndef PRODUCT | |
| 1794 private: | |
| 1795 IdealGraphPrinter *_ideal_graph_printer; | |
| 1796 public: | |
| 1797 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
| 1798 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
| 1799 #endif | |
| 1800 | |
| 1801 // Get/set the thread's current task | |
| 1802 CompileTask* task() { return _task; } | |
| 1803 void set_task(CompileTask* task) { _task = task; } | |
| 1804 }; | |
| 1805 | |
| 1806 inline CompilerThread* CompilerThread::current() { | |
| 1807 return JavaThread::current()->as_CompilerThread(); | |
| 1808 } | |
| 1809 | |
| 1810 | |
| 1811 // The active thread queue. It also keeps track of the current used | |
| 1812 // thread priorities. | |
| 1813 class Threads: AllStatic { | |
| 1814 friend class VMStructs; | |
| 1815 private: | |
| 1816 static JavaThread* _thread_list; | |
| 1817 static int _number_of_threads; | |
| 1818 static int _number_of_non_daemon_threads; | |
| 1819 static int _return_code; | |
| 1820 | |
| 1821 public: | |
| 1822 // Thread management | |
| 1823 // force_daemon is a concession to JNI, where we may need to add a | |
| 1824 // thread to the thread list before allocating its thread object | |
| 1825 static void add(JavaThread* p, bool force_daemon = false); | |
| 1826 static void remove(JavaThread* p); | |
| 1827 static bool includes(JavaThread* p); | |
| 1828 static JavaThread* first() { return _thread_list; } | |
| 1829 static void threads_do(ThreadClosure* tc); | |
| 1830 | |
| 1831 // Initializes the vm and creates the vm thread | |
| 1832 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
| 1833 static void convert_vm_init_libraries_to_agents(); | |
| 1834 static void create_vm_init_libraries(); | |
| 1835 static void create_vm_init_agents(); | |
| 1836 static void shutdown_vm_agents(); | |
| 1837 static bool destroy_vm(); | |
| 1838 // Supported VM versions via JNI | |
| 1839 // Includes JNI_VERSION_1_1 | |
| 1840 static jboolean is_supported_jni_version_including_1_1(jint version); | |
| 1841 // Does not include JNI_VERSION_1_1 | |
| 1842 static jboolean is_supported_jni_version(jint version); | |
| 1843 | |
| 1844 // Garbage collection | |
| 1845 static void follow_other_roots(void f(oop*)); | |
| 1846 | |
| 1847 // Apply "f->do_oop" to all root oops in all threads. | |
| 1848 // This version may only be called by sequential code. | |
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1849 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1850 // This version may be called by sequential or parallel code. |
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1851 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1852 // This creates a list of GCTasks, one per thread. |
| 1853 static void create_thread_roots_tasks(GCTaskQueue* q); | |
| 1854 // This creates a list of GCTasks, one per thread, for marking objects. | |
| 1855 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
| 1856 | |
| 1857 // Apply "f->do_oop" to roots in all threads that | |
| 1858 // are part of compiled frames | |
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1859 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 0 | 1860 |
| 1861 static void convert_hcode_pointers(); | |
| 1862 static void restore_hcode_pointers(); | |
| 1863 | |
| 1864 // Sweeper | |
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1865 static void nmethods_do(CodeBlobClosure* cf); |
| 0 | 1866 |
| 1867 static void gc_epilogue(); | |
| 1868 static void gc_prologue(); | |
| 1869 | |
| 1870 // Verification | |
| 1871 static void verify(); | |
| 1872 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
| 1873 static void print(bool print_stacks, bool internal_format) { | |
| 1874 // this function is only used by debug.cpp | |
| 1875 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
| 1876 } | |
| 1877 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
| 1878 | |
| 1879 // Get Java threads that are waiting to enter a monitor. If doLock | |
| 1880 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1881 // VM needs to be at a safepoint. | |
| 1882 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
| 1883 address monitor, bool doLock); | |
| 1884 | |
| 1885 // Get owning Java thread from the monitor's owner field. If doLock | |
| 1886 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
| 1887 // VM needs to be at a safepoint. | |
| 1888 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
| 1889 bool doLock); | |
| 1890 | |
| 1891 // Number of threads on the active threads list | |
| 1892 static int number_of_threads() { return _number_of_threads; } | |
| 1893 // Number of non-daemon threads on the active threads list | |
| 1894 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
| 1895 | |
| 1896 // Deoptimizes all frames tied to marked nmethods | |
| 1897 static void deoptimized_wrt_marked_nmethods(); | |
| 1898 | |
| 1899 }; | |
| 1900 | |
| 1901 | |
| 1902 // Thread iterator | |
| 1903 class ThreadClosure: public StackObj { | |
| 1904 public: | |
| 1905 virtual void do_thread(Thread* thread) = 0; | |
| 1906 }; | |
| 1907 | |
| 1908 class SignalHandlerMark: public StackObj { | |
| 1909 private: | |
| 1910 Thread* _thread; | |
| 1911 public: | |
| 1912 SignalHandlerMark(Thread* t) { | |
| 1913 _thread = t; | |
| 1914 if (_thread) _thread->enter_signal_handler(); | |
| 1915 } | |
| 1916 ~SignalHandlerMark() { | |
| 1917 if (_thread) _thread->leave_signal_handler(); | |
| 1918 _thread = NULL; | |
| 1919 } | |
| 1920 }; | |
| 1921 | |
| 1972 | 1922 |
| 1923 #endif // SHARE_VM_RUNTIME_THREAD_HPP |