1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP 26 #define SHARE_VM_RUNTIME_THREAD_HPP 27 28 #include "jni.h" 29 #include "gc/shared/threadLocalAllocBuffer.hpp" 30 #include "memory/allocation.hpp" 31 #include "oops/oop.hpp" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/handshake.hpp" 35 #include "runtime/javaFrameAnchor.hpp" 36 #include "runtime/jniHandles.hpp" 37 #include "runtime/mutexLocker.hpp" 38 #include "runtime/os.hpp" 39 #include "runtime/osThread.hpp" 40 #include "runtime/park.hpp" 41 #include "runtime/safepoint.hpp" 42 #include "runtime/stubRoutines.hpp" 43 #include "runtime/threadLocalStorage.hpp" 44 #include "runtime/thread_ext.hpp" 45 #include "runtime/unhandledOops.hpp" 46 #include "trace/traceBackend.hpp" 47 #include "trace/traceMacros.hpp" 48 #include "utilities/align.hpp" 49 #include "utilities/exceptions.hpp" 50 #include "utilities/macros.hpp" 51 #if INCLUDE_ALL_GCS 52 #include "gc/g1/dirtyCardQueue.hpp" 53 #include "gc/g1/satbMarkQueue.hpp" 54 #endif // INCLUDE_ALL_GCS 55 #ifdef ZERO 56 # include "stack_zero.hpp" 57 #endif 58 59 class ThreadSafepointState; 60 class ThreadsList; 61 class NestedThreadsList; 62 63 class JvmtiThreadState; 64 class JvmtiGetLoadedClassesClosure; 65 class ThreadStatistics; 66 class ConcurrentLocksDump; 67 class ParkEvent; 68 class Parker; 69 70 class ciEnv; 71 class CompileThread; 72 class CompileLog; 73 class CompileTask; 74 class CompileQueue; 75 class CompilerCounters; 76 class vframeArray; 77 78 class DeoptResourceMark; 79 class jvmtiDeferredLocalVariableSet; 80 81 class GCTaskQueue; 82 class ThreadClosure; 83 class IdealGraphPrinter; 84 85 class Metadata; 86 template <class T, MEMFLAGS F> class ChunkedList; 87 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; 88 89 DEBUG_ONLY(class ResourceMark;) 90 91 class WorkerThread; 92 93 // Class hierarchy 94 // - Thread 95 // - NamedThread 96 // - VMThread 97 // - ConcurrentGCThread 98 // - WorkerThread 99 // - GangWorker 100 // - GCTaskThread 101 // - JavaThread 102 // - various subclasses eg CompilerThread, ServiceThread 103 // - WatcherThread 104 105 class Thread: public ThreadShadow { 106 friend class Threads; 107 friend class VMStructs; 108 friend class JVMCIVMStructs; 109 private: 110 111 #ifndef USE_LIBRARY_BASED_TLS_ONLY 112 // Current thread is maintained as a thread-local variable 113 static THREAD_LOCAL_DECL Thread* _thr_current; 114 #endif 115 116 // Exception handling 117 // (Note: _pending_exception and friends are in ThreadShadow) 118 //oop _pending_exception; // pending exception for current thread 119 // const char* _exception_file; // file information for exception (debugging only) 120 // int _exception_line; // line information for exception (debugging only) 121 protected: 122 // Support for forcing alignment of thread objects for biased locking 123 void* _real_malloc_address; 124 // JavaThread lifecycle support: 125 friend class ScanHazardPtrGatherProtectedThreadsClosure; 126 friend class ScanHazardPtrGatherThreadsListClosure; 127 friend class ScanHazardPtrPrintMatchingThreadsClosure; 128 friend class ThreadsListHandle; 129 friend class ThreadsListSetter; 130 ThreadsList* volatile _threads_hazard_ptr; 131 ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); 132 ThreadsList* get_threads_hazard_ptr(); 133 void set_threads_hazard_ptr(ThreadsList* new_list); 134 static bool is_hazard_ptr_tagged(ThreadsList* list) { 135 return (intptr_t(list) & intptr_t(1)) == intptr_t(1); 136 } 137 static ThreadsList* tag_hazard_ptr(ThreadsList* list) { 138 return (ThreadsList*)(intptr_t(list) | intptr_t(1)); 139 } 140 static ThreadsList* untag_hazard_ptr(ThreadsList* list) { 141 return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); 142 } 143 NestedThreadsList* _nested_threads_hazard_ptr; 144 NestedThreadsList* get_nested_threads_hazard_ptr() { 145 return _nested_threads_hazard_ptr; 146 } 147 void set_nested_threads_hazard_ptr(NestedThreadsList* value) { 148 assert(Threads_lock->owned_by_self(), 149 "must own Threads_lock for _nested_threads_hazard_ptr to be valid."); 150 _nested_threads_hazard_ptr = value; 151 } 152 // This field is enabled via -XX:+EnableThreadSMRStatistics: 153 uint _nested_threads_hazard_ptr_cnt; 154 void dec_nested_threads_hazard_ptr_cnt() { 155 assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); 156 _nested_threads_hazard_ptr_cnt--; 157 } 158 void inc_nested_threads_hazard_ptr_cnt() { 159 _nested_threads_hazard_ptr_cnt++; 160 } 161 uint nested_threads_hazard_ptr_cnt() { 162 return _nested_threads_hazard_ptr_cnt; 163 } 164 165 public: 166 void* operator new(size_t size) throw() { return allocate(size, true); } 167 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 168 return allocate(size, false); } 169 void operator delete(void* p); 170 171 protected: 172 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); 173 private: 174 175 // *************************************************************** 176 // Suspend and resume support 177 // *************************************************************** 178 // 179 // VM suspend/resume no longer exists - it was once used for various 180 // things including safepoints but was deprecated and finally removed 181 // in Java 7. Because VM suspension was considered "internal" Java-level 182 // suspension was considered "external", and this legacy naming scheme 183 // remains. 184 // 185 // External suspend/resume requests come from JVM_SuspendThread, 186 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI 187 // ResumeThread. External 188 // suspend requests cause _external_suspend to be set and external 189 // resume requests cause _external_suspend to be cleared. 190 // External suspend requests do not nest on top of other external 191 // suspend requests. The higher level APIs reject suspend requests 192 // for already suspended threads. 193 // 194 // The external_suspend 195 // flag is checked by has_special_runtime_exit_condition() and java thread 196 // will self-suspend when handle_special_runtime_exit_condition() is 197 // called. Most uses of the _thread_blocked state in JavaThreads are 198 // considered the same as being externally suspended; if the blocking 199 // condition lifts, the JavaThread will self-suspend. Other places 200 // where VM checks for external_suspend include: 201 // + mutex granting (do not enter monitors when thread is suspended) 202 // + state transitions from _thread_in_native 203 // 204 // In general, java_suspend() does not wait for an external suspend 205 // request to complete. When it returns, the only guarantee is that 206 // the _external_suspend field is true. 207 // 208 // wait_for_ext_suspend_completion() is used to wait for an external 209 // suspend request to complete. External suspend requests are usually 210 // followed by some other interface call that requires the thread to 211 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into 212 // the interface that requires quiescence, we give the JavaThread a 213 // chance to self-suspend before we need it to be quiescent. This 214 // improves overall suspend/query performance. 215 // 216 // _suspend_flags controls the behavior of java_ suspend/resume. 217 // It must be set under the protection of SR_lock. Read from the flag is 218 // OK without SR_lock as long as the value is only used as a hint. 219 // (e.g., check _external_suspend first without lock and then recheck 220 // inside SR_lock and finish the suspension) 221 // 222 // _suspend_flags is also overloaded for other "special conditions" so 223 // that a single check indicates whether any special action is needed 224 // eg. for async exceptions. 225 // ------------------------------------------------------------------- 226 // Notes: 227 // 1. The suspend/resume logic no longer uses ThreadState in OSThread 228 // but we still update its value to keep other part of the system (mainly 229 // JVMTI) happy. ThreadState is legacy code (see notes in 230 // osThread.hpp). 231 // 232 // 2. It would be more natural if set_external_suspend() is private and 233 // part of java_suspend(), but that probably would affect the suspend/query 234 // performance. Need more investigation on this. 235 236 // suspend/resume lock: used for self-suspend 237 Monitor* _SR_lock; 238 239 protected: 240 enum SuspendFlags { 241 // NOTE: avoid using the sign-bit as cc generates different test code 242 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 243 244 _external_suspend = 0x20000000U, // thread is asked to self suspend 245 _ext_suspended = 0x40000000U, // thread has self-suspended 246 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt 247 248 _has_async_exception = 0x00000001U, // there is a pending async exception 249 _critical_native_unlock = 0x00000002U, // Must call back to unlock JNI critical lock 250 251 _trace_flag = 0x00000004U // call tracing backend 252 }; 253 254 // various suspension related flags - atomically updated 255 // overloaded for async exception checking in check_special_condition_for_native_trans. 256 volatile uint32_t _suspend_flags; 257 258 private: 259 int _num_nested_signal; 260 261 DEBUG_ONLY(bool _suspendible_thread;) 262 263 public: 264 void enter_signal_handler() { _num_nested_signal++; } 265 void leave_signal_handler() { _num_nested_signal--; } 266 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } 267 268 #ifdef ASSERT 269 void set_suspendible_thread() { 270 _suspendible_thread = true; 271 } 272 273 void clear_suspendible_thread() { 274 _suspendible_thread = false; 275 } 276 277 bool is_suspendible_thread() { return _suspendible_thread; } 278 #endif 279 280 private: 281 // Active_handles points to a block of handles 282 JNIHandleBlock* _active_handles; 283 284 // One-element thread local free list 285 JNIHandleBlock* _free_handle_block; 286 287 // Point to the last handle mark 288 HandleMark* _last_handle_mark; 289 290 // The parity of the last strong_roots iteration in which this thread was 291 // claimed as a task. 292 int _oops_do_parity; 293 294 public: 295 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } 296 HandleMark* last_handle_mark() const { return _last_handle_mark; } 297 private: 298 299 // debug support for checking if code does allow safepoints or not 300 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on 301 // mutex, or blocking on an object synchronizer (Java locking). 302 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases 303 // If !allow_allocation(), then an assertion failure will happen during allocation 304 // (Hence, !allow_safepoint() => !allow_allocation()). 305 // 306 // The two classes NoSafepointVerifier and No_Allocation_Verifier are used to set these counters. 307 // 308 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen 309 debug_only(int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. 310 311 // Used by SkipGCALot class. 312 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? 313 314 friend class NoAllocVerifier; 315 friend class NoSafepointVerifier; 316 friend class PauseNoSafepointVerifier; 317 friend class GCLocker; 318 319 volatile void* _polling_page; // Thread local polling page 320 321 ThreadLocalAllocBuffer _tlab; // Thread-local eden 322 jlong _allocated_bytes; // Cumulative number of bytes allocated on 323 // the Java heap 324 325 mutable TRACE_DATA _trace_data; // Thread-local data for tracing 326 327 ThreadExt _ext; 328 329 int _vm_operation_started_count; // VM_Operation support 330 int _vm_operation_completed_count; // VM_Operation support 331 332 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread 333 // is waiting to lock 334 bool _current_pending_monitor_is_from_java; // locking is from Java code 335 336 // ObjectMonitor on which this thread called Object.wait() 337 ObjectMonitor* _current_waiting_monitor; 338 339 // Private thread-local objectmonitor list - a simple cache organized as a SLL. 340 public: 341 ObjectMonitor* omFreeList; 342 int omFreeCount; // length of omFreeList 343 int omFreeProvision; // reload chunk size 344 ObjectMonitor* omInUseList; // SLL to track monitors in circulation 345 int omInUseCount; // length of omInUseList 346 347 #ifdef ASSERT 348 private: 349 bool _visited_for_critical_count; 350 351 public: 352 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } 353 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } 354 #endif 355 356 public: 357 enum { 358 is_definitely_current_thread = true 359 }; 360 361 // Constructor 362 Thread(); 363 virtual ~Thread(); 364 365 // Manage Thread::current() 366 void initialize_thread_current(); 367 void clear_thread_current(); // TLS cleanup needed before threads terminate 368 369 public: 370 // thread entry point 371 virtual void run(); 372 373 // Testers 374 virtual bool is_VM_thread() const { return false; } 375 virtual bool is_Java_thread() const { return false; } 376 virtual bool is_Compiler_thread() const { return false; } 377 virtual bool is_Code_cache_sweeper_thread() const { return false; } 378 virtual bool is_hidden_from_external_view() const { return false; } 379 virtual bool is_jvmti_agent_thread() const { return false; } 380 // True iff the thread can perform GC operations at a safepoint. 381 // Generally will be true only of VM thread and parallel GC WorkGang 382 // threads. 383 virtual bool is_GC_task_thread() const { return false; } 384 virtual bool is_Watcher_thread() const { return false; } 385 virtual bool is_ConcurrentGC_thread() const { return false; } 386 virtual bool is_Named_thread() const { return false; } 387 virtual bool is_Worker_thread() const { return false; } 388 389 // Can this thread make Java upcalls 390 virtual bool can_call_java() const { return false; } 391 392 // Casts 393 virtual WorkerThread* as_Worker_thread() const { return NULL; } 394 395 virtual char* name() const { return (char*)"Unknown thread"; } 396 397 // Returns the current thread (ASSERTS if NULL) 398 static inline Thread* current(); 399 // Returns the current thread, or NULL if not attached 400 static inline Thread* current_or_null(); 401 // Returns the current thread, or NULL if not attached, and is 402 // safe for use from signal-handlers 403 static inline Thread* current_or_null_safe(); 404 405 // Common thread operations 406 #ifdef ASSERT 407 static void check_for_dangling_thread_pointer(Thread *thread); 408 #endif 409 static void set_priority(Thread* thread, ThreadPriority priority); 410 static ThreadPriority get_priority(const Thread* const thread); 411 static void start(Thread* thread); 412 static void interrupt(Thread* thr); 413 static bool is_interrupted(Thread* thr, bool clear_interrupted); 414 415 void set_native_thread_name(const char *name) { 416 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); 417 os::set_native_thread_name(name); 418 } 419 420 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } 421 Monitor* SR_lock() const { return _SR_lock; } 422 423 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } 424 425 inline void set_suspend_flag(SuspendFlags f); 426 inline void clear_suspend_flag(SuspendFlags f); 427 428 inline void set_has_async_exception(); 429 inline void clear_has_async_exception(); 430 431 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } 432 433 inline void set_critical_native_unlock(); 434 inline void clear_critical_native_unlock(); 435 436 inline void set_trace_flag(); 437 inline void clear_trace_flag(); 438 439 // Support for Unhandled Oop detection 440 // Add the field for both, fastdebug and debug, builds to keep 441 // Thread's fields layout the same. 442 // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. 443 #ifdef CHECK_UNHANDLED_OOPS 444 private: 445 UnhandledOops* _unhandled_oops; 446 #elif defined(ASSERT) 447 private: 448 void* _unhandled_oops; 449 #endif 450 #ifdef CHECK_UNHANDLED_OOPS 451 public: 452 UnhandledOops* unhandled_oops() { return _unhandled_oops; } 453 // Mark oop safe for gc. It may be stack allocated but won't move. 454 void allow_unhandled_oop(oop *op) { 455 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); 456 } 457 // Clear oops at safepoint so crashes point to unhandled oop violator 458 void clear_unhandled_oops() { 459 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); 460 } 461 #endif // CHECK_UNHANDLED_OOPS 462 463 public: 464 #ifndef PRODUCT 465 bool skip_gcalot() { return _skip_gcalot; } 466 void set_skip_gcalot(bool v) { _skip_gcalot = v; } 467 #endif 468 469 // Installs a pending exception to be inserted later 470 static void send_async_exception(oop thread_oop, oop java_throwable); 471 472 // Resource area 473 ResourceArea* resource_area() const { return _resource_area; } 474 void set_resource_area(ResourceArea* area) { _resource_area = area; } 475 476 OSThread* osthread() const { return _osthread; } 477 void set_osthread(OSThread* thread) { _osthread = thread; } 478 479 // JNI handle support 480 JNIHandleBlock* active_handles() const { return _active_handles; } 481 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } 482 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } 483 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } 484 485 // Internal handle support 486 HandleArea* handle_area() const { return _handle_area; } 487 void set_handle_area(HandleArea* area) { _handle_area = area; } 488 489 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } 490 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } 491 492 // Thread-Local Allocation Buffer (TLAB) support 493 ThreadLocalAllocBuffer& tlab() { return _tlab; } 494 void initialize_tlab() { 495 if (UseTLAB) { 496 tlab().initialize(); 497 } 498 } 499 500 jlong allocated_bytes() { return _allocated_bytes; } 501 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } 502 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } 503 inline jlong cooked_allocated_bytes(); 504 505 TRACE_DEFINE_THREAD_TRACE_DATA_OFFSET; 506 TRACE_DATA* trace_data() const { return &_trace_data; } 507 bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } 508 509 const ThreadExt& ext() const { return _ext; } 510 ThreadExt& ext() { return _ext; } 511 512 // VM operation support 513 int vm_operation_ticket() { return ++_vm_operation_started_count; } 514 int vm_operation_completed_count() { return _vm_operation_completed_count; } 515 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } 516 517 // For tracking the heavyweight monitor the thread is pending on. 518 ObjectMonitor* current_pending_monitor() { 519 return _current_pending_monitor; 520 } 521 void set_current_pending_monitor(ObjectMonitor* monitor) { 522 _current_pending_monitor = monitor; 523 } 524 void set_current_pending_monitor_is_from_java(bool from_java) { 525 _current_pending_monitor_is_from_java = from_java; 526 } 527 bool current_pending_monitor_is_from_java() { 528 return _current_pending_monitor_is_from_java; 529 } 530 531 // For tracking the ObjectMonitor on which this thread called Object.wait() 532 ObjectMonitor* current_waiting_monitor() { 533 return _current_waiting_monitor; 534 } 535 void set_current_waiting_monitor(ObjectMonitor* monitor) { 536 _current_waiting_monitor = monitor; 537 } 538 539 // GC support 540 // Apply "f->do_oop" to all root oops in "this". 541 // Used by JavaThread::oops_do. 542 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames 543 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); 544 545 // Handles the parallel case for the method below. 546 private: 547 bool claim_oops_do_par_case(int collection_parity); 548 public: 549 // Requires that "collection_parity" is that of the current roots 550 // iteration. If "is_par" is false, sets the parity of "this" to 551 // "collection_parity", and returns "true". If "is_par" is true, 552 // uses an atomic instruction to set the current threads parity to 553 // "collection_parity", if it is not already. Returns "true" iff the 554 // calling thread does the update, this indicates that the calling thread 555 // has claimed the thread's stack as a root groop in the current 556 // collection. 557 bool claim_oops_do(bool is_par, int collection_parity) { 558 if (!is_par) { 559 _oops_do_parity = collection_parity; 560 return true; 561 } else { 562 return claim_oops_do_par_case(collection_parity); 563 } 564 } 565 566 // jvmtiRedefineClasses support 567 void metadata_handles_do(void f(Metadata*)); 568 569 // Used by fast lock support 570 virtual bool is_lock_owned(address adr) const; 571 572 // Check if address is in the stack of the thread (not just for locks). 573 // Warning: the method can only be used on the running thread 574 bool is_in_stack(address adr) const; 575 // Check if address is in the usable part of the stack (excludes protected 576 // guard pages) 577 bool is_in_usable_stack(address adr) const; 578 579 // Sets this thread as starting thread. Returns failure if thread 580 // creation fails due to lack of memory, too many threads etc. 581 bool set_as_starting_thread(); 582 583 protected: 584 // OS data associated with the thread 585 OSThread* _osthread; // Platform-specific thread information 586 587 // Thread local resource area for temporary allocation within the VM 588 ResourceArea* _resource_area; 589 590 DEBUG_ONLY(ResourceMark* _current_resource_mark;) 591 592 // Thread local handle area for allocation of handles within the VM 593 HandleArea* _handle_area; 594 GrowableArray<Metadata*>* _metadata_handles; 595 596 // Support for stack overflow handling, get_thread, etc. 597 address _stack_base; 598 size_t _stack_size; 599 uintptr_t _self_raw_id; // used by get_thread (mutable) 600 int _lgrp_id; 601 602 volatile void** polling_page_addr() { return &_polling_page; } 603 604 public: 605 // Stack overflow support 606 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } 607 void set_stack_base(address base) { _stack_base = base; } 608 size_t stack_size() const { return _stack_size; } 609 void set_stack_size(size_t size) { _stack_size = size; } 610 address stack_end() const { return stack_base() - stack_size(); } 611 void record_stack_base_and_size(); 612 613 bool on_local_stack(address adr) const { 614 // QQQ this has knowledge of direction, ought to be a stack method 615 return (_stack_base >= adr && adr >= stack_end()); 616 } 617 618 uintptr_t self_raw_id() { return _self_raw_id; } 619 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } 620 621 int lgrp_id() const { return _lgrp_id; } 622 void set_lgrp_id(int value) { _lgrp_id = value; } 623 624 // Printing 625 virtual void print_on(outputStream* st) const; 626 virtual void print_nested_threads_hazard_ptrs_on(outputStream* st) const; 627 void print() const { print_on(tty); } 628 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; 629 void print_value_on(outputStream* st) const; 630 631 // Debug-only code 632 #ifdef ASSERT 633 private: 634 // Deadlock detection support for Mutex locks. List of locks own by thread. 635 Monitor* _owned_locks; 636 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, 637 // thus the friendship 638 friend class Mutex; 639 friend class Monitor; 640 641 public: 642 void print_owned_locks_on(outputStream* st) const; 643 void print_owned_locks() const { print_owned_locks_on(tty); } 644 Monitor* owned_locks() const { return _owned_locks; } 645 bool owns_locks() const { return owned_locks() != NULL; } 646 bool owns_locks_but_compiled_lock() const; 647 int oops_do_parity() const { return _oops_do_parity; } 648 649 // Deadlock detection 650 bool allow_allocation() { return _allow_allocation_count == 0; } 651 ResourceMark* current_resource_mark() { return _current_resource_mark; } 652 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } 653 #endif 654 655 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; 656 657 private: 658 volatile int _jvmti_env_iteration_count; 659 660 public: 661 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } 662 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } 663 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } 664 665 // Code generation 666 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file); } 667 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line); } 668 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles); } 669 670 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base); } 671 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size); } 672 673 static ByteSize polling_page_offset() { return byte_offset_of(Thread, _polling_page); } 674 675 #define TLAB_FIELD_OFFSET(name) \ 676 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } 677 678 TLAB_FIELD_OFFSET(start) 679 TLAB_FIELD_OFFSET(end) 680 TLAB_FIELD_OFFSET(top) 681 TLAB_FIELD_OFFSET(pf_top) 682 TLAB_FIELD_OFFSET(size) // desired_size 683 TLAB_FIELD_OFFSET(refill_waste_limit) 684 TLAB_FIELD_OFFSET(number_of_refills) 685 TLAB_FIELD_OFFSET(fast_refill_waste) 686 TLAB_FIELD_OFFSET(slow_allocations) 687 688 #undef TLAB_FIELD_OFFSET 689 690 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes); } 691 692 public: 693 volatile intptr_t _Stalled; 694 volatile int _TypeTag; 695 ParkEvent * _ParkEvent; // for synchronized() 696 ParkEvent * _SleepEvent; // for Thread.sleep 697 ParkEvent * _MutexEvent; // for native internal Mutex/Monitor 698 ParkEvent * _MuxEvent; // for low-level muxAcquire-muxRelease 699 int NativeSyncRecursion; // diagnostic 700 701 volatile int _OnTrap; // Resume-at IP delta 702 jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG 703 jint _hashStateX; // thread-specific hashCode generator state 704 jint _hashStateY; 705 jint _hashStateZ; 706 void * _schedctl; 707 708 709 volatile jint rng[4]; // RNG for spin loop 710 711 // Low-level leaf-lock primitives used to implement synchronization 712 // and native monitor-mutex infrastructure. 713 // Not for general synchronization use. 714 static void SpinAcquire(volatile int * Lock, const char * Name); 715 static void SpinRelease(volatile int * Lock); 716 static void muxAcquire(volatile intptr_t * Lock, const char * Name); 717 static void muxAcquireW(volatile intptr_t * Lock, ParkEvent * ev); 718 static void muxRelease(volatile intptr_t * Lock); 719 }; 720 721 // Inline implementation of Thread::current() 722 inline Thread* Thread::current() { 723 Thread* current = current_or_null(); 724 assert(current != NULL, "Thread::current() called on detached thread"); 725 return current; 726 } 727 728 inline Thread* Thread::current_or_null() { 729 #ifndef USE_LIBRARY_BASED_TLS_ONLY 730 return _thr_current; 731 #else 732 if (ThreadLocalStorage::is_initialized()) { 733 return ThreadLocalStorage::thread(); 734 } 735 return NULL; 736 #endif 737 } 738 739 inline Thread* Thread::current_or_null_safe() { 740 if (ThreadLocalStorage::is_initialized()) { 741 return ThreadLocalStorage::thread(); 742 } 743 return NULL; 744 } 745 746 // Name support for threads. non-JavaThread subclasses with multiple 747 // uniquely named instances should derive from this. 748 class NamedThread: public Thread { 749 friend class VMStructs; 750 enum { 751 max_name_len = 64 752 }; 753 private: 754 char* _name; 755 // log JavaThread being processed by oops_do 756 JavaThread* _processed_thread; 757 uint _gc_id; // The current GC id when a thread takes part in GC 758 759 public: 760 NamedThread(); 761 ~NamedThread(); 762 // May only be called once per thread. 763 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); 764 void initialize_named_thread(); 765 virtual bool is_Named_thread() const { return true; } 766 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } 767 JavaThread *processed_thread() { return _processed_thread; } 768 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } 769 virtual void print_on(outputStream* st) const; 770 771 void set_gc_id(uint gc_id) { _gc_id = gc_id; } 772 uint gc_id() { return _gc_id; } 773 }; 774 775 // Worker threads are named and have an id of an assigned work. 776 class WorkerThread: public NamedThread { 777 private: 778 uint _id; 779 public: 780 WorkerThread() : _id(0) { } 781 virtual bool is_Worker_thread() const { return true; } 782 783 virtual WorkerThread* as_Worker_thread() const { 784 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); 785 return (WorkerThread*) this; 786 } 787 788 void set_id(uint work_id) { _id = work_id; } 789 uint id() const { return _id; } 790 }; 791 792 // A single WatcherThread is used for simulating timer interrupts. 793 class WatcherThread: public Thread { 794 friend class VMStructs; 795 public: 796 virtual void run(); 797 798 private: 799 static WatcherThread* _watcher_thread; 800 801 static bool _startable; 802 // volatile due to at least one lock-free read 803 volatile static bool _should_terminate; 804 public: 805 enum SomeConstants { 806 delay_interval = 10 // interrupt delay in milliseconds 807 }; 808 809 // Constructor 810 WatcherThread(); 811 812 // No destruction allowed 813 ~WatcherThread() { 814 guarantee(false, "WatcherThread deletion must fix the race with VM termination"); 815 } 816 817 // Tester 818 bool is_Watcher_thread() const { return true; } 819 820 // Printing 821 char* name() const { return (char*)"VM Periodic Task Thread"; } 822 void print_on(outputStream* st) const; 823 void unpark(); 824 825 // Returns the single instance of WatcherThread 826 static WatcherThread* watcher_thread() { return _watcher_thread; } 827 828 // Create and start the single instance of WatcherThread, or stop it on shutdown 829 static void start(); 830 static void stop(); 831 // Only allow start once the VM is sufficiently initialized 832 // Otherwise the first task to enroll will trigger the start 833 static void make_startable(); 834 private: 835 int sleep() const; 836 }; 837 838 839 class CompilerThread; 840 841 typedef void (*ThreadFunction)(JavaThread*, TRAPS); 842 843 class JavaThread: public Thread { 844 friend class VMStructs; 845 friend class JVMCIVMStructs; 846 friend class WhiteBox; 847 private: 848 JavaThread* _next; // The next thread in the Threads list 849 bool _on_thread_list; // Is set when this JavaThread is added to the Threads list 850 oop _threadObj; // The Java level thread object 851 852 #ifdef ASSERT 853 private: 854 int _java_call_counter; 855 856 public: 857 int java_call_counter() { return _java_call_counter; } 858 void inc_java_call_counter() { _java_call_counter++; } 859 void dec_java_call_counter() { 860 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); 861 _java_call_counter--; 862 } 863 private: // restore original namespace restriction 864 #endif // ifdef ASSERT 865 866 #ifndef PRODUCT 867 public: 868 enum { 869 jump_ring_buffer_size = 16 870 }; 871 private: // restore original namespace restriction 872 #endif 873 874 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state 875 876 ThreadFunction _entry_point; 877 878 JNIEnv _jni_environment; 879 880 // Deopt support 881 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization 882 883 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we 884 // transition out of native 885 CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized 886 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays 887 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped 888 // Because deoptimization is lazy we must save jvmti requests to set locals 889 // in compiled frames until we deoptimize and we have an interpreter frame. 890 // This holds the pointer to array (yeah like there might be more than one) of 891 // description of compiled vframes that have locals that need to be updated. 892 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; 893 894 // Handshake value for fixing 6243940. We need a place for the i2c 895 // adapter to store the callee Method*. This value is NEVER live 896 // across a gc point so it does NOT have to be gc'd 897 // The handshake is open ended since we can't be certain that it will 898 // be NULLed. This is because we rarely ever see the race and end up 899 // in handle_wrong_method which is the backend of the handshake. See 900 // code in i2c adapters and handle_wrong_method. 901 902 Method* _callee_target; 903 904 // Used to pass back results to the interpreter or generated code running Java code. 905 oop _vm_result; // oop result is GC-preserved 906 Metadata* _vm_result_2; // non-oop result 907 908 // See ReduceInitialCardMarks: this holds the precise space interval of 909 // the most recent slow path allocation for which compiled code has 910 // elided card-marks for performance along the fast-path. 911 MemRegion _deferred_card_mark; 912 913 MonitorChunk* _monitor_chunks; // Contains the off stack monitors 914 // allocated during deoptimization 915 // and by JNI_MonitorEnter/Exit 916 917 // Async. requests support 918 enum AsyncRequests { 919 _no_async_condition = 0, 920 _async_exception, 921 _async_unsafe_access_error 922 }; 923 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request 924 oop _pending_async_exception; 925 926 // Safepoint support 927 public: // Expose _thread_state for SafeFetchInt() 928 volatile JavaThreadState _thread_state; 929 private: 930 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint 931 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened 932 933 // JavaThread termination support 934 enum TerminatedTypes { 935 _not_terminated = 0xDEAD - 2, 936 _thread_exiting, // JavaThread::exit() has been called for this thread 937 _thread_terminated, // JavaThread is removed from thread list 938 _vm_exited // JavaThread is still executing native code, but VM is terminated 939 // only VM_Exit can set _vm_exited 940 }; 941 942 // In general a JavaThread's _terminated field transitions as follows: 943 // 944 // _not_terminated => _thread_exiting => _thread_terminated 945 // 946 // _vm_exited is a special value to cover the case of a JavaThread 947 // executing native code after the VM itself is terminated. 948 volatile TerminatedTypes _terminated; 949 // suspend/resume support 950 volatile bool _suspend_equivalent; // Suspend equivalent condition 951 jint _in_deopt_handler; // count of deoptimization 952 // handlers thread is in 953 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access 954 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was 955 // never locked) when throwing an exception. Used by interpreter only. 956 957 // JNI attach states: 958 enum JNIAttachStates { 959 _not_attaching_via_jni = 1, // thread is not attaching via JNI 960 _attaching_via_jni, // thread is attaching via JNI 961 _attached_via_jni // thread has attached via JNI 962 }; 963 964 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. 965 // A native thread that is attaching via JNI starts with a value 966 // of _attaching_via_jni and transitions to _attached_via_jni. 967 volatile JNIAttachStates _jni_attach_state; 968 969 public: 970 // State of the stack guard pages for this thread. 971 enum StackGuardState { 972 stack_guard_unused, // not needed 973 stack_guard_reserved_disabled, 974 stack_guard_yellow_reserved_disabled,// disabled (temporarily) after stack overflow 975 stack_guard_enabled // enabled 976 }; 977 978 private: 979 980 #if INCLUDE_JVMCI 981 // The _pending_* fields below are used to communicate extra information 982 // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. 983 984 // Communicates the DeoptReason and DeoptAction of the uncommon trap 985 int _pending_deoptimization; 986 987 // Specifies whether the uncommon trap is to bci 0 of a synchronized method 988 // before the monitor has been acquired. 989 bool _pending_monitorenter; 990 991 // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter 992 bool _pending_transfer_to_interpreter; 993 994 // Guard for re-entrant call to JVMCIRuntime::adjust_comp_level 995 bool _adjusting_comp_level; 996 997 // An object that JVMCI compiled code can use to further describe and 998 // uniquely identify the speculative optimization guarded by the uncommon trap 999 oop _pending_failed_speculation; 1000 1001 // These fields are mutually exclusive in terms of live ranges. 1002 union { 1003 // Communicates the pc at which the most recent implicit exception occurred 1004 // from the signal handler to a deoptimization stub. 1005 address _implicit_exception_pc; 1006 1007 // Communicates an alternative call target to an i2c stub from a JavaCall . 1008 address _alternate_call_target; 1009 } _jvmci; 1010 1011 // Support for high precision, thread sensitive counters in JVMCI compiled code. 1012 jlong* _jvmci_counters; 1013 1014 public: 1015 static jlong* _jvmci_old_thread_counters; 1016 static void collect_counters(typeArrayOop array); 1017 private: 1018 #endif // INCLUDE_JVMCI 1019 1020 StackGuardState _stack_guard_state; 1021 1022 // Precompute the limit of the stack as used in stack overflow checks. 1023 // We load it from here to simplify the stack overflow check in assembly. 1024 address _stack_overflow_limit; 1025 address _reserved_stack_activation; 1026 1027 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is 1028 // used to temp. parsing values into and out of the runtime system during exception handling for compiled 1029 // code) 1030 volatile oop _exception_oop; // Exception thrown in compiled code 1031 volatile address _exception_pc; // PC where exception happened 1032 volatile address _exception_handler_pc; // PC for handler of exception 1033 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. 1034 1035 private: 1036 // support for JNI critical regions 1037 jint _jni_active_critical; // count of entries into JNI critical region 1038 1039 // Checked JNI: function name requires exception check 1040 char* _pending_jni_exception_check_fn; 1041 1042 // For deadlock detection. 1043 int _depth_first_number; 1044 1045 // JVMTI PopFrame support 1046 // This is set to popframe_pending to signal that top Java frame should be popped immediately 1047 int _popframe_condition; 1048 1049 // If reallocation of scalar replaced objects fails, we throw OOM 1050 // and during exception propagation, pop the top 1051 // _frames_to_pop_failed_realloc frames, the ones that reference 1052 // failed reallocations. 1053 int _frames_to_pop_failed_realloc; 1054 1055 #ifndef PRODUCT 1056 int _jmp_ring_index; 1057 struct { 1058 // We use intptr_t instead of address so debugger doesn't try and display strings 1059 intptr_t _target; 1060 intptr_t _instruction; 1061 const char* _file; 1062 int _line; 1063 } _jmp_ring[jump_ring_buffer_size]; 1064 #endif // PRODUCT 1065 1066 #if INCLUDE_ALL_GCS 1067 // Support for G1 barriers 1068 1069 SATBMarkQueue _satb_mark_queue; // Thread-local log for SATB barrier. 1070 // Set of all such queues. 1071 static SATBMarkQueueSet _satb_mark_queue_set; 1072 1073 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. 1074 // Set of all such queues. 1075 static DirtyCardQueueSet _dirty_card_queue_set; 1076 1077 void flush_barrier_queues(); 1078 #endif // INCLUDE_ALL_GCS 1079 1080 friend class VMThread; 1081 friend class ThreadWaitTransition; 1082 friend class VM_Exit; 1083 1084 void initialize(); // Initialized the instance variables 1085 1086 public: 1087 // Constructor 1088 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads 1089 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); 1090 ~JavaThread(); 1091 1092 #ifdef ASSERT 1093 // verify this JavaThread hasn't be published in the Threads::list yet 1094 void verify_not_published(); 1095 #endif 1096 1097 //JNI functiontable getter/setter for JVMTI jni function table interception API. 1098 void set_jni_functions(struct JNINativeInterface_* functionTable) { 1099 _jni_environment.functions = functionTable; 1100 } 1101 struct JNINativeInterface_* get_jni_functions() { 1102 return (struct JNINativeInterface_ *)_jni_environment.functions; 1103 } 1104 1105 // This function is called at thread creation to allow 1106 // platform specific thread variables to be initialized. 1107 void cache_global_variables(); 1108 1109 // Executes Shutdown.shutdown() 1110 void invoke_shutdown_hooks(); 1111 1112 // Cleanup on thread exit 1113 enum ExitType { 1114 normal_exit, 1115 jni_detach 1116 }; 1117 void exit(bool destroy_vm, ExitType exit_type = normal_exit); 1118 1119 void cleanup_failed_attach_current_thread(); 1120 1121 // Testers 1122 virtual bool is_Java_thread() const { return true; } 1123 virtual bool can_call_java() const { return true; } 1124 1125 // Thread chain operations 1126 JavaThread* next() const { return _next; } 1127 void set_next(JavaThread* p) { _next = p; } 1128 1129 // Thread oop. threadObj() can be NULL for initial JavaThread 1130 // (or for threads attached via JNI) 1131 oop threadObj() const { return _threadObj; } 1132 void set_threadObj(oop p) { _threadObj = p; } 1133 1134 ThreadPriority java_priority() const; // Read from threadObj() 1135 1136 // Prepare thread and add to priority queue. If a priority is 1137 // not specified, use the priority of the thread object. Threads_lock 1138 // must be held while this function is called. 1139 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); 1140 void prepare_ext(); 1141 1142 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } 1143 address saved_exception_pc() { return _saved_exception_pc; } 1144 1145 1146 ThreadFunction entry_point() const { return _entry_point; } 1147 1148 // Allocates a new Java level thread object for this thread. thread_name may be NULL. 1149 void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPS); 1150 1151 // Last frame anchor routines 1152 1153 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } 1154 1155 // last_Java_sp 1156 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } 1157 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } 1158 1159 // last_Java_pc 1160 1161 address last_Java_pc(void) { return _anchor.last_Java_pc(); } 1162 1163 // Safepoint support 1164 #if !(defined(PPC64) || defined(AARCH64)) 1165 JavaThreadState thread_state() const { return _thread_state; } 1166 void set_thread_state(JavaThreadState s) { _thread_state = s; } 1167 #else 1168 // Use membars when accessing volatile _thread_state. See 1169 // Threads::create_vm() for size checks. 1170 inline JavaThreadState thread_state() const; 1171 inline void set_thread_state(JavaThreadState s); 1172 #endif 1173 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } 1174 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } 1175 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } 1176 1177 // JavaThread termination and lifecycle support: 1178 void smr_delete(); 1179 bool on_thread_list() { return _on_thread_list; } 1180 void set_on_thread_list() { _on_thread_list = true; } 1181 1182 // thread has called JavaThread::exit() or is terminated 1183 bool is_exiting() const; 1184 // thread is terminated (no longer on the threads list); we compare 1185 // against the two non-terminated values so that a freed JavaThread 1186 // will also be considered terminated. 1187 bool check_is_terminated(TerminatedTypes l_terminated) const { 1188 return l_terminated != _not_terminated && l_terminated != _thread_exiting; 1189 } 1190 bool is_terminated(); 1191 void set_terminated(TerminatedTypes t); 1192 // special for Threads::remove() which is static: 1193 void set_terminated_value(); 1194 void block_if_vm_exited(); 1195 1196 bool doing_unsafe_access() { return _doing_unsafe_access; } 1197 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } 1198 1199 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } 1200 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } 1201 1202 inline void set_polling_page(void* poll_value); 1203 inline volatile void* get_polling_page(); 1204 1205 private: 1206 // Support for thread handshake operations 1207 HandshakeState _handshake; 1208 public: 1209 void set_handshake_operation(HandshakeOperation* op) { 1210 _handshake.set_operation(this, op); 1211 } 1212 1213 bool has_handshake() const { 1214 return _handshake.has_operation(); 1215 } 1216 1217 void cancel_handshake() { 1218 _handshake.cancel(this); 1219 } 1220 1221 void handshake_process_by_self() { 1222 _handshake.process_by_self(this); 1223 } 1224 1225 void handshake_process_by_vmthread() { 1226 _handshake.process_by_vmthread(this); 1227 } 1228 1229 // Suspend/resume support for JavaThread 1230 private: 1231 inline void set_ext_suspended(); 1232 inline void clear_ext_suspended(); 1233 1234 public: 1235 void java_suspend(); 1236 void java_resume(); 1237 int java_suspend_self(); 1238 1239 void check_and_wait_while_suspended() { 1240 assert(JavaThread::current() == this, "sanity check"); 1241 1242 bool do_self_suspend; 1243 do { 1244 // were we externally suspended while we were waiting? 1245 do_self_suspend = handle_special_suspend_equivalent_condition(); 1246 if (do_self_suspend) { 1247 // don't surprise the thread that suspended us by returning 1248 java_suspend_self(); 1249 set_suspend_equivalent(); 1250 } 1251 } while (do_self_suspend); 1252 } 1253 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); 1254 // Check for async exception in addition to safepoint and suspend request. 1255 static void check_special_condition_for_native_trans(JavaThread *thread); 1256 1257 // Same as check_special_condition_for_native_trans but finishes the 1258 // transition into thread_in_Java mode so that it can potentially 1259 // block. 1260 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); 1261 1262 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); 1263 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { 1264 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1265 // Warning: is_ext_suspend_completed() may temporarily drop the 1266 // SR_lock to allow the thread to reach a stable thread state if 1267 // it is currently in a transient thread state. 1268 return is_ext_suspend_completed(false /* !called_by_wait */, 1269 SuspendRetryDelay, bits); 1270 } 1271 1272 // We cannot allow wait_for_ext_suspend_completion() to run forever or 1273 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally 1274 // passed as the count and delay parameters. Experiments with specific 1275 // calls to wait_for_ext_suspend_completion() can be done by passing 1276 // other values in the code. Experiments with all calls can be done 1277 // via the appropriate -XX options. 1278 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); 1279 1280 // test for suspend - most (all?) of these should go away 1281 bool is_thread_fully_suspended(bool wait_for_suspend, uint32_t *bits); 1282 1283 inline void set_external_suspend(); 1284 inline void clear_external_suspend(); 1285 1286 inline void set_deopt_suspend(); 1287 inline void clear_deopt_suspend(); 1288 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } 1289 1290 bool is_external_suspend() const { 1291 return (_suspend_flags & _external_suspend) != 0; 1292 } 1293 // Whenever a thread transitions from native to vm/java it must suspend 1294 // if external|deopt suspend is present. 1295 bool is_suspend_after_native() const { 1296 return (_suspend_flags & (_external_suspend | _deopt_suspend)) != 0; 1297 } 1298 1299 // external suspend request is completed 1300 bool is_ext_suspended() const { 1301 return (_suspend_flags & _ext_suspended) != 0; 1302 } 1303 1304 bool is_external_suspend_with_lock() const { 1305 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1306 return is_external_suspend(); 1307 } 1308 1309 // Special method to handle a pending external suspend request 1310 // when a suspend equivalent condition lifts. 1311 bool handle_special_suspend_equivalent_condition() { 1312 assert(is_suspend_equivalent(), 1313 "should only be called in a suspend equivalence condition"); 1314 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1315 bool ret = is_external_suspend(); 1316 if (!ret) { 1317 // not about to self-suspend so clear suspend equivalence 1318 clear_suspend_equivalent(); 1319 } 1320 // implied else: 1321 // We have a pending external suspend request so we leave the 1322 // suspend_equivalent flag set until java_suspend_self() sets 1323 // the ext_suspended flag and clears the suspend_equivalent 1324 // flag. This insures that wait_for_ext_suspend_completion() 1325 // will return consistent values. 1326 return ret; 1327 } 1328 1329 // utility methods to see if we are doing some kind of suspension 1330 bool is_being_ext_suspended() const { 1331 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); 1332 return is_ext_suspended() || is_external_suspend(); 1333 } 1334 1335 bool is_suspend_equivalent() const { return _suspend_equivalent; } 1336 1337 void set_suspend_equivalent() { _suspend_equivalent = true; } 1338 void clear_suspend_equivalent() { _suspend_equivalent = false; } 1339 1340 // Thread.stop support 1341 void send_thread_stop(oop throwable); 1342 AsyncRequests clear_special_runtime_exit_condition() { 1343 AsyncRequests x = _special_runtime_exit_condition; 1344 _special_runtime_exit_condition = _no_async_condition; 1345 return x; 1346 } 1347 1348 // Are any async conditions present? 1349 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } 1350 1351 void check_and_handle_async_exceptions(bool check_unsafe_error = true); 1352 1353 // these next two are also used for self-suspension and async exception support 1354 void handle_special_runtime_exit_condition(bool check_asyncs = true); 1355 1356 // Return true if JavaThread has an asynchronous condition or 1357 // if external suspension is requested. 1358 bool has_special_runtime_exit_condition() { 1359 // Because we don't use is_external_suspend_with_lock 1360 // it is possible that we won't see an asynchronous external suspend 1361 // request that has just gotten started, i.e., SR_lock grabbed but 1362 // _external_suspend field change either not made yet or not visible 1363 // yet. However, this is okay because the request is asynchronous and 1364 // we will see the new flag value the next time through. It's also 1365 // possible that the external suspend request is dropped after 1366 // we have checked is_external_suspend(), we will recheck its value 1367 // under SR_lock in java_suspend_self(). 1368 return (_special_runtime_exit_condition != _no_async_condition) || 1369 is_external_suspend() || is_trace_suspend(); 1370 } 1371 1372 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } 1373 1374 inline void set_pending_async_exception(oop e); 1375 1376 // Fast-locking support 1377 bool is_lock_owned(address adr) const; 1378 1379 // Accessors for vframe array top 1380 // The linked list of vframe arrays are sorted on sp. This means when we 1381 // unpack the head must contain the vframe array to unpack. 1382 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } 1383 vframeArray* vframe_array_head() const { return _vframe_array_head; } 1384 1385 // Side structure for deferring update of java frame locals until deopt occurs 1386 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } 1387 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } 1388 1389 // These only really exist to make debugging deopt problems simpler 1390 1391 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } 1392 vframeArray* vframe_array_last() const { return _vframe_array_last; } 1393 1394 // The special resourceMark used during deoptimization 1395 1396 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } 1397 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } 1398 1399 intptr_t* must_deopt_id() { return _must_deopt_id; } 1400 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } 1401 void clear_must_deopt_id() { _must_deopt_id = NULL; } 1402 1403 void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } 1404 CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } 1405 1406 Method* callee_target() const { return _callee_target; } 1407 void set_callee_target (Method* x) { _callee_target = x; } 1408 1409 // Oop results of vm runtime calls 1410 oop vm_result() const { return _vm_result; } 1411 void set_vm_result (oop x) { _vm_result = x; } 1412 1413 Metadata* vm_result_2() const { return _vm_result_2; } 1414 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } 1415 1416 MemRegion deferred_card_mark() const { return _deferred_card_mark; } 1417 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } 1418 1419 #if INCLUDE_JVMCI 1420 int pending_deoptimization() const { return _pending_deoptimization; } 1421 oop pending_failed_speculation() const { return _pending_failed_speculation; } 1422 bool adjusting_comp_level() const { return _adjusting_comp_level; } 1423 void set_adjusting_comp_level(bool b) { _adjusting_comp_level = b; } 1424 bool has_pending_monitorenter() const { return _pending_monitorenter; } 1425 void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } 1426 void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } 1427 void set_pending_failed_speculation(oop failed_speculation) { _pending_failed_speculation = failed_speculation; } 1428 void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } 1429 void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; } 1430 void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; } 1431 #endif // INCLUDE_JVMCI 1432 1433 // Exception handling for compiled methods 1434 oop exception_oop() const { return _exception_oop; } 1435 address exception_pc() const { return _exception_pc; } 1436 address exception_handler_pc() const { return _exception_handler_pc; } 1437 bool is_method_handle_return() const { return _is_method_handle_return == 1; } 1438 1439 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } 1440 void set_exception_pc(address a) { _exception_pc = a; } 1441 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } 1442 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } 1443 1444 void clear_exception_oop_and_pc() { 1445 set_exception_oop(NULL); 1446 set_exception_pc(NULL); 1447 } 1448 1449 // Stack overflow support 1450 // 1451 // (small addresses) 1452 // 1453 // -- <-- stack_end() --- 1454 // | | 1455 // | red pages | 1456 // | | 1457 // -- <-- stack_red_zone_base() | 1458 // | | 1459 // | guard 1460 // | yellow pages zone 1461 // | | 1462 // | | 1463 // -- <-- stack_yellow_zone_base() | 1464 // | | 1465 // | | 1466 // | reserved pages | 1467 // | | 1468 // -- <-- stack_reserved_zone_base() --- --- 1469 // /|\ shadow <-- stack_overflow_limit() (somewhere in here) 1470 // | zone 1471 // \|/ size 1472 // some untouched memory --- 1473 // 1474 // 1475 // -- 1476 // | 1477 // | shadow zone 1478 // | 1479 // -- 1480 // x frame n 1481 // -- 1482 // x frame n-1 1483 // x 1484 // -- 1485 // ... 1486 // 1487 // -- 1488 // x frame 0 1489 // -- <-- stack_base() 1490 // 1491 // (large addresses) 1492 // 1493 1494 private: 1495 // These values are derived from flags StackRedPages, StackYellowPages, 1496 // StackReservedPages and StackShadowPages. The zone size is determined 1497 // ergonomically if page_size > 4K. 1498 static size_t _stack_red_zone_size; 1499 static size_t _stack_yellow_zone_size; 1500 static size_t _stack_reserved_zone_size; 1501 static size_t _stack_shadow_zone_size; 1502 public: 1503 inline size_t stack_available(address cur_sp); 1504 1505 static size_t stack_red_zone_size() { 1506 assert(_stack_red_zone_size > 0, "Don't call this before the field is initialized."); 1507 return _stack_red_zone_size; 1508 } 1509 static void set_stack_red_zone_size(size_t s) { 1510 assert(is_aligned(s, os::vm_page_size()), 1511 "We can not protect if the red zone size is not page aligned."); 1512 assert(_stack_red_zone_size == 0, "This should be called only once."); 1513 _stack_red_zone_size = s; 1514 } 1515 address stack_red_zone_base() { 1516 return (address)(stack_end() + stack_red_zone_size()); 1517 } 1518 bool in_stack_red_zone(address a) { 1519 return a <= stack_red_zone_base() && a >= stack_end(); 1520 } 1521 1522 static size_t stack_yellow_zone_size() { 1523 assert(_stack_yellow_zone_size > 0, "Don't call this before the field is initialized."); 1524 return _stack_yellow_zone_size; 1525 } 1526 static void set_stack_yellow_zone_size(size_t s) { 1527 assert(is_aligned(s, os::vm_page_size()), 1528 "We can not protect if the yellow zone size is not page aligned."); 1529 assert(_stack_yellow_zone_size == 0, "This should be called only once."); 1530 _stack_yellow_zone_size = s; 1531 } 1532 1533 static size_t stack_reserved_zone_size() { 1534 // _stack_reserved_zone_size may be 0. This indicates the feature is off. 1535 return _stack_reserved_zone_size; 1536 } 1537 static void set_stack_reserved_zone_size(size_t s) { 1538 assert(is_aligned(s, os::vm_page_size()), 1539 "We can not protect if the reserved zone size is not page aligned."); 1540 assert(_stack_reserved_zone_size == 0, "This should be called only once."); 1541 _stack_reserved_zone_size = s; 1542 } 1543 address stack_reserved_zone_base() { 1544 return (address)(stack_end() + 1545 (stack_red_zone_size() + stack_yellow_zone_size() + stack_reserved_zone_size())); 1546 } 1547 bool in_stack_reserved_zone(address a) { 1548 return (a <= stack_reserved_zone_base()) && 1549 (a >= (address)((intptr_t)stack_reserved_zone_base() - stack_reserved_zone_size())); 1550 } 1551 1552 static size_t stack_yellow_reserved_zone_size() { 1553 return _stack_yellow_zone_size + _stack_reserved_zone_size; 1554 } 1555 bool in_stack_yellow_reserved_zone(address a) { 1556 return (a <= stack_reserved_zone_base()) && (a >= stack_red_zone_base()); 1557 } 1558 1559 // Size of red + yellow + reserved zones. 1560 static size_t stack_guard_zone_size() { 1561 return stack_red_zone_size() + stack_yellow_reserved_zone_size(); 1562 } 1563 1564 static size_t stack_shadow_zone_size() { 1565 assert(_stack_shadow_zone_size > 0, "Don't call this before the field is initialized."); 1566 return _stack_shadow_zone_size; 1567 } 1568 static void set_stack_shadow_zone_size(size_t s) { 1569 // The shadow area is not allocated or protected, so 1570 // it needs not be page aligned. 1571 // But the stack bang currently assumes that it is a 1572 // multiple of page size. This guarantees that the bang 1573 // loop touches all pages in the shadow zone. 1574 // This can be guaranteed differently, as well. E.g., if 1575 // the page size is a multiple of 4K, banging in 4K steps 1576 // suffices to touch all pages. (Some pages are banged 1577 // several times, though.) 1578 assert(is_aligned(s, os::vm_page_size()), 1579 "Stack bang assumes multiple of page size."); 1580 assert(_stack_shadow_zone_size == 0, "This should be called only once."); 1581 _stack_shadow_zone_size = s; 1582 } 1583 1584 void create_stack_guard_pages(); 1585 void remove_stack_guard_pages(); 1586 1587 void enable_stack_reserved_zone(); 1588 void disable_stack_reserved_zone(); 1589 void enable_stack_yellow_reserved_zone(); 1590 void disable_stack_yellow_reserved_zone(); 1591 void enable_stack_red_zone(); 1592 void disable_stack_red_zone(); 1593 1594 inline bool stack_guard_zone_unused(); 1595 inline bool stack_yellow_reserved_zone_disabled(); 1596 inline bool stack_reserved_zone_disabled(); 1597 inline bool stack_guards_enabled(); 1598 1599 address reserved_stack_activation() const { return _reserved_stack_activation; } 1600 void set_reserved_stack_activation(address addr) { 1601 assert(_reserved_stack_activation == stack_base() 1602 || _reserved_stack_activation == NULL 1603 || addr == stack_base(), "Must not be set twice"); 1604 _reserved_stack_activation = addr; 1605 } 1606 1607 // Attempt to reguard the stack after a stack overflow may have occurred. 1608 // Returns true if (a) guard pages are not needed on this thread, (b) the 1609 // pages are already guarded, or (c) the pages were successfully reguarded. 1610 // Returns false if there is not enough stack space to reguard the pages, in 1611 // which case the caller should unwind a frame and try again. The argument 1612 // should be the caller's (approximate) sp. 1613 bool reguard_stack(address cur_sp); 1614 // Similar to above but see if current stackpoint is out of the guard area 1615 // and reguard if possible. 1616 bool reguard_stack(void); 1617 1618 address stack_overflow_limit() { return _stack_overflow_limit; } 1619 void set_stack_overflow_limit() { 1620 _stack_overflow_limit = 1621 stack_end() + MAX2(JavaThread::stack_guard_zone_size(), JavaThread::stack_shadow_zone_size()); 1622 } 1623 1624 // Misc. accessors/mutators 1625 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } 1626 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } 1627 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } 1628 1629 #ifndef PRODUCT 1630 void record_jump(address target, address instr, const char* file, int line); 1631 #endif // PRODUCT 1632 1633 // For assembly stub generation 1634 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); } 1635 #ifndef PRODUCT 1636 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index); } 1637 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring); } 1638 #endif // PRODUCT 1639 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); } 1640 static ByteSize pending_jni_exception_check_fn_offset() { 1641 return byte_offset_of(JavaThread, _pending_jni_exception_check_fn); 1642 } 1643 static ByteSize last_Java_sp_offset() { 1644 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); 1645 } 1646 static ByteSize last_Java_pc_offset() { 1647 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); 1648 } 1649 static ByteSize frame_anchor_offset() { 1650 return byte_offset_of(JavaThread, _anchor); 1651 } 1652 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target); } 1653 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result); } 1654 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2); } 1655 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state); } 1656 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); } 1657 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); } 1658 #if INCLUDE_JVMCI 1659 static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); } 1660 static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); } 1661 static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation); } 1662 static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); } 1663 static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); } 1664 static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); } 1665 #endif // INCLUDE_JVMCI 1666 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop); } 1667 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc); } 1668 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } 1669 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } 1670 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } 1671 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state); } 1672 static ByteSize reserved_stack_activation_offset() { return byte_offset_of(JavaThread, _reserved_stack_activation); } 1673 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags); } 1674 1675 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } 1676 static ByteSize should_post_on_exceptions_flag_offset() { 1677 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); 1678 } 1679 1680 #if INCLUDE_ALL_GCS 1681 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } 1682 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } 1683 #endif // INCLUDE_ALL_GCS 1684 1685 // Returns the jni environment for this thread 1686 JNIEnv* jni_environment() { return &_jni_environment; } 1687 1688 static JavaThread* thread_from_jni_environment(JNIEnv* env) { 1689 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); 1690 // Only return NULL if thread is off the thread list; starting to 1691 // exit should not return NULL. 1692 if (thread_from_jni_env->is_terminated()) { 1693 thread_from_jni_env->block_if_vm_exited(); 1694 return NULL; 1695 } else { 1696 return thread_from_jni_env; 1697 } 1698 } 1699 1700 // JNI critical regions. These can nest. 1701 bool in_critical() { return _jni_active_critical > 0; } 1702 bool in_last_critical() { return _jni_active_critical == 1; } 1703 void enter_critical() { 1704 assert(Thread::current() == this || 1705 (Thread::current()->is_VM_thread() && 1706 SafepointSynchronize::is_synchronizing()), 1707 "this must be current thread or synchronizing"); 1708 _jni_active_critical++; 1709 } 1710 void exit_critical() { 1711 assert(Thread::current() == this, "this must be current thread"); 1712 _jni_active_critical--; 1713 assert(_jni_active_critical >= 0, "JNI critical nesting problem?"); 1714 } 1715 1716 // Checked JNI: is the programmer required to check for exceptions, if so specify 1717 // which function name. Returning to a Java frame should implicitly clear the 1718 // pending check, this is done for Native->Java transitions (i.e. user JNI code). 1719 // VM->Java transistions are not cleared, it is expected that JNI code enclosed 1720 // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). 1721 bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; } 1722 void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; } 1723 const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } 1724 void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } 1725 1726 // For deadlock detection 1727 int depth_first_number() { return _depth_first_number; } 1728 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } 1729 1730 private: 1731 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } 1732 1733 public: 1734 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } 1735 void add_monitor_chunk(MonitorChunk* chunk); 1736 void remove_monitor_chunk(MonitorChunk* chunk); 1737 bool in_deopt_handler() const { return _in_deopt_handler > 0; } 1738 void inc_in_deopt_handler() { _in_deopt_handler++; } 1739 void dec_in_deopt_handler() { 1740 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); 1741 if (_in_deopt_handler > 0) { // robustness 1742 _in_deopt_handler--; 1743 } 1744 } 1745 1746 private: 1747 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } 1748 1749 public: 1750 1751 // Frame iteration; calls the function f for all frames on the stack 1752 void frames_do(void f(frame*, const RegisterMap*)); 1753 1754 // Memory operations 1755 void oops_do(OopClosure* f, CodeBlobClosure* cf); 1756 1757 // Sweeper operations 1758 virtual void nmethods_do(CodeBlobClosure* cf); 1759 1760 // RedefineClasses Support 1761 void metadata_do(void f(Metadata*)); 1762 1763 // Misc. operations 1764 char* name() const { return (char*)get_thread_name(); } 1765 void print_on(outputStream* st) const; 1766 void print_value(); 1767 void print_thread_state_on(outputStream*) const PRODUCT_RETURN; 1768 void print_thread_state() const PRODUCT_RETURN; 1769 void print_on_error(outputStream* st, char* buf, int buflen) const; 1770 void print_name_on_error(outputStream* st, char* buf, int buflen) const; 1771 void verify(); 1772 const char* get_thread_name() const; 1773 private: 1774 // factor out low-level mechanics for use in both normal and error cases 1775 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; 1776 public: 1777 const char* get_threadgroup_name() const; 1778 const char* get_parent_name() const; 1779 1780 // Accessing frames 1781 frame last_frame() { 1782 _anchor.make_walkable(this); 1783 return pd_last_frame(); 1784 } 1785 javaVFrame* last_java_vframe(RegisterMap* reg_map); 1786 1787 // Returns method at 'depth' java or native frames down the stack 1788 // Used for security checks 1789 Klass* security_get_caller_class(int depth); 1790 1791 // Print stack trace in external format 1792 void print_stack_on(outputStream* st); 1793 void print_stack() { print_stack_on(tty); } 1794 1795 // Print stack traces in various internal formats 1796 void trace_stack() PRODUCT_RETURN; 1797 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; 1798 void trace_frames() PRODUCT_RETURN; 1799 void trace_oops() PRODUCT_RETURN; 1800 1801 // Print an annotated view of the stack frames 1802 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; 1803 void validate_frame_layout() { 1804 print_frame_layout(0, true); 1805 } 1806 1807 // Returns the number of stack frames on the stack 1808 int depth() const; 1809 1810 // Function for testing deoptimization 1811 void deoptimize(); 1812 void make_zombies(); 1813 1814 void deoptimized_wrt_marked_nmethods(); 1815 1816 public: 1817 // Returns the running thread as a JavaThread 1818 static inline JavaThread* current(); 1819 1820 // Returns the active Java thread. Do not use this if you know you are calling 1821 // from a JavaThread, as it's slower than JavaThread::current. If called from 1822 // the VMThread, it also returns the JavaThread that instigated the VMThread's 1823 // operation. You may not want that either. 1824 static JavaThread* active(); 1825 1826 inline CompilerThread* as_CompilerThread(); 1827 1828 public: 1829 virtual void run(); 1830 void thread_main_inner(); 1831 1832 private: 1833 // PRIVILEGED STACK 1834 PrivilegedElement* _privileged_stack_top; 1835 GrowableArray<oop>* _array_for_gc; 1836 public: 1837 1838 // Returns the privileged_stack information. 1839 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } 1840 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } 1841 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } 1842 1843 public: 1844 // Thread local information maintained by JVMTI. 1845 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } 1846 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() 1847 // getter is used to get this JavaThread's JvmtiThreadState if it has 1848 // one which means NULL can be returned. JvmtiThreadState::state_for() 1849 // is used to get the specified JavaThread's JvmtiThreadState if it has 1850 // one or it allocates a new JvmtiThreadState for the JavaThread and 1851 // returns it. JvmtiThreadState::state_for() will return NULL only if 1852 // the specified JavaThread is exiting. 1853 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } 1854 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } 1855 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } 1856 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } 1857 1858 // JVMTI PopFrame support 1859 // Setting and clearing popframe_condition 1860 // All of these enumerated values are bits. popframe_pending 1861 // indicates that a PopFrame() has been requested and not yet been 1862 // completed. popframe_processing indicates that that PopFrame() is in 1863 // the process of being completed. popframe_force_deopt_reexecution_bit 1864 // indicates that special handling is required when returning to a 1865 // deoptimized caller. 1866 enum PopCondition { 1867 popframe_inactive = 0x00, 1868 popframe_pending_bit = 0x01, 1869 popframe_processing_bit = 0x02, 1870 popframe_force_deopt_reexecution_bit = 0x04 1871 }; 1872 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } 1873 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } 1874 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } 1875 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } 1876 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } 1877 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } 1878 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } 1879 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } 1880 #ifdef CC_INTERP 1881 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } 1882 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } 1883 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } 1884 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } 1885 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } 1886 #endif 1887 1888 int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } 1889 void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } 1890 void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } 1891 1892 private: 1893 // Saved incoming arguments to popped frame. 1894 // Used only when popped interpreted frame returns to deoptimized frame. 1895 void* _popframe_preserved_args; 1896 int _popframe_preserved_args_size; 1897 1898 public: 1899 void popframe_preserve_args(ByteSize size_in_bytes, void* start); 1900 void* popframe_preserved_args(); 1901 ByteSize popframe_preserved_args_size(); 1902 WordSize popframe_preserved_args_size_in_words(); 1903 void popframe_free_preserved_args(); 1904 1905 1906 private: 1907 JvmtiThreadState *_jvmti_thread_state; 1908 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; 1909 1910 // Used by the interpreter in fullspeed mode for frame pop, method 1911 // entry, method exit and single stepping support. This field is 1912 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. 1913 // It can be set to zero asynchronously (i.e., without a VM operation 1914 // or a lock) so we have to be very careful. 1915 int _interp_only_mode; 1916 1917 public: 1918 // used by the interpreter for fullspeed debugging support (see above) 1919 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } 1920 bool is_interp_only_mode() { return (_interp_only_mode != 0); } 1921 int get_interp_only_mode() { return _interp_only_mode; } 1922 void increment_interp_only_mode() { ++_interp_only_mode; } 1923 void decrement_interp_only_mode() { --_interp_only_mode; } 1924 1925 // support for cached flag that indicates whether exceptions need to be posted for this thread 1926 // if this is false, we can avoid deoptimizing when events are thrown 1927 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything 1928 private: 1929 int _should_post_on_exceptions_flag; 1930 1931 public: 1932 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } 1933 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } 1934 1935 private: 1936 ThreadStatistics *_thread_stat; 1937 1938 public: 1939 ThreadStatistics* get_thread_stat() const { return _thread_stat; } 1940 1941 // Return a blocker object for which this thread is blocked parking. 1942 oop current_park_blocker(); 1943 1944 private: 1945 static size_t _stack_size_at_create; 1946 1947 public: 1948 static inline size_t stack_size_at_create(void) { 1949 return _stack_size_at_create; 1950 } 1951 static inline void set_stack_size_at_create(size_t value) { 1952 _stack_size_at_create = value; 1953 } 1954 1955 #if INCLUDE_ALL_GCS 1956 // SATB marking queue support 1957 SATBMarkQueue& satb_mark_queue() { return _satb_mark_queue; } 1958 static SATBMarkQueueSet& satb_mark_queue_set() { 1959 return _satb_mark_queue_set; 1960 } 1961 1962 // Dirty card queue support 1963 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } 1964 static DirtyCardQueueSet& dirty_card_queue_set() { 1965 return _dirty_card_queue_set; 1966 } 1967 #endif // INCLUDE_ALL_GCS 1968 1969 // This method initializes the SATB and dirty card queues before a 1970 // JavaThread is added to the Java thread list. Right now, we don't 1971 // have to do anything to the dirty card queue (it should have been 1972 // activated when the thread was created), but we have to activate 1973 // the SATB queue if the thread is created while a marking cycle is 1974 // in progress. The activation / de-activation of the SATB queues at 1975 // the beginning / end of a marking cycle is done during safepoints 1976 // so we have to make sure this method is called outside one to be 1977 // able to safely read the active field of the SATB queue set. Right 1978 // now, it is called just before the thread is added to the Java 1979 // thread list in the Threads::add() method. That method is holding 1980 // the Threads_lock which ensures we are outside a safepoint. We 1981 // cannot do the obvious and set the active field of the SATB queue 1982 // when the thread is created given that, in some cases, safepoints 1983 // might happen between the JavaThread constructor being called and the 1984 // thread being added to the Java thread list (an example of this is 1985 // when the structure for the DestroyJavaVM thread is created). 1986 #if INCLUDE_ALL_GCS 1987 void initialize_queues(); 1988 #else // INCLUDE_ALL_GCS 1989 void initialize_queues() { } 1990 #endif // INCLUDE_ALL_GCS 1991 1992 // Machine dependent stuff 1993 #include OS_CPU_HEADER(thread) 1994 1995 public: 1996 void set_blocked_on_compilation(bool value) { 1997 _blocked_on_compilation = value; 1998 } 1999 2000 bool blocked_on_compilation() { 2001 return _blocked_on_compilation; 2002 } 2003 protected: 2004 bool _blocked_on_compilation; 2005 2006 2007 // JSR166 per-thread parker 2008 private: 2009 Parker* _parker; 2010 public: 2011 Parker* parker() { return _parker; } 2012 2013 // Biased locking support 2014 private: 2015 GrowableArray<MonitorInfo*>* _cached_monitor_info; 2016 public: 2017 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } 2018 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } 2019 2020 // clearing/querying jni attach status 2021 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } 2022 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } 2023 inline void set_done_attaching_via_jni(); 2024 }; 2025 2026 // Inline implementation of JavaThread::current 2027 inline JavaThread* JavaThread::current() { 2028 Thread* thread = Thread::current(); 2029 assert(thread->is_Java_thread(), "just checking"); 2030 return (JavaThread*)thread; 2031 } 2032 2033 inline CompilerThread* JavaThread::as_CompilerThread() { 2034 assert(is_Compiler_thread(), "just checking"); 2035 return (CompilerThread*)this; 2036 } 2037 2038 // Dedicated thread to sweep the code cache 2039 class CodeCacheSweeperThread : public JavaThread { 2040 CompiledMethod* _scanned_compiled_method; // nmethod being scanned by the sweeper 2041 public: 2042 CodeCacheSweeperThread(); 2043 // Track the nmethod currently being scanned by the sweeper 2044 void set_scanned_compiled_method(CompiledMethod* cm) { 2045 assert(_scanned_compiled_method == NULL || cm == NULL, "should reset to NULL before writing a new value"); 2046 _scanned_compiled_method = cm; 2047 } 2048 2049 // Hide sweeper thread from external view. 2050 bool is_hidden_from_external_view() const { return true; } 2051 2052 bool is_Code_cache_sweeper_thread() const { return true; } 2053 2054 // Prevent GC from unloading _scanned_compiled_method 2055 void oops_do(OopClosure* f, CodeBlobClosure* cf); 2056 void nmethods_do(CodeBlobClosure* cf); 2057 }; 2058 2059 // A thread used for Compilation. 2060 class CompilerThread : public JavaThread { 2061 friend class VMStructs; 2062 private: 2063 CompilerCounters* _counters; 2064 2065 ciEnv* _env; 2066 CompileLog* _log; 2067 CompileTask* _task; 2068 CompileQueue* _queue; 2069 BufferBlob* _buffer_blob; 2070 2071 AbstractCompiler* _compiler; 2072 2073 public: 2074 2075 static CompilerThread* current(); 2076 2077 CompilerThread(CompileQueue* queue, CompilerCounters* counters); 2078 2079 bool is_Compiler_thread() const { return true; } 2080 2081 virtual bool can_call_java() const; 2082 2083 // Hide native compiler threads from external view. 2084 bool is_hidden_from_external_view() const { return !can_call_java(); } 2085 2086 void set_compiler(AbstractCompiler* c) { _compiler = c; } 2087 AbstractCompiler* compiler() const { return _compiler; } 2088 2089 CompileQueue* queue() const { return _queue; } 2090 CompilerCounters* counters() const { return _counters; } 2091 2092 // Get/set the thread's compilation environment. 2093 ciEnv* env() { return _env; } 2094 void set_env(ciEnv* env) { _env = env; } 2095 2096 BufferBlob* get_buffer_blob() const { return _buffer_blob; } 2097 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; } 2098 2099 // Get/set the thread's logging information 2100 CompileLog* log() { return _log; } 2101 void init_log(CompileLog* log) { 2102 // Set once, for good. 2103 assert(_log == NULL, "set only once"); 2104 _log = log; 2105 } 2106 2107 #ifndef PRODUCT 2108 private: 2109 IdealGraphPrinter *_ideal_graph_printer; 2110 public: 2111 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } 2112 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } 2113 #endif 2114 2115 // Get/set the thread's current task 2116 CompileTask* task() { return _task; } 2117 void set_task(CompileTask* task) { _task = task; } 2118 }; 2119 2120 inline CompilerThread* CompilerThread::current() { 2121 return JavaThread::current()->as_CompilerThread(); 2122 } 2123 2124 // The active thread queue. It also keeps track of the current used 2125 // thread priorities. 2126 class Threads: AllStatic { 2127 friend class VMStructs; 2128 private: 2129 // Safe Memory Reclamation (SMR) support: 2130 static Monitor* _smr_delete_lock; 2131 // The '_cnt', '_max' and '_times" fields are enabled via 2132 // -XX:+EnableThreadSMRStatistics: 2133 static uint _smr_delete_lock_wait_cnt; 2134 static uint _smr_delete_lock_wait_max; 2135 static volatile jint _smr_delete_notify; 2136 static volatile jint _smr_deleted_thread_cnt; 2137 static volatile jint _smr_deleted_thread_time_max; 2138 static volatile jint _smr_deleted_thread_times; 2139 static ThreadsList* volatile _smr_java_thread_list; 2140 static ThreadsList* get_smr_java_thread_list(); 2141 static ThreadsList* xchg_smr_java_thread_list(ThreadsList* new_list); 2142 static long _smr_java_thread_list_alloc_cnt; 2143 static long _smr_java_thread_list_free_cnt; 2144 static uint _smr_java_thread_list_max; 2145 static uint _smr_nested_thread_list_max; 2146 static volatile jint _smr_tlh_cnt; 2147 static volatile jint _smr_tlh_time_max; 2148 static volatile jint _smr_tlh_times; 2149 static ThreadsList* _smr_to_delete_list; 2150 static uint _smr_to_delete_list_cnt; 2151 static uint _smr_to_delete_list_max; 2152 2153 static JavaThread* _thread_list; 2154 static int _number_of_threads; 2155 static int _number_of_non_daemon_threads; 2156 static int _return_code; 2157 static int _thread_claim_parity; 2158 #ifdef ASSERT 2159 static bool _vm_complete; 2160 #endif 2161 2162 static void initialize_java_lang_classes(JavaThread* main_thread, TRAPS); 2163 static void initialize_jsr292_core_classes(TRAPS); 2164 2165 static void smr_free_list(ThreadsList* threads); 2166 2167 public: 2168 // Thread management 2169 // force_daemon is a concession to JNI, where we may need to add a 2170 // thread to the thread list before allocating its thread object 2171 static void add(JavaThread* p, bool force_daemon = false); 2172 static void remove(JavaThread* p); 2173 static void threads_do(ThreadClosure* tc); 2174 static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); 2175 2176 // SMR support: 2177 template <class T> 2178 static void threads_do_smr(T *tc, Thread *self); 2179 static ThreadsList *acquire_stable_list(Thread *self, bool is_ThreadsListSetter); 2180 static ThreadsList *acquire_stable_list_fast_path(Thread *self); 2181 static ThreadsList *acquire_stable_list_nested_path(Thread *self); 2182 static void release_stable_list(Thread *self); 2183 static void release_stable_list_fast_path(Thread *self); 2184 static void release_stable_list_nested_path(Thread *self); 2185 static void release_stable_list_wake_up(char *log_str); 2186 static bool is_a_protected_JavaThread(JavaThread *thread); 2187 static bool is_a_protected_JavaThread_with_lock(JavaThread *thread) { 2188 MutexLockerEx ml(Threads_lock->owned_by_self() ? NULL : Threads_lock); 2189 return is_a_protected_JavaThread(thread); 2190 } 2191 static void smr_delete(JavaThread *thread); 2192 // The coordination between Threads::release_stable_list() and 2193 // Threads::smr_delete() uses the smr_delete_lock in order to 2194 // reduce the traffic on the Threads_lock. 2195 static Monitor* smr_delete_lock() { return _smr_delete_lock; } 2196 // The smr_delete_notify flag is used for proper double-check 2197 // locking in order to reduce the traffic on the smr_delete_lock. 2198 static bool smr_delete_notify(); 2199 static void set_smr_delete_notify(); 2200 static void clear_smr_delete_notify(); 2201 static void inc_smr_deleted_thread_cnt(); 2202 static void update_smr_deleted_thread_time_max(jint new_value); 2203 static void add_smr_deleted_thread_times(jint add_value); 2204 static void inc_smr_tlh_cnt(); 2205 static void update_smr_tlh_time_max(jint new_value); 2206 static void add_smr_tlh_times(jint add_value); 2207 2208 // Initializes the vm and creates the vm thread 2209 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); 2210 static void convert_vm_init_libraries_to_agents(); 2211 static void create_vm_init_libraries(); 2212 static void create_vm_init_agents(); 2213 static void shutdown_vm_agents(); 2214 static bool destroy_vm(); 2215 // Supported VM versions via JNI 2216 // Includes JNI_VERSION_1_1 2217 static jboolean is_supported_jni_version_including_1_1(jint version); 2218 // Does not include JNI_VERSION_1_1 2219 static jboolean is_supported_jni_version(jint version); 2220 2221 // The "thread claim parity" provides a way for threads to be claimed 2222 // by parallel worker tasks. 2223 // 2224 // Each thread contains a a "parity" field. A task will claim the 2225 // thread only if its parity field is the same as the global parity, 2226 // which is updated by calling change_thread_claim_parity(). 2227 // 2228 // For this to work change_thread_claim_parity() needs to be called 2229 // exactly once in sequential code before starting parallel tasks 2230 // that should claim threads. 2231 // 2232 // New threads get their parity set to 0 and change_thread_claim_parity() 2233 // never set the global parity to 0. 2234 static int thread_claim_parity() { return _thread_claim_parity; } 2235 static void change_thread_claim_parity(); 2236 static void assert_all_threads_claimed() NOT_DEBUG_RETURN; 2237 2238 // Apply "f->do_oop" to all root oops in all threads. 2239 // This version may only be called by sequential code. 2240 static void oops_do(OopClosure* f, CodeBlobClosure* cf); 2241 // This version may be called by sequential or parallel code. 2242 static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); 2243 // This creates a list of GCTasks, one per thread. 2244 static void create_thread_roots_tasks(GCTaskQueue* q); 2245 // This creates a list of GCTasks, one per thread, for marking objects. 2246 static void create_thread_roots_marking_tasks(GCTaskQueue* q); 2247 2248 // Apply "f->do_oop" to roots in all threads that 2249 // are part of compiled frames 2250 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); 2251 2252 static void convert_hcode_pointers(); 2253 static void restore_hcode_pointers(); 2254 2255 // Sweeper 2256 static void nmethods_do(CodeBlobClosure* cf); 2257 2258 // RedefineClasses support 2259 static void metadata_do(void f(Metadata*)); 2260 static void metadata_handles_do(void f(Metadata*)); 2261 2262 #ifdef ASSERT 2263 static bool is_vm_complete() { return _vm_complete; } 2264 #endif 2265 2266 // Verification 2267 static void verify(); 2268 static void log_smr_statistics(); 2269 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); 2270 static void print_smr_info_on(outputStream* st); 2271 static void print_smr_info_elements_on(outputStream* st, ThreadsList* t_list); 2272 static void print(bool print_stacks, bool internal_format) { 2273 // this function is only used by debug.cpp 2274 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); 2275 } 2276 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); 2277 static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 2278 int buflen, bool* found_current); 2279 static void print_threads_compiling(outputStream* st, char* buf, int buflen); 2280 2281 // Get Java threads that are waiting to enter a monitor. 2282 static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, 2283 int count, address monitor); 2284 2285 // Get owning Java thread from the monitor's owner field. 2286 static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, 2287 address owner); 2288 2289 // Number of threads on the active threads list 2290 static int number_of_threads() { return _number_of_threads; } 2291 // Number of non-daemon threads on the active threads list 2292 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } 2293 2294 // Deoptimizes all frames tied to marked nmethods 2295 static void deoptimized_wrt_marked_nmethods(); 2296 }; 2297 2298 2299 // Thread iterator 2300 class ThreadClosure: public StackObj { 2301 public: 2302 virtual void do_thread(Thread* thread) = 0; 2303 }; 2304 2305 class SignalHandlerMark: public StackObj { 2306 private: 2307 Thread* _thread; 2308 public: 2309 SignalHandlerMark(Thread* t) { 2310 _thread = t; 2311 if (_thread) _thread->enter_signal_handler(); 2312 } 2313 ~SignalHandlerMark() { 2314 if (_thread) _thread->leave_signal_handler(); 2315 _thread = NULL; 2316 } 2317 }; 2318 2319 2320 #endif // SHARE_VM_RUNTIME_THREAD_HPP