1 /*
2 * Copyright (c) 1997, 2010, 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 "memory/allocation.hpp"
29 #include "memory/threadLocalAllocBuffer.hpp"
30 #include "oops/oop.hpp"
31 #include "prims/jni.h"
32 #include "prims/jvmtiExport.hpp"
33 #include "runtime/frame.hpp"
34 #include "runtime/javaFrameAnchor.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/mutexLocker.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/osThread.hpp"
39 #include "runtime/park.hpp"
40 #include "runtime/safepoint.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "runtime/threadLocalStorage.hpp"
43 #include "runtime/unhandledOops.hpp"
44 #include "utilities/exceptions.hpp"
45 #include "utilities/top.hpp"
46 #ifndef SERIALGC
47 #include "gc_implementation/g1/dirtyCardQueue.hpp"
48 #include "gc_implementation/g1/satbQueue.hpp"
49 #endif
50 #ifdef ZERO
51 #ifdef TARGET_ARCH_zero
52 # include "stack_zero.hpp"
53 #endif
54 #endif
55
56 class ThreadSafepointState;
57 class ThreadProfiler;
58
59 class JvmtiThreadState;
60 class JvmtiGetLoadedClassesClosure;
61 class ThreadStatistics;
62 class ConcurrentLocksDump;
63 class ParkEvent ;
64 class Parker;
65
66 class ciEnv;
67 class CompileThread;
68 class CompileLog;
69 class CompileTask;
70 class CompileQueue;
71 class CompilerCounters;
72 class vframeArray;
73
74 class DeoptResourceMark;
75 class jvmtiDeferredLocalVariableSet;
76
77 class GCTaskQueue;
78 class ThreadClosure;
79 class IdealGraphPrinter;
80
81 // Class hierarchy
82 // - Thread
83 // - NamedThread
84 // - VMThread
85 // - ConcurrentGCThread
86 // - WorkerThread
87 // - GangWorker
88 // - GCTaskThread
89 // - JavaThread
90 // - WatcherThread
91
92 class Thread: public ThreadShadow {
93 friend class VMStructs;
94 private:
95 // Exception handling
96 // (Note: _pending_exception and friends are in ThreadShadow)
97 //oop _pending_exception; // pending exception for current thread
98 // const char* _exception_file; // file information for exception (debugging only)
99 // int _exception_line; // line information for exception (debugging only)
100
101 // Support for forcing alignment of thread objects for biased locking
102 void* _real_malloc_address;
103 public:
104 void* operator new(size_t size);
105 void operator delete(void* p);
106 private:
107
108 // ***************************************************************
109 // Suspend and resume support
110 // ***************************************************************
111 //
112 // VM suspend/resume no longer exists - it was once used for various
113 // things including safepoints but was deprecated and finally removed
114 // in Java 7. Because VM suspension was considered "internal" Java-level
115 // suspension was considered "external", and this legacy naming scheme
116 // remains.
117 //
118 // External suspend/resume requests come from JVM_SuspendThread,
119 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
120 // ResumeThread. External
121 // suspend requests cause _external_suspend to be set and external
122 // resume requests cause _external_suspend to be cleared.
123 // External suspend requests do not nest on top of other external
124 // suspend requests. The higher level APIs reject suspend requests
125 // for already suspended threads.
126 //
127 // The external_suspend
128 // flag is checked by has_special_runtime_exit_condition() and java thread
129 // will self-suspend when handle_special_runtime_exit_condition() is
130 // called. Most uses of the _thread_blocked state in JavaThreads are
131 // considered the same as being externally suspended; if the blocking
132 // condition lifts, the JavaThread will self-suspend. Other places
133 // where VM checks for external_suspend include:
134 // + mutex granting (do not enter monitors when thread is suspended)
135 // + state transitions from _thread_in_native
136 //
137 // In general, java_suspend() does not wait for an external suspend
138 // request to complete. When it returns, the only guarantee is that
139 // the _external_suspend field is true.
140 //
141 // wait_for_ext_suspend_completion() is used to wait for an external
142 // suspend request to complete. External suspend requests are usually
143 // followed by some other interface call that requires the thread to
144 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
145 // the interface that requires quiescence, we give the JavaThread a
146 // chance to self-suspend before we need it to be quiescent. This
147 // improves overall suspend/query performance.
148 //
149 // _suspend_flags controls the behavior of java_ suspend/resume.
150 // It must be set under the protection of SR_lock. Read from the flag is
151 // OK without SR_lock as long as the value is only used as a hint.
152 // (e.g., check _external_suspend first without lock and then recheck
153 // inside SR_lock and finish the suspension)
154 //
155 // _suspend_flags is also overloaded for other "special conditions" so
156 // that a single check indicates whether any special action is needed
157 // eg. for async exceptions.
158 // -------------------------------------------------------------------
159 // Notes:
160 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
161 // but we still update its value to keep other part of the system (mainly
162 // JVMTI) happy. ThreadState is legacy code (see notes in
163 // osThread.hpp).
164 //
165 // 2. It would be more natural if set_external_suspend() is private and
166 // part of java_suspend(), but that probably would affect the suspend/query
167 // performance. Need more investigation on this.
168 //
169
170 // suspend/resume lock: used for self-suspend
171 Monitor* _SR_lock;
172
173 protected:
174 enum SuspendFlags {
175 // NOTE: avoid using the sign-bit as cc generates different test code
176 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
177
178 _external_suspend = 0x20000000U, // thread is asked to self suspend
179 _ext_suspended = 0x40000000U, // thread has self-suspended
180 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
181
182 _has_async_exception = 0x00000001U // there is a pending async exception
183 };
184
185 // various suspension related flags - atomically updated
186 // overloaded for async exception checking in check_special_condition_for_native_trans.
187 volatile uint32_t _suspend_flags;
188
189 private:
190 int _num_nested_signal;
191
192 public:
193 void enter_signal_handler() { _num_nested_signal++; }
194 void leave_signal_handler() { _num_nested_signal--; }
195 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
196
197 private:
198 // Debug tracing
199 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
200
201 // Active_handles points to a block of handles
202 JNIHandleBlock* _active_handles;
203
204 // One-element thread local free list
205 JNIHandleBlock* _free_handle_block;
206
207 // Point to the last handle mark
208 HandleMark* _last_handle_mark;
209
210 // The parity of the last strong_roots iteration in which this thread was
211 // claimed as a task.
212 jint _oops_do_parity;
213
214 public:
215 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
216 HandleMark* last_handle_mark() const { return _last_handle_mark; }
217 private:
218
219 // debug support for checking if code does allow safepoints or not
220 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
221 // mutex, or blocking on an object synchronizer (Java locking).
222 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
223 // If !allow_allocation(), then an assertion failure will happen during allocation
224 // (Hence, !allow_safepoint() => !allow_allocation()).
225 //
226 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
227 //
228 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
229 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
230
231 // Used by SkipGCALot class.
232 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
233
234 // Record when GC is locked out via the GC_locker mechanism
235 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
236
237 friend class No_Alloc_Verifier;
238 friend class No_Safepoint_Verifier;
239 friend class Pause_No_Safepoint_Verifier;
240 friend class ThreadLocalStorage;
241 friend class GC_locker;
242
243 ThreadLocalAllocBuffer _tlab; // Thread-local eden
244
245 int _vm_operation_started_count; // VM_Operation support
246 int _vm_operation_completed_count; // VM_Operation support
247
248 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
249 // is waiting to lock
250 bool _current_pending_monitor_is_from_java; // locking is from Java code
251
252 // ObjectMonitor on which this thread called Object.wait()
253 ObjectMonitor* _current_waiting_monitor;
254
255 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
256 public:
257 ObjectMonitor * omFreeList ;
258 int omFreeCount ; // length of omFreeList
259 int omFreeProvision ; // reload chunk size
260 ObjectMonitor * omInUseList; // SLL to track monitors in circulation
261 int omInUseCount; // length of omInUseList
262
263 public:
264 enum {
265 is_definitely_current_thread = true
266 };
267
268 // Constructor
269 Thread();
270 virtual ~Thread();
271
272 // initializtion
273 void initialize_thread_local_storage();
274
275 // thread entry point
276 virtual void run();
277
278 // Testers
279 virtual bool is_VM_thread() const { return false; }
280 virtual bool is_Java_thread() const { return false; }
281 // Remove this ifdef when C1 is ported to the compiler interface.
282 virtual bool is_Compiler_thread() const { return false; }
283 virtual bool is_hidden_from_external_view() const { return false; }
284 virtual bool is_jvmti_agent_thread() const { return false; }
285 // True iff the thread can perform GC operations at a safepoint.
286 // Generally will be true only of VM thread and parallel GC WorkGang
287 // threads.
288 virtual bool is_GC_task_thread() const { return false; }
289 virtual bool is_Watcher_thread() const { return false; }
290 virtual bool is_ConcurrentGC_thread() const { return false; }
291 virtual bool is_Named_thread() const { return false; }
292
293 virtual char* name() const { return (char*)"Unknown thread"; }
294
295 // Returns the current thread
296 static inline Thread* current();
297
298 // Common thread operations
299 static void set_priority(Thread* thread, ThreadPriority priority);
300 static ThreadPriority get_priority(const Thread* const thread);
301 static void start(Thread* thread);
302 static void interrupt(Thread* thr);
303 static bool is_interrupted(Thread* thr, bool clear_interrupted);
304
305 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
306 Monitor* SR_lock() const { return _SR_lock; }
307
308 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
309
310 void set_suspend_flag(SuspendFlags f) {
311 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
312 uint32_t flags;
313 do {
314 flags = _suspend_flags;
315 }
316 while (Atomic::cmpxchg((jint)(flags | f),
317 (volatile jint*)&_suspend_flags,
318 (jint)flags) != (jint)flags);
319 }
320 void clear_suspend_flag(SuspendFlags f) {
321 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
322 uint32_t flags;
323 do {
324 flags = _suspend_flags;
325 }
326 while (Atomic::cmpxchg((jint)(flags & ~f),
327 (volatile jint*)&_suspend_flags,
328 (jint)flags) != (jint)flags);
329 }
330
331 void set_has_async_exception() {
332 set_suspend_flag(_has_async_exception);
333 }
334 void clear_has_async_exception() {
335 clear_suspend_flag(_has_async_exception);
336 }
337
338 // Support for Unhandled Oop detection
339 #ifdef CHECK_UNHANDLED_OOPS
340 private:
341 UnhandledOops *_unhandled_oops;
342 public:
343 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
344 // Mark oop safe for gc. It may be stack allocated but won't move.
345 void allow_unhandled_oop(oop *op) {
346 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
347 }
348 // Clear oops at safepoint so crashes point to unhandled oop violator
349 void clear_unhandled_oops() {
350 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
351 }
352 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
353 #endif // CHECK_UNHANDLED_OOPS
354
355 #ifndef PRODUCT
356 bool skip_gcalot() { return _skip_gcalot; }
357 void set_skip_gcalot(bool v) { _skip_gcalot = v; }
358 #endif
359
360 public:
361 // Installs a pending exception to be inserted later
362 static void send_async_exception(oop thread_oop, oop java_throwable);
363
364 // Resource area
365 ResourceArea* resource_area() const { return _resource_area; }
366 void set_resource_area(ResourceArea* area) { _resource_area = area; }
367
368 OSThread* osthread() const { return _osthread; }
369 void set_osthread(OSThread* thread) { _osthread = thread; }
370
371 // JNI handle support
372 JNIHandleBlock* active_handles() const { return _active_handles; }
373 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
374 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
375 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
376
377 // Internal handle support
378 HandleArea* handle_area() const { return _handle_area; }
379 void set_handle_area(HandleArea* area) { _handle_area = area; }
380
381 // Thread-Local Allocation Buffer (TLAB) support
382 ThreadLocalAllocBuffer& tlab() { return _tlab; }
383 void initialize_tlab() {
384 if (UseTLAB) {
385 tlab().initialize();
386 }
387 }
388
389 // VM operation support
390 int vm_operation_ticket() { return ++_vm_operation_started_count; }
391 int vm_operation_completed_count() { return _vm_operation_completed_count; }
392 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
393
394 // For tracking the heavyweight monitor the thread is pending on.
395 ObjectMonitor* current_pending_monitor() {
396 return _current_pending_monitor;
397 }
398 void set_current_pending_monitor(ObjectMonitor* monitor) {
399 _current_pending_monitor = monitor;
400 }
401 void set_current_pending_monitor_is_from_java(bool from_java) {
402 _current_pending_monitor_is_from_java = from_java;
403 }
404 bool current_pending_monitor_is_from_java() {
405 return _current_pending_monitor_is_from_java;
406 }
407
408 // For tracking the ObjectMonitor on which this thread called Object.wait()
409 ObjectMonitor* current_waiting_monitor() {
410 return _current_waiting_monitor;
411 }
412 void set_current_waiting_monitor(ObjectMonitor* monitor) {
413 _current_waiting_monitor = monitor;
414 }
415
416 // GC support
417 // Apply "f->do_oop" to all root oops in "this".
418 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
419 void oops_do(OopClosure* f, CodeBlobClosure* cf);
420
421 // Handles the parallel case for the method below.
422 private:
423 bool claim_oops_do_par_case(int collection_parity);
424 public:
425 // Requires that "collection_parity" is that of the current strong roots
426 // iteration. If "is_par" is false, sets the parity of "this" to
427 // "collection_parity", and returns "true". If "is_par" is true,
428 // uses an atomic instruction to set the current threads parity to
429 // "collection_parity", if it is not already. Returns "true" iff the
430 // calling thread does the update, this indicates that the calling thread
431 // has claimed the thread's stack as a root groop in the current
432 // collection.
433 bool claim_oops_do(bool is_par, int collection_parity) {
434 if (!is_par) {
435 _oops_do_parity = collection_parity;
436 return true;
437 } else {
438 return claim_oops_do_par_case(collection_parity);
439 }
440 }
441
442 // Sweeper support
443 void nmethods_do(CodeBlobClosure* cf);
444
445 // Used by fast lock support
446 virtual bool is_lock_owned(address adr) const;
447
448 // Check if address is in the stack of the thread (not just for locks).
449 // Warning: the method can only be used on the running thread
450 bool is_in_stack(address adr) const;
451
452 // Sets this thread as starting thread. Returns failure if thread
453 // creation fails due to lack of memory, too many threads etc.
454 bool set_as_starting_thread();
455
456 protected:
457 // OS data associated with the thread
458 OSThread* _osthread; // Platform-specific thread information
459
460 // Thread local resource area for temporary allocation within the VM
461 ResourceArea* _resource_area;
462
463 // Thread local handle area for allocation of handles within the VM
464 HandleArea* _handle_area;
465
466 // Support for stack overflow handling, get_thread, etc.
467 address _stack_base;
468 size_t _stack_size;
469 uintptr_t _self_raw_id; // used by get_thread (mutable)
470 int _lgrp_id;
471
472 public:
473 // Stack overflow support
474 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
475
476 void set_stack_base(address base) { _stack_base = base; }
477 size_t stack_size() const { return _stack_size; }
478 void set_stack_size(size_t size) { _stack_size = size; }
479 void record_stack_base_and_size();
480
481 bool on_local_stack(address adr) const {
482 /* QQQ this has knowledge of direction, ought to be a stack method */
483 return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
484 }
485
486 int lgrp_id() const { return _lgrp_id; }
487 void set_lgrp_id(int value) { _lgrp_id = value; }
488
489 // Printing
490 void print_on(outputStream* st) const;
491 void print() const { print_on(tty); }
492 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
493
494 // Debug-only code
495
496 #ifdef ASSERT
497 private:
498 // Deadlock detection support for Mutex locks. List of locks own by thread.
499 Monitor *_owned_locks;
500 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
501 // thus the friendship
502 friend class Mutex;
503 friend class Monitor;
504
505 public:
506 void print_owned_locks_on(outputStream* st) const;
507 void print_owned_locks() const { print_owned_locks_on(tty); }
508 Monitor * owned_locks() const { return _owned_locks; }
509 bool owns_locks() const { return owned_locks() != NULL; }
510 bool owns_locks_but_compiled_lock() const;
511
512 // Deadlock detection
513 bool allow_allocation() { return _allow_allocation_count == 0; }
514 #endif
515
516 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
517
518 private:
519 volatile int _jvmti_env_iteration_count;
520
521 public:
522 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
523 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
524 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
525
526 // Code generation
527 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
528 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
529 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
530
531 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
532 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
533
534 #define TLAB_FIELD_OFFSET(name) \
535 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
536
537 TLAB_FIELD_OFFSET(start)
538 TLAB_FIELD_OFFSET(end)
539 TLAB_FIELD_OFFSET(top)
540 TLAB_FIELD_OFFSET(pf_top)
541 TLAB_FIELD_OFFSET(size) // desired_size
542 TLAB_FIELD_OFFSET(refill_waste_limit)
543 TLAB_FIELD_OFFSET(number_of_refills)
544 TLAB_FIELD_OFFSET(fast_refill_waste)
545 TLAB_FIELD_OFFSET(slow_allocations)
546
547 #undef TLAB_FIELD_OFFSET
548
549 public:
550 volatile intptr_t _Stalled ;
551 volatile int _TypeTag ;
552 ParkEvent * _ParkEvent ; // for synchronized()
553 ParkEvent * _SleepEvent ; // for Thread.sleep
554 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
555 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
556 int NativeSyncRecursion ; // diagnostic
557
558 volatile int _OnTrap ; // Resume-at IP delta
559 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
560 jint _hashStateX ; // thread-specific hashCode generator state
561 jint _hashStateY ;
562 jint _hashStateZ ;
563 void * _schedctl ;
564
565 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
566 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
567 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
568
569 volatile jint rng [4] ; // RNG for spin loop
570
571 // Low-level leaf-lock primitives used to implement synchronization
572 // and native monitor-mutex infrastructure.
573 // Not for general synchronization use.
574 static void SpinAcquire (volatile int * Lock, const char * Name) ;
575 static void SpinRelease (volatile int * Lock) ;
576 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
577 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
578 static void muxRelease (volatile intptr_t * Lock) ;
579 };
580
581 // Inline implementation of Thread::current()
582 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
583 // startup.
584 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
585 // period. This is inlined in thread_<os_family>.inline.hpp.
586
587 inline Thread* Thread::current() {
588 #ifdef ASSERT
589 // This function is very high traffic. Define PARANOID to enable expensive
590 // asserts.
591 #ifdef PARANOID
592 // Signal handler should call ThreadLocalStorage::get_thread_slow()
593 Thread* t = ThreadLocalStorage::get_thread_slow();
594 assert(t != NULL && !t->is_inside_signal_handler(),
595 "Don't use Thread::current() inside signal handler");
596 #endif
597 #endif
598 Thread* thread = ThreadLocalStorage::thread();
599 assert(thread != NULL, "just checking");
600 return thread;
601 }
602
603 // Name support for threads. non-JavaThread subclasses with multiple
604 // uniquely named instances should derive from this.
605 class NamedThread: public Thread {
606 friend class VMStructs;
607 enum {
608 max_name_len = 64
609 };
610 private:
611 char* _name;
612 // log JavaThread being processed by oops_do
613 JavaThread* _processed_thread;
614
615 public:
616 NamedThread();
617 ~NamedThread();
618 // May only be called once per thread.
619 void set_name(const char* format, ...);
620 virtual bool is_Named_thread() const { return true; }
621 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
622 JavaThread *processed_thread() { return _processed_thread; }
623 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
624 };
625
626 // Worker threads are named and have an id of an assigned work.
627 class WorkerThread: public NamedThread {
628 private:
629 uint _id;
630 public:
631 WorkerThread() : _id(0) { }
632 void set_id(uint work_id) { _id = work_id; }
633 uint id() const { return _id; }
634 };
635
636 // A single WatcherThread is used for simulating timer interrupts.
637 class WatcherThread: public Thread {
638 friend class VMStructs;
639 public:
640 virtual void run();
641
642 private:
643 static WatcherThread* _watcher_thread;
644
645 volatile static bool _should_terminate; // updated without holding lock
646 public:
647 enum SomeConstants {
648 delay_interval = 10 // interrupt delay in milliseconds
649 };
650
651 // Constructor
652 WatcherThread();
653
654 // Tester
655 bool is_Watcher_thread() const { return true; }
656
657 // Printing
658 char* name() const { return (char*)"VM Periodic Task Thread"; }
659 void print_on(outputStream* st) const;
660 void print() const { print_on(tty); }
661
662 // Returns the single instance of WatcherThread
663 static WatcherThread* watcher_thread() { return _watcher_thread; }
664
665 // Create and start the single instance of WatcherThread, or stop it on shutdown
666 static void start();
667 static void stop();
668 };
669
670
671 class CompilerThread;
672
673 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
674
675 class JavaThread: public Thread {
676 friend class VMStructs;
677 private:
678 JavaThread* _next; // The next thread in the Threads list
679 oop _threadObj; // The Java level thread object
680
681 #ifdef ASSERT
682 private:
683 int _java_call_counter;
684
685 public:
686 int java_call_counter() { return _java_call_counter; }
687 void inc_java_call_counter() { _java_call_counter++; }
688 void dec_java_call_counter() {
689 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
690 _java_call_counter--;
691 }
692 private: // restore original namespace restriction
693 #endif // ifdef ASSERT
694
695 #ifndef PRODUCT
696 public:
697 enum {
698 jump_ring_buffer_size = 16
699 };
700 private: // restore original namespace restriction
701 #endif
702
703 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
704
705 ThreadFunction _entry_point;
706
707 JNIEnv _jni_environment;
708
709 // Deopt support
710 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
711
712 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
713 // transition out of native
714 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
715 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
716 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
717 // Because deoptimization is lazy we must save jvmti requests to set locals
718 // in compiled frames until we deoptimize and we have an interpreter frame.
719 // This holds the pointer to array (yeah like there might be more than one) of
720 // description of compiled vframes that have locals that need to be updated.
721 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
722
723 // Handshake value for fixing 6243940. We need a place for the i2c
724 // adapter to store the callee methodOop. This value is NEVER live
725 // across a gc point so it does NOT have to be gc'd
726 // The handshake is open ended since we can't be certain that it will
727 // be NULLed. This is because we rarely ever see the race and end up
728 // in handle_wrong_method which is the backend of the handshake. See
729 // code in i2c adapters and handle_wrong_method.
730
731 methodOop _callee_target;
732
733 // Oop results of VM runtime calls
734 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
735 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
736
737 // See ReduceInitialCardMarks: this holds the precise space interval of
738 // the most recent slow path allocation for which compiled code has
739 // elided card-marks for performance along the fast-path.
740 MemRegion _deferred_card_mark;
741
742 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
743 // allocated during deoptimization
744 // and by JNI_MonitorEnter/Exit
745
746 // Async. requests support
747 enum AsyncRequests {
748 _no_async_condition = 0,
749 _async_exception,
750 _async_unsafe_access_error
751 };
752 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
753 oop _pending_async_exception;
754
755 // Safepoint support
756 public: // Expose _thread_state for SafeFetchInt()
757 volatile JavaThreadState _thread_state;
758 private:
759 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
760 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
761
762 // JavaThread termination support
763 enum TerminatedTypes {
764 _not_terminated = 0xDEAD - 2,
765 _thread_exiting, // JavaThread::exit() has been called for this thread
766 _thread_terminated, // JavaThread is removed from thread list
767 _vm_exited // JavaThread is still executing native code, but VM is terminated
768 // only VM_Exit can set _vm_exited
769 };
770
771 // In general a JavaThread's _terminated field transitions as follows:
772 //
773 // _not_terminated => _thread_exiting => _thread_terminated
774 //
775 // _vm_exited is a special value to cover the case of a JavaThread
776 // executing native code after the VM itself is terminated.
777 TerminatedTypes _terminated;
778 // suspend/resume support
779 volatile bool _suspend_equivalent; // Suspend equivalent condition
780 jint _in_deopt_handler; // count of deoptimization
781 // handlers thread is in
782 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
783 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
784 // never locked) when throwing an exception. Used by interpreter only.
785
786 // Flag to mark a JNI thread in the process of attaching - See CR 6404306
787 // This flag is never set true other than at construction, and in that case
788 // is shortly thereafter set false
789 volatile bool _is_attaching;
790
791 public:
792 // State of the stack guard pages for this thread.
793 enum StackGuardState {
794 stack_guard_unused, // not needed
795 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
796 stack_guard_enabled // enabled
797 };
798
799 private:
800
801 StackGuardState _stack_guard_state;
802
803 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
804 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
805 // code)
806 volatile oop _exception_oop; // Exception thrown in compiled code
807 volatile address _exception_pc; // PC where exception happened
808 volatile address _exception_handler_pc; // PC for handler of exception
809 volatile int _exception_stack_size; // Size of frame where exception happened
810 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
811
812 // support for compilation
813 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
814
815 // support for JNI critical regions
816 jint _jni_active_critical; // count of entries into JNI critical region
817
818 // For deadlock detection.
819 int _depth_first_number;
820
821 // JVMTI PopFrame support
822 // This is set to popframe_pending to signal that top Java frame should be popped immediately
823 int _popframe_condition;
824
825 #ifndef PRODUCT
826 int _jmp_ring_index;
827 struct {
828 // We use intptr_t instead of address so debugger doesn't try and display strings
829 intptr_t _target;
830 intptr_t _instruction;
831 const char* _file;
832 int _line;
833 } _jmp_ring[ jump_ring_buffer_size ];
834 #endif /* PRODUCT */
835
836 #ifndef SERIALGC
837 // Support for G1 barriers
838
839 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
840 // Set of all such queues.
841 static SATBMarkQueueSet _satb_mark_queue_set;
842
843 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
844 // Set of all such queues.
845 static DirtyCardQueueSet _dirty_card_queue_set;
846
847 void flush_barrier_queues();
848 #endif // !SERIALGC
849
850 friend class VMThread;
851 friend class ThreadWaitTransition;
852 friend class VM_Exit;
853
854 void initialize(); // Initialized the instance variables
855
856 public:
857 // Constructor
858 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads
859 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
860 ~JavaThread();
861
862 #ifdef ASSERT
863 // verify this JavaThread hasn't be published in the Threads::list yet
864 void verify_not_published();
865 #endif
866
867 //JNI functiontable getter/setter for JVMTI jni function table interception API.
868 void set_jni_functions(struct JNINativeInterface_* functionTable) {
869 _jni_environment.functions = functionTable;
870 }
871 struct JNINativeInterface_* get_jni_functions() {
872 return (struct JNINativeInterface_ *)_jni_environment.functions;
873 }
874
875 // This function is called at thread creation to allow
876 // platform specific thread variables to be initialized.
877 void cache_global_variables();
878
879 // Executes Shutdown.shutdown()
880 void invoke_shutdown_hooks();
881
882 // Cleanup on thread exit
883 enum ExitType {
884 normal_exit,
885 jni_detach
886 };
887 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
888
889 void cleanup_failed_attach_current_thread();
890
891 // Testers
892 virtual bool is_Java_thread() const { return true; }
893
894 // compilation
895 void set_is_compiling(bool f) { _is_compiling = f; }
896 bool is_compiling() const { return _is_compiling; }
897
898 // Thread chain operations
899 JavaThread* next() const { return _next; }
900 void set_next(JavaThread* p) { _next = p; }
901
902 // Thread oop. threadObj() can be NULL for initial JavaThread
903 // (or for threads attached via JNI)
904 oop threadObj() const { return _threadObj; }
905 void set_threadObj(oop p) { _threadObj = p; }
906
907 ThreadPriority java_priority() const; // Read from threadObj()
908
909 // Prepare thread and add to priority queue. If a priority is
910 // not specified, use the priority of the thread object. Threads_lock
911 // must be held while this function is called.
912 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
913
914 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
915 address saved_exception_pc() { return _saved_exception_pc; }
916
917
918 ThreadFunction entry_point() const { return _entry_point; }
919
920 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
921 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
922
923 // Last frame anchor routines
924
925 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
926
927 // last_Java_sp
928 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
929 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
930
931 // last_Java_pc
932
933 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
934
935 // Safepoint support
936 JavaThreadState thread_state() const { return _thread_state; }
937 void set_thread_state(JavaThreadState s) { _thread_state=s; }
938 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
939 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
940 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
941
942 // thread has called JavaThread::exit() or is terminated
943 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
944 // thread is terminated (no longer on the threads list); we compare
945 // against the two non-terminated values so that a freed JavaThread
946 // will also be considered terminated.
947 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
948 void set_terminated(TerminatedTypes t) { _terminated = t; }
949 // special for Threads::remove() which is static:
950 void set_terminated_value() { _terminated = _thread_terminated; }
951 void block_if_vm_exited();
952
953 bool doing_unsafe_access() { return _doing_unsafe_access; }
954 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
955
956 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
957 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
958
959
960 // Suspend/resume support for JavaThread
961
962 private:
963 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
964 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
965
966 public:
967 void java_suspend();
968 void java_resume();
969 int java_suspend_self();
970
971 void check_and_wait_while_suspended() {
972 assert(JavaThread::current() == this, "sanity check");
973
974 bool do_self_suspend;
975 do {
976 // were we externally suspended while we were waiting?
977 do_self_suspend = handle_special_suspend_equivalent_condition();
978 if (do_self_suspend) {
979 // don't surprise the thread that suspended us by returning
980 java_suspend_self();
981 set_suspend_equivalent();
982 }
983 } while (do_self_suspend);
984 }
985 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
986 // Check for async exception in addition to safepoint and suspend request.
987 static void check_special_condition_for_native_trans(JavaThread *thread);
988
989 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
990 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
991 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
992 // Warning: is_ext_suspend_completed() may temporarily drop the
993 // SR_lock to allow the thread to reach a stable thread state if
994 // it is currently in a transient thread state.
995 return is_ext_suspend_completed(false /*!called_by_wait */,
996 SuspendRetryDelay, bits);
997 }
998
999 // We cannot allow wait_for_ext_suspend_completion() to run forever or
1000 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
1001 // passed as the count and delay parameters. Experiments with specific
1002 // calls to wait_for_ext_suspend_completion() can be done by passing
1003 // other values in the code. Experiments with all calls can be done
1004 // via the appropriate -XX options.
1005 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
1006
1007 void set_external_suspend() { set_suspend_flag (_external_suspend); }
1008 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
1009
1010 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
1011 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
1012 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
1013
1014 bool is_external_suspend() const {
1015 return (_suspend_flags & _external_suspend) != 0;
1016 }
1017 // Whenever a thread transitions from native to vm/java it must suspend
1018 // if external|deopt suspend is present.
1019 bool is_suspend_after_native() const {
1020 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
1021 }
1022
1023 // external suspend request is completed
1024 bool is_ext_suspended() const {
1025 return (_suspend_flags & _ext_suspended) != 0;
1026 }
1027
1028 bool is_external_suspend_with_lock() const {
1029 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1030 return is_external_suspend();
1031 }
1032
1033 // Special method to handle a pending external suspend request
1034 // when a suspend equivalent condition lifts.
1035 bool handle_special_suspend_equivalent_condition() {
1036 assert(is_suspend_equivalent(),
1037 "should only be called in a suspend equivalence condition");
1038 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1039 bool ret = is_external_suspend();
1040 if (!ret) {
1041 // not about to self-suspend so clear suspend equivalence
1042 clear_suspend_equivalent();
1043 }
1044 // implied else:
1045 // We have a pending external suspend request so we leave the
1046 // suspend_equivalent flag set until java_suspend_self() sets
1047 // the ext_suspended flag and clears the suspend_equivalent
1048 // flag. This insures that wait_for_ext_suspend_completion()
1049 // will return consistent values.
1050 return ret;
1051 }
1052
1053 // utility methods to see if we are doing some kind of suspension
1054 bool is_being_ext_suspended() const {
1055 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1056 return is_ext_suspended() || is_external_suspend();
1057 }
1058
1059 bool is_suspend_equivalent() const { return _suspend_equivalent; }
1060
1061 void set_suspend_equivalent() { _suspend_equivalent = true; };
1062 void clear_suspend_equivalent() { _suspend_equivalent = false; };
1063
1064 // Thread.stop support
1065 void send_thread_stop(oop throwable);
1066 AsyncRequests clear_special_runtime_exit_condition() {
1067 AsyncRequests x = _special_runtime_exit_condition;
1068 _special_runtime_exit_condition = _no_async_condition;
1069 return x;
1070 }
1071
1072 // Are any async conditions present?
1073 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
1074
1075 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
1076
1077 // these next two are also used for self-suspension and async exception support
1078 void handle_special_runtime_exit_condition(bool check_asyncs = true);
1079
1080 // Return true if JavaThread has an asynchronous condition or
1081 // if external suspension is requested.
1082 bool has_special_runtime_exit_condition() {
1083 // We call is_external_suspend() last since external suspend should
1084 // be less common. Because we don't use is_external_suspend_with_lock
1085 // it is possible that we won't see an asynchronous external suspend
1086 // request that has just gotten started, i.e., SR_lock grabbed but
1087 // _external_suspend field change either not made yet or not visible
1088 // yet. However, this is okay because the request is asynchronous and
1089 // we will see the new flag value the next time through. It's also
1090 // possible that the external suspend request is dropped after
1091 // we have checked is_external_suspend(), we will recheck its value
1092 // under SR_lock in java_suspend_self().
1093 return (_special_runtime_exit_condition != _no_async_condition) ||
1094 is_external_suspend() || is_deopt_suspend();
1095 }
1096
1097 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
1098
1099 void set_pending_async_exception(oop e) {
1100 _pending_async_exception = e;
1101 _special_runtime_exit_condition = _async_exception;
1102 set_has_async_exception();
1103 }
1104
1105 // Fast-locking support
1106 bool is_lock_owned(address adr) const;
1107
1108 // Accessors for vframe array top
1109 // The linked list of vframe arrays are sorted on sp. This means when we
1110 // unpack the head must contain the vframe array to unpack.
1111 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
1112 vframeArray* vframe_array_head() const { return _vframe_array_head; }
1113
1114 // Side structure for defering update of java frame locals until deopt occurs
1115 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
1116 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
1117
1118 // These only really exist to make debugging deopt problems simpler
1119
1120 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
1121 vframeArray* vframe_array_last() const { return _vframe_array_last; }
1122
1123 // The special resourceMark used during deoptimization
1124
1125 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
1126 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
1127
1128 intptr_t* must_deopt_id() { return _must_deopt_id; }
1129 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
1130 void clear_must_deopt_id() { _must_deopt_id = NULL; }
1131
1132 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
1133 nmethod* deopt_nmethod() { return _deopt_nmethod; }
1134
1135 methodOop callee_target() const { return _callee_target; }
1136 void set_callee_target (methodOop x) { _callee_target = x; }
1137
1138 // Oop results of vm runtime calls
1139 oop vm_result() const { return _vm_result; }
1140 void set_vm_result (oop x) { _vm_result = x; }
1141
1142 oop vm_result_2() const { return _vm_result_2; }
1143 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
1144
1145 MemRegion deferred_card_mark() const { return _deferred_card_mark; }
1146 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
1147
1148 // Exception handling for compiled methods
1149 oop exception_oop() const { return _exception_oop; }
1150 int exception_stack_size() const { return _exception_stack_size; }
1151 address exception_pc() const { return _exception_pc; }
1152 address exception_handler_pc() const { return _exception_handler_pc; }
1153 bool is_method_handle_return() const { return _is_method_handle_return == 1; }
1154
1155 void set_exception_oop(oop o) { _exception_oop = o; }
1156 void set_exception_pc(address a) { _exception_pc = a; }
1157 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
1158 void set_exception_stack_size(int size) { _exception_stack_size = size; }
1159 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
1160
1161 // Stack overflow support
1162 inline size_t stack_available(address cur_sp);
1163 address stack_yellow_zone_base()
1164 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
1165 size_t stack_yellow_zone_size()
1166 { return StackYellowPages * os::vm_page_size(); }
1167 address stack_red_zone_base()
1168 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
1169 size_t stack_red_zone_size()
1170 { return StackRedPages * os::vm_page_size(); }
1171 bool in_stack_yellow_zone(address a)
1172 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
1173 bool in_stack_red_zone(address a)
1174 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
1175
1176 void create_stack_guard_pages();
1177 void remove_stack_guard_pages();
1178
1179 void enable_stack_yellow_zone();
1180 void disable_stack_yellow_zone();
1181 void enable_stack_red_zone();
1182 void disable_stack_red_zone();
1183
1184 inline bool stack_yellow_zone_disabled();
1185 inline bool stack_yellow_zone_enabled();
1186
1187 // Attempt to reguard the stack after a stack overflow may have occurred.
1188 // Returns true if (a) guard pages are not needed on this thread, (b) the
1189 // pages are already guarded, or (c) the pages were successfully reguarded.
1190 // Returns false if there is not enough stack space to reguard the pages, in
1191 // which case the caller should unwind a frame and try again. The argument
1192 // should be the caller's (approximate) sp.
1193 bool reguard_stack(address cur_sp);
1194 // Similar to above but see if current stackpoint is out of the guard area
1195 // and reguard if possible.
1196 bool reguard_stack(void);
1197
1198 // Misc. accessors/mutators
1199 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
1200 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
1201 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
1202
1203 #ifndef PRODUCT
1204 void record_jump(address target, address instr, const char* file, int line);
1205 #endif /* PRODUCT */
1206
1207 // For assembly stub generation
1208 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
1209 #ifndef PRODUCT
1210 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
1211 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
1212 #endif /* PRODUCT */
1213 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
1214 static ByteSize last_Java_sp_offset() {
1215 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
1216 }
1217 static ByteSize last_Java_pc_offset() {
1218 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
1219 }
1220 static ByteSize frame_anchor_offset() {
1221 return byte_offset_of(JavaThread, _anchor);
1222 }
1223 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
1224 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
1225 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
1226 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
1227 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
1228 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
1229 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
1230 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
1231 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
1232 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); }
1233 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
1234 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
1235 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
1236
1237 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
1238 static ByteSize should_post_on_exceptions_flag_offset() {
1239 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
1240 }
1241
1242 #ifndef SERIALGC
1243 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
1244 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
1245 #endif // !SERIALGC
1246
1247 // Returns the jni environment for this thread
1248 JNIEnv* jni_environment() { return &_jni_environment; }
1249
1250 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
1251 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
1252 // Only return NULL if thread is off the thread list; starting to
1253 // exit should not return NULL.
1254 if (thread_from_jni_env->is_terminated()) {
1255 thread_from_jni_env->block_if_vm_exited();
1256 return NULL;
1257 } else {
1258 return thread_from_jni_env;
1259 }
1260 }
1261
1262 // JNI critical regions. These can nest.
1263 bool in_critical() { return _jni_active_critical > 0; }
1264 void enter_critical() { assert(Thread::current() == this,
1265 "this must be current thread");
1266 _jni_active_critical++; }
1267 void exit_critical() { assert(Thread::current() == this,
1268 "this must be current thread");
1269 _jni_active_critical--;
1270 assert(_jni_active_critical >= 0,
1271 "JNI critical nesting problem?"); }
1272
1273 // For deadlock detection
1274 int depth_first_number() { return _depth_first_number; }
1275 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
1276
1277 private:
1278 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
1279
1280 public:
1281 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
1282 void add_monitor_chunk(MonitorChunk* chunk);
1283 void remove_monitor_chunk(MonitorChunk* chunk);
1284 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
1285 void inc_in_deopt_handler() { _in_deopt_handler++; }
1286 void dec_in_deopt_handler() {
1287 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
1288 if (_in_deopt_handler > 0) { // robustness
1289 _in_deopt_handler--;
1290 }
1291 }
1292
1293 private:
1294 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
1295
1296 public:
1297
1298 // Frame iteration; calls the function f for all frames on the stack
1299 void frames_do(void f(frame*, const RegisterMap*));
1300
1301 // Memory operations
1302 void oops_do(OopClosure* f, CodeBlobClosure* cf);
1303
1304 // Sweeper operations
1305 void nmethods_do(CodeBlobClosure* cf);
1306
1307 // Memory management operations
1308 void gc_epilogue();
1309 void gc_prologue();
1310
1311 // Misc. operations
1312 char* name() const { return (char*)get_thread_name(); }
1313 void print_on(outputStream* st) const;
1314 void print() const { print_on(tty); }
1315 void print_value();
1316 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
1317 void print_thread_state() const PRODUCT_RETURN;
1318 void print_on_error(outputStream* st, char* buf, int buflen) const;
1319 void verify();
1320 const char* get_thread_name() const;
1321 private:
1322 // factor out low-level mechanics for use in both normal and error cases
1323 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
1324 public:
1325 const char* get_threadgroup_name() const;
1326 const char* get_parent_name() const;
1327
1328 // Accessing frames
1329 frame last_frame() {
1330 _anchor.make_walkable(this);
1331 return pd_last_frame();
1332 }
1333 javaVFrame* last_java_vframe(RegisterMap* reg_map);
1334
1335 // Returns method at 'depth' java or native frames down the stack
1336 // Used for security checks
1337 klassOop security_get_caller_class(int depth);
1338
1339 // Print stack trace in external format
1340 void print_stack_on(outputStream* st);
1341 void print_stack() { print_stack_on(tty); }
1342
1343 // Print stack traces in various internal formats
1344 void trace_stack() PRODUCT_RETURN;
1345 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
1346 void trace_frames() PRODUCT_RETURN;
1347
1348 // Returns the number of stack frames on the stack
1349 int depth() const;
1350
1351 // Function for testing deoptimization
1352 void deoptimize();
1353 void make_zombies();
1354
1355 void deoptimized_wrt_marked_nmethods();
1356
1357 // Profiling operation (see fprofile.cpp)
1358 public:
1359 bool profile_last_Java_frame(frame* fr);
1360
1361 private:
1362 ThreadProfiler* _thread_profiler;
1363 private:
1364 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
1365 friend class FlatProfilerTask; // uses get_thread_profiler.
1366 friend class ThreadProfilerMark; // uses get_thread_profiler.
1367 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
1368 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
1369 ThreadProfiler* result = _thread_profiler;
1370 _thread_profiler = tp;
1371 return result;
1372 }
1373
1374 // Static operations
1375 public:
1376 // Returns the running thread as a JavaThread
1377 static inline JavaThread* current();
1378
1379 // Returns the active Java thread. Do not use this if you know you are calling
1380 // from a JavaThread, as it's slower than JavaThread::current. If called from
1381 // the VMThread, it also returns the JavaThread that instigated the VMThread's
1382 // operation. You may not want that either.
1383 static JavaThread* active();
1384
1385 inline CompilerThread* as_CompilerThread();
1386
1387 public:
1388 virtual void run();
1389 void thread_main_inner();
1390
1391 private:
1392 // PRIVILEGED STACK
1393 PrivilegedElement* _privileged_stack_top;
1394 GrowableArray<oop>* _array_for_gc;
1395 public:
1396
1397 // Returns the privileged_stack information.
1398 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
1399 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
1400 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
1401
1402 public:
1403 // Thread local information maintained by JVMTI.
1404 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
1405 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
1406 // getter is used to get this JavaThread's JvmtiThreadState if it has
1407 // one which means NULL can be returned. JvmtiThreadState::state_for()
1408 // is used to get the specified JavaThread's JvmtiThreadState if it has
1409 // one or it allocates a new JvmtiThreadState for the JavaThread and
1410 // returns it. JvmtiThreadState::state_for() will return NULL only if
1411 // the specified JavaThread is exiting.
1412 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
1413 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
1414 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
1415 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
1416
1417 // JVMTI PopFrame support
1418 // Setting and clearing popframe_condition
1419 // All of these enumerated values are bits. popframe_pending
1420 // indicates that a PopFrame() has been requested and not yet been
1421 // completed. popframe_processing indicates that that PopFrame() is in
1422 // the process of being completed. popframe_force_deopt_reexecution_bit
1423 // indicates that special handling is required when returning to a
1424 // deoptimized caller.
1425 enum PopCondition {
1426 popframe_inactive = 0x00,
1427 popframe_pending_bit = 0x01,
1428 popframe_processing_bit = 0x02,
1429 popframe_force_deopt_reexecution_bit = 0x04
1430 };
1431 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
1432 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
1433 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
1434 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
1435 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
1436 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
1437 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
1438 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
1439 #ifdef CC_INTERP
1440 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
1441 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
1442 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
1443 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
1444 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
1445 #endif
1446
1447 private:
1448 // Saved incoming arguments to popped frame.
1449 // Used only when popped interpreted frame returns to deoptimized frame.
1450 void* _popframe_preserved_args;
1451 int _popframe_preserved_args_size;
1452
1453 public:
1454 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
1455 void* popframe_preserved_args();
1456 ByteSize popframe_preserved_args_size();
1457 WordSize popframe_preserved_args_size_in_words();
1458 void popframe_free_preserved_args();
1459
1460
1461 private:
1462 JvmtiThreadState *_jvmti_thread_state;
1463 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
1464
1465 // Used by the interpreter in fullspeed mode for frame pop, method
1466 // entry, method exit and single stepping support. This field is
1467 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
1468 // It can be set to zero asynchronously (i.e., without a VM operation
1469 // or a lock) so we have to be very careful.
1470 int _interp_only_mode;
1471
1472 public:
1473 // used by the interpreter for fullspeed debugging support (see above)
1474 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
1475 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
1476 int get_interp_only_mode() { return _interp_only_mode; }
1477 void increment_interp_only_mode() { ++_interp_only_mode; }
1478 void decrement_interp_only_mode() { --_interp_only_mode; }
1479
1480 // support for cached flag that indicates whether exceptions need to be posted for this thread
1481 // if this is false, we can avoid deoptimizing when events are thrown
1482 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
1483 private:
1484 int _should_post_on_exceptions_flag;
1485
1486 public:
1487 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
1488 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
1489
1490 private:
1491 ThreadStatistics *_thread_stat;
1492
1493 public:
1494 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
1495
1496 // Return a blocker object for which this thread is blocked parking.
1497 oop current_park_blocker();
1498
1499 private:
1500 static size_t _stack_size_at_create;
1501
1502 public:
1503 static inline size_t stack_size_at_create(void) {
1504 return _stack_size_at_create;
1505 }
1506 static inline void set_stack_size_at_create(size_t value) {
1507 _stack_size_at_create = value;
1508 }
1509
1510 #ifndef SERIALGC
1511 // SATB marking queue support
1512 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
1513 static SATBMarkQueueSet& satb_mark_queue_set() {
1514 return _satb_mark_queue_set;
1515 }
1516
1517 // Dirty card queue support
1518 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
1519 static DirtyCardQueueSet& dirty_card_queue_set() {
1520 return _dirty_card_queue_set;
1521 }
1522 #endif // !SERIALGC
1523
1524 // This method initializes the SATB and dirty card queues before a
1525 // JavaThread is added to the Java thread list. Right now, we don't
1526 // have to do anything to the dirty card queue (it should have been
1527 // activated when the thread was created), but we have to activate
1528 // the SATB queue if the thread is created while a marking cycle is
1529 // in progress. The activation / de-activation of the SATB queues at
1530 // the beginning / end of a marking cycle is done during safepoints
1531 // so we have to make sure this method is called outside one to be
1532 // able to safely read the active field of the SATB queue set. Right
1533 // now, it is called just before the thread is added to the Java
1534 // thread list in the Threads::add() method. That method is holding
1535 // the Threads_lock which ensures we are outside a safepoint. We
1536 // cannot do the obvious and set the active field of the SATB queue
1537 // when the thread is created given that, in some cases, safepoints
1538 // might happen between the JavaThread constructor being called and the
1539 // thread being added to the Java thread list (an example of this is
1540 // when the structure for the DestroyJavaVM thread is created).
1541 #ifndef SERIALGC
1542 void initialize_queues();
1543 #else // !SERIALGC
1544 void initialize_queues() { }
1545 #endif // !SERIALGC
1546
1547 // Machine dependent stuff
1548 #ifdef TARGET_OS_ARCH_linux_x86
1549 # include "thread_linux_x86.hpp"
1550 #endif
1551 #ifdef TARGET_OS_ARCH_linux_sparc
1552 # include "thread_linux_sparc.hpp"
1553 #endif
1554 #ifdef TARGET_OS_ARCH_linux_zero
1555 # include "thread_linux_zero.hpp"
1556 #endif
1557 #ifdef TARGET_OS_ARCH_solaris_x86
1558 # include "thread_solaris_x86.hpp"
1559 #endif
1560 #ifdef TARGET_OS_ARCH_solaris_sparc
1561 # include "thread_solaris_sparc.hpp"
1562 #endif
1563 #ifdef TARGET_OS_ARCH_windows_x86
1564 # include "thread_windows_x86.hpp"
1565 #endif
1566
1567
1568 public:
1569 void set_blocked_on_compilation(bool value) {
1570 _blocked_on_compilation = value;
1571 }
1572
1573 bool blocked_on_compilation() {
1574 return _blocked_on_compilation;
1575 }
1576 protected:
1577 bool _blocked_on_compilation;
1578
1579
1580 // JSR166 per-thread parker
1581 private:
1582 Parker* _parker;
1583 public:
1584 Parker* parker() { return _parker; }
1585
1586 // Biased locking support
1587 private:
1588 GrowableArray<MonitorInfo*>* _cached_monitor_info;
1589 public:
1590 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
1591 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
1592
1593 // clearing/querying jni attach status
1594 bool is_attaching() const { return _is_attaching; }
1595 void set_attached() { _is_attaching = false; OrderAccess::fence(); }
1596 private:
1597 // This field is used to determine if a thread has claimed
1598 // a par_id: it is -1 if the thread has not claimed a par_id;
1599 // otherwise its value is the par_id that has been claimed.
1600 int _claimed_par_id;
1601 public:
1602 int get_claimed_par_id() { return _claimed_par_id; }
1603 void set_claimed_par_id(int id) { _claimed_par_id = id;}
1604 };
1605
1606 // Inline implementation of JavaThread::current
1607 inline JavaThread* JavaThread::current() {
1608 Thread* thread = ThreadLocalStorage::thread();
1609 assert(thread != NULL && thread->is_Java_thread(), "just checking");
1610 return (JavaThread*)thread;
1611 }
1612
1613 inline CompilerThread* JavaThread::as_CompilerThread() {
1614 assert(is_Compiler_thread(), "just checking");
1615 return (CompilerThread*)this;
1616 }
1617
1618 inline bool JavaThread::stack_yellow_zone_disabled() {
1619 return _stack_guard_state == stack_guard_yellow_disabled;
1620 }
1621
1622 inline bool JavaThread::stack_yellow_zone_enabled() {
1623 #ifdef ASSERT
1624 if (os::uses_stack_guard_pages()) {
1625 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
1626 }
1627 #endif
1628 return _stack_guard_state == stack_guard_enabled;
1629 }
1630
1631 inline size_t JavaThread::stack_available(address cur_sp) {
1632 // This code assumes java stacks grow down
1633 address low_addr; // Limit on the address for deepest stack depth
1634 if ( _stack_guard_state == stack_guard_unused) {
1635 low_addr = stack_base() - stack_size();
1636 } else {
1637 low_addr = stack_yellow_zone_base();
1638 }
1639 return cur_sp > low_addr ? cur_sp - low_addr : 0;
1640 }
1641
1642 // A JavaThread for low memory detection support
1643 class LowMemoryDetectorThread : public JavaThread {
1644 friend class VMStructs;
1645 public:
1646 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {};
1647
1648 // Hide this thread from external view.
1649 bool is_hidden_from_external_view() const { return true; }
1650 };
1651
1652 // A thread used for Compilation.
1653 class CompilerThread : public JavaThread {
1654 friend class VMStructs;
1655 private:
1656 CompilerCounters* _counters;
1657
1658 ciEnv* _env;
1659 CompileLog* _log;
1660 CompileTask* _task;
1661 CompileQueue* _queue;
1662 BufferBlob* _buffer_blob;
1663
1664 public:
1665
1666 static CompilerThread* current();
1667
1668 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
1669
1670 bool is_Compiler_thread() const { return true; }
1671 // Hide this compiler thread from external view.
1672 bool is_hidden_from_external_view() const { return true; }
1673
1674 CompileQueue* queue() { return _queue; }
1675 CompilerCounters* counters() { return _counters; }
1676
1677 // Get/set the thread's compilation environment.
1678 ciEnv* env() { return _env; }
1679 void set_env(ciEnv* env) { _env = env; }
1680
1681 BufferBlob* get_buffer_blob() { return _buffer_blob; }
1682 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
1683
1684 // Get/set the thread's logging information
1685 CompileLog* log() { return _log; }
1686 void init_log(CompileLog* log) {
1687 // Set once, for good.
1688 assert(_log == NULL, "set only once");
1689 _log = log;
1690 }
1691
1692 #ifndef PRODUCT
1693 private:
1694 IdealGraphPrinter *_ideal_graph_printer;
1695 public:
1696 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
1697 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
1698 #endif
1699
1700 // Get/set the thread's current task
1701 CompileTask* task() { return _task; }
1702 void set_task(CompileTask* task) { _task = task; }
1703 };
1704
1705 inline CompilerThread* CompilerThread::current() {
1706 return JavaThread::current()->as_CompilerThread();
1707 }
1708
1709
1710 // The active thread queue. It also keeps track of the current used
1711 // thread priorities.
1712 class Threads: AllStatic {
1713 friend class VMStructs;
1714 private:
1715 static JavaThread* _thread_list;
1716 static int _number_of_threads;
1717 static int _number_of_non_daemon_threads;
1718 static int _return_code;
1719
1720 public:
1721 // Thread management
1722 // force_daemon is a concession to JNI, where we may need to add a
1723 // thread to the thread list before allocating its thread object
1724 static void add(JavaThread* p, bool force_daemon = false);
1725 static void remove(JavaThread* p);
1726 static bool includes(JavaThread* p);
1727 static JavaThread* first() { return _thread_list; }
1728 static void threads_do(ThreadClosure* tc);
1729
1730 // Initializes the vm and creates the vm thread
1731 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
1732 static void convert_vm_init_libraries_to_agents();
1733 static void create_vm_init_libraries();
1734 static void create_vm_init_agents();
1735 static void shutdown_vm_agents();
1736 static bool destroy_vm();
1737 // Supported VM versions via JNI
1738 // Includes JNI_VERSION_1_1
1739 static jboolean is_supported_jni_version_including_1_1(jint version);
1740 // Does not include JNI_VERSION_1_1
1741 static jboolean is_supported_jni_version(jint version);
1742
1743 // Garbage collection
1744 static void follow_other_roots(void f(oop*));
1745
1746 // Apply "f->do_oop" to all root oops in all threads.
1747 // This version may only be called by sequential code.
1748 static void oops_do(OopClosure* f, CodeBlobClosure* cf);
1749 // This version may be called by sequential or parallel code.
1750 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
1751 // This creates a list of GCTasks, one per thread.
1752 static void create_thread_roots_tasks(GCTaskQueue* q);
1753 // This creates a list of GCTasks, one per thread, for marking objects.
1754 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
1755
1756 // Apply "f->do_oop" to roots in all threads that
1757 // are part of compiled frames
1758 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
1759
1760 static void convert_hcode_pointers();
1761 static void restore_hcode_pointers();
1762
1763 // Sweeper
1764 static void nmethods_do(CodeBlobClosure* cf);
1765
1766 static void gc_epilogue();
1767 static void gc_prologue();
1768
1769 // Verification
1770 static void verify();
1771 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
1772 static void print(bool print_stacks, bool internal_format) {
1773 // this function is only used by debug.cpp
1774 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
1775 }
1776 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
1777
1778 // Get Java threads that are waiting to enter a monitor. If doLock
1779 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1780 // VM needs to be at a safepoint.
1781 static GrowableArray<JavaThread*>* get_pending_threads(int count,
1782 address monitor, bool doLock);
1783
1784 // Get owning Java thread from the monitor's owner field. If doLock
1785 // is true, then Threads_lock is grabbed as needed. Otherwise, the
1786 // VM needs to be at a safepoint.
1787 static JavaThread *owning_thread_from_monitor_owner(address owner,
1788 bool doLock);
1789
1790 // Number of threads on the active threads list
1791 static int number_of_threads() { return _number_of_threads; }
1792 // Number of non-daemon threads on the active threads list
1793 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
1794
1795 // Deoptimizes all frames tied to marked nmethods
1796 static void deoptimized_wrt_marked_nmethods();
1797
1798 };
1799
1800
1801 // Thread iterator
1802 class ThreadClosure: public StackObj {
1803 public:
1804 virtual void do_thread(Thread* thread) = 0;
1805 };
1806
1807 class SignalHandlerMark: public StackObj {
1808 private:
1809 Thread* _thread;
1810 public:
1811 SignalHandlerMark(Thread* t) {
1812 _thread = t;
1813 if (_thread) _thread->enter_signal_handler();
1814 }
1815 ~SignalHandlerMark() {
1816 if (_thread) _thread->leave_signal_handler();
1817 _thread = NULL;
1818 }
1819 };
1820
1821
1822 #endif // SHARE_VM_RUNTIME_THREAD_HPP