505 // (< 0 indicates the frame is not walkable).
506 // frames - the ASGCT_CallFrames that make up this trace. Callee followed by callers.
507 //
508 // ASGCT_CallFrame:
509 // typedef struct {
510 // jint lineno;
511 // jmethodID method_id;
512 // } ASGCT_CallFrame;
513 //
514 // Fields:
515 // 1) For Java frame (interpreted and compiled),
516 // lineno - bci of the method being executed or -1 if bci is not available
517 // method_id - jmethodID of the method being executed
518 // 2) For native method
519 // lineno - (-3)
520 // method_id - jmethodID of the method being executed
521
522 extern "C" {
523 JNIEXPORT
524 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) {
525
526 // This is if'd out because we no longer use thread suspension.
527 // However if someone wanted to backport this to a 5.0 jvm then this
528 // code would be important.
529 #if 0
530 if (SafepointSynchronize::is_synchronizing()) {
531 // The safepoint mechanism is trying to synchronize all the threads.
532 // Since this can involve thread suspension, it is not safe for us
533 // to be here. We can reduce the deadlock risk window by quickly
534 // returning to the SIGPROF handler. However, it is still possible
535 // for VMThread to catch us here or in the SIGPROF handler. If we
536 // are suspended while holding a resource and another thread blocks
537 // on that resource in the SIGPROF handler, then we will have a
538 // three-thread deadlock (VMThread, this thread, the other thread).
539 trace->num_frames = ticks_safepoint; // -10
540 return;
541 }
542 #endif
543
544 JavaThread* thread;
545
546 if (trace->env_id == NULL ||
547 (thread = JavaThread::thread_from_jni_environment(trace->env_id)) == NULL ||
548 thread->is_exiting()) {
549
550 // bad env_id, thread has exited or thread is exiting
551 trace->num_frames = ticks_thread_exit; // -8
552 return;
553 }
554
555 if (thread->in_deopt_handler()) {
556 // thread is in the deoptimization handler so return no frames
557 trace->num_frames = ticks_deopt; // -9
558 return;
559 }
560
561 assert(JavaThread::current() == thread,
562 "AsyncGetCallTrace must be called by the current interrupted thread");
563
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505 // (< 0 indicates the frame is not walkable).
506 // frames - the ASGCT_CallFrames that make up this trace. Callee followed by callers.
507 //
508 // ASGCT_CallFrame:
509 // typedef struct {
510 // jint lineno;
511 // jmethodID method_id;
512 // } ASGCT_CallFrame;
513 //
514 // Fields:
515 // 1) For Java frame (interpreted and compiled),
516 // lineno - bci of the method being executed or -1 if bci is not available
517 // method_id - jmethodID of the method being executed
518 // 2) For native method
519 // lineno - (-3)
520 // method_id - jmethodID of the method being executed
521
522 extern "C" {
523 JNIEXPORT
524 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) {
525 JavaThread* thread;
526
527 if (trace->env_id == NULL ||
528 (thread = JavaThread::thread_from_jni_environment(trace->env_id)) == NULL ||
529 thread->is_exiting()) {
530
531 // bad env_id, thread has exited or thread is exiting
532 trace->num_frames = ticks_thread_exit; // -8
533 return;
534 }
535
536 if (thread->in_deopt_handler()) {
537 // thread is in the deoptimization handler so return no frames
538 trace->num_frames = ticks_deopt; // -9
539 return;
540 }
541
542 assert(JavaThread::current() == thread,
543 "AsyncGetCallTrace must be called by the current interrupted thread");
544
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