343 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread.
344
345
346 static void signal_thread_entry(JavaThread* thread, TRAPS) {
347 os::set_priority(thread, NearMaxPriority);
348 while (true) {
349 int sig;
350 {
351 // FIXME : Currently we have not decided what should be the status
352 // for this java thread blocked here. Once we decide about
353 // that we should fix this.
354 sig = os::signal_wait();
355 }
356 if (sig == os::sigexitnum_pd()) {
357 // Terminate the signal thread
358 return;
359 }
360
361 switch (sig) {
362 case SIGBREAK: {
363 // Check if the signal is a trigger to start the Attach Listener - in that
364 // case don't print stack traces.
365 if (!DisableAttachMechanism) {
366 // Attempt to transit state to AL_INITIALIZING.
367 AttachListenerState cur_state = AttachListener::transit_state(AL_INITIALIZING, AL_NOT_INITIALIZED);
368 if (cur_state == AL_INITIALIZING) {
369 // Attach Listener has been started to initialize. Ignore this signal.
370 continue;
371 } else if (cur_state == AL_NOT_INITIALIZED) {
372 // Start to initialize.
373 if (AttachListener::is_init_trigger()) {
374 // Attach Listener has been initialized.
375 // Accept subsequent request.
376 continue;
377 } else {
378 // Attach Listener could not be started.
379 // So we need to transit the state to AL_NOT_INITIALIZED.
380 AttachListener::set_state(AL_NOT_INITIALIZED);
381 }
382 } else if (AttachListener::check_socket_file()) {
383 // Attach Listener has been started, but unix domain socket file
384 // does not exist. So restart Attach Listener.
385 continue;
386 }
387 }
388 // Print stack traces
389 // Any SIGBREAK operations added here should make sure to flush
390 // the output stream (e.g. tty->flush()) after output. See 4803766.
391 // Each module also prints an extra carriage return after its output.
392 VM_PrintThreads op;
393 VMThread::execute(&op);
394 VM_PrintJNI jni_op;
395 VMThread::execute(&jni_op);
396 VM_FindDeadlocks op1(tty);
397 VMThread::execute(&op1);
398 Universe::print_heap_at_SIGBREAK();
399 if (PrintClassHistogram) {
400 VM_GC_HeapInspection op1(tty, true /* force full GC before heap inspection */);
401 VMThread::execute(&op1);
402 }
403 if (JvmtiExport::should_post_data_dump()) {
404 JvmtiExport::post_data_dump();
405 }
406 break;
407 }
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343 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread.
344
345
346 static void signal_thread_entry(JavaThread* thread, TRAPS) {
347 os::set_priority(thread, NearMaxPriority);
348 while (true) {
349 int sig;
350 {
351 // FIXME : Currently we have not decided what should be the status
352 // for this java thread blocked here. Once we decide about
353 // that we should fix this.
354 sig = os::signal_wait();
355 }
356 if (sig == os::sigexitnum_pd()) {
357 // Terminate the signal thread
358 return;
359 }
360
361 switch (sig) {
362 case SIGBREAK: {
363 #if INCLUDE_SERVICES
364 // Check if the signal is a trigger to start the Attach Listener - in that
365 // case don't print stack traces.
366 if (!DisableAttachMechanism) {
367 // Attempt to transit state to AL_INITIALIZING.
368 AttachListenerState cur_state = AttachListener::transit_state(AL_INITIALIZING, AL_NOT_INITIALIZED);
369 if (cur_state == AL_INITIALIZING) {
370 // Attach Listener has been started to initialize. Ignore this signal.
371 continue;
372 } else if (cur_state == AL_NOT_INITIALIZED) {
373 // Start to initialize.
374 if (AttachListener::is_init_trigger()) {
375 // Attach Listener has been initialized.
376 // Accept subsequent request.
377 continue;
378 } else {
379 // Attach Listener could not be started.
380 // So we need to transit the state to AL_NOT_INITIALIZED.
381 AttachListener::set_state(AL_NOT_INITIALIZED);
382 }
383 } else if (AttachListener::check_socket_file()) {
384 // Attach Listener has been started, but unix domain socket file
385 // does not exist. So restart Attach Listener.
386 continue;
387 }
388 }
389 #endif
390 // Print stack traces
391 // Any SIGBREAK operations added here should make sure to flush
392 // the output stream (e.g. tty->flush()) after output. See 4803766.
393 // Each module also prints an extra carriage return after its output.
394 VM_PrintThreads op;
395 VMThread::execute(&op);
396 VM_PrintJNI jni_op;
397 VMThread::execute(&jni_op);
398 VM_FindDeadlocks op1(tty);
399 VMThread::execute(&op1);
400 Universe::print_heap_at_SIGBREAK();
401 if (PrintClassHistogram) {
402 VM_GC_HeapInspection op1(tty, true /* force full GC before heap inspection */);
403 VMThread::execute(&op1);
404 }
405 if (JvmtiExport::should_post_data_dump()) {
406 JvmtiExport::post_data_dump();
407 }
408 break;
409 }
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