2 * mono-threads.c: Low-level threading
5 * Rodrigo Kumpera (kumpera@gmail.com)
7 * Copyright 2011 Novell, Inc (http://www.novell.com)
8 * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
9 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
14 /* enable pthread extensions */
16 #define _DARWIN_C_SOURCE
19 #include <mono/utils/mono-compiler.h>
20 #include <mono/utils/mono-os-semaphore.h>
21 #include <mono/utils/mono-threads.h>
22 #include <mono/utils/mono-tls.h>
23 #include <mono/utils/hazard-pointer.h>
24 #include <mono/utils/mono-memory-model.h>
25 #include <mono/utils/mono-mmap.h>
26 #include <mono/utils/atomic.h>
27 #include <mono/utils/mono-time.h>
28 #include <mono/utils/mono-lazy-init.h>
29 #include <mono/utils/mono-coop-mutex.h>
30 #include <mono/utils/mono-coop-semaphore.h>
31 #include <mono/utils/mono-threads-coop.h>
32 #include <mono/utils/mono-threads-debug.h>
33 #include <mono/utils/os-event.h>
38 #include <mono/utils/mach-support.h>
42 Mutex that makes sure only a single thread can be suspending others.
43 Suspend is a very racy operation since it requires restarting until
44 the target thread is not on an unsafe region.
46 We could implement this using critical regions, but would be much much
47 harder for an operation that is hardly performance critical.
49 The GC has to acquire this lock before starting a STW to make sure
50 a runtime suspend won't make it wronly see a thread in a safepoint
51 when it is in fact not.
53 This has to be a naked locking primitive, and not a coop aware one, as
54 it needs to be usable when destroying thread_info_key, the TLS key for
55 the current MonoThreadInfo. In this case, mono_thread_info_current_unchecked,
56 (which is used inside MONO_ENTER_GC_SAFE), would return NULL, leading
57 to an assertion error. We then simply switch state manually in
58 mono_thread_info_suspend_lock_with_info.
60 static MonoSemType global_suspend_semaphore;
62 static size_t thread_info_size;
63 static MonoThreadInfoCallbacks threads_callbacks;
64 static MonoThreadInfoRuntimeCallbacks runtime_callbacks;
65 static MonoNativeTlsKey thread_info_key, thread_exited_key;
67 static __thread guint32 tls_small_id MONO_TLS_FAST;
69 static MonoNativeTlsKey small_id_key;
71 static MonoLinkedListSet thread_list;
72 static gboolean mono_threads_inited = FALSE;
74 static MonoSemType suspend_semaphore;
75 static size_t pending_suspends;
77 #define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & THREAD_STATE_MASK)
80 #define SLEEP_DURATION_BEFORE_WARNING (50)
82 #define SLEEP_DURATION_BEFORE_ABORT MONO_INFINITE_WAIT
84 static guint32 sleepWarnDuration = SLEEP_DURATION_BEFORE_WARNING,
85 sleepAbortDuration = SLEEP_DURATION_BEFORE_ABORT;
87 static int suspend_posts, resume_posts, abort_posts, waits_done, pending_ops;
90 mono_threads_notify_initiator_of_abort (MonoThreadInfo* info)
92 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-ABORT] %p\n", mono_thread_info_get_tid (info));
93 InterlockedIncrement (&abort_posts);
94 mono_os_sem_post (&suspend_semaphore);
98 mono_threads_notify_initiator_of_suspend (MonoThreadInfo* info)
100 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-SUSPEND] %p\n", mono_thread_info_get_tid (info));
101 InterlockedIncrement (&suspend_posts);
102 mono_os_sem_post (&suspend_semaphore);
106 mono_threads_notify_initiator_of_resume (MonoThreadInfo* info)
108 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-RESUME] %p\n", mono_thread_info_get_tid (info));
109 InterlockedIncrement (&resume_posts);
110 mono_os_sem_post (&suspend_semaphore);
114 begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
116 if (mono_threads_is_coop_enabled ()) {
117 /* There's nothing else to do after we async request the thread to suspend */
118 mono_threads_add_to_pending_operation_set (info);
122 return mono_threads_suspend_begin_async_suspend (info, interrupt_kernel);
126 check_async_suspend (MonoThreadInfo *info)
128 if (mono_threads_is_coop_enabled ()) {
129 /* Async suspend can't async fail on coop */
133 return mono_threads_suspend_check_suspend_result (info);
137 resume_async_suspended (MonoThreadInfo *info)
139 if (mono_threads_is_coop_enabled ())
140 g_assert_not_reached ();
142 g_assert (mono_threads_suspend_begin_async_resume (info));
146 resume_self_suspended (MonoThreadInfo* info)
148 THREADS_SUSPEND_DEBUG ("**BEGIN self-resume %p\n", mono_thread_info_get_tid (info));
149 mono_os_sem_post (&info->resume_semaphore);
153 mono_thread_info_wait_for_resume (MonoThreadInfo* info)
156 THREADS_SUSPEND_DEBUG ("**WAIT self-resume %p\n", mono_thread_info_get_tid (info));
157 res = mono_os_sem_wait (&info->resume_semaphore, MONO_SEM_FLAGS_NONE);
158 g_assert (res != -1);
162 resume_blocking_suspended (MonoThreadInfo* info)
164 THREADS_SUSPEND_DEBUG ("**BEGIN blocking-resume %p\n", mono_thread_info_get_tid (info));
165 mono_os_sem_post (&info->resume_semaphore);
169 mono_threads_add_to_pending_operation_set (MonoThreadInfo* info)
171 THREADS_SUSPEND_DEBUG ("added %p to pending suspend\n", mono_thread_info_get_tid (info));
173 InterlockedIncrement (&pending_ops);
177 mono_threads_begin_global_suspend (void)
179 size_t ps = pending_suspends;
180 if (G_UNLIKELY (ps != 0))
181 g_error ("pending_suspends = %d, but must be 0", ps);
182 THREADS_SUSPEND_DEBUG ("------ BEGIN GLOBAL OP sp %d rp %d ap %d wd %d po %d (sp + rp + ap == wd) (wd == po)\n", suspend_posts, resume_posts,
183 abort_posts, waits_done, pending_ops);
184 g_assert ((suspend_posts + resume_posts + abort_posts) == waits_done);
185 mono_threads_coop_begin_global_suspend ();
189 mono_threads_end_global_suspend (void)
191 size_t ps = pending_suspends;
192 if (G_UNLIKELY (ps != 0))
193 g_error ("pending_suspends = %d, but must be 0", ps);
194 THREADS_SUSPEND_DEBUG ("------ END GLOBAL OP sp %d rp %d ap %d wd %d po %d\n", suspend_posts, resume_posts,
195 abort_posts, waits_done, pending_ops);
196 g_assert ((suspend_posts + resume_posts + abort_posts) == waits_done);
197 mono_threads_coop_end_global_suspend ();
203 MonoThreadInfo *cur = mono_thread_info_current ();
205 MOSTLY_ASYNC_SAFE_PRINTF ("STATE CUE CARD: (? means a positive number, usually 1 or 2, * means any number)\n");
206 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x0\t- starting (GOOD, unless the thread is running managed code)\n");
207 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x1\t- running (BAD, unless it's the gc thread)\n");
208 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x2\t- detached (GOOD, unless the thread is running managed code)\n");
209 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?03\t- async suspended (GOOD)\n");
210 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?04\t- self suspended (GOOD)\n");
211 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?05\t- async suspend requested (BAD)\n");
212 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?06\t- self suspend requested (BAD)\n");
213 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x*07\t- blocking (GOOD)\n");
214 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?08\t- blocking with pending suspend (GOOD)\n");
216 FOREACH_THREAD_SAFE (info) {
218 char thread_name [256] = { 0 };
219 pthread_getname_np (mono_thread_info_get_tid (info), thread_name, 255);
221 MOSTLY_ASYNC_SAFE_PRINTF ("--thread %p id %p [%p] (%s) state %x %s\n", info, (void *) mono_thread_info_get_tid (info), (void*)(size_t)info->native_handle, thread_name, info->thread_state, info == cur ? "GC INITIATOR" : "" );
223 MOSTLY_ASYNC_SAFE_PRINTF ("--thread %p id %p [%p] state %x %s\n", info, (void *) mono_thread_info_get_tid (info), (void*)(size_t)info->native_handle, info->thread_state, info == cur ? "GC INITIATOR" : "" );
225 } FOREACH_THREAD_SAFE_END
229 mono_threads_wait_pending_operations (void)
232 int c = pending_suspends;
234 /* Wait threads to park */
235 THREADS_SUSPEND_DEBUG ("[INITIATOR-WAIT-COUNT] %d\n", c);
236 if (pending_suspends) {
237 MonoStopwatch suspension_time;
238 mono_stopwatch_start (&suspension_time);
239 for (i = 0; i < pending_suspends; ++i) {
240 THREADS_SUSPEND_DEBUG ("[INITIATOR-WAIT-WAITING]\n");
241 InterlockedIncrement (&waits_done);
242 if (mono_os_sem_timedwait (&suspend_semaphore, sleepAbortDuration, MONO_SEM_FLAGS_NONE) == MONO_SEM_TIMEDWAIT_RET_SUCCESS)
244 mono_stopwatch_stop (&suspension_time);
248 MOSTLY_ASYNC_SAFE_PRINTF ("WAITING for %d threads, got %d suspended\n", (int)pending_suspends, i);
249 g_error ("suspend_thread suspend took %d ms, which is more than the allowed %d ms", (int)mono_stopwatch_elapsed_ms (&suspension_time), sleepAbortDuration);
251 mono_stopwatch_stop (&suspension_time);
252 THREADS_SUSPEND_DEBUG ("Suspending %d threads took %d ms.\n", (int)pending_suspends, (int)mono_stopwatch_elapsed_ms (&suspension_time));
256 pending_suspends = 0;
262 //Thread initialization code
265 mono_hazard_pointer_clear_all (MonoThreadHazardPointers *hp, int retain)
268 mono_hazard_pointer_clear (hp, 0);
270 mono_hazard_pointer_clear (hp, 1);
272 mono_hazard_pointer_clear (hp, 2);
276 If return non null Hazard Pointer 1 holds the return value.
279 mono_thread_info_lookup (MonoNativeThreadId id)
281 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
283 if (!mono_lls_find (&thread_list, hp, (uintptr_t)id)) {
284 mono_hazard_pointer_clear_all (hp, -1);
288 mono_hazard_pointer_clear_all (hp, 1);
289 return (MonoThreadInfo *) mono_hazard_pointer_get_val (hp, 1);
293 mono_thread_info_insert (MonoThreadInfo *info)
295 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
297 if (!mono_lls_insert (&thread_list, hp, (MonoLinkedListSetNode*)info)) {
298 mono_hazard_pointer_clear_all (hp, -1);
302 mono_hazard_pointer_clear_all (hp, -1);
307 mono_thread_info_remove (MonoThreadInfo *info)
309 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
312 THREADS_DEBUG ("removing info %p\n", info);
313 res = mono_lls_remove (&thread_list, hp, (MonoLinkedListSetNode*)info);
314 mono_hazard_pointer_clear_all (hp, -1);
319 free_thread_info (gpointer mem)
321 MonoThreadInfo *info = (MonoThreadInfo *) mem;
323 mono_os_sem_destroy (&info->resume_semaphore);
324 mono_threads_suspend_free (info);
330 mono_thread_info_register_small_id (void)
332 int small_id = mono_thread_small_id_alloc ();
333 #ifdef HAVE_KW_THREAD
334 tls_small_id = small_id;
336 mono_native_tls_set_value (small_id_key, GUINT_TO_POINTER (small_id + 1));
342 register_thread (MonoThreadInfo *info, gpointer baseptr)
345 guint8 *staddr = NULL;
346 int small_id = mono_thread_info_register_small_id ();
348 mono_thread_info_set_tid (info, mono_native_thread_id_get ());
349 info->small_id = small_id;
351 info->handle = g_new0 (MonoThreadHandle, 1);
352 info->handle->ref = 1;
353 mono_os_event_init (&info->handle->event, TRUE, FALSE);
355 mono_os_sem_init (&info->resume_semaphore, 0);
357 /*set TLS early so SMR works */
358 mono_native_tls_set_value (thread_info_key, info);
360 THREADS_DEBUG ("registering info %p tid %p small id %x\n", info, mono_thread_info_get_tid (info), info->small_id);
362 if (threads_callbacks.thread_register) {
363 if (threads_callbacks.thread_register (info, baseptr) == NULL) {
364 // g_warning ("thread registation failed\n");
365 mono_native_tls_set_value (thread_info_key, NULL);
371 mono_thread_info_get_stack_bounds (&staddr, &stsize);
374 info->stack_start_limit = staddr;
375 info->stack_end = staddr + stsize;
377 info->stackdata = g_byte_array_new ();
379 mono_threads_suspend_register (info);
382 Transition it before taking any locks or publishing itself to reduce the chance
383 of others witnessing a detached thread.
384 We can reasonably expect that until this thread gets published, no other thread will
385 try to manipulate it.
387 mono_threads_transition_attach (info);
388 mono_thread_info_suspend_lock ();
389 /*If this fail it means a given thread has been registered twice, which doesn't make sense. */
390 result = mono_thread_info_insert (info);
392 mono_thread_info_suspend_unlock ();
397 mono_thread_info_suspend_lock_with_info (MonoThreadInfo *info);
400 mono_threads_signal_thread_handle (MonoThreadHandle* thread_handle);
403 unregister_thread (void *arg)
405 gpointer gc_unsafe_stackdata;
406 MonoThreadInfo *info;
411 info = (MonoThreadInfo *) arg;
413 g_assert (mono_thread_info_is_current (info));
414 g_assert (mono_thread_info_is_live (info));
416 small_id = info->small_id;
418 /* We only enter the GC unsafe region, as when exiting this function, the thread
419 * will be detached, and the current MonoThreadInfo* will be destroyed. */
420 mono_threads_enter_gc_unsafe_region_unbalanced_with_info (info, &gc_unsafe_stackdata);
422 THREADS_DEBUG ("unregistering info %p\n", info);
424 mono_native_tls_set_value (thread_exited_key, GUINT_TO_POINTER (1));
427 * TLS destruction order is not reliable so small_id might be cleaned up
430 #ifndef HAVE_KW_THREAD
431 mono_native_tls_set_value (small_id_key, GUINT_TO_POINTER (info->small_id + 1));
434 /* we need to duplicate it, as the info->handle is going
435 * to be closed when unregistering from the platform */
436 handle = mono_threads_open_thread_handle (info->handle);
439 First perform the callback that requires no locks.
440 This callback has the potential of taking other locks, so we do it before.
441 After it completes, the thread remains functional.
443 if (threads_callbacks.thread_detach)
444 threads_callbacks.thread_detach (info);
446 mono_thread_info_suspend_lock_with_info (info);
449 Now perform the callback that must be done under locks.
450 This will render the thread useless and non-suspendable, so it must
451 be done while holding the suspend lock to give no other thread chance
454 if (threads_callbacks.thread_unregister)
455 threads_callbacks.thread_unregister (info);
457 /* The thread is no longer active, so unref its handle */
458 mono_threads_close_thread_handle (info->handle);
461 result = mono_thread_info_remove (info);
463 mono_threads_transition_detach (info);
465 mono_thread_info_suspend_unlock ();
467 g_byte_array_free (info->stackdata, /*free_segment=*/TRUE);
469 /*now it's safe to free the thread info.*/
470 mono_thread_hazardous_try_free (info, free_thread_info);
471 /* Pump the HP queue */
472 mono_thread_hazardous_try_free_some ();
474 mono_thread_small_id_free (small_id);
476 mono_threads_signal_thread_handle (handle);
478 mono_threads_close_thread_handle (handle);
482 thread_exited_dtor (void *arg)
484 #if defined(__MACH__)
486 * Since we use pthread dtors to clean up thread data, if a thread
487 * is attached to the runtime by another pthread dtor after our dtor
488 * has ran, it will never be detached, leading to various problems
489 * since the thread ids etc. will be reused while they are still in
490 * the threads hashtables etc.
491 * Dtors are called in a loop until all user tls entries are 0,
492 * but the loop has a maximum count (4), so if we set the tls
493 * variable every time, it will remain set when system tls dtors
494 * are ran. This allows mono_thread_info_is_exiting () to detect
495 * whenever the thread is exiting, even if it is executed from a
496 * system tls dtor (i.e. obj-c dealloc methods).
498 mono_native_tls_set_value (thread_exited_key, GUINT_TO_POINTER (1));
503 mono_thread_info_current_unchecked (void)
505 return mono_threads_inited ? (MonoThreadInfo*)mono_native_tls_get_value (thread_info_key) : NULL;
510 mono_thread_info_current (void)
512 MonoThreadInfo *info = (MonoThreadInfo*)mono_native_tls_get_value (thread_info_key);
516 info = mono_thread_info_lookup (mono_native_thread_id_get ()); /*info on HP1*/
519 We might be called during thread cleanup, but we cannot be called after cleanup as happened.
520 The way to distinguish between before, during and after cleanup is the following:
522 -If the TLS key is set, cleanup has not begun;
523 -If the TLS key is clean, but the thread remains registered, cleanup is in progress;
524 -If the thread is nowhere to be found, cleanup has finished.
526 We cannot function after cleanup since there's no way to ensure what will happen.
530 /*We're looking up the current thread which will not be freed until we finish running, so no need to keep it on a HP */
531 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
537 mono_thread_info_get_small_id (void)
539 #ifdef HAVE_KW_THREAD
542 gpointer val = mono_native_tls_get_value (small_id_key);
545 return GPOINTER_TO_INT (val) - 1;
550 mono_thread_info_list_head (void)
556 * mono_threads_attach_tools_thread
558 * Attach the current thread as a tool thread. DON'T USE THIS FUNCTION WITHOUT READING ALL DISCLAIMERS.
560 * A tools thread is a very special kind of thread that needs access to core runtime facilities but should
561 * not be counted as a regular thread for high order facilities such as executing managed code or accessing
564 * This is intended only to tools such as a profiler than needs to be able to use our lock-free support when
565 * doing things like resolving backtraces in their background processing thread.
568 mono_threads_attach_tools_thread (void)
571 MonoThreadInfo *info;
573 /* Must only be called once */
574 g_assert (!mono_native_tls_get_value (thread_info_key));
576 while (!mono_threads_inited) {
577 mono_thread_info_usleep (10);
580 info = mono_thread_info_attach (&dummy);
583 info->tools_thread = TRUE;
587 mono_thread_info_attach (void *baseptr)
589 MonoThreadInfo *info;
590 if (!mono_threads_inited)
593 /* This can happen from DllMain(DLL_THREAD_ATTACH) on Windows, if a
594 * thread is created before an embedding API user initialized Mono. */
595 THREADS_DEBUG ("mono_thread_info_attach called before mono_threads_init\n");
598 g_assert (mono_threads_inited);
601 info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
603 info = (MonoThreadInfo *) g_malloc0 (thread_info_size);
604 THREADS_DEBUG ("attaching %p\n", info);
605 if (!register_thread (info, baseptr))
607 } else if (threads_callbacks.thread_attach) {
608 threads_callbacks.thread_attach (info);
614 mono_thread_info_detach (void)
616 MonoThreadInfo *info;
617 if (!mono_threads_inited)
619 /* This can happen from DllMain(THREAD_DETACH) on Windows, if a thread
620 * is created before an embedding API user initialized Mono. */
621 THREADS_DEBUG ("mono_thread_info_detach called before mono_threads_init\n");
624 info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
626 THREADS_DEBUG ("detaching %p\n", info);
627 unregister_thread (info);
628 mono_native_tls_set_value (thread_info_key, NULL);
633 * mono_thread_info_is_exiting:
635 * Return whenever the current thread is exiting, i.e. it is running pthread
639 mono_thread_info_is_exiting (void)
641 #if defined(__MACH__)
642 if (mono_native_tls_get_value (thread_exited_key) == GUINT_TO_POINTER (1))
650 thread_info_key_dtor (void *arg)
652 /* Put the MonoThreadInfo back for the duration of the
653 * unregister code. In some circumstances the thread needs to
654 * take the GC lock which may block which requires a coop
655 * state transition. */
656 mono_native_tls_set_value (thread_info_key, arg);
657 unregister_thread (arg);
658 mono_native_tls_set_value (thread_info_key, NULL);
663 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t info_size)
666 threads_callbacks = *callbacks;
667 thread_info_size = info_size;
668 const char *sleepLimit;
670 res = mono_native_tls_alloc (&thread_info_key, NULL);
671 res = mono_native_tls_alloc (&thread_exited_key, NULL);
673 res = mono_native_tls_alloc (&thread_info_key, (void *) thread_info_key_dtor);
674 res = mono_native_tls_alloc (&thread_exited_key, (void *) thread_exited_dtor);
679 #ifndef HAVE_KW_THREAD
680 res = mono_native_tls_alloc (&small_id_key, NULL);
684 if ((sleepLimit = g_getenv ("MONO_SLEEP_ABORT_LIMIT")) != NULL) {
686 long threshold = strtol(sleepLimit, NULL, 10);
687 if ((errno == 0) && (threshold >= 40)) {
688 sleepAbortDuration = threshold;
689 sleepWarnDuration = threshold / 20;
691 g_warning("MONO_SLEEP_ABORT_LIMIT must be a number >= 40");
694 mono_os_sem_init (&global_suspend_semaphore, 1);
695 mono_os_sem_init (&suspend_semaphore, 0);
697 mono_lls_init (&thread_list, NULL);
698 mono_thread_smr_init ();
699 mono_threads_suspend_init ();
700 mono_threads_suspend_init_signals ();
701 mono_threads_coop_init ();
703 #if defined(__MACH__)
704 mono_mach_init (thread_info_key);
707 mono_threads_inited = TRUE;
709 g_assert (sizeof (MonoNativeThreadId) <= sizeof (uintptr_t));
713 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks)
715 runtime_callbacks = *callbacks;
718 MonoThreadInfoRuntimeCallbacks *
719 mono_threads_get_runtime_callbacks (void)
721 return &runtime_callbacks;
725 Signal that the current thread wants to be suspended.
726 This function can be called without holding the suspend lock held.
727 To finish suspending, call mono_suspend_check.
730 mono_thread_info_begin_self_suspend (void)
732 MonoThreadInfo *info = mono_thread_info_current_unchecked ();
736 THREADS_SUSPEND_DEBUG ("BEGIN SELF SUSPEND OF %p\n", info);
737 mono_threads_transition_request_self_suspension (info);
741 mono_thread_info_end_self_suspend (void)
743 MonoThreadInfo *info;
745 info = mono_thread_info_current ();
748 THREADS_SUSPEND_DEBUG ("FINISH SELF SUSPEND OF %p\n", info);
750 mono_threads_get_runtime_callbacks ()->thread_state_init (&info->thread_saved_state [SELF_SUSPEND_STATE_INDEX]);
752 /* commit the saved state and notify others if needed */
753 switch (mono_threads_transition_state_poll (info)) {
754 case SelfSuspendResumed:
756 case SelfSuspendWait:
757 mono_thread_info_wait_for_resume (info);
759 case SelfSuspendNotifyAndWait:
760 mono_threads_notify_initiator_of_suspend (info);
761 mono_thread_info_wait_for_resume (info);
762 mono_threads_notify_initiator_of_resume (info);
768 mono_thread_info_core_resume (MonoThreadInfo *info)
770 gboolean res = FALSE;
772 switch (mono_threads_transition_request_resume (info)) {
779 case ResumeInitSelfResume:
780 resume_self_suspended (info);
783 case ResumeInitAsyncResume:
784 resume_async_suspended (info);
787 case ResumeInitBlockingResume:
788 resume_blocking_suspended (info);
797 mono_thread_info_resume (MonoNativeThreadId tid)
799 gboolean result; /* don't initialize it so the compiler can catch unitilized paths. */
800 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
801 MonoThreadInfo *info;
803 THREADS_SUSPEND_DEBUG ("RESUMING tid %p\n", (void*)tid);
805 mono_thread_info_suspend_lock ();
807 info = mono_thread_info_lookup (tid); /*info on HP1*/
813 result = mono_thread_info_core_resume (info);
815 //Wait for the pending resume to finish
816 mono_threads_wait_pending_operations ();
819 mono_thread_info_suspend_unlock ();
820 mono_hazard_pointer_clear (hp, 1);
825 mono_thread_info_begin_suspend (MonoThreadInfo *info)
827 switch (mono_threads_transition_request_async_suspension (info)) {
828 case AsyncSuspendAlreadySuspended:
829 case AsyncSuspendBlocking:
831 case AsyncSuspendWait:
832 mono_threads_add_to_pending_operation_set (info);
834 case AsyncSuspendInitSuspend:
835 return begin_async_suspend (info, FALSE);
837 g_assert_not_reached ();
842 mono_thread_info_begin_resume (MonoThreadInfo *info)
844 return mono_thread_info_core_resume (info);
848 FIXME fix cardtable WB to be out of line and check with the runtime if the target is not the
849 WB trampoline. Another option is to encode wb ranges in MonoJitInfo, but that is somewhat hard.
852 is_thread_in_critical_region (MonoThreadInfo *info)
856 gpointer stack_start;
857 MonoThreadUnwindState *state;
859 /* Are we inside a system critical region? */
860 if (info->inside_critical_region)
863 /* Are we inside a GC critical region? */
864 if (threads_callbacks.mono_thread_in_critical_region && threads_callbacks.mono_thread_in_critical_region (info)) {
868 /* The target thread might be shutting down and the domain might be null, which means no managed code left to run. */
869 state = mono_thread_info_get_suspend_state (info);
870 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
873 stack_start = MONO_CONTEXT_GET_SP (&state->ctx);
874 /* altstack signal handler, sgen can't handle them, so we treat them as critical */
875 if (stack_start < info->stack_start_limit || stack_start >= info->stack_end)
878 if (threads_callbacks.ip_in_critical_region)
879 return threads_callbacks.ip_in_critical_region ((MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN], (char *) MONO_CONTEXT_GET_IP (&state->ctx));
881 ji = mono_jit_info_table_find (
882 (MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
883 (char *) MONO_CONTEXT_GET_IP (&state->ctx));
888 method = mono_jit_info_get_method (ji);
890 return threads_callbacks.mono_method_is_critical (method);
894 mono_thread_info_in_critical_location (MonoThreadInfo *info)
896 return is_thread_in_critical_region (info);
900 The return value is only valid until a matching mono_thread_info_resume is called
902 static MonoThreadInfo*
903 suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel)
905 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
906 MonoThreadInfo *info = mono_thread_info_lookup (tid); /*info on HP1*/
910 switch (mono_threads_transition_request_async_suspension (info)) {
911 case AsyncSuspendAlreadySuspended:
912 mono_hazard_pointer_clear (hp, 1); //XXX this is questionable we got to clean the suspend/resume nonsense of critical sections
914 case AsyncSuspendWait:
915 mono_threads_add_to_pending_operation_set (info);
917 case AsyncSuspendInitSuspend:
918 if (!begin_async_suspend (info, interrupt_kernel)) {
919 mono_hazard_pointer_clear (hp, 1);
923 case AsyncSuspendBlocking:
924 if (interrupt_kernel && mono_threads_suspend_needs_abort_syscall ())
925 mono_threads_suspend_abort_syscall (info);
929 g_assert_not_reached ();
932 //Wait for the pending suspend to finish
933 mono_threads_wait_pending_operations ();
935 if (!check_async_suspend (info)) {
936 mono_thread_info_core_resume (info);
937 mono_threads_wait_pending_operations ();
938 mono_hazard_pointer_clear (hp, 1);
944 static MonoThreadInfo*
945 suspend_sync_nolock (MonoNativeThreadId id, gboolean interrupt_kernel)
947 MonoThreadInfo *info = NULL;
948 int sleep_duration = 0;
950 if (!(info = suspend_sync (id, interrupt_kernel))) {
951 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
955 /*WARNING: We now are in interrupt context until we resume the thread. */
956 if (!is_thread_in_critical_region (info))
959 if (!mono_thread_info_core_resume (info)) {
960 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
963 THREADS_SUSPEND_DEBUG ("RESTARTED thread tid %p\n", (void*)id);
965 /* Wait for the pending resume to finish */
966 mono_threads_wait_pending_operations ();
968 if (sleep_duration == 0)
969 mono_thread_info_yield ();
971 g_usleep (sleep_duration);
973 sleep_duration += 10;
979 mono_thread_info_safe_suspend_and_run (MonoNativeThreadId id, gboolean interrupt_kernel, MonoSuspendThreadCallback callback, gpointer user_data)
982 MonoThreadInfo *info = NULL;
983 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
985 THREADS_SUSPEND_DEBUG ("SUSPENDING tid %p\n", (void*)id);
986 /*FIXME: unify this with self-suspend*/
987 g_assert (id != mono_native_thread_id_get ());
989 /* This can block during stw */
990 mono_thread_info_suspend_lock ();
991 mono_threads_begin_global_suspend ();
993 info = suspend_sync_nolock (id, interrupt_kernel);
997 switch (result = callback (info, user_data)) {
998 case MonoResumeThread:
999 mono_hazard_pointer_set (hp, 1, info);
1000 mono_thread_info_core_resume (info);
1001 mono_threads_wait_pending_operations ();
1006 g_error ("Invalid suspend_and_run callback return value %d", result);
1010 mono_hazard_pointer_clear (hp, 1);
1011 mono_threads_end_global_suspend ();
1012 mono_thread_info_suspend_unlock ();
1016 Inject an assynchronous call into the target thread. The target thread must be suspended and
1017 only a single async call can be setup for a given suspend cycle.
1018 This async call must cause stack unwinding as the current implementation doesn't save enough state
1019 to resume execution of the top-of-stack function. It's an acceptable limitation since this is
1020 currently used only to deliver exceptions.
1023 mono_thread_info_setup_async_call (MonoThreadInfo *info, void (*target_func)(void*), void *user_data)
1025 /* An async call can only be setup on an async suspended thread */
1026 g_assert (mono_thread_info_run_state (info) == STATE_ASYNC_SUSPENDED);
1027 /*FIXME this is a bad assert, we probably should do proper locking and fail if one is already set*/
1028 g_assert (!info->async_target);
1029 info->async_target = target_func;
1030 /* This is not GC tracked */
1031 info->user_data = user_data;
1035 The suspend lock is held during any suspend in progress.
1036 A GC that has safepoints must take this lock as part of its
1037 STW to make sure no unsafe pending suspend is in progress.
1041 mono_thread_info_suspend_lock_with_info (MonoThreadInfo *info)
1044 g_assert (mono_thread_info_is_current (info));
1045 g_assert (mono_thread_info_is_live (info));
1047 MONO_ENTER_GC_SAFE_WITH_INFO(info);
1049 int res = mono_os_sem_wait (&global_suspend_semaphore, MONO_SEM_FLAGS_NONE);
1050 g_assert (res != -1);
1052 MONO_EXIT_GC_SAFE_WITH_INFO;
1056 mono_thread_info_suspend_lock (void)
1058 mono_thread_info_suspend_lock_with_info (mono_thread_info_current_unchecked ());
1062 mono_thread_info_suspend_unlock (void)
1064 mono_os_sem_post (&global_suspend_semaphore);
1068 * This is a very specific function whose only purpose is to
1069 * break a given thread from socket syscalls.
1071 * This only exists because linux won't fail a call to connect
1072 * if the underlying is closed.
1074 * TODO We should cleanup and unify this with the other syscall abort
1078 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid)
1080 MonoThreadHazardPointers *hp;
1081 MonoThreadInfo *info;
1083 if (tid == mono_native_thread_id_get () || !mono_threads_suspend_needs_abort_syscall ())
1086 hp = mono_hazard_pointer_get ();
1087 info = mono_thread_info_lookup (tid);
1091 if (mono_thread_info_run_state (info) == STATE_DETACHED) {
1092 mono_hazard_pointer_clear (hp, 1);
1096 mono_thread_info_suspend_lock ();
1097 mono_threads_begin_global_suspend ();
1099 mono_threads_suspend_abort_syscall (info);
1100 mono_threads_wait_pending_operations ();
1102 mono_hazard_pointer_clear (hp, 1);
1104 mono_threads_end_global_suspend ();
1105 mono_thread_info_suspend_unlock ();
1109 * mono_thread_info_set_is_async_context:
1111 * Set whenever the current thread is in an async context. Some runtime functions might behave
1112 * differently while in an async context in order to be async safe.
1115 mono_thread_info_set_is_async_context (gboolean async_context)
1117 MonoThreadInfo *info = mono_thread_info_current ();
1120 info->is_async_context = async_context;
1124 mono_thread_info_is_async_context (void)
1126 MonoThreadInfo *info = mono_thread_info_current ();
1129 return info->is_async_context;
1136 MonoThreadStart start_routine;
1137 gpointer start_routine_arg;
1139 MonoCoopSem registered;
1140 MonoThreadHandle *handle;
1144 inner_start_thread (gpointer data)
1146 CreateThreadData *thread_data;
1147 MonoThreadInfo *info;
1148 MonoThreadStart start_routine;
1149 gpointer start_routine_arg;
1150 gsize start_routine_res;
1153 thread_data = (CreateThreadData*) data;
1154 g_assert (thread_data);
1156 start_routine = thread_data->start_routine;
1157 start_routine_arg = thread_data->start_routine_arg;
1159 info = mono_thread_info_attach (&dummy);
1160 info->runtime_thread = TRUE;
1162 thread_data->handle = mono_threads_open_thread_handle (info->handle);
1164 mono_coop_sem_post (&thread_data->registered);
1166 if (InterlockedDecrement (&thread_data->ref) == 0) {
1167 mono_coop_sem_destroy (&thread_data->registered);
1168 g_free (thread_data);
1171 /* thread_data is not valid anymore */
1174 /* Run the actual main function of the thread */
1175 start_routine_res = start_routine (start_routine_arg);
1177 mono_thread_info_exit (start_routine_res);
1179 g_assert_not_reached ();
1183 * mono_threads_create_thread:
1185 * Create a new thread executing START with argument ARG. Store its id into OUT_TID.
1186 * Returns: a windows or io-layer handle for the thread.
1189 mono_threads_create_thread (MonoThreadStart start, gpointer arg, gsize * const stack_size, MonoNativeThreadId *out_tid)
1191 CreateThreadData *thread_data;
1193 MonoThreadHandle *ret;
1195 thread_data = g_new0 (CreateThreadData, 1);
1196 thread_data->ref = 2;
1197 thread_data->start_routine = start;
1198 thread_data->start_routine_arg = arg;
1199 mono_coop_sem_init (&thread_data->registered, 0);
1201 res = mono_threads_platform_create_thread (inner_start_thread, (gpointer) thread_data, stack_size, out_tid);
1203 /* ref is not going to be decremented in inner_start_thread */
1204 InterlockedDecrement (&thread_data->ref);
1209 res = mono_coop_sem_wait (&thread_data->registered, MONO_SEM_FLAGS_NONE);
1210 g_assert (res == 0);
1212 ret = thread_data->handle;
1216 if (InterlockedDecrement (&thread_data->ref) == 0) {
1217 mono_coop_sem_destroy (&thread_data->registered);
1218 g_free (thread_data);
1225 * mono_thread_info_get_stack_bounds:
1227 * Return the address and size of the current threads stack. Return NULL as the
1228 * stack address if the stack address cannot be determined.
1231 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize)
1233 guint8 *current = (guint8 *)&stsize;
1234 mono_threads_platform_get_stack_bounds (staddr, stsize);
1238 /* Sanity check the result */
1239 g_assert ((current > *staddr) && (current < *staddr + *stsize));
1241 /* When running under emacs, sometimes staddr is not aligned to a page size */
1242 *staddr = (guint8*)((gssize)*staddr & ~(mono_pagesize () - 1));
1246 mono_thread_info_yield (void)
1248 return mono_threads_platform_yield ();
1250 static mono_lazy_init_t sleep_init = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
1251 static MonoCoopMutex sleep_mutex;
1252 static MonoCoopCond sleep_cond;
1255 sleep_initialize (void)
1257 mono_coop_mutex_init (&sleep_mutex);
1258 mono_coop_cond_init (&sleep_cond);
1262 sleep_interrupt (gpointer data)
1264 mono_coop_mutex_lock (&sleep_mutex);
1265 mono_coop_cond_broadcast (&sleep_cond);
1266 mono_coop_mutex_unlock (&sleep_mutex);
1269 static inline guint32
1270 sleep_interruptable (guint32 ms, gboolean *alerted)
1274 g_assert (INFINITE == G_MAXUINT32);
1280 end = mono_msec_ticks() + ms;
1282 mono_lazy_initialize (&sleep_init, sleep_initialize);
1284 mono_coop_mutex_lock (&sleep_mutex);
1287 if (ms != INFINITE) {
1288 now = mono_msec_ticks();
1293 mono_thread_info_install_interrupt (sleep_interrupt, NULL, alerted);
1295 mono_coop_mutex_unlock (&sleep_mutex);
1296 return WAIT_IO_COMPLETION;
1300 mono_coop_cond_timedwait (&sleep_cond, &sleep_mutex, end - now);
1302 mono_coop_cond_wait (&sleep_cond, &sleep_mutex);
1304 mono_thread_info_uninstall_interrupt (alerted);
1306 mono_coop_mutex_unlock (&sleep_mutex);
1307 return WAIT_IO_COMPLETION;
1311 mono_coop_mutex_unlock (&sleep_mutex);
1317 mono_thread_info_sleep (guint32 ms, gboolean *alerted)
1320 MonoThreadInfo *info;
1322 mono_thread_info_yield ();
1324 info = mono_thread_info_current ();
1325 if (info && mono_thread_info_is_interrupt_state (info))
1326 return WAIT_IO_COMPLETION;
1332 return sleep_interruptable (ms, alerted);
1336 if (ms == INFINITE) {
1339 Sleep (G_MAXUINT32);
1341 sleep (G_MAXUINT32);
1346 #if defined (__linux__) && !defined(PLATFORM_ANDROID)
1347 struct timespec start, target;
1349 /* Use clock_nanosleep () to prevent time drifting problems when nanosleep () is interrupted by signals */
1350 ret = clock_gettime (CLOCK_MONOTONIC, &start);
1351 g_assert (ret == 0);
1354 target.tv_sec += ms / 1000;
1355 target.tv_nsec += (ms % 1000) * 1000000;
1356 if (target.tv_nsec > 999999999) {
1357 target.tv_nsec -= 999999999;
1362 ret = clock_nanosleep (CLOCK_MONOTONIC, TIMER_ABSTIME, &target, NULL);
1367 struct timespec req, rem;
1369 req.tv_sec = ms / 1000;
1370 req.tv_nsec = (ms % 1000) * 1000000;
1373 memset (&rem, 0, sizeof (rem));
1374 ret = nanosleep (&req, &rem);
1376 #endif /* __linux__ */
1385 mono_thread_info_usleep (guint64 us)
1394 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key)
1396 return ((MonoThreadInfo*)info)->tls [key];
1400 * mono_threads_info_tls_set:
1402 * Set the TLS key to VALUE in the info structure. This can be used to obtain
1403 * values of TLS variables for threads other than the current thread.
1404 * This should only be used for infrequently changing TLS variables, and it should
1405 * be paired with setting the real TLS variable since this provides no GC tracking.
1408 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value)
1410 ((MonoThreadInfo*)info)->tls [key] = value;
1413 #if defined(__native_client__)
1414 void nacl_shutdown_gc_thread(void);
1418 * mono_thread_info_exit:
1420 * Exit the current thread.
1421 * This function doesn't return.
1424 mono_thread_info_exit (gsize exit_code)
1426 #if defined(__native_client__)
1427 nacl_shutdown_gc_thread();
1430 mono_thread_info_detach ();
1432 mono_threads_platform_exit (0);
1436 * mono_threads_open_thread_handle:
1438 * Duplicate the handle. The handle needs to be closed by calling
1439 * mono_threads_close_thread_handle () when it is no longer needed.
1442 mono_threads_open_thread_handle (MonoThreadHandle *thread_handle)
1444 guint32 oldref, newref;
1446 g_assert (thread_handle);
1449 oldref = thread_handle->ref;
1451 g_error ("%s: thread_handle %p has ref %u, it should be >= 1", __func__, thread_handle, oldref);
1453 newref = oldref + 1;
1454 } while (InterlockedCompareExchange ((gint32*) &thread_handle->ref, newref, oldref) != oldref);
1456 return thread_handle;
1460 mono_threads_close_thread_handle (MonoThreadHandle *thread_handle)
1462 guint32 oldref, newref;
1464 g_assert (thread_handle);
1467 oldref = thread_handle->ref;
1469 g_error ("%s: thread_handle %p has ref %u, it should be >= 1", __func__, thread_handle, oldref);
1471 newref = oldref - 1;
1472 } while (InterlockedCompareExchange ((gint32*) &thread_handle->ref, newref, oldref) != oldref);
1475 mono_os_event_destroy (&thread_handle->event);
1476 g_free (thread_handle);
1481 mono_threads_signal_thread_handle (MonoThreadHandle* thread_handle)
1483 mono_os_event_set (&thread_handle->event);
1486 #define INTERRUPT_STATE ((MonoThreadInfoInterruptToken*) (size_t) -1)
1488 struct _MonoThreadInfoInterruptToken {
1489 void (*callback) (gpointer data);
1494 * mono_thread_info_install_interrupt: install an interruption token for the current thread.
1496 * - @callback: must be able to be called from another thread and always cancel the wait
1497 * - @data: passed to the callback
1498 * - @interrupted: will be set to TRUE if a token is already installed, FALSE otherwise
1499 * if set to TRUE, it must mean that the thread is in interrupted state
1502 mono_thread_info_install_interrupt (void (*callback) (gpointer data), gpointer data, gboolean *interrupted)
1504 MonoThreadInfo *info;
1505 MonoThreadInfoInterruptToken *previous_token, *token;
1507 g_assert (callback);
1509 g_assert (interrupted);
1510 *interrupted = FALSE;
1512 info = mono_thread_info_current ();
1515 /* The memory of this token can be freed at 2 places:
1516 * - if the token is not interrupted: it will be freed in uninstall, as info->interrupt_token has not been replaced
1517 * by the INTERRUPT_STATE flag value, and it still contains the pointer to the memory location
1518 * - if the token is interrupted: it will be freed in finish, as the token is now owned by the prepare/finish
1519 * functions, and info->interrupt_token does not contains a pointer to the memory anymore */
1520 token = g_new0 (MonoThreadInfoInterruptToken, 1);
1521 token->callback = callback;
1524 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, token, NULL);
1526 if (previous_token) {
1527 if (previous_token != INTERRUPT_STATE)
1528 g_error ("mono_thread_info_install_interrupt: previous_token should be INTERRUPT_STATE (%p), but it was %p", INTERRUPT_STATE, previous_token);
1532 *interrupted = TRUE;
1535 THREADS_INTERRUPT_DEBUG ("interrupt install tid %p token %p previous_token %p interrupted %s\n",
1536 mono_thread_info_get_tid (info), token, previous_token, *interrupted ? "TRUE" : "FALSE");
1540 mono_thread_info_uninstall_interrupt (gboolean *interrupted)
1542 MonoThreadInfo *info;
1543 MonoThreadInfoInterruptToken *previous_token;
1545 g_assert (interrupted);
1546 *interrupted = FALSE;
1548 info = mono_thread_info_current ();
1551 previous_token = (MonoThreadInfoInterruptToken *)InterlockedExchangePointer ((gpointer*) &info->interrupt_token, NULL);
1553 /* only the installer can uninstall the token */
1554 g_assert (previous_token);
1556 if (previous_token == INTERRUPT_STATE) {
1557 /* if it is interrupted, then it is going to be freed in finish interrupt */
1558 *interrupted = TRUE;
1560 g_free (previous_token);
1563 THREADS_INTERRUPT_DEBUG ("interrupt uninstall tid %p previous_token %p interrupted %s\n",
1564 mono_thread_info_get_tid (info), previous_token, *interrupted ? "TRUE" : "FALSE");
1567 static MonoThreadInfoInterruptToken*
1568 set_interrupt_state (MonoThreadInfo *info)
1570 MonoThreadInfoInterruptToken *token, *previous_token;
1574 /* Atomically obtain the token the thread is
1575 * waiting on, and change it to a flag value. */
1578 previous_token = info->interrupt_token;
1580 /* Already interrupted */
1581 if (previous_token == INTERRUPT_STATE) {
1586 token = previous_token;
1587 } while (InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, INTERRUPT_STATE, previous_token) != previous_token);
1593 * mono_thread_info_prepare_interrupt:
1595 * The state of the thread info interrupt token is set to 'interrupted' which means that :
1596 * - if the thread calls one of the WaitFor functions, the function will return with
1597 * WAIT_IO_COMPLETION instead of waiting
1598 * - if the thread was waiting when this function was called, the wait will be broken
1600 * It is possible that the wait functions return WAIT_IO_COMPLETION, but the target thread
1601 * didn't receive the interrupt signal yet, in this case it should call the wait function
1602 * again. This essentially means that the target thread will busy wait until it is ready to
1603 * process the interruption.
1605 MonoThreadInfoInterruptToken*
1606 mono_thread_info_prepare_interrupt (MonoThreadInfo *info)
1608 MonoThreadInfoInterruptToken *token;
1610 token = set_interrupt_state (info);
1612 THREADS_INTERRUPT_DEBUG ("interrupt prepare tid %p token %p\n",
1613 mono_thread_info_get_tid (info), token);
1619 mono_thread_info_finish_interrupt (MonoThreadInfoInterruptToken *token)
1621 THREADS_INTERRUPT_DEBUG ("interrupt finish token %p\n", token);
1626 g_assert (token->callback);
1628 token->callback (token->data);
1634 mono_thread_info_self_interrupt (void)
1636 MonoThreadInfo *info;
1637 MonoThreadInfoInterruptToken *token;
1639 info = mono_thread_info_current ();
1642 token = set_interrupt_state (info);
1645 THREADS_INTERRUPT_DEBUG ("interrupt self tid %p\n",
1646 mono_thread_info_get_tid (info));
1649 /* Clear the interrupted flag of the current thread, set with
1650 * mono_thread_info_self_interrupt, so it can wait again */
1652 mono_thread_info_clear_self_interrupt ()
1654 MonoThreadInfo *info;
1655 MonoThreadInfoInterruptToken *previous_token;
1657 info = mono_thread_info_current ();
1660 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, NULL, INTERRUPT_STATE);
1661 g_assert (previous_token == NULL || previous_token == INTERRUPT_STATE);
1663 THREADS_INTERRUPT_DEBUG ("interrupt clear self tid %p previous_token %p\n", mono_thread_info_get_tid (info), previous_token);
1667 mono_thread_info_is_interrupt_state (MonoThreadInfo *info)
1670 return InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE;
1674 mono_thread_info_describe_interrupt_token (MonoThreadInfo *info, GString *text)
1678 if (!InterlockedReadPointer ((gpointer*) &info->interrupt_token))
1679 g_string_append_printf (text, "not waiting");
1680 else if (InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE)
1681 g_string_append_printf (text, "interrupted state");
1683 g_string_append_printf (text, "waiting");
1687 mono_thread_info_is_current (MonoThreadInfo *info)
1689 return mono_thread_info_get_tid (info) == mono_native_thread_id_get ();
1692 MonoThreadInfoWaitRet
1693 mono_thread_info_wait_one_handle (MonoThreadHandle *thread_handle, guint32 timeout, gboolean alertable)
1695 MonoOSEventWaitRet res;
1697 res = mono_os_event_wait_one (&thread_handle->event, timeout);
1698 if (res == MONO_OS_EVENT_WAIT_RET_SUCCESS_0)
1699 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0;
1700 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1701 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1702 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1703 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1705 g_error ("%s: unknown res value %d", __func__, res);
1708 MonoThreadInfoWaitRet
1709 mono_thread_info_wait_multiple_handle (MonoThreadHandle **thread_handles, gsize nhandles, MonoOSEvent *background_change_event, gboolean waitall, guint32 timeout, gboolean alertable)
1711 MonoOSEventWaitRet res;
1712 MonoOSEvent *thread_events [MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS];
1715 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS);
1716 if (background_change_event)
1717 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS - 1);
1719 for (i = 0; i < nhandles; ++i)
1720 thread_events [i] = &thread_handles [i]->event;
1722 if (background_change_event)
1723 thread_events [nhandles ++] = background_change_event;
1725 res = mono_os_event_wait_multiple (thread_events, nhandles, waitall, timeout);
1726 if (res >= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 && res <= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 + nhandles - 1)
1727 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0 + (res - MONO_OS_EVENT_WAIT_RET_SUCCESS_0);
1728 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1729 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1730 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1731 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1733 g_error ("%s: unknown res value %d", __func__, res);