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 ji = mono_jit_info_table_find (
879 (MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
880 (char *) MONO_CONTEXT_GET_IP (&state->ctx));
885 method = mono_jit_info_get_method (ji);
887 return threads_callbacks.mono_method_is_critical (method);
891 mono_thread_info_in_critical_location (MonoThreadInfo *info)
893 return is_thread_in_critical_region (info);
897 The return value is only valid until a matching mono_thread_info_resume is called
899 static MonoThreadInfo*
900 suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel)
902 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
903 MonoThreadInfo *info = mono_thread_info_lookup (tid); /*info on HP1*/
907 switch (mono_threads_transition_request_async_suspension (info)) {
908 case AsyncSuspendAlreadySuspended:
909 mono_hazard_pointer_clear (hp, 1); //XXX this is questionable we got to clean the suspend/resume nonsense of critical sections
911 case AsyncSuspendWait:
912 mono_threads_add_to_pending_operation_set (info);
914 case AsyncSuspendInitSuspend:
915 if (!begin_async_suspend (info, interrupt_kernel)) {
916 mono_hazard_pointer_clear (hp, 1);
920 case AsyncSuspendBlocking:
921 if (interrupt_kernel && mono_threads_suspend_needs_abort_syscall ())
922 mono_threads_suspend_abort_syscall (info);
926 g_assert_not_reached ();
929 //Wait for the pending suspend to finish
930 mono_threads_wait_pending_operations ();
932 if (!check_async_suspend (info)) {
933 mono_thread_info_core_resume (info);
934 mono_threads_wait_pending_operations ();
935 mono_hazard_pointer_clear (hp, 1);
941 static MonoThreadInfo*
942 suspend_sync_nolock (MonoNativeThreadId id, gboolean interrupt_kernel)
944 MonoThreadInfo *info = NULL;
945 int sleep_duration = 0;
947 if (!(info = suspend_sync (id, interrupt_kernel))) {
948 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
952 /*WARNING: We now are in interrupt context until we resume the thread. */
953 if (!is_thread_in_critical_region (info))
956 if (!mono_thread_info_core_resume (info)) {
957 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
960 THREADS_SUSPEND_DEBUG ("RESTARTED thread tid %p\n", (void*)id);
962 /* Wait for the pending resume to finish */
963 mono_threads_wait_pending_operations ();
965 if (sleep_duration == 0)
966 mono_thread_info_yield ();
968 g_usleep (sleep_duration);
970 sleep_duration += 10;
976 mono_thread_info_safe_suspend_and_run (MonoNativeThreadId id, gboolean interrupt_kernel, MonoSuspendThreadCallback callback, gpointer user_data)
979 MonoThreadInfo *info = NULL;
980 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
982 THREADS_SUSPEND_DEBUG ("SUSPENDING tid %p\n", (void*)id);
983 /*FIXME: unify this with self-suspend*/
984 g_assert (id != mono_native_thread_id_get ());
986 /* This can block during stw */
987 mono_thread_info_suspend_lock ();
988 mono_threads_begin_global_suspend ();
990 info = suspend_sync_nolock (id, interrupt_kernel);
994 switch (result = callback (info, user_data)) {
995 case MonoResumeThread:
996 mono_hazard_pointer_set (hp, 1, info);
997 mono_thread_info_core_resume (info);
998 mono_threads_wait_pending_operations ();
1003 g_error ("Invalid suspend_and_run callback return value %d", result);
1007 mono_hazard_pointer_clear (hp, 1);
1008 mono_threads_end_global_suspend ();
1009 mono_thread_info_suspend_unlock ();
1013 Inject an assynchronous call into the target thread. The target thread must be suspended and
1014 only a single async call can be setup for a given suspend cycle.
1015 This async call must cause stack unwinding as the current implementation doesn't save enough state
1016 to resume execution of the top-of-stack function. It's an acceptable limitation since this is
1017 currently used only to deliver exceptions.
1020 mono_thread_info_setup_async_call (MonoThreadInfo *info, void (*target_func)(void*), void *user_data)
1022 /* An async call can only be setup on an async suspended thread */
1023 g_assert (mono_thread_info_run_state (info) == STATE_ASYNC_SUSPENDED);
1024 /*FIXME this is a bad assert, we probably should do proper locking and fail if one is already set*/
1025 g_assert (!info->async_target);
1026 info->async_target = target_func;
1027 /* This is not GC tracked */
1028 info->user_data = user_data;
1032 The suspend lock is held during any suspend in progress.
1033 A GC that has safepoints must take this lock as part of its
1034 STW to make sure no unsafe pending suspend is in progress.
1038 mono_thread_info_suspend_lock_with_info (MonoThreadInfo *info)
1041 g_assert (mono_thread_info_is_current (info));
1042 g_assert (mono_thread_info_is_live (info));
1044 MONO_ENTER_GC_SAFE_WITH_INFO(info);
1046 int res = mono_os_sem_wait (&global_suspend_semaphore, MONO_SEM_FLAGS_NONE);
1047 g_assert (res != -1);
1049 MONO_EXIT_GC_SAFE_WITH_INFO;
1053 mono_thread_info_suspend_lock (void)
1055 mono_thread_info_suspend_lock_with_info (mono_thread_info_current_unchecked ());
1059 mono_thread_info_suspend_unlock (void)
1061 mono_os_sem_post (&global_suspend_semaphore);
1065 * This is a very specific function whose only purpose is to
1066 * break a given thread from socket syscalls.
1068 * This only exists because linux won't fail a call to connect
1069 * if the underlying is closed.
1071 * TODO We should cleanup and unify this with the other syscall abort
1075 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid)
1077 MonoThreadHazardPointers *hp;
1078 MonoThreadInfo *info;
1080 if (tid == mono_native_thread_id_get () || !mono_threads_suspend_needs_abort_syscall ())
1083 hp = mono_hazard_pointer_get ();
1084 info = mono_thread_info_lookup (tid);
1088 if (mono_thread_info_run_state (info) == STATE_DETACHED) {
1089 mono_hazard_pointer_clear (hp, 1);
1093 mono_thread_info_suspend_lock ();
1094 mono_threads_begin_global_suspend ();
1096 mono_threads_suspend_abort_syscall (info);
1097 mono_threads_wait_pending_operations ();
1099 mono_hazard_pointer_clear (hp, 1);
1101 mono_threads_end_global_suspend ();
1102 mono_thread_info_suspend_unlock ();
1106 * mono_thread_info_set_is_async_context:
1108 * Set whenever the current thread is in an async context. Some runtime functions might behave
1109 * differently while in an async context in order to be async safe.
1112 mono_thread_info_set_is_async_context (gboolean async_context)
1114 MonoThreadInfo *info = mono_thread_info_current ();
1117 info->is_async_context = async_context;
1121 mono_thread_info_is_async_context (void)
1123 MonoThreadInfo *info = mono_thread_info_current ();
1126 return info->is_async_context;
1133 MonoThreadStart start_routine;
1134 gpointer start_routine_arg;
1136 MonoCoopSem registered;
1137 MonoThreadHandle *handle;
1141 inner_start_thread (gpointer data)
1143 CreateThreadData *thread_data;
1144 MonoThreadInfo *info;
1145 MonoThreadStart start_routine;
1146 gpointer start_routine_arg;
1147 gsize start_routine_res;
1150 thread_data = (CreateThreadData*) data;
1151 g_assert (thread_data);
1153 start_routine = thread_data->start_routine;
1154 start_routine_arg = thread_data->start_routine_arg;
1156 info = mono_thread_info_attach (&dummy);
1157 info->runtime_thread = TRUE;
1159 thread_data->handle = mono_threads_open_thread_handle (info->handle);
1161 mono_coop_sem_post (&thread_data->registered);
1163 if (InterlockedDecrement (&thread_data->ref) == 0) {
1164 mono_coop_sem_destroy (&thread_data->registered);
1165 g_free (thread_data);
1168 /* thread_data is not valid anymore */
1171 /* Run the actual main function of the thread */
1172 start_routine_res = start_routine (start_routine_arg);
1174 mono_thread_info_exit (start_routine_res);
1176 g_assert_not_reached ();
1180 * mono_threads_create_thread:
1182 * Create a new thread executing START with argument ARG. Store its id into OUT_TID.
1183 * Returns: a windows or io-layer handle for the thread.
1186 mono_threads_create_thread (MonoThreadStart start, gpointer arg, gsize * const stack_size, MonoNativeThreadId *out_tid)
1188 CreateThreadData *thread_data;
1190 MonoThreadHandle *ret;
1192 thread_data = g_new0 (CreateThreadData, 1);
1193 thread_data->ref = 2;
1194 thread_data->start_routine = start;
1195 thread_data->start_routine_arg = arg;
1196 mono_coop_sem_init (&thread_data->registered, 0);
1198 res = mono_threads_platform_create_thread (inner_start_thread, (gpointer) thread_data, stack_size, out_tid);
1200 /* ref is not going to be decremented in inner_start_thread */
1201 InterlockedDecrement (&thread_data->ref);
1206 res = mono_coop_sem_wait (&thread_data->registered, MONO_SEM_FLAGS_NONE);
1207 g_assert (res == 0);
1209 ret = thread_data->handle;
1213 if (InterlockedDecrement (&thread_data->ref) == 0) {
1214 mono_coop_sem_destroy (&thread_data->registered);
1215 g_free (thread_data);
1222 * mono_thread_info_get_stack_bounds:
1224 * Return the address and size of the current threads stack. Return NULL as the
1225 * stack address if the stack address cannot be determined.
1228 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize)
1230 guint8 *current = (guint8 *)&stsize;
1231 mono_threads_platform_get_stack_bounds (staddr, stsize);
1235 /* Sanity check the result */
1236 g_assert ((current > *staddr) && (current < *staddr + *stsize));
1238 /* When running under emacs, sometimes staddr is not aligned to a page size */
1239 *staddr = (guint8*)((gssize)*staddr & ~(mono_pagesize () - 1));
1243 mono_thread_info_yield (void)
1245 return mono_threads_platform_yield ();
1247 static mono_lazy_init_t sleep_init = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
1248 static MonoCoopMutex sleep_mutex;
1249 static MonoCoopCond sleep_cond;
1252 sleep_initialize (void)
1254 mono_coop_mutex_init (&sleep_mutex);
1255 mono_coop_cond_init (&sleep_cond);
1259 sleep_interrupt (gpointer data)
1261 mono_coop_mutex_lock (&sleep_mutex);
1262 mono_coop_cond_broadcast (&sleep_cond);
1263 mono_coop_mutex_unlock (&sleep_mutex);
1266 static inline guint32
1267 sleep_interruptable (guint32 ms, gboolean *alerted)
1271 g_assert (INFINITE == G_MAXUINT32);
1277 end = mono_msec_ticks() + ms;
1279 mono_lazy_initialize (&sleep_init, sleep_initialize);
1281 mono_coop_mutex_lock (&sleep_mutex);
1284 if (ms != INFINITE) {
1285 now = mono_msec_ticks();
1290 mono_thread_info_install_interrupt (sleep_interrupt, NULL, alerted);
1292 mono_coop_mutex_unlock (&sleep_mutex);
1293 return WAIT_IO_COMPLETION;
1297 mono_coop_cond_timedwait (&sleep_cond, &sleep_mutex, end - now);
1299 mono_coop_cond_wait (&sleep_cond, &sleep_mutex);
1301 mono_thread_info_uninstall_interrupt (alerted);
1303 mono_coop_mutex_unlock (&sleep_mutex);
1304 return WAIT_IO_COMPLETION;
1308 mono_coop_mutex_unlock (&sleep_mutex);
1314 mono_thread_info_sleep (guint32 ms, gboolean *alerted)
1317 MonoThreadInfo *info;
1319 mono_thread_info_yield ();
1321 info = mono_thread_info_current ();
1322 if (info && mono_thread_info_is_interrupt_state (info))
1323 return WAIT_IO_COMPLETION;
1329 return sleep_interruptable (ms, alerted);
1333 if (ms == INFINITE) {
1336 Sleep (G_MAXUINT32);
1338 sleep (G_MAXUINT32);
1343 #if defined (__linux__) && !defined(PLATFORM_ANDROID)
1344 struct timespec start, target;
1346 /* Use clock_nanosleep () to prevent time drifting problems when nanosleep () is interrupted by signals */
1347 ret = clock_gettime (CLOCK_MONOTONIC, &start);
1348 g_assert (ret == 0);
1351 target.tv_sec += ms / 1000;
1352 target.tv_nsec += (ms % 1000) * 1000000;
1353 if (target.tv_nsec > 999999999) {
1354 target.tv_nsec -= 999999999;
1359 ret = clock_nanosleep (CLOCK_MONOTONIC, TIMER_ABSTIME, &target, NULL);
1364 struct timespec req, rem;
1366 req.tv_sec = ms / 1000;
1367 req.tv_nsec = (ms % 1000) * 1000000;
1370 memset (&rem, 0, sizeof (rem));
1371 ret = nanosleep (&req, &rem);
1373 #endif /* __linux__ */
1382 mono_thread_info_usleep (guint64 us)
1391 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key)
1393 return ((MonoThreadInfo*)info)->tls [key];
1397 * mono_threads_info_tls_set:
1399 * Set the TLS key to VALUE in the info structure. This can be used to obtain
1400 * values of TLS variables for threads other than the current thread.
1401 * This should only be used for infrequently changing TLS variables, and it should
1402 * be paired with setting the real TLS variable since this provides no GC tracking.
1405 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value)
1407 ((MonoThreadInfo*)info)->tls [key] = value;
1410 #if defined(__native_client__)
1411 void nacl_shutdown_gc_thread(void);
1415 * mono_thread_info_exit:
1417 * Exit the current thread.
1418 * This function doesn't return.
1421 mono_thread_info_exit (gsize exit_code)
1423 #if defined(__native_client__)
1424 nacl_shutdown_gc_thread();
1427 mono_thread_info_detach ();
1429 mono_threads_platform_exit (0);
1433 * mono_threads_open_thread_handle:
1435 * Duplicate the handle. The handle needs to be closed by calling
1436 * mono_threads_close_thread_handle () when it is no longer needed.
1439 mono_threads_open_thread_handle (MonoThreadHandle *thread_handle)
1441 guint32 oldref, newref;
1443 g_assert (thread_handle);
1446 oldref = thread_handle->ref;
1448 g_error ("%s: thread_handle %p has ref %u, it should be >= 1", __func__, thread_handle, oldref);
1450 newref = oldref + 1;
1451 } while (InterlockedCompareExchange ((gint32*) &thread_handle->ref, newref, oldref) != oldref);
1453 return thread_handle;
1457 mono_threads_close_thread_handle (MonoThreadHandle *thread_handle)
1459 guint32 oldref, newref;
1461 g_assert (thread_handle);
1464 oldref = thread_handle->ref;
1466 g_error ("%s: thread_handle %p has ref %u, it should be >= 1", __func__, thread_handle, oldref);
1468 newref = oldref - 1;
1469 } while (InterlockedCompareExchange ((gint32*) &thread_handle->ref, newref, oldref) != oldref);
1472 mono_os_event_destroy (&thread_handle->event);
1473 g_free (thread_handle);
1478 mono_threads_signal_thread_handle (MonoThreadHandle* thread_handle)
1480 mono_os_event_set (&thread_handle->event);
1483 #define INTERRUPT_STATE ((MonoThreadInfoInterruptToken*) (size_t) -1)
1485 struct _MonoThreadInfoInterruptToken {
1486 void (*callback) (gpointer data);
1491 * mono_thread_info_install_interrupt: install an interruption token for the current thread.
1493 * - @callback: must be able to be called from another thread and always cancel the wait
1494 * - @data: passed to the callback
1495 * - @interrupted: will be set to TRUE if a token is already installed, FALSE otherwise
1496 * if set to TRUE, it must mean that the thread is in interrupted state
1499 mono_thread_info_install_interrupt (void (*callback) (gpointer data), gpointer data, gboolean *interrupted)
1501 MonoThreadInfo *info;
1502 MonoThreadInfoInterruptToken *previous_token, *token;
1504 g_assert (callback);
1506 g_assert (interrupted);
1507 *interrupted = FALSE;
1509 info = mono_thread_info_current ();
1512 /* The memory of this token can be freed at 2 places:
1513 * - if the token is not interrupted: it will be freed in uninstall, as info->interrupt_token has not been replaced
1514 * by the INTERRUPT_STATE flag value, and it still contains the pointer to the memory location
1515 * - if the token is interrupted: it will be freed in finish, as the token is now owned by the prepare/finish
1516 * functions, and info->interrupt_token does not contains a pointer to the memory anymore */
1517 token = g_new0 (MonoThreadInfoInterruptToken, 1);
1518 token->callback = callback;
1521 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, token, NULL);
1523 if (previous_token) {
1524 if (previous_token != INTERRUPT_STATE)
1525 g_error ("mono_thread_info_install_interrupt: previous_token should be INTERRUPT_STATE (%p), but it was %p", INTERRUPT_STATE, previous_token);
1529 *interrupted = TRUE;
1532 THREADS_INTERRUPT_DEBUG ("interrupt install tid %p token %p previous_token %p interrupted %s\n",
1533 mono_thread_info_get_tid (info), token, previous_token, *interrupted ? "TRUE" : "FALSE");
1537 mono_thread_info_uninstall_interrupt (gboolean *interrupted)
1539 MonoThreadInfo *info;
1540 MonoThreadInfoInterruptToken *previous_token;
1542 g_assert (interrupted);
1543 *interrupted = FALSE;
1545 info = mono_thread_info_current ();
1548 previous_token = (MonoThreadInfoInterruptToken *)InterlockedExchangePointer ((gpointer*) &info->interrupt_token, NULL);
1550 /* only the installer can uninstall the token */
1551 g_assert (previous_token);
1553 if (previous_token == INTERRUPT_STATE) {
1554 /* if it is interrupted, then it is going to be freed in finish interrupt */
1555 *interrupted = TRUE;
1557 g_free (previous_token);
1560 THREADS_INTERRUPT_DEBUG ("interrupt uninstall tid %p previous_token %p interrupted %s\n",
1561 mono_thread_info_get_tid (info), previous_token, *interrupted ? "TRUE" : "FALSE");
1564 static MonoThreadInfoInterruptToken*
1565 set_interrupt_state (MonoThreadInfo *info)
1567 MonoThreadInfoInterruptToken *token, *previous_token;
1571 /* Atomically obtain the token the thread is
1572 * waiting on, and change it to a flag value. */
1575 previous_token = info->interrupt_token;
1577 /* Already interrupted */
1578 if (previous_token == INTERRUPT_STATE) {
1583 token = previous_token;
1584 } while (InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, INTERRUPT_STATE, previous_token) != previous_token);
1590 * mono_thread_info_prepare_interrupt:
1592 * The state of the thread info interrupt token is set to 'interrupted' which means that :
1593 * - if the thread calls one of the WaitFor functions, the function will return with
1594 * WAIT_IO_COMPLETION instead of waiting
1595 * - if the thread was waiting when this function was called, the wait will be broken
1597 * It is possible that the wait functions return WAIT_IO_COMPLETION, but the target thread
1598 * didn't receive the interrupt signal yet, in this case it should call the wait function
1599 * again. This essentially means that the target thread will busy wait until it is ready to
1600 * process the interruption.
1602 MonoThreadInfoInterruptToken*
1603 mono_thread_info_prepare_interrupt (MonoThreadInfo *info)
1605 MonoThreadInfoInterruptToken *token;
1607 token = set_interrupt_state (info);
1609 THREADS_INTERRUPT_DEBUG ("interrupt prepare tid %p token %p\n",
1610 mono_thread_info_get_tid (info), token);
1616 mono_thread_info_finish_interrupt (MonoThreadInfoInterruptToken *token)
1618 THREADS_INTERRUPT_DEBUG ("interrupt finish token %p\n", token);
1623 g_assert (token->callback);
1625 token->callback (token->data);
1631 mono_thread_info_self_interrupt (void)
1633 MonoThreadInfo *info;
1634 MonoThreadInfoInterruptToken *token;
1636 info = mono_thread_info_current ();
1639 token = set_interrupt_state (info);
1642 THREADS_INTERRUPT_DEBUG ("interrupt self tid %p\n",
1643 mono_thread_info_get_tid (info));
1646 /* Clear the interrupted flag of the current thread, set with
1647 * mono_thread_info_self_interrupt, so it can wait again */
1649 mono_thread_info_clear_self_interrupt ()
1651 MonoThreadInfo *info;
1652 MonoThreadInfoInterruptToken *previous_token;
1654 info = mono_thread_info_current ();
1657 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, NULL, INTERRUPT_STATE);
1658 g_assert (previous_token == NULL || previous_token == INTERRUPT_STATE);
1660 THREADS_INTERRUPT_DEBUG ("interrupt clear self tid %p previous_token %p\n", mono_thread_info_get_tid (info), previous_token);
1664 mono_thread_info_is_interrupt_state (MonoThreadInfo *info)
1667 return InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE;
1671 mono_thread_info_describe_interrupt_token (MonoThreadInfo *info, GString *text)
1675 if (!InterlockedReadPointer ((gpointer*) &info->interrupt_token))
1676 g_string_append_printf (text, "not waiting");
1677 else if (InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE)
1678 g_string_append_printf (text, "interrupted state");
1680 g_string_append_printf (text, "waiting");
1684 mono_thread_info_is_current (MonoThreadInfo *info)
1686 return mono_thread_info_get_tid (info) == mono_native_thread_id_get ();
1689 MonoThreadInfoWaitRet
1690 mono_thread_info_wait_one_handle (MonoThreadHandle *thread_handle, guint32 timeout, gboolean alertable)
1692 MonoOSEventWaitRet res;
1694 res = mono_os_event_wait_one (&thread_handle->event, timeout);
1695 if (res == MONO_OS_EVENT_WAIT_RET_SUCCESS_0)
1696 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0;
1697 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1698 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1699 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1700 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1702 g_error ("%s: unknown res value %d", __func__, res);
1705 MonoThreadInfoWaitRet
1706 mono_thread_info_wait_multiple_handle (MonoThreadHandle **thread_handles, gsize nhandles, MonoOSEvent *background_change_event, gboolean waitall, guint32 timeout, gboolean alertable)
1708 MonoOSEventWaitRet res;
1709 MonoOSEvent *thread_events [MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS];
1712 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS);
1713 if (background_change_event)
1714 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS - 1);
1716 for (i = 0; i < nhandles; ++i)
1717 thread_events [i] = &thread_handles [i]->event;
1719 if (background_change_event)
1720 thread_events [nhandles ++] = background_change_event;
1722 res = mono_os_event_wait_multiple (thread_events, nhandles, waitall, timeout);
1723 if (res >= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 && res <= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 + nhandles - 1)
1724 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0 + (res - MONO_OS_EVENT_WAIT_RET_SUCCESS_0);
1725 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1726 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1727 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1728 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1730 g_error ("%s: unknown res value %d", __func__, res);