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>
35 #include <mono/io-layer/io-layer.h>
40 #include <mono/utils/mach-support.h>
44 Mutex that makes sure only a single thread can be suspending others.
45 Suspend is a very racy operation since it requires restarting until
46 the target thread is not on an unsafe region.
48 We could implement this using critical regions, but would be much much
49 harder for an operation that is hardly performance critical.
51 The GC has to acquire this lock before starting a STW to make sure
52 a runtime suspend won't make it wronly see a thread in a safepoint
53 when it is in fact not.
55 This has to be a naked locking primitive, and not a coop aware one, as
56 it needs to be usable when destroying thread_info_key, the TLS key for
57 the current MonoThreadInfo. In this case, mono_thread_info_current_unchecked,
58 (which is used inside MONO_ENTER_GC_SAFE), would return NULL, leading
59 to an assertion error. We then simply switch state manually in
60 mono_thread_info_suspend_lock_with_info.
62 static MonoSemType global_suspend_semaphore;
64 static size_t thread_info_size;
65 static MonoThreadInfoCallbacks threads_callbacks;
66 static MonoThreadInfoRuntimeCallbacks runtime_callbacks;
67 static MonoNativeTlsKey thread_info_key, thread_exited_key;
69 static __thread guint32 tls_small_id MONO_TLS_FAST;
71 static MonoNativeTlsKey small_id_key;
73 static MonoLinkedListSet thread_list;
74 static gboolean mono_threads_inited = FALSE;
76 static MonoSemType suspend_semaphore;
77 static size_t pending_suspends;
79 #define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & THREAD_STATE_MASK)
82 #define SLEEP_DURATION_BEFORE_WARNING (50)
84 #define SLEEP_DURATION_BEFORE_ABORT MONO_INFINITE_WAIT
86 static guint32 sleepWarnDuration = SLEEP_DURATION_BEFORE_WARNING,
87 sleepAbortDuration = SLEEP_DURATION_BEFORE_ABORT;
89 static int suspend_posts, resume_posts, abort_posts, waits_done, pending_ops;
92 mono_threads_notify_initiator_of_abort (MonoThreadInfo* info)
94 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-ABORT] %p\n", mono_thread_info_get_tid (info));
95 InterlockedIncrement (&abort_posts);
96 mono_os_sem_post (&suspend_semaphore);
100 mono_threads_notify_initiator_of_suspend (MonoThreadInfo* info)
102 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-SUSPEND] %p\n", mono_thread_info_get_tid (info));
103 InterlockedIncrement (&suspend_posts);
104 mono_os_sem_post (&suspend_semaphore);
108 mono_threads_notify_initiator_of_resume (MonoThreadInfo* info)
110 THREADS_SUSPEND_DEBUG ("[INITIATOR-NOTIFY-RESUME] %p\n", mono_thread_info_get_tid (info));
111 InterlockedIncrement (&resume_posts);
112 mono_os_sem_post (&suspend_semaphore);
116 begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
118 if (mono_threads_is_coop_enabled ()) {
119 /* There's nothing else to do after we async request the thread to suspend */
120 mono_threads_add_to_pending_operation_set (info);
124 return mono_threads_suspend_begin_async_suspend (info, interrupt_kernel);
128 check_async_suspend (MonoThreadInfo *info)
130 if (mono_threads_is_coop_enabled ()) {
131 /* Async suspend can't async fail on coop */
135 return mono_threads_suspend_check_suspend_result (info);
139 resume_async_suspended (MonoThreadInfo *info)
141 if (mono_threads_is_coop_enabled ())
142 g_assert_not_reached ();
144 g_assert (mono_threads_suspend_begin_async_resume (info));
148 resume_self_suspended (MonoThreadInfo* info)
150 THREADS_SUSPEND_DEBUG ("**BEGIN self-resume %p\n", mono_thread_info_get_tid (info));
151 mono_os_sem_post (&info->resume_semaphore);
155 mono_thread_info_wait_for_resume (MonoThreadInfo* info)
158 THREADS_SUSPEND_DEBUG ("**WAIT self-resume %p\n", mono_thread_info_get_tid (info));
159 res = mono_os_sem_wait (&info->resume_semaphore, MONO_SEM_FLAGS_NONE);
160 g_assert (res != -1);
164 resume_blocking_suspended (MonoThreadInfo* info)
166 THREADS_SUSPEND_DEBUG ("**BEGIN blocking-resume %p\n", mono_thread_info_get_tid (info));
167 mono_os_sem_post (&info->resume_semaphore);
171 mono_threads_add_to_pending_operation_set (MonoThreadInfo* info)
173 THREADS_SUSPEND_DEBUG ("added %p to pending suspend\n", mono_thread_info_get_tid (info));
175 InterlockedIncrement (&pending_ops);
179 mono_threads_begin_global_suspend (void)
181 size_t ps = pending_suspends;
182 if (G_UNLIKELY (ps != 0))
183 g_error ("pending_suspends = %d, but must be 0", ps);
184 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,
185 abort_posts, waits_done, pending_ops);
186 g_assert ((suspend_posts + resume_posts + abort_posts) == waits_done);
187 mono_threads_coop_begin_global_suspend ();
191 mono_threads_end_global_suspend (void)
193 size_t ps = pending_suspends;
194 if (G_UNLIKELY (ps != 0))
195 g_error ("pending_suspends = %d, but must be 0", ps);
196 THREADS_SUSPEND_DEBUG ("------ END GLOBAL OP sp %d rp %d ap %d wd %d po %d\n", suspend_posts, resume_posts,
197 abort_posts, waits_done, pending_ops);
198 g_assert ((suspend_posts + resume_posts + abort_posts) == waits_done);
199 mono_threads_coop_end_global_suspend ();
205 MonoThreadInfo *cur = mono_thread_info_current ();
207 MOSTLY_ASYNC_SAFE_PRINTF ("STATE CUE CARD: (? means a positive number, usually 1 or 2, * means any number)\n");
208 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x0\t- starting (GOOD, unless the thread is running managed code)\n");
209 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x1\t- running (BAD, unless it's the gc thread)\n");
210 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x2\t- detached (GOOD, unless the thread is running managed code)\n");
211 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?03\t- async suspended (GOOD)\n");
212 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?04\t- self suspended (GOOD)\n");
213 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?05\t- async suspend requested (BAD)\n");
214 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?06\t- self suspend requested (BAD)\n");
215 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x*07\t- blocking (GOOD)\n");
216 MOSTLY_ASYNC_SAFE_PRINTF ("\t0x?08\t- blocking with pending suspend (GOOD)\n");
218 FOREACH_THREAD_SAFE (info) {
220 char thread_name [256] = { 0 };
221 pthread_getname_np (mono_thread_info_get_tid (info), thread_name, 255);
223 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" : "" );
225 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" : "" );
227 } FOREACH_THREAD_SAFE_END
231 mono_threads_wait_pending_operations (void)
234 int c = pending_suspends;
236 /* Wait threads to park */
237 THREADS_SUSPEND_DEBUG ("[INITIATOR-WAIT-COUNT] %d\n", c);
238 if (pending_suspends) {
239 MonoStopwatch suspension_time;
240 mono_stopwatch_start (&suspension_time);
241 for (i = 0; i < pending_suspends; ++i) {
242 THREADS_SUSPEND_DEBUG ("[INITIATOR-WAIT-WAITING]\n");
243 InterlockedIncrement (&waits_done);
244 if (mono_os_sem_timedwait (&suspend_semaphore, sleepAbortDuration, MONO_SEM_FLAGS_NONE) == MONO_SEM_TIMEDWAIT_RET_SUCCESS)
246 mono_stopwatch_stop (&suspension_time);
250 MOSTLY_ASYNC_SAFE_PRINTF ("WAITING for %d threads, got %d suspended\n", (int)pending_suspends, i);
251 g_error ("suspend_thread suspend took %d ms, which is more than the allowed %d ms", (int)mono_stopwatch_elapsed_ms (&suspension_time), sleepAbortDuration);
253 mono_stopwatch_stop (&suspension_time);
254 THREADS_SUSPEND_DEBUG ("Suspending %d threads took %d ms.\n", (int)pending_suspends, (int)mono_stopwatch_elapsed_ms (&suspension_time));
258 pending_suspends = 0;
264 //Thread initialization code
267 mono_hazard_pointer_clear_all (MonoThreadHazardPointers *hp, int retain)
270 mono_hazard_pointer_clear (hp, 0);
272 mono_hazard_pointer_clear (hp, 1);
274 mono_hazard_pointer_clear (hp, 2);
278 If return non null Hazard Pointer 1 holds the return value.
281 mono_thread_info_lookup (MonoNativeThreadId id)
283 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
285 if (!mono_lls_find (&thread_list, hp, (uintptr_t)id)) {
286 mono_hazard_pointer_clear_all (hp, -1);
290 mono_hazard_pointer_clear_all (hp, 1);
291 return (MonoThreadInfo *) mono_hazard_pointer_get_val (hp, 1);
295 mono_thread_info_insert (MonoThreadInfo *info)
297 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
299 if (!mono_lls_insert (&thread_list, hp, (MonoLinkedListSetNode*)info)) {
300 mono_hazard_pointer_clear_all (hp, -1);
304 mono_hazard_pointer_clear_all (hp, -1);
309 mono_thread_info_remove (MonoThreadInfo *info)
311 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
314 THREADS_DEBUG ("removing info %p\n", info);
315 res = mono_lls_remove (&thread_list, hp, (MonoLinkedListSetNode*)info);
316 mono_hazard_pointer_clear_all (hp, -1);
321 free_thread_info (gpointer mem)
323 MonoThreadInfo *info = (MonoThreadInfo *) mem;
325 mono_os_sem_destroy (&info->resume_semaphore);
326 mono_threads_suspend_free (info);
332 mono_thread_info_register_small_id (void)
334 int small_id = mono_thread_small_id_alloc ();
335 #ifdef HAVE_KW_THREAD
336 tls_small_id = small_id;
338 mono_native_tls_set_value (small_id_key, GUINT_TO_POINTER (small_id + 1));
344 thread_handle_destroy (gpointer data)
346 MonoThreadHandle *thread_handle;
348 thread_handle = (MonoThreadHandle*) data;
350 mono_os_event_destroy (&thread_handle->event);
351 g_free (thread_handle);
355 register_thread (MonoThreadInfo *info, gpointer baseptr)
358 guint8 *staddr = NULL;
359 int small_id = mono_thread_info_register_small_id ();
361 mono_thread_info_set_tid (info, mono_native_thread_id_get ());
362 info->small_id = small_id;
364 info->handle = g_new0 (MonoThreadHandle, 1);
365 mono_refcount_init (info->handle, thread_handle_destroy);
366 mono_os_event_init (&info->handle->event, FALSE);
368 mono_os_sem_init (&info->resume_semaphore, 0);
370 /*set TLS early so SMR works */
371 mono_native_tls_set_value (thread_info_key, info);
373 THREADS_DEBUG ("registering info %p tid %p small id %x\n", info, mono_thread_info_get_tid (info), info->small_id);
375 if (threads_callbacks.thread_register) {
376 if (threads_callbacks.thread_register (info, baseptr) == NULL) {
377 // g_warning ("thread registation failed\n");
378 mono_native_tls_set_value (thread_info_key, NULL);
384 mono_thread_info_get_stack_bounds (&staddr, &stsize);
387 info->stack_start_limit = staddr;
388 info->stack_end = staddr + stsize;
390 info->stackdata = g_byte_array_new ();
392 mono_threads_suspend_register (info);
395 Transition it before taking any locks or publishing itself to reduce the chance
396 of others witnessing a detached thread.
397 We can reasonably expect that until this thread gets published, no other thread will
398 try to manipulate it.
400 mono_threads_transition_attach (info);
401 mono_thread_info_suspend_lock ();
402 /*If this fail it means a given thread has been registered twice, which doesn't make sense. */
403 result = mono_thread_info_insert (info);
405 mono_thread_info_suspend_unlock ();
410 mono_thread_info_suspend_lock_with_info (MonoThreadInfo *info);
413 mono_threads_signal_thread_handle (MonoThreadHandle* thread_handle);
416 unregister_thread (void *arg)
418 gpointer gc_unsafe_stackdata;
419 MonoThreadInfo *info;
424 info = (MonoThreadInfo *) arg;
426 g_assert (mono_thread_info_is_current (info));
427 g_assert (mono_thread_info_is_live (info));
429 small_id = info->small_id;
431 /* We only enter the GC unsafe region, as when exiting this function, the thread
432 * will be detached, and the current MonoThreadInfo* will be destroyed. */
433 mono_threads_enter_gc_unsafe_region_unbalanced_with_info (info, &gc_unsafe_stackdata);
435 THREADS_DEBUG ("unregistering info %p\n", info);
437 mono_native_tls_set_value (thread_exited_key, GUINT_TO_POINTER (1));
440 * TLS destruction order is not reliable so small_id might be cleaned up
443 #ifndef HAVE_KW_THREAD
444 mono_native_tls_set_value (small_id_key, GUINT_TO_POINTER (info->small_id + 1));
447 /* we need to duplicate it, as the info->handle is going
448 * to be closed when unregistering from the platform */
449 handle = mono_threads_open_thread_handle (info->handle);
452 First perform the callback that requires no locks.
453 This callback has the potential of taking other locks, so we do it before.
454 After it completes, the thread remains functional.
456 if (threads_callbacks.thread_detach)
457 threads_callbacks.thread_detach (info);
459 mono_thread_info_suspend_lock_with_info (info);
462 Now perform the callback that must be done under locks.
463 This will render the thread useless and non-suspendable, so it must
464 be done while holding the suspend lock to give no other thread chance
467 if (threads_callbacks.thread_unregister)
468 threads_callbacks.thread_unregister (info);
470 /* The thread is no longer active, so unref its handle */
471 mono_threads_close_thread_handle (info->handle);
474 result = mono_thread_info_remove (info);
476 mono_threads_transition_detach (info);
478 mono_thread_info_suspend_unlock ();
480 g_byte_array_free (info->stackdata, /*free_segment=*/TRUE);
482 /*now it's safe to free the thread info.*/
483 mono_thread_hazardous_try_free (info, free_thread_info);
484 /* Pump the HP queue */
485 mono_thread_hazardous_try_free_some ();
487 mono_thread_small_id_free (small_id);
489 mono_threads_signal_thread_handle (handle);
491 mono_threads_close_thread_handle (handle);
495 thread_exited_dtor (void *arg)
497 #if defined(__MACH__)
499 * Since we use pthread dtors to clean up thread data, if a thread
500 * is attached to the runtime by another pthread dtor after our dtor
501 * has ran, it will never be detached, leading to various problems
502 * since the thread ids etc. will be reused while they are still in
503 * the threads hashtables etc.
504 * Dtors are called in a loop until all user tls entries are 0,
505 * but the loop has a maximum count (4), so if we set the tls
506 * variable every time, it will remain set when system tls dtors
507 * are ran. This allows mono_thread_info_is_exiting () to detect
508 * whenever the thread is exiting, even if it is executed from a
509 * system tls dtor (i.e. obj-c dealloc methods).
511 mono_native_tls_set_value (thread_exited_key, GUINT_TO_POINTER (1));
516 mono_thread_info_current_unchecked (void)
518 return mono_threads_inited ? (MonoThreadInfo*)mono_native_tls_get_value (thread_info_key) : NULL;
523 mono_thread_info_current (void)
525 MonoThreadInfo *info = (MonoThreadInfo*)mono_native_tls_get_value (thread_info_key);
529 info = mono_thread_info_lookup (mono_native_thread_id_get ()); /*info on HP1*/
532 We might be called during thread cleanup, but we cannot be called after cleanup as happened.
533 The way to distinguish between before, during and after cleanup is the following:
535 -If the TLS key is set, cleanup has not begun;
536 -If the TLS key is clean, but the thread remains registered, cleanup is in progress;
537 -If the thread is nowhere to be found, cleanup has finished.
539 We cannot function after cleanup since there's no way to ensure what will happen.
543 /*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 */
544 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
550 mono_thread_info_get_small_id (void)
552 #ifdef HAVE_KW_THREAD
555 gpointer val = mono_native_tls_get_value (small_id_key);
558 return GPOINTER_TO_INT (val) - 1;
563 mono_thread_info_list_head (void)
569 * mono_threads_attach_tools_thread
571 * Attach the current thread as a tool thread. DON'T USE THIS FUNCTION WITHOUT READING ALL DISCLAIMERS.
573 * A tools thread is a very special kind of thread that needs access to core runtime facilities but should
574 * not be counted as a regular thread for high order facilities such as executing managed code or accessing
577 * This is intended only to tools such as a profiler than needs to be able to use our lock-free support when
578 * doing things like resolving backtraces in their background processing thread.
581 mono_threads_attach_tools_thread (void)
584 MonoThreadInfo *info;
586 /* Must only be called once */
587 g_assert (!mono_native_tls_get_value (thread_info_key));
589 while (!mono_threads_inited) {
590 mono_thread_info_usleep (10);
593 info = mono_thread_info_attach (&dummy);
596 info->tools_thread = TRUE;
600 mono_thread_info_attach (void *baseptr)
602 MonoThreadInfo *info;
603 if (!mono_threads_inited)
606 /* This can happen from DllMain(DLL_THREAD_ATTACH) on Windows, if a
607 * thread is created before an embedding API user initialized Mono. */
608 THREADS_DEBUG ("mono_thread_info_attach called before mono_threads_init\n");
611 g_assert (mono_threads_inited);
614 info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
616 info = (MonoThreadInfo *) g_malloc0 (thread_info_size);
617 THREADS_DEBUG ("attaching %p\n", info);
618 if (!register_thread (info, baseptr))
620 } else if (threads_callbacks.thread_attach) {
621 threads_callbacks.thread_attach (info);
627 mono_thread_info_detach (void)
629 MonoThreadInfo *info;
630 if (!mono_threads_inited)
632 /* This can happen from DllMain(THREAD_DETACH) on Windows, if a thread
633 * is created before an embedding API user initialized Mono. */
634 THREADS_DEBUG ("mono_thread_info_detach called before mono_threads_init\n");
637 info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
639 THREADS_DEBUG ("detaching %p\n", info);
640 unregister_thread (info);
641 mono_native_tls_set_value (thread_info_key, NULL);
646 * mono_thread_info_is_exiting:
648 * Return whenever the current thread is exiting, i.e. it is running pthread
652 mono_thread_info_is_exiting (void)
654 #if defined(__MACH__)
655 if (mono_native_tls_get_value (thread_exited_key) == GUINT_TO_POINTER (1))
663 thread_info_key_dtor (void *arg)
665 /* Put the MonoThreadInfo back for the duration of the
666 * unregister code. In some circumstances the thread needs to
667 * take the GC lock which may block which requires a coop
668 * state transition. */
669 mono_native_tls_set_value (thread_info_key, arg);
670 unregister_thread (arg);
671 mono_native_tls_set_value (thread_info_key, NULL);
676 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t info_size)
679 threads_callbacks = *callbacks;
680 thread_info_size = info_size;
681 const char *sleepLimit;
683 res = mono_native_tls_alloc (&thread_info_key, NULL);
684 res = mono_native_tls_alloc (&thread_exited_key, NULL);
686 res = mono_native_tls_alloc (&thread_info_key, (void *) thread_info_key_dtor);
687 res = mono_native_tls_alloc (&thread_exited_key, (void *) thread_exited_dtor);
692 #ifndef HAVE_KW_THREAD
693 res = mono_native_tls_alloc (&small_id_key, NULL);
697 if ((sleepLimit = g_getenv ("MONO_SLEEP_ABORT_LIMIT")) != NULL) {
699 long threshold = strtol(sleepLimit, NULL, 10);
700 if ((errno == 0) && (threshold >= 40)) {
701 sleepAbortDuration = threshold;
702 sleepWarnDuration = threshold / 20;
704 g_warning("MONO_SLEEP_ABORT_LIMIT must be a number >= 40");
707 mono_os_sem_init (&global_suspend_semaphore, 1);
708 mono_os_sem_init (&suspend_semaphore, 0);
710 mono_lls_init (&thread_list, NULL);
711 mono_thread_smr_init ();
712 mono_threads_suspend_init ();
713 mono_threads_suspend_init_signals ();
714 mono_threads_coop_init ();
716 #if defined(__MACH__)
717 mono_mach_init (thread_info_key);
720 mono_threads_inited = TRUE;
722 g_assert (sizeof (MonoNativeThreadId) <= sizeof (uintptr_t));
726 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks)
728 runtime_callbacks = *callbacks;
731 MonoThreadInfoRuntimeCallbacks *
732 mono_threads_get_runtime_callbacks (void)
734 return &runtime_callbacks;
738 mono_thread_info_core_resume (MonoThreadInfo *info)
740 gboolean res = FALSE;
742 switch (mono_threads_transition_request_resume (info)) {
749 case ResumeInitSelfResume:
750 resume_self_suspended (info);
753 case ResumeInitAsyncResume:
754 resume_async_suspended (info);
757 case ResumeInitBlockingResume:
758 resume_blocking_suspended (info);
767 mono_thread_info_resume (MonoNativeThreadId tid)
769 gboolean result; /* don't initialize it so the compiler can catch unitilized paths. */
770 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
771 MonoThreadInfo *info;
773 THREADS_SUSPEND_DEBUG ("RESUMING tid %p\n", (void*)tid);
775 mono_thread_info_suspend_lock ();
777 info = mono_thread_info_lookup (tid); /*info on HP1*/
783 result = mono_thread_info_core_resume (info);
785 //Wait for the pending resume to finish
786 mono_threads_wait_pending_operations ();
789 mono_thread_info_suspend_unlock ();
790 mono_hazard_pointer_clear (hp, 1);
795 mono_thread_info_begin_suspend (MonoThreadInfo *info)
797 switch (mono_threads_transition_request_async_suspension (info)) {
798 case AsyncSuspendAlreadySuspended:
799 case AsyncSuspendBlocking:
801 case AsyncSuspendWait:
802 mono_threads_add_to_pending_operation_set (info);
804 case AsyncSuspendInitSuspend:
805 return begin_async_suspend (info, FALSE);
807 g_assert_not_reached ();
812 mono_thread_info_begin_resume (MonoThreadInfo *info)
814 return mono_thread_info_core_resume (info);
818 FIXME fix cardtable WB to be out of line and check with the runtime if the target is not the
819 WB trampoline. Another option is to encode wb ranges in MonoJitInfo, but that is somewhat hard.
822 is_thread_in_critical_region (MonoThreadInfo *info)
826 gpointer stack_start;
827 MonoThreadUnwindState *state;
829 /* Are we inside a system critical region? */
830 if (info->inside_critical_region)
833 /* Are we inside a GC critical region? */
834 if (threads_callbacks.mono_thread_in_critical_region && threads_callbacks.mono_thread_in_critical_region (info)) {
838 /* The target thread might be shutting down and the domain might be null, which means no managed code left to run. */
839 state = mono_thread_info_get_suspend_state (info);
840 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
843 stack_start = MONO_CONTEXT_GET_SP (&state->ctx);
844 /* altstack signal handler, sgen can't handle them, so we treat them as critical */
845 if (stack_start < info->stack_start_limit || stack_start >= info->stack_end)
848 if (threads_callbacks.ip_in_critical_region)
849 return threads_callbacks.ip_in_critical_region ((MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN], (char *) MONO_CONTEXT_GET_IP (&state->ctx));
851 ji = mono_jit_info_table_find (
852 (MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
853 (char *) MONO_CONTEXT_GET_IP (&state->ctx));
858 method = mono_jit_info_get_method (ji);
860 return threads_callbacks.mono_method_is_critical (method);
864 mono_thread_info_in_critical_location (MonoThreadInfo *info)
866 return is_thread_in_critical_region (info);
870 The return value is only valid until a matching mono_thread_info_resume is called
872 static MonoThreadInfo*
873 suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel)
875 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
876 MonoThreadInfo *info = mono_thread_info_lookup (tid); /*info on HP1*/
880 switch (mono_threads_transition_request_async_suspension (info)) {
881 case AsyncSuspendAlreadySuspended:
882 mono_hazard_pointer_clear (hp, 1); //XXX this is questionable we got to clean the suspend/resume nonsense of critical sections
884 case AsyncSuspendWait:
885 mono_threads_add_to_pending_operation_set (info);
887 case AsyncSuspendInitSuspend:
888 if (!begin_async_suspend (info, interrupt_kernel)) {
889 mono_hazard_pointer_clear (hp, 1);
893 case AsyncSuspendBlocking:
894 if (interrupt_kernel && mono_threads_suspend_needs_abort_syscall ())
895 mono_threads_suspend_abort_syscall (info);
899 g_assert_not_reached ();
902 //Wait for the pending suspend to finish
903 mono_threads_wait_pending_operations ();
905 if (!check_async_suspend (info)) {
906 mono_thread_info_core_resume (info);
907 mono_threads_wait_pending_operations ();
908 mono_hazard_pointer_clear (hp, 1);
914 static MonoThreadInfo*
915 suspend_sync_nolock (MonoNativeThreadId id, gboolean interrupt_kernel)
917 MonoThreadInfo *info = NULL;
918 int sleep_duration = 0;
920 if (!(info = suspend_sync (id, interrupt_kernel))) {
921 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
925 /*WARNING: We now are in interrupt context until we resume the thread. */
926 if (!is_thread_in_critical_region (info))
929 if (!mono_thread_info_core_resume (info)) {
930 mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
933 THREADS_SUSPEND_DEBUG ("RESTARTED thread tid %p\n", (void*)id);
935 /* Wait for the pending resume to finish */
936 mono_threads_wait_pending_operations ();
938 if (sleep_duration == 0)
939 mono_thread_info_yield ();
941 g_usleep (sleep_duration);
943 sleep_duration += 10;
949 mono_thread_info_safe_suspend_and_run (MonoNativeThreadId id, gboolean interrupt_kernel, MonoSuspendThreadCallback callback, gpointer user_data)
952 MonoThreadInfo *info = NULL;
953 MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
955 THREADS_SUSPEND_DEBUG ("SUSPENDING tid %p\n", (void*)id);
956 /*FIXME: unify this with self-suspend*/
957 g_assert (id != mono_native_thread_id_get ());
959 /* This can block during stw */
960 mono_thread_info_suspend_lock ();
961 mono_threads_begin_global_suspend ();
963 info = suspend_sync_nolock (id, interrupt_kernel);
967 switch (result = callback (info, user_data)) {
968 case MonoResumeThread:
969 mono_hazard_pointer_set (hp, 1, info);
970 mono_thread_info_core_resume (info);
971 mono_threads_wait_pending_operations ();
974 g_assert (!mono_threads_is_coop_enabled ());
977 g_error ("Invalid suspend_and_run callback return value %d", result);
981 mono_hazard_pointer_clear (hp, 1);
982 mono_threads_end_global_suspend ();
983 mono_thread_info_suspend_unlock ();
987 Inject an assynchronous call into the target thread. The target thread must be suspended and
988 only a single async call can be setup for a given suspend cycle.
989 This async call must cause stack unwinding as the current implementation doesn't save enough state
990 to resume execution of the top-of-stack function. It's an acceptable limitation since this is
991 currently used only to deliver exceptions.
994 mono_thread_info_setup_async_call (MonoThreadInfo *info, void (*target_func)(void*), void *user_data)
996 /* An async call can only be setup on an async suspended thread */
997 g_assert (mono_thread_info_run_state (info) == STATE_ASYNC_SUSPENDED);
998 /*FIXME this is a bad assert, we probably should do proper locking and fail if one is already set*/
999 g_assert (!info->async_target);
1000 info->async_target = target_func;
1001 /* This is not GC tracked */
1002 info->user_data = user_data;
1006 The suspend lock is held during any suspend in progress.
1007 A GC that has safepoints must take this lock as part of its
1008 STW to make sure no unsafe pending suspend is in progress.
1012 mono_thread_info_suspend_lock_with_info (MonoThreadInfo *info)
1015 g_assert (mono_thread_info_is_current (info));
1016 g_assert (mono_thread_info_is_live (info));
1018 MONO_ENTER_GC_SAFE_WITH_INFO(info);
1020 int res = mono_os_sem_wait (&global_suspend_semaphore, MONO_SEM_FLAGS_NONE);
1021 g_assert (res != -1);
1023 MONO_EXIT_GC_SAFE_WITH_INFO;
1027 mono_thread_info_suspend_lock (void)
1029 mono_thread_info_suspend_lock_with_info (mono_thread_info_current_unchecked ());
1033 mono_thread_info_suspend_unlock (void)
1035 mono_os_sem_post (&global_suspend_semaphore);
1039 * This is a very specific function whose only purpose is to
1040 * break a given thread from socket syscalls.
1042 * This only exists because linux won't fail a call to connect
1043 * if the underlying is closed.
1045 * TODO We should cleanup and unify this with the other syscall abort
1049 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid)
1051 MonoThreadHazardPointers *hp;
1052 MonoThreadInfo *info;
1054 if (tid == mono_native_thread_id_get () || !mono_threads_suspend_needs_abort_syscall ())
1057 hp = mono_hazard_pointer_get ();
1058 info = mono_thread_info_lookup (tid);
1062 if (mono_thread_info_run_state (info) == STATE_DETACHED) {
1063 mono_hazard_pointer_clear (hp, 1);
1067 mono_thread_info_suspend_lock ();
1068 mono_threads_begin_global_suspend ();
1070 mono_threads_suspend_abort_syscall (info);
1071 mono_threads_wait_pending_operations ();
1073 mono_hazard_pointer_clear (hp, 1);
1075 mono_threads_end_global_suspend ();
1076 mono_thread_info_suspend_unlock ();
1080 * mono_thread_info_set_is_async_context:
1082 * Set whenever the current thread is in an async context. Some runtime functions might behave
1083 * differently while in an async context in order to be async safe.
1086 mono_thread_info_set_is_async_context (gboolean async_context)
1088 MonoThreadInfo *info = mono_thread_info_current ();
1091 info->is_async_context = async_context;
1095 mono_thread_info_is_async_context (void)
1097 MonoThreadInfo *info = mono_thread_info_current ();
1100 return info->is_async_context;
1107 MonoThreadStart start_routine;
1108 gpointer start_routine_arg;
1109 MonoCoopSem registered;
1110 MonoThreadHandle *handle;
1114 create_thread_data_destroy (gpointer data)
1116 CreateThreadData *thread_data;
1118 thread_data = (CreateThreadData*) data;
1120 mono_coop_sem_destroy (&thread_data->registered);
1121 g_free (thread_data);
1125 inner_start_thread (gpointer data)
1127 CreateThreadData *thread_data;
1128 MonoThreadInfo *info;
1129 MonoThreadStart start_routine;
1130 gpointer start_routine_arg;
1131 gsize start_routine_res;
1134 thread_data = (CreateThreadData*) data;
1135 g_assert (thread_data);
1137 start_routine = thread_data->start_routine;
1138 start_routine_arg = thread_data->start_routine_arg;
1140 info = mono_thread_info_attach (&dummy);
1141 info->runtime_thread = TRUE;
1143 thread_data->handle = mono_threads_open_thread_handle (info->handle);
1145 mono_coop_sem_post (&thread_data->registered);
1147 mono_refcount_dec (thread_data);
1149 /* thread_data is not valid anymore */
1152 /* Run the actual main function of the thread */
1153 start_routine_res = start_routine (start_routine_arg);
1155 mono_thread_info_exit (start_routine_res);
1157 g_assert_not_reached ();
1161 * mono_threads_create_thread:
1163 * Create a new thread executing START with argument ARG. Store its id into OUT_TID.
1164 * Returns: a windows or io-layer handle for the thread.
1167 mono_threads_create_thread (MonoThreadStart start, gpointer arg, gsize * const stack_size, MonoNativeThreadId *out_tid)
1169 CreateThreadData *thread_data;
1171 MonoThreadHandle *ret;
1173 thread_data = g_new0 (CreateThreadData, 1);
1174 mono_refcount_init (thread_data, create_thread_data_destroy);
1175 thread_data->start_routine = start;
1176 thread_data->start_routine_arg = arg;
1177 mono_coop_sem_init (&thread_data->registered, 0);
1179 res = mono_threads_platform_create_thread (inner_start_thread, (gpointer) mono_refcount_inc (thread_data), stack_size, out_tid);
1181 /* ref is not going to be decremented in inner_start_thread */
1182 mono_refcount_dec (thread_data);
1187 res = mono_coop_sem_wait (&thread_data->registered, MONO_SEM_FLAGS_NONE);
1188 g_assert (res == 0);
1190 ret = thread_data->handle;
1194 mono_refcount_dec (thread_data);
1200 * mono_thread_info_get_stack_bounds:
1202 * Return the address and size of the current threads stack. Return NULL as the
1203 * stack address if the stack address cannot be determined.
1206 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize)
1208 guint8 *current = (guint8 *)&stsize;
1209 mono_threads_platform_get_stack_bounds (staddr, stsize);
1213 /* Sanity check the result */
1214 g_assert ((current > *staddr) && (current < *staddr + *stsize));
1216 /* When running under emacs, sometimes staddr is not aligned to a page size */
1217 *staddr = (guint8*)((gssize)*staddr & ~(mono_pagesize () - 1));
1221 mono_thread_info_yield (void)
1223 return mono_threads_platform_yield ();
1225 static mono_lazy_init_t sleep_init = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
1226 static MonoCoopMutex sleep_mutex;
1227 static MonoCoopCond sleep_cond;
1230 sleep_initialize (void)
1232 mono_coop_mutex_init (&sleep_mutex);
1233 mono_coop_cond_init (&sleep_cond);
1237 sleep_interrupt (gpointer data)
1239 mono_coop_mutex_lock (&sleep_mutex);
1240 mono_coop_cond_broadcast (&sleep_cond);
1241 mono_coop_mutex_unlock (&sleep_mutex);
1244 static inline guint32
1245 sleep_interruptable (guint32 ms, gboolean *alerted)
1249 g_assert (MONO_INFINITE_WAIT == G_MAXUINT32);
1254 if (ms != MONO_INFINITE_WAIT)
1255 end = mono_msec_ticks() + ms;
1257 mono_lazy_initialize (&sleep_init, sleep_initialize);
1259 mono_coop_mutex_lock (&sleep_mutex);
1262 if (ms != MONO_INFINITE_WAIT) {
1263 now = mono_msec_ticks();
1268 mono_thread_info_install_interrupt (sleep_interrupt, NULL, alerted);
1270 mono_coop_mutex_unlock (&sleep_mutex);
1271 return WAIT_IO_COMPLETION;
1274 if (ms != MONO_INFINITE_WAIT)
1275 mono_coop_cond_timedwait (&sleep_cond, &sleep_mutex, end - now);
1277 mono_coop_cond_wait (&sleep_cond, &sleep_mutex);
1279 mono_thread_info_uninstall_interrupt (alerted);
1281 mono_coop_mutex_unlock (&sleep_mutex);
1282 return WAIT_IO_COMPLETION;
1286 mono_coop_mutex_unlock (&sleep_mutex);
1292 mono_thread_info_sleep (guint32 ms, gboolean *alerted)
1295 MonoThreadInfo *info;
1297 mono_thread_info_yield ();
1299 info = mono_thread_info_current ();
1300 if (info && mono_thread_info_is_interrupt_state (info))
1301 return WAIT_IO_COMPLETION;
1307 return sleep_interruptable (ms, alerted);
1311 if (ms == MONO_INFINITE_WAIT) {
1314 Sleep (G_MAXUINT32);
1316 sleep (G_MAXUINT32);
1321 #if defined (__linux__) && !defined(PLATFORM_ANDROID)
1322 struct timespec start, target;
1324 /* Use clock_nanosleep () to prevent time drifting problems when nanosleep () is interrupted by signals */
1325 ret = clock_gettime (CLOCK_MONOTONIC, &start);
1326 g_assert (ret == 0);
1329 target.tv_sec += ms / 1000;
1330 target.tv_nsec += (ms % 1000) * 1000000;
1331 if (target.tv_nsec > 999999999) {
1332 target.tv_nsec -= 999999999;
1337 ret = clock_nanosleep (CLOCK_MONOTONIC, TIMER_ABSTIME, &target, NULL);
1342 struct timespec req, rem;
1344 req.tv_sec = ms / 1000;
1345 req.tv_nsec = (ms % 1000) * 1000000;
1348 memset (&rem, 0, sizeof (rem));
1349 ret = nanosleep (&req, &rem);
1351 #endif /* __linux__ */
1360 mono_thread_info_usleep (guint64 us)
1369 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key)
1371 return ((MonoThreadInfo*)info)->tls [key];
1375 * mono_threads_info_tls_set:
1377 * Set the TLS key to VALUE in the info structure. This can be used to obtain
1378 * values of TLS variables for threads other than the current thread.
1379 * This should only be used for infrequently changing TLS variables, and it should
1380 * be paired with setting the real TLS variable since this provides no GC tracking.
1383 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value)
1385 ((MonoThreadInfo*)info)->tls [key] = value;
1388 #if defined(__native_client__)
1389 void nacl_shutdown_gc_thread(void);
1393 * mono_thread_info_exit:
1395 * Exit the current thread.
1396 * This function doesn't return.
1399 mono_thread_info_exit (gsize exit_code)
1401 #if defined(__native_client__)
1402 nacl_shutdown_gc_thread();
1405 mono_thread_info_detach ();
1407 mono_threads_platform_exit (0);
1411 * mono_threads_open_thread_handle:
1413 * Duplicate the handle. The handle needs to be closed by calling
1414 * mono_threads_close_thread_handle () when it is no longer needed.
1417 mono_threads_open_thread_handle (MonoThreadHandle *thread_handle)
1419 return mono_refcount_inc (thread_handle);
1423 mono_threads_close_thread_handle (MonoThreadHandle *thread_handle)
1425 mono_refcount_dec (thread_handle);
1429 mono_threads_signal_thread_handle (MonoThreadHandle* thread_handle)
1431 mono_os_event_set (&thread_handle->event);
1434 #define INTERRUPT_STATE ((MonoThreadInfoInterruptToken*) (size_t) -1)
1436 struct _MonoThreadInfoInterruptToken {
1437 void (*callback) (gpointer data);
1442 * mono_thread_info_install_interrupt: install an interruption token for the current thread.
1444 * - @callback: must be able to be called from another thread and always cancel the wait
1445 * - @data: passed to the callback
1446 * - @interrupted: will be set to TRUE if a token is already installed, FALSE otherwise
1447 * if set to TRUE, it must mean that the thread is in interrupted state
1450 mono_thread_info_install_interrupt (void (*callback) (gpointer data), gpointer data, gboolean *interrupted)
1452 MonoThreadInfo *info;
1453 MonoThreadInfoInterruptToken *previous_token, *token;
1455 g_assert (callback);
1457 g_assert (interrupted);
1458 *interrupted = FALSE;
1460 info = mono_thread_info_current ();
1463 /* The memory of this token can be freed at 2 places:
1464 * - if the token is not interrupted: it will be freed in uninstall, as info->interrupt_token has not been replaced
1465 * by the INTERRUPT_STATE flag value, and it still contains the pointer to the memory location
1466 * - if the token is interrupted: it will be freed in finish, as the token is now owned by the prepare/finish
1467 * functions, and info->interrupt_token does not contains a pointer to the memory anymore */
1468 token = g_new0 (MonoThreadInfoInterruptToken, 1);
1469 token->callback = callback;
1472 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, token, NULL);
1474 if (previous_token) {
1475 if (previous_token != INTERRUPT_STATE)
1476 g_error ("mono_thread_info_install_interrupt: previous_token should be INTERRUPT_STATE (%p), but it was %p", INTERRUPT_STATE, previous_token);
1480 *interrupted = TRUE;
1483 THREADS_INTERRUPT_DEBUG ("interrupt install tid %p token %p previous_token %p interrupted %s\n",
1484 mono_thread_info_get_tid (info), token, previous_token, *interrupted ? "TRUE" : "FALSE");
1488 mono_thread_info_uninstall_interrupt (gboolean *interrupted)
1490 MonoThreadInfo *info;
1491 MonoThreadInfoInterruptToken *previous_token;
1493 g_assert (interrupted);
1494 *interrupted = FALSE;
1496 info = mono_thread_info_current ();
1499 previous_token = (MonoThreadInfoInterruptToken *)InterlockedExchangePointer ((gpointer*) &info->interrupt_token, NULL);
1501 /* only the installer can uninstall the token */
1502 g_assert (previous_token);
1504 if (previous_token == INTERRUPT_STATE) {
1505 /* if it is interrupted, then it is going to be freed in finish interrupt */
1506 *interrupted = TRUE;
1508 g_free (previous_token);
1511 THREADS_INTERRUPT_DEBUG ("interrupt uninstall tid %p previous_token %p interrupted %s\n",
1512 mono_thread_info_get_tid (info), previous_token, *interrupted ? "TRUE" : "FALSE");
1515 static MonoThreadInfoInterruptToken*
1516 set_interrupt_state (MonoThreadInfo *info)
1518 MonoThreadInfoInterruptToken *token, *previous_token;
1522 /* Atomically obtain the token the thread is
1523 * waiting on, and change it to a flag value. */
1526 previous_token = info->interrupt_token;
1528 /* Already interrupted */
1529 if (previous_token == INTERRUPT_STATE) {
1534 token = previous_token;
1535 } while (InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, INTERRUPT_STATE, previous_token) != previous_token);
1541 * mono_thread_info_prepare_interrupt:
1543 * The state of the thread info interrupt token is set to 'interrupted' which means that :
1544 * - if the thread calls one of the WaitFor functions, the function will return with
1545 * WAIT_IO_COMPLETION instead of waiting
1546 * - if the thread was waiting when this function was called, the wait will be broken
1548 * It is possible that the wait functions return WAIT_IO_COMPLETION, but the target thread
1549 * didn't receive the interrupt signal yet, in this case it should call the wait function
1550 * again. This essentially means that the target thread will busy wait until it is ready to
1551 * process the interruption.
1553 MonoThreadInfoInterruptToken*
1554 mono_thread_info_prepare_interrupt (MonoThreadInfo *info)
1556 MonoThreadInfoInterruptToken *token;
1558 token = set_interrupt_state (info);
1560 THREADS_INTERRUPT_DEBUG ("interrupt prepare tid %p token %p\n",
1561 mono_thread_info_get_tid (info), token);
1567 mono_thread_info_finish_interrupt (MonoThreadInfoInterruptToken *token)
1569 THREADS_INTERRUPT_DEBUG ("interrupt finish token %p\n", token);
1574 g_assert (token->callback);
1576 token->callback (token->data);
1582 mono_thread_info_self_interrupt (void)
1584 MonoThreadInfo *info;
1585 MonoThreadInfoInterruptToken *token;
1587 info = mono_thread_info_current ();
1590 token = set_interrupt_state (info);
1593 THREADS_INTERRUPT_DEBUG ("interrupt self tid %p\n",
1594 mono_thread_info_get_tid (info));
1597 /* Clear the interrupted flag of the current thread, set with
1598 * mono_thread_info_self_interrupt, so it can wait again */
1600 mono_thread_info_clear_self_interrupt ()
1602 MonoThreadInfo *info;
1603 MonoThreadInfoInterruptToken *previous_token;
1605 info = mono_thread_info_current ();
1608 previous_token = (MonoThreadInfoInterruptToken *)InterlockedCompareExchangePointer ((gpointer*) &info->interrupt_token, NULL, INTERRUPT_STATE);
1609 g_assert (previous_token == NULL || previous_token == INTERRUPT_STATE);
1611 THREADS_INTERRUPT_DEBUG ("interrupt clear self tid %p previous_token %p\n", mono_thread_info_get_tid (info), previous_token);
1615 mono_thread_info_is_interrupt_state (MonoThreadInfo *info)
1618 return InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE;
1622 mono_thread_info_describe_interrupt_token (MonoThreadInfo *info, GString *text)
1626 if (!InterlockedReadPointer ((gpointer*) &info->interrupt_token))
1627 g_string_append_printf (text, "not waiting");
1628 else if (InterlockedReadPointer ((gpointer*) &info->interrupt_token) == INTERRUPT_STATE)
1629 g_string_append_printf (text, "interrupted state");
1631 g_string_append_printf (text, "waiting");
1635 mono_thread_info_is_current (MonoThreadInfo *info)
1637 return mono_thread_info_get_tid (info) == mono_native_thread_id_get ();
1640 MonoThreadInfoWaitRet
1641 mono_thread_info_wait_one_handle (MonoThreadHandle *thread_handle, guint32 timeout, gboolean alertable)
1643 MonoOSEventWaitRet res;
1645 res = mono_os_event_wait_one (&thread_handle->event, timeout);
1646 if (res == MONO_OS_EVENT_WAIT_RET_SUCCESS_0)
1647 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0;
1648 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1649 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1650 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1651 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1653 g_error ("%s: unknown res value %d", __func__, res);
1656 MonoThreadInfoWaitRet
1657 mono_thread_info_wait_multiple_handle (MonoThreadHandle **thread_handles, gsize nhandles, MonoOSEvent *background_change_event, gboolean waitall, guint32 timeout, gboolean alertable)
1659 MonoOSEventWaitRet res;
1660 MonoOSEvent *thread_events [MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS];
1663 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS);
1664 if (background_change_event)
1665 g_assert (nhandles <= MONO_OS_EVENT_WAIT_MAXIMUM_OBJECTS - 1);
1667 for (i = 0; i < nhandles; ++i)
1668 thread_events [i] = &thread_handles [i]->event;
1670 if (background_change_event)
1671 thread_events [nhandles ++] = background_change_event;
1673 res = mono_os_event_wait_multiple (thread_events, nhandles, waitall, timeout);
1674 if (res >= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 && res <= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 + nhandles - 1)
1675 return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0 + (res - MONO_OS_EVENT_WAIT_RET_SUCCESS_0);
1676 else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
1677 return MONO_THREAD_INFO_WAIT_RET_ALERTED;
1678 else if (res == MONO_OS_EVENT_WAIT_RET_TIMEOUT)
1679 return MONO_THREAD_INFO_WAIT_RET_TIMEOUT;
1681 g_error ("%s: unknown res value %d", __func__, res);