2 * metadata/gc.c: GC icalls.
4 * Author: Paolo Molaro <lupus@ximian.com>
6 * (C) 2002 Ximian, Inc.
13 #include <mono/metadata/gc-internal.h>
14 #include <mono/metadata/mono-gc.h>
15 #include <mono/metadata/threads.h>
16 #include <mono/metadata/tabledefs.h>
17 #include <mono/metadata/exception.h>
18 #include <mono/metadata/profiler-private.h>
19 #include <mono/metadata/domain-internals.h>
20 #include <mono/metadata/class-internals.h>
21 #include <mono/utils/mono-logger.h>
22 #include <mono/os/gc_wrapper.h>
23 #include <mono/metadata/marshal.h> /* for mono_delegate_free_ftnptr () */
25 typedef struct DomainFinalizationReq {
28 } DomainFinalizationReq;
30 #ifdef PLATFORM_WINCE /* FIXME: add accessors to gc.dll API */
31 extern void (*__imp_GC_finalizer_notifier)(void);
32 #define GC_finalizer_notifier __imp_GC_finalizer_notifier
33 extern int __imp_GC_finalize_on_demand;
34 #define GC_finalize_on_demand __imp_GC_finalize_on_demand
37 static gboolean gc_disabled = FALSE;
39 #define mono_finalizer_lock() EnterCriticalSection (&finalizer_mutex)
40 #define mono_finalizer_unlock() LeaveCriticalSection (&finalizer_mutex)
41 static CRITICAL_SECTION finalizer_mutex;
43 static GSList *domains_to_finalize= NULL;
45 static MonoThread *gc_thread;
47 static void object_register_finalizer (MonoObject *obj, void (*callback)(void *, void*));
50 static HANDLE pending_done_event;
51 static HANDLE shutdown_event;
52 static HANDLE thread_started_event;
56 * actually, we might want to queue the finalize requests in a separate thread,
57 * but we need to be careful about the execution domain of the thread...
60 run_finalize (void *obj, void *data)
62 MonoObject *exc = NULL;
64 o = (MonoObject*)((char*)obj + GPOINTER_TO_UINT (data));
67 mono_domain_lock (o->vtable->domain);
69 o2 = g_hash_table_lookup (o->vtable->domain->finalizable_objects_hash, o);
71 mono_domain_unlock (o->vtable->domain);
74 /* Already finalized somehow */
78 /* make sure the finalizer is not called again if the object is resurrected */
79 object_register_finalizer (obj, NULL);
81 if (o->vtable->klass == mono_get_thread_class ())
82 if (mono_gc_is_finalizer_thread ((MonoThread*)o))
83 /* Avoid finalizing ourselves */
86 /* speedup later... and use a timeout */
87 /* g_print ("Finalize run on %p %s.%s\n", o, mono_object_class (o)->name_space, mono_object_class (o)->name); */
89 /* Use _internal here, since this thread can enter a doomed appdomain */
90 mono_domain_set_internal (mono_object_domain (o));
92 /* delegates that have a native function pointer allocated are
93 * registered for finalization, but they don't have a Finalize
94 * method, because in most cases it's not needed and it's just a waste.
96 if (o->vtable->klass->delegate) {
97 MonoDelegate* del = (MonoDelegate*)o;
98 if (del->delegate_trampoline)
99 mono_delegate_free_ftnptr ((MonoDelegate*)o);
103 mono_runtime_invoke (mono_class_get_finalizer (o->vtable->klass), o, NULL, &exc);
106 /* fixme: do something useful */
111 mono_gc_out_of_memory (size_t size)
114 * we could allocate at program startup some memory that we could release
115 * back to the system at this point if we're really low on memory (ie, size is
116 * lower than the memory we set apart)
118 mono_raise_exception (mono_domain_get ()->out_of_memory_ex);
124 * Some of our objects may point to a different address than the address returned by GC_malloc()
125 * (because of the GetHashCode hack), but we need to pass the real address to register_finalizer.
126 * This also means that in the callback we need to adjust the pointer to get back the real
128 * We also need to be consistent in the use of the GC_debug* variants of malloc and register_finalizer,
129 * since that, too, can cause the underlying pointer to be offset.
132 object_register_finalizer (MonoObject *obj, void (*callback)(void *, void*))
138 /* This assertion is not valid when GC_DEBUG is defined */
139 g_assert (GC_base (obj) == (char*)obj - offset);
142 if (mono_domain_is_unloading (obj->vtable->domain) && (callback != NULL))
144 * Can't register finalizers in a dying appdomain, since they
145 * could be invoked after the appdomain has been unloaded.
149 mono_domain_lock (obj->vtable->domain);
152 g_hash_table_insert (obj->vtable->domain->finalizable_objects_hash, obj,
155 g_hash_table_remove (obj->vtable->domain->finalizable_objects_hash, obj);
157 mono_domain_unlock (obj->vtable->domain);
159 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, callback, GUINT_TO_POINTER (offset), NULL, NULL);
160 #elif defined(HAVE_SGEN_GC)
161 mono_gc_register_for_finalization (obj, callback);
166 * mono_object_register_finalizer:
167 * @obj: object to register
169 * Records that object @obj has a finalizer, this will call the
170 * Finalize method when the garbage collector disposes the object.
174 mono_object_register_finalizer (MonoObject *obj)
176 /* g_print ("Registered finalizer on %p %s.%s\n", obj, mono_object_class (obj)->name_space, mono_object_class (obj)->name); */
177 object_register_finalizer (obj, run_finalize);
181 * mono_domain_finalize:
182 * @domain: the domain to finalize
183 * @timeout: msects to wait for the finalization to complete
185 * Request finalization of all finalizable objects inside @domain. Wait
186 * @timeout msecs for the finalization to complete.
188 * Returns: TRUE if succeeded, FALSE if there was a timeout
192 mono_domain_finalize (MonoDomain *domain, guint32 timeout)
194 DomainFinalizationReq *req;
198 if (mono_thread_current () == gc_thread)
199 /* We are called from inside a finalizer, not much we can do here */
202 mono_profiler_appdomain_event (domain, MONO_PROFILE_START_UNLOAD);
205 * No need to create another thread 'cause the finalizer thread
206 * is still working and will take care of running the finalizers
213 mono_gc_collect (mono_gc_max_generation ());
215 done_event = CreateEvent (NULL, TRUE, FALSE, NULL);
216 if (done_event == NULL) {
220 req = g_new0 (DomainFinalizationReq, 1);
221 req->domain = domain;
222 req->done_event = done_event;
224 mono_finalizer_lock ();
226 domains_to_finalize = g_slist_append (domains_to_finalize, req);
228 mono_finalizer_unlock ();
230 /* Tell the finalizer thread to finalize this appdomain */
231 mono_gc_finalize_notify ();
233 res = WaitForSingleObjectEx (done_event, timeout, TRUE);
235 /* printf ("WAIT RES: %d.\n", res); */
236 if (res == WAIT_TIMEOUT) {
237 /* We leak the handle here */
241 CloseHandle (done_event);
244 /* We don't support domain finalization without a GC */
250 ves_icall_System_GC_InternalCollect (int generation)
252 mono_gc_collect (generation);
256 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection)
261 mono_gc_collect (mono_gc_max_generation ());
262 return mono_gc_get_used_size ();
266 ves_icall_System_GC_KeepAlive (MonoObject *obj)
276 ves_icall_System_GC_ReRegisterForFinalize (MonoObject *obj)
280 object_register_finalizer (obj, run_finalize);
284 ves_icall_System_GC_SuppressFinalize (MonoObject *obj)
288 /* delegates have no finalizers, but we register them to deal with the
289 * unmanaged->managed trampoline. We don't let the user suppress it
290 * otherwise we'd leak it.
292 if (obj->vtable->klass->delegate)
295 object_register_finalizer (obj, NULL);
299 ves_icall_System_GC_WaitForPendingFinalizers (void)
304 if (!mono_gc_pending_finalizers ())
307 if (mono_thread_current () == gc_thread)
308 /* Avoid deadlocks */
311 ResetEvent (pending_done_event);
312 mono_gc_finalize_notify ();
313 /* g_print ("Waiting for pending finalizers....\n"); */
314 WaitForSingleObjectEx (pending_done_event, INFINITE, TRUE);
315 /* g_print ("Done pending....\n"); */
319 #define mono_allocator_lock() EnterCriticalSection (&allocator_section)
320 #define mono_allocator_unlock() LeaveCriticalSection (&allocator_section)
321 static CRITICAL_SECTION allocator_section;
322 static CRITICAL_SECTION handle_section;
331 static void mono_gchandle_set_target (guint32 gchandle, MonoObject *obj);
334 ves_icall_System_GCHandle_GetTarget (guint32 handle)
336 return mono_gchandle_get_target (handle);
340 * if type == -1, change the target of the handle, otherwise allocate a new handle.
343 ves_icall_System_GCHandle_GetTargetHandle (MonoObject *obj, guint32 handle, gint32 type)
346 mono_gchandle_set_target (handle, obj);
347 /* the handle doesn't change */
352 return mono_gchandle_new_weakref (obj, FALSE);
353 case HANDLE_WEAK_TRACK:
354 return mono_gchandle_new_weakref (obj, TRUE);
356 return mono_gchandle_new (obj, FALSE);
358 return mono_gchandle_new (obj, TRUE);
360 g_assert_not_reached ();
366 ves_icall_System_GCHandle_FreeHandle (guint32 handle)
368 mono_gchandle_free (handle);
372 ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle)
376 obj = mono_gchandle_get_target (handle);
378 MonoClass *klass = mono_object_class (obj);
379 if (klass == mono_defaults.string_class) {
380 return mono_string_chars ((MonoString*)obj);
381 } else if (klass->rank) {
382 return mono_array_addr ((MonoArray*)obj, char, 0);
384 /* the C# code will check and throw the exception */
385 /* FIXME: missing !klass->blittable test, see bug #61134 */
386 if ((klass->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_AUTO_LAYOUT)
388 return (char*)obj + sizeof (MonoObject);
399 guint slot_hint : 24; /* starting slot for search */
400 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
401 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
405 /* weak and weak-track arrays will be allocated in malloc memory
407 static HandleData gc_handles [] = {
408 {NULL, NULL, 0, HANDLE_WEAK, 0},
409 {NULL, NULL, 0, HANDLE_WEAK_TRACK, 0},
410 {NULL, NULL, 0, HANDLE_NORMAL, 0},
411 {NULL, NULL, 0, HANDLE_PINNED, 0}
414 #define lock_handles(handles) EnterCriticalSection (&handle_section)
415 #define unlock_handles(handles) LeaveCriticalSection (&handle_section)
418 find_first_unset (guint32 bitmap)
421 for (i = 0; i < 32; ++i) {
422 if (!(bitmap & (1 << i)))
429 alloc_handle (HandleData *handles, MonoObject *obj)
432 lock_handles (handles);
433 if (!handles->size) {
435 if (handles->type > HANDLE_WEAK_TRACK) {
436 handles->entries = mono_gc_alloc_fixed (sizeof (gpointer) * handles->size, NULL);
438 handles->entries = g_malloc0 (sizeof (gpointer) * handles->size);
439 handles->domain_ids = g_malloc0 (sizeof (guint16) * handles->size);
441 handles->bitmap = g_malloc0 (handles->size / 8);
444 for (slot = handles->slot_hint; slot < handles->size / 32; ++slot) {
445 if (handles->bitmap [slot] != 0xffffffff) {
446 i = find_first_unset (handles->bitmap [slot]);
447 handles->slot_hint = slot;
451 if (i == -1 && handles->slot_hint != 0) {
452 for (slot = 0; slot < handles->slot_hint; ++slot) {
453 if (handles->bitmap [slot] != 0xffffffff) {
454 i = find_first_unset (handles->bitmap [slot]);
455 handles->slot_hint = slot;
462 guint32 new_size = handles->size * 2; /* always double: we memset to 0 based on this below */
464 /* resize and copy the bitmap */
465 new_bitmap = g_malloc0 (new_size / 8);
466 memcpy (new_bitmap, handles->bitmap, handles->size / 8);
467 g_free (handles->bitmap);
468 handles->bitmap = new_bitmap;
470 /* resize and copy the entries */
471 if (handles->type > HANDLE_WEAK_TRACK) {
473 entries = mono_gc_alloc_fixed (sizeof (gpointer) * new_size, NULL);
474 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
475 handles->entries = entries;
479 domain_ids = g_malloc0 (sizeof (guint16) * new_size);
480 entries = g_malloc (sizeof (gpointer) * new_size);
481 /* we disable GC because we could lose some disappearing link updates */
483 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
484 memset (entries + handles->size, 0, sizeof (gpointer) * handles->size);
485 memcpy (domain_ids, handles->domain_ids, sizeof (guint16) * handles->size);
486 for (i = 0; i < handles->size; ++i) {
487 MonoObject *obj = mono_gc_weak_link_get (&(handles->entries [i]));
488 if (handles->entries [i])
489 mono_gc_weak_link_remove (&(handles->entries [i]));
490 /*g_print ("reg/unreg entry %d of type %d at %p to object %p (%p), was: %p\n", i, handles->type, &(entries [i]), obj, entries [i], handles->entries [i]);*/
492 mono_gc_weak_link_add (&(entries [i]), obj);
495 g_free (handles->entries);
496 g_free (handles->domain_ids);
497 handles->entries = entries;
498 handles->domain_ids = domain_ids;
502 /* set i and slot to the next free position */
504 slot = (handles->size + 1) / 32;
505 handles->slot_hint = handles->size + 1;
506 handles->size = new_size;
508 handles->bitmap [slot] |= 1 << i;
509 slot = slot * 32 + i;
510 handles->entries [slot] = obj;
511 if (handles->type <= HANDLE_WEAK_TRACK) {
513 mono_gc_weak_link_add (&(handles->entries [slot]), obj);
516 unlock_handles (handles);
517 /*g_print ("allocated entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
518 return (slot << 3) | (handles->type + 1);
523 * @obj: managed object to get a handle for
524 * @pinned: whether the object should be pinned
526 * This returns a handle that wraps the object, this is used to keep a
527 * reference to a managed object from the unmanaged world and preventing the
528 * object from being disposed.
530 * If @pinned is false the address of the object can not be obtained, if it is
531 * true the address of the object can be obtained. This will also pin the
532 * object so it will not be possible by a moving garbage collector to move the
535 * Returns: a handle that can be used to access the object from
539 mono_gchandle_new (MonoObject *obj, gboolean pinned)
541 return alloc_handle (&gc_handles [pinned? HANDLE_PINNED: HANDLE_NORMAL], obj);
545 * mono_gchandle_new_weakref:
546 * @obj: managed object to get a handle for
547 * @pinned: whether the object should be pinned
549 * This returns a weak handle that wraps the object, this is used to
550 * keep a reference to a managed object from the unmanaged world.
551 * Unlike the mono_gchandle_new the object can be reclaimed by the
552 * garbage collector. In this case the value of the GCHandle will be
555 * If @pinned is false the address of the object can not be obtained, if it is
556 * true the address of the object can be obtained. This will also pin the
557 * object so it will not be possible by a moving garbage collector to move the
560 * Returns: a handle that can be used to access the object from
564 mono_gchandle_new_weakref (MonoObject *obj, gboolean track_resurrection)
566 return alloc_handle (&gc_handles [track_resurrection? HANDLE_WEAK_TRACK: HANDLE_WEAK], obj);
570 * mono_gchandle_get_target:
571 * @gchandle: a GCHandle's handle.
573 * The handle was previously created by calling mono_gchandle_new or
574 * mono_gchandle_new_weakref.
576 * Returns a pointer to the MonoObject represented by the handle or
577 * NULL for a collected object if using a weakref handle.
580 mono_gchandle_get_target (guint32 gchandle)
582 guint slot = gchandle >> 3;
583 guint type = (gchandle & 7) - 1;
584 HandleData *handles = &gc_handles [type];
585 MonoObject *obj = NULL;
588 lock_handles (handles);
589 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
590 if (handles->type <= HANDLE_WEAK_TRACK) {
591 obj = mono_gc_weak_link_get (&handles->entries [slot]);
593 obj = handles->entries [slot];
596 /* print a warning? */
598 unlock_handles (handles);
599 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
604 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
606 guint slot = gchandle >> 3;
607 guint type = (gchandle & 7) - 1;
608 HandleData *handles = &gc_handles [type];
611 lock_handles (handles);
612 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
613 if (handles->type <= HANDLE_WEAK_TRACK) {
614 if (handles->entries [slot])
615 mono_gc_weak_link_remove (&handles->entries [slot]);
617 mono_gc_weak_link_add (&handles->entries [slot], obj);
619 handles->entries [slot] = obj;
622 /* print a warning? */
624 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
625 unlock_handles (handles);
629 * mono_gchandle_is_in_domain:
630 * @gchandle: a GCHandle's handle.
631 * @domain: An application domain.
633 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
636 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
638 guint slot = gchandle >> 3;
639 guint type = (gchandle & 7) - 1;
640 HandleData *handles = &gc_handles [type];
641 gboolean result = FALSE;
644 lock_handles (handles);
645 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
646 if (handles->type <= HANDLE_WEAK_TRACK) {
647 result = domain->domain_id == handles->domain_ids [slot];
650 obj = handles->entries [slot];
654 result = domain == mono_object_domain (obj);
657 /* print a warning? */
659 unlock_handles (handles);
664 * mono_gchandle_free:
665 * @gchandle: a GCHandle's handle.
667 * Frees the @gchandle handle. If there are no outstanding
668 * references, the garbage collector can reclaim the memory of the
672 mono_gchandle_free (guint32 gchandle)
674 guint slot = gchandle >> 3;
675 guint type = (gchandle & 7) - 1;
676 HandleData *handles = &gc_handles [type];
679 lock_handles (handles);
680 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
681 if (handles->type <= HANDLE_WEAK_TRACK) {
682 if (handles->entries [slot])
683 mono_gc_weak_link_remove (&handles->entries [slot]);
685 handles->entries [slot] = NULL;
687 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
689 /* print a warning? */
691 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
692 unlock_handles (handles);
696 * mono_gchandle_free_domain:
697 * @domain: domain that is unloading
699 * Function used internally to cleanup any GC handle for objects belonging
700 * to the specified domain during appdomain unload.
703 mono_gchandle_free_domain (MonoDomain *domain)
707 for (type = 0; type < 3; ++type) {
709 HandleData *handles = &gc_handles [type];
710 lock_handles (handles);
711 for (slot = 0; slot < handles->size; ++slot) {
712 if (!(handles->bitmap [slot / 32] & (1 << (slot % 32))))
714 if (type <= HANDLE_WEAK_TRACK) {
715 if (domain->domain_id == handles->domain_ids [slot]) {
716 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
717 if (handles->entries [slot])
718 mono_gc_weak_link_remove (&handles->entries [slot]);
721 if (handles->entries [slot] && mono_object_domain (handles->entries [slot]) == domain) {
722 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
723 handles->entries [slot] = NULL;
727 unlock_handles (handles);
734 static HANDLE finalizer_event;
735 static volatile gboolean finished=FALSE;
738 mono_gc_finalize_notify (void)
741 g_message (G_GNUC_PRETTY_FUNCTION ": prodding finalizer");
744 SetEvent (finalizer_event);
748 collect_objects (gpointer key, gpointer value, gpointer user_data)
750 GPtrArray *arr = (GPtrArray*)user_data;
751 g_ptr_array_add (arr, key);
755 * finalize_domain_objects:
757 * Run the finalizers of all finalizable objects in req->domain.
760 finalize_domain_objects (DomainFinalizationReq *req)
762 MonoDomain *domain = req->domain;
765 while (g_hash_table_size (domain->finalizable_objects_hash) > 0) {
769 * Since the domain is unloading, nobody is allowed to put
770 * new entries into the hash table. But finalize_object might
771 * remove entries from the hash table, so we make a copy.
773 objs = g_ptr_array_new ();
774 g_hash_table_foreach (domain->finalizable_objects_hash,
775 collect_objects, objs);
776 /* printf ("FINALIZING %d OBJECTS.\n", objs->len); */
778 for (i = 0; i < objs->len; ++i) {
779 MonoObject *o = (MonoObject*)g_ptr_array_index (objs, i);
780 /* FIXME: Avoid finalizing threads, etc */
784 g_ptr_array_free (objs, TRUE);
786 #elif defined(HAVE_SGEN_GC)
787 #define NUM_FOBJECTS 64
788 MonoObject *to_finalize [NUM_FOBJECTS];
790 while ((count = mono_gc_finalizers_for_domain (domain, to_finalize, NUM_FOBJECTS))) {
792 for (i = 0; i < count; ++i) {
793 run_finalize (to_finalize [i], 0);
798 /* Process finalizers which are already in the queue */
799 mono_gc_invoke_finalizers ();
801 /* printf ("DONE.\n"); */
802 SetEvent (req->done_event);
804 /* The event is closed in mono_domain_finalize if we get here */
808 static guint32 finalizer_thread (gpointer unused)
810 gc_thread = mono_thread_current ();
812 SetEvent (thread_started_event);
815 /* Wait to be notified that there's at least one
818 /* Use alertable=FALSE since we will be asked to exit using the event too */
819 WaitForSingleObjectEx (finalizer_event, INFINITE, FALSE);
821 if (domains_to_finalize) {
822 mono_finalizer_lock ();
823 if (domains_to_finalize) {
824 DomainFinalizationReq *req = domains_to_finalize->data;
825 domains_to_finalize = g_slist_remove (domains_to_finalize, req);
826 mono_finalizer_unlock ();
828 finalize_domain_objects (req);
831 mono_finalizer_unlock ();
835 g_message (G_GNUC_PRETTY_FUNCTION ": invoking finalizers");
838 /* If finished == TRUE, mono_gc_cleanup has been called (from mono_runtime_cleanup),
839 * before the domain is unloaded.
841 mono_gc_invoke_finalizers ();
843 SetEvent (pending_done_event);
846 SetEvent (shutdown_event);
851 * Enable or disable the separate finalizer thread.
852 * It's currently disabled because it still requires some
853 * work in the rest of the runtime.
855 #define ENABLE_FINALIZER_THREAD
860 InitializeCriticalSection (&handle_section);
861 InitializeCriticalSection (&allocator_section);
863 InitializeCriticalSection (&finalizer_mutex);
865 MONO_GC_REGISTER_ROOT (gc_handles [HANDLE_NORMAL].entries);
866 MONO_GC_REGISTER_ROOT (gc_handles [HANDLE_PINNED].entries);
868 mono_gc_base_init ();
870 #ifdef ENABLE_FINALIZER_THREAD
872 if (g_getenv ("GC_DONT_GC")) {
877 finalizer_event = CreateEvent (NULL, FALSE, FALSE, NULL);
878 pending_done_event = CreateEvent (NULL, TRUE, FALSE, NULL);
879 shutdown_event = CreateEvent (NULL, TRUE, FALSE, NULL);
880 thread_started_event = CreateEvent (NULL, TRUE, FALSE, NULL);
881 if (finalizer_event == NULL || pending_done_event == NULL || shutdown_event == NULL || thread_started_event == NULL) {
882 g_assert_not_reached ();
885 mono_thread_create (mono_domain_get (), finalizer_thread, NULL);
887 * Wait until the finalizer thread sets gc_thread since its value is needed
888 * by mono_thread_attach ()
890 WaitForSingleObjectEx (thread_started_event, INFINITE, FALSE);
894 void mono_gc_cleanup (void)
897 g_message (G_GNUC_PRETTY_FUNCTION ": cleaning up finalizer");
900 #ifdef ENABLE_FINALIZER_THREAD
902 ResetEvent (shutdown_event);
904 if (mono_thread_current () != gc_thread) {
905 mono_gc_finalize_notify ();
906 /* Finishing the finalizer thread, so wait a little bit... */
907 /* MS seems to wait for about 2 seconds */
908 if (WaitForSingleObjectEx (shutdown_event, 2000, FALSE) == WAIT_TIMEOUT) {
909 mono_thread_stop (gc_thread);
914 GC_finalizer_notifier = NULL;
920 DeleteCriticalSection (&handle_section);
921 DeleteCriticalSection (&allocator_section);
922 DeleteCriticalSection (&finalizer_mutex);
927 /* no Boehm GC support. */
928 void mono_gc_init (void)
930 InitializeCriticalSection (&handle_section);
933 void mono_gc_cleanup (void)
940 * mono_gc_is_finalizer_thread:
941 * @thread: the thread to test.
943 * In Mono objects are finalized asynchronously on a separate thread.
944 * This routine tests whether the @thread argument represents the
945 * finalization thread.
947 * Returns true if @thread is the finalization thread.
950 mono_gc_is_finalizer_thread (MonoThread *thread)
952 return thread == gc_thread;