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);
217 req = g_new0 (DomainFinalizationReq, 1);
218 req->domain = domain;
219 req->done_event = done_event;
221 mono_finalizer_lock ();
223 domains_to_finalize = g_slist_append (domains_to_finalize, req);
225 mono_finalizer_unlock ();
227 /* Tell the finalizer thread to finalize this appdomain */
228 mono_gc_finalize_notify ();
230 res = WaitForSingleObjectEx (done_event, timeout, TRUE);
232 /* printf ("WAIT RES: %d.\n", res); */
233 if (res == WAIT_TIMEOUT) {
234 /* We leak the handle here */
238 CloseHandle (done_event);
241 /* We don't support domain finalization without a GC */
247 ves_icall_System_GC_InternalCollect (int generation)
249 mono_gc_collect (generation);
253 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection)
258 mono_gc_collect (mono_gc_max_generation ());
259 return mono_gc_get_used_size ();
263 ves_icall_System_GC_KeepAlive (MonoObject *obj)
273 ves_icall_System_GC_ReRegisterForFinalize (MonoObject *obj)
277 object_register_finalizer (obj, run_finalize);
281 ves_icall_System_GC_SuppressFinalize (MonoObject *obj)
285 /* delegates have no finalizers, but we register them to deal with the
286 * unmanaged->managed trampoline. We don't let the user suppress it
287 * otherwise we'd leak it.
289 if (obj->vtable->klass->delegate)
292 object_register_finalizer (obj, NULL);
296 ves_icall_System_GC_WaitForPendingFinalizers (void)
301 if (!mono_gc_pending_finalizers ())
304 if (mono_thread_current () == gc_thread)
305 /* Avoid deadlocks */
308 ResetEvent (pending_done_event);
309 mono_gc_finalize_notify ();
310 /* g_print ("Waiting for pending finalizers....\n"); */
311 WaitForSingleObjectEx (pending_done_event, INFINITE, TRUE);
312 /* g_print ("Done pending....\n"); */
316 #define mono_allocator_lock() EnterCriticalSection (&allocator_section)
317 #define mono_allocator_unlock() LeaveCriticalSection (&allocator_section)
318 static CRITICAL_SECTION allocator_section;
319 static CRITICAL_SECTION handle_section;
328 static void mono_gchandle_set_target (guint32 gchandle, MonoObject *obj);
331 ves_icall_System_GCHandle_GetTarget (guint32 handle)
333 return mono_gchandle_get_target (handle);
337 * if type == -1, change the target of the handle, otherwise allocate a new handle.
340 ves_icall_System_GCHandle_GetTargetHandle (MonoObject *obj, guint32 handle, gint32 type)
343 mono_gchandle_set_target (handle, obj);
344 /* the handle doesn't change */
349 return mono_gchandle_new_weakref (obj, FALSE);
350 case HANDLE_WEAK_TRACK:
351 return mono_gchandle_new_weakref (obj, TRUE);
353 return mono_gchandle_new (obj, FALSE);
355 return mono_gchandle_new (obj, TRUE);
357 g_assert_not_reached ();
363 ves_icall_System_GCHandle_FreeHandle (guint32 handle)
365 mono_gchandle_free (handle);
369 ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle)
373 obj = mono_gchandle_get_target (handle);
375 MonoClass *klass = mono_object_class (obj);
376 if (klass == mono_defaults.string_class) {
377 return mono_string_chars ((MonoString*)obj);
378 } else if (klass->rank) {
379 return mono_array_addr ((MonoArray*)obj, char, 0);
381 /* the C# code will check and throw the exception */
382 /* FIXME: missing !klass->blittable test, see bug #61134 */
383 if ((klass->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_AUTO_LAYOUT)
385 return (char*)obj + sizeof (MonoObject);
396 guint slot_hint : 24; /* starting slot for search */
397 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
398 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
402 /* weak and weak-track arrays will be allocated in malloc memory
404 static HandleData gc_handles [] = {
405 {NULL, NULL, 0, HANDLE_WEAK, 0},
406 {NULL, NULL, 0, HANDLE_WEAK_TRACK, 0},
407 {NULL, NULL, 0, HANDLE_NORMAL, 0},
408 {NULL, NULL, 0, HANDLE_PINNED, 0}
411 #define lock_handles(handles) EnterCriticalSection (&handle_section)
412 #define unlock_handles(handles) LeaveCriticalSection (&handle_section)
415 find_first_unset (guint32 bitmap)
418 for (i = 0; i < 32; ++i) {
419 if (!(bitmap & (1 << i)))
426 alloc_handle (HandleData *handles, MonoObject *obj)
429 lock_handles (handles);
430 if (!handles->size) {
432 if (handles->type > HANDLE_WEAK_TRACK) {
433 handles->entries = mono_gc_alloc_fixed (sizeof (gpointer) * handles->size, NULL);
435 handles->entries = g_malloc0 (sizeof (gpointer) * handles->size);
436 handles->domain_ids = g_malloc0 (sizeof (guint16) * handles->size);
438 handles->bitmap = g_malloc0 (handles->size / 8);
441 for (slot = handles->slot_hint; slot < handles->size / 32; ++slot) {
442 if (handles->bitmap [slot] != 0xffffffff) {
443 i = find_first_unset (handles->bitmap [slot]);
444 handles->slot_hint = slot;
448 if (i == -1 && handles->slot_hint != 0) {
449 for (slot = 0; slot < handles->slot_hint; ++slot) {
450 if (handles->bitmap [slot] != 0xffffffff) {
451 i = find_first_unset (handles->bitmap [slot]);
452 handles->slot_hint = slot;
459 guint32 new_size = handles->size * 2; /* always double: we memset to 0 based on this below */
461 /* resize and copy the bitmap */
462 new_bitmap = g_malloc0 (new_size / 8);
463 memcpy (new_bitmap, handles->bitmap, handles->size / 8);
464 g_free (handles->bitmap);
465 handles->bitmap = new_bitmap;
467 /* resize and copy the entries */
468 if (handles->type > HANDLE_WEAK_TRACK) {
470 entries = mono_gc_alloc_fixed (sizeof (gpointer) * new_size, NULL);
471 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
472 handles->entries = entries;
476 domain_ids = g_malloc0 (sizeof (guint16) * new_size);
477 entries = g_malloc (sizeof (gpointer) * new_size);
478 /* we disable GC because we could lose some disappearing link updates */
480 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
481 memset (entries + handles->size, 0, sizeof (gpointer) * handles->size);
482 memcpy (domain_ids, handles->domain_ids, sizeof (guint16) * handles->size);
483 for (i = 0; i < handles->size; ++i) {
484 MonoObject *obj = mono_gc_weak_link_get (&(handles->entries [i]));
485 if (handles->entries [i])
486 mono_gc_weak_link_remove (&(handles->entries [i]));
487 /*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]);*/
489 mono_gc_weak_link_add (&(entries [i]), obj);
492 g_free (handles->entries);
493 g_free (handles->domain_ids);
494 handles->entries = entries;
495 handles->domain_ids = domain_ids;
499 /* set i and slot to the next free position */
501 slot = (handles->size + 1) / 32;
502 handles->slot_hint = handles->size + 1;
503 handles->size = new_size;
505 handles->bitmap [slot] |= 1 << i;
506 slot = slot * 32 + i;
507 handles->entries [slot] = obj;
508 if (handles->type <= HANDLE_WEAK_TRACK) {
510 mono_gc_weak_link_add (&(handles->entries [slot]), obj);
513 unlock_handles (handles);
514 /*g_print ("allocated entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
515 return (slot << 3) | (handles->type + 1);
520 * @obj: managed object to get a handle for
521 * @pinned: whether the object should be pinned
523 * This returns a handle that wraps the object, this is used to keep a
524 * reference to a managed object from the unmanaged world and preventing the
525 * object from being disposed.
527 * If @pinned is false the address of the object can not be obtained, if it is
528 * true the address of the object can be obtained. This will also pin the
529 * object so it will not be possible by a moving garbage collector to move the
532 * Returns: a handle that can be used to access the object from
536 mono_gchandle_new (MonoObject *obj, gboolean pinned)
538 return alloc_handle (&gc_handles [pinned? HANDLE_PINNED: HANDLE_NORMAL], obj);
542 * mono_gchandle_new_weakref:
543 * @obj: managed object to get a handle for
544 * @pinned: whether the object should be pinned
546 * This returns a weak handle that wraps the object, this is used to
547 * keep a reference to a managed object from the unmanaged world.
548 * Unlike the mono_gchandle_new the object can be reclaimed by the
549 * garbage collector. In this case the value of the GCHandle will be
552 * If @pinned is false the address of the object can not be obtained, if it is
553 * true the address of the object can be obtained. This will also pin the
554 * object so it will not be possible by a moving garbage collector to move the
557 * Returns: a handle that can be used to access the object from
561 mono_gchandle_new_weakref (MonoObject *obj, gboolean track_resurrection)
563 return alloc_handle (&gc_handles [track_resurrection? HANDLE_WEAK_TRACK: HANDLE_WEAK], obj);
567 * mono_gchandle_get_target:
568 * @gchandle: a GCHandle's handle.
570 * The handle was previously created by calling mono_gchandle_new or
571 * mono_gchandle_new_weakref.
573 * Returns a pointer to the MonoObject represented by the handle or
574 * NULL for a collected object if using a weakref handle.
577 mono_gchandle_get_target (guint32 gchandle)
579 guint slot = gchandle >> 3;
580 guint type = (gchandle & 7) - 1;
581 HandleData *handles = &gc_handles [type];
582 MonoObject *obj = NULL;
585 lock_handles (handles);
586 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
587 if (handles->type <= HANDLE_WEAK_TRACK) {
588 obj = mono_gc_weak_link_get (&handles->entries [slot]);
590 obj = handles->entries [slot];
593 /* print a warning? */
595 unlock_handles (handles);
596 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
601 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
603 guint slot = gchandle >> 3;
604 guint type = (gchandle & 7) - 1;
605 HandleData *handles = &gc_handles [type];
608 lock_handles (handles);
609 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
610 if (handles->type <= HANDLE_WEAK_TRACK) {
611 if (handles->entries [slot])
612 mono_gc_weak_link_remove (&handles->entries [slot]);
614 mono_gc_weak_link_add (&handles->entries [slot], obj);
616 handles->entries [slot] = obj;
619 /* print a warning? */
621 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
622 unlock_handles (handles);
626 * mono_gchandle_is_in_domain:
627 * @gchandle: a GCHandle's handle.
628 * @domain: An application domain.
630 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
633 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
635 guint slot = gchandle >> 3;
636 guint type = (gchandle & 7) - 1;
637 HandleData *handles = &gc_handles [type];
638 gboolean result = FALSE;
641 lock_handles (handles);
642 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
643 if (handles->type <= HANDLE_WEAK_TRACK) {
644 result = domain->domain_id == handles->domain_ids [slot];
647 obj = handles->entries [slot];
651 result = domain == mono_object_domain (obj);
654 /* print a warning? */
656 unlock_handles (handles);
661 * mono_gchandle_free:
662 * @gchandle: a GCHandle's handle.
664 * Frees the @gchandle handle. If there are no outstanding
665 * references, the garbage collector can reclaim the memory of the
669 mono_gchandle_free (guint32 gchandle)
671 guint slot = gchandle >> 3;
672 guint type = (gchandle & 7) - 1;
673 HandleData *handles = &gc_handles [type];
676 lock_handles (handles);
677 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
678 if (handles->type <= HANDLE_WEAK_TRACK) {
679 if (handles->entries [slot])
680 mono_gc_weak_link_remove (&handles->entries [slot]);
682 handles->entries [slot] = NULL;
684 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
686 /* print a warning? */
688 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
689 unlock_handles (handles);
693 * mono_gchandle_free_domain:
694 * @domain: domain that is unloading
696 * Function used internally to cleanup any GC handle for objects belonging
697 * to the specified domain during appdomain unload.
700 mono_gchandle_free_domain (MonoDomain *domain)
704 for (type = 0; type < 3; ++type) {
706 HandleData *handles = &gc_handles [type];
707 lock_handles (handles);
708 for (slot = 0; slot < handles->size; ++slot) {
709 if (!(handles->bitmap [slot / 32] & (1 << (slot % 32))))
711 if (type <= HANDLE_WEAK_TRACK) {
712 if (domain->domain_id == handles->domain_ids [slot]) {
713 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
714 if (handles->entries [slot])
715 mono_gc_weak_link_remove (&handles->entries [slot]);
718 if (handles->entries [slot] && mono_object_domain (handles->entries [slot]) == domain) {
719 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
720 handles->entries [slot] = NULL;
724 unlock_handles (handles);
731 static HANDLE finalizer_event;
732 static volatile gboolean finished=FALSE;
735 mono_gc_finalize_notify (void)
738 g_message (G_GNUC_PRETTY_FUNCTION ": prodding finalizer");
741 SetEvent (finalizer_event);
745 collect_objects (gpointer key, gpointer value, gpointer user_data)
747 GPtrArray *arr = (GPtrArray*)user_data;
748 g_ptr_array_add (arr, key);
752 * finalize_domain_objects:
754 * Run the finalizers of all finalizable objects in req->domain.
757 finalize_domain_objects (DomainFinalizationReq *req)
761 MonoDomain *domain = req->domain;
763 while (g_hash_table_size (domain->finalizable_objects_hash) > 0) {
765 * Since the domain is unloading, nobody is allowed to put
766 * new entries into the hash table. But finalize_object might
767 * remove entries from the hash table, so we make a copy.
769 objs = g_ptr_array_new ();
770 g_hash_table_foreach (domain->finalizable_objects_hash,
771 collect_objects, objs);
772 /* printf ("FINALIZING %d OBJECTS.\n", objs->len); */
774 for (i = 0; i < objs->len; ++i) {
775 MonoObject *o = (MonoObject*)g_ptr_array_index (objs, i);
776 /* FIXME: Avoid finalizing threads, etc */
780 g_ptr_array_free (objs, TRUE);
783 /* Process finalizers which are already in the queue */
784 mono_gc_invoke_finalizers ();
786 /* printf ("DONE.\n"); */
787 SetEvent (req->done_event);
789 /* The event is closed in mono_domain_finalize if we get here */
793 static guint32 finalizer_thread (gpointer unused)
795 gc_thread = mono_thread_current ();
797 SetEvent (thread_started_event);
800 /* Wait to be notified that there's at least one
803 /* Use alertable=FALSE since we will be asked to exit using the event too */
804 WaitForSingleObjectEx (finalizer_event, INFINITE, FALSE);
806 if (domains_to_finalize) {
807 mono_finalizer_lock ();
808 if (domains_to_finalize) {
809 DomainFinalizationReq *req = domains_to_finalize->data;
810 domains_to_finalize = g_slist_remove (domains_to_finalize, req);
811 mono_finalizer_unlock ();
813 finalize_domain_objects (req);
816 mono_finalizer_unlock ();
820 g_message (G_GNUC_PRETTY_FUNCTION ": invoking finalizers");
823 /* If finished == TRUE, mono_gc_cleanup has been called (from mono_runtime_cleanup),
824 * before the domain is unloaded.
826 mono_gc_invoke_finalizers ();
828 SetEvent (pending_done_event);
831 SetEvent (shutdown_event);
836 * Enable or disable the separate finalizer thread.
837 * It's currently disabled because it still requires some
838 * work in the rest of the runtime.
840 #define ENABLE_FINALIZER_THREAD
845 InitializeCriticalSection (&handle_section);
846 InitializeCriticalSection (&allocator_section);
848 InitializeCriticalSection (&finalizer_mutex);
850 MONO_GC_REGISTER_ROOT (gc_handles [HANDLE_NORMAL].entries);
851 MONO_GC_REGISTER_ROOT (gc_handles [HANDLE_PINNED].entries);
853 mono_gc_base_init ();
855 #ifdef ENABLE_FINALIZER_THREAD
857 if (g_getenv ("GC_DONT_GC")) {
862 finalizer_event = CreateEvent (NULL, FALSE, FALSE, NULL);
863 pending_done_event = CreateEvent (NULL, TRUE, FALSE, NULL);
864 shutdown_event = CreateEvent (NULL, TRUE, FALSE, NULL);
865 thread_started_event = CreateEvent (NULL, TRUE, FALSE, NULL);
866 if (finalizer_event == NULL || pending_done_event == NULL || shutdown_event == NULL || thread_started_event == NULL) {
867 g_assert_not_reached ();
870 mono_thread_create (mono_domain_get (), finalizer_thread, NULL);
872 * Wait until the finalizer thread sets gc_thread since its value is needed
873 * by mono_thread_attach ()
875 WaitForSingleObjectEx (thread_started_event, INFINITE, FALSE);
879 void mono_gc_cleanup (void)
882 g_message (G_GNUC_PRETTY_FUNCTION ": cleaning up finalizer");
885 #ifdef ENABLE_FINALIZER_THREAD
887 ResetEvent (shutdown_event);
889 if (mono_thread_current () != gc_thread) {
890 mono_gc_finalize_notify ();
891 /* Finishing the finalizer thread, so wait a little bit... */
892 /* MS seems to wait for about 2 seconds */
893 if (WaitForSingleObjectEx (shutdown_event, 2000, FALSE) == WAIT_TIMEOUT) {
894 mono_thread_stop (gc_thread);
899 GC_finalizer_notifier = NULL;
905 DeleteCriticalSection (&handle_section);
906 DeleteCriticalSection (&allocator_section);
907 DeleteCriticalSection (&finalizer_mutex);
912 /* no Boehm GC support. */
913 void mono_gc_init (void)
915 InitializeCriticalSection (&handle_section);
918 void mono_gc_cleanup (void)
925 * mono_gc_is_finalizer_thread:
926 * @thread: the thread to test.
928 * In Mono objects are finalized asynchronously on a separate thread.
929 * This routine tests whether the @thread argument represents the
930 * finalization thread.
932 * Returns true if @thread is the finalization thread.
935 mono_gc_is_finalizer_thread (MonoThread *thread)
937 return thread == gc_thread;