2 * metadata/gc.c: GC icalls.
4 * Author: Paolo Molaro <lupus@ximian.com>
6 * Copyright 2002-2003 Ximian, Inc (http://www.ximian.com)
7 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
15 #include <mono/metadata/gc-internal.h>
16 #include <mono/metadata/mono-gc.h>
17 #include <mono/metadata/threads.h>
18 #include <mono/metadata/tabledefs.h>
19 #include <mono/metadata/exception.h>
20 #include <mono/metadata/profiler-private.h>
21 #include <mono/metadata/domain-internals.h>
22 #include <mono/metadata/class-internals.h>
23 #include <mono/metadata/metadata-internals.h>
24 #include <mono/metadata/mono-mlist.h>
25 #include <mono/metadata/threadpool.h>
26 #include <mono/metadata/threads-types.h>
27 #include <mono/utils/mono-logger-internal.h>
28 #include <mono/metadata/gc-internal.h>
29 #include <mono/metadata/marshal.h> /* for mono_delegate_free_ftnptr () */
30 #include <mono/metadata/attach.h>
31 #include <mono/metadata/console-io.h>
32 #include <mono/utils/mono-semaphore.h>
38 typedef struct DomainFinalizationReq {
41 } DomainFinalizationReq;
43 #ifdef PLATFORM_WINCE /* FIXME: add accessors to gc.dll API */
44 extern void (*__imp_GC_finalizer_notifier)(void);
45 #define GC_finalizer_notifier __imp_GC_finalizer_notifier
46 extern int __imp_GC_finalize_on_demand;
47 #define GC_finalize_on_demand __imp_GC_finalize_on_demand
50 static gboolean gc_disabled = FALSE;
52 static gboolean finalizing_root_domain = FALSE;
54 #define mono_finalizer_lock() EnterCriticalSection (&finalizer_mutex)
55 #define mono_finalizer_unlock() LeaveCriticalSection (&finalizer_mutex)
56 static CRITICAL_SECTION finalizer_mutex;
58 static GSList *domains_to_finalize= NULL;
59 static MonoMList *threads_to_finalize = NULL;
61 static MonoInternalThread *gc_thread;
63 static void object_register_finalizer (MonoObject *obj, void (*callback)(void *, void*));
65 static void mono_gchandle_set_target (guint32 gchandle, MonoObject *obj);
68 static HANDLE pending_done_event;
69 static HANDLE shutdown_event;
73 add_thread_to_finalize (MonoInternalThread *thread)
75 mono_finalizer_lock ();
76 if (!threads_to_finalize)
77 MONO_GC_REGISTER_ROOT_SINGLE (threads_to_finalize);
78 threads_to_finalize = mono_mlist_append (threads_to_finalize, (MonoObject*)thread);
79 mono_finalizer_unlock ();
82 static gboolean suspend_finalizers = FALSE;
84 * actually, we might want to queue the finalize requests in a separate thread,
85 * but we need to be careful about the execution domain of the thread...
88 mono_gc_run_finalize (void *obj, void *data)
90 MonoObject *exc = NULL;
95 MonoMethod* finalizer = NULL;
96 MonoDomain *caller_domain = mono_domain_get ();
98 RuntimeInvokeFunction runtime_invoke;
99 GSList *l, *refs = NULL;
101 o = (MonoObject*)((char*)obj + GPOINTER_TO_UINT (data));
103 if (suspend_finalizers)
106 domain = o->vtable->domain;
109 mono_domain_finalizers_lock (domain);
111 o2 = g_hash_table_lookup (domain->finalizable_objects_hash, o);
113 refs = mono_gc_remove_weak_track_object (domain, o);
115 mono_domain_finalizers_unlock (domain);
118 /* Already finalized somehow */
124 * Support for GCHandles of type WeakTrackResurrection:
126 * Its not exactly clear how these are supposed to work, or how their
127 * semantics can be implemented. We only implement one crucial thing:
128 * these handles are only cleared after the finalizer has ran.
130 for (l = refs; l; l = l->next) {
131 guint32 gchandle = GPOINTER_TO_UINT (l->data);
133 mono_gchandle_set_target (gchandle, o);
139 /* make sure the finalizer is not called again if the object is resurrected */
140 object_register_finalizer (obj, NULL);
142 if (o->vtable->klass == mono_defaults.internal_thread_class) {
143 MonoInternalThread *t = (MonoInternalThread*)o;
145 if (mono_gc_is_finalizer_internal_thread (t))
146 /* Avoid finalizing ourselves */
149 if (t->threadpool_thread && finalizing_root_domain) {
150 /* Don't finalize threadpool threads when
151 shutting down - they're finalized when the
152 threadpool shuts down. */
153 add_thread_to_finalize (t);
158 if (o->vtable->klass->image == mono_defaults.corlib && !strcmp (o->vtable->klass->name, "DynamicMethod") && finalizing_root_domain) {
160 * These can't be finalized during unloading/shutdown, since that would
161 * free the native code which can still be referenced by other
163 * FIXME: This is not perfect, objects dying at the same time as
164 * dynamic methods can still reference them even when !shutdown.
169 if (mono_runtime_get_no_exec ())
172 /* speedup later... and use a timeout */
173 /* g_print ("Finalize run on %p %s.%s\n", o, mono_object_class (o)->name_space, mono_object_class (o)->name); */
175 /* Use _internal here, since this thread can enter a doomed appdomain */
176 mono_domain_set_internal (mono_object_domain (o));
178 /* delegates that have a native function pointer allocated are
179 * registered for finalization, but they don't have a Finalize
180 * method, because in most cases it's not needed and it's just a waste.
182 if (o->vtable->klass->delegate) {
183 MonoDelegate* del = (MonoDelegate*)o;
184 if (del->delegate_trampoline)
185 mono_delegate_free_ftnptr ((MonoDelegate*)o);
186 mono_domain_set_internal (caller_domain);
190 finalizer = mono_class_get_finalizer (o->vtable->klass);
193 /* If object has a CCW but has no finalizer, it was only
194 * registered for finalization in order to free the CCW.
195 * Else it needs the regular finalizer run.
196 * FIXME: what to do about ressurection and suppression
197 * of finalizer on object with CCW.
199 if (mono_marshal_free_ccw (o) && !finalizer) {
200 mono_domain_set_internal (caller_domain);
206 * To avoid the locking plus the other overhead of mono_runtime_invoke (),
207 * create and precompile a wrapper which calls the finalize method using
210 if (!domain->finalize_runtime_invoke) {
211 MonoMethod *invoke = mono_marshal_get_runtime_invoke (mono_class_get_method_from_name_flags (mono_defaults.object_class, "Finalize", 0, 0), TRUE);
213 domain->finalize_runtime_invoke = mono_compile_method (invoke);
216 runtime_invoke = domain->finalize_runtime_invoke;
218 mono_runtime_class_init (o->vtable);
220 runtime_invoke (o, NULL, &exc, NULL);
223 /* fixme: do something useful */
226 mono_domain_set_internal (caller_domain);
230 mono_gc_finalize_threadpool_threads (void)
232 while (threads_to_finalize) {
233 MonoInternalThread *thread = (MonoInternalThread*) mono_mlist_get_data (threads_to_finalize);
235 /* Force finalization of the thread. */
236 thread->threadpool_thread = FALSE;
237 mono_object_register_finalizer ((MonoObject*)thread);
239 mono_gc_run_finalize (thread, NULL);
241 threads_to_finalize = mono_mlist_next (threads_to_finalize);
246 mono_gc_out_of_memory (size_t size)
249 * we could allocate at program startup some memory that we could release
250 * back to the system at this point if we're really low on memory (ie, size is
251 * lower than the memory we set apart)
253 mono_raise_exception (mono_domain_get ()->out_of_memory_ex);
259 * Some of our objects may point to a different address than the address returned by GC_malloc()
260 * (because of the GetHashCode hack), but we need to pass the real address to register_finalizer.
261 * This also means that in the callback we need to adjust the pointer to get back the real
263 * We also need to be consistent in the use of the GC_debug* variants of malloc and register_finalizer,
264 * since that, too, can cause the underlying pointer to be offset.
267 object_register_finalizer (MonoObject *obj, void (*callback)(void *, void*))
274 mono_raise_exception (mono_get_exception_argument_null ("obj"));
276 domain = obj->vtable->domain;
279 /* This assertion is not valid when GC_DEBUG is defined */
280 g_assert (GC_base (obj) == (char*)obj - offset);
283 if (mono_domain_is_unloading (domain) && (callback != NULL))
285 * Can't register finalizers in a dying appdomain, since they
286 * could be invoked after the appdomain has been unloaded.
290 mono_domain_finalizers_lock (domain);
293 g_hash_table_insert (domain->finalizable_objects_hash, obj, obj);
295 g_hash_table_remove (domain->finalizable_objects_hash, obj);
297 mono_domain_finalizers_unlock (domain);
299 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, callback, GUINT_TO_POINTER (offset), NULL, NULL);
300 #elif defined(HAVE_SGEN_GC)
302 mono_raise_exception (mono_get_exception_argument_null ("obj"));
305 * If we register finalizers for domains that are unloading we might
306 * end up running them while or after the domain is being cleared, so
307 * the objects will not be valid anymore.
309 if (!mono_domain_is_unloading (obj->vtable->domain))
310 mono_gc_register_for_finalization (obj, callback);
315 * mono_object_register_finalizer:
316 * @obj: object to register
318 * Records that object @obj has a finalizer, this will call the
319 * Finalize method when the garbage collector disposes the object.
323 mono_object_register_finalizer (MonoObject *obj)
325 /* g_print ("Registered finalizer on %p %s.%s\n", obj, mono_object_class (obj)->name_space, mono_object_class (obj)->name); */
326 object_register_finalizer (obj, mono_gc_run_finalize);
330 * mono_domain_finalize:
331 * @domain: the domain to finalize
332 * @timeout: msects to wait for the finalization to complete, -1 to wait indefinitely
334 * Request finalization of all finalizable objects inside @domain. Wait
335 * @timeout msecs for the finalization to complete.
337 * Returns: TRUE if succeeded, FALSE if there was a timeout
341 mono_domain_finalize (MonoDomain *domain, guint32 timeout)
343 DomainFinalizationReq *req;
347 if (mono_thread_internal_current () == gc_thread)
348 /* We are called from inside a finalizer, not much we can do here */
352 * No need to create another thread 'cause the finalizer thread
353 * is still working and will take care of running the finalizers
360 mono_gc_collect (mono_gc_max_generation ());
362 done_event = CreateEvent (NULL, TRUE, FALSE, NULL);
363 if (done_event == NULL) {
367 req = g_new0 (DomainFinalizationReq, 1);
368 req->domain = domain;
369 req->done_event = done_event;
371 if (domain == mono_get_root_domain ())
372 finalizing_root_domain = TRUE;
374 mono_finalizer_lock ();
376 domains_to_finalize = g_slist_append (domains_to_finalize, req);
378 mono_finalizer_unlock ();
380 /* Tell the finalizer thread to finalize this appdomain */
381 mono_gc_finalize_notify ();
386 res = WaitForSingleObjectEx (done_event, timeout, TRUE);
388 /* printf ("WAIT RES: %d.\n", res); */
389 if (res == WAIT_TIMEOUT) {
390 /* We leak the handle here */
394 CloseHandle (done_event);
396 if (domain == mono_get_root_domain ()) {
397 mono_thread_pool_cleanup ();
398 mono_gc_finalize_threadpool_threads ();
403 /* We don't support domain finalization without a GC */
409 ves_icall_System_GC_InternalCollect (int generation)
411 mono_gc_collect (generation);
415 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection)
420 mono_gc_collect (mono_gc_max_generation ());
421 return mono_gc_get_used_size ();
425 ves_icall_System_GC_KeepAlive (MonoObject *obj)
435 ves_icall_System_GC_ReRegisterForFinalize (MonoObject *obj)
438 mono_raise_exception (mono_get_exception_argument_null ("obj"));
440 object_register_finalizer (obj, mono_gc_run_finalize);
444 ves_icall_System_GC_SuppressFinalize (MonoObject *obj)
447 mono_raise_exception (mono_get_exception_argument_null ("obj"));
449 /* delegates have no finalizers, but we register them to deal with the
450 * unmanaged->managed trampoline. We don't let the user suppress it
451 * otherwise we'd leak it.
453 if (obj->vtable->klass->delegate)
456 /* FIXME: Need to handle case where obj has COM Callable Wrapper
457 * generated for it that needs cleaned up, but user wants to suppress
458 * their derived object finalizer. */
460 object_register_finalizer (obj, NULL);
464 ves_icall_System_GC_WaitForPendingFinalizers (void)
467 if (!mono_gc_pending_finalizers ())
470 if (mono_thread_internal_current () == gc_thread)
471 /* Avoid deadlocks */
474 ResetEvent (pending_done_event);
475 mono_gc_finalize_notify ();
476 /* g_print ("Waiting for pending finalizers....\n"); */
477 WaitForSingleObjectEx (pending_done_event, INFINITE, TRUE);
478 /* g_print ("Done pending....\n"); */
483 ves_icall_System_GC_register_ephemeron_array (MonoObject *array)
486 if (!mono_gc_ephemeron_array_add (array))
487 mono_raise_exception (mono_object_domain (array)->out_of_memory_ex);
492 ves_icall_System_GC_get_ephemeron_tombstone (void)
494 return mono_domain_get ()->ephemeron_tombstone;
497 #define mono_allocator_lock() EnterCriticalSection (&allocator_section)
498 #define mono_allocator_unlock() LeaveCriticalSection (&allocator_section)
499 static CRITICAL_SECTION allocator_section;
500 static CRITICAL_SECTION handle_section;
509 static HandleType mono_gchandle_get_type (guint32 gchandle);
512 ves_icall_System_GCHandle_GetTarget (guint32 handle)
514 return mono_gchandle_get_target (handle);
518 * if type == -1, change the target of the handle, otherwise allocate a new handle.
521 ves_icall_System_GCHandle_GetTargetHandle (MonoObject *obj, guint32 handle, gint32 type)
524 mono_gchandle_set_target (handle, obj);
525 /* the handle doesn't change */
530 return mono_gchandle_new_weakref (obj, FALSE);
531 case HANDLE_WEAK_TRACK:
532 return mono_gchandle_new_weakref (obj, TRUE);
534 return mono_gchandle_new (obj, FALSE);
536 return mono_gchandle_new (obj, TRUE);
538 g_assert_not_reached ();
544 ves_icall_System_GCHandle_FreeHandle (guint32 handle)
546 mono_gchandle_free (handle);
550 ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle)
554 if (mono_gchandle_get_type (handle) != HANDLE_PINNED)
556 obj = mono_gchandle_get_target (handle);
558 MonoClass *klass = mono_object_class (obj);
559 if (klass == mono_defaults.string_class) {
560 return mono_string_chars ((MonoString*)obj);
561 } else if (klass->rank) {
562 return mono_array_addr ((MonoArray*)obj, char, 0);
564 /* the C# code will check and throw the exception */
565 /* FIXME: missing !klass->blittable test, see bug #61134 */
566 if ((klass->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_AUTO_LAYOUT)
568 return (char*)obj + sizeof (MonoObject);
579 guint slot_hint : 24; /* starting slot for search */
580 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
581 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
585 /* weak and weak-track arrays will be allocated in malloc memory
587 static HandleData gc_handles [] = {
588 {NULL, NULL, 0, HANDLE_WEAK, 0},
589 {NULL, NULL, 0, HANDLE_WEAK_TRACK, 0},
590 {NULL, NULL, 0, HANDLE_NORMAL, 0},
591 {NULL, NULL, 0, HANDLE_PINNED, 0}
594 #define lock_handles(handles) EnterCriticalSection (&handle_section)
595 #define unlock_handles(handles) LeaveCriticalSection (&handle_section)
598 find_first_unset (guint32 bitmap)
601 for (i = 0; i < 32; ++i) {
602 if (!(bitmap & (1 << i)))
609 alloc_handle (HandleData *handles, MonoObject *obj, gboolean track)
613 lock_handles (handles);
614 if (!handles->size) {
616 if (handles->type > HANDLE_WEAK_TRACK) {
617 handles->entries = mono_gc_alloc_fixed (sizeof (gpointer) * handles->size, mono_gc_make_root_descr_all_refs (handles->size));
619 handles->entries = g_malloc0 (sizeof (gpointer) * handles->size);
620 handles->domain_ids = g_malloc0 (sizeof (guint16) * handles->size);
622 handles->bitmap = g_malloc0 (handles->size / 8);
625 for (slot = handles->slot_hint; slot < handles->size / 32; ++slot) {
626 if (handles->bitmap [slot] != 0xffffffff) {
627 i = find_first_unset (handles->bitmap [slot]);
628 handles->slot_hint = slot;
632 if (i == -1 && handles->slot_hint != 0) {
633 for (slot = 0; slot < handles->slot_hint; ++slot) {
634 if (handles->bitmap [slot] != 0xffffffff) {
635 i = find_first_unset (handles->bitmap [slot]);
636 handles->slot_hint = slot;
643 guint32 new_size = handles->size * 2; /* always double: we memset to 0 based on this below */
645 /* resize and copy the bitmap */
646 new_bitmap = g_malloc0 (new_size / 8);
647 memcpy (new_bitmap, handles->bitmap, handles->size / 8);
648 g_free (handles->bitmap);
649 handles->bitmap = new_bitmap;
651 /* resize and copy the entries */
652 if (handles->type > HANDLE_WEAK_TRACK) {
655 entries = mono_gc_alloc_fixed (sizeof (gpointer) * new_size, mono_gc_make_root_descr_all_refs (new_size));
656 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
658 mono_gc_free_fixed (handles->entries);
659 handles->entries = entries;
663 domain_ids = g_malloc0 (sizeof (guint16) * new_size);
664 entries = g_malloc (sizeof (gpointer) * new_size);
665 /* we disable GC because we could lose some disappearing link updates */
667 memcpy (entries, handles->entries, sizeof (gpointer) * handles->size);
668 memset (entries + handles->size, 0, sizeof (gpointer) * handles->size);
669 memcpy (domain_ids, handles->domain_ids, sizeof (guint16) * handles->size);
670 for (i = 0; i < handles->size; ++i) {
671 MonoObject *obj = mono_gc_weak_link_get (&(handles->entries [i]));
672 if (handles->entries [i])
673 mono_gc_weak_link_remove (&(handles->entries [i]));
674 /*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]);*/
676 mono_gc_weak_link_add (&(entries [i]), obj, track);
679 g_free (handles->entries);
680 g_free (handles->domain_ids);
681 handles->entries = entries;
682 handles->domain_ids = domain_ids;
686 /* set i and slot to the next free position */
688 slot = (handles->size + 1) / 32;
689 handles->slot_hint = handles->size + 1;
690 handles->size = new_size;
692 handles->bitmap [slot] |= 1 << i;
693 slot = slot * 32 + i;
694 handles->entries [slot] = obj;
695 if (handles->type <= HANDLE_WEAK_TRACK) {
696 /*FIXME, what to use when obj == null?*/
697 handles->domain_ids [slot] = (obj ? mono_object_get_domain (obj) : mono_domain_get ())->domain_id;
699 mono_gc_weak_link_add (&(handles->entries [slot]), obj, track);
702 mono_perfcounters->gc_num_handles++;
703 unlock_handles (handles);
704 /*g_print ("allocated entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
705 res = (slot << 3) | (handles->type + 1);
706 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handles->type, res, obj);
712 * @obj: managed object to get a handle for
713 * @pinned: whether the object should be pinned
715 * This returns a handle that wraps the object, this is used to keep a
716 * reference to a managed object from the unmanaged world and preventing the
717 * object from being disposed.
719 * If @pinned is false the address of the object can not be obtained, if it is
720 * true the address of the object can be obtained. This will also pin the
721 * object so it will not be possible by a moving garbage collector to move the
724 * Returns: a handle that can be used to access the object from
728 mono_gchandle_new (MonoObject *obj, gboolean pinned)
730 return alloc_handle (&gc_handles [pinned? HANDLE_PINNED: HANDLE_NORMAL], obj, FALSE);
734 * mono_gchandle_new_weakref:
735 * @obj: managed object to get a handle for
736 * @pinned: whether the object should be pinned
738 * This returns a weak handle that wraps the object, this is used to
739 * keep a reference to a managed object from the unmanaged world.
740 * Unlike the mono_gchandle_new the object can be reclaimed by the
741 * garbage collector. In this case the value of the GCHandle will be
744 * If @pinned is false the address of the object can not be obtained, if it is
745 * true the address of the object can be obtained. This will also pin the
746 * object so it will not be possible by a moving garbage collector to move the
749 * Returns: a handle that can be used to access the object from
753 mono_gchandle_new_weakref (MonoObject *obj, gboolean track_resurrection)
755 guint32 handle = alloc_handle (&gc_handles [track_resurrection? HANDLE_WEAK_TRACK: HANDLE_WEAK], obj, track_resurrection);
758 if (track_resurrection)
759 mono_gc_add_weak_track_handle (obj, handle);
766 mono_gchandle_get_type (guint32 gchandle)
768 guint type = (gchandle & 7) - 1;
774 * mono_gchandle_get_target:
775 * @gchandle: a GCHandle's handle.
777 * The handle was previously created by calling mono_gchandle_new or
778 * mono_gchandle_new_weakref.
780 * Returns a pointer to the MonoObject represented by the handle or
781 * NULL for a collected object if using a weakref handle.
784 mono_gchandle_get_target (guint32 gchandle)
786 guint slot = gchandle >> 3;
787 guint type = (gchandle & 7) - 1;
788 HandleData *handles = &gc_handles [type];
789 MonoObject *obj = NULL;
792 lock_handles (handles);
793 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
794 if (handles->type <= HANDLE_WEAK_TRACK) {
795 obj = mono_gc_weak_link_get (&handles->entries [slot]);
797 obj = handles->entries [slot];
800 /* print a warning? */
802 unlock_handles (handles);
803 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
808 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
810 guint slot = gchandle >> 3;
811 guint type = (gchandle & 7) - 1;
812 HandleData *handles = &gc_handles [type];
813 MonoObject *old_obj = NULL;
817 lock_handles (handles);
818 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
819 if (handles->type <= HANDLE_WEAK_TRACK) {
820 old_obj = handles->entries [slot];
821 if (handles->entries [slot])
822 mono_gc_weak_link_remove (&handles->entries [slot]);
824 mono_gc_weak_link_add (&handles->entries [slot], obj, handles->type == HANDLE_WEAK_TRACK);
825 /*FIXME, what to use when obj == null?*/
826 handles->domain_ids [slot] = (obj ? mono_object_get_domain (obj) : mono_domain_get ())->domain_id;
828 handles->entries [slot] = obj;
831 /* print a warning? */
833 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
834 unlock_handles (handles);
837 if (type == HANDLE_WEAK_TRACK)
838 mono_gc_change_weak_track_handle (old_obj, obj, gchandle);
843 * mono_gchandle_is_in_domain:
844 * @gchandle: a GCHandle's handle.
845 * @domain: An application domain.
847 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
850 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
852 guint slot = gchandle >> 3;
853 guint type = (gchandle & 7) - 1;
854 HandleData *handles = &gc_handles [type];
855 gboolean result = FALSE;
858 lock_handles (handles);
859 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
860 if (handles->type <= HANDLE_WEAK_TRACK) {
861 result = domain->domain_id == handles->domain_ids [slot];
864 obj = handles->entries [slot];
868 result = domain == mono_object_domain (obj);
871 /* print a warning? */
873 unlock_handles (handles);
878 * mono_gchandle_free:
879 * @gchandle: a GCHandle's handle.
881 * Frees the @gchandle handle. If there are no outstanding
882 * references, the garbage collector can reclaim the memory of the
886 mono_gchandle_free (guint32 gchandle)
888 guint slot = gchandle >> 3;
889 guint type = (gchandle & 7) - 1;
890 HandleData *handles = &gc_handles [type];
894 if (type == HANDLE_WEAK_TRACK)
895 mono_gc_remove_weak_track_handle (gchandle);
898 lock_handles (handles);
899 if (slot < handles->size && (handles->bitmap [slot / 32] & (1 << (slot % 32)))) {
900 if (handles->type <= HANDLE_WEAK_TRACK) {
901 if (handles->entries [slot])
902 mono_gc_weak_link_remove (&handles->entries [slot]);
904 handles->entries [slot] = NULL;
906 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
908 /* print a warning? */
910 mono_perfcounters->gc_num_handles--;
911 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
912 unlock_handles (handles);
913 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handles->type, gchandle, NULL);
917 * mono_gchandle_free_domain:
918 * @domain: domain that is unloading
920 * Function used internally to cleanup any GC handle for objects belonging
921 * to the specified domain during appdomain unload.
924 mono_gchandle_free_domain (MonoDomain *domain)
928 for (type = 0; type < 3; ++type) {
930 HandleData *handles = &gc_handles [type];
931 lock_handles (handles);
932 for (slot = 0; slot < handles->size; ++slot) {
933 if (!(handles->bitmap [slot / 32] & (1 << (slot % 32))))
935 if (type <= HANDLE_WEAK_TRACK) {
936 if (domain->domain_id == handles->domain_ids [slot]) {
937 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
938 if (handles->entries [slot])
939 mono_gc_weak_link_remove (&handles->entries [slot]);
942 if (handles->entries [slot] && mono_object_domain (handles->entries [slot]) == domain) {
943 handles->bitmap [slot / 32] &= ~(1 << (slot % 32));
944 handles->entries [slot] = NULL;
948 unlock_handles (handles);
954 GCHandle_CheckCurrentDomain (guint32 gchandle)
956 return mono_gchandle_is_in_domain (gchandle, mono_domain_get ());
961 #ifdef MONO_HAS_SEMAPHORES
962 static MonoSemType finalizer_sem;
964 static HANDLE finalizer_event;
965 static volatile gboolean finished=FALSE;
968 mono_gc_finalize_notify (void)
971 g_message ( "%s: prodding finalizer", __func__);
974 #ifdef MONO_HAS_SEMAPHORES
975 MONO_SEM_POST (&finalizer_sem);
977 SetEvent (finalizer_event);
984 collect_objects (gpointer key, gpointer value, gpointer user_data)
986 GPtrArray *arr = (GPtrArray*)user_data;
987 g_ptr_array_add (arr, key);
993 * finalize_domain_objects:
995 * Run the finalizers of all finalizable objects in req->domain.
998 finalize_domain_objects (DomainFinalizationReq *req)
1000 MonoDomain *domain = req->domain;
1002 #ifdef HAVE_BOEHM_GC
1003 while (g_hash_table_size (domain->finalizable_objects_hash) > 0) {
1007 * Since the domain is unloading, nobody is allowed to put
1008 * new entries into the hash table. But finalize_object might
1009 * remove entries from the hash table, so we make a copy.
1011 objs = g_ptr_array_new ();
1012 g_hash_table_foreach (domain->finalizable_objects_hash, collect_objects, objs);
1013 /* printf ("FINALIZING %d OBJECTS.\n", objs->len); */
1015 for (i = 0; i < objs->len; ++i) {
1016 MonoObject *o = (MonoObject*)g_ptr_array_index (objs, i);
1017 /* FIXME: Avoid finalizing threads, etc */
1018 mono_gc_run_finalize (o, 0);
1021 g_ptr_array_free (objs, TRUE);
1023 #elif defined(HAVE_SGEN_GC)
1024 #define NUM_FOBJECTS 64
1025 MonoObject *to_finalize [NUM_FOBJECTS];
1027 while ((count = mono_gc_finalizers_for_domain (domain, to_finalize, NUM_FOBJECTS))) {
1029 for (i = 0; i < count; ++i) {
1030 mono_gc_run_finalize (to_finalize [i], 0);
1035 /* Process finalizers which are already in the queue */
1036 mono_gc_invoke_finalizers ();
1038 /* printf ("DONE.\n"); */
1039 SetEvent (req->done_event);
1041 /* The event is closed in mono_domain_finalize if we get here */
1046 finalizer_thread (gpointer unused)
1049 /* Wait to be notified that there's at least one
1053 g_assert (mono_domain_get () == mono_get_root_domain ());
1055 #ifdef MONO_HAS_SEMAPHORES
1056 MONO_SEM_WAIT (&finalizer_sem);
1058 /* Use alertable=FALSE since we will be asked to exit using the event too */
1059 WaitForSingleObjectEx (finalizer_event, INFINITE, FALSE);
1062 mono_console_handle_async_ops ();
1064 #ifndef DISABLE_ATTACH
1065 mono_attach_maybe_start ();
1068 if (domains_to_finalize) {
1069 mono_finalizer_lock ();
1070 if (domains_to_finalize) {
1071 DomainFinalizationReq *req = domains_to_finalize->data;
1072 domains_to_finalize = g_slist_remove (domains_to_finalize, req);
1073 mono_finalizer_unlock ();
1075 finalize_domain_objects (req);
1077 mono_finalizer_unlock ();
1081 /* If finished == TRUE, mono_gc_cleanup has been called (from mono_runtime_cleanup),
1082 * before the domain is unloaded.
1084 mono_gc_invoke_finalizers ();
1086 SetEvent (pending_done_event);
1089 SetEvent (shutdown_event);
1096 InitializeCriticalSection (&handle_section);
1097 InitializeCriticalSection (&allocator_section);
1099 InitializeCriticalSection (&finalizer_mutex);
1101 MONO_GC_REGISTER_ROOT_FIXED (gc_handles [HANDLE_NORMAL].entries);
1102 MONO_GC_REGISTER_ROOT_FIXED (gc_handles [HANDLE_PINNED].entries);
1104 mono_gc_base_init ();
1106 if (mono_gc_is_disabled ()) {
1111 finalizer_event = CreateEvent (NULL, FALSE, FALSE, NULL);
1112 pending_done_event = CreateEvent (NULL, TRUE, FALSE, NULL);
1113 shutdown_event = CreateEvent (NULL, TRUE, FALSE, NULL);
1114 if (finalizer_event == NULL || pending_done_event == NULL || shutdown_event == NULL) {
1115 g_assert_not_reached ();
1117 #ifdef MONO_HAS_SEMAPHORES
1118 MONO_SEM_INIT (&finalizer_sem, 0);
1121 gc_thread = mono_thread_create_internal (mono_domain_get (), finalizer_thread, NULL, FALSE);
1122 ves_icall_System_Threading_Thread_SetName_internal (gc_thread, mono_string_new (mono_domain_get (), "Finalizer"));
1126 mono_gc_cleanup (void)
1129 g_message ("%s: cleaning up finalizer", __func__);
1133 ResetEvent (shutdown_event);
1135 if (mono_thread_internal_current () != gc_thread) {
1136 mono_gc_finalize_notify ();
1137 /* Finishing the finalizer thread, so wait a little bit... */
1138 /* MS seems to wait for about 2 seconds */
1139 if (WaitForSingleObjectEx (shutdown_event, 2000, FALSE) == WAIT_TIMEOUT) {
1142 /* Set a flag which the finalizer thread can check */
1143 suspend_finalizers = TRUE;
1145 /* Try to abort the thread, in the hope that it is running managed code */
1146 mono_thread_internal_stop (gc_thread);
1148 /* Wait for it to stop */
1149 ret = WaitForSingleObjectEx (gc_thread->handle, 100, TRUE);
1151 if (ret == WAIT_TIMEOUT) {
1153 * The finalizer thread refused to die. There is not much we
1154 * can do here, since the runtime is shutting down so the
1155 * state the finalizer thread depends on will vanish.
1157 g_warning ("Shutting down finalizer thread timed out.");
1160 * FIXME: On unix, when the above wait returns, the thread
1161 * might still be running io-layer code, or pthreads code.
1169 #ifdef HAVE_BOEHM_GC
1170 GC_finalizer_notifier = NULL;
1174 DeleteCriticalSection (&handle_section);
1175 DeleteCriticalSection (&allocator_section);
1176 DeleteCriticalSection (&finalizer_mutex);
1181 /* Null GC dummy functions */
1183 mono_gc_finalize_notify (void)
1187 void mono_gc_init (void)
1189 InitializeCriticalSection (&handle_section);
1192 void mono_gc_cleanup (void)
1199 mono_gc_is_finalizer_internal_thread (MonoInternalThread *thread)
1201 return thread == gc_thread;
1205 * mono_gc_is_finalizer_thread:
1206 * @thread: the thread to test.
1208 * In Mono objects are finalized asynchronously on a separate thread.
1209 * This routine tests whether the @thread argument represents the
1210 * finalization thread.
1212 * Returns true if @thread is the finalization thread.
1215 mono_gc_is_finalizer_thread (MonoThread *thread)
1217 return mono_gc_is_finalizer_internal_thread (thread->internal_thread);
1220 #if defined(__MACH__)
1221 static pthread_t mach_exception_thread;
1224 mono_gc_register_mach_exception_thread (pthread_t thread)
1226 mach_exception_thread = thread;
1230 mono_gc_get_mach_exception_thread (void)
1232 return mach_exception_thread;
1237 * mono_gc_parse_environment_string_extract_number:
1239 * @str: points to the first digit of the number
1240 * @out: pointer to the variable that will receive the value
1242 * Tries to extract a number from the passed string, taking in to account m, k
1245 * Returns true if passing was successful
1248 mono_gc_parse_environment_string_extract_number (const char *str, glong *out)
1251 int len = strlen (str), shift = 0;
1253 gboolean is_suffix = FALSE;
1256 switch (str [len - 1]) {
1267 suffix = str [len - 1];
1272 val = strtol (str, &endptr, 10);
1274 if ((errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
1275 || (errno != 0 && val == 0) || (endptr == str))
1279 if (*(endptr + 1)) /* Invalid string. */
1288 #ifndef HAVE_SGEN_GC
1290 mono_gc_alloc_mature (MonoVTable *vtable)
1292 return mono_object_new_specific (vtable);