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)
14 #include <mono/metadata/gc-internal.h>
15 #include <mono/metadata/mono-gc.h>
16 #include <mono/metadata/threads.h>
17 #include <mono/metadata/tabledefs.h>
18 #include <mono/metadata/exception.h>
19 #include <mono/metadata/profiler-private.h>
20 #include <mono/metadata/domain-internals.h>
21 #include <mono/metadata/class-internals.h>
22 #include <mono/metadata/metadata-internals.h>
23 #include <mono/metadata/mono-mlist.h>
24 #include <mono/metadata/threadpool.h>
25 #include <mono/metadata/threads-types.h>
26 #include <mono/utils/mono-logger-internal.h>
27 #include <mono/metadata/gc-internal.h>
28 #include <mono/metadata/marshal.h> /* for mono_delegate_free_ftnptr () */
29 #include <mono/metadata/attach.h>
30 #include <mono/utils/mono-semaphore.h>
36 typedef struct DomainFinalizationReq
{
39 } DomainFinalizationReq
;
41 #ifdef PLATFORM_WINCE /* FIXME: add accessors to gc.dll API */
42 extern void (*__imp_GC_finalizer_notifier
)(void);
43 #define GC_finalizer_notifier __imp_GC_finalizer_notifier
44 extern int __imp_GC_finalize_on_demand
;
45 #define GC_finalize_on_demand __imp_GC_finalize_on_demand
48 static gboolean gc_disabled
= FALSE
;
50 static gboolean finalizing_root_domain
= FALSE
;
52 #define mono_finalizer_lock() EnterCriticalSection (&finalizer_mutex)
53 #define mono_finalizer_unlock() LeaveCriticalSection (&finalizer_mutex)
54 static CRITICAL_SECTION finalizer_mutex
;
56 static GSList
*domains_to_finalize
= NULL
;
57 static MonoMList
*threads_to_finalize
= NULL
;
59 static MonoInternalThread
*gc_thread
;
61 static void object_register_finalizer (MonoObject
*obj
, void (*callback
)(void *, void*));
63 static void mono_gchandle_set_target (guint32 gchandle
, MonoObject
*obj
);
66 static HANDLE pending_done_event
;
67 static HANDLE shutdown_event
;
71 add_thread_to_finalize (MonoInternalThread
*thread
)
73 mono_finalizer_lock ();
74 if (!threads_to_finalize
)
75 MONO_GC_REGISTER_ROOT (threads_to_finalize
);
76 threads_to_finalize
= mono_mlist_append (threads_to_finalize
, (MonoObject
*)thread
);
77 mono_finalizer_unlock ();
80 static gboolean suspend_finalizers
= FALSE
;
82 * actually, we might want to queue the finalize requests in a separate thread,
83 * but we need to be careful about the execution domain of the thread...
86 mono_gc_run_finalize (void *obj
, void *data
)
88 MonoObject
*exc
= NULL
;
93 MonoMethod
* finalizer
= NULL
;
94 MonoDomain
*caller_domain
= mono_domain_get ();
96 RuntimeInvokeFunction runtime_invoke
;
97 GSList
*l
, *refs
= NULL
;
99 o
= (MonoObject
*)((char*)obj
+ GPOINTER_TO_UINT (data
));
101 if (suspend_finalizers
)
104 domain
= o
->vtable
->domain
;
107 mono_domain_finalizers_lock (domain
);
109 o2
= g_hash_table_lookup (domain
->finalizable_objects_hash
, o
);
111 refs
= mono_gc_remove_weak_track_object (domain
, o
);
113 mono_domain_finalizers_unlock (domain
);
116 /* Already finalized somehow */
122 * Support for GCHandles of type WeakTrackResurrection:
124 * Its not exactly clear how these are supposed to work, or how their
125 * semantics can be implemented. We only implement one crucial thing:
126 * these handles are only cleared after the finalizer has ran.
128 for (l
= refs
; l
; l
= l
->next
) {
129 guint32 gchandle
= GPOINTER_TO_UINT (l
->data
);
131 mono_gchandle_set_target (gchandle
, o
);
137 /* make sure the finalizer is not called again if the object is resurrected */
138 object_register_finalizer (obj
, NULL
);
140 if (o
->vtable
->klass
== mono_defaults
.internal_thread_class
) {
141 MonoInternalThread
*t
= (MonoInternalThread
*)o
;
143 if (mono_gc_is_finalizer_internal_thread (t
))
144 /* Avoid finalizing ourselves */
147 if (t
->threadpool_thread
&& finalizing_root_domain
) {
148 /* Don't finalize threadpool threads when
149 shutting down - they're finalized when the
150 threadpool shuts down. */
151 add_thread_to_finalize (t
);
156 if (o
->vtable
->klass
->image
== mono_defaults
.corlib
&& !strcmp (o
->vtable
->klass
->name
, "DynamicMethod") && finalizing_root_domain
) {
158 * These can't be finalized during unloading/shutdown, since that would
159 * free the native code which can still be referenced by other
161 * FIXME: This is not perfect, objects dying at the same time as
162 * dynamic methods can still reference them even when !shutdown.
167 if (mono_runtime_get_no_exec ())
170 /* speedup later... and use a timeout */
171 /* g_print ("Finalize run on %p %s.%s\n", o, mono_object_class (o)->name_space, mono_object_class (o)->name); */
173 /* Use _internal here, since this thread can enter a doomed appdomain */
174 mono_domain_set_internal (mono_object_domain (o
));
176 /* delegates that have a native function pointer allocated are
177 * registered for finalization, but they don't have a Finalize
178 * method, because in most cases it's not needed and it's just a waste.
180 if (o
->vtable
->klass
->delegate
) {
181 MonoDelegate
* del
= (MonoDelegate
*)o
;
182 if (del
->delegate_trampoline
)
183 mono_delegate_free_ftnptr ((MonoDelegate
*)o
);
184 mono_domain_set_internal (caller_domain
);
188 finalizer
= mono_class_get_finalizer (o
->vtable
->klass
);
191 /* If object has a CCW but has no finalizer, it was only
192 * registered for finalization in order to free the CCW.
193 * Else it needs the regular finalizer run.
194 * FIXME: what to do about ressurection and suppression
195 * of finalizer on object with CCW.
197 if (mono_marshal_free_ccw (o
) && !finalizer
) {
198 mono_domain_set_internal (caller_domain
);
204 * To avoid the locking plus the other overhead of mono_runtime_invoke (),
205 * create and precompile a wrapper which calls the finalize method using
208 if (!domain
->finalize_runtime_invoke
) {
209 MonoMethod
*invoke
= mono_marshal_get_runtime_invoke (mono_class_get_method_from_name_flags (mono_defaults
.object_class
, "Finalize", 0, 0), TRUE
);
211 domain
->finalize_runtime_invoke
= mono_compile_method (invoke
);
214 runtime_invoke
= domain
->finalize_runtime_invoke
;
216 mono_runtime_class_init (o
->vtable
);
218 runtime_invoke (o
, NULL
, &exc
, NULL
);
221 /* fixme: do something useful */
224 mono_domain_set_internal (caller_domain
);
228 mono_gc_finalize_threadpool_threads (void)
230 while (threads_to_finalize
) {
231 MonoInternalThread
*thread
= (MonoInternalThread
*) mono_mlist_get_data (threads_to_finalize
);
233 /* Force finalization of the thread. */
234 thread
->threadpool_thread
= FALSE
;
235 mono_object_register_finalizer ((MonoObject
*)thread
);
237 mono_gc_run_finalize (thread
, NULL
);
239 threads_to_finalize
= mono_mlist_next (threads_to_finalize
);
244 mono_gc_out_of_memory (size_t size
)
247 * we could allocate at program startup some memory that we could release
248 * back to the system at this point if we're really low on memory (ie, size is
249 * lower than the memory we set apart)
251 mono_raise_exception (mono_domain_get ()->out_of_memory_ex
);
257 * Some of our objects may point to a different address than the address returned by GC_malloc()
258 * (because of the GetHashCode hack), but we need to pass the real address to register_finalizer.
259 * This also means that in the callback we need to adjust the pointer to get back the real
261 * We also need to be consistent in the use of the GC_debug* variants of malloc and register_finalizer,
262 * since that, too, can cause the underlying pointer to be offset.
265 object_register_finalizer (MonoObject
*obj
, void (*callback
)(void *, void*))
272 mono_raise_exception (mono_get_exception_argument_null ("obj"));
274 domain
= obj
->vtable
->domain
;
277 /* This assertion is not valid when GC_DEBUG is defined */
278 g_assert (GC_base (obj
) == (char*)obj
- offset
);
281 if (mono_domain_is_unloading (domain
) && (callback
!= NULL
))
283 * Can't register finalizers in a dying appdomain, since they
284 * could be invoked after the appdomain has been unloaded.
288 mono_domain_finalizers_lock (domain
);
291 g_hash_table_insert (domain
->finalizable_objects_hash
, obj
, obj
);
293 g_hash_table_remove (domain
->finalizable_objects_hash
, obj
);
295 mono_domain_finalizers_unlock (domain
);
297 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj
- offset
, callback
, GUINT_TO_POINTER (offset
), NULL
, NULL
);
298 #elif defined(HAVE_SGEN_GC)
300 mono_raise_exception (mono_get_exception_argument_null ("obj"));
302 mono_gc_register_for_finalization (obj
, callback
);
307 * mono_object_register_finalizer:
308 * @obj: object to register
310 * Records that object @obj has a finalizer, this will call the
311 * Finalize method when the garbage collector disposes the object.
315 mono_object_register_finalizer (MonoObject
*obj
)
317 /* g_print ("Registered finalizer on %p %s.%s\n", obj, mono_object_class (obj)->name_space, mono_object_class (obj)->name); */
318 object_register_finalizer (obj
, mono_gc_run_finalize
);
322 * mono_domain_finalize:
323 * @domain: the domain to finalize
324 * @timeout: msects to wait for the finalization to complete, -1 to wait indefinitely
326 * Request finalization of all finalizable objects inside @domain. Wait
327 * @timeout msecs for the finalization to complete.
329 * Returns: TRUE if succeeded, FALSE if there was a timeout
333 mono_domain_finalize (MonoDomain
*domain
, guint32 timeout
)
335 DomainFinalizationReq
*req
;
339 if (mono_thread_internal_current () == gc_thread
)
340 /* We are called from inside a finalizer, not much we can do here */
344 * No need to create another thread 'cause the finalizer thread
345 * is still working and will take care of running the finalizers
352 mono_gc_collect (mono_gc_max_generation ());
354 done_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
355 if (done_event
== NULL
) {
359 req
= g_new0 (DomainFinalizationReq
, 1);
360 req
->domain
= domain
;
361 req
->done_event
= done_event
;
363 if (domain
== mono_get_root_domain ())
364 finalizing_root_domain
= TRUE
;
366 mono_finalizer_lock ();
368 domains_to_finalize
= g_slist_append (domains_to_finalize
, req
);
370 mono_finalizer_unlock ();
372 /* Tell the finalizer thread to finalize this appdomain */
373 mono_gc_finalize_notify ();
378 res
= WaitForSingleObjectEx (done_event
, timeout
, TRUE
);
380 /* printf ("WAIT RES: %d.\n", res); */
381 if (res
== WAIT_TIMEOUT
) {
382 /* We leak the handle here */
386 CloseHandle (done_event
);
388 if (domain
== mono_get_root_domain ()) {
389 mono_thread_pool_cleanup ();
390 mono_gc_finalize_threadpool_threads ();
395 /* We don't support domain finalization without a GC */
401 ves_icall_System_GC_InternalCollect (int generation
)
403 mono_gc_collect (generation
);
407 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection
)
412 mono_gc_collect (mono_gc_max_generation ());
413 return mono_gc_get_used_size ();
417 ves_icall_System_GC_KeepAlive (MonoObject
*obj
)
427 ves_icall_System_GC_ReRegisterForFinalize (MonoObject
*obj
)
430 mono_raise_exception (mono_get_exception_argument_null ("obj"));
432 object_register_finalizer (obj
, mono_gc_run_finalize
);
436 ves_icall_System_GC_SuppressFinalize (MonoObject
*obj
)
439 mono_raise_exception (mono_get_exception_argument_null ("obj"));
441 /* delegates have no finalizers, but we register them to deal with the
442 * unmanaged->managed trampoline. We don't let the user suppress it
443 * otherwise we'd leak it.
445 if (obj
->vtable
->klass
->delegate
)
448 /* FIXME: Need to handle case where obj has COM Callable Wrapper
449 * generated for it that needs cleaned up, but user wants to suppress
450 * their derived object finalizer. */
452 object_register_finalizer (obj
, NULL
);
456 ves_icall_System_GC_WaitForPendingFinalizers (void)
459 if (!mono_gc_pending_finalizers ())
462 if (mono_thread_internal_current () == gc_thread
)
463 /* Avoid deadlocks */
466 ResetEvent (pending_done_event
);
467 mono_gc_finalize_notify ();
468 /* g_print ("Waiting for pending finalizers....\n"); */
469 WaitForSingleObjectEx (pending_done_event
, INFINITE
, TRUE
);
470 /* g_print ("Done pending....\n"); */
475 ves_icall_System_GC_register_ephemeron_array (MonoObject
*array
)
478 if (!mono_gc_ephemeron_array_add (array
))
479 mono_raise_exception (mono_object_domain (array
)->out_of_memory_ex
);
484 #define mono_allocator_lock() EnterCriticalSection (&allocator_section)
485 #define mono_allocator_unlock() LeaveCriticalSection (&allocator_section)
486 static CRITICAL_SECTION allocator_section
;
487 static CRITICAL_SECTION handle_section
;
496 static HandleType
mono_gchandle_get_type (guint32 gchandle
);
499 ves_icall_System_GCHandle_GetTarget (guint32 handle
)
501 return mono_gchandle_get_target (handle
);
505 * if type == -1, change the target of the handle, otherwise allocate a new handle.
508 ves_icall_System_GCHandle_GetTargetHandle (MonoObject
*obj
, guint32 handle
, gint32 type
)
511 mono_gchandle_set_target (handle
, obj
);
512 /* the handle doesn't change */
517 return mono_gchandle_new_weakref (obj
, FALSE
);
518 case HANDLE_WEAK_TRACK
:
519 return mono_gchandle_new_weakref (obj
, TRUE
);
521 return mono_gchandle_new (obj
, FALSE
);
523 return mono_gchandle_new (obj
, TRUE
);
525 g_assert_not_reached ();
531 ves_icall_System_GCHandle_FreeHandle (guint32 handle
)
533 mono_gchandle_free (handle
);
537 ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle
)
541 if (mono_gchandle_get_type (handle
) != HANDLE_PINNED
)
543 obj
= mono_gchandle_get_target (handle
);
545 MonoClass
*klass
= mono_object_class (obj
);
546 if (klass
== mono_defaults
.string_class
) {
547 return mono_string_chars ((MonoString
*)obj
);
548 } else if (klass
->rank
) {
549 return mono_array_addr ((MonoArray
*)obj
, char, 0);
551 /* the C# code will check and throw the exception */
552 /* FIXME: missing !klass->blittable test, see bug #61134 */
553 if ((klass
->flags
& TYPE_ATTRIBUTE_LAYOUT_MASK
) == TYPE_ATTRIBUTE_AUTO_LAYOUT
)
555 return (char*)obj
+ sizeof (MonoObject
);
566 guint slot_hint
: 24; /* starting slot for search */
567 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
568 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
572 /* weak and weak-track arrays will be allocated in malloc memory
574 static HandleData gc_handles
[] = {
575 {NULL
, NULL
, 0, HANDLE_WEAK
, 0},
576 {NULL
, NULL
, 0, HANDLE_WEAK_TRACK
, 0},
577 {NULL
, NULL
, 0, HANDLE_NORMAL
, 0},
578 {NULL
, NULL
, 0, HANDLE_PINNED
, 0}
581 #define lock_handles(handles) EnterCriticalSection (&handle_section)
582 #define unlock_handles(handles) LeaveCriticalSection (&handle_section)
585 find_first_unset (guint32 bitmap
)
588 for (i
= 0; i
< 32; ++i
) {
589 if (!(bitmap
& (1 << i
)))
596 alloc_handle (HandleData
*handles
, MonoObject
*obj
, gboolean track
)
599 lock_handles (handles
);
600 if (!handles
->size
) {
602 if (handles
->type
> HANDLE_WEAK_TRACK
) {
603 handles
->entries
= mono_gc_alloc_fixed (sizeof (gpointer
) * handles
->size
, NULL
);
605 handles
->entries
= g_malloc0 (sizeof (gpointer
) * handles
->size
);
606 handles
->domain_ids
= g_malloc0 (sizeof (guint16
) * handles
->size
);
608 handles
->bitmap
= g_malloc0 (handles
->size
/ 8);
611 for (slot
= handles
->slot_hint
; slot
< handles
->size
/ 32; ++slot
) {
612 if (handles
->bitmap
[slot
] != 0xffffffff) {
613 i
= find_first_unset (handles
->bitmap
[slot
]);
614 handles
->slot_hint
= slot
;
618 if (i
== -1 && handles
->slot_hint
!= 0) {
619 for (slot
= 0; slot
< handles
->slot_hint
; ++slot
) {
620 if (handles
->bitmap
[slot
] != 0xffffffff) {
621 i
= find_first_unset (handles
->bitmap
[slot
]);
622 handles
->slot_hint
= slot
;
629 guint32 new_size
= handles
->size
* 2; /* always double: we memset to 0 based on this below */
631 /* resize and copy the bitmap */
632 new_bitmap
= g_malloc0 (new_size
/ 8);
633 memcpy (new_bitmap
, handles
->bitmap
, handles
->size
/ 8);
634 g_free (handles
->bitmap
);
635 handles
->bitmap
= new_bitmap
;
637 /* resize and copy the entries */
638 if (handles
->type
> HANDLE_WEAK_TRACK
) {
643 /* Create a GC descriptor */
644 gc_bitmap
= g_malloc (new_size
/ 8);
645 memset (gc_bitmap
, 0xff, new_size
/ 8);
646 descr
= mono_gc_make_descr_from_bitmap (gc_bitmap
, new_size
);
649 entries
= mono_gc_alloc_fixed (sizeof (gpointer
) * new_size
, descr
);
650 memcpy (entries
, handles
->entries
, sizeof (gpointer
) * handles
->size
);
652 mono_gc_free_fixed (handles
->entries
);
653 handles
->entries
= entries
;
657 domain_ids
= g_malloc0 (sizeof (guint16
) * new_size
);
658 entries
= g_malloc (sizeof (gpointer
) * new_size
);
659 /* we disable GC because we could lose some disappearing link updates */
661 memcpy (entries
, handles
->entries
, sizeof (gpointer
) * handles
->size
);
662 memset (entries
+ handles
->size
, 0, sizeof (gpointer
) * handles
->size
);
663 memcpy (domain_ids
, handles
->domain_ids
, sizeof (guint16
) * handles
->size
);
664 for (i
= 0; i
< handles
->size
; ++i
) {
665 MonoObject
*obj
= mono_gc_weak_link_get (&(handles
->entries
[i
]));
666 if (handles
->entries
[i
])
667 mono_gc_weak_link_remove (&(handles
->entries
[i
]));
668 /*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]);*/
670 mono_gc_weak_link_add (&(entries
[i
]), obj
, track
);
673 g_free (handles
->entries
);
674 g_free (handles
->domain_ids
);
675 handles
->entries
= entries
;
676 handles
->domain_ids
= domain_ids
;
680 /* set i and slot to the next free position */
682 slot
= (handles
->size
+ 1) / 32;
683 handles
->slot_hint
= handles
->size
+ 1;
684 handles
->size
= new_size
;
686 handles
->bitmap
[slot
] |= 1 << i
;
687 slot
= slot
* 32 + i
;
688 handles
->entries
[slot
] = obj
;
689 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
691 mono_gc_weak_link_add (&(handles
->entries
[slot
]), obj
, track
);
694 mono_perfcounters
->gc_num_handles
++;
695 unlock_handles (handles
);
696 /*g_print ("allocated entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
697 return (slot
<< 3) | (handles
->type
+ 1);
702 * @obj: managed object to get a handle for
703 * @pinned: whether the object should be pinned
705 * This returns a handle that wraps the object, this is used to keep a
706 * reference to a managed object from the unmanaged world and preventing the
707 * object from being disposed.
709 * If @pinned is false the address of the object can not be obtained, if it is
710 * true the address of the object can be obtained. This will also pin the
711 * object so it will not be possible by a moving garbage collector to move the
714 * Returns: a handle that can be used to access the object from
718 mono_gchandle_new (MonoObject
*obj
, gboolean pinned
)
720 return alloc_handle (&gc_handles
[pinned
? HANDLE_PINNED
: HANDLE_NORMAL
], obj
, FALSE
);
724 * mono_gchandle_new_weakref:
725 * @obj: managed object to get a handle for
726 * @pinned: whether the object should be pinned
728 * This returns a weak handle that wraps the object, this is used to
729 * keep a reference to a managed object from the unmanaged world.
730 * Unlike the mono_gchandle_new the object can be reclaimed by the
731 * garbage collector. In this case the value of the GCHandle will be
734 * If @pinned is false the address of the object can not be obtained, if it is
735 * true the address of the object can be obtained. This will also pin the
736 * object so it will not be possible by a moving garbage collector to move the
739 * Returns: a handle that can be used to access the object from
743 mono_gchandle_new_weakref (MonoObject
*obj
, gboolean track_resurrection
)
745 guint32 handle
= alloc_handle (&gc_handles
[track_resurrection
? HANDLE_WEAK_TRACK
: HANDLE_WEAK
], obj
, track_resurrection
);
748 if (track_resurrection
)
749 mono_gc_add_weak_track_handle (obj
, handle
);
756 mono_gchandle_get_type (guint32 gchandle
)
758 guint type
= (gchandle
& 7) - 1;
764 * mono_gchandle_get_target:
765 * @gchandle: a GCHandle's handle.
767 * The handle was previously created by calling mono_gchandle_new or
768 * mono_gchandle_new_weakref.
770 * Returns a pointer to the MonoObject represented by the handle or
771 * NULL for a collected object if using a weakref handle.
774 mono_gchandle_get_target (guint32 gchandle
)
776 guint slot
= gchandle
>> 3;
777 guint type
= (gchandle
& 7) - 1;
778 HandleData
*handles
= &gc_handles
[type
];
779 MonoObject
*obj
= NULL
;
782 lock_handles (handles
);
783 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
784 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
785 obj
= mono_gc_weak_link_get (&handles
->entries
[slot
]);
787 obj
= handles
->entries
[slot
];
790 /* print a warning? */
792 unlock_handles (handles
);
793 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
798 mono_gchandle_set_target (guint32 gchandle
, MonoObject
*obj
)
800 guint slot
= gchandle
>> 3;
801 guint type
= (gchandle
& 7) - 1;
802 HandleData
*handles
= &gc_handles
[type
];
803 MonoObject
*old_obj
= NULL
;
807 lock_handles (handles
);
808 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
809 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
810 old_obj
= handles
->entries
[slot
];
811 if (handles
->entries
[slot
])
812 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
814 mono_gc_weak_link_add (&handles
->entries
[slot
], obj
, handles
->type
== HANDLE_WEAK_TRACK
);
816 handles
->entries
[slot
] = obj
;
819 /* print a warning? */
821 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
822 unlock_handles (handles
);
825 if (type
== HANDLE_WEAK_TRACK
)
826 mono_gc_change_weak_track_handle (old_obj
, obj
, gchandle
);
831 * mono_gchandle_is_in_domain:
832 * @gchandle: a GCHandle's handle.
833 * @domain: An application domain.
835 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
838 mono_gchandle_is_in_domain (guint32 gchandle
, MonoDomain
*domain
)
840 guint slot
= gchandle
>> 3;
841 guint type
= (gchandle
& 7) - 1;
842 HandleData
*handles
= &gc_handles
[type
];
843 gboolean result
= FALSE
;
846 lock_handles (handles
);
847 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
848 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
849 result
= domain
->domain_id
== handles
->domain_ids
[slot
];
852 obj
= handles
->entries
[slot
];
856 result
= domain
== mono_object_domain (obj
);
859 /* print a warning? */
861 unlock_handles (handles
);
866 * mono_gchandle_free:
867 * @gchandle: a GCHandle's handle.
869 * Frees the @gchandle handle. If there are no outstanding
870 * references, the garbage collector can reclaim the memory of the
874 mono_gchandle_free (guint32 gchandle
)
876 guint slot
= gchandle
>> 3;
877 guint type
= (gchandle
& 7) - 1;
878 HandleData
*handles
= &gc_handles
[type
];
882 if (type
== HANDLE_WEAK_TRACK
)
883 mono_gc_remove_weak_track_handle (gchandle
);
886 lock_handles (handles
);
887 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
888 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
889 if (handles
->entries
[slot
])
890 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
892 handles
->entries
[slot
] = NULL
;
894 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
896 /* print a warning? */
898 mono_perfcounters
->gc_num_handles
--;
899 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
900 unlock_handles (handles
);
904 * mono_gchandle_free_domain:
905 * @domain: domain that is unloading
907 * Function used internally to cleanup any GC handle for objects belonging
908 * to the specified domain during appdomain unload.
911 mono_gchandle_free_domain (MonoDomain
*domain
)
915 for (type
= 0; type
< 3; ++type
) {
917 HandleData
*handles
= &gc_handles
[type
];
918 lock_handles (handles
);
919 for (slot
= 0; slot
< handles
->size
; ++slot
) {
920 if (!(handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32))))
922 if (type
<= HANDLE_WEAK_TRACK
) {
923 if (domain
->domain_id
== handles
->domain_ids
[slot
]) {
924 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
925 if (handles
->entries
[slot
])
926 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
929 if (handles
->entries
[slot
] && mono_object_domain (handles
->entries
[slot
]) == domain
) {
930 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
931 handles
->entries
[slot
] = NULL
;
935 unlock_handles (handles
);
941 GCHandle_CheckCurrentDomain (guint32 gchandle
)
943 return mono_gchandle_is_in_domain (gchandle
, mono_domain_get ());
948 #ifdef MONO_HAS_SEMAPHORES
949 static MonoSemType finalizer_sem
;
951 static HANDLE finalizer_event
;
952 static volatile gboolean finished
=FALSE
;
955 mono_gc_finalize_notify (void)
958 g_message ( "%s: prodding finalizer", __func__
);
961 #ifdef MONO_HAS_SEMAPHORES
962 MONO_SEM_POST (&finalizer_sem
);
964 SetEvent (finalizer_event
);
971 collect_objects (gpointer key
, gpointer value
, gpointer user_data
)
973 GPtrArray
*arr
= (GPtrArray
*)user_data
;
974 g_ptr_array_add (arr
, key
);
980 * finalize_domain_objects:
982 * Run the finalizers of all finalizable objects in req->domain.
985 finalize_domain_objects (DomainFinalizationReq
*req
)
987 MonoDomain
*domain
= req
->domain
;
990 while (g_hash_table_size (domain
->finalizable_objects_hash
) > 0) {
994 * Since the domain is unloading, nobody is allowed to put
995 * new entries into the hash table. But finalize_object might
996 * remove entries from the hash table, so we make a copy.
998 objs
= g_ptr_array_new ();
999 g_hash_table_foreach (domain
->finalizable_objects_hash
, collect_objects
, objs
);
1000 /* printf ("FINALIZING %d OBJECTS.\n", objs->len); */
1002 for (i
= 0; i
< objs
->len
; ++i
) {
1003 MonoObject
*o
= (MonoObject
*)g_ptr_array_index (objs
, i
);
1004 /* FIXME: Avoid finalizing threads, etc */
1005 mono_gc_run_finalize (o
, 0);
1008 g_ptr_array_free (objs
, TRUE
);
1010 #elif defined(HAVE_SGEN_GC)
1011 #define NUM_FOBJECTS 64
1012 MonoObject
*to_finalize
[NUM_FOBJECTS
];
1014 while ((count
= mono_gc_finalizers_for_domain (domain
, to_finalize
, NUM_FOBJECTS
))) {
1016 for (i
= 0; i
< count
; ++i
) {
1017 mono_gc_run_finalize (to_finalize
[i
], 0);
1022 /* Process finalizers which are already in the queue */
1023 mono_gc_invoke_finalizers ();
1025 /* printf ("DONE.\n"); */
1026 SetEvent (req
->done_event
);
1028 /* The event is closed in mono_domain_finalize if we get here */
1033 finalizer_thread (gpointer unused
)
1036 /* Wait to be notified that there's at least one
1040 g_assert (mono_domain_get () == mono_get_root_domain ());
1042 #ifdef MONO_HAS_SEMAPHORES
1043 MONO_SEM_WAIT (&finalizer_sem
);
1045 /* Use alertable=FALSE since we will be asked to exit using the event too */
1046 WaitForSingleObjectEx (finalizer_event
, INFINITE
, FALSE
);
1049 #ifndef DISABLE_ATTACH
1050 mono_attach_maybe_start ();
1053 if (domains_to_finalize
) {
1054 mono_finalizer_lock ();
1055 if (domains_to_finalize
) {
1056 DomainFinalizationReq
*req
= domains_to_finalize
->data
;
1057 domains_to_finalize
= g_slist_remove (domains_to_finalize
, req
);
1058 mono_finalizer_unlock ();
1060 finalize_domain_objects (req
);
1062 mono_finalizer_unlock ();
1066 /* If finished == TRUE, mono_gc_cleanup has been called (from mono_runtime_cleanup),
1067 * before the domain is unloaded.
1069 mono_gc_invoke_finalizers ();
1071 SetEvent (pending_done_event
);
1074 SetEvent (shutdown_event
);
1079 #define GC_dont_gc 0
1085 InitializeCriticalSection (&handle_section
);
1086 InitializeCriticalSection (&allocator_section
);
1088 InitializeCriticalSection (&finalizer_mutex
);
1090 MONO_GC_REGISTER_ROOT (gc_handles
[HANDLE_NORMAL
].entries
);
1091 MONO_GC_REGISTER_ROOT (gc_handles
[HANDLE_PINNED
].entries
);
1093 mono_gc_base_init ();
1095 if (GC_dont_gc
|| g_getenv ("GC_DONT_GC")) {
1100 finalizer_event
= CreateEvent (NULL
, FALSE
, FALSE
, NULL
);
1101 pending_done_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
1102 shutdown_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
1103 if (finalizer_event
== NULL
|| pending_done_event
== NULL
|| shutdown_event
== NULL
) {
1104 g_assert_not_reached ();
1106 #ifdef MONO_HAS_SEMAPHORES
1107 MONO_SEM_INIT (&finalizer_sem
, 0);
1110 gc_thread
= mono_thread_create_internal (mono_domain_get (), finalizer_thread
, NULL
, FALSE
);
1114 mono_gc_cleanup (void)
1117 g_message ("%s: cleaning up finalizer", __func__
);
1121 ResetEvent (shutdown_event
);
1123 if (mono_thread_internal_current () != gc_thread
) {
1124 mono_gc_finalize_notify ();
1125 /* Finishing the finalizer thread, so wait a little bit... */
1126 /* MS seems to wait for about 2 seconds */
1127 if (WaitForSingleObjectEx (shutdown_event
, 2000, FALSE
) == WAIT_TIMEOUT
) {
1130 /* Set a flag which the finalizer thread can check */
1131 suspend_finalizers
= TRUE
;
1133 /* Try to abort the thread, in the hope that it is running managed code */
1134 mono_thread_internal_stop (gc_thread
);
1136 /* Wait for it to stop */
1137 ret
= WaitForSingleObjectEx (gc_thread
->handle
, 100, TRUE
);
1139 if (ret
== WAIT_TIMEOUT
) {
1141 * The finalizer thread refused to die. There is not much we
1142 * can do here, since the runtime is shutting down so the
1143 * state the finalizer thread depends on will vanish.
1145 g_warning ("Shutting down finalizer thread timed out.");
1148 * FIXME: On unix, when the above wait returns, the thread
1149 * might still be running io-layer code, or pthreads code.
1157 #ifdef HAVE_BOEHM_GC
1158 GC_finalizer_notifier
= NULL
;
1162 DeleteCriticalSection (&handle_section
);
1163 DeleteCriticalSection (&allocator_section
);
1164 DeleteCriticalSection (&finalizer_mutex
);
1169 /* Null GC dummy functions */
1171 mono_gc_finalize_notify (void)
1175 void mono_gc_init (void)
1177 InitializeCriticalSection (&handle_section
);
1180 void mono_gc_cleanup (void)
1187 mono_gc_is_finalizer_internal_thread (MonoInternalThread
*thread
)
1189 return thread
== gc_thread
;
1193 * mono_gc_is_finalizer_thread:
1194 * @thread: the thread to test.
1196 * In Mono objects are finalized asynchronously on a separate thread.
1197 * This routine tests whether the @thread argument represents the
1198 * finalization thread.
1200 * Returns true if @thread is the finalization thread.
1203 mono_gc_is_finalizer_thread (MonoThread
*thread
)
1205 return mono_gc_is_finalizer_internal_thread (thread
->internal_thread
);