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"));
304 mono_gc_register_for_finalization (obj
, callback
);
309 * mono_object_register_finalizer:
310 * @obj: object to register
312 * Records that object @obj has a finalizer, this will call the
313 * Finalize method when the garbage collector disposes the object.
317 mono_object_register_finalizer (MonoObject
*obj
)
319 /* g_print ("Registered finalizer on %p %s.%s\n", obj, mono_object_class (obj)->name_space, mono_object_class (obj)->name); */
320 object_register_finalizer (obj
, mono_gc_run_finalize
);
324 * mono_domain_finalize:
325 * @domain: the domain to finalize
326 * @timeout: msects to wait for the finalization to complete, -1 to wait indefinitely
328 * Request finalization of all finalizable objects inside @domain. Wait
329 * @timeout msecs for the finalization to complete.
331 * Returns: TRUE if succeeded, FALSE if there was a timeout
335 mono_domain_finalize (MonoDomain
*domain
, guint32 timeout
)
337 DomainFinalizationReq
*req
;
341 if (mono_thread_internal_current () == gc_thread
)
342 /* We are called from inside a finalizer, not much we can do here */
346 * No need to create another thread 'cause the finalizer thread
347 * is still working and will take care of running the finalizers
354 mono_gc_collect (mono_gc_max_generation ());
356 done_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
357 if (done_event
== NULL
) {
361 req
= g_new0 (DomainFinalizationReq
, 1);
362 req
->domain
= domain
;
363 req
->done_event
= done_event
;
365 if (domain
== mono_get_root_domain ())
366 finalizing_root_domain
= TRUE
;
368 mono_finalizer_lock ();
370 domains_to_finalize
= g_slist_append (domains_to_finalize
, req
);
372 mono_finalizer_unlock ();
374 /* Tell the finalizer thread to finalize this appdomain */
375 mono_gc_finalize_notify ();
380 res
= WaitForSingleObjectEx (done_event
, timeout
, TRUE
);
382 /* printf ("WAIT RES: %d.\n", res); */
383 if (res
== WAIT_TIMEOUT
) {
384 /* We leak the handle here */
388 CloseHandle (done_event
);
390 if (domain
== mono_get_root_domain ()) {
391 mono_thread_pool_cleanup ();
392 mono_gc_finalize_threadpool_threads ();
397 /* We don't support domain finalization without a GC */
403 ves_icall_System_GC_InternalCollect (int generation
)
405 mono_gc_collect (generation
);
409 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection
)
414 mono_gc_collect (mono_gc_max_generation ());
415 return mono_gc_get_used_size ();
419 ves_icall_System_GC_KeepAlive (MonoObject
*obj
)
429 ves_icall_System_GC_ReRegisterForFinalize (MonoObject
*obj
)
432 mono_raise_exception (mono_get_exception_argument_null ("obj"));
434 object_register_finalizer (obj
, mono_gc_run_finalize
);
438 ves_icall_System_GC_SuppressFinalize (MonoObject
*obj
)
441 mono_raise_exception (mono_get_exception_argument_null ("obj"));
443 /* delegates have no finalizers, but we register them to deal with the
444 * unmanaged->managed trampoline. We don't let the user suppress it
445 * otherwise we'd leak it.
447 if (obj
->vtable
->klass
->delegate
)
450 /* FIXME: Need to handle case where obj has COM Callable Wrapper
451 * generated for it that needs cleaned up, but user wants to suppress
452 * their derived object finalizer. */
454 object_register_finalizer (obj
, NULL
);
458 ves_icall_System_GC_WaitForPendingFinalizers (void)
461 if (!mono_gc_pending_finalizers ())
464 if (mono_thread_internal_current () == gc_thread
)
465 /* Avoid deadlocks */
468 ResetEvent (pending_done_event
);
469 mono_gc_finalize_notify ();
470 /* g_print ("Waiting for pending finalizers....\n"); */
471 WaitForSingleObjectEx (pending_done_event
, INFINITE
, TRUE
);
472 /* g_print ("Done pending....\n"); */
477 ves_icall_System_GC_register_ephemeron_array (MonoObject
*array
)
480 if (!mono_gc_ephemeron_array_add (array
))
481 mono_raise_exception (mono_object_domain (array
)->out_of_memory_ex
);
486 ves_icall_System_GC_get_ephemeron_tombstone (void)
488 return mono_domain_get ()->ephemeron_tombstone
;
491 #define mono_allocator_lock() EnterCriticalSection (&allocator_section)
492 #define mono_allocator_unlock() LeaveCriticalSection (&allocator_section)
493 static CRITICAL_SECTION allocator_section
;
494 static CRITICAL_SECTION handle_section
;
503 static HandleType
mono_gchandle_get_type (guint32 gchandle
);
506 ves_icall_System_GCHandle_GetTarget (guint32 handle
)
508 return mono_gchandle_get_target (handle
);
512 * if type == -1, change the target of the handle, otherwise allocate a new handle.
515 ves_icall_System_GCHandle_GetTargetHandle (MonoObject
*obj
, guint32 handle
, gint32 type
)
518 mono_gchandle_set_target (handle
, obj
);
519 /* the handle doesn't change */
524 return mono_gchandle_new_weakref (obj
, FALSE
);
525 case HANDLE_WEAK_TRACK
:
526 return mono_gchandle_new_weakref (obj
, TRUE
);
528 return mono_gchandle_new (obj
, FALSE
);
530 return mono_gchandle_new (obj
, TRUE
);
532 g_assert_not_reached ();
538 ves_icall_System_GCHandle_FreeHandle (guint32 handle
)
540 mono_gchandle_free (handle
);
544 ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle
)
548 if (mono_gchandle_get_type (handle
) != HANDLE_PINNED
)
550 obj
= mono_gchandle_get_target (handle
);
552 MonoClass
*klass
= mono_object_class (obj
);
553 if (klass
== mono_defaults
.string_class
) {
554 return mono_string_chars ((MonoString
*)obj
);
555 } else if (klass
->rank
) {
556 return mono_array_addr ((MonoArray
*)obj
, char, 0);
558 /* the C# code will check and throw the exception */
559 /* FIXME: missing !klass->blittable test, see bug #61134 */
560 if ((klass
->flags
& TYPE_ATTRIBUTE_LAYOUT_MASK
) == TYPE_ATTRIBUTE_AUTO_LAYOUT
)
562 return (char*)obj
+ sizeof (MonoObject
);
573 guint slot_hint
: 24; /* starting slot for search */
574 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
575 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
579 /* weak and weak-track arrays will be allocated in malloc memory
581 static HandleData gc_handles
[] = {
582 {NULL
, NULL
, 0, HANDLE_WEAK
, 0},
583 {NULL
, NULL
, 0, HANDLE_WEAK_TRACK
, 0},
584 {NULL
, NULL
, 0, HANDLE_NORMAL
, 0},
585 {NULL
, NULL
, 0, HANDLE_PINNED
, 0}
588 #define lock_handles(handles) EnterCriticalSection (&handle_section)
589 #define unlock_handles(handles) LeaveCriticalSection (&handle_section)
592 find_first_unset (guint32 bitmap
)
595 for (i
= 0; i
< 32; ++i
) {
596 if (!(bitmap
& (1 << i
)))
603 alloc_handle (HandleData
*handles
, MonoObject
*obj
, gboolean track
)
607 lock_handles (handles
);
608 if (!handles
->size
) {
610 if (handles
->type
> HANDLE_WEAK_TRACK
) {
611 handles
->entries
= mono_gc_alloc_fixed (sizeof (gpointer
) * handles
->size
, mono_gc_make_root_descr_all_refs (handles
->size
));
613 handles
->entries
= g_malloc0 (sizeof (gpointer
) * handles
->size
);
614 handles
->domain_ids
= g_malloc0 (sizeof (guint16
) * handles
->size
);
616 handles
->bitmap
= g_malloc0 (handles
->size
/ 8);
619 for (slot
= handles
->slot_hint
; slot
< handles
->size
/ 32; ++slot
) {
620 if (handles
->bitmap
[slot
] != 0xffffffff) {
621 i
= find_first_unset (handles
->bitmap
[slot
]);
622 handles
->slot_hint
= slot
;
626 if (i
== -1 && handles
->slot_hint
!= 0) {
627 for (slot
= 0; slot
< handles
->slot_hint
; ++slot
) {
628 if (handles
->bitmap
[slot
] != 0xffffffff) {
629 i
= find_first_unset (handles
->bitmap
[slot
]);
630 handles
->slot_hint
= slot
;
637 guint32 new_size
= handles
->size
* 2; /* always double: we memset to 0 based on this below */
639 /* resize and copy the bitmap */
640 new_bitmap
= g_malloc0 (new_size
/ 8);
641 memcpy (new_bitmap
, handles
->bitmap
, handles
->size
/ 8);
642 g_free (handles
->bitmap
);
643 handles
->bitmap
= new_bitmap
;
645 /* resize and copy the entries */
646 if (handles
->type
> HANDLE_WEAK_TRACK
) {
649 entries
= mono_gc_alloc_fixed (sizeof (gpointer
) * new_size
, mono_gc_make_root_descr_all_refs (new_size
));
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 res
= (slot
<< 3) | (handles
->type
+ 1);
698 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED
, handles
->type
, res
, obj
);
704 * @obj: managed object to get a handle for
705 * @pinned: whether the object should be pinned
707 * This returns a handle that wraps the object, this is used to keep a
708 * reference to a managed object from the unmanaged world and preventing the
709 * object from being disposed.
711 * If @pinned is false the address of the object can not be obtained, if it is
712 * true the address of the object can be obtained. This will also pin the
713 * object so it will not be possible by a moving garbage collector to move the
716 * Returns: a handle that can be used to access the object from
720 mono_gchandle_new (MonoObject
*obj
, gboolean pinned
)
722 return alloc_handle (&gc_handles
[pinned
? HANDLE_PINNED
: HANDLE_NORMAL
], obj
, FALSE
);
726 * mono_gchandle_new_weakref:
727 * @obj: managed object to get a handle for
728 * @pinned: whether the object should be pinned
730 * This returns a weak handle that wraps the object, this is used to
731 * keep a reference to a managed object from the unmanaged world.
732 * Unlike the mono_gchandle_new the object can be reclaimed by the
733 * garbage collector. In this case the value of the GCHandle will be
736 * If @pinned is false the address of the object can not be obtained, if it is
737 * true the address of the object can be obtained. This will also pin the
738 * object so it will not be possible by a moving garbage collector to move the
741 * Returns: a handle that can be used to access the object from
745 mono_gchandle_new_weakref (MonoObject
*obj
, gboolean track_resurrection
)
747 guint32 handle
= alloc_handle (&gc_handles
[track_resurrection
? HANDLE_WEAK_TRACK
: HANDLE_WEAK
], obj
, track_resurrection
);
750 if (track_resurrection
)
751 mono_gc_add_weak_track_handle (obj
, handle
);
758 mono_gchandle_get_type (guint32 gchandle
)
760 guint type
= (gchandle
& 7) - 1;
766 * mono_gchandle_get_target:
767 * @gchandle: a GCHandle's handle.
769 * The handle was previously created by calling mono_gchandle_new or
770 * mono_gchandle_new_weakref.
772 * Returns a pointer to the MonoObject represented by the handle or
773 * NULL for a collected object if using a weakref handle.
776 mono_gchandle_get_target (guint32 gchandle
)
778 guint slot
= gchandle
>> 3;
779 guint type
= (gchandle
& 7) - 1;
780 HandleData
*handles
= &gc_handles
[type
];
781 MonoObject
*obj
= NULL
;
784 lock_handles (handles
);
785 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
786 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
787 obj
= mono_gc_weak_link_get (&handles
->entries
[slot
]);
789 obj
= handles
->entries
[slot
];
792 /* print a warning? */
794 unlock_handles (handles
);
795 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
800 mono_gchandle_set_target (guint32 gchandle
, MonoObject
*obj
)
802 guint slot
= gchandle
>> 3;
803 guint type
= (gchandle
& 7) - 1;
804 HandleData
*handles
= &gc_handles
[type
];
805 MonoObject
*old_obj
= NULL
;
809 lock_handles (handles
);
810 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
811 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
812 old_obj
= handles
->entries
[slot
];
813 if (handles
->entries
[slot
])
814 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
816 mono_gc_weak_link_add (&handles
->entries
[slot
], obj
, handles
->type
== HANDLE_WEAK_TRACK
);
818 handles
->entries
[slot
] = obj
;
821 /* print a warning? */
823 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
824 unlock_handles (handles
);
827 if (type
== HANDLE_WEAK_TRACK
)
828 mono_gc_change_weak_track_handle (old_obj
, obj
, gchandle
);
833 * mono_gchandle_is_in_domain:
834 * @gchandle: a GCHandle's handle.
835 * @domain: An application domain.
837 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
840 mono_gchandle_is_in_domain (guint32 gchandle
, MonoDomain
*domain
)
842 guint slot
= gchandle
>> 3;
843 guint type
= (gchandle
& 7) - 1;
844 HandleData
*handles
= &gc_handles
[type
];
845 gboolean result
= FALSE
;
848 lock_handles (handles
);
849 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
850 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
851 result
= domain
->domain_id
== handles
->domain_ids
[slot
];
854 obj
= handles
->entries
[slot
];
858 result
= domain
== mono_object_domain (obj
);
861 /* print a warning? */
863 unlock_handles (handles
);
868 * mono_gchandle_free:
869 * @gchandle: a GCHandle's handle.
871 * Frees the @gchandle handle. If there are no outstanding
872 * references, the garbage collector can reclaim the memory of the
876 mono_gchandle_free (guint32 gchandle
)
878 guint slot
= gchandle
>> 3;
879 guint type
= (gchandle
& 7) - 1;
880 HandleData
*handles
= &gc_handles
[type
];
884 if (type
== HANDLE_WEAK_TRACK
)
885 mono_gc_remove_weak_track_handle (gchandle
);
888 lock_handles (handles
);
889 if (slot
< handles
->size
&& (handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32)))) {
890 if (handles
->type
<= HANDLE_WEAK_TRACK
) {
891 if (handles
->entries
[slot
])
892 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
894 handles
->entries
[slot
] = NULL
;
896 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
898 /* print a warning? */
900 mono_perfcounters
->gc_num_handles
--;
901 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
902 unlock_handles (handles
);
903 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED
, handles
->type
, gchandle
, NULL
);
907 * mono_gchandle_free_domain:
908 * @domain: domain that is unloading
910 * Function used internally to cleanup any GC handle for objects belonging
911 * to the specified domain during appdomain unload.
914 mono_gchandle_free_domain (MonoDomain
*domain
)
918 for (type
= 0; type
< 3; ++type
) {
920 HandleData
*handles
= &gc_handles
[type
];
921 lock_handles (handles
);
922 for (slot
= 0; slot
< handles
->size
; ++slot
) {
923 if (!(handles
->bitmap
[slot
/ 32] & (1 << (slot
% 32))))
925 if (type
<= HANDLE_WEAK_TRACK
) {
926 if (domain
->domain_id
== handles
->domain_ids
[slot
]) {
927 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
928 if (handles
->entries
[slot
])
929 mono_gc_weak_link_remove (&handles
->entries
[slot
]);
932 if (handles
->entries
[slot
] && mono_object_domain (handles
->entries
[slot
]) == domain
) {
933 handles
->bitmap
[slot
/ 32] &= ~(1 << (slot
% 32));
934 handles
->entries
[slot
] = NULL
;
938 unlock_handles (handles
);
944 GCHandle_CheckCurrentDomain (guint32 gchandle
)
946 return mono_gchandle_is_in_domain (gchandle
, mono_domain_get ());
951 #ifdef MONO_HAS_SEMAPHORES
952 static MonoSemType finalizer_sem
;
954 static HANDLE finalizer_event
;
955 static volatile gboolean finished
=FALSE
;
958 mono_gc_finalize_notify (void)
961 g_message ( "%s: prodding finalizer", __func__
);
964 #ifdef MONO_HAS_SEMAPHORES
965 MONO_SEM_POST (&finalizer_sem
);
967 SetEvent (finalizer_event
);
974 collect_objects (gpointer key
, gpointer value
, gpointer user_data
)
976 GPtrArray
*arr
= (GPtrArray
*)user_data
;
977 g_ptr_array_add (arr
, key
);
983 * finalize_domain_objects:
985 * Run the finalizers of all finalizable objects in req->domain.
988 finalize_domain_objects (DomainFinalizationReq
*req
)
990 MonoDomain
*domain
= req
->domain
;
993 while (g_hash_table_size (domain
->finalizable_objects_hash
) > 0) {
997 * Since the domain is unloading, nobody is allowed to put
998 * new entries into the hash table. But finalize_object might
999 * remove entries from the hash table, so we make a copy.
1001 objs
= g_ptr_array_new ();
1002 g_hash_table_foreach (domain
->finalizable_objects_hash
, collect_objects
, objs
);
1003 /* printf ("FINALIZING %d OBJECTS.\n", objs->len); */
1005 for (i
= 0; i
< objs
->len
; ++i
) {
1006 MonoObject
*o
= (MonoObject
*)g_ptr_array_index (objs
, i
);
1007 /* FIXME: Avoid finalizing threads, etc */
1008 mono_gc_run_finalize (o
, 0);
1011 g_ptr_array_free (objs
, TRUE
);
1013 #elif defined(HAVE_SGEN_GC)
1014 #define NUM_FOBJECTS 64
1015 MonoObject
*to_finalize
[NUM_FOBJECTS
];
1017 while ((count
= mono_gc_finalizers_for_domain (domain
, to_finalize
, NUM_FOBJECTS
))) {
1019 for (i
= 0; i
< count
; ++i
) {
1020 mono_gc_run_finalize (to_finalize
[i
], 0);
1025 /* Process finalizers which are already in the queue */
1026 mono_gc_invoke_finalizers ();
1028 /* printf ("DONE.\n"); */
1029 SetEvent (req
->done_event
);
1031 /* The event is closed in mono_domain_finalize if we get here */
1036 finalizer_thread (gpointer unused
)
1039 /* Wait to be notified that there's at least one
1043 g_assert (mono_domain_get () == mono_get_root_domain ());
1045 #ifdef MONO_HAS_SEMAPHORES
1046 MONO_SEM_WAIT (&finalizer_sem
);
1048 /* Use alertable=FALSE since we will be asked to exit using the event too */
1049 WaitForSingleObjectEx (finalizer_event
, INFINITE
, FALSE
);
1052 mono_console_handle_async_ops ();
1054 #ifndef DISABLE_ATTACH
1055 mono_attach_maybe_start ();
1058 if (domains_to_finalize
) {
1059 mono_finalizer_lock ();
1060 if (domains_to_finalize
) {
1061 DomainFinalizationReq
*req
= domains_to_finalize
->data
;
1062 domains_to_finalize
= g_slist_remove (domains_to_finalize
, req
);
1063 mono_finalizer_unlock ();
1065 finalize_domain_objects (req
);
1067 mono_finalizer_unlock ();
1071 /* If finished == TRUE, mono_gc_cleanup has been called (from mono_runtime_cleanup),
1072 * before the domain is unloaded.
1074 mono_gc_invoke_finalizers ();
1076 SetEvent (pending_done_event
);
1079 SetEvent (shutdown_event
);
1086 InitializeCriticalSection (&handle_section
);
1087 InitializeCriticalSection (&allocator_section
);
1089 InitializeCriticalSection (&finalizer_mutex
);
1091 MONO_GC_REGISTER_ROOT_FIXED (gc_handles
[HANDLE_NORMAL
].entries
);
1092 MONO_GC_REGISTER_ROOT_FIXED (gc_handles
[HANDLE_PINNED
].entries
);
1094 mono_gc_base_init ();
1096 if (mono_gc_is_disabled ()) {
1101 finalizer_event
= CreateEvent (NULL
, FALSE
, FALSE
, NULL
);
1102 pending_done_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
1103 shutdown_event
= CreateEvent (NULL
, TRUE
, FALSE
, NULL
);
1104 if (finalizer_event
== NULL
|| pending_done_event
== NULL
|| shutdown_event
== NULL
) {
1105 g_assert_not_reached ();
1107 #ifdef MONO_HAS_SEMAPHORES
1108 MONO_SEM_INIT (&finalizer_sem
, 0);
1111 gc_thread
= mono_thread_create_internal (mono_domain_get (), finalizer_thread
, NULL
, FALSE
);
1112 ves_icall_System_Threading_Thread_SetName_internal (gc_thread
, mono_string_new (mono_domain_get (), "Finalizer"));
1116 mono_gc_cleanup (void)
1119 g_message ("%s: cleaning up finalizer", __func__
);
1123 ResetEvent (shutdown_event
);
1125 if (mono_thread_internal_current () != gc_thread
) {
1126 mono_gc_finalize_notify ();
1127 /* Finishing the finalizer thread, so wait a little bit... */
1128 /* MS seems to wait for about 2 seconds */
1129 if (WaitForSingleObjectEx (shutdown_event
, 2000, FALSE
) == WAIT_TIMEOUT
) {
1132 /* Set a flag which the finalizer thread can check */
1133 suspend_finalizers
= TRUE
;
1135 /* Try to abort the thread, in the hope that it is running managed code */
1136 mono_thread_internal_stop (gc_thread
);
1138 /* Wait for it to stop */
1139 ret
= WaitForSingleObjectEx (gc_thread
->handle
, 100, TRUE
);
1141 if (ret
== WAIT_TIMEOUT
) {
1143 * The finalizer thread refused to die. There is not much we
1144 * can do here, since the runtime is shutting down so the
1145 * state the finalizer thread depends on will vanish.
1147 g_warning ("Shutting down finalizer thread timed out.");
1150 * FIXME: On unix, when the above wait returns, the thread
1151 * might still be running io-layer code, or pthreads code.
1159 #ifdef HAVE_BOEHM_GC
1160 GC_finalizer_notifier
= NULL
;
1164 DeleteCriticalSection (&handle_section
);
1165 DeleteCriticalSection (&allocator_section
);
1166 DeleteCriticalSection (&finalizer_mutex
);
1171 /* Null GC dummy functions */
1173 mono_gc_finalize_notify (void)
1177 void mono_gc_init (void)
1179 InitializeCriticalSection (&handle_section
);
1182 void mono_gc_cleanup (void)
1189 mono_gc_is_finalizer_internal_thread (MonoInternalThread
*thread
)
1191 return thread
== gc_thread
;
1195 * mono_gc_is_finalizer_thread:
1196 * @thread: the thread to test.
1198 * In Mono objects are finalized asynchronously on a separate thread.
1199 * This routine tests whether the @thread argument represents the
1200 * finalization thread.
1202 * Returns true if @thread is the finalization thread.
1205 mono_gc_is_finalizer_thread (MonoThread
*thread
)
1207 return mono_gc_is_finalizer_internal_thread (thread
->internal_thread
);
1210 #if defined(__MACH__)
1211 static pthread_t mach_exception_thread
;
1214 mono_gc_register_mach_exception_thread (pthread_t thread
)
1216 mach_exception_thread
= thread
;
1220 mono_gc_get_mach_exception_thread (void)
1222 return mach_exception_thread
;
1227 * mono_gc_parse_environment_string_extract_number:
1229 * @str: points to the first digit of the number
1230 * @out: pointer to the variable that will receive the value
1232 * Tries to extract a number from the passed string, taking in to account m, k
1235 * Returns true if passing was successful
1238 mono_gc_parse_environment_string_extract_number (const char *str
, glong
*out
)
1241 int len
= strlen (str
), shift
= 0;
1243 gboolean is_suffix
= FALSE
;
1246 switch (str
[len
- 1]) {
1257 suffix
= str
[len
- 1];
1262 val
= strtol (str
, &endptr
, 10);
1264 if ((errno
== ERANGE
&& (val
== LONG_MAX
|| val
== LONG_MIN
))
1265 || (errno
!= 0 && val
== 0) || (endptr
== str
))
1269 if (*(endptr
+ 1)) /* Invalid string. */