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object: make gst_object_replace() atomic

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This commit is contained in:
David Schleef 2011-08-21 14:07:08 -07:00
parent cce32ba0a2
commit ec6e452f63
1 changed files with 12 additions and 8 deletions
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20
gst/gstobject.c
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@ -421,10 +421,14 @@ gst_object_sink (gpointer object)
*
* Make sure not to LOCK @oldobj because it might be unreffed
* which could cause a deadlock when it is disposed.
*
* Since 0.10.36, this function operates atomically.
*/
void
gst_object_replace (GstObject ** oldobj, GstObject * newobj)
{
GstObject *oldptr;
g_return_if_fail (oldobj != NULL);
g_return_if_fail (*oldobj == NULL || GST_IS_OBJECT (*oldobj));
g_return_if_fail (newobj == NULL || GST_IS_OBJECT (newobj));
@ -437,14 +441,14 @@ gst_object_replace (GstObject ** oldobj, GstObject * newobj)
newobj ? G_OBJECT (newobj)->ref_count : 0);
#endif
if (G_LIKELY (*oldobj != newobj)) {
if (newobj)
gst_object_ref (newobj);
if (*oldobj)
gst_object_unref (*oldobj);
*oldobj = newobj;
}
if (newobj)
g_object_ref (newobj);
do {
oldptr = *oldobj;
} while (!g_atomic_pointer_compare_and_exchange ((void *) oldobj,
oldptr, newobj));
if (oldptr)
g_object_unref (oldptr);
}
/* dispose is called when the object has to release all links