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miniobject: add new methods to manage miniobject pointers

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Add a new method to steal the miniobject stored at a location.
Add a new method to store a miniobject in a location and taking ownership
of the miniobject.
This commit is contained in:
Wim Taymans 2011-06-09 13:35:08 +02:00
parent 9d2953288c
commit 1b98eb34d7
2 changed files with 87 additions and 9 deletions
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92
gst/gstminiobject.c
View file

@ -284,16 +284,20 @@ gst_mini_object_unref (GstMiniObject * mini_object)
* be replaced
* @newdata: pointer to new mini-object
*
* Modifies a pointer to point to a new mini-object. The modification
* is done atomically, and the reference counts are updated correctly.
* Atomically modifies a pointer to point to a new mini-object.
* The reference count of @olddata is decreased and the reference count of
* @newdata is increased.
*
* Either @newdata and the value pointed to by @olddata may be NULL.
*
* Returns: TRUE if @newdata was different from @olddata
*/
void
gboolean
gst_mini_object_replace (GstMiniObject ** olddata, GstMiniObject * newdata)
{
GstMiniObject *olddata_val;
g_return_if_fail (olddata != NULL);
g_return_val_if_fail (olddata != NULL, FALSE);
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "replace %p (%d) with %p (%d)",
*olddata, *olddata ? (*olddata)->refcount : 0,
@ -301,19 +305,91 @@ gst_mini_object_replace (GstMiniObject ** olddata, GstMiniObject * newdata)
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
if (olddata_val == newdata)
return;
if (G_UNLIKELY (olddata_val == newdata))
return FALSE;
if (newdata)
gst_mini_object_ref (newdata);
while (!g_atomic_pointer_compare_and_exchange ((gpointer *) olddata,
olddata_val, newdata)) {
while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
olddata, olddata_val, newdata))) {
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
if (G_UNLIKELY (olddata_val == newdata))
break;
}
if (olddata_val)
gst_mini_object_unref (olddata_val);
return olddata_val != newdata;
}
/**
* gst_mini_object_steal:
* @olddata: (inout) (transfer full): pointer to a pointer to a mini-object to
* be stolen
*
* Replace the current #GstMiniObject pointer to by @olddata with NULL and
* return the old value.
*
* Returns: the #GstMiniObject at @oldata
*/
GstMiniObject *
gst_mini_object_steal (GstMiniObject ** olddata)
{
GstMiniObject *olddata_val;
g_return_val_if_fail (olddata != NULL, NULL);
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "steal %p (%d)",
*olddata, *olddata ? (*olddata)->refcount : 0);
do {
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
if (olddata_val == NULL)
break;
} while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
olddata, olddata_val, NULL)));
return olddata_val;
}
/**
* gst_mini_object_take:
* @olddata: (inout) (transfer full): pointer to a pointer to a mini-object to
* be replaced
*
* Modifies a pointer to point to a new mini-object. The modification
* is done atomically. This version is similar to gst_mini_object_replace()
* except that it does not increase the refcount of @newdata and thus
* takes ownership of @newdata.
*
* Either @newdata and the value pointed to by @olddata may be NULL.
*
* Returns: TRUE if @newdata was different from @olddata
*/
gboolean
gst_mini_object_take (GstMiniObject ** olddata, GstMiniObject * newdata)
{
GstMiniObject *olddata_val;
g_return_val_if_fail (olddata != NULL, FALSE);
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "take %p (%d) with %p (%d)",
*olddata, *olddata ? (*olddata)->refcount : 0,
newdata, newdata ? newdata->refcount : 0);
do {
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
if (G_UNLIKELY (olddata_val == newdata))
break;
} while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
olddata, olddata_val, newdata)));
if (olddata_val)
gst_mini_object_unref (olddata_val);
return olddata_val != newdata;
}
/**

4
gst/gstminiobject.h
View file

@ -211,7 +211,9 @@ void gst_mini_object_weak_unref (GstMiniObject *object,
GstMiniObjectWeakNotify notify,
gpointer data);
void gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
gboolean gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
gboolean gst_mini_object_take (GstMiniObject **olddata, GstMiniObject *newdata);
GstMiniObject * gst_mini_object_steal (GstMiniObject **olddata);
G_END_DECLS