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valve: Make the drop variable into an atomic.

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Using an atomic allows us to avoid locking the whole object all time time.
As suggested by Stefan Kost.
This commit is contained in:
Olivier Crête 2010-09-30 16:26:19 -04:00
parent 0af7cc8ba7
commit 9246ed081e
2 changed files with 10 additions and 35 deletions
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41
gst/valve/gstvalve.c
View file

@ -153,9 +153,7 @@ gst_valve_set_property (GObject * object,
switch (prop_id) {
case ARG_DROP:
GST_OBJECT_LOCK (object);
valve->drop = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (object);
g_atomic_int_set (&valve->drop, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@ -171,9 +169,7 @@ gst_valve_get_property (GObject * object,
switch (prop_id) {
case ARG_DROP:
GST_OBJECT_LOCK (object);
g_value_set_boolean (value, valve->drop);
GST_OBJECT_UNLOCK (object);
g_value_set_boolean (value, g_atomic_int_get (&valve->drop));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@ -186,13 +182,8 @@ gst_valve_chain (GstPad * pad, GstBuffer * buffer)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
GstFlowReturn ret = GST_FLOW_OK;
gboolean drop;
GST_OBJECT_LOCK (valve);
drop = valve->drop;
GST_OBJECT_UNLOCK (valve);
if (drop) {
if (g_atomic_int_get (&valve->drop)) {
gst_buffer_unref (buffer);
valve->discont = TRUE;
} else {
@ -208,10 +199,8 @@ gst_valve_chain (GstPad * pad, GstBuffer * buffer)
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards
*/
GST_OBJECT_LOCK (valve);
if (valve->drop)
if (g_atomic_int_get (&valve->drop))
ret = GST_FLOW_OK;
GST_OBJECT_UNLOCK (valve);
gst_object_unref (valve);
@ -224,13 +213,8 @@ gst_valve_event (GstPad * pad, GstEvent * event)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
gboolean ret = TRUE;
gboolean drop;
GST_OBJECT_LOCK (valve);
drop = valve->drop;
GST_OBJECT_UNLOCK (valve);
if (drop)
if (g_atomic_int_get (&valve->drop))
gst_event_unref (event);
else
ret = gst_pad_push_event (valve->srcpad, event);
@ -238,10 +222,8 @@ gst_valve_event (GstPad * pad, GstEvent * event)
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards.
*/
GST_OBJECT_LOCK (valve);
if (valve->drop)
if (g_atomic_int_get (&valve->drop))
ret = TRUE;
GST_OBJECT_UNLOCK (valve);
gst_object_unref (valve);
return ret;
@ -253,13 +235,8 @@ gst_valve_buffer_alloc (GstPad * pad, guint64 offset, guint size,
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
GstFlowReturn ret = GST_FLOW_OK;
gboolean drop;
GST_OBJECT_LOCK (valve);
drop = valve->drop;
GST_OBJECT_UNLOCK (valve);
if (drop)
if (g_atomic_int_get (&valve->drop))
*buf = NULL;
else
ret = gst_pad_alloc_buffer (valve->srcpad, offset, size, caps, buf);
@ -267,10 +244,8 @@ gst_valve_buffer_alloc (GstPad * pad, guint64 offset, guint size,
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards
*/
GST_OBJECT_LOCK (valve);
if (valve->drop)
if (g_atomic_int_get (&valve->drop))
ret = GST_FLOW_OK;
GST_OBJECT_UNLOCK (valve);
gst_object_unref (valve);

4
gst/valve/gstvalve.h
View file

@ -55,8 +55,8 @@ struct _GstValve
/*< private >*/
GstElement parent;
/* Protected by the object lock */
gboolean drop;
/* atomic boolean */
volatile gint drop;
/* Protected by the stream lock */
gboolean discont;