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aggregator: Replace event lock with pad's object lock

Browse source 
Reduce the number of locks simplify code, what is protects
is exposed, but the lock was not.

Also means adding an _unlocked version of gst_aggregator_pad_steal_buffer().

https://bugzilla.gnome.org/show_bug.cgi?id=742684
This commit is contained in:
Olivier Crête 2015-01-14 14:35:15 -05:00 committed by Tim-Philipp Müller
parent 6379433a70
commit 3217e82791
2 changed files with 64 additions and 45 deletions
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108
libs/gst/base/gstaggregator.c
View file

@ -78,19 +78,19 @@ GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
#define GST_CAT_DEFAULT aggregator_debug #define GST_CAT_DEFAULT aggregator_debug
/* GstAggregatorPad definitions */ /* GstAggregatorPad definitions */
#define PAD_LOCK_EVENT(pad) G_STMT_START { \ #define PAD_LOCK(pad) G_STMT_START { \
GST_TRACE_OBJECT (pad, "Taking EVENT lock from thread %p", \ GST_TRACE_OBJECT (pad, "Taking PAD lock from thread %p", \
g_thread_self()); \ g_thread_self()); \
g_mutex_lock(&pad->priv->event_lock); \ GST_OBJECT_LOCK (pad); \
GST_TRACE_OBJECT (pad, "Took EVENT lock from thread %p", \ GST_TRACE_OBJECT (pad, "Took PAD lock from thread %p", \
g_thread_self()); \ g_thread_self()); \
} G_STMT_END } G_STMT_END
#define PAD_UNLOCK_EVENT(pad) G_STMT_START { \ #define PAD_UNLOCK(pad) G_STMT_START { \
GST_TRACE_OBJECT (pad, "Releasing EVENT lock from thread %p", \ GST_TRACE_OBJECT (pad, "Releasing PAD lock from thread %p", \
g_thread_self()); \ g_thread_self()); \
g_mutex_unlock(&pad->priv->event_lock); \ GST_OBJECT_UNLOCK (pad); \
GST_TRACE_OBJECT (pad, "Release EVENT lock from thread %p", \ GST_TRACE_OBJECT (pad, "Release PAD lock from thread %p", \
g_thread_self()); \ g_thread_self()); \
} G_STMT_END } G_STMT_END
@ -99,7 +99,7 @@ GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
GST_LOG_OBJECT (pad, "Waiting for EVENT on thread %p", \ GST_LOG_OBJECT (pad, "Waiting for EVENT on thread %p", \
g_thread_self()); \ g_thread_self()); \
g_cond_wait(&(((GstAggregatorPad* )pad)->priv->event_cond), \ g_cond_wait(&(((GstAggregatorPad* )pad)->priv->event_cond), \
&(pad->priv->event_lock)); \ GST_OBJECT_GET_LOCK (pad)); \
GST_LOG_OBJECT (pad, "DONE Waiting for EVENT on thread %p", \ GST_LOG_OBJECT (pad, "DONE Waiting for EVENT on thread %p", \
g_thread_self()); \ g_thread_self()); \
} G_STMT_END } G_STMT_END
@ -181,7 +181,6 @@ struct _GstAggregatorPadPrivate
gboolean pending_eos; gboolean pending_eos;
gboolean flushing; gboolean flushing;
GMutex event_lock;
GCond event_cond; GCond event_cond;
GMutex stream_lock; GMutex stream_lock;
@ -847,13 +846,13 @@ gst_aggregator_default_sink_event (GstAggregator * self,
* called * called
*/ */
SRC_STREAM_LOCK (self); SRC_STREAM_LOCK (self);
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
if (!aggpad->buffer) { if (!aggpad->buffer) {
aggpad->eos = TRUE; aggpad->eos = TRUE;
} else { } else {
aggpad->priv->pending_eos = TRUE; aggpad->priv->pending_eos = TRUE;
} }
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
SRC_STREAM_BROADCAST (self); SRC_STREAM_BROADCAST (self);
SRC_STREAM_UNLOCK (self); SRC_STREAM_UNLOCK (self);
@ -861,10 +860,10 @@ gst_aggregator_default_sink_event (GstAggregator * self,
} }
case GST_EVENT_SEGMENT: case GST_EVENT_SEGMENT:
{ {
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
gst_event_copy_segment (event, &aggpad->segment); gst_event_copy_segment (event, &aggpad->segment);
self->priv->seqnum = gst_event_get_seqnum (event); self->priv->seqnum = gst_event_get_seqnum (event);
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
goto eat; goto eat;
} }
case GST_EVENT_STREAM_START: case GST_EVENT_STREAM_START:
@ -1747,13 +1746,13 @@ gst_aggregator_pad_chain (GstPad * pad, GstObject * object, GstBuffer * buffer)
if (g_atomic_int_get (&aggpad->priv->pending_eos) == TRUE) if (g_atomic_int_get (&aggpad->priv->pending_eos) == TRUE)
goto eos; goto eos;
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
while (aggpad->buffer && g_atomic_int_get (&aggpad->priv->flushing) == FALSE) { while (aggpad->buffer && g_atomic_int_get (&aggpad->priv->flushing) == FALSE) {
GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed"); GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
PAD_WAIT_EVENT (aggpad); PAD_WAIT_EVENT (aggpad);
} }
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE) if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE)
goto flushing; goto flushing;
@ -1763,11 +1762,11 @@ gst_aggregator_pad_chain (GstPad * pad, GstObject * object, GstBuffer * buffer)
} }
SRC_STREAM_LOCK (self); SRC_STREAM_LOCK (self);
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
if (aggpad->buffer) if (aggpad->buffer)
gst_buffer_unref (aggpad->buffer); gst_buffer_unref (aggpad->buffer);
aggpad->buffer = actual_buf; aggpad->buffer = actual_buf;
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
PAD_STREAM_UNLOCK (aggpad); PAD_STREAM_UNLOCK (aggpad);
if (gst_aggregator_check_pads_ready (self)) if (gst_aggregator_check_pads_ready (self))
@ -1803,10 +1802,10 @@ gst_aggregator_pad_query_func (GstPad * pad, GstObject * parent,
GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent); GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
if (GST_QUERY_IS_SERIALIZED (query)) { if (GST_QUERY_IS_SERIALIZED (query)) {
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE) { if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE) {
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
goto flushing; goto flushing;
} }
@ -1815,7 +1814,7 @@ gst_aggregator_pad_query_func (GstPad * pad, GstObject * parent,
GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed"); GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
PAD_WAIT_EVENT (aggpad); PAD_WAIT_EVENT (aggpad);
} }
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE) if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE)
goto flushing; goto flushing;
@ -1838,11 +1837,11 @@ gst_aggregator_pad_event_func (GstPad * pad, GstObject * parent,
if (GST_EVENT_IS_SERIALIZED (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS if (GST_EVENT_IS_SERIALIZED (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS
&& GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT_DONE) { && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT_DONE) {
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE
&& GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) { && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
goto flushing; goto flushing;
} }
@ -1851,7 +1850,7 @@ gst_aggregator_pad_event_func (GstPad * pad, GstObject * parent,
GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed"); GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
PAD_WAIT_EVENT (aggpad); PAD_WAIT_EVENT (aggpad);
} }
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE if (g_atomic_int_get (&aggpad->priv->flushing) == TRUE
&& GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP)
@ -1876,16 +1875,16 @@ gst_aggregator_pad_activate_mode_func (GstPad * pad,
GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad); GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
if (active == FALSE) { if (active == FALSE) {
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
g_atomic_int_set (&aggpad->priv->flushing, TRUE); g_atomic_int_set (&aggpad->priv->flushing, TRUE);
gst_buffer_replace (&aggpad->buffer, NULL); gst_buffer_replace (&aggpad->buffer, NULL);
PAD_BROADCAST_EVENT (aggpad); PAD_BROADCAST_EVENT (aggpad);
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
} else { } else {
PAD_LOCK_EVENT (aggpad); PAD_LOCK (aggpad);
g_atomic_int_set (&aggpad->priv->flushing, FALSE); g_atomic_int_set (&aggpad->priv->flushing, FALSE);
PAD_BROADCAST_EVENT (aggpad); PAD_BROADCAST_EVENT (aggpad);
PAD_UNLOCK_EVENT (aggpad); PAD_UNLOCK (aggpad);
} }
return TRUE; return TRUE;
@ -1916,7 +1915,6 @@ gst_aggregator_pad_finalize (GObject * object)
{ {
GstAggregatorPad *pad = (GstAggregatorPad *) object; GstAggregatorPad *pad = (GstAggregatorPad *) object;
g_mutex_clear (&pad->priv->event_lock);
g_cond_clear (&pad->priv->event_cond); g_cond_clear (&pad->priv->event_cond);
g_mutex_clear (&pad->priv->stream_lock); g_mutex_clear (&pad->priv->stream_lock);
@ -1956,12 +1954,42 @@ gst_aggregator_pad_init (GstAggregatorPad * pad)
GstAggregatorPadPrivate); GstAggregatorPadPrivate);
pad->buffer = NULL; pad->buffer = NULL;
g_mutex_init (&pad->priv->event_lock);
g_cond_init (&pad->priv->event_cond); g_cond_init (&pad->priv->event_cond);
g_mutex_init (&pad->priv->stream_lock); g_mutex_init (&pad->priv->stream_lock);
} }
/**
* gst_aggregator_pad_steal_buffer_unlocked:
* @pad: the pad to get buffer from
*
* Steal the ref to the buffer currently queued in @pad.
*
* MUST be called with the pad's object lock held.
*
* Returns: (transfer full): The buffer in @pad or NULL if no buffer was
* queued. You should unref the buffer after usage.
*/
GstBuffer *
gst_aggregator_pad_steal_buffer_unlocked (GstAggregatorPad * pad)
{
GstBuffer *buffer = NULL;
if (pad->buffer) {
GST_TRACE_OBJECT (pad, "Consuming buffer");
buffer = pad->buffer;
pad->buffer = NULL;
if (pad->priv->pending_eos) {
pad->priv->pending_eos = FALSE;
pad->eos = TRUE;
}
PAD_BROADCAST_EVENT (pad);
GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
}
return buffer;
}
/** /**
* gst_aggregator_pad_steal_buffer: * gst_aggregator_pad_steal_buffer:
* @pad: the pad to get buffer from * @pad: the pad to get buffer from
@ -1976,19 +2004,9 @@ gst_aggregator_pad_steal_buffer (GstAggregatorPad * pad)
{ {
GstBuffer *buffer = NULL; GstBuffer *buffer = NULL;
PAD_LOCK_EVENT (pad); PAD_LOCK (pad);
if (pad->buffer) { buffer = gst_aggregator_pad_steal_buffer_unlocked (pad);
GST_TRACE_OBJECT (pad, "Consuming buffer"); PAD_UNLOCK (pad);
buffer = pad->buffer;
pad->buffer = NULL;
if (pad->priv->pending_eos) {
pad->priv->pending_eos = FALSE;
pad->eos = TRUE;
}
PAD_BROADCAST_EVENT (pad);
GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
}
PAD_UNLOCK_EVENT (pad);
return buffer; return buffer;
} }
@ -2006,10 +2024,10 @@ gst_aggregator_pad_get_buffer (GstAggregatorPad * pad)
{ {
GstBuffer *buffer = NULL; GstBuffer *buffer = NULL;
PAD_LOCK_EVENT (pad); PAD_LOCK (pad);
if (pad->buffer) if (pad->buffer)
buffer = gst_buffer_ref (pad->buffer); buffer = gst_buffer_ref (pad->buffer);
PAD_UNLOCK_EVENT (pad); PAD_UNLOCK (pad);
return buffer; return buffer;
} }

1
libs/gst/base/gstaggregator.h
View file

@ -104,6 +104,7 @@ GType gst_aggregator_pad_get_type (void);
***************************/ ***************************/
GstBuffer * gst_aggregator_pad_steal_buffer (GstAggregatorPad * pad); GstBuffer * gst_aggregator_pad_steal_buffer (GstAggregatorPad * pad);
GstBuffer * gst_aggregator_pad_steal_buffer_unlocked (GstAggregatorPad * pad);
GstBuffer * gst_aggregator_pad_get_buffer (GstAggregatorPad * pad); GstBuffer * gst_aggregator_pad_get_buffer (GstAggregatorPad * pad);
/********************* /*********************