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multiqueue: Exit loop function if the pad is flushing

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Fixes possible deadlocks when flushing an unlinked pad that waits
for other pads to advance.
This commit is contained in:
Sebastian Dröge 2011-03-21 16:28:37 +01:00
parent a789096c04
commit 14eb517849
1 changed files with 17 additions and 0 deletions
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17
plugins/elements/gstmultiqueue.c
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@ -148,6 +148,7 @@ struct _GstSingleQueue
GstDataQueueSize max_size, extra_size;
GstClockTime cur_time;
gboolean is_eos;
gboolean flushing;
/* Protected by global lock */
guint32 nextid; /* ID of the next object waiting to be pushed */
@ -661,6 +662,8 @@ gst_single_queue_flush (GstMultiQueue * mq, GstSingleQueue * sq, gboolean flush)
sq->srcresult = GST_FLOW_WRONG_STATE;
gst_data_queue_set_flushing (sq->queue, TRUE);
sq->flushing = TRUE;
/* wake up non-linked task */
GST_LOG_OBJECT (mq, "SingleQueue %d : waking up eventually waiting task",
sq->id);
@ -685,6 +688,8 @@ gst_single_queue_flush (GstMultiQueue * mq, GstSingleQueue * sq, gboolean flush)
sq->last_oldid = G_MAXUINT32;
gst_data_queue_set_flushing (sq->queue, FALSE);
sq->flushing = FALSE;
GST_LOG_OBJECT (mq, "SingleQueue %d : starting task", sq->id);
result =
gst_pad_start_task (sq->srcpad, (GstTaskFunction) gst_multi_queue_loop,
@ -1025,6 +1030,9 @@ gst_multi_queue_loop (GstPad * pad)
GST_DEBUG_OBJECT (mq, "SingleQueue %d : trying to pop an object", sq->id);
if (sq->flushing)
goto out_flushing;
/* Get something from the queue, blocking until that happens, or we get
* flushed */
if (!(gst_data_queue_pop (sq->queue, &sitem)))
@ -1077,6 +1085,11 @@ gst_multi_queue_loop (GstPad * pad)
g_cond_wait (sq->turn, mq->qlock);
mq->numwaiting--;
if (sq->flushing) {
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
goto out_flushing;
}
GST_DEBUG_OBJECT (mq, "queue %d woken from sleeping for not-linked "
"wakeup with newid %u and highid %u", sq->id, newid, mq->highid);
}
@ -1094,6 +1107,9 @@ gst_multi_queue_loop (GstPad * pad)
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
}
if (sq->flushing)
goto out_flushing;
GST_LOG_OBJECT (mq, "BEFORE PUSHING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
@ -1664,6 +1680,7 @@ gst_single_queue_new (GstMultiQueue * mqueue)
(GstDataQueueFullCallback) single_queue_overrun_cb,
(GstDataQueueEmptyCallback) single_queue_underrun_cb, sq);
sq->is_eos = FALSE;
sq->flushing = FALSE;
gst_segment_init (&sq->sink_segment, GST_FORMAT_TIME);
gst_segment_init (&sq->src_segment, GST_FORMAT_TIME);