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splitmuxsink: Don't use the element state lock

Browse source 
Using the element state lock to avoid splitmuxsink shutting
down while doing element manipulations can lead to a deadlock on
shutdown if a fragment switch happens at exactly the wrong moment.

Use a private mutex and a shutdown boolean instead.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/798>
This commit is contained in:
Jan Schmidt 2020-10-31 02:19:07 +11:00 committed by Jan Schmidt
parent 41ca3b4e43
commit d12fa00195
2 changed files with 28 additions and 3 deletions
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27
gst/multifile/gstsplitmuxsink.c
View file

@ -80,6 +80,9 @@
GST_DEBUG_CATEGORY_STATIC (splitmux_debug);
#define GST_CAT_DEFAULT splitmux_debug
#define GST_SPLITMUX_STATE_LOCK(s) g_mutex_lock(&(s)->state_lock)
#define GST_SPLITMUX_STATE_UNLOCK(s) g_mutex_unlock(&(s)->state_lock)
#define GST_SPLITMUX_LOCK(s) g_mutex_lock(&(s)->lock)
#define GST_SPLITMUX_UNLOCK(s) g_mutex_unlock(&(s)->lock)
#define GST_SPLITMUX_WAIT_INPUT(s) g_cond_wait (&(s)->input_cond, &(s)->lock)
@ -577,6 +580,7 @@ static void
gst_splitmux_sink_init (GstSplitMuxSink * splitmux)
{
g_mutex_init (&splitmux->lock);
g_mutex_init (&splitmux->state_lock);
g_cond_init (&splitmux->input_cond);
g_cond_init (&splitmux->output_cond);
g_queue_init (&splitmux->out_cmd_q);
@ -650,6 +654,7 @@ gst_splitmux_sink_finalize (GObject * object)
g_cond_clear (&splitmux->input_cond);
g_cond_clear (&splitmux->output_cond);
g_mutex_clear (&splitmux->lock);
g_mutex_clear (&splitmux->state_lock);
g_queue_foreach (&splitmux->out_cmd_q, (GFunc) out_cmd_buf_free, NULL);
g_queue_clear (&splitmux->out_cmd_q);
@ -1899,7 +1904,14 @@ start_next_fragment (GstSplitMuxSink * splitmux, MqStreamCtx * ctx)
sink = gst_object_ref (splitmux->active_sink);
GST_SPLITMUX_UNLOCK (splitmux);
GST_STATE_LOCK (splitmux);
GST_SPLITMUX_STATE_LOCK (splitmux);
if (splitmux->shutdown) {
GST_DEBUG_OBJECT (splitmux,
"Shutdown requested. Aborting fragment switch.");
GST_SPLITMUX_STATE_UNLOCK (splitmux);
return;
}
if (splitmux->async_finalize) {
if (splitmux->muxed_out_bytes > 0
@ -2012,7 +2024,7 @@ start_next_fragment (GstSplitMuxSink * splitmux, MqStreamCtx * ctx)
gst_object_unref (muxer);
GST_SPLITMUX_LOCK (splitmux);
GST_STATE_UNLOCK (splitmux);
GST_SPLITMUX_STATE_UNLOCK (splitmux);
splitmux->switching_fragment = FALSE;
do_async_done (splitmux);
@ -2030,7 +2042,7 @@ start_next_fragment (GstSplitMuxSink * splitmux, MqStreamCtx * ctx)
return;
fail:
GST_STATE_UNLOCK (splitmux);
GST_SPLITMUX_STATE_UNLOCK (splitmux);
GST_ELEMENT_ERROR (splitmux, RESOURCE, SETTINGS,
("Could not create the new muxer/sink"), NULL);
}
@ -3549,12 +3561,21 @@ gst_splitmux_sink_change_state (GstElement * element, GstStateChange transition)
splitmux->output_state = SPLITMUX_OUTPUT_STATE_START_NEXT_FILE;
GST_SPLITMUX_UNLOCK (splitmux);
GST_SPLITMUX_STATE_LOCK (splitmux);
splitmux->shutdown = FALSE;
GST_SPLITMUX_STATE_UNLOCK (splitmux);
break;
}
case GST_STATE_CHANGE_PAUSED_TO_READY:
g_atomic_int_set (&(splitmux->split_requested), FALSE);
g_atomic_int_set (&(splitmux->do_split_next_gop), FALSE);
case GST_STATE_CHANGE_READY_TO_NULL:
GST_SPLITMUX_STATE_LOCK (splitmux);
splitmux->shutdown = TRUE;
GST_SPLITMUX_STATE_UNLOCK (splitmux);
GST_SPLITMUX_LOCK (splitmux);
gst_splitmux_sink_reset (splitmux);
splitmux->output_state = SPLITMUX_OUTPUT_STATE_STOPPED;

4
gst/multifile/gstsplitmuxsink.h
View file

@ -105,7 +105,11 @@ struct _GstSplitMuxSink
{
GstBin parent;
GMutex state_lock;
gboolean shutdown;
GMutex lock;
GCond input_cond;
GCond output_cond;