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dashdemux: simplify locking for streams

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Use a single lock for all streams instead of having separate locks.
This makes maintenance easier and at most points we would need
a single lock before iterating on all streams data. So not much
is gained from individual locks.
This commit is contained in:
Thiago Santos 2013-12-09 13:33:53 -03:00
parent a2583e54d1
commit 7c6ccda3ec
2 changed files with 15 additions and 24 deletions
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38
ext/dash/gstdashdemux.c
View file

@ -184,9 +184,6 @@ enum
#define GST_DASH_DEMUX_CLIENT_LOCK(d) g_mutex_lock (&d->client_lock)
#define GST_DASH_DEMUX_CLIENT_UNLOCK(d) g_mutex_unlock (&d->client_lock)
#define GST_DASH_DEMUX_STREAM_DOWNLOAD_LOCK(s) g_mutex_lock (&s->download_mutex)
#define GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK(s) g_mutex_unlock (&s->download_mutex)
/* Custom internal event to signal end of period */
#define GST_EVENT_DASH_EOP GST_EVENT_MAKE_TYPE(81, GST_EVENT_TYPE_DOWNSTREAM | GST_EVENT_TYPE_SERIALIZED)
static GstEvent *
@ -269,7 +266,6 @@ gst_dash_demux_dispose (GObject * obj)
demux->downloader = NULL;
}
g_mutex_clear (&demux->streams_lock);
g_mutex_clear (&demux->client_lock);
G_OBJECT_CLASS (parent_class)->dispose (obj);
@ -352,7 +348,6 @@ gst_dash_demux_init (GstDashDemux * demux)
gst_task_new ((GstTaskFunction) gst_dash_demux_stream_loop, demux, NULL);
gst_task_set_lock (demux->stream_task, &demux->stream_task_lock);
g_mutex_init (&demux->streams_lock);
g_mutex_init (&demux->client_lock);
}
@ -597,7 +592,6 @@ gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
return FALSE;
gst_dash_demux_expose_streams (demux);
gst_dash_demux_remove_streams (demux, streams);
}
@ -643,11 +637,11 @@ gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
case GST_EVENT_RECONFIGURE:{
GSList *iter;
GST_DASH_DEMUX_CLIENT_LOCK (demux);
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
if (stream->pad == pad) {
GST_DASH_DEMUX_STREAM_DOWNLOAD_LOCK (stream);
if (stream->last_ret == GST_FLOW_NOT_LINKED) {
stream->last_ret = GST_FLOW_OK;
stream->restart_download = TRUE;
@ -655,11 +649,12 @@ gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
GST_DEBUG_OBJECT (stream->pad, "Restarting download loop");
}
gst_task_start (stream->download_task);
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
gst_event_unref (event);
return TRUE;
}
}
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
}
break;
default:
@ -1151,7 +1146,7 @@ static gboolean
gst_dash_demux_advance_period (GstDashDemux * demux)
{
GSList *old_period = NULL;
g_mutex_lock (&demux->streams_lock);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
GST_DEBUG_OBJECT (demux, "Advancing period from %p", demux->streams);
@ -1169,14 +1164,14 @@ gst_dash_demux_advance_period (GstDashDemux * demux)
demux->streams = demux->next_periods->data;
} else {
GST_DEBUG_OBJECT (demux, "No next periods, return FALSE");
g_mutex_unlock (&demux->streams_lock);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return FALSE;
}
gst_dash_demux_expose_streams (demux);
gst_dash_demux_remove_streams (demux, old_period);
g_mutex_unlock (&demux->streams_lock);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return TRUE;
}
@ -1376,7 +1371,7 @@ gst_dash_demux_stream_loop (GstDashDemux * demux)
}
if (selected_stream) {
GST_DASH_DEMUX_STREAM_DOWNLOAD_LOCK (selected_stream);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (ret != selected_stream->last_ret) {
gst_task_start (selected_stream->download_task);
selected_stream->last_ret = ret;
@ -1389,12 +1384,12 @@ gst_dash_demux_stream_loop (GstDashDemux * demux)
break;
}
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (selected_stream);
/* combine flow returns */
ret = gst_dash_demux_combine_flows (demux);
if (ret < 0) {
goto error;
}
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
}
end:
@ -1731,19 +1726,19 @@ gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream)
GST_LOG_OBJECT (stream->pad, "Starting download loop");
GST_DASH_DEMUX_STREAM_DOWNLOAD_LOCK (stream);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (stream->last_ret < GST_FLOW_OK) {
if (demux->cancelled) {
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
goto cancelled;
}
GST_DEBUG_OBJECT (stream->pad, "Download loop waiting due to flow return: "
"%d %s", stream->last_ret, gst_flow_get_name (stream->last_ret));
gst_task_pause (stream->download_task);
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return;
}
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
if (demux->cancelled) {
goto cancelled;
@ -1775,8 +1770,7 @@ gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream)
case GST_FLOW_OK:
break;
case GST_FLOW_EOS:
g_mutex_lock (&demux->streams_lock);
GST_DASH_DEMUX_STREAM_DOWNLOAD_LOCK (stream);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (gst_dash_demux_all_streams_eop (demux)) {
GST_INFO_OBJECT (stream->pad, "Reached the end of the Period");
@ -1794,14 +1788,12 @@ gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream)
GST_INFO_OBJECT (stream->pad, "Reached the end of the manifest file");
demux->end_of_manifest = TRUE;
gst_task_start (demux->stream_task);
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
g_mutex_unlock (&demux->streams_lock);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
goto end_of_manifest;
}
}
gst_task_pause (stream->download_task);
GST_DASH_DEMUX_STREAM_DOWNLOAD_UNLOCK (stream);
g_mutex_unlock (&demux->streams_lock);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
break;
case GST_FLOW_ERROR:
/* Download failed 'by itself'

1
ext/dash/gstdashdemux.h
View file

@ -123,7 +123,6 @@ struct _GstDashDemux
GSList *streams;
GSList *next_periods;
GMutex streams_lock;
GstSegment segment;
gboolean need_segment;