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uridownloader: fix deadlock near EOS

Browse source 
A deadlock can happen when the source sends EOS when
being put to NULL as the object lock is being held by the
thread that sets the element to NULL and is needed by
the event handler.
This commit is contained in:
Thiago Santos 2013-12-20 19:42:52 -03:00
parent d353d229b1
commit 5a5f6d1b7a
1 changed files with 29 additions and 37 deletions
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66
gst-libs/gst/uridownloader/gsturidownloader.c
View file

@ -249,41 +249,6 @@ done:
}
}
/* Must be called with mutex locked. */
static void
gst_uri_downloader_stop (GstUriDownloader * downloader)
{
GstPad *pad;
GstElement *urisrc;
if (!downloader->priv->urisrc)
return;
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (downloader->priv->urisrc));
/* remove the bus' sync handler */
gst_bus_set_sync_handler (downloader->priv->bus, NULL, NULL, NULL);
/* unlink the source element from the internal pad */
pad = gst_pad_get_peer (downloader->priv->pad);
if (pad) {
gst_pad_unlink (pad, downloader->priv->pad);
gst_object_unref (pad);
}
urisrc = downloader->priv->urisrc;
downloader->priv->urisrc = NULL;
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (urisrc));
/* set the element state to NULL */
gst_bus_set_flushing (downloader->priv->bus, TRUE);
gst_element_set_state (urisrc, GST_STATE_NULL);
gst_element_get_state (urisrc, NULL, NULL, GST_CLOCK_TIME_NONE);
gst_element_set_bus (urisrc, NULL);
gst_object_unref (urisrc);
}
void
gst_uri_downloader_reset (GstUriDownloader * downloader)
{
@ -464,8 +429,35 @@ gst_uri_downloader_fetch_uri_with_range (GstUriDownloader * downloader,
quit:
{
gst_uri_downloader_stop (downloader);
GST_OBJECT_UNLOCK (downloader);
if (downloader->priv->urisrc) {
GstPad *pad;
GstElement *urisrc;
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (downloader->priv->urisrc));
/* remove the bus' sync handler */
gst_bus_set_sync_handler (downloader->priv->bus, NULL, NULL, NULL);
/* unlink the source element from the internal pad */
pad = gst_pad_get_peer (downloader->priv->pad);
if (pad) {
gst_pad_unlink (pad, downloader->priv->pad);
gst_object_unref (pad);
}
urisrc = downloader->priv->urisrc;
downloader->priv->urisrc = NULL;
GST_OBJECT_UNLOCK (downloader);
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (urisrc));
/* set the element state to NULL */
gst_bus_set_flushing (downloader->priv->bus, TRUE);
gst_element_set_state (urisrc, GST_STATE_NULL);
gst_element_get_state (urisrc, NULL, NULL, GST_CLOCK_TIME_NONE);
gst_element_set_bus (urisrc, NULL);
gst_object_unref (urisrc);
}
g_mutex_unlock (&downloader->priv->download_lock);
return download;
}