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urisourcebin: Use atomic lock for detecting shutdown

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This fixes lock ordering issues

Fixes #3323

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6178>
This commit is contained in:
Edward Hervey 2024-02-22 11:09:24 +01:00 committed by GStreamer Marge Bot
parent 3ce62be851
commit 03f8968119
1 changed files with 16 additions and 12 deletions
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28
subprojects/gst-plugins-base/gst/playback/gsturisourcebin.c
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@ -160,7 +160,7 @@ struct _GstURISourceBin
guint64 connection_speed;
gboolean activated; /* TRUE if the switch to PAUSED has been completed */
gboolean flushing; /* TRUE if switching from PAUSED to READY */
gint flushing; /* TRUE if switching from PAUSED to READY (atomic int) */
GCond activation_cond; /* Uses the urisourcebin lock */
gboolean is_stream;
@ -1367,15 +1367,15 @@ expose_block_probe (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
GST_DEBUG_OBJECT (pad, "blocking");
GST_URI_SOURCE_BIN_LOCK (urisrc);
while (!urisrc->activated && !urisrc->flushing) {
while (!urisrc->activated && !g_atomic_int_get (&urisrc->flushing)) {
GST_DEBUG_OBJECT (urisrc, "activated:%d flushing:%d", urisrc->activated,
urisrc->flushing);
g_atomic_int_get (&urisrc->flushing));
g_cond_wait (&urisrc->activation_cond, &urisrc->lock);
}
GST_DEBUG_OBJECT (urisrc, "activated:%d flushing:%d", urisrc->activated,
urisrc->flushing);
g_atomic_int_get (&urisrc->flushing));
if (!urisrc->flushing)
if (!g_atomic_int_get (&urisrc->flushing))
expose = TRUE;
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
if (expose)
@ -1943,13 +1943,17 @@ setup_parsebin_for_slot (ChildSrcPadInfo * info, GstPad * originating_pad)
GST_DEBUG_OBJECT (urisrc, "Setting up parsebin for %" GST_PTR_FORMAT,
originating_pad);
GST_URI_SOURCE_BIN_LOCK (urisrc);
if (urisrc->flushing) {
if (g_atomic_int_get (&urisrc->flushing)) {
GST_DEBUG_OBJECT (urisrc, "Shutting down, returning early");
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return FALSE;
}
GST_STATE_LOCK (urisrc);
if (g_atomic_int_get (&urisrc->flushing)) {
GST_DEBUG_OBJECT (urisrc, "Shutting down, returning early");
GST_STATE_UNLOCK (urisrc);
return FALSE;
}
GST_URI_SOURCE_BIN_LOCK (urisrc);
/* Set up optional pre-parsebin download/ringbuffer elements */
if (info->use_downloadbuffer || urisrc->ring_buffer_max_size) {
@ -2019,8 +2023,8 @@ setup_parsebin_for_slot (ChildSrcPadInfo * info, GstPad * originating_pad)
}
gst_element_set_locked_state (info->demuxer, FALSE);
gst_element_sync_state_with_parent (info->demuxer);
GST_STATE_UNLOCK (urisrc);
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
GST_STATE_UNLOCK (urisrc);
return TRUE;
could_not_link:
@ -2029,8 +2033,8 @@ could_not_link:
gst_element_set_locked_state (info->pre_parse_queue, FALSE);
if (info->demuxer)
gst_element_set_locked_state (info->demuxer, FALSE);
GST_STATE_UNLOCK (urisrc);
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
GST_STATE_UNLOCK (urisrc);
GST_ELEMENT_ERROR (urisrc, CORE, NEGOTIATION,
(NULL), ("Can't link to (pre-)parsebin element"));
return FALSE;
@ -3068,8 +3072,8 @@ gst_uri_source_bin_change_state (GstElement * element,
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
g_atomic_int_set (&urisrc->flushing, 0);
GST_URI_SOURCE_BIN_LOCK (element);
urisrc->flushing = FALSE;
urisrc->activated = FALSE;
GST_URI_SOURCE_BIN_UNLOCK (element);
GST_DEBUG ("ready to paused");
@ -3077,8 +3081,8 @@ gst_uri_source_bin_change_state (GstElement * element,
goto source_failed;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
g_atomic_int_set (&urisrc->flushing, 1);
GST_URI_SOURCE_BIN_LOCK (element);
urisrc->flushing = TRUE;
g_cond_broadcast (&urisrc->activation_cond);
GST_URI_SOURCE_BIN_UNLOCK (element);
default: