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bus: Make sure to always read the control after popping a message

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It might happen that we popped the message before writing of the control
happened. In this case we just have to retry again a bit later, and failure to
do so will cause an additional byte in the control and the GSource /
gst_poll_wait() to always wake up again immediately.

https://bugzilla.gnome.org/show_bug.cgi?id=750397
This commit is contained in:
Sebastian Dröge 2016-06-29 14:02:55 +02:00
parent 149127b755
commit 4ff2721810
1 changed files with 18 additions and 2 deletions
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20
gst/gstbus.c
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@ -515,8 +515,24 @@ gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
gst_atomic_queue_length (bus->priv->queue));
while ((message = gst_atomic_queue_pop (bus->priv->queue))) {
if (bus->priv->poll)
gst_poll_read_control (bus->priv->poll);
if (bus->priv->poll) {
while (!gst_poll_read_control (bus->priv->poll)) {
if (errno == EWOULDBLOCK) {
/* Retry, this can happen if pushing to the queue has finished,
* popping here succeeded but writing control did not finish
* before we got to this line. */
/* Give other threads the chance to do something */
g_thread_yield ();
continue;
} else {
/* This is a real error and means that either the bus is in an
* inconsistent state, or the GstPoll is invalid. GstPoll already
* prints a critical warning about this, no need to do that again
* ourselves */
break;
}
}
}
GST_DEBUG_OBJECT (bus, "got message %p, %s from %s, type mask is %u",
message, GST_MESSAGE_TYPE_NAME (message),