[Bug 750397] CRITICAL: Race condition in GstBus

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750397

--- Comment #71 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 330578
  --> https://bugzilla.gnome.org/attachment.cgi?id=330578&action=edit
bus: Make sure to always read the control after popping a message

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.

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