[Bug 764939] gstbasesink: deadlock caused by klass->wait_event() which leaves preroll mutex locked

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764939

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 325792
  --> https://bugzilla.gnome.org/attachment.cgi?id=325792&action=edit
basesink: Take PREROLL_LOCK in wait_event()

It is calling do_sync(), which requires the STREAM_LOCK and PREROLL_LOCK to be
taken. The STREAM_LOCK is already taken in all callers, the PREROLL_LOCK not.

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