[Bug 702840] queue2 does not work with use-buffering=true

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702840
  GStreamer | gst-plugins-base | git

--- Comment #5 from Sebastian Dröge <slomo at circular-chaos.org> 2013-07-16 09:39:21 UTC ---
commit 0dc232e1140be953e920388c54dd4cfa0d7637e0
Author: Sebastian Dröge <slomo at circular-chaos.org>
Date:   Tue Jul 16 11:36:50 2013 +0200

    multiqueue: only block serialized query when it's safe

    We must be certain that we don't cause a deadlock when blocking the
serialized
    queries. One such deadlock can happen when we are buffering and downstream
is
    blocked in preroll and a serialized query arrives. Downstream will not
unblock
    (and allow our query to execute) until we complete buffering and buffering
will
    not complete until we can answer the query..

    https://bugzilla.gnome.org/show_bug.cgi?id=702840

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