[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 #7 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-03-20 10:26:25 UTC ---
Created an attachment (id=272474)
 View: https://bugzilla.gnome.org/attachment.cgi?id=272474
 Review: https://bugzilla.gnome.org/review?bug=702840&attachment=272474

Fix event/preroll deadlock

This "works for me". It avoids waiting on the event when downstream may block.
It waits on all buffers and buffer lists, which may be a bit too much, and
denies request then. This seems "violent", but this is also what the existing
code does, so may be OK. Sane enough ?

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