[Bug 767979] New: GstBufferPool: acquire_buffer has unsafe GstPoll usage

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767979

            Bug ID: 767979
           Summary: GstBufferPool: acquire_buffer has unsafe GstPoll usage
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: All
            Status: NEW
          Severity: critical
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: dtverdunov at elvees.com, henning.riis at craftwork.dk,
                    james at stev.org, julien.isorce at gmail.com,
                    mgruenke at tycoint.com, notverysmart at gmail.com,
                    slomo at coaxion.net, thaytan at noraisin.net,
                    vijay.jayaraman at echostar.com, wim.taymans at gmail.com
        Depends on: 750397
     GNOME version: ---

+++ This bug was initially created as a clone of Bug #750397 +++

The order of the GstPoll usage is to first push an object to the queue, then
write the GstPoll control. When getting the object, we first dequeue and if it
is successful read the GstPoll control, and otherwise wait.

This could cause the read to happen before the write, which is not allowed by
GstPoll.


There is also the problem that there is always one control left for flushing,
but if multiple threads get into acquire_buffer and have to wait, two of them
will remove that one control.

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