[Bug 772455] New: Possible race in wayland_sync

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772455

            Bug ID: 772455
           Summary: Possible race in wayland_sync
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mail at jensge.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

If you have a second thread that registers a second queue on the wayland
display and that will call wl_display_flush, it can happen that the frame
callbacks are already triggered by the while loop in
https://cgit.freedesktop.org/gstreamer/gstreamer-vaapi/tree/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c#n174.
So it can happen that after 

https://cgit.freedesktop.org/gstreamer/gstreamer-vaapi/tree/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c#n178

the priv->num_frames_pending is already 0 and we will be stuck in gst_poll_wait
forever.

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