[Bug 788754] gl: wayland: sometimes block pipeline at PREROLLED

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788754

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

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                 CC|                            |ystreet00 at gmail.com

--- Comment #8 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #3)
> I must admit, I'm a bit clueless too. I wonder why the roundtrip code has
> been made so horrible. If you compare with gst_wl_display_roundtrip() (same
> function in waylandsink), the GL one is so complicated. I could not
> reproduce this issue on waylandsink, so the extra complexity seems
> unjustified.

The roundtrip is complicated becuase
1. it deals with both the default-wl_queue and separate wl_queue cases
2. It attempts to solve a race where setting the wl_proxy races with others
reading the queue.

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