fvanzile eca91d6772 glcontext: keep a ref to the active thread
With the macOS/iOS implementations, the active thread can change
multiple times over the life of a pipeline which would expose a race in
the thread tracking.

Fix by taking a ref on the active thread while the context is active.

https://bugzilla.gnome.org/show_bug.cgi?id=779202
2017-05-20 16:19:38 +02:00
..