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a134d1e7ea
When multiple processes are using GL with indirect rendering a race condition can make drawables refcount never drop to zero. This situation could happen when there are many X clients using indirect GLX: 1 - client1: calls glXMakeCurrent 2 - client2: calls glXMakeCurrent This is the first context switch for this client. So old_context_tag=0 3 - client1: calls glXRender For the client, its context is already current. For the server side lastGLContext points to client2's context. Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Guilherme Quentel Melo <gqmelo@gmail.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server
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