[Piglit] [PATCH 1/2] glx: Replace extra mutexes with XInitThreads

[Eric Anholt]

Paul Berry <stereotype441 at gmail.com> writes:

> From: Ian Romanick <ian.d.romanick at intel.com>
>
> To use multithreading with xlib, you're supposed to call XInitThreads
> before any other xlib call.  Without this, xlib and GLX calls won't be
> thread safe.  It looks like this test had an extra mutex to work
> around the lack of thread saftey in glXCreateContext and
> glXMakeCurrent.

I don't think that was the intent behind the mutexes -- really just
wanted the two rendering threads to be totally serialized.  If we wanted
to test threads doing simultaneous drawing, we would probably want to do
drawing in a loop and hopefully get the two threads started at the same
time.

That said, we should definitely use XInitThreads().
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