[Mesa-dev] RFC: C11 threads.h

[Jose Fonseca]

----- Original Message -----
> On 03/14/2013 05:10 PM, Jose Fonseca wrote:
> > Mesa source tree currently has 4 abstraction of threading primitives (in
> > gallium, glapi, mapi, and egl components).
> >
> > I'd like to unify all them, and since now the C11 standard introduced a
> > threads.h header, I'd like to use that as model.
> >
> > So for I've imported a C11 threads.h implementation from
> > https://gist.github.com/yohhoy/2223710 , and reimplemented all
> >
> >    http://cgit.freedesktop.org/~jrfonseca/mesa/log/?h=c11-threads
> >
> > If there are no objections, the next step would be to eliminate all
> > threading abstractions and just use C11 threads.h primitives.
> >
> > The only snafu is the wide spread use of static mutex initializers. It's
> > not supported by C11 threads -- I believe one needs to do the
> > initialization via once_init paradigm instead. But for now I just side
> > stepped the problem by defining a non standard initializer. I'll revisit
> > this later.
> >
> > A nice side-benefit of this is that the pre-vista Win32 conditional var
> > implement should be much better than what we have now, which should speed
> > up multithreaded llvmpipe on windows substantially.
> >
> > The same principle could be applied to atomic operations.
> 
> This looks OK to me.

Thanks.
 
> Could we eventually go a step further and replace _EGLMutex,
> pipe_mutex, u_mutex, etc. with mtx_t (and similar with thrd_t, cnd_t,
> etc)?

Definitely. That would be my next step.

Jose