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.
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)?
-Brian
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