On Wed, Sep 23, 2015 at 08:22:19PM +0300, Alexander Monakov wrote:
> This patch provides minimal non-stub implementations for libgomp
> mutex/ptrlock/semaphore, using atomic ops and busy waiting. The goal here is
> to at least provide stub struct declarations necessary to unbreak libgomp.h.
>
> Atomics with busy waiting seems to be the only way to provide such primitives
> for inter-team synchronizations, but for intra-team ops a more efficient
> implementation may be possible.
I expect almost all the synchronization primitives can be just intra-team,
the only possible exception (though not required by the standard) would be
the locks used in atomic.c I'd say. But I guess this is ok for now as the
first step.
>
> (all functionality is unused since consumers are stubbed out in config/nvptx)
>
> * config/nvptx/mutex.h: New file.
> * config/nvptx/ptrlock.h: New file.
> * config/nvptx/sem.h: New file.
Jakub
