Le jeudi 19 août 2010 à 08:35 -0400, Mathieu Desnoyers a écrit :

quoted text
> I made sure it was available on all architectures with that patchset,
> with the intended goal to used it (cmpxchg, cmpxchg_local for 32/64-bit
> and cmpxchg64, cmpxchg64_local for 64-bit) in arch-agnostic tracer code.
> 
> I added a cmpxchg emulated with irqs off for uniprocessor-only
> architectures that did not have CAS support. sparc32 has moved to a
> hashed locked scheme for its atomic operations long ago, which makes the
> full 32 bits available.
> 
> So, all in all, I'd be surprised if an architecture would lack
> cmpxchg() today. It might be possible that a new architecture that just
> came in would not have taken care of deploying cmpxchg, but that should
> be easily fixable.

Thats pretty cool, thanks for clarification !


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