Christoph Lameter <[email protected]> wrote: > cmpxchg is the simplest solution to realize many other atomic operations and > its widely available on a wide variety of platforms. But by no means all. Where it doesn't exist it can only be properly emulated by something such as LL/SC if they are there. If not, then you can't do a safe cmpxchg on SMP. > It is the most universal atomic instruction that I know of. I think TAS-type things and XCHG-type things are more common. In fact I think more things have LL/SC than have CMPXCHG. David - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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