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    SubjectRe: Why Semaphore Hardware-Dependent?
    On Tue, Aug 29, 2006 at 08:56:36AM -0700, Christoph Lameter wrote:

    > > Because i386 (and x86_64) can do better by using XADDL/XADDQ.
    > And Ia64 would like to use fetchadd....
    > > CMPXCHG is not available on all archs, and may not be implemented on all archs
    > > through other atomic instructions.
    > Which arches do not support cmpxchg?

    MIPS, Alpha - probably any pure RISC load/store architecture.

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