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    SubjectRe: Why Semaphore Hardware-Dependent?
    On Tue, 29 Aug 2006, David Howells 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?

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