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    SubjectRe: [PATCH 13/15] x86: add cmpxchg_flag() variant
    On 08/23/2011 12:53 PM, Jeremy Fitzhardinge wrote:
    >
    > Yes, that would ideal. The closest you can get is asm goto(), but the
    > syntax for that would be awful; something like:
    >
    > #define cmpxchg_jump(ptr, old, new, fail)\
    > asm goto (...)
    >
    >
    > :
    > :
    >
    > again:
    > old = *thingp;
    > new = frobulate(old);
    > cmpxchg_jump(thingp, old, new, again);
    > /* worked */
    >
    > Would this be useful enough?
    >

    Actually there is a trick:

    static inline bool ....
    {
    asm goto(... yes);
    no:
    return false;
    yes:
    return true;
    }

    ... which makes syntax a heckuva lot less awkward.

    -hpa


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