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< * $FreeBSD: head/sys/amd64/include/atomic.h 177276 2008-03-16 21:20:50Z pjd $
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> * $FreeBSD: head/sys/amd64/include/atomic.h 185162 2008-11-22 05:55:56Z kmacy $
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> #define mb() __asm__ __volatile__ ("mfence;": : :"memory")
> #define wmb() __asm__ __volatile__ ("sfence;": : :"memory")
> #define rmb() __asm__ __volatile__ ("lfence;": : :"memory")
>