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| No Format |
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#define mb() asm volatile("mfence":::"memory")
#define rmb() asm volatile("lfence":::"memory")
#define wmb() asm volatile("sfence" ::: "memory")
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FreeBSD
The various memory fences are defined in amd64/include/atomic.h as follows:
| No Format |
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#define mb() __asm __volatile("mfence;" : : : "memory")
#define wmb() __asm __volatile("sfence;" : : : "memory")
#define rmb() __asm __volatile("lfence;" : : : "memory")
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where __volatile is defined as volatile in sys/cdefs.h. I couldn't find the definition for __asm, but I assume it's the same as asm.