mfence, lfence, sfence什麼做用?

mfence, lfence, sfence什麼做用? // src/backend/utils/rac/lock_free_queu.array_spsc_queue.c #define mb() asm volatile("mfence":::"memory") #define rmb() asm volatile("lfence":::"memory") #define wmb() asm

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