Fetch_add

原子加

• x86平台

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  static inline uint64 pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_) { uint64 res; __asm__ __volatile__( " lock \n" " xaddq %0,%1 \n" : "=q"(res), "=m"(ptr->value) : "0" (add_), "m"(ptr->value) : "memory", "cc"); return res; }

• AArch64平台

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  static inline uint64 pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_) { return __sync_fetch_and_add(&ptr->value, add_); }