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解释 asm("..")可以手动指定符号名。
使用
std::atomic_thread_fence(std::memory_order_acq_rel);
是为了禁止将读取ss::a
优化到写入 b 之前不支持msvc,因为msvc x64 不支持 asm 功能
https://gcc.godbolt.org/z/WYqcc56r7