临界
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C++如何使用std::atomic::compare?exchange?weak构建非阻塞互斥锁
compare_exchange_weak适合做自旋锁因其失败开销更低：在x86等架构上伪失败不触发内存屏障或总线锁，缓存压力小；返回bool并更新expected值，契合“读-改…
compare_exchange_weak适合做自旋锁因其失败开销更低：在x86等架构上伪失败不触发内存屏障或总线锁，缓存压力小；返回bool并更新expected值，契合“读-改…
