内存重新排序是否对单处理器上的其他线程可见？

It's common that modern CPU architectures employ performance optimizations that can result in out-of-order execution. In single threaded applications memory reordering may also occur, but it's invisible to programmers as if memory was accessed in program order. And for SMP, memory barriers come to the rescue which are used to enforce some sort of memory ordering.It's common that modern CPU architectures emplo