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线程的同步, 发生在多个线程共享相同内存的时候, 这时要保证每个线程在每个时刻看到的共享数据是一致的. 如果每个线程使用的变量都是其他线程不会使用的(read & write), 或者变量是只读的, 就不存在一致性问题. 但是, 如果两个或两个以上的线程可以read/write一个变量时, ...

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