synchronized 块会建立一个内存壁垒(memory barrier) ,当进入synchronized块时会建立一个read barrier ：它会使得Thread的本地内存无效，并且从主存中读取所有的变量的值。
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This is suitable for the benign memory barrier, but obviously improves AD the patient cognition function, the behavior and the mood barrier.
本品适用于良性记忆障碍，可显著改善AD患者认知功能、行为和心境障碍。
The memory barrier is a signal that tells the CPU that it must coordinate with all the other CPUs in order to fetch the most up to date value.
存储关卡像一个信号，它通知CPU此时必须和其他所有的CPU进行协调，以此获得最新的数值。
LOCK-Based Critical Sections: Although a LOCK-UNLOCK pair does not act as a full memory barrier, these operations do affect memory ordering. Consider the following code.
锁保护的临界区：经lock - UNLOCK对不能实现完全的内存屏障的功能，但是，它们也的确会影响内存访问顺序，参考下面的示例代码。
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