• 1. thread-safe code: 安全线程代码

• 1.If you have two operations that require synchronization separated by a small block of thread-safe code, you are generally better just using a single synchronized block.
  要是您想用一小块线程安全代码把要求同步的两个操作隔开，那么只使用一个同步块一般会更好些。
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• 2.Note that this code is fully thread safe.
  注意这样的代码是完全线程安全的。
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• 3.On the surface it looks as though lock elision allows us to write thread safe code without any synchronization penalty for using in cases where it really wasn't needed.
  从表面上看，锁省略似乎可以允许我们不必忍受同步带来的负担，就可以编写线程安全的代码了，前提是在同步的确是多余的情况下。
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