To acquire the lease the thread is required to execute an expensive atomic instruction.

为了获得这份契约，线程必须执行一个代价昂贵的原子指令。

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Note that the CMPXCHG instruction is atomic, which means that there is no intermediate visible state of the system before this instruction finishes.

注意，CMPXCHG指令是原子性的，这意味着在这个指令结束之前没有可见的中间状态。

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