同步的主要方式就是使用synchronized块，它既提供了互斥又提供了可见性保证。

The primary means of synchronization is the use of synchronized blocks, which provide both mutual exclusion and visibility guarantees.

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设置互斥的另一种方式是使用互斥属性对象。

Another way of setting the mutex kind is by using a mutex attribute object.

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