The constructor and destructor of the queue class are responsible for the creation and destruction of the mutex, as shown in Listing 1.
队列类的构造函数和析构函数负责创建和销毁互斥锁，见清单1。
Class with only 1 method, is it safe to let it handle it's own mutex?
只有1个方法的类，它是安全的，让它处理它自己的锁？
Class with only 1 method, is it safe to let it handle it's own mutex?
只有1个方法的类，它是安全的，让它处理它自己的锁？
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