现在，有两个线程需要使用这两个互斥量。
Now, imagine that two threads want to use them. Thread one does this.
如果可能，在设计程序时决不要锁定一个已经锁定的互斥量。
If possible, just design your program never to re-lock a mutex it already has.
如果线程2要运行，它就要锁定count _ mutex，而这个互斥量已经被线程1占有了。
If thread two runs, it'll want to lock count_mutex, which is held by thread one.
如果线程1要运行，它就要锁定rand _ mutex，可是这个互斥量已经被线程2阻塞了。
If thread one runs, it'll want to lock rand_mutex, which is held by thread two.
在厕所里重要的例子二进制信号量互斥的区别？
Difference between Binary Semaphore and Mutex in the toilet key example?
在厕所里重要的例子二进制信号量互斥的区别？
Difference between Binary Semaphore and Mutex in the toilet key example?
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