Once pthread_cond_wait() has the lock, it will then return and allow thread 1 to continue execution.
一旦 pthread_cond_wait()锁定了互斥对象，那么它将返回并允许1 号线程继续执行。
Once pthread_cond_wait() has the lock, it will then return and allow thread 1 to continue execution.
一旦 pthread_cond_wait()锁定了互斥对象，那么它将返回并允许1 号线程继续执行。
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