The break condition can be defined for the wait in the until function, or extend the wait class to implement.

可以在until函数中定义等待的退出条件，或者扩展wait类来实现等待退出。

youdao

The best way to do this is to use the pthread_cond_wait call to wait on a particular condition to become true.

解决这个问题的最佳方法是使用pthread_cond_wait调用来等待特殊条件发生。

youdao

Next, the reader thread needs to ensure (and this is the second check you perform) that it does not wait on the condition variable any more than the specified timeout period.

接下来，读线程需要确保(这是第二个检查)它等待条件变量的时间不超过指定的超时时间。

youdao

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