Does pthread_cond_signal function unlock the mutex the calling thread locked?

Only the mutex given to pthread_cond_(timed_)wait() is unlocked to give other threads the chance to change the condition. At the end of pthread_cond_wait, the mutex is locked again No other functions lock/unlock mutexes.

Only the mutex given to pthread_cond_(timed_)wait() is unlocked to give other threads the chance to change the condition. At the end of pthread_cond_wait, the mutex is locked again. No other functions lock/unlock mutexes.

No, it doesn't unlock any mutex at all. Pthread_cond_wait does unlock its mutex, and when it exits the mutex is locked again.

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