A call to pthread_cond_signal() (used by POSIX threads, called Pthread) releases the associated mutex lock.

Name: A call to pthread_cond_signal() (used by POSIX threads, called Pthread) releases the associated mutex lock.
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Quizplus · Accepted Answer

pthread_cond_signal() is used to signal another thread which is waiting on the condition variable, it does not release the mutex lock; the thread that called pthread_cond_signal() must explicitly release the mutex lock by calling pthread_mutex_unlock().

A Call to Pthread_cond_signal() (Used by POSIX Threads, Called Pthread)