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PTHREAD_COND_WAIT(3) Library Functions Manual PTHREAD_COND_WAIT(3)

wait on a condition variable

#include <pthread.h>
pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);

The pthread_cond_wait() function atomically blocks the current thread waiting on the condition variable specified by cond, and unblocks the mutex specified by mutex. The waiting thread unblocks only after another thread calls pthread_cond_signal(3), or pthread_cond_broadcast(3) with the same condition variable, and the current thread reacquires the lock on mutex.

If successful, the pthread_cond_wait() function will return zero. Otherwise an error number will be returned to indicate the error.

pthread_cond_wait() will fail if:
The value specified by cond or the value specified by mutex is invalid.

pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_signal(3), pthread_cond_timedwait(3)

pthread_cond_wait() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
June 5, 2013 OpenBSD-current