PTHREAD_COND_WAIT(3)     BSD Library Functions Manual     PTHREAD_COND_WAIT(3)

NAME
     pthread_cond_wait -- wait on a condition variable

SYNOPSIS
     #include <pthread.h>

     int
     pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);

DESCRIPTION
     The pthread_cond_wait() function atomically blocks the current thread
     waiting on the condition variable specified by cond, and releases 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.

RETURN VALUES
     If successful, the pthread_cond_wait() function will return zero.  Other-
     wise an error number will be returned to indicate the error.

ERRORS
     The pthread_cond_wait() function will fail if:

     [EINVAL]           The value specified by cond or the value specified by
                        mutex is invalid.

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

STANDARDS
     The pthread_cond_wait() function conforms to ISO/IEC 9945-1:1996
     (``POSIX.1'').

Darwin                         February 16, 2006                        Darwin