osx man page for pthread_cond_wait

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 *restrict cond, pthread_mutex_t *restrict mutex);

DESCRIPTION
     The pthread_cond_wait() function atomically unlocks the mutex and blocks the current thread on the condition specified by the cond argument.
     The current thread unblocks only after another thread calls pthread_cond_signal(3) or pthread_cond_broadcast(3) with the same condition vari-
     able.  The mutex must be locked before calling this function, otherwise the behavior is undefined. Before pthread_cond_wait() returns to the
     calling function, it re-acquires the mutex.

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

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

Darwin								 November 5, 2001							    Darwin