.\" Portions Copyright (c) 2001 Apple Computer, Inc. All Rights Reserved.
.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
.\" All rights reserved.
.\"
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.\" 3. Neither the name of the author nor the names of any co-contributors
.\"    may be used to endorse or promote products derived from this software
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.\" $FreeBSD: src/lib/libc_r/man/pthread_cond_wait.3,v 1.8.2.4 2001/08/17 15:42:51 ru Exp $
.\"
.Dd November 5, 2001
.Dt PTHREAD_COND_WAIT 3
.Os Darwin
.Sh NAME
.Nm pthread_cond_wait
.Nd wait on a condition variable
.Sh SYNOPSIS
.Fd #include <pthread.h>
.Ft int
.Fn pthread_cond_wait "pthread_cond_t *cond" "pthread_mutex_t *mutex"
.Sh DESCRIPTION
The
.Fn pthread_cond_wait
function atomically unlocks the 
.Fa mutex 
argument and waits on the 
.Fa cond
argument.
.Sh RETURN VALUES
If successful, the
.Fn pthread_cond_wait
function will return zero.
Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
.Fn pthread_cond_wait
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa cond
or the value specified by
.Fa mutex
is invalid.
.El
.Sh SEE ALSO
.Xr pthread_cond_broadcast 3 ,
.Xr pthread_cond_destroy 3 ,
.Xr pthread_cond_init 3 ,
.Xr pthread_cond_signal 3 ,
.Xr pthread_cond_timedwait 3
.Sh STANDARDS
.Fn pthread_cond_wait
conforms to
.St -p1003.1-96 .