.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
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.\" $FreeBSD: head/share/man/man3/pthread_cond_signal.3 172880 2007-10-22 10:08:01Z ru $
.\"
.Dd July 28, 1998
.Dt PTHREAD_COND_SIGNAL 3
.Os
.Sh NAME
.Nm pthread_cond_signal
.Nd unblock a thread waiting for a condition variable
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_cond_signal "pthread_cond_t *cond"
.Sh DESCRIPTION
The
.Fn pthread_cond_signal
function unblocks one thread waiting for the condition variable
.Fa cond .
.Sh RETURN VALUES
If successful, the
.Fn pthread_cond_signal
function will return zero, otherwise an error number will be returned
to indicate the error.
.Sh ERRORS
The
.Fn pthread_cond_signal
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa cond
is invalid.
.El
.Sh SEE ALSO
.Xr pthread_cond_broadcast 3 ,
.Xr pthread_cond_destroy 3 ,
.Xr pthread_cond_init 3 ,
.Xr pthread_cond_timedwait 3 ,
.Xr pthread_cond_wait 3
.Sh STANDARDS
The
.Fn pthread_cond_signal
function conforms to
.St -p1003.1-96 .