1.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the author nor the names of any co-contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" $FreeBSD$ 29.\" 30.Dd July 28, 1998 31.Dt PTHREAD_COND_SIGNAL 3 32.Os 33.Sh NAME 34.Nm pthread_cond_signal 35.Nd unblock a thread waiting for a condition variable 36.Sh LIBRARY 37.Lb libpthread 38.Sh SYNOPSIS 39.In pthread.h 40.Ft int 41.Fn pthread_cond_signal "pthread_cond_t *cond" 42.Sh DESCRIPTION 43The 44.Fn pthread_cond_signal 45function unblocks one thread waiting for the condition variable 46.Fa cond . 47.Sh RETURN VALUES 48If successful, the 49.Fn pthread_cond_signal 50function will return zero, otherwise an error number will be returned 51to indicate the error. 52.Sh ERRORS 53The 54.Fn pthread_cond_signal 55function will fail if: 56.Bl -tag -width Er 57.It Bq Er EINVAL 58The value specified by 59.Fa cond 60is invalid. 61.El 62.Sh SEE ALSO 63.Xr pthread_cond_broadcast 3 , 64.Xr pthread_cond_destroy 3 , 65.Xr pthread_cond_init 3 , 66.Xr pthread_cond_timedwait 3 , 67.Xr pthread_cond_wait 3 68.Sh STANDARDS 69The 70.Fn pthread_cond_signal 71function conforms to 72.St -p1003.1-96 . 73