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.Dd July 28, 1998 29.Dt PTHREAD_COND_SIGNAL 3 30.Os 31.Sh NAME 32.Nm pthread_cond_signal 33.Nd unblock a thread waiting for a condition variable 34.Sh LIBRARY 35.Lb libpthread 36.Sh SYNOPSIS 37.In pthread.h 38.Ft int 39.Fn pthread_cond_signal "pthread_cond_t *cond" 40.Sh DESCRIPTION 41The 42.Fn pthread_cond_signal 43function unblocks one thread waiting for the condition variable 44.Fa cond . 45.Sh RETURN VALUES 46If successful, the 47.Fn pthread_cond_signal 48function will return zero, otherwise an error number will be returned 49to indicate the error. 50.Sh ERRORS 51The 52.Fn pthread_cond_signal 53function will fail if: 54.Bl -tag -width Er 55.It Bq Er EINVAL 56The value specified by 57.Fa cond 58is invalid. 59.El 60.Sh SEE ALSO 61.Xr pthread_cond_broadcast 3 , 62.Xr pthread_cond_destroy 3 , 63.Xr pthread_cond_init 3 , 64.Xr pthread_cond_timedwait 3 , 65.Xr pthread_cond_wait 3 66.Sh STANDARDS 67The 68.Fn pthread_cond_signal 69function conforms to 70.St -p1003.1-96 . 71