1.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. 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(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 20.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 26.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" $FreeBSD: src/lib/libc_r/man/sem_destroy.3,v 1.1.2.8 2002/12/29 16:35:35 schweikh Exp $ 29.\" $DragonFly: src/lib/libc_r/man/sem_destroy.3,v 1.2 2003/06/17 04:26:48 dillon Exp $ 30.Dd April 15, 2009 31.Dt SEM_DESTROY 3 32.Os 33.Sh NAME 34.Nm sem_destroy 35.Nd destroy an unnamed semaphore 36.Sh LIBRARY 37.Lb libpthread 38.Sh SYNOPSIS 39.In semaphore.h 40.Ft int 41.Fn sem_destroy "sem_t *sem" 42.Sh DESCRIPTION 43The 44.Fn sem_destroy 45function destroys the unnamed semaphore pointed to by 46.Fa sem . 47After a successful call to 48.Fn sem_destroy , 49.Fa sem 50is unusable until re-initialized by another call to 51.Fn sem_init . 52.Sh RETURN VALUES 53.Rv -std sem_destroy 54.Sh ERRORS 55.Fn sem_destroy 56will fail if: 57.Bl -tag -width Er 58.It Bq Er EINVAL 59.Fa sem 60points to an invalid semaphore. 61.It Bq Er EBUSY 62There are currently threads blocked on the semaphore that 63.Fa sem 64points to. 65.El 66.Sh SEE ALSO 67.Xr sem_init 3 68.Sh STANDARDS 69.Fn sem_destroy 70conforms to 71.St -p1003.1-96 . 72.Pp 73POSIX does not define the behavior of 74.Fn sem_destroy 75if called while there are threads blocked on 76.Fa sem , 77but this implementation is guaranteed to return -1 and set 78.Va errno 79to 80.Er EBUSY 81if there are threads blocked on 82.Fa sem . 83