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.\" $FreeBSD$ 29.\" 30.Dd February 15, 2000 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 libc 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.Xr sem_init 3 . 52.Sh RETURN VALUES 53.Rv -std sem_destroy 54.Sh ERRORS 55The 56.Fn sem_destroy 57function will fail if: 58.Bl -tag -width Er 59.It Bq Er EINVAL 60The 61.Fa sem 62argument 63points to an invalid semaphore. 64.It Bq Er EBUSY 65There are currently threads blocked on the semaphore that 66.Fa sem 67points to. 68.El 69.Sh SEE ALSO 70.Xr sem_init 3 71.Sh STANDARDS 72The 73.Fn sem_destroy 74function conforms to 75.St -p1003.1-96 . 76.Pp 77.Tn POSIX 78does not define the behavior of 79.Fn sem_destroy 80if called while there are threads blocked on 81.Fa sem , 82but this implementation is guaranteed to return \-1 and set 83.Va errno 84to 85.Er EBUSY 86if there are threads blocked on 87.Fa sem . 88