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.Dd February 15, 2000 30.Dt SEM_DESTROY 3 31.Os 32.Sh NAME 33.Nm sem_destroy 34.Nd destroy an unnamed semaphore 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In semaphore.h 39.Ft int 40.Fn sem_destroy "sem_t *sem" 41.Sh DESCRIPTION 42The 43.Fn sem_destroy 44function destroys the unnamed semaphore pointed to by 45.Fa sem . 46After a successful call to 47.Fn sem_destroy , 48.Fa sem 49is unusable until re-initialized by another call to 50.Fn sem_init . 51.Sh RETURN VALUES 52.Rv -std sem_destroy 53.Sh ERRORS 54The 55.Fn sem_destroy 56function will 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.Xr sem 4 69.Sh STANDARDS 70The 71.Fn sem_destroy 72function conforms to 73.St -p1003.1-96 . 74.Pp 75POSIX does not define the behavior of 76.Fn sem_destroy 77if called while there are threads blocked on 78.Fa sem , 79but this implementation is guaranteed to return -1 and set 80.Va errno 81to 82.Er EBUSY 83if there are threads blocked on 84.Fa sem . 85