2 .\" Hey Emacs! This file is -*- nroff -*- source.
4 .\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
6 .\" Permission is granted to make and distribute verbatim copies of this
7 .\" manual provided the copyright notice and this permission notice are
8 .\" preserved on all copies.
10 .\" Permission is granted to copy and distribute modified versions of this
11 .\" manual under the conditions for verbatim copying, provided that the
12 .\" entire resulting derived work is distributed under the terms of a
13 .\" permission notice identical to this one.
15 .\" Since the Linux kernel and libraries are constantly changing, this
16 .\" manual page may be incorrect or out-of-date. The author(s) assume no
17 .\" responsibility for errors or omissions, or for damages resulting from
18 .\" the use of the information contained herein. The author(s) may not
19 .\" have taken the same level of care in the production of this manual,
20 .\" which is licensed free of charge, as they might when working
23 .\" Formatted or processed versions of this manual, if unaccompanied by
24 .\" the source, must acknowledge the copyright and authors of this work.
26 .TH SEM_DESTROY 3 2006-03-25 "Linux" "Linux Programmer's Manual"
28 sem_destroy \- destroy an unnamed semaphore
31 .B #include <semaphore.h>
33 .BI "int sem_destroy(sem_t *" sem );
36 Link with \fI\-lrt\fP or \fI\-pthread\fP.
39 destroys the unnamed semaphore at the address pointed to by
42 Only a semaphore that has been initialized by
44 should be destroyed using
47 Destroying a semaphore that other processes or threads are
48 currently blocked on (in
50 produces undefined behavior.
52 Using a semaphore that has been destroyed produces undefined results,
53 until the semaphore has been reinitialized using
58 on error, \-1 is returned, and
60 is set to indicate the error.
65 is not a valid semaphore.
69 An unnamed semaphore should be destroyed with
71 before the memory in which it is located is deallocated.
72 Failure to do this can result in resource leaks on some implementations.
73 .\" But not on NPTL, where sem_destroy () is a no-op..