sem_post — unlock a semaphore
#include <semaphore.h>
int
sem_post( |
sem_t * | sem); |
sem_post() increments
(unlocks) the semaphore pointed to by sem. If the semaphore's value
consequently becomes greater than zero, then another process
or thread blocked in a sem_wait(3) call will be
woken up and proceed to lock the semaphore.
sem_post() returns 0 on
success; on error, the value of the semaphore is left
unchanged, −1 is returned, and errno is set to indicate the error.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
t Copyright (C) 2006 Michael Kerrisk <mtk.manpagesgmail.com> Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |