from small one page howto to huge articles all in one place
poll results
Last additions:
May 25th. 2007:
April, 26th. 2006:
| You are here: manpages
SEM_POST
Section: Linux Programmer's Manual (3)
Updated: 2009-03-30
Index
Return to Main Contents
NAME
sem_post - unlock a semaphore
SYNOPSIS
#include <semaphore.h>
int sem_post(sem_t *sem);
Link with -lrt or -pthread.
DESCRIPTION
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.
RETURN VALUE
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.
ERRORS
- EINVAL
-
sem
is not a valid semaphore.
- EOVERFLOW
-
The maximum allowable value for a semaphore would be exceeded.
CONFORMING TO
POSIX.1-2001.
NOTES
sem_post()
is async-signal-safe:
it may be safely called within a signal handler.
EXAMPLE
See
sem_wait(3).
SEE ALSO
sem_getvalue(3),
sem_wait(3),
sem_overview(7)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- EXAMPLE
-
- SEE ALSO
-
- COLOPHON
-
Please read "Why adblockers are badwww.cars2fast4u.de
|
Other free services .
.
| 
|
|
- Running on 
-
:
: 
