NAME¶
sem_destroy - destroy an unnamed semaphore
SYNOPSIS¶
#include <semaphore.h>
int sem_destroy(sem_t *sem);
Link with
-pthread.
DESCRIPTION¶
sem_destroy() destroys the unnamed semaphore at the address pointed to by
sem.
Only a semaphore that has been initialized by
sem_init(3) should be
destroyed using
sem_destroy().
Destroying a semaphore that other processes or threads are currently blocked on
(in
sem_wait(3)) produces undefined behavior.
Using a semaphore that has been destroyed produces undefined results, until the
semaphore has been reinitialized using
sem_init(3).
RETURN VALUE¶
sem_destroy() returns 0 on success; on error, -1 is returned, and
errno is set to indicate the error.
ERRORS¶
- EINVAL
- sem is not a valid semaphore.
ATTRIBUTES¶
Multithreading (see pthreads(7))¶
The
sem_destroy() function is thread-safe.
POSIX.1-2001.
NOTES¶
An unnamed semaphore should be destroyed with
sem_destroy() before the
memory in which it is located is deallocated. Failure to do this can result in
resource leaks on some implementations.
SEE ALSO¶
sem_init(3),
sem_post(3),
sem_wait(3),
sem_overview(7)
COLOPHON¶
This page is part of release 3.74 of the Linux
man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
