NAME
sem_destroy - destroy an unnamed semaphore
SYNOPSIS
#include <semaphore.h>
int sem_destroy(sem_t *sem);
Link with -lrt or -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.
CONFORMING TO
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 3.24 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/.