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sem_destroy(3) Library Functions Manual sem_destroy(3)
NAME
sem_destroy - destroy an unnamed semaphore
LIBRARY
POSIX threads library (libpthread, -lpthread)
SYNOPSIS
#include <semaphore.h>
int sem_destroy(sem_t *sem);
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 de-
stroyed 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
For an explanation of the terms used in this section, see at-
tributes(7).
+--------------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------------------------------+---------------+---------+
|sem_destroy() | Thread safety | MT-Safe |
+--------------------------------------------+---------------+---------+
STANDARDS
POSIX.1-2008.
HISTORY
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)
Linux man-pages 6.04 2023-03-30 sem_destroy(3)
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