sem_destroy
Section: C Library Functions (3)
Updated: 2022-12-15
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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 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
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
sem_destroy()
| Thread safety | MT-Safe
|
STANDARDS
POSIX.1-2001, POSIX.1-2008.
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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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