sem_destroy3
Destroy an unnamed semaphore
Usage
#include <semaphore.h>
int sem_destroy(sem_t *sem);
Library
POSIX threads library (libpthread, -lpthread)
Overview
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 |
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.
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.