table of contents
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 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.1-2008.
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¶
2023-03-30 | Linux man-pages 6.04 |