sem_destroy — destroy an unnamed semaphore
Synopsis
#include <semaphore.h> int sem_destroy(sem_t *sem);
Link with -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.
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
|---|---|---|
| sem_destroy() | Thread safety | MT-Safe |
Conforming to
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
Colophon
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