GNU/Linux man pages
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GNU/Linux |
CentOS 5.1 |
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sem_destroy(3) |
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sem_destroy − destroy an unnamed semaphore
#include <semaphore.h>
int sem_destroy(sem_t *sem);
sem_destroy() destroys the unnamed semaphore at the address pointed to by sem.
Only a semaphore that has been initialised 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 behaviour.
Using a semaphore that has been destroyed produces undefined results, until the semaphore has been reinitialised using sem_init(3).
sem_destroy() returns 0 on success; on error, −1 is returned, and errno is set to indicate the error.
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EINVAL |
sem is not a valid semaphore. |
POSIX.1-2001.
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.
sem_init(3), sem_post(3), sem_wait(3), sem_overview(7)
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sem_destroy(3) | |