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Name

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

Multithreading (see pthreads(7) )

The sem_destroy() function is thread-safe.

Conforming to

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

sem_init(3) , sem_post(3) , sem_wait(3) , sem_overview(7)

Colophon

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