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int sem_destroy(sem_t *sem);
Link with -pthread.
sem_destroy() destroys the unnamed semaphore at the address pointed to
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).
sem_destroy() returns 0 on success; on error, -1 is returned, and errno
is set to indicate the error.
EINVAL sem is not a valid semaphore.
Multithreading (see pthreads(7))
The sem_destroy() function is thread-safe.
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)
Linux 2014-03-03 SEM_DESTROY(3)