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Destroy a semaphore
#include <semaphore.h>
int sem_destroy( sem_t * sem );
- sem
- A pointer to the sem_t object for the semaphore that
you want to destroy.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The sem_destroy() function destroys the unnamed semaphore
referred to by the sem argument. The semaphore must have been
previously initialized by the
sem_init() function.
The effect of using a semaphore after it has been destroyed is
undefined.
If you destroy a semaphore that other processes are currently blocked on,
they're unblocked, with an error (EINVAL).
|
Don't mix named semaphore operations
(sem_open()
and
sem_close())
with unnamed semaphore operations (sem_init() and
sem_destroy()) on the same semaphore. |
- 0
- Success.
- -1
- An error occurred
(errno is set).
- EINVAL
- Invalid semaphore descriptor sem.
POSIX 1003.1 SEM
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
sem_init(),
sem_post(),
sem_trywait(),
sem_wait()
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