sem_close()
QNX SDP8.0C Library ReferenceAPIDeveloper
Close a named semaphore
Synopsis:
#include <semaphore.h>
int sem_close( sem_t * sem );
Arguments:
- sem
- A pointer to a semaphore, as returned by sem_open().
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The sem_close() function closes the named semaphore sem opened by sem_open(), releasing any system resources associated with the sem.
Note:
Don't mix named semaphore operations
(sem_open() and sem_close())
with unnamed semaphore operations
(sem_init()
and
sem_destroy())
on the same semaphore.
Returns:
- 0
- Success.
- -1
- An error occurred (errno is set).
Errors:
- EINVAL
- Invalid semaphore descriptor sem.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
Page updated: