sem_close()

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.

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:

POSIX 1003.1 SEM

Safety:  
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes

Last modified: 2013-12-23

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