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/**
* @file
*
* @brief Close a Named Semaphore
* @ingroup POSIX_SEMAPHORE
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/semaphoreimpl.h>
int sem_close( sem_t *sem )
{
POSIX_Semaphore_Control *the_semaphore;
uint32_t open_count;
POSIX_SEMAPHORE_VALIDATE_OBJECT( sem );
if ( !_POSIX_Semaphore_Is_named( sem ) ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
the_semaphore = _POSIX_Semaphore_Get( sem );
_Objects_Allocator_lock();
open_count = the_semaphore->open_count;
if ( open_count == 0 ) {
_Objects_Allocator_unlock();
rtems_set_errno_and_return_minus_one( EINVAL );
}
if ( open_count == 1 && _POSIX_Semaphore_Is_busy( sem ) ) {
_Objects_Allocator_unlock();
rtems_set_errno_and_return_minus_one( EBUSY );
}
the_semaphore->open_count = open_count - 1;
_POSIX_Semaphore_Delete( the_semaphore );
_Objects_Allocator_unlock();
return 0;
}
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