/*
 * Copyright (c) 2000 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

#include "sem.h"

/*
 * Close a Named Semaphore
 */
int
oskit_sem_close(sem_t *sem)
{
	int enabled;

	/* Lock the semaphore name space */
	pthread_mutex_lock(&semn_space.semn_lock);

	save_preemption_enable(enabled);
	disable_preemption();
	pthread_lock(&sem->sem_lock);

	if (--(sem->sem_refcount) == 0 && (sem->sem_flag & SEM_UNLINK_FLAG)) {
		/* Remove the semaphore */
		sem_remove(sem);
	} else {
		/* Unlock the semaphore */
		pthread_unlock(&sem->sem_lock);
	}
	restore_preemption_enable(enabled);
	pthread_mutex_unlock(&semn_space.semn_lock);

	return 0;
}