/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 *	File:	ipc/ipc_port.h
 *	Author:	Rich Draves
 *	Date:	1989
 *
 *	Implementation specific complement to mach/port.h.
 */

#ifndef	_IPC_PORT_H_
#define _IPC_PORT_H_

#include <mach/port.h>

#define	MACH_PORT_NGEN(name)		MACH_PORT_MAKE(0, MACH_PORT_GEN(name))

/*
 *	Typedefs for code cleanliness.  These must all have
 *	the same (unsigned) type as mach_port_name_t.
 */

typedef mach_port_name_t mach_port_index_t;		/* index values */
typedef mach_port_name_t mach_port_gen_t;		/* generation numbers */


#define	MACH_PORT_UREFS_MAX	((mach_port_urefs_t) ((1 << 16) - 1))

#define	MACH_PORT_UREFS_OVERFLOW(urefs, delta)				\
		(((delta) > 0) &&					\
		 ((((urefs) + (delta)) <= (urefs)) ||			\
		  (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))

#define	MACH_PORT_UREFS_UNDERFLOW(urefs, delta)				\
		(((delta) < 0) && (-(delta) > (urefs)))

#endif	/* _IPC_PORT_H_ */
