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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University.
* Copyright (c) 1993,1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* 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, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
* THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM 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/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>
/*
* mach_port_t must be an unsigned type. Port values
* have two parts, a generation number and an index.
* These macros encapsulate all knowledge of how
* a mach_port_t is layed out. However, ipc/ipc_entry.c
* implicitly assumes when it uses the splay tree functions
* that the generation number is in the low bits, so that
* names are ordered first by index and then by generation.
*
* If the size of generation numbers changes,
* be sure to update IE_BITS_GEN_MASK and friends
* in ipc/ipc_entry.h.
*/
#if PORT_GENERATIONS
#define MACH_PORT_INDEX(name) ((name) >> 8)
#define MACH_PORT_GEN(name) (((name) & 0xff) << 24)
#define MACH_PORT_MAKE(index, gen) (((index) << 8) | ((gen) >> 24))
#else
#define MACH_PORT_INDEX(name) (name)
#define MACH_PORT_GEN(name) 0
#define MACH_PORT_MAKE(index, gen) (index)
#endif
#define MACH_PORT_NGEN(name) MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
#define MACH_PORT_MAKEB(index, bits) MACH_PORT_MAKE(index, IE_BITS_GEN(bits))
/*
* Typedefs for code cleanliness. These must all have
* the same (unsigned) type as mach_port_t.
*/
typedef mach_port_t mach_port_index_t; /* index values */
typedef mach_port_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_ */
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