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Annotation of XNU/osfmk/ipc/port.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  */
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: /*
                     51:  */
                     52: /*
                     53:  *     File:   ipc/ipc_port.h
                     54:  *     Author: Rich Draves
                     55:  *     Date:   1989
                     56:  *
                     57:  *     Implementation specific complement to mach/port.h.
                     58:  */
                     59: 
                     60: #ifndef        _IPC_PORT_H_
                     61: #define _IPC_PORT_H_
                     62: 
                     63: #include <mach/port.h>
                     64: 
                     65: #define        MACH_PORT_NGEN(name)            MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
                     66: 
                     67: /*
                     68:  *     Typedefs for code cleanliness.  These must all have
                     69:  *     the same (unsigned) type as mach_port_name_t.
                     70:  */
                     71: 
                     72: typedef mach_port_name_t mach_port_index_t;            /* index values */
                     73: typedef mach_port_name_t mach_port_gen_t;              /* generation numbers */
                     74: 
                     75: 
                     76: #define        MACH_PORT_UREFS_MAX     ((mach_port_urefs_t) ((1 << 16) - 1))
                     77: 
                     78: #define        MACH_PORT_UREFS_OVERFLOW(urefs, delta)                          \
                     79:                (((delta) > 0) &&                                       \
                     80:                 ((((urefs) + (delta)) <= (urefs)) ||                   \
                     81:                  (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
                     82: 
                     83: #define        MACH_PORT_UREFS_UNDERFLOW(urefs, delta)                         \
                     84:                (((delta) < 0) && (-(delta) > (urefs)))
                     85: 
                     86: #endif /* _IPC_PORT_H_ */

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