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Annotation of OSKit-Mach/ipc/port.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University.
                      4:  * Copyright (c) 1993,1994 The University of Utah and
                      5:  * the Computer Systems Laboratory (CSL).
                      6:  * All rights reserved.
                      7:  *
                      8:  * Permission to use, copy, modify and distribute this software and its
                      9:  * documentation is hereby granted, provided that both the copyright
                     10:  * notice and this permission notice appear in all copies of the
                     11:  * software, derivative works or modified versions, and any portions
                     12:  * thereof, and that both notices appear in supporting documentation.
                     13:  *
                     14:  * CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
                     15:  * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
                     16:  * OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
                     17:  * THIS SOFTWARE.
                     18:  *
                     19:  * Carnegie Mellon requests users of this software to return to
                     20:  *
                     21:  *  Software Distribution Coordinator  or  [email protected]
                     22:  *  School of Computer Science
                     23:  *  Carnegie Mellon University
                     24:  *  Pittsburgh PA 15213-3890
                     25:  *
                     26:  * any improvements or extensions that they make and grant Carnegie Mellon
                     27:  * the rights to redistribute these changes.
                     28:  */
                     29: /*
                     30:  */
                     31: /*
                     32:  *     File:   ipc/ipc_port.h
                     33:  *     Author: Rich Draves
                     34:  *     Date:   1989
                     35:  *
                     36:  *     Implementation specific complement to mach/port.h.
                     37:  */
                     38: 
                     39: #ifndef        _IPC_PORT_H_
                     40: #define _IPC_PORT_H_
                     41: 
                     42: #include <mach/port.h>
                     43: 
                     44: /*
                     45:  *     mach_port_t must be an unsigned type.  Port values
                     46:  *     have two parts, a generation number and an index.
                     47:  *     These macros encapsulate all knowledge of how
                     48:  *     a mach_port_t is layed out.  However, ipc/ipc_entry.c
                     49:  *     implicitly assumes when it uses the splay tree functions
                     50:  *     that the generation number is in the low bits, so that
                     51:  *     names are ordered first by index and then by generation.
                     52:  *
                     53:  *     If the size of generation numbers changes,
                     54:  *     be sure to update IE_BITS_GEN_MASK and friends
                     55:  *     in ipc/ipc_entry.h.
                     56:  */
                     57: 
                     58: #if PORT_GENERATIONS
                     59: #define        MACH_PORT_INDEX(name)           ((name) >> 8)
                     60: #define        MACH_PORT_GEN(name)             (((name) & 0xff) << 24)
                     61: #define        MACH_PORT_MAKE(index, gen)      (((index) << 8) | ((gen) >> 24))
                     62: #else
                     63: #define        MACH_PORT_INDEX(name)           (name)
                     64: #define        MACH_PORT_GEN(name)             0
                     65: #define        MACH_PORT_MAKE(index, gen)      (index)
                     66: #endif
                     67: 
                     68: #define        MACH_PORT_NGEN(name)            MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
                     69: #define        MACH_PORT_MAKEB(index, bits)    MACH_PORT_MAKE(index, IE_BITS_GEN(bits))
                     70: 
                     71: /*
                     72:  *     Typedefs for code cleanliness.  These must all have
                     73:  *     the same (unsigned) type as mach_port_t.
                     74:  */
                     75: 
                     76: typedef mach_port_t mach_port_index_t;         /* index values */
                     77: typedef mach_port_t mach_port_gen_t;           /* generation numbers */
                     78: 
                     79: 
                     80: #define        MACH_PORT_UREFS_MAX     ((mach_port_urefs_t) ((1 << 16) - 1))
                     81: 
                     82: #define        MACH_PORT_UREFS_OVERFLOW(urefs, delta)                          \
                     83:                (((delta) > 0) &&                                       \
                     84:                 ((((urefs) + (delta)) <= (urefs)) ||                   \
                     85:                  (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
                     86: 
                     87: #define        MACH_PORT_UREFS_UNDERFLOW(urefs, delta)                         \
                     88:                (((delta) < 0) && (-(delta) > (urefs)))
                     89: 
                     90: #endif /* _IPC_PORT_H_ */

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