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Annotation of kernel/mach/time_value.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989,1988,1987 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: #ifndef        _MACH_TIME_VALUE_H_
        !            52: #define        _MACH_TIME_VALUE_H_
        !            53: 
        !            54: #include <mach/machine/vm_types.h>
        !            55: 
        !            56: /*
        !            57:  *     Time value returned by kernel.
        !            58:  */
        !            59: 
        !            60: struct time_value {
        !            61:        integer_t       seconds;
        !            62:        integer_t       microseconds;
        !            63: };
        !            64: typedef        struct time_value       time_value_t;
        !            65: 
        !            66: /*
        !            67:  *     Macros to manipulate time values.  Assume that time values
        !            68:  *     are normalized (microseconds <= 999999).
        !            69:  */
        !            70: #define        TIME_MICROS_MAX (1000000)
        !            71: 
        !            72: #define        time_value_add_usec(val, micros)        {       \
        !            73:        if (((val)->microseconds += (micros))           \
        !            74:                >= TIME_MICROS_MAX) {                   \
        !            75:            (val)->microseconds -= TIME_MICROS_MAX;     \
        !            76:            (val)->seconds++;                           \
        !            77:        }                                               \
        !            78: }
        !            79: 
        !            80: #define        time_value_add(result, addend)          {               \
        !            81:        (result)->microseconds += (addend)->microseconds;       \
        !            82:        (result)->seconds += (addend)->seconds;                 \
        !            83:        if ((result)->microseconds >= TIME_MICROS_MAX) {        \
        !            84:            (result)->microseconds -= TIME_MICROS_MAX;          \
        !            85:            (result)->seconds++;                                \
        !            86:        }                                                       \
        !            87: }
        !            88: 
        !            89: /*
        !            90:  *     Time value available through the mapped-time interface.
        !            91:  *     Read this mapped value with
        !            92:  *             do {
        !            93:  *                     secs = mtime->seconds;
        !            94:  *                     usecs = mtime->microseconds;
        !            95:  *             } while (secs != mtime->check_seconds);
        !            96:  */
        !            97: 
        !            98: typedef struct mapped_time_value {
        !            99:        integer_t seconds;
        !           100:        integer_t microseconds;
        !           101:        integer_t check_seconds;
        !           102: } mapped_time_value_t;
        !           103: 
        !           104: #endif /* _MACH_TIME_VALUE_H_ */

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