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Annotation of OSKit-Mach/include/mach/time_value.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: 
        !            27: #ifndef        _MACH_TIME_VALUE_H_
        !            28: #define        _MACH_TIME_VALUE_H_
        !            29: 
        !            30: #include <mach/machine/vm_types.h>
        !            31: 
        !            32: /*
        !            33:  *     Time value returned by kernel.
        !            34:  */
        !            35: 
        !            36: struct time_value {
        !            37:        integer_t       seconds;
        !            38:        integer_t       microseconds;
        !            39: };
        !            40: typedef        struct time_value       time_value_t;
        !            41: 
        !            42: /*
        !            43:  *     Macros to manipulate time values.  Assume that time values
        !            44:  *     are normalized (microseconds <= 999999).
        !            45:  */
        !            46: #define        TIME_MICROS_MAX (1000000)
        !            47: 
        !            48: #define        time_value_add_usec(val, micros)        {       \
        !            49:        if (((val)->microseconds += (micros))           \
        !            50:                >= TIME_MICROS_MAX) {                   \
        !            51:            (val)->microseconds -= TIME_MICROS_MAX;     \
        !            52:            (val)->seconds++;                           \
        !            53:        }                                               \
        !            54: }
        !            55: 
        !            56: #define        time_value_add(result, addend)          {               \
        !            57:        (result)->microseconds += (addend)->microseconds;       \
        !            58:        (result)->seconds += (addend)->seconds;                 \
        !            59:        if ((result)->microseconds >= TIME_MICROS_MAX) {        \
        !            60:            (result)->microseconds -= TIME_MICROS_MAX;          \
        !            61:            (result)->seconds++;                                \
        !            62:        }                                                       \
        !            63: }
        !            64: 
        !            65: /*
        !            66:  *     Time value available through the mapped-time interface.
        !            67:  *     Read this mapped value with
        !            68:  *             do {
        !            69:  *                     secs = mtime->seconds;
        !            70:  *                     usecs = mtime->microseconds;
        !            71:  *             } while (secs != mtime->check_seconds);
        !            72:  */
        !            73: 
        !            74: typedef struct mapped_time_value {
        !            75:        integer_t seconds;
        !            76:        integer_t microseconds;
        !            77:        integer_t check_seconds;
        !            78: } mapped_time_value_t;
        !            79: 
        !            80: #endif /* _MACH_TIME_VALUE_H_ */

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