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Annotation of OSKit-Mach/kern/time_stamp.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        _KERN_TIME_STAMP_H_
        !            28: #define _KERN_TIME_STAMP_H_
        !            29: 
        !            30: #include <machine/time_stamp.h>
        !            31: /*
        !            32:  *     time_stamp.h -- definitions for low-overhead timestamps.
        !            33:  */
        !            34: 
        !            35: struct tsval {
        !            36:        unsigned        low_val;        /* least significant word */
        !            37:        unsigned        high_val;       /* most significant word */
        !            38: };
        !            39: 
        !            40: /*
        !            41:  *     Format definitions.
        !            42:  */
        !            43: 
        !            44: #ifndef        TS_FORMAT
        !            45: /*
        !            46:  *     Default case - Just return a tick count for machines that
        !            47:  *     don't support or haven't implemented this.  Assume 100Hz ticks.
        !            48:  *
        !            49:  *     low_val - Always 0.
        !            50:  *     high_val - tick count.
        !            51:  */
        !            52: #define        TS_FORMAT       1
        !            53: 
        !            54: #if    KERNEL
        !            55: unsigned       ts_tick_count;
        !            56: #endif /* KERNEL */
        !            57: #endif /* TS_FORMAT */
        !            58: 
        !            59: /*
        !            60:  *     List of all format definitions for convert_ts_to_tv.
        !            61:  */
        !            62: 
        !            63: #define        TS_FORMAT_DEFAULT       1
        !            64: #define TS_FORMAT_MMAX         2
        !            65: #endif /* _KERN_TIME_STAMP_H_ */

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