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Annotation of OSKit-Mach/kern/time_stamp.h, revision 1.1.1.1

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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