time_value.h

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    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  Software.Distribution@CS.CMU.EDU
   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  * HISTORY
   28  * $Log:        time_value.h,v $
   29  * Revision 2.6  93/01/24  14:13:24  danner
   30  *      Added include of mach/machine/vm_types.h to get definition
   31  *      of integer_t.
   32  *      [93/01/17            mrt]
   33  * 
   34  * Revision 2.5  93/01/14  17:48:20  danner
   35  *      Standardized include symbol name.
   36  *      [92/06/10            pds]
   37  *      64bit cleanup.
   38  *      [92/12/01            af]
   39  * 
   40  * Revision 2.4  91/05/18  14:35:13  rpd
   41  *      Added mapped_time_value_t.
   42  *      [91/03/21            rpd]
   43  * 
   44  * Revision 2.3  91/05/14  17:01:40  mrt
   45  *      Correcting copyright
   46  * 
   47  * Revision 2.2  91/02/05  17:36:49  mrt
   48  *      Changed to new Mach copyright
   49  *      [91/02/01  17:22:07  mrt]
   50  * 
   51  * Revision 2.1  89/08/03  16:06:24  rwd
   52  * Created.
   53  * 
   54  * Revision 2.4  89/02/25  18:41:34  gm0w
   55  *      Changes for cleanup.
   56  * 
   57  * Revision 2.3  89/02/07  00:53:58  mwyoung
   58  * Relocated from sys/time_value.h
   59  * 
   60  * Revision 2.2  89/01/31  01:21:58  rpd
   61  *      TIME_MICROS_MAX should be 1 Million, not 10 Million.
   62  *      [88/10/12            dlb]
   63  * 
   64  *  4-Jan-88  David Golub (dbg) at Carnegie-Mellon University
   65  *      Created.
   66  *
   67  */
   68 
   69 #ifndef _MACH_TIME_VALUE_H_
   70 #define _MACH_TIME_VALUE_H_
   71 
   72 #include <mach/machine/vm_types.h>
   73 
   74 /*
   75  *      Time value returned by kernel.
   76  */
   77 
   78 struct time_value {
   79         integer_t       seconds;
   80         integer_t       microseconds;
   81 };
   82 typedef struct time_value       time_value_t;
   83 
   84 /*
   85  *      Macros to manipulate time values.  Assume that time values
   86  *      are normalized (microseconds <= 999999).
   87  */
   88 #define TIME_MICROS_MAX (1000000)
   89 
   90 #define time_value_add_usec(val, micros)        {       \
   91         if (((val)->microseconds += (micros))           \
   92                 >= TIME_MICROS_MAX) {                   \
   93             (val)->microseconds -= TIME_MICROS_MAX;     \
   94             (val)->seconds++;                           \
   95         }                                               \
   96 }
   97 
   98 #define time_value_add(result, addend)          {               \
   99         (result)->microseconds += (addend)->microseconds;       \
  100         (result)->seconds += (addend)->seconds;                 \
  101         if ((result)->microseconds >= TIME_MICROS_MAX) {        \
  102             (result)->microseconds -= TIME_MICROS_MAX;          \
  103             (result)->seconds++;                                \
  104         }                                                       \
  105 }
  106 
  107 /*
  108  *      Time value available through the mapped-time interface.
  109  *      Read this mapped value with
  110  *              do {
  111  *                      secs = mtime->seconds;
  112  *                      usecs = mtime->microseconds;
  113  *              } while (secs != mtime->check_seconds);
  114  */
  115 
  116 typedef struct mapped_time_value {
  117         integer_t seconds;
  118         integer_t microseconds;
  119         integer_t check_seconds;
  120 } mapped_time_value_t;
  121 
  122 #endif  /* _MACH_TIME_VALUE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/mach/time_value.h

FreeBSD/Linux Kernel Cross Reference
sys/mach/time_value.h