osfmk/mach/time_value.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58
  59 #ifndef _MACH_TIME_VALUE_H_
  60 #define _MACH_TIME_VALUE_H_
  61
  62 #include <mach/machine/vm_types.h>
  63
  64 /*
  65  *      Time value returned by kernel.
  66  */
  67
  68 struct time_value {
  69         integer_t seconds;
  70         integer_t microseconds;
  71 };
  72
  73 typedef struct time_value       time_value_t;
  74
  75 /*
  76  *      Macros to manipulate time values.  Assume that time values
  77  *      are normalized (microseconds <= 999999).
  78  */
  79 #define TIME_MICROS_MAX (1000000)
  80
  81 #define time_value_add_usec(val, micros)        {       \
  82         if (((val)->microseconds += (micros))           \
  83                 >= TIME_MICROS_MAX) {                   \
  84             (val)->microseconds -= TIME_MICROS_MAX;     \
  85             (val)->seconds++;                           \
  86         }                                               \
  87 }
  88
  89 #define time_value_add(result, addend)          {               \
  90         (result)->microseconds += (addend)->microseconds;       \
  91         (result)->seconds += (addend)->seconds;                 \
  92         if ((result)->microseconds >= TIME_MICROS_MAX) {        \
  93             (result)->microseconds -= TIME_MICROS_MAX;          \
  94             (result)->seconds++;                                \
  95         }                                                       \
  96 }
  97
  98 #endif  /* _MACH_TIME_VALUE_H_ */