osfmk/mach/time_value.h

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