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
66struct time_value {
67 integer_t seconds;
68 integer_t microseconds;
69};
70
71typedef 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_ */
97