time_value.h (3570B) - Raw
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_ */