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	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_ */