xnu-6153.11.26.tar.gz

[apple/xnu.git] / osfmk / mach / time_value.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
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/*
 * @OSF_COPYRIGHT@
 */
/*
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#ifndef _MACH_TIME_VALUE_H_
#define _MACH_TIME_VALUE_H_

#include <mach/machine/vm_types.h>

/*
 *	Time value returned by kernel.
 */

struct time_value {
	integer_t seconds;
	integer_t microseconds;
};

typedef struct time_value       time_value_t;

/*
 *	Macros to manipulate time values.  Assume that time values
 *	are normalized (microseconds <= 999999).
 */
#define TIME_MICROS_MAX (1000000)

#define time_value_add_usec(val, micros)        {       \
	if (((val)->microseconds += (micros))           \
	        >= TIME_MICROS_MAX) {                   \
	    (val)->microseconds -= TIME_MICROS_MAX;     \
	    (val)->seconds++;                           \
	}                                               \
}

#define time_value_add(result, addend)          {               \
	(result)->microseconds += (addend)->microseconds;       \
	(result)->seconds += (addend)->seconds;                 \
	if ((result)->microseconds >= TIME_MICROS_MAX) {        \
	    (result)->microseconds -= TIME_MICROS_MAX;          \
	    (result)->seconds++;                                \
	}                                                       \
}

#endif  /* _MACH_TIME_VALUE_H_ */