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time_value.h
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1997-04-27
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123 lines
/*
* 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.
*/
/*
* HISTORY
* $Log: time_value.h,v $
* Revision 2.6 93/01/24 14:13:24 danner
* Added include of mach/machine/vm_types.h to get definition
* of integer_t.
* [93/01/17 mrt]
*
* Revision 2.5 93/01/14 17:48:20 danner
* Standardized include symbol name.
* [92/06/10 pds]
* 64bit cleanup.
* [92/12/01 af]
*
* Revision 2.4 91/05/18 14:35:13 rpd
* Added mapped_time_value_t.
* [91/03/21 rpd]
*
* Revision 2.3 91/05/14 17:01:40 mrt
* Correcting copyright
*
* Revision 2.2 91/02/05 17:36:49 mrt
* Changed to new Mach copyright
* [91/02/01 17:22:07 mrt]
*
* Revision 2.1 89/08/03 16:06:24 rwd
* Created.
*
* Revision 2.4 89/02/25 18:41:34 gm0w
* Changes for cleanup.
*
* Revision 2.3 89/02/07 00:53:58 mwyoung
* Relocated from sys/time_value.h
*
* Revision 2.2 89/01/31 01:21:58 rpd
* TIME_MICROS_MAX should be 1 Million, not 10 Million.
* [88/10/12 dlb]
*
* 4-Jan-88 David Golub (dbg) at Carnegie-Mellon University
* Created.
*
*/
#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++; \
} \
}
/*
* Time value available through the mapped-time interface.
* Read this mapped value with
* do {
* secs = mtime->seconds;
* usecs = mtime->microseconds;
* } while (secs != mtime->check_seconds);
*/
typedef struct mapped_time_value {
integer_t seconds;
integer_t microseconds;
integer_t check_seconds;
} mapped_time_value_t;
#endif /* _MACH_TIME_VALUE_H_ */