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/*
* 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_assert(val) \
assert(0 <= (val)->microseconds && (val)->microseconds < TIME_MICROS_MAX);
#define time_value_add_usec(val, micros) { \
time_value_assert(val); \
if (((val)->microseconds += (micros)) \
>= TIME_MICROS_MAX) { \
(val)->microseconds -= TIME_MICROS_MAX; \
(val)->seconds++; \
} \
time_value_assert(val); \
}
#define time_value_sub_usec(val, micros) { \
time_value_assert(val); \
if (((val)->microseconds -= (micros)) < 0) { \
(val)->microseconds += TIME_MICROS_MAX; \
(val)->seconds--; \
} \
time_value_assert(val); \
}
#define time_value_add(result, addend) { \
time_value_assert(addend); \
(result)->seconds += (addend)->seconds; \
time_value_add_usec(result, (addend)->microseconds); \
}
#define time_value_sub(result, subtrahend) { \
time_value_assert(subtrahend); \
(result)->seconds -= (subtrahend)->seconds; \
time_value_sub_usec(result, (subtrahend)->microseconds); \
}
/*
* 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_ */
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