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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 rpc_time_value {
/* TODO: this should be 64 bits regardless of the arch to be Y2038 proof. */
rpc_long_integer_t seconds;
integer_t microseconds;
};
typedef struct rpc_time_value rpc_time_value_t;
/*
* Time value used by kernel interfaces. Ideally they should be migrated
* to use time_value64 below.
*/
struct time_value {
long_integer_t seconds;
integer_t microseconds;
};
typedef struct time_value time_value_t;
/*
* Time value used internally by the kernel that uses 64 bits to track seconds
* and nanoseconds. Note that the current resolution is only microseconds.
*/
struct time_value64 {
int64_t seconds;
int64_t nanoseconds;
};
typedef struct time_value64 time_value64_t;
/**
* Functions used by Mig to perform user to kernel conversion and vice-versa.
* We only do this because we may run a 64 bit kernel with a 32 bit user space.
*/
static __inline__ rpc_time_value_t convert_time_value_to_user(time_value_t tv)
{
rpc_time_value_t user = {.seconds = tv.seconds, .microseconds = tv.microseconds};
return user;
}
static __inline__ time_value_t convert_time_value_from_user(rpc_time_value_t tv)
{
time_value_t kernel = {.seconds = tv.seconds, .microseconds = tv.microseconds};
return kernel;
}
/*
* Macros to manipulate time values. Assume that time values
* are normalized (microseconds <= 999999).
*/
#define TIME_MICROS_MAX (1000000)
#define TIME_NANOS_MAX (1000000000)
#define time_value_assert(val) \
assert(0 <= (val)->microseconds && (val)->microseconds < TIME_MICROS_MAX);
#define time_value64_assert(val) \
assert(0 <= (val)->nanoseconds && (val)->nanoseconds < TIME_NANOS_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_value64_add_nanos(val, nanos) { \
time_value64_assert(val); \
if (((val)->nanoseconds += (nanos)) \
>= TIME_NANOS_MAX) { \
(val)->nanoseconds -= TIME_NANOS_MAX; \
(val)->seconds++; \
} \
time_value64_assert(val); \
}
#define time_value64_sub_nanos(val, nanos) { \
time_value64_assert(val); \
if (((val)->nanoseconds -= (nanos)) < 0) { \
(val)->nanoseconds += TIME_NANOS_MAX; \
(val)->seconds--; \
} \
time_value64_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_value64_add(result, addend) { \
time_value64_assert(addend); \
(result)->seconds += (addend)->seconds; \
time_value64_add_nanos(result, (addend)->nanoseconds); \
}
#define time_value64_sub(result, subtrahend) { \
time_value64_assert(subtrahend); \
(result)->seconds -= (subtrahend)->seconds; \
time_value64_sub_nanos(result, (subtrahend)->nanoseconds); \
}
#define TIME_VALUE64_TO_TIME_VALUE(tv64, tv) do { \
(tv)->seconds = (tv64)->seconds; \
(tv)->microseconds = (tv64)->nanoseconds / 1000; \
} while(0)
#define TIME_VALUE_TO_TIME_VALUE64(tv, tv64) do { \
(tv64)->seconds = (tv)->seconds; \
(tv64)->nanoseconds = (tv)->microseconds * 1000; \
} while(0)
/*
* Time value available through the mapped-time interface.
* Read this mapped value with
* do {
* secs = mtime->seconds;
* __sync_synchronize();
* usecs = mtime->microseconds;
* __sync_synchronize();
* } while (secs != mtime->check_seconds);
*/
typedef struct mapped_time_value {
integer_t seconds;
integer_t microseconds;
integer_t check_seconds;
struct time_value64 time_value;
int64_t check_seconds64;
} mapped_time_value_t;
/* Macros for converting between struct timespec and time_value_t. */
#define TIME_VALUE_TO_TIMESPEC(tv, ts) do { \
(ts)->tv_sec = (tv)->seconds; \
(ts)->tv_nsec = (tv)->microseconds * 1000; \
} while(0)
#define TIMESPEC_TO_TIME_VALUE(tv, ts) do { \
(tv)->seconds = (ts)->tv_sec; \
(tv)->microseconds = (ts)->tv_nsec / 1000; \
} while(0)
#endif /* _MACH_TIME_VALUE_H_ */
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