84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
|
|
* The President and Fellows of Harvard College.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _CLOCK_H_
|
|
#define _CLOCK_H_
|
|
|
|
/*
|
|
* Time-related definitions.
|
|
*/
|
|
|
|
#include <kern/time.h>
|
|
|
|
|
|
/*
|
|
* hardclock() is called on every CPU HZ times a second, possibly only
|
|
* when the CPU is not idle, for scheduling.
|
|
*/
|
|
|
|
/* hardclocks per second */
|
|
#define HZ 100
|
|
|
|
void hardclock_bootstrap(void);
|
|
void hardclock(void);
|
|
|
|
/*
|
|
* timerclock() is called on one CPU once a second to allow simple
|
|
* timed operations. (This is a fairly simpleminded interface.)
|
|
*/
|
|
void timerclock(void);
|
|
|
|
/*
|
|
* gettime() may be used to fetch the current time of day.
|
|
*/
|
|
void gettime(struct timespec *ret);
|
|
|
|
/*
|
|
* arithmetic on times
|
|
*
|
|
* add: ret = t1 + t2
|
|
* sub: ret = t1 - t2
|
|
*/
|
|
|
|
void timespec_add(const struct timespec *t1,
|
|
const struct timespec *t2,
|
|
struct timespec *ret);
|
|
void timespec_sub(const struct timespec *t1,
|
|
const struct timespec *t2,
|
|
struct timespec *ret);
|
|
|
|
/*
|
|
* clocksleep() suspends execution for the requested number of seconds,
|
|
* like userlevel sleep(3). (Don't confuse it with wchan_sleep.)
|
|
*/
|
|
void clocksleep(int seconds);
|
|
|
|
|
|
#endif /* _CLOCK_H_ */
|