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/* timer.h - Interface to a timer module for Mach.
Copyright (C) 1995,96,2000,02 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG and Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#ifndef _TIMER_H_
#define _TIMER_H_
#include <errno.h>
#include <maptime.h>
/* Initialize the timer component. Must be called once at startup. */
error_t timer_init (void);
/* The data structure of a timer. A user can set the values EXPIRES,
DATA and FUNCTION, and should leave the other fields alone. */
struct timer_list
{
struct timer_list *next, **prev; /* things like to test "T->prev != NULL" */
long long expires;
/* The function to be called when the timer expires. If the
function returns a non-zero value, the timer is put back on the
list. */
int (*fnc) (void *);
void *fnc_data;
};
/* Initialize the timer TIMER. */
void timer_clear (struct timer_list *timer);
/* Add the timer TIMER to the list. */
void timer_add (struct timer_list *timer);
/* Remove the timer TIMER from the list. */
int timer_remove (struct timer_list *timer);
/* Change the expiration time of the timer TIMER to EXPIRES. */
void timer_change (struct timer_list *timer, long long expires);
static inline long long
fetch_jiffies ()
{
extern volatile struct mapped_time_value *timer_mapped_time;
extern long long timer_root_jiffies;
struct timeval tv;
long long j;
maptime_read (timer_mapped_time, &tv);
#define HZ 100
j = (long long) tv.tv_sec * HZ + ((long long) tv.tv_usec * HZ) / 1000000;
return j - timer_root_jiffies;
}
#endif /* _TIMER_H_ */
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