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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 _KERN_TIME_OUT_H_
#define _KERN_TIME_OUT_H_
/*
* Mach time-out and time-of-day facility.
*/
#include <mach/boolean.h>
#include <mach/time_value.h>
#include <kern/lock.h>
#include <kern/queue.h>
#include <kern/zalloc.h>
/*
* Timers in kernel:
*/
extern unsigned long elapsed_ticks; /* number of ticks elapsed since bootup */
extern int hz; /* number of ticks per second */
extern int tick; /* number of usec per tick */
/* Read the current time into STAMP */
void record_time_stamp (time_value_t *stamp);
/*
* Time-out element.
*/
struct timer_elt {
queue_chain_t chain; /* chain in order of expiration */
int (*fcn)(); /* function to call */
char * param; /* with this parameter */
unsigned long ticks; /* expiration time, in ticks */
int set; /* unset | set | allocated */
};
#define TELT_UNSET 0 /* timer not set */
#define TELT_SET 1 /* timer set */
#define TELT_ALLOC 2 /* timer allocated from pool */
typedef struct timer_elt timer_elt_data_t;
typedef struct timer_elt *timer_elt_t;
/* for 'private' timer elements */
extern void set_timeout();
extern boolean_t reset_timeout();
/* for public timer elements */
extern void timeout();
extern boolean_t untimeout();
#define set_timeout_setup(telt,fcn,param,interval) \
((telt)->fcn = (fcn), \
(telt)->param = (param), \
(telt)->private = TRUE, \
set_timeout((telt), (interval)))
#define reset_timeout_check(t) \
MACRO_BEGIN \
if ((t)->set) \
reset_timeout((t)); \
MACRO_END
#endif /* _KERN_TIME_OUT_H_ */
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