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TIMER.H
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1993-08-09
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2KB
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66 lines
#ifndef _TIMER_H
#define _TIMER_H
#ifndef _GLOBAL_H
#include "global.h"
#endif
/* Software timers
* There is one of these structures for each simulated timer.
* Whenever the timer is running, it is on a linked list
* pointed to by "Timers". The list is sorted in ascending order of
* expiration, with the first timer to expire at the head. This
* allows the timer process to avoid having to scan the entire list
* on every clock tick; once it finds an unexpired timer, it can
* stop searching.
*
* Stopping a timer or letting it expire causes it to be removed
* from the list. Starting a timer puts it on the list at the right
* place.
*/
typedef enum {
TIMER_STOP = 0,
TIMER_RUN = 1,
TIMER_EXPIRE = 2,
}Tistate;
struct timer {
struct timer *next; /* Linked-list pointer */
int32 duration; /* Period of counter (load value) */
int32 expiration; /* Ticks to go until expiration */
void (*func) __ARGS((void *)); /* Function to call at expiration */
void *arg; /* Arg to pass function */
Tistate state; /* Timer state */
#ifdef MDEBUG
char tname[9]; /* timer name DK5DC */
#endif
};
#define NULLTIMER (struct timer *)0
#define MAX_TIME (int32)4294967295L /* Max long integer */
#ifndef MSPTICK
#define MSPTICK 55 /* Milliseconds per tick */
#endif
/* Useful user macros that hide the timer structure internals */
#define dur_timer(t) ((t)->duration * MSPTICK)
#define run_timer(t) ((t)->state == TIMER_RUN)
extern int Tick;
extern void (*Cfunc[])();
/* In timer.c: */
void alarm __ARGS((int32 ms));
int pause __ARGS((int32 ms));
int32 read_timer __ARGS((struct timer *t));
void set_timer __ARGS((struct timer *t,int32 x));
void start_timer __ARGS((struct timer *t));
void stop_timer __ARGS((struct timer *timer));
char *tformat __ARGS((int32 t));
int32 msclock __ARGS((void));
int32 secclock __ARGS((void));
#endif /* _TIMER_H */