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timer.h
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C/C++ Source or Header
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1994-09-16
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3KB
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85 lines
/****************************************************************************
* timer.h *
* $Id: timer.h 1.2 93/07/16 11:51:38 ROOT_DOS Exp $
* 04 Jul 93 1.2 GT Fix warnings. *
*
* ATARI Version by David Nash - dnash@chaos.demon.co.uk
*
* Adjust MSPTICK and add extern int to Tick, Cfunct
* pause -> Pause to prevent conflict with Lattice C V5.6
*
****************************************************************************/
#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.
*/
struct timer {
struct timer *next; /* Linked-list pointer */
int32 duration; /* Duration of timer, in ticks */
int32 expiration; /* Clock time at expiration */
void (*func) __ARGS((void *)); /* Function to call at expiration */
void *arg; /* Arg to pass function */
char state; /* Timer state */
#define TIMER_STOP 0
#define TIMER_RUN 1
#define TIMER_EXPIRE 2
};
#define NULLTIMER (struct timer *)0
#define MAX_TIME (int32)4294967295 /* Max long integer */
#ifndef MSPTICK
#ifndef ATARI
#define MSPTICK 55 /* Milliseconds per tick */
#else
#define MSPTICK 20 /* Milliseconds per tick */
#endif
#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)
#ifndef ATARI
extern int Tick;
extern void (*Cfunc[]) __ARGS((void)); /* List of clock tick functions */
#else
volatile extern int Tick;
extern void (*Cfunc[]) (void); /* List of clock tick functions */
#endif
/* In timer.c: */
void alarm __ARGS((int32 ms));
#ifndef ATARI
int pause __ARGS((int32 ms));
#else
int Pause __ARGS((int32 ms));
#endif
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));
/* In hardware.c: */
int32 msclock __ARGS((void));
int32 secclock __ARGS((void));
#endif /* _TIMER_H */