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SOURCE.ARC
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TIMER.C
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C/C++ Source or Header
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1990-06-11
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2KB
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88 lines
#include <stdio.h>
#include "global.h"
#include "timer.h"
/* Head of running timer chain */
struct timer *timers;
tick()
{
register struct timer *t,*tp;
register struct timer *expired = NULLTIMER;
/*char i_state;*/
/* Run through the list of running timers, decrementing each one.
* If one has expired, take it off the running list and put it
* on a singly linked list of expired timers
*/
/*i_state = disable();*/
for(t = timers;t != NULLTIMER; t = tp){
tp = t->next;
if(tp == t){
/*restore(i_state);*/
printf("PANIC: Timer loop at %lx\n",ptr2long(tp));
iostop();
exit(1);
}
if(t->state == TIMER_RUN && --(t->count) == 0){
stop_timer(t);
t->state = TIMER_EXPIRE;
/* Put on head of expired timer list */
t->next = expired;
expired = t;
}
}
/*restore(i_state);*/
/* Now go through the list of expired timers, removing each
* one and kicking the notify function, if there is one
*/
while((t = expired) != NULLTIMER){
expired = t->next;
if(t->func){
(*t->func)(t->arg);
}
}
}
/* Start a timer */
start_timer(t)
register struct timer *t;
{
/*char i_state;*/
if(t == NULLTIMER || t->start == 0)
return;
/*i_state = disable();*/
t->count = t->start;
if(t->state != TIMER_RUN){
t->state = TIMER_RUN;
/* Put on head of active timer list */
t->prev = NULLTIMER;
t->next = timers;
if(t->next != NULLTIMER)
t->next->prev = t;
timers = t;
}
/*restore(i_state);*/
}
/* Stop a timer */
stop_timer(t)
register struct timer *t;
{
/*char i_state;*/
if(t == NULLTIMER)
return;
/*i_state = disable();*/
if(t->state == TIMER_RUN){
/* Delete from active timer list */
if(timers == t)
timers = t->next;
if(t->next != NULLTIMER)
t->next->prev = t->prev;
if(t->prev != NULLTIMER)
t->prev->next = t->next;
}
t->state = TIMER_STOP;
/*restore(i_state);*/
}