/* clock.c: */
* IBM PC Clock tick functions */
#include <dos.h>
/* Pointer to the clock tick */
static volatile unsigned long far
*tptr= MK_FP(0,0x46c);
static unsigned long start = 0L;
/* clock_reset: Resets the timer */
void clock_reset(void)
{
start = *tptr;
}
/* clock_wait: */
* Waits a certain number of ticks */
void clock_wait(unsigned long n)
{
start = *tptr;
while ((*tptr - start) < n)
;
}
/* clock_elapsed: Returns the */
* number of ticks since last reset */
unsigned long clock_elapsed(void)
{
return *tptr - start;
}
/* End of File */