/* clkhandler.c - clkhandler */

#include 

/*------------------------------------------------------------------------
 * clkhandler - high level clock interrupt handler
 *------------------------------------------------------------------------
 */
void    clkhandler()
{
        static  uint32  count1000 = 1000;       /* Count to 1000 ms     */

        /* Decrement the ms counter, and see if a second has passed */

        if((--count1000) <= 0) {

                /* One second has passed, so increment seconds count */

                clktime++;

                /* Reset the local ms counter for the next second */

                count1000 = 1000;
        }

        /* Handle sleeping processes if any exist */

        if(!isempty(sleepq)) {

                /* Decrement the delay for the first process on the     */
                /*   sleep queue, and awaken if the count reaches zero  */

                if((--queuetab[firstid(sleepq)].qkey) <= 0) {
                        wakeup();
                }
        }

        /* Decrement the preemption counter, and reschedule when the */
        /*   remaining time reaches zero                             */

        if((--preempt) <= 0) {
                preempt = QUANTUM;
                resched();
        }
}