pthread_t pp_thread;
// our periodic thread
void *pp_thread_ep(void *rate) { 
static int nState = 0;
// make this realtime thread periodic
pthread_make_periodic_np(pthread_self(),gethrtime(),FRAME_PERIOD_NS);
// this loop wakes up once per period
while (1) 
{
if (nState) outb(nStateý, LPT1_DATA); else outb(nState++,LPT1_DATA);
        // wait until next period of time
        pthread_wait_np();
    }
}

int init_module(void) {
    pthread_attr_t attrib; 
    struct sched_param sched_param; 
    // output string to /var/log/kern.log
    printk(ýinit_module pp_flip\ný);

    // prepare periodic thread for creation
    // initialize thread attributes
    sched_param.sched_priority = sched_get_priority_max(SCHED_FIFO);
    // obtain highest priority
    pthread_attr_init(&attrib);
    // set our priority
    pthread_attr_setschedparam(&attrib, &sched_param);    

    // and finally create the thread
    pthread_create(&pp_thread, &attrib, pp_thread_ep, (void *)0);
    return 0;
}

int cleanup_module(void) {

    printk(ýcleanup_module pp_flip\ný);
    pthread_delete_np(pp_thread);      // kill the thread
    return 0;
}