Actually, the system does not spin when you call usleep, clock_nanosleep
or nanosleep functions from an rt-thread. The thread is blocked just like with
pthread_wait_np. In fact, use of these functions is preferred to
pthread_wait_np since they are standard in POSIX.
Michael.
karl rentsch ([EMAIL PROTECTED]) wrote:
>
> Thanks everyone, but I've got it sorted out now. I upgraded from the
> development RT-Linux (3.0 pre ?) to the latest 3.0 kernal and it seems
> to have solved the problem of the one-shot pthread_make_periodic
> function not resetting (I can't remeber changing anything else). Here's
> the code for interest:
>
> void *can_update(void *pparams)
> {
> volatile sched_can_msg_t *msg;
> can_output_t can_output_data;
> hrtime_t time, sched_time;
> int i = 0;
>
> while(1) {
> msg = can_objects->can_messages;
> time = gethrtime();
> sched_time = time + 10000000LL;
>
> for(i = 0; i < can_objects->no_entries; i++) {
> if(msg->id >= 0) {
> if(time > (msg->last_sent +
> msg->period)) {
> can_output_data.msg.port = msg->channel;
> can_output_data.msg.id = msg->id;
> can_output_data.msg.datalen =
> msg->datalen;
>
> memcpy(&can_output_data.msg.data, &msg->data,
> sizeof(can_output_data.msg.data));
> rtf_put(CAN_DRV_TX_FIFO,
> &can_output_data, sizeof(can_output_t));
> msg->last_sent = gethrtime();
>
> }
> if(sched_time > (msg->last_sent +
> msg->period)) {
> sched_time = msg->last_sent +
> msg->period;
> }
> }
> msg++;
> }
> pthread_make_periodic_np(pthread_self(), sched_time, 0);
> pthread_wait_np();
> }
> return 0;
> }
>
> Regards
>
> Karl Rentsch
>
>
> > karl rentsch wrote:
> >
> > Hi all,
> >
> > I've got a problem I hope someone can help me with. I'm trying to put
> a
> > thread to sleep but I don't want to tie up the system using usleep()
> or
> > nanosleep(). I've tried using pthread_make_periodic_np configured as
> a
> > one shot timer (ie. it needs to repeat several times but for different
> > time intervals) but it doesn't seem to work
> > Any help would be much appreciated
> > Thanks
> > Karl Rentsch
>
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