Hi Philippe,
It is an mmap-ed I/O memory.
Regards
Bharath
On Wed, Aug 25, 2010 at 11:53 AM, Philippe Gerum <r...@xenomai.org> wrote:
> On Wed, 2010-08-25 at 11:12 +0200, Bharath Achuta Bhat wrote:
> > Hello Xenomai experts,
> >
> >
> > I am running a xenomai-2.5.1 patched kernel (v 2.6.30.3) with ipipe
> > version 2.7-06.
> > The target is powerpc (MPC8533E).
> > My application is switching to the secondary mode (I guess because of
> > a page-fault) when ntohl() is called.
> > This is a libc function and I am wondering why only this function
> > (ntohl()) is causing a page-fault.
>
> What memory are you reading from / writing to in the statement involving
> ntohl()? Is this plain RAM, or mapped I/O memory?
>
> >
> >
> > Here is how the application looks like
> >
> >
> > main ()
> > {
> > ...
> > ...
> > /* Avoids memory swapping for this program */
> > mlockall(MCL_CURRENT | MCL_FUTURE);
> >
> >
> > ......
> > ......
> > /* signal handlers */
> > .....
> > .....
> > /* create communication pipes */
> > rt_pipe_create(&tPipe1, .....
> > rt_pipe_create(&tPipe2,.......
> >
> >
> > /* create RT tasks */
> > rt_task_create(&tTask1,.....
> > rt_task_create(&tTask2,......
> > ...........
> > ..........
> >
> >
> > /* start the RT tasks */
> > rt_task_start(&tTask1,.....
> > ..............
> > ..............
> >
> >
> > /* turn the current thread into RT function */
> > ret = rt_task_shadow(NULL, "RT main function", 1, T_SUSP);
> >
> >
> > ....
> > ....
> >
> >
> > }
> >
> >
> > One of the rt tasks created calls ntohl() and switches to secondary
> > mode.
> > Is there a way to avoid it ?
> >
> >
> > --
> > Thanks and regards
> > Bharath
> >
> > _______________________________________________
> > Xenomai-help mailing list
> > Xenomai-help@gna.org
> > https://mail.gna.org/listinfo/xenomai-help
>
> --
> Philippe.
>
>
>
--
Thanks and regards
Bharath
_______________________________________________
Xenomai-help mailing list
Xenomai-help@gna.org
https://mail.gna.org/listinfo/xenomai-help
