Wolfgang Grandegger wrote:
> Gilles Chanteperdrix wrote:
> > On Dec 11, 2007 2:20 PM, Wolfgang Grandegger <[EMAIL PROTECTED]> wrote:
> >> Wolfgang Grandegger wrote:
> >>> The attached test application using a more sophisticated signal handling
> >>> works fine on my MPC5200-board running Linux 2.6.23 and Xenomai trunk.
> >>> Going to try it tomorrow on my PC.
> >> It works fine as well on my PC with Linux 2.6.23 and Xenomai trunk and
> >> now also with Linux 2.4.25 and Xenomai 2.3.x :-). Just to understand it
> >> right: The task signaled with pthread_kill() will be suspended and
> >> switches to secondary mode if it was running in primary mode. The signal
> >> will then be handled by Linux as usual. When the task resumes, does it
> >> get switched back to primary mode automatically?
> >
> > No, it will get swtiched back to primary mode only if it calls a
> > service needing primary mode.
>
> OK.
>
> >> Great, the only open issue is why executing init_task() switches to
> >> secondary mode resulting in period overruns in high_prio_task(). Is that
> >> obvious to you?
> >
> > init_task calls pthread_create, which needs running in secondary mode
> > to create a thread. We can not create a task without help from
> > secondary mode.
>
> OK.
>
> I was a bit quick with my assumption that it works with 2.4. It actually
> only works, if I have a pthread_set_mode_np() in the while loop of the
> primary task:
>
> while (1) {
> pthread_set_mode_np(0, PTHREAD_PRIMARY);
> count++;
> }
>
> Without pthread_set_mode_np(), the system hangs after the following
> output lines:
>
> bash-2.05b# ./kill_pthread2
> Starting high_prio_task
> low_prio_task: policy=1 prio=5
> SIGUSER1 to id_low: count=17497245, overruns=0
>
> It seems to hang when the low_prio_task() calls pthread_wait_np()
> thereafter. Any quick idea where the problem is?
I am clueless. Are you sure you recompiled the kernel after applying the
patch adding the pthread_kill syscall ?
--
Gilles Chanteperdrix.
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