Gilles Chanteperdrix wrote:
> 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 ?
Well, I tried with v2.3.2, v2.3.x and also trunk, which does not require
the patch. Unfortunately, all versions show the same behavior.
Wolfgang.
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