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On 4/26/2012 2:32 PM, Jan de Kruyf wrote:
> I was going to bring that issue up as well, that is indeed my
> understanding of preempt_rt, from reading the docs. I am not sure
> though that this has caused the mutex drama. That can only be if
> there is an unbalanced mutex or if the inheritance mechanism has
> not worked properly, or perhaps if some process had the lock and
> pagefaulted, and was not cleaned up properly, so the mutex still
> exists until reboot time.
> 
> I do not think there is an unbalanced mutex cause it works with
> rtai. That leaves the last 2 options. And caused by the new rtapi
> interface no doubt. So on my side some more understanding is needed
> now and I need to read up on the rtai interface again. The rest of
> the weekend is more or less available but it is a lot of work for
> me.
> 
> But I think you got a long way already. Not half as bad as the
> prognosis this morning.

Looks like the last option.

If you follow the child with the debugger, the rtapi_app crashes when
loading the initial tasks (the first line of lat.hal: loadrt threads ..)

The first task seems to get created OK, but the second causes a
segfault (line 121, the call to hal_create_thread).

I'm not yet sure why...

- -- 
Charles Steinkuehler
char...@steinkuehler.net
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