Daniel Simon wrote:
> On Tue, 25 Apr 2006 15:44:02 +0200
> Gilles Chanteperdrix <[EMAIL PROTECTED]> wrote:
>
> > The term "Xenomai thread" comes from the document "Life with Adeos":
>
> The shadowing process is not clear in this paper, e.g. bottom of page 6:
>
> <<Xenomai allows to run real-time threads either strictly in kernel
> space, or within the address space of a Linux process. In the rest of
> this article, we will refer to the latter as the Xenomai threads, not
> to be confused with regular Linux tasks (even when they belong to the
> SCHED_FIFO class).>>
>
> I guess that "regular Linux tasks unknown to Xenomai, and which
> only happen to belong to the SCHED_FIFO class" are those compiled and
> linked against the regular pthread library?
The difference between regular threads and Xenomai threads is rather a
run-time issue than a link-time issue. If Xenomai POSIX skin
pthread_create and pthread_setschedparam services are called with
incorrect arguments (not SCHED_FIFO), they fall back to the services of
the regular posix threading library.
>
> Anyway, my threads are created with the SCHED_FIFO flag; may be there
> is a conflict with main() which, as I understand, can be only a regular
> thread?
Real-time shadows are listed in /proc/xenomai/sched; do you see them
there ? You may use pthread_set_name_np to set their name.
>
> >signals sent by the timer_* services will
> >cause migration of the target thread to secondary mode
>
> I notice that timer_settime(...) also returns an error (perror
> says "Operation not permitted" while errno is set to 29 "illegal
> seek", as for the sem_wait)
As documented, if the caller context is invalid, the error should be
EPERM (Operation not permitted), not ESPIPE (illegal seek). Anyway, I am
trying to run your program here to see what is wrong.
>
> >signals [...] cause migration of the target thread to secondary mode
>
> is it only a "not yet implemented" feature or is it a basic
> conflict between signals and hard real-time?
It is not yet implemented.
--
Gilles Chanteperdrix.
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