Re: [Xenomai-help] Posix skin illegal seek on sem_wait

[Daniel Simon <Daniel.Simon@domain.hid>]

On Tue, 25 Apr 2006 15:44:02 +0200
Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> 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?

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?

>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)

>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?

	Thanks

		Daniel