From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <44B341E2.9040506@domain.hid>
Date: Tue, 11 Jul 2006 08:14:58 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-help] Sychronize between Linux and Xenomai domain
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To: "Li Yi (Adam)" <liyiadam@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

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Li Yi (Adam) wrote:
> Hi Jan,
>=20
> Sometimes there is situation to  protect a  Non-real time task in kerne=
l
> space NOT to be interrupted by Xenomai task.
> Is disabling HW interrupt the only way? Can I stall Xenomai Domain from=


Think of SMP as well (ok, blackfin is UP so far, right? :)): you need
IRQ lock + some spinlock that is acquired in the IRQ handler(s) as well,
thus you end up with that rtdm_lock_t again.

> handling interrupt while let the Linux domain
> handle interrupt normally?

Stalling (i.e. preventing IRQ delivery) higher prio domains (like
Xenomai) implicitly means stalling all lower prio ones (including
Linux): No, this is not possible. You might prevent rescheduling by
setting the scheduler lock of Xenomai, but this still doesn't protect
from IRQs.

Jan


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