BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom [Stefano Miotto <miotto@control.dsi.unifi.it>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Thu May 24 03:38:20 2001
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Date: Thu, 24 May 2001 11:33:13 +0200 (CEST)
From: Stefano Miotto <miotto@control.dsi.unifi.it>
cc: Realtime Linux <rtl@rtlinux.org>
Subject: Re: [rtl] thread scheduling and interrupts
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On Wed, 23 May 2001, Rini van Zetten wrote:

> Hi all,
>
> I' ve a problem regarding scheduling tasks. let me explain my software :
>
> If have one low priority task which consumes a large part of cpu time.
> If have one high priority task which is started by a interrupt routine and
> do a little processing.
> If have an interrupt routine which wakes up the high priority task.
>
> The problem is:
>
> When the interrupt occurs, the high priority task is fired. runs until it
> goes asleep again. after this the low priority task get running again (it
> was stopped by the interrupt) BUT the interrupt routine is not finished yet.
> After the low priority task falls asleep, and eventualy the interrupt
> routine ends.
>
> How can i let the interrupt routine ends immediately ???? (if the interrupt
> routine is not finished, new interrups are blocked);
>
> Rini

In my code I use rtl_hard_enable_irq(port_irq) to be sure a new interrupt
on that port will be handled even if the previous one is not finished yet.
Stefano.