BOUNCE rtl@rtlinux.org: Approval required: (fwd)

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

>From owner-rtl Wed May  9 06:27:20 2001
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Date: Wed, 9 May 2001 06:20:23 -0600
From: Victor Yodaiken <yodaiken@fsmlabs.com>
To: rtl@fsmlabs.com
Cc: rtl@rtlinux.org
Subject: Re: [rtl] Nanosleep and priority
Message-ID: <20010509062023.A10023@hq2>
References: <3AF9123A.F7EA2DE1@b2i-toulouse.com>
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In-Reply-To: <3AF9123A.F7EA2DE1@b2i-toulouse.com>; from sgaume@b2i-toulouse.com on Wed, May 09, 2001 at 11:47:38AM +0200
Organization: FSM Labs


Are you sure that the first task is still running?

On Wed, May 09, 2001 at 11:47:38AM +0200, S?bastien GAUME wrote:
> Hello !
> 
> I've come across surprising results while using the nanosleep function
> in my realtime tasks. I wrote a program in which two tasks are created.
> Both are periodic (running under the oneshot mode, period = 5 ms), are
> supposed to start at the same time and should last 2 ms. One has a
> greater priority level then the other. And I'm aiming to check if the
> realtime scheduling works well.
> 
> What  really surprises me is that the task with the lower priority level
> 
> always starts about 20 us after the first task ! At that moment, this
> task is not supposed being able to wake up and to start...
> 
> I  feel the impression that the realtime tasks behave as if there is no
> realtime scheduling, although the fifo realtime scheduling should be on
> and work.
> 
> So, I you have any idea of what the problem could be,...
> 
> Thank you
> 
> Sebastien
> 
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