From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon, 1 Dec 2014 08:31:30 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Message-ID: <20141201073130.GQ2964@hermes>
References: <5389961F-2DC1-43AA-8FEA-2BD0D3A61B7E@gmail.com>
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Subject: Re: [Xenomai] Performance monitoring question
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To: Mathew Benson <mathew.benson@gmail.com>
Cc: xenomai@xenomai.org

On Sun, Nov 30, 2014 at 10:39:56PM -0600, Mathew Benson wrote:
> I'm using the native skin. I understand there are things you can
> do to cause a user space task to fall back to the normal Linux
> scheduler. How do I know if this has happened? Will RT functions
> like semaphores fail with an incorrect mode failure?

No, Xenomai automatically switches user-space tasks to primary or
secondary mode when needed.

> Can I register a callback to be notified?
> 
> I'm asking because I added code to my project fully expecting it
> to kick it back to normal scheduler or cause timers to fail, but
> nothing. Everything still seems to be working just fine.
> Specifically, I'm making ioctl calls to access a webcam. So what
> can I do to verify that my tasks really are running on the rt
> scheduler?

See:
http://xenomai.org/2014/06/finding-spurious-relaxes/

-- 
					    Gilles.