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List:       linux-audio-dev
Subject:    Re: [linux-audio-dev] Watchdogs?
From:       David Olofson <david () gardena ! net>
Date:       2002-03-24 17:55:46
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On Tuesday 19 March 2002 19.03, Paul Davis wrote:
[...]
> this idea has been discussed here quite a bit. however, its much,
> much harder to do this *between* different processes. again, there
> is no way to tell that a SCHED_FIFO thread has gone wrong from "its
> just very busy", and you can't even really identify either of these
> conditions.

In the case of real time applications, I'd say it's rather easy: If a 
thread is frequently missing deadlines, while burning all CPU time it 
gets, something is wrong.

Now, there's still this creepy situation where the real time threads 
actually *meet* their deadlines - while leaving no CPU time to other 
processes. *heh*

How about bouncing a message of some sort to a lowest priority 
SCHED_FIFO thread, and check that it actually responds?


//David

.- M A I A -------------------------------------------------.
|      Multimedia Application Integration Architecture      |
| A Free/Open Source Plugin API for Professional Multimedia |
`----------------------> http://www.linuxaudiodev.com/maia -'
.- David Olofson -------------------------------------------.
| Audio Hacker - Open Source Advocate - Singer - Songwriter |
`-------------------------------------> http://olofson.net -'

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