On 09/14/2010 05:44 AM, Robert Schwebel wrote:
On Tue, Sep 14, 2010 at 11:24:21AM +0200, Raz wrote:
anyone can say preempt rt is hard real time?
Hard realtime has something to do with how you define "missing the
deadline". If somebody cuts the cable of your roboter controller in the
factory hall, the system misses the deadline. So it is all about
probabilities: hard realtime systems have a very, very low probability
of missing the deadline. However, in real life systems, it is> 0%.
So yes, if you talk about real world, it is hard realtime.
No. Preempt rt it's not hard realtime.
But most people/companies who think they need hard realtime really
don't. They can live with soft realtime and have a really low
probability of missing deadlines and having long latencies. For these
people, the preempt rt is adequate.
--
Jeff Angielski
The PTR Group
www.theptrgroup.com
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