Subject:
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Re: RCX and Java
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 5 May 1999 09:58:21 GMT
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Viewed:
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1183 times
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In lugnet.robotics, lego-robotics@crynwr.com (Ola Liljedahl) writes:
> Aren't robots real time systems?
> Isn't the RCX meant to be a component in such real time systems?
>
> Java (as implemented by current virtual machines) is NOT suitable
> as a platform for building real time systems. The implementation of
> garbage collection is not deterministic and may take a very long
> time to execute. You Emacs users out there should recognise the problem...
>
> We should make the distinction between real time systems and embedded
> systems. Java is fine for embedded systems with no real time requirements.
>
> In my line of business I see some Java being used in real time systems.
> But never for real time purposes, only for low priority (as regards to
> real time properties) operation and maintenance.
FYI I have been involved in two (big) projects using java for controlling
industrial production one is used to control high speed sorting systems the
other for controlling packing of newspapers comming directly from the rotation
press. And yes it works. Offcourse you cannot give any guarantess.
> --
> Ola Liljedahl
> olli@enea.se
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: RCX and Java
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| (...) When making a GSM call setup the latency for the call going into a base station/base station controller and out into the next in the chain is 20ms. If you fail you break the GSM specification. How are you going to guarantee that with Java? (...) (25 years ago, 5-May-99, to lugnet.robotics)
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Message is in Reply To:
| | RCX and Java
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| Aren't robots real time systems? Isn't the RCX meant to be a component in such real time systems? Java (as implemented by current virtual machines) is NOT suitable as a platform for building real time systems. The implementation of garbage (...) (25 years ago, 4-May-99, to lugnet.robotics)
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