Nov 22, 2009

What Is A Real-time Operating System?

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What Is A Real-time Operating System?

MASTA
Jul 19 2006, 10:58 AM
Is Windows a real-time system? If not, which system is real-time?

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yordan
Jul 19 2006, 08:56 PM
There are almost no more real-time operating systems.
Windows is not.
Some Unix systems had real-time extensions.
A real-time operating systems has to do some tasks immediately (stop the engine because of danger, immediately turn righwards because an obstacle in front, stop the laser beam because an alert signal arrived).
While a Windows or a Linux system is swapping, or when the cpu is 100% used because somebody is moving the mouse, no real-time action can take effect.

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miCRoSCoPiC^eaRthLinG
Jul 20 2006, 08:17 PM
Take a look at the following article. There's a long discussion on exactly the same topic posted by twitch quite sometime back:

What Is This Embedded And Realtime OS

That should explain the basic concepts to you..

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ignite
Nov 17 2006, 11:44 AM
QUOTE(yordan @ Jul 19 2006, 10:56 PM) *

There are almost no more real-time operating systems.
Windows is not.
Some Unix systems had real-time extensions.
A real-time operating systems has to do some tasks immediately (stop the engine because of danger, immediately turn righwards because an obstacle in front, stop the laser beam because an alert signal arrived).
While a Windows or a Linux system is swapping, or when the cpu is 100% used because somebody is moving the mouse, no real-time action can take effect.

This is common mistake. Real timeness is't about speed. But rather about predictivness. In realtime OS every operation and function operates in constant and predefined time. In common case realtime OSes slower then nonrealtime ones.

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bhatu
Jun 12 2007, 11:02 AM
QUOTE(MASTA @ Jul 19 2006, 04:28 PM) *
Is Windows a real-time system? If not, which system is real-time?



hi
exactly there windows is not real time,but "windows embedded CE" is an Real time.other example of Real Time are, nutos, rtos.

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What Is A Real-time Operating System?

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