What Is A Real-time Operating System?

Is Windows a real-time system? If not, which system is real-time?

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.

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..

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.

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.