developing a real time device driver

I am developing a real time device driver for a Data Acquisition Card. How do I do real time programming?

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...on card. When the data is ready, the card will generate an interrupt request, which will be responded by the driver.
<br>2. When developing the interrupt-process-program, make sure you write it in a good manner, which means keeping this processing as short as possible. In this way, you can ensure the 'real-time' requirement.
<br>3. Also ...