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Interrupt mechanism temporarily by your processor to handle a I / device O. When the interrupt occurs, the hardware will be stored in the calculation of the state, the calculation is used to restart the interrupt processing interrupt. Time interrupt time occurred without warning, but the polling can determine the exact time is necessary, a system speed, depending on the speed of the device using polling / O, my conclusion is that a computer, using large programs are easy to interrupt I / O and provide better performance. The use of a computer polling coal.
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