Polling for an I/O completion can waste a large number of CPU cycles if the processor iterates a busy-waiting loop many times before the I/O completes. But if the I/O device is ready for service, polling can be much more efficient than is catching and dispatching an interrupt. Describe a hybrid strategy that combines polling, sleeping and interrupts for I/O service. For each of these strategies (pure polling, pure interrupts, hybrid) describe a computing environment in which that strategy is more efficient than is either of the others.

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