D a M i E n
The control program for a device-driver process is an infinite loop. Roughly, the loop body is: wait for I/O request from user process; send I/O command to device; wait for command completion; notify (unblock) user process. a) [10 marks] Suppose the device driver waits by polling the device for command completion. How does this affect multiprogramming? b) [10 marks] Assume there is a timer interrupt 60 times a second. Can you find a reasonable solution for waiting that does not use device interrupts? If you find one, describe it.
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