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of an I/O operation.

At any instant, a process is in one and only one of the three states. For a single processor computer, only one process can be in the RUNNING state at any one instant. There can be many processes in the READY and BLOCKED states, and each of these states will have an associated queue for processes.

Processes entering the system must go initially into the READY state, and processes can only enter the RUNNING state via the READY state. Processes normally leave the system from the RUNNING state. For each of the

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