Which of the following process state transitions is/are NOT possible?
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Answer: B;C
In a standard operating system process state transition model (5-state model), the valid states are New, Ready, Running, Waiting (Blocked), and Terminated.
Let us analyze each transition option:
- A. Running to Ready: Possible. This happens when a running process is preempted (e.g., due to a time-slice expiration in Round Robin scheduling or a higher-priority process arriving).
- B. Waiting to Running: NOT possible. A process in the Waiting state must first move to the Ready state once its I/O or event completes. It can only transition to the Running state when selected by the CPU scheduler from the Ready queue.
- C. Ready to Waiting: NOT possible. A process can only request an I/O operation or wait for an event while it is actively executing in the Running state. A process waiting in the Ready queue cannot initiate an I/O request.
- D. Running to Terminated: Possible. This occurs when a process finishes its execution normally or is terminated due to an error.
Since the question asks for transitions that are NOT possible, the correct options are B and C.
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