Consider the following statements about process state transitions for a system…

2020

Consider the following statements about process state transitions for a system using preemptive scheduling.

I. A running process can move to ready state.

II. A ready process can move to running state.

III. A blocked process can move to running state.

IV. A blocked process can move to ready state.

Which of the above statements are TRUE ?

Answer: C. I, II, and IV only — Answer: The true transitions are: I (a running process can move to ready), II (a ready process can move to running), and IV (a blocked process can move to…

  1. A.

    I, II, and III only

  2. B.

    II and III only

  3. C.

    I, II, and IV only

  4. D.

    I, II, III and IV only

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Correct answer: C

Answer: The true transitions are: I (a running process can move to ready), II (a ready process can move to running), and IV (a blocked process can move to ready).

  • Running → Ready: True. In preemptive systems a running process may be preempted (for example by a timer interrupt or a higher-priority arrival) and placed back into the ready queue.

  • Ready → Running: True. The scheduler selects a ready process to run, so a ready process can move to running.

  • Blocked → Ready: True. When the event a process is waiting for occurs (e.g., I/O completion), the blocked process becomes ready.

  • Blocked → Running: False. A blocked process cannot go directly to running; it must first transition to ready and then be scheduled to run.

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