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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?

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? Correct Answer I, II, and IV only

A process state diagram for a pre-emptive scheduling is:

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Statement I: TRUE

A process can move from running state to ready state on interrupt or when priority expires, that is, when it is pre-empted.

Statement II: TRUE

A ready process moves to running process when it is dispatched.

Statement III: FALSE

A blocked process that is in waiting state can never move directly to running state. It must go to ready queue first.

Statement IV: TRUE.

A blocked or waiting process can move to ready state.

Important Point:

The transition from running to ready state is possible only in pre-emptive scheduling. It cannot happen in non pre-emptive scheduling.

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