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ISRO CSE 2009 | Question: 9

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7 7 votes

Which is the correct definition of a valid process transition in an operating system?

  1. Wake up: ready $\rightarrow$ running
  2. Dispatch: ready $\rightarrow$ running
  3. Block: ready $\rightarrow$ running
  4. Timer runout: $\rightarrow$ ready $\rightarrow$ running

3 Answers

Best answer
13 13 votes
Answer is [B]

a) WakeUp : waiting->ready

b) Dispatch : Ready-> Running

c) Block : Waiting/Blocked ->Ready

d) Timerout : Running->Blocked
• selected by
0 0 votes
1. wake up means hey your i/0 request approved and again go for the executing so we put from blocked to ready
2.dispatch:scheduler dispatch from ready to running state
3.block: from running u have an i/o request so lead to block(=waiting) state
4.timer runout:it an preemtive state from running state to go back to ready state
0 0 votes

Answer: Dispatch: ready → running

A process transition defines how a process changes its state in an operating system.

  • Dispatch is the operation performed by the CPU scheduler when it selects a process from the ready queue and assigns the CPU to it.

  • This causes the process state to change from Ready → Running.

Explanation of other options:

  • Wake up: transitions from Blocked → Ready (not Ready → Running).

  • Block: transitions from Running → Blocked (when waiting for I/O).

  • Timer runout: transitions from Running → Ready (when time slice expires).

Correct transition:
Dispatch: Ready → Running

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