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GO Classes DPP | GATE CS | Operating System | Process State

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2 2 votes

Consider a single-CPU system with processes $A$, $B$, and $C$.

The following events have occurred:

  1. $A$ begins execution.
     
  2. $A$ creates $B$, and $B$ is scheduled.
     
  3. The running process requests disk I/O.
     
  4. The running process creates $C$, but $C$ is not yet scheduled.
     
  5. The time slice of the running process expires, and $C$ is scheduled.
     

Immediately after Step $5$, what are the states of $A$, $B$, and $C$ respectively?

  1. $A:$ RUNNING, $B:$ BLOCKED, $C:$ READY
     
  2. $A:$ READY, $B:$ BLOCKED, $C:$ RUNNING
     
  3. $A:$ BLOCKED, $B:$ READY, $C:$ RUNNING
     
  4. $A:$ READY, $B:$ RUNNING, $C:$ BLOCKED

1 Answer

2 2 votes

At Step $2$, $B$ is scheduled while $A$ becomes ready.

$B$ subsequently issues the disk I/O request, so $B$ becomes BLOCKED.

$A$ resumes execution and creates $C$. $C$ initially enters the ready state.

When $A$'s time slice expires and $C$ is scheduled:

  • $A$ becomes READY
     
  • $B$ remains BLOCKED, since its I/O has not yet completed
     
  • $C$ becomes RUNNING
     

Answer : B

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