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There are three processes in the ready queue. When the currently running process requests for I/O how many process switches take place?
- a)1
- b)2
- c)3
- d)4
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
There are three processes in the ready queue. When the currently runni...
Single process switch will take place as when the currently running process requests for I/O, it would be placed in the blocked list and the first process residing inside the Ready Queue will be placed in the Running list to start its execution. Option (A) is correct.
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There are three processes in the ready queue. When the currently runni...
Explanation:
When a process requests for I/O, it goes from running state to blocked state. The CPU scheduler then selects another process from the ready queue to run on the CPU. This process switch takes place only once as explained below:
- Initially, all three processes are in the ready queue.
- The first process is selected and starts running on the CPU.
- When the first process requests for I/O, it goes from running state to blocked state.
- The CPU scheduler selects the second process from the ready queue to run on the CPU.
- Since there are only three processes in the ready queue, the second process runs to completion without any interruption.
- When the second process completes, the third process is selected to run on the CPU.
- Again, since there are only three processes in the ready queue, the third process runs to completion without any interruption.
- The first process remains blocked until the I/O operation is completed, after which it goes back to the ready queue.
Therefore, there is only one process switch that takes place when the currently running process requests for I/O.
Hence, the correct answer is option 'A'.
When a process requests for I/O, it goes from running state to blocked state. The CPU scheduler then selects another process from the ready queue to run on the CPU. This process switch takes place only once as explained below:
- Initially, all three processes are in the ready queue.
- The first process is selected and starts running on the CPU.
- When the first process requests for I/O, it goes from running state to blocked state.
- The CPU scheduler selects the second process from the ready queue to run on the CPU.
- Since there are only three processes in the ready queue, the second process runs to completion without any interruption.
- When the second process completes, the third process is selected to run on the CPU.
- Again, since there are only three processes in the ready queue, the third process runs to completion without any interruption.
- The first process remains blocked until the I/O operation is completed, after which it goes back to the ready queue.
Therefore, there is only one process switch that takes place when the currently running process requests for I/O.
Hence, the correct answer is option 'A'.
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