Operating Systems - Process State Machine - Five-State Model
A process is currently in the Running state and issues an I/O request. Describe the sequence of state transitions that follow until the process resumes execution.
A process is currently in the Running state and issues an I/O request. Describe the sequence of state transitions that follow until the process resumes execution.
easy🧠🧾 Concept Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace transitions after I/O request
When a process issues I/O, it moves from Running to Waiting to wait for I/O completion.Step 2: After I/O completes
The process moves from Waiting to Ready, waiting to be scheduled again.Step 3: Scheduler dispatches process
Finally, the process moves from Ready to Running.Final Answer:
Option D -> Option DQuick Check:
Running->Waiting->Ready->Running matches I/O wait cycle [OK]
Quick Trick: I/O request triggers Running->Waiting, then Ready->Running [OK]
Common Mistakes:
MISTAKES- Swapping Ready and Waiting states
- Including Terminated incorrectly
- Assuming immediate Ready after Running
Trap Explanation:
PITFALL- Candidates confuse the order of Waiting and Ready states after I/O request.
Interviewer Note:
CONTEXT- Tests understanding of process lifecycle during I/O operations.
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