Operating Systems - Process State Machine - Five-State Model
Trace the sequence of state transitions for a process that requests I/O while running and then completes the I/O operation. What is the correct order of states the process goes through?
Trace the sequence of state transitions for a process that requests I/O while running and then completes the I/O operation. What is the correct order of states the process goes through?
easy🧠🧾 Concept Trace Q12 of Q15
Step-by-Step Solution
Step 1: Identify the event
The process requests I/O while Running, so it must wait for I/O completion.Step 2: State transition on I/O request
Process moves from Running to Waiting state to wait for I/O.Step 3: After I/O completes
Process moves from Waiting to Ready state, waiting for CPU scheduling.Step 4: CPU scheduling
Process moves from Ready to Running when CPU is allocated.Final Answer:
Option A -> Option AQuick Check:
Running -> Waiting (I/O request), Waiting -> Ready (I/O done), Ready -> Running (CPU assigned) [OK]
Quick Trick: I/O request moves process Running -> Waiting, then Waiting -> Ready after I/O completes [OK]
Common Mistakes:
MISTAKES- Confusing Ready and Waiting states order
- Assuming process goes directly from Waiting to Running
- Skipping the Ready state after I/O completion
Trap Explanation:
PITFALL- Options A and D incorrectly place Ready before Waiting or skip Waiting entirely. Option C incorrectly places Running between Waiting and Ready, which is not possible without CPU scheduling.
Interviewer Note:
CONTEXT- Tests candidate's ability to mentally trace process state transitions triggered by I/O events.
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