If a process in the Waiting state is waiting for multiple I/O events simultaneously, how does the five-state model handle this scenario, and what is a key limitation of the model in this context?
hard🎤 Interviewer Follow-up Q15 of Q15
Operating Systems - Process State Machine - Five-State Model
If a process in the Waiting state is waiting for multiple I/O events simultaneously, how does the five-state model handle this scenario, and what is a key limitation of the model in this context?
AThe process moves to Ready state after the first I/O event completes, ignoring others, which can cause errors
BThe process remains in Waiting until all I/O events complete; the model does not distinguish multiple waits, limiting concurrency handling
CThe process splits into multiple processes for each I/O event, which the model explicitly supports
DThe process moves to Running state and polls each I/O event, which the model assumes
Step-by-Step Solution
Step 1: Understand Waiting state semantics
Waiting means blocked until the awaited event(s) complete.
Step 2: Multiple I/O waits in five-state model
The model treats Waiting as a single state without differentiating multiple simultaneous waits.
Step 3: Limitation
This means the process stays in Waiting until all I/O events complete, limiting fine-grained concurrency.
Final Answer:
Option B -> Option B
Quick Check:
Five-state model does not handle multiple simultaneous waits distinctly [OK]
Quick Trick:Waiting state is a single block; multiple waits are not distinguished [OK]
Common Mistakes:
MISTAKES
Assuming process moves to Ready after any I/O completes
Believing process can split into multiple processes automatically
Thinking process polls I/O events while Running
Trap Explanation:
PITFALL
Option B is tempting but incorrect because the process cannot proceed until all waits complete. Option C is false; process splitting is not part of the model. Option D misrepresents the model's assumptions.
Interviewer Note:
CONTEXT
Tests deep understanding of model limitations and handling of complex waiting scenarios.
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