[Solved] In a system where processes can wait for multiple I/O events simultaneously, which approach better handles the Waiting to Ready transition in the five-state model, and why? | Operating Systems

Operating Systems - Process State Machine - Five-State Model

In a system where processes can wait for multiple I/O events simultaneously, which approach better handles the Waiting to Ready transition in the five-state model, and why?

AImmediately transition to Ready upon the first I/O event completion, ignoring others.

BCreate multiple Waiting states, one per I/O event, and transition to Ready when any one event completes.

CUse a single Waiting state with a counter for pending I/O events, transitioning to Ready only when the counter reaches zero.

DSkip the Waiting state entirely and keep the process in Ready until all I/O events complete.

Step-by-Step Solution

Solution:

Step 1: Analyze multi-I/O wait handling
Processes waiting on multiple I/O events must wait for all to complete before Ready.
Step 2: Single Waiting state with counter
Maintaining a counter of pending events ensures correct transition timing.
Step 3: Multiple Waiting states or premature Ready transitions are incorrect
Multiple Waiting states complicate management; transitioning on first event breaks correctness.
Step 4: Skipping Waiting state loses synchronization semantics
Process must not be Ready until all I/O complete.
Final Answer:
Option C -> Option C
Quick Check:
Counter-based Waiting state ensures all I/O complete before Ready [OK]

Quick Trick: Wait for all I/O events before Ready using a counter [OK]

Common Mistakes:

MISTAKES

Transitioning on first I/O completion
Using multiple Waiting states per event
Ignoring Waiting state for synchronization

Trap Explanation:

PITFALL

Candidates often think any I/O completion suffices to move to Ready.

Interviewer Note:

CONTEXT

Evaluates handling of complex synchronization in process states.

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Solution Trace

More Operating Systems Quizzes

In a system where processes can wait for multiple I/O events simultaneously, which approach better handles the Waiting to Ready transition in the five-state model, and why?

Step 1: Analyze multi-I/O wait handling

Step 2: Single Waiting state with counter

Step 3: Multiple Waiting states or premature Ready transitions are incorrect

Step 4: Skipping Waiting state loses synchronization semantics

Final Answer:

Quick Check:

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