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Which trade-off is a key limitation of using a global waiter (arbitrator) to prevent deadlock in the Dining Philosophers problem?

medium🪤 Complexity Trap Q13 of Q15
Operating Systems - Dining Philosophers - Problem, Deadlock & Solution
Which trade-off is a key limitation of using a global waiter (arbitrator) to prevent deadlock in the Dining Philosophers problem?
AIt simplifies resource allocation but introduces a single point of failure and potential bottleneck
BIt increases concurrency but risks livelock under high contention
CIt eliminates deadlock but can cause starvation due to unfair scheduling
DIt guarantees fairness but requires complex priority inheritance mechanisms
Step-by-Step Solution

  1. Step 1: Understand the global waiter approach

    A global waiter serializes fork acquisition requests to prevent circular wait.

  2. Step 2: Analyze trade-offs

    This centralization simplifies deadlock prevention but creates a single point of failure and can bottleneck performance.

  3. Step 3: Evaluate other options

    It increases concurrency but risks livelock under high contention is incorrect as concurrency is reduced; It eliminates deadlock but can cause starvation due to unfair scheduling is incorrect because starvation is not guaranteed; It guarantees fairness but requires complex priority inheritance mechanisms is incorrect as priority inheritance is unrelated here.

  4. Final Answer:

    Option A -> Option A

  5. Quick Check:

    Centralized control trades deadlock prevention for potential bottleneck and failure risk.
Quick Trick: Global waiter = deadlock-free but centralized bottleneck [OK]
Common Mistakes:
MISTAKES
  • Confusing starvation with deadlock prevention
  • Assuming increased concurrency with global waiter
  • Misattributing priority inheritance to this solution
Trap Explanation:
PITFALL
  • Options B and C confuse starvation and concurrency effects; Option D incorrectly associates priority inheritance with the global waiter approach.
Interviewer Note:
CONTEXT
  • Tests understanding of trade-offs and limitations of centralized deadlock prevention strategies.
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