Bird
Raised Fist0

If the Dining Philosophers problem is extended to allow philosophers to pick up forks in any order but with a timeout mechanism to release held forks after waiting too long, what is a potential downside of this approach?

hard🎤 Interviewer Follow-up Q15 of Q15
Operating Systems - Dining Philosophers - Problem, Deadlock & Solution
If the Dining Philosophers problem is extended to allow philosophers to pick up forks in any order but with a timeout mechanism to release held forks after waiting too long, what is a potential downside of this approach?
AIt completely eliminates deadlock and starvation without any performance penalty
BIt may cause livelock where philosophers repeatedly pick up and release forks without eating
CIt guarantees fairness by enforcing strict turn-taking among philosophers
DIt simplifies synchronization by removing the need for semaphores or locks
Step-by-Step Solution

  1. Step 1: Understand timeout-based fork release

    Philosophers release forks if waiting too long, preventing indefinite blocking.

  2. Step 2: Analyze consequences

    This can cause livelock, where philosophers continuously pick up and release forks without making progress.

  3. Step 3: Evaluate other options

    It completely eliminates deadlock and starvation without any performance penalty is false because performance penalties and livelock can occur; It simplifies synchronization by removing the need for semaphores or locks is false as synchronization primitives are still needed; It guarantees fairness by enforcing strict turn-taking among philosophers is false as fairness is not guaranteed.

  4. Final Answer:

    Option B -> Option B

  5. Quick Check:

    Timeouts prevent deadlock but risk livelock due to repeated retries.
Quick Trick: Timeouts prevent deadlock but can cause livelock [OK]
Common Mistakes:
MISTAKES
  • Assuming timeouts solve all synchronization issues
  • Confusing livelock with deadlock
  • Believing fairness is guaranteed by timeouts
Trap Explanation:
PITFALL
  • Option D is correct because livelock is a known downside of timeout-based retry mechanisms; other options incorrectly assume perfect solutions or simplifications.
Interviewer Note:
CONTEXT
  • Tests advanced understanding of deadlock prevention trade-offs and the difference between deadlock and livelock.
Master "Dining Philosophers - Problem, Deadlock & Solution" in Operating Systems

2 interactive learning modes - each teaches the same concept differently

SolutionTrace

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Operating Systems Quizzes
Context Switch - Cost & Causes - Context Switch - Cost & Causes - Quiz 3easy Critical Section Problem - Requirements & Peterson's Solution - Critical Section Problem - Requirements & Peterson's Solution - Quiz 14medium Process State Machine - Five-State Model - Process State Machine - Five-State Model - Quiz 1easy Producer-Consumer Problem Using Semaphores - Producer-Consumer Problem Using Semaphores - Quiz 15hard Producer-Consumer Problem Using Semaphores - Producer-Consumer Problem Using Semaphores - Quiz 3easy Round Robin Scheduling - Quantum & Turnaround Time - Round Robin Scheduling - Quantum & Turnaround Time - Quiz 2easy Semaphore vs Mutex - When to Use Which - Semaphore vs Mutex - When to Use Which - Quiz 6medium Starvation vs Deadlock vs Livelock - Differences & Examples - Starvation vs Deadlock vs Livelock - Differences & Examples - Quiz 9hard System Call - Mechanism & Modes (User vs Kernel) - System Call - Mechanism & Modes (User vs Kernel) - Quiz 6medium TLB - Translation Lookaside Buffer & Effective Access Time - TLB - Translation Lookaside Buffer & Effective Access Time - Quiz 1easy