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Given three processes P1, P2, and P3 where P1 holds resource R1 and waits for R2, P2 holds R2 and waits for R3, and P3 holds R3 and waits for R1, which deadlock condition is primarily demonstrated?

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Operating Systems - Deadlock - Four Necessary Conditions (Coffman)
Given three processes P1, P2, and P3 where P1 holds resource R1 and waits for R2, P2 holds R2 and waits for R3, and P3 holds R3 and waits for R1, which deadlock condition is primarily demonstrated?
ANo Preemption
BMutual Exclusion
CCircular Wait
DHold and Wait
Step-by-Step Solution
Solution:

  1. Step 1: Understand Circular Wait

    Circular wait occurs when a set of processes are waiting for each other in a circular chain.

  2. Step 2: Analyze the scenario

    Here, P1 waits for R2 held by P2, P2 waits for R3 held by P3, and P3 waits for R1 held by P1, forming a cycle.

  3. Final Answer:

    Option C -> Option C

  4. Quick Check:

    Processes waiting in a cycle [OK]
Quick Trick: Processes waiting in a cycle form circular wait [OK]
Common Mistakes:
MISTAKES
  • Confusing circular wait with hold and wait
  • Assuming mutual exclusion is the main issue here
  • Thinking no preemption applies in this scenario
Trap Explanation:
PITFALL
  • Hold and wait is present but the key condition is the circular chain of waiting.
Interviewer Note:
CONTEXT
  • Tests ability to identify circular wait condition from resource allocation scenario.
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