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Module 4: Deadlocks

20227m

Write necessary conditions that must hold simultaneously to arise deadlock situation. Briefly explain different deadlock handling mechanisms.

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Necessary Conditions (Coffman)

1 Mutual Exclusion 2 Hold-and-Wait 3 No Preemption 4 Circular Wait

Handling

  • Prevention (break one condition)
  • Avoidance (Banker's, safe state)
  • Detection & Recovery (wait-for graph, kill/preempt)
  • Ignorance (ostrich, used by Unix/Windows)

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