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Module 4: Deadlocks

20247m

Explain the core principle behind Deadlock Avoidance. Draw a Resource-allocation graph with a cycle but no deadlock.

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Deadlock Avoidance Principle

Requires safe state check before grant. Resource allocation graph with cycle but no deadlock: use multiple instances. Example: 2 instances of R1, P1 holds R1, P2 holds R1, P1 requests R2, P2 requests R2 held elsewhere — cycle exists but extra instance breaks deadlock. Draw RAG with cycle and extra resource free.

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PreviousWhat is the difference between fixed partition and variable partition also explains the need of compaction.NextConsider a system with five processes P0 through P4 and four resources type A, B, C and D. Using the Banker's algorithm answer that the system is in a safe state? | | Allocation | Max | Available | | :--- | :--- | :--- | :--- | | | A B C D | A B C D | A B C D | | P0 | 0 0 1 2 | 0 0 1 2 | 1 5 2 0 | | P1 | 1 0 0 0 | 1 7 5 0 | | | P2 | 1 3 5 4 | 2 3 5 6 | | | P3 | 0 6 3 2 | 0 6 5 2 | | | P4 | 0 0 1 4 | 0 6 5 6 | |
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