GATE CS 2018 Set 1 — Question 34
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Operating System → Deadlocks → Deadlock Numericals
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Question
Consider a system with 3 processes that share 4 instances of the same resource type. Each process can request a maximum of instances. Resource instances can be requested and released only one at a time. The largest value of that will always avoid deadlock is ____.
Correct answer
2 to 2
Solution
To ensure a system is always deadlock-free, the total number of resources () must be greater than the sum of the maximum needs of each process minus one. Formula: Given:
The largest integer value for that satisfies this inequality is 2.
- Number of processes () = 3
- Total resources () = 4
- Maximum demand of each process =
The largest integer value for that satisfies this inequality is 2.
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