In operating systems, what is the full form of RAG?
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A.
Resource Append Graph
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B.
Risk Approach Graph
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C.
Risk Allocation Graph
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D.
Resource Allocation Graph
Correct Answer:
D. Resource Allocation Graph
Explanation:
The correct answer is Resource Allocation Graph.
In operating systems, a Resource Allocation Graph (RAG) is a visual tool used to represent the current state of a system's resources and processes. It is a directed graph where nodes represent either processes (usually shown as circles) or resources (usually shown as rectangles).
This tool is primarily used for deadlock detection. By mapping the relationships between processes holding resources (assignment edges) and processes waiting for resources (request edges), the system can identify cycles. In systems where resources have only a single instance, the presence of a cycle in the graph directly indicates a deadlock. For resources with multiple instances, a cycle is a necessary but not always sufficient condition for a deadlock to exist.
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