Resource Allocation Graph Questions: Deadlock in Operating Systems Quiz

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Questions and Answers

In the first detection example, which process(es) can be marked as completed without leading to a deadlock?

P4 only

What is the purpose of the Banker's Algorithm?

To identify safe and unsafe states in resource allocation

In the second detection example, what is the maximum number of processes that can be granted their requested resources without leading to a deadlock?

What is the purpose of the Resource Allocation Graph (RAG)?

All of the above Signup and view all the answers

In a safe state, what is true about the sequence of processes that can be executed?

All processes can eventually complete their execution Signup and view all the answers

What is a necessary condition for a deadlock to occur?

All of the above Signup and view all the answers

What is the purpose of the Banker's Algorithm?

To avoid deadlocks by ensuring a safe state Signup and view all the answers

In the context of the Banker's Algorithm, what is a safe state?

A state where there exists a sequence of resource allocations that allows all processes to complete Signup and view all the answers

What is the purpose of the resource allocation vector (R) in the Banker's Algorithm?

It represents the current resource allocations to each process Signup and view all the answers

In a resource allocation graph, what does a cycle represent?

A deadlock situation Signup and view all the answers

What is the purpose of the resource request vector (V) in the Banker's Algorithm?

It represents the resources requested by each process Signup and view all the answers

What is the primary cause of the deadlock described in the text?

A design error in the system Signup and view all the answers

How can deadlocks be dealt with in the system?

Detecting and resolving cycles in the resource allocation graph Signup and view all the answers

In the Banker's Algorithm, when is a resource request granted?

When granting the request would not lead to an unsafe state Signup and view all the answers

In the resource allocation graph described in the text, what do the directed edges from a process to a resource represent?

The process is requesting the resource Signup and view all the answers

What is the relationship between the presence of a cycle in the resource allocation graph and the existence of a deadlock?

If the graph contains a cycle, then a deadlock may exist Signup and view all the answers

What is the purpose of the Banker's algorithm mentioned in the text?

To prevent the occurrence of deadlocks in the system Signup and view all the answers

Study Notes

Resource Allocation and Deadlocks

A system consists of four processes (P1, P2, P3, P4) and three resources (A, B, C).
Allocation and request matrices are used to track the allocation of resources to processes.

Deadlock Detection Example 1

P1 is holding resource A, P2 is holding resource B, and P3 is holding resource C.
P4 is not holding any resources and is waiting for resource A.
Since P4 is not holding any resources, it is not deadlocked.

Deadlock Detection Example 2

P1, P2, P3, P4, and P5 are processes that request resources A, B, and C.
A deadlock occurs if P1, P2, P3, P4, and P5 cannot be marked (i.e., executed) due to unavailability of resources.

Concurrency and Deadlocks

A deadlock occurs when a set of processes are blocked, each waiting for another process in the set to release a resource.
A system is in a safe state if there exists a sequence of resource allocations that allows all processes to run to completion.

Resource Allocation Graphs

A resource-allocation graph consists of vertices (processes and resources) and edges (requests and assignments).
A cycle in the graph indicates a potential deadlock.
If the graph contains no cycles, no process in the system is deadlocked.

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Resource Allocation and Deadlock in Operating Systems

Questions and Answers

In the first detection example, which process(es) can be marked as completed without leading to a deadlock?

What is the purpose of the Banker's Algorithm?

In the second detection example, what is the maximum number of processes that can be granted their requested resources without leading to a deadlock?

What is the purpose of the Resource Allocation Graph (RAG)?

In a safe state, what is true about the sequence of processes that can be executed?

What is a necessary condition for a deadlock to occur?

What is the purpose of the Banker's Algorithm?

In the context of the Banker's Algorithm, what is a safe state?

What is the purpose of the resource allocation vector (R) in the Banker's Algorithm?

In a resource allocation graph, what does a cycle represent?

What is the purpose of the resource request vector (V) in the Banker's Algorithm?

What is the primary cause of the deadlock described in the text?

How can deadlocks be dealt with in the system?

In the Banker's Algorithm, when is a resource request granted?

In the resource allocation graph described in the text, what do the directed edges from a process to a resource represent?

What is the relationship between the presence of a cycle in the resource allocation graph and the existence of a deadlock?

What is the purpose of the Banker's algorithm mentioned in the text?

Study Notes

Resource Allocation and Deadlocks

Deadlock Detection Example 1

Deadlock Detection Example 2

Concurrency and Deadlocks

Resource Allocation Graphs

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