Thread Safety in Operating System Concepts

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Questions and Answers

What is a necessary condition for a system to be in a safe state?

All threads can acquire all of the resources they need before they terminate. (correct)

There is no sequence of threads that can be terminated, one at a time, to acquire all the resources.

No thread can acquire all of the resources it needs before it terminates.

At least one thread can acquire all of the resources it needs before it terminates.

What is the primary goal of deadlock prevention techniques?

To prevent deadlocks by ensuring that at least one of the necessary conditions is never true (correct)

To recover from deadlocks once they occur

To detect deadlocks after they occur

To ignore deadlocks and hope they resolve on their own

What is the main purpose of the Resource-Allocation Graph scheme?

To allocate resources to threads in a system.

To prevent starvation in a system.

To detect deadlocks in a system.

To avoid deadlocks in a system. (correct)

What is the main difference between starvation and deadlock?

Starvation is when a thread is unable to gain access to a resource, while deadlock is when multiple threads are blocked indefinitely Signup and view all the answers

What is the resource allocation graph used for in deadlock avoidance?

To determine if a safe state exists and to find a safe sequence of resource allocations Signup and view all the answers

What is the key difference between deadlock and starvation?

Deadlock occurs when a thread is blocked indefinitely, while starvation occurs when a thread is blocked for a finite amount of time. Signup and view all the answers

Which algorithm is used for deadlock avoidance when there are multiple instances of a resource type?

Banker's algorithm. Signup and view all the answers

What is the primary goal of the Banker's algorithm?

To determine if a safe state exists and to find a safe sequence of resource allocations Signup and view all the answers

What is the main purpose of the Banker's algorithm?

To avoid deadlocks in a system. Signup and view all the answers

Which of the following is a characteristic of deadlock?

All of the above Signup and view all the answers

What happens to a request edge in the Resource-Allocation Graph when a resource is allocated to a thread?

It is converted to an assignment edge. Signup and view all the answers

What is the primary goal of deadlock detection algorithms?

To detect deadlocks after they occur and recover from them Signup and view all the answers

What is a condition for a thread to avoid deadlock?

Claiming maximum use of a resource a priori Signup and view all the answers

What is the purpose of the wait-for graph in deadlock detection?

To search for a cycle in the graph indicating a deadlock Signup and view all the answers

What is the difference between deadlock and starvation?

Deadlock is when a thread is waiting for a resource, while starvation is when a thread is not allocated any resources Signup and view all the answers

What is the purpose of the resource-allocation graph?

To visualize the allocation of resources to threads Signup and view all the answers

How many options are there for breaking a deadlock?

Two Signup and view all the answers

Study Notes

safe state = all threads acquire all resources before terminate

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Description

Determine if a system is in a safe state, analyzing resource availability and thread termination sequences. Based on Operating System Concepts, 10th Edition.