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Questions and Answers
What is the term used to describe a situation where a process requests resources that are held by other waiting processes?
What is the term used to describe a situation where a process requests resources that are held by other waiting processes?
- Resource preemption
- Resource contention
- Resource deadlock (correct)
- Resource utilization
What condition for deadlock arises when a process holding at least one resource is waiting to acquire additional resources held by other processes?
What condition for deadlock arises when a process holding at least one resource is waiting to acquire additional resources held by other processes?
- Hold and wait (correct)
- Circular wait
- No preemption
- Mutual exclusion
Which condition for deadlock arises when a set of processes are each waiting for a resource held by another process in the set?
Which condition for deadlock arises when a set of processes are each waiting for a resource held by another process in the set?
- Hold and wait
- Mutual exclusion
- No preemption
- Circular wait (correct)
What term describes the situation where only one process at a time can use a resource?
What term describes the situation where only one process at a time can use a resource?
What does the 'Safety Algorithm' used to check?
What does the 'Safety Algorithm' used to check?
Which algorithm is used to identify and recover from deadlock?
Which algorithm is used to identify and recover from deadlock?
What does the 'Wait-for graph' represent in deadlock detection?
What does the 'Wait-for graph' represent in deadlock detection?
Which data structures are used for resource management?
Which data structures are used for resource management?
How can recovery from deadlock be achieved through resource preemption?
How can recovery from deadlock be achieved through resource preemption?
What does the 'Detection Algorithm' check for?
What does the 'Detection Algorithm' check for?
What scenario can lead to deadlock?
What scenario can lead to deadlock?
What does the 'Resource-Request Algorithm for Process Pi' outline?
What does the 'Resource-Request Algorithm for Process Pi' outline?
'Banker’s Algorithm Example' demonstrates the use of which algorithm on a specific system configuration?
'Banker’s Algorithm Example' demonstrates the use of which algorithm on a specific system configuration?
What can be achieved through process termination in recovery from deadlock?
What can be achieved through process termination in recovery from deadlock?
What is the primary method for modeling deadlock situations in the context of multi-threading and resource allocation?
What is the primary method for modeling deadlock situations in the context of multi-threading and resource allocation?
When does a deadlock occur in the context of resource-allocation graphs?
When does a deadlock occur in the context of resource-allocation graphs?
Which method involves requiring a process to request all resources before execution to prevent deadlocks?
Which method involves requiring a process to request all resources before execution to prevent deadlocks?
Which algorithm is mentioned as a way of implementing deadlock avoidance in the text?
Which algorithm is mentioned as a way of implementing deadlock avoidance in the text?
What does the banker's algorithm ensure in relation to deadlock avoidance?
What does the banker's algorithm ensure in relation to deadlock avoidance?
In the context of deadlock prevention, what does imposing a total ordering of resource requests involve?
In the context of deadlock prevention, what does imposing a total ordering of resource requests involve?
What is the purpose of the resource-allocation graph algorithm?
What is the purpose of the resource-allocation graph algorithm?
What is one of the prevention methods for deadlocks mentioned in the text?
What is one of the prevention methods for deadlocks mentioned in the text?
What does avoidance methods for deadlocks entail?
What does avoidance methods for deadlocks entail?
What are represented as vertices in a resource-allocation graph?
What are represented as vertices in a resource-allocation graph?
What is one of the key requirements of the banker's algorithm?
What is one of the key requirements of the banker's algorithm?
Study Notes
- The text discusses the concept of deadlocks in the context of multi-threading and resource allocation.
- Two threads, P1 (thread_one) and P2 (thread_two), are waiting for resources held by each other in a deadlock situation.
- The text then introduces the concept of resource-allocation graphs to model deadlock situations.
- A process (or thread) and a resource type are represented as vertices in a graph, and edges represent requests and assignments of resources.
- A deadlock occurs when a cycle exists in the resource-allocation graph.
- Prevention methods for deadlocks include requiring a process to request all resources before execution or imposing a total ordering of resource requests.
- Avoidance methods for deadlocks involve ensuring that a system will never enter an unsafe state, by checking if a system can deliver all requested resources to a process without entering a deadlock state.
- The text mentions the resource-allocation graph algorithm and the banker's algorithm as a way of implementing deadlock avoidance.
- The text provides a brief description of the banker's algorithm, including its requirements, data structures, and steps.
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Description
This quiz covers the concept of deadlocks in a multiprogramming environment where processes compete for finite resources. It explores the scenario where processes enter a waiting state due to unavailable resources held by other waiting processes.
