EXP-9(VIVA_VOCE)

A deadlock avoidance algorithm dynamically examines the __________ to ensure that a circular wait condition can never exist.

• a) resource allocation state

• b) system storage state

• c) operating system

• d) resources

Answer explanation

A deadlock avoidance algorithm examines the resource allocation state to prevent circular wait conditions. By monitoring this state, it can ensure that resources are allocated in a way that avoids deadlocks.

A state is safe, if ____________

• a) the system does not crash due to deadlock occurrence

• b) the system can allocate resources to each process in some order and still avoid a deadlock

• c) the state keeps the system protected and safe

• d) all of the mentioned

Answer explanation

A state is safe if the system can allocate resources to each process in some order and still avoid a deadlock. This ensures that all processes can complete without getting stuck, making option b the correct choice.

A state is safe, if ____________

• a) the system does not crash due to deadlock occurrence

• b) the system can allocate resources to each process in some order and still avoid a deadlock

• c) the state keeps the system protected and safe

• d) all of the mentioned

Answer explanation

A state is safe if the system can allocate resources to each process in some order and still avoid a deadlock. This ensures that all processes can complete without getting stuck, making option b the correct choice.

Which of the following is a necessary condition for a deadlock to occur?

• a) mutual exclusion

• b) hold and wait

• c) no preemption

• d) all of the mentioned

Answer explanation

A deadlock requires all four conditions: mutual exclusion, hold and wait, no preemption, and circular wait. Therefore, the correct answer is d) all of the mentioned, as all are necessary for a deadlock to occur.

In a deadlock situation, which of the following resources cannot be released?

• a) resources held by a process

• b) resources in the system

• c) resources that are not allocated

• d) none of the mentioned

Answer explanation

In a deadlock, resources held by a process cannot be released because the process is waiting for other resources to become available. Thus, option a) is correct, as these resources are tied to the process's execution.

What is the primary goal of deadlock detection algorithms?

• a) to prevent deadlocks from occurring

• b) to identify deadlocks when they occur

• c) to recover from deadlocks

• d) to allocate resources efficiently

Answer explanation

The primary goal of deadlock detection algorithms is to identify deadlocks when they occur (choice b). Unlike prevention or recovery methods, detection focuses on recognizing existing deadlocks to take appropriate action.

Which of the following strategies can be used to prevent deadlocks?

• a) resource allocation graph

• b) wait-die scheme

• c) wound-wait scheme

• d) all of the mentioned

Answer explanation

All the strategies listed—resource allocation graph, wait-die scheme, and wound-wait scheme—are effective methods to prevent deadlocks in operating systems, making 'd) all of the mentioned' the correct choice.

What is the role of a resource allocation graph in deadlock detection?

• a) to visualize resource allocation

• b) to identify potential deadlocks

• c) to manage process states

• d) all of the mentioned

Answer explanation

A resource allocation graph helps identify potential deadlocks by showing the relationships between processes and resources. If a cycle is detected in the graph, it indicates a deadlock situation, making option b the correct choice.

Which of the following is NOT a method for recovering from a deadlock?

• a) process termination

• b) resource preemption

• c) process starvation

• d) wait for all processes to complete

Answer explanation

Option d) 'wait for all processes to complete' is not a recovery method for deadlock, as it does not resolve the deadlock situation. The other options involve actions that can help recover from a deadlock.

What is the main purpose of deadlock prevention techniques?

• a) to ensure that deadlocks never occur

• b) to detect deadlocks after they happen

• c) to recover from deadlocks

• d) to minimize resource usage