Deadlock prevention strategies in Operating Systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the Mutual Exclusion Condition

Which statement best describes how deadlock prevention handles the mutual exclusion condition?

A It requires processes to request all needed resources at once to avoid waiting.

B It forces processes to release all resources before requesting new ones to prevent holding multiple resources.

C It ensures that resources can be shared by multiple processes simultaneously to avoid exclusive locks.

D It allows processes to wait indefinitely for resources to become available.

💡 Hint

Think about how allowing multiple processes to use the same resource affects deadlocks.

Mutual exclusion means only one process can use a resource at a time. Deadlock prevention can avoid this by making resources sharable, so no process waits exclusively.

📋 Factual

intermediate

Identifying the Hold and Wait Condition

Which deadlock prevention strategy directly targets the hold and wait condition?

A Processes must request all required resources before execution begins.

B Processes are allowed to hold resources while waiting for others.

C Resources are made sharable to avoid exclusive locks.

D Processes can release resources only after completing their tasks.

💡 Hint

Consider how requesting all resources upfront affects waiting.

By requiring processes to request all resources at once, the hold and wait condition is prevented because processes do not hold some resources while waiting for others.

🔍 Analysis

advanced

Evaluating the Preemption Strategy

What is a potential drawback of the preemption strategy in deadlock prevention?

A It may cause starvation because some processes never get resources back once taken.

B It can lead to inefficient resource use because processes must release all resources if new ones are unavailable.

C It allows processes to hold resources indefinitely, increasing deadlock risk.

D It forces processes to share resources, which can cause data corruption.

💡 Hint

Think about what happens when a process cannot get a new resource and must give up what it holds.

Preemption means if a process cannot get a requested resource, it must release all held resources and try again later, which can reduce efficiency.

❓ Comparison

advanced

Comparing Deadlock Prevention Strategies

Which deadlock prevention strategy is most restrictive but guarantees no deadlock by eliminating the circular wait condition?

A Allowing processes to request resources in any order but preempting if deadlock risk arises.

B Requiring processes to request all resources at once before execution.

C Making all resources sharable to avoid exclusive locks.

D Ordering all resource types and forcing processes to request resources in increasing order.

💡 Hint

Think about how ordering resource requests can prevent cycles.

By assigning a fixed order to resource types and forcing processes to request them in that order, circular wait is prevented, eliminating deadlocks.

❓ Reasoning

expert

Choosing the Best Strategy for a High-Performance System

A system requires high performance and minimal resource waiting. Which deadlock prevention strategy is least likely to be suitable?

A Requesting all resources at once before execution to avoid hold and wait.

B Forcing processes to request resources in a strict order to prevent circular wait.

C Allowing preemption of resources to avoid indefinite holding.

D Making resources sharable to eliminate mutual exclusion.

💡 Hint

Consider how requesting all resources upfront affects system responsiveness.

Requesting all resources at once can cause delays and reduce performance because processes wait longer before starting execution.