Classic problems (producer-consumer, readers-writers, dining philosophers) in Operating Systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the Producer-Consumer Problem

In the classic producer-consumer problem, what is the main purpose of using a buffer between the producer and consumer?

A To prevent the consumer from producing items faster than the producer

B To store produced items temporarily until the consumer is ready to consume them

C To allow the producer to consume items directly without waiting

D To synchronize the producer and consumer by making them run sequentially

💡 Hint

Think about why the producer and consumer might not work at the same speed.

The buffer acts as temporary storage so the producer can keep producing even if the consumer is not ready yet. This helps balance the speed difference between them.

📋 Factual

intermediate

Readers-Writers Problem: Priority Types

Which type of priority in the readers-writers problem can cause writers to starve if many readers keep accessing the resource?

A Reader priority

B No priority (fair scheduling)

C Writer priority

D Random priority

💡 Hint

Consider what happens if readers are always allowed first.

Reader priority lets readers access the resource whenever they want, which can block writers indefinitely if readers keep coming.

🔍 Analysis

advanced

Dining Philosophers: Deadlock Scenario

In the dining philosophers problem, what situation leads to a deadlock?

A Philosophers share forks without any restrictions

B Philosophers pick up forks randomly without waiting

C Philosophers eat without picking up any forks

D All philosophers pick up their left fork simultaneously and wait for the right fork

💡 Hint

Think about what happens if everyone holds one fork and waits for the other.

If all philosophers pick up their left fork at the same time, they all wait for the right fork, which is held by their neighbor, causing a deadlock.

❓ Comparison

advanced

Comparing Solutions to Readers-Writers Problem

Which solution to the readers-writers problem ensures no starvation for both readers and writers?

A Fair solution using a queue to order requests

B Writer priority solution

C Allowing unlimited readers and writers simultaneously

D Reader priority solution

💡 Hint

Consider a method that treats readers and writers equally over time.

A fair solution uses a queue to handle requests in order, preventing starvation of either readers or writers.

❓ Reasoning

expert

Resolving Deadlock in Dining Philosophers

Which strategy effectively prevents deadlock in the dining philosophers problem?

A Philosophers eat without using forks

B Philosophers always pick up the right fork first, then the left fork

C Allow philosophers to pick up both forks only if both are available simultaneously

D Philosophers pick up forks one at a time without checking availability

💡 Hint

Think about how to avoid holding one fork while waiting for another.

By requiring philosophers to pick up both forks at once or none, the system avoids the circular wait condition that causes deadlock.