Java Multithreading and Parallel Programming Masterclass - Sleeping Barber Problem

The video tutorial discusses the barbershop problem, a classic synchronization problem in multithreading. It explains the problem's setup, where a barber and customers interact in a barbershop with limited waiting room seats. The tutorial covers the implementation of the problem using Java, focusing on creating threads for the barber and customers, and using locks and semaphores to manage synchronization and communication between them. The video also demonstrates running the program and suggests enhancements, emphasizing the importance of understanding these concepts for multithreading projects.

What happens when a customer arrives at a full barbershop?

• The customer wakes the barber.

• The customer sits on the floor.

• The customer leaves the shop.

• The customer waits outside.

In the sleeping barber problem, what does the barber do when there are no customers?

• Closes the shop.

• Calls for more customers.

• Goes to sleep.

• Starts cleaning the shop.

How are the barber and customers represented in the threading model?

• As a single thread.

• As different processes.

• As different threads.

• As a single process.

What is the purpose of using a lock in the implementation?

• To allow multiple threads to update simultaneously.

• To speed up the process.

• To make the code more complex.

• To prevent race conditions.

What is the initial value of the semaphore used to signal the barber?

• 5

• 1

• 10

• 0

What does the customer do after signaling the barber that they have arrived?

• Pays the barber.

• Waits for the barber to be ready.

• Starts the haircut.

• Leaves the shop.

What is the role of the 'Barber finished' semaphore?

• To lock the barber's chair.

• To signal the barber to start a new haircut.

• To release the customer from the waiting room.

• To indicate the barber is done with the current haircut.

How does the barber know which customer is next for a haircut?

• By random selection.

• By asking the waiting customers.

• By using a semaphore to get the customer's name.

• By checking a list.

What happens to the barber thread when there are no more customers?

• It terminates immediately.

• It goes into an error state.

• It waits for new customers.

• It starts cleaning the shop.

What is a suggested variation to the sleeping barber problem?

• Changing the number of seats dynamically.

• Adding more barbers.

• Allowing customers to cut their own hair.

• Transferring customer names to the barber thread.