I need help with semaphores and wait/ signal problem. please explain your steps .

5. (15 points) A barbershop is designed so that there is a private room containing the barber chair and an adjoining waiting room with a sliding door that contains k chairs. If the barber is busy, then the door to the private room is closed and arriving customers sit in one of the available chairs and waits for his/her turn. If no chair is available, the customer leaves the shop without an haircut. If there is no customer to be served, the barber goes to sleep in the barber chair with the door to the waiting room open. If the barber is asleep, a newly arrived customer wakes the barber and obtains a haircut. Use semaphores and wait/signal operations to synchronize the barber and customer processes else