4. In the barbershop examp customer () le, the code for the customer, barber and cashier are as follows barber () while (true) wait (max_capacity); enter shop ); wait (sofa) sit on sofa ); wait (barber_chair); get_up_from_sofa); signal (sofa),;' sit in barber chair)i signal (cust_ready) wait(finished); leave_barber_chair); siqnal (leave b chair); pay); signal (payment); wait (receipt); exit_shop ) signal (max_capacity);) wait (cust ready); wait (coord); cut hair signal (coord) signal (finished) ; wait (leave b chair); signal (barber_chair); cashier) while (true) wait (payment) wait (coord); accept_pay); signal (coord) signal (receipt); Explain what will happen if (a) We remove the following from the customer code signal (max_capacity)i (b) We swap the following statements in the barber code signal (coord) signal (finished) ; (c) We swap the following statements in the cashier code wait (payment); wait (coord); (d) We remove the following statements in the customer code signal (cust_ready); If a deadlock happens, explain how many threads progress and at what point they block. (12 points) 4. In the barbershop examp customer () le, the code for the customer, barber and cashier are as follows barber () while (true) wait (max_capacity); enter shop ); wait (sofa) sit on sofa ); wait (barber_chair); get_up_from_sofa); signal (sofa),;' sit in barber chair)i signal (cust_ready) wait(finished); leave_barber_chair); siqnal (leave b chair); pay); signal (payment); wait (receipt); exit_shop ) signal (max_capacity);) wait (cust ready); wait (coord); cut hair signal (coord) signal (finished) ; wait (leave b chair); signal (barber_chair); cashier) while (true) wait (payment) wait (coord); accept_pay); signal (coord) signal (receipt); Explain what will happen if (a) We remove the following from the customer code signal (max_capacity)i (b) We swap the following statements in the barber code signal (coord) signal (finished) ; (c) We swap the following statements in the cashier code wait (payment); wait (coord); (d) We remove the following statements in the customer code signal (cust_ready); If a deadlock happens, explain how many threads progress and at what point they block. (12 points)