,（1）一个理发店接待室有n张椅子，工作室有1张椅子； （2）没有顾客时，理发师睡觉； （3）第一个顾客来到时，必须将理发师唤醒； （4）顾客来时如果还有空座的话，他就坐在一个座位上等待； （5）如果顾客来时没有空座位了，他就离开，不理发了； （6）当理发师处理完所有顾客，而又没有新顾客来时，他又开始睡觉。用条件变量实现(3张椅子)-, (1) a barber shop reception room with n chairs, studios have a chair　(2) no customers, the barber sleep　(3) the first customer arrives, the barber must wake up　(4 ) to the customer if there are empty seats, then when he sat on a seat to wait　(5) If the customer to an empty seat when not, and he left, not a haircut　(6) When the barber finished with all customers, but no new customers to come, he began to sleep. With the condition variable implementation (three chairs)