操作系统实现如下功能：假设理发店由等待间（ 2 个座位）和理发间（只有一个座位）构成，5 位顾客先后进入等待间，再进入理发间。试写出模拟理发师和顾客的程序，要求为每一个顾客创建一个线程

操作系统中的多线程模拟可以使用编程语言如Python来实现，这里我们采用线程池来模拟理发店的过程。下面是一个简单的Python示例：

import threading

class Customer(threading.Thread):
    def __init__(self, name, waiting_room, barber_shop):
        super().__init__()
        self.name = name
        self.waiting_room = waiting_room
        self.barber_shop = barber_shop
        self.waiting = True

    def run(self):
        print(f"{self.name} 进入等待间")
        self.waiting_room.append(self)
        self.waiting_room.notify()  # 当理发间有空闲时唤醒一个顾客
        self.waiting = False
        if not self.waiting_room.is_empty():
            print(f"{self.name} 等待完毕，进入理发间")
            self.barber_shop.take_customer(self)
        else:
            print(f"{self.name} 因为空等待区离开")

class WaitingRoom:
    def __init__(self):
        self.customers = []
        self.condition = threading.Condition()

    def is_empty(self):
        return len(self.customers) == 0

    def append(self, customer):
        with self.condition:
            self.customers.append(customer)
            if len(self.customers) == 2:
                self.condition.notify_all()
            elif len(self.customers) == 1 and not self.barber_shop.customer_in_service:
                self.condition.notify()

    def notify(self):
        with self.condition:
            self.condition.notify()

class BarberShop:
    def __init__(self):
        self.customer_in_service = None
        self.condition = threading.Condition()

    def take_customer(self, customer):
        with self.condition:
            self.customer_in_service = customer
            self.condition.notify()
            while self.customer_in_service is not None:
                self.condition.wait()

# 创建理发店资源
waiting_room = WaitingRoom()
barber_shop = BarberShop()

# 客户列表
customers = ["Customer1", "Customer2", "Customer3", "Customer4", "Customer5"]

# 启动客户线程
for i in customers:
    Customer(i, waiting_room, barber_shop).start()

print("所有顾客服务完毕，理发店结束")

在这个例子中，`Customer` 类代表顾客，`WaitingRoom` 类模拟等待间，`BarberShop` 类模拟理发间。顾客会先进入等待间，当理发间有空闲时，会从等待间转移到理发间进行理发。每个顾客都是一个独立的线程。