python3 多线程使用 joinablequeue 两层嵌套后使用后不能自动退出时什么原因？

请问如何能将让下方的代码进程自动退出```python
import requests
import time
from multiprocessing import Process
from multiprocessing import JoinableQueue as Queue
from time import sleep
import random

class Bai:
def init(self):
self.html_queue = Queue()
self.content_list_queue = Queue()

def parse_url(self):
    for i in range(5):
        sleep(0.5)
        self.html_queue.put(i)
        print('生成了一个',i)    
    self.html_queue.join()    

def get_content_list(self):
    while True:
        html = self.html_queue.get()
        sleep(1.2)
        self.content_list_queue.put(html)
        self.html_queue.task_done()
        print('处理了一个')
    self.content_list_queue.join()

def save_content_list(self):
    #保存
    while True:
        content_list = self.content_list_queue.get()
        self.content_list_queue.task_done()
        print('保存了一个',content_list)


def run(self):
    t_parse1 = Process(target=self.parse_url)
    t_content = Process(target=self.get_content_list)
    t_save = Process(target=self.save_content_list)

    #t_content.daemon= True
    t_save.daemon = True

    t_parse1.start()
    t_content.start()
    t_save.start()


    t_parse1.join()
    t_content.join()

    print('主线程结束')

if name == ‘main‘:

t1 = time.time()
bai = Bai()
bai.run()
print("total cost:",time.time()-t1)

```