queue队列消费者生产者测试

from multiprocessing import JoinableQueue
from threading import Thread

def worker(q):
	while True:
		try:
			item = q.get()
			print(item)
			if item % 5 == 0:
				if item == 5:
					time.sleep(20)
				q.put(111)
			q.task_done()
		except Exception as e:
			print(e)

q = JoinableQueue()

import time
def customer(q):
	for i in range(100):
		try:
			q.put(i)
		except Exception as e:
			print(e)
ct = Thread(target=customer, name='customer', args=(q,))
ct.daemon = True
ct.start()
ct.join()
for i in range(4):
	t = Thread(target=worker, name='worker'+str(i), args=(q,))
	t.daemon = True
	t.start()

q.join()
print('end')

一旦消费者速度快，生产者速度慢，可能导致提前结束

所以添加任务不能起一个线程，一直加，一旦速度慢下来，就提前结束了。

保险的是在worker中 task_done之前添加。