queue队列消费者生产者测试

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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。