生产者消费者模型

from multiprocessing import Process, JoinableQueue
import time
import random


def producer(name, food, q):
    for i in range(5):
        data = '%s生产了%s%s' % (name, food, i)
        time.sleep(random.randint(1, 3))
        print(data)
        q.put('%s生产的%s%s' % (name, food, i))


def consumer(name, q):
    while True:
        food = q.get()
        time.sleep(random.randint(1, 3))
        print('%s吃了%s' % (name, food))
        q.task_done()  # 告诉队列已经从里面取出一个数据并处理完毕


if __name__ == '__main__':
    q = JoinableQueue()  # 存一个数据，内部计数+1，取一个，计数器—1
    p1 = Process(target=producer, args=('egon', '包子', q))
    p2 = Process(target=producer, args=('tank', '火锅', q))
    c1 = Process(target=consumer, args=('小明', q))
    c2 = Process(target=consumer, args=('天王盖地虎', q))
    p1.start()
    p2.start()
    c1.daemon = True
    c2.daemon = True
    p1.join()  # 让主进程等待子进程运行结束之后再运行
    p2.join()
    c1.start()
    c2.start()
    # p1.join()  # 让主进程等待子进程运行结束之后再运行
    # p2.join()
    q.join()  # 基于JoinableQueue,q.join() 当计数器为0的时候 才往后运行