生产者消费者模型

第一种实现方案

生产者生产完,让生生产告诉主进程他们已经结束,让后主进程给消费者发一个结束指令,消费者拿出所有产品,等拿到结束指令结束

from multiprocessing import Queue,Process,JoinableQueue

def producer(name,food,q):
    for i in range(10):
        res = "%s%s"%(food,i)
        time.sleep(random.randint(1,2))
        q.put(res)
        print('厨师[%s]做了[%s]%s'%(name,food,i))



def consumer(name,q):
    while True:
        res = q.get()
        if res is None:break
        time.sleep(random.randint(1,3))
        print('吃货[%s]吃了[%s]'%(name,res))

if __name__ == '__main__':
    q = Queue()

    p1 = Process(target=producer,args=('刘大厨','包子',q))
    p2 = Process(target=producer,args=('李大厨','馒头',q))
    p3 = Process(target=producer,args=('林大厨','辣条',q))

    c1 = Process(target=consumer,args=('张三',q)).start()
    c2 = Process(target=consumer,args=('李四',q)).start()

    p1.start()
    p2.start()
    p3.start()

    p1.join()
    p2.join()
    p3.join()

    q.put(None)
    q.put(None)

    print('主进程的活干完了waiting...............')

 第二种实现方案

第二种实现方案,就是在用JoinableQueue,等消费者拿完所有的产品结束,q.task_done()告诉队列结束,q.join()结束意味着所有都拿完,让消费者作为主进程的守护进程,
与主进程一同结束

from multiprocessing import Queue,Process,JoinableQueue

def producer(name,food,q):
    for i in range(10):
        res = "%s%s"%(food,i)
        time.sleep(random.randint(1,2))
        q.put(res)
        print('厨师[%s]做了[%s]%s'%(name,food,i))



def consumer(name,q):
    while True:
        res = q.get()
        # if res is None:break
        time.sleep(random.randint(1,3))
        print('吃货[%s]吃了[%s]'%(name,res))
        q.task_done()

if __name__ == '__main__':
    q = JoinableQueue()

    p1 = Process(target=producer,args=('刘大厨','包子',q))
    p2 = Process(target=producer,args=('李大厨','馒头',q))
    p3 = Process(target=producer,args=('林大厨','辣条',q))

    c1 = Process(target=consumer,args=('张三',q))
    c2 = Process(target=consumer,args=('李四',q))

    c1.daemon = True
    c2.daemon = True

    p1.start()
    p2.start()
    p3.start()

    c1.start()
    c2.start()

    p1.join()
    p2.join()
    p3.join()

    q.join()

    print('主进程的活干完了waiting...............')