生产消费者模型代码示例

import time
import random
from multiprocessing import Process,Queue
def producer(q,name,food):
    for i in range(4):
        time.sleep(random.random())
        f = "{}生产出一个{}".format(name,food)
        print(f)
        q.put(f)
def consumer(q,name):
    while True:
        food = q.get()
        if food is None:
            print("{}获取空，退出".format(name))
            break
        time.sleep(random.random())
        print("{}消费了一个{}".format(name,food))

if __name__ == '__main__':
    q = Queue(10)
    p1 = Process(target=producer,args=(q,"生产者1号","包子"))
    p2 = Process(target=producer,args=(q,"生产者2号","馒头"))
    c1 = Process(target=consumer,args=(q,"消费者1号"))
    c2 = Process(target=consumer,args=(q,"消费者2号"))
    c3 = Process(target=consumer,args=(q,"消费者3号"))
    p1.start()
    p2.start()
    c1.start()
    c2.start()
    c3.start()
    p1.join()
    p2.join()
    q.put(None)
    q.put(None)
    q.put(None)

import time
import random
from multiprocessing import Process,JoinableQueue
def producer(q,name,food):
    for i in range(4):
        time.sleep(random.random())
        f = "{}生产出一个{}".format(name,food)
        print(f)
        q.put(f)
    q.join()   #生产周期变长，要等到所生产的数据被处理完，这个子进程才结束
def consumer(q,name):
    while True:
        food = q.get()
        time.sleep(random.random())
        print("{}消费了一个{}".format(name,food))
        q.task_done()

if __name__ == '__main__':
    q = JoinableQueue(10)
    p1 = Process(target=producer,args=(q,"生产者1号","包子"))
    p2 = Process(target=producer,args=(q,"生产者2号","馒头"))
    c1 = Process(target=consumer,args=(q,"消费者1号"))
    c2 = Process(target=consumer,args=(q,"消费者2号"))
    c3 = Process(target=consumer,args=(q,"消费者3号"))
    p1.start()
    p2.start()
    c1.daemon = True  #设置为守护进程，主进程中的代码执行完毕之后，该守护进程自动结束
    c2.daemon = True
    c3.daemon = True
    c1.start()
    c2.start()
    c3.start()
    p1.join()   #感知一个进程的结束
    p2.join()