队列 Queue 与 生产者消费模型

队列：先进先出

# from multiprocessing import  Queue
# Q = Queue(4)

# Q.put('a')
# Q.put('b')
# Q.put('b')
# Q.put('c')

# print(Q.get())
# print(Q.get())
# print(Q.get())
# print(Q.get())

生产者消费模型

from multiprocessing import Process,Queue
import random,time

def product(name,food,Q):
    for i in range(3):
        res = '%s %s'%(food,i)
        Q.put(res)
        time.sleep(random.randint(1,3))
        print('%s 生产了 %s' %(name,res))

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

if __name__ == '__main__':
    Q = Queue()
    p1 = Process(target=product,args=('wxx','包子',Q))   # 生产者
    p2 = Process(target=product, args=('yxx', '馒头', Q))  # 生产者
    p3 = Process(target=product, args=('zxx', '粉丝', Q))  # 生产者

    c1 = Process(target=consumer,args=('axx',Q))  # 消费者
    c2 = Process(target=consumer, args=('bxx', Q))  # 消费者

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

    c1.start()
    c2.start()

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

    Q.put(None)
    Q.put(None)

    print('主...')

模型1

from multiprocessing import Process,JoinableQueue
import random,time

def product(name,food,Q):
    for i in range(3):
        res = '%s %s'%(food,i)
        Q.put(res)
        time.sleep(random.randint(1,3))
        print('%s 生产了 %s' %(name,res))

def consumer(name,Q):
    while True:
        res = Q.get()
        time.sleep(random.randint(1,3))
        print('%s 吃了 %s' % (name, res))
        Q.task_done()    # 队列取完信号

if __name__ == '__main__':
    Q = JoinableQueue()  # 队列链接
    p1 = Process(target=product,args=('wxx','包子',Q))   # 生产者
    p2 = Process(target=product, args=('yxx', '馒头', Q))  # 生产者
    p3 = Process(target=product, args=('zxx', '粉丝', Q))  # 生产者

    c1 = Process(target=consumer,args=('axx',Q))  # 消费者
    c2 = Process(target=consumer, args=('bxx', Q))  # 消费者

    c1.daemon = True
    c2.daemon = True

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

    c1.start()
    c2.start()

    p1.join()
    p2.join()
    p3.join()    # 保证生产者生产完

    Q.join()     # 保证队列取完

    print('主...')