Python multiprocessing模組中的Pipe管道

標籤：管道

multiprocessing.Pipe([duplex]) 

返回2個連線物件(conn1, conn2),代表管道的兩端,預設是雙向通訊.如果duplex=False,conn1隻能用來接收訊息,conn2隻能用來發送訊息.不同於os.open之處在於os.pipe()返回2個檔案描述符(r, w),表示可讀的和可寫的

執行個體如下:

#!/usr/bin/python

#coding=utf-8

import os

from multiprocessing import Process, Pipe

def send(pipe):

    pipe.send([‘spam‘] + [42, ‘egg‘])

    pipe.close()

def talk(pipe):

    pipe.send(dict(name = ‘Bob‘, spam = 42))

    reply = pipe.recv()

    print(‘talker got:‘, reply)

if __name__ == ‘__main__‘:

    (con1, con2) = Pipe()

    sender = Process(target = send, name = ‘send‘, args = (con1, ))

    sender.start()

    print "con2 got: %s" % con2.recv()#從send收到訊息

    con2.close()

    (parentEnd, childEnd) = Pipe()

    child = Process(target = talk, name = ‘talk‘, args = (childEnd,))

    child.start()

    print(‘parent got:‘, parentEnd.recv())

    parentEnd.send({x * 2 for x in ‘spam‘})

    child.join()

    print(‘parent exit‘)

輸出如下:

con2 got: [‘spam‘, 42, ‘egg‘]

(‘parent got:‘, {‘name‘: ‘Bob‘, ‘spam‘: 42})

(‘talker got:‘, set([‘ss‘, ‘aa‘, ‘pp‘, ‘mm‘]))

parent exit

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Python multiprocessing模組中的Pipe管道