python中multiprocessing模組之Pipe管道

標籤：python   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-8import osfrom multiprocessing import Process, Pipedef 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

python中multiprocessing模組之Pipe管道