multiprocessing的进程通信Pipe和Queue

pipe管道，2个进程通信，允许单项或者双向，multiprocessing.Pipe(duplex=False)为单项，默认双向

示例：

from multiprocessing import Process,Pipe
import os

def proc1(pipe):
    pipe.send('hello')
    print('proc1 rec:',pipe.recv())

def proc2(pipe):
    print('proc2 rec:',pipe.recv())
    pipe.send('hello too')

pipe = Pipe()

p1 = Process(target=proc1,args=(pipe[0],))
p2 = Process(target=proc2,args=(pipe[1],))

p1.start()
p2.start()
p1.join()
p2.join()

Queue允许多个进程通信

示例：

import os,time
import multiprocessing

def inputQ(queue):
    info = str(os.getpid()) + '(put):' + str(time.time())
    queue.put(info)

def outputQ(queue,lock):
    info = queue.get()
    lock.acquire()
    print(str(os.getpid()) + '(get):' + info)
    lock.release()

rec1 = []
rec2 = []
lock = multiprocessing.Lock()
queue = multiprocessing.Queue(3)

for i in range(10):
    process = multiprocessing.Process(target=inputQ,args=(queue,))
    process.start()
    rec1.append(process)

for i in range(10):
    process = multiprocessing.Process(target=outputQ,args=(queue,lock))
    process.start()
    rec2.append(process)

for p in rec1:
    p.join()

queue.close()

for p in rec2:
    p.join()