python 多进程之管道实例（模板）

原文地址：http://blog.chinaunix.net/uid-20393955-id-3084628.html

#!/usr/bin/env python# -*- coding: utf-8 -*-import multiprocessing# 管道消费者.def consumer(lock,pipe):    output_p, input_p = pipe    input_p.close() # 关闭管道输入口    while True:    lock.acquire()                item = output_p.recv()    lock.release()    if item == None:                break                # 处理部分        lock.acquire()        print(item)        lock.release()# 管道生产者def producer(sequence, input_p):    for item in sequence:        # Put the item on the queue        input_p.send(item)        if __name__ == '__main__':        # 进程数、创建管道，锁等    p_num = 2    process = []        (output_p, input_p) = multiprocessing.Pipe()    lock = multiprocessing.Lock()        # 定义消费进程    for i in range(p_num):        t =multiprocessing.Process(target=consumer,args=(lock,(output_p, input_p),))              t.daemon=True        process.append(t)        # 启动消费进程    for i in range(p_num):        process[i].start()            # 关闭输出管道，以往管道填充数据    output_p.close()    sequence = range(100) + [None]*p_num       producer(sequence, input_p)        # 数据填充完毕，打开输入管道    input_p.close()        # 等待结束    for i in range(p_num):        process[i].join()