#!/usr/bin/python
#coding:utf-8
'''
单进程模型，进程间通信，支持Queue和pip，此实例为queue
'''
from multiprocessing import Process, Queue

import os, time, random

 

# 写数据进程执行的代码:

def write(q):
  print('Process to write: %s' % os.getpid())
  for value in ['A', 'B', 'C']:
    print('Put %s to queue...' % value)
    q.put(value)
    time.sleep(random.random())

 

# 读数据进程执行的代码:

def read(q):
  print('Process to read: %s' % os.getpid())
  while True:
    value = q.get(True)
    print('Get %s from queue.' % value)

 

if __name__=='__main__':

  # 父进程创建Queue，并传给各个子进程：
  q = Queue()
  pw = Process(target=write, args=(q,))
  pr = Process(target=read, args=(q,))

  # 启动子进程pw，写入:
  pw.start()
  # 启动子进程pr，读取:
  pr.start()
  # 等待pw结束:
  pw.join()

  # pr进程里是死循环，无法等待其结束，只能强行终止:
  pr.terminate()