python多进程实现进程间通信实例

#- * -coding: utf - 8 - * -
  from multiprocessing
import Process, Queue
import os
import time
import 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()
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()

Process to read: 5836
Process to write: 6472
Put A to queue...
Put B to queue...
Get A from queue.
Put C to queue...
Get B from queue.
Get C from queue.

Process finished with exit code 0

#- * -coding: utf - 8 - * -
  from multiprocessing
import Process, Pipe

def f(conn):
  conn.send([42, None, 'hello'])
while True:
  print(conn.recv())

if __name__ == '__main__':
  parent_conn, child_conn = Pipe()
p = Process(target = f, args = (child_conn, ))
p.start()
print parent_conn.recv()# prints "[42, None, 'hello']"
parent_conn.send('666')
p.terminate()

[42, None, 'hello']
666

Process finished with exit code 0