Python进程间通信Queue实例解析

#!/usr/bin/env python3

import time
from multiprocessing import Process,Queue

q = Queue() #创建列队，不传数字表示列队不限数量
for i in range(11):
  q.put(i)

def A():
  while 1:
    try:
      num = q.get_nowait()
      print('我是进程A,取出数字:%d'%num)
      time.sleep(1)
    except :
      break

def B():
  while 1:
    try:
      num = q.get_nowait()
      print('我是进程B,取出数字:%d'%num)
      time.sleep(1)
    except :
      break

p1 = Process(target = A)
p2 = Process(target = B)
p1.start()
p2.start()

#!/usr/bin/env python3

import time
from multiprocessing import Pool,Manager,Queue

q = Manager().Queue()
for i in range(11):
  q.put(i)

def A(i):
  num = q.get_nowait()
  print('我是进程%d,取出数字:%d'%(i,num))
  time.sleep(1)
      

pool = Pool(3)

for i in range(10):
  pool.apply_async(A,(i,))

pool.close()
pool.join()

import time
from multiprocessing import Process,Queue

MSG_QUEUE = Queue(5)

def startA(msgQueue):
  while True:
    if msgQueue.empty() > 0:
      print 'queue is empty %d' % (msgQueue.qsize())
    else:
      msg = msgQueue.get()
      print 'get msg %s' % (msg,)
    time.sleep(1)

def startB(msgQueue):
  while True:
    msgQueue.put('hello world')
    print 'put hello world queue size is %d' % (msgQueue.qsize(),)
    time.sleep(3)

if __name__ == '__main__':
  processA = Process(target=startA,args=(MSG_QUEUE,))
  processB = Process(target=startB,args=(MSG_QUEUE,))

  processA.start()
  print 'processA start..'

  processB.start()
  print 'processB start..'