本文實例講述了Python實現(xiàn)的生產(chǎn)者、消費者問題。分享給大家供大家參考，具體如下：

生產(chǎn)者、消費者問題，經(jīng)典的線程同步問題：假設(shè)有一個緩沖池(列表)，生產(chǎn)者往里面放東西，消費者從里面取，規(guī)則是：列表為空的時候，生產(chǎn)者才能放東西；列表不為空的時候，消費者才能取東西；為了簡單起見，暫定緩沖池中最多只能有一個產(chǎn)品。這里生產(chǎn)者和消費者共同操作一個資源：緩沖池，因此每次操作的時候，需要給資源加鎖，操作結(jié)束時，釋放鎖，這樣才能做到資源同步。使用python實現(xiàn)，需要繼承Thread類，獲取鎖對象，代碼如下：

# -*- coding:utf-8 -*-#! python2from threading import Threadfrom threading import Lockimport time,randompro_list = []lock = Lock()class Producer(Thread):  def run(self):    global pro_list    while True:      i = random.randint(0, 100)      lock.acquire()      if len(pro_list) > 0:        print "!--product still in list, wait consumer to get it.."      else:        pro_list.append(i)        print ":::Producer put:", pro_list[0]      lock.release()      time.sleep(2)class Consumer(Thread):  def run(self):    global pro_list    while True:      lock.acquire()      if len(pro_list) == 0:        print "!--No product now, wait producer put in..."      else:        print ":::Consumer fetch:", pro_list[0]        pro_list.pop(0)      lock.release()      time.sleep(2)Producer().start()Producer().start()Consumer().start()Producer().start()Producer().start()Consumer().start()Consumer().start()

這里使用多個生產(chǎn)者和消費者，共同操作緩沖池，部分執(zhí)行結(jié)果如下：

:::Producer put: 78
!--product still in list, wait consumer to get it..
:::Consumer fetch: 78
:::Producer put: 99
!--product still in list, wait consumer to get it..
:::Consumer fetch: 99
!--No product now, wait producer put in...
:::Producer put: 12
:::Consumer fetch: 12
:::Producer put: 91
!--product still in list, wait consumer to get it..
!--product still in list, wait consumer to get it..
:::Consumer fetch: 91
!--No product now, wait producer put in...
:::Producer put: 63
:::Consumer fetch: 63
:::Producer put: 85
!--product still in list, wait consumer to get it..
!--product still in list, wait consumer to get it..
:::Consumer fetch: 85
!--No product now, wait producer put in...
:::Producer put: 1
:::Consumer fetch: 1
:::Producer put: 26
!--product still in list, wait consumer to get it..
!--product still in list, wait consumer to get it..
:::Consumer fetch: 26
!--No product now, wait producer put in...
:::Producer put: 8
:::Consumer fetch: 8
:::Producer put: 19
!--product still in list, wait consumer to get it..
!--product still in list, wait consumer to get it..