Python实现的多线程同步与互斥锁功能示例

#! /usr/bin/env python
#coding=utf-8
import threading
import time
'''
#1、不加锁
num = 0
class MyThread(threading.Thread):
  def run(self):
    global num
    time.sleep(1) #一定要sleep！！！
    num = num + 1
    msg = self.name + ' num is ---- ' + str(num)
    print msg
def test():
  for i in range(10):
    s = MyThread() #实例化一个Thread对象，每个Thread对象代表着一个线程
    s.start() #通过start()方法，开始线程活动
'''
#'''
class MyThread(threading.Thread):
  def run(self):
    for i in range(3):
      time.sleep(1)
      msg = self.name+' @ '+str(i)
      print msg
def test():
  for i in range(5):
    t = MyThread()
    t.start()
#'''
'''
#2、加锁
num = 0 #多个线程共享操作的数据
mu = threading.Lock() #创建一个锁
class MyThread(threading.Thread):
  def run(self):
    global num
    time.sleep(1)
    if mu.acquire(True): #获取锁状态，一个线程有锁时，别的线程只能在外面等着
      num = num + 1
      msg = self.name + ' num is ---- ' + str(num)
      print msg
      mu.release() #释放锁
def test():
  for i in range(10):
    s = MyThread()
    s.start()
'''
if __name__ == '__main__':
  test()