python中Event怎么实现线程间同步

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前言：

Event在python线程间同步是一种常用的方法，本文以生产者线程和工作者线程为例说明Event在线程间进行10次同步的应用。

import threading
from threading import Event, Thread
import time
import random
from time import sleep

pevent = Event() #默认是没有事件的
pevent.clear()

cevent = Event()
cevent.clear()

runtimes = 10
mutex_lock = threading.Lock()


class ProducerThread (threading.Thread):
def __init__(self, name, runflag):
threading.Thread.__init__(self)
self.name = name
self.runflag = runflag
self.continueflag = Event()
self.continueflag.set()

def run(self):
global runtimes
sleep(1)
print ("开始线程：" + self.name)
while self.continueflag.isSet():
print("wait consumer ...")
if runtimes == 0:
self.continueflag.clear()
break
pevent.wait()
print("come an consumer ...")
mutex_lock.acquire()
runtimes = runtimes - 1
mutex_lock.release()
pevent.clear()
sleep(1)
cevent.set()
print ("退出线程：" + self.name)
self.runflag.set()

class ConsumerThread (threading.Thread):
def __init__(self,name, runflag):
threading.Thread.__init__(self)
self.name = name
self.runflag = runflag
self.continueflag = Event()
self.continueflag.set()

def run(self):
global runtimes
print ("开始线程：" + self.name)
while self.continueflag.isSet():
if 0 == runtimes:
self.continueflag.clear()
pevent.set()
break
print("I want to consum ... ", runtimes)
pevent.set() #通知生产者要消费
cevent.wait()
cevent.clear()
sleep(1)
print ("退出线程：" + self.name)
self.runflag.set()

def test_pthread():
runflag = Event()
pt = ProducerThread("producer", runflag)
ct = ConsumerThread("consumer", runflag)
pt.start()
ct.start()
pt.join()
ct.join()
runflag.wait()

if __name__ == '__main__':
print('===============begin=================')
test_pthread()
print('===============end=================')

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