锁机制实现

import threading
import time 

def (cond,name):
	cond.acquire() # 申请
	print(name+" I am run1,1")
	cond.notify() # 唤起run2_1
	cond.wait() # 阻塞本线程


	print(name+"I am run1,2")
	cond.notify() #唤起run2_2
	cond.wait()

def run2(coda,name):
	cond.acquire() # 申请
	print(name+" I am run2,1")
	cond.notify() # 唤起run1_2
	cond.wait()	# 阻塞本线程

	print(name+"I am run2,2")
	cond.notify()
	cond.release()

cond = threading.Condition()
t1 = threading.Thread(target=run1,args=(cond,"xiaoyi",))
t2 = threading.Thread(target=run2,args=(cond,"xiaohuang"))
t1.start()
t2.start()
t1.join()
t2.join()