python信号量机制

import threading
import time

localtime = time.asctime( time.localtime(time.time()) )

def (single):
	print("Recently time is %s"%localtime)
	single.wait() # 设置信号量为False

single = threading.Event() # 定义事件

for x in range(3):
	# 创建三个线程
	t = threading.Thread(target=run,args=(single,))
	t.start()
	time.sleep(1)
	single.set() # 设置信号量为True