# -*- coding: utf-8 -*-
import time
import threading
# 创建锁对象
lock = threading.Lock()
num = 0
 
def run(n):
    global num
    for i in range(10):
        # 加锁  为了确保下面代码只能由一个线程从头到尾的执行
        # 会阻止多线程的并发执行，所以效率会大大降低
        with lock:
            time.sleep(2)
            print("start")
            num = num + 1
            print(f"======{n}========")
 
 
if __name__ == '__main__':
    t1 = threading.Thread(target=run,args=(6,))
    t2 = threading.Thread(target=run,args=(9,))
    t1.start()
    t2.start()
    t1.join()
    t2.join()
    print("num = %s"%(num))