1 import threading
 2 import time
 3 globals_num = 0
 4 lock = threading.RLock()
 5 def func():
 6     lock.acquire()#获得锁
 7     global globals_num
 8     globals_num += 1
 9     time.sleep(1)
10     print(globals_num)
11     lock.release()#释放锁
12 
13 for i in range(10):
14     t = threading.Thread(target=func)
15     t.start()