关于python3互斥锁

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import threading
from threading import Thread
from threading import Lock
import time

num = 0

两个线程都抢着上锁,如果有一方上锁以后,就会导致一直阻塞,直到这个锁被解开为止

class Thread(threading.Thread):
def run(self):
mutex.acquire()
for i in range(10000):
   global num
   num += 1
print(num)
mutex.release()

def test():
   global num
   mutex.acquire() # 等待可以上锁，通知而不是轮训，没有占用CPU
   for i in range(10000):
      num += 1
   print(num)
   mutex.release() # 解锁

mutex = Lock()

if  __name___ ==  ‘__main__’:
t = MyThread()
t.start()

创建一把互斥锁，默认是没有上锁的

thread = Thread(target=test)
thread.start()