在线程间共享多个资源的时候,如果两个线程分别占有一部分资源并且同时等待对方的资源,就会造成死锁
import threading
import time
class MyThread1(threading.Thread):
def run(self):
# 对mutexA上锁
mutexA.acquire()
# mutexA上锁后,延时1秒,等待另外那个线程 把mutexB上锁
print(self.name+'----do1---up----')
time.sleep(1)
# 此时会堵塞,因为这个mutexB已经被另外的线程抢先上锁了
mutexB.acquire()
print(self.name+'----do1---down----')
mutexB.release()
# 对mutexA解锁
mutexA.release()
class MyThread2(threading.Thread):
def run(self):
# 对mutexB上锁
mutexB.acquire()
# mutexB上锁后,延时1秒,等待另外那个线程 把mutexA上锁
print(self.name+'----do2---up----')
time.sleep(1)
# 此时会堵塞,因为这个mutexA已经被另外的线程抢先上锁了
mutexA.acquire()
print(self.name+'----do2---down----')
mutexA.release()
# 对mutexB解锁
mutexB.release()
mutexA = threading.Lock()
mutexB = threading.Lock()
if __name__ == '__main__':
t1 = MyThread1()
t2 = MyThread2()
t1.start()
t2.start()