Python死锁与递归锁

 

Lock() 互斥锁会导致死锁，用RLock()递归锁代替。

递归锁：可以连续acquire多次，每acquire一次计数器+1（无论acquire的是哪个锁），只有计数为0才能被acquire

mutexB = mutexA = RLock()


class MyThread(Thread):
    def run(self):
        self.f1()
        self.f2()

    def f1(self):
        mutexA.acquire()
        print('%s 拿到了A锁'%self.name)
        mutexB.acquire()
        print('%s 拿到了B锁'%self.name)
        mutexB.release()
        mutexA.release()

    def f2(self):
        mutexB.acquire()
        print('%s 拿到了B锁'%self.name)  #递归锁计数不为0，其他线程就无法取得递归锁
        mutexA.acquire()
        print('%s 拿到了A锁'%self.name)
        mutexA.release()
        mutexB.release()


if __name__ == "__main__":
    for i in range(0, 10):
        my_thread = MyThread()
        my_thread.start()