初步测试通过可用的版本 | available edition after preliminary testing

特征

1. 锁是可重入的
2. 线程释放锁之前保释redis服务器锁不过期
3. 以较低的性能消耗维护锁状态的更新

feature

1. lock is reentrant
2. it keep lock not released before thread unlock
3. low performance consumption