在避免死锁的方法中，所施加的限制条件较弱，有可能获得令人满意的系统性能。在该方法中把系统的状态分为安全状态和不安全状态，只要能使系统始终都处于安全状态，便可以避免发生死锁。

银行家算法的基本思想是分配资源之前,判断系统是否是安全的 若是,才分配。它是最具有代表性的避免死锁的算法。

-In the deadlock avoidance method, the constraints imposed by weak, it is possible to obtain satisfactory system performance. In this method, the system is divided into a safe state and the state of insecurity, just to make the system always in a safe state, a deadlock can be avoided. The basic idea is that the banker' s algorithm before allocating resources to determine whether the system is safe　if, before distribution. It is the most representative of the deadlock avoidance algorithm.