多个进程同时运行时，系统根据各类系统资源的最大需求和各类系统的剩余资源为进程安排安全序列，使得系统能快速且安全地运行进程，不至发生死锁。银行家算法是避免死锁的主要方法-Multiple processes running at the same time, the greatest demand for various types of system resources and the remaining resources of the various systems arranged for process safety sequence, so that the system can be quickly and safely run the process, not to deadlock. The banker algorithm is the main way to avoid deadlock