模拟银行家算法，检测死锁。当用户申请一组资源时，系统必须确定这些资源的分配是否仍会使系统处于安全状态。如果会，就可分配资源；否则，进程必须等待直到某个其他进程释放足够资源为止。-It is on simulating banker arithmetic and detecting death lock. When user applies a group of resource, the system must decide if assigning the source still keep