利用资源向量Available ，它是一个含有m个元素的数组，其中的每一个元素代表一类可利用的资源的数目，其初始值是系统中所配置的该类全部可用资源数目。其数值随该类资源的分配和回收而动态地改变。如果Available（j）=k，标是系统中现有Rj类资源k个。-Resource utilization vector Available, it is an array that contains m elements, wherein each element is representative of a class of the number of resources available, and its initial value is the number of all available resources of the system configured such. Its value is dynamically changed with the kind of resource allocation and recovery. If Available (j) = k, standard existing the Rj classes resources system of k.