6.1.3 Resource Allocation Graphs(2/4) Directed graph(有向图) that depicts(表述)a state of the system of resources and processes Reguests Held by Ra P1 R (a)Resouce is requested (b)Resource is held An intance of the resource6.1.3 Resource Allocation Graphs(2/4) • Directed graph(有向图) that depicts(表述) a state of the system of resources and processes 20 An intance of the resource