"The paper describes the design philosophy of HYDRA - the kernel of an operating system for C.mmp, the Carnegie-Mellon Multi-Mini-Processor. This philosophy is realized through the introduction of a generalized notion of 'resource', both physical and virtual, called an 'object'. Mechanisms are presented for dealing with objects, including the creation of new types, specification of new operations applicable to a given type, sharing, and protection of any reference to a given object against improper application of any of the operations defined with respect to that type of object. The mechanisms provide a coherent basis for extension of the system in two directions: the introduction of new facilities, and the creation of highly secure systems. (Author)."@en . . . . . . . . . . . . "HYDRA kernel"@en . . . . . "HYDRA: The Kernel of a Multiprocessor Operating System"@en . . . . "Hydra : the kernel of a multiprocessor operating system" . . . . . . . . . "HYDRA -- the kernel of a multiprocessor operating system"@en . . . . "Computer Hardware." . . "CARNEGIE-MELLON UNIV PITTSBURGH PA Dept. of COMPUTER SCIENCE." . . "Multiple operation." . . "Computer Programming and Software." . . "Computer programming." . . "Data processing." . .