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A collection of basic ideas is presented, which have been evolved by various workers over the past four years to provide a suitable framework for the design and analysis of multiprocessing systems. The notions of process and state vector are discussed, and the nature of basic operations on processes is considered. Some of the connections between processes and protection are analyzed. A very general approach to priorityoriented scheduling is described, and its relationship to conventional interrupt systems is explained. Some aspects of time-oriented scheduling are considered. The implementation of the scheduling mechanism is analyzed in detail and the feasibility of embodying it in hardware established. Finally, several methods for interlocking the execution of independcrt processes are presented and compared.
Butler Lampson (Wed,) studied this question.