By Per Brinch Hansen
Communications of the ACM,
April 1970,
Vol. 13 No. 4, Pages 238-241
10.1145/362258.362278
Comments
This paper describes the philosophy and structure of a multi-programming system that can be extended with a hierarchy of operating systems to suit diverse requirements of program scheduling and resource allocation. The system nucleus simulates an environment in which program execution and input/output are handled uniformly as parallel, cooperating processes. A fundamental set of primitives allows the dynamic creation and control of a hierarchy of processes as well as the communication among them.
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