An operating system based on the concept of a supervisory computer

ABSTRACT

This paper appears in the March, 1972, issue of the Communications of the ACM. Its abstract is reproduced below. An operating system which is organized as a small supervisor and a set of independent processes are described. The supervisor handles I/O with external devices - the file and directory system - schedules active processes and manages memory, handles errors, and provides a small set of primitive functions which it will execute for a process. A process is able to specify a request for a complicated action on the part of the supervisor (usually a wait on the occurrence of a compound event in the system) by combining these primitives into a “supervisory computer program.” The part of the supervisor which executes these programs may be viewed as a software implemented “supervisory computer.” The paper develops these concepts in detail, outlines the remainder of the supervisor, and discusses some of the advantages of this approach.

INDEX TERMS

Primary Classification:
  D. Software
  D.4 OPERATING SYSTEMS

Additional Classification:
  D. Software
  D.4 OPERATING SYSTEMS
      D.4.1 Process Management

General Terms:
Management