BIB-VERSION:: CS-TR-v2.0
          ID:: STAN//CS-TR-75-501
       ENTRY:: August 23, 1995
ORGANIZATION:: Stanford University, Department of Computer Science
       TITLE:: Procedural events as software interrupts.
        TYPE:: Technical Report
      AUTHOR:: Pettersen, Odd
        DATE:: June 1975
       PAGES:: 9
    ABSTRACT:: The paper deals with procedural events, providing a basis for
               synchronization and scheduling, particularly applied on
               real-time program systems of multiple parallel activities
               ("multi-task").

               There is a great need for convenient scheduling mechanisms
               for minicomputer systems as used in process control, but so
               far mechanisms somewhat similar to those proposed here are
               found only in PL/I among the generally known high-level
               languages. PL/I, however, is not very common on computers of
               this size. Also, the mechanisms in PL/I seem more restricted,
               as campared to those proposed here.

               A new type of boolean program variable, the EVENTMARK, is
               proposed. Eventmarks represent events of any kind that may
               occur within a computational process and are believed to give
               very efficient and convenient activation and scheduling of
               program modules in a real-time system. An eventmark is
               declared similar to a procedure, and the proposed feature
               could easily be amended as an extension to existing
               languages, as well as incorporated in future language
               designs.
       NOTES:: [Adminitrivia V1/Prg/19950823]
         END:: STAN//CS-TR-75-501