Application-defined scheduling in Ada

  • Authors:
  • Mario Aldea Rivas;Michael González Harbour

  • Affiliations:
  • Universidad de Cantabria, Santander, Spain;Universidad de Cantabria, Santander, Spain

  • Venue:
  • IRTAW '03 Proceedings of the 12th international workshop on Real-time Ada
  • Year:
  • 2003

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Abstract

This paper is a proposal for an application program interface (API) that would enable Ada applications to use application-defined scheduling algorithms in a way compatible with the scheduling model of the Ada 95 Real-Time Systems Annex. With this API, several application-defined schedulers, implemented by extending a tagged type, can coexist in the system in a predictable way together with their scheduled tasks, and with regular fixed priority tasks directly scheduled by the run-time system. Task synchronization through protected objects is also considered by adding the Stack Resource Policy, which can be used in a large variety of fixed and dynamic priority scheduling policies.