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.
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