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Parametric dispatching of hard real-time tasks

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3 Author(s)
Gerber, R. ; Dept. of Comput. Sci., Maryland Univ., College Park, MD, USA ; Pugh, William ; Saksena, M.

In many real-time systems relative timing constraints are imposed on a set of tasks. Generating a correct ordering for the tasks and deriving their proper start-time assignments is an NP-hard problem; it subsumes the non-preemptive scheduling problem. Even when the application imposes a total order on the tasks, generating proper start-times is still nontrivial if execution times may range between upper and lower bounds. We present the technique of parametric dispatching to enforce such timing constraints. During an off-line component, we check if the constraints can be guaranteed. If so, a calendar is produced that allows our on-line algorithm to generate upper and lower bounds on the start time of each task, based on the start times and execution times of previous tasks. A suitable start time for the task may then be selected taking into account the presence of other non-critical tasks in the system

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Computers, IEEE Transactions on  (Volume:44 ,  Issue: 3 )