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How to integrate precedence constraints and shared resources in real-time scheduling

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2 Author(s)
Spuri, M. ; Scuola Superiore S. Anna, Pisa, Italy ; Stankovic, J.A.

Formal results for precedence constrained, real-time scheduling of unit time tasks are extended to arbitrary timed tasks with preemption. An exact characterisation of the EDF-like schedulers that can be used to transparently enforce precedence constraints among tasks is shown. These extended results are then integrated with a well-known protocol that handles real-time scheduling of tasks with shared resources, but does not consider precedence constraints. This results in schedulability formulas for task sets which allow preemption, shared resources, and precedence constraints, and a practical algorithm for many real-time uniprocessor systems

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Computers, IEEE Transactions on  (Volume:43 ,  Issue: 12 )