This paper extends the two-level hierarchical scheme in [l] for scheduling independently developed real-time applications with non-real-time applications in an open environment. The environment allows the schedulability of each real-time application to be validated independently of other applications in the system. The extended scheme removes the following two restrictions of the scheme in [l]: (1) real-time applications that are xheduled Preemptively must consist solely of periodic tasks and (2) applications must not share global resources (i.e., resources used by more than one application). Consequently, the extended scheme can accommodate a much broader spectrum of real-time applications.
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