By by Traian Pop.

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4 Thesis Contributions The studies covered in this thesis consider distributed embedded systems implemented with heterogeneous, event-triggered and time-triggered task sets, which communicate over bus protocols consisting of both static and dynamic phases. We have considered that the time-triggered activities are executed according to a static cyclic schedule, while the event-triggered activities follow a fixed priority scheduling or an EDF scheduling policy, which is preemptive for the execution of tasks and non-preemptive for the transmission of messages.

FPS and EDF tasks) and messages. However, there exist two important differences. First, messages do not preempt each other, therefore, in the demand equation the blocking term will be non-zero, but equal with the largest transmission time of any ET message. Second, the availability for a message is computed by substracting from t the length of the ST slots which appear during the considered interval; moreover, because an ET message will not be sent unless there is enough time before the current dynamic phase ends, the availability is further decreased with CA for each dynamic phase in the busy window (where CA is the transmission time of the longest ET message).

4: Availability and Demand • The interference from the set of statically scheduled tasks. • The characteristics of the communication protocol, which influence the worst case delays induced by the messages communicated on the bus. First, we extend the notions of ET availability and demand introduced in [Ped00] for analysing heterogeneous ST/DYN communication protocols. Our extension applies the same concepts to task execution. We start by defining the ET demand for an FPS or EDF activity τij over a time interval t as the maximum amount of CPU time or bus time which can be demanded by higher or equal priority ET activities and by τij during the time interval t.

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