Verification and Scheduling Techniques for Real-Time by Luis Alejandro Cortes

By Luis Alejandro Cortes

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Extra resources for Verification and Scheduling Techniques for Real-Time Embedded Systems (Linkoping studies in science and technology)

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SOLAR is the underlying model of the COSMOS design environment [IAJ94]. Interacting Processes are also derived from CSP and consist of independent interacting sequential processes [TAS93]. The communication is performed through channels but, unlike CSP, there exist additional primitives that permit unbuffered transfer and synchronization without data. The Formal System Design (ForSyDe) methodology [SJ04] uses a design representation where the system is modeled as network of concurrent processes which communicate with each other through signals (ordered sequences of events).

2 Temporal Logics A temporal logic is a logic augmented with temporal modal operators which allow reasoning about how the truth of assertions changes over time [KG99]. Temporal logics are usually employed to specify desired properties of systems. There are different forms of temporal logics depending on the underlying model of time. In this subsection, we focus on CTL (Computation Tree Logic) because it is a representative example of temporal logics and it is one that we use in our verification approach.

6 Two transitions T and T are in conflict if ◦ T ∩ ◦ T = ∅. 7 A net N is conflict-free if, for all T, T ∈ T such that T = T , ◦ T ∩ ◦ T = ∅. 8 A net N is free-choice if, for any two transitions T and T in conflict, |◦ T | = |◦ T | = 1. 9 A net N is extended free-choice if, for any two transitions T and T in conflict, ◦ T = ◦ T . 10 A net N is safe if the number of tokens in each place, for any reachable marking, is at most one. 11 A net N is live if, for every reachable marking M ∈ R(N ) and every transition T ∈ T, there exists a marking M reachable from M that enables T .

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