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The paper introduces a new reusable asynchronous component, called WAITX element, that arbitrates between two requests. In contrast to the traditional mutex, the requests are not required to be persistent, i.e. can be withdrawn at any moment, have hazards or even have high-frequency bursts, e.g. they can be outputs of voltage comparators. It is guaranteed that (i) hazards will never propagate past...
Petri nets with read arcs are investigated w.r.t their unfolding, where read arcs model reading without consuming, which is often more adequate than the destructive-read-and-rewrite modelled with loops in ordinary nets. The paper redefines the concepts of a branching process and unfolding for nets with read arcs and proves that the set of reachable markings of a net is completely represented by its...
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