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New article in Science of Computer Programming magazine

By eric.verhulst - Posted on 20 October 2020

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Hubs for VirtuosoNext: Online Verification of Real-Time Coordinators

The paper is a collaborative effort of: Guillermina Cledoua (a), José Proença (b), Bernhard H.C. Sputh (c), Eric Verhulst (c)

(a)HASLab/INESC TEC, Universidade do Minho, Portugal, (b)CISTER, ISEP, Portugal, (c)Altreonic NV, Belgium

Extended version at
Esevier paper at


VirtuosoNextTM is a distributed real-time operating system (RTOS) fea- turing a generic programming model dubbed Interacting Entities. This pa- per focuses on these interactions, implemented as so-called Hubs. Hubs act as synchronisation and communication mechanisms between the application tasks and implement the services provided by the kernel. While the kernel provides the most basic services, each carefully designed, tested and opti- mised, tasks are limited to this handful of basic hubs, leaving the development of more complex mechanisms up to application specific implementations.

This work presents a toolset that supports the building of new services compositionally, using notions borrowed from the Reo coordination language, on which the developer can delegate coordination-related duties. This toolset uses a formal compositional semantics for hubs that captures dataflow and time, formalising the behaviour of existing hubs, and allowing the defini- tion of new ones. Furthermore, it enables the analysis and verification of hubs under our automata interpretation, including time-sensitive behaviour via the Uppaal model checker, usable on We illustrate the proposed tools and methods by verifying key properties on different interaction scenarios between tasks and a composed hub.



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