Multi-task Implementation of Multi-periodic Synchronous Programs

  • Authors:
  • Claire Pagetti;Julien Forget;Frédéric Boniol;Mikel Cordovilla;David Lesens

  • Affiliations:
  • ONERA, Toulouse, France 31055 and IRIT/ENSEEIHT, Toulouse, France 31071;LIFL/INRIA, Villeneuve d'Ascq, France 59650;ONERA, Toulouse, France 31055;ONERA, Toulouse, France 31055;EADS Astrium Space Transportation, Les Mureaux, France 78133

  • Venue:
  • Discrete Event Dynamic Systems
  • Year:
  • 2011

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Abstract

This article presents a complete scheme for the integration and the development of multi-periodic critical embedded systems. A system is formally specified as a modular and hierarchical assembly of several locally mono-periodic synchronous functions into a globally multi-periodic synchronous system. To support this, we introduce a real-time software architecture description language, named Prelude, which is built upon the synchronous languages and which provides a high level of abstraction for describing the functional and the real-time architecture of a multi-periodic control system. A program is translated into a set of real-time tasks that can be executed on a monoprocessor real-time platform with an on-line priority-based scheduler such as Deadline-Monotonic or Earliest-Deadline-First. The compilation is formally proved correct, meaning that the generated code respects the real-time semantics of the original program (respect of periods, deadlines, release dates and precedences) as well as its functional semantics (respect of variable consumption).