9 Search Results for "Edwards, Stephen A."

Document
DOI: 10.4230/LITES-v002-i002-a001
From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation

Authors: Thomas Carle, Dumitru Potop-Butucaru, Yves Sorel, and David Lesens

Published in: LITES, Volume 2, Issue 2 (2015). Leibniz Transactions on Embedded Systems, Volume 2, Issue 2

Abstract
Our objective is to facilitate the development of complex time-triggered systems by automating the allocation and scheduling steps. We show that full automation is possible while taking into account the elements of complexity needed by a complex embedded control system. More precisely, we consider deterministic functional specifications provided (as often in an industrial setting) by means of synchronous data-flow models with multiple modes and multiple relative periods. We first extend this functional model with an original real-time characterization that takes advantage of our time-triggered framework to provide a simpler representation of complex end-to-end flow requirements. We also extend our specifications with additional non-functional properties specifying partitioning, allocation, and preemptability constraints. Then, we provide novel algorithms for the off-line scheduling of these extended specifications onto partitioned time-triggered architectures à la ARINC 653. The main originality of our work is that it takes into account at the same time multiple complexity elements: various types of non-functional properties (real-time, partitioning, allocation, preemptability) and functional specifications with conditional execution and multiple modes. Allocation of time slots/windows to partitions can be fully or partially provided, or synthesized by our tool. Our algorithms allow the automatic allocation and scheduling onto multi-processor (distributed) systems with a global time base, taking into account communication costs. We demonstrate our technique on a model of space flight software system with strong real-time determinism requirements.
Cite as

Thomas Carle, Dumitru Potop-Butucaru, Yves Sorel, and David Lesens. From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation. In LITES, Volume 2, Issue 2 (2015). Leibniz Transactions on Embedded Systems, Volume 2, Issue 2, pp. 01:1-01:30, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2015)

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@Article{carle_et_al:LITES-v002-i002-a001,
  author =	{Carle, Thomas and Potop-Butucaru, Dumitru and Sorel, Yves and Lesens, David},
  title =	{{From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation}},
  journal =	{Leibniz Transactions on Embedded Systems},
  pages =	{01:1--01:30},
  ISSN =	{2199-2002},
  year =	{2015},
  volume =	{2},
  number =	{2},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LITES-v002-i002-a001},
  doi =		{10.4230/LITES-v002-i002-a001},
  annote =	{Keywords: Time-triggered, Off-line real-time scheduling, Temporal partitioning}
}
Document
DOI: 10.4230/DagRep.3.11.117
Synchronous Programming (Dagstuhl Seminar 13471)

Authors: Stephen A. Edwards, Alain Girault, and Klaus Schneider

Published in: Dagstuhl Reports, Volume 3, Issue 11 (2014)

Abstract
Synchronous programming languages are programming languages with an abstract (logical) notion of time: The execution of such programs is divided into discrete reaction steps, and in each of these reactions steps, the program reads new inputs and reacts by computing corresponding outputs of the considered reaction step. The programs are called synchronous because all outputs are computed together in zero time within a step and because parallel components synchronize their reaction steps by the semantics of the languages. For this reason, the synchronous composition is deterministic, which is a great advantage concerning predictability, verification of system design, and embedded code generation. Starting with the definition of the classic synchronous languages Esterel, Lustre and Signal in the late 1980's, the research during the past 20 years was very fruitful and lead to new languages, compilation techniques, software and hardware architectures, as well as extensions, transformations, and interfaces to other models of computations, in particular to asynchronous and hybrid systems. This report is a summary of the Dagstuhl Seminar 13471 "Synchronous Programming", which took place during November 18-22, 2013, and which was the 20th edition of the yearly workshop of the synchronous programming community. The report contains the abstracts of the presentations given during the seminar in addition to the documents provided by the participants on the web pages of the seminar.
Cite as

Stephen A. Edwards, Alain Girault, and Klaus Schneider. Synchronous Programming (Dagstuhl Seminar 13471). In Dagstuhl Reports, Volume 3, Issue 11, pp. 117-143, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2014)

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@Article{edwards_et_al:DagRep.3.11.117,
  author =	{Edwards, Stephen A. and Girault, Alain and Schneider, Klaus},
  title =	{{Synchronous Programming (Dagstuhl Seminar 13471)}},
  pages =	{117--143},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2014},
  volume =	{3},
  number =	{11},
  editor =	{Edwards, Stephen A. and Girault, Alain and Schneider, Klaus},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.3.11.117},
  URN =		{urn:nbn:de:0030-drops-44395},
  doi =		{10.4230/DagRep.3.11.117},
  annote =	{Keywords: Synchronous Languages, Hybrid Systems, Formal Verification, Models of Computation, WCET-Analysis, Embedded Systems}
}
Document
DOI: 10.4230/DagSemProc.09481.1
09481 Abstracts Collection – SYNCHRON 2009

Authors: Albert Benveniste, Stephen A. Edwards, Edward Lee, Klaus Schneider, and Reinhard von Hanxleden

Published in: Dagstuhl Seminar Proceedings, Volume 9481, SYNCHRON 2009

Abstract
The 16th SYNCHRON workshop has been organized as Dagstuhl seminar 09481 from November 22-27, 2009. Online material of the seminar is available at the following web page: http://www.dagstuhl.de/de/programm/kalender/semhp/?semnr=09481
Cite as

Albert Benveniste, Stephen A. Edwards, Edward Lee, Klaus Schneider, and Reinhard von Hanxleden. 09481 Abstracts Collection – SYNCHRON 2009. In SYNCHRON 2009. Dagstuhl Seminar Proceedings, Volume 9481, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)

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@InProceedings{benveniste_et_al:DagSemProc.09481.1,
  author =	{Benveniste, Albert and Edwards, Stephen A. and Lee, Edward and Schneider, Klaus and von Hanxleden, Reinhard},
  title =	{{09481 Abstracts Collection – SYNCHRON 2009}},
  booktitle =	{SYNCHRON 2009},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9481},
  editor =	{Albert Benveniste and Stephen A. Edwards and Edward Lee and Klaus Schneider and Reinhard von Hanxleden},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09481.1},
  URN =		{urn:nbn:de:0030-drops-24340},
  doi =		{10.4230/DagSemProc.09481.1},
  annote =	{Keywords: Synchronous languages, Safety-critical real-time systems, Model-based design, Discrete and hybrid systems, Combining synchronous and asynchronous models, Formally consistent subsetting of UML, High-level hardware modeling and synthesis, Compilation and code synthesis for embedded systems}
}
Document
DOI: 10.4230/DagSemProc.04491.1
04491 Abstracts Collection – Synchronous Programming - SYNCHRON'04

Authors: Stephen A. Edwards, Nicholas Halbwachs, Reinhard von Hanxleden, and Thomas Stauner

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
From 28.11.04 to 03.12.04, the Dagstuhl Seminar Perspectives Workshop 04491 ``Synchronous Programming - SYNCHRON'04'' was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Stephen A. Edwards, Nicholas Halbwachs, Reinhard von Hanxleden, and Thomas Stauner. 04491 Abstracts Collection – Synchronous Programming - SYNCHRON'04. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-14, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{edwards_et_al:DagSemProc.04491.1,
  author =	{Edwards, Stephen A. and Halbwachs, Nicholas and von Hanxleden, Reinhard and Stauner, Thomas},
  title =	{{04491 Abstracts Collection – Synchronous Programming - SYNCHRON'04}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--14},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.1},
  URN =		{urn:nbn:de:0030-drops-1961},
  doi =		{10.4230/DagSemProc.04491.1},
  annote =	{Keywords: Synchronous languages , executive summary , Esterel , Lustre , Signal , semantics , programming languages , real-time systems}
}
Document
DOI: 10.4230/DagSemProc.04491.2
04491 Executive Summary – Synchronous Programming - SYNCHRON'04

Authors: Stephen A. Edwards, Nicholas Halbwachs, Reinhard von Hanxleden, and Thomas Stauner

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
This seminar was the 11th in a series of semi-annual workshops on the Synchronous Languages (Esterel, Lustre, and Signal). These languages were invented in the early 1980's to make the programming of reactive systems easier. The goal of the seminar was to bring together researchers and practitioners of synchronous programming, and furthermore to reach out to relevant related areas and industrial users.
Cite as

Stephen A. Edwards, Nicholas Halbwachs, Reinhard von Hanxleden, and Thomas Stauner. 04491 Executive Summary – Synchronous Programming - SYNCHRON'04. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-7, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{edwards_et_al:DagSemProc.04491.2,
  author =	{Edwards, Stephen A. and Halbwachs, Nicholas and von Hanxleden, Reinhard and Stauner, Thomas},
  title =	{{04491 Executive Summary – Synchronous Programming - SYNCHRON'04}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--7},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.2},
  URN =		{urn:nbn:de:0030-drops-1959},
  doi =		{10.4230/DagSemProc.04491.2},
  annote =	{Keywords: Synchronous languages , executive summary , Esterel , Lustre , signal , semantics , programming languages , real-time systems}
}
Document
DOI: 10.4230/DagSemProc.04491.3
Accessing Databases within Esterel

Authors: David White and Gerald Luettgen

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
A current limitation of the Esterel language for reactive-systems design is its lack of support for accessing databases. This talk presents the results of a summer student project which investigated a way of integrating databases and Esterel by providing an API for database use inside Esterel. A case study, involving a warehouse storage system built using Lego Mindstorms robotics kits, demonstrates the utility of the API. This system employs an Esterel-programmed robot whose task it is to collect various items from a customer's order and assemble them in one place. To do so, the robot accesses customer-order data and floor-plan data stored in a database.
Cite as

David White and Gerald Luettgen. Accessing Databases within Esterel. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-21, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{white_et_al:DagSemProc.04491.3,
  author =	{White, David and Luettgen, Gerald},
  title =	{{Accessing Databases within Esterel}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--21},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.3},
  URN =		{urn:nbn:de:0030-drops-1619},
  doi =		{10.4230/DagSemProc.04491.3},
  annote =	{Keywords: database esterel lego mindstorms}
}
Document
DOI: 10.4230/DagSemProc.04491.4
Removing Cycles in Esterel Programs

Authors: Jan Lukoschus and Reinhard von Hanxleden

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
Programs written in the synchronous programming language Esterel may contain statically cyclic dependencies of signals, which inhibits the application of certain compilation approaches that rely on static scheduling. This talk proposes an algorithm which, given a constructive synchronous program, performs a semantics-preserving source-level code transformation that removes cyclic signal dependencies. The transformation exploits the monotonicity of constructive programs, and is illustrated in the context of Esterel, but should be applicable to other synchronous languages as well.
Cite as

Jan Lukoschus and Reinhard von Hanxleden. Removing Cycles in Esterel Programs. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-27, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{lukoschus_et_al:DagSemProc.04491.4,
  author =	{Lukoschus, Jan and von Hanxleden, Reinhard},
  title =	{{Removing Cycles in Esterel Programs}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--27},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.4},
  URN =		{urn:nbn:de:0030-drops-1606},
  doi =		{10.4230/DagSemProc.04491.4},
  annote =	{Keywords: Synchronous Languages , compilation , cyclic circuits , constructiveness , Esterel}
}
Document
DOI: 10.4230/DagSemProc.04491.5
SHIM: A Language for Hardware/Software Integration

Authors: Stephen A. Edwards

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
Virtually every system designed today is an amalgam of hardware and software. Unfortunately, software and circuits that communicate across the hardware/software boundary are tedious and error-prone to create. This suggests a more automatic way to synthesize them. I present the SHIM language, which combines imperative C-like semantics for software and RTL-like semantics for hardware to allow a unified description of hardware/software systems. Hardware processes and software functions communicate through shared variables, hardware for which is automatically synthesized by the SHIM compiler, which generates C and synthesizable VHDL. I demonstrate the effectiveness of the language by re-implementing an I2C bus controller. The SHIM source is half the size of an equivalent manual implementation, slightly faster, and has a smaller memory footprint. Partial and complete hardware implementations in SHIM are also presented, showing that SHIM is succinct and effective.
Cite as

Stephen A. Edwards. SHIM: A Language for Hardware/Software Integration. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-6, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{edwards:DagSemProc.04491.5,
  author =	{Edwards, Stephen A.},
  title =	{{SHIM: A Language for Hardware/Software Integration}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.5},
  URN =		{urn:nbn:de:0030-drops-1580},
  doi =		{10.4230/DagSemProc.04491.5},
  annote =	{Keywords: Hardware/software codesign , synchronous , asynchronous , language design , integration}
}
Document
DOI: 10.4230/DagSemProc.04491.6
The Kiel Esterel Processor - A Semi-Custom, Configurable Reactive Processor

Authors: Xin Li and Reinhard von Hanxleden

Published in: Dagstuhl Seminar Proceedings, Volume 4491, Synchronous Programming - SYNCHRON'04 (2005)

Abstract
The synchronous language Esterel is an established language for developing reactive systems. It gives an abstract, well-defined and executable description of the application, and can be synthesized into hardware and software. Typically, an Esterel program is first translated into other, lower-level languages (such as VHDL or C), and then compiled further. However, there is also the alternative of executing Esterel-like instructions directly. For example, in the REFLIX and RePIC projects, Roop et al.\ have augmented traditional processors with custom hardware to execute Esterel instructions. This patch strategy is a convenient approach, but has some shortages. We present the Kiel Esterel Processor (KEP), a semi-custom, configurable reactive processor for the direct execution of Esterel programs. It consists of a reactive core and scalable peripheral elements. KEP supports standard Esterel statements directly, except (so far) for the concurrency operator. Valued signals and counter functions in Esterel statements are supported by KEP. Due to its control path and its cooperation with elements, KEP obeys exact Esterel (preemption and priority) rules, including for example abort/weak abort (nests).
Cite as

Xin Li and Reinhard von Hanxleden. The Kiel Esterel Processor - A Semi-Custom, Configurable Reactive Processor. In Synchronous Programming - SYNCHRON'04. Dagstuhl Seminar Proceedings, Volume 4491, pp. 1-16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2005)

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@InProceedings{li_et_al:DagSemProc.04491.6,
  author =	{Li, Xin and von Hanxleden, Reinhard},
  title =	{{The Kiel Esterel Processor - A Semi-Custom, Configurable Reactive Processor}},
  booktitle =	{Synchronous Programming - SYNCHRON'04},
  pages =	{1--16},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4491},
  editor =	{Stephen A. Edwards and Nicolas Halbwachs and Reinhard v. Hanxleden and Thomas Stauner},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04491.6},
  URN =		{urn:nbn:de:0030-drops-1597},
  doi =		{10.4230/DagSemProc.04491.6},
  annote =	{Keywords: Esterel , synchronous languages , reactive programming , ASIPs}
}
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