Volume

Dagstuhl Seminar Proceedings, Volume 4491

Publication Details

  • published at: 2005-06-30
  • Publisher: Schloss Dagstuhl – Leibniz-Zentrum für Informatik

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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

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.
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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

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

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.
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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

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

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

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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  • Authors
  • E
  • Edwards, Stephen A.
  • H
  • Halbwachs, Nicholas
  • L
  • Li, Xin
  • Luettgen, Gerald
  • Lukoschus, Jan
  • S
  • Stauner, Thomas
  • V
  • von Hanxleden, Reinhard
  • W
  • White, David

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