August 2009 - Haskell

Postdoc and Ph.D. position on 3gERP-project at DIKU
by Fritz Henglein 06 Aug '09

06 Aug '09

A postdoc position and a Ph.D. scholarship are available at the Department of Computer Science, University of Copenhagen (DIKU) within 3d generation enterprise resource planning systems (3gERP), a collaborative strategic research project with partners at DIKU (computer science), Copenhagen Business School (CBS, information systems) and Microsoft Development Center Copenhagen (MDCC, enterprise systems). The 3gERP Project Enterprise software accounts for more than $200 billion in annual global revenue (about 5 times the total revenue of the computer games industry) and costs 10-20 times more than the hardware it runs on. The goal of the 3gERP project is to contribute to developing theories, technologies and tools aimed at making enterprise ("ERP") systems more customizable, evolvable and affordable, specifically for small and medium-sized enterprises (SMEs). Starting the second project phase this summer the focus is on executable declarative domain-specific languages for bridging the gap from requirements to running code, specifically: • process specification languages and tools for capturing, managing, and analyzing processes such as contracts, work flows and production schedules; • reporting languages and incrementalization technology for automatic transformation of business analysis functions to operate in real time in a transactional environment; • logic-based modeling of legal rules and reasoning in the business domain; • presentation frameworks/languages for automatically generating role-tailored user interfaces from process, role and data rendering specifications; • design and implementation of a prototype ERP system based on the Process-Oriented Event-driven Transaction Systems (POETS) software architecture, which encompasses the above components. Ph.D. position We are looking for a Ph.D. student to work on • reporting languages and incrementalization technology for automatic transformation of business analysis functions to operate in real time in a transactional environment. This will include mathematical and computer science studies of incrementalization (transforming batch programs into programs that work online, updating their result continuously as new data arrive), programming of software tools, integration into a prototype enterprise system based on POETS, and real-life evaluation in SMEs in collaboration with project partners at CBS and MDCC. Postdoc position We are looking for a postdoc to work on • design and implementation of a prototype ERP system based on the Process-Oriented Event-driven Transaction Systems (POETS) software architecture, including process, reporting and rules components in collabortion with the other team members at DIKU, and • generating role-tailored user interfaces from process, role and data rendering specifications. The candidates should have solid theoretical foundations (such as in strongly typed functional programming; programming language semantics, program analysis, model checking, type systems, logic, process calculi program transformations/model-driven programming) and should preferably feel excited rather than concerned by the prospect of using and developing those foundations for constructing software with a demonstrated potential for practical utility in an application domain that constitutes an large sector of the economy. For more information please see the full position announcement at: http://www.diku.dk/~henglein/3gERP-positions.pdf Fritz Henglein henglein(a)diku.dk

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bug in language definition (strictness)
by Malcolm Wallace 06 Aug '09

06 Aug '09

It has been brought to my attention (as errata editor of the revised H'98 report) that there is a bug in the language definition, concerning strictness annotations on datatypes. In section 4.2.1, the translation of strict components of a data constructor is defined as > (\ x1 ... xn -> ( ((K op1 x1) op2 x2) ... ) opn xn) > > where opi is the non-strict apply function $ if si is of the form > ti, and opi is the strict apply function $! (see Section 6.2) if si > is of the form ! ti. Pattern matching on K is not affected by > strictness flags. > yet, because of the definition of $!, this applies the constructor to its arguments right-to-left instead of the intuitive left-to-right. All extant compilers in fact evaluate the strict fields left-to-right in violation of the Report. The same non-intuitive behaviour can be seen more clearly in the simple expression: (f $! x) $! y in which you might expect x to be evaluated before y, but in fact it is the other way round. (And here, the compilers do follow the Report.) The fix I propose for H'98 (and equally for Haskell Prime) is to change the definition of $! as follows Replace f $! x = x `seq` f x with f $! x = f `seq` x `seq` f x in section 6.2 Regards, Malcolm

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ANNOUNCE: Dyre - Dynamic Program Recompilation (Xmonad-style configuration)
by Will Donnelly 06 Aug '09

06 Aug '09

Dyre is a library for Xmonad-style program recompilation. It is based in spirit after the HConf library written by the Yi project, but with a number of key differences: 1. Focus on simple integration into existing programs. 2. A single program entry point, rather than two. 3. Emphasis on relaunching / state persistence as an *optional* feature. 4. Windows support A reasonably complete explanation, along with a full usage example, is available in the Haddock documentation for the 'Config.Dyre' module, which I unfortunately cannot link to because HackageDB has not yet processed the documentation. The library itself may be found at < http://hackage.haskell.org/package/dyre>. I eagerly await any feedback people have to offer. Thank you for your attention - Will Donnelly

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PADL 2010: Second Call for Papers
by PADL 2010 03 Aug '09

03 Aug '09

CALL FOR PAPERS Twelfth International Symposium on Practical Aspects of Declarative Languages 2010 (PADL'10) http://clip.dia.fi.upm.es/Conferences/PADL-2010 Madrid, Spain January 18-19, 2010 Co-located with ACM POPL'10 Declarative languages build on sound theoretical bases to provide attractive frameworks for application development. These languages have been successfully applied to many different real-world situations, ranging from data base management to active networks to software engineering to decision support systems. New developments in theory and implementation have opened up new application areas. At the same time, applications of declarative languages to novel problems raise numerous interesting research issues. Well-known questions include designing for scalability, language extensions for application deployment, and programming environments. Thus, applications drive the progress in the theory and implementation of declarative systems, and benefit from this progress as well. PADL is a forum for researchers and practitioners to present original work emphasizing novel applications and implementation techniques for all forms of declarative concepts, including, functional, logic, constraints, etc. Topics of interest include, but are not limited to: * Innovative applications of declarative languages. * Declarative domain-specific languages and applications. * Practical applications of theoretical results. * New language developments and their impact on applications. * Declarative languages and Software Engineering. * Evaluation of implementation techniques on practical applications. * Practical experiences and industrial applications. * Novel uses of declarative languages in the classroom. PADL'10 welcomes new ideas and approaches pertaining to applications and implementation of declarative languages. PADL'10 will be co-located with POPL 2010. IMPORTANT DATES Abstract submission: August 31, 2009 Paper Submission: September 4, 2009 Notification: October 5, 2009 Camera-ready: October 26, 2009 Symposium: January 18-19, 2010 SUBMISSION GUIDELINES Authors should submit an electronic copy of the full paper (written in English) in PDF, in the Springer LNCS format (see http://www.springer.com/computer/lncs?SGWID=0-164-7-72376-0) The submission will be done through EasyChair at the URL http://www.easychair.org/conferences/?conf=padl10 . PADL'10 will accept both technical and application papers. Technical Papers Technical papers must describe original, previously unpublished research results, and must not be simultaneously submitted for publication elsewhere. Each submission must be written in English, and include three to four keywords, which will be used to assist us in selecting appropriate reviewers for the paper. Submissions must not exceed 15 pages in Springer LNCS format. Application Papers Application papers are a mechanism to present important practical applications of declarative languages that occur in industry or in areas of research other than computer science. Application papers will be published in the Springer-Verlag conference proceedings, and will be presented in a separate session. Application papers are expected to describe complex and/or real-world applications that rely on an innovative use of declarative languages. Application descriptions, engineering solutions and real-world experiences (both positive and negative) are solicited. The limit for application papers is 3 pages in Springer LNCS format. Most Practical Paper Award The Most Practical Paper award will be given to the technical submission that is judged by the program committee to be the best in terms of practicality, originality, and clarity of presentation. The program committee may choose not to make an award, or to make multiple awards. PROGRAM COMMITTEE Program Committee Chairs Manuel Carro (Universidad Politécnica de Madrid, Spain) Ricardo Peña (Universidad Complutense de Madrid, Spain) Program Committee María Alpuente (Universidad Politécnica de Valencia, Spain) Lennart Augustson (Standard Chartered Bank and Chalmers University of Technology, Sweden) Olaf Chitil (University of Kent, UK) María García de la Banda (Monash University, Australia) Andy Gill (The University of Kansas, USA) Haifeng Guo (University of Nebraska at Omaha, USA) Martin Hofmann (Ludwig-Maximilians Universität, Germany) Andy King (Portcullis Computer Security Limited, UK) John Launchbury (Galois, USA) Rita Loogen (Philipps-Universität Marburg, Germany) Erik Meijer (Microsoft Research, UK) Enrico Pontelli (New Mexico State University, USA) Vítor Santos Costa (Universidade do Porto, Portugal) Terrance Swift (CENTRIA, Portugal) Paolo Torroni (Università di Bologna, Italy) Roland Yap (National University of Singapore, Singapore) CONTACTS: For information about papers and submissions, please contact a Program Chair: Manuel Carro PC co-Chair - PADL 2010 School of Computer Science Universidad Politécnica de Madrid Campus de Montengancedo E-28660 Boadilla del Monte, Spain Email: mcarro <AT> fi<DOT>upm<DOT>es Ricardo Peña PC co-Chair - PADL 2010 Facultad de Informática Universidad Complutense de Madrid c/ Profesor José García Santesmases s/n E-28040 Madrid, Spain Email: ricardo <AT> sip<DOT>ucm<DOT>es For other information about the conference, please contact: Manuel Carro General Chair - PADL 2010 School of Computer Science Universidad Politécnica de Madrid Campus de Montengancedo E-28660 Boadilla del Monte, Spain Email: mcarro <AT> fi<DOT>upm<DOT>.es WITH THE COOPERATION OF: The University of Texas at Dallas ACM Sigplan

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IFL 2009: Call for Papers and Participation
by IFL 2009 02 Aug '09

02 Aug '09

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ANNOUNCE: sendfile-0.5 with >2gb files and goood performance
by Matthew Elder 01 Aug '09

01 Aug '09

sendfile-0.5 -------------------------------------------------------------------------------- * Code simplification / beautification * Fixed a bug where all bytes were not sent with larger files in linux (greater than 5 mb or so) * Added large file support (> 2gb) for Linux, Win32, and Portable * The current handle position will now be ignored in favor of using an offset when using the ' variants. There is no guarantee that an input file Handle will not be mutated; only a guarantee that sendFile' and unsafeSendFile' do not care about the starting position -- they will always start from the beginning. * The portable implementation is now more reliable and memory-efficient thanks to the work done by Bardur Arantsson. * The Win32 implementation is more reliable now, as TransmitFile is now called with 'foreign import stdcall safe' once again. The FreeBSD implementation is still in need of some love but the Win32 & Linux implementations work great! Happy Hacking! Matthew Elder

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ANNOUNCE: The Haskell Platform 2009.2.0.2
by Don Stewart 01 Aug '09

01 Aug '09

We're pleased to announce the third release of the Haskell Platform: a single, standard Haskell distribution for everyone. The specification, along with installers (including Windows and Unix installers for a full Haskell environment) are available. Download the Haskell Platform 2009.2.0.2: http://hackage.haskell.org/platform/ The Haskell Platform is a single, standard Haskell distribution for every system, in the form of a blessed library and tool suite for Haskell distilled from the thousands of libraries on Hackage, along with installers for a wide variety of systems. It saves developers work picking and choosing the best Haskell libraries and tools to use for a task. When you install the Haskell Platform, you get the latest stable compiler, an expanded set of core libraries, additional development tools, and cabal-install – so you can download anything else you need from Hackage. What you get: http://hackage.haskell.org/platform/contents.html With regular time-based releases, we expect the platform will grow into a rich, indispensable development environment for all Haskell projects. Since the first release, there have been over 100,000 downloads of the installers. Thanks! -- The Platform Infrastructure Team

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