May 2017 - Pharo-users - lists.pharo.org

Pharo for Raspberry Pi
by horrido May 9, 2017

May 9, 2017

I'm following Torsten's article, "Pharo Pi," to setup my new Raspberry Pi 3. The only differences are: 1) I'm using 63.zip for the VM instead of 61.zip; 2) I'm using Pharo V50 instead of V40. However, I'm getting the following error when I try to run Pharo: *This interpreter (vers. 6505) cannot read image file (vers. 6521).* Any idea what's going on? -- View this message in context: http://forum.world.st/Pharo-for-Raspberry-Pi-tp4945740.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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prespur vm for sierra
by Tudor Girba May 9, 2017

May 9, 2017

Hi, I have a demo image coming from a pre-Spur era, and I just realized that I cannot run the old VM on Sierra. Is there a version that I can use for this? Cheers, Doru -- www.tudorgirba.com www.feenk.com "It's not how it is, it is how we see it."

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Pharo Audio?
by volkert May 9, 2017

May 9, 2017

Dear all, it is possible to play some audio (wav, ogg, mp3, ...) in Pharo? - I need to play an effect on a key/mouse event... - i need to play/stream some audio file in the background ... BW, Volkert

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Editor with syntax highlighting awareness
by phil＠highoctane.be May 8, 2017

May 8, 2017

I want to do such an editor. Preferrably something fast. And in the current Pharo. There have been several text models, Rubric etc. What is the quickest way to get such a thing? Features: Load/Save content Highlight keywords based on syntax parsing Act on the element under the cursor Act on the element when (modifier)clicking on it (or hovering). Fast (or at least, not sluggish on a "normal" (ie Core i5 1.8Ghz) laptop) This is really something I miss being able to do in Pharo. Lots of code is using "STHStyler" things but there seems to be no easy way to extend that (as it seems to be using the AST or something like that). I am okay with a first easy approach to highlighting, like in Vim where one puts a syntax file with not that many things. Phil

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Re: [Pharo-users] SSL/TLS plugin initailization failed (VM plugin missing ? OS libraries missing ?)
by Ben Coman May 8, 2017

May 8, 2017

> Am 08.05.2017 13:18 schrieb "Julien Delplanque" <julien(a)tamere.eu>: > > Ok, I installed the missing library: > > yaourt -S lib32-openssl-1.0 > > now when I do: > > ldd /usr/share/pharo/vm/libSqueakSSL.so > > I get: > > /usr/share/pharo/vm/libSqueakSSL.so: /usr/lib32/libssl.so.1.0.0: version `OPENSSL_1.0.0' not found (required by /usr/share/pharo/vm/libSqueakSSL.so) > linux-gate.so.1 (0xf77f1000) > libssl.so.1.0.0 => /usr/lib32/libssl.so.1.0.0 (0xf7731000) > libc.so.6 => /usr/lib32/libc.so.6 (0xf7571000) > libcrypto.so.1.0.0 => /usr/lib32/libcrypto.so.1.0.0 (0xf7360000) > /usr/lib/ld-linux.so.2 (0x565de000) > libdl.so.2 => /usr/lib32/libdl.so.2 (0xf735b000) > > So it is still not working, I still get the exception in Pharo. :-( > > Julien > > > On Mon, May 8, 2017 at 7:36 PM, Marc Hanisch via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > ---------- Forwarded message ---------- > From: Marc Hanisch <marc.hanisch(a)googlemail.com> > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > Cc: > Bcc: > Date: Mon, 8 May 2017 13:36:12 +0200 > Subject: Re: [Pharo-users] SSL/TLS plugin initailization failed (VM plugin missing ? OS libraries missing ?) > Hello, > I have the same problem on Ubuntu 16.04 and Fedora 25... > > Any hints? Just a random skim of the web for similar errors... Install lib32-openssl-1.0-compat or similar... https://forum.manjaro.org/t/unstable-update-2017-05-02-plasma5-gnome-virtua… Maybe something to do with systemvariables and the installation of two versions of the libraries (32 & 64 bit??) https://ubuntuforums.org/showthread.php?t=1905963 Try LD_PRELOAD https://superuser.com/questions/735736/no-version-information-available-req… Use your package manager to check if the installed version is really 1.0.0, or instead 1.0.x. What does `ldd /usr/bin/openssl` report (or equivalent lib32 location) https://askubuntu.com/questions/830466/libcrypto-so-1-0-0-no-version-inform… Is libcrypto missing or a different version? cheers -ben

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Pharo Sprint in Lviv
by Oleksandr Zaytsev May 8, 2017

May 8, 2017

Hello! Today in Lviv (Ukraine) we had our first local Pharo Sprint. There were three participants - students of different universities. The whole event lasted for about 4 hours. In that time we have resolved one simple fix case and three review cases and reported one issue with Monticello. It's not much, but this was our first time contributing to Pharo. And the experience was very educating. Big thanks to everyone who helped us! We will be holding Pharo Sprint in Lviv every two weeks (so the next time will be on May 21). We also have a monthly event called "Beer & Smalltalk" where we talk about our projects and discuss some cool ideas. If you live nearby and have an interest in Pharo - join us. The dates of all future events will be announced on our #smalltalk-ua channel on discord. Write me or Yuriy Tymchuk (Uko) if you want to join the channel. Best wishes, Oleks

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SSL/TLS plugin initailization failed (VM plugin missing ? OS libraries missing ?)
by Julien Delplanque May 8, 2017

May 8, 2017

Hello, I have this error when trying to use the network: "SSL/TLS plugin initialization failed (VM plugin missing ? OS libraries missing ?)" What library could be missing on my operating system? I appears after an update of my operating system I think. I am on Archlinux. Julien

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2nd CfP: SLE 2017 (10th ACM SIGPLAN International Conference on Software Language Engineering)
by Andrei Chis May 8, 2017

May 8, 2017

======================================================================== **Call for Papers** 10th ACM SIGPLAN International Conference on Software Language Engineering (SLE 2017) 23-24 October 2017, Vancouver, Canada (Co-located with SPLASH 2017) General chair: Benoit Combemale, University of Rennes 1, France Program co-chairs: Marjan Mernik, University of Maribor, Slovenia Bernhard Rumpe, RWTH Aachen University, Germany Artifact evaluation chairs: Tanja Mayerhofer, TU Wien, Austria Laurence Tratt, King's College London, UK Keynote Speaker: Peter D. Mosses, Swansea University, UK (http://cs.swan.ac.uk/~cspdm/) http://conf.researchr.org/track/sle-2017/sle-2017-papers http://www.sleconf.org/2017 Follow us on twitter: https://twitter.com/sleconf ======================================================================== Software Language Engineering (SLE) is the application of systematic, disciplined, and measurable approaches to the development, use, deployment, and maintenance of software languages. The term "software language" is used broadly, and includes: general-purpose programming languages; domain-specific languages (e.g. BPMN, Simulink, Modelica); modeling and metamodeling languages (e.g. SysML and UML); data models and ontologies (e.g. XML-based and OWL-based languages and vocabularies). ### Important Dates Fri 2 Jun 2017 - Abstract Submission Fri 9 Jun 2017 - Paper Submission Fri 4 Aug 2017 - Author Notification Thu 10 Aug 2017 - Artifact Submission Fri 1 Sep 2017 - Artifact Notification Fri 8 Sep 2017 - Camera Ready Deadline Sun 22 Oct - SLE workshops Mon 23 Oct - Tue 24 Oct 2017 - SLE Conference ### Topics of Interest SLE aims to be broad-minded and inclusive about relevance and scope. We solicit high-quality contributions in areas ranging from theoretical and conceptual contributions to tools, techniques, and frameworks in the domain of language engineering. Topics relevant to SLE cover generic aspects of software languages development rather than aspects of engineering a specific language. In particular, SLE is interested in principled engineering approaches and techniques in the following areas: * Language Design and Implementation * Approaches and methodologies for language design * Static semantics (e.g., design rules, well-formedness constraints) * Techniques for behavioral / executable semantics * Generative approaches (incl. code synthesis, compilation) * Meta-languages, meta-tools, language workbenches * Language Validation * Verification and formal methods for languages * Testing techniques for languages * Simulation techniques for languages * Language Integration and Composition * Coordination of heterogeneous languages and tools * Mappings between languages (incl. transformation languages) * Traceability between languages * Deployment of languages to different platforms * Language Maintenance * Software language reuse * Language evolution * Language families and variability * Domain-specific approaches for any aspects of SLE (design, implementation, validation, maintenance) * Empirical evaluation and experience reports of language engineering tools * User studies evaluating usability * Performance benchmarks * Industrial applications ### Types of Submissions * **Research papers**: These should report a substantial research contribution to SLE or successful application of SLE techniques or both. Full paper submissions must not exceed 12 pages including bibliography in ACM SIGPLAN acmart conference style (http://www.sigplan.org/Resources/Author/) * **Tool papers**: Because of SLE's interest in tools, we seek papers that present software tools related to the field of SLE. Selection criteria include originality of the tool, its innovative aspects, and relevance to SLE. Any of the SLE topics of interest are appropriate areas for tool demonstrations. Submissions must provide a tool description of 4 pages including bibliography in ACM SIGPLAN acmart conference style (http://www.sigplan.org/Resources/Author/) and a demonstration outline including screenshots of up to 6 pages. Tool demonstrations must have the keywords âTool Demoâ or âTool Demonstrationâ in the title. The 4-page tool description will, if the demonstration is accepted, be published in the proceedings. The 6-page demonstration outline will be used by the program committee only for evaluating the submission. * **Industrial papers**: These should describe real-world application scenarios of SLE in industry, explained in their context with an analysis of the challenges that were overcome and the lessons which the audience can learn from this experience. Industry paper submissions must not exceed 6 pages including bibliography in ACM SIGPLAN acmart conference style (http://www.sigplan.org/Resources/Author/) * **New ideas / vision papers**: New ideas papers should describe new, non-conventional SLE research approaches that depart from standard practice. They are intended to describe well-defined research ideas that are at an early stage of investigation. Vision papers are intended to present new unifying theories about existing SLE research that can lead to the development of new technologies or approaches. New ideas / vision papers must not exceed 4 pages including bibliography in ACM SIGPLAN acmart conference style (http://www.sigplan.org/Resources/Author/) ### Artifact evaluation SLE will for the second year use an evaluation process for assessing the quality of artifacts on which papers are based. The aim of this evaluation process is to foster a culture of experimental reproducibility as well as a higher quality in the research area as a whole. Authors of papers accepted for SLE 2017 will be invited to submit artifacts. Any kind of artifact that is presented in the paper, supplements the paper with further details, or underlies the paper can be submitted. This includes, for instance, tools, grammars, metamodels, models, programs, algorithms, scripts, proofs, datasets, statistical tests, checklists, surveys, interview scripts, visualizations, annotated bibliographies, and tutorials. The submitted artifacts will be reviewed by a dedicated Artifact Evaluation Committee (AEC). Artifacts that live up to the expectations created by the paper will receive a badge of approval from the AEC. The approved artifacts will be invited for inclusion in the electronic conference proceedings published in the ACM Digital Library. This will ensure the permanent and durable storage of the artifacts alongside the published papers fostering the repeatability of experiments, enabling precise comparison with alternative approaches, and helping the dissemination of the authorâs ideas in detail. Participating in the artifact evaluation and publishing approved artifacts in the ACM Digital Library is voluntary. However, we strongly encourage authors to consider this possibility as the availability of artifacts will greatly benefit readers of papers and increase the impact of the work. Note that the artifact evaluation cannot affect the acceptance of the paper, because it only happens after the decision about acceptance has been made. ### Publications All submitted papers will be reviewed by at least three members of the program committee. All accepted papers, including tool papers, industrial papers and new ideas / vision papers will be published in ACM Digital Library. Selected accepted papers will be invited to a special issue of the Computer Languages, Systems and Structures (COMLAN) journal. ### Awards * **Distinguished paper**: Award for most notable paper, as determined by the PC chairs based on the recommendations of the program committee. * **Distinguished reviewer**: Award for distinguished reviewer, as determined by the PC chairs using feedback from the authors. * **Distinguished artifact**: Award for the artifact most significantly exceeding expectations, as determined by the AEC chairs based on the recommendations of the artifact evaluation committee. ### Program Committee Marjan Mernik (co-chair), University of Maribor, Slovenia Bernhard Rumpe (co-chair), RWTH Aachen University, Germany Christian Berger, Chalmers, Sweden Mark van den Brand, TU Eindhoven, The Netherlands Ruth Breu, University of Innsbruck, Austria Jordi Cabot, ICREA, Spain Walter Cazzola, University of Milan, Italy Marsha Chechik, University of Toronto, Canada Tony Clark, Middlesex University, UK Tom Dinkelaker, Ericsson, Germany Bernd Fischer, Stellenbosch University, South Africa Sebastian Gerard, CEA, France Jeff Gray, University of Alabama, USA Esther Guerra, Autonomous University of Madrid, Spain Michael Homer, Victoria University of Wellington, New Zealand Ralf LÃ¤mmel, University of Koblenz-Landau, Germany Tihamer Levendovszky, Microsoft, USA Gunter Mussbacher, McGill University, Canada Terence Parr, University of San Francisco, USA Jaroslav PorubÃ¤n, University of KoÅ¡ice, Slovakia Jan Ringert, Tel Aviv University, Israel Julia Rubin, University of British Columbia, Canada Tony Sloane, Macquarie University, Australia Eugene Syriani, University of Montreal, Canada Emma SÃ¶derberg, Google, Denmark Eric Van Wyk, University of Minnesota, USA Jurgen Vinju, CWI, Netherlands Eric Walkingshaw, Oregon State University, USA Andreas Wortmann, RWTH Aachen University, Germany Tian Zhang, Nanjing University, China ### Contact For any question, please contact the organizers via email: sle2017(a)inria.fr

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using UFFI in non-crashing way
by Peter Uhnak May 7, 2017

May 7, 2017

Hi, is it possible to use UFFI and avoid crashing the image when the called code segfaults? In other words, can I somehow wrap the call and throw in-image Exception/Error on failure instead of the whole thing crashing? Or is the only way to do that have the called thing running as a separate app (e.g. via OSSubProcess) and communicate via pipes or sockets? Thanks, Peter

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Re: [Pharo-users] Process scheduling
by Ben Coman May 7, 2017

May 7, 2017

On Mon, May 1, 2017 at 4:42 AM, <raffaello.giulietti(a)lifeware.ch> wrote: > On 30/04/17 17:01, Ben Coman wrote: > > > > > > On Sun, Apr 30, 2017 at 10:11 PM, <raffaello.giulietti(a)lifeware.ch > > <mailto:raffaello.giulietti@lifeware.ch>> wrote: > > > > Hi, > > > > I can't find a description on how ProcessorScheduler in Pharo (i.e., > > Cog) is supposed to do context switches in absence of other > > synchronization points. > > > > Is it following the BlueBook spec? Just to recall that model, the VM, > > when about to execute the current bytecode instruction of the current > > Process, checks whether a strictly higher priority Process is ready > to > > run and if so, switches to (one of) the highest priority among them. > > > > Thanks in advance for clarifications. > > > > > > This topic is probably a bit advanced pharo-users list. > > You'll likely get better answers in vm-dev list of pharo-dev list. > > Can you post any follow ups there? > > > > ProcessScheduler doesn't have much to do with context switching, > > except providing the #yield primitive for a user to invoke manually. > > As you noted, the actual context switching happens in the VM. > > > > The charts here [1] might be useful to get an overview of the execution > > loop. > > Keep in mind though Its a very rough view of a novice exploring the Cog > > execution engine > > and may not be entirely accurate. But it will give you a starting point. > > > > For another example, look at > > CoInterpreterPrimitives>>primitiveEnterCriticalSection > > in VMMaker (http://source.squeak.org/VMMaker) > > > > cheers -ben > > Hi Ben, > > of course, I can post the question on the pharo-dev mailing list and > certainly will if nobody on this one can answer my question. > > However, Process is a Pharo user level class, I was responding to your literal question about ProcessScheduler and what part of the system does the context switching. Now I'm guessing your interest is more about user-level multi-threaded behaviour of Processes, so I hunted down some discussions you may find be interesting * http://forum.world.st/The-Trunk-Kernel-mt-1009-mcz-td4887889.html (search for preemptionYields) * http://forum.world.st/threading-in-Pharo-td4750534.html * http://forum.world.st/threading-in-Pharo-td4750534.html * http://forum.world.st/VM-Maker-VMMaker-oscog-eem-942-mcz-td4790993.html However I didn't quite follow where you said... "in absence of other synchronization points." Do you mean without suspend/resuming Processes or waiting/signalling Semaphore and something else? I'm not sure if this is what your looking for, but in summary... Processes at the same priority are scheduled cooperatively. they must deliberately yield or sleep to be put at the back of their priority's run-queue.before another process of same priority can run. Higher priority processes pre-empt lower priority processes only when they are woken (i.e. signalled or resumed). The pre-empted process stays at the front of its priority's run-queue so that the higher-priority-preemption is transparent to the same-priority-cooperative scheduling. not something private to > the implementation of the vm. Any programmer should know what to expect > and what to not expect when different Processes are started, and how > they behave and interact. It's part of the general knowledge of the > Smalltalk programming model, on par with Object, Class and Behavior. > So, before I switch to the pharo-dev list, let's wait and see... > > BTW, it seems that reference [1], containing the charts you mention, > could not find its way in your reply. Can you please make it available? > > Whoops. [1] http://forum.world.st/CogVM-Execution-Flow-td4900675.html#a4900676 -------------------- Now a follow up question of my own, for [pharo-dev]. The Process comment says "When any one of several paths of control can be advanced, the single instance of ProcessorScheduler named Processor **determines** which one will actually be advanced partly using the value of priority." Did I misunderstand how this works? I thought determination of which process next ran occurred in the VM by StackInterpreter>>wakeHighestPriority and ProcessorScheduler seems more a place to just get values associated scheduling. cheers -ben

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