May 2016 - Pharo-users - lists.pharo.org

SPLASH-I 2016: Call for Talk Proposals!
by Tijs van der Storm May 11, 2016

May 11, 2016

SPLASH-I: Innovation, Interaction, Insight, Industry, Invited The ACM SIGPLAN conference on Systems, Programming, Languages and Applications: Software for Humanity (SPLASH) embraces all aspects of software construction and delivery to make it the premier conference at the intersection of programming, languages, and software engineering. SPLASH 2016 will take place from Sunday, October 30 to Friday, November 4, 2016 in Amsterdam, The Netherlands. SPLASH-I is the track of SPLASH dedicated to great talks on exciting topics! SPLASH-I will run in parallel with all of SPLASH (during the week days), and is open to all attendees. SPLASH-I will host both invited talks and selected talks submitted via this call for proposals. SPLASH-I solicits inspiring talks, tutorials and demonstrations on exciting topics related to programming and programming systems, delivered by excellent speakers from academia or industry. SPLASH-I caters for three categories of presentations: - Regular talks on programming languages, systems or concepts; - Tutorials aimed at introducing particular tools, systems, or languages - Demonstrations showing off cool programming technology. All slots in SPLASH-I are 45 minutes. Please submit proposals here: http://goo.gl/forms/FZqQwpd73G Have a suggestion for a great speaker and topic? Suggest it here: http://goo.gl/forms/MWzgStWkww SPLASH-I maintains two deadlines: 1st of June, and, if there are still slots available, 1st of August. Websites: http://2016.splashcon.org/track/splash-2016-splash-i Organization: Eelco Visser (TU Delft), Tijs van der Storm (CWI) Committee: - Matthias Hauswirth (University of Lugano) - Igor Peshansky (Google) - Tiark Rompf (Purdue & Oracle Labs) - Jurgen Vinju (CWI)

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Re: [Pharo-users] Pharo-users Digest, Vol 37, Issue 28
by Vince Refiti May 11, 2016

May 11, 2016

test On Wed, May 11, 2016 at 9:00 AM, <pharo-users-request(a)lists.pharo.org> wrote: > Send Pharo-users mailing list submissions to > pharo-users(a)lists.pharo.org > > To subscribe or unsubscribe via the World Wide Web, visit > > http://lists.pharo.org/mailman/listinfo/pharo-users_lists.pharo.org > or, via email, send a message with subject or body 'help' to > pharo-users-request(a)lists.pharo.org > > You can reach the person managing the list at > pharo-users-owner(a)lists.pharo.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Pharo-users digest..." > > > Today's Topics: > > 1. Re: Semaphore wait and signal (Ben Coman) > 2. Re: (no subject) (Ben Coman) > 3. Re: (no subject) (phil(a)highoctane.be) > 4. SPLASH 2016: Call for Sponsorships (Tijs van der Storm) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 11 May 2016 00:28:32 +0800 > From: Ben Coman <btc(a)openinworld.com> > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > Subject: Re: [Pharo-users] Semaphore wait and signal > Message-ID: > <CAProBTnUgFZBiGqi3QdamUdG= > TsKMcyNyoPSNhTpS2D0zG3Jvg(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On Tue, May 10, 2016 at 6:31 PM, Vince Refiti <vinref(a)gmail.com> wrote: > > Hello > > > > I am playing around with Semaphore, and wrote the following: > > > > | coll count sem | > > coll := Array withAll: (1 to: 100). > > count := 0. > > sem := Semaphore new. > > coll do: [ :each | > > count := count + 1. > > (count >= 5) > > ifTrue: [ > > Transcript show: 'waiting...'; cr. > > sem wait ]. > > > > [ [ 2 seconds asDelay wait. > > Transcript show: each printString, ' ', count printString; cr ] > > ensure: [ > > count := count -1. > > sem signal ] ] fork ] > > > > The output is: > > [snipped] > > > I was expecting 'waiting...' to alternate with the 'each-count' lines. > Also > > the entire statement paused for 2 seconds, spat out some lines, then > waited > > a little longer, and then finished. > > > > Can someone please explain this pattern? > > > > Thanks, Vince > > Hi Vince, > > General things to be aware of... > * Transcript is not perturbing your result. > * Playground code is executed in the context of the main UI-process. > Thus... > * An infinite loop will lock the UI. > * A sem wait will lock the UI. > * Processes at the same priority are scheduled cooperatively. > * Processes at different priority are pre-emptively scheduled. > > I refactored your example to better highlight program flow... > > | coll count sem | > Transcript clear. > coll := Array withAll: (1 to: 99). > count := 0. > sem := Semaphore new. > coll do: > [ :each | > count := count + 1. > Transcript crShow: each printString; tab; tab; show: count printString, > '+'. > (count >= 5) ifTrue: > [ sem isSignaled > ifTrue: [ Transcript tab; show: ' nowait'. > sem wait ] > ifFalse: [ Transcript tab; show: ' wait'. > sem wait. > Transcript crShow: each printString; tab; > tab; show: count printString; tab; show: ' postwait, excessSignals ' , > sem excessSignals printString. ] > ]. > > [ Transcript crShow: ' ', each printString; tab; tab; show: count > printString; tab; show: ' delay'. > 2 seconds asDelay wait. > count := count -1. > Transcript crShow: ' ', each printString; tab ; tab; show: count > printString, '-'; tab; show: ' signal'. > sem signal. > ] fork. > ] > > You will need to add... > Semaphore>>excessSignals > ^excessSignals > > > For counts 1, 2, 3 & 4, forked processes -1 to -4 are queued to run, > but don't run until the UI-process suspended by the wait at each=5, > count=5, which is why the "waiting..." tag appears first. > > When the UI-process waits, processes -1 to -4 run in turn and > immediately delay for two seconds. After this, they queued to run. > Process-1 signals the UI-process to be queued to run. But processes > -2 to -4 run first, signalling sem an extra three times. > > When the UI-process resumes, each=5, count=1 and sem has three > excessSignals. Completing the do: adds process -5 to the run queue. > Then counts 2, 3, & 4 queues processes -6, -7 & -8 to run. Counts 5, > 6 & 7 consume the excessSignals without suspending, queing processes > -9, -10 & -11 to run. > > At count=8, the UI-process suspends at the wait, and process -5 runs. > This signals the UI-process to be queued to run. Processes -6 to -11 > run, signalling sem an extra six times. > > When the UI-process resumes, each=12, count=1 and sem has six > excessSignals. Completing the do: adds process -12 to the run queue. > Then counts 2, 3, & 4 queues processes -13, -14 & -15 to run. Counts > 5, 6, 7, 8, 9, 10 consume the excessSignals without suspending, queing > processes -16, -17, -18, -19, -20, -21 to run. > > At count=11, the UI-process suspends at the wait, and process -12 > runs. This signals the UI-process to be queued to run. Processes -13 > to -21 run, signalling sem an extra nine times. > > ecetera... > > btw, The delay doesn't make much difference to how the forked > processes interact with the main UI-process, since all forked > processes execute before the UI-process resumed. It just interleaves > the delay/signal tags rather than grouping them. > > > 1 1+ > 2 2+ > 3 3+ > 4 4+ > 5 5+ wait > 1 5 delay > 2 5 delay > 3 5 delay > 4 5 delay > 1 4- signal > 2 3- signal > 3 2- signal > 4 1- signal > 5 1 postwait, excessSignals 3 > 6 2+ > 7 3+ > 8 4+ > 9 5+ nowait > 10 6+ nowait > 11 7+ nowait > 12 8+ wait > 5 8 delay > 6 8 delay > 7 8 delay > 8 8 delay > 9 8 delay > 10 8 delay > 11 8 delay > 5 7- signal > 6 6- signal > 7 5- signal > 8 4- signal > 9 3- signal > 10 2- signal > 11 1- signal > 12 1 postwait, excessSignals 6 > 13 2+ > 14 3+ > 15 4+ > 16 5+ nowait > 17 6+ nowait > 18 7+ nowait > 19 8+ nowait > 20 9+ nowait > 21 10+ nowait > 22 11+ wait > 12 11 delay > 13 11 delay > 14 11 delay > 15 11 delay > 16 11 delay > 17 11 delay > 18 11 delay > 19 11 delay > 20 11 delay > 21 11 delay > 12 10- signal > 13 9- signal > 14 8- signal > 15 7- signal > 16 6- signal > 17 5- signal > 18 4- signal > 19 3- signal > 20 2- signal > 21 1- signal > 22 1 postwait, excessSignals 9 > 23 2+ > 24 3+ > 25 4+ > 26 5+ nowait > 27 6+ nowait > 28 7+ nowait > 29 8+ nowait > 30 9+ nowait > 31 10+ nowait > 32 11+ nowait > 33 12+ nowait > 34 13+ nowait > 35 14+ wait > 22 14 delay > 23 14 delay > 24 14 delay > 25 14 delay > 26 14 delay > 27 14 delay > 28 14 delay > 29 14 delay > 30 14 delay > 31 14 delay > 32 14 delay > 33 14 delay > 34 14 delay > 22 13- signal > 23 12- signal > 24 11- signal > 25 10- signal > 26 9- signal > 27 8- signal > 28 7- signal > 29 6- signal > 30 5- signal > 31 4- signal > 32 3- signal > 33 2- signal > 34 1- signal > 35 1 postwait, excessSignals 12 > 36 2+ > 37 3+ > 38 4+ > 39 5+ nowait > 40 6+ nowait > 41 7+ nowait > 42 8+ nowait > 43 9+ nowait > 44 10+ nowait > 45 11+ nowait > 46 12+ nowait > 47 13+ nowait > 48 14+ nowait > 49 15+ nowait > 50 16+ nowait > 51 17+ wait > 35 17 delay > 36 17 delay > 37 17 delay > 38 17 delay > 39 17 delay > 40 17 delay > 41 17 delay > 42 17 delay > 43 17 delay > 44 17 delay > 45 17 delay > 46 17 delay > 47 17 delay > 48 17 delay > 49 17 delay > 50 17 delay > 35 16- signal > 36 15- signal > 37 14- signal > 38 13- signal > 39 12- signal > 40 11- signal > 41 10- signal > 42 9- signal > 43 8- signal > 44 7- signal > 45 6- signal > 46 5- signal > 47 4- signal > 48 3- signal > 49 2- signal > 50 1- signal > 51 1 postwait, excessSignals 15 > 52 2+ > 53 3+ > 54 4+ > 55 5+ nowait > 56 6+ nowait > 57 7+ nowait > 58 8+ nowait > 59 9+ nowait > 60 10+ nowait > 61 11+ nowait > 62 12+ nowait > 63 13+ nowait > 64 14+ nowait > 65 15+ nowait > 66 16+ nowait > 67 17+ nowait > 68 18+ nowait > 69 19+ nowait > 70 20+ wait > 51 20 delay > 52 20 delay > 53 20 delay > 54 20 delay > 55 20 delay > 56 20 delay > 57 20 delay > 58 20 delay > 59 20 delay > 60 20 delay > 61 20 delay > 62 20 delay > 63 20 delay > 64 20 delay > 65 20 delay > 66 20 delay > 67 20 delay > 68 20 delay > 69 20 delay > 51 19- signal > 52 18- signal > 53 17- signal > 54 16- signal > 55 15- signal > 56 14- signal > 57 13- signal > 58 12- signal > 59 11- signal > 60 10- signal > 61 9- signal > 62 8- signal > 63 7- signal > 64 6- signal > 65 5- signal > 66 4- signal > 67 3- signal > 68 2- signal > 69 1- signal > 70 1 postwait, excessSignals 18 > 71 2+ > 72 3+ > 73 4+ > 74 5+ nowait > 75 6+ nowait > 76 7+ nowait > 77 8+ nowait > 78 9+ nowait > 79 10+ nowait > 80 11+ nowait > 81 12+ nowait > 82 13+ nowait > 83 14+ nowait > 84 15+ nowait > 85 16+ nowait > 86 17+ nowait > 87 18+ nowait > 88 19+ nowait > 89 20+ nowait > 90 21+ nowait > 91 22+ nowait > 92 23+ wait > 70 23 delay > 71 23 delay > 72 23 delay > 73 23 delay > 74 23 delay > 75 23 delay > 76 23 delay > 77 23 delay > 78 23 delay > 79 23 delay > 80 23 delay > 81 23 delay > 82 23 delay > 83 23 delay > 84 23 delay > 85 23 delay > 86 23 delay > 87 23 delay > 88 23 delay > 89 23 delay > 90 23 delay > 91 23 delay > 70 22- signal > 71 21- signal > 72 20- signal > 73 19- signal > 74 18- signal > 75 17- signal > 76 16- signal > 77 15- signal > 78 14- signal > 79 13- signal > 80 12- signal > 81 11- signal > 82 10- signal > 83 9- signal > 84 8- signal > 85 7- signal > 86 6- signal > 87 5- signal > 88 4- signal > 89 3- signal > 90 2- signal > 91 1- signal > 92 1 postwait, excessSignals 21 > 93 2+ > 94 3+ > 95 4+ > 96 5+ nowait > 97 6+ nowait > 98 7+ nowait > 99 8+ nowait > 92 8 delay > 93 8 delay > 94 8 delay > 95 8 delay > 96 8 delay > 97 8 delay > 98 8 delay > 99 8 delay > 92 7- signal > 93 6- signal > 94 5- signal > 95 4- signal > 96 3- signal > 97 2- signal > 98 1- signal > 99 0- signal > > > > ------------------------------ > > Message: 2 > Date: Wed, 11 May 2016 00:51:12 +0800 > From: Ben Coman <btc(a)openinworld.com> > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > Subject: Re: [Pharo-users] (no subject) > Message-ID: > <CAProBT=Xvj67KV6CG+tb6qa= > jATTBuX+bgc3AnWMAz9A19x_HQ(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On Tue, May 10, 2016 at 8:52 PM, Franklin Mike > <mike1corporation(a)gmail.com> wrote: > > Hi ! > > > > I'm new on pharo and I realy like its vision. To learn more about the > system > > I decide to write a package that handle Webcam. The package should be > able > > to : > > > > - start webcam > > - take photo > > - record a video. > > > > The wonderfull thing is that I don't know where to start, Every advice is > > welcome. > > I guess you will need to interface to some library, so for Pharo 5 > have a play with its new UFFI interface. > A quick google around shows opencv to be a common base for FFI... > > http://opencvlover.blogspot.com.au/2011/07/accesing-camera-using-opencv.html > > but I also found this... > http://itseez.com/tags/openvx/ > Note that NativeBoost was an FFI implementation for Pharo 4. > > cheers -ben > > > > ------------------------------ > > Message: 3 > Date: Tue, 10 May 2016 22:55:42 +0200 > From: "phil(a)highoctane.be" <phil(a)highoctane.be> > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > Subject: Re: [Pharo-users] (no subject) > Message-ID: > < > CAMynPtw0Yy+zP5Lh2VwXPCYQvM5h+RYBBchHj-s-HciWPkwEFA(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > There is a camera plugin in the source tree of the VM. > > pharo-vm/platforms/win32/plugins/CameraPlugin > > You can copy the dll in the Pharo directory and load the dll with: > > NativeBoost forCurrentPlatform loadModule: 'CameraPlugin.dll' > > Anyone having the FFI calls? > > Maybe Phratch has it built in. > > Phil >

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SPLASH 2016: Call for Sponsorships
by Tijs van der Storm May 10, 2016

May 10, 2016

The ACM SIGPLAN conference on Systems, Programming, Languages and Applications: Software for Humanity (SPLASH) embraces all aspects of software construction and delivery to make it the premier conference at the intersection of programming, languages, and software engineering. SPLASH 2016 will take place from Sunday, October 30 to Friday, November 4, 2016 in Amsterdam, The Netherlands. Web version of this call for sponsorships: http://2016.splashcon.org/attending/support-program SPLASH is where the best of the best in software innovation, programming and programming languages convene, learn from and inspire each other, and share their passion for software. Supporting SPLASH is an opportunity to put your corporate name in front of this community â a superb investment for your organization. # Sponsorship Packages ## Diamond: $US 15 000 Benefits: - Recognition as a supporter in print and on the web. Recognized as a Diamond supporter on registration brochures and conference program - Two company-provided items placed in the conference tote bag - Official exclusive support for your choice of (subject to availability): Doctoral Symposium, Poster Session, Keynotes, or support for 8 Student Volunteers named for your organization - Attendance (for two) at an invitation-only reception by the SPLASH General Chair - Choice of: two Full conference registrations; or two complimentary main conference registrations plus two complimentary one-day pass registrations ## Gold: $US 10 000 Benefits: - Recognition as a supporter in print and on the web. Recognized as a Gold supporter on registration brochures and conference program - Two company-provided items placed in the conference tote bag - Official support for your choice of (subject to availability): Doctoral Symposium, Poster Session, Keynotes, or support for 6 Student Volunteers named for your organization - Attendance (for two) at an invitation-only reception by the SPLASH General Chair - Choice of: one Full conference registration plus one complimentary main conference registration; or two complimentary main conference registrations plus one complimentary one-day pass registration ## Silver: $US 5000 Benefits: - Recognition as a supporter in print and on the web. Recognized as a Silver supporter on registration brochures and conference program - One company-provided item placed in the conference tote bag - Official support for your choice of: four Student Volunteers named for your organization; or the Keynotes (non-exclusive support) - Attendance (for two) at an invitation-only reception by the SPLASH General Chair - Your choice of: one Full conference registration; or one complimentary main conference registration plus one complimentary one-day pass registration; or three complimentary one-day pass registrations ## Bronze $US 3000 - Recognition as a supporter in print and on the web. Recognized as a Bronze supporter on registration brochures and conference program - One company-provided one-page insert placed in conference tote bag - Official support for two Student Volunteers named for your organization - Attendance (for one) at an invitation-only reception by the SPLASH General Chair - Your choice of: one complimentary main conference registration; or two complimentary one-day pass registrations # Why sponsor SPLASH? SPLASH values innovation, collaboration, and diversity. For many software researchers, academics, students, educators, and practitioners, SPLASH is the most important conference of the year. It is a place to: - improve skills and productivity, independent of any particular product or vendor; - gain a global perspective connecting with world experts; and - discover and explore new trends and innovations in leading edge research and practice. Becoming a SPLASH corporate supporter demonstrates your leadership and commitment to the community. It is an opportunity to: - carry your message to community leaders; - associate your brand with world-class research and development; - position your company as a leader in the field; and - prepare for the future. Your corporate name and logo will be in front of the entire community throughout the conference. For the same contribution you also receive either complimentary or discounted SPLASH registrations for use by your organization. You will also have the opportunity to participate in invitation-only events that will provide you with direct, one-on-one interactions with some key members of the SPLASH community. Thank you for your time! Please do not hesitate to contact us at support(a)splashcon.org. We look forward to helping you make the most of your investment in SPLASH. Jurgen Vinju SPLASH 2016 Sponsorship Chair Eelco Visser SPLASH 2016 General Chair

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How to construct a multi-part file reference
by Johan Fabry May 9, 2016

May 9, 2016

Hi all, I have a question about the filesystem that I could not resolve using the documentation. The problem is as follows: I have a file reference that is 2 separate strings that I need to join into one complete file ref but I donât know how because I donât know what the platformâs file separator is. For example, on a unix-like OS I get â/home/jfabryâ as one part and âtest/code/foo.txtâ as the other part, and I need to construct a FileReference to â/home/jfabry/test/code/foo.txtâ.On M$ I guess this would be 'C:\users\jfabry' and âtest\code\foo.txtâ, so I need to construct FileReference to 'C:\users\jfabry\test\code\foo.txtâ And the bingo question is: what do I do if I both strings use different kinds of separators? TIA, ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD and RyCh labs - Computer Science Department (DCC) - University of Chile

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FFI documentation
by Julien Delplanque May 7, 2016

May 7, 2016

Hello, Let's say I would like to create a binding to ncurses library. Is there any documentation on how to do it properly? Or at least do you have any advice to do it the right way? I have no real knowledge on how the unified ffi work. So any documentation is welcome. Thanks in advance. :) Julien

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[ANN] Pharo Consortium New Bronze Member: feenk
by Marcus Denker May 6, 2016

May 6, 2016

The Pharo Consortium is very happy to announce that feenk has joined the Consortium as a Bronze Member. About - feenk: http://www.feenk.com - Pharo Consortium: http://consortium.pharo.org The goal of the Pharo Consortium is to allow companies and institutions to support the ongoing development and future of Pharo. Individuals can support Pharo via the Pharo Association: - http://association.pharo.org - https://salt.bountysource.com/teams/pharo

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Securely downloading Pharo
by Wilfred Hughes May 6, 2016

May 6, 2016

Is there any way of downloading Pharo securely? I'm trying to download Pharo itself over HTTPS, so I know I can trust the data: $ wget https://files.pharo.org/platform/Pharo4.0-linux.zip --2016-05-02 22:44:34-- https://files.pharo.org/platform/Pharo4.0-linux.zip Resolving files.pharo.org (files.pharo.org) 128.93.162.72 Connecting to files.pharo.org (files.pharo.org)|128.93.162.72|:443... connected. OpenSSL: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol Unable to establish SSL connection. The excellent pharo zeroconf script doesn't seem available over HTTPS either: $ curl https://get.pharo.org/vm50 curl: (35) error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol Looking at the script itself, it's downloading files over HTTP from files.pharo.org and executing them without verifying. I've explored files.pharo.org, but I can't see any signatures or hashes (e.g. sha256sum) of any of the files. The pharo homepage is largely available at https://pharo.org/ (although some of the styling is missing due to being served over HTTP). Have I missed something? Would it be possible to provide HTTPS and/or sha256sums for downloads? Wilfred

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[ANN] Pharo Astares Distribution
by Torsten Bergmann May 5, 2016

May 5, 2016

Hi, I summarized some of the goodies that I wrote like - DesktopManager - QuickAccess - HubCap - WebBrowser - MessageFlowBrowser - ... into an own kind of Pharo distribution that I call AstaresDistribution. So if you already use these goodies it is easier to load quickly into a fresh image. You can load directly from Catalog or by opening Spooter, enter "Astares" and hit ENTER to load. Alternatively you can download a prebuilt image using PharoLauncher from "Pharo Contributions Jenkins" -> "AstaresDistribution" or directly from [1]. Screenshot attached. Have fun T. [1] https://ci.inria.fr/pharo-contribution/job/AstaresDistribution

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Documentation about Pharo Launcher?
by Offray Vladimir Luna CÃ¡rdenas May 5, 2016

May 5, 2016

Hi all. I would like to made one of my images available through Pharo Launcher. Anyone knows where I can find documentation about this? I can't find anything on the StHub page for the project. Thanks, Offray

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NoSWL Databases
by AWS May 4, 2016

May 4, 2016

Hi there. I am currently trying to finish an Open University degree that I started back in the '70s. Eventually, I will have to create a project for the final module. The current course is all about Database management and analysis. We are currently looking at NoSQL databases and I would like to try out one of these against some ideas I have for the project. I am wondering if anyone out there has any experience of using Pharo against either Riak or MongoDB? I can probably drive Riak from using HTTP gets and puts but MongoDB appears to need JavaScript. I would prefer to use Python, which has a MongoDB interface available. Again, does anyone have any thoughts on interfacing Pharo with Python? David Totally Objects. Long Haired David A.K.A. David Pennington Message sent using Winmail Mail Server

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