December 2015 - Pharo-dev - lists.pharo.org

Classes with isVariable=true
by Denis Kudriashov Dec. 24, 2015

Dec. 24, 2015

Hello. I try to look how many classes has "isVariable=true" and "instSize>0". And I found two strange cases: PathTests and FileReferenceTest is variable classes. Why they are variable? And more general: how classes become variable? For example Path isVariable = true. But I not see initialize method which set it. Best regards, Denis

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Re: [Pharo-dev] Examples
by Torsten Bergmann Dec. 23, 2015

Dec. 23, 2015

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Can I access symbolic constants from NB FFI?
by Mariano Martinez Peck Dec. 23, 2015

Dec. 23, 2015

Hi guys, Say I want to call to waitpid like this: waitpid(childID, &status, WNOHANG); How can I do since I don't have access to WNOHANG int value in order to send it via argument .... ??? Any idea? Thanks in advance, -- Mariano http://marianopeck.wordpress.com

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Re: [Pharo-dev] [Pharo-users] [ANN] Pharo Consortium Sponsored Development Effort
by Ben Coman Dec. 23, 2015

Dec. 23, 2015

On Tue, Dec 22, 2015 at 3:20 AM, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > > > On Sun, Dec 20, 2015 at 5:21 PM, Thierry Goubier <thierry.goubier(a)gmail.com> > wrote: >> >> Hi Mariano, >> >> Le 20/12/2015 19:54, Mariano Martinez Peck a Ã©crit : >>> >>> Hi Dimitri, Dave et all. >>> >>> First let me do a little disclaimer. Regarding the developments itself >>> of this sponsorship, we discussed about the topics I said in the first >>> email. However, those are not written in stone and that's why I also >>> asked for feedback. As you know, Pharo has relatively little resources >>> so those should be well spent. If we decide to take a spin into a >>> project X, it doesn't mean other projects are not worth. It simply means >>> that we think X will be the most useful for the time being. >>> >>> One of the final goals of the discusses topics, is to improve a bit the >>> infrastructure for using Pharo as scripting (imagine Coral). For such a >>> thing, we believe that improving FileSystem and OSProcess-like is a good >>> first step to improve the underlying infrastructure. >> >> >> Would we have access then to a command-line oriented minimal Pharo image? >> > > Well, just for putting perspective my sponsorship is about 3 full months of > work effort. It doesn't mean I won't work beyond that. But to give you an > idea. I think we all want minimal images , command line etc. And Pharo has > already done a huge effort in that direction. >>> >>> That being said, I of course like the idea of distributing processing >>> across multiple images. No wonder, my PhD tool (Marea) and related >>> sub-projects (Fuel, Ghost proxies, etc) have something to do with the >>> mentioned topic. Dave already mentioned about RemoteTask, which was >>> something I was about to mention. There is also Seamless project (now >>> used by Remote Debugger stuff) and quite other tools. Finally, I think >>> this project may have a big percentage that could be considered as >>> "research". So having a PhD / master student working on this would also >>> be nice. In fact, maybe Denis Kudriashov might work on that topic??? (he >>> is now in RMOD team). >>> >>> Also, not that forking the image is not my main short-term goal. As >>> said, I will experiment first with a simple tool to execute OS commands >>> that would be FFI based, trying to make async operations, and that would >>> help in most cases. Maybe for those that are not supported, then >>> fallback in OSProcess. Note that Dave (OSProcess author) is very helpful >>> with me and we are discussing together about this. >> >> >> My guess is that, at least on Linux/Unix, that FFI will be exactly the >> same as the one used/expressed by the OSProcess plugin, that is >> popen/system. > > > No, wait. You are getting down to the details so I want to discuss :) > > OSProcess does not use popen()/system() but rather fork()+exec(). That means > that OSProcess has implementing the very very low building blocks that would > allow you do to almost everything. But then it has it's complicated matters. > fork() + exec() cannot be implemented via FFI (this was already discussed in > another thread). Can you link that thread? I'm curious to learn this. Is it multi-thread related? I read [a]... ..."The biggest problem with using fork+exec in this way is that you can't guarantee *nothing* happens between the fork call and the exec call. If, for example, the JVM decides to GC or move memory around, you can have a fatal crash at the JVM process level. Because of that, I don't recommend using fork + exec via FFI in JRuby, even though it's pretty cool. " ..."However, since this post I've learned of the "posix_spawn" [b] function available on most Unix variants. It's basically fork + exec in a single function, plus most of the typical security and IO tweaks you might do after forking and before execing. It's definitely my recommended alternative to fork+exec for JRuby." And posix_spawn also seems recommended for use with the JVM [d] and that Windows and POSIX might have similar usage, and even better match Windows CreateProcess than fork/exec [f] [g] [h] And since with 64-bit Spur we can expect very large images, spawn may be preferred over fork/exec to minimize memory usage for creating application subprocesses [i] Fork versus threads section of [c] or should we be making use of pthread_atfork [e] ? Overall I learnt something new about forking in a multi-threaded environment "When fork() is called, only the calling thread is duplicated in the child process." [a] http://blog.headius.com/2009/05/fork-and-exec-on-jvm-jruby-to-rescue.html [b] http://pubs.opengroup.org/onlinepubs/009695399/functions/posix_spawn.html [d] http://skife.org/java/2012/01/24/java_daemonization_with_gressil.html [c] http://repository.readscheme.org/ftp/papers/sw2002/gasbichler.pdf [e] http://stackoverflow.com/questions/4223553/c-does-exec-have-to-immediately-… [f] http://stackoverflow.com/questions/33249253/what-is-the-difference-between-… [g] http://stackoverflow.com/questions/5883462/linux-createprocess [h] http://www.linuxquestions.org/questions/programming-9/fork-exec-versus-posi… [i] http://www.oracle.com/technetwork/server-storage/solaris10/subprocess-13643… > However, there is a lot of other stuff that we believe it > could. So... what we wanted to see if it is possible is to have one only (or > very few) primitives (like forkAndExec) and all the rest via FFI. And then > all the features I listed in the first email of this thread. > > With that in mind, we believe that: > > 1) Before starting dealing with forkAndExec, we could try a first prototype > using popen(). That would allow us test a 100% FFI based approeach, deal > with writing and reading from pipes via stream, face the blocking issue, see > a prototype on how to read async from pipes etc etc etc. If we see this > works nicely, on a second step we can build another approach that instead of > popen() uses forkAndExec primitive. Is popen() being restricted to unidirectional part of this consideration [j] ? Also I read [j] that a problem with popen is that you do not get pid of child so you cannot wait on command to complete. Could posix_spawn be preferrable to popen? and just btw, mildly interesting is using sockets rather than pipes for interprocess communication [l] [j] http://stackoverflow.com/questions/3884103/can-popen-make-bidirectional-pip… [k] http://stackoverflow.com/questions/6743771/popen-alternative [l] http://stackoverflow.com/questions/25161377/open-a-cmd-program-with-full-fu… > > 2) We believe that there is a large number of OSProcess users that use > OSProcess only for executing OS commands AND popen() approach would be more > than enough (we will do a survey about this). So, a very simply solution via > FFI for these users rather than having all OSProcess, Command Shell, the > plugins etc, may be worth. > > What do you think? > >> >> Now, given some of the difficulties seen when dealing with external >> processes, I'd be wary of the "async" side of things. Random failures >> seemingly linked to signal loss are certainly not something I'd like to >> debug. >> > > Indeed, it won't be easy I guess. But sometimes the process you execute may > take quite some time and blocking the VM for that period is not a good > choice. So... what would you prefer to solve that? Do you prefer image-based > pooling as OSProcess does when IOPlugin is not used? How much might your work overlap with the Threaded FFI project for Cog?... ..."The Cog VM is single-threaded, providing green threads to the Smalltalk level, as do most Smalltalk VMs. There is a prototype subclass of the CoInterpreter, CoInterpreterMT, which provides a Python-like multi-threaded VM where any number of threads can share the VM with only one running the VM at any one time. This uses an extremely simple low-level scheme for releasing and re-acquiring ownership of the VM designed by David Simmons. This results in any and all FFI calls being non-blocking since there is such a low overhead to making a non-blocking FFI call that all FFI calls can be non-blocking. Eliot has worked on this, implementing the prototype and the reentrant FFI plugin it requires. But this needs to be revived. It would be a really powerful enhancement." cheers -ben P.S. Just another article warning against mixing fork and multiple-threads (which it seems posix_spawn may avoid)... http://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-usi…

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A Suggested Promotion
by Torsten Bergmann Dec. 23, 2015

Dec. 23, 2015

Jecel Assumpcao Jr. wrote on squeak-dev: >>In fact, it could be an extremely stripped down Linux focused exclusively >>on running Squeak (like Dan Ingalls did for his weather station). One >>advantage of that is that the boot time would be much smaller than what >>people are used to. John Hylands wrote on squeak-dev >My brother and I have been experimenting with Tiny Core Linux, which is >available on the Pi as piCore. > >It boots in 12 seconds, from power on to login prompt, on a Pi 2. That >gives you wifi plus an openssh server. It would probably add a few seconds >to get a graphical shell running, which it also includes. Note that for Pharo there is a project from Mike Filonov (owner of pharocloud.com) which was initially called "PharoNOS". It is also based on TinyCore Linux, here x86 based directly booting into Pharo. A description and an downloadable ISO is available on [1]. Runs fine on VirtualBox. >From the name often people thought it was a project similar to "SqueakNOS" (but SqueakNOS boots into Squeak and needed no Linux or other underneath as even the drivers were written in Smalltalk). I guess therefore Mike renamed the project to "Pharocloud OS" now, he also made the build scripts available on [2]. I also did some experiments with Pharo on the Pi - described in an article on [3]. The result was similar: directly booting into the Pharo environment/ a Smalltalk application - but on the Pi. There is Raspbian underneath. A video is available on [4]. However: if there is now some interest in having a fast and direct Squeak/Pharo booting on the Pi maybe this could be a shared effort between both communities as well. Beside squeak-dev I therefore CC the pharo-dev mailinglist as well. Bye T. [1] http://pillarhub.pharocloud.com/hub/mikefilonov/pharonos [2] http://os.pharocloud.com [3] https://medium.com/concerning-pharo/pharo-pi-9eef257b6a21#.qgqg6765p [4] https://www.youtube.com/watch?v=sfxFqQIuawg

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[JOB][OFFTOPIC] Mobile Developer: iOS.
by marcus.denker＠inria.fr Dec. 23, 2015

Dec. 23, 2015

(a bit off-topic, 2Denker GmbH, a member of the Pharo Consortium, is looking to hire an iOS developer) 2Denker GmbH is looking for a full time iOS developer to strengthen our international team of mobile developers. - Permanent job - International Team - Cologne! With Carneval! 2Denker GmbH is a small company with offices in the center of Cologne (close to Neumarkt square). We work in small teams on software for mobile devices (fronted / backend). The work consists both in maintenance (and further development) of existing applications as well as developing new projects from scratch. We are looking for a developer to join the team locally in Cologne, to be hired on a permanent contract. - iOS programming - UI Design - Location based services - Speaking german is a plus but not required Company: 2denker GmbH Contact: Herr Norbert Hartl Where: Reinoldstr. 6 50676 Koeln Phone: +49 221 27225945 E-Mail: mail(a)2denker.de Website: http://2denker.de (english website is quite out of date...)

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[pharo-project/pharo-core]
by GitHub Dec. 23, 2015

Dec. 23, 2015

Branch: refs/tags/50510 Home: https://github.com/pharo-project/pharo-core

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[pharo-project/pharo-core] 7c9d70: 50510
by GitHub Dec. 23, 2015

Dec. 23, 2015

Branch: refs/heads/5.0 Home: https://github.com/pharo-project/pharo-core Commit: 7c9d70d0de635c6d1ba7d2d6319d2c947920a88a https://github.com/pharo-project/pharo-core/commit/7c9d70d0de635c6d1ba7d2d6… Author: Jenkins Build Server <board(a)pharo-project.org> Date: 2015-12-23 (Wed, 23 Dec 2015) Changed paths: A GTInspector-Help.package/GTInspectorHelp.class/README.md A GTInspector-Help.package/GTInspectorHelp.class/class/accessing/bookName.st A GTInspector-Help.package/GTInspectorHelp.class/class/accessing/pages.st A GTInspector-Help.package/GTInspectorHelp.class/class/documentation/contact.st A GTInspector-Help.package/GTInspectorHelp.class/class/documentation/overview.st A GTInspector-Help.package/GTInspectorHelp.class/class/documentation/roassal.st A GTInspector-Help.package/GTInspectorHelp.class/class/documentation/table.st A GTInspector-Help.package/GTInspectorHelp.class/definition.st M ImportingResource-Help.package/ImportingResourceHelp.class/class/documentation/importingIcon.st A Metacello-Platform.package/MetacelloPharo30Platform.class/README.md A Metacello-Platform.package/MetacelloPharo30Platform.class/class/initialize-release/initialize.st A Metacello-Platform.package/MetacelloPharo30Platform.class/definition.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/defaultDirectory.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/directoryFromPath_relativeTo_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/ensureDirectoryExists_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/fileDirectoryClass.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/fileFromPath_relativeTo_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/fileHandleOn_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/parentDirectoryOf_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/readStreamOn_do_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/recursiveDelete_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/file system/tempFileFor_suffix_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/github support/downloadZipArchive_to_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/github support/extractRepositoryFrom_to_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/github%2Fbitbucket support/downloadJSON_username_pass_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/monticello/newVersionForWorkingCopy_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/pharo 2%2E0 compat/packageInfoFor_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/pharo 2%2E0 compat/registerPackageNamed_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/scripting/defaultRepositoryDescription.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/system/suspendSystemUpdateEventsDuring_.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/utilities/compiler.st A Metacello-Platform.package/MetacelloPharo30Platform.class/instance/utilities/string_includesSubstring_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/README.md R Metacello-Platform.package/MetacelloPharoPlatform.class/class/initialize-release/initialize.st R Metacello-Platform.package/MetacelloPharoPlatform.class/definition.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/attributes/defaultPlatformAttributes.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/notification/collection_do_displaying_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/notification/do_displaying_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/reflection/copyClass_as_inCategory_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/repository creation/createRepository_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/repository creation/extractTypeFromDescription_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/utilities/authorName.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/utilities/authorName_.st R Metacello-Platform.package/MetacelloPharoPlatform.class/instance/utilities/timestamp.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/README.md R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/class/initialize-release/initialize.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/definition.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/defaultDirectory.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/directoryFromPath_relativeTo_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/ensureDirectoryExists_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/fileDirectoryClass.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/fileFromPath_relativeTo_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/fileHandleOn_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/parentDirectoryOf_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/readStreamOn_do_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/recursiveDelete_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/file system/tempFileFor_suffix_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/github support/downloadZipArchive_to_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/github support/extractRepositoryFrom_to_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/github%2Fbitbucket support/downloadJSON_username_pass_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/monticello/newVersionForWorkingCopy_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/pharo 2%2E0 compat/packageInfoFor_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/pharo 2%2E0 compat/registerPackageNamed_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/scripting/defaultRepositoryDescription.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/system/suspendSystemUpdateEventsDuring_.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/utilities/compiler.st R Metacello-Platform.pharo30.package/MetacelloPharo30Platform.class/instance/utilities/string_includesSubstring_.st R ScriptLoader50.package/ScriptLoader.class/instance/pharo - scripts/script50509.st A ScriptLoader50.package/ScriptLoader.class/instance/pharo - scripts/script50510.st R ScriptLoader50.package/ScriptLoader.class/instance/pharo - updates/update50509.st A ScriptLoader50.package/ScriptLoader.class/instance/pharo - updates/update50510.st M ScriptLoader50.package/ScriptLoader.class/instance/public/commentForCurrentUpdate.st Log Message: ----------- 50510 17291 The ImportingResourceHelp has to be updated https://pharo.fogbugz.com/f/cases/17291 17255 Need of a GTInspector help https://pharo.fogbugz.com/f/cases/17255 17238 Clean Metacello-Platform package https://pharo.fogbugz.com/f/cases/17238 http://files.pharo.org/image/50/50510.zip

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How to create a 16x16 icon from a .png file?
by Alexandre Bergel Dec. 23, 2015

Dec. 23, 2015

Hi! A couple of month ago the following expression was working: ThemeIcons new createIconMethodsFromFile: 'cube' directory: '/Users/alexandrebergel/Desktop/cubeâ Now it does not. How can I import .png files in Pharo? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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new CryptOCap architecture, known as the Split Mushroom
by Robert Withers Dec. 23, 2015

Dec. 23, 2015

Split Mushroom -- . .. ... ^,^ robert Go Panthers!

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