January 2022 - Pharo-dev - lists.pharo.org

Sockets not working under heavy VM load?
by Pavel Krivanek Oct. 3, 2023

Oct. 3, 2023

Hi, we have some performance issues with Glorp over P3 and, after some investigation, I have a theory that could explain it. And I would like to know your opinion if it is correct. To reproduce this issue, you can try something easy. Just create a process with normal or higher priority that will try to read something from a socket. And, in parallel, do in a separate thread an operation that takes all the processor time for several seconds. ```` [ 5 seconds wait. Time now traceCr. ZnClient new url: 'https://www.google.com'; get. Time now traceCr. ] forkAt: 60. [1000 timesRepeat: [ 10000 factorial ] ] timeToRun ```` (you may try a different safe server address) The processes run in parallel until the time when the first process tries to obtain data from the socket. Then it hangs and waits until finishing of the second process. My theory is that the VM socket plugin is able to receive incoming data from the connection and save it into the buffer. In the meantime, the reading process is waiting on the socket semaphore. But it looks like the plugin is not able to release the semaphore while the VM is actually doing something. It needs to wait until the VM has nothing useful to do, and then it is finally able to release the semaphores so Pharo processes are resumed and can start to read. Is my theory right? Cheers, -- Pavel

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Recommendation for password encryption?
by Mariano Martinez Peck Sept. 30, 2022

Sept. 30, 2022

Hi guys. Some time ago I asked about the best way to encrypt a password. Some of the recommendations I got was: 1) Generally for passwords you do not write a decrypt method for security purposes (eg you do not want people to be able to reverse engineer the encrypted password easily) 2) put a little salt 3) There is http://www.squeaksource.com/Cryptography/PasswordHashingFFI 4) I should not decrypt password but instead I should compare both encrypted versions to see if they are equal. My scenario is the following. I need to store database passwords in text files. So I don't want to let them as plain text. And while I understand 4), I think it's a different scenario than mine. I know that some database driver may allow you to directly send the encrypted password. But still...I have another similar scenario in which I have to store a password and then send it (unencrypted)...so I kind of really need a bi-directional encryption. Now..I would try to avoid having an external library + FFI. Any ideas what is the best thing I can do? And how could I solve 1) if I want bidirectional like in my case? Thanks in advance, -- Mariano http://marianopeck.wordpress.com

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ESUG 2022 call for presentations & Call for student volunteers
by stephane ducasse April 23, 2022

April 23, 2022

ESUG 2022 Novisad Serbia 22. â 26.8. https://esug.github.io/2022-Conference/call2022.html You can support the ESUG conference in many different ways: Sponsor the conference. New sponsoring packages are described at http://www.esug.org/supportesug/becomeasponsor/ <http://www.esug.org/supportesug/becomeasponsor/> Submit a talk, a software or a paper to one of the events. See below. Attend the conference. We'd like to beat the previous record of attendance (170 people at Amsterdam 2008)! Students can get free registration and hosting if they enroll into the the Student Volunteers program. See below. <>Developers Forum: International Smalltalk Developers Conference We are looking for YOUR experience on using Smalltalk. You will have 30 min for presentations and 45 min for hands-on tutorials. The list of topics for the normal talks and tutorials includes, but is not limited to the following: XP practices, Development tools, Experience reports Model driven development, Web development, Team management Meta-Modeling, Security, New libraries & frameworks Educational material, Embedded systems and robotics SOA and Web services, Interaction with other programming languages <>Teaching Pearls and Show us Your Business New this year!!! We added two types of sessions in addition to the regular talks and show us your projects sessions. Show your business 10 min session (Get prepared!!) Teaching pearls : we want some session on how to teach some design aspects. We want your tip and tricks to teach Smalltalk or OOP. We expect to have several 10 to 15 min sessions aggregated. <>How to submit? Make a Pull Request here https://github.com/ESUG/esug.github.io/tree/source/2022-Conference/talks Or but only if you are not connected to the worldâ¦ send an email to stephane.ducasse(a)inria.fr Title: [ESUG 2022] Please follow the template below the email will be automatically processed! Name: Email: Abstract: Bio: Call for Student Volunteers Student volunteers help keep the conference running smoothly; in return, they have free accommodations, while still having most of the time to enjoy the conference. Pay attention: the places are limited so do not wait till the last minute to apply. Conference details: Send an email to stephane.ducasse at inria.fr and serge.stinckwich at gmail.com with: title: [ESUG 2022 Student] name, gender, university/school, country, email address short description of you and why you are interested in participating For which period is accommodation covered? Accommodation is covered from Sunday 21 August until Friday 26 August 2022 (including nights from Sunday to Monday and from Thursday to Friday). Students will be hosted in student rooms. ESUG additionally covers for the lunches during the week and one dinner. Duties include handling registration as people arrive at the conference, filling coffee machines, collecting presentation slides for ESUG right after the presentation is given, being present at an information desk to answer questions, and generally being helpful. Student volunteering makes the conference better, takes a fairly small amount of time and doesn't significantly interfere with enjoying and learning from the conference. Please Note, this role requires discipline and constant attention to all attendees. Information about hotel Student Volunteer rooms are booked at (to be announced). If you are student volunteer, do not book yourself, we have arranged the booking already!

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FFI help with *** pointers to get font family list
by Stewart MacLean Jan. 31, 2022

Jan. 31, 2022

Hi, I'm trying to figure out how to implement code to retrieve a list of font families using the Pango libraries. The key function definition is: https://docs.gtk.org/Pango/method.FontMap.list_families.html void pango_font_map_list_families ( PangoFontMap* fontmap, PangoFontFamily*** families, int* n_families ) I've found some C code, which is shown below. The tricky bit is the ***. I've managed to get this working in VisualWorks (code also below), but can't figure out how to do this using the Pharo FFI. I've managed to get the basic Pango functionality going, but I can't figure out how to use ExternalAddress to do this. Running on a MacMini M1. Any pointers (:)) appreciated! Thanks, Stew C Version ---------------- #include <glib.h> #include <pango/pangocairo.h> static void list_fonts () { int i; PangoFontFamily ** families; int n_families; PangoFontMap * fontmap; fontmap = pango_cairo_font_map_get_default(); pango_font_map_list_families (fontmap, & families, & n_families); printf ("There are %d families\n", n_families); for (i = 0; i < n_families; i++) { PangoFontFamily * family = families[i]; const char * family_name; family_name = pango_font_family_get_name (family); printf ("Family %d: %s\n", i, family_name); } g_free (families); } int main (int argc, char ** argv) { list_fonts (); return 0; } ================================= VisualWorks Version --------------------------- availableFamilyNames " Transcript clear. (FontFamily availableFamilyNames asSortedCollection: [: a : b | a < b]) do: [: each | Transcript cr; show: each]. NamedFontSelector open " "08/09/20 SIM. Modified to work on 64bit. Clues obtained from: XSurface class >>displaySurface: DisplaySurface>>cairoVisual PDFSurface class>>versions" | listPointer sizePointer ffPointers result | ObjectMemory is64Bit ifTrue: [listPointer := CIntegerType unsignedLongLong gcMalloc. sizePointer := listPointer sizeof gcCopyToHeap] ifFalse: [listPointer := 0 gcCopyToHeap. sizePointer := 0 gcCopyToHeap]. LibPango default pango_font_map_list_families: LibPango default pango_cairo_font_map_get_default with: listPointer with: sizePointer. ffPointers := (ObjectMemory is64Bit ifTrue: [CIntegerType unsignedLongLong] ifFalse: [ CIntegerType unsignedInt]) newPointerToAddress: listPointer contents. result := OrderedCollection new: sizePointer contents. sizePointer contents timesRepeat: [result add: (LibPango default pango_font_family_get_name: ffPointers contents) utf8. ffPointers += 1]. LibPango default g_free: listPointer contents. ^result

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ZTimestamp now has nanosecond precision
by Sven Van Caekenberghe Jan. 31, 2022

Jan. 31, 2022

Hi, Last year, I extended ZTimestamp with a default nanosecond precision (it previously had whole second precision). This makes it a more complete replacement for DateAndTime. https://github.com/svenvc/ztimestamp https://github.com/svenvc/ztimestamp/commit/de6c5a670ed0c6cb18894b4917383dd… The goals of ZTimestamp are to be simpler and more efficient (both faster and more compact). A ZTimestamp instance occupies half the space of a DateAndTime instance, its two slots being SmallIntegers. Back in the 32-bit days, the seconds since midnight field was too small for nanoseconds. Now, 64-bit is the default and there is enough room and no speed penalty for working with nanoseconds since midnight. In casual use, you won't see much of a difference, apart from the added detail: ZTimestamp now. "2022-01-27T09:21:20.528695Z" There are ways to convert to the older precision: ZTimestamp now truncated. ZTimestamp now rounded. ZTimestamp nowTruncated. Obviously, other methods and classes now support this added precision (like ZTimestampFormat). If you load or depend on tag/release v25 you get the latest version before this major change. If you encounter any problems please let me know. Sven

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This week (04/2022) on the Pharo Issue Tracker
by Marcus Denker Jan. 28, 2022

Jan. 28, 2022

We merged 23 PRs and closed 24 Issue Tracker entries Fixes ===== - Fix 10741: Adding an unknown SharedPool and canceling the proposed choice brings a debugger #10808 https://github.com/pharo-project/pharo/pull/10808 - 10695-CmdBrowse-raise-a-DNU #10775 https://github.com/pharo-project/pharo/pull/10775 - Rename "Hier" to "Hierarchy" in scopes of refactoring #10778 https://github.com/pharo-project/pharo/pull/10796 - Fix #10698: Misleading Calypso warning when defining new instance variables #10806 https://github.com/pharo-project/pharo/pull/10806 - Fix #7952: Decompiler raises Error For methods from Traits on class side #10807 https://github.com/pharo-project/pharo/pull/10807 - Fix #8630: fix allInstVarNames for Traits with State #10811 https://github.com/pharo-project/pharo/pull/10811 Spec2 ===== - 10721-Porting-ExternalBrowser-to-Spec2-and-remove-Spec1-version #10776 https://github.com/pharo-project/pharo/pull/10776 - 10722-Porting-ChangesBrowser-to-Spec2-and-remove-Spec1-version #10786 https://github.com/pharo-project/pharo/pull/10786 - Load Spec2-Transformations package after Refactoring-Core is loaded #10789 https://github.com/pharo-project/pharo/pull/10789 - spec2 auto-rewrites #10791 https://github.com/pharo-project/pharo/pull/10791 - commit spec rewrites 2 #10792 https://github.com/pharo-project/pharo/pull/10792 - Rename defaultSpec to defaultLayout #10793 https://github.com/pharo-project/pharo/pull/10793 - Move Dependency Analyzer to Spec2 #10813 https://github.com/pharo-project/pharo/pull/10813 Cleanup ======= - testNoUncategorizedMethods-false-positives #10785 https://github.com/pharo-project/pharo/pull/10785 - AST-Tag-Abstract-classes #10783 https://github.com/pharo-project/pharo/pull/10783 - chore: Define baseline of TaskIt for Pharo 10 #10799 https://github.com/pharo-project/pharo/pull/10799 - Using "adding-removing" instead of "adding/removing" #10622 https://github.com/pharo-project/pharo/pull/10622 - Cleanup-canBeExecutedInContext #10784 https://github.com/pharo-project/pharo/pull/10784 - NewValueHolder extracted to its own baseline #10763 https://github.com/pharo-project/pharo/pull/10763 - Updated Fuel to 3.0.4 #10513 https://github.com/pharo-project/pharo/pull/10513 - Cleanup-gtInspectorAllVariablesIn #10809 https://github.com/pharo-project/pharo/pull/10809

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This week (03/2022) on the Pharo Issue Tracker MD
by Marcus Denker Jan. 21, 2022

Jan. 21, 2022

We merged 22 PRs and closed 22 Issues this week. Bug Fixes ========= - Fixes #10702 Printing method selector in windows title only if the selector is not nil #10713 https://github.com/pharo-project/pharo/pull/10713 - CmdCommand-isAbstract-check #10770 https://github.com/pharo-project/pharo/pull/10770 - Skip-testSNIPage #10771 https://github.com/pharo-project/pharo/pull/10771 - TFFI not compatible to UFFI - missing #tfPointerAddress on Integer #10738 https://github.com/pharo-project/pharo/pull/10738 - Enh/better expansion for non fluid #10759 https://github.com/pharo-project/pharo/pull/10759 - Fixes #10747 adding a shortcut to expand class definition. Thanks Denis. #10757 https://github.com/pharo-project/pharo/pull/10757 - Fixes #10253 adding new fetcher for selectors. #10717 https://github.com/pharo-project/pharo/pull/10717 - Use double click on the left bar to install a breakpoint in the browser #10736 https://github.com/pharo-project/pharo/pull/10736 Spec2 ===== - 10721-Porting-ExternalBrowser-to-Spec2-and-remove-Spec1-version #10776 https://github.com/pharo-project/pharo/pull/10776 - Move FontChooser to NewTools #10709 https://github.com/pharo-project/pharo/pull/10709 - 10720-Porting-WatchesWindow-to-Spec2-and-remove-Spec1-version #10761 https://github.com/pharo-project/pharo/pull/10761 - 10719-Porting-TestReviver-to-Spec2-and-remove-Spec1-version #10762 https://github.com/pharo-project/pharo/pull/10762 Cleanups ======== - Fix-DeprecationRewrites #10772 https://github.com/pharo-project/pharo/pull/10772 - Cleanup newlines and blanks in "Random" packages #10743 https://github.com/pharo-project/pharo/pull/10743 - Cleanup newlines and blanks in "Refactoring" packages #10745 https://github.com/pharo-project/pharo/pull/10745 - Cleanup newlines and blanks in "ReflectionMirrors" packages #10751 https://github.com/pharo-project/pharo/pull/10751 - 10730 Update comments kernel wrt responsibilities/behavior #10728 https://github.com/pharo-project/pharo/pull/10728 - Cleanup newlines and blanks in "Reflectivity" packages #10753 https://github.com/pharo-project/pharo/pull/10753 - Cleanup newlines and blanks in "Regex" packages #10755 https://github.com/pharo-project/pharo/pull/10755 - Do not use deprecated method in ClyNotebookPageMorph>>#initialize #10749 https://github.com/pharo-project/pharo/pull/10749 - Remove temporarily documentation reader #10734 https://github.com/pharo-project/pharo/pull/10734 Pharo 9 ======= - Backport Fix #10253 Adding new fetcher for selectors. #10718 https://github.com/pharo-project/pharo/pull/10718

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This week (02/2022) on the Pharo Issue Tracker
by Marcus Denker Jan. 17, 2022

Jan. 17, 2022

For more infos, see https://github.com/pharo-project/pharo/pulse Fixes ===== - MC Warning - Add #versions Getter #10696 https://github.com/pharo-project/pharo/pull/10696 - Fixes #10702 Printing method selector in windows title only if the selector is not nil #10713 https://github.com/pharo-project/pharo/pull/10713 - Integrate Roassal3 v0.9.9d #10716 https://github.com/pharo-project/pharo/pull/10716 - 10703-Collectionflattened-changed-semantics #10705 https://github.com/pharo-project/pharo/pull/10705 - 10678-Step-Over-fails-for-leaving-simple-accessors #10707 https://github.com/pharo-project/pharo/pull/10707 - Fixes #10673 by adding missing method method to display a MessageTally identified #10682 https://github.com/pharo-project/pharo/pull/10682 - use DoubleByteLayout and DoubleWordLayout #9792 https://github.com/pharo-project/pharo/pull/9792 Image Building ============== - align commit of external projects with its merged version #10697 https://github.com/pharo-project/pharo/pull/10697 - Updating bootstrap image to v1.7.8 #10694 https://github.com/pharo-project/pharo/pull/10694 Cleanup ======= - Fix-deprecated-hostWindowTitle #10711 https://github.com/pharo-project/pharo/pull/10711 - 10331-No-need-to-refer-to-transcript-in-executable-comments #10706 https://github.com/pharo-project/pharo/pull/10706 Comments ======== - fixes #10704. changed Random>>nextInt: to nextInteger: in class comments #10710 https://github.com/pharo-project/pharo/pull/10710

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Re: Helping with documentation
by stephane ducasse Jan. 14, 2022

Jan. 14, 2022

> On 12 Jan 2022, at 02:03, Jimmie Houchin <jlhouchin(a)gmail.com> wrote: > > I am going to be working my way through some Pharo docs. > > As I read the books I sometimes see some English that can be improved. Yes I noticed it too but Iâm running too fast and my english is not my native language so it is not good. > > What is the proper procedure for doing so? > > Any pointers to documents to help with this greatly appreciated. Oh this is easy just send small PRs and I will read and integrate them. Thanks in advance because this is important to get better documentation. S > > > Thanks. > > > Jimmie

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Pharo VM Release - v9.0.11
by tesonep＠gmail.com Jan. 13, 2022

Jan. 13, 2022

Hello, I have released a new version of the Pharo VM for Pharo 9 and Pharo 10. This VM is accessible right now from Zero-Conf, updating it in the Pharo Launcher or using the usual downloads (as described in pharo.org/download) This version includes a series of minor bug fixes. Changelog: - Include FloatArrayPlugin in the build - Updating SDL2 to 2.0.18 for OSX X86_64 - Using Pharo 10 image as VMMaker image - Fixing issue in message counting on non-JIT VM Thanks a lot, and any doubt please let me know. Cheers, Pablo on behalf of the whole Pharo team. -- Pablo Tesone. tesonep(a)gmail.com

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