- Pharo-dev - lists.pharo.org

[Pharo-project] External objects and finalization
by Schwab,Wilhelm K April 4, 2010

April 4, 2010

Andreas, You mentioned that all handles are cleared on startup. Is there a convenient way to tap into that for executors for external objects? Bill

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[Pharo-project] Mondrian: present and future
by Alexandre Bergel April 3, 2010

April 3, 2010

Hi All, Just to give some news about Mondrian. Together with colleagues from Bern, Lille and Santiago, I have been working on this visualization engine for quite some times. Although it contains some important bugs (e.g., popupView) it is fairly stable and usable. The current version is 2.0-beta.7. Mondrian is slowly maturing. A short summary of the discussion I had with Doru and StÃ©phane today. Some of the features I would like to see in for Version 3.0 are: - scalable spring layout (also known as force based layout): this is a very simple and nice layout that produces amazing results - add layers: embedding a rendering or a part of it in a layer. Layers could then be iteratively activated and desactivared. The idea is to enable the construction of scripts in a very iterative and incremental way. - having a small core embeddable in your application - making Mondrian load graphiz scripts - having a better help system (Ã la ProfStef) - dedicated chapter for Pharo By Example Volume 2 - exporting as PDF - anti-aliasing This probably will not happen today or tomorrow, but I just feel necessary to share this roadmap with you. Some other features are wanted. Using Rome is one. Open GL is another. There are plenty of rooms for a very cool visualization engine. Probably during the holiday period I will consolidate the current version by fixing remaining bugs and produce 2.0. Bug tracker: http://code.google.com/p/moose-technology/ Web page: http://www.moosetechnology.org/tools/mondrian Let's render our dream! Cheers, Alexandre NB: sorry for this cross mailing list post. -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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[Pharo-project] FFI - structure pointer
by Schwab,Wilhelm K April 3, 2010

April 3, 2010

Andreas, John, anybody, I need to find the address of a "function" (it is in fact a global structure pointer somewhere in memory) and pass it to another function. Suppose the structure is called Type and the function allocate_one(). I call the function something like allocateOne:type size:anInt <cdecl: SomeOtherStruct* 'allocate_one' ( Type* long ) > but I am having an awful time getting the pointer to Type. Given that dlsym() will return a pointer to it, how can I represent that in Smalltalk? I have tried variations on "Indirectly call dlsym()" address := Library default getProcAddress:'name_of_global_struct'. "try to create Type* from the resulting address" type := Type fromHandle:address. type := Type fromHandle:address getHandle. type := ExternalData fromHandle:address type:Type externalType asPointerType. Something := Library default allocateOne:type size:2. and it either complains about bad arguments during the call or segment faults. Any ideas or similar examples? Bill

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[Pharo-project] CodeCritics questions
by HernÃ¡n Morales Durand April 3, 2010

April 3, 2010

Hi, For Code Critics in OB users, if you select Refactor -> Code critics, the lint checks starts automatically.... -But it seems to start in background on all image? (the toolbar says "on Smalltalk") instead of the selected class category in the OB. It is probably a bug? -There is a percentage indicator but I don't know if refers to the currently selected lint category or all lints plus transformations... -It would be cool to start the lints on demand in a selected category? What do you think? Cheers, HernÃ¡n

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[Pharo-project] Collection
by stephane ducasse April 3, 2010

April 3, 2010

Hi guys tristan is a new student here and he would like to work on collection optimization and implementation. I would like the get some ideas from you. - are there some collections that would be cool to improve? - are there some collections that would be cool to have and that we do not have yet? If you have any idea related to optimizations let me know. Stef

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[Pharo-project] squeakToUTF-8 and related?
by StÃ©phane Ducasse April 3, 2010

April 3, 2010

Hi I'm trying to remember the situation with the internal representation of string in pharo/squeak to revise http://book.seaside.st/book/in-action/serving-files/character-encodings/sea… I saw that in pharo we have this NonASCIIMap. I do not remember what have been done in pharo. Argh memory leaks.... Nicolas do you remember the situation? In this context what is the squeakToUTF8 related behavior? is squeak still using latin-1 or in the midst of changing? Stef

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[Pharo-project] [FFI] ExternalStructure ownership (or not) of memory
by Schwab,Wilhelm K April 3, 2010

April 3, 2010

Hello all, Suppose I have a pointer to a structure and I do or do not have the responsibility of reclaiming the memory when a corresponding ExternalStructure sub-instance is finalized. How do I distinguish the two cases? One idea I had is to explicitly set the handle to nil if I do not own the memory, but (please correct me if I'm wrong), I can't do that while I'm still using the instance because it will presumably use the handle in accessing the fields, right? Looking at implementors of #isExternalAddress, maybe the idea is to use a byte array to make a copy of memory and an address to refer to it. What should I be asking? :) Bill

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April 2, 2010

I decided to learn something new this evening so I started to read and write tests about URI Now I have a question testRelativeAuthority "self debug: #testRelativeAuthority" | uri relativeURIString | "A relative URI with authority. relative uri does not start with a scheme:." relativeURIString := '//www.pharo-project.org'. uri := URI fromString: relativeURIString. >>> self assert: (uri asString = relativeURIString). Is false because uri asString = 'www.pharo-project.org' and not '//www.pharo-project.org' self deny: (uri isAbsolute). self assert: (uri isRelative). self assert: (uri authority asString = 'www.pharo-project.org'). self deny: (uri isOpaque). So does anybody know what is correct? Similarly testRelativeEmptyAuthority "self debug: #testRelativeEmptyAuthority" | uri uriString | uriString := '//'. "A relative URI with empty (but defined) authority." uri := URI fromString: uriString. self assert: (uri asString = uriString). >>> '' versus '//' self deny: (uri isAbsolute). self deny: (uri authority isNil). self deny: (uri isOpaque). Thanks

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[Pharo-project] Compiling the VM
by Hilaire Fernandes April 2, 2010

April 2, 2010

I have some unmet dependency I can't resolve. I can't find information about the required -dev packages to install. Hilaire -- Configuring squeak 3.11.13-2135 for i686-pc-linux-gnu -- Using source directory ../unix/src -- Setting CFLAGS to -O2 -- internalplugins: UUIDPlugin -- externalplugins: ADPCMCodecPlugin AsynchFilePlugin B3DAcceleratorPlugin Squeak3D BMPReadWriterPlugin B2DPlugin BitBltPlugin CroquetPlugin DSAPrims ZipPlugin DropPlugin SqueakFFIPrims FFTPlugin FT2Plugin FileCopyPlugin FilePlugin FloatArrayPlugin FloatMathPlugin GeniePlugin HostWindowPlugin JPEGReadWriter2Plugin JPEGReaderPlugin JoystickTabletPlugin Klatt LargeIntegers LocalePlugin MIDIPlugin Matrix2x3Plugin MiscPrimitivePlugin Mpeg3Plugin QuicktimePlugin RePlugin SecurityPlugin SerialPlugin SocketPlugin SoundCodecPrims SoundGenerationPlugin SoundPlugin StarSqueakPlugin SurfacePlugin AioPlugin UnixOSProcessPlugin XDisplayControlPlugin -- Using CFLAGS -O2 -- UUIDPlugin: /usr/include/uuid/uuid.h -- UUIDPlugin: /usr/lib/libuuid.so !! B3DAcceleratorPlugin disabled -- Loaded CMakeASMInformation - ASM support is still experimental, please report issues -- checking for module 'freetype2' -- package 'freetype2' not found !! FT2Plugin disabled !! HostWindowPlugin disabled -- Mpeg3Plugin: /usr/lib/libpthread.so -- SocketPlugin: libsocket not found -- SocketPlugin: /usr/lib/libnsl.so -- UnixOSProcessPlugin: /usr/lib/libpthread.so !! XDisplayControlPlugin disabled -- vm-sound-ALSA: /usr/include/alsa/asoundlib.h -- vm-sound-ALSA: /usr/lib/libasound.so !! vm-display-Quartz disabled !! vm-sound-MacOSX disabled !! vm-display-X11 disabled -- vm-display-fbdev: /usr/include/linux/fb.h -- vm-sound-pulse: libpulse-simple not found !! vm-sound-pulse disabled -- vm-sound-NAS: audio/audio.h not found -- vm-sound-NAS: libaudio not found !! vm-sound-NAS disabled -- vm-sound-OSS: /usr/include/alsa/asoundlib.h -- vm-sound-OSS: /usr/lib/libasound.so -- vm-sound-Sun: sys/audioio.h not found -- vm-sound-Sun: sun/audioio.h not found -- vm-sound-Sun: /usr/include/stropts.h !! vm-sound-Sun disabled -- Configuring done -- Generating done -- Build files have been written to: /home/hilaire/Travaux/pharo/Squeak-3.11.3.2135-pharo-src/build

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[Pharo-project] FW: dlopen: I'm stumped
by Schwab,Wilhelm K April 2, 2010

April 2, 2010

Sorry for any duplication, but this should be visible by now (I think). -----Original Message----- From: Schwab,Wilhelm K Sent: Friday, April 02, 2010 7:24 AM To: squeak-dev(a)lists.squeakfoundation.org; pharo-project(a)lists.gforge.inria.fr Subject: dlopen: I'm stumped Hello all, Attached is my attempt at calling dlopen() from Pharo, and it is not going well. The C code below works as expected, so the problem has to be either in my code or something in Pharo or the VM itself. I am fairly certain that loading the attached is safe, but DynamicLinkingLibrary getProcAddress:'cos' from:'libm.so'. crashes the vm in my experience. Any ideas? Bill /* http://www.unix.com/man-page/All/3/dlopen/ Build as: gcc -rdynamic -o fubar fubar.c -ldl */ #include <stdio.h> #include <stdlib.h> #include <dlfcn.h> int main(int argc, char **argv) { void *handle; double (*cosine)(double); char *error; handle = dlopen("libm.so", RTLD_LAZY); if (!handle) { fprintf(stderr, "%s\n", dlerror()); exit(EXIT_FAILURE); } dlerror(); /* Clear any existing error */ /* Writing: cosine = (double (*)(double)) dlsym(handle, "cos"); would seem more natural, but the C99 standard leaves casting from "void *" to a function pointer undefined. The assignment used below is the POSIX.1-2003 (Technical Corrigendum 1) workaround; see the Rationale for the POSIX specification of dlsym(). */ *(void **) (&cosine) = dlsym(handle, "cos"); if ((error = dlerror()) != NULL) { fprintf(stderr, "%s\n", error); exit(EXIT_FAILURE); } printf("%f\n", (*cosine)(2.0)); dlclose(handle); exit(EXIT_SUCCESS); }

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