Squeak-dev October 1998

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Train Garbage Collector
by Alejandro F. Reimondo 31 Oct '98

31 Oct '98

Hi all, Are there any public implementation of the Train Algorithm GC for old spaces? Ale.

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Re: Squeaking the web....and security issues...and BeOS stuff
by johnm＠wdi.disney.com 31 Oct '98

31 Oct '98

"Steve Harris" <sharris(a)thinktankinc.com> wrote: > I am planning on building a version that using the netscape > plug-in api. this should make it much easier to port between platforms, I did this about two years ago, and you should find most of the hooks for it in the Mac source file sqMacWindow.c. The basic idea was to run the Squeak VM for some number of bytecodes on each "idle" event provided by the Netscape browser. (Pluggins run as user event handlers that are expected to return control to the browser fairly quickly--say, within half a second.) One problem with this approach was that the mechanism to count the bytecodes slowed down the bytecode dispatch considerably--by a factor of two, as I recall! A better approach might be to use a timer interrupt to tell the VM when to return control to the browser. Do you have any thoughts on how to handle this problem? -- John P.S. I believe that the Netscape plug-in API is supported by IE as well as Netscape, so I agree that using this API is a much more portable approach to making Squeak a plug-in than ActiveX. But it could be that having Squeak run under ActiveX has other applications. (I don't use Windows much, so I'm not sure what a Squeak ActiveX control might be used for. Could you embed a Squeak application in a Word document? Control Squeak from another application?)

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Re: Pool dictionaries
by glenn 31 Oct '98

31 Oct '98

Craig, Juanita's article (http://www.smalltalksystems.com/publications/pools.doc) covers a lot of the problems. glenn At 06:08 PM 10/29/98 -0800, Craig Latta wrote: > >> Of course, there are those (including me) who have argued for years that >> pools and pool dictionaries are a bogosity that needs to be >> removed/replaced, but that's another story. > > I'd like to hear that one. > > > thanks! > >-C > > >-- >Craig Latta >composer and computer scientist >craig.latta(a)netjam.org >www.netjam.org >latta(a)interval.com >Smalltalkers do: [:it | All with: Class, (And love: it)] > > >

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Re: CrLfFileStream as default?
by lex＠cc.gatech.edu 31 Oct '98

31 Oct '98

"R. A. Harmon" <harmonra(a)webname.com> wrote: > I think with the following proposed set of conventions that PILT could be > effectively achieved and the odd "bite" handled on a case by case basis in > some standard way. > > - Internally all lines end with a carriage return and contain no other > interline spacing (carriage return, form feed, line feed, and > vertical tab). > - External text lines end with the platform default unless explicitly > set to some other line end. > - External binary lines must deal explicitly with interline spacing > characters. > - External text is the open default. > - All objects that have lines and internal stuff that depends on them > (like Text string and runs) must have conversion methods for > internal to external and back if used made external. > - You run into something that doesn't follow the convention, send in > a fix > or at least point it out. This sounds basically like what CrLfFileStream does, if you set it as the default concreteStream. For binary files, it does nothing: you're on your own. For "ascii" files, it converts CR, LF, and CRLF into CR on input, and it saves output according to some consistent external convention. The overall effect is that for ascii-mode files, internal strings have CR's, and external files have whatever the platform convention is. UNLESS, the user is dealing with file positions. If the external file has CRLF's in it, then a single character internally can become two characters externally. So what should happen to "the" file position? One answer, the way it is done right now, is to let "the position" jump by more than 1. This is basically what ANSI C does with text files. Another answer, would be to calculate a "virtual position" and map that back and forth to the actual file. This can require reading the entire beginnig of a file, though, and sucks for large files. It's very clean though. Or yet another answer, is to simply disable messing with file positions for ascii files. If you really care about file positions, then maybe you are dealing with a binary file that happens to contain text? The second is upwardly compatible from the third solution. Once you start down the path of positions not making sense, you get stuck with it. So basically it's a chaice between the first way (easy, but with lower semantics) and the second+third way (hard, but you shouldn't be doing it), and then a choice as to whether saying you can't do it is acceptible. So in my opinion, the only things stopping adoption of CrLfFileStream as a default are: 1. a decision on the file positions issue (I vote for "it's illegal", migrating towards "it's expensive and unadvised") 2. automatically choosing output line endings based on what the current platform is. This could be done by putting a "CrLfFileStream guessLineEndConvention" in SystemDictionary.processStartupList. Oh, and maybe it could be renamed, too. CrLf isn't very descriptive, especially on a Unix machine that doesn't have any CrLf delimitted files. "TextFileStream", maybe? Lex

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Re: FYI: Microsoft Universal VM to Challange Java
by johnm＠wdi.disney.com 30 Oct '98

30 Oct '98

wirth(a)almaden.ibm.com wrote: > "... in a little-noticed move, Microsoft acquired Colusa Software Inc. in > 1996. Colusa makes OmniVM, a multiple-language virtual machine." > http://www.zdnet.com/intweek/stories/prtarchivestory/0,4356,367513,00.html Interesting. That could be where Microsoft got their first Java VM. The timing seems just about perfect. -- John

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debugger
by Jerry Jackson 30 Oct '98

30 Oct '98

Brian Klump's response to my debugger question made me realize that the debugger was, in fact, intended to operate as I expected. So, when I went home I tried it again and realized that what was happening was that the display was not being updated on a "step". If I deselected the stack frame then reselected it, the highlight would be updated to the current location. I was using Squeak 2.0 but now I've tried using the debugger in 2.2 and it works as expected. Was this a known bug in 2.0? Sorry about the confusion. --Jerry Jackson

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RE: Newbie ebugger questions
by Bolot Kerimbaev 30 Oct '98

30 Oct '98

On Oct 22, 1998 Dan Ingalls posted a note: |A year ago I put ObjectTracer and ObjectViewer into Squeak. Less than a page of code with |a lot of power. They let you implement exactly this kind of wrapper behavior if you want |to. There are no frills, but if you want to do this kind of tracing, they make it pretty |easy. | | - Dan Hope this helps Bolot > What is the way to trace the execution of a 'program'. I would really > like to be able to watch the progression of message sends to get a > better idea of how things work together. > > John-Reed Maffeo

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Re: HELP: Squeak went unstable running PWS.
by johnm＠wdi.disney.com 30 Oct '98

30 Oct '98

John: We believe that both Squeak 2.2 and PWS are stable under Win95. There was a problem with PWS, but it was fixed in an update. Try the following: 1. get and unpack the Squeak 2.2 release, including the 2.2 virtual machine 2. start the image and fetch all updates using the "update code from server" command in the "help..." menu 3. save the updated image 4. start up PWS using this image Let me know if you still have problems. -- John "John Fletcher" <J.P.Fletcher(a)aston.ac.uk> wrote: > I am running Squeak 2.0 on Windows 95 OSR2, mainly to run the PWS > server. I have been running this for some time, as I when also > mounter version 2.1 it seemed to give no advantages, and I am > waiting for a stable 2.2/PWS combination. > > The problem is that the Squeak image stopped responding to mouse > clicks, so that I could not start up the PWS server, or do anything > else. > > It was not the computer system, as the 2.1 Squeak ran O.K.

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newbie question: how to generate c code with squeak?
by zhao.jia.wei 30 Oct '98

30 Oct '98

I have downloaded the four files needed to run squeak, which are: Squeak2.2.changes SqueakVM-2.2-i686-linux-2.0.35 Squeak2.2.image SqueakV2.sources .. Can I generate c code with there how files present, or is there anything more needed? Thanks. /best regards, zhao jiawei

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Swiki PWS
by rapp＠lmr.com 30 Oct '98

30 Oct '98

Having been inspired by the "Birds of a Feather" session at OOPSLA in Vancouver, my associate and I decided to setup a swiki server at our company to provide a place to discuss the experience. There is an addition to the instructions that might help others. When you click on the link for how to setup, it tells you to get the page from Mark's site, then modify the path, then PWS initializeAll, and then SwikiAction setUp:.. That's fine, but it doesn't start the server! We started it by PWS serveOnPort: 80 loggingTo: 'Squeak.log'. Assuming that's correct (it does seem to work), that final, critical step should be added to the instructions. Larry -- rapp(a)lmr.com

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