Squeak-dev September 1999

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133 participants
357 discussions

RE: Multithreaded Squeak WAS: RE: [ENH] Empty return expression
by Michael Klein 29 Sep '99

29 Sep '99

On Tuesday, September 28, 1999 12:30 PM, Stephen Pair [SMTP:spair@advantive.com] wrote: > Not that I am aware. Making Smalltalk multi-threaded is tricky. Some > Smalltalks have taken the approach of making the "Process" concept in > Smalltalk equate one-for-one with OS threads. I think that approach is very > bad. First, it's difficult to implement, and second, it's inefficient > because you have the additional overhead of the OS context switching. Elliot Miranda on c.l.s. a while back also pointed out that this make the VM's scheduling behavior dependant on the OS, and makes it unreproducable. From Elliot Miranda at : http://www.dejanews.com/[ST_rn=ps]/getdoc.xp?AN=387224637 On a side-note related to reliability, I belive Java has saddled itself with a real albatross in being natively multi-threaded. A natively multi-threaded VM *isn't* repeatable, period. And that means its *very* difficult to debug VM bugs. It's kind of nice knowing that context switching can occur only at well defined points. In Squeak, that would be Interpreter >># checkForInterrupts I like Travis' idea of mapping OS threads to Smalltalk ProcessSchedulers. Hmmm. [RelativelyLongIndepentantTask startUp] forkOn: ProcessScheduer new. Also, there was a book a while ago on Concurrent Smalltalk. It was pretty interesting. http://www.amazon.com/exec/obidos/ASIN/9810201125/onlinetoday/ ISBN: 9810201125 Design and Implementation of Concurrent Smalltalk (World Scientific Series in Computer Science, Vol 21) by Yasuhiko Yokote

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Re: Squeak on handheld?
by Edward P Luwish 28 Sep '99

28 Sep '99

Actually, this project is what got me involved in the Squeak porting effort to begin with. When the linux-7k folks started discussing GUIs, a number of candidates came up (I originally proposed Tcl/Tk because of the large body of portable applications) and someone mentioned Squeak. Because I have been involved with Smalltalk for years, I didn't know why I hadn't thought of it first - not only is it a GUI, but a development system and a quick way to implement all the PDA applications that I would lose by switching from EPOC to Linux. However, the current state of linux-7k is not robust enough to support Squeak, in my opinion. It doesn't boot reliably and, like you, I am not thrilled to risk wiping my C: drive clean. Some folks have reported having to take all the batteries out of the Psion and let it stand overnight in order to recover from a lock-up. Even if I had a second Psion to play with, I would want the operating system to at least be stable enough to let me distinguish between an OS failure and a Squeak failure. All things considered, I think EPOC Squeak would be more likely to be downloaded and installed than linux-7k Squeak because it can coexist with the PDA applications. For testing purposes (and Squeak evangelism) we need to appeal to the largest possible audience. Ed Dean_Swan(a)Mitel.COM wrote: > > P.S. Tim: Have you and Ed thought of trying Linux 7k? I've thought about it, > but I'd have to get another machine, as it doesn't peacefully coexist with an > EPOC environment, and I just depend on EPOC too much.

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[Enh] Improved PPT to BookMorph
by Mark Guzdial 28 Sep '99

28 Sep '99

At http://guzdial.cc.gatech.edu/squeakers/PPTtoBook.cs is an improved version of the PowerPoint to BookMorph package that was included in the last 2.6 updates. This version uses the nifty-cool new color picker which lets you see the changes immediately and browse colors. (Thanks to Dan for leading me to the new version.) Mark -------------------------- Mark Guzdial : Georgia Tech : College of Computing : Atlanta, GA 30332-0280 (404) 894-5618 : Fax (404) 894-0673 : guzdial(a)cc.gatech.edu http://www.cc.gatech.edu/gvu/people/Faculty/Mark.Guzdial.html

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Multithreaded Squeak WAS: RE: [ENH] Empty return expression
by Carl Gundel 28 Sep '99

28 Sep '99

>From: "Stephen Pair" <spair(a)advantive.com> >Subject: RE: [ENH] Empty return expression >Date: Mon, 27 Sep 1999 20:08:12 -0400 <big snip> >And, InstructionStreams are really the fundamental unit of processing and >should take much of the responsibility currently held in Process. >Especially when considering how one would architect a Squeak that takes >advantage of multi-processor CPUs. Is such work underway? My intuition tells me that this would be related to implementation of a Smalltalk which would be multithreaded on a single CPU (which would be great). -Carl ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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Re: [ANN] OSProcess version 0.3 for Squeak
by Peter William Lount 28 Sep '99

28 Sep '99

Hi David, The web page seems to be gone or the server at gatech.edu is down. Is there an alternate site? Peter William Lount peter(a)smalltalk.org http://www.smalltalk.org ---------- From: David T. Lewis <lewis(a)mail.msen.com> I have posted a new version of OSProcess for Squeak on the swiki at: http://minnow.cc.gatech.edu/squeak.708 I think that this version is fairly solid now. I'd appreciate feedback from anyone who may be using it.

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[bug] [fix (? partial)] B3Dmorph no longer works
by Mark Guzdial 28 Sep '99

28 Sep '99

Playing around with Squeak 2.6a, I found that B3Dmorph (from the New Morph menu) no longer worked. Thinking that it might be an exceptions thingie, I then tried 2.5. Didn't work there either! The problem seems to be that the B3Dmorph no longer has a texture when it's first told to draw itself, so it bombs when nil is asked to be asTexture. The below fix just generates a form and uses that as the texture. I do it inside of initialize. Don't know if it's the right fix, but it works now. However, the set texture menu item on B3Dmorph still doesn't work. 'From Squeak 2.5 of August 6, 1999 on 28 September 1999 at 10:19:52 am'! !B3DMorph methodsFor: 'initialize' stamp: 'mjg 9/28/1999 10:19'! initialize super initialize. geometry _ B3DBox from: (-0.7@-0.7@-0.7) to: (0.7@0.7@0.7). camera _ B3DCamera new. (self confirm:'Put me into a clipping frame?') ifTrue:[camera position: 0@0@1.5] ifFalse:[camera position: 0@0@2. color _ nil]. camera nearDistance: 0.1. camera farDistance: 5.0. self extent: 100@100. texture _ (Form extent: 100@100) asTexture. angle _ 0.! ! -------------------------- Mark Guzdial : Georgia Tech : College of Computing : Atlanta, GA 30332-0280 (404) 894-5618 : Fax (404) 894-0673 : guzdial(a)cc.gatech.edu http://www.cc.gatech.edu/gvu/people/Faculty/Mark.Guzdial.html

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[BUG][FIX] anyModifierKeyPressed still uses macOptionKeyPressed
by Alexander Lazarevic 28 Sep '99

28 Sep '99

Content-Type: text/plain; charset=us-ascii Content-Description: message body text Content-Transfer-Encoding: 7bit Subject says it all. Just a small fix. Alex. Content-Type: text/plain Content-Description: makes anyModifierKeyPressed to use yellowButtonPressed Content-Disposition: inline; filename="MorphicEvent-anyModifierKeyPressed.st" Content-Transfer-Encoding: 7bit 'From Squeak 2.5 of August 6, 1999 [latest update: #1498] on 28 September 1999 at 8:08:03 am'! !MorphicEvent methodsFor: 'keyboard' stamp: 'laza 9/28/1999 08:01'! anyModifierKeyPressed "ignore, however, the shift keys 'cause that's not REALLY a command key " ^ (self commandKeyPressed or: [self controlKeyPressed]) or: [self yellowButtonPressed]! ! 'From Squeak 2.5 of August 6, 1999 [latest update: #1498] on 28 September 1999 at 8:16:14 am'! !InputSensor methodsFor: 'modifier keys' stamp: 'laza 9/28/1999 08:16'! anyModifierKeyPressed "ignore, however, the shift keys 'cause that's not REALLY a command key" ^ ((self commandKeyPressed or: [self controlKeyPressed]) or: [self yellowButtonPressed])! ! Content-Type: text/plain; charset=us-ascii Content-Description: .signature Content-Transfer-Encoding: 7bit -- ------ Alexander Lazarevic ------------------------------------------------ -- Otto-von-Guericke-Universitaet mailto: Alexander(a)Lazarevic.de -- -- Computational Visualistics http://www.cs.uni-magdeburg.de/~lazarevi --

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Re: [UPDATES] 22 more for 2.6 test pilots
by Andrew C. Greenberg 28 Sep '99

28 Sep '99

> 1. Andrew Greenberg's new primitive compiler requires the >TestOSAPlugin. > It's fantastic -- really works to drive AppleScript! Thanks for the plug. Just to be clear, however, the plugin is only necessary if you wish to use the Applescript -- it is the OSAPlugin that depends upon the new primitive compiler, not vice-versa.

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[FIX] 1483ListItemSelect-JLM
by Jason McVay 28 Sep '99

28 Sep '99

there was one tiny bug that i had to squash... 'From Squeak 2.5 of August 6, 1999 on 28 September 1999 at 12:58:51 am'! !PluggableListMorph methodsFor: 'model access' stamp: 'JLM 9/26/1999 23:34'! keyStroke: event "Process potential command keys" | args aChar aLowercaseChar oldSelection aSpecialKey nextSelection nextSelectionList nextSelectionText max howManyItemsShowing | aChar _ event keyCharacter. (event anyModifierKeyPressed or: [self listHandlesBasicKeys not]) ifTrue: [keystrokeActionSelector == nil ifTrue: [^ nil]. (args _ keystrokeActionSelector numArgs) = 1 ifTrue: [^ model perform: keystrokeActionSelector with: aChar]. args = 2 ifTrue: [^ model perform: keystrokeActionSelector with: aChar with: self]. ^ self error: 'The keystrokeActionSelector must be a 1- or 2-keyword symbol']. oldSelection _ self selectionIndex. nextSelection _ oldSelection. aSpecialKey _ aChar asciiValue. max _ self maximumSelection. aSpecialKey < 32 ifTrue: [" one of a number of special keys" aSpecialKey == 31 ifTrue: [" down arrow" nextSelection _ oldSelection + 1. nextSelection > max ifTrue: [nextSelection _ 1]]. aSpecialKey == 30 ifTrue: [" up arrow" nextSelection _ oldSelection - 1. nextSelection < 1 ifTrue: [nextSelection _ max]]. aSpecialKey == 1 ifTrue: [" home" nextSelection _ 1]. aSpecialKey == 4 ifTrue: [" end" nextSelection _ max]. howManyItemsShowing _ self numSelectionsInView. aSpecialKey == 11 ifTrue: [" page up" nextSelection _ 1 max: oldSelection - howManyItemsShowing]. aSpecialKey == 12 ifTrue: [" page down" nextSelection _ oldSelection + howManyItemsShowing min: max]. ^ self changeModelSelection: nextSelection]. aLowercaseChar _ aChar asLowercase. nextSelectionList _ list copyFrom: oldSelection + 1 to: max. nextSelectionList addAll: (list copyFrom: 1 to: oldSelection). " make sure to get rid of blanks due to the hierarchal nature of some of the collection entries" nextSelectionText _ nextSelectionList detect: [:a | (a asString withBlanksTrimmed at: 1) asLowercase == aLowercaseChar] ifNone: [nextSelectionText _ nil]. nextSelectionText ~~ nil ifTrue: [nextSelection _ list findFirst: [:a | a == nextSelectionText]. ^ self changeModelSelection: nextSelection] ifFalse: [self flash]! !

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RE: Squeak on handheld?
by John Tobler 28 Sep '99

28 Sep '99

Your message misattributed certain remarks to me. I do not work for HP, I have no experience with a Journada 820, and I do not endorse WinCE. The material you quoted was from a response to a message from me that started this thread. Me? I just want some little doohickie I can carry with me that can contain and run a reasonably complete Squeak image, including Morphic, so that I can improve my knowledge of Squeak and maybe use it to edit some little code snippets once in awhile. Oh, and I'd like to spend maybe $300 or so for this capability. I am still looking to assemble a list of handheld devices capable of supporting Squeak. I was hoping people would list the various devices on which they have managed to get Squeak working, to some degree or other. If such a list emerges, I'd like to make sure it gets posted to a Swiki page somewhere. John Tobler -----Original Message----- From: Frank Berthold Sent: Mon, 27 Sep 1999 22:02:22 -0400 To: squeak(a)cs.uiuc.edu Subject: RE: Squeak on handheld? > -----Original Message----- > From: Marc Nijdam [mailto:marc_nijdam@hp.com] > Sent: Thursday, September 23, 1999 6:57 PM > To: squeakie(a)visto.com > Cc: squeak(a)cs.uiuc.edu > Subject: Re: Squeak on handheld? > > > "John Tobler" <squeakie(a)visto.com> writes: > > Not to promote stuff from my employer... but did you > consider the Jornada 820. > [...snip...] _______________________________________________________ Get Visto! Groups, event calendars, email, and more... Check it out @ http://www.visto.com/info

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