Squeak-dev September 1998

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108 participants
197 discussions

Controller loops
by vuletich＠ar.ibm.com 08 Sep '98

08 Sep '98

To: squeak(a)cs.uiuc.edu cc: From: Hello everybody. We know that Squeak uses all the available CPU time even when it is not doing anything. I have seen that in Squeak there is a background process that runs: --------------------------------------------------------- ProcessorScheduler>>idleProcess "A default background process which is invisible." [true] whileTrue: [self relinquishProcessorForMicroseconds: 1000]. --------------------------------------------------------- But this process is never executed because there is always a higher priority Controller process running. In the method: ------------------------------------------------------ Controller>>controlLoop "Sent by Controller|startUp as part of the standard control sequence. Controller|controlLoop sends the message Controller|isControlActive to test for loop termination. As long as true is returned, the loop continues. When false is returned, the loop ends. Each time through the loop, the message Controller|controlActivity is sent." [self isControlActive] whileTrue: [self controlActivity. Processor yield] ------------------------------------------------------- the Processor yield can be changed for (Delay forMilliseconds:50) wait. This makes the MVC controllers poll for activity no more than 20 times a second, what is perfectly enough. I found that this frees almost all the processor time to other programs in a multitasking OS. All that is needed is to have the ioRelinquishProcessorForMicroseconds() function in the VM properly implemented. I tried it and works OK in Windows and OS/2 versions of Squeak. The same should be done in ScrollController>>scroll. It can also be done in MorphWorldController >>controlLoop, but Morphic prefers to to have its step intervals as short as possible. Does this modification deserve to be in the base image? Juan Manuel Vuletich jvuletic(a)dc.uba.ar

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Re: Controller loops
by Tim Olson 08 Sep '98

08 Sep '98

>>Personally, I think the best solution would be to go to an event >>driven model. The basic problem is polling, events would take >>care of it. > >Interesting idea. How could this be done? > >Let's assume an architecture, that uses "widget" objects and "model" >objects. A widget is the combination of view and controller. As the view, >it's a dependent of the model. Widgets will react to events, implementing >the GUI. An event-driven architecture already exists; namely Morphic. It currently interfaces with the polled Squeak interface through HandMorph>>processEvents, which continuously generates Morphic events, but it should be relatively easy to push the Morphic event interface down through to the VM, generating these only when the actual action occurs. -- tim

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Re: Announce: New port of Squeak to Zaurus
by Tim Rowledge 08 Sep '98

08 Sep '98

On Mon 07 Sep, ohshima(a)is.titech.ac.jp wrote: > I've been porting Squeak to the (japanese domestic version > of) Zaurus PDA, and I just released a tentative version. Welcome to the porters club! -- Fractured Idiom:- MAZEL TON - Lots of luck Tim Rowledge: rowledge(a)interval.com (w) +1 (650) 842-6110 (w) tim(a)sumeru.stanford.edu (h) <http://sumeru.stanford.edu/tim>

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Re: Bug in Integer?
by Christopher Oliver 08 Sep '98

08 Sep '98

----- Forwarded message from Travis or Kerrin Griggs <tkc(a)bmi.net> ----- -4 / 1000000000000000 The clearest example I find is: (2 raisedTo: 30) quo: (2 raisedTo: 30) negated The numerator is a small LargePositiveInteger, and the denominator is the most negative SmallInteger. Ok, here 'tis I think. >From LargePositiveInteger(Integer)>>quo: quo: aNumber "Refer to the comment in Number quo: " | ng quo | aNumber isInteger ifTrue: [ng _ self negative == aNumber negative == false. quo _ (self digitDiv: aNumber neg: ng) at: 1. ^ quo normalize] ifFalse: [^ (aNumber adaptInteger: self) quo: aNumber adaptToInteger] The difficulty is that digitDiv: wants to digitLshift the denominator, but this relies on the determining the high bit which is undefined for negative SmallIntegers. Since we've determined the sign when we computed ng, could we send the absolute value when we're given a SmallInteger? quo: aNumber "Refer to the comment in Number quo: " | ng quo denom | aNumber isInteger ifTrue: [ng _ self negative == aNumber negative == false. (aNumber isMemberOf: SmallInteger) ifTrue: [ denom _ aNumber abs ] ifFalse: [ denom _ aNumber ]. quo _ (self digitDiv: denom neg: ng) at: 1. ^ quo normalize] ifFalse: [^ (aNumber adaptInteger: self) quo: aNumber adaptToInteger] Please be kind with the tomatoes! -- Christopher Oliver Traverse Internet Systems Coordinator 223 Grandview Pkwy, Suite 108 oliver(a)traverse.net Traverse City, Michigan, 49684 "What good is a can of worms if you never open it?" -Bob Arning

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Re: Controller loops
by Terry Raymond 07 Sep '98

07 Sep '98

On Mon, 07 Sep 1998 15:26:26 +0200, Stefan Matthias Aust wrote: >A system event dispatcher will retrieve these VM events, process and >dispatch them. It'll listen to all movement events, determining the active >window widget, sending a "mouse entered" to that widget. It's now the >responsibilty of the window widget to react. The window might register >itself as the active window. Key events are always forwared to the active >window (if there's one). The window will then forward the key to the widget >which currently has the focus. > >This has to be detailed, but it seems to be strait forward. > >But how to deal with concurrent processes? Any ideas? I think that for each windowing application there should be a separate process and event handler. Dialogs generated by an application would use the app's process and event handler. This approach would make each application look like a standard OS application. One immediate advantage would be that if an application hangs the entire image will not hang. Terry Raymond Crafted Smalltalk (401) 846-6573 http://www.craftedsmalltalk.com

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Re: Controller loops
by Gaston Dombiak 07 Sep '98

07 Sep '98

Sorry....I tried to reply to other mail ;-( -- Gato "Gaston Dombiak" <dombiak_gaston @ jpmorgan.com> on 09/07/98 10:34:57 AM Please respond to squeak(a)cs.uiuc.edu To: squeak @ cs.uiuc.edu cc: (Gaston Dombiak) Subject: Re: Controller loops gracias -- Gato

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Re: Controller loops
by Gaston Dombiak 07 Sep '98

07 Sep '98

gracias -- Gato

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Re: Controller loops
by Terry Raymond 07 Sep '98

07 Sep '98

On Sun, 6 Sep 1998 00:55:06 -0700 (PDT), Lex Spoon wrote: > >In MVC, it's not so simple: there are busy loops all over the place. >It's generally assumed that everything other than the current >activity, is sitting static. In addition to Controller.controlLoop, >there are seperate loops for menus, scrolling, resizing various >things, and others. Personally, I think the best solution would be to go to an event driven model. The basic problem is polling, events would take care of it. Terry Raymond Crafted Smalltalk (401) 846-6573 http://www.craftedsmalltalk.com

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Re: Convex hulls
by ocit.inc 06 Sep '98

06 Sep '98

The convex hull of a set of points is the smallest convex set that contains the points. What I meant by "convex hull algorithm" was the algorithm that determined the convex polygon given the above definition. There is a lot of material and source code out there mainly in C . There are also some Java applets. Somebody in this discussion group had distributed code for Voronoi diagrams and I thought that perhaps the same person might have something in Squeak for convex hulls. Charles OCIT -----Original Message----- From: Alessandro Manunza <manunza(a)elettro1.unica.it> To: squeak(a)cs.uiuc.edu <squeak(a)cs.uiuc.edu> Date: Friday, September 04, 1998 3:29 AM Subject: R: Convex hulls Hi, excuse me, what is a "convex hull algorithm "? Thanks Alessandro ---------- > Da: ocit.inc <ocit.inc(a)MCI2000.com> > A: squeak(a)cs.uiuc.edu > Oggetto: Convex hulls > Data: venerdì 4 settembre 1998 6.56 > > I am on the verge of attempting to implement an ST version of a convex hull > algorithm however I'm kind of busy at the moment and would prefer to borrow > one. > > Can anybody help? > > Thanks. > > Charles > >

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Re: Windoze-2-1-1.cs coming soon
by Pennell 05 Sep '98

05 Sep '98

Thanks!! I was attempting to try it out this week and couldn't find a late model version. And I second the request for Reiner's enhancements. I've grown quite comfortable with the Squeak look and feel over time, but I think this will help me sell it to some of my unbelieving coleagues. -david -----Original Message----- From: Sam Adams <ssadams(a)us.ibm.com> To: squeak(a)cs.uiuc.edu <squeak(a)cs.uiuc.edu> Date: Friday, September 04, 1998 5:47 PM Subject: Windoze-2-1-1.cs coming soon >Squeakers, >I have ported Windoze-1-3-4 to Version 2.1 and uploaded it to UIUC. >All of an afternoon's work. I really like the new pluggable views framework. >Should take a couple od days to show up. >Perhaps Reinier van Loon will soon port all his enhancements as well! >Regards, >Sam > >Sam S. Adams, Distinguished Engineer, IBM Network Computing Software Division >tie line 444-0736, outside 919-254-0736, email: ssadams(a)us.ibm.com ><<Hebrews 11:6, Proverbs 3:5-6, Romans 1:16-17, I Corinthians 1:10>> > >

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