Squeak-dev June 1999

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139 participants
408 discussions

QUESTION: Squeak for Solaris
by kaplan＠cs.clemson.edu 02 Jun '99

02 Jun '99

I recently heard Alan Kay's talk about Squeak at ICSE in LA. I tried to download the Solaris version, but the links appear to either be broken and/or out of date. Can someone send me a "live" link for the Solaris port? Thanks! Alan

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Morphic Doc
by Ashley George Taylor 02 Jun '99

02 Jun '99

Can I get some basic info on classes like HandMorph, WorldMorph and the ProjectViewMorph? I know what the basic intent of each of these is, e.g. HandMorph handles and redirects input, but I still don't have a clean idea of how the event processing model works and the exact role of the classes involved, and I don't function well by slodging through code. I finally read "Directness and Liveness in the Morphic User Interface Construction Environment" by John Maloney and Randall Smith in UIST '95, which gives an excellent overview of the Morphic architecture philosophy, layout implementation and animation architecture. The UIST '95 paper discusses Morphic as originated in Self, and some changes have been made since it has been ported to Squeak. For example, the event handling architecture is not discussed in detail, and the windowing system and projects are not discussed at all. I'm trying to write a little paper for a UI class to compare Morphic Architecture/UIToolkit to MVC and to other UI toolkits such as Swing. The reason I chose to do this was to get a clearer idea of the scene myself. -Ashley George Taylor (ataylor(a)cc.gatech.edu)

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Newbies Wanted
by Ted K. 02 Jun '99

02 Jun '99

Folks, I've just posted a new tutorial for Newbies who are trying to learn Squeak. It starts at the beginning, and takes you through defining a class and writing some methods. Please give this tutorial a try, and email me <tedk(a)wdi.disney.com> with anything you have trouble with. The Squeak BankAccount tutorial by John Maloney. http://minnow.cc.gatech.edu/SqueakDoc.42 Thanks! --Ted. Ted Kaehler, Walt Disney Imagineering, R&D (home) 3415 Cork Oak Way, Palo Alto, CA 94303. voice (650) 424-1070 http://www.webPage.com/~kaehler2/ Remember, we are the lowest form of intelligence that can do this sort of thing.

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Exception handling & memory problem
by Giovanni Giorgi 01 Jun '99

01 Jun '99

Excuse me, I am new to Squeak, but I have used a lot VisualWorks 3.0 & 2.5 There is an exception handling mechanism in Squeak? If so, where is it? (I search for signal class, Exception class....but I don't found them) If there isn't, I can build a small try-catch clone for Squeak....as a goodie... Do you think it will be a good idea? Last but not least, I' d like to enlarge the memory space of Squeak (at the moment I am running out of memory :( ) How can I do it? I must use a special switch on invoking Squeak? I am using Squeak under Windows. thank you very much! -- // Giovanni Giorgi e-mail: giovanni.giorgi(a)mlab.disco.unimi.it // Master Thesis at http://mars.sal.disco.unimi.it/~giorgi // Student & (ex)Tutor at Depart. of Computer Science of Milan, Italy.

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networking
by Vandendriessche, Frederik 01 Jun '99

01 Jun '99

Hello fellow squeakers, I have two questions/problems to share with all of you. (How many are we allready ??) Both are network related, I think. 1) Using the PWS I sometimes (up to 4 times a day) get the following in the error-box : ---------- CreateThread() failed (8) -- Not enough storage is available to process this command. SetThreadPriority() failed (6) -- The handle is invalid. ---------- 2) I just started using the SMTPSocket, and succeed in sending myself an email, but I always get : -------- Send thread was not closed upon socket destroy -------- Causes and/or solutions to these problems ? -Any- reaction is welcome, here or in my mailbox ! Frederik Vandendriessche * frederik.vandendriessche(a)eds.com * ..32/0 2 711 37 83 ---------------------------------------- First they ignore you. Then they laugh at you. Than they fight you. Then you win. -- Gandhi ----------------------------------------

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Re: Exception handling & memory problem
by Peter Smet 01 Jun '99

01 Jun '99

Hi, There is an exception handling framework for Squeak available at: http://www.netjam.org/self/projects/smalltalk/exceptionHandling.html It was done by Craig Latta and appears to be very good (I havent used it yet). Let the list know if you find it useful... Peter

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[Q] GIFReadWriter as plugin?
by Reinier van Loon 01 Jun '99

01 Jun '99

Folks, has anyone tried to pluginise the GIFReadWriter? The ST implementation is a bit slow when it comes to (ahem) larger gif files. I used the CCodeGenerator but the C code has references to ReadStream and now I am not sure what to do next. So, before investing a lot of time, I'd better ask. Any help appreciated. Cheers, Reinier.

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Fw: [ENH] Re: Publish-Subscribe
by Peter Smet 01 Jun '99

01 Jun '99

>Shaping, (or should I call you bigfoot :-) > >That's interesting, because the initialize method has no critical >sections. > >Before you set the default variable to nil, it is a good >idea to remove it from WeakArray: >WeakArray removeWeakDependent: self default. >default := nil. >(assuming this is a class method). >I have just added a reset method that does this... > >I am glad you pointed this out, since Singletons should not >really have a #new method for clients to call. I have fixed >this by letting PostOffice control all instance creation, >and disabling PostOffice new. > >re Subscribers building up. I have noticed this only when the >FinalizationProcess has come to a halt or been interupted. >Check this by inspecting WeakArray FinalizationProcess. >In the normal test, there should be hundreds of fluctuating nils >in the publishers array - this is normal..... > >PS my latest version did not have a reset method. Are you using an >earlier version? Or did you add the method? PostOffice is now >subclassed from Object rather than WeakRegistry - this seemed >to fix some synchronization problems. > >I have attached the most recent version, which I really hope will fix >these concurrency issues.... > >PostOffice now uses Bob Arning's RecursiveSemaphore, (thanks very >much for this Bob) and the tests are all running well. This semaphore is >better >than the one I hacked together, since it implements signal and wait, and >can so be substituted transparently for a normal Semaphore. My Semaphore >only implemented critical (both implementations seemed to work fine). > >On the weekend, I had the PostOffice duplicating all the changed update: >protocol by changing addDependent: to route the messages appropriately. >It didnt crash during that. > >I think the next step in making things more robust is to use Tim's >exceptions >to ensure all semaphores stay in a consistent state, no matter how they are >broken out of. (something like valueNowOrOnUnwindDo). > >PS Please also test things on a clean image to see if the errors remain. > >Peter > > > >>Regarding your latest: if you reset PostOffice's default variable to nil >>(using a #reset method), and then evaluate PostOffice>>new, the system >locks >>up in the critical section during PO initialize. Any ideas? >>Also, I've have seen in the previous version odd finalization behvior in >>which subscribers started to build up, and could only be finalized by >>saving, quiting and restarting the image. >> >> >>Shaping >> >> > Content-Type: application/octet-stream; name="Publish-Subscribe.1June1009am.cs" Content-Disposition: attachment; filename="Publish-Subscribe.1June1009am.cs" Attachment converted: Anon:Publish-Subscribe.1June1009am.c (????/----) (0000A84A)

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