Squeak-dev July 2006

squeak-dev@lists.squeakfoundation.org

132 participants
241 discussions

Saving the image in the background
by Damien Cassou 31 Jul '06

31 Jul '06

Hi, I would like to know if the following code is safe: [SmalltalkImage current snapshot: true andQuit: false] forkAt: Processor userBackgroundPriority Is there any problem if the main process modifies something in the same time ? Thank you

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Code Generation
by Keith R. Fieldhouse 31 Jul '06

31 Jul '06

Hello, For a project I have in mind, I'd like to do some in-image code generation. I actually do this quite a bit in other languages for one reason and another but it seems as though it'd be a somewhat different beast inside a Squeak image. So, of the various packages available on SqueakMap/SqueakSource/Monticello is there one that you'd consider a good example of code generation techniques with Squeak? Or is there something already in the image that's worth looking at? I'm interested in generating new classes and methods on both sides. Something that uses some sort of templating facility would be interesting as well. Thanks for your help, Keith

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REMINDER: Squeak Chat Tuesday August 1st 04:00 GMT
by Ken Causey 31 Jul '06

31 Jul '06

Just a reminder that the next Squeak Chat will take place between 04:00 (4 AM) and 08:00 (8 AM) GMT Tuesday August 1st, 2006. As usual we will meet in #squeak on irc.freenode.net. More information about the #squeak IRC channel can be found at http://people.squeakfoundation.org/article/7.html This is a good time to contribute to the development of Squeak by participating in the Harvesting Process. One of the main ways to contribute is by Reviewing submitted fixes and enhancements. For information about the Harvesting Process see http://minnow.cc.gatech.edu/squeak/3152 If you have the time please attend and work toward the future of Squeak. The next seven chats are scheduled for 08:00 (08:00 AM) GMT Saturday August 05, 2006 12:00 (12:00 PM) GMT Wednesday August 09, 2006 16:00 (04:00 PM) GMT Sunday August 13, 2006 20:00 (08:00 PM) GMT Thursday August 17, 2006 00:00 (12:00 AM) GMT Tuesday August 22, 2006 04:00 (04:00 AM) GMT Saturday August 26, 2006 08:00 (08:00 AM) GMT Wednesday August 30, 2006

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RE: Saving the image in the background
by Peter Crowther 31 Jul '06

31 Jul '06

> From: Damien Cassou > I would like to know if the following code is safe: > > [SmalltalkImage current snapshot: true andQuit: false] > forkAt: Processor userBackgroundPriority > > Is there any problem if the main process modifies something > in the same time ? In general it is not safe. Code before the snapshot puts a number of objects into a state suitable for recovery after the image restarts, and code after the snapshot restores them. You also are forking at userBackgroundPriority, which means that the system's tidy-up before a snapshot and recovery after a snapshot could be pre-empted by your own processes, so you might get errors in the main process from a freshly-started image that has only partly recovered when restarted. Your specific case may not trigger any of the problems - follow the code through the various hooks to see what is affected. - Peter

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Re: Saving the image in the background
by Gerardo Richarte 31 Jul '06

31 Jul '06

Damien dijo: > I would like to know if the following code is safe: > > [SmalltalkImage current snapshot: true andQuit: false] > forkAt: Processor userBackgroundPriority > > Is there any problem if the main process modifies something in the same > time ? > > The problems have already explained, and I've been following this thread with great interest, because a "similar" problem we have is to find a way to save the image doing everything from Squeak (suppose you want, for example, to "save" the image over the net, using FTP, implementing the FTP protocol in Squeak: the image will be changing while you do the networking stuff) The solution we came up to, and until somebody finds a better way (please do!), is to make a copy of the image in a String or ByteArray (from a primitive). This will effectively duplicate the size of the image, but so far, is the only solution we found. This trick may apply to your case, depending on what you really want to put in background, but as Klaus said, if you want to put the garbage collection in background, you cannot do it by forking a Squeak process, as this is a natively atomic operation, and the same goes for storing the bits in a file. This two can only be forked natively. Any better ideas? please?! :-) gera

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re: table-layout
by Niko Schwarz 30 Jul '06

30 Jul '06

Thank you for your answers! I found out that chessmorph does nearly what I want. I was able to modify it to meet my needs. TableLayout is not a real table-layout, its more a "wrap-layout". niko -- Echte DSL-Flatrate dauerhaft für 0,- Euro*. Nur noch kurze Zeit! "Feel free" mit GMX DSL: http://www.gmx.net/de/go/dsl

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TableLayout , organizing four buttons in a square
by Niko Schwarz 30 Jul '06

30 Jul '06

Hello, I'm trying to achieve a simple layout, only that I keep failing. Since I don't understand table-layout I tried to bypass it by calling extent: on my submorphs, but ... it does not work very properly. I put two buttons in a Morph, two buttons in another Morph and then put the two morphs together into a third morph. I'd prefer to live with only one holder Morph as it would make things tidier. I also don't understand how I can convince all Buttons to have the same width and height (I see that "justified" does that, but of course ONLY if I can live with one holder morph only). So, basically, what I need to know is: how do I tell the table layout how many rows and columns I want? niko -- Echte DSL-Flatrate dauerhaft für 0,- Euro*. Nur noch kurze Zeit! "Feel free" mit GMX DSL: http://www.gmx.net/de/go/dsl

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Squeak Maintainence and Condensed Sources
by Peace Jerome 30 Jul '06

30 Jul '06

Squeak Maintainence and Condensed Sources Hi Marcus, Thank you for your first reply to Condensed Sources vs. Squeak Maintainence To restate the essesnce of my concern: I believe a great deal of code will rot and squeak will become a lot more fragile than it already is if you compress sources now in the process of finalizing 3.9. I understand your concern about the changes file going over its limit. I also understand the great deal of effort you and stef have put it to 3.9 to date. And that getting things done has largely relied on your time and effort. Easy to implement solutions would be appreciated I imagine? First the task of getting a 3.10 with all changes from 3.9 would start with '3.9a with all changes from 3.0' that Doug Way (bless his heart) produced after I said please three times in one post. Second condensed sources should come at the beginning of an alpha cycle not at an end. So one alternative is to condense sources with the first version of 3.9 alpha (or the 3.8 version just before that name change. And produce a 3.9 with all changes from 3.8 (condensed) source. That would not be as nice but it would at least be acceptable. The full changes versions have never been for users they have been for developers. Their usefulness is very high or I wouldnt be trying so hard to make my point. A code history project is both far in the future and risky (it might not come off). Do you really want Squeak maintainence to limp along until when and if it comes about? The easier you make it for me (and others) to find the bugs the quicker, better, and more permanently we can fix them. You and Stef have been given arbitrary authority to determine how 3.9 gets made. The consequences of how you choose to use that authority and what decisions you make affects the whole community. I see several of those decisions as increasing the brittleness of squeak and I am voicing my concerns. I ask only that you do your best to address them. Yours in service, -- Jerome Peace __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Squeak 1.1 with APS2 license
by Robert Kovacic 30 Jul '06

30 Jul '06

>From a recent post on Squeak-dev mailing list - "Apple has given Viewpoints permission to make a release of the original public Squeak system using the Apple Public Source License[1]. Squeak 1.1, with an APSL2 license, is available here: http://squeakland.org/installers/Squeak1.1-APSL.zip". This address has been giving me a "page cannot be found". Is this zip file available anywhere else? Regards, Robert Kovacic

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[OT] Looking for "self includes: Smalltalk" (Mario Wolczko)
by Diego Gomez Deck 30 Jul '06

30 Jul '06

Anyone can help me? Cheers. -- Diego

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