Squeak-dev August 2006

squeak-dev@lists.squeakfoundation.org

151 participants
220 discussions

>>finalize questions
by Michael van der Gulik 27 Aug '06

27 Aug '06

Hi all. Two questions for today. --------- 1. What does Object>>finalize do? It appears not to do much at all. I had a quick poke at the VM source (but not enough to grok what's happening). It appears to only be used for weak references or something? I made a test class (Dunce) and implemented: finalize Transcript show: 'finalize called..'. but the Transcript remains blank even lots of "Dunce new" and then "Dunce instanceCount" (returns 1). Also, "w := WeakArray with: (Dunce new)" doesn't call finalize either... ----------- 2. I have an object with a process "in" it. How can I make sure that process is terminated when there are no more references to that object? I assume processes are automagically added to the garbage collector's root pointer collection, preventing that object from being garbage collected. i.e.: Dunce>>aProcess [ [ self doSomeCleanUpAndWait5Seconds ] repeat ] forkNamed: 'Silly process'. Michael vdG.

3 8

An MC challenge: As a practical matter what size package is best when using MC.
by Peace Jerome 27 Aug '06

27 Aug '06

In the context of maintaining squeak as packages: -What is the largest practical package to store (and load) as an MC package. -What is the smallest practical package to store separately (and load) as an MC package. You can name whatever parameter for size that you want. (Bytes, Classes, Messages, Or Class>>Methods ) The practical aspect is in terms of resources. Programmer time mostly. But this is affected by how much memory the image has to have allocated to it to successfully load the package. I early on tried to save Morphic as a package (even before it was split) with time consuming and then disastorous results. (My iMac has about 100M allocated to squeak.) Even maxing out the allocation ( which for my resources stopped at ~200M) just used up more time for no greater result. So I am of the learning that MC does (or at least didn't) scale well. On what scale does it work admirably. On what scales does it fail to work well? Yours in curiosity, -- Jerome Peace __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

3 2

Re: Domaining using classes.
by Klaus D. Witzel 27 Aug '06

27 Aug '06

Hi Alex, can we keep this discussion thread in squeak-dev (and if so then please don't reply just to me). On Thu, 24 Aug 2006 10:55:40 +0200, Alexandre Bergel wrote: >> Domain a and domain b have precisely the same superclass (oop). So the >> answer is: always the right one, since there exists only one >> implementor. > > It means that a client is always in one (and only one) domain. How those > domains are composed each other ? > > For instance, a short example of a class Person that has two domains: > employee and student. Initially, "domaining using classes" has only a Person class. This class (and all other classes in the same image) belong to the single #system domain by default. When an #employee domain or #student domain is created, instances of Person become member of the respective domain as follows: employeePerson := (Person clone nowYouClonedClassBelongsToDomain: #employee) new. studentPerson := (Person clone nowYouClonedClassBelongsToDomain: #student) new. Observe when and where #new is executed. Then, (employeePerson domain) printIt => #employee (studentPerson domain) printIt => #student (employeePerson class) printIt => 'a Person in domain #employee' (studentPerson class) printIt => 'a Person in domain #student' > Person>>employeeDomain.salary > ^ 2000 > > Person>>studentDomain.nbOfCoursesTaken > ^ 4 > > Easy. I think that our subject "domaining using classes" does not have such methods. The methods do not change when domain membership becomes effective (i.e. do not have the domainName. prefix from your examples), they change neither automagically nor manually. > the method salary can be invoked by an object x only if x "is" in a > domain employee. Same thing for nbOfCourseTaken. > > Imagine now the few methods: > > "Public methods" > Person>>employeeDomain.printString > ^ self printOn: (WriteStream on: String new). > > Person>>studentDomain.printString > ^ self printOn: (WriteStream on: String new). > > > Person>>printOn: stream > self generalInfo printOn: steram "CRITICAL QUESTION HERE" > self description printOn: stream "CRITICAL QUESTION HERE" > > Person>>employeeDomain.description > "Description for being an employee" An instance of Person in domain #employee does not have the "is an employeePerson" property. Instead, it has the "my class belongs to the #employee domain" property. This implies that the "domained" Person instance belong the their class' domain. > Person>>employeeDomain. generalInfo > "Description for being an employee" Same as above. > Person>>studentDomain.description > "Description for being a student" Same as above with s/employee/student/. > Person>>studentDomain. generalInfo > "Description for being a student" Same as above with s/employee/student/. > printOn: is not part of any domain (or belongs to a 'default' domain). > When printOn: is invoked, how do you know the right method to select ? Since we have "just" clones of classes, we always select the right method, because only that one method exists? > What does it mean to "be" in a domain ? Any class can be cloned and the clone is added to a domain (a domain has an identifier and a collection of members, i.e. a collection of cloned classes). Instances of a domained class belong to their class' domain. > I am really interested by this discussion! :) /Klaus > cheers, > Alexandre

3 3

Scripting syntax: all expressions or declarations?
by Damien Pollet 27 Aug '06

27 Aug '06

Hi, We were discussing options to adapt the smalltalk syntax to write code in files. The main problem is that methods in smalltalk are parsed separately, and the method patterns won't fit if we are to put several method declarations in a single file. - Stef prefers a dedicated declarative syntax (like the one of Pepsi, and that would indeed be nice to be compatible and not invent yet another nearly identical syntax) - I'm more fond of an "everything is an expression" syntax, so a source file would just be a big doIt in regular syntax with messages like #subclass:instanceVariables: or #>> and probably a extended block syntax to give them selectors. Do you know any discussions about this part of language design? I like the all-expression way because it feels more interactive, but we will probably need to abuse the smalltalk syntax to make it really practical/concise... -- Damien Pollet type less, do more

9 19

[ANN] Exupery 0.08 now released.
by Bryce Kampjes 27 Aug '06

27 Aug '06

Exupery can now compile blocks and super sends. More information is here: http://minnow.cc.gatech.edu/squeak/Exupery Bryce

3 3

Some comparisons between Squeak versions: (MethodContexts)
by Peace Jerome 26 Aug '06

26 Aug '06

Hi Craig, > >some comparisons between Squeak versions >Craig Latta craig at netjam.org >Sat Aug 26 16:34:03 UTC 2006 wrote: >Hi Peace-- > > Each non-meta class has a method dictionary and a metaclass, which >has its own method dictionary. So there are supposed to be two method >dictionaries for each non-meta class. Yep. That was my second guess. So what about the dictionarys above the 2*class number? > > Why do you want to count MethodContexts? The number of them varies >significantly from moment to moment as the system runs, so any static >count isn't very meaningful. It corresponds very roughly to the number >of existing processes in the system, but not so well that I'd even >bother comparing that figure between different versions of Squeak. Well, ignorance is a wonderful thing. It makes you curious about stuff that if you knew what you were doing might not be interesting. I'm still wondering if the number of MethodContexts hanging around at the beginning (of a fresh image) are significant of something more. The difference in number was curious. I started this quest out of a curiosity to see what squeak was made of (a megabyte here a megabyte there and pretty soon your talking real memory). So it became interesting to track anything with more than 1K instances. And then I got curious to compare versions to see if the numbers had changed dramatically or not. The results seemed interesting enough to publish on squeak-dev. I hope to get enough feedback to start looking at more significantly interesting stuff next iteration. Cheers -- Jer __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

1 0

RE: Some camparisons between squeak versions.
by Peter Crowther 26 Aug '06

26 Aug '06

> From: stéphane ducasse > Decrease you mean? Increase - the more recent image is at the top. - Peter > On 26 août 06, at 12:50, Alexandre Bergel wrote: > > >> Sq7054 > >> #('CompiledMethod 44834 > >> ' 'MethodDictionary 4108 > >> ' 'MethodContext 4170 > >> ' 'Class 2037 > >> ') > >> > >> sq6665 (3.8) > >> #('CompiledMethod 47792 > >> ' 'MethodDictionary 3612 > >> ' 'MethodContext 1352 > >> ' 'Class 1668 > >> ') > > > > > > Anyone has an explanation for the huge increase of MethodContext > > instances?

1 0

Squeak Chat Wednesday August 30th 08:00 GMT
by Ken Causey 26 Aug '06

26 Aug '06

Just a reminder that the next Squeak Chat will take place between 08:00 (8 AM) and 12:00 (Noon) GMT Wednesday August 30th, 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 12:00 (12:00 PM) GMT Sunday September 03, 2006 16:00 (04:00 PM) GMT Thursday September 07, 2006 20:00 (08:00 PM) GMT Monday September 11, 2006 00:00 (12:00 AM) GMT Saturday September 16, 2006 04:00 (04:00 AM) GMT Wednesday September 20, 2006 08:00 (08:00 AM) GMT Sunday September 24, 2006 12:00 (12:00 PM) GMT Thursday September 28, 2006

1 0

Re: A bug with pointSize?
by Peace Jerome 26 Aug '06

26 Aug '06

Q: Is it a bug? A: Depends. What would you classify as a bug. The code itself is poorly documented and the method is unfortunately named. StrikeFont familyName: (f0 name) size: (f0 height) is the correct choice. So maybe it should be StrikeFont familyName: (f0 name) height: (f0 height) Try evaluating: ( { (f0 :=TextStyle defaultFont) . ( fHeight := ( StrikeFont familyName: (f0 name) size: (f0 height))). ( fPixel := ( StrikeFont familyName: (f0 name) size: (f0 pixelSize))). ( fPoint := ( StrikeFont familyName: (f0 name) size: (f0 pointSize ))). } collect: [ :font | (font asString, ' height=', font height printString , ' pixelSize=', font pixelSize printString , ' pointSize=', font pointSize printString , ' ') ] ) explore "Javier Diaz-Reinoso" <javier_diaz_r at mac.com> wrote: > Is this a bug?: > f0:=TextStyle defaultFont. > p0:=f0 pointSize. > > f1:=(StrikeFont familyName: (f0 name) size: (f0 pointSize)). > p1:=f1 pointSize. > > f0 asString, ' p0=', p0 asString, ' ', f1 asString, ' p1=', p1 asString > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

1 0

Outliner
by Pavel Krivanek 25 Aug '06

25 Aug '06

Hi all, I've got the next toy for you :-) It's couple of months when I was doing something with Marvin (the Self dialect for Squeak). But there's one part of this project that was never published and that may be interesting for you - the prototype of the Self-like outliner. It's stand-alone code so it's not dependent on the rest of this project. You can download it here: http://squeaksource.com/Marvin/Marvin-Outliner-pk.1.mcz and it looks like this: http://www.comtalk.net/Squeak/uploads/95/outliner.PNG You can create some outliners using this code o := MarvinOutliner for: MarvinOtlObjectAbstractModel new. o flyTo: 100@100. Then you can create slots, create sections of slots, open evaluator, move slots from one outliner to another, create new object from slots and so on. But connectors are not working well now and if I remember it well, the code needs some cleanup. In fact Marvin is not absolutely dead project (the public repository doesn't contain the latest version) but SmaCC doesn't have some features that I need for working with source code and clone families so I need to write new compiler and I don't have enough time for it now. Enjoy! -- Pavel

2 7

← Newer
1
2
3
4
5
6
7
8
...
22
Older →

Jump to page: