- Pharo-dev - lists.pharo.org

Re: [Pharo-dev] [Vm-dev] [ANN] ARM Stack VMs available

by Chris Muller

On Fri, Dec 5, 2014 at 11:39 AM, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > > Hi Juan, > > > On Dec 5, 2014, at 4:56 AM, "J. Vuletich (mail lists)" > <juanlists(a)jvuletich.org> wrote: > >> Hi Folks, >> >> The Squeak process scheduler usually preempts a process only by another one of higher priority. And when the scheduler is ready to go back at the lower priority, it will always resume the same process that was last suspended. The only way for two or more processes of the same priority to share the processor is when the running process calls #wait or #yield. > > No. According to the blue book preempting sends the preempted process > to the back if its run queue so preempting forces a yield. Obviously > this is wrong, but that's the way it was defined. The ObjectWorks & > VisualWorks VMs changed this to work as you describe. Why is that wrong? By sending it to the back, one gets task-switching that acts like real "multitasking" as one would expect in a real multitasking system, without the developer having to put in explicit sends to #yield. Keeping it at the front "enables" multi-processing code to be developed incorrectly so that, one day, when it might ever get to a real multitasking environment, it won't work and it'll be harder to debug since by then its old and probably more complex. #yield is not a good synchronization tool..

Dec. 6, 2014

Re: [Pharo-dev] Repeatable VM crash

by Eliot Miranda

Hi Hilaire, I see you found me :-). Thanks, I'll take a look asap. Probably Monday. On Sat, Dec 6, 2014 at 12:05 AM, Hilaire <hilaire(a)drgeo.eu> wrote: > Le 05/12/2014 22:37, Eliot Miranda a Ã©crit : > > Hi Hilaire, > > > > can you try and concoct an image that crashes from start-up without > > operator intervention? What I mean is that if the expression that > > crashes is the one you give then in a workspace evaluate > > > > Please, give me an email to send privately an URL? > > Thanks > > Hilaire > > > -- > Dr. Geo - http://drgeo.eu > iStoa - http://istoa.drgeo.eu > > > -- best, Eliot

Dec. 6, 2014

Re: [Pharo-dev] Repeatable VM crash

by Eliot Miranda

Hi Esteban, plausibly the fix to the latest VM might fix your crash. You might test? Fingers crossed. On Fri, Dec 5, 2014 at 11:26 PM, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > yes, but the first step is to be sure you have the latest vm version :) > > Esteban > > > On 05 Dec 2014, at 22:37, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > > Hi Hilaire, > > can you try and concoct an image that crashes from start-up without > operator intervention? What I mean is that if the expression that crashes > is the one you give then in a workspace evaluate > > Smalltalk snapshot: true andQuit: true. > (CGDonator firstname: 'Eric' lastname: 'Dupont') = (CGParticipant firstname: > 'Eric' lastname: 'Dupont') > > and then run the saved image. If it crashes then its really easy to debug > because it will be repeatable. If one has to interact with the image > debugging is much more difficult. > > On Fri, Dec 5, 2014 at 1:07 PM, Hilaire <hilaire(a)drgeo.eu> wrote: > >> Hi again, >> >> I must add it occurs from a test or when comparing something like this >> in the Workspace: >> >> (CGDonator firstname: 'Eric' lastname: 'Dupont') = (CGParticipant >> firstname: 'Eric' lastname: 'Dupont') >> >> I get a false returned value printed in the Workspace, then VM crash. >> >> Thanks >> >> Hilaire >> >> >> Le 05/12/2014 21:35, Hilaire a Ã©crit : >> > When playing with equality in a class hierarchy I have repeatable VM >> crash. >> > It is today Pharo VM 3.9-7 from Jenkins and Pharo3. >> > >> > Am I using an out of date VM? >> > >> > Crashdump enclosed >> > >> > Hilaire >> > >> > >> >> >> -- >> Dr. Geo - http://drgeo.eu >> iStoa - http://istoa.drgeo.eu >> >> >> > > > -- > best, > Eliot > > > -- best, Eliot

Dec. 6, 2014

New Cog VMs available

by Eliot Miranda

... at http://www.mirandabanda.org/files/Cog/VM/VM.r3163/. CogVM binaries as per VMMaker.oscog-eem.972/r3163 Fix a devilishly tricky bug with 32-bit Spur and PICs in the Cogit. In 32-bit Spur only zero is a valid cache tag, that for Characters, due to SmallIntegers having both 2r11 and 2r01 as valid tags. The cache check prolog collapses these down onto 1 by anding with 1 and hence collapses Character's 2r10 to 0. The cache tag is also tested in the PIC abort routine to distinguish between an MNU abort and an interpret abort. A PIC MNU entry jumps to code that first zeros the cache tag (held in ClassReg) before calling the abort routine, which tests ClassReg and selects the relevant abort processing. Hence in 32-bit Spur if a send site is linked for Character and later extended to a PIC with an interpret case, that interpret case will instead invoke MNU processing. This is rare; first there needs to be a send to a CHaracter, then a send to something else which binds to something that must be interpreted. Ouch. The fix is simple; if a send site that was linked with a zero cache tag (which can only happen in 32-bit Spur) link to an open PIC instead of to a closed PIC, or in the case of an MNU do not link. Add a debug lookup routine that only looks up (and follows forwarding pointers). Add a -breakmnu vm argument that calls warning on an mnu of a specific selector. Fix SmartSyntaxPlugin code generation for Spur of - asOop: old code assumed 4 byte oops & headers - Unsigned old code assumed 32-bit oops Affects AsyncFilePlugin, BochsIA32Plugin & FT2Plgin. Avoid duplication of effort in special selector send forwarding fault handling. Improve stack trace printing for Newspeak and Glue by providing something that assumes the penultimate literal is the selector or an AdditionalMethodState-like thing containing it. Reimplement primitiveCopyObject to work for both pointer and bits objects. This to support a good Object>>clone for Spur. Fix Spur's isWordsOrBytes[NonImm]:. Old code answered true for CompiledMethods. -- best, Eliot

Dec. 6, 2014

Re: [Pharo-dev] How can I specify the bindings when evaluating an expression?

by Nicolai Hess

2014-12-06 11:18 GMT+01:00 Marcus Denker <marcus.denker(a)inria.fr>: > > > On 05 Dec 2014, at 15:18, stepharo <stepharo(a)free.fr> wrote: > > > > I would like to be able to express > > > > Compiler new > > bindings: { a -> 3. b -> 4}; > > evaluate: 'a + b'; > > result > > and get 7 > > > > How can I do that? > > > > Not directly, as evaluate is just a doitâ¦ but it can be added > as the machinery is there for evaluating in context in the debugger. > > I will have a look but not this weekend. > > Marcus > > > The easiest solution I have found: Smalltalk compiler evaluate:'a+b' notifying: (Dictionary newFrom:{ WorkspaceVariable key:#a value:3. WorkspaceVariable key:#b value:4}) logged:nil The dictionary is used as the receiver for the call to #bindingOf: and WorkspaceVariable acts like a LiteralVariable that implements emitValue/emitStore nicolai

Dec. 6, 2014

Re: [Pharo-dev] Problem copy pasting from internet browser to GTPlayground

by Sven Van Caekenberghe

No, no. There might be a default encoder problem for the Linux VM, I don't know, it is not my main platform. If so, it might be better to default to UTF-8. Just check this page: http://zn.stfx.eu/unicode copy any part of the page and inspect Clipboard clipboardText asString I can see the correct unicode character value (not necessarily the right character, but that is a font problem). Copying any Unicode character works, AFAIK. The original problem with the script on https://www.facebook.com/ObjectProfile/posts/742756179144315 is not the a Unicode problem as such. The strange characters seem to be part of https://en.wikipedia.org/wiki/Unicode_control_characters more specifically they are a couple of https://en.wikipedia.org/wiki/Bi-directional_text control characters (like https://en.wikipedia.org/wiki/Left-to-right_mark) I am not sure what they do there. It seems that other programs receiving this clipboard contents somehow filter them out. Maybe all 'control' characters have to be removed. Anybody knows about/understands this stuff ? > On 06 Dec 2014, at 18:44, kilon alios <kilon.alios(a)gmail.com> wrote: > > If its a known issue with a known solution why is not default like this ? > > On Sat, Dec 6, 2014 at 6:48 PM, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > I have experienced similar problems on UBUNTU but in that OS the problem exist when copying from Chrome it does not exist when copying from Firefox. > > Because the default encoding of Pharo VM for Unix is not unicode. If you set it manually (--textenc UTF-8) it should work even with Chrome. > > > Peter >

Dec. 6, 2014

Re: [Pharo-dev] Problem copy pasting from internet browser to GTPlayground

by kilon alios

If its a known issue with a known solution why is not default like this ? On Sat, Dec 6, 2014 at 6:48 PM, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > I have experienced similar problems on UBUNTU but in that OS the > problem exist when copying from Chrome it does not exist when copying from > Firefox. > > Because the default encoding of Pharo VM for Unix is not unicode. If you > set it manually (--textenc UTF-8) it should work even with Chrome. > > > Peter >

Dec. 6, 2014

Re: [Pharo-dev] Problem copy pasting from internet browser to GTPlayground

by Peter UhnÃ¡k

> I have experienced similar problems on UBUNTU but in that OS the problem exist when copying from Chrome it does not exist when copying from Firefox. Because the default encoding of Pharo VM for Unix is not unicode. If you set it manually (--textenc UTF-8) it should work even with Chrome. Peter

Dec. 6, 2014

Re: [Pharo-dev] contributing to Pharo testing effort

by stepharo

Thanks a lot. I would love to get some tests for: Athens-SVG you can now load Athens-SVG from the ConfigurationBrowser TxText Stef > Hi there, > I am interested in helping out with writing tests in Pharo, and was > wondering where would be a good place to start. I am familiar with > Smalltalk from working at GemStone Systems in their QA department some > years ago, but am somewhat new to Pharo. Any advice would be very > appreciated. > > Best regards, > Sheridan Mahoney > >

Dec. 6, 2014

Athens-SVG

by stepharo

Hi I started to define a configuration for Athens-SVG to load XML dependencies. And I started to clean the organization and add some comments. Now I will be able to use it in Bloc :) Stef

Dec. 6, 2014