April 2019 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Difficulties setting up default image in XMonad

by Paul DeBruicker

OK great. I'm not super familiar with how the launcher works but you may be able to specify & use an older VM with Pharo 8, if you need Pharo 8. Vanessa McHale wrote > I have libcairo, yes. > > I am using Lubuntu and it is based off Ubuntu 18.10 > > Pharo 7 works! So I believe it must be a bug in the new VM > > Thanks! > Vanessa McHale > > On 4/4/19 10:20 AM, Paul DeBruicker wrote: >> Hi Vanessa, >> >> does your OS have libcario installed? >> >> which Os are you using? >> >> Does pharo 7 work? Pharo 8 is alpha. >> >> Does it Pharo 7 or 8 run properly under another window manager on your >> system? >> >> Pharo used to run on xMonad and ratpoison so I'd guess you'll be able to >> get >> it working somehow now. >> >> In the lower right portion of your screenshot there is an error message >> that >> the VM couldn't properly configure itself on your OS. Did you try the >> suggestion in the error message and still have the problem you're >> experiencing? >> >> >> Hope this helps >> >> >> Paul >> >> >> >> Vanessa McHale wrote >>> Hi all, >>> >>> When I try to launch the latest Pharo image in XMonad, I run into the >>> following: >>> >>> Pharo launch failure screenshot >>> >>> I couldn't copy the error text unfortunately so I have attached a >>> screenshot instead. Any hints on what might be causing it? Is it due to >>> my using a tiling window manager? >>> >>> Cheers, >>> Vanessa McHale >>> >>> >>> 2019-04-03-205749_1920x1080_scrot.png (576K) >>> <http://forum.world.st/attachment/5097893/0/2019-04-03-205749_1920x1080_scrot.png> >>> 2019-04-03-205749_1920x1080_scrot.png (576K) >>> <http://forum.world.st/attachment/5097893/1/2019-04-03-205749_1920x1080_scrot.png> >>> signature.asc (499 bytes) >>> <http://forum.world.st/attachment/5097893/2/signature.asc> >> >> >> >> >> -- >> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >> > > > > signature.asc (499 bytes) > <http://forum.world.st/attachment/5097913/0/signature.asc> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

April 4, 2019

Re: [Pharo-users] [Vm-dev] FFIExternalStructureReferenceHandle and pushing it to the stack

by Holger Freyther

> On 4. Apr 2019, at 17:20, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > > Hi Holger, Hey! > The reproducer is: > > StructA new theNest anyCall. > > This is not answering the question I need answering :-). Can you answer the Qs I asked on vm-dev yesterday about the signature of the callback etc? Can you reply there? AdvThnaksance sorry about that. I thought this is an even easier reproducer. Let me respond in the other thread.

April 4, 2019

Re: [Pharo-users] [Vm-dev] FFIExternalStructureReferenceHandle and pushing it to the stack

by Eliot Miranda

Hi Holger, On Thu, Apr 4, 2019 at 12:36 AM Holger Freyther <holger(a)freyther.de> wrote: > In addition to my mail from yesterday to vm-dev I want to share the > following example to illustrate the problem. I have taken StructA and > StructNested from the FFIExternalStructureReferenceHandle class comment and > put it into Unclassified.st that is attached to this mail. I am also making > a call to LibC's getpid and try to push StructNested to the stack. The > ffiCall is failing before getpid is called (Bad argument to external > function). > > The reproducer is: > > StructA new theNest anyCall. > This is not answering the question I need answering :-). Can you answer the Qs I asked on vm-dev yesterday about the signature of the callback etc? Can you reply there? AdvThnaksance > > > StructA has a ByteArray handle of the full struct. theNest returns an > instance of StructNested with a FFIExternalStructureReferenceHandle. This > makes sense as well. It can't be a copy of the ByteArray (or else updates > would be invisible to the outer struct) and it can't be an ExternalAddress > as StructA's handle might move in the Smalltalk heap. > > I am not entirely sure how this is should work but what do you think of: > > 1st) Extending ExternalStructure class comment to list > FFIExternalStructureReferenceHandle as possible handle type? I think we > would only describe the reality. > > > 2nd) ThreadedFFIPlugin>>#ffiPushStructureContentsOf: should be aware of > FFIExternalStructureReferenceHandle and know how to reach the handle. Or > should there be something in the image converting this to a ByteArray when > being pushed as value in a ffiCall? > > > comments/ideas? > > > -- _,,,^..^,,,_ best, Eliot

April 4, 2019

Re: [Pharo-users] [Vm-dev] FFIExternalStructureReferenceHandle and pushing it to the stack

by Eliot Miranda

Hi Holger, On Thu, Apr 4, 2019 at 4:49 AM Holger Freyther <holger(a)freyther.de> wrote: > > > On 4. Apr 2019, at 08:36, Holger Freyther <holger(a)freyther.de> wrote: > > > And I have a stand-a-lone testcase for Pharo as well: > > > https://github.com/zecke/pharo/commit/390f81241a7dfee546784453fa426bc1c218b… > > > Any hint of how I can test (simulate?) and generate changes to > ThreadedX64SysVFFIPlugin from Pharo (or how you normally do it in Squeak). > If I wanted to simulate I would: - create a 64-bit VMMaker image using the scripts in the image directory (32bit works, but 64-bits is faster) - prepare the Pharo image (32 or 64-bit) containing the FFI call so that either it is snapshotted so that it will perform the call immediately, or that a script can be used at start-up to initiate the call - load this image in the simulator, e.g. | cos | cos := StackInterpreterSimulator newWithOptions: #(ObjectMemory Spur32BitMemoryManager PharoVM true). cos systemAttributes at: 2 put: 'segload.st'. cos setBreakSelector: #primitiveCallout. cos openAsMorph; run - then, when I had fixed ThreadedFFIPlugin to function as I wanted I would either submit VMMaker.oscog to http://source.squeak.org/VMMakerInbox or commit directly to http://source.squeak.org/VMMaker Now, the only problem here is that simulation can only proceed up until the point of actually trying to make the call. Currently the simulator isn't clever enough to actually simulate the call. But at least you'll be able to examine the state of the C stack, and the point of calling the foreign function in the simulator. Holder, since much of this is probably very unfamiliar to you I would happily try and pair with you while you attempted it. You can make your Squeak VMMaker image first of course. > cheers > holger > > > > In addition to my mail from yesterday to vm-dev I want to share the > following example to illustrate the problem. I have taken StructA and > StructNested from the FFIExternalStructureReferenceHandle class comment and > put it into Unclassified.st that is attached to this mail. I am also making > a call to LibC's getpid and try to push StructNested to the stack. The > ffiCall is failing before getpid is called (Bad argument to external > function). > > > > The reproducer is: > > > > StructA new theNest anyCall. > > > > > > StructA has a ByteArray handle of the full struct. theNest returns an > instance of StructNested with a FFIExternalStructureReferenceHandle. This > makes sense as well. It can't be a copy of the ByteArray (or else updates > would be invisible to the outer struct) and it can't be an ExternalAddress > as StructA's handle might move in the Smalltalk heap. > > > > I am not entirely sure how this is should work but what do you think of: > > > > 1st) Extending ExternalStructure class comment to list > FFIExternalStructureReferenceHandle as possible handle type? I think we > would only describe the reality. > > > > > > 2nd) ThreadedFFIPlugin>>#ffiPushStructureContentsOf: should be aware of > FFIExternalStructureReferenceHandle and know how to reach the handle. Or > should there be something in the image converting this to a ByteArray when > being pushed as value in a ffiCall? > > > > > > comments/ideas? > > > > > > <Unclassified.st> > > -- _,,,^..^,,,_ best, Eliot

April 4, 2019

Re: [Pharo-users] Difficulties setting up default image in XMonad

by Vanessa McHale

I have libcairo, yes. I am using Lubuntu and it is based off Ubuntu 18.10 Pharo 7 works! So I believe it must be a bug in the new VM Thanks! Vanessa McHale On 4/4/19 10:20 AM, Paul DeBruicker wrote: > Hi Vanessa, > > does your OS have libcario installed? > > which Os are you using? > > Does pharo 7 work? Pharo 8 is alpha. > > Does it Pharo 7 or 8 run properly under another window manager on your > system? > > Pharo used to run on xMonad and ratpoison so I'd guess you'll be able to get > it working somehow now. > > In the lower right portion of your screenshot there is an error message that > the VM couldn't properly configure itself on your OS. Did you try the > suggestion in the error message and still have the problem you're > experiencing? > > > Hope this helps > > > Paul > > > > Vanessa McHale wrote >> Hi all, >> >> When I try to launch the latest Pharo image in XMonad, I run into the >> following: >> >> Pharo launch failure screenshot >> >> I couldn't copy the error text unfortunately so I have attached a >> screenshot instead. Any hints on what might be causing it? Is it due to >> my using a tiling window manager? >> >> Cheers, >> Vanessa McHale >> >> >> 2019-04-03-205749_1920x1080_scrot.png (576K) >> <http://forum.world.st/attachment/5097893/0/2019-04-03-205749_1920x1080_scrot.png> >> 2019-04-03-205749_1920x1080_scrot.png (576K) >> <http://forum.world.st/attachment/5097893/1/2019-04-03-205749_1920x1080_scrot.png> >> signature.asc (499 bytes) >> <http://forum.world.st/attachment/5097893/2/signature.asc> > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

April 4, 2019

Re: [Pharo-users] Difficulties setting up default image in XMonad

by Paul DeBruicker

Hi Vanessa, does your OS have libcario installed? which Os are you using? Does pharo 7 work? Pharo 8 is alpha. Does it Pharo 7 or 8 run properly under another window manager on your system? Pharo used to run on xMonad and ratpoison so I'd guess you'll be able to get it working somehow now. In the lower right portion of your screenshot there is an error message that the VM couldn't properly configure itself on your OS. Did you try the suggestion in the error message and still have the problem you're experiencing? Hope this helps Paul Vanessa McHale wrote > Hi all, > > When I try to launch the latest Pharo image in XMonad, I run into the > following: > > Pharo launch failure screenshot > > I couldn't copy the error text unfortunately so I have attached a > screenshot instead. Any hints on what might be causing it? Is it due to > my using a tiling window manager? > > Cheers, > Vanessa McHale > > > 2019-04-03-205749_1920x1080_scrot.png (576K) > <http://forum.world.st/attachment/5097893/0/2019-04-03-205749_1920x1080_scrot.png> > 2019-04-03-205749_1920x1080_scrot.png (576K) > <http://forum.world.st/attachment/5097893/1/2019-04-03-205749_1920x1080_scrot.png> > signature.asc (499 bytes) > <http://forum.world.st/attachment/5097893/2/signature.asc> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

April 4, 2019

Re: [Pharo-users] What's wrong with latest Pharo?

by Vitor Medina Cruz

No, you can't install libcurl3 with libcurl4. There is a known conflict between them: https://bugs.launchpad.net/ubuntu/+source/curl/+bug/1754294, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900511 Ubuntu 18.4 don't come with curl, but I think it comes with libcurl3 (I don't have means to verify it now), but when you install curl, it installs libcurl4 and removes libcurl3. On Thu, Apr 4, 2019 at 11:00 AM Richard O'Keefe <raoknz(a)gmail.com> wrote: > apt-cache search > reports everything it knows about, not just things that are INSTALLED. > For example, apt-cache search reports lua-curl-dev, but it is not > installed. > apt list | grep lua-curl-dev > > The fact that neither libcurl3 nor libcurl4 is initially installed > means that either of them can be installed without conflict. > > On Thu, 4 Apr 2019 at 01:34, Ben Coman <btc(a)openinworld.com> wrote: > >> >> On Wed, 3 Apr 2019 at 05:09, Richard O'Keefe <raoknz(a)gmail.com> wrote: >> >>> I just did a complete reinstall of Ubuntu 18.4 on this >>> laptop yesterday, >>> >> >> >> >>> and it did not come with any version of curl. >>> >> >> What do you mean? Under WSL I have installed Ubuntu 18.4 and for... >> $ apt-cache search libcurl | less >> I see libcurl3 and libcurl4 >> >> cheers -ben >> >> >>> uname -a => >>> Linux Inspiron 4.18.0-16-generic #17~18.04.1-Ubuntu SMP Tue Feb 12 >>> 13:35:51 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux >>> >>> >>> >>> On Wed, 3 Apr 2019 at 01:27, Vitor Medina Cruz <vitormcruz(a)gmail.com> >>> wrote: >>> >>>> Installing curl don't work because there is a conflict between curl >>>> version name used on Ubuntu and that used by Pharo, you can't install >>>> libcurl 3 and libcru4 together. Ubuntu 18 comes with libcurl4 and older >>>> software depending on libcurl3 broke with it. I tested with minidebian and >>>> it also failed. >>>> >>>> Richard, was you able to use Iceberg? It should only work if either >>>> Ubuntu fix this dependency problem with libcurl or Pharo started to use >>>> libcrl4. >>>> >>>> >>>> >>>> On Tue, Apr 2, 2019 at 5:50 AM Richard O'Keefe <raoknz(a)gmail.com> >>>> wrote: >>>> >>>>> I have Pharo 6.1 and Pharo 7.0 working in Ubuntu 18.04 >>>>> with no trouble so far. I just downloaded the launcher >>>>> from pharo.org and pulled the images down that way. >>>>> >>>>> One thing I do find annoying in Ubuntu 18.04 is the >>>>> number of programs (like okular) that spew warning >>>>> messages out the terminal. Pharo, sadly, is one of >>>>> them. Whenever a debugger window comes up in Pharo >>>>> there is spewage on the terminal. But it works. >>>>> >>>>> >>>>> On Tue, 2 Apr 2019 at 13:07, john pfersich <jpfersich(a)gmail.com> >>>>> wrote: >>>>> >>>>>> Ubuntu 18.04 LTS is, IMHO, is royal piece of crap. Ubuntu seems to >>>>>> have abandoned programmers tools almost completely in 18.04. Iâve had more >>>>>> problems with support of programming tools in 18.04, more than even >>>>>> Windows. I have run âsudo apt installâ maybe 80 times to install tools and >>>>>> libraries. Ubuntu 18.04âs hardware support is also lame compared to 16.04. >>>>>> Personally , Iâm not surprised that Pharo doesnât run on 18.04. I >>>>>> stopped installing 18.04 on my new machines, after all 16.04 still has a >>>>>> few years of support going for it, and at least it works without hours of >>>>>> upgrading. >>>>>> >>>>>> /*âââââââââââââââââ-*/ >>>>>> Sent from my iPhone >>>>>> https://boincstats.com/signature/-1/user/51616339056/sig.png >>>>>> See https://objectnets.net and https://objectnets.org >>>>>> >>>>>> > On Apr 1, 2019, at 06:06, horrido <horrido.hobbies(a)gmail.com> >>>>>> wrote: >>>>>> > >>>>>> > This issue bit me in the ass before, but I forgot. Yes, I had a >>>>>> senior >>>>>> > moment. >>>>>> > >>>>>> > The issue is this: When I tried to run Pharo under Ubuntu Server >>>>>> 18.04 at >>>>>> > OVH last year, it failed. I had to fall back to Ubuntu Server 16.04. >>>>>> > >>>>>> > This week, I tried to run Pharo under Ubuntu Server 18.04 at Google >>>>>> Cloud >>>>>> > Platform and it failed. Again, I had to fall back to Ubuntu Server >>>>>> 16.04. >>>>>> > >>>>>> > Why does this issue keep biting me in the ass??? Because I'm 65 and >>>>>> my brain >>>>>> > is dying. >>>>>> > >>>>>> > The bigger issue is this: Hosting services like Digital Ocean, OVH, >>>>>> and >>>>>> > Google Cloud Platform are becoming increasingly important in the >>>>>> enterprise >>>>>> > space. If Pharo can't run on these server operating systems, it's >>>>>> going to >>>>>> > be a black eye for the language. We can get away with not >>>>>> supporting this >>>>>> > for now, but it will eventually catch up with us. >>>>>> > >>>>>> > At Google Cloud Platform, for example, the user can choose from >>>>>> this list of >>>>>> > hosts: Debian GNU/Linux 9 (Stretch), CentOS 6, CentOS 7, various >>>>>> versions of >>>>>> > CoreOS, Ubuntu 14.04 LTS Minimal, Ubuntu 16.04 LTS Minimal, Ubuntu >>>>>> 18.04 LTS >>>>>> > Minimal, Ubuntu 18.10 Minimal, various versions of Red Hat, various >>>>>> versions >>>>>> > of SUSE, various versions of Window, and so on. It's a long list. *I >>>>>> > strongly suspect that many of these are unusable with Pharo.* >>>>>> > >>>>>> > How to address this? I don't know. But if it's not a major problem >>>>>> now, it >>>>>> > will be. It's bitten me in the ass twice, and I can't be alone. >>>>>> > >>>>>> > I'm giving a fair warning to everyone. Don't lash back at me â I'm >>>>>> just the >>>>>> > canary in the coal mine. >>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>>> > Tim Mackinnon wrote >>>>>> >> Come on, letâs try not to be dismissive , weâve all had that >>>>>> annoying >>>>>> >> moment where something doesnât work. >>>>>> >> >>>>>> >> Richard, was this installed with zero conf or Launcher, and as >>>>>> mentioned - >>>>>> >> a Linux distro is going to be helpful. >>>>>> >> >>>>>> >> Iâm assuming it worked before at some point for you right? But was >>>>>> that v6 >>>>>> >> and now youâre trying v7? >>>>>> >> >>>>>> >> Tim >>>>>> >> >>>>>> >> >>>>>> >> Sent from my iPhone >>>>>> >> >>>>>> >>> On 31 Mar 2019, at 23:46, john pfersich < >>>>>> > >>>>>> >> jpfersich@ >>>>>> > >>>>>> >> > wrote: >>>>>> >>> >>>>>> >>> What Linux (distro and version) and which version of Pharo. You >>>>>> couldnât >>>>>> >>> supply less information if you tried. >>>>>> >>> >>>>>> >>> >>>>>> >>> /*âââââââââââââââââ-*/ >>>>>> >>> Sent from my iPhone >>>>>> >>> https://boincstats.com/signature/-1/user/51616339056/sig.png >>>>>> >>> See https://objectnets.net and https://objectnets.org >>>>>> >>> >>>>>> >>>> On Mar 31, 2019, at 14:21, Richard Kenneth Eng < >>>>>> > >>>>>> >> horrido.hobbies@ >>>>>> > >>>>>> >> > wrote: >>>>>> >>>> >>>>>> >>>> I just installed Pharo under Linux and when I start it up, I get: >>>>>> >>>> >>>>>> >>>> Error: External module not found >>>>>> >>>> >>>>>> >>>> It doesn't matter how I install Pharo. >>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>>> > -- >>>>>> > Sent from: >>>>>> http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >>>>>> > >>>>>> >>>>>>

April 4, 2019

Re: [Pharo-users] What's wrong with latest Pharo?

by Richard O'Keefe

apt-cache search reports everything it knows about, not just things that are INSTALLED. For example, apt-cache search reports lua-curl-dev, but it is not installed. apt list | grep lua-curl-dev The fact that neither libcurl3 nor libcurl4 is initially installed means that either of them can be installed without conflict. On Thu, 4 Apr 2019 at 01:34, Ben Coman <btc(a)openinworld.com> wrote: > > On Wed, 3 Apr 2019 at 05:09, Richard O'Keefe <raoknz(a)gmail.com> wrote: > >> I just did a complete reinstall of Ubuntu 18.4 on this >> laptop yesterday, >> > > > >> and it did not come with any version of curl. >> > > What do you mean? Under WSL I have installed Ubuntu 18.4 and for... > $ apt-cache search libcurl | less > I see libcurl3 and libcurl4 > > cheers -ben > > >> uname -a => >> Linux Inspiron 4.18.0-16-generic #17~18.04.1-Ubuntu SMP Tue Feb 12 >> 13:35:51 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux >> >> >> >> On Wed, 3 Apr 2019 at 01:27, Vitor Medina Cruz <vitormcruz(a)gmail.com> >> wrote: >> >>> Installing curl don't work because there is a conflict between curl >>> version name used on Ubuntu and that used by Pharo, you can't install >>> libcurl 3 and libcru4 together. Ubuntu 18 comes with libcurl4 and older >>> software depending on libcurl3 broke with it. I tested with minidebian and >>> it also failed. >>> >>> Richard, was you able to use Iceberg? It should only work if either >>> Ubuntu fix this dependency problem with libcurl or Pharo started to use >>> libcrl4. >>> >>> >>> >>> On Tue, Apr 2, 2019 at 5:50 AM Richard O'Keefe <raoknz(a)gmail.com> wrote: >>> >>>> I have Pharo 6.1 and Pharo 7.0 working in Ubuntu 18.04 >>>> with no trouble so far. I just downloaded the launcher >>>> from pharo.org and pulled the images down that way. >>>> >>>> One thing I do find annoying in Ubuntu 18.04 is the >>>> number of programs (like okular) that spew warning >>>> messages out the terminal. Pharo, sadly, is one of >>>> them. Whenever a debugger window comes up in Pharo >>>> there is spewage on the terminal. But it works. >>>> >>>> >>>> On Tue, 2 Apr 2019 at 13:07, john pfersich <jpfersich(a)gmail.com> wrote: >>>> >>>>> Ubuntu 18.04 LTS is, IMHO, is royal piece of crap. Ubuntu seems to >>>>> have abandoned programmers tools almost completely in 18.04. Iâve had more >>>>> problems with support of programming tools in 18.04, more than even >>>>> Windows. I have run âsudo apt installâ maybe 80 times to install tools and >>>>> libraries. Ubuntu 18.04âs hardware support is also lame compared to 16.04. >>>>> Personally , Iâm not surprised that Pharo doesnât run on 18.04. I >>>>> stopped installing 18.04 on my new machines, after all 16.04 still has a >>>>> few years of support going for it, and at least it works without hours of >>>>> upgrading. >>>>> >>>>> /*âââââââââââââââââ-*/ >>>>> Sent from my iPhone >>>>> https://boincstats.com/signature/-1/user/51616339056/sig.png >>>>> See https://objectnets.net and https://objectnets.org >>>>> >>>>> > On Apr 1, 2019, at 06:06, horrido <horrido.hobbies(a)gmail.com> wrote: >>>>> > >>>>> > This issue bit me in the ass before, but I forgot. Yes, I had a >>>>> senior >>>>> > moment. >>>>> > >>>>> > The issue is this: When I tried to run Pharo under Ubuntu Server >>>>> 18.04 at >>>>> > OVH last year, it failed. I had to fall back to Ubuntu Server 16.04. >>>>> > >>>>> > This week, I tried to run Pharo under Ubuntu Server 18.04 at Google >>>>> Cloud >>>>> > Platform and it failed. Again, I had to fall back to Ubuntu Server >>>>> 16.04. >>>>> > >>>>> > Why does this issue keep biting me in the ass??? Because I'm 65 and >>>>> my brain >>>>> > is dying. >>>>> > >>>>> > The bigger issue is this: Hosting services like Digital Ocean, OVH, >>>>> and >>>>> > Google Cloud Platform are becoming increasingly important in the >>>>> enterprise >>>>> > space. If Pharo can't run on these server operating systems, it's >>>>> going to >>>>> > be a black eye for the language. We can get away with not supporting >>>>> this >>>>> > for now, but it will eventually catch up with us. >>>>> > >>>>> > At Google Cloud Platform, for example, the user can choose from this >>>>> list of >>>>> > hosts: Debian GNU/Linux 9 (Stretch), CentOS 6, CentOS 7, various >>>>> versions of >>>>> > CoreOS, Ubuntu 14.04 LTS Minimal, Ubuntu 16.04 LTS Minimal, Ubuntu >>>>> 18.04 LTS >>>>> > Minimal, Ubuntu 18.10 Minimal, various versions of Red Hat, various >>>>> versions >>>>> > of SUSE, various versions of Window, and so on. It's a long list. *I >>>>> > strongly suspect that many of these are unusable with Pharo.* >>>>> > >>>>> > How to address this? I don't know. But if it's not a major problem >>>>> now, it >>>>> > will be. It's bitten me in the ass twice, and I can't be alone. >>>>> > >>>>> > I'm giving a fair warning to everyone. Don't lash back at me â I'm >>>>> just the >>>>> > canary in the coal mine. >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > Tim Mackinnon wrote >>>>> >> Come on, letâs try not to be dismissive , weâve all had that >>>>> annoying >>>>> >> moment where something doesnât work. >>>>> >> >>>>> >> Richard, was this installed with zero conf or Launcher, and as >>>>> mentioned - >>>>> >> a Linux distro is going to be helpful. >>>>> >> >>>>> >> Iâm assuming it worked before at some point for you right? But was >>>>> that v6 >>>>> >> and now youâre trying v7? >>>>> >> >>>>> >> Tim >>>>> >> >>>>> >> >>>>> >> Sent from my iPhone >>>>> >> >>>>> >>> On 31 Mar 2019, at 23:46, john pfersich < >>>>> > >>>>> >> jpfersich@ >>>>> > >>>>> >> > wrote: >>>>> >>> >>>>> >>> What Linux (distro and version) and which version of Pharo. You >>>>> couldnât >>>>> >>> supply less information if you tried. >>>>> >>> >>>>> >>> >>>>> >>> /*âââââââââââââââââ-*/ >>>>> >>> Sent from my iPhone >>>>> >>> https://boincstats.com/signature/-1/user/51616339056/sig.png >>>>> >>> See https://objectnets.net and https://objectnets.org >>>>> >>> >>>>> >>>> On Mar 31, 2019, at 14:21, Richard Kenneth Eng < >>>>> > >>>>> >> horrido.hobbies@ >>>>> > >>>>> >> > wrote: >>>>> >>>> >>>>> >>>> I just installed Pharo under Linux and when I start it up, I get: >>>>> >>>> >>>>> >>>> Error: External module not found >>>>> >>>> >>>>> >>>> It doesn't matter how I install Pharo. >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > -- >>>>> > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >>>>> > >>>>> >>>>>

April 4, 2019

Re: [Pharo-users] Slots and Metalink

by Vitor Medina Cruz

Steven: Oh! I was unaware of these methods under reflection protocol! I manage to make it work, and it is simply AWESOME!! :) Marcus: I wanted to intercept the store generally, with any kind of slot, kind of an AOP aproach. I did this: | slotLink | slotLink := (MetaLink new metaObject: [Transcript show: 'ihaaaa!!!!']; selector: #value; arguments: #(); control: #before). TestObject link: slotLink toSlotNamed: #b option: #write. And it worked like a charm! By you explanation, this would lead to some performance penality, but it seems a really powerfull mechanism to me, and it's performance should be similar to that of extending a Slot, no? On Thu, Apr 4, 2019 at 5:04 AM Marcus Denker <marcus.denker(a)inria.fr> wrote: > > > > On 3 Apr 2019, at 15:57, Vitor Medina Cruz <vitormcruz(a)gmail.com> wrote: > > > > Hello, > > > > Is it possible to intercept a slot store? I tried with a before metalink > into #write:to selector, but it don't seems to work. Should I use another > selector? > > > > The #write:to: method is the reflective read method that implements read > on the level of the variable. If you subclass class Slot, you can make you > own kind of > Variables by just overriding #write:to and read: > > But of course compiling every read by calling a method would be very slow. > > Therefore, one can override emitStore: and emitValue: to instead emit > faster code by telling the compiler exactly what bytecode to generate for > read and write. > This makes it much faster, but at the expense that the reflective methods > are not called anymore. > > (It would be nicer if we would inline the read: code automatically, but > that has its own set of problems) > > > > I would like to experiment with ivar change notification, but I don't > know what is the better approach. > > > > What you could do is to make your own subclass to experiment. IndexedSlot > is the superclass of the normal instancevariables, but without the > optimised code generation. > So it is the perfect superclass to experiment: > > IndexedSlot subclass: #MyTestSlot > instanceVariableNames: '' > classVariableNames: '' > package: 'Slot-Core-Variablesâ > > > now Implement > > read: anObject > Transcript show: 'reading ', self name. > super read: anObject. > > > Now we can make a class that uses it: > > Object subclass: #MyClass > slots: { #ivar => MyTestSlot } > classVariables: { } > package: 'Slot-Core-Variablesâ > > > and add a simple method reading the variable: > > ivar > ^ivar > > If you now execute "MyClass new ivarâ and you will see the output on the > Transcript. > > > Marcus >

April 4, 2019

Re: [Pharo-users] is this valid smalltalk

by Roelof Wobben

April 4, 2019