[Vm-dev] Problems involving cogvm and Unix OSProcessPlugin OSProcess PipeableOSProcess

[Eliot Miranda]

Hi David,

    what's the reason for shutting down interval timers around fork?  What
was the issue that necessitated this in the first place?  We're likely
getting bit by this and I want to try and keep the solution as simple as
possible.

best
Eliot

On Sat, Sep 4, 2010 at 7:20 AM, David T. Lewis <lewis at mail.msen.com> wrote:

>
> I think that you have confirmed that #forkSqueak does not work on a Cog VM.
> The likely reason for this is that #forkSqueak involves temporarily
> disabling
> timer signals from the operating system, then reenabling them in both the
> child and parent after the fork(). The Cog VM is using a different
> underlying
> timer mechanism (pthreads etc) so the current #forkSqueak mechanism would
> probably need to be redone for Cog. I have not looked in to this at all,
> but I did expect that this might be a problem and I think you have
> confirmed
> it in the log below.
>
> Dave
>
> On Fri, Sep 03, 2010 at 09:52:29AM -0300, Casimiro de Almeida Barreto
> wrote:
> >
> >  Here's the log:
> >
> > Untrustedir /home/casimiro/Desenvolvimento/cog.work/secure
> > UnixOSPrReceiversessionIdentvaria DependentsArray(a UnixProcess with pid
> > 3490)
> > fier:     #[202 58grimReaper: siona Process in [] in [] in
> > UnixOSProcessAccessor>>
> > grimReaperProcessigChldSemaphore:     a Semaphore(a Process in [] in []
> > in Uni
> > UnixOSPrReceiversessionIdentifier: epend#[202 58 13 UnixProcess with pid
> > 3490)
> > 6]          grimReaper: sio a Process in [] in [] in
> UnixOSProcessAccessor>>
> > grimReaperProcessigChldSemaphore:     a Semaphore(a Process in [] in []
> > in Uni
> > UnixOSPrReceivercanObtainSessionIdenpend#[202 58 13 86]xProcess with pid
> > 3490)
> > ifierFromPlugin:grimReaper:     a Process in [] in [] in
> > UnixOSProcessAccessor>>
> > grimReaperProcessigChldSemaphore:     a Semaphore(a Process in [] in []
> > in Uni
> > UnixOSPrReceiversessionIdentifier: epend#[2sArray(a UnixProcess with pid
> > 3490)
> > 2 58 13 86]     grimReaper: siona Process in [] in [] in
> > UnixOSProcessAccessor>>
> > grimReaperProcessigChldSemaphore:     a Semaphore(a Process in [] in []
> > in Uni
> > UnixProcess>>redirect:to:- - - - - - - - - - - - - - - - - - - - -
> > [] in PipeableOSProcess
> > class>>forkSqueakAndDoThenQuit:errorPipelineStream:headl
> >
> Compiler>>evaluate:in:to:notifyiningTo:toPrecision:maxEpochs:reportingEach:ss:
> > PluggableTextMorphPlus(PluggableTextMorph)>>handleEdit:
> > MorphicEventh(Morph)>>handleEvent:nt:ndTo:
> > [] in HandMhandleFocusEvent:nt:using::with:h:
> > ...etc...>>handleEvent:nt::clear:r:ing:
> >
> >
> > BTW, XDisplayControlPlugin explodes cogvm at my face... but seems to be
> > required by TranscriptStream (trying to figure out what's  going on
> > there... then I'll report the problem properly).
> >
>
>
>
>
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