Re: Processes

[Gary Highberger]

Excellent work David! A thousand Thanks.
Gary

On Tue, Jan 26, 2021, 12:06 PM stes@PANDORA.BE <stes@telenet.be> wrote:

>
> All,
>
> The first program
>
> $ cat tst.st
> " Ref: Blue Book pg. 266
>   This program works. Type gst tst.st at the Linux
>   prompt and find out for yourself.
> "
> [[true] whileTrue: [
>         (Time now) printNl .
>         (Delay forSeconds: 1) wait
>         ]
> ] value
>
> continues forever for me (until I control-C stop gst) and prints the
> current time every second.
>
> The second program
>
> $ cat tstX.st
> " Ref: Blue Book pg. 266
>   This program doesn't work. Type gst tstX.st at the Linux
>   prompt and find out for yourself.
> "
> [[true] whileTrue: [
>         (Time now) printNl .
>         (Delay forSeconds: 1) wait
>         ]
> ]fork
>
> Just prints one line (the current time) (1 line) and then exits for me.
>
> However it is perhaps not a bad idea to try to add a Delay forSeconds:10
> wait after the fork in the main process.
>
> If the main process waits another 10 seconds, then it prints 10 lines for
> me, I just added a line after the fork:
>
> fork.
> (Delay forSeconds:10) wait
>
> Also I suppose it is possible to wait for the forked process itself so
> that it continues indefinitely.
>
> The problem is that the main process has exited and so the forked process
> is also gone.
>
> However if the main GST process keeps around, then the above second
> program also works.
>
> Regards,
> David Stes
>
>
> ----- Op 26 jan 2021 om 13:20 schreef Mark Bratcher mdbratch@gmail.com:
>
> > Hi Holger
> >
> > I tried Gary’s test samples on 3.2.91 and it exhibits the same behavior
> as
> > 3.2.5.
> >
> > Mark
> >
> > Sent from [ https://go.microsoft.com/fwlink/?LinkId=550986 | Mail ] for
> Windows
> > 10
> >
> > From: [ mailto:holger@freyther.de | Holger Freyther ]
> > Sent: Tuesday, January 26, 2021 2:12 AM
> > To: [ mailto:gary.highberger@gmail.com | Gary Highberger ]
> > Cc: [ mailto:help-smalltalk@gnu.org | help-smalltalk ]
> > Subject: Re: Processes
> >
> > Hi Gary!
> >
> > How did you get GNU Smalltalk 3.2.5? On the surface this sounds like a
> problem
> > already fixed[1] in the development branch of GNU Smalltalk? Could you
> try to
> > cherry-pick this[1] and see if the problem persists?
> >
> > thank you
> >
> > holger
> >
> > [1]
> >
> http://git.savannah.gnu.org/cgit/smalltalk.git/commit/?id=72ada189aba0283c551ead16635c1983968080b8
> >
> >> On 26. Jan 2021, at 10:53, Gary Highberger <gary.highberger@gmail.com>
> wrote:
> >
> >>
> >
> >> Hi Help-Smalltalk,
> >
> >>
> >
> >> If processes aren't supported in 3.2.5 then read no further :-)
> >
> >>
> >
> >> Forks or Delays might be broken in 3.2.5. I totally hope I'm wrong or
> that
> >
> >> there's a clean workaround.
> >
> >>
> >
> >> For what I can tell, Forked* infinite loop processes containing a Delay
> >
> >> won't run.*
> >
> >>
> >
> >> Links to two Smalltalk programs based on an infinite loop, Delay, fork,
> >
> >> example from the Bluebook follow:
> >
> >>
> >
> >> https://www.dropbox.com/s/rs4iobnhh6vzmc4/tst.st?dl=0
> >
> >>
> >
> >> https://www.dropbox.com/s/0zybbef44e45w3c/tstX.st?dl=0
> >
> >>
> >
> >> At the Linux prompt enter gst tst.st to observe desired behavior.
> >
> >>
> >
> >> At the Linux prompt enter gst tstX.st to see the failed fork behavior.
> >
> >>
> >
> >> Any help you can provide will be greatly appreciated!
> >
> >>
> >
> >> Thank you,
> >
> >>
> >
> > > Gary Highberger
>