From: Arne Hueggenberg <zalaster@nef.wh.uni-dortmund.de>
Newsgroups: comp.lang.beta
Subject: Re: problems with processes
Date: Mon, 01 Mar 1999 11:59:46 +0100
Organization: Universität Dortmund, Germany
Lines: 87
Message-ID: <36DA7322.E03820E2@nef.wh.uni-dortmund.de>
References: <19990228081141.24335.qmail@noatun.mjolner.dk>
NNTP-Posting-Host: napoli4.cs.uni-dortmund.de
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Mailer: Mozilla 4.05 [en] (X11; I; SunOS 5.6 sun4m)
Path: news.cs.au.dk!news.net.uni-c.dk!howland.erols.net!cpk-news-hub1.bbnplanet.com!news.gtei.net!fu-berlin.de!uniol!news.rz.uni-hildesheim.de!Informatik.Uni-Dortmund.DE!news
Xref: news.cs.au.dk comp.lang.beta:11847

Sascha Kimmel wrote:
> 
<SNIP>
> > >>
> > >> Also, when putting it all in one file it seems to work fine, except for
> > >> the fact that
> > >>
> > >> PrintMe[]->RedirectFromChannel;
> > >>
> > >> results in :
> > >>
> > >> # Beta execution aborted: Qualification error in reference assignment.
> > >> # Look at 'lpr.dump'
> > >
> > >It's obvious that if there's no process to which the string should be
> > >redirected to, there is a little problem.
> > >Try <<PrintMe[]->child.RedirectFromChannel;>>
> > some checking is in order here, but remember, the code only serves to
> > demonstrate my problem
> 
> Yes, but WHICH channel gets the PrintMe[]-Text-reference?
> Here it is simply NONE.
> 
> >
> > in the second case, where i change lpr.bet so that everything
> > happens in it
> > there is a process, note that it dumps with an qualification
> > error (e.g. some
> > reference is passed wich is not properly qualified) not
> > ´reference is none´
> > The qualification error is what has me wondering, as text is
> > stronger qualified
> > than stream it should be no problem to pass it to a method
> > expecting a stream.
> 
> Yes, but the method is not bound to/by any process!
> 
> The implementation (processmanager.bet) looks as follows:
> 
> Process:
>   (* Notice, this(Process) can only be executed once.
>    *
>    * Two program executions of the same Process,
>    * can be executed by instantiating and executing two different BETA
>    * objects from the same Process.
>    *)
>   (#
> 
> [...]
>      redirectFromChannel:  (* redirect input to this(process) from
> inputChannel *)
>        (# error:< ProcessManagerException;
>           inputChannel: ^Stream;
>        enter inputChannel[]
>        <<SLOT redirectFromChannel:dopart>>
>        #);
> [...]
>   #);
> 
> So you did not qualify the process to which the input should be redirected
> to.
> So that is a qualification error, I would say.
> 
> > even changing the texts qualification to stream doesent help so
> > im guessing its
> > something else, but i dont understand what.
> 
> Did you try PrintMe[]->child.RedirectFromChannel ?

Thats what my source code says, seems i should hav kept
cutting'n'pasting instead of entering that by hand

> > >> trying to be clever i then did
> > >>
> > >> PrintMe[]->qua(# as::< stream #)->RedirectFromChannel;
> > >>
> > >>
> > >> but to no avail, still dumps with the same qualification error in
> > >> reference assignment
> > >

<SNIP>
 
> Regards,
> Sascha Kimmel

Arne Hueggenberg