From: dennison@telepath.com
Subject: Re: Exception Propagation
Date: 1999/06/09
Date: 1999-06-09T00:00:00+00:00 [thread overview]
Message-ID: <7jluvt$lfr$1@nnrp1.deja.com> (raw)
In-Reply-To: m3wvxef8zw.fsf@mheaney.ni.net
In article <m3wvxef8zw.fsf@mheaney.ni.net>,
Matthew Heaney <matthew_heaney@acm.org> wrote:
> Robert Dewar <robert_dewar@my-deja.com> writes:
>
> > I would have preferred that an unhandled exception in a task
> > caused termination of the entire program, you can always get
> > the bizarre effect in the RM if you really want it by doing:
> >
> > exception when others => null;
> >
> > at the outer level of a task
>
> I don't understand this comment.
>
> Given this task body:
>
> task body T is
> ...
> begin
> ...
> exception
> when others => null;
>
> end T;
>
> Are you saying that if an exception occurs, that that exception
handler
> will cause behavior other than silent termination of task T?
I think you missed the subjunctive clause. He's talking about a
hypothecital scheme where termination of an Ada task via an
unhandled exception causes the entire program to terminate, not actual
Ada. In such a scheme, the *current* behavior of Ada programs (silent
termination) could be achieved by the code above.
The only way I can think of to implement Matt's suggestion would be to
indeed raise the exception in the parent task (in a non-determinstic
location) when a child task is terminated by it, as in my hypothetical
TERD language. :-)
--
T.E.D.
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
next prev parent reply other threads:[~1999-06-09 0:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-06-07 0:00 Exception Propagation Decker, Christian R
1999-06-07 0:00 ` dennison
1999-06-08 0:00 ` Glen
1999-06-08 0:00 ` Decker, Christian R
1999-06-08 0:00 ` David C. Hoos, Sr.
1999-06-08 0:00 ` Robert Dewar
1999-06-09 0:00 ` dennison
1999-06-14 0:00 ` Robert A Duff
1999-06-14 0:00 ` dennison
1999-06-15 0:00 ` Robert A Duff
1999-06-14 0:00 ` Bryce Bardin
1999-06-15 0:00 ` Dale Stanbrough
1999-06-15 0:00 ` Robert A Duff
1999-06-08 0:00 ` Robert Dewar
1999-06-09 0:00 ` Matthew Heaney
1999-06-08 0:00 ` R. Tim Coslet
1999-06-09 0:00 ` Robert Dewar
1999-06-09 0:00 ` dennison [this message]
1999-06-08 0:00 ` dennison
-- strict thread matches above, loose matches on Subject: below --
2006-03-15 15:16 Exception propagation REH
2006-03-16 21:29 ` Ludovic Brenta
2006-03-16 22:19 ` REH
2006-03-16 22:51 ` Ludovic Brenta
2006-03-17 2:52 ` REH
2006-03-17 14:52 ` Georg Bauhaus
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox