From ripley@stats.ox.ac.uk  Thu Aug 23 18:05:43 2001
From: ripley@stats.ox.ac.uk (Prof Brian D Ripley)
Date: Thu, 23 Aug 2001 18:05:43 +0100 (BST)
Subject: Interrupts (was Re: [Rd] X11 protocol errors ...)
In-Reply-To: <Pine.A41.4.33.0108230843490.135314-100000@homer05.u.washington.edu>
Message-ID: <Pine.GSO.4.31.0108231804080.6282-100000@auk.stats>

On Thu, 23 Aug 2001, Thomas Lumley wrote:

> On Thu, 23 Aug 2001, Luke Tierney wrote:
>
> > On Thu, Aug 23, 2001 at 08:16:09AM -0400, Duncan Murdoch wrote:
> > > On Wed, 22 Aug 2001 19:32:51 -0500, you wrote:
> > > >I'm surprised we don't get more of these sorts of things on UNIX.  Our
> > > >current UNIX interrupt handling approach takes an immediate LONGJMP
> > > >out of the signal handler no matter where the signal occurs (except
> > > >for two places where signals are suspended).  Any place where an
> > > >invariant is temporarily broken, any place where an assignment is not
> > > >yet complete, is a potential trouble spot.
>
> This is what is happening in the segfault caused by interrupting
> Sys.sleep under Linux.  Presumably the fix is to wait and take the
> interrupt after restoring the InputHandler.  It would be nice if someone
> who understood this sort of thing could fix it before 1.3.1

Well, I don't know if I will have time, but I do think I know how to do it.
I suspect I always knew this could happen, but forgot to secure against it,
and it hadn't (hasn't) come up in earnest yet .

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Interrupts (was Re: [Rd] X11 protocol errors ...)
Prof Brian D Ripley