From gregory_r_warnes@groton.pfizer.com  Mon Nov  4 13:41:03 2002
From: gregory_r_warnes@groton.pfizer.com (Warnes, Gregory R)
Date: Mon, 4 Nov 2002 08:41:03 -0500
Subject: longjmp - was: seemingly random "nesting of readline input" w
 arnings
Message-ID: <D7A3CFD7825BD6119B880002A58F06C20149D189@groexmb02.pfizer.com>

Barry,

Would you mind providing the necessary patch for this behavior?

Thanks,

Greg

> -----Original Message-----
> From: Barry Rowlingson [mailto:B.Rowlingson@lancaster.ac.uk]
> Sent: Monday, November 04, 2002 8:04 AM
> To: r-devel@stat.math.ethz.ch
> Subject: Re: longjmp - was: seemingly random "nesting of 
> readline input"
> warnings
> 
> 
> Luke Tierney wrote:
> 
> > Looks like another case where our expedient but unfortunately too
> > crude approach of handling Control-C on UNIX-likes with longjmp is
> > biting us.  We really do need to bite the bullet and fix 
> this properly.
> > Maybe Duncan and I can coordinate getting a handle on this.
> 
>   please do! It still affects Mosix systems, since the signal 
> handling 
> in longjmp causes a system call on the home machine. Mosix tries to 
> migrate processes to less-loaded machines, but R's constant 
> setjmp'ing 
> means the processes get stuck on the machines where they are 
> started from.
> 
>   When I install a new version of R on our mosix cluster, I 
> also compile 
> a binary with setjmp/longjmp defined as the versions that do not 
> preserve signal state. This produces a binary that migrates 
> better under 
> Mosix but has broken Ctrl-C handling. I then alter the R 
> script so that 
> my modified binary runs if and only if you do "R BATCH". Seems a fair 
> solution at the moment.
> 
>   Barry Rowlingson
>   Maths and Stats
>   Lancaster University
> 
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longjmp - was: seemingly random "nesting of readline input" w arnings
Warnes, Gregory R