R devel - Nov 2002 - longjmp - was: seemingly random "nesting of readline input" w arnings

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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Warnes, Gregory R wrote:
> Would you mind providing the necessary patch for this behavior?
  Here's the patch, in 'how-to-do-it' format:

1. Get, compile, check, install R as usual.

2. Edit $RSRC/src/include/Defn.h to make sure that the following are 
defined:

# define JMP_BUF jmp_buf
# define SETJMP(x) setjmp(x)
# define LONGJMP(x,i) longjmp(x,i)

  and make sure that the 'sig-' versions are undefined. There's
probably
a way of doing it via configure, but its easy enough to tweak this way.

3. Compile, check. Copy generated binary to $RHOME/bin/R-jmp.bin

4. Edit one line in $RHOME/bin/BATCH so it calls R-jmp.bin instead of 
R.bin.

  Voila, one Mosix-enhanced binary that will only react to the first 
Ctrl-C you throw at it, ignoring subsequent ones. However this isnt 
generally a problem when running with R BATCH since its a batch job and 
there's nobody around to throw Ctrl-Cs at it. However, other signal 
handling may be broken, so dont try to control your R BATCH job by 
sending signals to it.

  Only use this if you know what you are doing, and dont expect any help 
from me or any of the R developers if this breaks stuff - check any 
putative bugs with a standard-compiled version first.

Barry Rowlingson
Maths and Stats
Lancaster University, UK


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