[Rd] Catch SIGINT from user in backend C++ code

R. Michael Weylandt michael.weylandt at gmail.com
Thu May 2 12:04:38 CEST 2013

On Thu, May 2, 2013 at 12:50 AM, Jewell, Chris <C.P.Jewell at massey.ac.nz> wrote:
> Hi,
> I was wondering if anybody knew how to trap SIGINTs (ie Ctrl-C) in backend C++ code for R extensions?  I'm writing a package that uses the GPU for some hefty matrix operations in a tightly coupled parallel algorithm implemented in CUDA.
> The problem is that once running, the C++ module cannot apparently be interrupted by a SIGINT, leaving the user sat waiting even if they realise they've launched the algorithm with incorrect settings.  Occasionally, the SIGINT gets through and the C++ module stops.  However, this leaves the CUDA context hanging, meaning that if the algorithm is launched again R dies.  If I could trap the SIGINT, then I could make sure a) that the algorithm stops immediately, and b) that the CUDA context is destructed nicely.
> Is there a "R-standard" method of doing this?

I think R_CheckUserInterrupt() might be the right way to go but I
haven't used it much, so not sure if it gives you recovery ability.


> Thanks,
> Chris
> --
> Dr Chris Jewell
> Lecturer in Biostatistics
> Institute of Fundamental Sciences
> Massey University
> Private Bag 11222
> Palmerston North 4442
> New Zealand
> Tel: +64 (0) 6 350 5701 Extn: 3586
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