Re: [f2py] cancel fortran module inside python shell

Hi,

It would be nice to add this signal handler hook to the f2py repo. The hook
ought to be implemented similar to the `threadsafe` feature, say, using a
statement `catchctrlc` or similar (or more general: `signal_convert(SIGINT,
RuntimeError)`).

Best regards,
Pearu

On Thu, Jan 6, 2011 at 1:21 PM, James Kermode <[email protected]>wrote:

> If you're not too worried about memory leaks, it's possible to slightly
> modify f2py to allow interrupts with Ctrl+C to be caught and turned into
> Python exceptions. I've done this by changing the code generated by f2py to
> call the fortran routine so that it installs a custom signal handler for the
> SIGINT signal. A setjmp()/longjmp() trap is used to raise an exception if an
> interrupt occurs inside the fortran routine. This technique also allows
> Fortran routines to raise exceptions if an error occurs. You can see the
> code I use to do this at the links below.
>
> James.
>
>
> http://src.tcm.phy.cam.ac.uk/viewvc/jrk33/repo/trunk/QUIP/Tools/quippy/patch_f2py.py?revision=7798&view=co
>
> http://src.tcm.phy.cam.ac.uk/viewvc/jrk33/repo/trunk/QUIP/libAtoms/cutil.c?view=co
>
> On 5 Jan 2011, at 20:02, Kevin Mitchell wrote:
>
> > As far as I know there is no good way to implement this. The problem
> > is that the Fortran code is called by the process running the python
> > shell. Therefore the two cannot be distinguished at the operating
> > system level. That said, it would be dangerous if python actually
> > heeded your request and ceased running the module midway through
> > because it might cause memory leaks or undefined behaviour since there
> > is no way for python to know what Fortran is actually doing so that it
> > can stop at an opportune time.
> >
> > On 1/5/11, Mark Andrews <[email protected]> wrote:
> >> Hi,
> >> I have a simple question, sorry if the answer is out there and my
> >> googling missed it.
> >> To cancel or interrupt a running python script inside a python shell
> >> like e.g., ipython, I press 'ctrl+c'.
> >> If I write a pure fortran program and run it from a linux bash shell,
> >> I can also cancel by pressing "ctrl+c".
> >> However, if I write a fortran module for python using f2py and run
> >> that in a python shell, I can not cancel with "ctrl+c". The only way I
> >> can interrupt it is (with linux) issuing a kill command to the entire
> >> python shell process.
> >> I was wondering if there is something I am missing? Is there something
> >> I should add to the fortran code or maybe to the f2py command line
> >> flags?
> >> thanks,
> >> Mark
> >>
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> --
> Dr James Kermode, Research Associate
> Department of Physics, King's College London
> Room: Strand 7.33, Tel: +44 (0)20 7848 2064
> http://www.jrkermode.co.uk
>
>
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