Great! Thanks for finding this out :)
William Chèvremont said: (by the date of Thu, 10 Oct 2019 11:13:23 +0200)
> Ok got it.
>
> The problem come from the Global Interpreter Lock from Python. run()
> seems to run the code in an other thread as step() run the code in the
> same thread as python. So, when calling the function via step(), the
> lock is already acquired by the thread. On the other hand, run() is into
> a different thread, and the lock has to be acquired manually.
>
> Using boost, I was expecting an exception instead of crash for this kind
> of error.
>
> Functions should look like:
>
> virtual Real contactForce(Real const& u) const {
> TRACE;
> gilLock lock; // Acquire GIL. (from pyutils/gil.hpp)
> LOG_TRACE("GIL State: " << PyGILState_Check());
> return get_override("contactForce")(u);
> }
>
> I'll update the doc about subclassing c++ in python, as this is
> mandatory for all python code called from C++ while running O.run().
> William.
>
>
>
> On 08/10/2019 13:22, William Chèvremont wrote:
> >
> > Hi,
> >
> > Yes, there are the same behaviour with and without wait.
> >
> > William
> >
> >
> > On 08/10/2019 12:57, Bruno Chareyre wrote:
> >> Hi William,
> >> I don't know precisely but in case it can help I would raise that the
> >> main difference between step() and run() is Py_BEGIN_ALLOW_THREADS,
> >> at least if O.run(...,wait=True).
> >> Do you have the same problem with and without "wait"?
> >>
> >> Simply passing to c++ a python expression (just a string with python
> >> commands) or a python function returning a value - instead of a
> >> derived class object - could be a simple workaround maybe.
> >>
> >> Bruno
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Tue, 8 Oct 2019 at 10:56, William Chèvremont
> >> <william.chevrem...@univ-grenoble-alpes.fr
> >> <mailto:william.chevrem...@univ-grenoble-alpes.fr>> wrote:
> >>
> >> Hi,
> >>
> >> @Janek
> >>
> >> Yes, I'm aware of the doc about subclassing types in python.
> >> There are
> >> no problem about that, since it works when calling O.step()
> >> instead of
> >> O.run().
> >>
> >> @Anton
> >>
> >> The complete backtrace is attached to this mail. Functions of
> >> interests
> >> are around line 400.
> >>
> >> Best Regards,
> >>
> >> William
> >>
> >>
> >> On 07/10/2019 18:19, Janek Kozicki (yade) wrote:
> >> > Only a quick question to make sure - you have read
> >> https://yade-dem.org/doc/prog.html#subclassing-c-types-in-python
> >> in documentation?
> >> >
> >> >
> >> > best regards
> >> > Janek
> >> >
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> >>
> >>
> >> --
> >> --
> >> _______________
> >> Bruno Chareyre
> >> Associate Professor
> >> ENSE³ - Grenoble INP
> >> Lab. 3SR
> >> BP 53
> >> 38041 Grenoble cedex 9
> >> Tél : +33 4 56 52 86 21
> >> ________________
> >>
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> >>
> >
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--
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Gdańsk University of Technology
Faculty of Applied Physics and Mathematics
Department of Theoretical Physics and Quantum Information
--
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