#6391: libGAP! -- create a Cython library interface to gap
---------------------------+------------------------------------------------
Reporter: was | Owner: was
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.6.2
Component: interfaces | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by dimpase):
Replying to [comment:23 was]:
> Replying to [comment:22 dimpase]:
> > in the class GapElement, _div_ and other member functions can
potentially fail (as demonstrated in the comment "This log pretty much
explains what/why/what next:..." above), e.g. due to division by 0. It is
meant that the corresponding checks are to be implemented in these member
functions? I guess not, it's rather a matter of properly catching the
corresponding GAP interrupts, right?
> >
>
> Yes. I don't know if GAP uses "interrupts" though. You are basically
above asking: "Here is a problem nobody has solved yet, which is why
libgap hasn't moved forward. What is the solution?"
>
From printing contents of the GAP interpreter output_buffer (introduced in
the patch of GAP's scanner.c), I see that during the fatal
a._div_(g.libgap('0'))_ it starts getting the contents of the usual GAP
error message, like Entering break read-eval-print loop (i.e. it does a
"GAP interrupt"). And then the crash happens in the Python interpreter. So
I suppose more reverse engineering/understanding of the GAP interpreter is
needed here, in order to avoid replicating it in Python...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6391#comment:24>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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