CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le Wednesday, February 15, 2017 3:15:01 PM CET Thomas Holzmann a écrit :
> Hi,
> 
> I have a CGAL::Triangulation_3, which I manually created (just converted
> a given triangulation to a CGAL data structure) and which is valid (
> checked with triangulation.is_valid()). I'm currently using
> Exact_predicates_inexact_constructions_kernel, but I'm having problems
> when making various geometric operation afterwards. Therefore, I want to
> change to Exact_predicates_exact_constructions_kernel.
> 
> However, after changing the kernel, the conversion back to a double
> representation doesn't work anymore, ie.
> 
> double x = CGAL::to_double(vertex->point().x());
> ...
> 
> results in a segmentation fault sometimes. It doesn't happen for all
> vertices, just for some.

Could it be that you use parallel threads working both on such CGAL exact 
points? The kernel `Exact_predicates_exact_constructions_kernel` is not 
thread-safe as far as I know.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/