CGAL users discussion list

[Cody Rose <>]

On 10/26/2011 9:50 PM, Sebastien Loriot (GeometryFactory) wrote:
> Cody Rose wrote:
> > Hello,
> >
> > Can nef polygons be used with Microsoft's PPL? The following code 
> > (CGAL 3.8) crashes during construction of either nef_polygon, even 
> > with CGAL_HAS_THREADS defined:
> >
> > #include <cstdio>
> > #include <ppl.h>
> > #include <concurrent_vector.h>
> > #include <CGAL/Extended_cartesian.h>
> > #include <CGAL/CORE_Expr.h>
> > #include <CGAL/Nef_polyhedron_2.h>
> >
> > typedef CORE::Expr NT;
> > typedef CGAL::Extended_cartesian<NT> K;
> > typedef CGAL::Nef_polyhedron_2<K> nef_polygon;
> >
> > int main() {
> >     Concurrency::parallel_invoke(([]() { nef_polygon p; }), ([]() { 
> > nef_polygon q; }));
> >     printf("success\n");
> >     return 0;
> > }
> >
> > If this doesn't work, are nef polygons otherwise concurrency-safe? 
> > (i.e. should using them with boost::thread, for example, work?)
> >
> > Cody
> From what I know, the implementation has not been done while
> thinking about thread-safety, so I would not expect it to be.
>
> Sebastien.

I actually got in touch with the creators of CORE and they said that the 
whole CORE library isn't thread-safe, unfortunately, but thank you for 
your response.

Cody