CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

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.