CGAL users discussion list

[Marc Glisse <>]

On Sun, 29 Jan 2012, Bernhard Kornberger wrote:

> I use CGAL 3.9 and my multithreaded code fails occasionally. Now I'd
> like to ask if the respective part of CGAL is thread safe? Here is a
> code snippet:
>
> ***
> #define CGAL_HAS_THREADS
> typedef CGAL::Exact_predicates_exact_constructions_kernel K;
>
> class ESegment_3 : public K::Segment_3
> {
>  ...
> }
>
> EPoint_3* ESegment_3::splitLowPoint(const K::Line_3& axLin)
> {
>  if(CGAL::do_intersect(*this,axLin)) // Line 582
>  {
>  }
> }
> ***
>
> There are 8 std::vector<ESegment*>, and they are treated by 8
> separate threads. Each ESegment is unique. Here is a backtrace,
> created with gdb:

If no object is accessed from 2 different threads, you should be fine...
(by the way, it looks like you are profiling your code, which doesn't 
always work great with multiple threads)

--
Marc Glisse