CGAL users discussion list

[Ioannis <>]

Hello,

>It is not possible to make reference-counting thread-safe without slowing
>down single-threaded applications, so this hasn't been done yet. It is
>safe to use different Gmpq in different threads (as opposed to Gmpzf which
>may only be used in a single thread), but not to share one between
>threads.

>You could try to use a type that does not use reference counting
>(mpq_class (from gmpxx.h) instead of Gmpq). 

I am using CCAL 4.0 with with Exact_predicates_exact_constructions kernel
and my multithreaded code fails occasionally.
Is the thread unsafe reference counting still an issue in the new version? 
The same problem I have with multithreading and the Cartesian<Cgal::Gmpq>
kernel. 
Is the Simple_cartesian<mpq_class> the only alternative solution and how
slow could that be comparing to the other kernels? 
I saw in an older post that some filtering could speed it up but I am not
sure what does that mean in this context and how can I use it in my code.  

Best Regards




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