Elegant exceptionhandling in OpenMP

Question

OpenMP forbids code which leaves the openmp block via exception. Therefore I\'m looking for a nice way of getting the exceptions from an openmp block with the purpose of rethrow

Answer 1

You can utilize a few more C++11 tools to clean up the syntax a bit. Add this variadic member function to your ThreadException class:

class ThreadException {

    // ...

    template <typename Function, typename... Parameters>
    void Run(Function f, Parameters... params)
    {
        try 
        {
            f(params...);
        }
        catch (...)
        {
            CaptureException();
        }
    }
 };

Then when calling inside an OpenMP construct use a lambda function like so:

ThreadException e;

#pragma omp parallel for
for (int i = 0; i < n; i++)
{
    e.Run([=]{
        // code that might throw
        // ...
    });
}
e.Rethrow()