I haven't ever tried this, but I'd start by experimenting with calling 
Base.showerror with jl_exception_in_transit as an argument.

--Tim

On Wednesday, December 16, 2015 02:28:34 AM Kristoffer Carlsson wrote:
> Hello, I've been looking at embedding some material models written in Julia
> in a larger FEM project written in C++ (https://www.dealii.org/).
> 
> I have a few questions that would make improve my workflow.
> 
> 1.) To ease with debugging I would want to get the back trace with line
> numbers from C when an exception is raised. Right now I use:
> 
> void check_exception() {
>  if (jl_exception_occurred()) {
>  jl_show(jl_stderr_obj(), jl_exception_occurred());
>  jl_printf(jl_stderr_stream(), "\n");
>  return -1;
>  }
>  return 0;
> }
> 
> but this only gives me for example:
> DimensionMismatch("A has dimensions (2,1) but B has dimensions (6,6)")
> without any extra information.
> 
> Is there a convenient way to also print out the back trace?
> 
> 2. What is the status of thread safety when calling function with jl_call
> from c(++)? deal.ii has very good support for implementing multithreading
> so it would be nice if I could use julia multithreaded. I know that there
> has been a lot of progress w.r.t thread safety on master but I am not sure
> what the current status is.
> 
> Thanks
> // Kristoffer

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