Bill Allombert on Sun, 01 Sep 2013 10:17:55 +0200

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Re: pari_err(): callback function instead of longjmp()

On Fri, Aug 30, 2013 at 01:55:31PM +0200, Jeroen Demeyer wrote:
> Hello pari-dev,
> We at Sage are currently revisiting the way we do PARI error
> handling. I remind you we are using PARI-2.5.4 (but I don't think
> that makes such an important difference for this discussion).
> It would be much more useful for Sage to have a callback function
> called from pari_err() instead of a longjmp(). I am talking about
> the following code:

This is already the case, see the documentation of 

> pari_err(int numerr, ...)
> {
>   ...
>   if (s_ERR_CATCH.n)
>   {
>       ...
>       longjmp(*(trapped->penv), numerr);
>       ...
>   }
> What's your opinion on adding the possibility of a callback function
> instead? If you don't like it, we're probably going to do it anyway
> in the Sage "fork" of PARI :-)

I think you are misunderstanding the purpose of this code.