Suppose I have a perl callback that is called from C level like this

    call_sv((SV*)my_callback, G_VOID|G_DISCARD|G_EVAL);
    if (SvTRUE(ERRSV)) {
       /* do something */
       croak("%s", SvPV_nolen(ERRSV));
    }
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This code works if $@ is a string. But if $@ is an object it is converted into a string.

I'd like to use in my_callback code like this:

die My::Error->new(...);
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and catch the object, not it's stringification later in perl again. So I need to reraise the exact $@ object in C.

Thanks,
Torsten