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Postings from November 2003
On Fri, Nov 14, 2003 at 11:31:22PM +0000, Alan Burlison wrote:
> I have a module (Solaris::Kstat) which implements a tied hash entirely from
> XSUB code. This works fine in 5.6.1, but cores in 5.8.2. I've added some
Could you try 5.8.0 and 5.8.1 easily? The hv_clear code seems to have
changed very little between 5.6.1 and 5.8.0, but 5.8.1 and 5.8.2 add
progressively more.
> debug code, and whilst all the other XSUB tied hash methods are being
> called correctly, CLEAR isn't - it looks like Perl_hv_clear() is being
> called rather than the tied CLEAR method. The stack trace looks like this:
>
> Perl_hv_clear
> Perl_pp_aassign
> Perl_runops_standard
> S_run_body
> perl_run
> main
>
> i.e. no sign of the XSUB CLEAR method. I haven't had time to nail this
> down yet, but being lazy I wondered if anyone else had seem the same
> problem?
I guess that the CLEAR gets invoked by hv_clear, as this:
if (SvRMAGICAL(hv))
mg_clear((SV*)hv);
but I don't actually know how hash magic works here.
[IIRC fetch and store magic works by returning a scalar with magic
linking back to the hash, which runs a sort-of callback if that scalar
is accessed]
Nicholas Clark
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