Re: using SCM_SMOB_PREDICATE during GC

[Michael Livshin]

"Lars J. Aas" <address@hidden> writes:

> I wrote something like this (guile 1.4) recently:
> 
> static SCM
> my_smob_mark( SCM smob )
> {
>   SCM_ASSERT( SCM_SMOB_PREDICATE(smob_type, smob),
>     smob, SCM_ARG1, "internal smob mark" );
>   ...
> }
> 
> I know it's unnecessary, but I wrote it just for the hell of it :)
> Anyways, it always triggered the assert, so I'm led to believe that
> there's a bit that's set during the mark sweep that is included when
> extracting the smob-type from the smob (haven't investigated this).

that's right (it's the mark bit).

> If that is the case, it should probably be masked out.

the CVS Guile doesn't have this problem (so 1.6.0 won't have it
either).

-- 
What is this talk of 'release'? Klingons do not make software
'releases.' Our software 'escapes' leaving a bloody trail of designers
and Quality Assurance people in its wake.
                                        -- Klingon Programmer