Re: smob mark functions in 2.0

[Andy Wingo]

On Thu 24 Nov 2011 00:12, address@hidden (Ludovic Courtès) writes:

>> So, your mark function might see freed objects.  This is terrible, but
>> it is the way that it is.  The key is that, if you touch a Scheme object
>> in your mark function, to first do a check on that object, to see that
>> it is valid.  You can check the TC bits of the first word, or otherwise
>> check that other words are non-NULL.
>
> What about making that check in libguile before invoking the user’s mark
> function?

Yes, we do that.  I think you wrote that code!  The problem was in a
mark function, accessing *other* Scheme objects.

Andy
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