Re: Prevent userdata from being marked for garbage collection?

[Carsten Fuchs <carsten.fuchs@...>]

Hi Peter,

Am 2012-07-04 00:37, schrieb Peter Cawley:
> [...] look at the sweeplist function in lgc.c, and have it
> resurrect userdata which are otherwise dead.
>
> Alternatively, if you're willing to take advantage of some
> implementation warts, you can resurrect objects from their __gc
> handler. [...]
>
> To round off, it probably doesn't need saying, but the cleanest
> approach would be to work within the existing metamethods and garbage
> collection semantics.

Thanks for pointing me to the relevant internals!

If anyhow possible, I'd prefer to find a clean and stable solution that works with Lua 
unmodified and as officially documented, so I'll check out these approaches first.

If that fails, I'll happily start studying the Lua internals though (something that I've 
long been planning and looking forward to do, but have never been able to find enough 
time for).

(And well, honestly, despite my rather fruitless prior web searches, I secretly hoped 
that I was not the only or first one to ask for a __mask-like callback, and that someone 
with more knowledge than me had found a solution before...)

Still, many thanks for your help!

Best regards,
Carsten



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