Re: calling collectgarbage in __gc metamethod

[Atilim Cetin <atilim.cetin@...>]

I've just met this interesting behavior while writing my Box2d
wrapper. I don't know if it's a bug or not but Lua 5.1.4 avoids GC
steps while running a __gc metamethod.

On Mon, Aug 6, 2012 at 7:58 PM, Coda Highland <chighland@gmail.com> wrote:
> On Mon, Aug 6, 2012 at 9:55 AM, Atilim Cetin <atilim.cetin@gmail.com> wrote:
>> Hi,
>>
>> When I call collectgarbage in a __gc metamethod, Lua GC tries to collect
>> another userdata and therefore calls another __gc metamethod before
>> finishing the current one. And destructing two objects simultaneously
>> results in crashing. I'm using Lua 5.1.4.
>>
>> Do you know a way to avoid this situation?
>>
>> Thank you.
>>
>> --
>> Atilim Cetin
>>
>
> "Doctor, it hurts when I do this."
>
> Don't call collectgarbage in a __gc metamethod?
>
> I mean, I don't know what the technical details involved here are, but
> this sounds intuitively like a big no-no. What are you trying to
> accomplish, anyway?
>
> /s/ Adam
>