Re: Repeating my question

[Julien Cugnière <jcugniere@...>]

Antero Vipunen wrote:
> Hello All,
>
> I have a strange problem with GC.
> I assigned __gc metamaethod for my objects to trace gcollection
> and discovered that when i create luathreads using lua_newthread, run
> some scripts in them and then call lua_setgctreshold(0), all my
> objects become gc'ed except created in thread, that was created last.
>
> Is it a bug or special feature?

I think your problem is that the threads themselves are getting 
collected, followed by the objects they created (if they're not 
referenced from somewhere else).

Remember that threads are regular lua values, and like tables they will 
be collected if they're not referenced anymore. On the C side, 
lua_newthread() returns the state, but it also pushes a thread object on 
the lua stack. You need to keep this value somewhere (like in the 
registry) if you don't want your thread to unexpectedly die...

So, unless I'm mistaken, this a bug of your code and a feature of lua ;-)

--
Julien Cugnière