Re: How to stop yielded threads from being garbage collected

[HyperHacker <hyperhacker@...>]

On Thu, Nov 24, 2011 at 03:57, Duncan Cross <duncan.cross@gmail.com> wrote:
> On Wed, Nov 23, 2011 at 11:16 PM, Martin Linklater
> <mslinklater@gmail.com> wrote:
>> Thanks. So after creating the new thread, stack position -1 contains a thread object. When you say to keep a reference to it do I need to create a Lua table entry which contains that thread object ? Or is there a simpler way ?
>>
>> Cheers
>
> What I would do is use the registry table, and create an entry where
> the key is a light-userdata pointer to the thread. Something like
> this:
>
>  // thread object is on the top of L's stack
>  lua_pushlightuserdata(L, lua_topointer(L, -1));
>  lua_pushvalue(L, -2);
>  lua_settable(L, LUA_REGISTRYINDEX);
>
> Later, if you want to remove this entry from the registry table and
> make the thread garbage-collectable again, push another light userdata
> and set its registry table entry to nil.
>
> -Duncan
>

Er, why pushing pointers to the objects instead of the thread itself?

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