Re: Lua 5.1 / 5.2 threads

[Anthony Howe <achowe+lua@...>]

On 27/04/2011 16:57, Peter Cawley whispered from the shadows...:
> On Wed, Apr 27, 2011 at 3:53 PM, Anthony Howe <achowe+lua@snert.com> wrote:
>> In Lua 5.1 a thread has an environment and section 2.8 starts with
>> "Every value in Lua can have a metatable." So a thread can also have a
>> metatable in addition to an environment?
> 
> If you continue reading 2.8, then you find the following:
> 
> "Tables and full userdata have individual metatables (although
> multiple tables and userdata can share their metatables). Values of
> all other types share one single metatable per type; that is, there is
> one single metatable for all numbers, one for all strings, etc."

Yes. I had seen that but didn't think to apply it to a complex type like
a thread.

> So every thread can have a metatable, but the granularity for setting
> metatables on threads is such that if one thread has a metatable, then
> all threads have that metatable. As far as I'm aware, this hasn't
> changed between 5.1 and 5.2.

What about the master state (returned by luaL_newstate()) from which a
thread is derived? For the purpose of this question do they have the
same type and status a threads? or are they treated differently?

So if I change the metatable of a master state then all future
lua_State, master or thread, will share the same metatable?


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