Re: Use lua_State as local variable in C function call, but not to load instructions each time

[Asko Kauppi <askok@...>]

You can of course use precompiled scripts, but even then setting up  
the Lua state will take some time & code.

An approach I've used in Lua Lanes is to have forever-looping server  
threads, who exchange data over receive/send connection with others.  
In fact, Lanes has grown now to a fairly OS-kernel-like set of  
features (threads ~ processes), which indeed is a part of my vision  
of a "virtual" operating system.

But maybe my "answer" is more than you were asking. What you'd want  
(imho) is ability to 'clone' the template lua_State after loading  
'test.lua', and then be able to close those clones after usage. Maybe  
you can twist 'lua_newthread()' to do this?

Good luck. :)
-asko


Huang Lin kirjoitti 2.6.2007 kello 18:23:

> Hi there,
>
> I use lua in this way in my C program.
>
> int getPrompt (char* output)
> {
>         lua_State *L = lua_open();  /* create state */
>
>         if (luaL_loadfile(L, "test.lua") || lua_pcall(L, 0, 0, 0))
>         {
>
>         }
>         /// other lua logic to get output
>         lua_close(L);
> }
> By using a local lua_State, the C program can begin the LUA logic  
> from a fresh environment. This is also helpful when the C function,  
> getPrompt, was run in multithread environment that doesn't require  
> LUA related data to be shared/exchanged between threads.
>
> But it is expensive to load the LUA instructions each time when I  
> just want a local and fresh LUA runtime environment.
>
> Is it possible to load/compile the LUA scripts once, put the result  
> in the memory, and let the local lua_State(an independent lua  
> universes) use it?
>
> Thanks,
> Huang Lin