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- Subject: Quick Questions from a Lua Newbie
- From: "dj_mayonaze" <amv256@...>
- Date: Wed, 12 Jun 2002 02:25:06 -0000
Hello, I'm brand new to Lua and have unfortunately had a hard time
finding decent or straightforward documentation on the system thus
far. The docs at lua.org are a reasonable introduction, and the
language itself is obviously very simple to understand and get
familliar with. My problem has been finding good information on
exactly how Lua interfaces with C.
First of all, I do need to use Lua in a "real-time" sense, since I'm
using it to script my game engine and therefore need Lua code
execution to be a concurrent and constant part of my game's main
loop. I've read a bit on the problems associated with this, namely
with the garbage collector causing too much overhead, but I don't do
a whole lot of major allocation so I shouldn't have too much trouble
as far as speed goes.
My real questions are more specific, however. I'll just run through
- First of all, how exactly do I run Lua code from within my program?
I've been able to run scripts with lua_dofile () and all that, which
is fine for initialization routines and other scripts that just need
to be loaded once and immediately executed, but how would I run a
block of code alongside my game's main loop? Basically what I'd like
is the ability to start the execution of a given script and have that
run until I explicitly tell it to stop. Since I know Lua itself isn't
multithreaded in any way, I'd expect to have to run a perpetuating
function at each iteration of my loop (or something), but I can't
find anything like this in the documentation. All I can find are ways
to run whole scripts in a single burst.
- How do I load code for future use? lua_dofile () just seems to load
the code once and then immediately execute it. I need to know how to
load a script without executing it and let it sit in memory until I
need it, at which point I can call Lua functions directly, read/write
global variables, or whatever. Also, is this generally how Lua is
used in real time purposes? In other words, do most games (and other
real-time apps) simply load a script at the time of initialization
and then manually call a DoFrame ()-type Lua function explicitly each
time through their game's loop? That'd work fine for me, so any
details on how this works would be great.
- lua_dobuff () executes a buffer of compiled Lua code in memory, but
how do you get this buffer in the first place? I can't find any
functions for just loading a Lua binary into memory, and I doubt I
have to go as far as writing a compiled Lua script loader just to
extract this data.
Thanks in advance for any help you guys can offer. :) Also, I'm only
a newbie as far as Lua goes, so feel free to go into as much detail
as necessary. I'm also interested in under-the-hood info on Lua as
well, so if any references to low-level VM-related stuff would be