Re: Thread in library which call Lua function

[jseb <gmane2010@...>]

On 15/04/2011 20:51, Roberto Ierusalimschy wrote:
> > I think i have a serious problem here, and i'm not waiting for you
> > for debugging my experiments. Which annoys me is that i was trying
> > to write a short program for isolating another problem i encounter
> > with re-entrance in Lua :(
> > So, i'm opened to all suggestions for solving the drifting problem.
>
> Did you try compiling Lua with LUA_USE_APICHECK defined?
>
> -- Roberto

No, i didn't knew this option.
I've built a Lua interpreter with this flag, and i get some more verbose 
errors now:

lua_apicheck: lapi.c:432: lua_pushnumber: Assertion `L->top < 
L->ci->top' failed.

with
#define api_incr_top(L)   {api_check(L, L->top < L->ci->top); L->top++;}


This time, it was in "lua_pushnumber", but i've also seen it in 
"lua_rawgeti".

Sometimes, my program works for some time (two or three iterations in 
the thread, which call succesfully the lua callback function).

I know the problem is in my callback C function, in the DLL:

    lua_rawgeti (L_context, LUA_REGISTRYINDEX, index_fx_lua);
    lua_pcall(L_context, 0,0,0);

When i comment both two lines, it doesn't hang anymore.

When i comment the second line (lua_pcall), it still hang after three 
iterations, on this assert:
lua_apicheck: lapi.c:573: lua_rawgeti: Assertion `L->top < L->ci->top' 
failed.

For what i understand, it's something weird with the stack manipulation 
(good guess Sherlock, now time to go to bed).