Re: lua_resume and a C-function as the main coroutine function problem

[Roberto Ierusalimschy <roberto@...>]

> Please consider the following piece of code:
> 
> ---------------------------------------------------------------
> #include <stdio.h>
> #include <lua.h>
> 
> int test(lua_State* L) {
>         printf("test start\n");
>         return lua_yield(L, 0);
> }
> 
> int main() {
>         lua_State* L = luaL_newstate();
>         lua_State* T = lua_newthread(L);
>         luaL_ref(L, LUA_REGISTRYINDEX);
>         lua_pushcfunction(T, test);
>         printf("1st resume: %d\n", lua_resume(T, 0));
>         printf("2nd resume: %d\n", lua_resume(T, 0));
>         lua_close(L);
>         return 0;
> }
> ---------------------------------------------------------------
> 
> In this example, I am trying to use a C-function as the main function
> for lua_resume() call. The program crashes with segfault.
>
> Probably, it is forbidden to use lua_resume() this way, however I
> didn't find any related information neihter in the Lua 5.1 manual nor
> on the Lua users wiki and the whole Internet. [...]

It is forbidden to resume a C function. The manual should mention that.
Thanks for the report.

-- Roberto