Function GetLuaThread

engine/script/src/script.cpp:336–346

From ldblib.c (getthread)

    // From ldblib.c (getthread)
    static lua_State* GetLuaThread(lua_State *L, int *arg)
    {
        if (lua_isthread(L, 1)) {
            *arg = 1;
            return lua_tothread(L, 1);
        }
        else {
            *arg = 0;
            return L;
        }
    }

    // From https://zeux.io/2010/11/07/lua-callstack-with-c-debugger/
    // and also