mutithread error handle

[dogeFu]

I set a lua function as a callback in C++.

In a child thread ,I call a "run_in_main_thread" function , to call this callback in main thread. (because
this callback can not be called in child thread ).

the problem is , when this callback cause some errors , the catch code In CppBindingModule.h doesn't trigger.

 struct CppBindMethodBase{
    static int call(lua_State* L)
     {
         try {
             assert(lua_isuserdata(L, lua_upvalueindex(1)));
             const FN& fn = *reinterpret_cast<const FN*>(lua_touserdata(L, lua_upvalueindex(1)));
            assert(fn);
            CppArgTuple<P...> args;
           CppArgTupleInput<P...>::get(L, IARG, args);
            int n = CppInvokeMethod<FN, R, typename CppArg<P\>::HolderType...>::push(L, fn, args);
            return n + CppArgTupleOutput<P...>::push(L, args);
         } catch (std::exception& e) {

            //！！！  when error accur, this catch code didnot run. ！！！
            return luaL_error(L, e.what());

         }
     }
 }

e.g: my callback is:

function callback()
     error(1)
end

ps:

when I called this same callback in main thread ,the catch code worked.

Any idea why this happen? I am not familiar with these mutithread things between lua and C++,any detailed description is really appreciated !