yue emit sketch

gistfile1.cpp

int signal::operator () (int signo) {
    event::signal ev = { signo };
    emit(ev);
}

struct emittable {
    struct wait : public callable {
        static int init(VM vm) { return callable::init<wait>(vm); }
        static int call(VM vm);
    };
}

int lua::emittable::wait::call(VM vm) {
    wait *w = reinterpret_cast<wait *>(lua_touserdata(vm, -1));
    U32 t_o = 0; future *ft = NULL;
    if (w->timed()) {
        t_o = lua_tointeger(vm, -2);
    }
    if (w->async()) {
        ft = reinterpret_cast<future *>(lua_touserdata(vm, -3));
    }
    coroutine *co = coroutine::to_co(vm);
    lua_error_check(vm, co, "to_co");
    MSGID msgid = emittable::add_watcher(w->emitter(), *co);
    lua_error_check(vm, msgid != serializer::INVALID_MSGID, "add_watcher");
    return ft ? 1 : co->yield();
}