Method remove_current

thread/thread.cpp:654–663

#endif
        }
        Switch remove_current(states new_state) const {
            assert(!current->single());
            auto from = current;
            auto to = from->remove_from_list();
            set_current(to);
            prefetch_context(from, to);
            from->state = new_state;
            to->state = states::RUNNING;
            return {from, to};
        }
        Switch _do_goto(thread* to) const {
            auto from = current;
            prefetch_context(from, to);