* This will cause \a schedule() to return immediately because both the
* \a pre_select_list and the \a post_select_list are empty. This function
* must be called from the post_select (rather than the pre_select) method.
* This will cause \a schedule() to return immediately because both the
* \a pre_select_list and the \a post_select_list are empty. This function
* must be called from the post_select (rather than the pre_select) method.