How wordpress send pingbacks and etc. ?

Hello, i have my own wordpress content update scripts, i insert posts in datebase via sql request, also i add this $wpdb->query(“INSERT INTO “.$wpdb->prefix.”postmeta (post_id,meta_key,meta_value) VALUES (“.$post_id.”,’_pingme’,’1′)”) for every added post, but i am not using wordpress standart function wp_inser_post(). And now i have one trouble with this, how can i send pingbacks to search engines and other blogs, after i have been added new posts in database ? I tryed to use wordpress function do_all_pings() – after that script runs very long time more then 1 hour ?? then i just stoped it, and another my way wp_schedule_event(time(), ‘do_pings’) – but after that, script finished, all my functions done, but i don`t know have wordpress send pingbacks or not (( how can i check this … ?

At least i need somebody to explain me how to send pingbacks, if i have $post_id, what function i need to use ?