Index: modules/system/system.queue.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.queue.inc,v
retrieving revision 1.7
diff -r1.7 system.queue.inc
138a139,147
>    * Release an item that the worker could not process, so another
>    * worker can come in and process it before the timeout expires.
>    *
>    * @param $item
>    * @return boolean
>    */
>   public function releaseItem($item);
> 
>   /**
218a228,236
>   public function releaseItem($item) {
>     $update = db_update('queue')
>       ->fields(array(
>         'expire' => 0,
>       ))
>       ->condition('item_id', $item->item_id);
>       return $update->execute();
>   }
>