ERunActions background process issue

Question

I am using Yii ERunActions to delete huge files in background, it works as gem but after deleting files it doesn't return to ajax success, where I refresh grid after deleting files, I dont know where I made mistake ??

Controller Action :

public function actionBCDelete()
    {

    if (ERunActions::runBackground())
     {
       Campaign::model()->deleteAllByAttributes(array("crm_filter_id"=> $_POST["id"]));
       FilterModel::model()->deleteByPk($_POST["del_id"]);
       SourceModel::model()->deletebyPk($_POST["del_source"]);
      }
}

Ajax call:

$.ajax({
        type: "POST",
        url: "'.$this->createUrl("baseContact/BCDelete").'",  
        data: {"id" : fileid ,"del_source" : del_source , "del_id" : del_id },
        async:true,
        success: function(data){
            $.fn.yiiGridView.update("basefilter-grid"); 
        },
        error: function(data){
            alert("Failure");
        }
});`

Controller action returns to success before deleting files , but i want to return to success after deleting all files for grid to refresh, can anyone guide me to make it work!!!