function releaseLock($pid)
{
    if (strpos($pid, 'ap-image:') > -1) {
        $success = AP_Image::releaseImageLock($pid);
        if ($success != false) {
            echo "success";
        } else {
            echo "false";
        }
    } else {
        if (strpos($pid, 'ap-roi:') > -1) {
            $success = AP_ROI::releaseROILock($pid);
            if ($success != false) {
                echo "success";
            } else {
                echo "false";
            }
        }
    }
}