lib/Mutex.php
public function unlock()
    {
        if ($this->fp !== null) {
            flock($this->fp, LOCK_UN);
            fclose($this->fp);
            $this->fp = null;
        }

        return true;
    }
public function unlock()
    {
        if ($this->fp !== null) {
            flock($this->fp, LOCK_UN);
            fclose($this->fp);
            $this->fp = null;
        }

        return true;
    }
public function unlock ( ) { if ( $ this -> fp !== null ) { flock ( $ this -> fp , LOCK_UN ) ; fclose ( $ this -> fp ) ; $ this -> fp = null ; } return true ; }
Realese the mutex

@return  boolean
Realese the mutex