src/PEAR/DependencyDB.php
function _unlock()
    {
        $ret = $this->_lock(LOCK_UN);
        if (is_resource($this->_lockFp)) {
            fclose($this->_lockFp);
        }
        $this->_lockFp = null;
        return $ret;
    }
function _unlock()
    {
        $ret = $this->_lock(LOCK_UN);
        if (is_resource($this->_lockFp)) {
            fclose($this->_lockFp);
        }
        $this->_lockFp = null;
        return $ret;
    }
Release usage of dependency DB
@return true|PEAR_Error
@access private