func (mb *tcpTransporter) close() (err error) {
	if mb.conn != nil {
		err = mb.conn.Close()
		mb.conn = nil
	}
	return
}
// closeLocked closes current connection. Caller must hold the mutex before calling this method.
closeLocked closes current connection. Caller must hold the mutex before calling this method.
// closeLocked closes current connection . Caller must hold the mutex before calling this method .
func (mb *tcpTransporter) close() (err error) {
	if mb.conn != nil {
		err = mb.conn.Close()
		mb.conn = nil
	}
	return
}
func ( mb * tcpTransporter ) close ( ) ( err error ) { if mb . conn != nil { err = mb . conn . Close ( ) mb . conn = nil } return }
closeLocked closes current connection.
closeLocked closes current connection .