// clear the cancel io data
// should be called after io completion
clear the cancel io data
should be called after io completion
clear the cancel io data should be called after io completion
pub fn clear(&self) {
        if self.co.take(Ordering::Acquire).is_none() {
            self.io.clear();
        }
    }
pub fn clear ( & self ) { if self . co . take ( Ordering :: Acquire ) . is_none ( ) { self . io . clear ( ) ; } }
clear the cancel io data
should be called after io completion
clear the cancel io data should be called after io completion
&self