pub fn len(&self) -> usize {
        max(
            self.head.load(Ordering::Relaxed) - self.tail.load(Ordering::Relaxed),
            0,
        )
    }
/// Get the length of the queue.
Get the length of the queue.
Get the length of the queue .
pub fn len(&self) -> usize {
        max(
            self.head.load(Ordering::Relaxed) - self.tail.load(Ordering::Relaxed),
            0,
        )
    }
pub fn len ( & self ) -> usize { max ( self . head . load ( Ordering :: Relaxed ) - self . tail . load ( Ordering :: Relaxed ) , 0 , ) }
Get the length of the queue.
Get the length of the queue .
&self
&self