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add len() to Stealer #708

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merged 1 commit into from May 31, 2021
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add len() to Stealer #708

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21 changes: 21 additions & 0 deletions crossbeam-deque/src/deque.rs
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Expand Up @@ -588,6 +588,27 @@ impl<T> Stealer<T> {
b.wrapping_sub(f) <= 0
}

/// Returns the number of tasks in the deque.
///
/// ```
/// use crossbeam_deque::Worker;
///
/// let w = Worker::new_lifo();
/// let s = w.stealer();
///
/// assert_eq!(s.len(), 0);
/// w.push(1);
/// assert_eq!(s.len(), 1);
/// w.push(2);
/// assert_eq!(s.len(), 2);
/// ```
pub fn len(&self) -> usize {
let f = self.inner.front.load(Ordering::Acquire);
atomic::fence(Ordering::SeqCst);
let b = self.inner.back.load(Ordering::Acquire);
b.wrapping_sub(f).max(0) as usize
}

/// Steals a task from the queue.
///
/// # Examples
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