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sync: add watch::Sender::sender_count #6836

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Oct 11, 2024
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23 changes: 23 additions & 0 deletions tokio/src/sync/watch.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1325,6 +1325,29 @@ impl<T> Sender<T> {
self.shared.ref_count_rx.load(Relaxed)
}

/// Returns the number of senders that currently exist.
///
/// # Examples
///
/// ```
/// use tokio::sync::watch;
///
/// #[tokio::main]
/// async fn main() {
/// let (tx1, rx) = watch::channel("hello");
///
/// assert_eq!(1, tx1.sender_count());
///
/// let tx2 = tx1.clone();
///
/// assert_eq!(2, tx1.sender_count());
/// assert_eq!(2, tx2.sender_count());
/// }
/// ```
pub fn sender_count(&self) -> usize {
self.shared.ref_count_tx.load(Relaxed)
}

/// Returns `true` if senders belong to the same channel.
///
/// # Examples
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