Method subscribe

nodedb/src/control/shutdown/watch.rs:42–44

Subscribe a new receiver. Always reflects the current state — a receiver created after [`signal`] has been called observes the signal on its first poll of `wait_cancelled`, so there is no "signal arrived before I subscribed" race. [`signal`]: Self::signal

(&self)

    ///
    /// [`signal`]: Self::signal
    pub fn subscribe(&self) -> ShutdownReceiver {
        ShutdownReceiver::from_watch(self.tx.subscribe())
    }

    /// Flip the shutdown flag. Idempotent — calling twice is a
    /// no-op, and the second call does NOT wake subscribers