Method rollback

nodedb/src/control/sequence/gap_free.rs:142–149

Rollback a reservation: decrement the counter, recycle the number. Releases the per-sequence lock so the next caller can proceed. `rollback_fn` is called to decrement the sequence counter by one increment.

(&self, handle: &ReservationHandle, rollback_fn: impl FnOnce())

    ///
    /// `rollback_fn` is called to decrement the sequence counter by one increment.
    pub fn rollback(&self, handle: &ReservationHandle, rollback_fn: impl FnOnce()) {
        rollback_fn();

        let locks = self.locks.lock().unwrap_or_else(|p| p.into_inner());
        if let Some(lock) = locks.get(&handle.sequence_key) {
            self.unlock_sequence(lock);
        }
    }

    /// Release the per-sequence lock and wake one blocked waiter.
    fn unlock_sequence(&self, lock: &SequenceLock) {