You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: waiter_queue.rs
    path of file: ./repos/occlum/src/libos/src/events
    
    the code of the file until where you have to start completion: use std::collections::VecDeque;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::time::Duration;

use super::{Waiter, Waker};
use crate::prelude::*;

/// A queue fo
    
    pub fn dequeue_and_wake_nr(&self, max_count: usize) -> usize {
        // The quick path for a common case
        if self.is_empty() {
            return 0;
        }

        // Dequeue wakers
        let to_wake = {
            let mut wakers = self.wakers.lock().unwrap();
            let max_count = max_count.min(wakers.len());
            let to_wake: Vec<Waker> = wakers.drain(..max_count).collect();
            self.count.fetch_sub(to_wake.len(), Ordering::Release);
            to_wake
        };

        // Wake in batch
        Waker::batch_wake(to_wake.iter());
        to_wake.len()
    }