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use std::sync::mpsc::{channel, Receiver, Sender}; use std::sync::{Arc, Mutex}; pub struct BlockingQueue<T> { sender: Sender<T>, receiver: Arc<Mutex<Receiver<T>>>, } impl<T> BlockingQueue<T> { pub fn new() -> Self { let (sender, receiver) = channel(); Self { sender: sender, receiver: Arc::new(Mutex::new(receiver)), } } pub fn push(&self, e: T) { self.sender.send(e).unwrap(); } pub fn pop(&self) -> T { self.receiver.lock().unwrap().recv().unwrap() } } impl<T> Clone for BlockingQueue<T> { fn clone(&self) -> Self { Self { sender: self.sender.clone(), receiver: self.receiver.clone(), } } } #[cfg(test)] mod tests { use super::*; use std::{thread, time}; #[test] fn test_1() { let bq = BlockingQueue::new(); bq.push(123); bq.push(456); bq.push(789); assert_eq!(bq.pop(), 123); assert_eq!(bq.pop(), 456); assert_eq!(bq.pop(), 789); } #[test] fn test_2() { let bq = BlockingQueue::new(); let bq0 = bq.clone(); thread::spawn(move || { thread::sleep(time::Duration::from_millis(100)); bq0.push(123); }); let bq1 = bq.clone(); thread::spawn(move || { thread::sleep(time::Duration::from_millis(1000)); bq1.push(456); }); assert_eq!(bq.pop(), 123); assert_eq!(bq.pop(), 456); } }