use std::sync::{Arc, Mutex};
use std::collections::VecDeque;
use std::thread::{self, sleep};
use rand::Rng;
use std::time::Duration;fn main() {let list: Arc<Mutex<VecDeque<String>>> = Arc::new(Mutex::new(VecDeque::new()));// 创建修改线程let list_clone = list.clone();let mutator = thread::spawn(move || {let mut rng = rand::thread_rng();loop {let random_operation = rng.gen_range(0..3); // 随机选择操作：0-添加到前端，1-添加到后端，2-随机删除let value = rng.gen_range(1..101).to_string(); // 生成随机数作为值let mut list_guard = list_clone.lock().unwrap(); // 获取互斥锁的所有权match random_operation {0 => list_guard.push_front(value.clone()), // 添加到前端1 => list_guard.push_back(value.clone()),  // 添加到后端2 => {if let Some(_) = list_guard.pop_front() {} // 尝试从前端删除}_ => {}}drop(list_guard); // 显式释放锁thread::sleep(Duration::from_millis(100)); // 模拟操作之间的延迟}});// 创建查询线程let list_clone = list.clone();let observer = thread::spawn(move || {loop {let list_guard = list_clone.lock().unwrap(); // 获取互斥锁的所有权println!("Current state of the deque: {:?}", list_guard);drop(list_guard); // 显式释放锁thread::sleep(Duration::from_millis(500)); // 模拟查询之间的延迟}});// 这里我们让主线程等待，直到两个线程都完成let _ = mutator.join();let _ = observer.join();}