use std::sync::{Arc, Mutex};
use std::thread;
use std::sync::mpsc::channel;

fn main() {
  let locked_data = Arc::new(Mutex::new(0));

  let locked_data_handle = locked_data.clone();
  std::thread::spawn(move || {
    let mut unlocked = locked_data_handle.lock().unwrap();
    *unlocked += 1;
  }).join();

  println!("{}", locked_data.lock().unwrap());
}