use std::time::Duration;

use tokio::{join, select};
use tokio::sync::oneshot::channel;

#[tokio::main]
async fn main() {
    let (tx1, rx1) = channel::<i32>();

    let a = tokio::spawn(async move {
        tokio::time::sleep(Duration::from_millis(2000)).await;
        let _ = tx1.send(1);
        println!(">>> send tx1");
    });

    select! {
        a = rx1 => {
            println!("tx: {:?}", a);
        }
        b = run() => {
            println!("run: {:?}", b);
        }
        c = tokio::time::sleep(Duration::from_millis(1500)) => {
            println!("timeout: {:?}", c);
        }
    }

    println!("join: {:?}", join!(a));

    println!(">> pre end");
    tokio::time::sleep(Duration::from_millis(2000)).await;
    println!(">> end");
}

async fn run() {
    for i in 0.. {
        tokio::time::sleep(Duration::from_millis(300)).await;
        println!("# {}", i);
    }
}