环境
- Time 2022-01-14
- Rust 1.58.0
- Tokio 1.15.0
概念
参考:https://docs.rs/tokio/latest/tokio/macro.join.html
示例
main.rs
use std::time::Duration;
use tokio::time::{sleep, Instant};
async fn time_sleep(time: u64) -> u64 {
sleep(Duration::from_secs(time)).await;
time
}
#[tokio::main]
async fn main() {
let now = Instant::now();
let (first, second) = tokio::join!(time_sleep(1), time_sleep(2));
let time = now.elapsed().as_millis();
println!("elapsed: {time} ms, first: {first}, second: {second}");
}
输出
等待最久的任务完成后才结束。
elapsed: 2001 ms, first: 1, second: 2
总结
join!
宏可以等待所有任务完成。