1#![warn(rust_2018_idioms)]
2#![cfg(feature = "full")]
3#![cfg(unix)]
4
5use futures::future::join_all;
6use std::process::Stdio;
7use tokio::process::Command;
8use tokio::task;
9
10#[tokio::test]
11async fn issue_42() {
12 // We spawn a many batches of processes which should exit at roughly the
13 // same time (modulo OS scheduling delays), to make sure that consuming
14 // a readiness event for one process doesn't inadvertently starve another.
15 // We then do this many times (in parallel) in an effort to stress test the
16 // implementation to ensure there are no race conditions.
17 // See alexcrichton/tokio-process#42 for background
18 let join_handles = (0..10usize).map(|_| {
19 task::spawn(async {
20 let processes = (0..10usize).map(|i| {
21 let mut child = Command::new("echo")
22 .arg(format!("I am spawned process #{}", i))
23 .stdin(Stdio::null())
24 .stdout(Stdio::null())
25 .stderr(Stdio::null())
26 .kill_on_drop(true)
27 .spawn()
28 .unwrap();
29
30 async move { child.wait().await }
31 });
32
33 join_all(processes).await;
34 })
35 });
36
37 join_all(join_handles).await;
38}
39