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use std::env;
use std::io::prelude::*;
use std::io::BufReader;
use std::process::{Command, Stdio};
use std::sync::mpsc;
use std::thread;
use jobserver::Client;
macro_rules! t {
($e:expr) => {
match $e {
Ok(e) => e,
Err(e) => panic!("{} failed with {}", stringify!($e), e),
}
};
}
fn main() {
if env::var("I_AM_THE_CLIENT").is_ok() {
client();
} else {
server();
}
}
fn server() {
let me = t!(env::current_exe());
let client = t!(Client::new(1));
let mut cmd = Command::new(me);
cmd.env("I_AM_THE_CLIENT", "1").stdout(Stdio::piped());
client.configure(&mut cmd);
let acq = client.acquire().unwrap();
let mut child = t!(cmd.spawn());
let stdout = child.stdout.take().unwrap();
let (tx, rx) = mpsc::channel();
let t = thread::spawn(move || {
for line in BufReader::new(stdout).lines() {
tx.send(t!(line)).unwrap();
}
});
for _ in 0..100 {
assert!(rx.try_recv().is_err());
}
drop(acq);
assert_eq!(rx.recv().unwrap(), "hello!");
t.join().unwrap();
assert!(rx.recv().is_err());
client.acquire().unwrap();
}
fn client() {
let client = unsafe { Client::from_env().unwrap() };
let acq = client.acquire().unwrap();
println!("hello!");
drop(acq);
}