Function heartbeat_thread

cranelift/filetests/src/concurrent.rs:116–126

Spawn a heartbeat thread which sends ticks down the reply channel every second. This lets us implement timeouts without the not yet stable `recv_timeout`.

(replies: Sender<Reply>)

/// Spawn a heartbeat thread which sends ticks down the reply channel every second.
/// This lets us implement timeouts without the not yet stable `recv_timeout`.
fn heartbeat_thread(replies: Sender<Reply>) -> thread::JoinHandle<()> {
    thread::Builder::new()
        .name("heartbeat".to_string())
        .spawn(move || {
            file_per_thread_logger::initialize(LOG_FILENAME_PREFIX);
            while replies.send(Reply::Tick).is_ok() {
                thread::sleep(Duration::from_secs(1));
            }
        })
        .unwrap()
}

/// Spawn a worker thread running tests.
fn worker_thread(