servo/components/util/task.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use std::borrow::ToOwned;
use task_state;
use std::thread;
use std::sync::mpsc::Sender;
use std::thread::Builder;

pub fn spawn_named<F>(name: String, f: F)
    where F: FnOnce() + Send
{
    let builder = thread::Builder::new().name(name);
    builder.spawn(move || {
        f()
    });
}

/// Arrange to send a particular message to a channel if the task fails.
pub fn spawn_named_with_send_on_failure<F, T>(name: &'static str,
                                              state: task_state::TaskState,
                                              f: F,
                                              msg: T,
                                              dest: Sender<T>)
    where F: FnOnce() + Send,
          T: Send
{
    let future_handle = thread::Builder::new().name(name.to_owned()).scoped(move || {
        task_state::initialize(state);
        f()
    });

    let watcher_name = format!("{}Watcher", name);
    Builder::new().name(watcher_name).spawn(move || {
        match future_handle.join() {
            Ok(()) => (),
            Err(..) => {
                debug!("{} failed, notifying constellation", name);
                dest.send(msg).unwrap();
            }
        }
    });
}

#[test]
fn spawn_named_test() {
    spawn_named("Test".to_owned(), move || {
        debug!("I can run!");
    });
}