[][src]Function tokio::executor::spawn

pub fn spawn<F>(f: F) -> Spawn where
    F: Future<Item = (), Error = ()> + 'static + Send

Spawns a future on the default executor.

In order for a future to do work, it must be spawned on an executor. The spawn function is the easiest way to do this. It spawns a future on the default executor for the current execution context (tracked using a thread-local variable).

The default executor is usually a thread pool.


In this example, a server is started and spawn is used to start a new task that processes each received connection.

use tokio::net::TcpListener;

let listener = TcpListener::bind(&addr).unwrap();

let server = listener.incoming()
    .map_err(|e| println!("error = {:?}", e))
    .for_each(|socket| {



This function will panic if the default executor is not set or if spawning onto the default executor returns an error. To avoid the panic, use DefaultExecutor.