Struct CtrlShutdown

pub struct CtrlShutdown { /* private fields */ }

Available on Windows and crate feature signal only.

Represents a listener which receives “ctrl-shutdown” notifications sent to the process via SetConsoleCtrlHandler.

A notification to this process notifies all listeners listening for this event. Moreover, the notifications are coalesced if they aren’t processed quickly enough. This means that if two notifications are received back-to-back, then the listener may only receive one item about the two notifications.

Implementations

impl CtrlShutdown

pub async fn recv(&mut self) -> Option<()>

Receives the next signal notification event.

None is returned if no more events can be received by this listener.

Examples

use tokio::signal::windows::ctrl_shutdown;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // A listener of CTRL-SHUTDOWN events.
    let mut signal = ctrl_shutdown()?;

    // Print whenever a CTRL-SHUTDOWN event is received.
    signal.recv().await;
    println!("got CTRL-SHUTDOWN. Cleaning up before exiting");

    Ok(())
}

pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>>

Polls to receive the next signal notification event, outside of an async context.

None is returned if no more events can be received by this listener.

Examples

Polling from a manually implemented future

use std::pin::Pin;
use std::future::Future;
use std::task::{Context, Poll};
use tokio::signal::windows::CtrlShutdown;

struct MyFuture {
    ctrl_shutdown: CtrlShutdown,
}

impl Future for MyFuture {
    type Output = Option<()>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        println!("polling MyFuture");
        self.ctrl_shutdown.poll_recv(cx)
    }
}

Trait Implementations

impl Debug for CtrlShutdown

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes