Expand description
Portable interface to epoll, kqueue, event ports, and wepoll.
Supported platforms:
- epoll: Linux, Android
- kqueue: macOS, iOS, FreeBSD, NetBSD, OpenBSD, DragonFly BSD
- event ports: illumos, Solaris
- poll: VxWorks, Fuchsia, other Unix systems
- wepoll: Windows
Polling is done in oneshot mode, which means interest in I/O events needs to be re-enabled after an event is delivered if we’re interested in the next event of the same kind.
Only one thread can be waiting for I/O events at a time.
Examples
use polling::{Event, Poller};
use std::net::TcpListener;
// Create a TCP listener.
let socket = TcpListener::bind("127.0.0.1:8000")?;
socket.set_nonblocking(true)?;
let key = 7; // Arbitrary key identifying the socket.
// Create a poller and register interest in readability on the socket.
let poller = Poller::new()?;
poller.add(&socket, Event::readable(key))?;
// The event loop.
let mut events = Vec::new();
loop {
// Wait for at least one I/O event.
events.clear();
poller.wait(&mut events, None)?;
for ev in &events {
if ev.key == key {
// Perform a non-blocking accept operation.
socket.accept()?;
// Set interest in the next readability event.
poller.modify(&socket, Event::readable(key))?;
}
}
}Structs
Indicates that a file descriptor or socket can read or write without blocking.
Waits for I/O events.