74 lines
2.5 KiB
Markdown
74 lines
2.5 KiB
Markdown
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# polling
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[](
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https://github.com/smol-rs/polling/actions)
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[](
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https://github.com/smol-rs/polling)
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[](
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https://crates.io/crates/polling)
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[](
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https://docs.rs/polling)
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Portable interface to epoll, kqueue, event ports, and IOCP.
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Supported platforms:
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- [epoll](https://en.wikipedia.org/wiki/Epoll): Linux, Android
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- [kqueue](https://en.wikipedia.org/wiki/Kqueue): macOS, iOS, tvOS, watchOS, FreeBSD, NetBSD, OpenBSD,
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DragonFly BSD
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- [event ports](https://illumos.org/man/port_create): illumos, Solaris
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- [poll](https://en.wikipedia.org/wiki/Poll_(Unix)): VxWorks, Fuchsia, other Unix systems
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- [IOCP](https://learn.microsoft.com/en-us/windows/win32/fileio/i-o-completion-ports): Windows, Wine (version 7.13+)
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Polling is done in oneshot mode, which means interest in I/O events needs to be reset after
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an event is delivered if we're interested in the next event of the same kind.
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Only one thread can be waiting for I/O events at a time.
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## Examples
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```rust,no_run
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use polling::{Event, Poller};
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use std::net::TcpListener;
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// Create a TCP listener.
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let socket = TcpListener::bind("127.0.0.1:8000")?;
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socket.set_nonblocking(true)?;
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let key = 7; // Arbitrary key identifying the socket.
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// Create a poller and register interest in readability on the socket.
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let poller = Poller::new()?;
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poller.add(&socket, Event::readable(key))?;
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// The event loop.
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let mut events = Vec::new();
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loop {
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// Wait for at least one I/O event.
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events.clear();
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poller.wait(&mut events, None)?;
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for ev in &events {
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if ev.key == key {
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// Perform a non-blocking accept operation.
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socket.accept()?;
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// Set interest in the next readability event.
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poller.modify(&socket, Event::readable(key))?;
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}
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}
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}
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```
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## License
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Licensed under either of
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* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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#### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
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dual licensed as above, without any additional terms or conditions.
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