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tokio-1.49.0

tokio-rs/tokiotokio-1.49.0Jan 3, 2026by Darksonn

AI Summary

This release stabilizes runtime::id::Id and LocalSet::id(), adds IPv6 TCLASS option support, and includes various bug fixes for macros, sync, and runtime components. It also deprecates set_linger methods on TcpStream and TcpSocket.

Key Highlights

  • Stabilized runtime::id::Id for runtime identification
  • Stabilized LocalSet::id() method
  • Added TCLASS option support for IPv6
  • Deprecated set_linger on TcpStream and TcpSocket
  • Fixed hygiene issue in join! and try_join! macros

New Features

  • net: add support for TCLASS option on IPv6
  • runtime: stabilize runtime::id::Id
  • task: implement Extend for JoinSet
  • task: stabilize LocalSet::id()

Full Release Notes

# 1.49.0 (January 3rd, 2026)

### Added

* net: add support for `TCLASS` option on IPv6 ([#7781])
* runtime: stabilize `runtime::id::Id` ([#7125])
* task: implement `Extend` for `JoinSet` ([#7195])
* task: stabilize the `LocalSet::id()` ([#7776])

### Changed

* net: deprecate `{TcpStream,TcpSocket}::set_linger` ([#7752])

### Fixed

* macros: fix the hygiene issue of `join!` and `try_join!` ([#7766])
* runtime: revert "replace manual vtable definitions with Wake" ([#7699])
* sync: return `TryRecvError::Disconnected` from `Receiver::try_recv` after `Receiver::close` ([#7686])
* task: remove unnecessary trait bounds on the `Debug` implementation ([#7720])

### Unstable

* fs: handle `EINTR` in `fs::write` for io-uring ([#7786])
* fs: support io-uring with `tokio::fs::read` ([#7696])
* runtime: disable io-uring on `EPERM` ([#7724])
* time: add alternative timer for better multicore scalability ([#7467])

### Documented

* docs: fix a typos in `bounded.rs` and `park.rs` ([#7817])
* io: add `SyncIoBridge` cross-references to `copy` and `copy_buf` ([#7798])
* io: doc that `AsyncWrite` does not inherit from `std::io::Write` ([#7705])
* metrics: clarify that `num_alive_tasks` is not strongly consistent ([#7614])
* net: clarify the cancellation safety of the `TcpStream::peek` ([#7305])
* net: clarify the drop behavior of `unix::OwnedWriteHalf` ([#7742])
* net: clarify the platform-dependent backlog in `TcpSocket` docs ([#7738])
* runtime: mention `LocalRuntime` in `new_current_thread` docs ([#7820])
* sync: add missing period to `mpsc::Sender::try_send` docs ([#7721])
* sync: clarify the cancellation safety of `oneshot::Receiver` ([#7780])
* sync: improve the docs for the `errors` of mpsc ([#7722])
* task: add example for `spawn_local` usage on local runtime ([#7689])

[#7125]: https://github.com/tokio-rs/tokio/pull/7125
[#7195]: https://github.com/tokio-rs/tokio/pull/7195
[#7305]: https://github.com/tokio-rs/tokio/pull/7305
[#7467]: https://github.com/tokio-rs/tokio/pull/7467
[#7614]: https://github.com/tokio-rs/tokio/pull/7614
[#7686]: https://github.com/tokio-rs/tokio/pull/7686
[#7689]: https://github.com/tokio-rs/tokio/pull/7689
[#7696]: https://github.com/tokio-rs/tokio/pull/7696
[#7699]: https://github.com/tokio-rs/tokio/pull/7699
[#7705]: https://github.com/tokio-rs/tokio/pull/7705
[#7720]: https://github.com/tokio-rs/tokio/pull/7720
[#7721]: https://github.com/tokio-rs/tokio/pull/7721
[#7722]: https://github.com/tokio-rs/tokio/pull/7722
[#7724]: https://github.com/tokio-rs/tokio/pull/7724
[#7738]: https://github.com/tokio-rs/tokio/pull/7738
[#7742]: https://github.com/tokio-rs/tokio/pull/7742
[#7752]: https://github.com/tokio-rs/tokio/pull/7752
[#7766]: https://github.com/tokio-rs/tokio/pull/7766
[#7776]: https://github.com/tokio-rs/tokio/pull/7776
[#7780]: https://github.com/tokio-rs/tokio/pull/7780
[#7781]: https://github.com/tokio-rs/tokio/pull/7781
[#7786]: https://github.com/tokio-rs/tokio/pull/7786
[#7798]: https://github.com/tokio-rs/tokio/pull/7798
[#7817]: https://github.com/tokio-rs/tokio/pull/7817
[#7820]: https://github.com/tokio-rs/tokio/pull/7820