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tokio-1.50.0

tokio-rs/tokiotokio-1.50.0Mar 3, 2026by Darksonn

AI Summary

This release adds TCP stream zero linger configuration, runtime shutdown error detection, and various runtime optimizations like vectored writes and `memchr` hints. It also introduces a panic behavior when `event_interval` is set to zero.

Key Highlights

  • Added `TcpStream::set_zero_linger`
  • Added `is_rt_shutdown_err`
  • Implemented vectored writes for `write_buf`
  • Runtime panic when `event_interval` is set to 0
  • Cleanup of `AsyncFd` registration list

Breaking Changes

  • Runtime now panics when `event_interval` is set to 0

New Features

  • `TcpStream::set_zero_linger`
  • `is_rt_shutdown_err`
  • Vectored writes for `write_buf`
  • `memchr` optimizer hint
  • Cleanup of `AsyncFd` registration

Full Release Notes

# 1.50.0 (Mar 3rd, 2026)

### Added

- net: add `TcpStream::set_zero_linger` ([#7837])
- rt: add `is_rt_shutdown_err` ([#7771])

### Changed

- io: add optimizer hint that `memchr` returns in-bounds pointer ([#7792])
- io: implement vectored writes for `write_buf` ([#7871])
- runtime: panic when `event_interval` is set to 0 ([#7838])
- runtime: shorten default thread name to fit in Linux limit ([#7880])
- signal: remember the result of `SetConsoleCtrlHandler` ([#7833])
- signal: specialize windows `Registry` ([#7885])

### Fixed

- io: always cleanup `AsyncFd` registration list on deregister ([#7773])
- macros: remove (most) local `use` declarations in `tokio::select!` ([#7929])
- net: fix `GET_BUF_SIZE` constant for `target_os = "android"` ([#7889])
- runtime: avoid redundant unpark in current_thread scheduler ([#7834])
- runtime: don't park in `current_thread` if `before_park` defers waker ([#7835])
- io: fix write readiness on ESP32 on short writes ([#7872])
- runtime: wake deferred tasks before entering `block_in_place` ([#7879])
- sync: drop rx waker when oneshot receiver is dropped ([#7886])
- runtime: fix double increment of `num_idle_threads` on shutdown ([#7910], [#7918], [#7922])

### Unstable

- fs: check for io-uring opcode support ([#7815])
- runtime: avoid lock acquisition after uring init ([#7850])

### Documented

- docs: update outdated unstable features section ([#7839])
- io: clarify the behavior of `AsyncWriteExt::shutdown()` ([#7908])
- io: explain how to flush stdout/stderr ([#7904])
- io: fix incorrect and confusing `AsyncWrite` documentation ([#7875])
- rt: clarify the documentation of `Runtime::spawn` ([#7803])
- rt: fix missing quotation in docs ([#7925])
- runtime: correct the default thread name in docs ([#7896])
- runtime: fix `event_interval` doc ([#7932])
- sync: clarify RwLock fairness documentation ([#7919])
- sync: clarify that `recv` returns `None` once closed and no more messages ([#7920])
- task: clarify when to use `spawn_blocking` vs dedicated threads ([#7923])
- task: doc that task drops before `JoinHandle` completion ([#7825])
- signal: guarantee that listeners never return `None` ([#7869])
- task: fix task module feature flags in docs ([#7891])
- task: fix two typos ([#7913])
- task: improve the docs of `Builder::spawn_local` ([#7828])
- time: add docs about auto-advance and when to use sleep ([#7858])
- util: fix typo in docs ([#7926])

[#7771]: https://github.com/tokio-rs/tokio/pull/7771
[#7773]: https://github.com/tokio-rs/tokio/pull/7773
[#7792]: https://github.com/tokio-rs/tokio/pull/7792
[#7803]: https://github.com/tokio-rs/tokio/pull/7803
[#7815]: https://github.com/tokio-rs/tokio/pull/7815
[#7825]: https://github.com/tokio-rs/tokio/pull/7825
[#7828]: https://github.com/tokio-rs/tokio/pull/7828
[#7833]: https://github.com/tokio-rs/tokio/pull/7833
[#7834]: https://github.com/tokio-rs/tokio/pull/7834
[#7835]: https://github.com/tokio-rs/tokio/pull/7835
[#7837]: https://github.com/tokio-rs/tokio/pull/7837
[#7838]: https://github.com/tokio-rs/tokio/pull/7838
[#7839]: https://github.com/tokio-rs/tokio/pull/7839
[#7850]: https://github.com/tokio-rs/tokio/pull/7850
[#7858]: https://github.com/tokio-rs/tokio/pull/7858
[#7869]: https://github.com/tokio-rs/tokio/pull/7869
[#7871]: https://github.com/tokio-rs/tokio/pull/7871
[#7872]: https://github.com/tokio-rs/tokio/pull/7872
[#7875]: https://github.com/tokio-rs/tokio/pull/7875
[#7879]: https://github.com/tokio-rs/tokio/pull/7879
[#7880]: https://github.com/tokio-rs/tokio/pull/7880
[#7885]: https://github.com/tokio-rs/tokio/pull/7885
[#7886]: https://github.com/tokio-rs/tokio/pull/7886
[#7889]: https://github.com/tokio-rs/tokio/pull/7889
[#7891]: https://github.com/tokio-rs/tokio/pull/7891
[#7896]: https://github.com/tokio-rs/tokio/pull/7896
[#7904]: https://github.com/tokio-rs/tokio/pull/7904
[#7908]: https://github.com/tokio-rs/tokio/pull/7908
[#7910]: https://github.com/tokio-rs/tokio/pull/7910
[#7913]: https://github.com/tokio-rs/tokio/pull/7913
[#7918]: https://github.com/tokio-rs/tokio/pull/7918
[#7919]: https://github.com/tokio-rs/tokio/pull/7919
[#7920]: https://github.com/tokio-rs/tokio/pull/7920
[#7922]: https://github.com/tokio-rs/tokio/pull/7922
[#7923]: https://github.com/tokio-rs/tokio/pull/7923
[#7925]: https://github.com/tokio-rs/tokio/pull/7925
[#7926]: https://github.com/tokio-rs/tokio/pull/7926
[#7929]: https://github.com/tokio-rs/tokio/pull/7929
[#7932]: https://github.com/tokio-rs/tokio/pull/7932