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tokio-1.52.3

Xiaojiu-z/EasyControltokio-1.52.3May 8, 2026by Darksonn

AI Summary

Bug fix release for the Tokio async runtime addressing channel underflow, lock behavior, and receiver notification issues.

Key Highlights

  • Fixed underflow in mpsc channel len()
  • Fixed receiver notification in OwnedPermit::release()
  • Fixed RwLock to require max_readers != 0
  • Fixed try_recv() to return Empty when channel is closed

New Features

  • Channel length underflow fix
  • Receiver notification fix
  • RwLock max_readers requirement fix
  • Closed channel try_recv fix

Full Release Notes

# 1.52.3 (May 8th, 2026)

### Fixed

* sync: fix underflow in mpsc channel `len()` ([#8062])
* sync: notify receivers in mpsc `OwnedPermit::release()` method ([#8075])
* sync: require that an `RwLock` has `max_readers != 0` ([#8076])
* sync: return `Empty` from `try_recv()` when mpsc is closed with outstanding permits ([#8074])

[#8062]: https://github.com/tokio-rs/tokio/pull/8062
[#8074]: https://github.com/tokio-rs/tokio/pull/8074
[#8075]: https://github.com/tokio-rs/tokio/pull/8075
[#8076]: https://github.com/tokio-rs/tokio/pull/8076