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tokio-1.47.5

Kedreamix/Linly-Talkertokio-1.47.5May 7, 2026by Darksonn

AI Summary

Patch release addressing the same synchronization issues found in v1.52.3 and v1.51.3, focusing on mpsc channel and RwLock stability.

Key Highlights

  • Fixed underflow in `mpsc` channel `len()` method
  • Fixed receiver notifications in `OwnedPermit::release()`
  • Fixed `RwLock` to require non-zero `max_readers`
  • Fixed `try_recv()` to return `Empty` when channel is closed with permits

New Features

  • Channel synchronization safety improvements
  • RwLock max_readers validation
  • Closed channel handling fixes

Full Release Notes

# 1.47.5 (May 7th, 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