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tokio-1.47.5

CL-lau/SQL-GPTtokio-1.47.5May 7, 2026by Darksonn

AI Summary

A patch release fixing synchronization bugs in channels and locks (identical to v1.51.3).

Key Highlights

  • Fixed underflow in mpsc channel `len()` method.
  • Fixed notification logic in mpsc `OwnedPermit::release()`.
  • Fixed `RwLock` max_readers requirement validation.
  • Fixed `try_recv()` return value when channel is closed.

New Features

  • Fixed mpsc channel underflow.
  • Fixed mpsc notification logic.
  • Fixed RwLock max_readers validation.
  • Fixed try_recv behavior on closed channels.

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