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tokio-1.52.3

Wilfred/difftastictokio-1.52.3May 8, 2026by Darksonn

AI Summary

A maintenance release addressing critical bugs in the message passing (mpsc) channel and read-write lock (RwLock) synchronization primitives.

Key Highlights

  • Fixed underflow in mpsc channel `len()`
  • Fixed notification of receivers in mpsc `OwnedPermit::release()`
  • Fixed `RwLock` max_readers requirement
  • Fixed `try_recv()` behavior when channel closes with outstanding permits

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