tokio-1.47.5

morphik-org/morphik-coretokio-1.47.5May 7, 2026by Darksonn

AI Summary

This release applies the same critical synchronization fixes for mpsc channels and read-write locks as version 1.51.3.

Key Highlights

Fixes underflow in mpsc channel `len()`
Ensures receivers are notified when permits are released
Enforces non-zero `max_readers` for `RwLock` to prevent invalid states
Improves `try_recv()` to return `Empty` when channels close with outstanding permits

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