tokio-1.52.3
agentscope-ai/QwenPawtokio-1.52.3May 8, 2026by Darksonn
AI Summary
This release addresses several critical synchronization issues within Tokio's multi-producer single-consumer (mpsc) channels and the RwLock implementation to prevent underflows and ensure correct behavior when channels are closed.
Key Highlights
- Fixed mpsc channel length underflow
- Fixed receiver notification in OwnedPermit::release()
- Fixed RwLock validation requiring non-zero max_readers
- Fixed try_recv() to return Empty when channels are closed
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