# 1.17.0 (February 16, 2022) This release updates the minimum supported Rust version (MSRV) to 1.49, the `mio` dependency to v0.8, and the (optional) `parking_lot` dependency to v0.12. Additionally, it contains several bug fixes, as well as internal refactoring and performance improvements. ### Fixed - time: prevent panicking in `sleep` with large durations ([#4495]) - time: eliminate potential panics in `Instant` arithmetic on platforms where `Instant::now` is not monotonic ([#4461]) - io: fix `DuplexStream` not participating in cooperative yielding ([#4478]) - rt: fix potential double panic when dropping a `JoinHandle` ([#4430]) ### Changed - update minimum supported Rust version to 1.49 ([#4457]) - update `parking_lot` dependency to v0.12.0 ([#4459]) - update `mio` dependency to v0.8 ([#4449]) - rt: remove an unnecessary lock in the blocking pool ([#4436]) - rt: remove an unnecessary enum in the basic scheduler ([#4462]) - time: use bit manipulation instead of modulo to improve performance ([#4480]) - net: use `std::future::Ready` instead of our own `Ready` future ([#4271]) - replace deprecated `atomic::spin_loop_hint` with `hint::spin_loop` ([#4491]) - fix miri failures in intrusive linked lists ([#4397]) ### Documented - io: add an example for `tokio::process::ChildStdin` ([#4479]) ### Unstable The following changes only apply when building with `--cfg tokio_unstable`: - task: fix missing location information in `tracing` spans generated by `spawn_local` ([#4483]) - task: add `JoinSet` for managing sets of tasks ([#4335]) - metrics: fix compilation error on MIPS ([#4475]) - metrics: fix compilation error on arm32v7 ([#4453]) [#4495]: https://github.com/tokio-rs/tokio/pull/4495 [#4461]: https://github.com/tokio-rs/tokio/pull/4461 [#4478]: https://github.com/tokio-rs/tokio/pull/4478 [#4430]: https://github.com/tokio-rs/tokio/pull/4430 [#4457]: https://github.com/tokio-rs/tokio/pull/4457 [#4459]: https://github.com/tokio-rs/tokio/pull/4459 [#4449]: https://github.com/tokio-rs/tokio/pull/4449 [#4462]: https://github.com/tokio-rs/tokio/pull/4462 [#4436]: https://github.com/tokio-rs/tokio/pull/4436 [#4480]: https://github.com/tokio-rs/tokio/pull/4480 [#4271]: https://github.com/tokio-rs/tokio/pull/4271 [#4491]: https://github.com/tokio-rs/tokio/pull/4491 [#4397]: https://github.com/tokio-rs/tokio/pull/4397 [#4479]: https://github.com/tokio-rs/tokio/pull/4479 [#4483]: https://github.com/tokio-rs/tokio/pull/4483 [#4335]: https://github.com/tokio-rs/tokio/pull/4335 [#4475]: https://github.com/tokio-rs/tokio/pull/4475 [#4453]: https://github.com/tokio-rs/tokio/pull/4453