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tokio: prepare to release v1.18.0 #4641

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tokio: prepare to release v1.18.0 #4641

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tokio: prepare to release v1.18.0
hawkw Apr 27, 2022
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rm nix mention
hawkw Apr 27, 2022
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# 1.18.0 (April 27, 2022)

This release adds a number of new APIs in `tokio::net`, `tokio::signal`, and
`tokio::sync`. In addition, it adds new unstable APIs to `tokio::task` (`Id`s
for uniquely identifying a task, and `AbortHandle` for remotely cancelling a
task), as well as a number of bugfixes.

### Fixed

- blocking: add missing `#[track_caller]` for `spawn_blocking` ([#4616])
- macros: fix `select` macro to process 64 branches ([#4519])
- net: fix `try_io` methods not calling Mio's `try_io` internally ([#4582])
- runtime: recover when OS fails to spawn a new thread ([#4485])

### Added

- macros: support setting a custom crate name for `#[tokio::main]` and
`#[tokio::test]` ([#4613])
- net: add `UdpSocket::peer_addr` ([#4611])
- net: add `try_read_buf` method for named pipes ([#4626])
- signal: add `SignalKind` `Hash`/`Eq` impls and `c_int` conversion ([#4540])
- signal: add support for signals up to `SIGRTMAX` ([#4555])
- sync: add `watch::Sender::send_modify` method ([#4310])
- sync: add `broadcast::Receiver::len` method ([#4542])
- sync: add `watch::Receiver::same_channel` method ([#4581])
- sync: implement `Clone` for `RecvError` types ([#4560])

### Changed

- update `nix` to 0.24, limit features ([#4631])
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This is a dev-dependency, so it shouldn't be listed in the changelog.

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ah, will remove it, thanks!

- update `mio` to 0.8.1 ([#4582])
- macros: rename `tokio::select!`'s internal `util` module ([#4543])
- runtime: use `Vec::with_capacity` when building runtime ([#4553])

### Documented

- improve docs for `tokio_unstable` ([#4524])
- runtime: include more documentation for thread_pool/worker ([#4511])
- runtime: update `Handle::current`'s docs to mention `EnterGuard` ([#4567])
- time: clarify platform specific timer resolution ([#4474])
- signal: document that `Signal::recv` is cancel-safe ([#4634])
- sync: `UnboundedReceiver` close docs ([#4548])

### Unstable

The following changes only apply when building with `--cfg tokio_unstable`:

- task: add `task::Id` type ([#4630])
- task: add `AbortHandle` type for cancelling tasks in a `JoinSet` ([#4530],
[#4640])
- task: fix missing `doc(cfg(...))` attributes for `JoinSet` ([#4531])
- task: fix broken link in `AbortHandle` RustDoc ([#4545])
- metrics: add initial IO driver metrics ([#4507])


[#4616]: https://github.com/tokio-rs/tokio/pull/4616
[#4519]: https://github.com/tokio-rs/tokio/pull/4519
[#4582]: https://github.com/tokio-rs/tokio/pull/4582
[#4485]: https://github.com/tokio-rs/tokio/pull/4485
[#4613]: https://github.com/tokio-rs/tokio/pull/4613
[#4611]: https://github.com/tokio-rs/tokio/pull/4611
[#4626]: https://github.com/tokio-rs/tokio/pull/4626
[#4540]: https://github.com/tokio-rs/tokio/pull/4540
[#4555]: https://github.com/tokio-rs/tokio/pull/4555
[#4310]: https://github.com/tokio-rs/tokio/pull/4310
[#4542]: https://github.com/tokio-rs/tokio/pull/4542
[#4581]: https://github.com/tokio-rs/tokio/pull/4581
[#4560]: https://github.com/tokio-rs/tokio/pull/4560
[#4631]: https://github.com/tokio-rs/tokio/pull/4631
[#4582]: https://github.com/tokio-rs/tokio/pull/4582
[#4543]: https://github.com/tokio-rs/tokio/pull/4543
[#4553]: https://github.com/tokio-rs/tokio/pull/4553
[#4524]: https://github.com/tokio-rs/tokio/pull/4524
[#4511]: https://github.com/tokio-rs/tokio/pull/4511
[#4567]: https://github.com/tokio-rs/tokio/pull/4567
[#4474]: https://github.com/tokio-rs/tokio/pull/4474
[#4634]: https://github.com/tokio-rs/tokio/pull/4634
[#4548]: https://github.com/tokio-rs/tokio/pull/4548
[#4630]: https://github.com/tokio-rs/tokio/pull/4630
[#4530]: https://github.com/tokio-rs/tokio/pull/4530
[#4640]: https://github.com/tokio-rs/tokio/pull/4640
[#4531]: https://github.com/tokio-rs/tokio/pull/4531
[#4545]: https://github.com/tokio-rs/tokio/pull/4545
[#4507]: https://github.com/tokio-rs/tokio/pull/4507

# 1.17.0 (February 16, 2022)

This release updates the minimum supported Rust version (MSRV) to 1.49, the
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