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sync: document drop behavior for channels #5497

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merged 2 commits into from
Feb 23, 2023
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@hds hds commented Feb 22, 2023

Motivation

Some users mentioned that the behavior of a channel when the receivers
and/or senders are dropped isn't explicitly documented.

Solution

This change adds wording to the documentation for each channel in the
sync module, explaining under which conditions messages in a channel are
dropped with respect to dropping the senders and the receivers.

Refs: #5490

Some users mentioned that the behavior of a channel when the receivers
and/or senders are dropped isn't explicitly documented.

This change adds wording to the documentation for each channel in the
sync module, explaining under which conditions messages in a channel are
dropped with respect to dropping the senders and the receivers.

Refs: #5490
@github-actions github-actions bot added the R-loom Run loom tests on this PR label Feb 22, 2023
Co-authored-by: Tymoteusz Wiśniewski <tymo@tymo.xyz>
@satakuma satakuma added T-docs Topic: documentation A-tokio Area: The main tokio crate M-sync Module: tokio/sync labels Feb 23, 2023
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Looks good!

@hds hds merged commit c894069 into master Feb 23, 2023
@hds hds deleted the hds/docs-channel-dropping branch February 23, 2023 10:04
amab8901 pushed a commit to amab8901/tokio that referenced this pull request Feb 27, 2023
Some users mentioned that the behavior of a channel when the receivers
and/or senders are dropped isn't explicitly documented.

This change adds wording to the documentation for each channel in the
sync module, explaining under which conditions messages in a channel are
dropped with respect to dropping the senders and the receivers.

Refs: tokio-rs#5490
Noah-Kennedy added a commit that referenced this pull request Mar 1, 2023
# 1.26.0 (March 1st, 2023)

### Fixed

- sync: don't leak tracing spans in mutex guards ([#5469])
- sync: drop wakers after unlocking the mutex in Notify ([#5471])
- sync: drop wakers outside lock in semaphore ([#5475])
- macros: fix empty `join!` and `try_join!` ([#5504])

### Added

- fs: add `fs::try_exists` ([#4299])
- net: add types for named unix pipes ([#5351])
- sync: add `MappedOwnedMutexGuard` ([#5474])

### Documented

- task: clarify what happens to spawned work during runtime shutdown ([#5394])
- task: clarify `process::Command` docs (#5406) ([#5413])
- sync: add doc aliases for `blocking_*` methods ([#5448])
- task: fix wording with 'unsend' ([#5452])
- signal: updated Documentation for Signals ([#5459])
- sync: fix docs for Send/Sync bounds in broadcast ([#5480])
- io: improve AsyncFd example ([#5481])
- tokio: document supported platforms ([#5483])
- runtime: document the nature of the main future ([#5494])
- sync: document drop behavior for channels ([#5497])
- time: document immediate completion guarantee for timeouts ([#5509])
- runtime: remove extra period in docs ([#5511])

### Changed

- net: use Message Read Mode for named pipes ([#5350])
- chore: update windows-sys to 0.45 ([#5386])
- sync: mark lock guards with `#[clippy::has_significant_drop]` ([#5422])
- sync: reduce contention in watch channel ([#5464])
- time: remove cache padding in timer entries ([#5468])
- time: Improve `Instant::now()` perf with test-util ([#5513])

### Internal Changes
- tests: port proptest fuzz harnesses to use cargo-fuzz ([#5392])
- time: don't store deadline twice in sleep entries ([#5410])
- rt: remove Arc from Clock ([#5434])
- sync: make `notify_waiters` calls atomic ([#5458])
- net: refactor named pipe builders to not use bitfields ([#5477])
- io: use `poll_fn` in `copy_bidirectional` ([#5486])
- fs: add more tests for filesystem functionality ([#5493])
- net: fix test compilation failure ([#5506])
- io: ignore SplitByUtf8BoundaryIfWindows test on miri ([#5507])

### Unstable

- metrics: add a new metric for budget exhaustion yields ([#5517])

[#4299]: #4299
[#5350]: #5350
[#5351]: #5351
[#5386]: #5386
[#5392]: #5392
[#5394]: #5394
[#5410]: #5410
[#5413]: #5413
[#5422]: #5422
[#5434]: #5434
[#5448]: #5448
[#5452]: #5452
[#5458]: #5458
[#5459]: #5459
[#5464]: #5464
[#5468]: #5468
[#5469]: #5469
[#5471]: #5471
[#5474]: #5474
[#5475]: #5475
[#5477]: #5477
[#5480]: #5480
[#5481]: #5481
[#5483]: #5483
[#5486]: #5486
[#5493]: #5493
[#5494]: #5494
[#5497]: #5497
[#5504]: #5504
[#5506]: #5506
[#5507]: #5507
[#5509]: #5509
[#5511]: #5511
[#5513]: #5513
[#5517]: #5517
Noah-Kennedy added a commit that referenced this pull request Mar 1, 2023
# 1.26.0 (March 1st, 2023)

### Fixed

- macros: fix empty `join!` and `try_join!` ([#5504])
- sync: don't leak tracing spans in mutex guards ([#5469])
- sync: drop wakers after unlocking the mutex in Notify ([#5471])
- sync: drop wakers outside lock in semaphore ([#5475])

### Added

- fs: add `fs::try_exists` ([#4299])
- net: add types for named unix pipes ([#5351])
- sync: add `MappedOwnedMutexGuard` ([#5474])

### Changed

- chore: update windows-sys to 0.45 ([#5386])
- net: use Message Read Mode for named pipes ([#5350])
- sync: mark lock guards with `#[clippy::has_significant_drop]` ([#5422])
- sync: reduce contention in watch channel ([#5464])
- time: remove cache padding in timer entries ([#5468])
- time: Improve `Instant::now()` perf with test-util ([#5513])

### Internal Changes

- io: use `poll_fn` in `copy_bidirectional` ([#5486])
- net: refactor named pipe builders to not use bitfields ([#5477])
- rt: remove Arc from Clock ([#5434])
- sync: make `notify_waiters` calls atomic ([#5458])
- time: don't store deadline twice in sleep entries ([#5410])

### Unstable

- metrics: add a new metric for budget exhaustion yields ([#5517])

### Documented

- io: improve AsyncFd example ([#5481])
- runtime: document the nature of the main future ([#5494])
- runtime: remove extra period in docs ([#5511])
- signal: updated Documentation for Signals ([#5459])
- sync: add doc aliases for `blocking_*` methods ([#5448])
- sync: fix docs for Send/Sync bounds in broadcast ([#5480])
- sync: document drop behavior for channels ([#5497])
- task: clarify what happens to spawned work during runtime shutdown ([#5394])
- task: clarify `process::Command` docs ([#5413])
- task: fix wording with 'unsend' ([#5452])
- time: document immediate completion guarantee for timeouts ([#5509])
- tokio: document supported platforms ([#5483])

[#4299]: #4299
[#5350]: #5350
[#5351]: #5351
[#5386]: #5386
[#5394]: #5394
[#5410]: #5410
[#5413]: #5413
[#5422]: #5422
[#5434]: #5434
[#5448]: #5448
[#5452]: #5452
[#5458]: #5458
[#5459]: #5459
[#5464]: #5464
[#5468]: #5468
[#5469]: #5469
[#5471]: #5471
[#5474]: #5474
[#5475]: #5475
[#5477]: #5477
[#5480]: #5480
[#5481]: #5481
[#5483]: #5483
[#5486]: #5486
[#5494]: #5494
[#5497]: #5497
[#5504]: #5504
[#5509]: #5509
[#5511]: #5511
[#5513]: #5513
[#5517]: #5517
Noah-Kennedy added a commit that referenced this pull request Mar 1, 2023
# 1.26.0 (March 1st, 2023)

### Fixed

- macros: fix empty `join!` and `try_join!` ([#5504])
- sync: don't leak tracing spans in mutex guards ([#5469])
- sync: drop wakers after unlocking the mutex in Notify ([#5471])
- sync: drop wakers outside lock in semaphore ([#5475])

### Added

- fs: add `fs::try_exists` ([#4299])
- net: add types for named unix pipes ([#5351])
- sync: add `MappedOwnedMutexGuard` ([#5474])

### Changed

- chore: update windows-sys to 0.45 ([#5386])
- net: use Message Read Mode for named pipes ([#5350])
- sync: mark lock guards with `#[clippy::has_significant_drop]` ([#5422])
- sync: reduce contention in watch channel ([#5464])
- time: remove cache padding in timer entries ([#5468])
- time: Improve `Instant::now()` perf with test-util ([#5513])

### Internal Changes

- io: use `poll_fn` in `copy_bidirectional` ([#5486])
- net: refactor named pipe builders to not use bitfields ([#5477])
- rt: remove Arc from Clock ([#5434])
- sync: make `notify_waiters` calls atomic ([#5458])
- time: don't store deadline twice in sleep entries ([#5410])

### Unstable

- metrics: add a new metric for budget exhaustion yields ([#5517])

### Documented

- io: improve AsyncFd example ([#5481])
- runtime: document the nature of the main future ([#5494])
- runtime: remove extra period in docs ([#5511])
- signal: updated Documentation for Signals ([#5459])
- sync: add doc aliases for `blocking_*` methods ([#5448])
- sync: fix docs for Send/Sync bounds in broadcast ([#5480])
- sync: document drop behavior for channels ([#5497])
- task: clarify what happens to spawned work during runtime shutdown ([#5394])
- task: clarify `process::Command` docs ([#5413])
- task: fix wording with 'unsend' ([#5452])
- time: document immediate completion guarantee for timeouts ([#5509])
- tokio: document supported platforms ([#5483])

[#4299]: #4299
[#5350]: #5350
[#5351]: #5351
[#5386]: #5386
[#5394]: #5394
[#5410]: #5410
[#5413]: #5413
[#5422]: #5422
[#5434]: #5434
[#5448]: #5448
[#5452]: #5452
[#5458]: #5458
[#5459]: #5459
[#5464]: #5464
[#5468]: #5468
[#5469]: #5469
[#5471]: #5471
[#5474]: #5474
[#5475]: #5475
[#5477]: #5477
[#5480]: #5480
[#5481]: #5481
[#5483]: #5483
[#5486]: #5486
[#5494]: #5494
[#5497]: #5497
[#5504]: #5504
[#5509]: #5509
[#5511]: #5511
[#5513]: #5513
[#5517]: #5517
renovate bot added a commit to smartive/zitadel-rust that referenced this pull request May 2, 2024
[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tokio](https://tokio.rs)
([source](https://togithub.com/tokio-rs/tokio)) | dev-dependencies |
minor | `1` -> `1.37.0` |
| [tokio](https://tokio.rs)
([source](https://togithub.com/tokio-rs/tokio)) | dependencies | minor |
`1` -> `1.37.0` |

---

### Release Notes

<details>
<summary>tokio-rs/tokio (tokio)</summary>

###
[`v1.37.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.37.0):
Tokio v1.37.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.36.0...tokio-1.37.0)

### 1.37.0 (March 28th, 2024)

##### Added

-   fs: add `set_max_buf_size` to `tokio::fs::File` ([#&#8203;6411])
- io: add `try_new` and `try_with_interest` to `AsyncFd`
([#&#8203;6345])
-   sync: add `forget_permits` method to semaphore ([#&#8203;6331])
- sync: add `is_closed`, `is_empty`, and `len` to mpsc receivers
([#&#8203;6348])
- sync: add a `rwlock()` method to owned `RwLock` guards
([#&#8203;6418])
- sync: expose strong and weak counts of mpsc sender handles
([#&#8203;6405])
-   sync: implement `Clone` for `watch::Sender` ([#&#8203;6388])
-   task: add `TaskLocalFuture::take_value` ([#&#8203;6340])
-   task: implement `FromIterator` for `JoinSet` ([#&#8203;6300])

##### Changed

- io: make `io::split` use a mutex instead of a spinlock
([#&#8203;6403])

##### Fixed

-   docs: fix docsrs build without net feature ([#&#8203;6360])
-   macros: allow select with only else branch ([#&#8203;6339])
- runtime: fix leaking registration entries when os registration fails
([#&#8203;6329])

##### Documented

- io: document cancel safety of `AsyncBufReadExt::fill_buf`
([#&#8203;6431])
- io: document cancel safety of `AsyncReadExt`'s primitive read
functions ([#&#8203;6337])
- runtime: add doc link from `Runtime` to `#[tokio::main]`
([#&#8203;6366])
-   runtime: make the `enter` example deterministic ([#&#8203;6351])
- sync: add Semaphore example for limiting the number of outgoing
requests ([#&#8203;6419])
-   sync: fix missing period in broadcast docs ([#&#8203;6377])
- sync: mark `mpsc::Sender::downgrade` with `#[must_use]`
([#&#8203;6326])
-   sync: reorder `const_new` before `new_with` ([#&#8203;6392])
-   sync: update watch channel docs ([#&#8203;6395])
-   task: fix documentation links ([#&#8203;6336])

##### Changed (unstable)

-   runtime: include task `Id` in taskdumps ([#&#8203;6328])
- runtime: panic if `unhandled_panic` is enabled when not supported
([#&#8203;6410])

[#&#8203;6300]: https://togithub.com/tokio-rs/tokio/pull/6300

[#&#8203;6326]: https://togithub.com/tokio-rs/tokio/pull/6326

[#&#8203;6328]: https://togithub.com/tokio-rs/tokio/pull/6328

[#&#8203;6329]: https://togithub.com/tokio-rs/tokio/pull/6329

[#&#8203;6331]: https://togithub.com/tokio-rs/tokio/pull/6331

[#&#8203;6336]: https://togithub.com/tokio-rs/tokio/pull/6336

[#&#8203;6337]: https://togithub.com/tokio-rs/tokio/pull/6337

[#&#8203;6339]: https://togithub.com/tokio-rs/tokio/pull/6339

[#&#8203;6340]: https://togithub.com/tokio-rs/tokio/pull/6340

[#&#8203;6345]: https://togithub.com/tokio-rs/tokio/pull/6345

[#&#8203;6348]: https://togithub.com/tokio-rs/tokio/pull/6348

[#&#8203;6351]: https://togithub.com/tokio-rs/tokio/pull/6351

[#&#8203;6360]: https://togithub.com/tokio-rs/tokio/pull/6360

[#&#8203;6366]: https://togithub.com/tokio-rs/tokio/pull/6366

[#&#8203;6377]: https://togithub.com/tokio-rs/tokio/pull/6377

[#&#8203;6388]: https://togithub.com/tokio-rs/tokio/pull/6388

[#&#8203;6392]: https://togithub.com/tokio-rs/tokio/pull/6392

[#&#8203;6395]: https://togithub.com/tokio-rs/tokio/pull/6395

[#&#8203;6403]: https://togithub.com/tokio-rs/tokio/pull/6403

[#&#8203;6405]: https://togithub.com/tokio-rs/tokio/pull/6405

[#&#8203;6410]: https://togithub.com/tokio-rs/tokio/pull/6410

[#&#8203;6411]: https://togithub.com/tokio-rs/tokio/pull/6411

[#&#8203;6418]: https://togithub.com/tokio-rs/tokio/pull/6418

[#&#8203;6419]: https://togithub.com/tokio-rs/tokio/pull/6419

[#&#8203;6431]: https://togithub.com/tokio-rs/tokio/pull/6431

###
[`v1.36.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.36.0):
Tokio v1.36.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.35.1...tokio-1.36.0)

### 1.36.0 (February 2nd, 2024)

##### Added

-   io: add `tokio::io::Join` ([#&#8203;6220])
-   io: implement `AsyncWrite` for `Empty` ([#&#8203;6235])
-   net: add support for anonymous unix pipes ([#&#8203;6127])
-   net: add `UnixSocket` ([#&#8203;6290])
-   net: expose keepalive option on `TcpSocket` ([#&#8203;6311])
- sync: add `{Receiver,UnboundedReceiver}::poll_recv_many`
([#&#8203;6236])
-   sync: add `Sender::{try_,}reserve_many` ([#&#8203;6205])
-   sync: add `watch::Receiver::mark_unchanged` ([#&#8203;6252])
-   task: add `JoinSet::try_join_next` ([#&#8203;6280])

##### Changed

-   io: make `copy` cooperative ([#&#8203;6265])
-   io: make `repeat` and `sink` cooperative ([#&#8203;6254])
-   io: simplify check for empty slice ([#&#8203;6293])
-   process: use pidfd on Linux when available ([#&#8203;6152])
-   sync: use AtomicBool in broadcast channel future ([#&#8203;6298])

##### Documented

-   io: clarify `clear_ready` docs ([#&#8203;6304])
- net: document that `*Fd` traits on `TcpSocket` are unix-only
([#&#8203;6294])
- sync: document FIFO behavior of `tokio::sync::Mutex` ([#&#8203;6279])
-   chore: typographic improvements ([#&#8203;6262])
-   runtime: remove obsolete comment ([#&#8203;6303])
-   task: fix typo ([#&#8203;6261])

[#&#8203;6220]: https://togithub.com/tokio-rs/tokio/pull/6220

[#&#8203;6235]: https://togithub.com/tokio-rs/tokio/pull/6235

[#&#8203;6127]: https://togithub.com/tokio-rs/tokio/pull/6127

[#&#8203;6290]: https://togithub.com/tokio-rs/tokio/pull/6290

[#&#8203;6311]: https://togithub.com/tokio-rs/tokio/pull/6311

[#&#8203;6236]: https://togithub.com/tokio-rs/tokio/pull/6236

[#&#8203;6205]: https://togithub.com/tokio-rs/tokio/pull/6205

[#&#8203;6252]: https://togithub.com/tokio-rs/tokio/pull/6252

[#&#8203;6280]: https://togithub.com/tokio-rs/tokio/pull/6280

[#&#8203;6265]: https://togithub.com/tokio-rs/tokio/pull/6265

[#&#8203;6254]: https://togithub.com/tokio-rs/tokio/pull/6254

[#&#8203;6293]: https://togithub.com/tokio-rs/tokio/pull/6293

[#&#8203;6238]: https://togithub.com/tokio-rs/tokio/pull/6238

[#&#8203;6152]: https://togithub.com/tokio-rs/tokio/pull/6152

[#&#8203;6298]: https://togithub.com/tokio-rs/tokio/pull/6298

[#&#8203;6262]: https://togithub.com/tokio-rs/tokio/pull/6262

[#&#8203;6303]: https://togithub.com/tokio-rs/tokio/pull/6303

[#&#8203;6261]: https://togithub.com/tokio-rs/tokio/pull/6261

[#&#8203;6304]: https://togithub.com/tokio-rs/tokio/pull/6304

[#&#8203;6294]: https://togithub.com/tokio-rs/tokio/pull/6294

[#&#8203;6279]: https://togithub.com/tokio-rs/tokio/pull/6279

###
[`v1.35.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.35.1):
Tokio v1.35.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.35.0...tokio-1.35.1)

### 1.35.1 (December 19, 2023)

This is a forward part of a change that was backported to 1.25.3.

##### Fixed

- io: add budgeting to `tokio::runtime::io::registration::async_io`
([#&#8203;6221])

[#&#8203;6221]: https://togithub.com/tokio-rs/tokio/pull/6221

###
[`v1.35.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.35.0):
Tokio v1.35.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.34.0...tokio-1.35.0)

### 1.35.0 (December 8th, 2023)

##### Added

-   net: add Apple watchOS support ([#&#8203;6176])

##### Changed

- io: drop the `Sized` requirements from `AsyncReadExt.read_buf`
([#&#8203;6169])
-   runtime: make `Runtime` unwind safe ([#&#8203;6189])
-   runtime: reduce the lock contention in task spawn ([#&#8203;6001])
-   tokio: update nix dependency to 0.27.1 ([#&#8203;6190])

##### Fixed

-   chore: make `--cfg docsrs` work without net feature ([#&#8203;6166])
-   chore: use relaxed load for `unsync_load` on miri ([#&#8203;6179])
-   runtime: handle missing context on wake ([#&#8203;6148])
-   taskdump: fix taskdump cargo config example ([#&#8203;6150])
-   taskdump: skip notified tasks during taskdumps ([#&#8203;6194])
- tracing: avoid creating resource spans with current parent, use a None
parent instead ([#&#8203;6107])
-   tracing: make task span explicit root ([#&#8203;6158])

##### Documented

-   io: flush in `AsyncWriteExt` examples ([#&#8203;6149])
- runtime: document fairness guarantees and current behavior
([#&#8203;6145])
- task: document cancel safety of `LocalSet::run_until` ([#&#8203;6147])

[#&#8203;6001]: https://togithub.com/tokio-rs/tokio/pull/6001

[#&#8203;6107]: https://togithub.com/tokio-rs/tokio/pull/6107

[#&#8203;6144]: https://togithub.com/tokio-rs/tokio/pull/6144

[#&#8203;6145]: https://togithub.com/tokio-rs/tokio/pull/6145

[#&#8203;6147]: https://togithub.com/tokio-rs/tokio/pull/6147

[#&#8203;6148]: https://togithub.com/tokio-rs/tokio/pull/6148

[#&#8203;6149]: https://togithub.com/tokio-rs/tokio/pull/6149

[#&#8203;6150]: https://togithub.com/tokio-rs/tokio/pull/6150

[#&#8203;6158]: https://togithub.com/tokio-rs/tokio/pull/6158

[#&#8203;6166]: https://togithub.com/tokio-rs/tokio/pull/6166

[#&#8203;6169]: https://togithub.com/tokio-rs/tokio/pull/6169

[#&#8203;6176]: https://togithub.com/tokio-rs/tokio/pull/6176

[#&#8203;6179]: https://togithub.com/tokio-rs/tokio/pull/6179

[#&#8203;6189]: https://togithub.com/tokio-rs/tokio/pull/6189

[#&#8203;6190]: https://togithub.com/tokio-rs/tokio/pull/6190

[#&#8203;6194]: https://togithub.com/tokio-rs/tokio/pull/6194

###
[`v1.34.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.34.0):
Tokio v1.34.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.33.0...tokio-1.34.0)

##### Fixed

- io: allow `clear_readiness` after io driver shutdown ([#&#8203;6067])
-   io: fix integer overflow in `take` ([#&#8203;6080])
-   io: fix I/O resource hang ([#&#8203;6134])
-   sync: fix `broadcast::channel` link ([#&#8203;6100])

##### Changed

- macros: use `::core` qualified imports instead of `::std` inside
`tokio::test` macro ([#&#8203;5973])

##### Added

- fs: update cfg attr in `fs::read_dir` to include `aix`
([#&#8203;6075])
-   sync: add `mpsc::Receiver::recv_many` ([#&#8203;6010])
-   tokio: added vita target support ([#&#8203;6094])

[#&#8203;5973]: https://togithub.com/tokio-rs/tokio/pull/5973

[#&#8203;6067]: https://togithub.com/tokio-rs/tokio/pull/6067

[#&#8203;6080]: https://togithub.com/tokio-rs/tokio/pull/6080

[#&#8203;6134]: https://togithub.com/tokio-rs/tokio/pull/6134

[#&#8203;6100]: https://togithub.com/tokio-rs/tokio/pull/6100

[#&#8203;6075]: https://togithub.com/tokio-rs/tokio/pull/6075

[#&#8203;6010]: https://togithub.com/tokio-rs/tokio/pull/6010

[#&#8203;6094]: https://togithub.com/tokio-rs/tokio/pull/6094

###
[`v1.33.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.33.0):
Tokio v1.33.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.32.1...tokio-1.33.0)

### 1.33.0 (October 9, 2023)

##### Fixed

-   io: mark `Interest::add` with `#[must_use]` ([#&#8203;6037])
-   runtime: fix cache line size for RISC-V ([#&#8203;5994])
- sync: prevent lock poisoning in `watch::Receiver::wait_for`
([#&#8203;6021])
-   task: fix `spawn_local` source location ([#&#8203;5984])

##### Changed

- sync: use Acquire/Release orderings instead of SeqCst in `watch`
([#&#8203;6018])

##### Added

-   fs: add vectored writes to `tokio::fs::File` ([#&#8203;5958])
-   io: add `Interest::remove` method ([#&#8203;5906])
-   io: add vectored writes to `DuplexStream` ([#&#8203;5985])
-   net: add Apple tvOS support ([#&#8203;6045])
- sync: add `?Sized` bound to `{MutexGuard,OwnedMutexGuard}::map`
([#&#8203;5997])
- sync: add `watch::Receiver::mark_unseen` ([#&#8203;5962],
[#&#8203;6014], [#&#8203;6017])
-   sync: add `watch::Sender::new` ([#&#8203;5998])
-   sync: add const fn `OnceCell::from_value` ([#&#8203;5903])

##### Removed

-   remove unused `stats` feature ([#&#8203;5952])

##### Documented

- add missing backticks in code examples ([#&#8203;5938],
[#&#8203;6056])
-   fix typos ([#&#8203;5988], [#&#8203;6030])
-   process: document that `Child::wait` is cancel safe ([#&#8203;5977])
- sync: add examples for `Semaphore` ([#&#8203;5939], [#&#8203;5956],
[#&#8203;5978], [#&#8203;6031], [#&#8203;6032], [#&#8203;6050])
- sync: document that `broadcast` capacity is a lower bound
([#&#8203;6042])
-   sync: document that `const_new` is not instrumented ([#&#8203;6002])
- sync: improve cancel-safety documentation for `mpsc::Sender::send`
([#&#8203;5947])
-   sync: improve docs for `watch` channel ([#&#8203;5954])
-   taskdump: render taskdump documentation on docs.rs ([#&#8203;5972])

##### Unstable

-   taskdump: fix potential deadlock ([#&#8203;6036])

[#&#8203;5903]: https://togithub.com/tokio-rs/tokio/pull/5903

[#&#8203;5906]: https://togithub.com/tokio-rs/tokio/pull/5906

[#&#8203;5938]: https://togithub.com/tokio-rs/tokio/pull/5938

[#&#8203;5939]: https://togithub.com/tokio-rs/tokio/pull/5939

[#&#8203;5947]: https://togithub.com/tokio-rs/tokio/pull/5947

[#&#8203;5952]: https://togithub.com/tokio-rs/tokio/pull/5952

[#&#8203;5954]: https://togithub.com/tokio-rs/tokio/pull/5954

[#&#8203;5956]: https://togithub.com/tokio-rs/tokio/pull/5956

[#&#8203;5958]: https://togithub.com/tokio-rs/tokio/pull/5958

[#&#8203;5960]: https://togithub.com/tokio-rs/tokio/pull/5960

[#&#8203;5962]: https://togithub.com/tokio-rs/tokio/pull/5962

[#&#8203;5971]: https://togithub.com/tokio-rs/tokio/pull/5971

[#&#8203;5972]: https://togithub.com/tokio-rs/tokio/pull/5972

[#&#8203;5977]: https://togithub.com/tokio-rs/tokio/pull/5977

[#&#8203;5978]: https://togithub.com/tokio-rs/tokio/pull/5978

[#&#8203;5984]: https://togithub.com/tokio-rs/tokio/pull/5984

[#&#8203;5985]: https://togithub.com/tokio-rs/tokio/pull/5985

[#&#8203;5988]: https://togithub.com/tokio-rs/tokio/pull/5988

[#&#8203;5994]: https://togithub.com/tokio-rs/tokio/pull/5994

[#&#8203;5997]: https://togithub.com/tokio-rs/tokio/pull/5997

[#&#8203;5998]: https://togithub.com/tokio-rs/tokio/pull/5998

[#&#8203;6002]: https://togithub.com/tokio-rs/tokio/pull/6002

[#&#8203;6014]: https://togithub.com/tokio-rs/tokio/pull/6014

[#&#8203;6017]: https://togithub.com/tokio-rs/tokio/pull/6017

[#&#8203;6018]: https://togithub.com/tokio-rs/tokio/pull/6018

[#&#8203;6021]: https://togithub.com/tokio-rs/tokio/pull/6021

[#&#8203;6030]: https://togithub.com/tokio-rs/tokio/pull/6030

[#&#8203;6031]: https://togithub.com/tokio-rs/tokio/pull/6031

[#&#8203;6032]: https://togithub.com/tokio-rs/tokio/pull/6032

[#&#8203;6036]: https://togithub.com/tokio-rs/tokio/pull/6036

[#&#8203;6037]: https://togithub.com/tokio-rs/tokio/pull/6037

[#&#8203;6042]: https://togithub.com/tokio-rs/tokio/pull/6042

[#&#8203;6045]: https://togithub.com/tokio-rs/tokio/pull/6045

[#&#8203;6050]: https://togithub.com/tokio-rs/tokio/pull/6050

[#&#8203;6056]: https://togithub.com/tokio-rs/tokio/pull/6056

[#&#8203;6058]: https://togithub.com/tokio-rs/tokio/pull/6058

###
[`v1.32.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.32.1):
Tokio v1.32.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.32.0...tokio-1.32.1)

### 1.32.1 (December 19, 2023)

This is a forward part of a change that was backported to 1.25.3.

##### Fixed

- io: add budgeting to `tokio::runtime::io::registration::async_io`
([#&#8203;6221])

[#&#8203;6221]: https://togithub.com/tokio-rs/tokio/pull/6221

###
[`v1.32.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.32.0):
Tokio v1.32.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.31.0...tokio-1.32.0)

##### Fixed

- sync: fix potential quadratic behavior in `broadcast::Receiver`
([#&#8203;5925])

##### Added

-   process: stabilize `Command::raw_arg` ([#&#8203;5930])
-   io: enable awaiting error readiness ([#&#8203;5781])

##### Unstable

- rt(alt): improve the scalability of alt runtime as the number of cores
grows ([#&#8203;5935])

[#&#8203;5925]: https://togithub.com/tokio-rs/tokio/pull/5925

[#&#8203;5930]: https://togithub.com/tokio-rs/tokio/pull/5930

[#&#8203;5781]: https://togithub.com/tokio-rs/tokio/pull/5781

[#&#8203;5935]: https://togithub.com/tokio-rs/tokio/pull/5935

###
[`v1.31.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.31.0):
Tokio v1.31.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.30.0...tokio-1.31.0)

##### Fixed

-   io: delegate `WriteHalf::poll_write_vectored` ([#&#8203;5914])

##### Unstable

- rt(unstable): fix memory leak in unstable next-gen scheduler prototype
([#&#8203;5911])
-   rt: expose mean task poll time metric ([#&#8203;5927])

[#&#8203;5914]: https://togithub.com/tokio-rs/tokio/pull/5914

[#&#8203;5911]: https://togithub.com/tokio-rs/tokio/pull/5911

[#&#8203;5927]: https://togithub.com/tokio-rs/tokio/pull/5927

###
[`v1.30.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.30.0):
Tokio v1.30.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.29.1...tokio-1.30.0)

### 1.30.0 (August 9, 2023)

This release bumps the MSRV of Tokio to 1.63. ([#&#8203;5887])

##### Changed

-   tokio: reduce LLVM code generation ([#&#8203;5859])
- io: support `--cfg mio_unsupported_force_poll_poll` flag
([#&#8203;5881])
-   sync: make `const_new` methods always available ([#&#8203;5885])
-   sync: avoid false sharing in mpsc channel ([#&#8203;5829])
-   rt: pop at least one task from inject queue ([#&#8203;5908])

##### Added

-   sync: add `broadcast::Sender::new` ([#&#8203;5824])
-   net: implement `UCred` for espidf ([#&#8203;5868])
-   fs: add `File::options()` ([#&#8203;5869])
-   time: implement extra reset variants for `Interval` ([#&#8203;5878])
-   process: add `{ChildStd*}::into_owned_{fd, handle}` ([#&#8203;5899])

##### Removed

-   tokio: removed unused `tokio_*` cfgs ([#&#8203;5890])
-   remove build script to speed up compilation ([#&#8203;5887])

##### Documented

-   sync: mention lagging in docs for `broadcast::send` ([#&#8203;5820])
-   runtime: expand on sharing runtime docs ([#&#8203;5858])
- io: use vec in example for `AsyncReadExt::read_exact` ([#&#8203;5863])
-   time: mark `Sleep` as `!Unpin` in docs ([#&#8203;5916])
-   process: fix `raw_arg` not showing up in docs ([#&#8203;5865])

##### Unstable

-   rt: add runtime ID ([#&#8203;5864])
-   rt: initial implementation of new threaded runtime ([#&#8203;5823])

[#&#8203;5820]: https://togithub.com/tokio-rs/tokio/pull/5820

[#&#8203;5823]: https://togithub.com/tokio-rs/tokio/pull/5823

[#&#8203;5824]: https://togithub.com/tokio-rs/tokio/pull/5824

[#&#8203;5829]: https://togithub.com/tokio-rs/tokio/pull/5829

[#&#8203;5858]: https://togithub.com/tokio-rs/tokio/pull/5858

[#&#8203;5859]: https://togithub.com/tokio-rs/tokio/pull/5859

[#&#8203;5863]: https://togithub.com/tokio-rs/tokio/pull/5863

[#&#8203;5864]: https://togithub.com/tokio-rs/tokio/pull/5864

[#&#8203;5865]: https://togithub.com/tokio-rs/tokio/pull/5865

[#&#8203;5868]: https://togithub.com/tokio-rs/tokio/pull/5868

[#&#8203;5869]: https://togithub.com/tokio-rs/tokio/pull/5869

[#&#8203;5878]: https://togithub.com/tokio-rs/tokio/pull/5878

[#&#8203;5881]: https://togithub.com/tokio-rs/tokio/pull/5881

[#&#8203;5885]: https://togithub.com/tokio-rs/tokio/pull/5885

[#&#8203;5887]: https://togithub.com/tokio-rs/tokio/pull/5887

[#&#8203;5890]: https://togithub.com/tokio-rs/tokio/pull/5890

[#&#8203;5899]: https://togithub.com/tokio-rs/tokio/pull/5899

[#&#8203;5908]: https://togithub.com/tokio-rs/tokio/pull/5908

[#&#8203;5916]: https://togithub.com/tokio-rs/tokio/pull/5916

###
[`v1.29.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.29.1):
Tokio v1.29.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.29.0...tokio-1.29.1)

##### Fixed

- rt: fix nesting two `block_in_place` with a `block_on` between
([#&#8203;5837])

[#&#8203;5837]: https://togithub.com/tokio-rs/tokio/pull/5837

###
[`v1.29.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.29.0):
Tokio v1.29.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.28.2...tokio-1.29.0)

Technically a breaking change, the `Send` implementation is removed from
`runtime::EnterGuard`. This change fixes a bug and should not impact
most users.

##### Breaking

-   rt: `EnterGuard` should not be `Send` ([#&#8203;5766])

##### Fixed

-   fs: reduce blocking ops in `fs::read_dir` ([#&#8203;5653])
-   rt: fix possible starvation ([#&#8203;5686], [#&#8203;5712])
-   rt: fix stacked borrows issue in `JoinSet` ([#&#8203;5693])
-   rt: panic if `EnterGuard` dropped incorrect order ([#&#8203;5772])
-   time: do not overflow to signal value ([#&#8203;5710])
-   fs: wait for in-flight ops before cloning `File` ([#&#8203;5803])

##### Changed

- rt: reduce time to poll tasks scheduled from outside the runtime
([#&#8203;5705], [#&#8203;5720])

##### Added

-   net: add uds doc alias for unix sockets ([#&#8203;5659])
-   rt: add metric for number of tasks ([#&#8203;5628])
-   sync: implement more traits for channel errors ([#&#8203;5666])
-   net: add nodelay methods on TcpSocket ([#&#8203;5672])
-   sync: add `broadcast::Receiver::blocking_recv` ([#&#8203;5690])
-   process: add `raw_arg` method to `Command` ([#&#8203;5704])
-   io: support PRIORITY epoll events ([#&#8203;5566])
-   task: add `JoinSet::poll_join_next` ([#&#8203;5721])
-   net: add support for Redox OS ([#&#8203;5790])

##### Unstable

- rt: add the ability to dump task backtraces ([#&#8203;5608],
[#&#8203;5676], [#&#8203;5708], [#&#8203;5717])
-   rt: instrument task poll times with a histogram ([#&#8203;5685])

[#&#8203;5766]: https://togithub.com/tokio-rs/tokio/pull/5766

[#&#8203;5653]: https://togithub.com/tokio-rs/tokio/pull/5653

[#&#8203;5686]: https://togithub.com/tokio-rs/tokio/pull/5686

[#&#8203;5712]: https://togithub.com/tokio-rs/tokio/pull/5712

[#&#8203;5693]: https://togithub.com/tokio-rs/tokio/pull/5693

[#&#8203;5772]: https://togithub.com/tokio-rs/tokio/pull/5772

[#&#8203;5710]: https://togithub.com/tokio-rs/tokio/pull/5710

[#&#8203;5803]: https://togithub.com/tokio-rs/tokio/pull/5803

[#&#8203;5705]: https://togithub.com/tokio-rs/tokio/pull/5705

[#&#8203;5720]: https://togithub.com/tokio-rs/tokio/pull/5720

[#&#8203;5659]: https://togithub.com/tokio-rs/tokio/pull/5659

[#&#8203;5628]: https://togithub.com/tokio-rs/tokio/pull/5628

[#&#8203;5666]: https://togithub.com/tokio-rs/tokio/pull/5666

[#&#8203;5672]: https://togithub.com/tokio-rs/tokio/pull/5672

[#&#8203;5690]: https://togithub.com/tokio-rs/tokio/pull/5690

[#&#8203;5704]: https://togithub.com/tokio-rs/tokio/pull/5704

[#&#8203;5566]: https://togithub.com/tokio-rs/tokio/pull/5566

[#&#8203;5721]: https://togithub.com/tokio-rs/tokio/pull/5721

[#&#8203;5790]: https://togithub.com/tokio-rs/tokio/pull/5790

[#&#8203;5608]: https://togithub.com/tokio-rs/tokio/pull/5608

[#&#8203;5676]: https://togithub.com/tokio-rs/tokio/pull/5676

[#&#8203;5708]: https://togithub.com/tokio-rs/tokio/pull/5708

[#&#8203;5717]: https://togithub.com/tokio-rs/tokio/pull/5717

[#&#8203;5685]: https://togithub.com/tokio-rs/tokio/pull/5685

###
[`v1.28.2`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.28.2):
Tokio v1.28.2

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.28.1...tokio-1.28.2)

### 1.28.2 (May 28, 2023)

Forward ports 1.18.6 changes.

##### Fixed

-   deps: disable default features for mio ([#&#8203;5728])

[#&#8203;5728]: https://togithub.com/tokio-rs/tokio/pull/5728

###
[`v1.28.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.28.1):
Tokio v1.28.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.28.0...tokio-1.28.1)

### 1.28.1 (May 10th, 2023)

This release fixes a mistake in the build script that makes `AsFd`
implementations unavailable on Rust 1.63. ([#&#8203;5677])

[#&#8203;5677]: https://togithub.com/tokio-rs/tokio/pull/5677

###
[`v1.28.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.28.0):
Tokio v1.28.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.27.0...tokio-1.28.0)

### 1.28.0 (April 25th, 2023)

##### Added

-   io: add `AsyncFd::async_io` ([#&#8203;5542])
-   io: impl BufMut for ReadBuf ([#&#8203;5590])
- net: add `recv_buf` for `UdpSocket` and `UnixDatagram`
([#&#8203;5583])
-   sync: add `OwnedSemaphorePermit::semaphore` ([#&#8203;5618])
-   sync: add `same_channel` to broadcast channel ([#&#8203;5607])
-   sync: add `watch::Receiver::wait_for` ([#&#8203;5611])
- task: add `JoinSet::spawn_blocking` and `JoinSet::spawn_blocking_on`
([#&#8203;5612])

##### Changed

-   deps: update windows-sys to 0.48 ([#&#8203;5591])
-   io: make `read_to_end` not grow unnecessarily ([#&#8203;5610])
-   macros: make entrypoints more efficient ([#&#8203;5621])
-   sync: improve Debug impl for `RwLock` ([#&#8203;5647])
-   sync: reduce contention in `Notify` ([#&#8203;5503])

##### Fixed

-   net: support `get_peer_cred` on AIX ([#&#8203;5065])
- sync: avoid deadlocks in `broadcast` with custom wakers
([#&#8203;5578])

##### Documented

-   sync: fix typo in `Semaphore::MAX_PERMITS` ([#&#8203;5645])
-   sync: fix typo in `tokio::sync::watch::Sender` docs ([#&#8203;5587])

[#&#8203;5065]: https://togithub.com/tokio-rs/tokio/pull/5065

[#&#8203;5503]: https://togithub.com/tokio-rs/tokio/pull/5503

[#&#8203;5542]: https://togithub.com/tokio-rs/tokio/pull/5542

[#&#8203;5578]: https://togithub.com/tokio-rs/tokio/pull/5578

[#&#8203;5583]: https://togithub.com/tokio-rs/tokio/pull/5583

[#&#8203;5587]: https://togithub.com/tokio-rs/tokio/pull/5587

[#&#8203;5590]: https://togithub.com/tokio-rs/tokio/pull/5590

[#&#8203;5591]: https://togithub.com/tokio-rs/tokio/pull/5591

[#&#8203;5607]: https://togithub.com/tokio-rs/tokio/pull/5607

[#&#8203;5610]: https://togithub.com/tokio-rs/tokio/pull/5610

[#&#8203;5611]: https://togithub.com/tokio-rs/tokio/pull/5611

[#&#8203;5612]: https://togithub.com/tokio-rs/tokio/pull/5612

[#&#8203;5618]: https://togithub.com/tokio-rs/tokio/pull/5618

[#&#8203;5621]: https://togithub.com/tokio-rs/tokio/pull/5621

[#&#8203;5645]: https://togithub.com/tokio-rs/tokio/pull/5645

[#&#8203;5647]: https://togithub.com/tokio-rs/tokio/pull/5647

###
[`v1.27.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.27.0):
Tokio v1.27.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.26.0...tokio-1.27.0)

### 1.27.0 (March 27th, 2023)

This release bumps the MSRV of Tokio to 1.56. ([#&#8203;5559])

##### Added

-   io: add `async_io` helper method to sockets ([#&#8203;5512])
- io: add implementations of `AsFd`/`AsHandle`/`AsSocket`
([#&#8203;5514], [#&#8203;5540])
-   net: add `UdpSocket::peek_sender()` ([#&#8203;5520])
- sync: add `RwLockWriteGuard::{downgrade_map, try_downgrade_map}`
([#&#8203;5527])
-   task: add `JoinHandle::abort_handle` ([#&#8203;5543])

##### Changed

-   io: use `memchr` from `libc` ([#&#8203;5558])
- macros: accept path as crate rename in `#[tokio::main]`
([#&#8203;5557])
-   macros: update to syn 2.0.0 ([#&#8203;5572])
- time: don't register for a wakeup when `Interval` returns `Ready`
([#&#8203;5553])

##### Fixed

-   fs: fuse std iterator in `ReadDir` ([#&#8203;5555])
-   tracing: fix `spawn_blocking` location fields ([#&#8203;5573])
-   time: clean up redundant check in `Wheel::poll()` ([#&#8203;5574])

##### Documented

-   macros: define cancellation safety ([#&#8203;5525])
-   io: add details to docs of `tokio::io::copy[_buf]` ([#&#8203;5575])
- io: refer to `ReaderStream` and `StreamReader` in module docs
([#&#8203;5576])

[#&#8203;5512]: https://togithub.com/tokio-rs/tokio/pull/5512

[#&#8203;5514]: https://togithub.com/tokio-rs/tokio/pull/5514

[#&#8203;5520]: https://togithub.com/tokio-rs/tokio/pull/5520

[#&#8203;5525]: https://togithub.com/tokio-rs/tokio/pull/5525

[#&#8203;5527]: https://togithub.com/tokio-rs/tokio/pull/5527

[#&#8203;5540]: https://togithub.com/tokio-rs/tokio/pull/5540

[#&#8203;5543]: https://togithub.com/tokio-rs/tokio/pull/5543

[#&#8203;5553]: https://togithub.com/tokio-rs/tokio/pull/5553

[#&#8203;5555]: https://togithub.com/tokio-rs/tokio/pull/5555

[#&#8203;5557]: https://togithub.com/tokio-rs/tokio/pull/5557

[#&#8203;5558]: https://togithub.com/tokio-rs/tokio/pull/5558

[#&#8203;5559]: https://togithub.com/tokio-rs/tokio/pull/5559

[#&#8203;5572]: https://togithub.com/tokio-rs/tokio/pull/5572

[#&#8203;5573]: https://togithub.com/tokio-rs/tokio/pull/5573

[#&#8203;5574]: https://togithub.com/tokio-rs/tokio/pull/5574

[#&#8203;5575]: https://togithub.com/tokio-rs/tokio/pull/5575

[#&#8203;5576]: https://togithub.com/tokio-rs/tokio/pull/5576

###
[`v1.26.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.26.0):
Tokio v1.26.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.25.3...tokio-1.26.0)

##### Fixed

- macros: fix empty `join!` and `try_join!`
([[https://github.com/tokio-rs/tokio/pull/5504](https://togithub.com/tokio-rs/tokio/pull/5504)])
- sync: don't leak tracing spans in mutex guards
([[https://github.com/tokio-rs/tokio/pull/5469](https://togithub.com/tokio-rs/tokio/pull/5469)])
- sync: drop wakers after unlocking the mutex in Notify
([[https://github.com/tokio-rs/tokio/pull/5471](https://togithub.com/tokio-rs/tokio/pull/5471)])
- sync: drop wakers outside lock in semaphore
([[https://github.com/tokio-rs/tokio/pull/5475](https://togithub.com/tokio-rs/tokio/pull/5475)])

##### Added

- fs: add `fs::try_exists`
([[https://github.com/tokio-rs/tokio/pull/4299](https://togithub.com/tokio-rs/tokio/pull/4299)])
- net: add types for named unix pipes
([[https://github.com/tokio-rs/tokio/pull/5351](https://togithub.com/tokio-rs/tokio/pull/5351)])
- sync: add `MappedOwnedMutexGuard`
([[https://github.com/tokio-rs/tokio/pull/5474](https://togithub.com/tokio-rs/tokio/pull/5474)])

##### Changed

- chore: update windows-sys to 0.45
([[https://github.com/tokio-rs/tokio/pull/5386](https://togithub.com/tokio-rs/tokio/pull/5386)])
- net: use Message Read Mode for named pipes
([[https://github.com/tokio-rs/tokio/pull/5350](https://togithub.com/tokio-rs/tokio/pull/5350)])
- sync: mark lock guards with `#[clippy::has_significant_drop]`
([[https://github.com/tokio-rs/tokio/pull/5422](https://togithub.com/tokio-rs/tokio/pull/5422)])
- sync: reduce contention in watch channel
([[https://github.com/tokio-rs/tokio/pull/5464](https://togithub.com/tokio-rs/tokio/pull/5464)])
- time: remove cache padding in timer entries
([[https://github.com/tokio-rs/tokio/pull/5468](https://togithub.com/tokio-rs/tokio/pull/5468)])
- time: Improve `Instant::now()` perf with test-util
([[https://github.com/tokio-rs/tokio/pull/5513](https://togithub.com/tokio-rs/tokio/pull/5513)])

##### Internal Changes

- io: use `poll_fn` in `copy_bidirectional`
([[https://github.com/tokio-rs/tokio/pull/5486](https://togithub.com/tokio-rs/tokio/pull/5486)])
- net: refactor named pipe builders to not use bitfields
([[https://github.com/tokio-rs/tokio/pull/5477](https://togithub.com/tokio-rs/tokio/pull/5477)])
- rt: remove Arc from Clock
([[https://github.com/tokio-rs/tokio/pull/5434](https://togithub.com/tokio-rs/tokio/pull/5434)])
- sync: make `notify_waiters` calls atomic
([[https://github.com/tokio-rs/tokio/pull/5458](https://togithub.com/tokio-rs/tokio/pull/5458)])
- time: don't store deadline twice in sleep entries
([[https://github.com/tokio-rs/tokio/pull/5410](https://togithub.com/tokio-rs/tokio/pull/5410)])

##### Unstable

- metrics: add a new metric for budget exhaustion yields
([[https://github.com/tokio-rs/tokio/pull/5517](https://togithub.com/tokio-rs/tokio/pull/5517)])

##### Documented

- io: improve AsyncFd example
([[https://github.com/tokio-rs/tokio/pull/5481](https://togithub.com/tokio-rs/tokio/pull/5481)])
- runtime: document the nature of the main future
([[https://github.com/tokio-rs/tokio/pull/5494](https://togithub.com/tokio-rs/tokio/pull/5494)])
- runtime: remove extra period in docs
([[https://github.com/tokio-rs/tokio/pull/5511](https://togithub.com/tokio-rs/tokio/pull/5511)])
- signal: updated Documentation for Signals
([[https://github.com/tokio-rs/tokio/pull/5459](https://togithub.com/tokio-rs/tokio/pull/5459)])
- sync: add doc aliases for `blocking_*` methods
([[https://github.com/tokio-rs/tokio/pull/5448](https://togithub.com/tokio-rs/tokio/pull/5448)])
- sync: fix docs for Send/Sync bounds in broadcast
([[https://github.com/tokio-rs/tokio/pull/5480](https://togithub.com/tokio-rs/tokio/pull/5480)])
- sync: document drop behavior for channels
([[https://github.com/tokio-rs/tokio/pull/5497](https://togithub.com/tokio-rs/tokio/pull/5497)])
- task: clarify what happens to spawned work during runtime shutdown
([[https://github.com/tokio-rs/tokio/pull/5394](https://togithub.com/tokio-rs/tokio/pull/5394)])
- task: clarify `process::Command` docs
([[https://github.com/tokio-rs/tokio/pull/5413](https://togithub.com/tokio-rs/tokio/pull/5413)])
- task: fix wording with 'unsend'
([[https://github.com/tokio-rs/tokio/pull/5452](https://togithub.com/tokio-rs/tokio/pull/5452)])
- time: document immediate completion guarantee for timeouts
([[https://github.com/tokio-rs/tokio/pull/5509](https://togithub.com/tokio-rs/tokio/pull/5509)])
- tokio: document supported platforms
([[https://github.com/tokio-rs/tokio/pull/5483](https://togithub.com/tokio-rs/tokio/pull/5483)])

[https://github.com/tokio-rs/tokio/pull/4299]:
https://togithub.com/tokio-rs/tokio/pull/4299

[https://github.com/tokio-rs/tokio/pull/5350]:
https://togithub.com/tokio-rs/tokio/pull/5350

[https://github.com/tokio-rs/tokio/pull/5351]:
https://togithub.com/tokio-rs/tokio/pull/5351

[https://github.com/tokio-rs/tokio/pull/5386]:
https://togithub.com/tokio-rs/tokio/pull/5386

[https://github.com/tokio-rs/tokio/pull/5394]:
https://togithub.com/tokio-rs/tokio/pull/5394

[https://github.com/tokio-rs/tokio/pull/5410]:
https://togithub.com/tokio-rs/tokio/pull/5410

[https://github.com/tokio-rs/tokio/pull/5413]:
https://togithub.com/tokio-rs/tokio/pull/5413

[https://github.com/tokio-rs/tokio/pull/5422]:
https://togithub.com/tokio-rs/tokio/pull/5422

[https://github.com/tokio-rs/tokio/pull/5434]:
https://togithub.com/tokio-rs/tokio/pull/5434

[https://github.com/tokio-rs/tokio/pull/5448]:
https://togithub.com/tokio-rs/tokio/pull/5448

[https://github.com/tokio-rs/tokio/pull/5452]:
https://togithub.com/tokio-rs/tokio/pull/5452

[https://github.com/tokio-rs/tokio/pull/5458]:
https://togithub.com/tokio-rs/tokio/pull/5458

[https://github.com/tokio-rs/tokio/pull/5459]:
https://togithub.com/tokio-rs/tokio/pull/5459

[https://github.com/tokio-rs/tokio/pull/5464]:
https://togithub.com/tokio-rs/tokio/pull/5464

[https://github.com/tokio-rs/tokio/pull/5468]:
https://togithub.com/tokio-rs/tokio/pull/5468

[https://github.com/tokio-rs/tokio/pull/5469]:
https://togithub.com/tokio-rs/tokio/pull/5469

[https://github.com/tokio-rs/tokio/pull/5471]:
https://togithub.com/tokio-rs/tokio/pull/5471

[https://github.com/tokio-rs/tokio/pull/5474]:
https://togithub.com/tokio-rs/tokio/pull/5474

[https://github.com/tokio-rs/tokio/pull/5475]:
https://togithub.com/tokio-rs/tokio/pull/5475

[https://github.com/tokio-rs/tokio/pull/5477]:
https://togithub.com/tokio-rs/tokio/pull/5477

[https://github.com/tokio-rs/tokio/pull/5480]:
https://togithub.com/tokio-rs/tokio/pull/5480

[https://github.com/tokio-rs/tokio/pull/5481]:
https://togithub.com/tokio-rs/tokio/pull/5481

[https://github.com/tokio-rs/tokio/pull/5483]:
https://togithub.com/tokio-rs/tokio/pull/5483

[https://github.com/tokio-rs/tokio/pull/5486]:
https://togithub.com/tokio-rs/tokio/pull/5486

[https://github.com/tokio-rs/tokio/pull/5494]:
https://togithub.com/tokio-rs/tokio/pull/5494

[https://github.com/tokio-rs/tokio/pull/5497]:
https://togithub.com/tokio-rs/tokio/pull/5497

[https://github.com/tokio-rs/tokio/pull/5504]:
https://togithub.com/tokio-rs/tokio/pull/5504

[https://github.com/tokio-rs/tokio/pull/5509]:
https://togithub.com/tokio-rs/tokio/pull/5509

[https://github.com/tokio-rs/tokio/pull/5511]:
https://togithub.com/tokio-rs/tokio/pull/5511

[https://github.com/tokio-rs/tokio/pull/5513]:
https://togithub.com/tokio-rs/tokio/pull/5513

[https://github.com/tokio-rs/tokio/pull/5517]:
https://togithub.com/tokio-rs/tokio/pull/5517

###
[`v1.25.3`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.25.3):
Tokio v1.25.3

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.25.2...tokio-1.25.3)

### 1.25.3 (December 17th, 2023)

##### Fixed

- io: add budgeting to `tokio::runtime::io::registration::async_io`
([#&#8203;6221])

[#&#8203;6221]: https://togithub.com/tokio-rs/tokio/pull/6221

###
[`v1.25.2`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.25.2):
Tokio v1.25.2

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.25.1...tokio-1.25.2)

### 1.25.2 (September 22, 2023)

Forward ports 1.20.6 changes.

##### Changed

-   io: use `memchr` from `libc` ([#&#8203;5960])

[#&#8203;5960]: https://togithub.com/tokio-rs/tokio/pull/5960

###
[`v1.25.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.25.1):
Tokio v1.25.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.25.0...tokio-1.25.1)

### 1.25.1 (May 28, 2023)

Forward ports 1.18.6 changes.

##### Fixed

-   deps: disable default features for mio ([#&#8203;5728])

[#&#8203;5728]: https://togithub.com/tokio-rs/tokio/pull/5728

###
[`v1.25.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.25.0):
Tokio v1.25.0

### 1.25.0 (January 28, 2023)

##### Fixed

-   rt: fix runtime metrics reporting ([#&#8203;5330])

##### Added

-   sync: add `broadcast::Sender::len` ([#&#8203;5343])

##### Changed

-   fs: increase maximum read buffer size to 2MiB ([#&#8203;5397])

[#&#8203;5330]: https://togithub.com/tokio-rs/tokio/pull/5330

[#&#8203;5343]: https://togithub.com/tokio-rs/tokio/pull/5343

[#&#8203;5397]: https://togithub.com/tokio-rs/tokio/pull/5397

###
[`v1.24.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.24.1):
Tokio v1.24.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.24.0...tokio-1.24.1)

This release fixes a compilation failure on targets without `AtomicU64`
when using rustc older than 1.63. ([#&#8203;5356])

[#&#8203;5356]: https://togithub.com/tokio-rs/tokio/pull/5356

###
[`v1.24.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.24.0):
Tokio v1.24.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.23.1...tokio-1.24.0)

The highlight of this release is the reduction of lock contention for
all I/O operations
([#&#8203;5300](https://togithub.com/tokio-rs/tokio/issues/5300)). We
have received reports of up to a 20% improvement in CPU utilization and
increased throughput for real-world I/O heavy applications.

##### Fixed

-   rt: improve native `AtomicU64` support detection ([#&#8203;5284])

##### Added

- rt: add configuration option for max number of I/O events polled from
the OS
    per tick ([#&#8203;5186])
- rt: add an environment variable for configuring the default number of
worker
    threads per runtime instance ([#&#8203;4250])

##### Changed

-   sync: reduce MPSC channel stack usage ([#&#8203;5294])
-   io: reduce lock contention in I/O operations  ([#&#8203;5300])
-   fs: speed up `read_dir()` by chunking operations ([#&#8203;5309])
-   rt: use internal `ThreadId` implementation ([#&#8203;5329])
- test: don't auto-advance time when a `spawn_blocking` task is running
([#&#8203;5115])

[#&#8203;5186]: https://togithub.com/tokio-rs/tokio/pull/5186

[#&#8203;5294]: https://togithub.com/tokio-rs/tokio/pull/5294

[#&#8203;5284]: https://togithub.com/tokio-rs/tokio/pull/5284

[#&#8203;4250]: https://togithub.com/tokio-rs/tokio/pull/4250

[#&#8203;5300]: https://togithub.com/tokio-rs/tokio/pull/5300

[#&#8203;5329]: https://togithub.com/tokio-rs/tokio/pull/5329

[#&#8203;5115]: https://togithub.com/tokio-rs/tokio/pull/5115

[#&#8203;5309]: https://togithub.com/tokio-rs/tokio/pull/5309

###
[`v1.23.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.23.1):
Tokio v1.23.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.23.0...tokio-1.23.1)

This release forward ports changes from 1.18.4.

##### Fixed

- net: fix Windows named pipe server builder to maintain option when
toggling
    pipe mode ([#&#8203;5336]).

[#&#8203;5336]: https://togithub.com/tokio-rs/tokio/pull/5336

###
[`v1.23.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.23.0):
Tokio v1.23.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.22.0...tokio-1.23.0)

##### Fixed

-   net: fix Windows named pipe connect ([#&#8203;5208])
-   io: support vectored writes for `ChildStdin` ([#&#8203;5216])
- io: fix `async fn ready()` false positive for OS-specific events
([#&#8203;5231])

##### Changed

- runtime: `yield_now` defers task until after driver poll
([#&#8203;5223])
- runtime: reduce amount of codegen needed per spawned task
([#&#8203;5213])
- windows: replace `winapi` dependency with `windows-sys`
([#&#8203;5204])

[#&#8203;5208]: https://togithub.com/tokio-rs/tokio/pull/5208

[#&#8203;5216]: https://togithub.com/tokio-rs/tokio/pull/5216

[#&#8203;5213]: https://togithub.com/tokio-rs/tokio/pull/5213

[#&#8203;5204]: https://togithub.com/tokio-rs/tokio/pull/5204

[#&#8203;5223]: https://togithub.com/tokio-rs/tokio/pull/5223

[#&#8203;5231]: https://togithub.com/tokio-rs/tokio/pull/5231

###
[`v1.22.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.22.0):
Tokio v1.22.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.21.2...tokio-1.22.0)

##### Added

-   runtime: add `Handle::runtime_flavor` ([#&#8203;5138])
-   sync: add `Mutex::blocking_lock_owned` ([#&#8203;5130])
-   sync: add `Semaphore::MAX_PERMITS` ([#&#8203;5144])
-   sync: add `merge()` to semaphore permits ([#&#8203;4948])
-   sync: add `mpsc::WeakUnboundedSender` ([#&#8203;5189])

##### Added (unstable)

-   process: add `Command::process_group` ([#&#8203;5114])
- runtime: export metrics about the blocking thread pool
([#&#8203;5161])
-   task: add `task::id()` and `task::try_id()` ([#&#8203;5171])

##### Fixed

-   macros: don't take ownership of futures in macros ([#&#8203;5087])
- runtime: fix Stacked Borrows violation in `LocalOwnedTasks`
([#&#8203;5099])
- runtime: mitigate ABA with 32-bit queue indices when possible
([#&#8203;5042])
- task: wake local tasks to the local queue when woken by the same
thread ([#&#8203;5095])
- time: panic in release mode when `mark_pending` called illegally
([#&#8203;5093])
-   runtime: fix typo in expect message ([#&#8203;5169])
-   runtime: fix `unsync_load` on atomic types ([#&#8203;5175])
- task: elaborate safety comments in task deallocation ([#&#8203;5172])
-   runtime: fix `LocalSet` drop in thread local ([#&#8203;5179])
-   net: remove libc type leakage in a public API ([#&#8203;5191])
-   runtime: update the alignment of `CachePadded` ([#&#8203;5106])

##### Changed

- io: make `tokio::io::copy` continue filling the buffer when writer
stalls ([#&#8203;5066])
- runtime: remove `coop::budget` from `LocalSet::run_until`
([#&#8203;5155])
-   sync: make `Notify` panic safe ([#&#8203;5154])

##### Documented

-   io: fix doc for `write_i8` to use signed integers ([#&#8203;5040])
- net: fix doc typos for TCP and UDP `set_tos` methods ([#&#8203;5073])
- net: fix function name in `UdpSocket::recv` documentation
([#&#8203;5150])
- sync: typo in `TryLockError` for `RwLock::try_write` ([#&#8203;5160])
- task: document that spawned tasks execute immediately ([#&#8203;5117])
-   time: document return type of `timeout` ([#&#8203;5118])
- time: document that `timeout` checks only before poll ([#&#8203;5126])
- sync: specify return type of `oneshot::Receiver` in docs
([#&#8203;5198])

##### Internal changes

-   runtime: use const `Mutex::new` for globals ([#&#8203;5061])
- runtime: remove `Option` around `mio::Events` in io driver
([#&#8203;5078])
-   runtime: remove a conditional compilation clause ([#&#8203;5104])
-   runtime: remove a reference to internal time handle ([#&#8203;5107])
-   runtime: misc time driver cleanup ([#&#8203;5120])
-   runtime: move signal driver to runtime module ([#&#8203;5121])
-   runtime: signal driver now uses I/O driver directly ([#&#8203;5125])
-   runtime: start decoupling I/O driver and I/O handle ([#&#8203;5127])
- runtime: switch `io::handle` refs with scheduler:Handle
([#&#8203;5128])
-   runtime: remove Arc from I/O driver ([#&#8203;5134])
- runtime: use signal driver handle via `scheduler::Handle`
([#&#8203;5135])
-   runtime: move internal clock fns out of context ([#&#8203;5139])
-   runtime: remove `runtime::context` module ([#&#8203;5140])
-   runtime: keep driver cfgs in `driver.rs` ([#&#8203;5141])
- runtime: add `runtime::context` to unify thread-locals
([#&#8203;5143])
- runtime: rename some confusing internal variables/fns ([#&#8203;5151])
-   runtime: move `coop` mod into `runtime` ([#&#8203;5152])
-   runtime: move budget state to context thread-local ([#&#8203;5157])
-   runtime: move park logic into runtime module ([#&#8203;5158])
-   runtime: move `Runtime` into its own file ([#&#8203;5159])
- runtime: unify entering a runtime with `Handle::enter`
([#&#8203;5163])
- runtime: remove handle reference from each scheduler ([#&#8203;5166])
-   runtime: move `enter` into `context` ([#&#8203;5167])
-   runtime: combine context and entered thread-locals ([#&#8203;5168])
-   runtime: fix accidental unsetting of current handle ([#&#8203;5178])
-   runtime: move `CoreStage` methods to `Core` ([#&#8203;5182])
-   sync: name mpsc semaphore types ([#&#8203;5146])

[#&#8203;4948]: https://togithub.com/tokio-rs/tokio/pull/4948

[#&#8203;5040]: https://togithub.com/tokio-rs/tokio/pull/5040

[#&#8203;5042]: https://togithub.com/tokio-rs/tokio/pull/5042

[#&#8203;5061]: https://togithub.com/tokio-rs/tokio/pull/5061

[#&#8203;5066]: https://togithub.com/tokio-rs/tokio/pull/5066

[#&#8203;5073]: https://togithub.com/tokio-rs/tokio/pull/5073

[#&#8203;5078]: https://togithub.com/tokio-rs/tokio/pull/5078

[#&#8203;5087]: https://togithub.com/tokio-rs/tokio/pull/5087

[#&#8203;5093]: https://togithub.com/tokio-rs/tokio/pull/5093

[#&#8203;5095]: https://togithub.com/tokio-rs/tokio/pull/5095

[#&#8203;5099]: https://togithub.com/tokio-rs/tokio/pull/5099

[#&#8203;5104]: https://togithub.com/tokio-rs/tokio/pull/5104

[#&#8203;5106]: https://togithub.com/tokio-rs/tokio/pull/5106

[#&#8203;5107]: https://togithub.com/tokio-rs/tokio/pull/5107

[#&#8203;5114]: https://togithub.com/tokio-rs/tokio/pull/5114

[#&#8203;5117]: https://togithub.com/tokio-rs/tokio/pull/5117

[#&#8203;5118]: https://togithub.com/tokio-rs/tokio/pull/5118

[#&#8203;5120]: https://togithub.com/tokio-rs/tokio/pull/5120

[#&#8203;5121]: https://togithub.com/tokio-rs/tokio/pull/5121

[#&#8203;5125]: https://togithub.com/tokio-rs/tokio/pull/5125

[#&#8203;5126]: https://togithub.com/tokio-rs/tokio/pull/5126

[#&#8203;5127]: https://togithub.com/tokio-rs/tokio/pull/5127

[#&#8203;5128]: https://togithub.com/tokio-rs/tokio/pull/5128

[#&#8203;5130]: https://togithub.com/tokio-rs/tokio/pull/5130

[#&#8203;5134]: https://togithub.com/tokio-rs/tokio/pull/5134

[#&#8203;5135]: https://togithub.com/tokio-rs/tokio/pull/5135

[#&#8203;5138]: https://togithub.com/tokio-rs/tokio/pull/5138

[#&#8203;5138]: https://togithub.com/tokio-rs/tokio/pull/5138

[#&#8203;5139]: https://togithub.com/tokio-rs/tokio/pull/5139

[#&#8203;5140]: https://togithub.com/tokio-rs/tokio/pull/5140

[#&#8203;5141]: https://togithub.com/tokio-rs/tokio/pull/5141

[#&#8203;5143]: https://togithub.com/tokio-rs/tokio/pull/5143

[#&#8203;5144]: https://togithub.com/tokio-rs/tokio/pull/5144

[#&#8203;5144]: https://togithub.com/tokio-rs/tokio/pull/5144

[#&#8203;5146]: https://togithub.com/tokio-rs/tokio/pull/5146

[#&#8203;5150]: https://togithub.com/tokio-rs/tokio/pull/5150

[#&#8203;5151]: https://togithub.com/tokio-rs/tokio/pull/5151

[#&#8203;5152]: https://togithub.com/tokio-rs/tokio/pull/5152

[#&#8203;5154]: https://togithub.com/tokio-rs/tokio/pull/5154

[#&#8203;5155]: https://togithub.com/tokio-rs/tokio/pull/5155

[#&#8203;5157]: https://togithub.com/tokio-rs/tokio/pull/5157

[#&#8203;5158]: https://togithub.com/tokio-rs/tokio/pull/5158

[#&#8203;5159]: https://togithub.com/tokio-rs/tokio/pull/5159

[#&#8203;5160]: https://togithub.com/tokio-rs/tokio/pull/5160

[#&#8203;5161]: https://togithub.com/tokio-rs/tokio/pull/5161

[#&#8203;5163]: https://togithub.com/tokio-rs/tokio/pull/5163

[#&#8203;5166]: https://togithub.com/tokio-rs/tokio/pull/5166

[#&#8203;5167]: https://togithub.com/tokio-rs/tokio/pull/5167

[#&#8203;5168]: https://togithub.com/tokio-rs/tokio/pull/5168

[#&#8203;5169]: https://togithub.com/tokio-rs/tokio/pull/5169

[#&#8203;5171]: https://togithub.com/tokio-rs/tokio/pull/5171

[#&#8203;5172]: https://togithub.com/tokio-rs/tokio/pull/5172

[#&#8203;5175]: https://togithub.com/tokio-rs/tokio/pull/5175

[#&#8203;5178]: https://togithub.com/tokio-rs/tokio/pull/5178

[#&#8203;5179]: https://togithub.com/tokio-rs/tokio/pull/5179

[#&#8203;5182]: https://togithub.com/tokio-rs/tokio/pull/5182

[#&#8203;5189]: https://togithub.com/tokio-rs/tokio/pull/5189

[#&#8203;5191]: https://togithub.com/tokio-rs/tokio/pull/5191

[#&#8203;5198]: https://togithub.com/tokio-rs/tokio/pull/5198

###
[`v1.21.2`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.21.2):
Tokio v1.21.2

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.21.1...tokio-1.21.2)

### 1.21.2 (September 27, 2022)

This release removes the dependency on the `once_cell` crate to restore
the MSRV of 1.21.x, which is the latest minor version at the time of
release. ([#&#8203;5048])

[#&#8203;5048]: https://togithub.com/tokio-rs/tokio/pull/5048

###
[`v1.21.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.21.1):
Tokio v1.21.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.21.0...tokio-1.21.1)

### 1.21.1 (September 13, 2022)

##### Fixed

-   net: fix dependency resolution for socket2 ([#&#8203;5000])
-   task: ignore failure to set TLS in `LocalSet` Drop ([#&#8203;4976])

[#&#8203;4976]: https://togithub.com/tokio-rs/tokio/pull/4976

[#&#8203;5000]: https://togithub.com/tokio-rs/tokio/pull/5000

###
[`v1.21.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.21.0):
Tokio v1.21.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.6...tokio-1.21.0)

### 1.21.0 (September 2, 2022)

This release is the first release of Tokio to intentionally support
WASM. The `sync,macros,io-util,rt,time` features are stabilized on WASM.
Additionally the wasm32-wasi target is given unstable support for the
`net` feature.

##### Added

- net: add `device` and `bind_device` methods to TCP/UDP sockets
([#&#8203;4882])
- net: add `tos` and `set_tos` methods to TCP and UDP sockets
([#&#8203;4877])
- net: add security flags to named pipe `ServerOptions` ([#&#8203;4845])
-   signal: add more windows signal handlers ([#&#8203;4924])
-   sync: add `mpsc::Sender::max_capacity` method ([#&#8203;4904])
-   sync: implement Weak version of `mpsc::Sender` ([#&#8203;4595])
-   task: add `LocalSet::enter` ([#&#8203;4765])
-   task: stabilize `JoinSet` and `AbortHandle` ([#&#8203;4920])
- tokio: add `track_caller` to public APIs ([#&#8203;4805],
[#&#8203;4848], [#&#8203;4852])
-   wasm: initial support for `wasm32-wasi` target ([#&#8203;4716])

##### Fixed

- miri: improve miri compatibility by avoiding temporary references in
`linked_list::Link` impls ([#&#8203;4841])
- signal: don't register write interest on signal pipe ([#&#8203;4898])
-   sync: add `#[must_use]` to lock guards ([#&#8203;4886])
- sync: fix hang when calling `recv` on closed and reopened broadcast
channel ([#&#8203;4867])
-   task: propagate attributes on task-locals ([#&#8203;4837])

##### Changed

-   fs: change panic to error in `File::start_seek` ([#&#8203;4897])
-   io: reduce syscalls in `poll_read` ([#&#8203;4840])
- process: use blocking threadpool for child stdio I/O ([#&#8203;4824])
-   signal: make `SignalKind` methods const ([#&#8203;4956])

##### Internal changes

-   rt: extract `basic_scheduler::Config` ([#&#8203;4935])
-   rt: move I/O driver into `runtime` module ([#&#8203;4942])
-   rt: rename internal scheduler types ([#&#8203;4945])

##### Documented

- chore: fix typos and grammar ([#&#8203;4858], [#&#8203;4894],
[#&#8203;4928])
-   io: fix typo in `AsyncSeekExt::rewind` docs ([#&#8203;4893])
- net: add documentation to `try_read()` for zero-length buffers
([#&#8203;4937])
- runtime: remove incorrect panic section for `Builder::worker_threads`
([#&#8203;4849])
-   sync: doc of `watch::Sender::send` improved ([#&#8203;4959])
-   task: add cancel safety docs to `JoinHandle` ([#&#8203;4901])
-   task: expand on cancellation of `spawn_blocking` ([#&#8203;4811])
- time: clarify that the first tick of `Interval::tick` happens
immediately ([#&#8203;4951])

##### Unstable

-   rt: add unstable option to disable the LIFO slot ([#&#8203;4936])
- task: fix incorrect signature in `Builder::spawn_on` ([#&#8203;4953])
-   task: make `task::Builder::spawn*` methods fallible ([#&#8203;4823])

[#&#8203;4595]: https://togithub.com/tokio-rs/tokio/pull/4595

[#&#8203;4716]: https://togithub.com/tokio-rs/tokio/pull/4716

[#&#8203;4765]: https://togithub.com/tokio-rs/tokio/pull/4765

[#&#8203;4805]: https://togithub.com/tokio-rs/tokio/pull/4805

[#&#8203;4811]: https://togithub.com/tokio-rs/tokio/pull/4811

[#&#8203;4823]: https://togithub.com/tokio-rs/tokio/pull/4823

[#&#8203;4824]: https://togithub.com/tokio-rs/tokio/pull/4824

[#&#8203;4837]: https://togithub.com/tokio-rs/tokio/pull/4837

[#&#8203;4840]: https://togithub.com/tokio-rs/tokio/pull/4840

[#&#8203;4841]: https://togithub.com/tokio-rs/tokio/pull/4841

[#&#8203;4845]: https://togithub.com/tokio-rs/tokio/pull/4845

[#&#8203;4848]: https://togithub.com/tokio-rs/tokio/pull/4848

[#&#8203;4849]: https://togithub.com/tokio-rs/tokio/pull/4849

[#&#8203;4852]: https://togithub.com/tokio-rs/tokio/pull/4852

[#&#8203;4858]: https://togithub.com/tokio-rs/tokio/pull/4858

[#&#8203;4867]: https://togithub.com/tokio-rs/tokio/pull/4867

[#&#8203;4877]: https://togithub.com/tokio-rs/tokio/pull/4877

[#&#8203;4882]: https://togithub.com/tokio-rs/tokio/pull/4882

[#&#8203;4886]: https://togithub.com/tokio-rs/tokio/pull/4886

[#&#8203;4893]: https://togithub.com/tokio-rs/tokio/pull/4893

[#&#8203;4894]: https://togithub.com/tokio-rs/tokio/pull/4894

[#&#8203;4897]: https://togithub.com/tokio-rs/tokio/pull/4897

[#&#8203;4898]: https://togithub.com/tokio-rs/tokio/pull/4898

[#&#8203;4901]: https://togithub.com/tokio-rs/tokio/pull/4901

[#&#8203;4904]: https://togithub.com/tokio-rs/tokio/pull/4904

[#&#8203;4920]: https://togithub.com/tokio-rs/tokio/pull/4920

[#&#8203;4924]: https://togithub.com/tokio-rs/tokio/pull/4924

[#&#8203;4928]: https://togithub.com/tokio-rs/tokio/pull/4928

[#&#8203;4935]: https://togithub.com/tokio-rs/tokio/pull/4935

[#&#8203;4936]: https://togithub.com/tokio-rs/tokio/pull/4936

[#&#8203;4937]: https://togithub.com/tokio-rs/tokio/pull/4937

[#&#8203;4942]: https://togithub.com/tokio-rs/tokio/pull/4942

[#&#8203;4945]: https://togithub.com/tokio-rs/tokio/pull/4945

[#&#8203;4951]: https://togithub.com/tokio-rs/tokio/pull/4951

[#&#8203;4953]: https://togithub.com/tokio-rs/tokio/pull/4953

[#&#8203;4956]: https://togithub.com/tokio-rs/tokio/pull/4956

[#&#8203;4959]: https://togithub.com/tokio-rs/tokio/pull/4959

###
[`v1.20.6`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.20.6):
Tokio v1.20.6

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.5...tokio-1.20.6)

### 1.20.6 (September 22, 2023)

This is a backport of a change from 1.27.0.

##### Changed

-   io: use `memchr` from `libc` ([#&#8203;5960])

[#&#8203;5960]: https://togithub.com/tokio-rs/tokio/pull/5960

###
[`v1.20.5`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.20.5):
Tokio v1.20.5

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.4...tokio-1.20.5)

### 1.20.5 (May 28, 2023)

Forward ports 1.18.6 changes.

##### Fixed

-   deps: disable default features for mio ([#&#8203;5728])

[#&#8203;5728]: https://togithub.com/tokio-rs/tokio/pull/5728

###
[`v1.20.4`](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.3...tokio-1.20.4)

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.3...tokio-1.20.4)

###
[`v1.20.3`](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.2...tokio-1.20.3)

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.2...tokio-1.20.3)

###
[`v1.20.2`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.20.2):
Tokio v1.20.2

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.1...tokio-1.20.2)

### 1.20.2 (September 27, 2022)

This release removes the dependency on the `once_cell` crate to restore
the MSRV of the 1.20.x LTS release. ([#&#8203;5048])

[#&#8203;5048]: https://togithub.com/tokio-rs/tokio/pull/5048

###
[`v1.20.1`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.20.1):
Tokio v1.20.1

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.20.0...tokio-1.20.1)

### 1.20.1 (July 25, 2022)

##### Fixed

-   chore: fix version detection in build script ([#&#8203;4860])

[#&#8203;4860]: https://togithub.com/tokio-rs/tokio/pull/4860

###
[`v1.20.0`](https://togithub.com/tokio-rs/tokio/releases/tag/tokio-1.20.0):
Tokio v1.20.0

[Compare
Source](https://togithub.com/tokio-rs/tokio/compare/tokio-1.19.2...tokio-1.20.0)

### 1.20.0 (July 12, 2022)

##### Added

- tokio: add track_caller to public APIs ([#&#8203;4772],
[#&#8203;4791], [#&#8203;4793], [#&#8203;4806], [#&#8203;4808])
-   sync: Add `has_changed` method to `watch::Ref` ([#&#8203;4758])

##### Changed

-   time: remove `src/time/driver/wheel/stack.rs` ([#&#8203;4766])
-   rt: clean up arguments passed to basic scheduler ([#&#8203;4767])
-   net: be more specific about winapi features ([#&#8203;4764])
- tokio: use const initialized thread locals where possible
([#&#8203;4677])
-   task: various small improvements to LocalKey ([#&#8203;4795])

##### Fixed

##### Documented

-   fs: warn about performance pitfall ([#&#8203;4762])
-   chore: fix spelling ([#&#8203;4769])
-   sync: document spurious failures in oneshot ([#&#8203;4777])
-   sync: add warning for watch in non-Send futures ([#&#8203;4741])
-   chore: fix typo ([#&#8203;4798])

##### Unstable

-   joinset: rename `join_one` to `join_next` ([#&#8203;4755])
-   rt: unhandled panic conf

</details>

---

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🔕 **Ignore**: Close this PR and you won't be reminded about these
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---

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---

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