sync: document drop behavior for channels #5497
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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
satakuma
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Feb 23, 2023
Co-authored-by: Tymoteusz Wiśniewski <[email protected]>
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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
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# 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
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# 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
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# 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
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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` ([#​6411])
- io: add `try_new` and `try_with_interest` to `AsyncFd`
([#​6345])
- sync: add `forget_permits` method to semaphore ([#​6331])
- sync: add `is_closed`, `is_empty`, and `len` to mpsc receivers
([#​6348])
- sync: add a `rwlock()` method to owned `RwLock` guards
([#​6418])
- sync: expose strong and weak counts of mpsc sender handles
([#​6405])
- sync: implement `Clone` for `watch::Sender` ([#​6388])
- task: add `TaskLocalFuture::take_value` ([#​6340])
- task: implement `FromIterator` for `JoinSet` ([#​6300])
##### Changed
- io: make `io::split` use a mutex instead of a spinlock
([#​6403])
##### Fixed
- docs: fix docsrs build without net feature ([#​6360])
- macros: allow select with only else branch ([#​6339])
- runtime: fix leaking registration entries when os registration fails
([#​6329])
##### Documented
- io: document cancel safety of `AsyncBufReadExt::fill_buf`
([#​6431])
- io: document cancel safety of `AsyncReadExt`'s primitive read
functions ([#​6337])
- runtime: add doc link from `Runtime` to `#[tokio::main]`
([#​6366])
- runtime: make the `enter` example deterministic ([#​6351])
- sync: add Semaphore example for limiting the number of outgoing
requests ([#​6419])
- sync: fix missing period in broadcast docs ([#​6377])
- sync: mark `mpsc::Sender::downgrade` with `#[must_use]`
([#​6326])
- sync: reorder `const_new` before `new_with` ([#​6392])
- sync: update watch channel docs ([#​6395])
- task: fix documentation links ([#​6336])
##### Changed (unstable)
- runtime: include task `Id` in taskdumps ([#​6328])
- runtime: panic if `unhandled_panic` is enabled when not supported
([#​6410])
[#​6300]: https://togithub.com/tokio-rs/tokio/pull/6300
[#​6326]: https://togithub.com/tokio-rs/tokio/pull/6326
[#​6328]: https://togithub.com/tokio-rs/tokio/pull/6328
[#​6329]: https://togithub.com/tokio-rs/tokio/pull/6329
[#​6331]: https://togithub.com/tokio-rs/tokio/pull/6331
[#​6336]: https://togithub.com/tokio-rs/tokio/pull/6336
[#​6337]: https://togithub.com/tokio-rs/tokio/pull/6337
[#​6339]: https://togithub.com/tokio-rs/tokio/pull/6339
[#​6340]: https://togithub.com/tokio-rs/tokio/pull/6340
[#​6345]: https://togithub.com/tokio-rs/tokio/pull/6345
[#​6348]: https://togithub.com/tokio-rs/tokio/pull/6348
[#​6351]: https://togithub.com/tokio-rs/tokio/pull/6351
[#​6360]: https://togithub.com/tokio-rs/tokio/pull/6360
[#​6366]: https://togithub.com/tokio-rs/tokio/pull/6366
[#​6377]: https://togithub.com/tokio-rs/tokio/pull/6377
[#​6388]: https://togithub.com/tokio-rs/tokio/pull/6388
[#​6392]: https://togithub.com/tokio-rs/tokio/pull/6392
[#​6395]: https://togithub.com/tokio-rs/tokio/pull/6395
[#​6403]: https://togithub.com/tokio-rs/tokio/pull/6403
[#​6405]: https://togithub.com/tokio-rs/tokio/pull/6405
[#​6410]: https://togithub.com/tokio-rs/tokio/pull/6410
[#​6411]: https://togithub.com/tokio-rs/tokio/pull/6411
[#​6418]: https://togithub.com/tokio-rs/tokio/pull/6418
[#​6419]: https://togithub.com/tokio-rs/tokio/pull/6419
[#​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` ([#​6220])
- io: implement `AsyncWrite` for `Empty` ([#​6235])
- net: add support for anonymous unix pipes ([#​6127])
- net: add `UnixSocket` ([#​6290])
- net: expose keepalive option on `TcpSocket` ([#​6311])
- sync: add `{Receiver,UnboundedReceiver}::poll_recv_many`
([#​6236])
- sync: add `Sender::{try_,}reserve_many` ([#​6205])
- sync: add `watch::Receiver::mark_unchanged` ([#​6252])
- task: add `JoinSet::try_join_next` ([#​6280])
##### Changed
- io: make `copy` cooperative ([#​6265])
- io: make `repeat` and `sink` cooperative ([#​6254])
- io: simplify check for empty slice ([#​6293])
- process: use pidfd on Linux when available ([#​6152])
- sync: use AtomicBool in broadcast channel future ([#​6298])
##### Documented
- io: clarify `clear_ready` docs ([#​6304])
- net: document that `*Fd` traits on `TcpSocket` are unix-only
([#​6294])
- sync: document FIFO behavior of `tokio::sync::Mutex` ([#​6279])
- chore: typographic improvements ([#​6262])
- runtime: remove obsolete comment ([#​6303])
- task: fix typo ([#​6261])
[#​6220]: https://togithub.com/tokio-rs/tokio/pull/6220
[#​6235]: https://togithub.com/tokio-rs/tokio/pull/6235
[#​6127]: https://togithub.com/tokio-rs/tokio/pull/6127
[#​6290]: https://togithub.com/tokio-rs/tokio/pull/6290
[#​6311]: https://togithub.com/tokio-rs/tokio/pull/6311
[#​6236]: https://togithub.com/tokio-rs/tokio/pull/6236
[#​6205]: https://togithub.com/tokio-rs/tokio/pull/6205
[#​6252]: https://togithub.com/tokio-rs/tokio/pull/6252
[#​6280]: https://togithub.com/tokio-rs/tokio/pull/6280
[#​6265]: https://togithub.com/tokio-rs/tokio/pull/6265
[#​6254]: https://togithub.com/tokio-rs/tokio/pull/6254
[#​6293]: https://togithub.com/tokio-rs/tokio/pull/6293
[#​6238]: https://togithub.com/tokio-rs/tokio/pull/6238
[#​6152]: https://togithub.com/tokio-rs/tokio/pull/6152
[#​6298]: https://togithub.com/tokio-rs/tokio/pull/6298
[#​6262]: https://togithub.com/tokio-rs/tokio/pull/6262
[#​6303]: https://togithub.com/tokio-rs/tokio/pull/6303
[#​6261]: https://togithub.com/tokio-rs/tokio/pull/6261
[#​6304]: https://togithub.com/tokio-rs/tokio/pull/6304
[#​6294]: https://togithub.com/tokio-rs/tokio/pull/6294
[#​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`
([#​6221])
[#​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 ([#​6176])
##### Changed
- io: drop the `Sized` requirements from `AsyncReadExt.read_buf`
([#​6169])
- runtime: make `Runtime` unwind safe ([#​6189])
- runtime: reduce the lock contention in task spawn ([#​6001])
- tokio: update nix dependency to 0.27.1 ([#​6190])
##### Fixed
- chore: make `--cfg docsrs` work without net feature ([#​6166])
- chore: use relaxed load for `unsync_load` on miri ([#​6179])
- runtime: handle missing context on wake ([#​6148])
- taskdump: fix taskdump cargo config example ([#​6150])
- taskdump: skip notified tasks during taskdumps ([#​6194])
- tracing: avoid creating resource spans with current parent, use a None
parent instead ([#​6107])
- tracing: make task span explicit root ([#​6158])
##### Documented
- io: flush in `AsyncWriteExt` examples ([#​6149])
- runtime: document fairness guarantees and current behavior
([#​6145])
- task: document cancel safety of `LocalSet::run_until` ([#​6147])
[#​6001]: https://togithub.com/tokio-rs/tokio/pull/6001
[#​6107]: https://togithub.com/tokio-rs/tokio/pull/6107
[#​6144]: https://togithub.com/tokio-rs/tokio/pull/6144
[#​6145]: https://togithub.com/tokio-rs/tokio/pull/6145
[#​6147]: https://togithub.com/tokio-rs/tokio/pull/6147
[#​6148]: https://togithub.com/tokio-rs/tokio/pull/6148
[#​6149]: https://togithub.com/tokio-rs/tokio/pull/6149
[#​6150]: https://togithub.com/tokio-rs/tokio/pull/6150
[#​6158]: https://togithub.com/tokio-rs/tokio/pull/6158
[#​6166]: https://togithub.com/tokio-rs/tokio/pull/6166
[#​6169]: https://togithub.com/tokio-rs/tokio/pull/6169
[#​6176]: https://togithub.com/tokio-rs/tokio/pull/6176
[#​6179]: https://togithub.com/tokio-rs/tokio/pull/6179
[#​6189]: https://togithub.com/tokio-rs/tokio/pull/6189
[#​6190]: https://togithub.com/tokio-rs/tokio/pull/6190
[#​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 ([#​6067])
- io: fix integer overflow in `take` ([#​6080])
- io: fix I/O resource hang ([#​6134])
- sync: fix `broadcast::channel` link ([#​6100])
##### Changed
- macros: use `::core` qualified imports instead of `::std` inside
`tokio::test` macro ([#​5973])
##### Added
- fs: update cfg attr in `fs::read_dir` to include `aix`
([#​6075])
- sync: add `mpsc::Receiver::recv_many` ([#​6010])
- tokio: added vita target support ([#​6094])
[#​5973]: https://togithub.com/tokio-rs/tokio/pull/5973
[#​6067]: https://togithub.com/tokio-rs/tokio/pull/6067
[#​6080]: https://togithub.com/tokio-rs/tokio/pull/6080
[#​6134]: https://togithub.com/tokio-rs/tokio/pull/6134
[#​6100]: https://togithub.com/tokio-rs/tokio/pull/6100
[#​6075]: https://togithub.com/tokio-rs/tokio/pull/6075
[#​6010]: https://togithub.com/tokio-rs/tokio/pull/6010
[#​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]` ([#​6037])
- runtime: fix cache line size for RISC-V ([#​5994])
- sync: prevent lock poisoning in `watch::Receiver::wait_for`
([#​6021])
- task: fix `spawn_local` source location ([#​5984])
##### Changed
- sync: use Acquire/Release orderings instead of SeqCst in `watch`
([#​6018])
##### Added
- fs: add vectored writes to `tokio::fs::File` ([#​5958])
- io: add `Interest::remove` method ([#​5906])
- io: add vectored writes to `DuplexStream` ([#​5985])
- net: add Apple tvOS support ([#​6045])
- sync: add `?Sized` bound to `{MutexGuard,OwnedMutexGuard}::map`
([#​5997])
- sync: add `watch::Receiver::mark_unseen` ([#​5962],
[#​6014], [#​6017])
- sync: add `watch::Sender::new` ([#​5998])
- sync: add const fn `OnceCell::from_value` ([#​5903])
##### Removed
- remove unused `stats` feature ([#​5952])
##### Documented
- add missing backticks in code examples ([#​5938],
[#​6056])
- fix typos ([#​5988], [#​6030])
- process: document that `Child::wait` is cancel safe ([#​5977])
- sync: add examples for `Semaphore` ([#​5939], [#​5956],
[#​5978], [#​6031], [#​6032], [#​6050])
- sync: document that `broadcast` capacity is a lower bound
([#​6042])
- sync: document that `const_new` is not instrumented ([#​6002])
- sync: improve cancel-safety documentation for `mpsc::Sender::send`
([#​5947])
- sync: improve docs for `watch` channel ([#​5954])
- taskdump: render taskdump documentation on docs.rs ([#​5972])
##### Unstable
- taskdump: fix potential deadlock ([#​6036])
[#​5903]: https://togithub.com/tokio-rs/tokio/pull/5903
[#​5906]: https://togithub.com/tokio-rs/tokio/pull/5906
[#​5938]: https://togithub.com/tokio-rs/tokio/pull/5938
[#​5939]: https://togithub.com/tokio-rs/tokio/pull/5939
[#​5947]: https://togithub.com/tokio-rs/tokio/pull/5947
[#​5952]: https://togithub.com/tokio-rs/tokio/pull/5952
[#​5954]: https://togithub.com/tokio-rs/tokio/pull/5954
[#​5956]: https://togithub.com/tokio-rs/tokio/pull/5956
[#​5958]: https://togithub.com/tokio-rs/tokio/pull/5958
[#​5960]: https://togithub.com/tokio-rs/tokio/pull/5960
[#​5962]: https://togithub.com/tokio-rs/tokio/pull/5962
[#​5971]: https://togithub.com/tokio-rs/tokio/pull/5971
[#​5972]: https://togithub.com/tokio-rs/tokio/pull/5972
[#​5977]: https://togithub.com/tokio-rs/tokio/pull/5977
[#​5978]: https://togithub.com/tokio-rs/tokio/pull/5978
[#​5984]: https://togithub.com/tokio-rs/tokio/pull/5984
[#​5985]: https://togithub.com/tokio-rs/tokio/pull/5985
[#​5988]: https://togithub.com/tokio-rs/tokio/pull/5988
[#​5994]: https://togithub.com/tokio-rs/tokio/pull/5994
[#​5997]: https://togithub.com/tokio-rs/tokio/pull/5997
[#​5998]: https://togithub.com/tokio-rs/tokio/pull/5998
[#​6002]: https://togithub.com/tokio-rs/tokio/pull/6002
[#​6014]: https://togithub.com/tokio-rs/tokio/pull/6014
[#​6017]: https://togithub.com/tokio-rs/tokio/pull/6017
[#​6018]: https://togithub.com/tokio-rs/tokio/pull/6018
[#​6021]: https://togithub.com/tokio-rs/tokio/pull/6021
[#​6030]: https://togithub.com/tokio-rs/tokio/pull/6030
[#​6031]: https://togithub.com/tokio-rs/tokio/pull/6031
[#​6032]: https://togithub.com/tokio-rs/tokio/pull/6032
[#​6036]: https://togithub.com/tokio-rs/tokio/pull/6036
[#​6037]: https://togithub.com/tokio-rs/tokio/pull/6037
[#​6042]: https://togithub.com/tokio-rs/tokio/pull/6042
[#​6045]: https://togithub.com/tokio-rs/tokio/pull/6045
[#​6050]: https://togithub.com/tokio-rs/tokio/pull/6050
[#​6056]: https://togithub.com/tokio-rs/tokio/pull/6056
[#​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`
([#​6221])
[#​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`
([#​5925])
##### Added
- process: stabilize `Command::raw_arg` ([#​5930])
- io: enable awaiting error readiness ([#​5781])
##### Unstable
- rt(alt): improve the scalability of alt runtime as the number of cores
grows ([#​5935])
[#​5925]: https://togithub.com/tokio-rs/tokio/pull/5925
[#​5930]: https://togithub.com/tokio-rs/tokio/pull/5930
[#​5781]: https://togithub.com/tokio-rs/tokio/pull/5781
[#​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` ([#​5914])
##### Unstable
- rt(unstable): fix memory leak in unstable next-gen scheduler prototype
([#​5911])
- rt: expose mean task poll time metric ([#​5927])
[#​5914]: https://togithub.com/tokio-rs/tokio/pull/5914
[#​5911]: https://togithub.com/tokio-rs/tokio/pull/5911
[#​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. ([#​5887])
##### Changed
- tokio: reduce LLVM code generation ([#​5859])
- io: support `--cfg mio_unsupported_force_poll_poll` flag
([#​5881])
- sync: make `const_new` methods always available ([#​5885])
- sync: avoid false sharing in mpsc channel ([#​5829])
- rt: pop at least one task from inject queue ([#​5908])
##### Added
- sync: add `broadcast::Sender::new` ([#​5824])
- net: implement `UCred` for espidf ([#​5868])
- fs: add `File::options()` ([#​5869])
- time: implement extra reset variants for `Interval` ([#​5878])
- process: add `{ChildStd*}::into_owned_{fd, handle}` ([#​5899])
##### Removed
- tokio: removed unused `tokio_*` cfgs ([#​5890])
- remove build script to speed up compilation ([#​5887])
##### Documented
- sync: mention lagging in docs for `broadcast::send` ([#​5820])
- runtime: expand on sharing runtime docs ([#​5858])
- io: use vec in example for `AsyncReadExt::read_exact` ([#​5863])
- time: mark `Sleep` as `!Unpin` in docs ([#​5916])
- process: fix `raw_arg` not showing up in docs ([#​5865])
##### Unstable
- rt: add runtime ID ([#​5864])
- rt: initial implementation of new threaded runtime ([#​5823])
[#​5820]: https://togithub.com/tokio-rs/tokio/pull/5820
[#​5823]: https://togithub.com/tokio-rs/tokio/pull/5823
[#​5824]: https://togithub.com/tokio-rs/tokio/pull/5824
[#​5829]: https://togithub.com/tokio-rs/tokio/pull/5829
[#​5858]: https://togithub.com/tokio-rs/tokio/pull/5858
[#​5859]: https://togithub.com/tokio-rs/tokio/pull/5859
[#​5863]: https://togithub.com/tokio-rs/tokio/pull/5863
[#​5864]: https://togithub.com/tokio-rs/tokio/pull/5864
[#​5865]: https://togithub.com/tokio-rs/tokio/pull/5865
[#​5868]: https://togithub.com/tokio-rs/tokio/pull/5868
[#​5869]: https://togithub.com/tokio-rs/tokio/pull/5869
[#​5878]: https://togithub.com/tokio-rs/tokio/pull/5878
[#​5881]: https://togithub.com/tokio-rs/tokio/pull/5881
[#​5885]: https://togithub.com/tokio-rs/tokio/pull/5885
[#​5887]: https://togithub.com/tokio-rs/tokio/pull/5887
[#​5890]: https://togithub.com/tokio-rs/tokio/pull/5890
[#​5899]: https://togithub.com/tokio-rs/tokio/pull/5899
[#​5908]: https://togithub.com/tokio-rs/tokio/pull/5908
[#​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
([#​5837])
[#​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` ([#​5766])
##### Fixed
- fs: reduce blocking ops in `fs::read_dir` ([#​5653])
- rt: fix possible starvation ([#​5686], [#​5712])
- rt: fix stacked borrows issue in `JoinSet` ([#​5693])
- rt: panic if `EnterGuard` dropped incorrect order ([#​5772])
- time: do not overflow to signal value ([#​5710])
- fs: wait for in-flight ops before cloning `File` ([#​5803])
##### Changed
- rt: reduce time to poll tasks scheduled from outside the runtime
([#​5705], [#​5720])
##### Added
- net: add uds doc alias for unix sockets ([#​5659])
- rt: add metric for number of tasks ([#​5628])
- sync: implement more traits for channel errors ([#​5666])
- net: add nodelay methods on TcpSocket ([#​5672])
- sync: add `broadcast::Receiver::blocking_recv` ([#​5690])
- process: add `raw_arg` method to `Command` ([#​5704])
- io: support PRIORITY epoll events ([#​5566])
- task: add `JoinSet::poll_join_next` ([#​5721])
- net: add support for Redox OS ([#​5790])
##### Unstable
- rt: add the ability to dump task backtraces ([#​5608],
[#​5676], [#​5708], [#​5717])
- rt: instrument task poll times with a histogram ([#​5685])
[#​5766]: https://togithub.com/tokio-rs/tokio/pull/5766
[#​5653]: https://togithub.com/tokio-rs/tokio/pull/5653
[#​5686]: https://togithub.com/tokio-rs/tokio/pull/5686
[#​5712]: https://togithub.com/tokio-rs/tokio/pull/5712
[#​5693]: https://togithub.com/tokio-rs/tokio/pull/5693
[#​5772]: https://togithub.com/tokio-rs/tokio/pull/5772
[#​5710]: https://togithub.com/tokio-rs/tokio/pull/5710
[#​5803]: https://togithub.com/tokio-rs/tokio/pull/5803
[#​5705]: https://togithub.com/tokio-rs/tokio/pull/5705
[#​5720]: https://togithub.com/tokio-rs/tokio/pull/5720
[#​5659]: https://togithub.com/tokio-rs/tokio/pull/5659
[#​5628]: https://togithub.com/tokio-rs/tokio/pull/5628
[#​5666]: https://togithub.com/tokio-rs/tokio/pull/5666
[#​5672]: https://togithub.com/tokio-rs/tokio/pull/5672
[#​5690]: https://togithub.com/tokio-rs/tokio/pull/5690
[#​5704]: https://togithub.com/tokio-rs/tokio/pull/5704
[#​5566]: https://togithub.com/tokio-rs/tokio/pull/5566
[#​5721]: https://togithub.com/tokio-rs/tokio/pull/5721
[#​5790]: https://togithub.com/tokio-rs/tokio/pull/5790
[#​5608]: https://togithub.com/tokio-rs/tokio/pull/5608
[#​5676]: https://togithub.com/tokio-rs/tokio/pull/5676
[#​5708]: https://togithub.com/tokio-rs/tokio/pull/5708
[#​5717]: https://togithub.com/tokio-rs/tokio/pull/5717
[#​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 ([#​5728])
[#​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. ([#​5677])
[#​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` ([#​5542])
- io: impl BufMut for ReadBuf ([#​5590])
- net: add `recv_buf` for `UdpSocket` and `UnixDatagram`
([#​5583])
- sync: add `OwnedSemaphorePermit::semaphore` ([#​5618])
- sync: add `same_channel` to broadcast channel ([#​5607])
- sync: add `watch::Receiver::wait_for` ([#​5611])
- task: add `JoinSet::spawn_blocking` and `JoinSet::spawn_blocking_on`
([#​5612])
##### Changed
- deps: update windows-sys to 0.48 ([#​5591])
- io: make `read_to_end` not grow unnecessarily ([#​5610])
- macros: make entrypoints more efficient ([#​5621])
- sync: improve Debug impl for `RwLock` ([#​5647])
- sync: reduce contention in `Notify` ([#​5503])
##### Fixed
- net: support `get_peer_cred` on AIX ([#​5065])
- sync: avoid deadlocks in `broadcast` with custom wakers
([#​5578])
##### Documented
- sync: fix typo in `Semaphore::MAX_PERMITS` ([#​5645])
- sync: fix typo in `tokio::sync::watch::Sender` docs ([#​5587])
[#​5065]: https://togithub.com/tokio-rs/tokio/pull/5065
[#​5503]: https://togithub.com/tokio-rs/tokio/pull/5503
[#​5542]: https://togithub.com/tokio-rs/tokio/pull/5542
[#​5578]: https://togithub.com/tokio-rs/tokio/pull/5578
[#​5583]: https://togithub.com/tokio-rs/tokio/pull/5583
[#​5587]: https://togithub.com/tokio-rs/tokio/pull/5587
[#​5590]: https://togithub.com/tokio-rs/tokio/pull/5590
[#​5591]: https://togithub.com/tokio-rs/tokio/pull/5591
[#​5607]: https://togithub.com/tokio-rs/tokio/pull/5607
[#​5610]: https://togithub.com/tokio-rs/tokio/pull/5610
[#​5611]: https://togithub.com/tokio-rs/tokio/pull/5611
[#​5612]: https://togithub.com/tokio-rs/tokio/pull/5612
[#​5618]: https://togithub.com/tokio-rs/tokio/pull/5618
[#​5621]: https://togithub.com/tokio-rs/tokio/pull/5621
[#​5645]: https://togithub.com/tokio-rs/tokio/pull/5645
[#​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. ([#​5559])
##### Added
- io: add `async_io` helper method to sockets ([#​5512])
- io: add implementations of `AsFd`/`AsHandle`/`AsSocket`
([#​5514], [#​5540])
- net: add `UdpSocket::peek_sender()` ([#​5520])
- sync: add `RwLockWriteGuard::{downgrade_map, try_downgrade_map}`
([#​5527])
- task: add `JoinHandle::abort_handle` ([#​5543])
##### Changed
- io: use `memchr` from `libc` ([#​5558])
- macros: accept path as crate rename in `#[tokio::main]`
([#​5557])
- macros: update to syn 2.0.0 ([#​5572])
- time: don't register for a wakeup when `Interval` returns `Ready`
([#​5553])
##### Fixed
- fs: fuse std iterator in `ReadDir` ([#​5555])
- tracing: fix `spawn_blocking` location fields ([#​5573])
- time: clean up redundant check in `Wheel::poll()` ([#​5574])
##### Documented
- macros: define cancellation safety ([#​5525])
- io: add details to docs of `tokio::io::copy[_buf]` ([#​5575])
- io: refer to `ReaderStream` and `StreamReader` in module docs
([#​5576])
[#​5512]: https://togithub.com/tokio-rs/tokio/pull/5512
[#​5514]: https://togithub.com/tokio-rs/tokio/pull/5514
[#​5520]: https://togithub.com/tokio-rs/tokio/pull/5520
[#​5525]: https://togithub.com/tokio-rs/tokio/pull/5525
[#​5527]: https://togithub.com/tokio-rs/tokio/pull/5527
[#​5540]: https://togithub.com/tokio-rs/tokio/pull/5540
[#​5543]: https://togithub.com/tokio-rs/tokio/pull/5543
[#​5553]: https://togithub.com/tokio-rs/tokio/pull/5553
[#​5555]: https://togithub.com/tokio-rs/tokio/pull/5555
[#​5557]: https://togithub.com/tokio-rs/tokio/pull/5557
[#​5558]: https://togithub.com/tokio-rs/tokio/pull/5558
[#​5559]: https://togithub.com/tokio-rs/tokio/pull/5559
[#​5572]: https://togithub.com/tokio-rs/tokio/pull/5572
[#​5573]: https://togithub.com/tokio-rs/tokio/pull/5573
[#​5574]: https://togithub.com/tokio-rs/tokio/pull/5574
[#​5575]: https://togithub.com/tokio-rs/tokio/pull/5575
[#​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`
([#​6221])
[#​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` ([#​5960])
[#​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 ([#​5728])
[#​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 ([#​5330])
##### Added
- sync: add `broadcast::Sender::len` ([#​5343])
##### Changed
- fs: increase maximum read buffer size to 2MiB ([#​5397])
[#​5330]: https://togithub.com/tokio-rs/tokio/pull/5330
[#​5343]: https://togithub.com/tokio-rs/tokio/pull/5343
[#​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. ([#​5356])
[#​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
([#​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 ([#​5284])
##### Added
- rt: add configuration option for max number of I/O events polled from
the OS
per tick ([#​5186])
- rt: add an environment variable for configuring the default number of
worker
threads per runtime instance ([#​4250])
##### Changed
- sync: reduce MPSC channel stack usage ([#​5294])
- io: reduce lock contention in I/O operations ([#​5300])
- fs: speed up `read_dir()` by chunking operations ([#​5309])
- rt: use internal `ThreadId` implementation ([#​5329])
- test: don't auto-advance time when a `spawn_blocking` task is running
([#​5115])
[#​5186]: https://togithub.com/tokio-rs/tokio/pull/5186
[#​5294]: https://togithub.com/tokio-rs/tokio/pull/5294
[#​5284]: https://togithub.com/tokio-rs/tokio/pull/5284
[#​4250]: https://togithub.com/tokio-rs/tokio/pull/4250
[#​5300]: https://togithub.com/tokio-rs/tokio/pull/5300
[#​5329]: https://togithub.com/tokio-rs/tokio/pull/5329
[#​5115]: https://togithub.com/tokio-rs/tokio/pull/5115
[#​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 ([#​5336]).
[#​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 ([#​5208])
- io: support vectored writes for `ChildStdin` ([#​5216])
- io: fix `async fn ready()` false positive for OS-specific events
([#​5231])
##### Changed
- runtime: `yield_now` defers task until after driver poll
([#​5223])
- runtime: reduce amount of codegen needed per spawned task
([#​5213])
- windows: replace `winapi` dependency with `windows-sys`
([#​5204])
[#​5208]: https://togithub.com/tokio-rs/tokio/pull/5208
[#​5216]: https://togithub.com/tokio-rs/tokio/pull/5216
[#​5213]: https://togithub.com/tokio-rs/tokio/pull/5213
[#​5204]: https://togithub.com/tokio-rs/tokio/pull/5204
[#​5223]: https://togithub.com/tokio-rs/tokio/pull/5223
[#​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` ([#​5138])
- sync: add `Mutex::blocking_lock_owned` ([#​5130])
- sync: add `Semaphore::MAX_PERMITS` ([#​5144])
- sync: add `merge()` to semaphore permits ([#​4948])
- sync: add `mpsc::WeakUnboundedSender` ([#​5189])
##### Added (unstable)
- process: add `Command::process_group` ([#​5114])
- runtime: export metrics about the blocking thread pool
([#​5161])
- task: add `task::id()` and `task::try_id()` ([#​5171])
##### Fixed
- macros: don't take ownership of futures in macros ([#​5087])
- runtime: fix Stacked Borrows violation in `LocalOwnedTasks`
([#​5099])
- runtime: mitigate ABA with 32-bit queue indices when possible
([#​5042])
- task: wake local tasks to the local queue when woken by the same
thread ([#​5095])
- time: panic in release mode when `mark_pending` called illegally
([#​5093])
- runtime: fix typo in expect message ([#​5169])
- runtime: fix `unsync_load` on atomic types ([#​5175])
- task: elaborate safety comments in task deallocation ([#​5172])
- runtime: fix `LocalSet` drop in thread local ([#​5179])
- net: remove libc type leakage in a public API ([#​5191])
- runtime: update the alignment of `CachePadded` ([#​5106])
##### Changed
- io: make `tokio::io::copy` continue filling the buffer when writer
stalls ([#​5066])
- runtime: remove `coop::budget` from `LocalSet::run_until`
([#​5155])
- sync: make `Notify` panic safe ([#​5154])
##### Documented
- io: fix doc for `write_i8` to use signed integers ([#​5040])
- net: fix doc typos for TCP and UDP `set_tos` methods ([#​5073])
- net: fix function name in `UdpSocket::recv` documentation
([#​5150])
- sync: typo in `TryLockError` for `RwLock::try_write` ([#​5160])
- task: document that spawned tasks execute immediately ([#​5117])
- time: document return type of `timeout` ([#​5118])
- time: document that `timeout` checks only before poll ([#​5126])
- sync: specify return type of `oneshot::Receiver` in docs
([#​5198])
##### Internal changes
- runtime: use const `Mutex::new` for globals ([#​5061])
- runtime: remove `Option` around `mio::Events` in io driver
([#​5078])
- runtime: remove a conditional compilation clause ([#​5104])
- runtime: remove a reference to internal time handle ([#​5107])
- runtime: misc time driver cleanup ([#​5120])
- runtime: move signal driver to runtime module ([#​5121])
- runtime: signal driver now uses I/O driver directly ([#​5125])
- runtime: start decoupling I/O driver and I/O handle ([#​5127])
- runtime: switch `io::handle` refs with scheduler:Handle
([#​5128])
- runtime: remove Arc from I/O driver ([#​5134])
- runtime: use signal driver handle via `scheduler::Handle`
([#​5135])
- runtime: move internal clock fns out of context ([#​5139])
- runtime: remove `runtime::context` module ([#​5140])
- runtime: keep driver cfgs in `driver.rs` ([#​5141])
- runtime: add `runtime::context` to unify thread-locals
([#​5143])
- runtime: rename some confusing internal variables/fns ([#​5151])
- runtime: move `coop` mod into `runtime` ([#​5152])
- runtime: move budget state to context thread-local ([#​5157])
- runtime: move park logic into runtime module ([#​5158])
- runtime: move `Runtime` into its own file ([#​5159])
- runtime: unify entering a runtime with `Handle::enter`
([#​5163])
- runtime: remove handle reference from each scheduler ([#​5166])
- runtime: move `enter` into `context` ([#​5167])
- runtime: combine context and entered thread-locals ([#​5168])
- runtime: fix accidental unsetting of current handle ([#​5178])
- runtime: move `CoreStage` methods to `Core` ([#​5182])
- sync: name mpsc semaphore types ([#​5146])
[#​4948]: https://togithub.com/tokio-rs/tokio/pull/4948
[#​5040]: https://togithub.com/tokio-rs/tokio/pull/5040
[#​5042]: https://togithub.com/tokio-rs/tokio/pull/5042
[#​5061]: https://togithub.com/tokio-rs/tokio/pull/5061
[#​5066]: https://togithub.com/tokio-rs/tokio/pull/5066
[#​5073]: https://togithub.com/tokio-rs/tokio/pull/5073
[#​5078]: https://togithub.com/tokio-rs/tokio/pull/5078
[#​5087]: https://togithub.com/tokio-rs/tokio/pull/5087
[#​5093]: https://togithub.com/tokio-rs/tokio/pull/5093
[#​5095]: https://togithub.com/tokio-rs/tokio/pull/5095
[#​5099]: https://togithub.com/tokio-rs/tokio/pull/5099
[#​5104]: https://togithub.com/tokio-rs/tokio/pull/5104
[#​5106]: https://togithub.com/tokio-rs/tokio/pull/5106
[#​5107]: https://togithub.com/tokio-rs/tokio/pull/5107
[#​5114]: https://togithub.com/tokio-rs/tokio/pull/5114
[#​5117]: https://togithub.com/tokio-rs/tokio/pull/5117
[#​5118]: https://togithub.com/tokio-rs/tokio/pull/5118
[#​5120]: https://togithub.com/tokio-rs/tokio/pull/5120
[#​5121]: https://togithub.com/tokio-rs/tokio/pull/5121
[#​5125]: https://togithub.com/tokio-rs/tokio/pull/5125
[#​5126]: https://togithub.com/tokio-rs/tokio/pull/5126
[#​5127]: https://togithub.com/tokio-rs/tokio/pull/5127
[#​5128]: https://togithub.com/tokio-rs/tokio/pull/5128
[#​5130]: https://togithub.com/tokio-rs/tokio/pull/5130
[#​5134]: https://togithub.com/tokio-rs/tokio/pull/5134
[#​5135]: https://togithub.com/tokio-rs/tokio/pull/5135
[#​5138]: https://togithub.com/tokio-rs/tokio/pull/5138
[#​5138]: https://togithub.com/tokio-rs/tokio/pull/5138
[#​5139]: https://togithub.com/tokio-rs/tokio/pull/5139
[#​5140]: https://togithub.com/tokio-rs/tokio/pull/5140
[#​5141]: https://togithub.com/tokio-rs/tokio/pull/5141
[#​5143]: https://togithub.com/tokio-rs/tokio/pull/5143
[#​5144]: https://togithub.com/tokio-rs/tokio/pull/5144
[#​5144]: https://togithub.com/tokio-rs/tokio/pull/5144
[#​5146]: https://togithub.com/tokio-rs/tokio/pull/5146
[#​5150]: https://togithub.com/tokio-rs/tokio/pull/5150
[#​5151]: https://togithub.com/tokio-rs/tokio/pull/5151
[#​5152]: https://togithub.com/tokio-rs/tokio/pull/5152
[#​5154]: https://togithub.com/tokio-rs/tokio/pull/5154
[#​5155]: https://togithub.com/tokio-rs/tokio/pull/5155
[#​5157]: https://togithub.com/tokio-rs/tokio/pull/5157
[#​5158]: https://togithub.com/tokio-rs/tokio/pull/5158
[#​5159]: https://togithub.com/tokio-rs/tokio/pull/5159
[#​5160]: https://togithub.com/tokio-rs/tokio/pull/5160
[#​5161]: https://togithub.com/tokio-rs/tokio/pull/5161
[#​5163]: https://togithub.com/tokio-rs/tokio/pull/5163
[#​5166]: https://togithub.com/tokio-rs/tokio/pull/5166
[#​5167]: https://togithub.com/tokio-rs/tokio/pull/5167
[#​5168]: https://togithub.com/tokio-rs/tokio/pull/5168
[#​5169]: https://togithub.com/tokio-rs/tokio/pull/5169
[#​5171]: https://togithub.com/tokio-rs/tokio/pull/5171
[#​5172]: https://togithub.com/tokio-rs/tokio/pull/5172
[#​5175]: https://togithub.com/tokio-rs/tokio/pull/5175
[#​5178]: https://togithub.com/tokio-rs/tokio/pull/5178
[#​5179]: https://togithub.com/tokio-rs/tokio/pull/5179
[#​5182]: https://togithub.com/tokio-rs/tokio/pull/5182
[#​5189]: https://togithub.com/tokio-rs/tokio/pull/5189
[#​5191]: https://togithub.com/tokio-rs/tokio/pull/5191
[#​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. ([#​5048])
[#​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 ([#​5000])
- task: ignore failure to set TLS in `LocalSet` Drop ([#​4976])
[#​4976]: https://togithub.com/tokio-rs/tokio/pull/4976
[#​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
([#​4882])
- net: add `tos` and `set_tos` methods to TCP and UDP sockets
([#​4877])
- net: add security flags to named pipe `ServerOptions` ([#​4845])
- signal: add more windows signal handlers ([#​4924])
- sync: add `mpsc::Sender::max_capacity` method ([#​4904])
- sync: implement Weak version of `mpsc::Sender` ([#​4595])
- task: add `LocalSet::enter` ([#​4765])
- task: stabilize `JoinSet` and `AbortHandle` ([#​4920])
- tokio: add `track_caller` to public APIs ([#​4805],
[#​4848], [#​4852])
- wasm: initial support for `wasm32-wasi` target ([#​4716])
##### Fixed
- miri: improve miri compatibility by avoiding temporary references in
`linked_list::Link` impls ([#​4841])
- signal: don't register write interest on signal pipe ([#​4898])
- sync: add `#[must_use]` to lock guards ([#​4886])
- sync: fix hang when calling `recv` on closed and reopened broadcast
channel ([#​4867])
- task: propagate attributes on task-locals ([#​4837])
##### Changed
- fs: change panic to error in `File::start_seek` ([#​4897])
- io: reduce syscalls in `poll_read` ([#​4840])
- process: use blocking threadpool for child stdio I/O ([#​4824])
- signal: make `SignalKind` methods const ([#​4956])
##### Internal changes
- rt: extract `basic_scheduler::Config` ([#​4935])
- rt: move I/O driver into `runtime` module ([#​4942])
- rt: rename internal scheduler types ([#​4945])
##### Documented
- chore: fix typos and grammar ([#​4858], [#​4894],
[#​4928])
- io: fix typo in `AsyncSeekExt::rewind` docs ([#​4893])
- net: add documentation to `try_read()` for zero-length buffers
([#​4937])
- runtime: remove incorrect panic section for `Builder::worker_threads`
([#​4849])
- sync: doc of `watch::Sender::send` improved ([#​4959])
- task: add cancel safety docs to `JoinHandle` ([#​4901])
- task: expand on cancellation of `spawn_blocking` ([#​4811])
- time: clarify that the first tick of `Interval::tick` happens
immediately ([#​4951])
##### Unstable
- rt: add unstable option to disable the LIFO slot ([#​4936])
- task: fix incorrect signature in `Builder::spawn_on` ([#​4953])
- task: make `task::Builder::spawn*` methods fallible ([#​4823])
[#​4595]: https://togithub.com/tokio-rs/tokio/pull/4595
[#​4716]: https://togithub.com/tokio-rs/tokio/pull/4716
[#​4765]: https://togithub.com/tokio-rs/tokio/pull/4765
[#​4805]: https://togithub.com/tokio-rs/tokio/pull/4805
[#​4811]: https://togithub.com/tokio-rs/tokio/pull/4811
[#​4823]: https://togithub.com/tokio-rs/tokio/pull/4823
[#​4824]: https://togithub.com/tokio-rs/tokio/pull/4824
[#​4837]: https://togithub.com/tokio-rs/tokio/pull/4837
[#​4840]: https://togithub.com/tokio-rs/tokio/pull/4840
[#​4841]: https://togithub.com/tokio-rs/tokio/pull/4841
[#​4845]: https://togithub.com/tokio-rs/tokio/pull/4845
[#​4848]: https://togithub.com/tokio-rs/tokio/pull/4848
[#​4849]: https://togithub.com/tokio-rs/tokio/pull/4849
[#​4852]: https://togithub.com/tokio-rs/tokio/pull/4852
[#​4858]: https://togithub.com/tokio-rs/tokio/pull/4858
[#​4867]: https://togithub.com/tokio-rs/tokio/pull/4867
[#​4877]: https://togithub.com/tokio-rs/tokio/pull/4877
[#​4882]: https://togithub.com/tokio-rs/tokio/pull/4882
[#​4886]: https://togithub.com/tokio-rs/tokio/pull/4886
[#​4893]: https://togithub.com/tokio-rs/tokio/pull/4893
[#​4894]: https://togithub.com/tokio-rs/tokio/pull/4894
[#​4897]: https://togithub.com/tokio-rs/tokio/pull/4897
[#​4898]: https://togithub.com/tokio-rs/tokio/pull/4898
[#​4901]: https://togithub.com/tokio-rs/tokio/pull/4901
[#​4904]: https://togithub.com/tokio-rs/tokio/pull/4904
[#​4920]: https://togithub.com/tokio-rs/tokio/pull/4920
[#​4924]: https://togithub.com/tokio-rs/tokio/pull/4924
[#​4928]: https://togithub.com/tokio-rs/tokio/pull/4928
[#​4935]: https://togithub.com/tokio-rs/tokio/pull/4935
[#​4936]: https://togithub.com/tokio-rs/tokio/pull/4936
[#​4937]: https://togithub.com/tokio-rs/tokio/pull/4937
[#​4942]: https://togithub.com/tokio-rs/tokio/pull/4942
[#​4945]: https://togithub.com/tokio-rs/tokio/pull/4945
[#​4951]: https://togithub.com/tokio-rs/tokio/pull/4951
[#​4953]: https://togithub.com/tokio-rs/tokio/pull/4953
[#​4956]: https://togithub.com/tokio-rs/tokio/pull/4956
[#​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` ([#​5960])
[#​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 ([#​5728])
[#​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. ([#​5048])
[#​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 ([#​4860])
[#​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 ([#​4772],
[#​4791], [#​4793], [#​4806], [#​4808])
- sync: Add `has_changed` method to `watch::Ref` ([#​4758])
##### Changed
- time: remove `src/time/driver/wheel/stack.rs` ([#​4766])
- rt: clean up arguments passed to basic scheduler ([#​4767])
- net: be more specific about winapi features ([#​4764])
- tokio: use const initialized thread locals where possible
([#​4677])
- task: various small improvements to LocalKey ([#​4795])
##### Fixed
##### Documented
- fs: warn about performance pitfall ([#​4762])
- chore: fix spelling ([#​4769])
- sync: document spurious failures in oneshot ([#​4777])
- sync: add warning for watch in non-Send futures ([#​4741])
- chore: fix typo ([#​4798])
##### Unstable
- joinset: rename `join_one` to `join_next` ([#​4755])
- rt: unhandled panic conf
</details>
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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