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Quelle CHANGELOG.md
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# 1.39.2 (July 27th, 2024)
This release fixes a regression where the `select!` macro stopped accepting
expressions that make use of temporary lifetime extension. ([#6722])
[#6722]: https://github.com/tokio-rs/tokio/pull/6722
# 1.39.1 (July 23rd, 2024)
This release reverts "time: avoid traversing entries in the time wheel twice"
because it contains a bug. ([#6715])
[#6715]: https://github.com/tokio-rs/tokio/pull/6715
# 1.39.0 (July 23rd, 2024)
Yanked. Please use 1.39.1 instead.
- This release bumps the MSRV to 1.70. ([#6645])
- This release upgrades to mio v1. ([#6635])
- This release upgrades to windows-sys v0.52 ([#6154])
### Added
- io: implement `AsyncSeek` for `Empty` ([#6663])
- metrics: stabilize `num_alive_tasks` ([#6619], [#6667])
- process: add `Command::as_std_mut` ([#6608])
- sync: add `watch::Sender::same_channel` ([#6637])
- sync: add `{Receiver,UnboundedReceiver}::{sender_strong_count,sender_weak_count}` ([#6661])
- sync: implement `Default` for `watch::Sender` ([#6626])
- task: implement `Clone` for `AbortHandle` ([#6621])
- task: stabilize `consume_budget` ([#6622])
### Changed
- io: improve panic message of `ReadBuf::put_slice()` ([#6629])
- io: read during write in `copy_bidirectional` and `copy` ([#6532])
- runtime: replace `num_cpus` with `available_parallelism` ([#6709])
- task: avoid stack overflow when passing large future to `block_on` ([#6692])
- time: avoid traversing entries in the time wheel twice ([#6584])
- time: support `IntoFuture` with `timeout` ([#6666])
- macros: support `IntoFuture` with `join!` and `select!` ([#6710])
### Fixed
- docs: fix docsrs builds with the fs feature enabled ([#6585])
- io: only use short-read optimization on known-to-be-compatible platforms ([#6668])
- time: fix overflow panic when using large durations with `Interval` ([#6612])
### Added (unstable)
- macros: allow `unhandled_panic` behavior for `#[tokio::main]` and `#[tokio::test]` ([#6593])
- metrics: add `spawned_tasks_count` ([#6114])
- metrics: add `worker_park_unpark_count` ([#6696])
- metrics: add worker thread id ([#6695])
### Documented
- io: update `tokio::io::stdout` documentation ([#6674])
- macros: typo fix in `join.rs` and `try_join.rs` ([#6641])
- runtime: fix typo in `unhandled_panic` ([#6660])
- task: document behavior of `JoinSet::try_join_next` when all tasks are running ([#6671])
[#6114]: https://github.com/tokio-rs/tokio/pull/6114
[#6154]: https://github.com/tokio-rs/tokio/pull/6154
[#6532]: https://github.com/tokio-rs/tokio/pull/6532
[#6584]: https://github.com/tokio-rs/tokio/pull/6584
[#6585]: https://github.com/tokio-rs/tokio/pull/6585
[#6593]: https://github.com/tokio-rs/tokio/pull/6593
[#6608]: https://github.com/tokio-rs/tokio/pull/6608
[#6612]: https://github.com/tokio-rs/tokio/pull/6612
[#6619]: https://github.com/tokio-rs/tokio/pull/6619
[#6621]: https://github.com/tokio-rs/tokio/pull/6621
[#6622]: https://github.com/tokio-rs/tokio/pull/6622
[#6626]: https://github.com/tokio-rs/tokio/pull/6626
[#6629]: https://github.com/tokio-rs/tokio/pull/6629
[#6635]: https://github.com/tokio-rs/tokio/pull/6635
[#6637]: https://github.com/tokio-rs/tokio/pull/6637
[#6641]: https://github.com/tokio-rs/tokio/pull/6641
[#6645]: https://github.com/tokio-rs/tokio/pull/6645
[#6660]: https://github.com/tokio-rs/tokio/pull/6660
[#6661]: https://github.com/tokio-rs/tokio/pull/6661
[#6663]: https://github.com/tokio-rs/tokio/pull/6663
[#6666]: https://github.com/tokio-rs/tokio/pull/6666
[#6667]: https://github.com/tokio-rs/tokio/pull/6667
[#6668]: https://github.com/tokio-rs/tokio/pull/6668
[#6671]: https://github.com/tokio-rs/tokio/pull/6671
[#6674]: https://github.com/tokio-rs/tokio/pull/6674
[#6692]: https://github.com/tokio-rs/tokio/pull/6692
[#6695]: https://github.com/tokio-rs/tokio/pull/6695
[#6696]: https://github.com/tokio-rs/tokio/pull/6696
[#6709]: https://github.com/tokio-rs/tokio/pull/6709
[#6710]: https://github.com/tokio-rs/tokio/pull/6710
# 1.38.1 (July 16th, 2024)
This release fixes the bug identified as ([#6682]), which caused timers not
to fire when they should.
### Fixed
- time: update `wake_up` while holding all the locks of sharded time wheels ([#6683])
[#6682]: https://github.com/tokio-rs/tokio/pull/6682
[#6683]: https://github.com/tokio-rs/tokio/pull/6683
# 1.38.0 (May 30th, 2024)
This release marks the beginning of stabilization for runtime metrics. It
stabilizes `RuntimeMetrics::worker_count`. Future releases will continue to
stabilize more metrics.
### Added
- fs: add `File::create_new` ([#6573])
- io: add `copy_bidirectional_with_sizes` ([#6500])
- io: implement `AsyncBufRead` for `Join` ([#6449])
- net: add Apple visionOS support ([#6465])
- net: implement `Clone` for `NamedPipeInfo` ([#6586])
- net: support QNX OS ([#6421])
- sync: add `Notify::notify_last` ([#6520])
- sync: add `mpsc::Receiver::{capacity,max_capacity}` ([#6511])
- sync: add `split` method to the semaphore permit ([#6472], [#6478])
- task: add `tokio::task::join_set::Builder::spawn_blocking` ([#6578])
- wasm: support rt-multi-thread with wasm32-wasi-preview1-threads ([#6510])
### Changed
- macros: make `#[tokio::test]` append `#[test]` at the end of the attribute list ([#6497])
- metrics: fix `blocking_threads` count ([#6551])
- metrics: stabilize `RuntimeMetrics::worker_count` ([#6556])
- runtime: move task out of the `lifo_slot` in `block_in_place` ([#6596])
- runtime: panic if `global_queue_interval` is zero ([#6445])
- sync: always drop message in destructor for oneshot receiver ([#6558])
- sync: instrument `Semaphore` for task dumps ([#6499])
- sync: use FIFO ordering when waking batches of wakers ([#6521])
- task: make `LocalKey::get` work with Clone types ([#6433])
- tests: update nix and mio-aio dev-dependencies ([#6552])
- time: clean up implementation ([#6517])
- time: lazily init timers on first poll ([#6512])
- time: remove the `true_when` field in `TimerShared` ([#6563])
- time: use sharding for timer implementation ([#6534])
### Fixed
- taskdump: allow building taskdump docs on non-unix machines ([#6564])
- time: check for overflow in `Interval::poll_tick` ([#6487])
- sync: fix incorrect `is_empty` on mpsc block boundaries ([#6603])
### Documented
- fs: rewrite file system docs ([#6467])
- io: fix `stdin` documentation ([#6581])
- io: fix obsolete reference in `ReadHalf::unsplit()` documentation ([#6498])
- macros: render more comprehensible documentation for `select!` ([#6468])
- net: add missing types to module docs ([#6482])
- net: fix misleading `NamedPipeServer` example ([#6590])
- sync: add examples for `SemaphorePermit`, `OwnedSemaphorePermit` ([#6477])
- sync: document that `Barrier::wait` is not cancel safe ([#6494])
- sync: explain relation between `watch::Sender::{subscribe,closed}` ([#6490])
- task: clarify that you can't abort `spawn_blocking` tasks ([#6571])
- task: fix a typo in doc of `LocalSet::run_until` ([#6599])
- time: fix test-util requirement for pause and resume in docs ([#6503])
[#6421]: https://github.com/tokio-rs/tokio/pull/6421
[#6433]: https://github.com/tokio-rs/tokio/pull/6433
[#6445]: https://github.com/tokio-rs/tokio/pull/6445
[#6449]: https://github.com/tokio-rs/tokio/pull/6449
[#6465]: https://github.com/tokio-rs/tokio/pull/6465
[#6467]: https://github.com/tokio-rs/tokio/pull/6467
[#6468]: https://github.com/tokio-rs/tokio/pull/6468
[#6472]: https://github.com/tokio-rs/tokio/pull/6472
[#6477]: https://github.com/tokio-rs/tokio/pull/6477
[#6478]: https://github.com/tokio-rs/tokio/pull/6478
[#6482]: https://github.com/tokio-rs/tokio/pull/6482
[#6487]: https://github.com/tokio-rs/tokio/pull/6487
[#6490]: https://github.com/tokio-rs/tokio/pull/6490
[#6494]: https://github.com/tokio-rs/tokio/pull/6494
[#6497]: https://github.com/tokio-rs/tokio/pull/6497
[#6498]: https://github.com/tokio-rs/tokio/pull/6498
[#6499]: https://github.com/tokio-rs/tokio/pull/6499
[#6500]: https://github.com/tokio-rs/tokio/pull/6500
[#6503]: https://github.com/tokio-rs/tokio/pull/6503
[#6510]: https://github.com/tokio-rs/tokio/pull/6510
[#6511]: https://github.com/tokio-rs/tokio/pull/6511
[#6512]: https://github.com/tokio-rs/tokio/pull/6512
[#6517]: https://github.com/tokio-rs/tokio/pull/6517
[#6520]: https://github.com/tokio-rs/tokio/pull/6520
[#6521]: https://github.com/tokio-rs/tokio/pull/6521
[#6534]: https://github.com/tokio-rs/tokio/pull/6534
[#6551]: https://github.com/tokio-rs/tokio/pull/6551
[#6552]: https://github.com/tokio-rs/tokio/pull/6552
[#6556]: https://github.com/tokio-rs/tokio/pull/6556
[#6558]: https://github.com/tokio-rs/tokio/pull/6558
[#6563]: https://github.com/tokio-rs/tokio/pull/6563
[#6564]: https://github.com/tokio-rs/tokio/pull/6564
[#6571]: https://github.com/tokio-rs/tokio/pull/6571
[#6573]: https://github.com/tokio-rs/tokio/pull/6573
[#6578]: https://github.com/tokio-rs/tokio/pull/6578
[#6581]: https://github.com/tokio-rs/tokio/pull/6581
[#6586]: https://github.com/tokio-rs/tokio/pull/6586
[#6590]: https://github.com/tokio-rs/tokio/pull/6590
[#6596]: https://github.com/tokio-rs/tokio/pull/6596
[#6599]: https://github.com/tokio-rs/tokio/pull/6599
[#6603]: https://github.com/tokio-rs/tokio/pull/6603
# 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://github.com/tokio-rs/tokio/pull/6300
[#6326]: https://github.com/tokio-rs/tokio/pull/6326
[#6328]: https://github.com/tokio-rs/tokio/pull/6328
[#6329]: https://github.com/tokio-rs/tokio/pull/6329
[#6331]: https://github.com/tokio-rs/tokio/pull/6331
[#6336]: https://github.com/tokio-rs/tokio/pull/6336
[#6337]: https://github.com/tokio-rs/tokio/pull/6337
[#6339]: https://github.com/tokio-rs/tokio/pull/6339
[#6340]: https://github.com/tokio-rs/tokio/pull/6340
[#6345]: https://github.com/tokio-rs/tokio/pull/6345
[#6348]: https://github.com/tokio-rs/tokio/pull/6348
[#6351]: https://github.com/tokio-rs/tokio/pull/6351
[#6360]: https://github.com/tokio-rs/tokio/pull/6360
[#6366]: https://github.com/tokio-rs/tokio/pull/6366
[#6377]: https://github.com/tokio-rs/tokio/pull/6377
[#6388]: https://github.com/tokio-rs/tokio/pull/6388
[#6392]: https://github.com/tokio-rs/tokio/pull/6392
[#6395]: https://github.com/tokio-rs/tokio/pull/6395
[#6403]: https://github.com/tokio-rs/tokio/pull/6403
[#6405]: https://github.com/tokio-rs/tokio/pull/6405
[#6410]: https://github.com/tokio-rs/tokio/pull/6410
[#6411]: https://github.com/tokio-rs/tokio/pull/6411
[#6418]: https://github.com/tokio-rs/tokio/pull/6418
[#6419]: https://github.com/tokio-rs/tokio/pull/6419
[#6431]: https://github.com/tokio-rs/tokio/pull/6431
# 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://github.com/tokio-rs/tokio/pull/6220
[#6235]: https://github.com/tokio-rs/tokio/pull/6235
[#6127]: https://github.com/tokio-rs/tokio/pull/6127
[#6290]: https://github.com/tokio-rs/tokio/pull/6290
[#6311]: https://github.com/tokio-rs/tokio/pull/6311
[#6236]: https://github.com/tokio-rs/tokio/pull/6236
[#6205]: https://github.com/tokio-rs/tokio/pull/6205
[#6252]: https://github.com/tokio-rs/tokio/pull/6252
[#6280]: https://github.com/tokio-rs/tokio/pull/6280
[#6265]: https://github.com/tokio-rs/tokio/pull/6265
[#6254]: https://github.com/tokio-rs/tokio/pull/6254
[#6293]: https://github.com/tokio-rs/tokio/pull/6293
[#6238]: https://github.com/tokio-rs/tokio/pull/6238
[#6152]: https://github.com/tokio-rs/tokio/pull/6152
[#6298]: https://github.com/tokio-rs/tokio/pull/6298
[#6262]: https://github.com/tokio-rs/tokio/pull/6262
[#6303]: https://github.com/tokio-rs/tokio/pull/6303
[#6261]: https://github.com/tokio-rs/tokio/pull/6261
[#6304]: https://github.com/tokio-rs/tokio/pull/6304
[#6294]: https://github.com/tokio-rs/tokio/pull/6294
[#6279]: https://github.com/tokio-rs/tokio/pull/6279
# 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://github.com/tokio-rs/tokio/pull/6221
# 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://github.com/tokio-rs/tokio/pull/6001
[#6107]: https://github.com/tokio-rs/tokio/pull/6107
[#6144]: https://github.com/tokio-rs/tokio/pull/6144
[#6145]: https://github.com/tokio-rs/tokio/pull/6145
[#6147]: https://github.com/tokio-rs/tokio/pull/6147
[#6148]: https://github.com/tokio-rs/tokio/pull/6148
[#6149]: https://github.com/tokio-rs/tokio/pull/6149
[#6150]: https://github.com/tokio-rs/tokio/pull/6150
[#6158]: https://github.com/tokio-rs/tokio/pull/6158
[#6166]: https://github.com/tokio-rs/tokio/pull/6166
[#6169]: https://github.com/tokio-rs/tokio/pull/6169
[#6176]: https://github.com/tokio-rs/tokio/pull/6176
[#6179]: https://github.com/tokio-rs/tokio/pull/6179
[#6189]: https://github.com/tokio-rs/tokio/pull/6189
[#6190]: https://github.com/tokio-rs/tokio/pull/6190
[#6194]: https://github.com/tokio-rs/tokio/pull/6194
# 1.34.0 (November 19th, 2023)
### 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://github.com/tokio-rs/tokio/pull/5973
[#6067]: https://github.com/tokio-rs/tokio/pull/6067
[#6080]: https://github.com/tokio-rs/tokio/pull/6080
[#6134]: https://github.com/tokio-rs/tokio/pull/6134
[#6100]: https://github.com/tokio-rs/tokio/pull/6100
[#6075]: https://github.com/tokio-rs/tokio/pull/6075
[#6010]: https://github.com/tokio-rs/tokio/pull/6010
[#6094]: https://github.com/tokio-rs/tokio/pull/6094
# 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://github.com/tokio-rs/tokio/pull/5903
[#5906]: https://github.com/tokio-rs/tokio/pull/5906
[#5938]: https://github.com/tokio-rs/tokio/pull/5938
[#5939]: https://github.com/tokio-rs/tokio/pull/5939
[#5947]: https://github.com/tokio-rs/tokio/pull/5947
[#5952]: https://github.com/tokio-rs/tokio/pull/5952
[#5954]: https://github.com/tokio-rs/tokio/pull/5954
[#5956]: https://github.com/tokio-rs/tokio/pull/5956
[#5958]: https://github.com/tokio-rs/tokio/pull/5958
[#5960]: https://github.com/tokio-rs/tokio/pull/5960
[#5962]: https://github.com/tokio-rs/tokio/pull/5962
[#5971]: https://github.com/tokio-rs/tokio/pull/5971
[#5972]: https://github.com/tokio-rs/tokio/pull/5972
[#5977]: https://github.com/tokio-rs/tokio/pull/5977
[#5978]: https://github.com/tokio-rs/tokio/pull/5978
[#5984]: https://github.com/tokio-rs/tokio/pull/5984
[#5985]: https://github.com/tokio-rs/tokio/pull/5985
[#5988]: https://github.com/tokio-rs/tokio/pull/5988
[#5994]: https://github.com/tokio-rs/tokio/pull/5994
[#5997]: https://github.com/tokio-rs/tokio/pull/5997
[#5998]: https://github.com/tokio-rs/tokio/pull/5998
[#6002]: https://github.com/tokio-rs/tokio/pull/6002
[#6014]: https://github.com/tokio-rs/tokio/pull/6014
[#6017]: https://github.com/tokio-rs/tokio/pull/6017
[#6018]: https://github.com/tokio-rs/tokio/pull/6018
[#6021]: https://github.com/tokio-rs/tokio/pull/6021
[#6030]: https://github.com/tokio-rs/tokio/pull/6030
[#6031]: https://github.com/tokio-rs/tokio/pull/6031
[#6032]: https://github.com/tokio-rs/tokio/pull/6032
[#6036]: https://github.com/tokio-rs/tokio/pull/6036
[#6037]: https://github.com/tokio-rs/tokio/pull/6037
[#6042]: https://github.com/tokio-rs/tokio/pull/6042
[#6045]: https://github.com/tokio-rs/tokio/pull/6045
[#6050]: https://github.com/tokio-rs/tokio/pull/6050
[#6056]: https://github.com/tokio-rs/tokio/pull/6056
[#6058]: https://github.com/tokio-rs/tokio/pull/6058
# 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://github.com/tokio-rs/tokio/pull/6221
# 1.32.0 (August 16, 2023)
### 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 scalability of alt runtime as the number of cores grows ([#5935])
[#5925]: https://github.com/tokio-rs/tokio/pull/5925
[#5930]: https://github.com/tokio-rs/tokio/pull/5930
[#5781]: https://github.com/tokio-rs/tokio/pull/5781
[#5935]: https://github.com/tokio-rs/tokio/pull/5935
# 1.31.0 (August 10, 2023)
### Fixed
* io: delegate `WriteHalf::poll_write_vectored` ([#5914])
### Unstable
* rt(alt): fix memory leak in unstable next-gen scheduler prototype ([#5911])
* rt: expose mean task poll time metric ([#5927])
[#5914]: https://github.com/tokio-rs/tokio/pull/5914
[#5911]: https://github.com/tokio-rs/tokio/pull/5911
[#5927]: https://github.com/tokio-rs/tokio/pull/5927
# 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://github.com/tokio-rs/tokio/pull/5820
[#5823]: https://github.com/tokio-rs/tokio/pull/5823
[#5824]: https://github.com/tokio-rs/tokio/pull/5824
[#5829]: https://github.com/tokio-rs/tokio/pull/5829
[#5858]: https://github.com/tokio-rs/tokio/pull/5858
[#5859]: https://github.com/tokio-rs/tokio/pull/5859
[#5863]: https://github.com/tokio-rs/tokio/pull/5863
[#5864]: https://github.com/tokio-rs/tokio/pull/5864
[#5865]: https://github.com/tokio-rs/tokio/pull/5865
[#5868]: https://github.com/tokio-rs/tokio/pull/5868
[#5869]: https://github.com/tokio-rs/tokio/pull/5869
[#5878]: https://github.com/tokio-rs/tokio/pull/5878
[#5881]: https://github.com/tokio-rs/tokio/pull/5881
[#5885]: https://github.com/tokio-rs/tokio/pull/5885
[#5887]: https://github.com/tokio-rs/tokio/pull/5887
[#5890]: https://github.com/tokio-rs/tokio/pull/5890
[#5899]: https://github.com/tokio-rs/tokio/pull/5899
[#5908]: https://github.com/tokio-rs/tokio/pull/5908
[#5916]: https://github.com/tokio-rs/tokio/pull/5916
# 1.29.1 (June 29, 2023)
### Fixed
- rt: fix nesting two `block_in_place` with a `block_on` between ([#5837])
[#5837]: https://github.com/tokio-rs/tokio/pull/5837
# 1.29.0 (June 27, 2023)
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://github.com/tokio-rs/tokio/pull/5766
[#5653]: https://github.com/tokio-rs/tokio/pull/5653
[#5686]: https://github.com/tokio-rs/tokio/pull/5686
[#5712]: https://github.com/tokio-rs/tokio/pull/5712
[#5693]: https://github.com/tokio-rs/tokio/pull/5693
[#5772]: https://github.com/tokio-rs/tokio/pull/5772
[#5710]: https://github.com/tokio-rs/tokio/pull/5710
[#5803]: https://github.com/tokio-rs/tokio/pull/5803
[#5705]: https://github.com/tokio-rs/tokio/pull/5705
[#5720]: https://github.com/tokio-rs/tokio/pull/5720
[#5659]: https://github.com/tokio-rs/tokio/pull/5659
[#5628]: https://github.com/tokio-rs/tokio/pull/5628
[#5666]: https://github.com/tokio-rs/tokio/pull/5666
[#5672]: https://github.com/tokio-rs/tokio/pull/5672
[#5690]: https://github.com/tokio-rs/tokio/pull/5690
[#5704]: https://github.com/tokio-rs/tokio/pull/5704
[#5566]: https://github.com/tokio-rs/tokio/pull/5566
[#5721]: https://github.com/tokio-rs/tokio/pull/5721
[#5790]: https://github.com/tokio-rs/tokio/pull/5790
[#5608]: https://github.com/tokio-rs/tokio/pull/5608
[#5676]: https://github.com/tokio-rs/tokio/pull/5676
[#5708]: https://github.com/tokio-rs/tokio/pull/5708
[#5717]: https://github.com/tokio-rs/tokio/pull/5717
[#5685]: https://github.com/tokio-rs/tokio/pull/5685
# 1.28.2 (May 28, 2023)
Forward ports 1.18.6 changes.
### Fixed
- deps: disable default features for mio ([#5728])
[#5728]: https://github.com/tokio-rs/tokio/pull/5728
# 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://github.com/tokio-rs/tokio/pull/5677
# 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://github.com/tokio-rs/tokio/pull/5065
[#5503]: https://github.com/tokio-rs/tokio/pull/5503
[#5542]: https://github.com/tokio-rs/tokio/pull/5542
[#5578]: https://github.com/tokio-rs/tokio/pull/5578
[#5583]: https://github.com/tokio-rs/tokio/pull/5583
[#5587]: https://github.com/tokio-rs/tokio/pull/5587
[#5590]: https://github.com/tokio-rs/tokio/pull/5590
[#5591]: https://github.com/tokio-rs/tokio/pull/5591
[#5607]: https://github.com/tokio-rs/tokio/pull/5607
[#5610]: https://github.com/tokio-rs/tokio/pull/5610
[#5611]: https://github.com/tokio-rs/tokio/pull/5611
[#5612]: https://github.com/tokio-rs/tokio/pull/5612
[#5618]: https://github.com/tokio-rs/tokio/pull/5618
[#5621]: https://github.com/tokio-rs/tokio/pull/5621
[#5645]: https://github.com/tokio-rs/tokio/pull/5645
[#5647]: https://github.com/tokio-rs/tokio/pull/5647
# 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://github.com/tokio-rs/tokio/pull/5512
[#5514]: https://github.com/tokio-rs/tokio/pull/5514
[#5520]: https://github.com/tokio-rs/tokio/pull/5520
[#5525]: https://github.com/tokio-rs/tokio/pull/5525
[#5527]: https://github.com/tokio-rs/tokio/pull/5527
[#5540]: https://github.com/tokio-rs/tokio/pull/5540
[#5543]: https://github.com/tokio-rs/tokio/pull/5543
[#5553]: https://github.com/tokio-rs/tokio/pull/5553
[#5555]: https://github.com/tokio-rs/tokio/pull/5555
[#5557]: https://github.com/tokio-rs/tokio/pull/5557
[#5558]: https://github.com/tokio-rs/tokio/pull/5558
[#5559]: https://github.com/tokio-rs/tokio/pull/5559
[#5572]: https://github.com/tokio-rs/tokio/pull/5572
[#5573]: https://github.com/tokio-rs/tokio/pull/5573
[#5574]: https://github.com/tokio-rs/tokio/pull/5574
[#5575]: https://github.com/tokio-rs/tokio/pull/5575
[#5576]: https://github.com/tokio-rs/tokio/pull/5576
# 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]: https://github.com/tokio-rs/tokio/pull/4299
[#5350]: https://github.com/tokio-rs/tokio/pull/5350
[#5351]: https://github.com/tokio-rs/tokio/pull/5351
[#5386]: https://github.com/tokio-rs/tokio/pull/5386
[#5394]: https://github.com/tokio-rs/tokio/pull/5394
[#5410]: https://github.com/tokio-rs/tokio/pull/5410
[#5413]: https://github.com/tokio-rs/tokio/pull/5413
[#5422]: https://github.com/tokio-rs/tokio/pull/5422
[#5434]: https://github.com/tokio-rs/tokio/pull/5434
[#5448]: https://github.com/tokio-rs/tokio/pull/5448
[#5452]: https://github.com/tokio-rs/tokio/pull/5452
[#5458]: https://github.com/tokio-rs/tokio/pull/5458
[#5459]: https://github.com/tokio-rs/tokio/pull/5459
[#5464]: https://github.com/tokio-rs/tokio/pull/5464
[#5468]: https://github.com/tokio-rs/tokio/pull/5468
[#5469]: https://github.com/tokio-rs/tokio/pull/5469
[#5471]: https://github.com/tokio-rs/tokio/pull/5471
[#5474]: https://github.com/tokio-rs/tokio/pull/5474
[#5475]: https://github.com/tokio-rs/tokio/pull/5475
[#5477]: https://github.com/tokio-rs/tokio/pull/5477
[#5480]: https://github.com/tokio-rs/tokio/pull/5480
[#5481]: https://github.com/tokio-rs/tokio/pull/5481
[#5483]: https://github.com/tokio-rs/tokio/pull/5483
[#5486]: https://github.com/tokio-rs/tokio/pull/5486
[#5494]: https://github.com/tokio-rs/tokio/pull/5494
[#5497]: https://github.com/tokio-rs/tokio/pull/5497
[#5504]: https://github.com/tokio-rs/tokio/pull/5504
[#5509]: https://github.com/tokio-rs/tokio/pull/5509
[#5511]: https://github.com/tokio-rs/tokio/pull/5511
[#5513]: https://github.com/tokio-rs/tokio/pull/5513
[#5517]: https://github.com/tokio-rs/tokio/pull/5517
# 1.25.3 (December 17th, 2023)
### Fixed
- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221])
[#6221]: https://github.com/tokio-rs/tokio/pull/6221
# 1.25.2 (September 22, 2023)
Forward ports 1.20.6 changes.
### Changed
- io: use `memchr` from `libc` ([#5960])
[#5960]: https://github.com/tokio-rs/tokio/pull/5960
# 1.25.1 (May 28, 2023)
Forward ports 1.18.6 changes.
### Fixed
- deps: disable default features for mio ([#5728])
[#5728]: https://github.com/tokio-rs/tokio/pull/5728
# 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://github.com/tokio-rs/tokio/pull/5330
[#5343]: https://github.com/tokio-rs/tokio/pull/5343
[#5397]: https://github.com/tokio-rs/tokio/pull/5397
# 1.24.2 (January 17, 2023)
Forward ports 1.18.5 changes.
### Fixed
- io: fix unsoundness in `ReadHalf::unsplit` ([#5375])
[#5375]: https://github.com/tokio-rs/tokio/pull/5375
# 1.24.1 (January 6, 2022)
This release fixes a compilation failure on targets without `AtomicU64` when using rustc older than 1.63. ([#5356])
[#5356]: https://github.com/tokio-rs/tokio/pull/5356
# 1.24.0 (January 5, 2022)
### 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://github.com/tokio-rs/tokio/pull/5186
[#5294]: https://github.com/tokio-rs/tokio/pull/5294
[#5284]: https://github.com/tokio-rs/tokio/pull/5284
[#4250]: https://github.com/tokio-rs/tokio/pull/4250
[#5300]: https://github.com/tokio-rs/tokio/pull/5300
[#5329]: https://github.com/tokio-rs/tokio/pull/5329
[#5115]: https://github.com/tokio-rs/tokio/pull/5115
[#5309]: https://github.com/tokio-rs/tokio/pull/5309
# 1.23.1 (January 4, 2022)
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://github.com/tokio-rs/tokio/pull/5336
# 1.23.0 (December 5, 2022)
### 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://github.com/tokio-rs/tokio/pull/5208
[#5216]: https://github.com/tokio-rs/tokio/pull/5216
[#5213]: https://github.com/tokio-rs/tokio/pull/5213
[#5204]: https://github.com/tokio-rs/tokio/pull/5204
[#5223]: https://github.com/tokio-rs/tokio/pull/5223
[#5231]: https://github.com/tokio-rs/tokio/pull/5231
# 1.22.0 (November 17, 2022)
### 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://github.com/tokio-rs/tokio/pull/4948
[#5040]: https://github.com/tokio-rs/tokio/pull/5040
[#5042]: https://github.com/tokio-rs/tokio/pull/5042
[#5061]: https://github.com/tokio-rs/tokio/pull/5061
[#5066]: https://github.com/tokio-rs/tokio/pull/5066
[#5073]: https://github.com/tokio-rs/tokio/pull/5073
[#5078]: https://github.com/tokio-rs/tokio/pull/5078
[#5087]: https://github.com/tokio-rs/tokio/pull/5087
[#5093]: https://github.com/tokio-rs/tokio/pull/5093
[#5095]: https://github.com/tokio-rs/tokio/pull/5095
[#5099]: https://github.com/tokio-rs/tokio/pull/5099
[#5104]: https://github.com/tokio-rs/tokio/pull/5104
[#5106]: https://github.com/tokio-rs/tokio/pull/5106
[#5107]: https://github.com/tokio-rs/tokio/pull/5107
[#5114]: https://github.com/tokio-rs/tokio/pull/5114
[#5117]: https://github.com/tokio-rs/tokio/pull/5117
[#5118]: https://github.com/tokio-rs/tokio/pull/5118
[#5120]: https://github.com/tokio-rs/tokio/pull/5120
[#5121]: https://github.com/tokio-rs/tokio/pull/5121
[#5125]: https://github.com/tokio-rs/tokio/pull/5125
[#5126]: https://github.com/tokio-rs/tokio/pull/5126
[#5127]: https://github.com/tokio-rs/tokio/pull/5127
[#5128]: https://github.com/tokio-rs/tokio/pull/5128
[#5130]: https://github.com/tokio-rs/tokio/pull/5130
[#5134]: https://github.com/tokio-rs/tokio/pull/5134
[#5135]: https://github.com/tokio-rs/tokio/pull/5135
[#5138]: https://github.com/tokio-rs/tokio/pull/5138
[#5138]: https://github.com/tokio-rs/tokio/pull/5138
[#5139]: https://github.com/tokio-rs/tokio/pull/5139
[#5140]: https://github.com/tokio-rs/tokio/pull/5140
[#5141]: https://github.com/tokio-rs/tokio/pull/5141
[#5143]: https://github.com/tokio-rs/tokio/pull/5143
[#5144]: https://github.com/tokio-rs/tokio/pull/5144
[#5144]: https://github.com/tokio-rs/tokio/pull/5144
[#5146]: https://github.com/tokio-rs/tokio/pull/5146
[#5150]: https://github.com/tokio-rs/tokio/pull/5150
[#5151]: https://github.com/tokio-rs/tokio/pull/5151
[#5152]: https://github.com/tokio-rs/tokio/pull/5152
[#5154]: https://github.com/tokio-rs/tokio/pull/5154
[#5155]: https://github.com/tokio-rs/tokio/pull/5155
[#5157]: https://github.com/tokio-rs/tokio/pull/5157
[#5158]: https://github.com/tokio-rs/tokio/pull/5158
[#5159]: https://github.com/tokio-rs/tokio/pull/5159
[#5160]: https://github.com/tokio-rs/tokio/pull/5160
[#5161]: https://github.com/tokio-rs/tokio/pull/5161
[#5163]: https://github.com/tokio-rs/tokio/pull/5163
[#5166]: https://github.com/tokio-rs/tokio/pull/5166
[#5167]: https://github.com/tokio-rs/tokio/pull/5167
[#5168]: https://github.com/tokio-rs/tokio/pull/5168
[#5169]: https://github.com/tokio-rs/tokio/pull/5169
[#5171]: https://github.com/tokio-rs/tokio/pull/5171
[#5172]: https://github.com/tokio-rs/tokio/pull/5172
[#5175]: https://github.com/tokio-rs/tokio/pull/5175
[#5178]: https://github.com/tokio-rs/tokio/pull/5178
[#5179]: https://github.com/tokio-rs/tokio/pull/5179
[#5182]: https://github.com/tokio-rs/tokio/pull/5182
[#5189]: https://github.com/tokio-rs/tokio/pull/5189
[#5191]: https://github.com/tokio-rs/tokio/pull/5191
[#5198]: https://github.com/tokio-rs/tokio/pull/5198
# 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://github.com/tokio-rs/tokio/pull/5048
# 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://github.com/tokio-rs/tokio/pull/4976
[#5000]: https://github.com/tokio-rs/tokio/pull/5000
# 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://github.com/tokio-rs/tokio/pull/4595
[#4716]: https://github.com/tokio-rs/tokio/pull/4716
[#4765]: https://github.com/tokio-rs/tokio/pull/4765
[#4805]: https://github.com/tokio-rs/tokio/pull/4805
[#4811]: https://github.com/tokio-rs/tokio/pull/4811
[#4823]: https://github.com/tokio-rs/tokio/pull/4823
[#4824]: https://github.com/tokio-rs/tokio/pull/4824
[#4837]: https://github.com/tokio-rs/tokio/pull/4837
[#4840]: https://github.com/tokio-rs/tokio/pull/4840
[#4841]: https://github.com/tokio-rs/tokio/pull/4841
[#4845]: https://github.com/tokio-rs/tokio/pull/4845
[#4848]: https://github.com/tokio-rs/tokio/pull/4848
[#4849]: https://github.com/tokio-rs/tokio/pull/4849
[#4852]: https://github.com/tokio-rs/tokio/pull/4852
[#4858]: https://github.com/tokio-rs/tokio/pull/4858
[#4867]: https://github.com/tokio-rs/tokio/pull/4867
[#4877]: https://github.com/tokio-rs/tokio/pull/4877
[#4882]: https://github.com/tokio-rs/tokio/pull/4882
[#4886]: https://github.com/tokio-rs/tokio/pull/4886
[#4893]: https://github.com/tokio-rs/tokio/pull/4893
[#4894]: https://github.com/tokio-rs/tokio/pull/4894
[#4897]: https://github.com/tokio-rs/tokio/pull/4897
[#4898]: https://github.com/tokio-rs/tokio/pull/4898
[#4901]: https://github.com/tokio-rs/tokio/pull/4901
[#4904]: https://github.com/tokio-rs/tokio/pull/4904
[#4920]: https://github.com/tokio-rs/tokio/pull/4920
[#4924]: https://github.com/tokio-rs/tokio/pull/4924
[#4928]: https://github.com/tokio-rs/tokio/pull/4928
[#4935]: https://github.com/tokio-rs/tokio/pull/4935
[#4936]: https://github.com/tokio-rs/tokio/pull/4936
[#4937]: https://github.com/tokio-rs/tokio/pull/4937
[#4942]: https://github.com/tokio-rs/tokio/pull/4942
[#4945]: https://github.com/tokio-rs/tokio/pull/4945
[#4951]: https://github.com/tokio-rs/tokio/pull/4951
[#4953]: https://github.com/tokio-rs/tokio/pull/4953
[#4956]: https://github.com/tokio-rs/tokio/pull/4956
[#4959]: https://github.com/tokio-rs/tokio/pull/4959
# 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://github.com/tokio-rs/tokio/pull/5960
# 1.20.5 (May 28, 2023)
Forward ports 1.18.6 changes.
### Fixed
- deps: disable default features for mio ([#5728])
[#5728]: https://github.com/tokio-rs/tokio/pull/5728
# 1.20.4 (January 17, 2023)
Forward ports 1.18.5 changes.
### Fixed
- io: fix unsoundness in `ReadHalf::unsplit` ([#5375])
[#5375]: https://github.com/tokio-rs/tokio/pull/5375
# 1.20.3 (January 3, 2022)
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://github.com/tokio-rs/tokio/pull/5336
# 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://github.com/tokio-rs/tokio/pull/5048
# 1.20.1 (July 25, 2022)
### Fixed
- chore: fix version detection in build script ([#4860])
[#4860]: https://github.com/tokio-rs/tokio/pull/4860
# 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])
### 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 config for current thread rt ([#4770])
[#4677]: https://github.com/tokio-rs/tokio/pull/4677
[#4741]: https://github.com/tokio-rs/tokio/pull/4741
[#4755]: https://github.com/tokio-rs/tokio/pull/4755
[#4758]: https://github.com/tokio-rs/tokio/pull/4758
[#4762]: https://github.com/tokio-rs/tokio/pull/4762
[#4764]: https://github.com/tokio-rs/tokio/pull/4764
[#4766]: https://github.com/tokio-rs/tokio/pull/4766
[#4767]: https://github.com/tokio-rs/tokio/pull/4767
[#4769]: https://github.com/tokio-rs/tokio/pull/4769
[#4770]: https://github.com/tokio-rs/tokio/pull/4770
[#4772]: https://github.com/tokio-rs/tokio/pull/4772
[#4777]: https://github.com/tokio-rs/tokio/pull/4777
[#4791]: https://github.com/tokio-rs/tokio/pull/4791
[#4793]: https://github.com/tokio-rs/tokio/pull/4793
[#4795]: https://github.com/tokio-rs/tokio/pull/4795
[#4798]: https://github.com/tokio-rs/tokio/pull/4798
[#4806]: https://github.com/tokio-rs/tokio/pull/4806
[#4808]: https://github.com/tokio-rs/tokio/pull/4808
# 1.19.2 (June 6, 2022)
This release fixes another bug in `Notified::enable`. ([#4751])
[#4751]: https://github.com/tokio-rs/tokio/pull/4751
# 1.19.1 (June 5, 2022)
This release fixes a bug in `Notified::enable`. ([#4747])
[#4747]: https://github.com/tokio-rs/tokio/pull/4747
# 1.19.0 (June 3, 2022)
### Added
- runtime: add `is_finished` method for `JoinHandle` and `AbortHandle` ([#4709])
- runtime: make global queue and event polling intervals configurable ([#4671])
- sync: add `Notified::enable` ([#4705])
- sync: add `watch::Sender::send_if_modified` ([#4591])
- sync: add resubscribe method to broadcast::Receiver ([#4607])
- net: add `take_error` to `TcpSocket` and `TcpStream` ([#4739])
### Changed
- io: refactor out usage of Weak in the io handle ([#4656])
### Fixed
- macros: avoid starvation in `join!` and `try_join!` ([#4624])
### Documented
- runtime: clarify semantics of tasks outliving `block_on` ([#4729])
- time: fix example for `MissedTickBehavior::Burst` ([#4713])
### Unstable
- metrics: correctly update atomics in `IoDriverMetrics` ([#4725])
- metrics: fix compilation with unstable, process, and rt, but without net ([#4682])
- task: add `#[track_caller]` to `JoinSet`/`JoinMap` ([#4697])
- task: add `Builder::{spawn_on, spawn_local_on, spawn_blocking_on}` ([#4683])
- task: add `consume_budget` for cooperative scheduling ([#4498])
- task: add `join_set::Builder` for configuring `JoinSet` tasks ([#4687])
- task: update return value of `JoinSet::join_one` ([#4726])
[#4498]: https://github.com/tokio-rs/tokio/pull/4498
[#4591]: https://github.com/tokio-rs/tokio/pull/4591
[#4607]: https://github.com/tokio-rs/tokio/pull/4607
[#4624]: https://github.com/tokio-rs/tokio/pull/4624
[#4656]: https://github.com/tokio-rs/tokio/pull/4656
[#4671]: https://github.com/tokio-rs/tokio/pull/4671
[#4682]: https://github.com/tokio-rs/tokio/pull/4682
[#4683]: https://github.com/tokio-rs/tokio/pull/4683
[#4687]: https://github.com/tokio-rs/tokio/pull/4687
[#4697]: https://github.com/tokio-rs/tokio/pull/4697
[#4705]: https://github.com/tokio-rs/tokio/pull/4705
[#4709]: https://github.com/tokio-rs/tokio/pull/4709
[#4713]: https://github.com/tokio-rs/tokio/pull/4713
[#4725]: https://github.com/tokio-rs/tokio/pull/4725
[#4726]: https://github.com/tokio-rs/tokio/pull/4726
[#4729]: https://github.com/tokio-rs/tokio/pull/4729
[#4739]: https://github.com/tokio-rs/tokio/pull/4739
# 1.18.6 (May 28, 2023)
### Fixed
- deps: disable default features for mio ([#5728])
[#5728]: https://github.com/tokio-rs/tokio/pull/5728
# 1.18.5 (January 17, 2023)
### Fixed
- io: fix unsoundness in `ReadHalf::unsplit` ([#5375])
[#5375]: https://github.com/tokio-rs/tokio/pull/5375
# 1.18.4 (January 3, 2022)
### Fixed
- net: fix Windows named pipe server builder to maintain option when toggling
pipe mode ([#5336]).
[#5336]: https://github.com/tokio-rs/tokio/pull/5336
# 1.18.3 (September 27, 2022)
This release removes the dependency on the `once_cell` crate to restore the MSRV
of the 1.18.x LTS release. ([#5048])
[#5048]: https://github.com/tokio-rs/tokio/pull/5048
# 1.18.2 (May 5, 2022)
Add missing features for the `winapi` dependency. ([#4663])
[#4663]: https://github.com/tokio-rs/tokio/pull/4663
# 1.18.1 (May 2, 2022)
The 1.18.0 release broke the build for targets without 64-bit atomics when
building with `tokio_unstable`. This release fixes that. ([#4649])
[#4649]: https://github.com/tokio-rs/tokio/pull/4649
# 1.18.0 (April 27, 2022)
This release adds a number of new APIs in `tokio::net`, `tokio::signal`, and
`tokio::sync`. In addition, it adds new unstable APIs to `tokio::task` (`Id`s
for uniquely identifying a task, and `AbortHandle` for remotely cancelling a
task), as well as a number of bugfixes.
### Fixed
- blocking: add missing `#[track_caller]` for `spawn_blocking` ([#4616])
- macros: fix `select` macro to process 64 branches ([#4519])
- net: fix `try_io` methods not calling Mio's `try_io` internally ([#4582])
- runtime: recover when OS fails to spawn a new thread ([#4485])
### Added
- net: add `UdpSocket::peer_addr` ([#4611])
- net: add `try_read_buf` method for named pipes ([#4626])
- signal: add `SignalKind` `Hash`/`Eq` impls and `c_int` conversion ([#4540])
- signal: add support for signals up to `SIGRTMAX` ([#4555])
- sync: add `watch::Sender::send_modify` method ([#4310])
- sync: add `broadcast::Receiver::len` method ([#4542])
- sync: add `watch::Receiver::same_channel` method ([#4581])
- sync: implement `Clone` for `RecvError` types ([#4560])
### Changed
- update `mio` to 0.8.1 ([#4582])
- macros: rename `tokio::select!`'s internal `util` module ([#4543])
- runtime: use `Vec::with_capacity` when building runtime ([#4553])
### Documented
- improve docs for `tokio_unstable` ([#4524])
- runtime: include more documentation for thread_pool/worker ([#4511])
- runtime: update `Handle::current`'s docs to mention `EnterGuard` ([#4567])
- time: clarify platform specific timer resolution ([#4474])
- signal: document that `Signal::recv` is cancel-safe ([#4634])
- sync: `UnboundedReceiver` close docs ([#4548])
### Unstable
The following changes only apply when building with `--cfg tokio_unstable`:
- task: add `task::Id` type ([#4630])
- task: add `AbortHandle` type for cancelling tasks in a `JoinSet` ([#4530],
[#4640])
- task: fix missing `doc(cfg(...))` attributes for `JoinSet` ([#4531])
- task: fix broken link in `AbortHandle` RustDoc ([#4545])
- metrics: add initial IO driver metrics ([#4507])
[#4616]: https://github.com/tokio-rs/tokio/pull/4616
[#4519]: https://github.com/tokio-rs/tokio/pull/4519
[#4582]: https://github.com/tokio-rs/tokio/pull/4582
[#4485]: https://github.com/tokio-rs/tokio/pull/4485
[#4613]: https://github.com/tokio-rs/tokio/pull/4613
[#4611]: https://github.com/tokio-rs/tokio/pull/4611
[#4626]: https://github.com/tokio-rs/tokio/pull/4626
[#4540]: https://github.com/tokio-rs/tokio/pull/4540
[#4555]: https://github.com/tokio-rs/tokio/pull/4555
[#4310]: https://github.com/tokio-rs/tokio/pull/4310
[#4542]: https://github.com/tokio-rs/tokio/pull/4542
[#4581]: https://github.com/tokio-rs/tokio/pull/4581
[#4560]: https://github.com/tokio-rs/tokio/pull/4560
[#4631]: https://github.com/tokio-rs/tokio/pull/4631
[#4582]: https://github.com/tokio-rs/tokio/pull/4582
[#4543]: https://github.com/tokio-rs/tokio/pull/4543
[#4553]: https://github.com/tokio-rs/tokio/pull/4553
[#4524]: https://github.com/tokio-rs/tokio/pull/4524
[#4511]: https://github.com/tokio-rs/tokio/pull/4511
[#4567]: https://github.com/tokio-rs/tokio/pull/4567
[#4474]: https://github.com/tokio-rs/tokio/pull/4474
[#4634]: https://github.com/tokio-rs/tokio/pull/4634
[#4548]: https://github.com/tokio-rs/tokio/pull/4548
[#4630]: https://github.com/tokio-rs/tokio/pull/4630
[#4530]: https://github.com/tokio-rs/tokio/pull/4530
[#4640]: https://github.com/tokio-rs/tokio/pull/4640
[#4531]: https://github.com/tokio-rs/tokio/pull/4531
[#4545]: https://github.com/tokio-rs/tokio/pull/4545
[#4507]: https://github.com/tokio-rs/tokio/pull/4507
# 1.17.0 (February 16, 2022)
This release updates the minimum supported Rust version (MSRV) to 1.49, the
`mio` dependency to v0.8, and the (optional) `parking_lot` dependency to v0.12.
Additionally, it contains several bug fixes, as well as internal refactoring and
performance improvements.
### Fixed
- time: prevent panicking in `sleep` with large durations ([#4495])
- time: eliminate potential panics in `Instant` arithmetic on platforms where
`Instant::now` is not monotonic ([#4461])
- io: fix `DuplexStream` not participating in cooperative yielding ([#4478])
- rt: fix potential double panic when dropping a `JoinHandle` ([#4430])
### Changed
- update minimum supported Rust version to 1.49 ([#4457])
- update `parking_lot` dependency to v0.12.0 ([#4459])
- update `mio` dependency to v0.8 ([#4449])
- rt: remove an unnecessary lock in the blocking pool ([#4436])
- rt: remove an unnecessary enum in the basic scheduler ([#4462])
- time: use bit manipulation instead of modulo to improve performance ([#4480])
- net: use `std::future::Ready` instead of our own `Ready` future ([#4271])
- replace deprecated `atomic::spin_loop_hint` with `hint::spin_loop` ([#4491])
- fix miri failures in intrusive linked lists ([#4397])
### Documented
- io: add an example for `tokio::process::ChildStdin` ([#4479])
### Unstable
The following changes only apply when building with `--cfg tokio_unstable`:
- task: fix missing location information in `tracing` spans generated by
`spawn_local` ([#4483])
- task: add `JoinSet` for managing sets of tasks ([#4335])
- metrics: fix compilation error on MIPS ([#4475])
- metrics: fix compilation error on arm32v7 ([#4453])
[#4495]: https://github.com/tokio-rs/tokio/pull/4495
[#4461]: https://github.com/tokio-rs/tokio/pull/4461
[#4478]: https://github.com/tokio-rs/tokio/pull/4478
[#4430]: https://github.com/tokio-rs/tokio/pull/4430
[#4457]: https://github.com/tokio-rs/tokio/pull/4457
[#4459]: https://github.com/tokio-rs/tokio/pull/4459
[#4449]: https://github.com/tokio-rs/tokio/pull/4449
[#4462]: https://github.com/tokio-rs/tokio/pull/4462
[#4436]: https://github.com/tokio-rs/tokio/pull/4436
[#4480]: https://github.com/tokio-rs/tokio/pull/4480
[#4271]: https://github.com/tokio-rs/tokio/pull/4271
[#4491]: https://github.com/tokio-rs/tokio/pull/4491
[#4397]: https://github.com/tokio-rs/tokio/pull/4397
[#4479]: https://github.com/tokio-rs/tokio/pull/4479
[#4483]: https://github.com/tokio-rs/tokio/pull/4483
[#4335]: https://github.com/tokio-rs/tokio/pull/4335
[#4475]: https://github.com/tokio-rs/tokio/pull/4475
[#4453]: https://github.com/tokio-rs/tokio/pull/4453
# 1.16.1 (January 28, 2022)
This release fixes a bug in [#4428] with the change [#4437].
[#4428]: https://github.com/tokio-rs/tokio/pull/4428
[#4437]: https://github.com/tokio-rs/tokio/pull/4437
# 1.16.0 (January 27, 2022)
Fixes a soundness bug in `io::Take` ([#4428]). The unsoundness is exposed when
leaking memory in the given `AsyncRead` implementation and then overwriting the
supplied buffer:
```rust
impl AsyncRead for Buggy {
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>
) -> Poll<Result<()>> {
let new_buf = vec![0; 5].leak();
*buf = ReadBuf::new(new_buf);
buf.put_slice(b"hello");
Poll::Ready(Ok(()))
}
}
```
Also, this release includes improvements to the multi-threaded scheduler that
can increase throughput by up to 20% in some cases ([#4383]).
### Fixed
- io: **soundness** don't expose uninitialized memory when using `io::Take` in edge case ([#4428])
- fs: ensure `File::write` results in a `write` syscall when the runtime shuts down ([#4316])
- process: drop pipe after child exits in `wait_with_output` ([#4315])
- rt: improve error message when spawning a thread fails ([#4398])
- rt: reduce false-positive thread wakups in the multi-threaded scheduler ([#4383])
- sync: don't inherit `Send` from `parking_lot::*Guard` ([#4359])
### Added
- net: `TcpSocket::linger()` and `set_linger()` ([#4324])
- net: impl `UnwindSafe` for socket types ([#4384])
- rt: impl `UnwindSafe` for `JoinHandle` ([#4418])
- sync: `watch::Receiver::has_changed()` ([#4342])
- sync: `oneshot::Receiver::blocking_recv()` ([#4334])
- sync: `RwLock` blocking operations ([#4425])
### Unstable
The following changes only apply when building with `--cfg tokio_unstable`
- rt: **breaking change** overhaul runtime metrics API ([#4373])
[#4428]: https://github.com/tokio-rs/tokio/pull/4428
[#4316]: https://github.com/tokio-rs/tokio/pull/4316
[#4315]: https://github.com/tokio-rs/tokio/pull/4315
[#4398]: https://github.com/tokio-rs/tokio/pull/4398
[#4383]: https://github.com/tokio-rs/tokio/pull/4383
[#4359]: https://github.com/tokio-rs/tokio/pull/4359
[#4324]: https://github.com/tokio-rs/tokio/pull/4324
[#4384]: https://github.com/tokio-rs/tokio/pull/4384
[#4418]: https://github.com/tokio-rs/tokio/pull/4418
[#4342]: https://github.com/tokio-rs/tokio/pull/4342
[#4334]: https://github.com/tokio-rs/tokio/pull/4334
[#4425]: https://github.com/tokio-rs/tokio/pull/4425
[#4373]: https://github.com/tokio-rs/tokio/pull/4373
# 1.15.0 (December 15, 2021)
### Fixed
- io: add cooperative yielding support to `io::empty()` ([#4300])
- time: make timeout robust against budget-depleting tasks ([#4314])
### Changed
- update minimum supported Rust version to 1.46.
### Added
- time: add `Interval::reset()` ([#4248])
- io: add explicit lifetimes to `AsyncFdReadyGuard` ([#4267])
- process: add `Command::as_std()` ([#4295])
### Added (unstable)
- tracing: instrument `tokio::sync` types ([#4302])
[#4302]: https://github.com/tokio-rs/tokio/pull/4302
[#4300]: https://github.com/tokio-rs/tokio/pull/4300
[#4295]: https://github.com/tokio-rs/tokio/pull/4295
[#4267]: https://github.com/tokio-rs/tokio/pull/4267
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