tokio-1.54.0

# 1.54.0 (October 19th, 2026)

The 1.54.0 release includes all changes up to 1.53.3.

The MSRV is increased to 1.85. ([#8514])

### Added

- fs: add `File::set_times`, `File::set_modified`, and `fs::FileTimes` ([#8504])
- net: implement `Default` for `named_pipe::{ClientOptions, ServerOptions}` ([#8378])
- runtime: add `Builder::max_io_events_per_busy_tick` ([#8410])
- runtime: stabilize `tokio::runtime::worker_index()` ([#8431])
- sync: add `SemaphorePermit::semaphore()` ([#8482])
- sync: add `blocking_acquire` methods to `Semaphore` ([#8269])
- sync: add `watch::Receiver::is_closed` ([#8481])
- wasm: support JSPI for Emscripten target ([#8285], [#8627])
- wasm: support the `wasm32-unknown-emscripten` target ([#8281], [#8422], [#8528], [#8628])

### Changed

- fs: reject zero in `File::set_max_buf_size` ([#8449])
- io: make `copy_buf` cooperative ([#8459])
- io: panic when `BufReader` or `BufStream` is created with zero capacity ([#8494])
- io: panic when in-memory pipe is created with zero capacity ([#8397])
- io: reject zero buffer size in `copy_bidirectional_with_sizes` ([#8454])
- io: support vectored writes in `Sink` ([#8663])
- net: start `UnixStream::pair` and `UnixDatagram::pair` sockets as writable ([#8444])
- net: start accepted sockets as readable and writable ([#8435])
- net: support `UCred` on Fuchsia ([#8257])
- process: use `mio::unix::pipe` for Unix child stdio ([#8603])
- runtime: cache-pad the shared injection queue and idle state ([#8622])
- runtime: decide auto-boxing of spawned futures at monomorphization time ([#8414])
- runtime: make `enable_io` available whenever `rt` is enabled ([#8387])
- runtime: move `block_in_place` setup into a non-generic function ([#8315])
- runtime: move the multi-thread inject queue to its own mutex ([#8382])
- runtime: panic when `max_io_events_per_tick` is zero ([#8476])
- runtime: suggest `.await` in nested `block_on` panic message ([#8501])
- sync: avoid atomic reader count in broadcast slots ([#8357])
- sync: use acquire/release orderings in `Notify` ([#8325])
- time: remove the runtime handle from timers ([#8458])

### Fixed

- fs: restore `File` internal state when op fails ([#8291])
- io: complete zero-length memory stream operations immediately ([#8323])
- io: flush the writer when the reader stalls in `copy_buf` ([#8424])
- io: keep the shutdown bit when clearing readiness ([#8435])
- io: preserve the full `ScheduledIo` tick in readiness events ([#8331])
- io: read lines as bytes so a partial line survives an I/O error ([#8400])
- io: retry on `ErrorKind::Interrupted` in more I/O operations ([#8417], [#8432], [#8448], [#8453], [#8455], [#8460])
- io: use `spawn_mandatory_blocking` for stdout and stderr ([#8506])
- io: wait for pending operations before `BufReader` seeks ([#8599])
- net: close `CreateFileW` handle on `SetNamedPipeHandleState` failure ([#8418])
- net: fix peer credentials on NetBSD ([#8589])
- net: saturate `TcpSocket` and `UnixSocket` listen backlog ([#8511])
- net: treat `ENOTCONN` as success in `UnixStream::shutdown` ([#8526])
- runtime: allow building with `--all-features` without `tokio_unstable` ([#8401])
- runtime: avoid overflow in `shutdown_timeout()` ([#8497])
- runtime: fix `spawn_blocking` hang when only scheduler workers exist ([#8408])
- runtime: fix misleading signal driver panic message ([#8419])
- sync: preserve FIFO lock order when coop budget is exhausted ([#8371])
- sync: use `usize` for permit count in `SemaphorePermit` ([#8405])
- time: avoid interval deadline overflow ([#8385])
- time: handle wrapped top-level timer-wheel slots ([#8334])

### Unstable

- fs: fall back when `io_uring` has no IO driver ([#8165])
- metrics: cap log histogram precision ([#8496])
- runtime: add an opt-in sharded `spawn_blocking` queue ([#8337])
- runtime: expose schedule latency in task hooks ([#8282])
- taskdump: fix idle bookkeeping when a task dump wakes parked workers ([#8372])
- taskdump: skip non-idle tasks during taskdumps ([#8568])

### Documented

- docs: fix stray braces and broken links in rustdoc ([#8605])
- fs: document cancellation behavior of `tokio::fs` ([#8265])
- net: add Safety docs for named pipe `from_raw_handle` ([#8378])
- net: document that `TcpStream::connect` returns only the last error ([#8421])
- runtime: add error documentation for `runtime::Builder` ([#8297])
- runtime: link `available_parallelism` in worker count docs ([#8625])
- sync: clarify panic behavior of `broadcast::channel()` ([#8420])
- sync: fix typo in `Semaphore` documentation ([#8521])

[#8165]: https://github.com/tokio-rs/tokio/pull/8165
[#8257]: https://github.com/tokio-rs/tokio/pull/8257
[#8265]: https://github.com/tokio-rs/tokio/pull/8265
[#8269]: https://github.com/tokio-rs/tokio/pull/8269
[#8281]: https://github.com/tokio-rs/tokio/pull/8281
[#8282]: https://github.com/tokio-rs/tokio/pull/8282
[#8285]: https://github.com/tokio-rs/tokio/pull/8285
[#8291]: https://github.com/tokio-rs/tokio/pull/8291
[#8297]: https://github.com/tokio-rs/tokio/pull/8297
[#8315]: https://github.com/tokio-rs/tokio/pull/8315
[#8323]: https://github.com/tokio-rs/tokio/pull/8323
[#8325]: https://github.com/tokio-rs/tokio/pull/8325
[#8331]: https://github.com/tokio-rs/tokio/pull/8331
[#8334]: https://github.com/tokio-rs/tokio/pull/8334
[#8337]: https://github.com/tokio-rs/tokio/pull/8337
[#8357]: https://github.com/tokio-rs/tokio/pull/8357
[#8371]: https://github.com/tokio-rs/tokio/pull/8371
[#8372]: https://github.com/tokio-rs/tokio/pull/8372
[#8378]: https://github.com/tokio-rs/tokio/pull/8378
[#8382]: https://github.com/tokio-rs/tokio/pull/8382
[#8385]: https://github.com/tokio-rs/tokio/pull/8385
[#8387]: https://github.com/tokio-rs/tokio/pull/8387
[#8397]: https://github.com/tokio-rs/tokio/pull/8397
[#8400]: https://github.com/tokio-rs/tokio/pull/8400
[#8401]: https://github.com/tokio-rs/tokio/pull/8401
[#8405]: https://github.com/tokio-rs/tokio/pull/8405
[#8408]: https://github.com/tokio-rs/tokio/pull/8408
[#8410]: https://github.com/tokio-rs/tokio/pull/8410
[#8414]: https://github.com/tokio-rs/tokio/pull/8414
[#8417]: https://github.com/tokio-rs/tokio/pull/8417
[#8418]: https://github.com/tokio-rs/tokio/pull/8418
[#8419]: https://github.com/tokio-rs/tokio/pull/8419
[#8420]: https://github.com/tokio-rs/tokio/pull/8420
[#8421]: https://github.com/tokio-rs/tokio/pull/8421
[#8422]: https://github.com/tokio-rs/tokio/pull/8422
[#8424]: https://github.com/tokio-rs/tokio/pull/8424
[#8431]: https://github.com/tokio-rs/tokio/pull/8431
[#8432]: https://github.com/tokio-rs/tokio/pull/8432
[#8435]: https://github.com/tokio-rs/tokio/pull/8435
[#8444]: https://github.com/tokio-rs/tokio/pull/8444
[#8448]: https://github.com/tokio-rs/tokio/pull/8448
[#8449]: https://github.com/tokio-rs/tokio/pull/8449
[#8453]: https://github.com/tokio-rs/tokio/pull/8453
[#8454]: https://github.com/tokio-rs/tokio/pull/8454
[#8455]: https://github.com/tokio-rs/tokio/pull/8455
[#8458]: https://github.com/tokio-rs/tokio/pull/8458
[#8459]: https://github.com/tokio-rs/tokio/pull/8459
[#8460]: https://github.com/tokio-rs/tokio/pull/8460
[#8476]: https://github.com/tokio-rs/tokio/pull/8476
[#8481]: https://github.com/tokio-rs/tokio/pull/8481
[#8482]: https://github.com/tokio-rs/tokio/pull/8482
[#8494]: https://github.com/tokio-rs/tokio/pull/8494
[#8496]: https://github.com/tokio-rs/tokio/pull/8496
[#8497]: https://github.com/tokio-rs/tokio/pull/8497
[#8501]: https://github.com/tokio-rs/tokio/pull/8501
[#8504]: https://github.com/tokio-rs/tokio/pull/8504
[#8506]: https://github.com/tokio-rs/tokio/pull/8506
[#8511]: https://github.com/tokio-rs/tokio/pull/8511
[#8514]: https://github.com/tokio-rs/tokio/pull/8514
[#8521]: https://github.com/tokio-rs/tokio/pull/8521
[#8526]: https://github.com/tokio-rs/tokio/pull/8526
[#8528]: https://github.com/tokio-rs/tokio/pull/8528
[#8568]: https://github.com/tokio-rs/tokio/pull/8568
[#8589]: https://github.com/tokio-rs/tokio/pull/8589
[#8599]: https://github.com/tokio-rs/tokio/pull/8599
[#8603]: https://github.com/tokio-rs/tokio/pull/8603
[#8605]: https://github.com/tokio-rs/tokio/pull/8605
[#8622]: https://github.com/tokio-rs/tokio/pull/8622
[#8625]: https://github.com/tokio-rs/tokio/pull/8625
[#8627]: https://github.com/tokio-rs/tokio/pull/8627
[#8628]: https://github.com/tokio-rs/tokio/pull/8628
[#8663]: https://github.com/tokio-rs/tokio/pull/8663