v1.38.0: Tokio v1.38.0

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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)