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Bump tokio from 1.20.1 to 1.21.0

Ghost User requested to merge dependabot-cargo-tokio-1.21.0 into master

Bumps tokio from 1.20.1 to 1.21.0.

Release notes

Sourced from tokio's releases.

Tokio v1.21.0

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)

... (truncated)

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