on:
  push:
    branches: ["master", "tokio-*.x"]
  pull_request:
    branches: ["master", "tokio-*.x"]

name: CI

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
  cancel-in-progress: true

env:
  RUSTFLAGS: -Dwarnings
  RUST_BACKTRACE: 1
  RUSTUP_WINDOWS_PATH_ADD_BIN: 1
  # Change to specific Rust release to pin
  rust_stable: stable
  rust_nightly: nightly-2025-01-25
  # Pin a specific miri version
  rust_miri_nightly: nightly-2025-06-02
  rust_clippy: '1.88'
  # When updating this, also update:
  # - README.md
  # - tokio/README.md
  # - CONTRIBUTING.md
  # - tokio/Cargo.toml
  # - tokio-util/Cargo.toml
  # - tokio-test/Cargo.toml
  # - tokio-stream/Cargo.toml
  rust_min: '1.70'

defaults:
  run:
    shell: bash

permissions:
  contents: read

jobs:
  # Depends on all actions that are required for a "successful" CI run.
  tests-pass:
    name: all systems go
    runs-on: ubuntu-latest
    needs:
      - test-tokio-full
      - test-workspace-all-features
      - test-integration-tests-per-feature
      - test-parking_lot
      - valgrind
      - test-unstable
      - miri-lib
      - miri-test
      - miri-doc
      - asan
      - cross-check
      - cross-check-tier3
      - cross-test-with-parking_lot
      - cross-test-without-parking_lot
      - no-atomic-u64-test
      - no-atomic-u64-check
      - features
      - minrust
      - minimal-versions
      - fmt
      - clippy
      - docs
      - loom-compile
      - check-readme
      - test-hyper
      - test-quinn
      - x86_64-fortanix-unknown-sgx
      - check-redox
      - wasm32-unknown-unknown
      - wasm32-wasip1
      - check-external-types
      - check-fuzzing
      - check-unstable-mt-counters
      - check-spelling
    steps:
      - run: exit 0

  # Basic actions that must pass before we kick off more expensive tests.
  basics:
    name: basic checks
    runs-on: ubuntu-latest
    needs:
      - clippy
      - fmt
      - docs
      - minrust
    steps:
      - run: exit 0

  test-tokio-full:
    needs: basics
    name: test tokio full
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2

      # Run `tokio` with `full` features. This excludes testing utilities which
      # can alter the runtime behavior of Tokio.
      - name: test tokio full
        run: |
          set -euxo pipefail
          cargo nextest run --features full
          cargo test --doc --features full
        working-directory: tokio

  test-workspace-all-features:
    needs: basics
    name: test all crates in the workspace with all features
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2

      # Test **all** crates in the workspace with all features.
      - name: test all --all-features
        run: |
          set -euxo pipefail
          cargo nextest run --workspace --all-features
          cargo test --doc --workspace --all-features

  test-workspace-all-features-panic-abort:
    needs: basics
    name: test all crates in the workspace with all features and panic=abort
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_nightly }}
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2

      - name: test all --all-features panic=abort
        run: |
          set -euxo pipefail
          RUSTFLAGS="$RUSTFLAGS -C panic=abort -Zpanic-abort-tests" cargo nextest run --workspace --exclude tokio-macros --exclude tests-build --all-features --tests

  test-integration-tests-per-feature:
    needs: basics
    name: Run integration tests for each feature
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}
      - name: Install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - uses: Swatinem/rust-cache@v2

      # Run integration tests for each feature
      - name: test tests-integration --each-feature
        run: cargo hack test --each-feature
        working-directory: tests-integration

      # Run macro build tests
      - name: test tests-build --each-feature
        run: cargo hack test --each-feature
        working-directory: tests-build

      # Check benchmarks.
      - name: Check benches
        run: cargo check --benches
        working-directory: benches
        if: startsWith(matrix.os, 'ubuntu')

  test-parking_lot:
    # The parking_lot crate has a feature called send_guard which changes when
    # some of its types are Send. Tokio has some measures in place to prevent
    # this from affecting when Tokio types are Send, and this test exists to
    # ensure that those measures are working.
    #
    # This relies on the potentially affected Tokio type being listed in
    # `tokio/tokio/tests/async_send_sync.rs`.
    name: compile tests with parking lot send guards
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}

      - name: Enable parking_lot send_guard feature
        # Inserts the line "plsend = ["parking_lot/send_guard"]" right after [features]
        run: sed -i '/\[features\]/a plsend = ["parking_lot/send_guard"]' tokio/Cargo.toml

      - uses: Swatinem/rust-cache@v2
      - name: Check tests with all features enabled
        run: cargo check --workspace --all-features --tests

  valgrind:
    name: valgrind
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: 1.82

      - name: Install Valgrind
        uses: taiki-e/install-action@valgrind

      - uses: Swatinem/rust-cache@v2
      # Compile tests
      - name: cargo build test-mem
        run: cargo build --features rt-net --bin test-mem
        working-directory: tests-integration

      # Run with valgrind
      - name: Run valgrind test-mem
        run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/debug/test-mem

      # Compile tests
      - name: cargo build test-process-signal
        run: cargo build --features rt-process-signal --bin test-process-signal
        working-directory: tests-integration

      # Run with valgrind
      - name: Run valgrind test-process-signal
        run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/debug/test-process-signal

  test-unstable:
    name: test tokio full --unstable
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: windows-latest
          - os: ubuntu-latest
          - os: macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2
      # Run `tokio` with "unstable" cfg flag.
      - name: test tokio full --cfg unstable
        run: |
          set -euxo pipefail
          cargo nextest run --all-features
          cargo test --doc --all-features
        working-directory: tokio
        env:
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings
          # in order to run doctests for unstable features, we must also pass
          # the unstable cfg to RustDoc
          RUSTDOCFLAGS: --cfg tokio_unstable

  test-unstable-taskdump:
    name: test tokio full --unstable --taskdump
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2
      # Run `tokio` with "unstable" and "taskdump" cfg flags.
      - name: test tokio full --cfg unstable --cfg taskdump
        run: |
          set -euxo pipefail
          cargo nextest run --all-features
          cargo test --doc --all-features
        working-directory: tokio
        env:
          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings
          # in order to run doctests for unstable features, we must also pass
          # the unstable cfg to RustDoc
          RUSTDOCFLAGS: --cfg tokio_unstable --cfg tokio_taskdump

  test-uring:
    name: test tokio full --cfg tokio_uring
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: Swatinem/rust-cache@v2
      - name: test tokio full --cfg tokio_uring
        run: |
          set -euxo pipefail
          cargo nextest run --all-features
          cargo test --doc --all-features
        working-directory: tokio
        env:
          RUSTFLAGS: --cfg tokio_uring -Dwarnings
          # in order to run doctests for unstable features, we must also pass
          # the unstable cfg to RustDoc
          RUSTDOCFLAGS: --cfg tokio_uring

  check-unstable-mt-counters:
    name: check tokio full --internal-mt-counters
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
            toolchain: ${{ env.rust_stable }}
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest
      - uses: Swatinem/rust-cache@v2
      # Run `tokio` with "unstable" and "taskdump" cfg flags.
      - name: check tokio full --cfg unstable --cfg internal-mt-counters
        run: |
          set -euxo pipefail
          cargo nextest run --all-features
          cargo test --doc --all-features
        working-directory: tokio
        env:
          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_internal_mt_counters -Dwarnings
          # in order to run doctests for unstable features, we must also pass
          # the unstable cfg to RustDoc
          RUSTDOCFLAGS: --cfg tokio_unstable --cfg tokio_internal_mt_counters

  miri-lib:
    name: miri-lib
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_miri_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_miri_nightly }}
          components: miri
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest
      - uses: Swatinem/rust-cache@v2
      - name: miri
        run: |
          cargo miri nextest run --features full --lib --no-fail-fast
        working-directory: tokio
        env:
          MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-strict-provenance -Zmiri-retag-fields

  miri-test:
    name: miri-test
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_miri_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_miri_nightly }}
          components: miri
      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest
      - uses: Swatinem/rust-cache@v2
      - name: miri
        run: |
          cargo miri nextest run --features full --test '*' --no-fail-fast
        working-directory: tokio
        env:
          MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-strict-provenance -Zmiri-retag-fields

  miri-doc:
    name: miri-doc
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_miri_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_miri_nightly }}
          components: miri
      - uses: Swatinem/rust-cache@v2
      - name: miri-doc-test
        run: |
          cargo miri test --doc --all-features --no-fail-fast
        working-directory: tokio
        env:
          MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-strict-provenance -Zmiri-retag-fields

  asan:
    name: asan
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install llvm
        # Required to resolve symbols in sanitizer output
        run: sudo apt-get install -y llvm
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}

      - uses: Swatinem/rust-cache@v2
      - name: asan
        run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 --nocapture
        env:
          RUSTFLAGS: -Z sanitizer=address --cfg tokio_no_tuning_tests
          # Ignore `trybuild` errors as they are irrelevant and flaky on nightly
          TRYBUILD: overwrite

  semver:
    name: semver
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Check `tokio` semver
        uses: obi1kenobi/cargo-semver-checks-action@v2
        with:
          rust-toolchain: ${{ env.rust_stable }}
          package: tokio
          release-type: minor
      - name: Check semver for rest of the workspace
        if: ${{ !startsWith(github.event.pull_request.base.ref, 'tokio-1.') }}
        uses: obi1kenobi/cargo-semver-checks-action@v2
        with:
          rust-toolchain: ${{ env.rust_stable }}
          exclude: tokio
          release-type: minor

  cross-check:
    name: cross-check
    needs: basics
    runs-on: ubuntu-latest
    strategy:
      matrix:
        target:
          - powerpc-unknown-linux-gnu
          - powerpc64-unknown-linux-gnu
          - arm-linux-androideabi
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
          target: ${{ matrix.target }}

      - uses: Swatinem/rust-cache@v2
      - run: cargo check --workspace --all-features --target ${{ matrix.target }}
        env:
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings

  cross-check-tier3:
    name: cross-check-tier3
    needs: basics
    runs-on: ubuntu-latest
    strategy:
      matrix:
        target:
          - name: x86_64-unknown-haiku
          - name: armv7-sony-vita-newlibeabihf
            exclude_features: "process,signal,rt-process-signal,full"
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@nightly
        with:
          toolchain: ${{ env.rust_nightly }}
          components: rust-src
      - name: Install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack
      - uses: Swatinem/rust-cache@v2
      - run: cargo hack check -Zbuild-std --workspace --each-feature --target ${{ matrix.target.name }} --exclude-features "${{ matrix.target.exclude_features }}"
        env:
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings

  cross-test-with-parking_lot:
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - target: i686-unknown-linux-gnu
            os: ubuntu-latest
            rustflags: --cfg tokio_taskdump
          - target: armv5te-unknown-linux-gnueabi
            os: ubuntu-latest
          - target: armv7-unknown-linux-gnueabihf
            os: ubuntu-24.04-arm
          - target: aarch64-unknown-linux-gnu
            os: ubuntu-24.04-arm
            rustflags: --cfg tokio_taskdump
          - target: aarch64-pc-windows-msvc
            os: windows-11-arm
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust stable
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
          target: ${{ matrix.target }}

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: taiki-e/setup-cross-toolchain-action@v1
        with:
          target: ${{ matrix.target }}
          qemu: '7.2'

      - uses: Swatinem/rust-cache@v2
      - name: Tests run with all features (including parking_lot)
        run: |
          set -euxo pipefail
          cargo nextest run -p tokio --all-features --target ${{ matrix.target }}
          cargo test --doc -p tokio --all-features --target ${{ matrix.target }}
        env:
          RUST_TEST_THREADS: 1
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}

  cross-test-without-parking_lot:
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - target: i686-unknown-linux-gnu
            os: ubuntu-latest
            rustflags: --cfg tokio_taskdump
          - target: armv5te-unknown-linux-gnueabi
            os: ubuntu-latest
          - target: armv7-unknown-linux-gnueabihf
            os: ubuntu-24.04-arm
          - target: aarch64-unknown-linux-gnu
            os: ubuntu-24.04-arm
            rustflags: --cfg tokio_taskdump
          - target: aarch64-pc-windows-msvc
            os: windows-11-arm
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust stable
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
          target: ${{ matrix.target }}

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: taiki-e/setup-cross-toolchain-action@v1
        with:
          target: ${{ matrix.target }}
          qemu: '7.2'

      - name: Remove `parking_lot` from `full` feature
        run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml

      - uses: Swatinem/rust-cache@v2
      # The `tokio_no_parking_lot` cfg is here to ensure the `sed` above does not silently break.
      - name: Tests run with all features (without parking_lot)
        run: |
          set -euxo pipefail
          cargo nextest run -p tokio --features full,test-util --target ${{ matrix.target }}
          cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }}
        env:
          RUST_TEST_THREADS: 1
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}

  # See https://github.com/tokio-rs/tokio/issues/5187
  no-atomic-u64-test:
    name: Test tokio --all-features on i686-unknown-linux-gnu without AtomicU64
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
          components: rust-src

      - name: Install cargo-nextest
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-nextest

      - uses: taiki-e/setup-cross-toolchain-action@v1
        with:
          target: i686-unknown-linux-gnu
          qemu: '7.2'

      - uses: Swatinem/rust-cache@v2
      - name: test tokio --all-features
        run: |
          cargo nextest run -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features
          cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features
        env:
          RUST_TEST_THREADS: 1
          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_tuning_tests

  no-atomic-u64-check:
    name: Check tokio --feature-powerset --depth 2 on i686-unknown-linux-gnu without AtomicU64
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
          components: rust-src
      - name: Install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - uses: Swatinem/rust-cache@v2

      # https://github.com/tokio-rs/tokio/pull/5356
      # https://github.com/tokio-rs/tokio/issues/5373
      - name: Check
        run: cargo hack check -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --feature-powerset --depth 2 --keep-going
        env:
          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings

  features:
    name: features ${{ matrix.name }}
    needs: basics
    runs-on: ubuntu-latest
    strategy:
      matrix:
        include:
          - { name: "", rustflags: "" }
          # Try with unstable feature flags
          - { name: "--unstable", rustflags: "--cfg tokio_unstable -Dwarnings" }
          # Try with unstable and taskdump feature flags
          - { name: "--unstable --taskdump", rustflags: "--cfg tokio_unstable -Dwarnings --cfg tokio_taskdump" }
          - { name: "--tokio_uring", rustflags: "-Dwarnings --cfg tokio_uring" }
          - { name: "--unstable --taskdump --tokio_uring", rustflags: "--cfg tokio_unstable -Dwarnings --cfg tokio_taskdump --cfg tokio_uring" }
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
          target: ${{ matrix.target }}
      - name: Install cargo-hack
        uses: taiki-e/install-action@cargo-hack

      - uses: Swatinem/rust-cache@v2
      - name: check --feature-powerset ${{ matrix.name }}
        run: cargo hack check --all --feature-powerset --depth 2 --keep-going
        env:
          RUSTFLAGS: ${{ matrix.rustflags }}

  minrust:
    name: minrust
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_min }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_min }}
      - uses: Swatinem/rust-cache@v2
      - name: "check --workspace --all-features"
        run: |
          if [[ "${{ github.event.pull_request.base.ref }}" =~ ^tokio-1\..* ]]; then
            # Only check `tokio` crate as the PR is backporting to an earlier tokio release.
            cargo check -p tokio --all-features
          else
            # Check all crates in the workspace
            cargo check --workspace --all-features
          fi
        env:
          RUSTFLAGS: "" # remove -Dwarnings

  minimal-versions:
    name: minimal-versions
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
      - name: Install cargo-hack
        uses: taiki-e/install-action@cargo-hack

      - uses: Swatinem/rust-cache@v2
      - name: "check --all-features -Z minimal-versions"
        run: |
          # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update`
          # from determining minimal versions based on dev-dependencies.
          cargo hack --remove-dev-deps --workspace
          # Update Cargo.lock to minimal version dependencies.
          cargo update -Z minimal-versions
          cargo hack check --all-features --ignore-private
      - name: "check --all-features --unstable -Z minimal-versions"
        env:
          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump --cfg tokio_uring -Dwarnings
        run: |
          # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update`
          # from determining minimal versions based on dev-dependencies.
          cargo hack --remove-dev-deps --workspace
          # Update Cargo.lock to minimal version dependencies.
          cargo update -Z minimal-versions
          cargo hack check --all-features --ignore-private

  fmt:
    name: fmt
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
          components: rustfmt
      - uses: Swatinem/rust-cache@v2
      # Check fmt
      - name: "rustfmt --check"
        # Workaround for rust-lang/cargo#7732
        run: |
          if ! rustfmt --check --edition 2021 $(git ls-files '*.rs'); then
            printf "Please run \`rustfmt --edition 2021 \$(git ls-files '*.rs')\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2
            exit 1
          fi

  clippy:
    name: clippy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_clippy }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_clippy }}
          components: clippy
      - uses: Swatinem/rust-cache@v2
      # Run clippy
      - name: "clippy --all"
        run: cargo clippy --all --tests --all-features --no-deps

  docs:
    name: docs
    runs-on: ${{ matrix.run.os }}
    strategy:
      matrix:
        run:
          - os: windows-latest
          - os: ubuntu-latest
            RUSTFLAGS: --cfg tokio_taskdump --cfg tokio_uring
            RUSTDOCFLAGS: --cfg tokio_taskdump --cfg tokio_uring

    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
      - uses: Swatinem/rust-cache@v2
      - name: "doc --lib --all-features"
        run: |
          cargo doc --lib --no-deps --all-features --document-private-items
        env:
          RUSTFLAGS: --cfg docsrs --cfg tokio_unstable ${{ matrix.run.RUSTFLAGS }}
          RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings ${{ matrix.run.RUSTDOCFLAGS }}

  loom-compile:
    name: build loom tests
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
      - uses: Swatinem/rust-cache@v2
      - name: build --cfg loom
        run: cargo test --no-run --lib --features full
        working-directory: tokio
        env:
          RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings

  check-readme:
    name: Check README
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Verify that both READMEs are identical
        run: diff README.md tokio/README.md

      - name: Verify that Tokio version is up to date in README
        working-directory: tokio
        run: grep -q "$(sed '/^version = /!d' Cargo.toml | head -n1)" README.md

  test-hyper:
    name: Test hyper
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}

      - name: Clone hyper
        run: git clone https://github.com/hyperium/hyper.git

      - name: Checkout the latest release because HEAD maybe contains breakage.
        run: |
          set -x
          tag=$(git describe --abbrev=0 --tags)
          git checkout "${tag}"
        working-directory: hyper

      - name: Patch hyper to use tokio from this repository
        run: |
          set -x
          echo '[workspace]' >>Cargo.toml
          echo '[patch.crates-io]' >>Cargo.toml
          echo 'tokio = { path = "../tokio" }' >>Cargo.toml
          echo 'tokio-util = { path = "../tokio-util" }' >>Cargo.toml
          echo 'tokio-stream = { path = "../tokio-stream" }' >>Cargo.toml
          echo 'tokio-test = { path = "../tokio-test" }' >>Cargo.toml
          git diff
        working-directory: hyper

      - uses: Swatinem/rust-cache@v2
        with:
          # The cargo workspaces and target directory configuration.
          # These entries are separated by newlines and have the form
          # `$workspace -> $target`. The `$target` part is treated as a directory
          # relative to the `$workspace` and defaults to "target" if not explicitly given.
          # default: ". -> target"
          workspaces: "./hyper"

      - name: Test hyper
        run: cargo test --features full
        working-directory: hyper

  test-quinn:
    name: Test Quinn
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
          - macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}

      - name: Clone Quinn
        run: git clone https://github.com/quinn-rs/quinn.git

      - name: Checkout the latest release because HEAD maybe contains breakage.
        run: |
          set -x
          tag=$(git describe --abbrev=0 --tags)
          git checkout "${tag}"
        working-directory: quinn

      - name: Patch Quinn to use tokio from this repository
        run: |
          set -x
          echo '[patch.crates-io]' >>Cargo.toml
          echo 'tokio = { path = "../tokio" }' >>Cargo.toml
          git diff
        working-directory: quinn

      - uses: Swatinem/rust-cache@v2
        with:
          # The cargo workspaces and target directory configuration.
          # These entries are separated by newlines and have the form
          # `$workspace -> $target`. The `$target` part is treated as a directory
          # relative to the `$workspace` and defaults to "target" if not explicitly given.
          # default: ". -> target"
          workspaces: "./quinn"

      - name: Test Quinn
        working-directory: quinn
        env:
          RUSTFLAGS: ""
        run: cargo test

  x86_64-fortanix-unknown-sgx:
    name: build tokio for x86_64-fortanix-unknown-sgx
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
          target: x86_64-fortanix-unknown-sgx
      - uses: Swatinem/rust-cache@v2
      # NOTE: Currently the only test we can run is to build tokio with rt and sync features.
      - name: build tokio
        run: cargo build --target x86_64-fortanix-unknown-sgx --features rt,sync
        working-directory: tokio

  check-redox:
    name: build tokio for redox-os
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.rust_nightly }}
          target: x86_64-unknown-redox
      - name: check tokio on redox
        run: cargo check --target x86_64-unknown-redox --all-features
        working-directory: tokio

  wasm32-unknown-unknown:
    name: test tokio for wasm32-unknown-unknown
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
      - name: Install wasm-pack
        uses: taiki-e/install-action@wasm-pack

      - uses: Swatinem/rust-cache@v2
      - name: test tokio
        run: wasm-pack test --node -- --features "macros sync"
        working-directory: tokio

  wasm32-wasip1:
    name: ${{ matrix.target }}
    needs: basics
    runs-on: ubuntu-latest
    strategy:
      matrix:
        target:
          - wasm32-wasip1
          - wasm32-wasip1-threads
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
          targets: ${{ matrix.target }}

      # Install dependencies
      - name: Install cargo-hack, wasmtime
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack,wasmtime

      - uses: Swatinem/rust-cache@v2
      - name: WASI test tokio full
        run: cargo test -p tokio --target ${{ matrix.target }} --features full
        env:
          CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --"
          CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --"
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864

      - name: WASI test tokio-util full
        run: cargo test -p tokio-util --target ${{ matrix.target }} --features full
        env:
          CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --"
          CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --"
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864

      - name: WASI test tokio-stream
        run: cargo test -p tokio-stream --target ${{ matrix.target }} --features time,net,io-util,sync
        env:
          CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --"
          CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --"
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864

      - name: test tests-integration --features wasi-rt
        # TODO: this should become: `cargo hack wasi test --each-feature`
        run: cargo test --target ${{ matrix.target }} --test rt_yield --features wasi-rt
        if: matrix.target == 'wasm32-wasip1'
        working-directory: tests-integration
        env:
          CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --"
          RUSTFLAGS: -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864

      - name: test tests-integration --features wasi-threads-rt
        run: cargo test --target ${{ matrix.target }} --features wasi-threads-rt
        if: matrix.target == 'wasm32-wasip1-threads'
        working-directory: tests-integration
        env:
          CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --"
          RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864

  check-external-types:
    name: check-external-types (${{ matrix.os }})
    needs: basics
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os:
          - windows-latest
          - ubuntu-latest
        rust:
          # `check-external-types` requires a specific Rust nightly version. See
          # the README for details: https://github.com/awslabs/cargo-check-external-types
          - nightly-2024-06-30
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ matrix.rust }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ matrix.rust }}
      - uses: Swatinem/rust-cache@v2
      - name: Install cargo-check-external-types
        uses: taiki-e/cache-cargo-install-action@v1
        with:
          tool: cargo-check-external-types@0.1.13
      - name: check-external-types
        run: cargo check-external-types --all-features
        working-directory: tokio

  check-fuzzing:
    name: check-fuzzing
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_nightly }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_nightly }}
      - uses: Swatinem/rust-cache@v2
      - name: Install cargo-fuzz
        run: cargo install cargo-fuzz
      - name: Check /tokio/
        run: cargo fuzz check --all-features
        working-directory: tokio
      - name: Check /tokio-stream/
        run: cargo fuzz check --all-features
        working-directory: tokio-stream

  check-spelling:
    name: check-spelling
    needs: basics
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust ${{ env.rust_stable }}
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ env.rust_stable }}
      - name: Install cargo-spellcheck
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-spellcheck
      - uses: actions/checkout@v4
      - name: Make sure dictionary words are sorted and unique
        run: |
          FILE="spellcheck.dic"

          # Verify the first line is an integer.
          first_line=$(head -n 1 "$FILE")
          if ! [[ "$first_line" =~ ^[0-9]+$ ]]; then
            echo "Error: The first line of $FILE must be an integer, but got: '$first_line'"
            exit 1
          fi
          expected_count="$first_line"

          # Check that the number of lines matches the integer.
          # xargs (with no arguments) will strip leading/trailing whitespacefrom wc's output.
          actual_count=$(sed '1d' "$FILE" | wc -l | xargs)
          if [ "$expected_count" -ne "$actual_count" ]; then
            echo "Error: The number of lines ($actual_count) does not match $expected_count."
            exit 1
          fi

          # `sed` removes the first line (number of words).
          #
          # `sort` makes sure everything in between is sorted
          # and contains no duplicates.
          #
          # Since `sort` is sensitive to locale, we set it
          # using LC_ALL to en_US.UTF8 to be consistent in different
          # environments.

          (
            sed '1d' $FILE | LC_ALL=en_US.UTF8 sort -uc
          ) || {
            echo "Dictionary is not in sorted order. Correct order is:"
            LC_ALL=en_US.UTF8 sort -u <(sed '1d' $FILE)
            false
          }
      - name: Run cargo-spellcheck
        run: |
          if ! cargo spellcheck --code 1
          then
              echo ''
              echo ''
              echo 'If this is a Rust method/type/variable name, then you should'
              echo 'enclose it in backticks like this: `MyRustType`.'
              echo ''
              echo 'If this is a real word, then you can add it to spellcheck.dic'
              exit 1
          fi
      - name: Detect trailing whitespace
        run: |
          if grep --exclude-dir=.git --exclude-dir=target -rne '\s$' .
          then
              echo ''
              echo 'Please remove trailing whitespace from these lines.'
              exit 1
          fi

  get-latest-kernel-version:
    runs-on: ubuntu-latest
    outputs:
      kernel_version: ${{ steps.fetch.outputs.kernel_version }}
    steps:
      - name: Fetch latest stable kernel
        id: fetch
        run: |
          KERNEL_VERSION=$(curl -s https://www.kernel.org/releases.json | jq -r '.latest_stable.version')
          echo "kernel_version=$KERNEL_VERSION" >> $GITHUB_OUTPUT

  test-io-uring-on-specific-kernel-versions:
    name: Test io_uring on Linux ${{ matrix.kernel_version }}
    needs: [get-latest-kernel-version, basics]
    strategy:
      matrix:
        kernel_version:
          # A latest stable kernel version
          - ${{ needs.get-latest-kernel-version.outputs.kernel_version }}
          # A kernel version that doesn't support io_uring
          - '4.19.325'
    uses: ./.github/workflows/uring-kernel-version-test.yml
    with:
      kernel_version: ${{ matrix.kernel_version }}