Merge #914

914: 0.8: Prepare for the next release r=taiki-e a=taiki-e

Backports #913 and CI-related patches.

Changes:
- crossbeam-epoch 0.8.11 -> 0.8.12
  - Removes the dependency on the `once_cell` crate to restore the MSRV. (#913)
  - Work around [rust-lang#98302](rust-lang/rust#98302), which causes compile error on windows-gnu when LTO is enabled. (#913)
- crossbeam-utils 0.8.11 -> 0.8.12
  - Removes the dependency on the `once_cell` crate to restore the MSRV. (#913)
  - Work around [rust-lang#98302](rust-lang/rust#98302), which causes compile error on windows-gnu when LTO is enabled. (#913)

Co-authored-by: Taiki Endo <[email protected]>

Author: bors[bot]

.clippy.toml

@@ -58,9 +58,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
-        run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
       - name: Install cross
         uses: taiki-e/install-action@cross
         if: matrix.target != ''
@@ -80,8 +80,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
       - name: Check features
@@ -92,10 +93,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update nightly && rustup default nightly
+      - uses: dtolnay/rust-toolchain@nightly
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
+      - name: Install cargo-minimal-versions
+        uses: taiki-e/install-action@cargo-minimal-versions
       - name: dependency tree check
         run: ./ci/dependencies.sh
 
@@ -107,8 +109,7 @@ jobs:
       pull-requests: write
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update nightly && rustup default nightly
+      - uses: dtolnay/rust-toolchain@nightly
       - run: ci/no_atomic.sh
       - run: git add -N . && git diff --exit-code
         if: github.repository_owner != 'crossbeam-rs' || github.event_name != 'schedule'
@@ -140,28 +141,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update stable
+      - uses: dtolnay/rust-toolchain@stable
       - name: rustfmt
         run: ./ci/rustfmt.sh
 
-  # Check clippy.
-  clippy:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update stable
-      - name: clippy
-        run: ./ci/clippy.sh
+  # This branch no longer actively developed. Most commits to this
+  # branch are backporting and should not be blocked by clippy.
+  # # Check clippy.
+  # clippy:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v3
+  #     - uses: dtolnay/rust-toolchain@stable
+  #     - name: clippy
+  #       run: ./ci/clippy.sh
 
   # Run miri.
   miri:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup toolchain install nightly --component miri && rustup default nightly
+      - uses: dtolnay/rust-toolchain@miri
       - name: miri
         run: ./ci/miri.sh
 
@@ -170,8 +170,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update nightly && rustup default nightly
+      - uses: dtolnay/rust-toolchain@nightly
       - name: Run sanitizers
         run: ./ci/san.sh
 
@@ -180,8 +179,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update stable
+      - uses: dtolnay/rust-toolchain@stable
       - name: loom
         run: ./ci/crossbeam-epoch-loom.sh
 
@@ -190,8 +188,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install Rust
-        run: rustup update nightly && rustup default nightly
+      - uses: dtolnay/rust-toolchain@nightly
       - name: docs
         run: ./ci/docs.sh
 
@@ -218,11 +215,12 @@ jobs:
       - dependencies
       - codegen
       - rustfmt
-      - clippy
+      # - clippy
       - miri
       - san
       - loom
       - docs
+      - shellcheck
     runs-on: ubuntu-latest
     steps:
       - name: Mark the job as a success

.github/workflows/ci.yml

@@ -9,10 +9,6 @@ on:
       - crossbeam-[0-9]+.*
       - crossbeam-[a-z]+-[0-9]+.*
 
-env:
-  RUSTFLAGS: -Dwarnings
-  RUST_BACKTRACE: 1
-
 defaults:
   run:
     shell: bash

.github/workflows/release.yml

@@ -7,10 +7,4 @@ cargo tree
 cargo tree --duplicate
 
 # Check minimal versions.
-# 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 -Zminimal-versions
-cargo tree
-cargo hack check --all --all-features --exclude benchmarks
+cargo minimal-versions build --workspace --all-features --exclude benchmarks

ci/dependencies.sh

@@ -5,4 +5,4 @@ cd "$(dirname "$0")"/..
 
 rustup component add rustfmt
 
-cargo fmt --all -- --check
+cargo fmt --all --check

ci/rustfmt.sh

@@ -160,7 +160,7 @@ pub fn bounded<T>(cap: usize) -> (Sender<T>, Receiver<T>) {
 /// let ms = |ms| Duration::from_millis(ms);
 ///
 /// // Returns `true` if `a` and `b` are very close `Instant`s.
-/// let eq = |a, b| a + ms(50) > b && b + ms(50) > a;
+/// let eq = |a, b| a + ms(60) > b && b + ms(60) > a;
 ///
 /// let start = Instant::now();
 /// let r = after(ms(100));

crossbeam-channel/src/channel.rs

@@ -9,7 +9,7 @@
 //!   - https://golang.org/LICENSE
 //!   - https://golang.org/PATENTS
 
-#![allow(clippy::mutex_atomic, clippy::redundant_clone)]
+#![allow(clippy::redundant_clone)]
 
 use std::alloc::{GlobalAlloc, Layout, System};
 use std::any::Any;

crossbeam-channel/tests/golang.rs

@@ -229,6 +229,7 @@ fn default_when_disconnected() {
 }
 
 #[test]
+#[cfg_attr(miri, ignore)] // this test makes timing assumptions, but Miri is so slow it violates them
 fn default_only() {
     let start = Instant::now();
 

crossbeam-channel/tests/ready.rs

@@ -95,7 +95,6 @@
     rust_2018_idioms,
     unreachable_pub
 )]
-#![allow(clippy::question_mark)] // https://github.com/rust-lang/rust-clippy/issues/8281
 #![cfg_attr(not(feature = "std"), no_std)]
 
 use cfg_if::cfg_if;

crossbeam-deque/src/lib.rs

@@ -1,3 +1,8 @@
+# Version 0.9.11
+
+- Removes the dependency on the `once_cell` crate to restore the MSRV. (#913)
+- Work around [rust-lang#98302](https://github.com/rust-lang/rust/issues/98302), which causes compile error on windows-gnu when LTO is enabled. (#913)
+
 # Version 0.9.10
 
 - Bump the minimum supported Rust version to 1.38. (#877)

crossbeam-epoch/CHANGELOG.md

@@ -4,7 +4,7 @@ name = "crossbeam-epoch"
 # - Update CHANGELOG.md
 # - Update README.md
 # - Create "crossbeam-epoch-X.Y.Z" git tag
-version = "0.9.10"
+version = "0.9.11"
 edition = "2018"
 rust-version = "1.38"
 license = "MIT OR Apache-2.0"
@@ -19,7 +19,7 @@ default = ["std"]
 
 # Enable to use APIs that require `std`.
 # This is enabled by default.
-std = ["alloc", "crossbeam-utils/std", "once_cell"]
+std = ["alloc", "crossbeam-utils/std"]
 
 # Enable to use APIs that require `alloc`.
 # This is enabled by default and also enabled if the `std` feature is enabled.
@@ -48,7 +48,6 @@ autocfg = "1"
 [dependencies]
 cfg-if = "1"
 memoffset = "0.6"
-once_cell = { version = "1", optional = true }
 scopeguard = { version = "1.1", default-features = false }
 
 # Enable the use of loom for concurrency testing.

crossbeam-epoch/Cargo.toml

@@ -8,22 +8,30 @@ use crate::collector::{Collector, LocalHandle};
 use crate::guard::Guard;
 use crate::primitive::thread_local;
 #[cfg(not(crossbeam_loom))]
-use once_cell::sync::Lazy;
+use crate::sync::once_lock::OnceLock;
 
-/// The global data for the default garbage collector.
-#[cfg(not(crossbeam_loom))]
-static COLLECTOR: Lazy<Collector> = Lazy::new(Collector::new);
-// FIXME: loom does not currently provide the equivalent of Lazy:
-// https://github.com/tokio-rs/loom/issues/263
-#[cfg(crossbeam_loom)]
-loom::lazy_static! {
-    /// The global data for the default garbage collector.
-    static ref COLLECTOR: Collector = Collector::new();
+fn collector() -> &'static Collector {
+    #[cfg(not(crossbeam_loom))]
+    {
+        /// The global data for the default garbage collector.
+        static COLLECTOR: OnceLock<Collector> = OnceLock::new();
+        COLLECTOR.get_or_init(Collector::new)
+    }
+    // FIXME: loom does not currently provide the equivalent of Lazy:
+    // https://github.com/tokio-rs/loom/issues/263
+    #[cfg(crossbeam_loom)]
+    {
+        loom::lazy_static! {
+            /// The global data for the default garbage collector.
+            static ref COLLECTOR: Collector = Collector::new();
+        }
+        &COLLECTOR
+    }
 }
 
 thread_local! {
     /// The per-thread participant for the default garbage collector.
-    static HANDLE: LocalHandle = COLLECTOR.register();
+    static HANDLE: LocalHandle = collector().register();
 }
 
 /// Pins the current thread.
@@ -40,7 +48,7 @@ pub fn is_pinned() -> bool {
 
 /// Returns the default global collector.
 pub fn default_collector() -> &'static Collector {
-    &COLLECTOR
+    collector()
 }
 
 #[inline]
@@ -50,7 +58,7 @@ where
 {
     HANDLE
         .try_with(|h| f(h))
-        .unwrap_or_else(|_| f(&COLLECTOR.register()))
+        .unwrap_or_else(|_| f(&collector().register()))
 }
 
 #[cfg(all(test, not(crossbeam_loom)))]

crossbeam-epoch/src/default.rs

@@ -107,7 +107,7 @@ mod primitive {
         // https://github.com/tokio-rs/loom#handling-loom-api-differences
         impl<T> UnsafeCell<T> {
             #[inline]
-            pub(crate) fn new(data: T) -> UnsafeCell<T> {
+            pub(crate) const fn new(data: T) -> UnsafeCell<T> {
                 UnsafeCell(::core::cell::UnsafeCell::new(data))
             }
 

crossbeam-epoch/src/lib.rs

@@ -1,4 +1,7 @@
 //! Synchronization primitives.
 
 pub(crate) mod list;
+#[cfg(feature = "std")]
+#[cfg(not(crossbeam_loom))]
+pub(crate) mod once_lock;
 pub(crate) mod queue;

crossbeam-epoch/src/sync/mod.rs

@@ -0,0 +1 @@
+../../../crossbeam-utils/src/sync/once_lock.rs

crossbeam-epoch/src/sync/once_lock.rs

@@ -1,4 +1,4 @@
-#![allow(clippy::mutex_atomic, clippy::redundant_clone)]
+#![allow(clippy::redundant_clone)]
 
 use std::ops::Bound;
 use std::sync::atomic::{AtomicUsize, Ordering};

crossbeam-skiplist/tests/base.rs

@@ -1,5 +1,3 @@
-#![allow(clippy::mutex_atomic)]
-
 use std::{iter, ops::Bound, sync::Barrier};
 
 use crossbeam_skiplist::SkipMap;

crossbeam-skiplist/tests/map.rs

@@ -1,3 +1,8 @@
+# Version 0.8.12
+
+- Removes the dependency on the `once_cell` crate to restore the MSRV. (#913)
+- Work around [rust-lang#98302](https://github.com/rust-lang/rust/issues/98302), which causes compile error on windows-gnu when LTO is enabled. (#913)
+
 # Version 0.8.11
 
 - Bump the minimum supported Rust version to 1.38. (#877)

crossbeam-utils/CHANGELOG.md

@@ -4,7 +4,7 @@ name = "crossbeam-utils"
 # - Update CHANGELOG.md
 # - Update README.md
 # - Create "crossbeam-utils-X.Y.Z" git tag
-version = "0.8.11"
+version = "0.8.12"
 edition = "2018"
 rust-version = "1.38"
 license = "MIT OR Apache-2.0"
@@ -19,7 +19,7 @@ default = ["std"]
 
 # Enable to use APIs that require `std`.
 # This is enabled by default.
-std = ["once_cell"]
+std = []
 
 # These features are no longer used.
 # TODO: remove in the next major version.
@@ -32,7 +32,6 @@ nightly = []
 
 [dependencies]
 cfg-if = "1"
-once_cell = { version = "1", optional = true }
 
 # Enable the use of loom for concurrency testing.
 #

crossbeam-utils/Cargo.toml

@@ -39,9 +39,9 @@ use core::ops::{Deref, DerefMut};
 /// let addr1 = &*array[0] as *const i8 as usize;
 /// let addr2 = &*array[1] as *const i8 as usize;
 ///
-/// assert!(addr2 - addr1 >= 64);
-/// assert_eq!(addr1 % 64, 0);
-/// assert_eq!(addr2 % 64, 0);
+/// assert!(addr2 - addr1 >= 32);
+/// assert_eq!(addr1 % 32, 0);
+/// assert_eq!(addr2 % 32, 0);
 /// ```
 ///
 /// When building a concurrent queue with a head and a tail index, it is wise to place them in

crossbeam-utils/src/cache_padded.rs

@@ -4,6 +4,8 @@
 //! * [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.
 //! * [`WaitGroup`], for synchronizing the beginning or end of some computation.
 
+#[cfg(not(crossbeam_loom))]
+mod once_lock;
 mod parker;
 #[cfg(not(crossbeam_loom))]
 mod sharded_lock;