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Auto merge of #100023 - saethlin:send-sync-chunksmut, r=m-ou-se

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Add back Send and Sync impls on ChunksMut iterators

Fixes https://github.com/rust-lang/rust/issues/100014

These were accidentally removed in #94247 because the representation was changed from `&mut [T]` to `*mut T`, which has `!Send + !Sync`.
This commit is contained in:
bors 2022-08-03 13:17:58 +00:00
commit 04f72f9538
2 changed files with 45 additions and 0 deletions
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24
library/core/src/slice/iter.rs
View File

@ -1788,6 +1788,12 @@ unsafe impl<'a, T> TrustedRandomAccessNoCoerce for ChunksMut<'a, T> {
const MAY_HAVE_SIDE_EFFECT: bool = false;
}
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T> Send for ChunksMut<'_, T> where T: Send {}
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T> Sync for ChunksMut<'_, T> where T: Sync {}
/// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a
/// time), starting at the beginning of the slice.
///
@ -2114,6 +2120,12 @@ unsafe impl<'a, T> TrustedRandomAccessNoCoerce for ChunksExactMut<'a, T> {
const MAY_HAVE_SIDE_EFFECT: bool = false;
}
#[stable(feature = "chunks_exact", since = "1.31.0")]
unsafe impl<T> Send for ChunksExactMut<'_, T> where T: Send {}
#[stable(feature = "chunks_exact", since = "1.31.0")]
unsafe impl<T> Sync for ChunksExactMut<'_, T> where T: Sync {}
/// A windowed iterator over a slice in overlapping chunks (`N` elements at a
/// time), starting at the beginning of the slice
///
@ -2835,6 +2847,12 @@ unsafe impl<'a, T> TrustedRandomAccessNoCoerce for RChunksMut<'a, T> {
const MAY_HAVE_SIDE_EFFECT: bool = false;
}
#[stable(feature = "rchunks", since = "1.31.0")]
unsafe impl<T> Send for RChunksMut<'_, T> where T: Send {}
#[stable(feature = "rchunks", since = "1.31.0")]
unsafe impl<T> Sync for RChunksMut<'_, T> where T: Sync {}
/// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a
/// time), starting at the end of the slice.
///
@ -3168,6 +3186,12 @@ unsafe impl<'a, T> TrustedRandomAccessNoCoerce for RChunksExactMut<'a, T> {
const MAY_HAVE_SIDE_EFFECT: bool = false;
}
#[stable(feature = "rchunks", since = "1.31.0")]
unsafe impl<T> Send for RChunksExactMut<'_, T> where T: Send {}
#[stable(feature = "rchunks", since = "1.31.0")]
unsafe impl<T> Sync for RChunksExactMut<'_, T> where T: Sync {}
#[doc(hidden)]
#[unstable(feature = "trusted_random_access", issue = "none")]
unsafe impl<'a, T> TrustedRandomAccess for Iter<'a, T> {}

21
library/core/tests/slice.rs
View File

@ -1191,6 +1191,27 @@ fn test_rchunks_exact_mut_zip() {
assert_eq!(v1, [0, 16, 17, 22, 23]);
}
#[test]
fn chunks_mut_are_send_and_sync() {
use std::cell::Cell;
use std::slice::{ChunksExactMut, ChunksMut, RChunksExactMut, RChunksMut};
use std::sync::MutexGuard;
#[allow(unused)]
fn assert_send_and_sync()
where
ChunksMut<'static, Cell<i32>>: Send,
ChunksMut<'static, MutexGuard<'static, u32>>: Sync,
ChunksExactMut<'static, Cell<i32>>: Send,
ChunksExactMut<'static, MutexGuard<'static, u32>>: Sync,
RChunksMut<'static, Cell<i32>>: Send,
RChunksMut<'static, MutexGuard<'static, u32>>: Sync,
RChunksExactMut<'static, Cell<i32>>: Send,
RChunksExactMut<'static, MutexGuard<'static, u32>>: Sync,
{
}
}
#[test]
fn test_windows_count() {
let v: &[i32] = &[0, 1, 2, 3, 4, 5];