114 lines
2.3 KiB
Rust
114 lines
2.3 KiB
Rust
use std::cell::Cell;
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use std::mem;
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use crossbeam_utils::CachePadded;
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#[test]
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fn default() {
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let x: CachePadded<u64> = Default::default();
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assert_eq!(*x, 0);
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}
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#[test]
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fn store_u64() {
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let x: CachePadded<u64> = CachePadded::new(17);
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assert_eq!(*x, 17);
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}
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#[test]
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fn store_pair() {
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let x: CachePadded<(u64, u64)> = CachePadded::new((17, 37));
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assert_eq!(x.0, 17);
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assert_eq!(x.1, 37);
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}
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#[test]
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fn distance() {
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let arr = [CachePadded::new(17u8), CachePadded::new(37u8)];
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let a = &*arr[0] as *const u8;
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let b = &*arr[1] as *const u8;
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let align = mem::align_of::<CachePadded<()>>();
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assert!(align >= 32);
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assert_eq!(unsafe { a.add(align) }, b);
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}
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#[test]
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fn different_sizes() {
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CachePadded::new(17u8);
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CachePadded::new(17u16);
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CachePadded::new(17u32);
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CachePadded::new([17u64; 0]);
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CachePadded::new([17u64; 1]);
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CachePadded::new([17u64; 2]);
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CachePadded::new([17u64; 3]);
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CachePadded::new([17u64; 4]);
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CachePadded::new([17u64; 5]);
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CachePadded::new([17u64; 6]);
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CachePadded::new([17u64; 7]);
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CachePadded::new([17u64; 8]);
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}
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#[test]
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fn large() {
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let a = [17u64; 9];
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let b = CachePadded::new(a);
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assert!(mem::size_of_val(&a) <= mem::size_of_val(&b));
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}
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#[test]
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fn debug() {
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assert_eq!(
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format!("{:?}", CachePadded::new(17u64)),
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"CachePadded { value: 17 }"
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);
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}
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#[test]
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fn drops() {
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let count = Cell::new(0);
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struct Foo<'a>(&'a Cell<usize>);
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impl<'a> Drop for Foo<'a> {
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fn drop(&mut self) {
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self.0.set(self.0.get() + 1);
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}
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}
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let a = CachePadded::new(Foo(&count));
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let b = CachePadded::new(Foo(&count));
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assert_eq!(count.get(), 0);
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drop(a);
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assert_eq!(count.get(), 1);
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drop(b);
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assert_eq!(count.get(), 2);
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}
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#[allow(clippy::clone_on_copy)] // This is intentional.
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#[test]
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fn clone() {
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let a = CachePadded::new(17);
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let b = a.clone();
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assert_eq!(*a, *b);
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}
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#[test]
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fn runs_custom_clone() {
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let count = Cell::new(0);
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struct Foo<'a>(&'a Cell<usize>);
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impl<'a> Clone for Foo<'a> {
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fn clone(&self) -> Foo<'a> {
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self.0.set(self.0.get() + 1);
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Foo::<'a>(self.0)
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}
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}
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let a = CachePadded::new(Foo(&count));
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let _ = a.clone();
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assert_eq!(count.get(), 1);
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}
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