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Change memory ordering in System wrapper example #106599

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Apr 27, 2023
Merged

Change memory ordering in System wrapper example #106599

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8 changes: 4 additions & 4 deletions library/std/src/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ pub use alloc_crate::alloc::*;
///
/// ```rust
/// use std::alloc::{System, GlobalAlloc, Layout};
/// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
/// use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};
///
/// struct Counter;
///
Expand All @@ -103,22 +103,22 @@ pub use alloc_crate::alloc::*;
/// unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
/// let ret = System.alloc(layout);
/// if !ret.is_null() {
/// ALLOCATED.fetch_add(layout.size(), SeqCst);
/// ALLOCATED.fetch_add(layout.size(), Relaxed);
/// }
/// ret
/// }
///
/// unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
/// System.dealloc(ptr, layout);
/// ALLOCATED.fetch_sub(layout.size(), SeqCst);
/// ALLOCATED.fetch_sub(layout.size(), Relaxed);
/// }
/// }
///
/// #[global_allocator]
/// static A: Counter = Counter;
///
/// fn main() {
/// println!("allocated bytes before main: {}", ALLOCATED.load(SeqCst));
/// println!("allocated bytes before main: {}", ALLOCATED.load(Relaxed));
/// }
/// ```
///
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