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update 'allocation' docs with memory atomicity requirement #158586

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rust-bors merged 1 commit into from
Jul 18, 2026
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update 'allocation' docs with memory atomicity requirement #158586

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5 changes: 5 additions & 0 deletions library/core/src/ptr/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,11 @@
//! Allocations must behave like "normal" memory: in particular, reads must not have
//! side-effects, and writes must become visible to other threads using the usual synchronization
//! primitives.
//! Allocations must support all atomic operations that are available for the target (as
//! determined by the `target_has_atomic*` set of cfg flags).
//! The precise instructions used for atomic operations are generally not guaranteed, so portable
//! software should place all Rust allocations in memory regions that support all atomic
//! instructions.
//!
//! For any allocation with `base` address, `size`, and a set of
//! `addresses`, the following are guaranteed:
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