Individual skill

memory-model

Use when choosing memory orderings for C++ or Rust atomics, reasoning about happens-before, writing lock-free patterns, or diagnosing data races. Not for lock-based design: use kernel-concurrency.

.devin/skills/memory-model/SKILL.md

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License: Apache-2.0

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# Memory model

Atomics without a memory ordering argument are guesses. The C++ and Rust models are the same model: pick the weakest ordering that proves the happens-before edge the algorithm needs, and justify it in a comment.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task selects `memory_order` values or Rust `Ordering`s, explains a synchronization edge, writes lock-free code, or reads TSan output on a race. |
| Authority | Read-only. The skill explains and drafts; edits land through the normal coding path. No remote mutation. |
| Side effect | None. |
| Done | Every atomic operation in the reviewed code carries an ordering justified by the synchronization edge it creates, or a race is named with the edge that is missing. |

## Inputs