barrier write logic.

2026-05-22 20:42:18 +07:00
parent f4b650f78f
commit 70f3b19bc5
9 changed files with 874 additions and 6 deletions
@@ -27,6 +27,9 @@ Already implemented:
  admission, deterministic interleaving, item-local overlays, and barrier
  commits.
 - Multi-step concurrent item bodies are supported for fail-only item policy.
+- Barrier write validation rejects ambiguous sibling writes: same-path sibling
+  writes require an explicit non-`replace` reducer, and ancestor/descendant
+  sibling writes are rejected.

 ## Non-Goals For Phase 4

@@ -102,6 +105,10 @@ Key tests:
 - `test_concurrent_foreach_applies_reducer_in_item_index_order`
 - `test_concurrent_foreach_rejects_ancestor_descendant_write_conflict`

+Plan:
+
+- See [`2026-05-22-concurrent-foreach-barrier-write-semantics.md`](2026-05-22-concurrent-foreach-barrier-write-semantics.md).
+
 ## Slice 4: Item Error Policies

 Implement after barrier success commits are correct.