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+---
+title: Checkpoint 2026-09-30 09:28:54 UTC [3c19908d0f]
+type: checkpoint
+permalink: main/projects/25464650-ed5d-440e-b362-190f2852d451/checkpoint-2026-09-30-09-28-54-utc-3c19908d0f
+stable_id: 0013a18c-bf1b-40b5-a9cb-bbd3ad6e6848
+scope: project
+memory_type: checkpoint
+project_id: 25464650-ed5d-440e-b362-190f2852d451
+usage_profile_id: 0c9feb46-d06e-43cd-9ef0-c5813c84a998
+status: active
+revision: 1
+request_id: r3-67-queue-close-deadlock-20260930
+created_at: '2026-09-30T09:28:54.981235+00:00'
+updated_at: '2026-09-30T09:28:54.981235+00:00'
+tags:
+- ready-to-merge
+- r3-03
+- issue-67
+---
+
+# 检查点：R3-03 / issue #67 写队列 Close 死锁已修
+
+## 完成
+- 分支 `feat/fix-r3-67-queue`，工作树 `E:/code/NixMsg-wt/r3-67`（非主工作树）
+- HEAD `eb4cb7c655e5bb6796c2514aaa4a714d0b4c3b3e`：`fix: 写队列满时 Close 不再与 enqueue 死锁`
+- 已推送 origin；已在 Gitea #67 评论（comment 485）
+- 未合 main
+
+## 关键实现
+- `Queue.closing`：Close 先 Swap(closed)+close(closing)，唤醒持读锁堵在满通道上的 enqueue
+- enqueue 的 select 同时等 q.ch / closing / ctx.Done()
+- 再 sendMu.Lock 后 close(q.ch)，等 loop 退出；不向已关闭 channel 发送
+- DEVIATIONS 末尾 `### 复审修复 R3-03`
+
+## 验证
+- `go test ./internal/store/ -count=1 -run "Queue|WriteQueue"` 通过
+- 新增：满通道+堵住写端时 Close 能解开 enqueue；超时 Drain 短时返回
+
+## 下一步
+- 总控审阅后 ff-only 合入 main
+
+## 给下个会话
+- 只改了 queue.go / queue_test.go / DEVIATIONS R3-03；不改迁移