---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-21T02:35:37Z
git_ref: ae6f2ac3
diff_cmd: git diff HEAD~1..HEAD
---

Replace the actor-cancel timeout watcher/status experiment with one
explicit absolute deadline threaded through the existing private call
path. Do not use a `ContextVar`, shared result state, waiter
coalescing, or polling tasks.

> `git diff HEAD~1..HEAD -- tractor/runtime/_portal.py`

`Portal.cancel_actor()` computes one absolute deadline and uses it for
both `Start` frame publication and the subsequent cancel-ack wait.

> `git diff HEAD~1..HEAD -- tractor/runtime/_runtime.py`

> `git diff HEAD~1..HEAD -- tractor/ipc/_chan.py`

The private RPC path forwards the operation-specific deadline. Lower
layers preserve the ordinary infinite-deadline call shape.

> `git diff HEAD~1..HEAD -- tractor/ipc/_transport.py`

`MsgpackTransport.send()` applies the deadline inside its complete-frame
shield. If the deadline expires after partial publication, it closes
the unusable stream before releasing the send lock.

> `git diff HEAD~1..HEAD -- tests/ipc/test_each_tpt.py`

> `git diff HEAD~1..HEAD -- tests/test_to_actor.py`

Focused regressions prove a partial-frame timeout closes the stream and
that actor-cancel publication and acknowledgement share one budget.

The implementation removes the earlier `_SendStatus`, watcher task,
coalescing, shared cancel result, and per-waiter state. Four focused
transport and actor-cancel tests pass.