kshitijk4poor
dcfdc8deec
fix(deadline): document the inline-mark contract; pin the ordering invariants (Phase 3a salvage round)
...
Record correction: the previous commit's message says the async flavor
offloads mark_suspect via asyncio.to_thread — it does NOT (and must not).
The mark is deliberately inline on the event loop: running it
synchronously guarantees mark-happens-before-BoundedResult-return and
mark-before-on_abandon-cleanup (cleanup is ensure_future'd and cannot
start until the next loop tick). An offloaded mark would race both.
The trade-off is that a slow adopter mark_suspect would block the loop
(measured: a 2s mark stalls every coroutine for 2.003s), so the adopter
contract is now explicit in the Protocol docstring and at the async call
site: mark_suspect must be cheap, non-blocking, lock-free; expensive
recycle work belongs in ensure_healthy.
New pins so the negotiated semantics can't silently regress:
- test_sync_mark_happens_before_on_timeout (the review-round ordering)
- test_async_mark_happens_before_on_abandon_cleanup (the scheduling
invariant an offloaded mark would break)
- test_sync_completion_never_marks_backend (sync counterpart of the
async completion test)
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