test: stabilize concurrent cancellation test - #10461
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ReubenBond merged 1 commit intoAug 11, 2026
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Wait until every delayed interleaving call has started before cancellation, so grain-side cancellation evidence is guaranteed to exist. Preserve immediate cancellation coverage for the zero-delay case. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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GrainTaskMultipleCancellationscan complete caller-side cancellation before one or more requests begin executing, while its delayed cases later require every request to have recorded cancellation inside the grain. Slower activation after mixed runtime tests exposes that mismatch as a five-minute wait for evidence which can never exist.Add an interleaving start-notification path and wait until all delayed calls have entered the grain before scheduling cancellation. The zero-delay cases continue using the original path so pre-start cancellation remains covered, and the calls remain interleavable so concurrent cancellation behavior is preserved.
This completes the deterministic start barrier introduced for the single-call case in #10319.
Fixes #10432
Microsoft Reviewers: Open in CodeFlow