Refactor semaphore._Watch
into general-purpose Deadline
utility
#7238
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This PR extracts some changes from #7184 into a stand-alone PR. The
Deadline
utility can be used in multiple places where timeout-based cancellation of pipelined operations is desired. For example,Worker.close
currently uses its timeout to limit the duration of individual operations which makes it impossible to estimate (or limit) its own total duration.Note
I'm not entirely sure where to best put this,
distributed.utils
feels overused and a dedicated new module feels like a bit too much for this. We may want to drop the private scope, but I'd leave it for now to avoid over-exposing API details.pre-commit run --all-files
cc @fjetter