feat(util): add SerialJobLane

A FIFO of blocking jobs, run one at a time on a background thread that a
post starts when none is running and that exits once the queue is empty.
Each job returns a completion, and completions run only in pump(), on
the owner's thread. Unlike RPCWorker and AsyncTaskManager nothing ever
joins: abandon() (also run by the destructor) drops queued jobs and
undelivered completions and refuses later posts, and a job stuck in a
blocking call finishes on its own thread. It is meant for backend calls
that can wait out a long scan and may have to be given up. post()
reports a dropped job (abandoned lane, or no thread could be started),
and waitIdle() is bounded.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

This commit is contained in:

DanS

2026-10-09 21:09:48 -05:00

co-authored by

Claude Opus 5.5

parent 296c04386c

commit b2a57a61a0

3 changed files with 222 additions and 0 deletions

									
										CMakeLists.txt
									
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				@@ -709,6 +709,7 @@ set(APP_HEADERS

				    src/data/exchange_info.h

				    src/util/logger.h

				    src/util/async_task_manager.h

				    src/util/serial_job_lane.h

				    src/util/fetch_backoff.h

				    src/util/coalescing_writer.h

				    src/util/background_sampler.h