Bo-Yi Wu 7abef361b0 refactor: use single poller with semaphore-based capacity control ...

Previously, capacity=N spawned N independent polling goroutines, each
making FetchTask RPCs to the Gitea server concurrently. This caused
unnecessary connection load on the server proportional to the runner's
capacity setting.

Replace the N-goroutine model with a single polling loop that uses a
buffered channel as a semaphore to control concurrent task execution.
The poller acquires a capacity slot before fetching; when at capacity,
it blocks without issuing RPCs. Fetched tasks are dispatched to
independent goroutines that release their slot on completion.

Also fix a pre-existing bug in Shutdown() where the timeout branch
used a blocking receive on p.done instead of a non-blocking select,
which prevented shutdownJobs() from ever being called on timeout.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-18 11:40:53 +08:00

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