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Ran 12 Jul 2026 08:02PM UTC

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Build # 29206886536

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push

github

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web-flow

Commit Message

Fix CapacityLimiter over-granting tokens on asyncio (#1172)

On the asyncio backend, releasing a token notified the next waiter but did not reserve the token for it until that waiter resumed. A non-blocking acquire issued in that window saw an empty wait queue and a borrower count
below the limit, so it slipped through, leaving borrowed_tokens greater than total_tokens and available_tokens negative.

Reserve the freed token for the woken waiter the moment its event is set (in _notify_next_waiter and when increasing total_tokens), mirroring the Semaphore/Lock hand-off, so the non-blocking acquire correctly raises
WouldBlock. The woken waiter no longer re-adds itself on resume, and a waiter cancelled after being granted the token now releases it to the next in line.

Fixes #1170.

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Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>

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