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master: 86%

Ran 26 Jul 2026 02:41PM UTC

Files 7

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Committed 26 Jul 2026 02:39PM UTC coverage: 84.336% (+0.3%) from 84.017%

Job # 30206523120.5

Build Type

push

github

Committed by

Tieske

Commit Message

fix(semaphore): stop leaking resources to canceled queue waiters

Same root cause as the copas.lock deadlock (#199): semaphore:give()
deducted a queued waiter's requested resources from the pool and then
called copas.wakeup() without checking whether it actually resumed
the coroutine. If that waiter had been canceled externally (eg. via
copas.removethread()/future:cancel()) while queued, the resources
were permanently subtracted from the pool even though the canceled
coroutine never runs to consume or return them - silently shrinking
the semaphore's effective capacity forever, and starving any real
waiter still queued behind it.

give() now only deducts the resources once copas.wakeup() confirms
the waiter actually resumed; a stale/canceled entry is dropped without
touching the count, and the loop continues to the next waiter in line.

Coverage Stats

1416 of 1679 relevant lines covered (84.34%)

5845.84 hits per line

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master: 86%

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master: 86%

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