Axel Uhl ec320f9fef
bug6302: fix RacingEventService deadlock in new-race-tracker path ...
Two related fixes for the permanent hang where a request thread held the
raceTrackersByRegatta write lock while parked in Object.wait(), timing out all
subsequent requests to the service.
TrackedRaceImpl.waitForAllRaceLogsAttached(): the wait guard re-evaluates the
live attached-race-log count inside the synchronized(latchForRaceLogs) block
instead of a stale local captured before entering the monitor. The stale local
could never change, so a notifyAll() that fired between the initial read and
entering wait() was lost, parking the thread forever (classic lost-wakeup).
RacingEventServiceImpl.addRace(...): split the register-or-notify handshake so
that only *claiming* (removing) the callbacks for the new tracker happens under
the raceTrackersByRegatta write lock, atomically with publishing the tracker;
the callbacks are then *invoked* after the lock is released. A callback may
block during tracker startup (waiting for race logs to attach), and previously
that wait ran while holding the global write lock, turning a single stalled
tracker into a service-wide outage. The read-locked find-or-enqueue in
getRaceTrackerByRegattaAndRaceIdentifier(...) still races atomically against the
claim, so no callback can be lost.
Assisted-By: Claude Opus 4.8
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Axel Uhl
ec320f9fef