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[1.9.x] Prune FileLockNamedLock thread entries that hold no step - #2303
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threadSteps kept an entry for every thread that ever used the lock, including threads whose attempt timed out, for the lock's lifetime.
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November 8, 2026 22:39
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LGTM. Correct thread-entry cleanup for FileLockNamedLock. Synchronization is sound — forgetThreadWithoutSteps() acquires the same criticalRegion lock guarding all threadSteps access, and only the owning thread ever modifies its own entry, so no race is possible. The doUnlock removal-before-check reordering is semantically equivalent to the old code because anyOtherThreadHasSteps() already excluded the current thread.
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FileLockNamedLock.threadStepskept an entry for every thread that ever used the lock, including threads whose attempt timed out, so it retainedThreadobjects for the lock's lifetime. Entries are now removed when a thread's step stack empties or its attempt fails. Same change as theFileLockNamedLockpart of #2300 on master.