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656a84e180
The generic unlock() wrote to m_write_locked from every thread regardless of whether a read or write lock was held. When multiple threads held concurrent read locks, their unlock() calls would race on the non-atomic m_write_locked and m_read_locked_with_write_lock fields. Split unlock() into unlock_read() and unlock_write() so that read unlocks never touch the write-lock tracking fields. The RWLockLocker template dispatches at compile time based on LockMode.