BitSharper.Threading.Locks.ReentrantLock.FairSync.GetSignallee C# (CSharp) Method

            private WaitNode GetSignallee(Thread caller)
            {
                lock (this)
                {
                    if (caller != _owner)
                    {
                        throw new SynchronizationLockException("Not owner");
                    }
                    if (_holds >= 2) // current thread will keep the lock
                    {
                        --_holds;
                        return null;
                    }
                    var w = _wq.Dequeue();
                    if (w == null) // if none, clear for new arrivals
                    {
                        _owner = null;
                        _holds = 0;
                    }
                    return w;
                }
            }