System.Net.Security.SslState.FinishHandshakeRead C# (CSharp) Method

        private void FinishHandshakeRead(int newState)
        {
            lock (this)
            {
                // Lock is redundant here. Included for clarity.
                int lockState = Interlocked.Exchange(ref _lockReadState, newState);

                if (lockState != LockPendingRead)
                {
                    return;
                }

                _lockReadState = LockRead;
                object obj = _queuedReadStateRequest;
                if (obj == null)
                {
                    // Other thread did not get under the lock yet.
                    return;
                }

                _queuedReadStateRequest = null;
                if (obj is LazyAsyncResult)
                {
                    ((LazyAsyncResult)obj).InvokeCallback();
                }
                else
                {
                    ThreadPool.QueueUserWorkItem(new WaitCallback(CompleteRequestWaitCallback), obj);
                }
            }
        }