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

        private bool CheckEnqueueHandshake(byte[] buffer, AsyncProtocolRequest asyncRequest)
        {
            LazyAsyncResult lazyResult = null;

            lock (this)
            {
                if (_lockWriteState == LockPendingWrite)
                {
                    return false;
                }

                int lockState = Interlocked.Exchange(ref _lockWriteState, LockHandshake);
                if (lockState != LockWrite)
                {
                    // Proceed with handshake.
                    return false;
                }

                if (asyncRequest != null)
                {
                    asyncRequest.Buffer = buffer;
                    _queuedWriteStateRequest = asyncRequest;
                    return true;
                }

                lazyResult = new LazyAsyncResult(null, null, /*must be*/null);
                _queuedWriteStateRequest = lazyResult;
            }
            lazyResult.InternalWaitForCompletion();
            return false;
        }