System.Net.WebSockets.WebSocketBase.EnsureReceiveOperation C# (CSharp) 메소드

        private void EnsureReceiveOperation()
        {
            if (_receiveOperation == null)
            {
                lock (_thisLock)
                {
                    if (_receiveOperation == null)
                    {
                        _receiveOperation = new WebSocketOperation.ReceiveOperation(this);
                    }
                }
            }
        }