System.Net.WebSockets.WebSocketBase.EnsureCloseOutputOperation C# (CSharp) Method

        private void EnsureCloseOutputOperation()
        {
            if (_closeOutputOperation == null)
            {
                lock (_thisLock)
                {
                    if (_closeOutputOperation == null)
                    {
                        _closeOutputOperation = new WebSocketOperation.CloseOutputOperation(this);
                    }
                }
            }
        }