Microsoft.Common.Core.Logging.FileLogWriter.WriteBuffer C# (CSharp) Method

        private async Task WriteBuffer(string message, bool flush) {
            await _semaphore.WaitAsync();
            try {
                _sb.Append(message);
                if (_sb.Length > _maxBufferSize || flush) {
                    using (var stream = File.AppendText(_filePath)) {
                        await stream.WriteAsync(_sb.ToString());
                    }
                    _sb.Clear();
                }
            } finally {
                _semaphore.Release();
            }
        }