Function SetupPipeWriter

cpp/src/arrow/io/file_benchmark.cc:188–193

Set up a pipe with an OutputStream at one end and a BackgroundReader at the other end.

// Set up a pipe with an OutputStream at one end and a BackgroundReader at
// the other end.
static void SetupPipeWriter(std::shared_ptr<io::OutputStream>* stream,
                            std::shared_ptr<BackgroundReader>* reader) {
  auto pipe = *internal::CreatePipe();
  *stream = *io::FileOutputStream::Open(pipe.wfd.Detach());
  *reader = BackgroundReader::StartReader(pipe.rfd.Detach());
}

static void BenchmarkStreamingWrites(benchmark::State& state,
                                     const std::valarray<int64_t>& sizes,