Method Resize

cpp/src/arrow/io/file.cc:779–786

}

Status MemoryMappedFile::Resize(int64_t new_size) {
  RETURN_NOT_OK(memory_map_->CheckClosed());
  std::unique_lock<std::mutex> write_guard(memory_map_->write_lock(), std::defer_lock);
  std::unique_lock<std::mutex> resize_guard(memory_map_->resize_lock(), std::defer_lock);
  std::lock(write_guard, resize_guard);
  RETURN_NOT_OK(memory_map_->Resize(new_size));
  return Status::OK();
}

int MemoryMappedFile::file_descriptor() const { return memory_map_->fd(); }