torchvision.io.read_image{,_async}(string filename, ...) prevents subsequent opening of the file for reading

[hiyuh]

Describe the bug

• SSIA.

To Reproduce

• try to open an image file while processing torchvision.io.read_image{,_async}(string filename, ...).

Expected behavior

• following stream must be opened w/ FileAccess.Read and FileShare.Read.
  • https://github.com/dotnet/TorchSharp/blob/6ceda5336102bfb1e20b65ece1686fa9a8bd9a20/src/TorchVision/IO/Image.cs#L139
  • https://github.com/dotnet/TorchSharp/blob/6ceda5336102bfb1e20b65ece1686fa9a8bd9a20/src/TorchVision/IO/Image.cs#L170
• see also https://learn.microsoft.com/en-us/dotnet/api/system.io.file.open?view=net-8.0#system-io-file-open(system-string-system-io-filemode).

  Opens a FileStream on the specified path with read/write access with no sharing.

Please complete the following information:

• OS: at least on Windows
• Package: TorchVision
• Version: 0.105.1 or earlier

Additional context

• a possible workaround i can think of: use torchvision.io.read_image{,_async}(Stream stream, ...) w/ correctly opened stream.