Process running from dynamic link

[jcs090218]

If I have tree-sitter running with dynamic link file (dll) then I am not able to upgrade tree-sitter-langs package.

Steps of reproduce

1. Open any file with tree-sitter support (ensure there is process running with dll file)
2. package-list-packages, and try to remove package tree-sitter-langs

Then you should get an error with process running, not able to delete package, etc.

Environments

• OS: Windows 10 x64
• Emacs version: 27.1

[ubolonton]

Windows seems to disallow deleting loaded dll files.

I'm not familiar enough with Windows to fix this, or to suggest workarounds.

[kiennq]

I think you can customize tree-sitter-langs-grammar-dir for that. So the langs dll is stored outside of package and will not be delete when upgrading.

(use-package tree-sitter-langs
  :ensure t
  :defer t
  :custom
  (tree-sitter-langs-grammar-dir (expand-file-name ".cache/tree-sitter-langs/" user-emacs-directory)))

In Windows, loaded dll cannot be deleted online but can be moved and marked to delete next time PC reboot. Perhaps package.el should use that, i.e, move loaded dll file to $TEMP and mark it as delete on reboot, then we can cleanly upgrade package on Windows without worry about file deletion error.