bug#24714: delete-directory race condition

[Glenn Morris]

Eli Zaretskii wrote:

>> will fail with "No such file or directory" if a file in /tmp/foo
>> happen to be deleted by some other process in between the time that
>> delete-directory calls directory-files and the time it calls delete-file.
>
> IMO, delete-directory should simply catch ENOENT errors and ignore
> them when it deletes files and subdirectories under the "recursive"
> option.

I don't think that's enough, since a file could equally well be
_created_ by some other process after delete-directory calls directory-files.
Frankly I don't see how Emacs's delete-directory can work reliably as
currently implemented.