Given that your issue is XML::LibXML is trying to read an empty file, perhaps you could use -s to test for non-zero size, and institute a waiting loop until it passes that condition? Something like: 

sub process_drop_file {
    my $file = Path::Class::File->new(shift);
    -f $file or croak "'$file' is not a file";
    sleep(1) until (-s $file);                 # <-- New line
    my $doc = XML::LibXML->new->parse_file("$file");
    # Do stuff with it...
    $file->remove or croak "Couldn't remove '$file'";
}

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In reply to Re: Race condition in Linux::Inotify2 between dir and new file? by kennethk
in thread Race condition in Linux::Inotify2 between dir and new file? by Your Mother

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