Re: Add a cooperative FS lock to lilypond-book. (issue 555360043 by hanwenn@gmail.com)

[hanwenn]

commit 7ab9c8fa4faff7a513d0ecfbc7eecf7efd2b8ea8
Author: Han-Wen Nienhuys <han...@lilypond.org>
Date:   Sun Mar 1 17:47:53 2020 +0100

    Add a FS lock to lilypond-book


https://codereview.appspot.com/555360043/