Yes. In particular, the way it effectively gets you to "I control the lock file; it will be altered when I explicitly request it and never as a side-effect of

Yes. In particular, the way it effectively gets you to "I control the lock file; it will be altered when I explicitly request it and never as a side-effect of any other action". For some reason many other languages' systems (which have had opportunities to learn from others' mistakes) don't seem to treat this as a requirement.