My /run/lock/ directory is empty except for ./whoopsie/. I have understood /run/lock/ as a replacement for /var/lock/ but was surprised to find it entirely empty.
Is whoopsie meant as a deterrent from using this directory?
I did find other lock files under /run/, though. Most notably in /run/user/<me>/. I would have expect per-users lock files in /run/lock/user/ and not in a separate directory.
Hoping for some clarification!
/run is something in-between /var and /tmp. It's pretty much /var, except using a TMPFS (which means it gets cleared at each reboot). So /run/lock is a TMPFS version of /var/lock.
Some extra information (put in a much better way than I could ever put it :P): http://thread.gmane.org/gmane.linux.redhat.fedora.devel/146976.