[libvirt-users] lock managers

On Mon, Jul 25, 2011 at 03:32:32PM -0600, Eric Blake wrote:

Yes, both useful lock managers (sanlock and fcntl) work best with the use of a shared lock directory, at which point they correctly handle live migration between hosts.

Where would I learn how to use fcntl for this? I see code for it in the current git, but no hint on usage. Perhaps I should just be patient? Thanks, Whit