to ACQUIRE(lockname)
- create server, listen on lockname
- if enotsock, WATCH(lockname)
- if eaddrinuse,
- CONNECT(lockname)
- unref server
- lock has been acquired via server
! on connection, place sockets in queue
to RELEASE(lockname)
- if acquired via connection
- disconnect
- if acquired via server
- send "OK" to front-most connection
- when connection disconnects, RELEASE(lockname)
- if acquired via filename
- unlink file
to CONNECT(lockname)
- net.connect(lockname)
- if enoent or socket termination, ACQUIRE(lockname)
- when server says "OK",
- lock has been acquired via connection
to WATCH(lockname)
- fs.watch(lockname)
- on change, ACQUIRE(lockname)
