antv-l7/node_modules/lockfile/sockets.md

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)