# File lib/uuid.rb, line 320
320:   def next_sequence
321:     if self.class.state_file
322:       open_lock 'rb+' do |io|
323:         @mac, @sequence, @last_clock = read_state(io)
324: 
325:         io.rewind
326:         io.truncate 0
327: 
328:         @sequence += 1
329: 
330:         write_state io
331:       end
332:     else
333:       @sequence += 1
334:     end
335:   rescue Errno::ENOENT
336:     open_lock 'w' do |io|
337:       write_state io
338:     end
339:   ensure
340:     @last_clock = (Time.now.to_f * CLOCK_MULTIPLIER).to_i
341:     @drift = 0
342:   end