# File lib/uuid.rb, line 270
270:   def next_sequence
271:     if self.class.state_file
272:       open_lock 'rb+' do |io|
273:         @mac, @sequence, @last_clock = read_state(io)
274: 
275:         io.rewind
276:         io.truncate 0
277: 
278:         @sequence += 1
279: 
280:         write_state io
281:       end
282:     else
283:       @sequence += 1
284:     end
285:   rescue Errno::ENOENT
286:     open_lock 'w' do |io|
287:       write_state io
288:     end
289:   ensure
290:     @last_clock = (Time.now.to_f * CLOCK_MULTIPLIER).to_i
291:     @drift = 0
292:   end