code: def _commit(self, mergetype, optimize, merge):
      # Pull a (run_file_name, segment) tuple off the result queue for each
      # sub-task, representing the final results of the task
  
      # Merge existing segments
      finalsegments = self._merge_segments(mergetype, optimize, merge)
      results = []
      for writer in self.tasks:
          results.append(finish_subsegment(writer))
  
      self._merge_subsegments(results, mergetype)
      self._close_segment()
      self._assemble_segment()
      finalsegments.append(self.get_segment())
  
      self._commit_toc(finalsegments)
      self._finish()
  
imports: from __future__ import with_statement
  from multiprocessing import Process, Queue, cpu_count
  from whoosh.compat import queue, xrange, pickle
  from whoosh.codec import base
  from whoosh.writing import SegmentWriter
  from whoosh.externalsort import imerge
  from whoosh.util import random_name
label_desc: Use image node_id 3 for calling the SerialMpWriter obj's underlying member method code with example usage: obj._commit(mergetype, optimize, merge) without return types