text: # Xlib.support.lock -- allocate a lock
  #
  #    Copyright (C) 2000 Peter Liljenberg <petli@ctrl-c.liu.se>
  #
  #    This program is free software; you can redistribute it and/or modify
  #    it under the terms of the GNU General Public License as published by
  #    the Free Software Foundation; either version 2 of the License, or
  #    (at your option) any later version.
  #
  #    This program is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU General Public License for more details.
  #
  #    You should have received a copy of the GNU General Public License
  #    along with this program; if not, write to the Free Software
  #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  class _DummyLock:
      def __init__(self):
  
          # This might be nerdy, but by assigning methods like this
          # instead of defining them all, we create a single bound
          # method object once instead of one each time one of the
          # methods is called.
  
          # This gives some speed improvements which should reduce the
          # impact of the threading infrastructure in the regular code,
          # when not using threading.
  
          self.acquire = self.release = self.locked = self.__noop
  
      def __noop(self, *args):
          return
  
  
  # More optimisations: we use a single lock for all lock instances
  _dummy_lock = _DummyLock()
  
  def allocate_lock():
      return _dummy_lock
  