old_contents: # (c) 2016 - Red Hat, Inc. <info@ansible.com>
  #
  # This file is part of Ansible
  #
  # Ansible 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 3 of the License, or
  # (at your option) any later version.
  #
  # Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
  
  # Make coding more python3-ish
  from __future__ import (absolute_import, division, print_function)
  __metaclass__ = type
  
  from multiprocessing import Lock
  
  from ansible.module_utils.facts.system.pkg_mgr import PKG_MGRS
  
  if 'action_write_locks' not in globals():
      # Do not initialize this more than once because it seems to bash
      # the existing one.  multiprocessing must be reloading the module
      # when it forks?
      action_write_locks = dict()
  
      # Below is a Lock for use when we weren't expecting a named module.
      # It gets used when an action plugin directly invokes a module instead
      # of going through the strategies.  Slightly less efficient as all
      # processes with unexpected module names will wait on this lock
      action_write_locks[None] = Lock()
  
      # These plugins are called directly by action plugins (not going through
      # a strategy).  We precreate them here as an optimization
      mods = set(p['name'] for p in PKG_MGRS)
  
      mods.update(('copy', 'file', 'setup', 'slurp', 'stat'))
      for mod_name in mods:
          action_write_locks[mod_name] = Lock()
  
new_contents: # (c) 2016 - Red Hat, Inc. <info@ansible.com>
  #
  # This file is part of Ansible
  #
  # Ansible 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 3 of the License, or
  # (at your option) any later version.
  #
  # Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
  
  # Make coding more python3-ish
  from __future__ import (absolute_import, division, print_function)
  __metaclass__ = type
  
  from multiprocessing import Lock
  
  from ansible.module_utils.facts.system.pkg_mgr import PKG_MGRS
  
  if 'action_write_locks' not in globals():
      # Do not initialize this more than once because it seems to bash
      # the existing one.  multiprocessing must be reloading the module
      # when it forks?
      action_write_locks = dict()
  
      # Below is a Lock for use when we weren't expecting a named module.  It gets used when an action
      # plugin invokes a module whose name does not match with the action's name.  Slightly less
      # efficient as all processes with unexpected module names will wait on this lock
      action_write_locks[None] = Lock()
  
      # These plugins are known to be called directly by action plugins with names differing from the
      # action plugin name.  We precreate them here as an optimization.
      # If a list of service managers is created in the future we can do the same for them.
      mods = set(p['name'] for p in PKG_MGRS)
  
      mods.update(('copy', 'file', 'setup', 'slurp', 'stat'))
      for mod_name in mods:
          action_write_locks[mod_name] = Lock()
  
subject: Clarify the comments for action_write_locks