1# (c) 2016 - Red Hat, Inc. <info@ansible.com>
2#
3# This file is part of Ansible
4#
5# Ansible is free software: you can redistribute it and/or modify
6# it under the terms of the GNU General Public License as published by
7# the Free Software Foundation, either version 3 of the License, or
8# (at your option) any later version.
9#
10# Ansible is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13# GNU General Public License for more details.
14#
15# You should have received a copy of the GNU General Public License
16# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
17
18# Make coding more python3-ish
19from __future__ import (absolute_import, division, print_function)
20__metaclass__ = type
21
22from multiprocessing import Lock
23
24from ansible.module_utils.facts.system.pkg_mgr import PKG_MGRS
25
26if 'action_write_locks' not in globals():
27    # Do not initialize this more than once because it seems to bash
28    # the existing one.  multiprocessing must be reloading the module
29    # when it forks?
30    action_write_locks = dict()
31
32    # Below is a Lock for use when we weren't expecting a named module.  It gets used when an action
33    # plugin invokes a module whose name does not match with the action's name.  Slightly less
34    # efficient as all processes with unexpected module names will wait on this lock
35    action_write_locks[None] = Lock()
36
37    # These plugins are known to be called directly by action plugins with names differing from the
38    # action plugin name.  We precreate them here as an optimization.
39    # If a list of service managers is created in the future we can do the same for them.
40    mods = set(p['name'] for p in PKG_MGRS)
41
42    mods.update(('copy', 'file', 'setup', 'slurp', 'stat'))
43    for mod_name in mods:
44        action_write_locks[mod_name] = Lock()
45