1 files changed, 46 insertions, 0 deletions
diff --git a/lib/ansible/executor/action_write_locks.py b/lib/ansible/executor/action_write_locks.py
new file mode 100644
index 0000000..fd82744
--- /dev/null
+++ b/lib/ansible/executor/action_write_locks.py
@@ -0,0 +1,46 @@
+# (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
+
+import multiprocessing.synchronize
+
+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()  # type: dict[str | None, multiprocessing.synchronize.Lock]
+
+    # 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()