Signed-off-by: Isaku Yamahata <yamah...@valinux.co.jp>
---
 ryu/lib/synchronized.py |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 ryu/lib/synchronized.py

diff --git a/ryu/lib/synchronized.py b/ryu/lib/synchronized.py
new file mode 100644
index 0000000..d1129db
--- /dev/null
+++ b/ryu/lib/synchronized.py
@@ -0,0 +1,29 @@
+# Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
+# Copyright (C) 2012 Isaku Yamahata <yamahata at private email ne jp>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import functools
+
+
+def synchronized(lockname):
+    def _synchronized(meth):
+        @functools.wraps(meth)
+        def wrapped(self, *args, **kwargs):
+            lock = getattr(self, lockname)
+            with lock:
+                meth(self, *args, **kwargs)
+        return wrapped
+
+    return _synchronized
-- 
1.7.10.4


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