1 files changed, 7 insertions, 6 deletions
diff --git a/nova/process.py b/nova/process.py
index 8ecef1584..d3558ed2e 100644
--- a/nova/process.py
+++ b/nova/process.py
@@ -205,12 +205,13 @@ class ProcessPool(object):
         self._pool.release()
         return rv
 
-_instance = None
-def SharedPool():
-    global _instance
-    if _instance is None:
-       _instance = ProcessPool()
-    return _instance
+class SharedPool(ProcessPool):
+    _instance = None
+    def __new__(cls, *args, **kwargs):
+        if not cls._instance:
+            cls._instance = super(SharedPool, cls).__new__(
+                    cls, *args, **kwargs)
+        return cls._instance
 
 def simple_execute(cmd, **kwargs):
     return SharedPool().simple_execute(cmd, **kwargs)