Fix non threadsafe code

diff --git a/simgear/scene/util/SGSceneFeatures.cxx b/simgear/scene/util/SGSceneFeatures.cxx
index ccefab957fa17adb0b6eb66213b1d8553f8d6923..71edb2ebbda525cdcb9aab551e77fed719508da6 100644 (file)
--- a/simgear/scene/util/SGSceneFeatures.cxx
+++ b/simgear/scene/util/SGSceneFeatures.cxx
@@ -44,14 +44,14 @@ SGSceneFeatures::SGSceneFeatures() :
 {
 }
 
+static SGMutex mutexSGSceneFeatures_instance;
 SGSceneFeatures*
 SGSceneFeatures::instance()
 {
   static SGSharedPtr<SGSceneFeatures> sceneFeatures;
   if (sceneFeatures)
     return sceneFeatures;
-  static SGMutex mutex;
-  SGGuard<SGMutex> guard(mutex);
+  SGGuard<SGMutex> guard(mutexSGSceneFeatures_instance);
   if (sceneFeatures)
     return sceneFeatures;
   sceneFeatures = new SGSceneFeatures;