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GeoModelCore/GeoModelKernel/GeoModelKernel/GeoLogVol.h

@@ -55,6 +55,7 @@ class GeoLogVol : public RCBase
 
   //	Material composition of this volume.
   mutable GeoIntrusivePtr<const GeoMaterial> m_material{};
+  std::shared_mutex m_mutex{};
 
   //	Shape of this volume.
   GeoIntrusivePtr<const GeoShape> m_shape{};