Lock entire AlignAlgorithm operator

Alignment/TAlignment/src/AlignAlgorithm.cpp

@@ -39,6 +39,8 @@ namespace LHCb::Alignment {
     bool accumulate( Equations& equations, const Residuals<TNode>& residuals ) const;
     bool testTrackNodes( const Track& track ) const;
     bool testNodes( const TFitResult* fr ) const;
+
+    mutable std::mutex               m_lock;
   };
 
   using AlignAlgo          = AlignAlgorithm<LHCb::KalmanFitResult, LHCb::FitNode>;
@@ -51,6 +53,7 @@ namespace LHCb::Alignment {
   //=============================================================================
   template <typename TFitResult, typename TNode>
   void AlignAlgorithm<TFitResult, TNode>::operator()( const EventContext&, const GenericDetElem& lhcb ) const {
+    auto lock = std::scoped_lock{m_lock};
     // FIXME XXX : we should check that the ConditionContext does not change
     // If it does, we should throw an exception and stop processing
     // The risk is to mix data from different runs by mistake and screw the alignment procedure