added synchMultiVector function to get correct sync after coarsening operations

AMDiS/src/parallel/MeshDistributor.h

@@ -282,6 +282,74 @@ namespace AMDiS { namespace Parallel {
       synchVector(vec);
     }
     
+    
+/** \brief
+ * Synchronize \p vec using indicator vector \p additionalVecs, e.g. let
+ * additionalVecs[0] be 1 on all dofs the value should be taken from
+my rank
+ * and 0 elsewhere.
+ */
+// op(std::vector<T>& out, std::vector<T> const& in)
+template<typename T, typename Operator>
+void synchMultiVector(DOFVector<T> &vec, std::vector<DOFVector<T>*> additionalVecs, Operator op)
+{
+  // get FE space and check equal FE space
+  const FiniteElemSpace *fe = vec.getFeSpace();
+  MultiLevelDofComm& dofComm = dofComms[fe->getMesh()];
+
+  typedef typename std::vector<DOFVector<T>*>::iterator Iterator;
+
+  int nLevels = levelData.getNumberOfLevels();
+  for (int level = nLevels - 1; level >= 0; level--)
+  {
+    StdMpi < std::vector<std::vector<T> > >
+    stdMpi(levelData.getMpiComm(level));
+
+    for (DofComm::Iterator it(dofComm[level].getRecvDofs(), fe);
+      !it.end(); it.nextRank())
+    {
+      std::vector<std::vector<T> > dofs;
+      dofs.reserve(it.getDofs().size());
+      for (; !it.endDofIter(); it.nextDof())
+      {
+	std::vector<T> values;
+	values.reserve(additionalVecs.size() + 1);
+	values.push_back( vec[it.getDofIndex()] );
+	for (Iterator vecIt = additionalVecs.begin(); vecIt !=
+   additionalVecs.end(); ++vecIt )
+	values.push_back( (**vecIt)[it.getDofIndex()] );
+	dofs.push_back( values );
+      }
+      stdMpi.send(it.getRank(), dofs);
+    }
+
+    for (DofComm::Iterator it(dofComm[level].getSendDofs(), fe);
+      !it.end(); it.nextRank())
+    stdMpi.recv(it.getRank());
+
+    stdMpi.startCommunication();
+
+    for (DofComm::Iterator it(dofComm[level].getSendDofs(), fe);
+      !it.end(); it.nextRank()) {
+	for (; !it.endDofIter(); it.nextDof()) {
+   std::vector<T> values;
+   values.reserve(additionalVecs.size() + 1);
+   values.push_back( vec[it.getDofIndex()] );
+   for (Iterator vecIt = additionalVecs.begin(); vecIt !=
+     additionalVecs.end(); ++vecIt )
+   values.push_back( (**vecIt)[it.getDofIndex()] );
+
+   op(values, stdMpi.getRecvData(it.getRank())[it.getDofCounter()]);
+  }
+       }
+  }
+
+  synchVector(vec);
+}
+
+  
+  
+    
     /** \brief
     * This function must be used if the values of a set of DOFVectors must be
     * synchronized over all ranks. That means, that each rank sends the