From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 1 Mar 2022 18:02:42 +0000 (-0700)
Subject: Use a valid communicator.
X-Git-Tag: v9.4.0-rc1~416^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f776f00a28ea1c834f6d79d0c8398498405ab0c;p=dealii.git

Use a valid communicator.
---

diff --git a/tests/fullydistributed_grids/repartitioning_05.cc b/tests/fullydistributed_grids/repartitioning_05.cc
index f3810754ef..0f83f4421a 100644
--- a/tests/fullydistributed_grids/repartitioning_05.cc
+++ b/tests/fullydistributed_grids/repartitioning_05.cc
@@ -55,7 +55,7 @@ create_sub_comm(const MPI_Comm &comm, const unsigned int size)
     {
       ierr = MPI_Comm_free(&sub_comm);
       AssertThrowMPI(ierr);
-      return MPI_COMM_NULL;
+      return MPI_COMM_SELF;
     }
 }
 
@@ -69,9 +69,9 @@ partition_distributed_triangulation(const Triangulation<dim, spacedim> &tria_in,
   const auto comm_tria = tria_in.get_communicator();
 
   const auto n_global_active_cells = Utilities::MPI::max(
-    comm_tria == MPI_COMM_NULL ? 0 : tria_in.n_global_active_cells(), comm);
+    comm_tria == MPI_COMM_SELF ? 0 : tria_in.n_global_active_cells(), comm);
 
-  if (comm_tria == MPI_COMM_NULL)
+  if (comm_tria == MPI_COMM_SELF)
     {
       LinearAlgebra::distributed::Vector<double> partition{
         IndexSet(n_global_active_cells), IndexSet(n_global_active_cells), comm};
@@ -111,7 +111,7 @@ test(const MPI_Comm comm, const unsigned int n_partitions)
 
   parallel::distributed::Triangulation<dim> tria(sub_comm);
 
-  if (sub_comm != MPI_COMM_NULL)
+  if (sub_comm != MPI_COMM_SELF)
     {
       GridGenerator::subdivided_hyper_cube(tria, 4);
       tria.refine_global(3);
@@ -136,7 +136,7 @@ test(const MPI_Comm comm, const unsigned int n_partitions)
   print_statistics(tria_pft);
   print_statistics(dof_handler);
 
-  if (sub_comm != MPI_COMM_NULL)
+  if (sub_comm != MPI_COMM_SELF)
     {
       const int ierr = MPI_Comm_free(&sub_comm);
       AssertThrowMPI(ierr);