From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Fri, 18 Aug 2017 17:13:30 +0000 (+0200)
Subject: Fix failing MPI tests
X-Git-Tag: v9.0.0-rc1~1210^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=719c7914972b68d2fe49e074bb467fcb479ec4ff;p=dealii.git

Fix failing MPI tests
---

diff --git a/include/deal.II/distributed/grid_tools.h b/include/deal.II/distributed/grid_tools.h
index c794a707ca..3cc8761238 100644
--- a/include/deal.II/distributed/grid_tools.h
+++ b/include/deal.II/distributed/grid_tools.h
@@ -337,12 +337,8 @@ namespace parallel
         {
           internal::CellDataTransferBuffer<dim, DataType> &data = destination_to_data_buffer_map[*it];
 
-          // pack all the data into
-          // the buffer for this
-          // recipient and send
-          // it. keep data around
-          // till we can make sure
-          // that the packet has been
+          // pack all the data into the buffer for this recipient and send it.
+          // keep data around till we can make sure that the packet has been
           // received
           sendbuffers[idx] = data.pack_data ();
           const int ierr = MPI_Isend(sendbuffers[idx].data(), sendbuffers[idx].size(),
@@ -384,6 +380,14 @@ namespace parallel
               unpack(cell, *data);
             }
         }
+
+      // make sure that all communication is finished
+      // when we leave this function.
+      if (requests.size())
+        {
+          const int ierr = MPI_Waitall(requests.size(), &requests[0], MPI_STATUSES_IGNORE);
+          AssertThrowMPI(ierr);
+        }
 #endif // DEAL_II_WITH_MPI
     }