From e7e64a8134df2f1fbd9b29acfedffeb145157388 Mon Sep 17 00:00:00 2001
From: Hrvoje Jasak <h.jasak@wikki.co.uk>
Date: Tue, 11 Oct 2016 10:03:25 +0100
Subject: [PATCH] Bugfix: remove locking: if processor does not touch GGI, skip
 it

---
 .../AMG/interfaces/ggiAMGInterface/ggiAMGInterface.C        | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/ggiAMGInterface/ggiAMGInterface.C b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/ggiAMGInterface/ggiAMGInterface.C
index d314e3720..44e9ee8dd 100644
--- a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/ggiAMGInterface/ggiAMGInterface.C
+++ b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/ggiAMGInterface/ggiAMGInterface.C
@@ -250,6 +250,12 @@ Foam::ggiAMGInterface::ggiAMGInterface
         << fineGgiInterface_.interfaceSize() << ": "
         << lTime_.elapsedCpuTime() << endl;
 
+    // If the processor is not in the GGI comm, escape.  HJ, 10/Oct/2016
+    if (Pstream::myProcNo(comm()) == -1)
+    {
+        return;
+    }
+
     // Note: local addressing contains only local faces
     const labelList& fineZa =  fineGgiInterface_.zoneAddressing();