From 15204b8e78df9d82960c20c4ed057f41fb3ba4f4 Mon Sep 17 00:00:00 2001
From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 7 Jan 2013 20:58:03 +0000
Subject: [PATCH] Only clean up memory if PETSc hasn't done that itself yet.

git-svn-id: https://svn.dealii.org/trunk@27968 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/source/base/mpi.cc | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/deal.II/source/base/mpi.cc b/deal.II/source/base/mpi.cc
index 4ad632d348..0f0b14b717 100644
--- a/deal.II/source/base/mpi.cc
+++ b/deal.II/source/base/mpi.cc
@@ -2,7 +2,7 @@
 //      $Id$
 //    Version: $Name$
 //
-//    Copyright (C) 2005, 2006, 2008, 2009, 2010, 2011, 2012 by the deal.II authors
+//    Copyright (C) 2005, 2006, 2008, 2009, 2010, 2011, 2012, 2013 by the deal.II authors
 //
 //    This file is subject to QPL and may not be  distributed
 //    without copyright and license information. Please refer
@@ -367,23 +367,33 @@ namespace Utilities
       ::release_unused_memory ();
 #  endif
 
-      // Same for PETSc.
+      // Same for PETSc. only do this if PETSc hasn't been
+      // terminated yet since PETSc deletes all vectors that
+      // have been allocated but not freed at the time of
+      // calling PETScFinalize. running the calls below after
+      // PetscFinalize has already been called will therefore
+      // yield errors of double deallocations
 #ifdef DEAL_II_USE_PETSC
-      GrowingVectorMemory<PETScWrappers::MPI::Vector>
-      ::release_unused_memory ();
-      GrowingVectorMemory<PETScWrappers::MPI::BlockVector>
-      ::release_unused_memory ();
-      GrowingVectorMemory<PETScWrappers::Vector>
-      ::release_unused_memory ();
-      GrowingVectorMemory<PETScWrappers::BlockVector>
-      ::release_unused_memory ();
+      if ((PetscInitializeCalled == PETSC_TRUE)
+	  &&
+	  (PetscFinalizeCalled == PETSC_FALSE))
+	{
+	  GrowingVectorMemory<PETScWrappers::MPI::Vector>
+	    ::release_unused_memory ();
+	  GrowingVectorMemory<PETScWrappers::MPI::BlockVector>
+	    ::release_unused_memory ();
+	  GrowingVectorMemory<PETScWrappers::Vector>
+	    ::release_unused_memory ();
+	  GrowingVectorMemory<PETScWrappers::BlockVector>
+	    ::release_unused_memory ();
 
 #  ifdef DEAL_II_USE_SLEPC
-      // and now end SLEPc (with PETSc)
-      SlepcFinalize();
+	  // and now end SLEPc (with PETSc)
+	  SlepcFinalize();
 #  else
-      // or just end PETSc.
-      PetscFinalize();
+	  // or just end PETSc.
+	  PetscFinalize();
+	}
 #  endif
 #else
 
-- 
2.39.5