Teuchos_MPIReductionOpBase.cpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #include "Teuchos_MPIReductionOpBase.hpp"
00030 
00031 #ifdef HAVE_MPI
00032 
00033 //
00034 // This implementation of handling the reduction operator
00035 // will work just fine in a single threaded program.
00036 // For multi-threaded program this has to be reworked!
00037 //
00038 
00039 //
00040 // Management of the reduction operator object
00041 //
00042 
00043 namespace {
00044 
00045 Teuchos::RefCountPtr<const Teuchos::MPIReductionOpBase> the_reduct_op = Teuchos::null;
00046 
00047 } // namespace
00048 
00049 extern "C" {
00050 
00051 void Teuchos_MPI_reduction_op(
00052   void              *invec
00053   ,void             *inoutvec
00054   ,int              *len
00055   ,MPI_Datatype    *datatype
00056   )
00057 {
00058   Teuchos::get_reduct_op()->reduce(invec,inoutvec,len,datatype);
00059 }
00060 
00061 } // extern "C"
00062 
00063 void Teuchos::set_reduct_op( const RefCountPtr<const MPIReductionOpBase>& reduct_op )
00064 {
00065   TEST_FOR_EXCEPT( get_reduct_op() != null && reduct_op != null  );
00066   the_reduct_op = reduct_op;
00067 }
00068 
00069 Teuchos::RefCountPtr<const Teuchos::MPIReductionOpBase>
00070 Teuchos::get_reduct_op()
00071 {
00072   return the_reduct_op;
00073 }
00074 
00075 namespace Teuchos {
00076 
00077 //
00078 // Defintion of MPIReductionOpCreator
00079 //
00080 
00081 MPIReductionOpCreator::MPIReductionOpCreator( const Teuchos::RefCountPtr<const MPIReductionOpBase>& reduct_op )
00082 {
00083   set_reduct_op(reduct_op);
00084   mpi_op_ = MPI_OP_NULL;
00085   TEST_FOR_EXCEPT(
00086     0!=MPI_Op_create( &Teuchos_MPI_reduction_op ,1 ,&mpi_op_ ) // Assume op is commutative?
00087     );
00088 }
00089 
00090 MPIReductionOpCreator::~MPIReductionOpCreator()
00091 {
00092   MPI_Op_free(&mpi_op_);
00093   set_reduct_op( null );
00094 }
00095 
00096 } // namespace Teuchos
00097 
00098 #endif // HAVE_MPI

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