Teuchos_MPIComm.hpp

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// ***********************************************************************
// 
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
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#ifndef TEUCHOS_MPICOMM_H
#define TEUCHOS_MPICOMM_H

#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_Array.hpp"
#include "Teuchos_RCP.hpp"

#ifdef HAVE_MPI
#include "mpi.h"
#endif


namespace Teuchos
{
  class TEUCHOS_LIB_DLL_EXPORT MPIComm
    {
    public:

      MPIComm();

#ifdef HAVE_MPI
      MPIComm(MPI_Comm comm);
#endif

      static MPIComm& world();

      int getRank() const {return myRank_;}

      int getNProc() const {return nProc_;}

      void synchronize() const ;



      void allToAll(void* sendBuf, int sendCount, int sendType,
                    void* recvBuf, int recvCount, int recvType) const ;

      void allToAllv(void* sendBuf, int* sendCount, int* sendDisplacements,
                     int sendType,
                     void* recvBuf, int* recvCount,
                     int* recvDisplacements,
                     int recvType) const ;

      void allReduce(void* input, void* result, int inputCount, int type,
                     int op) const ;


      void gather(void* sendBuf, int sendCount, int sendType,
                  void* recvBuf, int recvCount, int recvType,
                  int root) const ;

      void gatherv(void* sendBuf, int sendCount, int sendType,
                   void* recvBuf, int* recvCount, int* displacements, 
                   int recvType, int root) const ;

      void allGather(void* sendBuf, int sendCount, int sendType,
                     void* recvBuf, int recvCount, int recvType) const ;

      void allGatherv(void* sendBuf, int sendCount, int sendType,
                      void* recvBuf, int* recvCount, int* recvDisplacements,
                      int recvType) const ;

      void bcast(void* msg, int length, int type, int src) const ;


#ifdef HAVE_MPI
      MPI_Comm getComm() const {return comm_;}
#endif



      static const int INT;
      static const int FLOAT;
      static const int DOUBLE;
      static const int CHAR;



      static const int SUM;
      static const int MIN;
      static const int MAX;
      static const int PROD;

      // errCheck() checks the return value of an MPI call and throws
      // a ParallelException upon failure.
      static void errCheck(int errCode, const std::string& methodName);

#ifdef HAVE_MPI
      static MPI_Datatype getDataType(int type);

      static MPI_Op getOp(int op);
#endif
    private:
#ifdef HAVE_MPI
      MPI_Comm comm_;
#endif

      int nProc_;
      int myRank_;

      void init();

      int mpiIsRunning() const ;
    };
}
#endif

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