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/* Copyright (C) 2010 LinBox
 *
 *
 *
 * ========LICENCE========
 * This file is part of the library LinBox.
 *
  * LinBox 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * ========LICENCE========
 */



#ifndef __LINBOX_mpicpp_INL
#define __LINBOX_mpicpp_INL
//  BRYAN - changed the iterator specific lines to simply
//  sizeof (int *)'s...  also updated the .h file to not
//  define these functions as having default parameters,
//  as mpicxx compiler was having trouble with this

namespace LinBox
{

	Communicator::Communicator(MPI_Comm comm = MPI_COMM_NULL) :
		_mpi_comm(comm), _mpi_boss(false)
	{}

	// MPI_initializing constructor
	// When this communicator is destroyed MPI is shut down (finalized).
	Communicator::Communicator(int* ac, char*** av) :
		_mpi_comm(MPI_COMM_WORLD), _mpi_boss(true)
	{	MPI_Init(ac, av); }

	// copy constructor
	Communicator::Communicator(const Communicator& D) :
		_mpi_comm(D._mpi_comm), _mpi_boss(false), stat(D.stat)
	{}

	Communicator::~Communicator()
	{	if (_mpi_boss) MPI_Finalize(); }

	// accessors
	int Communicator::size()
	{	int s; MPI_Comm_size(_mpi_comm, &s); return s; }

	int Communicator::rank()
	{	int r; MPI_Comm_rank(_mpi_comm, &r); return r; }

	MPI_Status Communicator::status()
	{	return stat; }

	MPI_Comm Communicator::mpi_communicator()
	{	return _mpi_comm; }

	// peer to peer communication
	template < class Ptr >
	void Communicator::send( Ptr b, Ptr e, int dest, int tag = 0)
	{
		MPI_Send( &*b,
			  (e - b)*sizeof(typename Ptr::value_type),
			  MPI_BYTE,
			  dest,
			  tag,
			  _mpi_comm);
	}

	template < class Ptr >
	void Communicator::ssend( Ptr b, Ptr e, int dest, int tag = 0)
	{	MPI_Ssend( &b[0],
			   //(e - b)*sizeof(iterator_traits<Ptr>::value_type),
			   (e-b)*sizeof(int *),
			   MPI_BYTE,
			   dest,
			   tag,
			   _mpi_comm);
	}

	template < class Ptr >
	void Communicator::recv( Ptr b, Ptr e, int dest, int tag = 0)
	{
		MPI_Recv( &b[0],
			  (e - b)*sizeof(typename Ptr::value_type),
			  MPI_BYTE,
			  dest,
			  tag,
			  _mpi_comm,
			  &stat);
	}

	template < class X >
	void Communicator::send( X *b, X *e, int dest, int tag = 0)
	{
		MPI_Send( b,
			  (e - b)*sizeof(X),
			  MPI_BYTE,
			  dest,
			  tag,
			  _mpi_comm);
	}


	template < class X >
	void Communicator::recv( X *b, X *e, int dest, int tag = 0)
	{
		MPI_Recv( b,
			  (e - b)*sizeof(X),
			  MPI_BYTE,
			  dest,
			  tag,
			  _mpi_comm,
			  &stat);
	}


	// whole object send and recv
	template < class X >
	void Communicator::send( X& b, int dest /*, int tag = 0 */)
	{	MPI_Send(&b,
			 sizeof(X),
			 MPI_BYTE,
			 dest,
			 0,
			 _mpi_comm);
	}

	template < class X >
	void Communicator::ssend( X& b, int dest /*, int tag = 0 */)
	{	MPI_Ssend(&b,
			  sizeof(X),
			  MPI_BYTE,
			  dest,
			  0,
			  _mpi_comm);
	}

	template < class X >
	void Communicator::bsend(X& b, int dest /*, int tag = 0*/)
	{	MPI_Bsend( &b,
			   sizeof(X),
			   MPI_BYTE,
			   dest,
			   0,
			   _mpi_comm);
	}

	template < class X >
	void Communicator::recv( X& b, int dest /*, int tag = 0*/)
	{	MPI_Recv( &b,
			  sizeof(X),
			  MPI_BYTE,
			  dest,
			  0,
			  _mpi_comm,
			  &stat);
	}

	template < class X >
	void Communicator::buffer_attach(X b)
	{
		MPI_Buffer_attach( malloc(sizeof(X) *  60) ,
				   sizeof(X) * 60 );
	}

	template < class X >
	int Communicator::buffer_detach(X &b, int *size)
	{  return MPI_Buffer_detach( &b,
				     size);
	}

	// collective communication
	template < class Ptr, class Function_object >
	void Communicator::reduce( Ptr bloc, Ptr eloc, Ptr bres, Function_object binop, int root)
	{}

	// member access
	MPI_Status Communicator::get_stat()
	{
		return stat;
	}

} // namespace LinBox
#endif // __LINBOX_mpicpp_INL


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