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/*
* Copyright (c) 1997-1999, 2003 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef FFTW_F77_MPI_H
#define FFTW_F77_MPI_H
#include "fftw_mpi.h"
#include "fftw-int.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/***********************************************************************/
/* How do we pass MPI_Comm data types from Fortran? Here are three
possibilities, selected among by defining the appropriate cpp
symbol (in fftw/config.h, preferably using the configure script):
HAVE_MPI_COMM_F2C -- the MPI_Comm_f2c function is available
(this function is supplied e.g. by MPICH)
FFTW_USE_F77_MPI_COMM -- Fortran gives us an (MPI_Comm *)
FFTW_USE_F77_MPI_COMM_P -- MPI_Comm is a pointer, and Fortran
passes it to us directly by value (seems
unlikely).
[default] -- ignore the comm parameter, and just use MPI_COMM_WORLD
(this at least will always work, at the expense of flexibility)
*/
#if defined(HAVE_MPI_COMM_F2C)
# define FFTW_MPI_COMM_F2C(comm) MPI_Comm_f2c(*((MPI_Comm *) comm))
#elif defined(FFTW_USE_F77_MPI_COMM)
# define FFTW_MPI_COMM_F2C(comm) (* ((MPI_Comm *) comm))
#elif defined(FFTW_USE_F77_MPI_COMM_P)
# define FFTW_MPI_COMM_F2C(comm) ((MPI_Comm) comm)
#else
# define FFTW_MPI_COMM_F2C(comm) MPI_COMM_WORLD
#endif
/***********************************************************************/
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* FFTW_F77_MPI_H */
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