any-true.c 1.87 KB
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/*
 * Copyright (c) 2003, 2007-11 Matteo Frigo
 * Copyright (c) 2003, 2007-11 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "ifftw-mpi.h"

/* During planning, if any process fails to create a plan then
   all of the processes must fail.  This synchronization is implemented
   by the following routine.

   Instead of 
        if (failure) goto nada;
   we instead do:
        if (any_true(failure, comm)) goto nada;
*/

int XM(any_true)(int condition, MPI_Comm comm)
{
     int result;
     MPI_Allreduce(&condition, &result, 1, MPI_INT, MPI_LOR, comm);
     return result;
}

/***********************************************************************/

#if defined(FFTW_DEBUG)
/* for debugging, we include an assertion to make sure that
   MPI problems all produce equal hashes, as checked by this routine: */

int XM(md5_equal)(md5 m, MPI_Comm comm)
{
     unsigned long s0[4];
     int i, eq_me, eq_all;

     X(md5end)(&m);
     for (i = 0; i < 4; ++i) s0[i] = m.s[i];
     MPI_Bcast(s0, 4, MPI_UNSIGNED_LONG, 0, comm);
     for (i = 0; i < 4 && s0[i] == m.s[i]; ++i) ;
     eq_me = i == 4;
     MPI_Allreduce(&eq_me, &eq_all, 1, MPI_INT, MPI_LAND, comm);
     return eq_all;
}
#endif