root/ompi/mpi/c/get_count.c

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DEFINITIONS

This source file includes following definitions.
  1. MPI_Get_count

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
   2 /*
   3  * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
   4  *                         University Research and Technology
   5  *                         Corporation.  All rights reserved.
   6  * Copyright (c) 2004-2010 The University of Tennessee and The University
   7  *                         of Tennessee Research Foundation.  All rights
   8  *                         reserved.
   9  * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
  10  *                         University of Stuttgart.  All rights reserved.
  11  * Copyright (c) 2004-2005 The Regents of the University of California.
  12  *                         All rights reserved.
  13  * Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved.
  14  * Copyright (c) 2013      Los Alamos National Security, LLC.  All rights
  15  *                         reserved.
  16  * Copyright (c) 2015      Research Organization for Information Science
  17  *                         and Technology (RIST). All rights reserved.
  18  * $COPYRIGHT$
  19  *
  20  * Additional copyrights may follow
  21  *
  22  * $HEADER$
  23  */
  24 #include "ompi_config.h"
  25 #include <stdio.h>
  26 #include <limits.h>
  27 
  28 #include "ompi/mpi/c/bindings.h"
  29 #include "ompi/runtime/params.h"
  30 #include "ompi/communicator/communicator.h"
  31 #include "ompi/errhandler/errhandler.h"
  32 #include "ompi/datatype/ompi_datatype.h"
  33 #include "ompi/memchecker.h"
  34 
  35 #if OMPI_BUILD_MPI_PROFILING
  36 #if OPAL_HAVE_WEAK_SYMBOLS
  37 #pragma weak MPI_Get_count = PMPI_Get_count
  38 #endif
  39 #define MPI_Get_count PMPI_Get_count
  40 #endif
  41 
  42 static const char FUNC_NAME[] = "MPI_Get_count";
  43 
  44 
  45 int MPI_Get_count(const MPI_Status *status, MPI_Datatype datatype, int *count)
  46 {
  47     size_t size = 0, internal_count;
  48     int rc      = MPI_SUCCESS;
  49 
  50     OPAL_CR_NOOP_PROGRESS();
  51 
  52     MEMCHECKER(
  53                if (status != MPI_STATUSES_IGNORE) {
  54                    /*
  55                     * Before checking the complete status, we need to reset the definedness
  56                     * of the MPI_ERROR-field (single-completion calls wait/test).
  57                     */
  58                    opal_memchecker_base_mem_defined((void*)&status->MPI_ERROR, sizeof(int));
  59                    memchecker_status(status);
  60                    memchecker_datatype(datatype);
  61                }
  62                );
  63 
  64     if (MPI_PARAM_CHECK) {
  65         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
  66         OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, 1);
  67 
  68         OMPI_ERRHANDLER_CHECK(rc, MPI_COMM_WORLD, rc, FUNC_NAME);
  69     }
  70 
  71     if( ompi_datatype_type_size( datatype, &size ) == MPI_SUCCESS ) {
  72         if( size == 0 ) {
  73             *count = 0;
  74         } else {
  75             internal_count = status->_ucount / size; /* count the number of complete datatypes */
  76             if( (internal_count * size) != status->_ucount ||
  77                 internal_count > ((size_t) INT_MAX) ) {
  78                 *count = MPI_UNDEFINED;
  79             } else {
  80                 *count = (int)internal_count;
  81             }
  82         }
  83     }
  84     return MPI_SUCCESS;
  85 }

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