get_group.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

#include "mpioimpl.h"

#ifdef HAVE_WEAK_SYMBOLS

#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_File_get_group = PMPI_File_get_group
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_get_group MPI_File_get_group
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_get_group as PMPI_File_get_group
/* end of weak pragmas */
#endif

/* Include mapping from MPI->PMPI */
#define MPIO_BUILD_PROFILING
#include "mpioprof.h"
#endif

/*@
    MPI_File_get_group - Returns the group of processes that 
                         opened the file

Input Parameters:
. fh - file handle (handle)

Output Parameters:
. group - group that opened the file (handle)

.N fortran
@*/
int MPI_File_get_group(MPI_File mpi_fh, MPI_Group *group)
{
    int error_code;
    ADIO_File fh;
    static char myname[] = "MPI_FILE_GET_GROUP";

    MPID_CS_ENTER();
    MPIR_Nest_incr();

    fh = MPIO_File_resolve(mpi_fh);

    /* --BEGIN ERROR HANDLING-- */
    MPIO_CHECK_FILE_HANDLE(fh, myname, error_code);
    /* --END ERROR HANDLING-- */


    /* note: this will return the group of processes that called open, but
     * with deferred open this might not be the group of processes that
     * actually opened the file from the file system's perspective
     */
    error_code = MPI_Comm_group(fh->comm, group);

fn_exit:
    MPIR_Nest_decr();
    MPID_CS_EXIT();
    return error_code;
}