get_bytoff.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"
#include "adioi.h" /* ADIOI_Get_byte_offset() prototype */

#ifdef HAVE_WEAK_SYMBOLS

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

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

/*@
    MPI_File_get_byte_offset - Returns the absolute byte position in 
                the file corresponding to "offset" etypes relative to
                the current view

Input Parameters:
. fh - file handle (handle)
. offset - offset (nonnegative integer)

Output Parameters:
. disp - absolute byte position of offset (nonnegative integer)

.N fortran
@*/
int MPI_File_get_byte_offset(MPI_File mpi_fh,
			     MPI_Offset offset,
			     MPI_Offset *disp)
{
    int error_code;
    ADIO_File fh;
    static char myname[] = "MPI_FILE_GET_BYTE_OFFSET";

    MPID_CS_ENTER();
    MPIR_Nest_incr();

    fh = MPIO_File_resolve(mpi_fh);

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

    if (offset < 0)
    {
	error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
					  myname, __LINE__, MPI_ERR_ARG,
					  "**iobadoffset", 0);
	error_code = MPIO_Err_return_file(fh, error_code);
	goto fn_exit;
    }

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

    ADIOI_Get_byte_offset(fh, offset, disp);

fn_exit:
    MPIR_Nest_decr();
    MPID_CS_EXIT();

    return MPI_SUCCESS;
}