ad_xfs_iread.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 "ad_xfs.h"

void ADIOI_XFS_IreadContig(ADIO_File fd, void *buf, int count, 
                MPI_Datatype datatype, int file_ptr_type,
                ADIO_Offset offset, ADIO_Request *request, int *error_code)  
{
    int  len, typesize, aio_errno = 0;
    static char myname[] = "ADIOI_XFS_IREADCONTIG";

    (*request) = ADIOI_Malloc_request();
    (*request)->optype = ADIOI_READ;
    (*request)->fd = fd;
    (*request)->datatype = datatype;

    MPI_Type_size(datatype, &typesize);
    len = count * typesize;

    if (file_ptr_type == ADIO_INDIVIDUAL) offset = fd->fp_ind;
    aio_errno = ADIOI_XFS_aio(fd, buf, len, offset, 0, &((*request)->handle));
    if (file_ptr_type == ADIO_INDIVIDUAL) fd->fp_ind += len;

    (*request)->queued = 1;
    ADIOI_Add_req_to_list(request);

    fd->fp_sys_posn = -1;

    /* --BEGIN ERROR HANDLING-- */
    if (aio_errno != 0) {
	MPIO_ERR_CREATE_CODE_ERRNO(myname, aio_errno, error_code);
	return;
    }
    /* --END ERROR HANDLING-- */

    *error_code = MPI_SUCCESS;
    fd->async_count++;
}