ad_ntfs_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_ntfs.h"

void ADIOI_NTFS_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;
    int err;
    static char myname[] = "ADIOI_NTFS_IreadContig";

    (*request) = ADIOI_Malloc_request();
    if ((*request) == NULL)
    {
	*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
	    myname, __LINE__, MPI_ERR_IO,
	    "**nomem", "**nomem %s", "ADIOI_Request");
	return;
    }
    (*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;
    }
    err = ADIOI_NTFS_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);

    /* --BEGIN ERROR HANDLING-- */
    if (err != MPI_SUCCESS)
    {
	*error_code = MPIO_Err_create_code(err, MPIR_ERR_RECOVERABLE,
					   myname, __LINE__, MPI_ERR_IO,
					   "**io", 0);
	return;
    }
    /* --END ERROR HANDLING-- */
    *error_code = MPI_SUCCESS;

    fd->fp_sys_posn = -1;   /* set it to null. */
    fd->async_count++;
}