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openmpi/ompi/mca/fbtl/posix/fbtl_posix_pwritev.c
2014-09-10 21:59:45 +00:00

117 строки
3.1 KiB
C

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2011 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2008-2014 University of Houston. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "fbtl_posix.h"
#include "mpi.h"
#include <unistd.h>
#include <sys/uio.h>
#include <limits.h>
#include "ompi/constants.h"
#include "ompi/mca/fbtl/fbtl.h"
ssize_t mca_fbtl_posix_pwritev(mca_io_ompio_file_t *fh )
{
/*int *fp = NULL;*/
int i, block = 1;
struct iovec *iov = NULL;
int iov_count = 0;
OMPI_MPI_OFFSET_TYPE iov_offset = 0;
ssize_t ret_code=0, bytes_written=0;
if (NULL == fh->f_io_array) {
return OMPI_ERROR;
}
iov = (struct iovec *) malloc
(OMPIO_IOVEC_INITIAL_SIZE * sizeof (struct iovec));
if (NULL == iov) {
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
if (0 == iov_count) {
iov[iov_count].iov_base = fh->f_io_array[i].memory_address;
iov[iov_count].iov_len = fh->f_io_array[i].length;
iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset;
iov_count ++;
}
if (OMPIO_IOVEC_INITIAL_SIZE*block <= iov_count) {
block ++;
iov = (struct iovec *)realloc
(iov, OMPIO_IOVEC_INITIAL_SIZE * block *
sizeof(struct iovec));
if (NULL == iov) {
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
if (fh->f_num_of_io_entries != i+1) {
if ( (((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset +
(OPAL_PTRDIFF_TYPE)fh->f_io_array[i].length) ==
(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i+1].offset) &&
(iov_count < IOV_MAX )) {
iov[iov_count].iov_base =
fh->f_io_array[i+1].memory_address;
iov[iov_count].iov_len = fh->f_io_array[i+1].length;
iov_count ++;
continue;
}
}
/*
printf ("RANK: %d Entries: %d count: %d\n",
fh->f_rank,
fh->f_num_of_io_entries,
iov_count);
for (j=0 ; j<iov_count ; j++) {
printf ("%p %lld\n",
iov[j].iov_base,
iov[j].iov_len);
}
*/
if (-1 == lseek (fh->fd, iov_offset, SEEK_SET)) {
perror ("lseek");
return OMPI_ERROR;
}
ret_code = writev (fh->fd, iov, iov_count);
if ( 0 < ret_code ) {
bytes_written += ret_code;
}
else if (-1 == ret_code ) {
perror ("writev");
goto exit;
}
iov_count = 0;
}
exit:
if (NULL != iov) {
free (iov);
iov = NULL;
}
return bytes_written;
}