115 строки
3.3 KiB
C
115 строки
3.3 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2011 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2008-2014 University of Houston. All rights reserved.
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* Copyright (c) 2015 Research Organization for Information Science
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* and Technology (RIST). All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "fbtl_posix.h"
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#include "mpi.h"
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#include <unistd.h>
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#include <limits.h>
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#include "ompi/constants.h"
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#include "ompi/mca/fbtl/fbtl.h"
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ssize_t mca_fbtl_posix_preadv (mca_io_ompio_file_t *fh )
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{
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/*int *fp = NULL;*/
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int i, block=1;
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struct iovec *iov = NULL;
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int iov_count = 0;
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OMPI_MPI_OFFSET_TYPE iov_offset = 0;
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ssize_t bytes_read=0, ret_code=0;
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if (NULL == fh->f_io_array) {
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return OMPI_ERROR;
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}
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iov = (struct iovec *) malloc
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(OMPIO_IOVEC_INITIAL_SIZE * sizeof (struct iovec));
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if (NULL == iov) {
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opal_output(1, "OUT OF MEMORY\n");
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
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if (0 == iov_count) {
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iov[iov_count].iov_base = fh->f_io_array[i].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[i].length;
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iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset;
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iov_count ++;
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}
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if (OMPIO_IOVEC_INITIAL_SIZE*block <= iov_count) {
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block ++;
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iov = (struct iovec *)realloc
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(iov, OMPIO_IOVEC_INITIAL_SIZE * block *
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sizeof(struct iovec));
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if (NULL == iov) {
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opal_output(1, "OUT OF MEMORY\n");
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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}
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if (fh->f_num_of_io_entries != i+1) {
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if (((((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset +
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(OPAL_PTRDIFF_TYPE)fh->f_io_array[i].length) ==
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(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i+1].offset)) &&
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(iov_count < IOV_MAX ) ){
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iov[iov_count].iov_base =
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fh->f_io_array[i+1].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[i+1].length;
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iov_count ++;
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continue;
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}
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}
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#if defined(HAVE_PREADV)
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ret_code = preadv (fh->fd, iov, iov_count, iov_offset);
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if ( 0 < ret_code ) {
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bytes_read+=ret_code;
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}
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#else
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if (-1 == lseek (fh->fd, iov_offset, SEEK_SET)) {
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opal_output(1, "lseek:%s", strerror(errno));
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free(iov);
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return OMPI_ERROR;
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}
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ret_code = readv (fh->fd, iov, iov_count);
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if ( 0 < ret_code ) {
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bytes_read+=ret_code;
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}
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#endif
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else if ( ret_code == -1 ) {
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opal_output(1, "readv:%s", strerror(errno));
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free(iov);
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return OMPI_ERROR;
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}
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else if ( 0 == ret_code ){
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/* end of file reached, no point in continue reading; */
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break;
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}
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iov_count = 0;
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}
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free (iov);
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return bytes_read;
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}
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