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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "adio.h"
#include <unistd.h>
#ifdef AGGREGATION_PROFILE
#include "mpe.h"
#endif
#ifdef ROMIO_GPFS
#include "adio/ad_gpfs/ad_gpfs_tuning.h"
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
void ADIOI_GEN_ReadContig(ADIO_File fd, void *buf, int count,
MPI_Datatype datatype, int file_ptr_type,
ADIO_Offset offset, ADIO_Status * status, int *error_code)
{
ssize_t err = -1;
MPI_Count datatype_size;
ADIO_Offset len, bytes_xfered = 0;
size_t rd_count;
static char myname[] = "ADIOI_GEN_READCONTIG";
#ifdef ROMIO_GPFS
double io_time = 0;
#endif
char *p;
#ifdef AGGREGATION_PROFILE
MPE_Log_event(5034, 0, NULL);
#endif
if (count == 0) {
err = 0;
goto fn_exit;
}
MPI_Type_size_x(datatype, &datatype_size);
len = datatype_size * (ADIO_Offset) count;
#ifdef ROMIO_GPFS
io_time = MPI_Wtime();
if (gpfsmpio_timing) {
gpfsmpio_prof_cr[GPFSMPIO_CIO_DATA_SIZE] += len;
}
#endif
if (file_ptr_type == ADIO_INDIVIDUAL) {
offset = fd->fp_ind;
}
p = buf;
while (bytes_xfered < len) {
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_a, 0, NULL);
#endif
rd_count = len - bytes_xfered;
/* stupid FreeBSD and Darwin do not like a count larger than a signed
* int, even though size_t is eight bytes... */
if (rd_count > INT_MAX)
rd_count = INT_MAX;
#ifdef ROMIO_GPFS
if (gpfsmpio_devnullio)
err = pread(fd->null_fd, p, rd_count, offset + bytes_xfered);
else
#endif
err = pread(fd->fd_sys, p, rd_count, offset + bytes_xfered);
/* --BEGIN ERROR HANDLING-- */
if (err == -1) {
*error_code = MPIO_Err_create_code(MPI_SUCCESS,
MPIR_ERR_RECOVERABLE,
myname, __LINE__,
MPI_ERR_IO, "**io", "**io %s", strerror(errno));
fd->fp_sys_posn = -1;
return;
}
/* --END ERROR HANDLING-- */
if (err == 0) {
/* end of file */
break;
}
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_b, 0, NULL);
#endif
bytes_xfered += err;
p += err;
}
#ifdef ROMIO_GPFS
if (gpfsmpio_timing)
gpfsmpio_prof_cr[GPFSMPIO_CIO_T_POSI_RW] += (MPI_Wtime() - io_time);
#endif
fd->fp_sys_posn = offset + bytes_xfered;
if (file_ptr_type == ADIO_INDIVIDUAL) {
fd->fp_ind += bytes_xfered;
}
fn_exit:
#ifdef HAVE_STATUS_SET_BYTES
/* what if we only read half a datatype? */
/* bytes_xfered could be larger than int */
if (err != -1)
MPIR_Status_set_bytes(status, datatype, bytes_xfered);
#endif
*error_code = MPI_SUCCESS;
#ifdef AGGREGATION_PROFILE
MPE_Log_event(5035, 0, NULL);
#endif
#ifdef ROMIO_GPFS
if (gpfsmpio_timing)
gpfsmpio_prof_cr[GPFSMPIO_CIO_T_MPIO_RW] += (MPI_Wtime() - io_time);
#endif
}
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