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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 2004 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "adio.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_AIO_H
#include <aio.h>
#endif
#ifdef HAVE_SYS_AIO_H
#include <sys/aio.h>
#endif
#include "mpiu_greq.h"
#ifdef ROMIO_HAVE_WORKING_AIO
/* ADIOI_GEN_IreadContig
*
* This code handles two distinct cases. If ROMIO_HAVE_WORKING_AIO is not
* defined, then I/O is performed in a blocking manner. Otherwise we post
* an asynchronous I/O operation using the appropriate aio routines.
*
* In the aio case we rely on ADIOI_GEN_aio(), which is implemented in
* common/ad_iwrite.c.
*/
void ADIOI_GEN_IreadContig(ADIO_File fd, void *buf, int count,
MPI_Datatype datatype, int file_ptr_type,
ADIO_Offset offset, MPI_Request *request,
int *error_code)
{
MPI_Count len, typesize;
int aio_errno = 0;
static char myname[] = "ADIOI_GEN_IREADCONTIG";
MPI_Type_size_x(datatype, &typesize);
ADIOI_Assert((count * typesize) == ((ADIO_Offset)(unsigned)count * (ADIO_Offset)typesize));
len = count * typesize;
if (file_ptr_type == ADIO_INDIVIDUAL) offset = fd->fp_ind;
aio_errno = ADIOI_GEN_aio(fd, buf, len, offset, 0, request);
if (file_ptr_type == ADIO_INDIVIDUAL) fd->fp_ind += len;
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;
}
#endif
/* Generic implementation of IreadStrided calls the blocking ReadStrided
* immediately.
*/
void ADIOI_GEN_IreadStrided(ADIO_File fd, void *buf, int count,
MPI_Datatype datatype, int file_ptr_type,
ADIO_Offset offset, ADIO_Request *request,
int *error_code)
{
ADIO_Status status;
MPI_Count typesize;
MPI_Offset nbytes=0;
/* Call the blocking function. It will create an error code
* if necessary.
*/
ADIO_ReadStrided(fd, buf, count, datatype, file_ptr_type,
offset, &status, error_code);
if (*error_code == MPI_SUCCESS) {
MPI_Type_size_x(datatype, &typesize);
nbytes = (MPI_Offset)count*(MPI_Offset)typesize;
}
MPIO_Completed_request_create(&fd, nbytes, error_code, request);
}
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