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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "ad_pfs.h"
void ADIOI_PFS_Flush(ADIO_File fd, int *error_code)
{
int err, np_total, np_comm;
static char myname[] = "ADIOI_PFS_FLUSH";
/* fsync is not actually needed in PFS, because it uses something
called fast-path I/O. However, it doesn't do any harm either. */
err = fsync(fd->fd_sys);
if (err == -1) {
*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
myname, __LINE__, MPI_ERR_IO,
"**io",
"**io %s", strerror(errno));
}
else *error_code = MPI_SUCCESS;
/* MPI-IO requires that after an fsync all processes must see the same
file size. In PFS M_ASYNC mode, this doesn't automatically happen.
Therefore, if M_ASYNC mode, temporarily change it to M_UNIX mode
and then switch back to M_ASYNC. That updates the file size! */
MPI_Comm_size(MPI_COMM_WORLD, &np_total);
MPI_Comm_size(fd->comm, &np_comm);
if ((np_total == np_comm) && (!(fd->atomicity))) {
err = _setiomode(fd->fd_sys, M_UNIX);
err = _setiomode(fd->fd_sys, M_ASYNC);
}
/* else it is M_UNIX anyway. don't do anything. */
}
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