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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2017 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) 2013-2018 University of Houston. All rights reserved.
* Copyright (c) 2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "sharedfp_lockedfile.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/mca/sharedfp/sharedfp.h"
#include "ompi/mca/sharedfp/base/base.h"
#include "opal/util/fd.h"
/*Use fcntl to lock the file which stores the current position*/
#include <fcntl.h>
int
mca_sharedfp_lockedfile_seek (ompio_file_t *fh,
OMPI_MPI_OFFSET_TYPE off, int whence)
{
int ret = OMPI_SUCCESS;
struct mca_sharedfp_base_data_t *sh = NULL;
struct mca_sharedfp_lockedfile_data * lockedfile_data;
int fd_lockedfilehandle;
/* flock structure that is used to setup the desired fcntl operation */
struct flock fl;
OMPI_MPI_OFFSET_TYPE offset, end_position=0;
if(fh->f_sharedfp_data==NULL){
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek: module not initialized\n");
return OMPI_ERROR;
}
sh = fh->f_sharedfp_data;
offset = off * fh->f_etype_size;
if( 0 == fh->f_rank ){
if ( MPI_SEEK_SET == whence ){
/*don't need to read current value*/
if(offset < 0){
opal_output(0,"sharedfp_lockedfile_seek - MPI_SEEK_SET, offset must be > 0,"
" got offset=%lld.\n",offset);
return OMPI_ERROR;
}
}
else if ( MPI_SEEK_CUR == whence){
OMPI_MPI_OFFSET_TYPE current_position;
ret = mca_sharedfp_lockedfile_get_position(fh,¤t_position);
if ( OMPI_SUCCESS != ret ) {
return OMPI_ERROR;
}
offset = current_position + offset;
fflush(stdout);
if(offset < 0){
opal_output(0,"sharedfp_lockedfile_seek - MPI_SEEK_CUR, offset must be > 0, got offset=%lld.\n",offset);
return OMPI_ERROR;
}
}
else if( MPI_SEEK_END == whence ){
mca_common_ompio_file_get_size( fh,&end_position);
offset = end_position + offset;
if ( offset < 0){
opal_output(0,"sharedfp_lockedfile_seek - MPI_SEEK_CUR, offset must be > 0, got offset=%lld.\n",offset);
return OMPI_ERROR;
}
}else{
opal_output(0,"sharedfp_lockedfile_seek - whence=%i is not supported\n",whence);
return OMPI_ERROR;
}
/* Set Shared file pointer */
lockedfile_data = sh->selected_module_data;
fd_lockedfilehandle = lockedfile_data->handle;
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek: Acquiring lock...");
/* set up the flock structure */
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_pid = getpid();
/* Acquire an exclusive lock */
if ( fcntl(fd_lockedfilehandle, F_SETLKW, &fl) == -1) {
opal_output(0, "Error acquiring lock: fcntl(%d,F_SETLKW,&fl)\n",fd_lockedfilehandle);
opal_output(0,"error(%i): %s", errno, strerror(errno));
return OMPI_ERROR;
}
else{
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek: Success! acquired lock.for fd: %d\n",fd_lockedfilehandle);
}
/*-- -----------------
*write to the file
*--------------------
*/
lseek ( fd_lockedfilehandle, 0, SEEK_SET);
opal_fd_write ( fd_lockedfilehandle, sizeof(OMPI_MPI_OFFSET_TYPE), &offset);
/*-------------------
* unlock the file
*--------------------
*/
if ( mca_sharedfp_lockedfile_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek: Releasing lock...");
}
fl.l_type = F_UNLCK; /* set to unlock same region */
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_pid = getpid();
if (fcntl(fd_lockedfilehandle, F_SETLK, &fl) == -1) {
opal_output(0,"Failed to release lock for fd: %d\n",fd_lockedfilehandle);
opal_output(0,"error(%i): %s", errno, strerror(errno));
return OMPI_ERROR;
}
else{
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek: released lock.for fd: %d\n",fd_lockedfilehandle);
}
}
fh->f_comm->c_coll->coll_barrier ( fh->f_comm , fh->f_comm->c_coll->coll_barrier_module );
return OMPI_SUCCESS;
}
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