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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) 2004-2005 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 University of Houston. 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"
/*Use fcntl to lock the file which stores the current position*/
#include <fcntl.h>
int
mca_sharedfp_lockedfile_seek (mca_io_ompio_file_t *fh,
OMPI_MPI_OFFSET_TYPE offset, int whence)
{
int rank;
int ret = OMPI_SUCCESS;
struct mca_sharedfp_base_data_t *sh = NULL;
mca_sharedfp_base_module_t * shared_fp_base_module;
struct mca_sharedfp_lockedfile_data * lockedfile_data;
int fd_lockedfilehandle;
/* flock structure that is used to setup the desired fcntl operation */
struct flock fl;
if(fh->f_sharedfp_data==NULL){
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_lockedfile_seek - opening the shared file pointer\n");
shared_fp_base_module = fh->f_sharedfp;
ret = shared_fp_base_module->sharedfp_file_open(fh->f_comm,
fh->f_filename,
fh->f_amode,
fh->f_info,
fh);
if (ret != OMPI_SUCCESS) {
opal_output(0,"sharedfp_lockedfile_seek - error opening the shared file pointer\n");
return ret;
}
}
sh = fh->f_sharedfp_data;
rank = ompi_comm_rank ( sh->comm );
if( 0 == 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);
ret = -1;
}
opal_output(ompi_sharedfp_base_framework.framework_output,"MPI_SEEK_SET: new_offset=%lld\n",offset);
fflush(stdout);
}
else if ( MPI_SEEK_CUR == whence){
OMPI_MPI_OFFSET_TYPE current_position;
int status = mca_sharedfp_lockedfile_get_position(fh,¤t_position);
opal_output(ompi_sharedfp_base_framework.framework_output,
"MPI_SEEK_CUR: curr=%lld, offset=%lld, call status=%d\n",current_position,offset,status);
offset = current_position + offset;
opal_output(ompi_sharedfp_base_framework.framework_output,
"MPI_SEEK_CUR: new_offset=%lld\n",offset);
fflush(stdout);
if(offset < 0){
opal_output(0,"sharedfp_lockedfile_seek - MPI_SEEK_CURE, offset must be > 0, got offset=%lld.\n",offset);
ret = -1;
}
}
else if( MPI_SEEK_END == whence ){
OMPI_MPI_OFFSET_TYPE end_position=0;
ompio_io_ompio_file_get_size(sh->sharedfh,&end_position);
offset = end_position + offset;
opal_output(ompi_sharedfp_base_framework.framework_output,
"MPI_SEEK_END: file_get_size=%lld\n",end_position);
if ( offset < 0){
opal_output(0,"sharedfp_lockedfile_seek - MPI_SEEK_CUR, offset must be > 0, got offset=%lld.\n",offset);
ret = -1;
}
}else{
opal_output(0,"sharedfp_lockedfile_seek - whence=%i is not supported\n",whence);
ret = -1;
}
/* 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: Aquiring 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();
/* Aquire an exclusive lock */
if ( fcntl(fd_lockedfilehandle, F_SETLKW, &fl) == -1) {
opal_output(0, "Erorr 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);
write ( fd_lockedfilehandle, &offset, sizeof(OMPI_MPI_OFFSET_TYPE));
/*-------------------
* 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);
}
}
sh->comm->c_coll.coll_barrier ( sh->comm , sh->comm->c_coll.coll_barrier_module );
return ret;
}
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