1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* 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) 2015 Cisco Systems, Inc. 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_sm.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/mca/sharedfp/sharedfp.h"
#include "ompi/mca/sharedfp/base/base.h"
/*use a semaphore to lock the shared memory location*/
#include <semaphore.h>
int
mca_sharedfp_sm_seek (ompio_file_t *fh,
OMPI_MPI_OFFSET_TYPE off, int whence)
{
int status=0;
OMPI_MPI_OFFSET_TYPE offset, end_position=0;
int ret = OMPI_SUCCESS;
struct mca_sharedfp_base_data_t *sh = NULL;
struct mca_sharedfp_sm_data * sm_data = NULL;
struct mca_sharedfp_sm_offset * sm_offset_ptr = NULL;
if( NULL == fh->f_sharedfp_data ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_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){
/*no nothing*/
if ( offset < 0){
opal_output(0,"sharedfp_sm_seek - MPI_SEEK_SET, offset must be > 0, got offset=%lld.\n",offset);
ret = -1;
}
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: MPI_SEEK_SET new_offset=%lld\n",offset);
}
}
else if( MPI_SEEK_CUR == whence){
OMPI_MPI_OFFSET_TYPE current_position;
ret = mca_sharedfp_sm_get_position ( fh, ¤t_position);
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: MPI_SEEK_CUR: curr=%lld, offset=%lld, call status=%d\n",
current_position,offset,status);
}
offset = current_position + offset;
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: MPI_SEEK_CUR: new_offset=%lld\n",offset);
}
if(offset < 0){
opal_output(0,"sharedfp_sm_seek - MPI_SEEK_CURE, offset must be > 0, got offset=%lld.\n",offset);
ret = -1;
}
}
else if( MPI_SEEK_END == whence){
end_position=0;
mca_common_ompio_file_get_size(fh,&end_position);
offset = end_position + offset;
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: MPI_SEEK_END: file_get_size=%lld\n",end_position);
}
if(offset < 0){
opal_output(0,"sharedfp_sm_seek - MPI_SEEK_CUR, offset must be > 0, got offset=%lld.\n",offset);
ret = -1;
}
}
else {
opal_output(0,"sharedfp_sm_seek - whence=%i is not supported\n",whence);
ret = -1;
}
/*-----------------------------------------------------*/
/* Set Shared file pointer */
/*-----------------------------------------------------*/
sm_data = sh->selected_module_data;
sm_offset_ptr = sm_data->sm_offset_ptr;
/*-------------------*/
/*lock the file */
/*--------------------*/
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: Acquiring lock, rank=%d...",fh->f_rank); fflush(stdout);
}
/* Acquire an exclusive lock */
sm_offset_ptr = sm_data->sm_offset_ptr;
sem_wait(sm_data->mutex);
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: Success! Acquired sm lock.for rank=%d\n",fh->f_rank);
}
sm_offset_ptr->offset=offset;
if ( mca_sharedfp_sm_verbose ) {
opal_output(ompi_sharedfp_base_framework.framework_output,
"sharedfp_sm_seek: Releasing sm lock...rank=%d",fh->f_rank); fflush(stdout);
}
sem_post(sm_data->mutex);
}
/* since we are only letting process 0, update the current pointer
* all of the other processes need to wait before proceeding.
*/
fh->f_comm->c_coll->coll_barrier ( fh->f_comm, fh->f_comm->c_coll->coll_barrier_module );
return ret;
}
|
