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
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "ad_nfs.h"
/* returns the current location of the shared_fp in terms of the
no. of etypes relative to the current view, and also increments the
shared_fp by the number of etypes to be accessed (incr) in the read
or write following this function. */
void ADIOI_NFS_Get_shared_fp(ADIO_File fd, ADIO_Offset incr, ADIO_Offset * shared_fp,
int *error_code)
{
ADIO_Offset new_fp;
ssize_t err;
MPI_Comm dupcommself;
static char myname[] = "ADIOI_NFS_GET_SHARED_FP";
if (fd->shared_fp_fd == ADIO_FILE_NULL) {
MPI_Comm_dup(MPI_COMM_SELF, &dupcommself);
fd->shared_fp_fd = ADIO_Open(MPI_COMM_SELF, dupcommself,
fd->shared_fp_fname,
fd->file_system,
fd->fns,
ADIO_CREATE | ADIO_RDWR | ADIO_DELETE_ON_CLOSE,
0, MPI_BYTE, MPI_BYTE, MPI_INFO_NULL,
ADIO_PERM_NULL, error_code);
if (*error_code != MPI_SUCCESS)
return;
*shared_fp = 0;
ADIOI_WRITE_LOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_a, 0, NULL);
#endif
err = read(fd->shared_fp_fd->fd_sys, shared_fp, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_b, 0, NULL);
#endif
/* if the file is empty, the above read may return error
* (reading beyond end of file). In that case, shared_fp = 0,
* set above, is the correct value. */
} else {
ADIOI_WRITE_LOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_lseek_a, 0, NULL);
#endif
err = lseek(fd->shared_fp_fd->fd_sys, 0, SEEK_SET);
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_lseek_b, 0, NULL);
#endif
if (err == 0) {
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_a, 0, NULL);
#endif
err = read(fd->shared_fp_fd->fd_sys, shared_fp, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_read_b, 0, NULL);
#endif
}
if (err == -1) {
ADIOI_UNLOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
*error_code = MPIO_Err_create_code(MPI_SUCCESS,
MPIR_ERR_RECOVERABLE, myname,
__LINE__, MPI_ERR_IO, "**io",
"**io %s", strerror(errno));
return;
}
}
if (incr == 0) {
goto done;
}
new_fp = *shared_fp + incr;
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_lseek_a, 0, NULL);
#endif
err = lseek(fd->shared_fp_fd->fd_sys, 0, SEEK_SET);
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_lseek_b, 0, NULL);
#endif
if (err == 0) {
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_write_a, 0, NULL);
#endif
err = write(fd->shared_fp_fd->fd_sys, &new_fp, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event(ADIOI_MPE_write_b, 0, NULL);
#endif
}
done:
ADIOI_UNLOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
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;
}
|
