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
|
/* This file is part of the Zebra server.
Copyright (C) Index Data
Zebra is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** \file tstlockscope.c
\brief tests scope of fcntl locks.. Either "process" or "thread"
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <yaz/log.h>
#include <yaz/test.h>
#include <fcntl.h>
#if YAZ_POSIX_THREADS
#include <pthread.h>
#endif
int fd;
const char *scope = "unknown";
static int file_lock(int fd, int type, int cmd)
{
struct flock area;
area.l_type = type;
area.l_whence = SEEK_SET;
area.l_len = area.l_start = 0L;
return fcntl(fd, cmd, &area);
}
void *run_func(void *arg)
{
if (file_lock(fd, F_WRLCK, F_SETLK) == -1)
scope = "thread";
else
scope = "process";
return 0;
}
void tst(void)
{
pthread_t child_thread;
int r;
fd = open("my.LCK", (O_CREAT|O_RDWR), 0666);
YAZ_CHECK(fd != -1);
if (fd == -1)
{
yaz_log(YLOG_FATAL|YLOG_ERRNO, "open");
return;
}
r = file_lock(fd, F_WRLCK, F_SETLKW);
YAZ_CHECK(r != -1);
if (r == -1)
{
yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcnt");
return;
}
#if YAZ_POSIX_THREADS
pthread_create(&child_thread, 0 /* attr */, run_func, 0);
pthread_join(child_thread, 0);
#endif
yaz_log(YLOG_LOG, "fcntl lock scope: %s", scope);
}
int main(int argc, char **argv)
{
YAZ_CHECK_INIT(argc, argv);
YAZ_CHECK_LOG();
tst();
YAZ_CHECK_TERM;
return 0;
}
/*
* Local variables:
* c-basic-offset: 4
* c-file-style: "Stroustrup"
* indent-tabs-mode: nil
* End:
* vim: shiftwidth=4 tabstop=8 expandtab
*/
|
