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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* Test program for timedout read/write lock functions.
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define NWRITERS 15
#define WRITETRIES 10
#define NREADERS 15
#define READTRIES 15
#define DELAY 1000000
#ifndef INIT
# define INIT PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
#endif
static pthread_rwlock_t lock = INIT;
static void *
writer_thread (void *nr)
{
struct timespec delay;
int n;
delay.tv_sec = 0;
delay.tv_nsec = DELAY;
for (n = 0; n < WRITETRIES; ++n)
{
printf ("writer thread %ld tries again\n", (long int) nr);
if (pthread_rwlock_wrlock (&lock) != 0)
{
puts ("wrlock failed");
exit (1);
}
printf ("writer thread %ld succeeded\n", (long int) nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
{
puts ("unlock for writer failed");
exit (1);
}
printf ("writer thread %ld released\n", (long int) nr);
}
return NULL;
}
static void *
reader_thread (void *nr)
{
struct timespec delay;
int n;
delay.tv_sec = 0;
delay.tv_nsec = DELAY;
for (n = 0; n < READTRIES; ++n)
{
printf ("reader thread %ld tries again\n", (long int) nr);
if (pthread_rwlock_rdlock (&lock) != 0)
{
puts ("rdlock failed");
exit (1);
}
printf ("reader thread %ld succeeded\n", (long int) nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
{
puts ("unlock for reader failed");
exit (1);
}
printf ("reader thread %ld released\n", (long int) nr);
}
return NULL;
}
static int
do_test (void)
{
pthread_t thwr[NWRITERS];
pthread_t thrd[NREADERS];
int n;
void *res;
/* Make standard error the same as standard output. */
dup2 (1, 2);
/* Make sure we see all message, even those on stdout. */
setvbuf (stdout, NULL, _IONBF, 0);
for (n = 0; n < NWRITERS; ++n)
if (pthread_create (&thwr[n], NULL, writer_thread,
(void *) (long int) n) != 0)
{
puts ("writer create failed");
exit (1);
}
for (n = 0; n < NREADERS; ++n)
if (pthread_create (&thrd[n], NULL, reader_thread,
(void *) (long int) n) != 0)
{
puts ("reader create failed");
exit (1);
}
/* Wait for all the threads. */
for (n = 0; n < NWRITERS; ++n)
if (pthread_join (thwr[n], &res) != 0)
{
puts ("writer join failed");
exit (1);
}
for (n = 0; n < NREADERS; ++n)
if (pthread_join (thrd[n], &res) != 0)
{
puts ("reader join failed");
exit (1);
}
return 0;
}
#define TIMEOUT 30
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
