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1/* Test program for timedout read/write lock functions.
2 Copyright (C) 2000-2019 Free Software Foundation, Inc.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <error.h>
21#include <pthread.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <time.h>
25#include <unistd.h>
26
27
28#define NWRITERS 15
29#define WRITETRIES 10
30#define NREADERS 15
31#define READTRIES 15
32
33#define DELAY 1000000
34
35#ifndef KIND
36# define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
37#endif
38
39static pthread_rwlock_t lock;
40
41
42static void *
43writer_thread (void *nr)
44{
45 struct timespec delay;
46 int n;
47
48 delay.tv_sec = 0;
49 delay.tv_nsec = DELAY;
50
51 for (n = 0; n < WRITETRIES; ++n)
52 {
53 printf ("writer thread %ld tries again\n", (long int) nr);
54
55 if (pthread_rwlock_wrlock (&lock) != 0)
56 {
57 puts ("wrlock failed");
58 exit (1);
59 }
60
61 printf ("writer thread %ld succeeded\n", (long int) nr);
62
63 nanosleep (&delay, NULL);
64
65 if (pthread_rwlock_unlock (&lock) != 0)
66 {
67 puts ("unlock for writer failed");
68 exit (1);
69 }
70
71 printf ("writer thread %ld released\n", (long int) nr);
72 }
73
74 return NULL;
75}
76
77
78static void *
79reader_thread (void *nr)
80{
81 struct timespec delay;
82 int n;
83
84 delay.tv_sec = 0;
85 delay.tv_nsec = DELAY;
86
87 for (n = 0; n < READTRIES; ++n)
88 {
89 printf ("reader thread %ld tries again\n", (long int) nr);
90
91 if (pthread_rwlock_rdlock (&lock) != 0)
92 {
93 puts ("rdlock failed");
94 exit (1);
95 }
96
97 printf ("reader thread %ld succeeded\n", (long int) nr);
98
99 nanosleep (&delay, NULL);
100
101 if (pthread_rwlock_unlock (&lock) != 0)
102 {
103 puts ("unlock for reader failed");
104 exit (1);
105 }
106
107 printf ("reader thread %ld released\n", (long int) nr);
108 }
109
110 return NULL;
111}
112
113
114static int
115do_test (void)
116{
117 pthread_t thwr[NWRITERS];
118 pthread_t thrd[NREADERS];
119 int n;
120 void *res;
121 pthread_rwlockattr_t a;
122
123 if (pthread_rwlockattr_init (&a) != 0)
124 {
125 puts ("rwlockattr_t failed");
126 exit (1);
127 }
128
129 if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)
130 {
131 puts ("rwlockattr_setkind failed");
132 exit (1);
133 }
134
135 if (pthread_rwlock_init (&lock, &a) != 0)
136 {
137 puts ("rwlock_init failed");
138 exit (1);
139 }
140
141 /* Make standard error the same as standard output. */
142 dup2 (1, 2);
143
144 /* Make sure we see all message, even those on stdout. */
145 setvbuf (stdout, NULL, _IONBF, 0);
146
147 for (n = 0; n < NWRITERS; ++n)
148 if (pthread_create (&thwr[n], NULL, writer_thread,
149 (void *) (long int) n) != 0)
150 {
151 puts ("writer create failed");
152 exit (1);
153 }
154
155 for (n = 0; n < NREADERS; ++n)
156 if (pthread_create (&thrd[n], NULL, reader_thread,
157 (void *) (long int) n) != 0)
158 {
159 puts ("reader create failed");
160 exit (1);
161 }
162
163 /* Wait for all the threads. */
164 for (n = 0; n < NWRITERS; ++n)
165 if (pthread_join (thwr[n], &res) != 0)
166 {
167 puts ("writer join failed");
168 exit (1);
169 }
170 for (n = 0; n < NREADERS; ++n)
171 if (pthread_join (thrd[n], &res) != 0)
172 {
173 puts ("reader join failed");
174 exit (1);
175 }
176
177 return 0;
178}
179
180#define TIMEOUT 30
181#define TEST_FUNCTION do_test ()
182#include "../test-skeleton.c"
183

Warning: That file was not part of the compilation database. It may have many parsing errors.