1/* Test program for timedout read/write lock functions.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, see <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <error.h>
20#include <pthread.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <time.h>
24#include <unistd.h>
25
26
27#define NWRITERS 15
28#define WRITETRIES 10
29#define NREADERS 15
30#define READTRIES 15
31
32#define DELAY 1000000
33
34#ifndef KIND
35# define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
36#endif
37
38static pthread_rwlock_t lock;
39
40
41static void *
42writer_thread (void *nr)
43{
44 struct timespec delay;
45 int n;
46
47 delay.tv_sec = 0;
48 delay.tv_nsec = DELAY;
49
50 for (n = 0; n < WRITETRIES; ++n)
51 {
52 printf (format: "writer thread %ld tries again\n", (long int) nr);
53
54 if (pthread_rwlock_wrlock (rwlock: &lock) != 0)
55 {
56 puts (s: "wrlock failed");
57 exit (1);
58 }
59
60 printf (format: "writer thread %ld succeeded\n", (long int) nr);
61
62 nanosleep (requested_time: &delay, NULL);
63
64 if (pthread_rwlock_unlock (rwlock: &lock) != 0)
65 {
66 puts (s: "unlock for writer failed");
67 exit (1);
68 }
69
70 printf (format: "writer thread %ld released\n", (long int) nr);
71 }
72
73 return NULL;
74}
75
76
77static void *
78reader_thread (void *nr)
79{
80 struct timespec delay;
81 int n;
82
83 delay.tv_sec = 0;
84 delay.tv_nsec = DELAY;
85
86 for (n = 0; n < READTRIES; ++n)
87 {
88 printf (format: "reader thread %ld tries again\n", (long int) nr);
89
90 if (pthread_rwlock_rdlock (rwlock: &lock) != 0)
91 {
92 puts (s: "rdlock failed");
93 exit (1);
94 }
95
96 printf (format: "reader thread %ld succeeded\n", (long int) nr);
97
98 nanosleep (requested_time: &delay, NULL);
99
100 if (pthread_rwlock_unlock (rwlock: &lock) != 0)
101 {
102 puts (s: "unlock for reader failed");
103 exit (1);
104 }
105
106 printf (format: "reader thread %ld released\n", (long int) nr);
107 }
108
109 return NULL;
110}
111
112
113static int
114do_test (void)
115{
116 pthread_t thwr[NWRITERS];
117 pthread_t thrd[NREADERS];
118 int n;
119 void *res;
120 pthread_rwlockattr_t a;
121
122 if (pthread_rwlockattr_init (attr: &a) != 0)
123 {
124 puts (s: "rwlockattr_t failed");
125 exit (1);
126 }
127
128 if (pthread_rwlockattr_setkind_np (attr: &a, KIND) != 0)
129 {
130 puts (s: "rwlockattr_setkind failed");
131 exit (1);
132 }
133
134 if (pthread_rwlock_init (rwlock: &lock, attr: &a) != 0)
135 {
136 puts (s: "rwlock_init failed");
137 exit (1);
138 }
139
140 /* Make standard error the same as standard output. */
141 dup2 (fd: 1, fd2: 2);
142
143 /* Make sure we see all message, even those on stdout. */
144 setvbuf (stdout, NULL, _IONBF, n: 0);
145
146 for (n = 0; n < NWRITERS; ++n)
147 if (pthread_create (newthread: &thwr[n], NULL, start_routine: writer_thread,
148 arg: (void *) (long int) n) != 0)
149 {
150 puts (s: "writer create failed");
151 exit (1);
152 }
153
154 for (n = 0; n < NREADERS; ++n)
155 if (pthread_create (newthread: &thrd[n], NULL, start_routine: reader_thread,
156 arg: (void *) (long int) n) != 0)
157 {
158 puts (s: "reader create failed");
159 exit (1);
160 }
161
162 /* Wait for all the threads. */
163 for (n = 0; n < NWRITERS; ++n)
164 if (pthread_join (th: thwr[n], thread_return: &res) != 0)
165 {
166 puts (s: "writer join failed");
167 exit (1);
168 }
169 for (n = 0; n < NREADERS; ++n)
170 if (pthread_join (th: thrd[n], thread_return: &res) != 0)
171 {
172 puts (s: "reader join failed");
173 exit (1);
174 }
175
176 return 0;
177}
178
179#define TIMEOUT 30
180#define TEST_FUNCTION do_test ()
181#include "../test-skeleton.c"
182

source code of glibc/nptl/tst-rwlock8.c