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1/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <pthread.h>
21#include <stdint.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <unistd.h>
26#include <sys/mman.h>
27#include <sys/wait.h>
28
29
30static int
31do_test (void)
32{
33 size_t ps = sysconf (_SC_PAGESIZE);
34 char tmpfname[] = "/tmp/tst-rwlock12.XXXXXX";
35 char data[ps];
36 void *mem;
37 int fd;
38 pthread_mutex_t *m;
39 pthread_mutexattr_t ma;
40 pthread_rwlock_t *r;
41 pthread_rwlockattr_t ra;
42 pid_t pid;
43 int status = 0;
44
45 fd = mkstemp (tmpfname);
46 if (fd == -1)
47 {
48 printf ("cannot open temporary file: %m\n");
49 return 1;
50 }
51
52 /* Make sure it is always removed. */
53 unlink (tmpfname);
54
55 /* Create one page of data. */
56 memset (data, '\0', ps);
57
58 /* Write the data to the file. */
59 if (write (fd, data, ps) != (ssize_t) ps)
60 {
61 puts ("short write");
62 return 1;
63 }
64
65 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
66 if (mem == MAP_FAILED)
67 {
68 printf ("mmap failed: %m\n");
69 return 1;
70 }
71
72 r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t))
73 & ~(__alignof (pthread_rwlock_t) - 1));
74 /* The following assumes alignment for a mutex is at least as high
75 as that for a rwlock. Which is true in our case. */
76 m = (pthread_mutex_t *) (r + 1);
77
78 if (pthread_rwlockattr_init (&ra) != 0)
79 {
80 puts ("rwlockattr_init failed");
81 return 1;
82 }
83
84 if (pthread_rwlockattr_setpshared (&ra, PTHREAD_PROCESS_SHARED) != 0)
85 {
86 puts ("rwlockattr_setpshared failed");
87 return 1;
88 }
89
90 if (pthread_rwlock_init (r, &ra) != 0)
91 {
92 puts ("rwlock_init failed");
93 return 1;
94 }
95
96 if (pthread_mutexattr_init (&ma) != 0)
97 {
98 puts ("rwlockattr_init failed");
99 return 1;
100 }
101
102 if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
103 {
104 puts ("mutexattr_setpshared failed");
105 return 1;
106 }
107
108 if (pthread_mutex_init (m, &ma) != 0)
109 {
110 puts ("mutex_init failed");
111 return 1;
112 }
113
114 /* Lock the mutex. */
115 if (pthread_mutex_lock (m) != 0)
116 {
117 puts ("mutex_lock failed");
118 return 1;
119 }
120
121 puts ("going to fork now");
122 pid = fork ();
123 if (pid == -1)
124 {
125 puts ("fork failed");
126 return 1;
127 }
128 else if (pid == 0)
129 {
130 /* Lock the mutex. */
131 if (pthread_mutex_lock (m) != 0)
132 {
133 puts ("child: mutex_lock failed");
134 return 1;
135 }
136
137 /* Try to get the rwlock. */
138 if (pthread_rwlock_trywrlock (r) == 0)
139 {
140 puts ("rwlock_trywrlock succeeded");
141 return 1;
142 }
143
144 /* Try again. */
145 struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000000 };
146 int e = pthread_rwlock_timedwrlock (r, &ts);
147 if (e == 0)
148 {
149 puts ("rwlock_timedwrlock succeeded");
150 return 1;
151 }
152 if (e != ETIMEDOUT)
153 {
154 puts ("rwlock_timedwrlock didn't return ETIMEDOUT");
155 status = 1;
156 }
157
158 if (pthread_rwlock_tryrdlock (r) == 0)
159 {
160 puts ("rwlock_tryrdlock succeeded");
161 return 1;
162 }
163
164 e = pthread_rwlock_timedrdlock (r, &ts);
165 if (e == 0)
166 {
167 puts ("rwlock_timedrdlock succeeded");
168 return 1;
169 }
170 if (e != ETIMEDOUT)
171 {
172 puts ("rwlock_timedrdlock didn't return ETIMEDOUT");
173 status = 1;
174 }
175 }
176 else
177 {
178 /* Lock the rwlock for writing. */
179 if (pthread_rwlock_wrlock (r) != 0)
180 {
181 puts ("rwlock_wrlock failed");
182 kill (pid, SIGTERM);
183 return 1;
184 }
185
186 /* Allow the child to run. */
187 if (pthread_mutex_unlock (m) != 0)
188 {
189 puts ("mutex_unlock failed");
190 kill (pid, SIGTERM);
191 return 1;
192 }
193
194 /* Just wait for the child. */
195 if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
196 {
197 puts ("waitpid failed");
198 kill (pid, SIGTERM);
199 return 1;
200 }
201 }
202
203 return status;
204}
205
206#define TEST_FUNCTION do_test ()
207#include "../test-skeleton.c"
208

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