1 /* Copyright (C) 2002-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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.
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.
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/>. */
33 size_t ps = sysconf (_SC_PAGESIZE);
34 char tmpfname[] = "/tmp/tst-rwlock12.XXXXXX";
39 pthread_mutexattr_t ma;
41 pthread_rwlockattr_t ra;
45 fd = mkstemp (tmpfname);
48 printf ("cannot open temporary file: %m\n");
52 /* Make sure it is always removed. */
55 /* Create one page of data. */
56 memset (data, '\0', ps);
58 /* Write the data to the file. */
59 if (write (fd, data, ps) != (ssize_t) ps)
65 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
66 if (mem == MAP_FAILED)
68 printf ("mmap failed: %m\n");
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);
78 if (pthread_rwlockattr_init (&ra) != 0)
80 puts ("rwlockattr_init failed");
84 if (pthread_rwlockattr_setpshared (&ra, PTHREAD_PROCESS_SHARED) != 0)
86 puts ("rwlockattr_setpshared failed");
90 if (pthread_rwlock_init (r, &ra) != 0)
92 puts ("rwlock_init failed");
96 if (pthread_mutexattr_init (&ma) != 0)
98 puts ("rwlockattr_init failed");
102 if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
104 puts ("mutexattr_setpshared failed");
108 if (pthread_mutex_init (m, &ma) != 0)
110 puts ("mutex_init failed");
114 /* Lock the mutex. */
115 if (pthread_mutex_lock (m) != 0)
117 puts ("mutex_lock failed");
121 puts ("going to fork now");
125 puts ("fork failed");
130 /* Lock the mutex. */
131 if (pthread_mutex_lock (m) != 0)
133 puts ("child: mutex_lock failed");
137 /* Try to get the rwlock. */
138 if (pthread_rwlock_trywrlock (r) == 0)
140 puts ("rwlock_trywrlock succeeded");
145 struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000000 };
146 int e = pthread_rwlock_timedwrlock (r, &ts);
149 puts ("rwlock_timedwrlock succeeded");
154 puts ("rwlock_timedwrlock didn't return ETIMEDOUT");
158 if (pthread_rwlock_tryrdlock (r) == 0)
160 puts ("rwlock_tryrdlock succeeded");
164 e = pthread_rwlock_timedrdlock (r, &ts);
167 puts ("rwlock_timedrdlock succeeded");
172 puts ("rwlock_timedrdlock didn't return ETIMEDOUT");
178 /* Lock the rwlock for writing. */
179 if (pthread_rwlock_wrlock (r) != 0)
181 puts ("rwlock_wrlock failed");
186 /* Allow the child to run. */
187 if (pthread_mutex_unlock (m) != 0)
189 puts ("mutex_unlock failed");
194 /* Just wait for the child. */
195 if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
197 puts ("waitpid failed");
206 #define TEST_FUNCTION do_test ()
207 #include "../test-skeleton.c"