1 /* Copyright (C) 2002, 2003, 2004 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
34 size_t ps
= sysconf (_SC_PAGESIZE
);
35 char tmpfname
[] = "/tmp/tst-rwlock12.XXXXXX";
40 pthread_mutexattr_t ma
;
42 pthread_rwlockattr_t ra
;
46 fd
= mkstemp (tmpfname
);
49 printf ("cannot open temporary file: %m\n");
53 /* Make sure it is always removed. */
56 /* Create one page of data. */
57 memset (data
, '\0', ps
);
59 /* Write the data to the file. */
60 if (write (fd
, data
, ps
) != (ssize_t
) ps
)
66 mem
= mmap (NULL
, ps
, PROT_READ
| PROT_WRITE
, MAP_SHARED
, fd
, 0);
67 if (mem
== MAP_FAILED
)
69 printf ("mmap failed: %m\n");
73 r
= (pthread_rwlock_t
*) (((uintptr_t) mem
+ __alignof (pthread_rwlock_t
))
74 & ~(__alignof (pthread_rwlock_t
) - 1));
75 /* The following assumes alignment for a mutex is at least as high
76 as that for a rwlock. Which is true in our case. */
77 m
= (pthread_mutex_t
*) (r
+ 1);
79 if (pthread_rwlockattr_init (&ra
) != 0)
81 puts ("rwlockattr_init failed");
85 if (pthread_rwlockattr_setpshared (&ra
, PTHREAD_PROCESS_SHARED
) != 0)
87 puts ("rwlockattr_setpshared failed");
91 if (pthread_rwlock_init (r
, &ra
) != 0)
93 puts ("rwlock_init failed");
97 if (pthread_mutexattr_init (&ma
) != 0)
99 puts ("rwlockattr_init failed");
103 if (pthread_mutexattr_setpshared (&ma
, PTHREAD_PROCESS_SHARED
) != 0)
105 puts ("mutexattr_setpshared failed");
109 if (pthread_mutex_init (m
, &ma
) != 0)
111 puts ("mutex_init failed");
115 /* Lock the mutex. */
116 if (pthread_mutex_lock (m
) != 0)
118 puts ("mutex_lock failed");
122 puts ("going to fork now");
126 puts ("fork failed");
131 /* Lock the mutex. */
132 if (pthread_mutex_lock (m
) != 0)
134 puts ("child: mutex_lock failed");
138 /* Try to get the rwlock. */
139 if (pthread_rwlock_trywrlock (r
) == 0)
141 puts ("rwlock_trywrlock succeeded");
146 struct timespec ts
= { .tv_sec
= 0, .tv_nsec
= 500000000 };
147 int e
= pthread_rwlock_timedwrlock (r
, &ts
);
150 puts ("rwlock_timedwrlock succeeded");
155 puts ("rwlock_timedwrlock didn't return ETIMEDOUT");
159 if (pthread_rwlock_tryrdlock (r
) == 0)
161 puts ("rwlock_tryrdlock succeeded");
165 e
= pthread_rwlock_timedrdlock (r
, &ts
);
168 puts ("rwlock_timedrdlock succeeded");
173 puts ("rwlock_timedrdlock didn't return ETIMEDOUT");
179 /* Lock the rwlock for writing. */
180 if (pthread_rwlock_wrlock (r
) != 0)
182 puts ("rwlock_wrlock failed");
187 /* Allow the child to run. */
188 if (pthread_mutex_unlock (m
) != 0)
190 puts ("mutex_unlock failed");
195 /* Just wait for the child. */
196 if (TEMP_FAILURE_RETRY (waitpid (pid
, &status
, 0)) != pid
)
198 puts ("waitpid failed");
207 #define TEST_FUNCTION do_test ()
208 #include "../test-skeleton.c"