Update.
[glibc.git] / nptl / tst-rwlock12.c
blob159d469afcac06b57a5022188ecb1556ce20d198
1 /* Copyright (C) 2002, 2003 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
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <pthread.h>
22 #include <stdint.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <sys/mman.h>
28 #include <sys/wait.h>
31 static int
32 do_test (void)
34 #if ! _POSIX_THREAD_PROCESS_SHARED
36 puts ("_POSIX_THREAD_PROCESS_SHARED not supported, test skipped");
37 return 0;
39 #else
41 size_t ps = sysconf (_SC_PAGESIZE);
42 char tmpfname[] = "/tmp/tst-rwlock12.XXXXXX";
43 char data[ps];
44 void *mem;
45 int fd;
46 pthread_mutex_t *m;
47 pthread_mutexattr_t ma;
48 pthread_rwlock_t *r;
49 pthread_rwlockattr_t ra;
50 pid_t pid;
51 int status = 0;
53 fd = mkstemp (tmpfname);
54 if (fd == -1)
56 printf ("cannot open temporary file: %m\n");
57 return 1;
60 /* Make sure it is always removed. */
61 unlink (tmpfname);
63 /* Create one page of data. */
64 memset (data, '\0', ps);
66 /* Write the data to the file. */
67 if (write (fd, data, ps) != (ssize_t) ps)
69 puts ("short write");
70 return 1;
73 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
74 if (mem == MAP_FAILED)
76 printf ("mmap failed: %m\n");
77 return 1;
80 r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t))
81 & ~(__alignof (pthread_rwlock_t) - 1));
82 /* The following assumes alignment for a mutex is at least as high
83 as that for a rwlock. Which is true in our case. */
84 m = (pthread_mutex_t *) (r + 1);
86 if (pthread_rwlockattr_init (&ra) != 0)
88 puts ("rwlockattr_init failed");
89 return 1;
92 if (pthread_rwlockattr_setpshared (&ra, PTHREAD_PROCESS_SHARED) != 0)
94 puts ("rwlockattr_setpshared failed");
95 return 1;
98 if (pthread_rwlock_init (r, &ra) != 0)
100 puts ("rwlock_init failed");
101 return 1;
104 if (pthread_mutexattr_init (&ma) != 0)
106 puts ("rwlockattr_init failed");
107 return 1;
110 if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
112 puts ("mutexattr_setpshared failed");
113 return 1;
116 if (pthread_mutex_init (m, &ma) != 0)
118 puts ("mutex_init failed");
119 return 1;
122 /* Lock the mutex. */
123 if (pthread_mutex_lock (m) != 0)
125 puts ("mutex_lock failed");
126 return 1;
129 puts ("going to fork now");
130 pid = fork ();
131 if (pid == -1)
133 puts ("fork failed");
134 return 1;
136 else if (pid == 0)
138 /* Lock the mutex. */
139 if (pthread_mutex_lock (m) != 0)
141 puts ("child: mutex_lock failed");
142 return 1;
145 /* Try to get the rwlock. */
146 if (pthread_rwlock_trywrlock (r) == 0)
148 puts ("rwlock_trywrlock succeeded");
149 return 1;
152 /* Try again. */
153 struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000000 };
154 int e = pthread_rwlock_timedwrlock (r, &ts);
155 if (e == 0)
157 puts ("rwlock_timedwrlock succeeded");
158 return 1;
160 if (e != ETIMEDOUT)
162 puts ("rwlock_timedwrlock didn't return ETIMEDOUT");
163 status = 1;
166 if (pthread_rwlock_tryrdlock (r) == 0)
168 puts ("rwlock_tryrdlock succeeded");
169 return 1;
172 e = pthread_rwlock_timedrdlock (r, &ts);
173 if (e == 0)
175 puts ("rwlock_timedrdlock succeeded");
176 return 1;
178 if (e != ETIMEDOUT)
180 puts ("rwlock_timedrdlock didn't return ETIMEDOUT");
181 status = 1;
184 else
186 /* Lock the rwlock for writing. */
187 if (pthread_rwlock_wrlock (r) != 0)
189 puts ("rwlock_wrlock failed");
190 kill (pid, SIGTERM);
191 return 1;
194 /* Allow the child to run. */
195 if (pthread_mutex_unlock (m) != 0)
197 puts ("mutex_unlock failed");
198 kill (pid, SIGTERM);
199 return 1;
202 /* Just wait for the child. */
203 if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
205 puts ("waitpid failed");
206 kill (pid, SIGTERM);
207 return 1;
211 return status;
212 #endif
215 #define TEST_FUNCTION do_test ()
216 #include "../test-skeleton.c"