[BZ #2172]
[glibc.git] / nptl / tst-rwlock12.c
blob91f25d3b1e68ee52f68545b4ade4df90ecec9c24
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
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 size_t ps = sysconf (_SC_PAGESIZE);
35 char tmpfname[] = "/tmp/tst-rwlock12.XXXXXX";
36 char data[ps];
37 void *mem;
38 int fd;
39 pthread_mutex_t *m;
40 pthread_mutexattr_t ma;
41 pthread_rwlock_t *r;
42 pthread_rwlockattr_t ra;
43 pid_t pid;
44 int status = 0;
46 fd = mkstemp (tmpfname);
47 if (fd == -1)
49 printf ("cannot open temporary file: %m\n");
50 return 1;
53 /* Make sure it is always removed. */
54 unlink (tmpfname);
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)
62 puts ("short write");
63 return 1;
66 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
67 if (mem == MAP_FAILED)
69 printf ("mmap failed: %m\n");
70 return 1;
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");
82 return 1;
85 if (pthread_rwlockattr_setpshared (&ra, PTHREAD_PROCESS_SHARED) != 0)
87 puts ("rwlockattr_setpshared failed");
88 return 1;
91 if (pthread_rwlock_init (r, &ra) != 0)
93 puts ("rwlock_init failed");
94 return 1;
97 if (pthread_mutexattr_init (&ma) != 0)
99 puts ("rwlockattr_init failed");
100 return 1;
103 if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
105 puts ("mutexattr_setpshared failed");
106 return 1;
109 if (pthread_mutex_init (m, &ma) != 0)
111 puts ("mutex_init failed");
112 return 1;
115 /* Lock the mutex. */
116 if (pthread_mutex_lock (m) != 0)
118 puts ("mutex_lock failed");
119 return 1;
122 puts ("going to fork now");
123 pid = fork ();
124 if (pid == -1)
126 puts ("fork failed");
127 return 1;
129 else if (pid == 0)
131 /* Lock the mutex. */
132 if (pthread_mutex_lock (m) != 0)
134 puts ("child: mutex_lock failed");
135 return 1;
138 /* Try to get the rwlock. */
139 if (pthread_rwlock_trywrlock (r) == 0)
141 puts ("rwlock_trywrlock succeeded");
142 return 1;
145 /* Try again. */
146 struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000000 };
147 int e = pthread_rwlock_timedwrlock (r, &ts);
148 if (e == 0)
150 puts ("rwlock_timedwrlock succeeded");
151 return 1;
153 if (e != ETIMEDOUT)
155 puts ("rwlock_timedwrlock didn't return ETIMEDOUT");
156 status = 1;
159 if (pthread_rwlock_tryrdlock (r) == 0)
161 puts ("rwlock_tryrdlock succeeded");
162 return 1;
165 e = pthread_rwlock_timedrdlock (r, &ts);
166 if (e == 0)
168 puts ("rwlock_timedrdlock succeeded");
169 return 1;
171 if (e != ETIMEDOUT)
173 puts ("rwlock_timedrdlock didn't return ETIMEDOUT");
174 status = 1;
177 else
179 /* Lock the rwlock for writing. */
180 if (pthread_rwlock_wrlock (r) != 0)
182 puts ("rwlock_wrlock failed");
183 kill (pid, SIGTERM);
184 return 1;
187 /* Allow the child to run. */
188 if (pthread_mutex_unlock (m) != 0)
190 puts ("mutex_unlock failed");
191 kill (pid, SIGTERM);
192 return 1;
195 /* Just wait for the child. */
196 if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
198 puts ("waitpid failed");
199 kill (pid, SIGTERM);
200 return 1;
204 return status;
207 #define TEST_FUNCTION do_test ()
208 #include "../test-skeleton.c"