1 /* Test program for timedout read/write lock functions.
2 Copyright (C) 2000-2023 Free Software Foundation, Inc.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, see <https://www.gnu.org/licenses/>. */
26 #include <support/check.h>
27 #include <support/timespec.h>
28 #include <support/xthread.h>
36 static const struct timespec timeout = { 0,1000000 };
37 static const struct timespec delay = { 0, 1000000 };
40 # define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
43 /* A bogus clock value that tells the tests to use pthread_rwlock_timedrdlock
44 and pthread_rwlock_timedwrlock rather than pthread_rwlock_clockrdlock and
45 pthread_rwlock_clockwrlock. */
46 #define CLOCK_USE_TIMEDLOCK (-1)
48 static pthread_rwlock_t lock;
58 writer_thread (void *arg)
60 struct thread_args *args = arg;
61 const int nr = args->nr;
62 const clockid_t clockid = args->clockid;
63 const clockid_t clockid_for_get =
64 (clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
65 const char *fnname = args->fnname;
70 for (n = 0; n < WRITETRIES; ++n)
75 xclock_gettime (clockid_for_get, &ts);
77 ts = timespec_add (ts, timeout);
78 ts = timespec_add (ts, timeout);
80 printf ("writer thread %d tries again\n", nr);
82 e = (clockid == CLOCK_USE_TIMEDLOCK)
83 ? pthread_rwlock_timedwrlock (&lock, &ts)
84 : pthread_rwlock_clockwrlock (&lock, clockid, &ts);
85 if (e != 0 && e != ETIMEDOUT)
86 FAIL_EXIT1 ("%swrlock failed", fnname);
88 while (e == ETIMEDOUT);
90 printf ("writer thread %d succeeded\n", nr);
92 nanosleep (&delay, NULL);
94 if (pthread_rwlock_unlock (&lock) != 0)
95 FAIL_EXIT1 ("unlock for writer failed");
97 printf ("writer thread %d released\n", nr);
105 reader_thread (void *arg)
107 struct thread_args *args = arg;
108 const int nr = args->nr;
109 const clockid_t clockid = args->clockid;
110 const clockid_t clockid_for_get =
111 (clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
112 const char *fnname = args->fnname;
117 for (n = 0; n < READTRIES; ++n)
122 xclock_gettime (clockid_for_get, &ts);
124 ts = timespec_add (ts, timeout);
126 printf ("reader thread %d tries again\n", nr);
128 if (clockid == CLOCK_USE_TIMEDLOCK)
129 e = pthread_rwlock_timedrdlock (&lock, &ts);
131 e = pthread_rwlock_clockrdlock (&lock, clockid, &ts);
132 if (e != 0 && e != ETIMEDOUT)
133 FAIL_EXIT1 ("%srdlock failed", fnname);
135 while (e == ETIMEDOUT);
137 printf ("reader thread %d succeeded\n", nr);
139 nanosleep (&delay, NULL);
141 if (pthread_rwlock_unlock (&lock) != 0)
142 FAIL_EXIT1 ("unlock for reader failed");
144 printf ("reader thread %d released\n", nr);
152 do_test_clock (clockid_t clockid, const char *fnname)
154 pthread_t thwr[NWRITERS];
155 pthread_t thrd[NREADERS];
157 pthread_rwlockattr_t a;
159 if (pthread_rwlockattr_init (&a) != 0)
160 FAIL_EXIT1 ("rwlockattr_t failed");
162 if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)
163 FAIL_EXIT1 ("rwlockattr_setkind failed");
165 if (pthread_rwlock_init (&lock, &a) != 0)
166 FAIL_EXIT1 ("rwlock_init failed");
168 /* Make standard error the same as standard output. */
171 /* Make sure we see all message, even those on stdout. */
172 setvbuf (stdout, NULL, _IONBF, 0);
174 struct thread_args wargs[NWRITERS];
175 for (n = 0; n < NWRITERS; ++n) {
177 wargs[n].clockid = clockid;
178 wargs[n].fnname = fnname;
179 thwr[n] = xpthread_create (NULL, writer_thread, &wargs[n]);
182 struct thread_args rargs[NREADERS];
183 for (n = 0; n < NREADERS; ++n) {
185 rargs[n].clockid = clockid;
186 rargs[n].fnname = fnname;
187 thrd[n] = xpthread_create (NULL, reader_thread, &rargs[n]);
190 /* Wait for all the threads. */
191 for (n = 0; n < NWRITERS; ++n)
192 xpthread_join (thwr[n]);
193 for (n = 0; n < NREADERS; ++n)
194 xpthread_join (thrd[n]);
202 do_test_clock (CLOCK_USE_TIMEDLOCK, "timed");
203 do_test_clock (CLOCK_REALTIME, "clock(realtime)");
204 do_test_clock (CLOCK_MONOTONIC, "clock(monotonic)");
210 #include <support/test-driver.c>