1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/* Test program for timedout read/write lock functions.
Copyright (C) 2000-2025 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/timespec.h>
#include <support/xthread.h>
#define NWRITERS 15
#define WRITETRIES 10
#define NREADERS 15
#define READTRIES 15
static const struct timespec timeout = { 0,1000000 };
static const struct timespec delay = { 0, 1000000 };
#ifndef KIND
# define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
#endif
/* A bogus clock value that tells the tests to use pthread_rwlock_timedrdlock
and pthread_rwlock_timedwrlock rather than pthread_rwlock_clockrdlock and
pthread_rwlock_clockwrlock. */
#define CLOCK_USE_TIMEDLOCK (-1)
static pthread_rwlock_t lock;
struct thread_args
{
int nr;
clockid_t clockid;
const char *fnname;
};
static void *
writer_thread (void *arg)
{
struct thread_args *args = arg;
const int nr = args->nr;
const clockid_t clockid = args->clockid;
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
const char *fnname = args->fnname;
struct timespec ts;
int n;
for (n = 0; n < WRITETRIES; ++n)
{
int e;
do
{
xclock_gettime (clockid_for_get, &ts);
ts = timespec_add (ts, timeout);
ts = timespec_add (ts, timeout);
printf ("writer thread %d tries again\n", nr);
e = (clockid == CLOCK_USE_TIMEDLOCK)
? pthread_rwlock_timedwrlock (&lock, &ts)
: pthread_rwlock_clockwrlock (&lock, clockid, &ts);
if (e != 0 && e != ETIMEDOUT)
FAIL_EXIT1 ("%swrlock failed", fnname);
}
while (e == ETIMEDOUT);
printf ("writer thread %d succeeded\n", nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
FAIL_EXIT1 ("unlock for writer failed");
printf ("writer thread %d released\n", nr);
}
return NULL;
}
static void *
reader_thread (void *arg)
{
struct thread_args *args = arg;
const int nr = args->nr;
const clockid_t clockid = args->clockid;
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
const char *fnname = args->fnname;
struct timespec ts;
int n;
for (n = 0; n < READTRIES; ++n)
{
int e;
do
{
xclock_gettime (clockid_for_get, &ts);
ts = timespec_add (ts, timeout);
printf ("reader thread %d tries again\n", nr);
if (clockid == CLOCK_USE_TIMEDLOCK)
e = pthread_rwlock_timedrdlock (&lock, &ts);
else
e = pthread_rwlock_clockrdlock (&lock, clockid, &ts);
if (e != 0 && e != ETIMEDOUT)
FAIL_EXIT1 ("%srdlock failed", fnname);
}
while (e == ETIMEDOUT);
printf ("reader thread %d succeeded\n", nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
FAIL_EXIT1 ("unlock for reader failed");
printf ("reader thread %d released\n", nr);
}
return NULL;
}
static int
do_test_clock (clockid_t clockid, const char *fnname)
{
pthread_t thwr[NWRITERS];
pthread_t thrd[NREADERS];
int n;
pthread_rwlockattr_t a;
if (pthread_rwlockattr_init (&a) != 0)
FAIL_EXIT1 ("rwlockattr_t failed");
if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)
FAIL_EXIT1 ("rwlockattr_setkind failed");
if (pthread_rwlock_init (&lock, &a) != 0)
FAIL_EXIT1 ("rwlock_init failed");
/* Make standard error the same as standard output. */
dup2 (1, 2);
/* Make sure we see all message, even those on stdout. */
setvbuf (stdout, NULL, _IONBF, 0);
struct thread_args wargs[NWRITERS];
for (n = 0; n < NWRITERS; ++n) {
wargs[n].nr = n;
wargs[n].clockid = clockid;
wargs[n].fnname = fnname;
thwr[n] = xpthread_create (NULL, writer_thread, &wargs[n]);
}
struct thread_args rargs[NREADERS];
for (n = 0; n < NREADERS; ++n) {
rargs[n].nr = n;
rargs[n].clockid = clockid;
rargs[n].fnname = fnname;
thrd[n] = xpthread_create (NULL, reader_thread, &rargs[n]);
}
/* Wait for all the threads. */
for (n = 0; n < NWRITERS; ++n)
xpthread_join (thwr[n]);
for (n = 0; n < NREADERS; ++n)
xpthread_join (thrd[n]);
return 0;
}
static int
do_test (void)
{
do_test_clock (CLOCK_USE_TIMEDLOCK, "timed");
do_test_clock (CLOCK_REALTIME, "clock(realtime)");
do_test_clock (CLOCK_MONOTONIC, "clock(monotonic)");
return 0;
}
#define TIMEOUT 30
#include <support/test-driver.c>
|
