1 /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
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
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
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.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <pthread.h>
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <sys/mman.h>
26 #include <sys/wait.h>
27
28
29 int *condition;
30
31 static int
32 do_test (void)
33 {
34 size_t ps = sysconf (_SC_PAGESIZE);
35 char tmpfname[] = "/tmp/tst-cond4.XXXXXX";
36 char data[ps];
37 void *mem;
38 int fd;
39 pthread_mutexattr_t ma;
40 pthread_mutex_t *mut1;
41 pthread_mutex_t *mut2;
42 pthread_condattr_t ca;
43 pthread_cond_t *cond;
44 pid_t pid;
45 int result = 0;
46 int p;
47
48 fd = mkstemp (tmpfname);
49 if (fd == -1)
50 {
51 printf ("cannot open temporary file: %m\n");
52 return 1;
53 }
54
55 /* Make sure it is always removed. */
56 unlink (tmpfname);
57
58 /* Create one page of data. */
59 memset (data, '\0', ps);
60
61 /* Write the data to the file. */
62 if (write (fd, data, ps) != (ssize_t) ps)
63 {
64 puts ("short write");
65 return 1;
66 }
67
68 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
69 if (mem == MAP_FAILED)
70 {
71 printf ("mmap failed: %m\n");
72 return 1;
73 }
74
75 mut1 = (pthread_mutex_t *) (((uintptr_t) mem
76 + __alignof (pthread_mutex_t))
77 & ~(__alignof (pthread_mutex_t) - 1));
78 mut2 = mut1 + 1;
79
80 cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
81 + __alignof (pthread_cond_t))
82 & ~(__alignof (pthread_cond_t) - 1));
83
84 condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
85 & ~(__alignof (int) - 1));
86
87 if (pthread_mutexattr_init (&ma) != 0)
88 {
89 puts ("mutexattr_init failed");
90 return 1;
91 }
92
93 if (pthread_mutexattr_getpshared (&ma, &p) != 0)
94 {
95 puts ("1st mutexattr_getpshared failed");
96 return 1;
97 }
98
99 if (p != PTHREAD_PROCESS_PRIVATE)
100 {
101 puts ("default pshared value wrong");
102 return 1;
103 }
104
105 if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
106 {
107 puts ("mutexattr_setpshared failed");
108 return 1;
109 }
110
111 if (pthread_mutexattr_getpshared (&ma, &p) != 0)
112 {
113 puts ("2nd mutexattr_getpshared failed");
114 return 1;
115 }
116
117 if (p != PTHREAD_PROCESS_SHARED)
118 {
119 puts ("pshared value after setpshared call wrong");
120 return 1;
121 }
122
123 if (pthread_mutex_init (mut1, &ma) != 0)
124 {
125 puts ("1st mutex_init failed");
126 return 1;
127 }
128
129 if (pthread_mutex_init (mut2, &ma) != 0)
130 {
131 puts ("2nd mutex_init failed");
132 return 1;
133 }
134
135 if (pthread_condattr_init (&ca) != 0)
136 {
137 puts ("condattr_init failed");
138 return 1;
139 }
140
141 if (pthread_condattr_getpshared (&ca, &p) != 0)
142 {
143 puts ("1st condattr_getpshared failed");
144 return 1;
145 }
146
147 if (p != PTHREAD_PROCESS_PRIVATE)
148 {
149 puts ("default value for pshared in condattr wrong");
150 return 1;
151 }
152
153 if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
154 {
155 puts ("condattr_setpshared failed");
156 return 1;
157 }
158
159 if (pthread_condattr_getpshared (&ca, &p) != 0)
160 {
161 puts ("2nd condattr_getpshared failed");
162 return 1;
163 }
164
165 if (p != PTHREAD_PROCESS_SHARED)
166 {
167 puts ("pshared condattr still not set");
168 return 1;
169 }
170
171 if (pthread_cond_init (cond, &ca) != 0)
172 {
173 puts ("cond_init failed");
174 return 1;
175 }
176
177 if (pthread_mutex_lock (mut1) != 0)
178 {
179 puts ("parent: 1st mutex_lock failed");
180 return 1;
181 }
182
183 puts ("going to fork now");
184 pid = fork ();
185 if (pid == -1)
186 {
187 puts ("fork failed");
188 return 1;
189 }
190 else if (pid == 0)
191 {
192 if (pthread_mutex_lock (mut2) != 0)
193 {
194 puts ("child: mutex_lock failed");
195 return 1;
196 }
197
198 if (pthread_mutex_unlock (mut1) != 0)
199 {
200 puts ("child: 1st mutex_unlock failed");
201 return 1;
202 }
203
204 do
205 if (pthread_cond_wait (cond, mut2) != 0)
206 {
207 puts ("child: cond_wait failed");
208 return 1;
209 }
210 while (*condition == 0);
211
212 if (pthread_mutex_unlock (mut2) != 0)
213 {
214 puts ("child: 2nd mutex_unlock failed");
215 return 1;
216 }
217
218 puts ("child done");
219 }
220 else
221 {
222 int status;
223
224 if (pthread_mutex_lock (mut1) != 0)
225 {
226 puts ("parent: 2nd mutex_lock failed");
227 return 1;
228 }
229
230 if (pthread_mutex_lock (mut2) != 0)
231 {
232 puts ("parent: 3rd mutex_lock failed");
233 return 1;
234 }
235
236 if (pthread_cond_signal (cond) != 0)
237 {
238 puts ("parent: cond_signal failed");
239 return 1;
240 }
241
242 *condition = 1;
243
244 if (pthread_mutex_unlock (mut2) != 0)
245 {
246 puts ("parent: mutex_unlock failed");
247 return 1;
248 }
249
250 puts ("waiting for child");
251
252 waitpid (pid, &status, 0);
253 result |= status;
254
255 puts ("parent done");
256 }
257
258 return result;
259 }
260
261 #define TEST_FUNCTION do_test ()
262 #include "../test-skeleton.c"