1 | /* Copyright (C) 2002-2024 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 (template: tmpfname); |
49 | if (fd == -1) |
50 | { |
51 | printf (format: "cannot open temporary file: %m\n" ); |
52 | return 1; |
53 | } |
54 | |
55 | /* Make sure it is always removed. */ |
56 | unlink (name: 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 (s: "short write" ); |
65 | return 1; |
66 | } |
67 | |
68 | mem = mmap (NULL, len: ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd: fd, offset: 0); |
69 | if (mem == MAP_FAILED) |
70 | { |
71 | printf (format: "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 (attr: &ma) != 0) |
88 | { |
89 | puts (s: "mutexattr_init failed" ); |
90 | return 1; |
91 | } |
92 | |
93 | if (pthread_mutexattr_getpshared (attr: &ma, pshared: &p) != 0) |
94 | { |
95 | puts (s: "1st mutexattr_getpshared failed" ); |
96 | return 1; |
97 | } |
98 | |
99 | if (p != PTHREAD_PROCESS_PRIVATE) |
100 | { |
101 | puts (s: "default pshared value wrong" ); |
102 | return 1; |
103 | } |
104 | |
105 | if (pthread_mutexattr_setpshared (attr: &ma, PTHREAD_PROCESS_SHARED) != 0) |
106 | { |
107 | puts (s: "mutexattr_setpshared failed" ); |
108 | return 1; |
109 | } |
110 | |
111 | if (pthread_mutexattr_getpshared (attr: &ma, pshared: &p) != 0) |
112 | { |
113 | puts (s: "2nd mutexattr_getpshared failed" ); |
114 | return 1; |
115 | } |
116 | |
117 | if (p != PTHREAD_PROCESS_SHARED) |
118 | { |
119 | puts (s: "pshared value after setpshared call wrong" ); |
120 | return 1; |
121 | } |
122 | |
123 | if (pthread_mutex_init (mutex: mut1, mutexattr: &ma) != 0) |
124 | { |
125 | puts (s: "1st mutex_init failed" ); |
126 | return 1; |
127 | } |
128 | |
129 | if (pthread_mutex_init (mutex: mut2, mutexattr: &ma) != 0) |
130 | { |
131 | puts (s: "2nd mutex_init failed" ); |
132 | return 1; |
133 | } |
134 | |
135 | if (pthread_condattr_init (attr: &ca) != 0) |
136 | { |
137 | puts (s: "condattr_init failed" ); |
138 | return 1; |
139 | } |
140 | |
141 | if (pthread_condattr_getpshared (attr: &ca, pshared: &p) != 0) |
142 | { |
143 | puts (s: "1st condattr_getpshared failed" ); |
144 | return 1; |
145 | } |
146 | |
147 | if (p != PTHREAD_PROCESS_PRIVATE) |
148 | { |
149 | puts (s: "default value for pshared in condattr wrong" ); |
150 | return 1; |
151 | } |
152 | |
153 | if (pthread_condattr_setpshared (attr: &ca, PTHREAD_PROCESS_SHARED) != 0) |
154 | { |
155 | puts (s: "condattr_setpshared failed" ); |
156 | return 1; |
157 | } |
158 | |
159 | if (pthread_condattr_getpshared (attr: &ca, pshared: &p) != 0) |
160 | { |
161 | puts (s: "2nd condattr_getpshared failed" ); |
162 | return 1; |
163 | } |
164 | |
165 | if (p != PTHREAD_PROCESS_SHARED) |
166 | { |
167 | puts (s: "pshared condattr still not set" ); |
168 | return 1; |
169 | } |
170 | |
171 | if (pthread_cond_init (cond: cond, cond_attr: &ca) != 0) |
172 | { |
173 | puts (s: "cond_init failed" ); |
174 | return 1; |
175 | } |
176 | |
177 | if (pthread_mutex_lock (mutex: mut1) != 0) |
178 | { |
179 | puts (s: "parent: 1st mutex_lock failed" ); |
180 | return 1; |
181 | } |
182 | |
183 | puts (s: "going to fork now" ); |
184 | pid = fork (); |
185 | if (pid == -1) |
186 | { |
187 | puts (s: "fork failed" ); |
188 | return 1; |
189 | } |
190 | else if (pid == 0) |
191 | { |
192 | if (pthread_mutex_lock (mutex: mut2) != 0) |
193 | { |
194 | puts (s: "child: mutex_lock failed" ); |
195 | return 1; |
196 | } |
197 | |
198 | if (pthread_mutex_unlock (mutex: mut1) != 0) |
199 | { |
200 | puts (s: "child: 1st mutex_unlock failed" ); |
201 | return 1; |
202 | } |
203 | |
204 | do |
205 | if (pthread_cond_wait (cond: cond, mutex: mut2) != 0) |
206 | { |
207 | puts (s: "child: cond_wait failed" ); |
208 | return 1; |
209 | } |
210 | while (*condition == 0); |
211 | |
212 | if (pthread_mutex_unlock (mutex: mut2) != 0) |
213 | { |
214 | puts (s: "child: 2nd mutex_unlock failed" ); |
215 | return 1; |
216 | } |
217 | |
218 | puts (s: "child done" ); |
219 | } |
220 | else |
221 | { |
222 | int status; |
223 | |
224 | if (pthread_mutex_lock (mutex: mut1) != 0) |
225 | { |
226 | puts (s: "parent: 2nd mutex_lock failed" ); |
227 | return 1; |
228 | } |
229 | |
230 | if (pthread_mutex_lock (mutex: mut2) != 0) |
231 | { |
232 | puts (s: "parent: 3rd mutex_lock failed" ); |
233 | return 1; |
234 | } |
235 | |
236 | if (pthread_cond_signal (cond: cond) != 0) |
237 | { |
238 | puts (s: "parent: cond_signal failed" ); |
239 | return 1; |
240 | } |
241 | |
242 | *condition = 1; |
243 | |
244 | if (pthread_mutex_unlock (mutex: mut2) != 0) |
245 | { |
246 | puts (s: "parent: mutex_unlock failed" ); |
247 | return 1; |
248 | } |
249 | |
250 | puts (s: "waiting for child" ); |
251 | |
252 | waitpid (pid: pid, stat_loc: &status, options: 0); |
253 | result |= status; |
254 | |
255 | puts (s: "parent done" ); |
256 | } |
257 | |
258 | return result; |
259 | } |
260 | |
261 | #define TEST_FUNCTION do_test () |
262 | #include "../test-skeleton.c" |
263 | |