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33574c17 | 1 | /* Libc stubs for pthread functions. Hurd pthread version. |
04277e02 | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
33574c17 ST |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
33574c17 ST |
18 | |
19 | #include <errno.h> | |
20 | #include <dlfcn.h> | |
21 | #include <stdlib.h> | |
22 | #include <shlib-compat.h> | |
23 | #include <pthread-functions.h> | |
24 | #include <libc-lock.h> | |
25 | #include <fork.h> | |
26 | ||
27 | /* Pointers to the libc functions. */ | |
28 | struct pthread_functions __libc_pthread_functions attribute_hidden; | |
29 | int __libc_pthread_functions_init attribute_hidden; | |
30 | ||
31 | ||
32 | #define FORWARD2(name, rettype, decl, params, defaction) \ | |
33 | rettype \ | |
34 | name decl \ | |
35 | { \ | |
36 | if (!__libc_pthread_functions_init) \ | |
37 | defaction; \ | |
38 | \ | |
39 | return PTHFCT_CALL (ptr_##name, params); \ | |
40 | } | |
41 | ||
42 | /* Same as FORWARD2, only without return. */ | |
43 | #define FORWARD_NORETURN(name, rettype, decl, params, defaction) \ | |
44 | rettype \ | |
45 | name decl \ | |
46 | { \ | |
47 | if (!__libc_pthread_functions_init) \ | |
48 | defaction; \ | |
49 | \ | |
50 | PTHFCT_CALL (ptr_##name, params); \ | |
51 | } | |
52 | ||
53 | #define FORWARD(name, decl, params, defretval) \ | |
54 | FORWARD2 (name, int, decl, params, return defretval) | |
55 | ||
56 | FORWARD (pthread_attr_destroy, (pthread_attr_t *attr), (attr), 0) | |
57 | ||
58 | FORWARD (pthread_attr_init, (pthread_attr_t *attr), (attr), 0) | |
59 | ||
60 | FORWARD (pthread_attr_getdetachstate, | |
61 | (const pthread_attr_t *attr, int *detachstate), (attr, detachstate), | |
62 | 0) | |
63 | FORWARD (pthread_attr_setdetachstate, (pthread_attr_t *attr, int detachstate), | |
64 | (attr, detachstate), 0) | |
65 | ||
66 | FORWARD (pthread_attr_getinheritsched, | |
67 | (const pthread_attr_t *attr, int *inherit), (attr, inherit), 0) | |
68 | FORWARD (pthread_attr_setinheritsched, (pthread_attr_t *attr, int inherit), | |
69 | (attr, inherit), 0) | |
70 | ||
71 | FORWARD (pthread_attr_getschedparam, | |
72 | (const pthread_attr_t *attr, struct sched_param *param), | |
73 | (attr, param), 0) | |
74 | FORWARD (pthread_attr_setschedparam, | |
75 | (pthread_attr_t *attr, const struct sched_param *param), | |
76 | (attr, param), 0) | |
77 | ||
78 | FORWARD (pthread_attr_getschedpolicy, | |
79 | (const pthread_attr_t *attr, int *policy), (attr, policy), 0) | |
80 | FORWARD (pthread_attr_setschedpolicy, (pthread_attr_t *attr, int policy), | |
81 | (attr, policy), 0) | |
82 | ||
83 | FORWARD (pthread_attr_getscope, | |
84 | (const pthread_attr_t *attr, int *scope), (attr, scope), 0) | |
85 | FORWARD (pthread_attr_setscope, (pthread_attr_t *attr, int scope), | |
86 | (attr, scope), 0) | |
87 | ||
88 | ||
89 | FORWARD (pthread_condattr_destroy, (pthread_condattr_t *attr), (attr), 0) | |
90 | FORWARD (pthread_condattr_init, (pthread_condattr_t *attr), (attr), 0) | |
91 | ||
92 | ||
93 | FORWARD (pthread_cond_broadcast, (pthread_cond_t *cond), (cond), 0) | |
94 | FORWARD (pthread_cond_destroy, (pthread_cond_t *cond), (cond), 0) | |
95 | FORWARD (pthread_cond_init, | |
96 | (pthread_cond_t *cond, const pthread_condattr_t *cond_attr), | |
97 | (cond, cond_attr), 0) | |
98 | FORWARD (pthread_cond_signal, (pthread_cond_t *cond), (cond), 0) | |
99 | FORWARD (pthread_cond_wait, (pthread_cond_t *cond, pthread_mutex_t *mutex), | |
100 | (cond, mutex), 0) | |
101 | FORWARD (pthread_cond_timedwait, | |
102 | (pthread_cond_t *cond, pthread_mutex_t *mutex, | |
103 | const struct timespec *abstime), (cond, mutex, abstime), 0) | |
104 | ||
105 | FORWARD (pthread_equal, (pthread_t thread1, pthread_t thread2), | |
106 | (thread1, thread2), 1) | |
107 | ||
108 | ||
109 | /* Use an alias to avoid warning, as pthread_exit is declared noreturn. */ | |
110 | FORWARD_NORETURN (__pthread_exit, void, (void *retval), (retval), | |
111 | exit (EXIT_SUCCESS)) | |
112 | strong_alias (__pthread_exit, pthread_exit); | |
113 | ||
114 | ||
115 | FORWARD (pthread_getschedparam, | |
116 | (pthread_t target_thread, int *policy, struct sched_param *param), | |
117 | (target_thread, policy, param), 0) | |
118 | FORWARD (pthread_setschedparam, | |
119 | (pthread_t target_thread, int policy, | |
120 | const struct sched_param *param), (target_thread, policy, param), 0) | |
121 | ||
122 | ||
123 | FORWARD (pthread_mutex_destroy, (pthread_mutex_t *mutex), (mutex), 0) | |
124 | ||
125 | FORWARD (pthread_mutex_init, | |
126 | (pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr), | |
127 | (mutex, mutexattr), 0) | |
128 | ||
129 | FORWARD (pthread_mutex_lock, (pthread_mutex_t *mutex), (mutex), 0) | |
130 | ||
131 | FORWARD (pthread_mutex_unlock, (pthread_mutex_t *mutex), (mutex), 0) | |
132 | ||
133 | ||
134 | FORWARD2 (pthread_self, pthread_t, (void), (), return 0) | |
135 | ||
136 | ||
137 | FORWARD (__pthread_setcancelstate, (int state, int *oldstate), | |
138 | (state, oldstate), 0) | |
139 | strong_alias (__pthread_setcancelstate, pthread_setcancelstate); | |
140 | ||
141 | FORWARD (pthread_setcanceltype, (int type, int *oldtype), (type, oldtype), 0) | |
142 | ||
143 | struct __pthread_cancelation_handler *dummy_list; | |
144 | FORWARD2 (__pthread_get_cleanup_stack, struct __pthread_cancelation_handler **, | |
145 | (void), (), return &dummy_list); | |
146 | ||
147 | \f | |
148 | /* Fork interaction */ | |
149 | ||
150 | struct atfork | |
151 | { | |
152 | void (*prepare) (void); | |
153 | void (*parent) (void); | |
154 | void (*child) (void); | |
155 | void *dso_handle; | |
156 | struct atfork *prev; | |
157 | struct atfork *next; | |
158 | }; | |
159 | ||
160 | /* TODO: better locking */ | |
161 | __libc_lock_define_initialized (static, atfork_lock); | |
162 | static struct atfork *fork_handlers, *fork_last_handler; | |
163 | ||
164 | static void | |
165 | atfork_pthread_prepare (void) | |
166 | { | |
167 | struct atfork *handlers, *last_handler; | |
168 | ||
169 | __libc_lock_lock (atfork_lock); | |
170 | handlers = fork_handlers; | |
171 | last_handler = fork_last_handler; | |
172 | __libc_lock_unlock (atfork_lock); | |
173 | ||
174 | if (last_handler == NULL) | |
175 | return; | |
176 | ||
177 | while (1) | |
178 | { | |
179 | if (last_handler->prepare != NULL) | |
180 | last_handler->prepare (); | |
181 | if (last_handler == handlers) | |
182 | break; | |
183 | last_handler = last_handler->prev; | |
184 | } | |
185 | } | |
186 | text_set_element (_hurd_atfork_prepare_hook, atfork_pthread_prepare); | |
187 | ||
188 | static void | |
189 | atfork_pthread_parent (void) | |
190 | { | |
191 | struct atfork *handlers; | |
192 | ||
193 | __libc_lock_lock (atfork_lock); | |
194 | handlers = fork_handlers; | |
195 | __libc_lock_unlock (atfork_lock); | |
196 | ||
197 | while (handlers != NULL) | |
198 | { | |
199 | if (handlers->parent != NULL) | |
200 | handlers->parent (); | |
201 | handlers = handlers->next; | |
202 | } | |
203 | } | |
204 | text_set_element (_hurd_atfork_parent_hook, atfork_pthread_parent); | |
205 | ||
206 | static void | |
207 | atfork_pthread_child (void) | |
208 | { | |
209 | struct atfork *handlers; | |
210 | ||
211 | __libc_lock_lock (atfork_lock); | |
212 | handlers = fork_handlers; | |
213 | __libc_lock_unlock (atfork_lock); | |
214 | ||
215 | while (handlers != NULL) | |
216 | { | |
217 | if (handlers->child != NULL) | |
218 | handlers->child (); | |
219 | handlers = handlers->next; | |
220 | } | |
221 | } | |
222 | text_set_element (_hurd_atfork_child_hook, atfork_pthread_child); | |
223 | ||
224 | int | |
225 | __register_atfork (void (*prepare) (void), | |
226 | void (*parent) (void), | |
227 | void (*child) (void), | |
228 | void *dso_handle) | |
229 | { | |
230 | struct atfork *new = malloc (sizeof (*new)); | |
231 | if (new == NULL) | |
232 | return errno; | |
233 | ||
234 | new->prepare = prepare; | |
235 | new->parent = parent; | |
236 | new->child = child; | |
237 | new->dso_handle = dso_handle; | |
238 | new->prev = NULL; | |
239 | ||
240 | __libc_lock_lock (atfork_lock); | |
241 | new->next = fork_handlers; | |
242 | if (fork_handlers != NULL) | |
243 | fork_handlers->prev = new; | |
244 | fork_handlers = new; | |
245 | if (fork_last_handler == NULL) | |
246 | fork_last_handler = new; | |
247 | __libc_lock_unlock (atfork_lock); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | libc_hidden_def (__register_atfork) | |
252 | ||
253 | void | |
254 | __unregister_atfork (void *dso_handle) | |
255 | { | |
256 | struct atfork **handlers, *prev = NULL, *next; | |
257 | __libc_lock_lock (atfork_lock); | |
258 | handlers = &fork_handlers; | |
259 | while (*handlers != NULL) | |
260 | { | |
261 | if ((*handlers)->dso_handle == dso_handle) | |
262 | { | |
263 | /* Drop this handler from the list. */ | |
264 | if (*handlers == fork_last_handler) | |
265 | { | |
266 | /* Was last, new last is prev, if any. */ | |
267 | fork_last_handler = prev; | |
268 | } | |
269 | ||
270 | next = (*handlers)->next; | |
271 | if (next != NULL) | |
272 | next->prev = prev; | |
273 | *handlers = next; | |
274 | } | |
275 | else | |
276 | { | |
277 | /* Just proceed to next handler. */ | |
278 | prev = *handlers; | |
279 | handlers = &prev->next; | |
280 | } | |
281 | } | |
282 | __libc_lock_unlock (atfork_lock); | |
283 | } |