thread-stub.c revision 1.21 1 1.21 ad /* $NetBSD: thread-stub.c,v 1.21 2009/01/30 23:21:03 ad Exp $ */
2 1.2 thorpej
3 1.2 thorpej /*-
4 1.21 ad * Copyright (c) 2003, 2009 The NetBSD Foundation, Inc.
5 1.2 thorpej * All rights reserved.
6 1.2 thorpej *
7 1.2 thorpej * This code is derived from software contributed to The NetBSD Foundation
8 1.2 thorpej * by Jason R. Thorpe.
9 1.2 thorpej *
10 1.2 thorpej * Redistribution and use in source and binary forms, with or without
11 1.2 thorpej * modification, are permitted provided that the following conditions
12 1.2 thorpej * are met:
13 1.2 thorpej * 1. Redistributions of source code must retain the above copyright
14 1.2 thorpej * notice, this list of conditions and the following disclaimer.
15 1.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright
16 1.2 thorpej * notice, this list of conditions and the following disclaimer in the
17 1.2 thorpej * documentation and/or other materials provided with the distribution.
18 1.2 thorpej *
19 1.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.2 thorpej * POSSIBILITY OF SUCH DAMAGE.
30 1.2 thorpej */
31 1.2 thorpej
32 1.13 lukem #include <sys/cdefs.h>
33 1.13 lukem #if defined(LIBC_SCCS) && !defined(lint)
34 1.21 ad __RCSID("$NetBSD: thread-stub.c,v 1.21 2009/01/30 23:21:03 ad Exp $");
35 1.13 lukem #endif /* LIBC_SCCS and not lint */
36 1.13 lukem
37 1.2 thorpej /*
38 1.2 thorpej * Stubs for thread operations, for use when threads are not used by
39 1.2 thorpej * the application. See "reentrant.h" for details.
40 1.2 thorpej */
41 1.2 thorpej
42 1.2 thorpej #ifdef _REENTRANT
43 1.2 thorpej
44 1.2 thorpej #define __LIBC_THREAD_STUBS
45 1.2 thorpej
46 1.2 thorpej #include "namespace.h"
47 1.2 thorpej #include "reentrant.h"
48 1.2 thorpej
49 1.5 thorpej #include <errno.h>
50 1.2 thorpej #include <signal.h>
51 1.8 matt #include <stdlib.h>
52 1.2 thorpej #include <unistd.h>
53 1.2 thorpej
54 1.2 thorpej extern int __isthreaded;
55 1.2 thorpej
56 1.21 ad #define DIE() (void)raise(SIGABRT)
57 1.2 thorpej
58 1.2 thorpej #define CHECK_NOT_THREADED_ALWAYS() \
59 1.2 thorpej do { \
60 1.2 thorpej if (__isthreaded) \
61 1.2 thorpej DIE(); \
62 1.2 thorpej } while (/*CONSTCOND*/0)
63 1.2 thorpej
64 1.2 thorpej #if 1
65 1.2 thorpej #define CHECK_NOT_THREADED() CHECK_NOT_THREADED_ALWAYS()
66 1.2 thorpej #else
67 1.2 thorpej #define CHECK_NOT_THREADED() /* nothing */
68 1.2 thorpej #endif
69 1.2 thorpej
70 1.15 ad /* libpthread init */
71 1.15 ad
72 1.15 ad void __libc_thr_init(void);
73 1.15 ad void __libc_thr_init_stub(void);
74 1.15 ad
75 1.15 ad __weak_alias(__libc_thr_init,__libc_thr_init_stub)
76 1.15 ad
77 1.15 ad void
78 1.15 ad __libc_thr_init_stub(void)
79 1.15 ad {
80 1.15 ad
81 1.15 ad /* nothing, may be overridden by libpthread */
82 1.15 ad }
83 1.15 ad
84 1.2 thorpej /* mutexes */
85 1.2 thorpej
86 1.2 thorpej int __libc_mutex_init_stub(mutex_t *, const mutexattr_t *);
87 1.2 thorpej int __libc_mutex_catchall_stub(mutex_t *);
88 1.2 thorpej
89 1.2 thorpej __weak_alias(__libc_mutex_init,__libc_mutex_init_stub)
90 1.2 thorpej __weak_alias(__libc_mutex_lock,__libc_mutex_catchall_stub)
91 1.2 thorpej __weak_alias(__libc_mutex_trylock,__libc_mutex_catchall_stub)
92 1.2 thorpej __weak_alias(__libc_mutex_unlock,__libc_mutex_catchall_stub)
93 1.2 thorpej __weak_alias(__libc_mutex_destroy,__libc_mutex_catchall_stub)
94 1.2 thorpej
95 1.4 thorpej int __libc_mutexattr_catchall_stub(mutexattr_t *);
96 1.4 thorpej int __libc_mutexattr_settype_stub(mutexattr_t *, int);
97 1.4 thorpej
98 1.4 thorpej __weak_alias(__libc_mutexattr_init,__libc_mutexattr_catchall_stub)
99 1.4 thorpej __weak_alias(__libc_mutexattr_destroy,__libc_mutexattr_catchall_stub)
100 1.4 thorpej __weak_alias(__libc_mutexattr_settype,__libc_mutexattr_settype_stub)
101 1.4 thorpej
102 1.2 thorpej int
103 1.2 thorpej __libc_mutex_init_stub(mutex_t *m, const mutexattr_t *a)
104 1.2 thorpej {
105 1.2 thorpej /* LINTED deliberate lack of effect */
106 1.2 thorpej (void)m;
107 1.2 thorpej /* LINTED deliberate lack of effect */
108 1.2 thorpej (void)a;
109 1.2 thorpej
110 1.2 thorpej CHECK_NOT_THREADED();
111 1.2 thorpej
112 1.2 thorpej return (0);
113 1.2 thorpej }
114 1.2 thorpej
115 1.2 thorpej int
116 1.2 thorpej __libc_mutex_catchall_stub(mutex_t *m)
117 1.2 thorpej {
118 1.2 thorpej /* LINTED deliberate lack of effect */
119 1.2 thorpej (void)m;
120 1.2 thorpej
121 1.2 thorpej CHECK_NOT_THREADED();
122 1.2 thorpej
123 1.2 thorpej return (0);
124 1.2 thorpej }
125 1.2 thorpej
126 1.4 thorpej int
127 1.4 thorpej __libc_mutexattr_settype_stub(mutexattr_t *ma, int type)
128 1.4 thorpej {
129 1.4 thorpej /* LINTED deliberate lack of effect */
130 1.4 thorpej (void)ma;
131 1.4 thorpej /* LINTED deliberate lack of effect */
132 1.4 thorpej (void)type;
133 1.4 thorpej
134 1.4 thorpej return (0);
135 1.4 thorpej }
136 1.4 thorpej
137 1.4 thorpej int
138 1.4 thorpej __libc_mutexattr_catchall_stub(mutexattr_t *ma)
139 1.4 thorpej {
140 1.4 thorpej /* LINTED deliberate lack of effect */
141 1.4 thorpej (void)ma;
142 1.4 thorpej
143 1.4 thorpej CHECK_NOT_THREADED();
144 1.4 thorpej
145 1.4 thorpej return (0);
146 1.4 thorpej }
147 1.2 thorpej
148 1.2 thorpej /* condition variables */
149 1.2 thorpej
150 1.2 thorpej int __libc_cond_init_stub(cond_t *, const condattr_t *);
151 1.2 thorpej int __libc_cond_wait_stub(cond_t *, mutex_t *);
152 1.2 thorpej int __libc_cond_timedwait_stub(cond_t *, mutex_t *,
153 1.2 thorpej const struct timespec *);
154 1.2 thorpej int __libc_cond_catchall_stub(cond_t *);
155 1.2 thorpej
156 1.2 thorpej __weak_alias(__libc_cond_init,__libc_cond_init_stub)
157 1.2 thorpej __weak_alias(__libc_cond_signal,__libc_cond_catchall_stub)
158 1.2 thorpej __weak_alias(__libc_cond_broadcast,__libc_cond_catchall_stub)
159 1.2 thorpej __weak_alias(__libc_cond_wait,__libc_cond_wait_stub)
160 1.2 thorpej __weak_alias(__libc_cond_timedwait,__libc_cond_timedwait_stub)
161 1.2 thorpej __weak_alias(__libc_cond_destroy,__libc_cond_catchall_stub)
162 1.2 thorpej
163 1.2 thorpej int
164 1.2 thorpej __libc_cond_init_stub(cond_t *c, const condattr_t *a)
165 1.2 thorpej {
166 1.2 thorpej /* LINTED deliberate lack of effect */
167 1.2 thorpej (void)c;
168 1.2 thorpej /* LINTED deliberate lack of effect */
169 1.2 thorpej (void)a;
170 1.2 thorpej
171 1.2 thorpej CHECK_NOT_THREADED();
172 1.2 thorpej
173 1.2 thorpej return (0);
174 1.2 thorpej }
175 1.2 thorpej
176 1.2 thorpej int
177 1.2 thorpej __libc_cond_wait_stub(cond_t *c, mutex_t *m)
178 1.2 thorpej {
179 1.2 thorpej /* LINTED deliberate lack of effect */
180 1.2 thorpej (void)c;
181 1.2 thorpej /* LINTED deliberate lack of effect */
182 1.2 thorpej (void)m;
183 1.2 thorpej
184 1.2 thorpej CHECK_NOT_THREADED();
185 1.2 thorpej
186 1.2 thorpej return (0);
187 1.2 thorpej }
188 1.2 thorpej
189 1.2 thorpej int
190 1.2 thorpej __libc_cond_timedwait_stub(cond_t *c, mutex_t *m, const struct timespec *t)
191 1.2 thorpej {
192 1.2 thorpej /* LINTED deliberate lack of effect */
193 1.2 thorpej (void)c;
194 1.2 thorpej /* LINTED deliberate lack of effect */
195 1.2 thorpej (void)m;
196 1.2 thorpej /* LINTED deliberate lack of effect */
197 1.2 thorpej (void)t;
198 1.2 thorpej
199 1.2 thorpej CHECK_NOT_THREADED();
200 1.2 thorpej
201 1.2 thorpej return (0);
202 1.2 thorpej }
203 1.2 thorpej
204 1.2 thorpej int
205 1.2 thorpej __libc_cond_catchall_stub(cond_t *c)
206 1.2 thorpej {
207 1.2 thorpej /* LINTED deliberate lack of effect */
208 1.2 thorpej (void)c;
209 1.2 thorpej
210 1.2 thorpej CHECK_NOT_THREADED();
211 1.2 thorpej
212 1.2 thorpej return (0);
213 1.2 thorpej }
214 1.2 thorpej
215 1.2 thorpej
216 1.2 thorpej /* read-write locks */
217 1.2 thorpej
218 1.2 thorpej int __libc_rwlock_init_stub(rwlock_t *, rwlockattr_t *);
219 1.2 thorpej int __libc_rwlock_catchall_stub(rwlock_t *);
220 1.2 thorpej
221 1.2 thorpej __weak_alias(__libc_rwlock_init,__libc_rwlock_init_stub)
222 1.2 thorpej __weak_alias(__libc_rwlock_rdlock,__libc_rwlock_catchall_stub)
223 1.2 thorpej __weak_alias(__libc_rwlock_wrlock,__libc_rwlock_catchall_stub)
224 1.2 thorpej __weak_alias(__libc_rwlock_tryrdlock,__libc_rwlock_catchall_stub)
225 1.2 thorpej __weak_alias(__libc_rwlock_trywrlock,__libc_rwlock_catchall_stub)
226 1.2 thorpej __weak_alias(__libc_rwlock_unlock,__libc_rwlock_catchall_stub)
227 1.2 thorpej __weak_alias(__libc_rwlock_destroy,__libc_rwlock_catchall_stub)
228 1.2 thorpej
229 1.2 thorpej int
230 1.2 thorpej __libc_rwlock_init_stub(rwlock_t *l, rwlockattr_t *a)
231 1.2 thorpej {
232 1.2 thorpej /* LINTED deliberate lack of effect */
233 1.2 thorpej (void)l;
234 1.2 thorpej /* LINTED deliberate lack of effect */
235 1.2 thorpej (void)a;
236 1.2 thorpej
237 1.2 thorpej CHECK_NOT_THREADED();
238 1.2 thorpej
239 1.2 thorpej return (0);
240 1.2 thorpej }
241 1.2 thorpej
242 1.2 thorpej int
243 1.2 thorpej __libc_rwlock_catchall_stub(rwlock_t *l)
244 1.2 thorpej {
245 1.2 thorpej /* LINTED deliberate lack of effect */
246 1.2 thorpej (void)l;
247 1.2 thorpej
248 1.2 thorpej CHECK_NOT_THREADED();
249 1.2 thorpej
250 1.2 thorpej return (0);
251 1.2 thorpej }
252 1.2 thorpej
253 1.2 thorpej
254 1.7 thorpej /*
255 1.7 thorpej * thread-specific data; we need to actually provide a simple TSD
256 1.7 thorpej * implementation, since some thread-safe libraries want to use it.
257 1.7 thorpej */
258 1.7 thorpej
259 1.7 thorpej #define TSD_KEYS_MAX 64
260 1.7 thorpej
261 1.7 thorpej static struct {
262 1.7 thorpej void *tsd_val;
263 1.7 thorpej void (*tsd_dtor)(void *);
264 1.7 thorpej int tsd_inuse;
265 1.7 thorpej } __libc_tsd[TSD_KEYS_MAX];
266 1.7 thorpej static int __libc_tsd_nextkey;
267 1.2 thorpej
268 1.2 thorpej int __libc_thr_keycreate_stub(thread_key_t *, void (*)(void *));
269 1.2 thorpej int __libc_thr_setspecific_stub(thread_key_t, const void *);
270 1.2 thorpej void *__libc_thr_getspecific_stub(thread_key_t);
271 1.2 thorpej int __libc_thr_keydelete_stub(thread_key_t);
272 1.2 thorpej
273 1.2 thorpej __weak_alias(__libc_thr_keycreate,__libc_thr_keycreate_stub)
274 1.2 thorpej __weak_alias(__libc_thr_setspecific,__libc_thr_setspecific_stub)
275 1.2 thorpej __weak_alias(__libc_thr_getspecific,__libc_thr_getspecific_stub)
276 1.2 thorpej __weak_alias(__libc_thr_keydelete,__libc_thr_keydelete_stub)
277 1.2 thorpej
278 1.2 thorpej int
279 1.2 thorpej __libc_thr_keycreate_stub(thread_key_t *k, void (*d)(void *))
280 1.2 thorpej {
281 1.7 thorpej int i;
282 1.2 thorpej
283 1.7 thorpej for (i = __libc_tsd_nextkey; i < TSD_KEYS_MAX; i++) {
284 1.7 thorpej if (__libc_tsd[i].tsd_inuse == 0)
285 1.7 thorpej goto out;
286 1.7 thorpej }
287 1.7 thorpej
288 1.7 thorpej for (i = 0; i < __libc_tsd_nextkey; i++) {
289 1.7 thorpej if (__libc_tsd[i].tsd_inuse == 0)
290 1.7 thorpej goto out;
291 1.7 thorpej }
292 1.7 thorpej
293 1.7 thorpej return (EAGAIN);
294 1.7 thorpej
295 1.7 thorpej out:
296 1.7 thorpej /*
297 1.7 thorpej * XXX We don't actually do anything with the destructor. We
298 1.7 thorpej * XXX probably should.
299 1.7 thorpej */
300 1.7 thorpej __libc_tsd[i].tsd_inuse = 1;
301 1.7 thorpej __libc_tsd_nextkey = (i + i) % TSD_KEYS_MAX;
302 1.7 thorpej __libc_tsd[i].tsd_dtor = d;
303 1.7 thorpej *k = i;
304 1.2 thorpej
305 1.2 thorpej return (0);
306 1.2 thorpej }
307 1.2 thorpej
308 1.2 thorpej int
309 1.2 thorpej __libc_thr_setspecific_stub(thread_key_t k, const void *v)
310 1.2 thorpej {
311 1.2 thorpej
312 1.14 christos __libc_tsd[k].tsd_val = __UNCONST(v);
313 1.2 thorpej
314 1.2 thorpej return (0);
315 1.2 thorpej }
316 1.2 thorpej
317 1.2 thorpej void *
318 1.2 thorpej __libc_thr_getspecific_stub(thread_key_t k)
319 1.2 thorpej {
320 1.2 thorpej
321 1.7 thorpej return (__libc_tsd[k].tsd_val);
322 1.2 thorpej }
323 1.2 thorpej
324 1.2 thorpej int
325 1.2 thorpej __libc_thr_keydelete_stub(thread_key_t k)
326 1.2 thorpej {
327 1.2 thorpej
328 1.7 thorpej /*
329 1.7 thorpej * XXX Do not recycle key; see big comment in libpthread.
330 1.7 thorpej */
331 1.7 thorpej
332 1.7 thorpej __libc_tsd[k].tsd_dtor = NULL;
333 1.2 thorpej
334 1.2 thorpej return (0);
335 1.2 thorpej }
336 1.2 thorpej
337 1.2 thorpej
338 1.2 thorpej /* misc. */
339 1.2 thorpej
340 1.2 thorpej int __libc_thr_once_stub(once_t *, void (*)(void));
341 1.2 thorpej int __libc_thr_sigsetmask_stub(int, const sigset_t *, sigset_t *);
342 1.2 thorpej thr_t __libc_thr_self_stub(void);
343 1.12 nathanw int __libc_thr_yield_stub(void);
344 1.5 thorpej int __libc_thr_create_stub(thr_t *, const thrattr_t *,
345 1.5 thorpej void *(*)(void *), void *);
346 1.5 thorpej void __libc_thr_exit_stub(void *);
347 1.2 thorpej int *__libc_thr_errno_stub(void);
348 1.9 nathanw int __libc_thr_setcancelstate_stub(int, int *);
349 1.16 drochner int __libc_thr_equal_stub(pthread_t, pthread_t);
350 1.19 christos unsigned int __libc_thr_curcpu_stub(void);
351 1.2 thorpej
352 1.2 thorpej __weak_alias(__libc_thr_once,__libc_thr_once_stub)
353 1.2 thorpej __weak_alias(__libc_thr_sigsetmask,__libc_thr_sigsetmask_stub)
354 1.2 thorpej __weak_alias(__libc_thr_self,__libc_thr_self_stub)
355 1.5 thorpej __weak_alias(__libc_thr_yield,__libc_thr_yield_stub)
356 1.5 thorpej __weak_alias(__libc_thr_create,__libc_thr_create_stub)
357 1.5 thorpej __weak_alias(__libc_thr_exit,__libc_thr_exit_stub)
358 1.2 thorpej __weak_alias(__libc_thr_errno,__libc_thr_errno_stub)
359 1.9 nathanw __weak_alias(__libc_thr_setcancelstate,__libc_thr_setcancelstate_stub)
360 1.16 drochner __weak_alias(__libc_thr_equal,__libc_thr_equal_stub)
361 1.18 christos __weak_alias(__libc_thr_curcpu,__libc_thr_curcpu_stub)
362 1.2 thorpej
363 1.5 thorpej
364 1.2 thorpej int
365 1.2 thorpej __libc_thr_once_stub(once_t *o, void (*r)(void))
366 1.2 thorpej {
367 1.2 thorpej
368 1.3 thorpej /* XXX Knowledge of libpthread types. */
369 1.3 thorpej
370 1.3 thorpej if (o->pto_done == 0) {
371 1.3 thorpej (*r)();
372 1.3 thorpej o->pto_done = 1;
373 1.3 thorpej }
374 1.2 thorpej
375 1.2 thorpej return (0);
376 1.2 thorpej }
377 1.2 thorpej
378 1.2 thorpej int
379 1.2 thorpej __libc_thr_sigsetmask_stub(int h, const sigset_t *s, sigset_t *o)
380 1.2 thorpej {
381 1.2 thorpej
382 1.2 thorpej CHECK_NOT_THREADED();
383 1.2 thorpej
384 1.10 nathanw return sigprocmask(h, s, o);
385 1.2 thorpej }
386 1.2 thorpej
387 1.2 thorpej thr_t
388 1.2 thorpej __libc_thr_self_stub(void)
389 1.2 thorpej {
390 1.2 thorpej
391 1.6 thorpej return ((thr_t) -1);
392 1.5 thorpej }
393 1.5 thorpej
394 1.11 nathanw int
395 1.5 thorpej __libc_thr_yield_stub(void)
396 1.5 thorpej {
397 1.5 thorpej
398 1.5 thorpej /* Nothing to do. */
399 1.11 nathanw return (0);
400 1.5 thorpej }
401 1.5 thorpej
402 1.5 thorpej int
403 1.5 thorpej __libc_thr_create_stub(thr_t *tp, const thrattr_t *ta,
404 1.5 thorpej void *(*f)(void *), void *a)
405 1.5 thorpej {
406 1.5 thorpej /* LINTED deliberate lack of effect */
407 1.5 thorpej (void)tp;
408 1.5 thorpej /* LINTED deliberate lack of effect */
409 1.5 thorpej (void)ta;
410 1.5 thorpej /* LINTED deliberate lack of effect */
411 1.5 thorpej (void)f;
412 1.5 thorpej /* LINTED deliberate lack of effect */
413 1.5 thorpej (void)a;
414 1.5 thorpej
415 1.2 thorpej DIE();
416 1.2 thorpej
417 1.5 thorpej return (EOPNOTSUPP);
418 1.5 thorpej }
419 1.5 thorpej
420 1.5 thorpej void
421 1.5 thorpej __libc_thr_exit_stub(void *v)
422 1.5 thorpej {
423 1.5 thorpej /* LINTED deliberate lack of effect */
424 1.5 thorpej (void)v;
425 1.5 thorpej exit(0);
426 1.9 nathanw }
427 1.9 nathanw
428 1.9 nathanw int
429 1.9 nathanw __libc_thr_setcancelstate_stub(int new, int *old)
430 1.9 nathanw {
431 1.9 nathanw /* LINTED deliberate lack of effect */
432 1.9 nathanw (void)new;
433 1.9 nathanw
434 1.9 nathanw /* LINTED deliberate lack of effect */
435 1.9 nathanw (void)old;
436 1.9 nathanw
437 1.9 nathanw CHECK_NOT_THREADED();
438 1.9 nathanw
439 1.9 nathanw return (0);
440 1.2 thorpej }
441 1.2 thorpej
442 1.16 drochner int
443 1.16 drochner __libc_thr_equal_stub(pthread_t t1, pthread_t t2)
444 1.16 drochner {
445 1.16 drochner
446 1.16 drochner /* assert that t1=t2=pthread_self() */
447 1.16 drochner return (t1 == t2);
448 1.16 drochner }
449 1.16 drochner
450 1.2 thorpej int *
451 1.2 thorpej __libc_thr_errno_stub(void)
452 1.2 thorpej {
453 1.2 thorpej
454 1.2 thorpej DIE();
455 1.2 thorpej
456 1.2 thorpej return (NULL);
457 1.2 thorpej }
458 1.2 thorpej
459 1.17 ad unsigned int
460 1.18 christos __libc_thr_curcpu_stub(void)
461 1.17 ad {
462 1.17 ad
463 1.17 ad return (0);
464 1.17 ad }
465 1.17 ad
466 1.2 thorpej #endif /* _REENTRANT */
467