thread-stub.c revision 1.26
1 /* $NetBSD: thread-stub.c,v 1.26 2013/04/27 20:36:47 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: thread-stub.c,v 1.26 2013/04/27 20:36:47 joerg Exp $"); 35 #endif /* LIBC_SCCS and not lint */ 36 37 /* 38 * Stubs for thread operations, for use when threads are not used by 39 * the application. See "reentrant.h" for details. 40 */ 41 42 #ifdef _REENTRANT 43 44 #define __LIBC_THREAD_STUBS 45 46 #define pthread_join __libc_pthread_join 47 #define pthread_detach __libc_pthread_detach 48 #include "namespace.h" 49 #include "reentrant.h" 50 51 #include <errno.h> 52 #include <signal.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 extern int __isthreaded; 57 58 #define DIE() (void)raise(SIGABRT) 59 60 #define CHECK_NOT_THREADED_ALWAYS() \ 61 do { \ 62 if (__isthreaded) \ 63 DIE(); \ 64 } while (/*CONSTCOND*/0) 65 66 #if 1 67 #define CHECK_NOT_THREADED() CHECK_NOT_THREADED_ALWAYS() 68 #else 69 #define CHECK_NOT_THREADED() /* nothing */ 70 #endif 71 72 __weak_alias(pthread_join, __libc_pthread_join) 73 __weak_alias(pthread_detach, __libc_pthread_detach) 74 75 int 76 pthread_join(pthread_t thread, void **valptr) 77 { 78 79 if (thread == pthread_self()) 80 return EDEADLK; 81 return ESRCH; 82 } 83 84 int 85 pthread_detach(pthread_t thread) 86 { 87 88 if (thread == pthread_self()) 89 return 0; 90 return ESRCH; 91 } 92 93 /* mutexes */ 94 95 int __libc_mutex_catchall_stub(mutex_t *); 96 97 __weak_alias(__libc_mutex_init,__libc_mutex_init_stub) 98 __weak_alias(__libc_mutex_lock,__libc_mutex_catchall_stub) 99 __weak_alias(__libc_mutex_trylock,__libc_mutex_catchall_stub) 100 __weak_alias(__libc_mutex_unlock,__libc_mutex_catchall_stub) 101 __weak_alias(__libc_mutex_destroy,__libc_mutex_catchall_stub) 102 103 __strong_alias(__libc_mutex_lock_stub,__libc_mutex_catchall_stub) 104 __strong_alias(__libc_mutex_trylock_stub,__libc_mutex_catchall_stub) 105 __strong_alias(__libc_mutex_unlock_stub,__libc_mutex_catchall_stub) 106 __strong_alias(__libc_mutex_destroy_stub,__libc_mutex_catchall_stub) 107 108 int __libc_mutexattr_catchall_stub(mutexattr_t *); 109 110 __weak_alias(__libc_mutexattr_init,__libc_mutexattr_catchall_stub) 111 __weak_alias(__libc_mutexattr_destroy,__libc_mutexattr_catchall_stub) 112 __weak_alias(__libc_mutexattr_settype,__libc_mutexattr_settype_stub) 113 114 __strong_alias(__libc_mutexattr_init_stub,__libc_mutexattr_catchall_stub) 115 __strong_alias(__libc_mutexattr_destroy_stub,__libc_mutexattr_catchall_stub) 116 117 int 118 __libc_mutex_init_stub(mutex_t *m, const mutexattr_t *a) 119 { 120 /* LINTED deliberate lack of effect */ 121 (void)m; 122 /* LINTED deliberate lack of effect */ 123 (void)a; 124 125 CHECK_NOT_THREADED(); 126 127 return (0); 128 } 129 130 int 131 __libc_mutex_catchall_stub(mutex_t *m) 132 { 133 /* LINTED deliberate lack of effect */ 134 (void)m; 135 136 CHECK_NOT_THREADED(); 137 138 return (0); 139 } 140 141 int 142 __libc_mutexattr_settype_stub(mutexattr_t *ma, int type) 143 { 144 /* LINTED deliberate lack of effect */ 145 (void)ma; 146 /* LINTED deliberate lack of effect */ 147 (void)type; 148 149 return (0); 150 } 151 152 int 153 __libc_mutexattr_catchall_stub(mutexattr_t *ma) 154 { 155 /* LINTED deliberate lack of effect */ 156 (void)ma; 157 158 CHECK_NOT_THREADED(); 159 160 return (0); 161 } 162 163 /* condition variables */ 164 165 int __libc_cond_catchall_stub(cond_t *); 166 167 __weak_alias(__libc_cond_init,__libc_cond_init_stub) 168 __weak_alias(__libc_cond_signal,__libc_cond_catchall_stub) 169 __weak_alias(__libc_cond_broadcast,__libc_cond_catchall_stub) 170 __weak_alias(__libc_cond_wait,__libc_cond_catchall_stub) 171 __weak_alias(__libc_cond_timedwait,__libc_cond_timedwait_stub) 172 __weak_alias(__libc_cond_destroy,__libc_cond_catchall_stub) 173 174 __strong_alias(__libc_cond_signal_stub,__libc_cond_catchall_stub) 175 __strong_alias(__libc_cond_broadcast_stub,__libc_cond_catchall_stub) 176 __strong_alias(__libc_cond_destroy_stub,__libc_cond_catchall_stub) 177 178 int 179 __libc_cond_init_stub(cond_t *c, const condattr_t *a) 180 { 181 /* LINTED deliberate lack of effect */ 182 (void)c; 183 /* LINTED deliberate lack of effect */ 184 (void)a; 185 186 CHECK_NOT_THREADED(); 187 188 return (0); 189 } 190 191 int 192 __libc_cond_wait_stub(cond_t *c, mutex_t *m) 193 { 194 /* LINTED deliberate lack of effect */ 195 (void)c; 196 /* LINTED deliberate lack of effect */ 197 (void)m; 198 199 CHECK_NOT_THREADED(); 200 201 return (0); 202 } 203 204 int 205 __libc_cond_timedwait_stub(cond_t *c, mutex_t *m, const struct timespec *t) 206 { 207 /* LINTED deliberate lack of effect */ 208 (void)c; 209 /* LINTED deliberate lack of effect */ 210 (void)m; 211 /* LINTED deliberate lack of effect */ 212 (void)t; 213 214 CHECK_NOT_THREADED(); 215 216 return (0); 217 } 218 219 int 220 __libc_cond_catchall_stub(cond_t *c) 221 { 222 /* LINTED deliberate lack of effect */ 223 (void)c; 224 225 CHECK_NOT_THREADED(); 226 227 return (0); 228 } 229 230 231 /* read-write locks */ 232 233 int __libc_rwlock_catchall_stub(rwlock_t *); 234 235 __weak_alias(__libc_rwlock_init,__libc_rwlock_init_stub) 236 __weak_alias(__libc_rwlock_rdlock,__libc_rwlock_catchall_stub) 237 __weak_alias(__libc_rwlock_wrlock,__libc_rwlock_catchall_stub) 238 __weak_alias(__libc_rwlock_tryrdlock,__libc_rwlock_catchall_stub) 239 __weak_alias(__libc_rwlock_trywrlock,__libc_rwlock_catchall_stub) 240 __weak_alias(__libc_rwlock_unlock,__libc_rwlock_catchall_stub) 241 __weak_alias(__libc_rwlock_destroy,__libc_rwlock_catchall_stub) 242 243 __strong_alias(__libc_rwlock_rdlock_stub,__libc_rwlock_catchall_stub) 244 __strong_alias(__libc_rwlock_wrlock_stub,__libc_rwlock_catchall_stub) 245 __strong_alias(__libc_rwlock_tryrdlock_stub,__libc_rwlock_catchall_stub) 246 __strong_alias(__libc_rwlock_trywrlock_stub,__libc_rwlock_catchall_stub) 247 __strong_alias(__libc_rwlock_unlock_stub,__libc_rwlock_catchall_stub) 248 __strong_alias(__libc_rwlock_destroy_stub,__libc_rwlock_catchall_stub) 249 250 251 int 252 __libc_rwlock_init_stub(rwlock_t *l, const rwlockattr_t *a) 253 { 254 /* LINTED deliberate lack of effect */ 255 (void)l; 256 /* LINTED deliberate lack of effect */ 257 (void)a; 258 259 CHECK_NOT_THREADED(); 260 261 return (0); 262 } 263 264 int 265 __libc_rwlock_catchall_stub(rwlock_t *l) 266 { 267 /* LINTED deliberate lack of effect */ 268 (void)l; 269 270 CHECK_NOT_THREADED(); 271 272 return (0); 273 } 274 275 276 /* 277 * thread-specific data; we need to actually provide a simple TSD 278 * implementation, since some thread-safe libraries want to use it. 279 */ 280 281 #define TSD_KEYS_MAX 64 282 283 static struct { 284 void *tsd_val; 285 void (*tsd_dtor)(void *); 286 int tsd_inuse; 287 } __libc_tsd[TSD_KEYS_MAX]; 288 static int __libc_tsd_nextkey; 289 290 __weak_alias(__libc_thr_keycreate,__libc_thr_keycreate_stub) 291 __weak_alias(__libc_thr_setspecific,__libc_thr_setspecific_stub) 292 __weak_alias(__libc_thr_getspecific,__libc_thr_getspecific_stub) 293 __weak_alias(__libc_thr_keydelete,__libc_thr_keydelete_stub) 294 295 int 296 __libc_thr_keycreate_stub(thread_key_t *k, void (*d)(void *)) 297 { 298 int i; 299 300 for (i = __libc_tsd_nextkey; i < TSD_KEYS_MAX; i++) { 301 if (__libc_tsd[i].tsd_inuse == 0) 302 goto out; 303 } 304 305 for (i = 0; i < __libc_tsd_nextkey; i++) { 306 if (__libc_tsd[i].tsd_inuse == 0) 307 goto out; 308 } 309 310 return (EAGAIN); 311 312 out: 313 /* 314 * XXX We don't actually do anything with the destructor. We 315 * XXX probably should. 316 */ 317 __libc_tsd[i].tsd_inuse = 1; 318 __libc_tsd_nextkey = (i + i) % TSD_KEYS_MAX; 319 __libc_tsd[i].tsd_dtor = d; 320 *k = i; 321 322 return (0); 323 } 324 325 int 326 __libc_thr_setspecific_stub(thread_key_t k, const void *v) 327 { 328 329 __libc_tsd[k].tsd_val = __UNCONST(v); 330 331 return (0); 332 } 333 334 void * 335 __libc_thr_getspecific_stub(thread_key_t k) 336 { 337 338 return (__libc_tsd[k].tsd_val); 339 } 340 341 int 342 __libc_thr_keydelete_stub(thread_key_t k) 343 { 344 345 /* 346 * XXX Do not recycle key; see big comment in libpthread. 347 */ 348 349 __libc_tsd[k].tsd_dtor = NULL; 350 351 return (0); 352 } 353 354 355 /* misc. */ 356 357 __weak_alias(__libc_thr_once,__libc_thr_once_stub) 358 __weak_alias(__libc_thr_sigsetmask,__libc_thr_sigsetmask_stub) 359 __weak_alias(__libc_thr_self,__libc_thr_self_stub) 360 __weak_alias(__libc_thr_yield,__libc_thr_yield_stub) 361 __weak_alias(__libc_thr_create,__libc_thr_create_stub) 362 __weak_alias(__libc_thr_exit,__libc_thr_exit_stub) 363 __weak_alias(__libc_thr_setcancelstate,__libc_thr_setcancelstate_stub) 364 __weak_alias(__libc_thr_equal,__libc_thr_equal_stub) 365 __weak_alias(__libc_thr_curcpu,__libc_thr_curcpu_stub) 366 367 368 int 369 __libc_thr_once_stub(once_t *o, void (*r)(void)) 370 { 371 372 /* XXX Knowledge of libpthread types. */ 373 374 if (o->pto_done == 0) { 375 (*r)(); 376 o->pto_done = 1; 377 } 378 379 return (0); 380 } 381 382 int 383 __libc_thr_sigsetmask_stub(int h, const sigset_t *s, sigset_t *o) 384 { 385 386 CHECK_NOT_THREADED(); 387 388 return sigprocmask(h, s, o); 389 } 390 391 thr_t 392 __libc_thr_self_stub(void) 393 { 394 395 return ((thr_t) -1); 396 } 397 398 int 399 __libc_thr_yield_stub(void) 400 { 401 402 /* Nothing to do. */ 403 return (0); 404 } 405 406 int 407 __libc_thr_create_stub(thr_t *tp, const thrattr_t *ta, 408 void *(*f)(void *), void *a) 409 { 410 /* LINTED deliberate lack of effect */ 411 (void)tp; 412 /* LINTED deliberate lack of effect */ 413 (void)ta; 414 /* LINTED deliberate lack of effect */ 415 (void)f; 416 /* LINTED deliberate lack of effect */ 417 (void)a; 418 419 DIE(); 420 421 return (EOPNOTSUPP); 422 } 423 424 void 425 __libc_thr_exit_stub(void *v) 426 { 427 /* LINTED deliberate lack of effect */ 428 (void)v; 429 exit(0); 430 } 431 432 int 433 __libc_thr_setcancelstate_stub(int new, int *old) 434 { 435 /* LINTED deliberate lack of effect */ 436 (void)new; 437 438 /* LINTED deliberate lack of effect */ 439 (void)old; 440 441 CHECK_NOT_THREADED(); 442 443 return (0); 444 } 445 446 int 447 __libc_thr_equal_stub(pthread_t t1, pthread_t t2) 448 { 449 450 /* assert that t1=t2=pthread_self() */ 451 return (t1 == t2); 452 } 453 454 unsigned int 455 __libc_thr_curcpu_stub(void) 456 { 457 458 return (0); 459 } 460 461 #endif /* _REENTRANT */ 462
Indexes created Tue Sep 23 14:10:03 GMT 2025