lib/libc/gen/_pthread_stubs.c

   1 /*
   2  * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS''
  15  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libc/gen/_pthread_stubs.c,v 1.5 2001/06/11 23:18:22 iedowse Exp $
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #include "namespace.h"
  31 /* following should not be included in namespace here */
  32 #undef pthread_kill
  33 #undef pthread_sigmask
  34 #include <errno.h>
  35 #include <stdlib.h>
  36 #include <signal.h>
  37 #include "un-namespace.h"
  38 #include <pthread.h>
  39
  40 /*
  41  * Weak symbols: All libc internal usage of these functions should
  42  * use the weak symbol versions (_pthread_XXX).  If libpthread is
  43  * linked, it will override these functions with (non-weak) routines.
  44  * The _pthread_XXX functions are provided solely for internal libc
  45  * usage to avoid unwanted cancellation points and to differentiate
  46  * between application locks and libc locks (threads holding the
  47  * latter can't be allowed to exit/terminate).
  48  */
  49
  50 #define WRlc(f, n)                      \
  51     __weak_reference_asm(f, _ ## n);
  52 #define WR(f, n)                        \
  53     __weak_reference_asm(f, _ ## n);    \
  54     __weak_reference_asm(f, n)
  55
  56 /* XXX this needs something more clever, should not some of these return errors? */
  57 WR(__atfork, pthread_atfork);
  58 WR(stub_zero, pthread_attr_destroy);
  59 WR(stub_zero, pthread_attr_get_np);
  60 WR(stub_zero, pthread_attr_getaffinity_np);
  61 WR(stub_zero, pthread_attr_getdetachstate);
  62 WR(stub_zero, pthread_attr_getguardsize);
  63 WR(stub_zero, pthread_attr_getinheritsched);
  64 WR(stub_zero, pthread_attr_getschedparam);
  65 WR(stub_zero, pthread_attr_getschedpolicy);
  66 WR(stub_zero, pthread_attr_getscope);
  67 WR(stub_zero, pthread_attr_getstack);
  68 WR(stub_zero, pthread_attr_getstackaddr);
  69 WR(stub_zero, pthread_attr_getstacksize);
  70 WR(stub_zero, pthread_attr_init);
  71 WR(stub_zero, pthread_attr_setaffinity_np);
  72 WR(stub_zero, pthread_attr_setcreatesuspend_np);
  73 WR(stub_zero, pthread_attr_setdetachstate);
  74 WR(stub_zero, pthread_attr_setguardsize);
  75 WR(stub_zero, pthread_attr_setinheritsched);
  76 WR(stub_zero, pthread_attr_setschedparam);
  77 WR(stub_zero, pthread_attr_setschedpolicy);
  78 WR(stub_zero, pthread_attr_setscope);
  79 WR(stub_zero, pthread_attr_setstack);
  80 WR(stub_zero, pthread_attr_setstackaddr);
  81 WR(stub_zero, pthread_attr_setstacksize);
  82 WR(stub_zero, pthread_barrier_destroy);
  83 WR(stub_zero, pthread_barrier_init);
  84 WR(stub_zero, pthread_barrier_wait);
  85 WR(stub_zero, pthread_barrierattr_destroy);
  86 WR(stub_zero, pthread_barrierattr_getpshared);
  87 WR(stub_zero, pthread_barrierattr_init);
  88 WR(stub_zero, pthread_barrierattr_setpshared);
  89 WRlc(stub_zero, pthread_cancel);
  90 WR(stub_zero, pthread_cleanup_pop);
  91 WR(stub_zero, pthread_cleanup_push);
  92 WR(stub_zero, pthread_cond_broadcast);
  93 WR(stub_zero, pthread_cond_destroy);
  94 WR(stub_zero, pthread_cond_init);
  95 WR(stub_zero, pthread_cond_signal);
  96 WR(stub_zero, pthread_cond_timedwait);
  97 WR(stub_zero, pthread_cond_wait);
  98 WR(stub_zero, pthread_condattr_destroy);
  99 WR(stub_zero, pthread_condattr_getclock);
 100 WR(stub_zero, pthread_condattr_getpshared);
 101 WR(stub_zero, pthread_condattr_init);
 102 WR(stub_zero, pthread_condattr_setclock);
 103 WR(stub_zero, pthread_condattr_setpshared);
 104 WR(stub_zero, pthread_detach);
 105 WR(stub_equal, pthread_equal);
 106 WR(stub_exit, pthread_exit);
 107 WR(stub_zero, pthread_getaffinity_np);
 108 WR(stub_zero, pthread_getattr_np);
 109 WR(stub_zero, pthread_getconcurrency);
 110 WR(stub_zero, pthread_getcpuclockid);
 111 WR(stub_zero, pthread_getprio);
 112 WR(stub_zero, pthread_getschedparam);
 113 WR(stub_null, pthread_getspecific);
 114 WR(stub_zero, pthread_getthreadid_np);
 115 WR(stub_empty, pthread_init_early);
 116 WR(stub_isthreaded, pthread_is_threaded_np);
 117 WR(stub_zero, pthread_join);
 118 WR(stub_zero, pthread_key_create);
 119 WR(stub_zero, pthread_key_delete);
 120 WR(stub_zero, pthread_kill);
 121 WR(stub_main, pthread_main_np);
 122 WR(stub_zero, pthread_multi_np);
 123 WR(stub_zero, pthread_mutex_destroy);
 124 WR(stub_zero, pthread_mutex_getprioceiling);
 125 WR(stub_zero, pthread_mutex_init);
 126 WR(stub_zero, pthread_mutex_lock);
 127 WR(stub_zero, pthread_mutex_setprioceiling);
 128 WR(stub_zero, pthread_mutex_timedlock);
 129 WR(stub_zero, pthread_mutex_trylock);
 130 WR(stub_zero, pthread_mutex_unlock);
 131 WR(stub_zero, pthread_mutexattr_destroy);
 132 WR(stub_zero, pthread_mutexattr_getkind_np);
 133 WR(stub_zero, pthread_mutexattr_getprioceiling);
 134 WR(stub_zero, pthread_mutexattr_getprotocol);
 135 WR(stub_zero, pthread_mutexattr_getpshared);
 136 WR(stub_zero, pthread_mutexattr_gettype);
 137 WR(stub_zero, pthread_mutexattr_init);
 138 WR(stub_zero, pthread_mutexattr_setkind_np);
 139 WR(stub_zero, pthread_mutexattr_setprioceiling);
 140 WR(stub_zero, pthread_mutexattr_setprotocol);
 141 WR(stub_zero, pthread_mutexattr_setpshared);
 142 WR(stub_zero, pthread_mutexattr_settype);
 143 WR(stub_once, pthread_once);
 144 WR(stub_zero, pthread_resume_all_np);
 145 WR(stub_zero, pthread_resume_np);
 146 WR(stub_zero, pthread_rwlock_destroy);
 147 WR(stub_zero, pthread_rwlock_init);
 148 WR(stub_zero, pthread_rwlock_rdlock);
 149 WR(stub_zero, pthread_rwlock_timedrdlock);
 150 WR(stub_zero, pthread_rwlock_timedwrlock);
 151 WR(stub_zero, pthread_rwlock_tryrdlock);
 152 WR(stub_zero, pthread_rwlock_trywrlock);
 153 WR(stub_zero, pthread_rwlock_unlock);
 154 WR(stub_zero, pthread_rwlock_wrlock);
 155 WR(stub_zero, pthread_rwlockattr_destroy);
 156 WR(stub_zero, pthread_rwlockattr_getpshared);
 157 WR(stub_zero, pthread_rwlockattr_init);
 158 WR(stub_zero, pthread_rwlockattr_setpshared);
 159 WR(stub_self, pthread_self);
 160 WR(stub_pthread_get_name_np, pthread_get_name_np);
 161 WR(stub_pthread_getname_np, pthread_getname_np);
 162 WR(stub_zero, pthread_set_name_np);
 163 WR(stub_zero, pthread_setname_np);
 164 WR(stub_zero, pthread_setaffinity_np);
 165 WR(stub_zero, pthread_setcancelstate);
 166 WR(stub_zero, pthread_setcanceltype);
 167 WR(stub_zero, pthread_setconcurrency);
 168 WR(stub_zero, pthread_setprio);
 169 WR(stub_zero, pthread_setschedparam);
 170 WR(stub_zero, pthread_setspecific);
 171 WR(stub_sigmask, pthread_sigmask);
 172 WR(stub_zero, pthread_single_np);
 173 WR(stub_zero, pthread_spin_destroy);
 174 WR(stub_zero, pthread_spin_init);
 175 WR(stub_zero, pthread_spin_lock);
 176 WR(stub_zero, pthread_spin_trylock);
 177 WR(stub_zero, pthread_spin_unlock);
 178 WR(stub_zero, pthread_suspend_all_np);
 179 WR(stub_zero, pthread_suspend_np);
 180 WR(stub_zero, pthread_switch_add_np);
 181 WR(stub_zero, pthread_switch_delete_np);
 182 WR(stub_zero, pthread_testcancel);
 183 WR(stub_zero, pthread_timedjoin_np);
 184 WR(stub_zero, pthread_yield);
 185 WR(stub_zero, pthread_yield_np);
 186 WR(stub_zero, sem_close);
 187 WR(stub_zero, sem_destroy);
 188 WR(stub_zero, sem_getvalue);
 189 WR(stub_zero, sem_init);
 190 WR(stub_zero, sem_open);
 191 WR(stub_zero, sem_post);
 192 WR(stub_zero, sem_trywait);
 193 WR(stub_zero, sem_timedwait);
 194 WR(stub_zero, sem_unlink);
 195 WR(stub_zero, sem_wait);
 196
 197
 198 static int __used
 199 stub_zero(void)
 200 {
 201         return (0);
 202 }
 203
 204 static int __used
 205 stub_once(pthread_once_t *o, void (*r)(void))
 206 {
 207         if (o->__state != PTHREAD_DONE_INIT) {
 208                 (*r)();
 209                 o->__state = PTHREAD_DONE_INIT;
 210         }
 211
 212         return (0);
 213 }
 214
 215 static void * __used
 216 stub_null(void)
 217 {
 218         return (NULL);
 219 }
 220
 221 static void * __used
 222 stub_self(void)
 223 {
 224         static struct {} main_thread;
 225
 226         return (&main_thread);
 227 }
 228
 229 static int __used
 230 stub_main(void)
 231 {
 232         return (-1);
 233 }
 234
 235 static int __used
 236 stub_equal(pthread_t a, pthread_t b)
 237 {
 238         return (a == b);
 239 }
 240
 241 static void __used
 242 stub_empty(void)
 243 {
 244 }
 245
 246 static void __used
 247 stub_exit(void)
 248 {
 249         exit(0);
 250 }
 251
 252 static int __used
 253 stub_sigmask(int how, const sigset_t *set, sigset_t *oset)
 254 {
 255         if (_sigprocmask(how, set, oset))
 256                 return (errno);
 257         return (0);
 258 }
 259
 260 static void __used
 261 stub_pthread_get_name_np(pthread_t a, char *name, size_t len)
 262 {
 263         if (len)
 264                 name[0] = 0;
 265 }
 266
 267 static int __used
 268 stub_pthread_getname_np(pthread_t a, char *name, size_t len)
 269 {
 270         if (len)
 271                 name[0] = 0;
 272         return (0);
 273 }
 274
 275 /*
 276  * If libpthread is loaded, make sure it is initialised before
 277  * other libraries call pthread functions
 278  */
 279 void _pthread_init(void) __constructor(101);
 280 void _pthread_init_early(void);
 281 void
 282 _pthread_init(void)
 283 {
 284         _pthread_init_early();
 285 }
 286
 287 extern void (*cb_prepare)(void);
 288 extern void (*cb_parent)(void);
 289 extern void (*cb_child)(void);
 290 extern int __isthreaded;
 291
 292 static int __used
 293 __atfork(void (*prepare)(void), void (*parent)(void),
 294     void (*child)(void))
 295 {
 296         if (__isthreaded)
 297                 return (-1);
 298         cb_prepare = prepare;
 299         cb_parent = parent;
 300         cb_child = child;
 301         return (0);
 302 }
 303
 304 static int __used
 305 stub_isthreaded(void)
 306 {
 307         return (__isthreaded != 0);
 308 }