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 <stdlib.h>
  30 #include <pthread.h>
  31
  32 /*
  33  * Weak symbols: All libc internal usage of these functions should
  34  * use the weak symbol versions (_pthread_XXX).  If libpthread is
  35  * linked, it will override these functions with (non-weak) routines.
  36  * The _pthread_XXX functions are provided solely for internal libc
  37  * usage to avoid unwanted cancellation points and to differentiate
  38  * between application locks and libc locks (threads holding the
  39  * latter can't be allowed to exit/terminate).
  40  */
  41
  42 #define WR(f, n)                        \
  43     __weak_reference(f, _ ## n);        \
  44     __weak_reference(f, n)
  45
  46 WR(__atfork, pthread_atfork);
  47 WR(stub_zero, pthread_attr_destroy);
  48 WR(stub_zero, pthread_attr_get_np);
  49 WR(stub_zero, pthread_attr_getdetachstate);
  50 WR(stub_zero, pthread_attr_getguardsize);
  51 WR(stub_zero, pthread_attr_getinheritsched);
  52 WR(stub_zero, pthread_attr_getschedparam);
  53 WR(stub_zero, pthread_attr_getschedpolicy);
  54 WR(stub_zero, pthread_attr_getscope);
  55 WR(stub_zero, pthread_attr_getstack);
  56 WR(stub_zero, pthread_attr_getstackaddr);
  57 WR(stub_zero, pthread_attr_getstacksize);
  58 WR(stub_zero, pthread_attr_init);
  59 WR(stub_zero, pthread_attr_setcreatesuspend_np);
  60 WR(stub_zero, pthread_attr_setdetachstate);
  61 WR(stub_zero, pthread_attr_setguardsize);
  62 WR(stub_zero, pthread_attr_setinheritsched);
  63 WR(stub_zero, pthread_attr_setschedparam);
  64 WR(stub_zero, pthread_attr_setschedpolicy);
  65 WR(stub_zero, pthread_attr_setscope);
  66 WR(stub_zero, pthread_attr_setstack);
  67 WR(stub_zero, pthread_attr_setstackaddr);
  68 WR(stub_zero, pthread_attr_setstacksize);
  69 WR(stub_zero, pthread_barrier_destroy);
  70 WR(stub_zero, pthread_barrier_init);
  71 WR(stub_zero, pthread_barrier_wait);
  72 WR(stub_zero, pthread_barrierattr_destroy);
  73 WR(stub_zero, pthread_barrierattr_getpshared);
  74 WR(stub_zero, pthread_barrierattr_init);
  75 WR(stub_zero, pthread_barrierattr_setpshared);
  76 WR(stub_zero, pthread_cancel);
  77 WR(stub_zero, pthread_cleanup_pop);
  78 WR(stub_zero, pthread_cleanup_push);
  79 WR(stub_zero, pthread_cond_broadcast);
  80 WR(stub_zero, pthread_cond_destroy);
  81 WR(stub_zero, pthread_cond_init);
  82 WR(stub_zero, pthread_cond_signal);
  83 WR(stub_zero, pthread_cond_timedwait);
  84 WR(stub_zero, pthread_cond_wait);
  85 WR(stub_zero, pthread_condattr_destroy);
  86 WR(stub_zero, pthread_condattr_getclock);
  87 WR(stub_zero, pthread_condattr_getpshared);
  88 WR(stub_zero, pthread_condattr_init);
  89 WR(stub_zero, pthread_condattr_setclock);
  90 WR(stub_zero, pthread_condattr_setpshared);
  91 WR(stub_zero, pthread_detach);
  92 WR(stub_true, pthread_equal);
  93 WR(stub_exit, pthread_exit);
  94 WR(stub_zero, pthread_getconcurrency);
  95 WR(stub_zero, pthread_getprio);
  96 WR(stub_zero, pthread_getschedparam);
  97 WR(stub_null, pthread_getspecific);
  98 WR(stub_empty, pthread_init_early);
  99 WR(stub_zero, pthread_join);
 100 WR(stub_zero, pthread_key_create);
 101 WR(stub_zero, pthread_key_delete);
 102 WR(stub_zero, pthread_kill);
 103 WR(stub_main, pthread_main_np);
 104 WR(stub_zero, pthread_multi_np);
 105 WR(stub_zero, pthread_mutex_destroy);
 106 WR(stub_zero, pthread_mutex_getprioceiling);
 107 WR(stub_zero, pthread_mutex_init);
 108 WR(stub_zero, pthread_mutex_lock);
 109 WR(stub_zero, pthread_mutex_setprioceiling);
 110 WR(stub_zero, pthread_mutex_timedlock);
 111 WR(stub_zero, pthread_mutex_trylock);
 112 WR(stub_zero, pthread_mutex_unlock);
 113 WR(stub_zero, pthread_mutexattr_destroy);
 114 WR(stub_zero, pthread_mutexattr_getkind_np);
 115 WR(stub_zero, pthread_mutexattr_getprioceiling);
 116 WR(stub_zero, pthread_mutexattr_getprotocol);
 117 WR(stub_zero, pthread_mutexattr_getpshared);
 118 WR(stub_zero, pthread_mutexattr_gettype);
 119 WR(stub_zero, pthread_mutexattr_init);
 120 WR(stub_zero, pthread_mutexattr_setkind_np);
 121 WR(stub_zero, pthread_mutexattr_setprioceiling);
 122 WR(stub_zero, pthread_mutexattr_setprotocol);
 123 WR(stub_zero, pthread_mutexattr_setpshared);
 124 WR(stub_zero, pthread_mutexattr_settype);
 125 WR(stub_once, pthread_once);
 126 WR(stub_zero, pthread_resume_all_np);
 127 WR(stub_zero, pthread_resume_np);
 128 WR(stub_zero, pthread_rwlock_destroy);
 129 WR(stub_zero, pthread_rwlock_init);
 130 WR(stub_zero, pthread_rwlock_rdlock);
 131 WR(stub_zero, pthread_rwlock_timedrdlock);
 132 WR(stub_zero, pthread_rwlock_timedwrlock);
 133 WR(stub_zero, pthread_rwlock_tryrdlock);
 134 WR(stub_zero, pthread_rwlock_trywrlock);
 135 WR(stub_zero, pthread_rwlock_unlock);
 136 WR(stub_zero, pthread_rwlock_wrlock);
 137 WR(stub_zero, pthread_rwlockattr_destroy);
 138 WR(stub_zero, pthread_rwlockattr_getpshared);
 139 WR(stub_zero, pthread_rwlockattr_init);
 140 WR(stub_zero, pthread_rwlockattr_setpshared);
 141 WR(stub_self, pthread_self);
 142 WR(stub_zero, pthread_set_name_np);
 143 WR(stub_zero, pthread_setcancelstate);
 144 WR(stub_zero, pthread_setcanceltype);
 145 WR(stub_zero, pthread_setconcurrency);
 146 WR(stub_zero, pthread_setprio);
 147 WR(stub_zero, pthread_setschedparam);
 148 WR(stub_zero, pthread_setspecific);
 149 WR(stub_zero, pthread_sigmask);
 150 WR(stub_zero, pthread_single_np);
 151 WR(stub_zero, pthread_spin_destroy);
 152 WR(stub_zero, pthread_spin_init);
 153 WR(stub_zero, pthread_spin_lock);
 154 WR(stub_zero, pthread_spin_trylock);
 155 WR(stub_zero, pthread_spin_unlock);
 156 WR(stub_zero, pthread_suspend_all_np);
 157 WR(stub_zero, pthread_suspend_np);
 158 WR(stub_zero, pthread_switch_add_np);
 159 WR(stub_zero, pthread_switch_delete_np);
 160 WR(stub_zero, pthread_testcancel);
 161 WR(stub_zero, pthread_timedjoin_np);
 162 WR(stub_zero, pthread_yield);
 163 WR(stub_zero, sched_yield);
 164 WR(stub_zero, sem_close);
 165 WR(stub_zero, sem_destroy);
 166 WR(stub_zero, sem_getvalue);
 167 WR(stub_zero, sem_init);
 168 WR(stub_zero, sem_open);
 169 WR(stub_zero, sem_post);
 170 WR(stub_zero, sem_trywait);
 171 WR(stub_zero, sem_timedwait);
 172 WR(stub_zero, sem_unlink);
 173 WR(stub_zero, sem_wait);
 174
 175
 176 static int __used
 177 stub_zero(void)
 178 {
 179         return (0);
 180 }
 181
 182 static int __used
 183 stub_once(pthread_once_t *o, void (*r)(void))
 184 {
 185         if (o->state != PTHREAD_DONE_INIT) {
 186                 (*r)();
 187                 o->state = PTHREAD_DONE_INIT;
 188         }
 189
 190         return (0);
 191 }
 192
 193 static void * __used
 194 stub_null(void)
 195 {
 196         return (NULL);
 197 }
 198
 199 static void * __used
 200 stub_self(void)
 201 {
 202         static struct {} main_thread;
 203
 204         return (&main_thread);
 205 }
 206
 207 static int __used
 208 stub_main(void)
 209 {
 210         return (-1);
 211 }
 212
 213 static int __used
 214 stub_true(void)
 215 {
 216         return (1);
 217 }
 218
 219 static void __used
 220 stub_empty(void)
 221 {
 222 }
 223
 224 static void __used
 225 stub_exit(void)
 226 {
 227         exit(0);
 228 }
 229
 230 /*
 231  * If libpthread is loaded, make sure it is initialised before
 232  * other libraries call pthread functions
 233  */
 234 void _pthread_init(void) __constructor(101);
 235 void _pthread_init_early(void);
 236 void
 237 _pthread_init(void)
 238 {
 239         _pthread_init_early();
 240 }
 241
 242 extern void (*cb_prepare)(void);
 243 extern void (*cb_parent)(void);
 244 extern void (*cb_child)(void);
 245 extern int __isthreaded;
 246
 247 static int __used
 248 __atfork(void (*prepare)(void), void (*parent)(void),
 249     void (*child)(void))
 250 {
 251         if (__isthreaded)
 252                 return (-1);
 253         cb_prepare = prepare;
 254         cb_parent = parent;
 255         cb_child = child;
 256         return (0);
 257 }