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 <stdlib.h>
  31 #include <pthread.h>
  32
  33 /*
  34  * Weak symbols: All libc internal usage of these functions should
  35  * use the weak symbol versions (_pthread_XXX).  If libpthread is
  36  * linked, it will override these functions with (non-weak) routines.
  37  * The _pthread_XXX functions are provided solely for internal libc
  38  * usage to avoid unwanted cancellation points and to differentiate
  39  * between application locks and libc locks (threads holding the
  40  * latter can't be allowed to exit/terminate).
  41  */
  42
  43 #define WRlc(f, n)                      \
  44     __weak_reference_asm(f, _ ## n);
  45 #define WR(f, n)                        \
  46     __weak_reference_asm(f, _ ## n);    \
  47     __weak_reference_asm(f, n)
  48
  49 /* XXX this needs something more clever, should not some of these return errors? */
  50 WR(__atfork, pthread_atfork);
  51 WR(stub_zero, pthread_attr_destroy);
  52 WR(stub_zero, pthread_attr_get_np);
  53 WR(stub_zero, pthread_attr_getdetachstate);
  54 WR(stub_zero, pthread_attr_getguardsize);
  55 WR(stub_zero, pthread_attr_getinheritsched);
  56 WR(stub_zero, pthread_attr_getschedparam);
  57 WR(stub_zero, pthread_attr_getschedpolicy);
  58 WR(stub_zero, pthread_attr_getscope);
  59 WR(stub_zero, pthread_attr_getstack);
  60 WR(stub_zero, pthread_attr_getstackaddr);
  61 WR(stub_zero, pthread_attr_getstacksize);
  62 WR(stub_zero, pthread_attr_init);
  63 WR(stub_zero, pthread_attr_setcreatesuspend_np);
  64 WR(stub_zero, pthread_attr_setdetachstate);
  65 WR(stub_zero, pthread_attr_setguardsize);
  66 WR(stub_zero, pthread_attr_setinheritsched);
  67 WR(stub_zero, pthread_attr_setschedparam);
  68 WR(stub_zero, pthread_attr_setschedpolicy);
  69 WR(stub_zero, pthread_attr_setscope);
  70 WR(stub_zero, pthread_attr_setstack);
  71 WR(stub_zero, pthread_attr_setstackaddr);
  72 WR(stub_zero, pthread_attr_setstacksize);
  73 WR(stub_zero, pthread_barrier_destroy);
  74 WR(stub_zero, pthread_barrier_init);
  75 WR(stub_zero, pthread_barrier_wait);
  76 WR(stub_zero, pthread_barrierattr_destroy);
  77 WR(stub_zero, pthread_barrierattr_getpshared);
  78 WR(stub_zero, pthread_barrierattr_init);
  79 WR(stub_zero, pthread_barrierattr_setpshared);
  80 WRlc(stub_zero, pthread_cancel);
  81 WR(stub_zero, pthread_cleanup_pop);
  82 WR(stub_zero, pthread_cleanup_push);
  83 WR(stub_zero, pthread_cond_broadcast);
  84 WR(stub_zero, pthread_cond_destroy);
  85 WR(stub_zero, pthread_cond_init);
  86 WR(stub_zero, pthread_cond_signal);
  87 WR(stub_zero, pthread_cond_timedwait);
  88 WR(stub_zero, pthread_cond_wait);
  89 WR(stub_zero, pthread_condattr_destroy);
  90 WR(stub_zero, pthread_condattr_getclock);
  91 WR(stub_zero, pthread_condattr_getpshared);
  92 WR(stub_zero, pthread_condattr_init);
  93 WR(stub_zero, pthread_condattr_setclock);
  94 WR(stub_zero, pthread_condattr_setpshared);
  95 WR(stub_zero, pthread_detach);
  96 WR(stub_true, pthread_equal);
  97 WR(stub_exit, pthread_exit);
  98 WR(stub_zero, pthread_getaffinity_np);
  99 WR(stub_zero, pthread_getconcurrency);
 100 WR(stub_zero, pthread_getprio);
 101 WR(stub_zero, pthread_getschedparam);
 102 WR(stub_null, pthread_getspecific);
 103 WR(stub_empty, pthread_init_early);
 104 WR(stub_zero, pthread_join);
 105 WR(stub_zero, pthread_key_create);
 106 WR(stub_zero, pthread_key_delete);
 107 WR(stub_zero, pthread_kill);
 108 WR(stub_main, pthread_main_np);
 109 WR(stub_zero, pthread_multi_np);
 110 WR(stub_zero, pthread_mutex_destroy);
 111 WR(stub_zero, pthread_mutex_getprioceiling);
 112 WR(stub_zero, pthread_mutex_init);
 113 WR(stub_zero, pthread_mutex_lock);
 114 WR(stub_zero, pthread_mutex_setprioceiling);
 115 WR(stub_zero, pthread_mutex_timedlock);
 116 WR(stub_zero, pthread_mutex_trylock);
 117 WR(stub_zero, pthread_mutex_unlock);
 118 WR(stub_zero, pthread_mutexattr_destroy);
 119 WR(stub_zero, pthread_mutexattr_getkind_np);
 120 WR(stub_zero, pthread_mutexattr_getprioceiling);
 121 WR(stub_zero, pthread_mutexattr_getprotocol);
 122 WR(stub_zero, pthread_mutexattr_getpshared);
 123 WR(stub_zero, pthread_mutexattr_gettype);
 124 WR(stub_zero, pthread_mutexattr_init);
 125 WR(stub_zero, pthread_mutexattr_setkind_np);
 126 WR(stub_zero, pthread_mutexattr_setprioceiling);
 127 WR(stub_zero, pthread_mutexattr_setprotocol);
 128 WR(stub_zero, pthread_mutexattr_setpshared);
 129 WR(stub_zero, pthread_mutexattr_settype);
 130 WR(stub_once, pthread_once);
 131 WR(stub_zero, pthread_resume_all_np);
 132 WR(stub_zero, pthread_resume_np);
 133 WR(stub_zero, pthread_rwlock_destroy);
 134 WR(stub_zero, pthread_rwlock_init);
 135 WR(stub_zero, pthread_rwlock_rdlock);
 136 WR(stub_zero, pthread_rwlock_timedrdlock);
 137 WR(stub_zero, pthread_rwlock_timedwrlock);
 138 WR(stub_zero, pthread_rwlock_tryrdlock);
 139 WR(stub_zero, pthread_rwlock_trywrlock);
 140 WR(stub_zero, pthread_rwlock_unlock);
 141 WR(stub_zero, pthread_rwlock_wrlock);
 142 WR(stub_zero, pthread_rwlockattr_destroy);
 143 WR(stub_zero, pthread_rwlockattr_getpshared);
 144 WR(stub_zero, pthread_rwlockattr_init);
 145 WR(stub_zero, pthread_rwlockattr_setpshared);
 146 WR(stub_self, pthread_self);
 147 WR(stub_zero, pthread_set_name_np);
 148 WR(stub_zero, pthread_setaffinity_np);
 149 WR(stub_zero, pthread_setcancelstate);
 150 WR(stub_zero, pthread_setcanceltype);
 151 WR(stub_zero, pthread_setconcurrency);
 152 WR(stub_zero, pthread_setprio);
 153 WR(stub_zero, pthread_setschedparam);
 154 WR(stub_zero, pthread_setspecific);
 155 WR(stub_zero, pthread_sigmask);
 156 WR(stub_zero, pthread_single_np);
 157 WR(stub_zero, pthread_spin_destroy);
 158 WR(stub_zero, pthread_spin_init);
 159 WR(stub_zero, pthread_spin_lock);
 160 WR(stub_zero, pthread_spin_trylock);
 161 WR(stub_zero, pthread_spin_unlock);
 162 WR(stub_zero, pthread_suspend_all_np);
 163 WR(stub_zero, pthread_suspend_np);
 164 WR(stub_zero, pthread_switch_add_np);
 165 WR(stub_zero, pthread_switch_delete_np);
 166 WR(stub_zero, pthread_testcancel);
 167 WR(stub_zero, pthread_timedjoin_np);
 168 WR(stub_zero, pthread_yield);
 169 WR(stub_zero, sched_yield);
 170 WR(stub_zero, sem_close);
 171 WR(stub_zero, sem_destroy);
 172 WR(stub_zero, sem_getvalue);
 173 WR(stub_zero, sem_init);
 174 WR(stub_zero, sem_open);
 175 WR(stub_zero, sem_post);
 176 WR(stub_zero, sem_trywait);
 177 WR(stub_zero, sem_timedwait);
 178 WR(stub_zero, sem_unlink);
 179 WR(stub_zero, sem_wait);
 180
 181
 182 static int __used
 183 stub_zero(void)
 184 {
 185         return (0);
 186 }
 187
 188 static int __used
 189 stub_once(pthread_once_t *o, void (*r)(void))
 190 {
 191         if (o->state != PTHREAD_DONE_INIT) {
 192                 (*r)();
 193                 o->state = PTHREAD_DONE_INIT;
 194         }
 195
 196         return (0);
 197 }
 198
 199 static void * __used
 200 stub_null(void)
 201 {
 202         return (NULL);
 203 }
 204
 205 static void * __used
 206 stub_self(void)
 207 {
 208         static struct {} main_thread;
 209
 210         return (&main_thread);
 211 }
 212
 213 static int __used
 214 stub_main(void)
 215 {
 216         return (-1);
 217 }
 218
 219 static int __used
 220 stub_true(void)
 221 {
 222         return (1);
 223 }
 224
 225 static void __used
 226 stub_empty(void)
 227 {
 228 }
 229
 230 static void __used
 231 stub_exit(void)
 232 {
 233         exit(0);
 234 }
 235
 236 /*
 237  * If libpthread is loaded, make sure it is initialised before
 238  * other libraries call pthread functions
 239  */
 240 void _pthread_init(void) __constructor(101);
 241 void _pthread_init_early(void);
 242 void
 243 _pthread_init(void)
 244 {
 245         _pthread_init_early();
 246 }
 247
 248 extern void (*cb_prepare)(void);
 249 extern void (*cb_parent)(void);
 250 extern void (*cb_child)(void);
 251 extern int __isthreaded;
 252
 253 static int __used
 254 __atfork(void (*prepare)(void), void (*parent)(void),
 255     void (*child)(void))
 256 {
 257         if (__isthreaded)
 258                 return (-1);
 259         cb_prepare = prepare;
 260         cb_parent = parent;
 261         cb_child = child;
 262         return (0);
 263 }