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: /repoman/r/ncvs/src/lib/libc/gen/_pthread_stubs.c,v 1.1 2001/01/24 12:59:20 deischen Exp $
  27  * $DragonFly: src/lib/libc/gen/_pthread_stubs.c,v 1.4 2005/05/09 12:43:40 davidxu Exp $
  28  */
  29
  30 #include <pthread.h>
  31
  32 void    *_pthread_getspecific_stub(pthread_key_t);
  33 int     _pthread_key_create_stub(pthread_key_t *, void (*)(void *));
  34 int     _pthread_key_delete_stub(pthread_key_t);
  35 int     _pthread_mutex_destroy_stub(pthread_mutex_t *);
  36 int     _pthread_mutex_init_stub(pthread_mutex_t *,
  37                                  const pthread_mutexattr_t *);
  38 int     _pthread_mutex_lock_stub(pthread_mutex_t *);
  39 int     _pthread_mutex_trylock_stub(pthread_mutex_t *);
  40 int     _pthread_mutex_unlock_stub(pthread_mutex_t *);
  41 int     _pthread_mutexattr_init_stub(pthread_mutexattr_t *);
  42 int     _pthread_mutexattr_destroy_stub(pthread_mutexattr_t *);
  43 int     _pthread_mutexattr_settype_stub(pthread_mutexattr_t *, int);
  44 int     _pthread_once_stub(pthread_once_t *, void (*)(void));
  45 int     _pthread_setspecific_stub(pthread_key_t, const void *);
  46
  47 /* define a null pthread structure just to satisfy _pthread_self */
  48 struct pthread {
  49 };
  50
  51 static struct pthread main_thread;
  52
  53 /*
  54  * Weak symbols: All libc internal usage of these functions should
  55  * use the weak symbol versions (_pthread_XXX).  If libpthread is
  56  * linked, it will override these functions with (non-weak) routines.
  57  * The _pthread_XXX functions are provided solely for internal libc
  58  * usage to avoid unwanted cancellation points and to differentiate
  59  * between application locks and libc locks (threads holding the
  60  * latter can't be allowed to exit/terminate).
  61  */
  62 __weak_reference(_pthread_getspecific_stub,_pthread_getspecific);
  63 __weak_reference(_pthread_key_create_stub,_pthread_key_create);
  64 __weak_reference(_pthread_key_delete_stub,_pthread_key_delete);
  65 __weak_reference(_pthread_mutex_destroy_stub,_pthread_mutex_destroy);
  66 __weak_reference(_pthread_mutex_init_stub,_pthread_mutex_init);
  67 __weak_reference(_pthread_mutex_lock_stub,_pthread_mutex_lock);
  68 __weak_reference(_pthread_mutex_trylock_stub,_pthread_mutex_trylock);
  69 __weak_reference(_pthread_mutex_unlock_stub,_pthread_mutex_unlock);
  70 __weak_reference(_pthread_mutexattr_init_stub,_pthread_mutexattr_init);
  71 __weak_reference(_pthread_mutexattr_destroy_stub,_pthread_mutexattr_destroy);
  72 __weak_reference(_pthread_mutexattr_settype_stub,_pthread_mutexattr_settype);
  73 __weak_reference(_pthread_once_stub,_pthread_once);
  74 __weak_reference(_pthread_setspecific_stub,_pthread_setspecific);
  75 __weak_reference(_pthread_self_stub,_pthread_self);
  76
  77 void *
  78 _pthread_getspecific_stub(pthread_key_t key __unused)
  79 {
  80         return (NULL);
  81 }
  82
  83 int
  84 _pthread_key_create_stub(pthread_key_t *key __unused,
  85                          void (*destructor) (void *) __unused)
  86 {
  87         return (0);
  88 }
  89
  90 int
  91 _pthread_key_delete_stub(pthread_key_t key __unused)
  92 {
  93         return (0);
  94 }
  95
  96 int
  97 _pthread_mutex_destroy_stub(pthread_mutex_t *mattr __unused)
  98 {
  99         return (0);
 100 }
 101
 102 int
 103 _pthread_mutex_init_stub(pthread_mutex_t *mutex __unused,
 104                          const pthread_mutexattr_t *mattr __unused)
 105 {
 106         return (0);
 107 }
 108
 109 int
 110 _pthread_mutex_lock_stub(pthread_mutex_t *mutex __unused)
 111 {
 112         return (0);
 113 }
 114
 115 int
 116 _pthread_mutex_trylock_stub(pthread_mutex_t *mutex __unused)
 117 {
 118         return (0);
 119 }
 120
 121 int
 122 _pthread_mutex_unlock_stub(pthread_mutex_t *mutex __unused)
 123 {
 124         return (0);
 125 }
 126
 127 int
 128 _pthread_mutexattr_init_stub(pthread_mutexattr_t *mattr __unused)
 129 {
 130         return (0);
 131 }
 132
 133 int
 134 _pthread_mutexattr_destroy_stub(pthread_mutexattr_t *mattr __unused)
 135 {
 136         return (0);
 137 }
 138
 139 int
 140 _pthread_mutexattr_settype_stub(pthread_mutexattr_t *mattr __unused,
 141                                 int type __unused)
 142 {
 143         return (0);
 144 }
 145
 146 int
 147 _pthread_once_stub(pthread_once_t *once_control __unused,
 148                    void (*init_routine) (void) __unused)
 149 {
 150         return (0);
 151 }
 152
 153 struct pthread *
 154 _pthread_self_stub(void)
 155 {
 156         return (&main_thread);
 157 }
 158 int
 159 _pthread_setspecific_stub(pthread_key_t key __unused,
 160                           const void *value __unused)
 161 {
 162         return (0);
 163 }
 164