libgcc/gthr-single.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000, 2004, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef GCC_GTHR_SINGLE_H
  28 #define GCC_GTHR_SINGLE_H
  29
  30 /* Just provide compatibility for mutex handling.  */
  31
  32 typedef int __gthread_key_t;
  33 typedef int __gthread_once_t;
  34 typedef int __gthread_mutex_t;
  35 typedef int __gthread_recursive_mutex_t;
  36
  37 #define __GTHREAD_ONCE_INIT 0
  38 #define __GTHREAD_MUTEX_INIT 0
  39 #define __GTHREAD_MUTEX_INIT_FUNCTION(mx)
  40 #define __GTHREAD_RECURSIVE_MUTEX_INIT 0
  41
  42 #define UNUSED __attribute__((unused))
  43
  44 #ifdef _LIBOBJC
  45
  46 /* Thread local storage for a single thread */
  47 static void *thread_local_storage = NULL;
  48
  49 /* Backend initialization functions */
  50
  51 /* Initialize the threads subsystem.  */
  52 static inline int
  53 __gthread_objc_init_thread_system (void)
  54 {
  55   /* No thread support available */
  56   return -1;
  57 }
  58
  59 /* Close the threads subsystem.  */
  60 static inline int
  61 __gthread_objc_close_thread_system (void)
  62 {
  63   /* No thread support available */
  64   return -1;
  65 }
  66
  67 /* Backend thread functions */
  68
  69 /* Create a new thread of execution.  */
  70 static inline objc_thread_t
  71 __gthread_objc_thread_detach (void (* func)(void *), void * arg UNUSED)
  72 {
  73   /* No thread support available */
  74   return NULL;
  75 }
  76
  77 /* Set the current thread's priority.  */
  78 static inline int
  79 __gthread_objc_thread_set_priority (int priority UNUSED)
  80 {
  81   /* No thread support available */
  82   return -1;
  83 }
  84
  85 /* Return the current thread's priority.  */
  86 static inline int
  87 __gthread_objc_thread_get_priority (void)
  88 {
  89   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  90 }
  91
  92 /* Yield our process time to another thread.  */
  93 static inline void
  94 __gthread_objc_thread_yield (void)
  95 {
  96   return;
  97 }
  98
  99 /* Terminate the current thread.  */
 100 static inline int
 101 __gthread_objc_thread_exit (void)
 102 {
 103   /* No thread support available */
 104   /* Should we really exit the program */
 105   /* exit (&__objc_thread_exit_status); */
 106   return -1;
 107 }
 108
 109 /* Returns an integer value which uniquely describes a thread.  */
 110 static inline objc_thread_t
 111 __gthread_objc_thread_id (void)
 112 {
 113   /* No thread support, use 1.  */
 114   return (objc_thread_t) 1;
 115 }
 116
 117 /* Sets the thread's local storage pointer.  */
 118 static inline int
 119 __gthread_objc_thread_set_data (void *value)
 120 {
 121   thread_local_storage = value;
 122   return 0;
 123 }
 124
 125 /* Returns the thread's local storage pointer.  */
 126 static inline void *
 127 __gthread_objc_thread_get_data (void)
 128 {
 129   return thread_local_storage;
 130 }
 131
 132 /* Backend mutex functions */
 133
 134 /* Allocate a mutex.  */
 135 static inline int
 136 __gthread_objc_mutex_allocate (objc_mutex_t mutex UNUSED)
 137 {
 138   return 0;
 139 }
 140
 141 /* Deallocate a mutex.  */
 142 static inline int
 143 __gthread_objc_mutex_deallocate (objc_mutex_t mutex UNUSED)
 144 {
 145   return 0;
 146 }
 147
 148 /* Grab a lock on a mutex.  */
 149 static inline int
 150 __gthread_objc_mutex_lock (objc_mutex_t mutex UNUSED)
 151 {
 152   /* There can only be one thread, so we always get the lock */
 153   return 0;
 154 }
 155
 156 /* Try to grab a lock on a mutex.  */
 157 static inline int
 158 __gthread_objc_mutex_trylock (objc_mutex_t mutex UNUSED)
 159 {
 160   /* There can only be one thread, so we always get the lock */
 161   return 0;
 162 }
 163
 164 /* Unlock the mutex */
 165 static inline int
 166 __gthread_objc_mutex_unlock (objc_mutex_t mutex UNUSED)
 167 {
 168   return 0;
 169 }
 170
 171 /* Backend condition mutex functions */
 172
 173 /* Allocate a condition.  */
 174 static inline int
 175 __gthread_objc_condition_allocate (objc_condition_t condition UNUSED)
 176 {
 177   return 0;
 178 }
 179
 180 /* Deallocate a condition.  */
 181 static inline int
 182 __gthread_objc_condition_deallocate (objc_condition_t condition UNUSED)
 183 {
 184   return 0;
 185 }
 186
 187 /* Wait on the condition */
 188 static inline int
 189 __gthread_objc_condition_wait (objc_condition_t condition UNUSED,
 190                                objc_mutex_t mutex UNUSED)
 191 {
 192   return 0;
 193 }
 194
 195 /* Wake up all threads waiting on this condition.  */
 196 static inline int
 197 __gthread_objc_condition_broadcast (objc_condition_t condition UNUSED)
 198 {
 199   return 0;
 200 }
 201
 202 /* Wake up one thread waiting on this condition.  */
 203 static inline int
 204 __gthread_objc_condition_signal (objc_condition_t condition UNUSED)
 205 {
 206   return 0;
 207 }
 208
 209 #else /* _LIBOBJC */
 210
 211 static inline int
 212 __gthread_active_p (void)
 213 {
 214   return 0;
 215 }
 216
 217 static inline int
 218 __gthread_once (__gthread_once_t *__once UNUSED, void (*__func) (void) UNUSED)
 219 {
 220   return 0;
 221 }
 222
 223 static inline int UNUSED
 224 __gthread_key_create (__gthread_key_t *__key UNUSED, void (*__func) (void *) UNUSED)
 225 {
 226   return 0;
 227 }
 228
 229 static int UNUSED
 230 __gthread_key_delete (__gthread_key_t __key UNUSED)
 231 {
 232   return 0;
 233 }
 234
 235 static inline void *
 236 __gthread_getspecific (__gthread_key_t __key UNUSED)
 237 {
 238   return 0;
 239 }
 240
 241 static inline int
 242 __gthread_setspecific (__gthread_key_t __key UNUSED, const void *__v UNUSED)
 243 {
 244   return 0;
 245 }
 246
 247 static inline int
 248 __gthread_mutex_destroy (__gthread_mutex_t *__mutex UNUSED)
 249 {
 250   return 0;
 251 }
 252
 253 static inline int
 254 __gthread_mutex_lock (__gthread_mutex_t *__mutex UNUSED)
 255 {
 256   return 0;
 257 }
 258
 259 static inline int
 260 __gthread_mutex_trylock (__gthread_mutex_t *__mutex UNUSED)
 261 {
 262   return 0;
 263 }
 264
 265 static inline int
 266 __gthread_mutex_unlock (__gthread_mutex_t *__mutex UNUSED)
 267 {
 268   return 0;
 269 }
 270
 271 static inline int
 272 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
 273 {
 274   return __gthread_mutex_lock (__mutex);
 275 }
 276
 277 static inline int
 278 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
 279 {
 280   return __gthread_mutex_trylock (__mutex);
 281 }
 282
 283 static inline int
 284 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
 285 {
 286   return __gthread_mutex_unlock (__mutex);
 287 }
 288
 289 #endif /* _LIBOBJC */
 290
 291 #undef UNUSED
 292
 293 #endif /* ! GCC_GTHR_SINGLE_H */