libgcc/gthr-single.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997-2024 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef GCC_GTHR_SINGLE_H
  27 #define GCC_GTHR_SINGLE_H
  28
  29 /* Just provide compatibility for mutex handling.  */
  30
  31 typedef int __gthread_key_t;
  32 typedef int __gthread_once_t;
  33 typedef int __gthread_mutex_t;
  34 typedef int __gthread_recursive_mutex_t;
  35
  36 #define __GTHREAD_ONCE_INIT 0
  37 #define __GTHREAD_MUTEX_INIT 0
  38 #define __GTHREAD_MUTEX_INIT_FUNCTION(mx) do {} while (0)
  39 #define __GTHREAD_RECURSIVE_MUTEX_INIT 0
  40
  41 #ifdef __has_attribute
  42 # if __has_attribute(__always_inline__)
  43 #  define __GTHREAD_ALWAYS_INLINE __attribute__((__always_inline__))
  44 # endif
  45 #endif
  46 #ifndef __GTHREAD_ALWAYS_INLINE
  47 # define __GTHREAD_ALWAYS_INLINE
  48 #endif
  49
  50 #ifdef __cplusplus
  51 # define __GTHREAD_INLINE inline __GTHREAD_ALWAYS_INLINE
  52 #else
  53 # define __GTHREAD_INLINE static inline
  54 #endif
  55
  56 #define UNUSED __attribute__((__unused__))
  57
  58 #ifdef _LIBOBJC
  59
  60 /* Thread local storage for a single thread */
  61 static void *thread_local_storage = NULL;
  62
  63 /* Backend initialization functions */
  64
  65 /* Initialize the threads subsystem.  */
  66 static inline int
  67 __gthread_objc_init_thread_system (void)
  68 {
  69   /* No thread support available */
  70   return -1;
  71 }
  72
  73 /* Close the threads subsystem.  */
  74 static inline int
  75 __gthread_objc_close_thread_system (void)
  76 {
  77   /* No thread support available */
  78   return -1;
  79 }
  80
  81 /* Backend thread functions */
  82
  83 /* Create a new thread of execution.  */
  84 static inline objc_thread_t
  85 __gthread_objc_thread_detach (void (* func)(void *), void * arg UNUSED)
  86 {
  87   /* No thread support available */
  88   return NULL;
  89 }
  90
  91 /* Set the current thread's priority.  */
  92 static inline int
  93 __gthread_objc_thread_set_priority (int priority UNUSED)
  94 {
  95   /* No thread support available */
  96   return -1;
  97 }
  98
  99 /* Return the current thread's priority.  */
 100 static inline int
 101 __gthread_objc_thread_get_priority (void)
 102 {
 103   return OBJC_THREAD_INTERACTIVE_PRIORITY;
 104 }
 105
 106 /* Yield our process time to another thread.  */
 107 static inline void
 108 __gthread_objc_thread_yield (void)
 109 {
 110   return;
 111 }
 112
 113 /* Terminate the current thread.  */
 114 static inline int
 115 __gthread_objc_thread_exit (void)
 116 {
 117   /* No thread support available */
 118   /* Should we really exit the program */
 119   /* exit (&__objc_thread_exit_status); */
 120   return -1;
 121 }
 122
 123 /* Returns an integer value which uniquely describes a thread.  */
 124 static inline objc_thread_t
 125 __gthread_objc_thread_id (void)
 126 {
 127   /* No thread support, use 1.  */
 128   return (objc_thread_t) 1;
 129 }
 130
 131 /* Sets the thread's local storage pointer.  */
 132 static inline int
 133 __gthread_objc_thread_set_data (void *value)
 134 {
 135   thread_local_storage = value;
 136   return 0;
 137 }
 138
 139 /* Returns the thread's local storage pointer.  */
 140 static inline void *
 141 __gthread_objc_thread_get_data (void)
 142 {
 143   return thread_local_storage;
 144 }
 145
 146 /* Backend mutex functions */
 147
 148 /* Allocate a mutex.  */
 149 static inline int
 150 __gthread_objc_mutex_allocate (objc_mutex_t mutex UNUSED)
 151 {
 152   return 0;
 153 }
 154
 155 /* Deallocate a mutex.  */
 156 static inline int
 157 __gthread_objc_mutex_deallocate (objc_mutex_t mutex UNUSED)
 158 {
 159   return 0;
 160 }
 161
 162 /* Grab a lock on a mutex.  */
 163 static inline int
 164 __gthread_objc_mutex_lock (objc_mutex_t mutex UNUSED)
 165 {
 166   /* There can only be one thread, so we always get the lock */
 167   return 0;
 168 }
 169
 170 /* Try to grab a lock on a mutex.  */
 171 static inline int
 172 __gthread_objc_mutex_trylock (objc_mutex_t mutex UNUSED)
 173 {
 174   /* There can only be one thread, so we always get the lock */
 175   return 0;
 176 }
 177
 178 /* Unlock the mutex */
 179 static inline int
 180 __gthread_objc_mutex_unlock (objc_mutex_t mutex UNUSED)
 181 {
 182   return 0;
 183 }
 184
 185 /* Backend condition mutex functions */
 186
 187 /* Allocate a condition.  */
 188 static inline int
 189 __gthread_objc_condition_allocate (objc_condition_t condition UNUSED)
 190 {
 191   return 0;
 192 }
 193
 194 /* Deallocate a condition.  */
 195 static inline int
 196 __gthread_objc_condition_deallocate (objc_condition_t condition UNUSED)
 197 {
 198   return 0;
 199 }
 200
 201 /* Wait on the condition */
 202 static inline int
 203 __gthread_objc_condition_wait (objc_condition_t condition UNUSED,
 204                                objc_mutex_t mutex UNUSED)
 205 {
 206   return 0;
 207 }
 208
 209 /* Wake up all threads waiting on this condition.  */
 210 static inline int
 211 __gthread_objc_condition_broadcast (objc_condition_t condition UNUSED)
 212 {
 213   return 0;
 214 }
 215
 216 /* Wake up one thread waiting on this condition.  */
 217 static inline int
 218 __gthread_objc_condition_signal (objc_condition_t condition UNUSED)
 219 {
 220   return 0;
 221 }
 222
 223 #else /* _LIBOBJC */
 224
 225 __GTHREAD_INLINE int
 226 __gthread_active_p (void)
 227 {
 228   return 0;
 229 }
 230
 231 __GTHREAD_INLINE int
 232 __gthread_once (__gthread_once_t *__once UNUSED, void (*__func) (void) UNUSED)
 233 {
 234   return 0;
 235 }
 236
 237 __GTHREAD_INLINE int UNUSED
 238 __gthread_key_create (__gthread_key_t *__key UNUSED, void (*__func) (void *) UNUSED)
 239 {
 240   return 0;
 241 }
 242
 243 __GTHREAD_INLINE int UNUSED
 244 __gthread_key_delete (__gthread_key_t __key UNUSED)
 245 {
 246   return 0;
 247 }
 248
 249 __GTHREAD_INLINE void *
 250 __gthread_getspecific (__gthread_key_t __key UNUSED)
 251 {
 252   return 0;
 253 }
 254
 255 __GTHREAD_INLINE int
 256 __gthread_setspecific (__gthread_key_t __key UNUSED, const void *__v UNUSED)
 257 {
 258   return 0;
 259 }
 260
 261 __GTHREAD_INLINE int
 262 __gthread_mutex_destroy (__gthread_mutex_t *__mutex UNUSED)
 263 {
 264   return 0;
 265 }
 266
 267 __GTHREAD_INLINE int
 268 __gthread_mutex_lock (__gthread_mutex_t *__mutex UNUSED)
 269 {
 270   return 0;
 271 }
 272
 273 __GTHREAD_INLINE int
 274 __gthread_mutex_trylock (__gthread_mutex_t *__mutex UNUSED)
 275 {
 276   return 0;
 277 }
 278
 279 __GTHREAD_INLINE int
 280 __gthread_mutex_unlock (__gthread_mutex_t *__mutex UNUSED)
 281 {
 282   return 0;
 283 }
 284
 285 __GTHREAD_INLINE int
 286 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
 287 {
 288   return __gthread_mutex_lock (__mutex);
 289 }
 290
 291 __GTHREAD_INLINE int
 292 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
 293 {
 294   return __gthread_mutex_trylock (__mutex);
 295 }
 296
 297 __GTHREAD_INLINE int
 298 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
 299 {
 300   return __gthread_mutex_unlock (__mutex);
 301 }
 302
 303 __GTHREAD_INLINE int
 304 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
 305 {
 306   return __gthread_mutex_destroy (__mutex);
 307 }
 308
 309 #endif /* _LIBOBJC */
 310
 311 #undef UNUSED
 312 #undef __GTHREAD_INLINE
 313 #undef __GTHREAD_ALWAYS_INLINE
 314
 315 #endif /* ! GCC_GTHR_SINGLE_H */