libgcc/gthr-single.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997-2023 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 #define UNUSED __attribute__((__unused__))
  42
  43 #ifdef _LIBOBJC
  44
  45 /* Thread local storage for a single thread */
  46 static void *thread_local_storage = NULL;
  47
  48 /* Backend initialization functions */
  49
  50 /* Initialize the threads subsystem.  */
  51 static inline int
  52 __gthread_objc_init_thread_system (void)
  53 {
  54   /* No thread support available */
  55   return -1;
  56 }
  57
  58 /* Close the threads subsystem.  */
  59 static inline int
  60 __gthread_objc_close_thread_system (void)
  61 {
  62   /* No thread support available */
  63   return -1;
  64 }
  65
  66 /* Backend thread functions */
  67
  68 /* Create a new thread of execution.  */
  69 static inline objc_thread_t
  70 __gthread_objc_thread_detach (void (* func)(void *), void * arg UNUSED)
  71 {
  72   /* No thread support available */
  73   return NULL;
  74 }
  75
  76 /* Set the current thread's priority.  */
  77 static inline int
  78 __gthread_objc_thread_set_priority (int priority UNUSED)
  79 {
  80   /* No thread support available */
  81   return -1;
  82 }
  83
  84 /* Return the current thread's priority.  */
  85 static inline int
  86 __gthread_objc_thread_get_priority (void)
  87 {
  88   return OBJC_THREAD_INTERACTIVE_PRIORITY;
  89 }
  90
  91 /* Yield our process time to another thread.  */
  92 static inline void
  93 __gthread_objc_thread_yield (void)
  94 {
  95   return;
  96 }
  97
  98 /* Terminate the current thread.  */
  99 static inline int
 100 __gthread_objc_thread_exit (void)
 101 {
 102   /* No thread support available */
 103   /* Should we really exit the program */
 104   /* exit (&__objc_thread_exit_status); */
 105   return -1;
 106 }
 107
 108 /* Returns an integer value which uniquely describes a thread.  */
 109 static inline objc_thread_t
 110 __gthread_objc_thread_id (void)
 111 {
 112   /* No thread support, use 1.  */
 113   return (objc_thread_t) 1;
 114 }
 115
 116 /* Sets the thread's local storage pointer.  */
 117 static inline int
 118 __gthread_objc_thread_set_data (void *value)
 119 {
 120   thread_local_storage = value;
 121   return 0;
 122 }
 123
 124 /* Returns the thread's local storage pointer.  */
 125 static inline void *
 126 __gthread_objc_thread_get_data (void)
 127 {
 128   return thread_local_storage;
 129 }
 130
 131 /* Backend mutex functions */
 132
 133 /* Allocate a mutex.  */
 134 static inline int
 135 __gthread_objc_mutex_allocate (objc_mutex_t mutex UNUSED)
 136 {
 137   return 0;
 138 }
 139
 140 /* Deallocate a mutex.  */
 141 static inline int
 142 __gthread_objc_mutex_deallocate (objc_mutex_t mutex UNUSED)
 143 {
 144   return 0;
 145 }
 146
 147 /* Grab a lock on a mutex.  */
 148 static inline int
 149 __gthread_objc_mutex_lock (objc_mutex_t mutex UNUSED)
 150 {
 151   /* There can only be one thread, so we always get the lock */
 152   return 0;
 153 }
 154
 155 /* Try to grab a lock on a mutex.  */
 156 static inline int
 157 __gthread_objc_mutex_trylock (objc_mutex_t mutex UNUSED)
 158 {
 159   /* There can only be one thread, so we always get the lock */
 160   return 0;
 161 }
 162
 163 /* Unlock the mutex */
 164 static inline int
 165 __gthread_objc_mutex_unlock (objc_mutex_t mutex UNUSED)
 166 {
 167   return 0;
 168 }
 169
 170 /* Backend condition mutex functions */
 171
 172 /* Allocate a condition.  */
 173 static inline int
 174 __gthread_objc_condition_allocate (objc_condition_t condition UNUSED)
 175 {
 176   return 0;
 177 }
 178
 179 /* Deallocate a condition.  */
 180 static inline int
 181 __gthread_objc_condition_deallocate (objc_condition_t condition UNUSED)
 182 {
 183   return 0;
 184 }
 185
 186 /* Wait on the condition */
 187 static inline int
 188 __gthread_objc_condition_wait (objc_condition_t condition UNUSED,
 189                                objc_mutex_t mutex UNUSED)
 190 {
 191   return 0;
 192 }
 193
 194 /* Wake up all threads waiting on this condition.  */
 195 static inline int
 196 __gthread_objc_condition_broadcast (objc_condition_t condition UNUSED)
 197 {
 198   return 0;
 199 }
 200
 201 /* Wake up one thread waiting on this condition.  */
 202 static inline int
 203 __gthread_objc_condition_signal (objc_condition_t condition UNUSED)
 204 {
 205   return 0;
 206 }
 207
 208 #else /* _LIBOBJC */
 209
 210 static inline int
 211 __gthread_active_p (void)
 212 {
 213   return 0;
 214 }
 215
 216 static inline int
 217 __gthread_once (__gthread_once_t *__once UNUSED, void (*__func) (void) UNUSED)
 218 {
 219   return 0;
 220 }
 221
 222 static inline int UNUSED
 223 __gthread_key_create (__gthread_key_t *__key UNUSED, void (*__func) (void *) UNUSED)
 224 {
 225   return 0;
 226 }
 227
 228 static int UNUSED
 229 __gthread_key_delete (__gthread_key_t __key UNUSED)
 230 {
 231   return 0;
 232 }
 233
 234 static inline void *
 235 __gthread_getspecific (__gthread_key_t __key UNUSED)
 236 {
 237   return 0;
 238 }
 239
 240 static inline int
 241 __gthread_setspecific (__gthread_key_t __key UNUSED, const void *__v UNUSED)
 242 {
 243   return 0;
 244 }
 245
 246 static inline int
 247 __gthread_mutex_destroy (__gthread_mutex_t *__mutex UNUSED)
 248 {
 249   return 0;
 250 }
 251
 252 static inline int
 253 __gthread_mutex_lock (__gthread_mutex_t *__mutex UNUSED)
 254 {
 255   return 0;
 256 }
 257
 258 static inline int
 259 __gthread_mutex_trylock (__gthread_mutex_t *__mutex UNUSED)
 260 {
 261   return 0;
 262 }
 263
 264 static inline int
 265 __gthread_mutex_unlock (__gthread_mutex_t *__mutex UNUSED)
 266 {
 267   return 0;
 268 }
 269
 270 static inline int
 271 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
 272 {
 273   return __gthread_mutex_lock (__mutex);
 274 }
 275
 276 static inline int
 277 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
 278 {
 279   return __gthread_mutex_trylock (__mutex);
 280 }
 281
 282 static inline int
 283 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
 284 {
 285   return __gthread_mutex_unlock (__mutex);
 286 }
 287
 288 static inline int
 289 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
 290 {
 291   return __gthread_mutex_destroy (__mutex);
 292 }
 293
 294 #endif /* _LIBOBJC */
 295
 296 #undef UNUSED
 297
 298 #endif /* ! GCC_GTHR_SINGLE_H */