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  1. /* Threads compatibility routines for libgcc2 and libobjc.  */
  2. /* Compile this one with gcc.  */
  3. /* Copyright (C) 1997-2013 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)
  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 */
  299.