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15794a95 | 1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
f24af81b | 2 | /* Compile this one with gcc. */ |
15794a95 | 3 | /* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc. |
f24af81b TT |
4 | |
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | /* As a special exception, if you link this library with other files, | |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. */ | |
28 | ||
29 | #ifndef __gthr_posix_h | |
30 | #define __gthr_posix_h | |
31 | ||
32 | /* POSIX threads specific definitions. | |
33 | Easy, since the interface is just one-to-one mapping. */ | |
34 | ||
35 | #define __GTHREADS 1 | |
36 | ||
37 | #include <pthread.h> | |
38 | ||
39 | typedef pthread_key_t __gthread_key_t; | |
40 | typedef pthread_once_t __gthread_once_t; | |
41 | typedef pthread_mutex_t __gthread_mutex_t; | |
42 | ||
43 | #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER | |
44 | #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT | |
45 | ||
46 | #if SUPPORTS_WEAK && GTHREAD_USE_WEAK | |
47 | ||
15794a95 L |
48 | #pragma weak pthread_once |
49 | #pragma weak pthread_key_create | |
50 | #pragma weak pthread_key_delete | |
51 | #pragma weak pthread_getspecific | |
52 | #pragma weak pthread_setspecific | |
53 | #pragma weak pthread_create | |
36244024 | 54 | |
15794a95 L |
55 | #pragma weak pthread_mutex_lock |
56 | #pragma weak pthread_mutex_trylock | |
57 | #pragma weak pthread_mutex_unlock | |
58 | ||
59 | #ifdef _LIBOBJC | |
60 | /* Objective C. */ | |
61 | #pragma weak pthread_cond_broadcast | |
62 | #pragma weak pthread_cond_destroy | |
63 | #pragma weak pthread_cond_init | |
64 | #pragma weak pthread_cond_signal | |
65 | #pragma weak pthread_cond_wait | |
66 | #pragma weak pthread_exit | |
67 | #pragma weak pthread_mutex_init | |
68 | #pragma weak pthread_mutex_destroy | |
69 | #pragma weak pthread_self | |
70 | #pragma weak sched_yield | |
71 | #endif | |
f24af81b TT |
72 | |
73 | static void *__gthread_active_ptr = &pthread_create; | |
74 | ||
75 | static inline int | |
d1e51320 | 76 | __gthread_active_p (void) |
f24af81b TT |
77 | { |
78 | return __gthread_active_ptr != 0; | |
79 | } | |
80 | ||
81 | #else /* not SUPPORTS_WEAK */ | |
82 | ||
83 | static inline int | |
d1e51320 | 84 | __gthread_active_p (void) |
f24af81b TT |
85 | { |
86 | return 1; | |
87 | } | |
88 | ||
89 | #endif /* SUPPORTS_WEAK */ | |
90 | ||
15794a95 L |
91 | #ifdef _LIBOBJC |
92 | ||
93 | /* Key structure for maintaining thread specific storage */ | |
94 | static pthread_key_t _objc_thread_storage; | |
95 | ||
96 | /* Thread local storage for a single thread */ | |
97 | static void *thread_local_storage = NULL; | |
98 | ||
99 | /* Backend initialization functions */ | |
100 | ||
101 | /* Initialize the threads subsystem. */ | |
102 | static inline int | |
103 | __gthread_objc_init_thread_system(void) | |
104 | { | |
105 | if (__gthread_active_p ()) | |
106 | /* Initialize the thread storage key */ | |
107 | return pthread_key_create(&_objc_thread_storage, NULL); | |
108 | else | |
109 | return -1; | |
110 | } | |
111 | ||
112 | /* Close the threads subsystem. */ | |
113 | static inline int | |
114 | __gthread_objc_close_thread_system(void) | |
115 | { | |
116 | if (__gthread_active_p ()) | |
117 | return 0; | |
118 | else | |
119 | return -1; | |
120 | } | |
121 | ||
122 | /* Backend thread functions */ | |
123 | ||
124 | /* Create a new thread of execution. */ | |
125 | static inline objc_thread_t | |
126 | __gthread_objc_thread_detach(void (*func)(void *), void *arg) | |
127 | { | |
128 | objc_thread_t thread_id; | |
129 | pthread_t new_thread_handle; | |
130 | ||
131 | if (!__gthread_active_p ()) | |
132 | return NULL; | |
133 | ||
134 | if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) ) | |
135 | thread_id = *(objc_thread_t *)&new_thread_handle; | |
136 | else | |
137 | thread_id = NULL; | |
138 | ||
139 | return thread_id; | |
140 | } | |
141 | ||
142 | /* Set the current thread's priority. */ | |
143 | static inline int | |
144 | __gthread_objc_thread_set_priority(int priority) | |
145 | { | |
146 | /* Not implemented yet */ | |
147 | return -1; | |
148 | } | |
149 | ||
150 | /* Return the current thread's priority. */ | |
151 | static inline int | |
152 | __gthread_objc_thread_get_priority(void) | |
153 | { | |
154 | if (__gthread_active_p ()) | |
155 | /* Not implemented yet */ | |
156 | return -1; | |
157 | else | |
158 | return OBJC_THREAD_INTERACTIVE_PRIORITY; | |
159 | } | |
160 | ||
161 | /* Yield our process time to another thread. */ | |
162 | static inline void | |
163 | __gthread_objc_thread_yield(void) | |
164 | { | |
165 | if (__gthread_active_p ()) | |
166 | sched_yield(); | |
167 | } | |
168 | ||
169 | /* Terminate the current thread. */ | |
170 | static inline int | |
171 | __gthread_objc_thread_exit(void) | |
172 | { | |
173 | if (__gthread_active_p ()) | |
174 | /* exit the thread */ | |
175 | pthread_exit(&__objc_thread_exit_status); | |
176 | ||
177 | /* Failed if we reached here */ | |
178 | return -1; | |
179 | } | |
180 | ||
181 | /* Returns an integer value which uniquely describes a thread. */ | |
182 | static inline objc_thread_t | |
183 | __gthread_objc_thread_id(void) | |
184 | { | |
185 | if (__gthread_active_p ()) | |
186 | { | |
187 | pthread_t self = pthread_self(); | |
188 | ||
189 | return *(objc_thread_t *)&self; | |
190 | } | |
191 | else | |
192 | return (objc_thread_t)1; | |
193 | } | |
194 | ||
195 | /* Sets the thread's local storage pointer. */ | |
196 | static inline int | |
197 | __gthread_objc_thread_set_data(void *value) | |
198 | { | |
199 | if (__gthread_active_p ()) | |
200 | return pthread_setspecific(_objc_thread_storage, value); | |
201 | else | |
202 | { | |
203 | thread_local_storage = value; | |
204 | return 0; | |
205 | } | |
206 | } | |
207 | ||
208 | /* Returns the thread's local storage pointer. */ | |
209 | static inline void * | |
210 | __gthread_objc_thread_get_data(void) | |
211 | { | |
212 | if (__gthread_active_p ()) | |
213 | return pthread_getspecific(_objc_thread_storage); | |
214 | else | |
215 | return thread_local_storage; | |
216 | } | |
217 | ||
218 | /* Backend mutex functions */ | |
219 | ||
220 | /* Allocate a mutex. */ | |
221 | static inline int | |
222 | __gthread_objc_mutex_allocate(objc_mutex_t mutex) | |
223 | { | |
224 | if (__gthread_active_p ()) | |
225 | { | |
226 | mutex->backend = objc_malloc(sizeof(pthread_mutex_t)); | |
227 | ||
228 | if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL)) | |
229 | { | |
230 | objc_free(mutex->backend); | |
231 | mutex->backend = NULL; | |
232 | return -1; | |
233 | } | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | /* Deallocate a mutex. */ | |
240 | static inline int | |
241 | __gthread_objc_mutex_deallocate(objc_mutex_t mutex) | |
242 | { | |
243 | if (__gthread_active_p ()) | |
244 | { | |
245 | int count; | |
246 | ||
247 | /* | |
248 | * Posix Threads specifically require that the thread be unlocked | |
249 | * for pthread_mutex_destroy to work. | |
250 | */ | |
251 | ||
252 | do | |
253 | { | |
254 | count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend); | |
255 | if (count < 0) | |
256 | return -1; | |
257 | } | |
258 | while (count); | |
259 | ||
260 | if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend)) | |
261 | return -1; | |
262 | ||
263 | objc_free(mutex->backend); | |
264 | mutex->backend = NULL; | |
265 | } | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /* Grab a lock on a mutex. */ | |
270 | static inline int | |
271 | __gthread_objc_mutex_lock(objc_mutex_t mutex) | |
272 | { | |
273 | if (__gthread_active_p ()) | |
274 | return pthread_mutex_lock((pthread_mutex_t *)mutex->backend); | |
275 | else | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /* Try to grab a lock on a mutex. */ | |
280 | static inline int | |
281 | __gthread_objc_mutex_trylock(objc_mutex_t mutex) | |
282 | { | |
283 | if (__gthread_active_p ()) | |
284 | return pthread_mutex_trylock((pthread_mutex_t *)mutex->backend); | |
285 | else | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* Unlock the mutex */ | |
290 | static inline int | |
291 | __gthread_objc_mutex_unlock(objc_mutex_t mutex) | |
292 | { | |
293 | if (__gthread_active_p ()) | |
294 | return pthread_mutex_unlock((pthread_mutex_t *)mutex->backend); | |
295 | else | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* Backend condition mutex functions */ | |
300 | ||
301 | /* Allocate a condition. */ | |
302 | static inline int | |
303 | __gthread_objc_condition_allocate(objc_condition_t condition) | |
304 | { | |
305 | if (__gthread_active_p ()) | |
306 | { | |
307 | condition->backend = objc_malloc(sizeof(pthread_cond_t)); | |
308 | ||
309 | if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL)) | |
310 | { | |
311 | objc_free(condition->backend); | |
312 | condition->backend = NULL; | |
313 | return -1; | |
314 | } | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | /* Deallocate a condition. */ | |
321 | static inline int | |
322 | __gthread_objc_condition_deallocate(objc_condition_t condition) | |
323 | { | |
324 | if (__gthread_active_p ()) | |
325 | { | |
326 | if (pthread_cond_destroy((pthread_cond_t *)condition->backend)) | |
327 | return -1; | |
328 | ||
329 | objc_free(condition->backend); | |
330 | condition->backend = NULL; | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* Wait on the condition */ | |
336 | static inline int | |
337 | __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) | |
338 | { | |
339 | if (__gthread_active_p ()) | |
340 | return pthread_cond_wait((pthread_cond_t *)condition->backend, | |
341 | (pthread_mutex_t *)mutex->backend); | |
342 | else | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* Wake up all threads waiting on this condition. */ | |
347 | static inline int | |
348 | __gthread_objc_condition_broadcast(objc_condition_t condition) | |
349 | { | |
350 | if (__gthread_active_p ()) | |
351 | return pthread_cond_broadcast((pthread_cond_t *)condition->backend); | |
352 | else | |
353 | return 0; | |
354 | } | |
355 | ||
356 | /* Wake up one thread waiting on this condition. */ | |
357 | static inline int | |
358 | __gthread_objc_condition_signal(objc_condition_t condition) | |
359 | { | |
360 | if (__gthread_active_p ()) | |
361 | return pthread_cond_signal((pthread_cond_t *)condition->backend); | |
362 | else | |
363 | return 0; | |
364 | } | |
365 | ||
366 | #else /* _LIBOBJC */ | |
367 | ||
f24af81b | 368 | static inline int |
d1e51320 | 369 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
f24af81b TT |
370 | { |
371 | if (__gthread_active_p ()) | |
372 | return pthread_once (once, func); | |
373 | else | |
374 | return -1; | |
375 | } | |
376 | ||
377 | static inline int | |
378 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
379 | { | |
380 | return pthread_key_create (key, dtor); | |
381 | } | |
382 | ||
383 | static inline int | |
384 | __gthread_key_dtor (__gthread_key_t key, void *ptr) | |
385 | { | |
386 | /* Just reset the key value to zero. */ | |
387 | if (ptr) | |
388 | return pthread_setspecific (key, 0); | |
389 | else | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static inline int | |
394 | __gthread_key_delete (__gthread_key_t key) | |
395 | { | |
396 | return pthread_key_delete (key); | |
397 | } | |
398 | ||
399 | static inline void * | |
400 | __gthread_getspecific (__gthread_key_t key) | |
401 | { | |
402 | return pthread_getspecific (key); | |
403 | } | |
404 | ||
405 | static inline int | |
406 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
407 | { | |
408 | return pthread_setspecific (key, ptr); | |
409 | } | |
410 | ||
411 | static inline int | |
412 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
413 | { | |
414 | if (__gthread_active_p ()) | |
415 | return pthread_mutex_lock (mutex); | |
416 | else | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static inline int | |
421 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
422 | { | |
423 | if (__gthread_active_p ()) | |
424 | return pthread_mutex_trylock (mutex); | |
425 | else | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static inline int | |
430 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
431 | { | |
432 | if (__gthread_active_p ()) | |
433 | return pthread_mutex_unlock (mutex); | |
434 | else | |
435 | return 0; | |
436 | } | |
437 | ||
15794a95 L |
438 | #endif /* _LIBOBJC */ |
439 | ||
f24af81b | 440 | #endif /* not __gthr_posix_h */ |