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15794a95 | 1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
f24af81b | 2 | /* Compile this one with gcc. */ |
fee013ef | 3 | /* Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc. |
f24af81b | 4 | |
1322177d | 5 | This file is part of GCC. |
f24af81b | 6 | |
1322177d LB |
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 2, or (at your option) any later | |
10 | version. | |
f24af81b | 11 | |
1322177d LB |
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. | |
f24af81b TT |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
f24af81b TT |
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 | ||
88657302 RH |
29 | #ifndef GCC_GTHR_POSIX_H |
30 | #define GCC_GTHR_POSIX_H | |
f24af81b TT |
31 | |
32 | /* POSIX threads specific definitions. | |
71287280 | 33 | Easy, since the interface is just one-to-one mapping. */ |
f24af81b TT |
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 | |
71287280 | 60 | /* Objective C. */ |
15794a95 L |
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 | |
f4b20cd9 RO |
70 | #pragma weak sched_get_priority_max |
71 | #pragma weak sched_get_priority_min | |
15794a95 | 72 | #pragma weak sched_yield |
6f9b26b0 LR |
73 | #pragma weak pthread_attr_destroy |
74 | #pragma weak pthread_attr_init | |
75 | #pragma weak pthread_attr_setdetachstate | |
76 | #pragma weak pthread_getschedparam | |
77 | #pragma weak pthread_setschedparam | |
15794a95 | 78 | #endif |
f24af81b | 79 | |
f24af81b | 80 | static inline int |
d1e51320 | 81 | __gthread_active_p (void) |
f24af81b | 82 | { |
7a8de19b | 83 | static void *const __gthread_active_ptr = (void *) &pthread_create; |
f24af81b TT |
84 | return __gthread_active_ptr != 0; |
85 | } | |
86 | ||
87 | #else /* not SUPPORTS_WEAK */ | |
88 | ||
89 | static inline int | |
d1e51320 | 90 | __gthread_active_p (void) |
f24af81b TT |
91 | { |
92 | return 1; | |
93 | } | |
94 | ||
95 | #endif /* SUPPORTS_WEAK */ | |
96 | ||
15794a95 L |
97 | #ifdef _LIBOBJC |
98 | ||
5f974826 OP |
99 | /* This is the config.h file in libobjc/ */ |
100 | #include <config.h> | |
101 | ||
102 | #ifdef HAVE_SCHED_H | |
103 | # include <sched.h> | |
104 | #endif | |
105 | ||
15794a95 L |
106 | /* Key structure for maintaining thread specific storage */ |
107 | static pthread_key_t _objc_thread_storage; | |
447c11a5 | 108 | static pthread_attr_t _objc_thread_attribs; |
15794a95 L |
109 | |
110 | /* Thread local storage for a single thread */ | |
111 | static void *thread_local_storage = NULL; | |
112 | ||
113 | /* Backend initialization functions */ | |
114 | ||
71287280 | 115 | /* Initialize the threads subsystem. */ |
15794a95 L |
116 | static inline int |
117 | __gthread_objc_init_thread_system(void) | |
118 | { | |
119 | if (__gthread_active_p ()) | |
447c11a5 OP |
120 | { |
121 | /* Initialize the thread storage key */ | |
122 | if (pthread_key_create(&_objc_thread_storage, NULL) == 0) | |
123 | { | |
124 | /* The normal default detach state for threads is | |
125 | * PTHREAD_CREATE_JOINABLE which causes threads to not die | |
126 | * when you think they should. */ | |
127 | if (pthread_attr_init(&_objc_thread_attribs) == 0 | |
128 | && pthread_attr_setdetachstate(&_objc_thread_attribs, | |
129 | PTHREAD_CREATE_DETACHED) == 0) | |
130 | return 0; | |
131 | } | |
132 | } | |
abc0360c NP |
133 | |
134 | return -1; | |
15794a95 L |
135 | } |
136 | ||
71287280 | 137 | /* Close the threads subsystem. */ |
15794a95 L |
138 | static inline int |
139 | __gthread_objc_close_thread_system(void) | |
140 | { | |
447c11a5 OP |
141 | if (__gthread_active_p () |
142 | && pthread_key_delete(_objc_thread_storage) == 0 | |
143 | && pthread_attr_destroy(&_objc_thread_attribs) == 0) | |
15794a95 | 144 | return 0; |
447c11a5 OP |
145 | |
146 | return -1; | |
15794a95 L |
147 | } |
148 | ||
149 | /* Backend thread functions */ | |
150 | ||
71287280 | 151 | /* Create a new thread of execution. */ |
15794a95 L |
152 | static inline objc_thread_t |
153 | __gthread_objc_thread_detach(void (*func)(void *), void *arg) | |
154 | { | |
155 | objc_thread_t thread_id; | |
156 | pthread_t new_thread_handle; | |
157 | ||
158 | if (!__gthread_active_p ()) | |
159 | return NULL; | |
160 | ||
161 | if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) ) | |
fee013ef | 162 | thread_id = (objc_thread_t) new_thread_handle; |
15794a95 L |
163 | else |
164 | thread_id = NULL; | |
165 | ||
166 | return thread_id; | |
167 | } | |
168 | ||
71287280 | 169 | /* Set the current thread's priority. */ |
15794a95 L |
170 | static inline int |
171 | __gthread_objc_thread_set_priority(int priority) | |
172 | { | |
447c11a5 OP |
173 | if (!__gthread_active_p()) |
174 | return -1; | |
175 | else { | |
176 | pthread_t thread_id = pthread_self(); | |
177 | int policy; | |
178 | struct sched_param params; | |
179 | int priority_min, priority_max; | |
180 | ||
181 | if (pthread_getschedparam(thread_id, &policy, ¶ms) == 0) | |
182 | { | |
183 | if ((priority_max = sched_get_priority_max(policy)) != 0) | |
184 | return -1; | |
185 | ||
186 | if ((priority_min = sched_get_priority_min(policy)) != 0) | |
187 | return -1; | |
188 | ||
189 | if (priority > priority_max) | |
190 | priority = priority_max; | |
191 | else if (priority < priority_min) | |
192 | priority = priority_min; | |
193 | params.sched_priority = priority; | |
194 | ||
195 | /* | |
196 | * The solaris 7 and several other man pages incorrectly state that | |
197 | * this should be a pointer to policy but pthread.h is universally | |
198 | * at odds with this. | |
199 | */ | |
200 | if (pthread_setschedparam(thread_id, policy, ¶ms) == 0) | |
201 | return 0; | |
202 | } | |
203 | return -1; | |
204 | } | |
15794a95 L |
205 | } |
206 | ||
71287280 | 207 | /* Return the current thread's priority. */ |
15794a95 L |
208 | static inline int |
209 | __gthread_objc_thread_get_priority(void) | |
210 | { | |
211 | if (__gthread_active_p ()) | |
447c11a5 OP |
212 | { |
213 | int policy; | |
214 | struct sched_param params; | |
215 | ||
216 | if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0) | |
217 | return params.sched_priority; | |
218 | else | |
219 | return -1; | |
220 | } | |
15794a95 L |
221 | else |
222 | return OBJC_THREAD_INTERACTIVE_PRIORITY; | |
223 | } | |
224 | ||
71287280 | 225 | /* Yield our process time to another thread. */ |
15794a95 L |
226 | static inline void |
227 | __gthread_objc_thread_yield(void) | |
228 | { | |
229 | if (__gthread_active_p ()) | |
230 | sched_yield(); | |
231 | } | |
232 | ||
71287280 | 233 | /* Terminate the current thread. */ |
15794a95 L |
234 | static inline int |
235 | __gthread_objc_thread_exit(void) | |
236 | { | |
237 | if (__gthread_active_p ()) | |
238 | /* exit the thread */ | |
239 | pthread_exit(&__objc_thread_exit_status); | |
240 | ||
241 | /* Failed if we reached here */ | |
242 | return -1; | |
243 | } | |
244 | ||
71287280 | 245 | /* Returns an integer value which uniquely describes a thread. */ |
15794a95 L |
246 | static inline objc_thread_t |
247 | __gthread_objc_thread_id(void) | |
248 | { | |
249 | if (__gthread_active_p ()) | |
fee013ef | 250 | return (objc_thread_t) pthread_self(); |
15794a95 | 251 | else |
fee013ef | 252 | return (objc_thread_t) 1; |
15794a95 L |
253 | } |
254 | ||
71287280 | 255 | /* Sets the thread's local storage pointer. */ |
15794a95 L |
256 | static inline int |
257 | __gthread_objc_thread_set_data(void *value) | |
258 | { | |
259 | if (__gthread_active_p ()) | |
260 | return pthread_setspecific(_objc_thread_storage, value); | |
261 | else | |
262 | { | |
263 | thread_local_storage = value; | |
264 | return 0; | |
265 | } | |
266 | } | |
267 | ||
71287280 | 268 | /* Returns the thread's local storage pointer. */ |
15794a95 L |
269 | static inline void * |
270 | __gthread_objc_thread_get_data(void) | |
271 | { | |
272 | if (__gthread_active_p ()) | |
273 | return pthread_getspecific(_objc_thread_storage); | |
274 | else | |
275 | return thread_local_storage; | |
276 | } | |
277 | ||
278 | /* Backend mutex functions */ | |
279 | ||
71287280 | 280 | /* Allocate a mutex. */ |
15794a95 L |
281 | static inline int |
282 | __gthread_objc_mutex_allocate(objc_mutex_t mutex) | |
283 | { | |
284 | if (__gthread_active_p ()) | |
285 | { | |
286 | mutex->backend = objc_malloc(sizeof(pthread_mutex_t)); | |
287 | ||
288 | if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL)) | |
289 | { | |
290 | objc_free(mutex->backend); | |
291 | mutex->backend = NULL; | |
292 | return -1; | |
293 | } | |
294 | } | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
71287280 | 299 | /* Deallocate a mutex. */ |
15794a95 L |
300 | static inline int |
301 | __gthread_objc_mutex_deallocate(objc_mutex_t mutex) | |
302 | { | |
303 | if (__gthread_active_p ()) | |
304 | { | |
305 | int count; | |
306 | ||
307 | /* | |
308 | * Posix Threads specifically require that the thread be unlocked | |
309 | * for pthread_mutex_destroy to work. | |
310 | */ | |
311 | ||
312 | do | |
313 | { | |
314 | count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend); | |
315 | if (count < 0) | |
316 | return -1; | |
317 | } | |
318 | while (count); | |
319 | ||
320 | if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend)) | |
321 | return -1; | |
322 | ||
323 | objc_free(mutex->backend); | |
324 | mutex->backend = NULL; | |
325 | } | |
326 | return 0; | |
327 | } | |
328 | ||
71287280 | 329 | /* Grab a lock on a mutex. */ |
15794a95 L |
330 | static inline int |
331 | __gthread_objc_mutex_lock(objc_mutex_t mutex) | |
332 | { | |
054af139 NP |
333 | if (__gthread_active_p () |
334 | && pthread_mutex_lock((pthread_mutex_t *)mutex->backend) != 0) | |
335 | { | |
336 | return -1; | |
337 | } | |
338 | ||
339 | return 0; | |
15794a95 L |
340 | } |
341 | ||
71287280 | 342 | /* Try to grab a lock on a mutex. */ |
15794a95 L |
343 | static inline int |
344 | __gthread_objc_mutex_trylock(objc_mutex_t mutex) | |
345 | { | |
054af139 NP |
346 | if (__gthread_active_p () |
347 | && pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) != 0) | |
348 | { | |
349 | return -1; | |
350 | } | |
351 | ||
352 | return 0; | |
15794a95 L |
353 | } |
354 | ||
355 | /* Unlock the mutex */ | |
356 | static inline int | |
357 | __gthread_objc_mutex_unlock(objc_mutex_t mutex) | |
358 | { | |
054af139 NP |
359 | if (__gthread_active_p () |
360 | && pthread_mutex_unlock((pthread_mutex_t *)mutex->backend) != 0) | |
361 | { | |
362 | return -1; | |
363 | } | |
364 | ||
365 | return 0; | |
15794a95 L |
366 | } |
367 | ||
368 | /* Backend condition mutex functions */ | |
369 | ||
71287280 | 370 | /* Allocate a condition. */ |
15794a95 L |
371 | static inline int |
372 | __gthread_objc_condition_allocate(objc_condition_t condition) | |
373 | { | |
374 | if (__gthread_active_p ()) | |
375 | { | |
376 | condition->backend = objc_malloc(sizeof(pthread_cond_t)); | |
377 | ||
378 | if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL)) | |
379 | { | |
380 | objc_free(condition->backend); | |
381 | condition->backend = NULL; | |
382 | return -1; | |
383 | } | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
71287280 | 389 | /* Deallocate a condition. */ |
15794a95 L |
390 | static inline int |
391 | __gthread_objc_condition_deallocate(objc_condition_t condition) | |
392 | { | |
393 | if (__gthread_active_p ()) | |
394 | { | |
395 | if (pthread_cond_destroy((pthread_cond_t *)condition->backend)) | |
396 | return -1; | |
397 | ||
398 | objc_free(condition->backend); | |
399 | condition->backend = NULL; | |
400 | } | |
401 | return 0; | |
402 | } | |
403 | ||
404 | /* Wait on the condition */ | |
405 | static inline int | |
406 | __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) | |
407 | { | |
408 | if (__gthread_active_p ()) | |
409 | return pthread_cond_wait((pthread_cond_t *)condition->backend, | |
410 | (pthread_mutex_t *)mutex->backend); | |
411 | else | |
412 | return 0; | |
413 | } | |
414 | ||
71287280 | 415 | /* Wake up all threads waiting on this condition. */ |
15794a95 L |
416 | static inline int |
417 | __gthread_objc_condition_broadcast(objc_condition_t condition) | |
418 | { | |
419 | if (__gthread_active_p ()) | |
420 | return pthread_cond_broadcast((pthread_cond_t *)condition->backend); | |
421 | else | |
422 | return 0; | |
423 | } | |
424 | ||
71287280 | 425 | /* Wake up one thread waiting on this condition. */ |
15794a95 L |
426 | static inline int |
427 | __gthread_objc_condition_signal(objc_condition_t condition) | |
428 | { | |
429 | if (__gthread_active_p ()) | |
430 | return pthread_cond_signal((pthread_cond_t *)condition->backend); | |
431 | else | |
432 | return 0; | |
433 | } | |
434 | ||
435 | #else /* _LIBOBJC */ | |
436 | ||
f24af81b | 437 | static inline int |
d1e51320 | 438 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
f24af81b TT |
439 | { |
440 | if (__gthread_active_p ()) | |
441 | return pthread_once (once, func); | |
442 | else | |
443 | return -1; | |
444 | } | |
445 | ||
446 | static inline int | |
447 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
448 | { | |
449 | return pthread_key_create (key, dtor); | |
450 | } | |
451 | ||
452 | static inline int | |
453 | __gthread_key_dtor (__gthread_key_t key, void *ptr) | |
454 | { | |
71287280 | 455 | /* Just reset the key value to zero. */ |
f24af81b TT |
456 | if (ptr) |
457 | return pthread_setspecific (key, 0); | |
458 | else | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static inline int | |
463 | __gthread_key_delete (__gthread_key_t key) | |
464 | { | |
465 | return pthread_key_delete (key); | |
466 | } | |
467 | ||
468 | static inline void * | |
469 | __gthread_getspecific (__gthread_key_t key) | |
470 | { | |
471 | return pthread_getspecific (key); | |
472 | } | |
473 | ||
474 | static inline int | |
475 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
476 | { | |
477 | return pthread_setspecific (key, ptr); | |
478 | } | |
479 | ||
480 | static inline int | |
481 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
482 | { | |
483 | if (__gthread_active_p ()) | |
484 | return pthread_mutex_lock (mutex); | |
485 | else | |
486 | return 0; | |
487 | } | |
488 | ||
489 | static inline int | |
490 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
491 | { | |
492 | if (__gthread_active_p ()) | |
493 | return pthread_mutex_trylock (mutex); | |
494 | else | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static inline int | |
499 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
500 | { | |
501 | if (__gthread_active_p ()) | |
502 | return pthread_mutex_unlock (mutex); | |
503 | else | |
504 | return 0; | |
505 | } | |
506 | ||
15794a95 L |
507 | #endif /* _LIBOBJC */ |
508 | ||
88657302 | 509 | #endif /* ! GCC_GTHR_POSIX_H */ |