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