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15794a95 | 1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
f24af81b | 2 | /* Compile this one with gcc. */ |
2a4e8ebc RO |
3 | /* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003 |
4 | Free Software Foundation, Inc. | |
f24af81b | 5 | |
1322177d | 6 | This file is part of GCC. |
f24af81b | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
f24af81b | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
f24af81b TT |
17 | |
18 | You should have received a copy of the GNU General Public License | |
1322177d LB |
19 | along with GCC; see the file COPYING. If not, write to the Free |
20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
21 | 02111-1307, USA. */ | |
f24af81b TT |
22 | |
23 | /* As a special exception, if you link this library with other files, | |
24 | some of which are compiled with GCC, to produce an executable, | |
25 | this library does not by itself cause the resulting executable | |
26 | to be covered by the GNU General Public License. | |
27 | This exception does not however invalidate any other reasons why | |
28 | the executable file might be covered by the GNU General Public License. */ | |
29 | ||
88657302 RH |
30 | #ifndef GCC_GTHR_POSIX_H |
31 | #define GCC_GTHR_POSIX_H | |
f24af81b TT |
32 | |
33 | /* POSIX threads specific definitions. | |
71287280 | 34 | Easy, since the interface is just one-to-one mapping. */ |
f24af81b TT |
35 | |
36 | #define __GTHREADS 1 | |
37 | ||
2a4e8ebc RO |
38 | /* Some implementations of <pthread.h> require this to be defined. */ |
39 | #ifndef _REENTRANT | |
40 | #define _REENTRANT 1 | |
41 | #endif | |
42 | ||
f24af81b | 43 | #include <pthread.h> |
c95d07f8 | 44 | #include <unistd.h> |
f24af81b TT |
45 | |
46 | typedef pthread_key_t __gthread_key_t; | |
47 | typedef pthread_once_t __gthread_once_t; | |
48 | typedef pthread_mutex_t __gthread_mutex_t; | |
49 | ||
50 | #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER | |
51 | #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT | |
52 | ||
53 | #if SUPPORTS_WEAK && GTHREAD_USE_WEAK | |
54 | ||
15794a95 L |
55 | #pragma weak pthread_once |
56 | #pragma weak pthread_key_create | |
57 | #pragma weak pthread_key_delete | |
58 | #pragma weak pthread_getspecific | |
59 | #pragma weak pthread_setspecific | |
60 | #pragma weak pthread_create | |
36244024 | 61 | |
589005ff KH |
62 | #pragma weak pthread_mutex_lock |
63 | #pragma weak pthread_mutex_trylock | |
64 | #pragma weak pthread_mutex_unlock | |
15794a95 | 65 | |
2a4e8ebc | 66 | #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK) |
40f03658 | 67 | /* Objective-C. */ |
15794a95 L |
68 | #pragma weak pthread_cond_broadcast |
69 | #pragma weak pthread_cond_destroy | |
70 | #pragma weak pthread_cond_init | |
71 | #pragma weak pthread_cond_signal | |
72 | #pragma weak pthread_cond_wait | |
73 | #pragma weak pthread_exit | |
74 | #pragma weak pthread_mutex_init | |
75 | #pragma weak pthread_mutex_destroy | |
76 | #pragma weak pthread_self | |
45863ba3 | 77 | #ifdef _POSIX_PRIORITY_SCHEDULING |
c95d07f8 | 78 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
f4b20cd9 RO |
79 | #pragma weak sched_get_priority_max |
80 | #pragma weak sched_get_priority_min | |
c95d07f8 | 81 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
45863ba3 | 82 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
15794a95 | 83 | #pragma weak sched_yield |
6f9b26b0 LR |
84 | #pragma weak pthread_attr_destroy |
85 | #pragma weak pthread_attr_init | |
86 | #pragma weak pthread_attr_setdetachstate | |
c95d07f8 | 87 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
6f9b26b0 LR |
88 | #pragma weak pthread_getschedparam |
89 | #pragma weak pthread_setschedparam | |
c95d07f8 | 90 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
2a4e8ebc | 91 | #endif /* _LIBOBJC || _LIBOBJC_WEAK */ |
f24af81b | 92 | |
f24af81b | 93 | static inline int |
d1e51320 | 94 | __gthread_active_p (void) |
f24af81b | 95 | { |
7a8de19b | 96 | static void *const __gthread_active_ptr = (void *) &pthread_create; |
f24af81b TT |
97 | return __gthread_active_ptr != 0; |
98 | } | |
99 | ||
100 | #else /* not SUPPORTS_WEAK */ | |
101 | ||
102 | static inline int | |
d1e51320 | 103 | __gthread_active_p (void) |
f24af81b TT |
104 | { |
105 | return 1; | |
106 | } | |
107 | ||
108 | #endif /* SUPPORTS_WEAK */ | |
109 | ||
15794a95 L |
110 | #ifdef _LIBOBJC |
111 | ||
5f974826 OP |
112 | /* This is the config.h file in libobjc/ */ |
113 | #include <config.h> | |
114 | ||
115 | #ifdef HAVE_SCHED_H | |
116 | # include <sched.h> | |
117 | #endif | |
118 | ||
15794a95 L |
119 | /* Key structure for maintaining thread specific storage */ |
120 | static pthread_key_t _objc_thread_storage; | |
447c11a5 | 121 | static pthread_attr_t _objc_thread_attribs; |
15794a95 L |
122 | |
123 | /* Thread local storage for a single thread */ | |
124 | static void *thread_local_storage = NULL; | |
125 | ||
126 | /* Backend initialization functions */ | |
127 | ||
71287280 | 128 | /* Initialize the threads subsystem. */ |
15794a95 | 129 | static inline int |
fe83a9ce | 130 | __gthread_objc_init_thread_system (void) |
15794a95 L |
131 | { |
132 | if (__gthread_active_p ()) | |
447c11a5 OP |
133 | { |
134 | /* Initialize the thread storage key */ | |
fe83a9ce | 135 | if (pthread_key_create (&_objc_thread_storage, NULL) == 0) |
589005ff KH |
136 | { |
137 | /* The normal default detach state for threads is | |
138 | * PTHREAD_CREATE_JOINABLE which causes threads to not die | |
139 | * when you think they should. */ | |
fe83a9ce KH |
140 | if (pthread_attr_init (&_objc_thread_attribs) == 0 |
141 | && pthread_attr_setdetachstate (&_objc_thread_attribs, | |
142 | PTHREAD_CREATE_DETACHED) == 0) | |
589005ff KH |
143 | return 0; |
144 | } | |
447c11a5 | 145 | } |
abc0360c NP |
146 | |
147 | return -1; | |
15794a95 L |
148 | } |
149 | ||
71287280 | 150 | /* Close the threads subsystem. */ |
15794a95 | 151 | static inline int |
fe83a9ce | 152 | __gthread_objc_close_thread_system (void) |
15794a95 | 153 | { |
447c11a5 | 154 | if (__gthread_active_p () |
fe83a9ce KH |
155 | && pthread_key_delete (_objc_thread_storage) == 0 |
156 | && pthread_attr_destroy (&_objc_thread_attribs) == 0) | |
15794a95 | 157 | return 0; |
447c11a5 OP |
158 | |
159 | return -1; | |
15794a95 L |
160 | } |
161 | ||
162 | /* Backend thread functions */ | |
163 | ||
71287280 | 164 | /* Create a new thread of execution. */ |
15794a95 | 165 | static inline objc_thread_t |
fe83a9ce | 166 | __gthread_objc_thread_detach (void (*func)(void *), void *arg) |
15794a95 L |
167 | { |
168 | objc_thread_t thread_id; | |
169 | pthread_t new_thread_handle; | |
170 | ||
171 | if (!__gthread_active_p ()) | |
172 | return NULL; | |
589005ff | 173 | |
fe83a9ce | 174 | if (!(pthread_create (&new_thread_handle, NULL, (void *) func, arg))) |
fee013ef | 175 | thread_id = (objc_thread_t) new_thread_handle; |
15794a95 L |
176 | else |
177 | thread_id = NULL; | |
589005ff | 178 | |
15794a95 L |
179 | return thread_id; |
180 | } | |
181 | ||
71287280 | 182 | /* Set the current thread's priority. */ |
15794a95 | 183 | static inline int |
fe83a9ce | 184 | __gthread_objc_thread_set_priority (int priority) |
15794a95 | 185 | { |
fe83a9ce | 186 | if (!__gthread_active_p ()) |
447c11a5 | 187 | return -1; |
fe83a9ce KH |
188 | else |
189 | { | |
45863ba3 | 190 | #ifdef _POSIX_PRIORITY_SCHEDULING |
c95d07f8 | 191 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
fe83a9ce KH |
192 | pthread_t thread_id = pthread_self (); |
193 | int policy; | |
194 | struct sched_param params; | |
195 | int priority_min, priority_max; | |
589005ff | 196 | |
fe83a9ce KH |
197 | if (pthread_getschedparam (thread_id, &policy, ¶ms) == 0) |
198 | { | |
199 | if ((priority_max = sched_get_priority_max (policy)) == -1) | |
200 | return -1; | |
201 | ||
202 | if ((priority_min = sched_get_priority_min (policy)) == -1) | |
203 | return -1; | |
589005ff | 204 | |
fe83a9ce KH |
205 | if (priority > priority_max) |
206 | priority = priority_max; | |
207 | else if (priority < priority_min) | |
208 | priority = priority_min; | |
209 | params.sched_priority = priority; | |
210 | ||
211 | /* | |
212 | * The solaris 7 and several other man pages incorrectly state that | |
213 | * this should be a pointer to policy but pthread.h is universally | |
214 | * at odds with this. | |
215 | */ | |
216 | if (pthread_setschedparam (thread_id, policy, ¶ms) == 0) | |
217 | return 0; | |
218 | } | |
c95d07f8 | 219 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
45863ba3 | 220 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
fe83a9ce KH |
221 | return -1; |
222 | } | |
15794a95 L |
223 | } |
224 | ||
71287280 | 225 | /* Return the current thread's priority. */ |
15794a95 | 226 | static inline int |
fe83a9ce | 227 | __gthread_objc_thread_get_priority (void) |
15794a95 | 228 | { |
45863ba3 | 229 | #ifdef _POSIX_PRIORITY_SCHEDULING |
c95d07f8 | 230 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
15794a95 | 231 | if (__gthread_active_p ()) |
447c11a5 OP |
232 | { |
233 | int policy; | |
234 | struct sched_param params; | |
235 | ||
fe83a9ce | 236 | if (pthread_getschedparam (pthread_self (), &policy, ¶ms) == 0) |
589005ff | 237 | return params.sched_priority; |
447c11a5 | 238 | else |
589005ff | 239 | return -1; |
447c11a5 | 240 | } |
15794a95 | 241 | else |
c95d07f8 | 242 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
45863ba3 | 243 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
15794a95 L |
244 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
245 | } | |
246 | ||
71287280 | 247 | /* Yield our process time to another thread. */ |
15794a95 | 248 | static inline void |
fe83a9ce | 249 | __gthread_objc_thread_yield (void) |
15794a95 L |
250 | { |
251 | if (__gthread_active_p ()) | |
fe83a9ce | 252 | sched_yield (); |
15794a95 L |
253 | } |
254 | ||
71287280 | 255 | /* Terminate the current thread. */ |
15794a95 | 256 | static inline int |
fe83a9ce | 257 | __gthread_objc_thread_exit (void) |
15794a95 L |
258 | { |
259 | if (__gthread_active_p ()) | |
260 | /* exit the thread */ | |
fe83a9ce | 261 | pthread_exit (&__objc_thread_exit_status); |
15794a95 L |
262 | |
263 | /* Failed if we reached here */ | |
264 | return -1; | |
265 | } | |
266 | ||
71287280 | 267 | /* Returns an integer value which uniquely describes a thread. */ |
15794a95 | 268 | static inline objc_thread_t |
fe83a9ce | 269 | __gthread_objc_thread_id (void) |
15794a95 L |
270 | { |
271 | if (__gthread_active_p ()) | |
fe83a9ce | 272 | return (objc_thread_t) pthread_self (); |
15794a95 | 273 | else |
fee013ef | 274 | return (objc_thread_t) 1; |
15794a95 L |
275 | } |
276 | ||
71287280 | 277 | /* Sets the thread's local storage pointer. */ |
15794a95 | 278 | static inline int |
fe83a9ce | 279 | __gthread_objc_thread_set_data (void *value) |
15794a95 L |
280 | { |
281 | if (__gthread_active_p ()) | |
fe83a9ce | 282 | return pthread_setspecific (_objc_thread_storage, value); |
15794a95 L |
283 | else |
284 | { | |
285 | thread_local_storage = value; | |
286 | return 0; | |
287 | } | |
288 | } | |
289 | ||
71287280 | 290 | /* Returns the thread's local storage pointer. */ |
15794a95 | 291 | static inline void * |
fe83a9ce | 292 | __gthread_objc_thread_get_data (void) |
15794a95 L |
293 | { |
294 | if (__gthread_active_p ()) | |
fe83a9ce | 295 | return pthread_getspecific (_objc_thread_storage); |
15794a95 L |
296 | else |
297 | return thread_local_storage; | |
298 | } | |
299 | ||
300 | /* Backend mutex functions */ | |
301 | ||
71287280 | 302 | /* Allocate a mutex. */ |
15794a95 | 303 | static inline int |
fe83a9ce | 304 | __gthread_objc_mutex_allocate (objc_mutex_t mutex) |
15794a95 L |
305 | { |
306 | if (__gthread_active_p ()) | |
307 | { | |
fe83a9ce | 308 | mutex->backend = objc_malloc (sizeof (pthread_mutex_t)); |
15794a95 | 309 | |
fe83a9ce | 310 | if (pthread_mutex_init ((pthread_mutex_t *) mutex->backend, NULL)) |
15794a95 | 311 | { |
fe83a9ce | 312 | objc_free (mutex->backend); |
15794a95 L |
313 | mutex->backend = NULL; |
314 | return -1; | |
315 | } | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
71287280 | 321 | /* Deallocate a mutex. */ |
15794a95 | 322 | static inline int |
fe83a9ce | 323 | __gthread_objc_mutex_deallocate (objc_mutex_t mutex) |
15794a95 L |
324 | { |
325 | if (__gthread_active_p ()) | |
326 | { | |
327 | int count; | |
328 | ||
329 | /* | |
330 | * Posix Threads specifically require that the thread be unlocked | |
331 | * for pthread_mutex_destroy to work. | |
332 | */ | |
333 | ||
334 | do | |
335 | { | |
fe83a9ce | 336 | count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend); |
15794a95 L |
337 | if (count < 0) |
338 | return -1; | |
339 | } | |
340 | while (count); | |
341 | ||
fe83a9ce | 342 | if (pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend)) |
15794a95 L |
343 | return -1; |
344 | ||
fe83a9ce | 345 | objc_free (mutex->backend); |
15794a95 L |
346 | mutex->backend = NULL; |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
71287280 | 351 | /* Grab a lock on a mutex. */ |
15794a95 | 352 | static inline int |
fe83a9ce | 353 | __gthread_objc_mutex_lock (objc_mutex_t mutex) |
15794a95 | 354 | { |
589005ff | 355 | if (__gthread_active_p () |
fe83a9ce | 356 | && pthread_mutex_lock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
357 | { |
358 | return -1; | |
359 | } | |
360 | ||
361 | return 0; | |
15794a95 L |
362 | } |
363 | ||
71287280 | 364 | /* Try to grab a lock on a mutex. */ |
15794a95 | 365 | static inline int |
fe83a9ce | 366 | __gthread_objc_mutex_trylock (objc_mutex_t mutex) |
15794a95 | 367 | { |
589005ff | 368 | if (__gthread_active_p () |
fe83a9ce | 369 | && pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
370 | { |
371 | return -1; | |
372 | } | |
373 | ||
374 | return 0; | |
15794a95 L |
375 | } |
376 | ||
377 | /* Unlock the mutex */ | |
378 | static inline int | |
fe83a9ce | 379 | __gthread_objc_mutex_unlock (objc_mutex_t mutex) |
15794a95 | 380 | { |
589005ff | 381 | if (__gthread_active_p () |
fe83a9ce | 382 | && pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
383 | { |
384 | return -1; | |
385 | } | |
386 | ||
387 | return 0; | |
15794a95 L |
388 | } |
389 | ||
390 | /* Backend condition mutex functions */ | |
391 | ||
71287280 | 392 | /* Allocate a condition. */ |
15794a95 | 393 | static inline int |
fe83a9ce | 394 | __gthread_objc_condition_allocate (objc_condition_t condition) |
15794a95 L |
395 | { |
396 | if (__gthread_active_p ()) | |
397 | { | |
fe83a9ce | 398 | condition->backend = objc_malloc (sizeof (pthread_cond_t)); |
15794a95 | 399 | |
fe83a9ce | 400 | if (pthread_cond_init ((pthread_cond_t *) condition->backend, NULL)) |
15794a95 | 401 | { |
fe83a9ce | 402 | objc_free (condition->backend); |
15794a95 L |
403 | condition->backend = NULL; |
404 | return -1; | |
405 | } | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
71287280 | 411 | /* Deallocate a condition. */ |
15794a95 | 412 | static inline int |
fe83a9ce | 413 | __gthread_objc_condition_deallocate (objc_condition_t condition) |
15794a95 L |
414 | { |
415 | if (__gthread_active_p ()) | |
416 | { | |
fe83a9ce | 417 | if (pthread_cond_destroy ((pthread_cond_t *) condition->backend)) |
15794a95 L |
418 | return -1; |
419 | ||
fe83a9ce | 420 | objc_free (condition->backend); |
15794a95 L |
421 | condition->backend = NULL; |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | /* Wait on the condition */ | |
427 | static inline int | |
fe83a9ce | 428 | __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) |
15794a95 L |
429 | { |
430 | if (__gthread_active_p ()) | |
fe83a9ce KH |
431 | return pthread_cond_wait ((pthread_cond_t *) condition->backend, |
432 | (pthread_mutex_t *) mutex->backend); | |
15794a95 L |
433 | else |
434 | return 0; | |
435 | } | |
436 | ||
71287280 | 437 | /* Wake up all threads waiting on this condition. */ |
15794a95 | 438 | static inline int |
fe83a9ce | 439 | __gthread_objc_condition_broadcast (objc_condition_t condition) |
15794a95 L |
440 | { |
441 | if (__gthread_active_p ()) | |
fe83a9ce | 442 | return pthread_cond_broadcast ((pthread_cond_t *) condition->backend); |
15794a95 L |
443 | else |
444 | return 0; | |
445 | } | |
446 | ||
71287280 | 447 | /* Wake up one thread waiting on this condition. */ |
15794a95 | 448 | static inline int |
fe83a9ce | 449 | __gthread_objc_condition_signal (objc_condition_t condition) |
15794a95 L |
450 | { |
451 | if (__gthread_active_p ()) | |
fe83a9ce | 452 | return pthread_cond_signal ((pthread_cond_t *) condition->backend); |
15794a95 L |
453 | else |
454 | return 0; | |
455 | } | |
456 | ||
457 | #else /* _LIBOBJC */ | |
458 | ||
f24af81b | 459 | static inline int |
d1e51320 | 460 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
f24af81b TT |
461 | { |
462 | if (__gthread_active_p ()) | |
463 | return pthread_once (once, func); | |
464 | else | |
465 | return -1; | |
466 | } | |
467 | ||
468 | static inline int | |
469 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
470 | { | |
471 | return pthread_key_create (key, dtor); | |
472 | } | |
473 | ||
f24af81b TT |
474 | static inline int |
475 | __gthread_key_delete (__gthread_key_t key) | |
476 | { | |
477 | return pthread_key_delete (key); | |
478 | } | |
479 | ||
480 | static inline void * | |
481 | __gthread_getspecific (__gthread_key_t key) | |
482 | { | |
483 | return pthread_getspecific (key); | |
484 | } | |
485 | ||
486 | static inline int | |
487 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
488 | { | |
489 | return pthread_setspecific (key, ptr); | |
490 | } | |
491 | ||
492 | static inline int | |
493 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
494 | { | |
495 | if (__gthread_active_p ()) | |
496 | return pthread_mutex_lock (mutex); | |
497 | else | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static inline int | |
502 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
503 | { | |
504 | if (__gthread_active_p ()) | |
505 | return pthread_mutex_trylock (mutex); | |
506 | else | |
507 | return 0; | |
508 | } | |
509 | ||
510 | static inline int | |
511 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
512 | { | |
513 | if (__gthread_active_p ()) | |
514 | return pthread_mutex_unlock (mutex); | |
515 | else | |
516 | return 0; | |
517 | } | |
518 | ||
15794a95 L |
519 | #endif /* _LIBOBJC */ |
520 | ||
88657302 | 521 | #endif /* ! GCC_GTHR_POSIX_H */ |