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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 | |
c95d07f8 JT |
77 | /* These really should be protected by _POSIX_PRIORITY_SCHEDULING, but |
78 | we use them inside a _POSIX_THREAD_PRIORITY_SCHEDULING block. */ | |
79 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING | |
f4b20cd9 RO |
80 | #pragma weak sched_get_priority_max |
81 | #pragma weak sched_get_priority_min | |
c95d07f8 | 82 | #endif /* _POSIX_THREAD_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 | { | |
c95d07f8 | 190 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
fe83a9ce KH |
191 | pthread_t thread_id = pthread_self (); |
192 | int policy; | |
193 | struct sched_param params; | |
194 | int priority_min, priority_max; | |
589005ff | 195 | |
fe83a9ce KH |
196 | if (pthread_getschedparam (thread_id, &policy, ¶ms) == 0) |
197 | { | |
198 | if ((priority_max = sched_get_priority_max (policy)) == -1) | |
199 | return -1; | |
200 | ||
201 | if ((priority_min = sched_get_priority_min (policy)) == -1) | |
202 | return -1; | |
589005ff | 203 | |
fe83a9ce KH |
204 | if (priority > priority_max) |
205 | priority = priority_max; | |
206 | else if (priority < priority_min) | |
207 | priority = priority_min; | |
208 | params.sched_priority = priority; | |
209 | ||
210 | /* | |
211 | * The solaris 7 and several other man pages incorrectly state that | |
212 | * this should be a pointer to policy but pthread.h is universally | |
213 | * at odds with this. | |
214 | */ | |
215 | if (pthread_setschedparam (thread_id, policy, ¶ms) == 0) | |
216 | return 0; | |
217 | } | |
c95d07f8 | 218 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
fe83a9ce KH |
219 | return -1; |
220 | } | |
15794a95 L |
221 | } |
222 | ||
71287280 | 223 | /* Return the current thread's priority. */ |
15794a95 | 224 | static inline int |
fe83a9ce | 225 | __gthread_objc_thread_get_priority (void) |
15794a95 | 226 | { |
c95d07f8 | 227 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
15794a95 | 228 | if (__gthread_active_p ()) |
447c11a5 OP |
229 | { |
230 | int policy; | |
231 | struct sched_param params; | |
232 | ||
fe83a9ce | 233 | if (pthread_getschedparam (pthread_self (), &policy, ¶ms) == 0) |
589005ff | 234 | return params.sched_priority; |
447c11a5 | 235 | else |
589005ff | 236 | return -1; |
447c11a5 | 237 | } |
15794a95 | 238 | else |
c95d07f8 | 239 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
15794a95 L |
240 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
241 | } | |
242 | ||
71287280 | 243 | /* Yield our process time to another thread. */ |
15794a95 | 244 | static inline void |
fe83a9ce | 245 | __gthread_objc_thread_yield (void) |
15794a95 L |
246 | { |
247 | if (__gthread_active_p ()) | |
fe83a9ce | 248 | sched_yield (); |
15794a95 L |
249 | } |
250 | ||
71287280 | 251 | /* Terminate the current thread. */ |
15794a95 | 252 | static inline int |
fe83a9ce | 253 | __gthread_objc_thread_exit (void) |
15794a95 L |
254 | { |
255 | if (__gthread_active_p ()) | |
256 | /* exit the thread */ | |
fe83a9ce | 257 | pthread_exit (&__objc_thread_exit_status); |
15794a95 L |
258 | |
259 | /* Failed if we reached here */ | |
260 | return -1; | |
261 | } | |
262 | ||
71287280 | 263 | /* Returns an integer value which uniquely describes a thread. */ |
15794a95 | 264 | static inline objc_thread_t |
fe83a9ce | 265 | __gthread_objc_thread_id (void) |
15794a95 L |
266 | { |
267 | if (__gthread_active_p ()) | |
fe83a9ce | 268 | return (objc_thread_t) pthread_self (); |
15794a95 | 269 | else |
fee013ef | 270 | return (objc_thread_t) 1; |
15794a95 L |
271 | } |
272 | ||
71287280 | 273 | /* Sets the thread's local storage pointer. */ |
15794a95 | 274 | static inline int |
fe83a9ce | 275 | __gthread_objc_thread_set_data (void *value) |
15794a95 L |
276 | { |
277 | if (__gthread_active_p ()) | |
fe83a9ce | 278 | return pthread_setspecific (_objc_thread_storage, value); |
15794a95 L |
279 | else |
280 | { | |
281 | thread_local_storage = value; | |
282 | return 0; | |
283 | } | |
284 | } | |
285 | ||
71287280 | 286 | /* Returns the thread's local storage pointer. */ |
15794a95 | 287 | static inline void * |
fe83a9ce | 288 | __gthread_objc_thread_get_data (void) |
15794a95 L |
289 | { |
290 | if (__gthread_active_p ()) | |
fe83a9ce | 291 | return pthread_getspecific (_objc_thread_storage); |
15794a95 L |
292 | else |
293 | return thread_local_storage; | |
294 | } | |
295 | ||
296 | /* Backend mutex functions */ | |
297 | ||
71287280 | 298 | /* Allocate a mutex. */ |
15794a95 | 299 | static inline int |
fe83a9ce | 300 | __gthread_objc_mutex_allocate (objc_mutex_t mutex) |
15794a95 L |
301 | { |
302 | if (__gthread_active_p ()) | |
303 | { | |
fe83a9ce | 304 | mutex->backend = objc_malloc (sizeof (pthread_mutex_t)); |
15794a95 | 305 | |
fe83a9ce | 306 | if (pthread_mutex_init ((pthread_mutex_t *) mutex->backend, NULL)) |
15794a95 | 307 | { |
fe83a9ce | 308 | objc_free (mutex->backend); |
15794a95 L |
309 | mutex->backend = NULL; |
310 | return -1; | |
311 | } | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
71287280 | 317 | /* Deallocate a mutex. */ |
15794a95 | 318 | static inline int |
fe83a9ce | 319 | __gthread_objc_mutex_deallocate (objc_mutex_t mutex) |
15794a95 L |
320 | { |
321 | if (__gthread_active_p ()) | |
322 | { | |
323 | int count; | |
324 | ||
325 | /* | |
326 | * Posix Threads specifically require that the thread be unlocked | |
327 | * for pthread_mutex_destroy to work. | |
328 | */ | |
329 | ||
330 | do | |
331 | { | |
fe83a9ce | 332 | count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend); |
15794a95 L |
333 | if (count < 0) |
334 | return -1; | |
335 | } | |
336 | while (count); | |
337 | ||
fe83a9ce | 338 | if (pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend)) |
15794a95 L |
339 | return -1; |
340 | ||
fe83a9ce | 341 | objc_free (mutex->backend); |
15794a95 L |
342 | mutex->backend = NULL; |
343 | } | |
344 | return 0; | |
345 | } | |
346 | ||
71287280 | 347 | /* Grab a lock on a mutex. */ |
15794a95 | 348 | static inline int |
fe83a9ce | 349 | __gthread_objc_mutex_lock (objc_mutex_t mutex) |
15794a95 | 350 | { |
589005ff | 351 | if (__gthread_active_p () |
fe83a9ce | 352 | && pthread_mutex_lock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
353 | { |
354 | return -1; | |
355 | } | |
356 | ||
357 | return 0; | |
15794a95 L |
358 | } |
359 | ||
71287280 | 360 | /* Try to grab a lock on a mutex. */ |
15794a95 | 361 | static inline int |
fe83a9ce | 362 | __gthread_objc_mutex_trylock (objc_mutex_t mutex) |
15794a95 | 363 | { |
589005ff | 364 | if (__gthread_active_p () |
fe83a9ce | 365 | && pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
366 | { |
367 | return -1; | |
368 | } | |
369 | ||
370 | return 0; | |
15794a95 L |
371 | } |
372 | ||
373 | /* Unlock the mutex */ | |
374 | static inline int | |
fe83a9ce | 375 | __gthread_objc_mutex_unlock (objc_mutex_t mutex) |
15794a95 | 376 | { |
589005ff | 377 | if (__gthread_active_p () |
fe83a9ce | 378 | && pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend) != 0) |
054af139 NP |
379 | { |
380 | return -1; | |
381 | } | |
382 | ||
383 | return 0; | |
15794a95 L |
384 | } |
385 | ||
386 | /* Backend condition mutex functions */ | |
387 | ||
71287280 | 388 | /* Allocate a condition. */ |
15794a95 | 389 | static inline int |
fe83a9ce | 390 | __gthread_objc_condition_allocate (objc_condition_t condition) |
15794a95 L |
391 | { |
392 | if (__gthread_active_p ()) | |
393 | { | |
fe83a9ce | 394 | condition->backend = objc_malloc (sizeof (pthread_cond_t)); |
15794a95 | 395 | |
fe83a9ce | 396 | if (pthread_cond_init ((pthread_cond_t *) condition->backend, NULL)) |
15794a95 | 397 | { |
fe83a9ce | 398 | objc_free (condition->backend); |
15794a95 L |
399 | condition->backend = NULL; |
400 | return -1; | |
401 | } | |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
71287280 | 407 | /* Deallocate a condition. */ |
15794a95 | 408 | static inline int |
fe83a9ce | 409 | __gthread_objc_condition_deallocate (objc_condition_t condition) |
15794a95 L |
410 | { |
411 | if (__gthread_active_p ()) | |
412 | { | |
fe83a9ce | 413 | if (pthread_cond_destroy ((pthread_cond_t *) condition->backend)) |
15794a95 L |
414 | return -1; |
415 | ||
fe83a9ce | 416 | objc_free (condition->backend); |
15794a95 L |
417 | condition->backend = NULL; |
418 | } | |
419 | return 0; | |
420 | } | |
421 | ||
422 | /* Wait on the condition */ | |
423 | static inline int | |
fe83a9ce | 424 | __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) |
15794a95 L |
425 | { |
426 | if (__gthread_active_p ()) | |
fe83a9ce KH |
427 | return pthread_cond_wait ((pthread_cond_t *) condition->backend, |
428 | (pthread_mutex_t *) mutex->backend); | |
15794a95 L |
429 | else |
430 | return 0; | |
431 | } | |
432 | ||
71287280 | 433 | /* Wake up all threads waiting on this condition. */ |
15794a95 | 434 | static inline int |
fe83a9ce | 435 | __gthread_objc_condition_broadcast (objc_condition_t condition) |
15794a95 L |
436 | { |
437 | if (__gthread_active_p ()) | |
fe83a9ce | 438 | return pthread_cond_broadcast ((pthread_cond_t *) condition->backend); |
15794a95 L |
439 | else |
440 | return 0; | |
441 | } | |
442 | ||
71287280 | 443 | /* Wake up one thread waiting on this condition. */ |
15794a95 | 444 | static inline int |
fe83a9ce | 445 | __gthread_objc_condition_signal (objc_condition_t condition) |
15794a95 L |
446 | { |
447 | if (__gthread_active_p ()) | |
fe83a9ce | 448 | return pthread_cond_signal ((pthread_cond_t *) condition->backend); |
15794a95 L |
449 | else |
450 | return 0; | |
451 | } | |
452 | ||
453 | #else /* _LIBOBJC */ | |
454 | ||
f24af81b | 455 | static inline int |
d1e51320 | 456 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
f24af81b TT |
457 | { |
458 | if (__gthread_active_p ()) | |
459 | return pthread_once (once, func); | |
460 | else | |
461 | return -1; | |
462 | } | |
463 | ||
464 | static inline int | |
465 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) | |
466 | { | |
467 | return pthread_key_create (key, dtor); | |
468 | } | |
469 | ||
f24af81b TT |
470 | static inline int |
471 | __gthread_key_delete (__gthread_key_t key) | |
472 | { | |
473 | return pthread_key_delete (key); | |
474 | } | |
475 | ||
476 | static inline void * | |
477 | __gthread_getspecific (__gthread_key_t key) | |
478 | { | |
479 | return pthread_getspecific (key); | |
480 | } | |
481 | ||
482 | static inline int | |
483 | __gthread_setspecific (__gthread_key_t key, const void *ptr) | |
484 | { | |
485 | return pthread_setspecific (key, ptr); | |
486 | } | |
487 | ||
488 | static inline int | |
489 | __gthread_mutex_lock (__gthread_mutex_t *mutex) | |
490 | { | |
491 | if (__gthread_active_p ()) | |
492 | return pthread_mutex_lock (mutex); | |
493 | else | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static inline int | |
498 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) | |
499 | { | |
500 | if (__gthread_active_p ()) | |
501 | return pthread_mutex_trylock (mutex); | |
502 | else | |
503 | return 0; | |
504 | } | |
505 | ||
506 | static inline int | |
507 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) | |
508 | { | |
509 | if (__gthread_active_p ()) | |
510 | return pthread_mutex_unlock (mutex); | |
511 | else | |
512 | return 0; | |
513 | } | |
514 | ||
15794a95 L |
515 | #endif /* _LIBOBJC */ |
516 | ||
88657302 | 517 | #endif /* ! GCC_GTHR_POSIX_H */ |