1 /* Threads compatibility routines for libgcc2 and libobjc. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000, 2004, 2005, 2006
4 Free Software Foundation, Inc.
5
6 This file is part of GCC.
7
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.
12
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.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
21 02110-1301, USA. */
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
30 #ifndef GCC_GTHR_SOLARIS_H
31 #define GCC_GTHR_SOLARIS_H
32
33 /* Solaris threads as found in Solaris 2.[456].
34 Actually these are Unix International (UI) threads, but I don't
35 know if anyone else implements these. */
36
37 #define __GTHREADS 1
38
39 #include <thread.h>
40 #include <errno.h>
41
42 #ifdef __cplusplus
43 #define UNUSED(x)
44 #else
45 #define UNUSED(x) x __attribute__((unused))
46 #endif
47
48 typedef thread_key_t __gthread_key_t;
49 typedef struct {
50 mutex_t mutex;
51 int once;
52 } __gthread_once_t;
53 typedef mutex_t __gthread_mutex_t;
54
55 typedef struct {
56 long depth;
57 thread_t owner;
58 mutex_t actual;
59 } __gthread_recursive_mutex_t;
60
61 #define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
62 #define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
63 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
64
65 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
66 # define __gthrw(name) \
67 static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
68 # define __gthrw_(name) __gthrw_ ## name
69 #else
70 # define __gthrw(name)
71 # define __gthrw_(name) name
72 #endif
73
74 __gthrw(thr_keycreate)
__gthrw(thr_getspecific)75 __gthrw(thr_getspecific)
76 __gthrw(thr_setspecific)
77 __gthrw(thr_create)
78 __gthrw(thr_self)
79
80 __gthrw(mutex_init)
81 __gthrw(mutex_destroy)
82 __gthrw(mutex_lock)
83 __gthrw(mutex_trylock)
84 __gthrw(mutex_unlock)
85
86 #ifdef _LIBOBJC
87 __gthrw(thr_exit)
88 __gthrw(thr_getprio)
89 __gthrw(thr_setprio)
90 __gthrw(thr_yield)
91
92 __gthrw(cond_init)
93 __gthrw(cond_destroy)
94 __gthrw(cond_wait)
95 __gthrw(cond_broadcast)
96 __gthrw(cond_signal)
97
98 #endif
99
100 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
101
102 /* This will not actually work in Solaris 2.5, since libc contains
103 dummy symbols of all thr_* routines. */
104
105 static inline int
106 __gthread_active_p (void)
107 {
108 static void *const __gthread_active_ptr = (void *) &__gthrw_(thr_create);
109 return __gthread_active_ptr != 0;
110 }
111
112 #else /* not SUPPORTS_WEAK */
113
114 static inline int
115 __gthread_active_p (void)
116 {
117 return 1;
118 }
119
120 #endif /* SUPPORTS_WEAK */
121
122 #ifdef _LIBOBJC
123
124 /* Key structure for maintaining thread specific storage */
125 static thread_key_t _objc_thread_storage;
126
127 /* Thread local storage for a single thread */
128 static void *thread_local_storage = NULL;
129
130 /* Backend initialization functions */
131
132 /* Initialize the threads subsystem. */
133 static inline int
__gthread_objc_init_thread_system(void)134 __gthread_objc_init_thread_system (void)
135 {
136 /* Initialize the thread storage key. */
137 if (__gthread_active_p ()
138 && __gthrw_(thr_keycreate) (&_objc_thread_storage, NULL) == 0)
139 return 0;
140
141 return -1;
142 }
143
144 /* Close the threads subsystem. */
145 static inline int
__gthread_objc_close_thread_system(void)146 __gthread_objc_close_thread_system (void)
147 {
148 if (__gthread_active_p ())
149 return 0;
150 else
151 return -1;
152 }
153
154 /* Backend thread functions */
155
156 /* Create a new thread of execution. */
157 static inline objc_thread_t
__gthread_objc_thread_detach(void (* func)(void *),void * arg)158 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
159 {
160 objc_thread_t thread_id;
161 thread_t new_thread_id = 0;
162
163 if (!__gthread_active_p ())
164 return NULL;
165
166 if (__gthrw_(thr_create) (NULL, 0, (void *) func, arg,
167 THR_DETACHED | THR_NEW_LWP,
168 &new_thread_id) == 0)
169 thread_id = *(objc_thread_t *) &new_thread_id;
170 else
171 thread_id = NULL;
172
173 return thread_id;
174 }
175
176 /* Set the current thread's priority. */
177 static inline int
__gthread_objc_thread_set_priority(int priority)178 __gthread_objc_thread_set_priority (int priority)
179 {
180 int sys_priority = 0;
181
182 if (!__gthread_active_p ())
183 return -1;
184
185 switch (priority)
186 {
187 case OBJC_THREAD_INTERACTIVE_PRIORITY:
188 sys_priority = 300;
189 break;
190 default:
191 case OBJC_THREAD_BACKGROUND_PRIORITY:
192 sys_priority = 200;
193 break;
194 case OBJC_THREAD_LOW_PRIORITY:
195 sys_priority = 1000;
196 break;
197 }
198
199 /* Change priority */
200 if (__gthrw_(thr_setprio) (__gthrw_(thr_self) (), sys_priority) == 0)
201 return 0;
202 else
203 return -1;
204 }
205
206 /* Return the current thread's priority. */
207 static inline int
__gthread_objc_thread_get_priority(void)208 __gthread_objc_thread_get_priority (void)
209 {
210 int sys_priority;
211
212 if (!__gthread_active_p ())
213 return OBJC_THREAD_INTERACTIVE_PRIORITY;
214
215 if (__gthrw_(thr_getprio) (__gthrw_(thr_self) (), &sys_priority) == 0)
216 {
217 if (sys_priority >= 250)
218 return OBJC_THREAD_INTERACTIVE_PRIORITY;
219 else if (sys_priority >= 150)
220 return OBJC_THREAD_BACKGROUND_PRIORITY;
221 return OBJC_THREAD_LOW_PRIORITY;
222 }
223
224 /* Couldn't get priority. */
225 return -1;
226 }
227
228 /* Yield our process time to another thread. */
229 static inline void
__gthread_objc_thread_yield(void)230 __gthread_objc_thread_yield (void)
231 {
232 if (__gthread_active_p ())
233 __gthrw_(thr_yield) ();
234 }
235
236 /* Terminate the current thread. */
237 static inline int
__gthread_objc_thread_exit(void)238 __gthread_objc_thread_exit (void)
239 {
240 if (__gthread_active_p ())
241 /* exit the thread */
242 __gthrw_(thr_exit) (&__objc_thread_exit_status);
243
244 /* Failed if we reached here */
245 return -1;
246 }
247
248 /* Returns an integer value which uniquely describes a thread. */
249 static inline objc_thread_t
__gthread_objc_thread_id(void)250 __gthread_objc_thread_id (void)
251 {
252 if (__gthread_active_p ())
253 return (objc_thread_t) __gthrw_(thr_self) ();
254 else
255 return (objc_thread_t) 1;
256 }
257
258 /* Sets the thread's local storage pointer. */
259 static inline int
__gthread_objc_thread_set_data(void * value)260 __gthread_objc_thread_set_data (void *value)
261 {
262 if (__gthread_active_p ())
263 {
264 if (__gthrw_(thr_setspecific) (_objc_thread_storage, value) == 0)
265 return 0;
266 else
267 return -1;
268 }
269 else
270 {
271 thread_local_storage = value;
272 return 0;
273 }
274 }
275
276 /* Returns the thread's local storage pointer. */
277 static inline void *
__gthread_objc_thread_get_data(void)278 __gthread_objc_thread_get_data (void)
279 {
280 void *value = NULL;
281
282 if (__gthread_active_p ())
283 {
284 if (__gthrw_(thr_getspecific) (_objc_thread_storage, &value) == 0)
285 return value;
286 else
287 return NULL;
288 }
289 else
290 return thread_local_storage;
291 }
292
293 /* Backend mutex functions */
294
295 /* Allocate a mutex. */
296 static inline int
__gthread_objc_mutex_allocate(objc_mutex_t mutex)297 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
298 {
299 if (__gthread_active_p ()
300 && __gthrw_(mutex_init) ((mutex_t *) (&(mutex->backend)), USYNC_THREAD, 0))
301 return -1;
302
303 return 0;
304 }
305
306 /* Deallocate a mutex. */
307 static inline int
__gthread_objc_mutex_deallocate(objc_mutex_t mutex)308 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
309 {
310 if (__gthread_active_p ())
311 __gthrw_(mutex_destroy) ((mutex_t *) (&(mutex->backend)));
312
313 return 0;
314 }
315
316 /* Grab a lock on a mutex. */
317 static inline int
__gthread_objc_mutex_lock(objc_mutex_t mutex)318 __gthread_objc_mutex_lock (objc_mutex_t mutex)
319 {
320 if (__gthread_active_p ()
321 && __gthrw_(mutex_lock) ((mutex_t *) (&(mutex->backend))) != 0)
322 return -1;
323
324 return 0;
325 }
326
327 /* Try to grab a lock on a mutex. */
328 static inline int
__gthread_objc_mutex_trylock(objc_mutex_t mutex)329 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
330 {
331 if (__gthread_active_p ()
332 && __gthrw_(mutex_trylock) ((mutex_t *) (&(mutex->backend))) != 0)
333 return -1;
334
335 return 0;
336 }
337
338 /* Unlock the mutex */
339 static inline int
__gthread_objc_mutex_unlock(objc_mutex_t mutex)340 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
341 {
342 if (__gthread_active_p ()
343 && __gthrw_(mutex_unlock) ((mutex_t *) (&(mutex->backend))) != 0)
344 return -1;
345
346 return 0;
347 }
348
349 /* Backend condition mutex functions */
350
351 /* Allocate a condition. */
352 static inline int
__gthread_objc_condition_allocate(objc_condition_t condition)353 __gthread_objc_condition_allocate (objc_condition_t condition)
354 {
355 if (__gthread_active_p ())
356 return __gthrw_(cond_init) ((cond_t *) (&(condition->backend)), USYNC_THREAD,
357 NULL);
358 else
359 return 0;
360 }
361
362 /* Deallocate a condition. */
363 static inline int
__gthread_objc_condition_deallocate(objc_condition_t condition)364 __gthread_objc_condition_deallocate (objc_condition_t condition)
365 {
366 if (__gthread_active_p ())
367 return __gthrw_(cond_destroy) ((cond_t *) (&(condition->backend)));
368 else
369 return 0;
370 }
371
372 /* Wait on the condition */
373 static inline int
__gthread_objc_condition_wait(objc_condition_t condition,objc_mutex_t mutex)374 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
375 {
376 if (__gthread_active_p ())
377 return __gthrw_(cond_wait) ((cond_t *) (&(condition->backend)),
378 (mutex_t *) (&(mutex->backend)));
379 else
380 return 0;
381 }
382
383 /* Wake up all threads waiting on this condition. */
384 static inline int
__gthread_objc_condition_broadcast(objc_condition_t condition)385 __gthread_objc_condition_broadcast (objc_condition_t condition)
386 {
387 if (__gthread_active_p ())
388 return __gthrw_(cond_broadcast) ((cond_t *) (&(condition->backend)));
389 else
390 return 0;
391 }
392
393 /* Wake up one thread waiting on this condition. */
394 static inline int
__gthread_objc_condition_signal(objc_condition_t condition)395 __gthread_objc_condition_signal (objc_condition_t condition)
396 {
397 if (__gthread_active_p ())
398 return __gthrw_(cond_signal) ((cond_t *) (&(condition->backend)));
399 else
400 return 0;
401 }
402
403 #else /* _LIBOBJC */
404
405 static inline int
__gthread_once(__gthread_once_t * once,void (* func)(void))406 __gthread_once (__gthread_once_t *once, void (*func) (void))
407 {
408 if (! __gthread_active_p ())
409 return -1;
410
411 if (once == 0 || func == 0)
412 return EINVAL;
413
414 if (once->once == 0)
415 {
416 int status = __gthrw_(mutex_lock) (&once->mutex);
417 if (status != 0)
418 return status;
419 if (once->once == 0)
420 {
421 (*func) ();
422 once->once++;
423 }
424 __gthrw_(mutex_unlock) (&once->mutex);
425 }
426 return 0;
427 }
428
429 static inline int
__gthread_key_create(__gthread_key_t * key,void (* dtor)(void *))430 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
431 {
432 /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
433 got a reasonable key value, and if not, fail. */
434 *key = (__gthread_key_t)-1;
435 if (__gthrw_(thr_keycreate) (key, dtor) != 0 || *key == (__gthread_key_t)-1)
436 return -1;
437 else
438 return 0;
439 }
440
441 static inline int
__gthread_key_delete(__gthread_key_t UNUSED (key))442 __gthread_key_delete (__gthread_key_t UNUSED (key))
443 {
444 /* Not possible. */
445 return -1;
446 }
447
448 static inline void *
__gthread_getspecific(__gthread_key_t key)449 __gthread_getspecific (__gthread_key_t key)
450 {
451 void *ptr;
452 if (__gthrw_(thr_getspecific) (key, &ptr) == 0)
453 return ptr;
454 else
455 return 0;
456 }
457
458 static inline int
__gthread_setspecific(__gthread_key_t key,const void * ptr)459 __gthread_setspecific (__gthread_key_t key, const void *ptr)
460 {
461 return __gthrw_(thr_setspecific) (key, (void *) ptr);
462 }
463
464 static inline int
__gthread_mutex_lock(__gthread_mutex_t * mutex)465 __gthread_mutex_lock (__gthread_mutex_t *mutex)
466 {
467 if (__gthread_active_p ())
468 return __gthrw_(mutex_lock) (mutex);
469 else
470 return 0;
471 }
472
473 static inline int
__gthread_mutex_trylock(__gthread_mutex_t * mutex)474 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
475 {
476 if (__gthread_active_p ())
477 return __gthrw_(mutex_trylock) (mutex);
478 else
479 return 0;
480 }
481
482 static inline int
__gthread_mutex_unlock(__gthread_mutex_t * mutex)483 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
484 {
485 if (__gthread_active_p ())
486 return __gthrw_(mutex_unlock) (mutex);
487 else
488 return 0;
489 }
490
491 static inline int
__gthread_recursive_mutex_init_function(__gthread_recursive_mutex_t * mutex)492 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
493 {
494 mutex->depth = 0;
495 mutex->owner = (thread_t) 0;
496 return __gthrw_(mutex_init) (&mutex->actual, USYNC_THREAD, 0);
497 }
498
499 static inline int
__gthread_recursive_mutex_lock(__gthread_recursive_mutex_t * mutex)500 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
501 {
502 if (__gthread_active_p ())
503 {
504 thread_t me = __gthrw_(thr_self) ();
505
506 if (mutex->owner != me)
507 {
508 __gthrw_(mutex_lock) (&mutex->actual);
509 mutex->owner = me;
510 }
511
512 mutex->depth++;
513 }
514 return 0;
515 }
516
517 static inline int
__gthread_recursive_mutex_trylock(__gthread_recursive_mutex_t * mutex)518 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
519 {
520 if (__gthread_active_p ())
521 {
522 thread_t me = __gthrw_(thr_self) ();
523
524 if (mutex->owner != me)
525 {
526 if (__gthrw_(mutex_trylock) (&mutex->actual))
527 return 1;
528 mutex->owner = me;
529 }
530
531 mutex->depth++;
532 }
533 return 0;
534 }
535
536 static inline int
__gthread_recursive_mutex_unlock(__gthread_recursive_mutex_t * mutex)537 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
538 {
539 if (__gthread_active_p ())
540 {
541 if (--mutex->depth == 0)
542 {
543 mutex->owner = (thread_t) 0;
544 __gthrw_(mutex_unlock) (&mutex->actual);
545 }
546 }
547 return 0;
548 }
549
550 #endif /* _LIBOBJC */
551
552 #undef UNUSED
553
554 #endif /* ! GCC_GTHR_SOLARIS_H */
555