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88e17b57 | 1 | /* GNU Objective C Runtime Thread Interface |
88a2722e | 2 | Copyright (C) 1996, 1997, 2009, 2010 Free Software Foundation, Inc. |
88e17b57 BE |
3 | Contributed by Galen C. Hunt (gchunt@cs.rochester.edu) |
4 | ||
38709cad | 5 | This file is part of GCC. |
88e17b57 | 6 | |
38709cad | 7 | GCC is free software; you can redistribute it and/or modify it under the |
88e17b57 | 8 | terms of the GNU General Public License as published by the Free Software |
748086b7 | 9 | Foundation; either version 3, or (at your option) any later version. |
88e17b57 | 10 | |
38709cad | 11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
88e17b57 BE |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more | |
14 | details. | |
15 | ||
748086b7 JJ |
16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
88e17b57 | 24 | |
6dead247 | 25 | #include "objc-private/common.h" |
7b869986 | 26 | #include "objc-private/error.h" |
88a2722e NP |
27 | #define _LIBOBJC |
28 | /* The line below is needed for declarations of functions such as | |
29 | pthread_mutexattr_settype, without which gthr-posix.h may fail to | |
30 | compile within libobjc. Unfortunately, this breaks compilation on | |
31 | Tru64 UNIX V4.0F, so disable it there. */ | |
32 | #ifndef __osf__ | |
33 | #define _XOPEN_SOURCE 500 | |
34 | #endif | |
35 | #include "config.h" | |
36 | #include "tconfig.h" | |
37 | #include "coretypes.h" | |
38 | #include "tm.h" | |
39 | #include "defaults.h" | |
40 | #include "objc/thr.h" | |
718a8e53 | 41 | #include "objc/runtime.h" |
a19fac96 | 42 | #include "objc-private/runtime.h" |
88a2722e | 43 | #include <gthr.h> |
88e17b57 BE |
44 | |
45 | #include <stdlib.h> | |
88e17b57 BE |
46 | |
47 | /* Global exit status. */ | |
48 | int __objc_thread_exit_status = 0; | |
49 | ||
50 | /* Flag which lets us know if we ever became multi threaded */ | |
51 | int __objc_is_multi_threaded = 0; | |
52 | ||
53 | /* The hook function called when the runtime becomes multi threaded */ | |
54 | objc_thread_callback _objc_became_multi_threaded = NULL; | |
55 | ||
56 | /* | |
57 | Use this to set the hook function that will be called when the | |
58 | runtime initially becomes multi threaded. | |
59 | The hook function is only called once, meaning only when the | |
60 | 2nd thread is spawned, not for each and every thread. | |
61 | ||
62 | It returns the previous hook function or NULL if there is none. | |
63 | ||
64 | A program outside of the runtime could set this to some function so | |
65 | it can be informed; for example, the GNUstep Base Library sets it | |
66 | so it can implement the NSBecomingMultiThreaded notification. | |
67 | */ | |
40165636 | 68 | objc_thread_callback objc_set_thread_callback (objc_thread_callback func) |
88e17b57 BE |
69 | { |
70 | objc_thread_callback temp = _objc_became_multi_threaded; | |
71 | _objc_became_multi_threaded = func; | |
72 | return temp; | |
73 | } | |
74 | ||
75 | /* | |
76 | Private functions | |
77 | ||
78 | These functions are utilized by the frontend, but they are not | |
79 | considered part of the public interface. | |
80 | */ | |
81 | ||
88a2722e NP |
82 | /* Initialize the threads subsystem. */ |
83 | int | |
84 | __objc_init_thread_system(void) | |
85 | { | |
86 | return __gthread_objc_init_thread_system (); | |
87 | } | |
88 | ||
88e17b57 BE |
89 | /* |
90 | First function called in a thread, starts everything else. | |
91 | ||
92 | This function is passed to the backend by objc_thread_detach | |
93 | as the starting function for a new thread. | |
94 | */ | |
95 | struct __objc_thread_start_state | |
96 | { | |
97 | SEL selector; | |
98 | id object; | |
99 | id argument; | |
100 | }; | |
101 | ||
bc012a44 AP |
102 | static void __attribute__((noreturn)) |
103 | __objc_thread_detach_function (struct __objc_thread_start_state *istate) | |
88e17b57 BE |
104 | { |
105 | /* Valid state? */ | |
106 | if (istate) { | |
40165636 | 107 | id (*imp) (id, SEL, id); |
88e17b57 BE |
108 | SEL selector = istate->selector; |
109 | id object = istate->object; | |
110 | id argument = istate->argument; | |
111 | ||
112 | /* Don't need anymore so free it */ | |
40165636 | 113 | objc_free (istate); |
88e17b57 BE |
114 | |
115 | /* Clear out the thread local storage */ | |
40165636 | 116 | objc_thread_set_data (NULL); |
88e17b57 BE |
117 | |
118 | /* Check to see if we just became multi threaded */ | |
40165636 | 119 | if (! __objc_is_multi_threaded) |
88e17b57 BE |
120 | { |
121 | __objc_is_multi_threaded = 1; | |
122 | ||
123 | /* Call the hook function */ | |
124 | if (_objc_became_multi_threaded != NULL) | |
40165636 | 125 | (*_objc_became_multi_threaded) (); |
88e17b57 BE |
126 | } |
127 | ||
128 | /* Call the method */ | |
40165636 RB |
129 | if ((imp = (id (*) (id, SEL, id))objc_msg_lookup (object, selector))) |
130 | (*imp) (object, selector, argument); | |
88e17b57 | 131 | else |
7b869986 NP |
132 | { |
133 | /* FIXME: Should we abort here ? */ | |
134 | _objc_abort ("objc_thread_detach called with bad selector.\n"); | |
135 | } | |
88e17b57 BE |
136 | } |
137 | else | |
7b869986 NP |
138 | { |
139 | /* FIXME: Should we abort here ? */ | |
140 | _objc_abort ("objc_thread_detach called with NULL state.\n"); | |
141 | } | |
88e17b57 BE |
142 | |
143 | /* Exit the thread */ | |
40165636 | 144 | objc_thread_exit (); |
b15b7ef8 KT |
145 | |
146 | /* Make sure compiler detects no return. */ | |
147 | __builtin_trap (); | |
88e17b57 BE |
148 | } |
149 | ||
150 | /* | |
151 | Frontend functions | |
152 | ||
153 | These functions constitute the public interface to the Objective-C thread | |
154 | and mutex functionality. | |
155 | */ | |
156 | ||
157 | /* Frontend thread functions */ | |
158 | ||
159 | /* | |
160 | Detach a new thread of execution and return its id. Returns NULL if fails. | |
161 | Thread is started by sending message with selector to object. Message | |
162 | takes a single argument. | |
163 | */ | |
164 | objc_thread_t | |
40165636 | 165 | objc_thread_detach (SEL selector, id object, id argument) |
88e17b57 BE |
166 | { |
167 | struct __objc_thread_start_state *istate; | |
168 | objc_thread_t thread_id = NULL; | |
169 | ||
170 | /* Allocate the state structure */ | |
40165636 RB |
171 | if (! (istate = (struct __objc_thread_start_state *) |
172 | objc_malloc (sizeof (*istate)))) | |
88e17b57 BE |
173 | return NULL; |
174 | ||
175 | /* Initialize the state structure */ | |
176 | istate->selector = selector; | |
177 | istate->object = object; | |
178 | istate->argument = argument; | |
179 | ||
180 | /* lock access */ | |
40165636 | 181 | objc_mutex_lock (__objc_runtime_mutex); |
88e17b57 BE |
182 | |
183 | /* Call the backend to spawn the thread */ | |
88a2722e NP |
184 | if ((thread_id = __gthread_objc_thread_detach ((void *)__objc_thread_detach_function, |
185 | istate)) == NULL) | |
88e17b57 BE |
186 | { |
187 | /* failed! */ | |
40165636 RB |
188 | objc_mutex_unlock (__objc_runtime_mutex); |
189 | objc_free (istate); | |
88e17b57 BE |
190 | return NULL; |
191 | } | |
192 | ||
193 | /* Increment our thread counter */ | |
194 | __objc_runtime_threads_alive++; | |
40165636 | 195 | objc_mutex_unlock (__objc_runtime_mutex); |
88e17b57 BE |
196 | |
197 | return thread_id; | |
198 | } | |
199 | ||
200 | /* Set the current thread's priority. */ | |
201 | int | |
40165636 | 202 | objc_thread_set_priority (int priority) |
88e17b57 BE |
203 | { |
204 | /* Call the backend */ | |
88a2722e | 205 | return __gthread_objc_thread_set_priority (priority); |
88e17b57 BE |
206 | } |
207 | ||
208 | /* Return the current thread's priority. */ | |
209 | int | |
40165636 | 210 | objc_thread_get_priority (void) |
88e17b57 BE |
211 | { |
212 | /* Call the backend */ | |
88a2722e | 213 | return __gthread_objc_thread_get_priority (); |
88e17b57 BE |
214 | } |
215 | ||
216 | /* | |
217 | Yield our process time to another thread. Any BUSY waiting that is done | |
218 | by a thread should use this function to make sure that other threads can | |
219 | make progress even on a lazy uniprocessor system. | |
220 | */ | |
221 | void | |
40165636 | 222 | objc_thread_yield (void) |
88e17b57 BE |
223 | { |
224 | /* Call the backend */ | |
88a2722e | 225 | __gthread_objc_thread_yield (); |
88e17b57 BE |
226 | } |
227 | ||
228 | /* | |
229 | Terminate the current tread. Doesn't return. | |
230 | Actually, if it failed returns -1. | |
231 | */ | |
232 | int | |
40165636 | 233 | objc_thread_exit (void) |
88e17b57 BE |
234 | { |
235 | /* Decrement our counter of the number of threads alive */ | |
40165636 | 236 | objc_mutex_lock (__objc_runtime_mutex); |
88e17b57 | 237 | __objc_runtime_threads_alive--; |
40165636 | 238 | objc_mutex_unlock (__objc_runtime_mutex); |
88e17b57 BE |
239 | |
240 | /* Call the backend to terminate the thread */ | |
88a2722e | 241 | return __gthread_objc_thread_exit (); |
88e17b57 BE |
242 | } |
243 | ||
244 | /* | |
245 | Returns an integer value which uniquely describes a thread. Must not be | |
246 | NULL which is reserved as a marker for "no thread". | |
247 | */ | |
248 | objc_thread_t | |
40165636 | 249 | objc_thread_id (void) |
88e17b57 BE |
250 | { |
251 | /* Call the backend */ | |
88a2722e | 252 | return __gthread_objc_thread_id (); |
88e17b57 BE |
253 | } |
254 | ||
255 | /* | |
256 | Sets the thread's local storage pointer. | |
257 | Returns 0 if successful or -1 if failed. | |
258 | */ | |
259 | int | |
40165636 | 260 | objc_thread_set_data (void *value) |
88e17b57 BE |
261 | { |
262 | /* Call the backend */ | |
88a2722e | 263 | return __gthread_objc_thread_set_data (value); |
88e17b57 BE |
264 | } |
265 | ||
266 | /* | |
267 | Returns the thread's local storage pointer. Returns NULL on failure. | |
268 | */ | |
269 | void * | |
40165636 | 270 | objc_thread_get_data (void) |
88e17b57 BE |
271 | { |
272 | /* Call the backend */ | |
88a2722e | 273 | return __gthread_objc_thread_get_data (); |
88e17b57 BE |
274 | } |
275 | ||
276 | /* Frontend mutex functions */ | |
277 | ||
278 | /* | |
279 | Allocate a mutex. Return the mutex pointer if successful or NULL if the | |
280 | allocation failed for any reason. | |
281 | */ | |
282 | objc_mutex_t | |
40165636 | 283 | objc_mutex_allocate (void) |
88e17b57 BE |
284 | { |
285 | objc_mutex_t mutex; | |
286 | ||
287 | /* Allocate the mutex structure */ | |
40165636 | 288 | if (! (mutex = (objc_mutex_t)objc_malloc (sizeof (struct objc_mutex)))) |
88e17b57 BE |
289 | return NULL; |
290 | ||
291 | /* Call backend to create the mutex */ | |
88a2722e | 292 | if (__gthread_objc_mutex_allocate (mutex)) |
88e17b57 BE |
293 | { |
294 | /* failed! */ | |
40165636 | 295 | objc_free (mutex); |
88e17b57 BE |
296 | return NULL; |
297 | } | |
298 | ||
299 | /* Initialize mutex */ | |
300 | mutex->owner = NULL; | |
301 | mutex->depth = 0; | |
302 | return mutex; | |
303 | } | |
304 | ||
305 | /* | |
306 | Deallocate a mutex. Note that this includes an implicit mutex_lock to | |
307 | insure that no one else is using the lock. It is legal to deallocate | |
308 | a lock if we have a lock on it, but illegal to deallocate a lock held | |
309 | by anyone else. | |
310 | Returns the number of locks on the thread. (1 for deallocate). | |
311 | */ | |
312 | int | |
40165636 | 313 | objc_mutex_deallocate (objc_mutex_t mutex) |
88e17b57 BE |
314 | { |
315 | int depth; | |
316 | ||
317 | /* Valid mutex? */ | |
40165636 | 318 | if (! mutex) |
88e17b57 BE |
319 | return -1; |
320 | ||
321 | /* Acquire lock on mutex */ | |
40165636 | 322 | depth = objc_mutex_lock (mutex); |
88e17b57 BE |
323 | |
324 | /* Call backend to destroy mutex */ | |
88a2722e | 325 | if (__gthread_objc_mutex_deallocate (mutex)) |
88e17b57 BE |
326 | return -1; |
327 | ||
328 | /* Free the mutex structure */ | |
40165636 | 329 | objc_free (mutex); |
88e17b57 BE |
330 | |
331 | /* Return last depth */ | |
332 | return depth; | |
333 | } | |
334 | ||
335 | /* | |
336 | Grab a lock on a mutex. If this thread already has a lock on this mutex | |
337 | then we increment the lock count. If another thread has a lock on the | |
338 | mutex we block and wait for the thread to release the lock. | |
339 | Returns the lock count on the mutex held by this thread. | |
340 | */ | |
341 | int | |
40165636 | 342 | objc_mutex_lock (objc_mutex_t mutex) |
88e17b57 BE |
343 | { |
344 | objc_thread_t thread_id; | |
345 | int status; | |
346 | ||
347 | /* Valid mutex? */ | |
40165636 | 348 | if (! mutex) |
88e17b57 BE |
349 | return -1; |
350 | ||
351 | /* If we already own the lock then increment depth */ | |
88a2722e | 352 | thread_id = __gthread_objc_thread_id (); |
88e17b57 BE |
353 | if (mutex->owner == thread_id) |
354 | return ++mutex->depth; | |
355 | ||
356 | /* Call the backend to lock the mutex */ | |
88a2722e | 357 | status = __gthread_objc_mutex_lock (mutex); |
88e17b57 BE |
358 | |
359 | /* Failed? */ | |
360 | if (status) | |
361 | return status; | |
362 | ||
363 | /* Successfully locked the thread */ | |
364 | mutex->owner = thread_id; | |
365 | return mutex->depth = 1; | |
366 | } | |
367 | ||
368 | /* | |
369 | Try to grab a lock on a mutex. If this thread already has a lock on | |
370 | this mutex then we increment the lock count and return it. If another | |
371 | thread has a lock on the mutex returns -1. | |
372 | */ | |
373 | int | |
40165636 | 374 | objc_mutex_trylock (objc_mutex_t mutex) |
88e17b57 BE |
375 | { |
376 | objc_thread_t thread_id; | |
377 | int status; | |
378 | ||
379 | /* Valid mutex? */ | |
40165636 | 380 | if (! mutex) |
88e17b57 BE |
381 | return -1; |
382 | ||
383 | /* If we already own the lock then increment depth */ | |
88a2722e | 384 | thread_id = __gthread_objc_thread_id (); |
88e17b57 BE |
385 | if (mutex->owner == thread_id) |
386 | return ++mutex->depth; | |
387 | ||
388 | /* Call the backend to try to lock the mutex */ | |
88a2722e | 389 | status = __gthread_objc_mutex_trylock (mutex); |
88e17b57 BE |
390 | |
391 | /* Failed? */ | |
392 | if (status) | |
393 | return status; | |
394 | ||
395 | /* Successfully locked the thread */ | |
396 | mutex->owner = thread_id; | |
397 | return mutex->depth = 1; | |
398 | } | |
399 | ||
400 | /* | |
401 | Unlocks the mutex by one level. | |
402 | Decrements the lock count on this mutex by one. | |
403 | If the lock count reaches zero, release the lock on the mutex. | |
404 | Returns the lock count on the mutex. | |
405 | It is an error to attempt to unlock a mutex which this thread | |
406 | doesn't hold in which case return -1 and the mutex is unaffected. | |
407 | */ | |
408 | int | |
40165636 | 409 | objc_mutex_unlock (objc_mutex_t mutex) |
88e17b57 BE |
410 | { |
411 | objc_thread_t thread_id; | |
412 | int status; | |
413 | ||
414 | /* Valid mutex? */ | |
40165636 | 415 | if (! mutex) |
88e17b57 BE |
416 | return -1; |
417 | ||
418 | /* If another thread owns the lock then abort */ | |
88a2722e | 419 | thread_id = __gthread_objc_thread_id (); |
88e17b57 BE |
420 | if (mutex->owner != thread_id) |
421 | return -1; | |
422 | ||
423 | /* Decrement depth and return */ | |
424 | if (mutex->depth > 1) | |
425 | return --mutex->depth; | |
426 | ||
427 | /* Depth down to zero so we are no longer the owner */ | |
428 | mutex->depth = 0; | |
429 | mutex->owner = NULL; | |
430 | ||
431 | /* Have the backend unlock the mutex */ | |
88a2722e | 432 | status = __gthread_objc_mutex_unlock (mutex); |
88e17b57 BE |
433 | |
434 | /* Failed? */ | |
435 | if (status) | |
436 | return status; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | /* Frontend condition mutex functions */ | |
442 | ||
443 | /* | |
444 | Allocate a condition. Return the condition pointer if successful or NULL | |
445 | if the allocation failed for any reason. | |
446 | */ | |
447 | objc_condition_t | |
40165636 | 448 | objc_condition_allocate (void) |
88e17b57 BE |
449 | { |
450 | objc_condition_t condition; | |
451 | ||
452 | /* Allocate the condition mutex structure */ | |
40165636 RB |
453 | if (! (condition = |
454 | (objc_condition_t) objc_malloc (sizeof (struct objc_condition)))) | |
88e17b57 BE |
455 | return NULL; |
456 | ||
457 | /* Call the backend to create the condition mutex */ | |
88a2722e | 458 | if (__gthread_objc_condition_allocate (condition)) |
88e17b57 BE |
459 | { |
460 | /* failed! */ | |
40165636 | 461 | objc_free (condition); |
88e17b57 BE |
462 | return NULL; |
463 | } | |
464 | ||
465 | /* Success! */ | |
466 | return condition; | |
467 | } | |
468 | ||
469 | /* | |
470 | Deallocate a condition. Note that this includes an implicit | |
471 | condition_broadcast to insure that waiting threads have the opportunity | |
472 | to wake. It is legal to dealloc a condition only if no other | |
473 | thread is/will be using it. Here we do NOT check for other threads | |
474 | waiting but just wake them up. | |
475 | */ | |
476 | int | |
40165636 | 477 | objc_condition_deallocate (objc_condition_t condition) |
88e17b57 BE |
478 | { |
479 | /* Broadcast the condition */ | |
40165636 | 480 | if (objc_condition_broadcast (condition)) |
88e17b57 BE |
481 | return -1; |
482 | ||
483 | /* Call the backend to destroy */ | |
88a2722e | 484 | if (__gthread_objc_condition_deallocate (condition)) |
88e17b57 BE |
485 | return -1; |
486 | ||
487 | /* Free the condition mutex structure */ | |
40165636 | 488 | objc_free (condition); |
88e17b57 BE |
489 | |
490 | return 0; | |
491 | } | |
492 | ||
493 | /* | |
40165636 RB |
494 | Wait on the condition unlocking the mutex until objc_condition_signal () |
495 | or objc_condition_broadcast () are called for the same condition. The | |
88e17b57 BE |
496 | given mutex *must* have the depth set to 1 so that it can be unlocked |
497 | here, so that someone else can lock it and signal/broadcast the condition. | |
498 | The mutex is used to lock access to the shared data that make up the | |
499 | "condition" predicate. | |
500 | */ | |
501 | int | |
40165636 | 502 | objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) |
88e17b57 BE |
503 | { |
504 | objc_thread_t thread_id; | |
505 | ||
506 | /* Valid arguments? */ | |
40165636 | 507 | if (! mutex || ! condition) |
88e17b57 BE |
508 | return -1; |
509 | ||
510 | /* Make sure we are owner of mutex */ | |
88a2722e | 511 | thread_id = __gthread_objc_thread_id (); |
88e17b57 BE |
512 | if (mutex->owner != thread_id) |
513 | return -1; | |
514 | ||
515 | /* Cannot be locked more than once */ | |
516 | if (mutex->depth > 1) | |
517 | return -1; | |
518 | ||
519 | /* Virtually unlock the mutex */ | |
520 | mutex->depth = 0; | |
521 | mutex->owner = (objc_thread_t)NULL; | |
522 | ||
523 | /* Call the backend to wait */ | |
88a2722e | 524 | __gthread_objc_condition_wait (condition, mutex); |
88e17b57 BE |
525 | |
526 | /* Make ourselves owner of the mutex */ | |
527 | mutex->owner = thread_id; | |
528 | mutex->depth = 1; | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | /* | |
534 | Wake up all threads waiting on this condition. It is recommended that | |
535 | the called would lock the same mutex as the threads in objc_condition_wait | |
536 | before changing the "condition predicate" and make this call and unlock it | |
537 | right away after this call. | |
538 | */ | |
539 | int | |
40165636 | 540 | objc_condition_broadcast (objc_condition_t condition) |
88e17b57 BE |
541 | { |
542 | /* Valid condition mutex? */ | |
40165636 | 543 | if (! condition) |
88e17b57 BE |
544 | return -1; |
545 | ||
88a2722e | 546 | return __gthread_objc_condition_broadcast (condition); |
88e17b57 BE |
547 | } |
548 | ||
549 | /* | |
550 | Wake up one thread waiting on this condition. It is recommended that | |
551 | the called would lock the same mutex as the threads in objc_condition_wait | |
552 | before changing the "condition predicate" and make this call and unlock it | |
553 | right away after this call. | |
554 | */ | |
555 | int | |
40165636 | 556 | objc_condition_signal (objc_condition_t condition) |
88e17b57 BE |
557 | { |
558 | /* Valid condition mutex? */ | |
40165636 | 559 | if (! condition) |
88e17b57 BE |
560 | return -1; |
561 | ||
88a2722e | 562 | return __gthread_objc_condition_signal (condition); |
88e17b57 BE |
563 | } |
564 | ||
b894530e NP |
565 | /* Make the objc thread system aware that a thread which is managed |
566 | (started, stopped) by external code could access objc facilities | |
567 | from now on. This is used when you are interfacing with some | |
568 | external non-objc-based environment/system - you must call | |
40165636 | 569 | objc_thread_add () before an alien thread makes any calls to |
b894530e NP |
570 | Objective-C. Do not cause the _objc_became_multi_threaded hook to |
571 | be executed. */ | |
572 | void | |
40165636 | 573 | objc_thread_add (void) |
b894530e | 574 | { |
40165636 | 575 | objc_mutex_lock (__objc_runtime_mutex); |
b894530e NP |
576 | __objc_is_multi_threaded = 1; |
577 | __objc_runtime_threads_alive++; | |
40165636 | 578 | objc_mutex_unlock (__objc_runtime_mutex); |
b894530e NP |
579 | } |
580 | ||
581 | /* Make the objc thread system aware that a thread managed (started, | |
582 | stopped) by some external code will no longer access objc and thus | |
583 | can be forgotten by the objc thread system. Call | |
40165636 | 584 | objc_thread_remove () when your alien thread is done with making |
b894530e NP |
585 | calls to Objective-C. */ |
586 | void | |
40165636 | 587 | objc_thread_remove (void) |
b894530e | 588 | { |
40165636 | 589 | objc_mutex_lock (__objc_runtime_mutex); |
b894530e | 590 | __objc_runtime_threads_alive--; |
40165636 | 591 | objc_mutex_unlock (__objc_runtime_mutex); |
b894530e NP |
592 | } |
593 | ||
88e17b57 | 594 | /* End of File */ |