1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Thread Queue Operations |
---|
5 | * @ingroup ScoreThreadQ |
---|
6 | */ |
---|
7 | |
---|
8 | /* |
---|
9 | * COPYRIGHT (c) 1989-2014. |
---|
10 | * On-Line Applications Research Corporation (OAR). |
---|
11 | * |
---|
12 | * Copyright (c) 2015, 2016 embedded brains GmbH. |
---|
13 | * |
---|
14 | * The license and distribution terms for this file may be |
---|
15 | * found in the file LICENSE in this distribution or at |
---|
16 | * http://www.rtems.org/license/LICENSE. |
---|
17 | */ |
---|
18 | |
---|
19 | #if HAVE_CONFIG_H |
---|
20 | #include "config.h" |
---|
21 | #endif |
---|
22 | |
---|
23 | #include <rtems/score/threadqimpl.h> |
---|
24 | #include <rtems/score/assert.h> |
---|
25 | #include <rtems/score/threaddispatch.h> |
---|
26 | #include <rtems/score/threadimpl.h> |
---|
27 | #include <rtems/score/status.h> |
---|
28 | #include <rtems/score/watchdogimpl.h> |
---|
29 | |
---|
30 | #define THREAD_QUEUE_INTEND_TO_BLOCK \ |
---|
31 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_INTEND_TO_BLOCK) |
---|
32 | |
---|
33 | #define THREAD_QUEUE_BLOCKED \ |
---|
34 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_BLOCKED) |
---|
35 | |
---|
36 | #define THREAD_QUEUE_READY_AGAIN \ |
---|
37 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_READY_AGAIN) |
---|
38 | |
---|
39 | #if defined(RTEMS_SMP) |
---|
40 | /* |
---|
41 | * A global registry of active thread queue links is used to provide deadlock |
---|
42 | * detection on SMP configurations. This is simple to implement and no |
---|
43 | * additional storage is required for the thread queues. The disadvantage is |
---|
44 | * the global registry is not scalable and may lead to lock contention. |
---|
45 | * However, the registry is only used in case of nested resource conflicts. In |
---|
46 | * this case, the application is already in trouble. |
---|
47 | */ |
---|
48 | |
---|
49 | typedef struct { |
---|
50 | ISR_lock_Control Lock; |
---|
51 | |
---|
52 | RBTree_Control Links; |
---|
53 | } Thread_queue_Links; |
---|
54 | |
---|
55 | static Thread_queue_Links _Thread_queue_Links = { |
---|
56 | ISR_LOCK_INITIALIZER( "Thread Queue Links" ), |
---|
57 | RBTREE_INITIALIZER_EMPTY( _Thread_queue_Links.Links ) |
---|
58 | }; |
---|
59 | |
---|
60 | static bool _Thread_queue_Link_equal( |
---|
61 | const void *left, |
---|
62 | const RBTree_Node *right |
---|
63 | ) |
---|
64 | { |
---|
65 | const Thread_queue_Queue *the_left; |
---|
66 | const Thread_queue_Link *the_right; |
---|
67 | |
---|
68 | the_left = left; |
---|
69 | the_right = (Thread_queue_Link *) right; |
---|
70 | |
---|
71 | return the_left == the_right->source; |
---|
72 | } |
---|
73 | |
---|
74 | static bool _Thread_queue_Link_less( |
---|
75 | const void *left, |
---|
76 | const RBTree_Node *right |
---|
77 | ) |
---|
78 | { |
---|
79 | const Thread_queue_Queue *the_left; |
---|
80 | const Thread_queue_Link *the_right; |
---|
81 | |
---|
82 | the_left = left; |
---|
83 | the_right = (Thread_queue_Link *) right; |
---|
84 | |
---|
85 | return (uintptr_t) the_left < (uintptr_t) the_right->source; |
---|
86 | } |
---|
87 | |
---|
88 | static void *_Thread_queue_Link_map( RBTree_Node *node ) |
---|
89 | { |
---|
90 | return node; |
---|
91 | } |
---|
92 | |
---|
93 | static Thread_queue_Link *_Thread_queue_Link_find( |
---|
94 | Thread_queue_Links *links, |
---|
95 | Thread_queue_Queue *source |
---|
96 | ) |
---|
97 | { |
---|
98 | return _RBTree_Find_inline( |
---|
99 | &links->Links, |
---|
100 | source, |
---|
101 | _Thread_queue_Link_equal, |
---|
102 | _Thread_queue_Link_less, |
---|
103 | _Thread_queue_Link_map |
---|
104 | ); |
---|
105 | } |
---|
106 | |
---|
107 | static bool _Thread_queue_Link_add( |
---|
108 | Thread_queue_Link *link, |
---|
109 | Thread_queue_Queue *source, |
---|
110 | Thread_queue_Queue *target |
---|
111 | ) |
---|
112 | { |
---|
113 | Thread_queue_Links *links; |
---|
114 | Thread_queue_Queue *recursive_target; |
---|
115 | ISR_lock_Context lock_context; |
---|
116 | |
---|
117 | links = &_Thread_queue_Links; |
---|
118 | recursive_target = target; |
---|
119 | |
---|
120 | _ISR_lock_Acquire( &links->Lock, &lock_context ); |
---|
121 | |
---|
122 | while ( true ) { |
---|
123 | Thread_queue_Link *recursive_link; |
---|
124 | |
---|
125 | recursive_link = _Thread_queue_Link_find( links, recursive_target ); |
---|
126 | |
---|
127 | if ( recursive_link == NULL ) { |
---|
128 | break; |
---|
129 | } |
---|
130 | |
---|
131 | recursive_target = recursive_link->target; |
---|
132 | |
---|
133 | if ( recursive_target == source ) { |
---|
134 | _ISR_lock_Release( &links->Lock, &lock_context ); |
---|
135 | return false; |
---|
136 | } |
---|
137 | } |
---|
138 | |
---|
139 | link->source = source; |
---|
140 | link->target = target; |
---|
141 | _RBTree_Insert_inline( |
---|
142 | &links->Links, |
---|
143 | &link->Registry_node, |
---|
144 | source, |
---|
145 | _Thread_queue_Link_less |
---|
146 | ); |
---|
147 | |
---|
148 | _ISR_lock_Release( &links->Lock, &lock_context ); |
---|
149 | return true; |
---|
150 | } |
---|
151 | |
---|
152 | static void _Thread_queue_Link_remove( Thread_queue_Link *link ) |
---|
153 | { |
---|
154 | Thread_queue_Links *links; |
---|
155 | ISR_lock_Context lock_context; |
---|
156 | |
---|
157 | links = &_Thread_queue_Links; |
---|
158 | |
---|
159 | _ISR_lock_Acquire( &links->Lock, &lock_context ); |
---|
160 | _RBTree_Extract( &links->Links, &link->Registry_node ); |
---|
161 | _ISR_lock_Release( &links->Lock, &lock_context ); |
---|
162 | } |
---|
163 | #endif |
---|
164 | |
---|
165 | static void _Thread_queue_Path_release( Thread_queue_Path *path ) |
---|
166 | { |
---|
167 | #if defined(RTEMS_SMP) |
---|
168 | Chain_Node *head; |
---|
169 | Chain_Node *node; |
---|
170 | |
---|
171 | head = _Chain_Head( &path->Links ); |
---|
172 | node = _Chain_Last( &path->Links ); |
---|
173 | |
---|
174 | while ( head != node ) { |
---|
175 | Thread_queue_Link *link; |
---|
176 | |
---|
177 | link = RTEMS_CONTAINER_OF( node, Thread_queue_Link, Path_node ); |
---|
178 | |
---|
179 | if ( link->Queue_context.Wait.queue != NULL ) { |
---|
180 | _Thread_queue_Link_remove( link ); |
---|
181 | } |
---|
182 | |
---|
183 | _Thread_Wait_release_critical( link->owner, &link->Queue_context ); |
---|
184 | |
---|
185 | node = _Chain_Previous( node ); |
---|
186 | #if defined(RTEMS_DEBUG) |
---|
187 | _Chain_Set_off_chain( &link->Path_node ); |
---|
188 | #endif |
---|
189 | } |
---|
190 | #else |
---|
191 | (void) path; |
---|
192 | #endif |
---|
193 | } |
---|
194 | |
---|
195 | static bool _Thread_queue_Path_acquire( |
---|
196 | Thread_Control *the_thread, |
---|
197 | Thread_queue_Queue *queue, |
---|
198 | Thread_queue_Path *path |
---|
199 | ) |
---|
200 | { |
---|
201 | Thread_Control *owner; |
---|
202 | |
---|
203 | #if defined(RTEMS_SMP) |
---|
204 | Thread_queue_Link *link; |
---|
205 | Thread_queue_Queue *target; |
---|
206 | |
---|
207 | /* |
---|
208 | * For an overview please look at the non-SMP part below. We basically do |
---|
209 | * the same on SMP configurations. The fact that we may have more than one |
---|
210 | * executing thread and each thread queue has its own SMP lock makes the task |
---|
211 | * a bit more difficult. We have to avoid deadlocks at SMP lock level, since |
---|
212 | * this would result in an unrecoverable deadlock of the overall system. |
---|
213 | */ |
---|
214 | |
---|
215 | _Chain_Initialize_empty( &path->Links ); |
---|
216 | |
---|
217 | owner = queue->owner; |
---|
218 | |
---|
219 | if ( owner == NULL ) { |
---|
220 | return true; |
---|
221 | } |
---|
222 | |
---|
223 | if ( owner == the_thread ) { |
---|
224 | return false; |
---|
225 | } |
---|
226 | |
---|
227 | _Chain_Initialize_node( &path->Start.Path_node ); |
---|
228 | _Thread_queue_Context_initialize( &path->Start.Queue_context ); |
---|
229 | link = &path->Start; |
---|
230 | |
---|
231 | do { |
---|
232 | _Chain_Append_unprotected( &path->Links, &link->Path_node ); |
---|
233 | link->owner = owner; |
---|
234 | |
---|
235 | _Thread_Wait_acquire_default_critical( |
---|
236 | owner, |
---|
237 | &link->Queue_context.Lock_context |
---|
238 | ); |
---|
239 | |
---|
240 | target = owner->Wait.queue; |
---|
241 | link->Queue_context.Wait.queue = target; |
---|
242 | |
---|
243 | if ( target != NULL ) { |
---|
244 | if ( _Thread_queue_Link_add( link, queue, target ) ) { |
---|
245 | _Thread_queue_Gate_add( |
---|
246 | &owner->Wait.Lock.Pending_requests, |
---|
247 | &link->Queue_context.Wait.Gate |
---|
248 | ); |
---|
249 | _Thread_Wait_release_default_critical( |
---|
250 | owner, |
---|
251 | &link->Queue_context.Lock_context |
---|
252 | ); |
---|
253 | _Thread_Wait_acquire_queue_critical( target, &link->Queue_context ); |
---|
254 | |
---|
255 | if ( link->Queue_context.Wait.queue == NULL ) { |
---|
256 | _Thread_queue_Link_remove( link ); |
---|
257 | _Thread_Wait_release_queue_critical( target, &link->Queue_context ); |
---|
258 | _Thread_Wait_acquire_default_critical( |
---|
259 | owner, |
---|
260 | &link->Queue_context.Lock_context |
---|
261 | ); |
---|
262 | _Thread_Wait_remove_request_locked( owner, &link->Queue_context ); |
---|
263 | _Assert( owner->Wait.queue == NULL ); |
---|
264 | return true; |
---|
265 | } |
---|
266 | } else { |
---|
267 | link->Queue_context.Wait.queue = NULL; |
---|
268 | _Thread_queue_Path_release( path ); |
---|
269 | return false; |
---|
270 | } |
---|
271 | } else { |
---|
272 | return true; |
---|
273 | } |
---|
274 | |
---|
275 | link = &owner->Wait.Link; |
---|
276 | queue = target; |
---|
277 | owner = queue->owner; |
---|
278 | } while ( owner != NULL ); |
---|
279 | #else |
---|
280 | do { |
---|
281 | owner = queue->owner; |
---|
282 | |
---|
283 | if ( owner == NULL ) { |
---|
284 | return true; |
---|
285 | } |
---|
286 | |
---|
287 | if ( owner == the_thread ) { |
---|
288 | return false; |
---|
289 | } |
---|
290 | |
---|
291 | queue = owner->Wait.queue; |
---|
292 | } while ( queue != NULL ); |
---|
293 | #endif |
---|
294 | |
---|
295 | return true; |
---|
296 | } |
---|
297 | |
---|
298 | void _Thread_queue_Deadlock_status( Thread_Control *the_thread ) |
---|
299 | { |
---|
300 | the_thread->Wait.return_code = STATUS_DEADLOCK; |
---|
301 | } |
---|
302 | |
---|
303 | void _Thread_queue_Deadlock_fatal( Thread_Control *the_thread ) |
---|
304 | { |
---|
305 | _Terminate( |
---|
306 | INTERNAL_ERROR_CORE, |
---|
307 | false, |
---|
308 | INTERNAL_ERROR_THREAD_QUEUE_DEADLOCK |
---|
309 | ); |
---|
310 | } |
---|
311 | |
---|
312 | void _Thread_queue_Enqueue_critical( |
---|
313 | Thread_queue_Queue *queue, |
---|
314 | const Thread_queue_Operations *operations, |
---|
315 | Thread_Control *the_thread, |
---|
316 | States_Control state, |
---|
317 | Thread_queue_Context *queue_context |
---|
318 | ) |
---|
319 | { |
---|
320 | Thread_queue_Path path; |
---|
321 | Per_CPU_Control *cpu_self; |
---|
322 | bool success; |
---|
323 | |
---|
324 | #if defined(RTEMS_MULTIPROCESSING) |
---|
325 | if ( _Thread_MP_Is_receive( the_thread ) && the_thread->receive_packet ) { |
---|
326 | the_thread = _Thread_MP_Allocate_proxy( state ); |
---|
327 | } |
---|
328 | #endif |
---|
329 | |
---|
330 | _Thread_Wait_claim( the_thread, queue, operations ); |
---|
331 | |
---|
332 | if ( !_Thread_queue_Path_acquire( the_thread, queue, &path ) ) { |
---|
333 | _Thread_Wait_restore_default( the_thread ); |
---|
334 | _Thread_queue_Queue_release( queue, &queue_context->Lock_context ); |
---|
335 | _Thread_Wait_tranquilize( the_thread ); |
---|
336 | ( *queue_context->deadlock_callout )( the_thread ); |
---|
337 | return; |
---|
338 | } |
---|
339 | |
---|
340 | ( *operations->enqueue )( queue, the_thread, &path ); |
---|
341 | |
---|
342 | _Thread_queue_Path_release( &path ); |
---|
343 | |
---|
344 | the_thread->Wait.return_code = STATUS_SUCCESSFUL; |
---|
345 | _Thread_Wait_flags_set( the_thread, THREAD_QUEUE_INTEND_TO_BLOCK ); |
---|
346 | cpu_self = _Thread_Dispatch_disable_critical( &queue_context->Lock_context ); |
---|
347 | _Thread_queue_Queue_release( queue, &queue_context->Lock_context ); |
---|
348 | |
---|
349 | if ( |
---|
350 | cpu_self->thread_dispatch_disable_level |
---|
351 | != queue_context->expected_thread_dispatch_disable_level |
---|
352 | ) { |
---|
353 | _Terminate( |
---|
354 | INTERNAL_ERROR_CORE, |
---|
355 | false, |
---|
356 | INTERNAL_ERROR_THREAD_QUEUE_ENQUEUE_FROM_BAD_STATE |
---|
357 | ); |
---|
358 | } |
---|
359 | |
---|
360 | /* |
---|
361 | * Set the blocking state for this thread queue in the thread. |
---|
362 | */ |
---|
363 | _Thread_Set_state( the_thread, state ); |
---|
364 | |
---|
365 | /* |
---|
366 | * If the thread wants to timeout, then schedule its timer. |
---|
367 | */ |
---|
368 | switch ( queue_context->timeout_discipline ) { |
---|
369 | case WATCHDOG_RELATIVE: |
---|
370 | /* A relative timeout of 0 is a special case indefinite (no) timeout */ |
---|
371 | if ( queue_context->timeout != 0 ) { |
---|
372 | _Thread_Timer_insert_relative( |
---|
373 | the_thread, |
---|
374 | cpu_self, |
---|
375 | _Thread_Timeout, |
---|
376 | (Watchdog_Interval) queue_context->timeout |
---|
377 | ); |
---|
378 | } |
---|
379 | break; |
---|
380 | case WATCHDOG_ABSOLUTE: |
---|
381 | _Thread_Timer_insert_absolute( |
---|
382 | the_thread, |
---|
383 | cpu_self, |
---|
384 | _Thread_Timeout, |
---|
385 | queue_context->timeout |
---|
386 | ); |
---|
387 | break; |
---|
388 | default: |
---|
389 | break; |
---|
390 | } |
---|
391 | |
---|
392 | /* |
---|
393 | * At this point thread dispatching is disabled, however, we already released |
---|
394 | * the thread queue lock. Thus, interrupts or threads on other processors |
---|
395 | * may already changed our state with respect to the thread queue object. |
---|
396 | * The request could be satisfied or timed out. This situation is indicated |
---|
397 | * by the thread wait flags. Other parties must not modify our thread state |
---|
398 | * as long as we are in the THREAD_QUEUE_INTEND_TO_BLOCK thread wait state, |
---|
399 | * thus we have to cancel the blocking operation ourself if necessary. |
---|
400 | */ |
---|
401 | success = _Thread_Wait_flags_try_change_acquire( |
---|
402 | the_thread, |
---|
403 | THREAD_QUEUE_INTEND_TO_BLOCK, |
---|
404 | THREAD_QUEUE_BLOCKED |
---|
405 | ); |
---|
406 | if ( !success ) { |
---|
407 | _Thread_Remove_timer_and_unblock( the_thread, queue ); |
---|
408 | } |
---|
409 | |
---|
410 | _Thread_Update_priority( path.update_priority ); |
---|
411 | _Thread_Dispatch_enable( cpu_self ); |
---|
412 | } |
---|
413 | |
---|
414 | bool _Thread_queue_Do_extract_locked( |
---|
415 | Thread_queue_Queue *queue, |
---|
416 | const Thread_queue_Operations *operations, |
---|
417 | Thread_Control *the_thread |
---|
418 | #if defined(RTEMS_MULTIPROCESSING) |
---|
419 | , |
---|
420 | const Thread_queue_Context *queue_context |
---|
421 | #endif |
---|
422 | ) |
---|
423 | { |
---|
424 | bool success; |
---|
425 | bool unblock; |
---|
426 | |
---|
427 | #if defined(RTEMS_MULTIPROCESSING) |
---|
428 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
---|
429 | Thread_Proxy_control *the_proxy; |
---|
430 | Thread_queue_MP_callout mp_callout; |
---|
431 | |
---|
432 | the_proxy = (Thread_Proxy_control *) the_thread; |
---|
433 | mp_callout = queue_context->mp_callout; |
---|
434 | _Assert( mp_callout != NULL ); |
---|
435 | the_proxy->thread_queue_callout = queue_context->mp_callout; |
---|
436 | } |
---|
437 | #endif |
---|
438 | |
---|
439 | ( *operations->extract )( queue, the_thread ); |
---|
440 | |
---|
441 | /* |
---|
442 | * We must update the wait flags under protection of the current thread lock, |
---|
443 | * otherwise a _Thread_Timeout() running on another processor may interfere. |
---|
444 | */ |
---|
445 | success = _Thread_Wait_flags_try_change_release( |
---|
446 | the_thread, |
---|
447 | THREAD_QUEUE_INTEND_TO_BLOCK, |
---|
448 | THREAD_QUEUE_READY_AGAIN |
---|
449 | ); |
---|
450 | if ( success ) { |
---|
451 | unblock = false; |
---|
452 | } else { |
---|
453 | _Assert( _Thread_Wait_flags_get( the_thread ) == THREAD_QUEUE_BLOCKED ); |
---|
454 | _Thread_Wait_flags_set( the_thread, THREAD_QUEUE_READY_AGAIN ); |
---|
455 | unblock = true; |
---|
456 | } |
---|
457 | |
---|
458 | _Thread_Wait_restore_default( the_thread ); |
---|
459 | |
---|
460 | return unblock; |
---|
461 | } |
---|
462 | |
---|
463 | void _Thread_queue_Unblock_critical( |
---|
464 | bool unblock, |
---|
465 | Thread_queue_Queue *queue, |
---|
466 | Thread_Control *the_thread, |
---|
467 | ISR_lock_Context *lock_context |
---|
468 | ) |
---|
469 | { |
---|
470 | if ( unblock ) { |
---|
471 | Per_CPU_Control *cpu_self; |
---|
472 | |
---|
473 | cpu_self = _Thread_Dispatch_disable_critical( lock_context ); |
---|
474 | _Thread_queue_Queue_release( queue, lock_context ); |
---|
475 | |
---|
476 | _Thread_Remove_timer_and_unblock( the_thread, queue ); |
---|
477 | |
---|
478 | _Thread_Dispatch_enable( cpu_self ); |
---|
479 | } else { |
---|
480 | _Thread_queue_Queue_release( queue, lock_context ); |
---|
481 | } |
---|
482 | } |
---|
483 | |
---|
484 | void _Thread_queue_Extract_critical( |
---|
485 | Thread_queue_Queue *queue, |
---|
486 | const Thread_queue_Operations *operations, |
---|
487 | Thread_Control *the_thread, |
---|
488 | Thread_queue_Context *queue_context |
---|
489 | ) |
---|
490 | { |
---|
491 | bool unblock; |
---|
492 | |
---|
493 | unblock = _Thread_queue_Extract_locked( |
---|
494 | queue, |
---|
495 | operations, |
---|
496 | the_thread, |
---|
497 | queue_context |
---|
498 | ); |
---|
499 | |
---|
500 | _Thread_queue_Unblock_critical( |
---|
501 | unblock, |
---|
502 | queue, |
---|
503 | the_thread, |
---|
504 | &queue_context->Lock_context |
---|
505 | ); |
---|
506 | } |
---|
507 | |
---|
508 | void _Thread_queue_Extract( Thread_Control *the_thread ) |
---|
509 | { |
---|
510 | Thread_queue_Context queue_context; |
---|
511 | Thread_queue_Queue *queue; |
---|
512 | |
---|
513 | _Thread_queue_Context_initialize( &queue_context ); |
---|
514 | _Thread_Wait_acquire( the_thread, &queue_context ); |
---|
515 | |
---|
516 | queue = the_thread->Wait.queue; |
---|
517 | |
---|
518 | if ( queue != NULL ) { |
---|
519 | bool unblock; |
---|
520 | |
---|
521 | _Thread_Wait_remove_request( the_thread, &queue_context ); |
---|
522 | _Thread_queue_Context_set_MP_callout( |
---|
523 | &queue_context, |
---|
524 | _Thread_queue_MP_callout_do_nothing |
---|
525 | ); |
---|
526 | unblock = _Thread_queue_Extract_locked( |
---|
527 | queue, |
---|
528 | the_thread->Wait.operations, |
---|
529 | the_thread, |
---|
530 | &queue_context.Lock_context |
---|
531 | ); |
---|
532 | _Thread_queue_Unblock_critical( |
---|
533 | unblock, |
---|
534 | queue, |
---|
535 | the_thread, |
---|
536 | &queue_context.Lock_context |
---|
537 | ); |
---|
538 | } else { |
---|
539 | _Thread_Wait_release( the_thread, &queue_context ); |
---|
540 | } |
---|
541 | } |
---|
542 | |
---|
543 | Thread_Control *_Thread_queue_Do_dequeue( |
---|
544 | Thread_queue_Control *the_thread_queue, |
---|
545 | const Thread_queue_Operations *operations |
---|
546 | #if defined(RTEMS_MULTIPROCESSING) |
---|
547 | , |
---|
548 | Thread_queue_MP_callout mp_callout |
---|
549 | #endif |
---|
550 | ) |
---|
551 | { |
---|
552 | Thread_queue_Context queue_context; |
---|
553 | Thread_Control *the_thread; |
---|
554 | |
---|
555 | _Thread_queue_Context_initialize( &queue_context ); |
---|
556 | _Thread_queue_Context_set_MP_callout( &queue_context, mp_callout ); |
---|
557 | _Thread_queue_Acquire( the_thread_queue, &queue_context.Lock_context ); |
---|
558 | |
---|
559 | the_thread = _Thread_queue_First_locked( the_thread_queue, operations ); |
---|
560 | |
---|
561 | if ( the_thread != NULL ) { |
---|
562 | _Thread_queue_Extract_critical( |
---|
563 | &the_thread_queue->Queue, |
---|
564 | operations, |
---|
565 | the_thread, |
---|
566 | &queue_context |
---|
567 | ); |
---|
568 | } else { |
---|
569 | _Thread_queue_Release( the_thread_queue, &queue_context.Lock_context ); |
---|
570 | } |
---|
571 | |
---|
572 | return the_thread; |
---|
573 | } |
---|
574 | |
---|
575 | #if defined(RTEMS_MULTIPROCESSING) |
---|
576 | void _Thread_queue_Unblock_proxy( |
---|
577 | Thread_queue_Queue *queue, |
---|
578 | Thread_Control *the_thread |
---|
579 | ) |
---|
580 | { |
---|
581 | const Thread_queue_Object *the_queue_object; |
---|
582 | Thread_Proxy_control *the_proxy; |
---|
583 | Thread_queue_MP_callout mp_callout; |
---|
584 | |
---|
585 | the_queue_object = THREAD_QUEUE_QUEUE_TO_OBJECT( queue ); |
---|
586 | the_proxy = (Thread_Proxy_control *) the_thread; |
---|
587 | mp_callout = the_proxy->thread_queue_callout; |
---|
588 | ( *mp_callout )( the_thread, the_queue_object->Object.id ); |
---|
589 | |
---|
590 | _Thread_MP_Free_proxy( the_thread ); |
---|
591 | } |
---|
592 | #endif |
---|