1 | /** |
---|
2 | * @file rtems/score/threadq.h |
---|
3 | * |
---|
4 | * Constants and Structures Associated with the Manipulation of Objects |
---|
5 | * |
---|
6 | * This include file contains all the constants and structures associated |
---|
7 | * with the manipulation of objects. |
---|
8 | */ |
---|
9 | |
---|
10 | /* |
---|
11 | * COPYRIGHT (c) 1989-2014. |
---|
12 | * On-Line Applications Research Corporation (OAR). |
---|
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 | #ifndef _RTEMS_SCORE_THREADQIMPL_H |
---|
20 | #define _RTEMS_SCORE_THREADQIMPL_H |
---|
21 | |
---|
22 | #include <rtems/score/threadq.h> |
---|
23 | #include <rtems/score/chainimpl.h> |
---|
24 | #include <rtems/score/rbtreeimpl.h> |
---|
25 | #include <rtems/score/scheduler.h> |
---|
26 | #include <rtems/score/smp.h> |
---|
27 | #include <rtems/score/thread.h> |
---|
28 | |
---|
29 | #ifdef __cplusplus |
---|
30 | extern "C" { |
---|
31 | #endif |
---|
32 | |
---|
33 | /** |
---|
34 | * @addtogroup ScoreThreadQueue |
---|
35 | */ |
---|
36 | /**@{*/ |
---|
37 | |
---|
38 | /** |
---|
39 | * @brief Thread queue with a layout compatible to struct _Thread_queue_Queue |
---|
40 | * defined in Newlib <sys/lock.h>. |
---|
41 | */ |
---|
42 | typedef struct { |
---|
43 | Thread_queue_Queue Queue; |
---|
44 | |
---|
45 | #if !defined(RTEMS_SMP) |
---|
46 | /* |
---|
47 | * The struct _Thread_queue_Queue definition is independent of the RTEMS |
---|
48 | * build configuration. Thus, the storage space for the SMP lock is always |
---|
49 | * present. In SMP configurations, the SMP lock is contained in the |
---|
50 | * Thread_queue_Queue. |
---|
51 | */ |
---|
52 | unsigned int reserved[2]; |
---|
53 | #endif |
---|
54 | } Thread_queue_Syslock_queue; |
---|
55 | |
---|
56 | RTEMS_INLINE_ROUTINE void _Thread_queue_Do_context_initialize( |
---|
57 | Thread_queue_Context *queue_context |
---|
58 | #if defined(RTEMS_MULTIPROCESSING) |
---|
59 | , |
---|
60 | Thread_queue_MP_callout mp_callout |
---|
61 | #endif |
---|
62 | ) |
---|
63 | { |
---|
64 | #if defined(RTEMS_MULTIPROCESSING) |
---|
65 | queue_context->mp_callout = mp_callout; |
---|
66 | #else |
---|
67 | (void) queue_context; |
---|
68 | #endif |
---|
69 | } |
---|
70 | |
---|
71 | /** |
---|
72 | * @brief Initializes a thread queue context. |
---|
73 | * |
---|
74 | * @param queue_context The thread queue context to initialize. |
---|
75 | * @param mp_callout Callout to unblock the thread in case it is actually a |
---|
76 | * thread proxy. This parameter is only used on multiprocessing |
---|
77 | * configurations. Used by thread queue extract and unblock methods for |
---|
78 | * objects with multiprocessing (MP) support. |
---|
79 | */ |
---|
80 | #if defined(RTEMS_MULTIPROCESSING) |
---|
81 | #define _Thread_queue_Context_initialize( \ |
---|
82 | queue_context, \ |
---|
83 | mp_callout \ |
---|
84 | ) \ |
---|
85 | _Thread_queue_Do_context_initialize( \ |
---|
86 | queue_context, \ |
---|
87 | mp_callout \ |
---|
88 | ) |
---|
89 | #else |
---|
90 | #define _Thread_queue_Context_initialize( \ |
---|
91 | queue_context, \ |
---|
92 | mp_callout \ |
---|
93 | ) \ |
---|
94 | _Thread_queue_Do_context_initialize( \ |
---|
95 | queue_context \ |
---|
96 | ) |
---|
97 | #endif |
---|
98 | |
---|
99 | RTEMS_INLINE_ROUTINE void _Thread_queue_Heads_initialize( |
---|
100 | Thread_queue_Heads *heads |
---|
101 | ) |
---|
102 | { |
---|
103 | #if defined(RTEMS_SMP) |
---|
104 | size_t i; |
---|
105 | |
---|
106 | for ( i = 0; i < _Scheduler_Count; ++i ) { |
---|
107 | _RBTree_Initialize_empty( &heads->Priority[ i ].Queue ); |
---|
108 | } |
---|
109 | #endif |
---|
110 | |
---|
111 | _Chain_Initialize_empty( &heads->Free_chain ); |
---|
112 | } |
---|
113 | |
---|
114 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_initialize( |
---|
115 | Thread_queue_Queue *queue |
---|
116 | ) |
---|
117 | { |
---|
118 | queue->heads = NULL; |
---|
119 | #if defined(RTEMS_SMP) |
---|
120 | _SMP_ticket_lock_Initialize( &queue->Lock ); |
---|
121 | #endif |
---|
122 | } |
---|
123 | |
---|
124 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_do_acquire_critical( |
---|
125 | Thread_queue_Queue *queue, |
---|
126 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
---|
127 | SMP_lock_Stats *lock_stats, |
---|
128 | #endif |
---|
129 | ISR_lock_Context *lock_context |
---|
130 | ) |
---|
131 | { |
---|
132 | #if defined(RTEMS_SMP) |
---|
133 | _SMP_ticket_lock_Acquire( |
---|
134 | &queue->Lock, |
---|
135 | lock_stats, |
---|
136 | &lock_context->Lock_context.Stats_context |
---|
137 | ); |
---|
138 | #else |
---|
139 | (void) queue; |
---|
140 | (void) lock_context; |
---|
141 | #endif |
---|
142 | } |
---|
143 | |
---|
144 | #if defined(RTEMS_SMP) && defined( RTEMS_PROFILING ) |
---|
145 | #define \ |
---|
146 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
---|
147 | _Thread_queue_Queue_do_acquire_critical( queue, lock_stats, lock_context ) |
---|
148 | #else |
---|
149 | #define \ |
---|
150 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
---|
151 | _Thread_queue_Queue_do_acquire_critical( queue, lock_context ) |
---|
152 | #endif |
---|
153 | |
---|
154 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_release_critical( |
---|
155 | Thread_queue_Queue *queue, |
---|
156 | ISR_lock_Context *lock_context |
---|
157 | ) |
---|
158 | { |
---|
159 | #if defined(RTEMS_SMP) |
---|
160 | _SMP_ticket_lock_Release( |
---|
161 | &queue->Lock, |
---|
162 | &lock_context->Lock_context.Stats_context |
---|
163 | ); |
---|
164 | #else |
---|
165 | (void) queue; |
---|
166 | (void) lock_context; |
---|
167 | #endif |
---|
168 | } |
---|
169 | |
---|
170 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_release( |
---|
171 | Thread_queue_Queue *queue, |
---|
172 | ISR_lock_Context *lock_context |
---|
173 | ) |
---|
174 | { |
---|
175 | _Thread_queue_Queue_release_critical( queue, lock_context ); |
---|
176 | _ISR_lock_ISR_enable( lock_context ); |
---|
177 | } |
---|
178 | |
---|
179 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire_critical( |
---|
180 | Thread_queue_Control *the_thread_queue, |
---|
181 | ISR_lock_Context *lock_context |
---|
182 | ) |
---|
183 | { |
---|
184 | _Thread_queue_Queue_acquire_critical( |
---|
185 | &the_thread_queue->Queue, |
---|
186 | &the_thread_queue->Lock_stats, |
---|
187 | lock_context |
---|
188 | ); |
---|
189 | #if defined(RTEMS_DEBUG) && defined(RTEMS_SMP) |
---|
190 | the_thread_queue->owner = _SMP_Get_current_processor(); |
---|
191 | #endif |
---|
192 | } |
---|
193 | |
---|
194 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire( |
---|
195 | Thread_queue_Control *the_thread_queue, |
---|
196 | ISR_lock_Context *lock_context |
---|
197 | ) |
---|
198 | { |
---|
199 | _ISR_lock_ISR_disable( lock_context ); |
---|
200 | _Thread_queue_Acquire_critical( the_thread_queue, lock_context ); |
---|
201 | } |
---|
202 | |
---|
203 | #if defined(RTEMS_DEBUG) |
---|
204 | RTEMS_INLINE_ROUTINE bool _Thread_queue_Is_lock_owner( |
---|
205 | const Thread_queue_Control *the_thread_queue |
---|
206 | ) |
---|
207 | { |
---|
208 | #if defined(RTEMS_SMP) |
---|
209 | return the_thread_queue->owner == _SMP_Get_current_processor(); |
---|
210 | #else |
---|
211 | return _ISR_Get_level() != 0; |
---|
212 | #endif |
---|
213 | } |
---|
214 | #endif |
---|
215 | |
---|
216 | RTEMS_INLINE_ROUTINE void _Thread_queue_Release_critical( |
---|
217 | Thread_queue_Control *the_thread_queue, |
---|
218 | ISR_lock_Context *lock_context |
---|
219 | ) |
---|
220 | { |
---|
221 | #if defined(RTEMS_DEBUG) |
---|
222 | _Assert( _Thread_queue_Is_lock_owner( the_thread_queue ) ); |
---|
223 | #if defined(RTEMS_SMP) |
---|
224 | the_thread_queue->owner = SMP_LOCK_NO_OWNER; |
---|
225 | #endif |
---|
226 | #endif |
---|
227 | _Thread_queue_Queue_release_critical( |
---|
228 | &the_thread_queue->Queue, |
---|
229 | lock_context |
---|
230 | ); |
---|
231 | } |
---|
232 | |
---|
233 | RTEMS_INLINE_ROUTINE void _Thread_queue_Release( |
---|
234 | Thread_queue_Control *the_thread_queue, |
---|
235 | ISR_lock_Context *lock_context |
---|
236 | ) |
---|
237 | { |
---|
238 | _Thread_queue_Release_critical( the_thread_queue, lock_context ); |
---|
239 | _ISR_lock_ISR_enable( lock_context ); |
---|
240 | } |
---|
241 | |
---|
242 | Thread_Control *_Thread_queue_Do_dequeue( |
---|
243 | Thread_queue_Control *the_thread_queue, |
---|
244 | const Thread_queue_Operations *operations |
---|
245 | #if defined(RTEMS_MULTIPROCESSING) |
---|
246 | , |
---|
247 | Thread_queue_MP_callout mp_callout |
---|
248 | #endif |
---|
249 | ); |
---|
250 | |
---|
251 | /** |
---|
252 | * @brief Gets a pointer to a thread waiting on the_thread_queue. |
---|
253 | * |
---|
254 | * This function returns a pointer to a thread waiting on |
---|
255 | * the_thread_queue. The selection of this thread is based on |
---|
256 | * the discipline of the_thread_queue. If no threads are waiting |
---|
257 | * on the_thread_queue, then NULL is returned. |
---|
258 | * |
---|
259 | * - INTERRUPT LATENCY: |
---|
260 | * + single case |
---|
261 | */ |
---|
262 | #if defined(RTEMS_MULTIPROCESSING) |
---|
263 | #define _Thread_queue_Dequeue( \ |
---|
264 | the_thread_queue, \ |
---|
265 | operations, \ |
---|
266 | mp_callout \ |
---|
267 | ) \ |
---|
268 | _Thread_queue_Do_dequeue( \ |
---|
269 | the_thread_queue, \ |
---|
270 | operations, \ |
---|
271 | mp_callout \ |
---|
272 | ) |
---|
273 | #else |
---|
274 | #define _Thread_queue_Dequeue( \ |
---|
275 | the_thread_queue, \ |
---|
276 | operations, \ |
---|
277 | mp_callout \ |
---|
278 | ) \ |
---|
279 | _Thread_queue_Do_dequeue( \ |
---|
280 | the_thread_queue, \ |
---|
281 | operations \ |
---|
282 | ) |
---|
283 | #endif |
---|
284 | |
---|
285 | /** |
---|
286 | * @brief Blocks the thread and places it on the thread queue. |
---|
287 | * |
---|
288 | * This enqueues the thread on the thread queue, blocks the thread, and |
---|
289 | * optionally starts the thread timer in case the timeout interval is not |
---|
290 | * WATCHDOG_NO_TIMEOUT. |
---|
291 | * |
---|
292 | * The caller must be the owner of the thread queue lock. This function will |
---|
293 | * release the thread queue lock and register it as the new thread lock. |
---|
294 | * Thread dispatching is disabled before the thread queue lock is released. |
---|
295 | * Thread dispatching is enabled once the sequence to block the thread is |
---|
296 | * complete. The operation to enqueue the thread on the queue is protected by |
---|
297 | * the thread queue lock. This makes it possible to use the thread queue lock |
---|
298 | * to protect the state of objects embedding the thread queue and directly |
---|
299 | * enter _Thread_queue_Enqueue_critical() in case the thread must block. |
---|
300 | * |
---|
301 | * @code |
---|
302 | * #include <rtems/score/threadqimpl.h> |
---|
303 | * #include <rtems/score/statesimpl.h> |
---|
304 | * |
---|
305 | * #define MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority |
---|
306 | * |
---|
307 | * typedef struct { |
---|
308 | * Thread_queue_Control Queue; |
---|
309 | * Thread_Control *owner; |
---|
310 | * } Mutex; |
---|
311 | * |
---|
312 | * void _Mutex_Obtain( Mutex *mutex ) |
---|
313 | * { |
---|
314 | * ISR_lock_Context lock_context; |
---|
315 | * Thread_Control *executing; |
---|
316 | * |
---|
317 | * _Thread_queue_Acquire( &mutex->Queue, &lock_context ); |
---|
318 | * |
---|
319 | * executing = _Thread_Executing; |
---|
320 | * |
---|
321 | * if ( mutex->owner == NULL ) { |
---|
322 | * mutex->owner = executing; |
---|
323 | * _Thread_queue_Release( &mutex->Queue, &lock_context ); |
---|
324 | * } else { |
---|
325 | * _Thread_queue_Enqueue_critical( |
---|
326 | * &mutex->Queue.Queue, |
---|
327 | * MUTEX_TQ_OPERATIONS, |
---|
328 | * executing, |
---|
329 | * STATES_WAITING_FOR_MUTEX, |
---|
330 | * WATCHDOG_NO_TIMEOUT, |
---|
331 | * 0, |
---|
332 | * &lock_context |
---|
333 | * ); |
---|
334 | * } |
---|
335 | * } |
---|
336 | * @endcode |
---|
337 | * |
---|
338 | * @param[in] queue The actual thread queue. |
---|
339 | * @param[in] operations The thread queue operations. |
---|
340 | * @param[in] the_thread The thread to enqueue. |
---|
341 | * @param[in] state The new state of the thread. |
---|
342 | * @param[in] timeout Interval to wait. Use WATCHDOG_NO_TIMEOUT to block |
---|
343 | * potentially forever. |
---|
344 | * @param[in] lock_context The lock context of the lock acquire. |
---|
345 | */ |
---|
346 | void _Thread_queue_Enqueue_critical( |
---|
347 | Thread_queue_Queue *queue, |
---|
348 | const Thread_queue_Operations *operations, |
---|
349 | Thread_Control *the_thread, |
---|
350 | States_Control state, |
---|
351 | Watchdog_Interval timeout, |
---|
352 | ISR_lock_Context *lock_context |
---|
353 | ); |
---|
354 | |
---|
355 | /** |
---|
356 | * @brief Acquires the thread queue lock and calls |
---|
357 | * _Thread_queue_Enqueue_critical(). |
---|
358 | */ |
---|
359 | RTEMS_INLINE_ROUTINE void _Thread_queue_Enqueue( |
---|
360 | Thread_queue_Control *the_thread_queue, |
---|
361 | const Thread_queue_Operations *operations, |
---|
362 | Thread_Control *the_thread, |
---|
363 | States_Control state, |
---|
364 | Watchdog_Interval timeout |
---|
365 | ) |
---|
366 | { |
---|
367 | ISR_lock_Context lock_context; |
---|
368 | |
---|
369 | _Thread_queue_Acquire( the_thread_queue, &lock_context ); |
---|
370 | _Thread_queue_Enqueue_critical( |
---|
371 | &the_thread_queue->Queue, |
---|
372 | operations, |
---|
373 | the_thread, |
---|
374 | state, |
---|
375 | timeout, |
---|
376 | &lock_context |
---|
377 | ); |
---|
378 | } |
---|
379 | |
---|
380 | bool _Thread_queue_Do_extract_locked( |
---|
381 | Thread_queue_Queue *queue, |
---|
382 | const Thread_queue_Operations *operations, |
---|
383 | Thread_Control *the_thread |
---|
384 | #if defined(RTEMS_MULTIPROCESSING) |
---|
385 | , |
---|
386 | const Thread_queue_Context *queue_context |
---|
387 | #endif |
---|
388 | ); |
---|
389 | |
---|
390 | /** |
---|
391 | * @brief Extracts the thread from the thread queue, restores the default wait |
---|
392 | * operations and restores the default thread lock. |
---|
393 | * |
---|
394 | * The caller must be the owner of the thread queue lock. The thread queue |
---|
395 | * lock is not released. |
---|
396 | * |
---|
397 | * @param[in] queue The actual thread queue. |
---|
398 | * @param[in] operations The thread queue operations. |
---|
399 | * @param[in] the_thread The thread to extract. |
---|
400 | * @param[in] queue_context The thread queue context. This parameter is only |
---|
401 | * used on multiprocessing configurations. |
---|
402 | * |
---|
403 | * @return Returns the unblock indicator for _Thread_queue_Unblock_critical(). |
---|
404 | * True indicates, that this thread must be unblocked by the scheduler later in |
---|
405 | * _Thread_queue_Unblock_critical(), and false otherwise. In case false is |
---|
406 | * returned, then the thread queue enqueue procedure was interrupted. Thus it |
---|
407 | * will unblock itself and the thread wait information is no longer accessible, |
---|
408 | * since this thread may already block on another resource in an SMP |
---|
409 | * configuration. |
---|
410 | */ |
---|
411 | #if defined(RTEMS_MULTIPROCESSING) |
---|
412 | #define _Thread_queue_Extract_locked( \ |
---|
413 | unblock, \ |
---|
414 | queue, \ |
---|
415 | the_thread, \ |
---|
416 | queue_context \ |
---|
417 | ) \ |
---|
418 | _Thread_queue_Do_extract_locked( \ |
---|
419 | unblock, \ |
---|
420 | queue, \ |
---|
421 | the_thread, \ |
---|
422 | queue_context \ |
---|
423 | ) |
---|
424 | #else |
---|
425 | #define _Thread_queue_Extract_locked( \ |
---|
426 | unblock, \ |
---|
427 | queue, \ |
---|
428 | the_thread, \ |
---|
429 | queue_context \ |
---|
430 | ) \ |
---|
431 | _Thread_queue_Do_extract_locked( \ |
---|
432 | unblock, \ |
---|
433 | queue, \ |
---|
434 | the_thread \ |
---|
435 | ) |
---|
436 | #endif |
---|
437 | |
---|
438 | /** |
---|
439 | * @brief Unblocks the thread which was on the thread queue before. |
---|
440 | * |
---|
441 | * The caller must be the owner of the thread queue lock. This function will |
---|
442 | * release the thread queue lock. Thread dispatching is disabled before the |
---|
443 | * thread queue lock is released and an unblock is necessary. Thread |
---|
444 | * dispatching is enabled once the sequence to unblock the thread is complete. |
---|
445 | * |
---|
446 | * @param[in] unblock The unblock indicator returned by |
---|
447 | * _Thread_queue_Extract_locked(). |
---|
448 | * @param[in] queue The actual thread queue. |
---|
449 | * @param[in] the_thread The thread to extract. |
---|
450 | * @param[in] lock_context The lock context of the lock acquire. |
---|
451 | */ |
---|
452 | void _Thread_queue_Unblock_critical( |
---|
453 | bool unblock, |
---|
454 | Thread_queue_Queue *queue, |
---|
455 | Thread_Control *the_thread, |
---|
456 | ISR_lock_Context *lock_context |
---|
457 | ); |
---|
458 | |
---|
459 | /** |
---|
460 | * @brief Extracts the thread from the thread queue and unblocks it. |
---|
461 | * |
---|
462 | * The caller must be the owner of the thread queue lock. This function will |
---|
463 | * release the thread queue lock and restore the default thread lock. Thread |
---|
464 | * dispatching is disabled before the thread queue lock is released and an |
---|
465 | * unblock is necessary. Thread dispatching is enabled once the sequence to |
---|
466 | * unblock the thread is complete. This makes it possible to use the thread |
---|
467 | * queue lock to protect the state of objects embedding the thread queue and |
---|
468 | * directly enter _Thread_queue_Extract_critical() to finalize an operation in |
---|
469 | * case a waiting thread exists. |
---|
470 | * |
---|
471 | * @code |
---|
472 | * #include <rtems/score/threadqimpl.h> |
---|
473 | * |
---|
474 | * typedef struct { |
---|
475 | * Thread_queue_Control Queue; |
---|
476 | * Thread_Control *owner; |
---|
477 | * } Mutex; |
---|
478 | * |
---|
479 | * void _Mutex_Release( Mutex *mutex ) |
---|
480 | * { |
---|
481 | * Thread_queue_Context queue_context; |
---|
482 | * Thread_Control *first; |
---|
483 | * |
---|
484 | * _Thread_queue_Context_initialize( &queue_context, NULL ); |
---|
485 | * _Thread_queue_Acquire( &mutex->Queue, &queue_context.Lock_context ); |
---|
486 | * |
---|
487 | * first = _Thread_queue_First_locked( &mutex->Queue ); |
---|
488 | * mutex->owner = first; |
---|
489 | * |
---|
490 | * if ( first != NULL ) { |
---|
491 | * _Thread_queue_Extract_critical( |
---|
492 | * &mutex->Queue.Queue, |
---|
493 | * mutex->Queue.operations, |
---|
494 | * first, |
---|
495 | * &queue_context |
---|
496 | * ); |
---|
497 | * } |
---|
498 | * @endcode |
---|
499 | * |
---|
500 | * @param[in] queue The actual thread queue. |
---|
501 | * @param[in] operations The thread queue operations. |
---|
502 | * @param[in] the_thread The thread to extract. |
---|
503 | * @param[in] queue_context The thread queue context of the lock acquire. |
---|
504 | */ |
---|
505 | void _Thread_queue_Extract_critical( |
---|
506 | Thread_queue_Queue *queue, |
---|
507 | const Thread_queue_Operations *operations, |
---|
508 | Thread_Control *the_thread, |
---|
509 | Thread_queue_Context *queue_context |
---|
510 | ); |
---|
511 | |
---|
512 | /** |
---|
513 | * @brief Extracts thread from thread queue. |
---|
514 | * |
---|
515 | * This routine removes @a the_thread its thread queue |
---|
516 | * and cancels any timeouts associated with this blocking. |
---|
517 | * |
---|
518 | * @param[in] the_thread is the pointer to a thread control block that |
---|
519 | * is to be removed |
---|
520 | */ |
---|
521 | void _Thread_queue_Extract( Thread_Control *the_thread ); |
---|
522 | |
---|
523 | /** |
---|
524 | * @brief Extracts the_thread from the_thread_queue. |
---|
525 | * |
---|
526 | * This routine extracts the_thread from the_thread_queue |
---|
527 | * and ensures that if there is a proxy for this task on |
---|
528 | * another node, it is also dealt with. |
---|
529 | */ |
---|
530 | void _Thread_queue_Extract_with_proxy( |
---|
531 | Thread_Control *the_thread |
---|
532 | ); |
---|
533 | |
---|
534 | RTEMS_INLINE_ROUTINE bool _Thread_queue_Is_empty( |
---|
535 | const Thread_queue_Queue *queue |
---|
536 | ) |
---|
537 | { |
---|
538 | return queue->heads == NULL; |
---|
539 | } |
---|
540 | |
---|
541 | /** |
---|
542 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
---|
543 | * @c NULL. |
---|
544 | * |
---|
545 | * The caller must be the owner of the thread queue lock. The thread queue |
---|
546 | * lock is not released. |
---|
547 | * |
---|
548 | * @param[in] the_thread_queue The thread queue. |
---|
549 | * @param[in] operations The thread queue operations. |
---|
550 | * |
---|
551 | * @retval NULL No thread is present on the thread queue. |
---|
552 | * @retval first The first thread on the thread queue according to the enqueue |
---|
553 | * order. |
---|
554 | */ |
---|
555 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_queue_First_locked( |
---|
556 | Thread_queue_Control *the_thread_queue, |
---|
557 | const Thread_queue_Operations *operations |
---|
558 | ) |
---|
559 | { |
---|
560 | Thread_queue_Heads *heads = the_thread_queue->Queue.heads; |
---|
561 | |
---|
562 | if ( heads != NULL ) { |
---|
563 | return ( *operations->first )( heads ); |
---|
564 | } else { |
---|
565 | return NULL; |
---|
566 | } |
---|
567 | } |
---|
568 | |
---|
569 | /** |
---|
570 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
---|
571 | * @c NULL. |
---|
572 | * |
---|
573 | * @param[in] the_thread_queue The thread queue. |
---|
574 | * |
---|
575 | * @retval NULL No thread is present on the thread queue. |
---|
576 | * @retval first The first thread on the thread queue according to the enqueue |
---|
577 | * order. |
---|
578 | */ |
---|
579 | Thread_Control *_Thread_queue_First( |
---|
580 | Thread_queue_Control *the_thread_queue, |
---|
581 | const Thread_queue_Operations *operations |
---|
582 | ); |
---|
583 | |
---|
584 | /** |
---|
585 | * @brief Thread queue flush filter function. |
---|
586 | * |
---|
587 | * Called under protection of the thread queue lock by |
---|
588 | * _Thread_queue_Flush_critical() to optionally alter the thread wait |
---|
589 | * information and control the iteration. |
---|
590 | * |
---|
591 | * @param the_thread The thread to extract. This is the first parameter to |
---|
592 | * optimize for architectures that use the same register for the first |
---|
593 | * parameter and the return value. |
---|
594 | * @param queue The actual thread queue. |
---|
595 | * @param queue_context The thread queue context of the lock acquire. May be |
---|
596 | * used to pass additional data to the filter function via an overlay |
---|
597 | * structure. The filter function should not release or acquire the thread |
---|
598 | * queue lock. |
---|
599 | * |
---|
600 | * @retval the_thread Extract this thread. |
---|
601 | * @retval NULL Do not extract this thread and stop the thread queue flush |
---|
602 | * operation. Threads that are already extracted will complete the flush |
---|
603 | * operation. |
---|
604 | */ |
---|
605 | typedef Thread_Control *( *Thread_queue_Flush_filter )( |
---|
606 | Thread_Control *the_thread, |
---|
607 | Thread_queue_Queue *queue, |
---|
608 | Thread_queue_Context *queue_context |
---|
609 | ); |
---|
610 | |
---|
611 | /** |
---|
612 | * @brief Default thread queue flush filter function. |
---|
613 | * |
---|
614 | * @param the_thread The thread to extract. |
---|
615 | * @param queue Unused. |
---|
616 | * @param queue_context Unused. |
---|
617 | * |
---|
618 | * @retval the_thread Extract this thread. |
---|
619 | */ |
---|
620 | Thread_Control *_Thread_queue_Flush_default_filter( |
---|
621 | Thread_Control *the_thread, |
---|
622 | Thread_queue_Queue *queue, |
---|
623 | Thread_queue_Context *queue_context |
---|
624 | ); |
---|
625 | |
---|
626 | /** |
---|
627 | * @brief Status unavailable thread queue flush filter function. |
---|
628 | * |
---|
629 | * Sets the thread wait return code of the thread to STATUS_UNAVAILABLE. |
---|
630 | * |
---|
631 | * @param the_thread The thread to extract. |
---|
632 | * @param queue Unused. |
---|
633 | * @param queue_context Unused. |
---|
634 | * |
---|
635 | * @retval the_thread Extract this thread. |
---|
636 | */ |
---|
637 | Thread_Control *_Thread_queue_Flush_status_unavailable( |
---|
638 | Thread_Control *the_thread, |
---|
639 | Thread_queue_Queue *queue, |
---|
640 | Thread_queue_Context *queue_context |
---|
641 | ); |
---|
642 | |
---|
643 | /** |
---|
644 | * @brief Status object was deleted thread queue flush filter function. |
---|
645 | * |
---|
646 | * Sets the thread wait return code of the thread to STATUS_OBJECT_WAS_DELETED |
---|
647 | * |
---|
648 | * @param the_thread The thread to extract. |
---|
649 | * @param queue Unused. |
---|
650 | * @param queue_context Unused. |
---|
651 | * |
---|
652 | * @retval the_thread Extract this thread. |
---|
653 | */ |
---|
654 | Thread_Control *_Thread_queue_Flush_status_object_was_deleted( |
---|
655 | Thread_Control *the_thread, |
---|
656 | Thread_queue_Queue *queue, |
---|
657 | Thread_queue_Context *queue_context |
---|
658 | ); |
---|
659 | |
---|
660 | /** |
---|
661 | * @brief Unblocks all threads enqueued on the thread queue. |
---|
662 | * |
---|
663 | * This function iteratively extracts the first enqueued thread of the thread |
---|
664 | * queue until the thread queue is empty or the filter function indicates a |
---|
665 | * stop. The thread timers of the extracted threads are cancelled. The |
---|
666 | * extracted threads are unblocked. |
---|
667 | * |
---|
668 | * @param queue The actual thread queue. |
---|
669 | * @param operations The thread queue operations. |
---|
670 | * @param filter The filter functions is called for each thread to extract from |
---|
671 | * the thread queue. It may be used to alter the thread under protection of |
---|
672 | * the thread queue lock, for example to set the thread wait return code. |
---|
673 | * The return value of the filter function controls if the thread queue flush |
---|
674 | * operation should stop or continue. |
---|
675 | * @param queue_context The thread queue context of the lock acquire. May be |
---|
676 | * used to pass additional data to the filter function via an overlay |
---|
677 | * structure. The filter function should not release or acquire the thread |
---|
678 | * queue lock. |
---|
679 | * |
---|
680 | * @return The count of extracted threads. |
---|
681 | */ |
---|
682 | size_t _Thread_queue_Flush_critical( |
---|
683 | Thread_queue_Queue *queue, |
---|
684 | const Thread_queue_Operations *operations, |
---|
685 | Thread_queue_Flush_filter filter, |
---|
686 | Thread_queue_Context *queue_context |
---|
687 | ); |
---|
688 | |
---|
689 | void _Thread_queue_Initialize( Thread_queue_Control *the_thread_queue ); |
---|
690 | |
---|
691 | #if defined(RTEMS_SMP) && defined(RTEMS_DEBUG) && defined(RTEMS_PROFILING) |
---|
692 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
693 | { \ |
---|
694 | .Lock_stats = SMP_LOCK_STATS_INITIALIZER( name ), \ |
---|
695 | .owner = SMP_LOCK_NO_OWNER, \ |
---|
696 | .Queue = { \ |
---|
697 | .heads = NULL, \ |
---|
698 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
699 | } \ |
---|
700 | } |
---|
701 | #elif defined(RTEMS_SMP) && defined(RTEMS_DEBUG) |
---|
702 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
703 | { \ |
---|
704 | .owner = SMP_LOCK_NO_OWNER, \ |
---|
705 | .Queue = { \ |
---|
706 | .heads = NULL, \ |
---|
707 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
708 | } \ |
---|
709 | } |
---|
710 | #elif defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
---|
711 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
712 | { \ |
---|
713 | .Lock_stats = SMP_LOCK_STATS_INITIALIZER( name ), \ |
---|
714 | .Queue = { \ |
---|
715 | .heads = NULL, \ |
---|
716 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
717 | } \ |
---|
718 | } |
---|
719 | #elif defined(RTEMS_SMP) |
---|
720 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
721 | { \ |
---|
722 | .Queue = { \ |
---|
723 | .heads = NULL, \ |
---|
724 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
725 | } \ |
---|
726 | } |
---|
727 | #else |
---|
728 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
729 | { .Queue = { .heads = NULL } } |
---|
730 | #endif |
---|
731 | |
---|
732 | RTEMS_INLINE_ROUTINE void _Thread_queue_Destroy( |
---|
733 | Thread_queue_Control *the_thread_queue |
---|
734 | ) |
---|
735 | { |
---|
736 | #if defined(RTEMS_SMP) |
---|
737 | _SMP_ticket_lock_Destroy( &the_thread_queue->Queue.Lock ); |
---|
738 | _SMP_lock_Stats_destroy( &the_thread_queue->Lock_stats ); |
---|
739 | #endif |
---|
740 | } |
---|
741 | |
---|
742 | /** |
---|
743 | * @brief Boosts the priority of the thread if threads of another scheduler |
---|
744 | * instance are enqueued on the thread queue. |
---|
745 | * |
---|
746 | * The thread queue must use the priority waiting discipline. |
---|
747 | * |
---|
748 | * @param[in] queue The actual thread queue. |
---|
749 | * @param[in] the_thread The thread to boost the priority if necessary. |
---|
750 | */ |
---|
751 | #if defined(RTEMS_SMP) |
---|
752 | void _Thread_queue_Boost_priority( |
---|
753 | Thread_queue_Queue *queue, |
---|
754 | Thread_Control *the_thread |
---|
755 | ); |
---|
756 | #else |
---|
757 | RTEMS_INLINE_ROUTINE void _Thread_queue_Boost_priority( |
---|
758 | Thread_queue_Queue *queue, |
---|
759 | Thread_Control *the_thread |
---|
760 | ) |
---|
761 | { |
---|
762 | (void) queue; |
---|
763 | (void) the_thread; |
---|
764 | } |
---|
765 | #endif |
---|
766 | |
---|
767 | #if defined(RTEMS_MULTIPROCESSING) |
---|
768 | void _Thread_queue_MP_callout_do_nothing( |
---|
769 | Thread_Control *the_proxy, |
---|
770 | Objects_Id mp_id |
---|
771 | ); |
---|
772 | |
---|
773 | void _Thread_queue_Unblock_proxy( |
---|
774 | Thread_queue_Queue *queue, |
---|
775 | Thread_Control *the_thread |
---|
776 | ); |
---|
777 | #endif |
---|
778 | |
---|
779 | /** |
---|
780 | * @brief Helper structure to ensure that all objects containing a thread queue |
---|
781 | * have the right layout. |
---|
782 | * |
---|
783 | * @see _Thread_Wait_get_id() and THREAD_QUEUE_OBJECT_ASSERT(). |
---|
784 | */ |
---|
785 | typedef struct { |
---|
786 | Objects_Control Object; |
---|
787 | Thread_queue_Control Wait_queue; |
---|
788 | } Thread_queue_Object; |
---|
789 | |
---|
790 | #define THREAD_QUEUE_OBJECT_ASSERT( object_type, wait_queue_member ) \ |
---|
791 | RTEMS_STATIC_ASSERT( \ |
---|
792 | offsetof( object_type, wait_queue_member ) \ |
---|
793 | == offsetof( Thread_queue_Object, Wait_queue ) \ |
---|
794 | && ( &( ( (object_type *) 0 )->wait_queue_member ) \ |
---|
795 | == ( &( (Thread_queue_Object *) 0 )->Wait_queue ) ), \ |
---|
796 | object_type \ |
---|
797 | ) |
---|
798 | |
---|
799 | #define THREAD_QUEUE_QUEUE_TO_OBJECT( queue ) \ |
---|
800 | RTEMS_CONTAINER_OF( \ |
---|
801 | queue, \ |
---|
802 | Thread_queue_Object, \ |
---|
803 | Wait_queue.Queue \ |
---|
804 | ) |
---|
805 | |
---|
806 | extern const Thread_queue_Operations _Thread_queue_Operations_default; |
---|
807 | |
---|
808 | extern const Thread_queue_Operations _Thread_queue_Operations_FIFO; |
---|
809 | |
---|
810 | extern const Thread_queue_Operations _Thread_queue_Operations_priority; |
---|
811 | |
---|
812 | /**@}*/ |
---|
813 | |
---|
814 | #ifdef __cplusplus |
---|
815 | } |
---|
816 | #endif |
---|
817 | |
---|
818 | #endif |
---|
819 | /* end of include file */ |
---|