1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Inlined Routines Associated with the Manipulation of the Scheduler |
---|
5 | * |
---|
6 | * This inline file contains all of the inlined routines associated with |
---|
7 | * the manipulation of the scheduler. |
---|
8 | */ |
---|
9 | |
---|
10 | /* |
---|
11 | * Copyright (C) 2010 Gedare Bloom. |
---|
12 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
---|
13 | * Copyright (c) 2014 embedded brains GmbH |
---|
14 | * |
---|
15 | * The license and distribution terms for this file may be |
---|
16 | * found in the file LICENSE in this distribution or at |
---|
17 | * http://www.rtems.org/license/LICENSE. |
---|
18 | */ |
---|
19 | |
---|
20 | #ifndef _RTEMS_SCORE_SCHEDULERIMPL_H |
---|
21 | #define _RTEMS_SCORE_SCHEDULERIMPL_H |
---|
22 | |
---|
23 | #include <rtems/score/scheduler.h> |
---|
24 | #include <rtems/score/cpusetimpl.h> |
---|
25 | #include <rtems/score/smpimpl.h> |
---|
26 | #include <rtems/score/threadimpl.h> |
---|
27 | |
---|
28 | #ifdef __cplusplus |
---|
29 | extern "C" { |
---|
30 | #endif |
---|
31 | |
---|
32 | /** |
---|
33 | * @addtogroup ScoreScheduler |
---|
34 | */ |
---|
35 | /**@{**/ |
---|
36 | |
---|
37 | /** |
---|
38 | * @brief Initializes the scheduler to the policy chosen by the user. |
---|
39 | * |
---|
40 | * This routine initializes the scheduler to the policy chosen by the user |
---|
41 | * through confdefs, or to the priority scheduler with ready chains by |
---|
42 | * default. |
---|
43 | */ |
---|
44 | void _Scheduler_Handler_initialization( void ); |
---|
45 | |
---|
46 | RTEMS_INLINE_ROUTINE Scheduler_Context *_Scheduler_Get_context( |
---|
47 | const Scheduler_Control *scheduler |
---|
48 | ) |
---|
49 | { |
---|
50 | return scheduler->context; |
---|
51 | } |
---|
52 | |
---|
53 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get( |
---|
54 | const Thread_Control *the_thread |
---|
55 | ) |
---|
56 | { |
---|
57 | #if defined(RTEMS_SMP) |
---|
58 | return the_thread->Scheduler.control; |
---|
59 | #else |
---|
60 | (void) the_thread; |
---|
61 | |
---|
62 | return &_Scheduler_Table[ 0 ]; |
---|
63 | #endif |
---|
64 | } |
---|
65 | |
---|
66 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_own( |
---|
67 | const Thread_Control *the_thread |
---|
68 | ) |
---|
69 | { |
---|
70 | #if defined(RTEMS_SMP) |
---|
71 | return the_thread->Scheduler.own_control; |
---|
72 | #else |
---|
73 | (void) the_thread; |
---|
74 | |
---|
75 | return &_Scheduler_Table[ 0 ]; |
---|
76 | #endif |
---|
77 | } |
---|
78 | |
---|
79 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_CPU_index( |
---|
80 | uint32_t cpu_index |
---|
81 | ) |
---|
82 | { |
---|
83 | #if defined(RTEMS_SMP) |
---|
84 | return _Scheduler_Assignments[ cpu_index ].scheduler; |
---|
85 | #else |
---|
86 | (void) cpu_index; |
---|
87 | |
---|
88 | return &_Scheduler_Table[ 0 ]; |
---|
89 | #endif |
---|
90 | } |
---|
91 | |
---|
92 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_CPU( |
---|
93 | const Per_CPU_Control *cpu |
---|
94 | ) |
---|
95 | { |
---|
96 | uint32_t cpu_index = _Per_CPU_Get_index( cpu ); |
---|
97 | |
---|
98 | return _Scheduler_Get_by_CPU_index( cpu_index ); |
---|
99 | } |
---|
100 | |
---|
101 | RTEMS_INLINE_ROUTINE Scheduler_Node *_Scheduler_Thread_get_own_node( |
---|
102 | const Thread_Control *the_thread |
---|
103 | ) |
---|
104 | { |
---|
105 | #if defined(RTEMS_SMP) |
---|
106 | return the_thread->Scheduler.own_node; |
---|
107 | #else |
---|
108 | return the_thread->Scheduler.node; |
---|
109 | #endif |
---|
110 | } |
---|
111 | |
---|
112 | #if defined(RTEMS_SMP) |
---|
113 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Node_get_user( |
---|
114 | const Scheduler_Node *node |
---|
115 | ) |
---|
116 | { |
---|
117 | return node->user; |
---|
118 | } |
---|
119 | #endif |
---|
120 | |
---|
121 | /** |
---|
122 | * The preferred method to add a new scheduler is to define the jump table |
---|
123 | * entries and add a case to the _Scheduler_Initialize routine. |
---|
124 | * |
---|
125 | * Generic scheduling implementations that rely on the ready queue only can |
---|
126 | * be found in the _Scheduler_queue_XXX functions. |
---|
127 | */ |
---|
128 | |
---|
129 | /* |
---|
130 | * Passing the Scheduler_Control* to these functions allows for multiple |
---|
131 | * scheduler's to exist simultaneously, which could be useful on an SMP |
---|
132 | * system. Then remote Schedulers may be accessible. How to protect such |
---|
133 | * accesses remains an open problem. |
---|
134 | */ |
---|
135 | |
---|
136 | /** |
---|
137 | * @brief General scheduling decision. |
---|
138 | * |
---|
139 | * This kernel routine implements the scheduling decision logic for |
---|
140 | * the scheduler. It does NOT dispatch. |
---|
141 | * |
---|
142 | * @param[in] the_thread The thread which state changed previously. |
---|
143 | */ |
---|
144 | RTEMS_INLINE_ROUTINE void _Scheduler_Schedule( Thread_Control *the_thread ) |
---|
145 | { |
---|
146 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
147 | |
---|
148 | ( *scheduler->Operations.schedule )( scheduler, the_thread ); |
---|
149 | } |
---|
150 | |
---|
151 | #if defined(RTEMS_SMP) |
---|
152 | typedef struct { |
---|
153 | Thread_Control *needs_help; |
---|
154 | Thread_Control *next_needs_help; |
---|
155 | } Scheduler_Ask_for_help_context ; |
---|
156 | |
---|
157 | RTEMS_INLINE_ROUTINE bool _Scheduler_Ask_for_help_visitor( |
---|
158 | Resource_Node *resource_node, |
---|
159 | void *arg |
---|
160 | ) |
---|
161 | { |
---|
162 | bool done; |
---|
163 | Scheduler_Ask_for_help_context *help_context = arg; |
---|
164 | Thread_Control *previous_needs_help = help_context->needs_help; |
---|
165 | Thread_Control *next_needs_help; |
---|
166 | Thread_Control *offers_help = |
---|
167 | THREAD_RESOURCE_NODE_TO_THREAD( resource_node ); |
---|
168 | const Scheduler_Control *scheduler = _Scheduler_Get_own( offers_help ); |
---|
169 | |
---|
170 | next_needs_help = ( *scheduler->Operations.ask_for_help )( |
---|
171 | scheduler, |
---|
172 | offers_help, |
---|
173 | previous_needs_help |
---|
174 | ); |
---|
175 | |
---|
176 | done = next_needs_help != previous_needs_help; |
---|
177 | |
---|
178 | if ( done ) { |
---|
179 | help_context->next_needs_help = next_needs_help; |
---|
180 | } |
---|
181 | |
---|
182 | return done; |
---|
183 | } |
---|
184 | |
---|
185 | /** |
---|
186 | * @brief Ask threads depending on resources owned by the thread for help. |
---|
187 | * |
---|
188 | * A thread is in need for help if it lost its assigned processor due to |
---|
189 | * pre-emption by a higher priority thread or it was not possible to assign it |
---|
190 | * a processor since its priority is to low on its current scheduler instance. |
---|
191 | * |
---|
192 | * The run-time of this function depends on the size of the resource tree of |
---|
193 | * the thread needing help and other resource trees in case threads in need for |
---|
194 | * help are produced during this operation. |
---|
195 | * |
---|
196 | * @param[in] needs_help The thread needing help. |
---|
197 | */ |
---|
198 | RTEMS_INLINE_ROUTINE void _Scheduler_Ask_for_help( |
---|
199 | Thread_Control *needs_help |
---|
200 | ) |
---|
201 | { |
---|
202 | do { |
---|
203 | const Scheduler_Control *scheduler = _Scheduler_Get_own( needs_help ); |
---|
204 | |
---|
205 | needs_help = ( *scheduler->Operations.ask_for_help )( |
---|
206 | scheduler, |
---|
207 | needs_help, |
---|
208 | needs_help |
---|
209 | ); |
---|
210 | |
---|
211 | if ( needs_help != NULL ) { |
---|
212 | Scheduler_Ask_for_help_context help_context = { needs_help, NULL }; |
---|
213 | |
---|
214 | _Resource_Iterate( |
---|
215 | &needs_help->Resource_node, |
---|
216 | _Scheduler_Ask_for_help_visitor, |
---|
217 | &help_context |
---|
218 | ); |
---|
219 | |
---|
220 | needs_help = help_context.next_needs_help; |
---|
221 | } |
---|
222 | } while ( needs_help != NULL ); |
---|
223 | } |
---|
224 | |
---|
225 | RTEMS_INLINE_ROUTINE void _Scheduler_Ask_for_help_if_necessary( |
---|
226 | Thread_Control *needs_help |
---|
227 | ) |
---|
228 | { |
---|
229 | if ( |
---|
230 | needs_help != NULL |
---|
231 | && _Resource_Node_owns_resources( &needs_help->Resource_node ) |
---|
232 | ) { |
---|
233 | Scheduler_Node *node = _Scheduler_Thread_get_own_node( needs_help ); |
---|
234 | |
---|
235 | if ( |
---|
236 | node->help_state != SCHEDULER_HELP_ACTIVE_RIVAL |
---|
237 | || _Scheduler_Node_get_user( node ) != needs_help |
---|
238 | ) { |
---|
239 | _Scheduler_Ask_for_help( needs_help ); |
---|
240 | } |
---|
241 | } |
---|
242 | } |
---|
243 | #endif |
---|
244 | |
---|
245 | /** |
---|
246 | * @brief Scheduler yield with a particular thread. |
---|
247 | * |
---|
248 | * This routine is invoked when a thread wishes to voluntarily transfer control |
---|
249 | * of the processor to another thread. |
---|
250 | * |
---|
251 | * @param[in] the_thread The yielding thread. |
---|
252 | */ |
---|
253 | RTEMS_INLINE_ROUTINE void _Scheduler_Yield( Thread_Control *the_thread ) |
---|
254 | { |
---|
255 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
256 | #if defined(RTEMS_SMP) |
---|
257 | Thread_Control *needs_help; |
---|
258 | |
---|
259 | needs_help = |
---|
260 | #endif |
---|
261 | ( *scheduler->Operations.yield )( scheduler, the_thread ); |
---|
262 | |
---|
263 | #if defined(RTEMS_SMP) |
---|
264 | _Scheduler_Ask_for_help_if_necessary( needs_help ); |
---|
265 | #endif |
---|
266 | } |
---|
267 | |
---|
268 | /** |
---|
269 | * @brief Blocks a thread with respect to the scheduler. |
---|
270 | * |
---|
271 | * This routine removes @a the_thread from the scheduling decision for |
---|
272 | * the scheduler. The primary task is to remove the thread from the |
---|
273 | * ready queue. It performs any necessary schedulering operations |
---|
274 | * including the selection of a new heir thread. |
---|
275 | * |
---|
276 | * @param[in] the_thread The thread. |
---|
277 | */ |
---|
278 | RTEMS_INLINE_ROUTINE void _Scheduler_Block( Thread_Control *the_thread ) |
---|
279 | { |
---|
280 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
281 | |
---|
282 | ( *scheduler->Operations.block )( scheduler, the_thread ); |
---|
283 | } |
---|
284 | |
---|
285 | /** |
---|
286 | * @brief Unblocks a thread with respect to the scheduler. |
---|
287 | * |
---|
288 | * This routine adds @a the_thread to the scheduling decision for |
---|
289 | * the scheduler. The primary task is to add the thread to the |
---|
290 | * ready queue per the schedulering policy and update any appropriate |
---|
291 | * scheduling variables, for example the heir thread. |
---|
292 | * |
---|
293 | * @param[in] the_thread The thread. |
---|
294 | */ |
---|
295 | RTEMS_INLINE_ROUTINE void _Scheduler_Unblock( Thread_Control *the_thread ) |
---|
296 | { |
---|
297 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
298 | #if defined(RTEMS_SMP) |
---|
299 | Thread_Control *needs_help; |
---|
300 | |
---|
301 | needs_help = |
---|
302 | #endif |
---|
303 | ( *scheduler->Operations.unblock )( scheduler, the_thread ); |
---|
304 | |
---|
305 | #if defined(RTEMS_SMP) |
---|
306 | _Scheduler_Ask_for_help_if_necessary( needs_help ); |
---|
307 | #endif |
---|
308 | } |
---|
309 | |
---|
310 | /** |
---|
311 | * @brief Propagates a priority change of a thread to the scheduler. |
---|
312 | * |
---|
313 | * The caller must ensure that the thread is in the ready state. The caller |
---|
314 | * must ensure that the priority value actually changed and is not equal to the |
---|
315 | * current priority value. |
---|
316 | * |
---|
317 | * @param[in] the_thread The thread changing its priority. |
---|
318 | * @param[in] new_priority The new thread priority. |
---|
319 | * @param[in] prepend_it In case this is true, then enqueue the thread as the |
---|
320 | * first of its priority group, otherwise enqueue the thread as the last of its |
---|
321 | * priority group. |
---|
322 | */ |
---|
323 | RTEMS_INLINE_ROUTINE void _Scheduler_Change_priority( |
---|
324 | Thread_Control *the_thread, |
---|
325 | Priority_Control new_priority, |
---|
326 | bool prepend_it |
---|
327 | ) |
---|
328 | { |
---|
329 | const Scheduler_Control *scheduler = _Scheduler_Get_own( the_thread ); |
---|
330 | #if defined(RTEMS_SMP) |
---|
331 | Thread_Control *needs_help; |
---|
332 | |
---|
333 | needs_help = |
---|
334 | #endif |
---|
335 | ( *scheduler->Operations.change_priority )( |
---|
336 | scheduler, |
---|
337 | the_thread, |
---|
338 | new_priority, |
---|
339 | prepend_it |
---|
340 | ); |
---|
341 | |
---|
342 | #if defined(RTEMS_SMP) |
---|
343 | _Scheduler_Ask_for_help_if_necessary( needs_help ); |
---|
344 | #endif |
---|
345 | } |
---|
346 | |
---|
347 | /** |
---|
348 | * @brief Initializes a scheduler node. |
---|
349 | * |
---|
350 | * The scheduler node contains arbitrary data on function entry. The caller |
---|
351 | * must ensure that _Scheduler_Node_destroy() will be called after a |
---|
352 | * _Scheduler_Node_initialize() before the memory of the scheduler node is |
---|
353 | * destroyed. |
---|
354 | * |
---|
355 | * @param[in] scheduler The scheduler instance. |
---|
356 | * @param[in] the_thread The thread containing the scheduler node. |
---|
357 | */ |
---|
358 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_initialize( |
---|
359 | const Scheduler_Control *scheduler, |
---|
360 | Thread_Control *the_thread |
---|
361 | ) |
---|
362 | { |
---|
363 | return ( *scheduler->Operations.node_initialize )( scheduler, the_thread ); |
---|
364 | } |
---|
365 | |
---|
366 | /** |
---|
367 | * @brief Destroys a scheduler node. |
---|
368 | * |
---|
369 | * The caller must ensure that _Scheduler_Node_destroy() will be called only |
---|
370 | * after a corresponding _Scheduler_Node_initialize(). |
---|
371 | * |
---|
372 | * @param[in] scheduler The scheduler instance. |
---|
373 | * @param[in] the_thread The thread containing the scheduler node. |
---|
374 | */ |
---|
375 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_destroy( |
---|
376 | const Scheduler_Control *scheduler, |
---|
377 | Thread_Control *the_thread |
---|
378 | ) |
---|
379 | { |
---|
380 | ( *scheduler->Operations.node_destroy )( scheduler, the_thread ); |
---|
381 | } |
---|
382 | |
---|
383 | /** |
---|
384 | * @brief Updates the scheduler about a priority change of a not ready thread. |
---|
385 | * |
---|
386 | * @param[in] the_thread The thread. |
---|
387 | * @param[in] new_priority The new priority of the thread. |
---|
388 | */ |
---|
389 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_priority( |
---|
390 | Thread_Control *the_thread, |
---|
391 | Priority_Control new_priority |
---|
392 | ) |
---|
393 | { |
---|
394 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
395 | |
---|
396 | ( *scheduler->Operations.update_priority )( |
---|
397 | scheduler, |
---|
398 | the_thread, |
---|
399 | new_priority |
---|
400 | ); |
---|
401 | } |
---|
402 | |
---|
403 | /** |
---|
404 | * @brief Compares two priority values. |
---|
405 | * |
---|
406 | * @param[in] scheduler The scheduler instance. |
---|
407 | * @param[in] p1 The first priority value. |
---|
408 | * @param[in] p2 The second priority value. |
---|
409 | * |
---|
410 | * @retval negative The value @a p1 encodes a lower priority than @a p2 in the |
---|
411 | * intuitive sense of priority. |
---|
412 | * @retval 0 The priorities @a p1 and @a p2 are equal. |
---|
413 | * @retval positive The value @a p1 encodes a higher priority than @a p2 in the |
---|
414 | * intuitive sense of priority. |
---|
415 | * |
---|
416 | * @see _Scheduler_Is_priority_lower_than() and |
---|
417 | * _Scheduler_Is_priority_higher_than(). |
---|
418 | */ |
---|
419 | RTEMS_INLINE_ROUTINE int _Scheduler_Priority_compare( |
---|
420 | const Scheduler_Control *scheduler, |
---|
421 | Priority_Control p1, |
---|
422 | Priority_Control p2 |
---|
423 | ) |
---|
424 | { |
---|
425 | return ( *scheduler->Operations.priority_compare )( p1, p2 ); |
---|
426 | } |
---|
427 | |
---|
428 | /** |
---|
429 | * @brief Releases a job of a thread with respect to the scheduler. |
---|
430 | * |
---|
431 | * @param[in] the_thread The thread. |
---|
432 | * @param[in] length The period length. |
---|
433 | */ |
---|
434 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_job( |
---|
435 | Thread_Control *the_thread, |
---|
436 | uint32_t length |
---|
437 | ) |
---|
438 | { |
---|
439 | const Scheduler_Control *scheduler = _Scheduler_Get( the_thread ); |
---|
440 | |
---|
441 | ( *scheduler->Operations.release_job )( scheduler, the_thread, length ); |
---|
442 | } |
---|
443 | |
---|
444 | /** |
---|
445 | * @brief Scheduler method invoked at each clock tick. |
---|
446 | * |
---|
447 | * This method is invoked at each clock tick to allow the scheduler |
---|
448 | * implementation to perform any activities required. For the |
---|
449 | * scheduler which support standard RTEMS features, this includes |
---|
450 | * time-slicing management. |
---|
451 | */ |
---|
452 | RTEMS_INLINE_ROUTINE void _Scheduler_Tick( void ) |
---|
453 | { |
---|
454 | uint32_t cpu_count = _SMP_Get_processor_count(); |
---|
455 | uint32_t cpu_index; |
---|
456 | |
---|
457 | for ( cpu_index = 0 ; cpu_index < cpu_count ; ++cpu_index ) { |
---|
458 | const Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index ); |
---|
459 | const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU( cpu ); |
---|
460 | Thread_Control *executing = cpu->executing; |
---|
461 | |
---|
462 | if ( scheduler != NULL && executing != NULL ) { |
---|
463 | ( *scheduler->Operations.tick )( scheduler, executing ); |
---|
464 | } |
---|
465 | } |
---|
466 | } |
---|
467 | |
---|
468 | /** |
---|
469 | * @brief Starts the idle thread for a particular processor. |
---|
470 | * |
---|
471 | * @param[in,out] the_thread The idle thread for the processor. |
---|
472 | * @parma[in,out] processor The processor for the idle thread. |
---|
473 | * |
---|
474 | * @see _Thread_Create_idle(). |
---|
475 | */ |
---|
476 | RTEMS_INLINE_ROUTINE void _Scheduler_Start_idle( |
---|
477 | const Scheduler_Control *scheduler, |
---|
478 | Thread_Control *the_thread, |
---|
479 | Per_CPU_Control *cpu |
---|
480 | ) |
---|
481 | { |
---|
482 | ( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu ); |
---|
483 | } |
---|
484 | |
---|
485 | #if defined(RTEMS_SMP) |
---|
486 | RTEMS_INLINE_ROUTINE const Scheduler_Assignment *_Scheduler_Get_assignment( |
---|
487 | uint32_t cpu_index |
---|
488 | ) |
---|
489 | { |
---|
490 | return &_Scheduler_Assignments[ cpu_index ]; |
---|
491 | } |
---|
492 | |
---|
493 | RTEMS_INLINE_ROUTINE bool _Scheduler_Is_mandatory_processor( |
---|
494 | const Scheduler_Assignment *assignment |
---|
495 | ) |
---|
496 | { |
---|
497 | return (assignment->attributes & SCHEDULER_ASSIGN_PROCESSOR_MANDATORY) != 0; |
---|
498 | } |
---|
499 | |
---|
500 | RTEMS_INLINE_ROUTINE bool _Scheduler_Should_start_processor( |
---|
501 | const Scheduler_Assignment *assignment |
---|
502 | ) |
---|
503 | { |
---|
504 | return assignment->scheduler != NULL; |
---|
505 | } |
---|
506 | #endif /* defined(RTEMS_SMP) */ |
---|
507 | |
---|
508 | RTEMS_INLINE_ROUTINE bool _Scheduler_Has_processor_ownership( |
---|
509 | const Scheduler_Control *scheduler, |
---|
510 | uint32_t cpu_index |
---|
511 | ) |
---|
512 | { |
---|
513 | #if defined(RTEMS_SMP) |
---|
514 | const Scheduler_Assignment *assignment = |
---|
515 | _Scheduler_Get_assignment( cpu_index ); |
---|
516 | |
---|
517 | return assignment->scheduler == scheduler; |
---|
518 | #else |
---|
519 | (void) scheduler; |
---|
520 | (void) cpu_index; |
---|
521 | |
---|
522 | return true; |
---|
523 | #endif |
---|
524 | } |
---|
525 | |
---|
526 | RTEMS_INLINE_ROUTINE void _Scheduler_Set( |
---|
527 | const Scheduler_Control *scheduler, |
---|
528 | Thread_Control *the_thread |
---|
529 | ) |
---|
530 | { |
---|
531 | #if defined(RTEMS_SMP) |
---|
532 | const Scheduler_Control *current_scheduler = _Scheduler_Get( the_thread ); |
---|
533 | |
---|
534 | if ( current_scheduler != scheduler ) { |
---|
535 | _Thread_Set_state( the_thread, STATES_MIGRATING ); |
---|
536 | _Scheduler_Node_destroy( current_scheduler, the_thread ); |
---|
537 | the_thread->Scheduler.own_control = scheduler; |
---|
538 | the_thread->Scheduler.control = scheduler; |
---|
539 | _Scheduler_Node_initialize( scheduler, the_thread ); |
---|
540 | _Scheduler_Update_priority( the_thread, the_thread->current_priority ); |
---|
541 | _Thread_Clear_state( the_thread, STATES_MIGRATING ); |
---|
542 | } |
---|
543 | #else |
---|
544 | (void) scheduler; |
---|
545 | #endif |
---|
546 | } |
---|
547 | |
---|
548 | #if defined(__RTEMS_HAVE_SYS_CPUSET_H__) |
---|
549 | |
---|
550 | RTEMS_INLINE_ROUTINE void _Scheduler_Get_processor_set( |
---|
551 | const Scheduler_Control *scheduler, |
---|
552 | size_t cpusetsize, |
---|
553 | cpu_set_t *cpuset |
---|
554 | ) |
---|
555 | { |
---|
556 | uint32_t cpu_count = _SMP_Get_processor_count(); |
---|
557 | uint32_t cpu_index; |
---|
558 | |
---|
559 | CPU_ZERO_S( cpusetsize, cpuset ); |
---|
560 | |
---|
561 | for ( cpu_index = 0 ; cpu_index < cpu_count ; ++cpu_index ) { |
---|
562 | #if defined(RTEMS_SMP) |
---|
563 | if ( _Scheduler_Has_processor_ownership( scheduler, cpu_index ) ) { |
---|
564 | CPU_SET_S( (int) cpu_index, cpusetsize, cpuset ); |
---|
565 | } |
---|
566 | #else |
---|
567 | (void) scheduler; |
---|
568 | |
---|
569 | CPU_SET_S( (int) cpu_index, cpusetsize, cpuset ); |
---|
570 | #endif |
---|
571 | } |
---|
572 | } |
---|
573 | |
---|
574 | RTEMS_INLINE_ROUTINE bool _Scheduler_default_Get_affinity_body( |
---|
575 | const Scheduler_Control *scheduler, |
---|
576 | Thread_Control *the_thread, |
---|
577 | size_t cpusetsize, |
---|
578 | cpu_set_t *cpuset |
---|
579 | ) |
---|
580 | { |
---|
581 | (void) the_thread; |
---|
582 | |
---|
583 | _Scheduler_Get_processor_set( scheduler, cpusetsize, cpuset ); |
---|
584 | |
---|
585 | return true; |
---|
586 | } |
---|
587 | |
---|
588 | bool _Scheduler_Get_affinity( |
---|
589 | Thread_Control *the_thread, |
---|
590 | size_t cpusetsize, |
---|
591 | cpu_set_t *cpuset |
---|
592 | ); |
---|
593 | |
---|
594 | RTEMS_INLINE_ROUTINE bool _Scheduler_default_Set_affinity_body( |
---|
595 | const Scheduler_Control *scheduler, |
---|
596 | Thread_Control *the_thread, |
---|
597 | size_t cpusetsize, |
---|
598 | const cpu_set_t *cpuset |
---|
599 | ) |
---|
600 | { |
---|
601 | uint32_t cpu_count = _SMP_Get_processor_count(); |
---|
602 | uint32_t cpu_index; |
---|
603 | bool ok = true; |
---|
604 | |
---|
605 | for ( cpu_index = 0 ; cpu_index < cpu_count ; ++cpu_index ) { |
---|
606 | #if defined(RTEMS_SMP) |
---|
607 | const Scheduler_Control *scheduler_of_cpu = |
---|
608 | _Scheduler_Get_by_CPU_index( cpu_index ); |
---|
609 | |
---|
610 | ok = ok |
---|
611 | && ( CPU_ISSET_S( (int) cpu_index, cpusetsize, cpuset ) |
---|
612 | || ( !CPU_ISSET_S( (int) cpu_index, cpusetsize, cpuset ) |
---|
613 | && scheduler != scheduler_of_cpu ) ); |
---|
614 | #else |
---|
615 | (void) scheduler; |
---|
616 | |
---|
617 | ok = ok && CPU_ISSET_S( (int) cpu_index, cpusetsize, cpuset ); |
---|
618 | #endif |
---|
619 | } |
---|
620 | |
---|
621 | return ok; |
---|
622 | } |
---|
623 | |
---|
624 | bool _Scheduler_Set_affinity( |
---|
625 | Thread_Control *the_thread, |
---|
626 | size_t cpusetsize, |
---|
627 | const cpu_set_t *cpuset |
---|
628 | ); |
---|
629 | |
---|
630 | #endif /* defined(__RTEMS_HAVE_SYS_CPUSET_H__) */ |
---|
631 | |
---|
632 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_heir( |
---|
633 | Thread_Control *heir, |
---|
634 | bool force_dispatch |
---|
635 | ) |
---|
636 | { |
---|
637 | Thread_Control *executing = _Thread_Executing; |
---|
638 | |
---|
639 | _Thread_Heir = heir; |
---|
640 | |
---|
641 | if ( executing != heir && ( force_dispatch || executing->is_preemptible ) ) |
---|
642 | _Thread_Dispatch_necessary = true; |
---|
643 | } |
---|
644 | |
---|
645 | RTEMS_INLINE_ROUTINE void _Scheduler_Generic_block( |
---|
646 | const Scheduler_Control *scheduler, |
---|
647 | Thread_Control *the_thread, |
---|
648 | void ( *extract )( |
---|
649 | const Scheduler_Control *, |
---|
650 | Thread_Control * ), |
---|
651 | void ( *schedule )( |
---|
652 | const Scheduler_Control *, |
---|
653 | Thread_Control *, |
---|
654 | bool ) |
---|
655 | ) |
---|
656 | { |
---|
657 | ( *extract )( scheduler, the_thread ); |
---|
658 | |
---|
659 | /* TODO: flash critical section? */ |
---|
660 | |
---|
661 | if ( _Thread_Is_executing( the_thread ) || _Thread_Is_heir( the_thread ) ) { |
---|
662 | ( *schedule )( scheduler, the_thread, true ); |
---|
663 | } |
---|
664 | } |
---|
665 | |
---|
666 | /** |
---|
667 | * @brief Returns true if @a p1 encodes a lower priority than @a p2 in the |
---|
668 | * intuitive sense of priority. |
---|
669 | */ |
---|
670 | RTEMS_INLINE_ROUTINE bool _Scheduler_Is_priority_lower_than( |
---|
671 | const Scheduler_Control *scheduler, |
---|
672 | Priority_Control p1, |
---|
673 | Priority_Control p2 |
---|
674 | ) |
---|
675 | { |
---|
676 | return _Scheduler_Priority_compare( scheduler, p1, p2 ) < 0; |
---|
677 | } |
---|
678 | |
---|
679 | /** |
---|
680 | * @brief Returns true if @a p1 encodes a higher priority than @a p2 in the |
---|
681 | * intuitive sense of priority. |
---|
682 | */ |
---|
683 | RTEMS_INLINE_ROUTINE bool _Scheduler_Is_priority_higher_than( |
---|
684 | const Scheduler_Control *scheduler, |
---|
685 | Priority_Control p1, |
---|
686 | Priority_Control p2 |
---|
687 | ) |
---|
688 | { |
---|
689 | return _Scheduler_Priority_compare( scheduler, p1, p2 ) > 0; |
---|
690 | } |
---|
691 | |
---|
692 | /** |
---|
693 | * @brief Returns the priority encoding @a p1 or @a p2 with the higher priority |
---|
694 | * in the intuitive sense of priority. |
---|
695 | */ |
---|
696 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Highest_priority_of_two( |
---|
697 | const Scheduler_Control *scheduler, |
---|
698 | Priority_Control p1, |
---|
699 | Priority_Control p2 |
---|
700 | ) |
---|
701 | { |
---|
702 | return _Scheduler_Is_priority_higher_than( scheduler, p1, p2 ) ? p1 : p2; |
---|
703 | } |
---|
704 | |
---|
705 | /** |
---|
706 | * @brief Sets the thread priority to @a priority if it is higher than the |
---|
707 | * current priority of the thread in the intuitive sense of priority. |
---|
708 | */ |
---|
709 | RTEMS_INLINE_ROUTINE void _Scheduler_Set_priority_if_higher( |
---|
710 | const Scheduler_Control *scheduler, |
---|
711 | Thread_Control *the_thread, |
---|
712 | Priority_Control priority |
---|
713 | ) |
---|
714 | { |
---|
715 | Priority_Control current = the_thread->current_priority; |
---|
716 | |
---|
717 | if ( _Scheduler_Is_priority_higher_than( scheduler, priority, current ) ) { |
---|
718 | _Thread_Set_priority( the_thread, priority ); |
---|
719 | } |
---|
720 | } |
---|
721 | |
---|
722 | /** |
---|
723 | * @brief Changes the thread priority to @a priority if it is higher than the |
---|
724 | * current priority of the thread in the intuitive sense of priority. |
---|
725 | */ |
---|
726 | RTEMS_INLINE_ROUTINE void _Scheduler_Change_priority_if_higher( |
---|
727 | const Scheduler_Control *scheduler, |
---|
728 | Thread_Control *the_thread, |
---|
729 | Priority_Control priority, |
---|
730 | bool prepend_it |
---|
731 | ) |
---|
732 | { |
---|
733 | Priority_Control current = the_thread->current_priority; |
---|
734 | |
---|
735 | if ( _Scheduler_Is_priority_higher_than( scheduler, priority, current ) ) { |
---|
736 | _Thread_Change_priority( the_thread, priority, prepend_it ); |
---|
737 | } |
---|
738 | } |
---|
739 | |
---|
740 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_processor_count( |
---|
741 | const Scheduler_Control *scheduler |
---|
742 | ) |
---|
743 | { |
---|
744 | #if defined(RTEMS_SMP) |
---|
745 | return _Scheduler_Get_context( scheduler )->processor_count; |
---|
746 | #else |
---|
747 | (void) scheduler; |
---|
748 | |
---|
749 | return 1; |
---|
750 | #endif |
---|
751 | } |
---|
752 | |
---|
753 | RTEMS_INLINE_ROUTINE Objects_Id _Scheduler_Build_id( uint32_t scheduler_index ) |
---|
754 | { |
---|
755 | return _Objects_Build_id( |
---|
756 | OBJECTS_FAKE_OBJECTS_API, |
---|
757 | OBJECTS_FAKE_OBJECTS_SCHEDULERS, |
---|
758 | _Objects_Local_node, |
---|
759 | scheduler_index + 1 |
---|
760 | ); |
---|
761 | } |
---|
762 | |
---|
763 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index_by_id( Objects_Id id ) |
---|
764 | { |
---|
765 | uint32_t minimum_id = _Scheduler_Build_id( 0 ); |
---|
766 | |
---|
767 | return id - minimum_id; |
---|
768 | } |
---|
769 | |
---|
770 | RTEMS_INLINE_ROUTINE bool _Scheduler_Get_by_id( |
---|
771 | Objects_Id id, |
---|
772 | const Scheduler_Control **scheduler_p |
---|
773 | ) |
---|
774 | { |
---|
775 | uint32_t index = _Scheduler_Get_index_by_id( id ); |
---|
776 | const Scheduler_Control *scheduler = &_Scheduler_Table[ index ]; |
---|
777 | |
---|
778 | *scheduler_p = scheduler; |
---|
779 | |
---|
780 | return index < _Scheduler_Count |
---|
781 | && _Scheduler_Get_processor_count( scheduler ) > 0; |
---|
782 | } |
---|
783 | |
---|
784 | RTEMS_INLINE_ROUTINE bool _Scheduler_Is_id_valid( Objects_Id id ) |
---|
785 | { |
---|
786 | const Scheduler_Control *scheduler; |
---|
787 | bool ok = _Scheduler_Get_by_id( id, &scheduler ); |
---|
788 | |
---|
789 | (void) scheduler; |
---|
790 | |
---|
791 | return ok; |
---|
792 | } |
---|
793 | |
---|
794 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index( |
---|
795 | const Scheduler_Control *scheduler |
---|
796 | ) |
---|
797 | { |
---|
798 | return (uint32_t) (scheduler - &_Scheduler_Table[ 0 ]); |
---|
799 | } |
---|
800 | |
---|
801 | RTEMS_INLINE_ROUTINE Scheduler_Node *_Scheduler_Thread_get_node( |
---|
802 | const Thread_Control *the_thread |
---|
803 | ) |
---|
804 | { |
---|
805 | return the_thread->Scheduler.node; |
---|
806 | } |
---|
807 | |
---|
808 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_do_initialize( |
---|
809 | Scheduler_Node *node, |
---|
810 | Thread_Control *the_thread |
---|
811 | ) |
---|
812 | { |
---|
813 | #if defined(RTEMS_SMP) |
---|
814 | node->user = the_thread; |
---|
815 | node->help_state = SCHEDULER_HELP_YOURSELF; |
---|
816 | node->owner = the_thread; |
---|
817 | node->idle = NULL; |
---|
818 | node->accepts_help = the_thread; |
---|
819 | #else |
---|
820 | (void) node; |
---|
821 | (void) the_thread; |
---|
822 | #endif |
---|
823 | } |
---|
824 | |
---|
825 | #if defined(RTEMS_SMP) |
---|
826 | /** |
---|
827 | * @brief Gets an idle thread from the scheduler instance. |
---|
828 | * |
---|
829 | * @param[in] context The scheduler instance context. |
---|
830 | * |
---|
831 | * @retval idle An idle thread for use. This function must always return an |
---|
832 | * idle thread. If none is available, then this is a fatal error. |
---|
833 | */ |
---|
834 | typedef Thread_Control *( *Scheduler_Get_idle_thread )( |
---|
835 | Scheduler_Context *context |
---|
836 | ); |
---|
837 | |
---|
838 | /** |
---|
839 | * @brief Releases an idle thread to the scheduler instance for reuse. |
---|
840 | * |
---|
841 | * @param[in] context The scheduler instance context. |
---|
842 | * @param[in] idle The idle thread to release |
---|
843 | */ |
---|
844 | typedef void ( *Scheduler_Release_idle_thread )( |
---|
845 | Scheduler_Context *context, |
---|
846 | Thread_Control *idle |
---|
847 | ); |
---|
848 | |
---|
849 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Node_get_owner( |
---|
850 | const Scheduler_Node *node |
---|
851 | ) |
---|
852 | { |
---|
853 | return node->owner; |
---|
854 | } |
---|
855 | |
---|
856 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Node_get_idle( |
---|
857 | const Scheduler_Node *node |
---|
858 | ) |
---|
859 | { |
---|
860 | return node->idle; |
---|
861 | } |
---|
862 | |
---|
863 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_set_user( |
---|
864 | Scheduler_Node *node, |
---|
865 | Thread_Control *user |
---|
866 | ) |
---|
867 | { |
---|
868 | node->user = user; |
---|
869 | } |
---|
870 | |
---|
871 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_set_node( |
---|
872 | Thread_Control *the_thread, |
---|
873 | Scheduler_Node *node |
---|
874 | ) |
---|
875 | { |
---|
876 | the_thread->Scheduler.node = node; |
---|
877 | } |
---|
878 | |
---|
879 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_set_scheduler_and_node( |
---|
880 | Thread_Control *the_thread, |
---|
881 | Scheduler_Node *node, |
---|
882 | const Thread_Control *previous_user_of_node |
---|
883 | ) |
---|
884 | { |
---|
885 | const Scheduler_Control *scheduler = |
---|
886 | _Scheduler_Get_own( previous_user_of_node ); |
---|
887 | |
---|
888 | the_thread->Scheduler.control = scheduler; |
---|
889 | _Scheduler_Thread_set_node( the_thread, node ); |
---|
890 | } |
---|
891 | |
---|
892 | extern const bool _Scheduler_Thread_state_valid_state_changes[ 3 ][ 3 ]; |
---|
893 | |
---|
894 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_change_state( |
---|
895 | Thread_Control *the_thread, |
---|
896 | Thread_Scheduler_state new_state |
---|
897 | ) |
---|
898 | { |
---|
899 | _Assert( |
---|
900 | _Scheduler_Thread_state_valid_state_changes |
---|
901 | [ the_thread->Scheduler.state ][ new_state ] |
---|
902 | ); |
---|
903 | |
---|
904 | the_thread->Scheduler.state = new_state; |
---|
905 | } |
---|
906 | |
---|
907 | /** |
---|
908 | * @brief Changes the scheduler help state of a thread. |
---|
909 | * |
---|
910 | * @param[in] the_thread The thread. |
---|
911 | * @param[in] new_help_state The new help state. |
---|
912 | * |
---|
913 | * @return The previous help state. |
---|
914 | */ |
---|
915 | RTEMS_INLINE_ROUTINE Scheduler_Help_state _Scheduler_Thread_change_help_state( |
---|
916 | Thread_Control *the_thread, |
---|
917 | Scheduler_Help_state new_help_state |
---|
918 | ) |
---|
919 | { |
---|
920 | Scheduler_Node *node = _Scheduler_Thread_get_own_node( the_thread ); |
---|
921 | Scheduler_Help_state previous_help_state = node->help_state; |
---|
922 | |
---|
923 | node->help_state = new_help_state; |
---|
924 | |
---|
925 | return previous_help_state; |
---|
926 | } |
---|
927 | |
---|
928 | /** |
---|
929 | * @brief Changes the resource tree root of a thread. |
---|
930 | * |
---|
931 | * For each node of the resource sub-tree specified by the top thread the |
---|
932 | * scheduler asks for help. So the root thread gains access to all scheduler |
---|
933 | * nodes corresponding to the resource sub-tree. In case a thread previously |
---|
934 | * granted help is displaced by this operation, then the scheduler asks for |
---|
935 | * help using its remaining resource tree. |
---|
936 | * |
---|
937 | * The run-time of this function depends on the size of the resource sub-tree |
---|
938 | * and other resource trees in case threads in need for help are produced |
---|
939 | * during this operation. |
---|
940 | * |
---|
941 | * @param[in] top The thread specifying the resource sub-tree top. |
---|
942 | * @param[in] root The thread specifying the new resource sub-tree root. |
---|
943 | */ |
---|
944 | void _Scheduler_Thread_change_resource_root( |
---|
945 | Thread_Control *top, |
---|
946 | Thread_Control *root |
---|
947 | ); |
---|
948 | |
---|
949 | /** |
---|
950 | * @brief Use an idle thread for this scheduler node. |
---|
951 | * |
---|
952 | * A thread in the SCHEDULER_HELP_ACTIVE_OWNER or SCHEDULER_HELP_ACTIVE_RIVAL |
---|
953 | * helping state may use an idle thread for the scheduler node owned by itself |
---|
954 | * in case it executes currently using another scheduler node or in case it is |
---|
955 | * in a blocking state. |
---|
956 | * |
---|
957 | * @param[in] context The scheduler instance context. |
---|
958 | * @param[in] node The node which wants to use the idle thread. |
---|
959 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
960 | */ |
---|
961 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Use_idle_thread( |
---|
962 | Scheduler_Context *context, |
---|
963 | Scheduler_Node *node, |
---|
964 | Scheduler_Get_idle_thread get_idle_thread |
---|
965 | ) |
---|
966 | { |
---|
967 | Thread_Control *idle = ( *get_idle_thread )( context ); |
---|
968 | |
---|
969 | _Assert( |
---|
970 | node->help_state == SCHEDULER_HELP_ACTIVE_OWNER |
---|
971 | || node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL |
---|
972 | ); |
---|
973 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
974 | _Assert( |
---|
975 | _Scheduler_Node_get_owner( node ) == _Scheduler_Node_get_user( node ) |
---|
976 | ); |
---|
977 | |
---|
978 | _Scheduler_Thread_set_node( idle, node ); |
---|
979 | |
---|
980 | _Scheduler_Node_set_user( node, idle ); |
---|
981 | node->idle = idle; |
---|
982 | |
---|
983 | return idle; |
---|
984 | } |
---|
985 | |
---|
986 | /** |
---|
987 | * @brief Try to schedule this scheduler node. |
---|
988 | * |
---|
989 | * @param[in] context The scheduler instance context. |
---|
990 | * @param[in] node The node which wants to get scheduled. |
---|
991 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
992 | * |
---|
993 | * @retval true This node can be scheduled. |
---|
994 | * @retval false Otherwise. |
---|
995 | */ |
---|
996 | RTEMS_INLINE_ROUTINE bool _Scheduler_Try_to_schedule_node( |
---|
997 | Scheduler_Context *context, |
---|
998 | Scheduler_Node *node, |
---|
999 | Scheduler_Get_idle_thread get_idle_thread |
---|
1000 | ) |
---|
1001 | { |
---|
1002 | bool schedule; |
---|
1003 | Thread_Control *owner; |
---|
1004 | Thread_Control *user; |
---|
1005 | |
---|
1006 | if ( node->help_state == SCHEDULER_HELP_YOURSELF ) { |
---|
1007 | return true; |
---|
1008 | } |
---|
1009 | |
---|
1010 | owner = _Scheduler_Node_get_owner( node ); |
---|
1011 | user = _Scheduler_Node_get_user( node ); |
---|
1012 | |
---|
1013 | if ( node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL) { |
---|
1014 | if ( user->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1015 | _Scheduler_Thread_set_scheduler_and_node( user, node, owner ); |
---|
1016 | } else if ( owner->Scheduler.state == THREAD_SCHEDULER_BLOCKED ) { |
---|
1017 | _Scheduler_Use_idle_thread( context, node, get_idle_thread ); |
---|
1018 | } else { |
---|
1019 | _Scheduler_Node_set_user( node, owner ); |
---|
1020 | } |
---|
1021 | |
---|
1022 | schedule = true; |
---|
1023 | } else if ( node->help_state == SCHEDULER_HELP_ACTIVE_OWNER ) { |
---|
1024 | if ( user->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1025 | _Scheduler_Thread_set_scheduler_and_node( user, node, owner ); |
---|
1026 | } else { |
---|
1027 | _Scheduler_Use_idle_thread( context, node, get_idle_thread ); |
---|
1028 | } |
---|
1029 | |
---|
1030 | schedule = true; |
---|
1031 | } else { |
---|
1032 | _Assert( node->help_state == SCHEDULER_HELP_PASSIVE ); |
---|
1033 | |
---|
1034 | if ( user->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1035 | _Scheduler_Thread_set_scheduler_and_node( user, node, owner ); |
---|
1036 | schedule = true; |
---|
1037 | } else { |
---|
1038 | schedule = false; |
---|
1039 | } |
---|
1040 | } |
---|
1041 | |
---|
1042 | return schedule; |
---|
1043 | } |
---|
1044 | |
---|
1045 | /** |
---|
1046 | * @brief Release an idle thread using this scheduler node. |
---|
1047 | * |
---|
1048 | * @param[in] context The scheduler instance context. |
---|
1049 | * @param[in] node The node which may have an idle thread as user. |
---|
1050 | * @param[in] release_idle_thread Function to release an idle thread. |
---|
1051 | * |
---|
1052 | * @retval idle The idle thread which used this node. |
---|
1053 | * @retval NULL This node had no idle thread as an user. |
---|
1054 | */ |
---|
1055 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Release_idle_thread( |
---|
1056 | Scheduler_Context *context, |
---|
1057 | Scheduler_Node *node, |
---|
1058 | Scheduler_Release_idle_thread release_idle_thread |
---|
1059 | ) |
---|
1060 | { |
---|
1061 | Thread_Control *idle = _Scheduler_Node_get_idle( node ); |
---|
1062 | |
---|
1063 | if ( idle != NULL ) { |
---|
1064 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
1065 | |
---|
1066 | node->idle = NULL; |
---|
1067 | _Scheduler_Node_set_user( node, owner ); |
---|
1068 | _Scheduler_Thread_change_state( idle, THREAD_SCHEDULER_READY ); |
---|
1069 | _Scheduler_Thread_set_node( idle, idle->Scheduler.own_node ); |
---|
1070 | |
---|
1071 | ( *release_idle_thread )( context, idle ); |
---|
1072 | } |
---|
1073 | |
---|
1074 | return idle; |
---|
1075 | } |
---|
1076 | |
---|
1077 | /** |
---|
1078 | * @brief Block this scheduler node. |
---|
1079 | * |
---|
1080 | * @param[in] context The scheduler instance context. |
---|
1081 | * @param[in] thread The thread which wants to get blocked referencing this |
---|
1082 | * node. This is not necessarily the user of this node in case the node |
---|
1083 | * participates in the scheduler helping protocol. |
---|
1084 | * @param[in] node The node which wants to get blocked. |
---|
1085 | * @param[in] is_scheduled This node is scheduled. |
---|
1086 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
1087 | * |
---|
1088 | * @retval true Continue with the blocking operation. |
---|
1089 | * @retval false Otherwise. |
---|
1090 | */ |
---|
1091 | RTEMS_INLINE_ROUTINE bool _Scheduler_Block_node( |
---|
1092 | Scheduler_Context *context, |
---|
1093 | Thread_Control *thread, |
---|
1094 | Scheduler_Node *node, |
---|
1095 | bool is_scheduled, |
---|
1096 | Scheduler_Get_idle_thread get_idle_thread |
---|
1097 | ) |
---|
1098 | { |
---|
1099 | Thread_Control *old_user; |
---|
1100 | Thread_Control *new_user; |
---|
1101 | |
---|
1102 | _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_BLOCKED ); |
---|
1103 | |
---|
1104 | if ( node->help_state == SCHEDULER_HELP_YOURSELF ) { |
---|
1105 | _Assert( thread == _Scheduler_Node_get_user( node ) ); |
---|
1106 | |
---|
1107 | return true; |
---|
1108 | } |
---|
1109 | |
---|
1110 | new_user = NULL; |
---|
1111 | |
---|
1112 | if ( node->help_state == SCHEDULER_HELP_ACTIVE_OWNER ) { |
---|
1113 | if ( is_scheduled ) { |
---|
1114 | _Assert( thread == _Scheduler_Node_get_user( node ) ); |
---|
1115 | old_user = thread; |
---|
1116 | new_user = _Scheduler_Use_idle_thread( context, node, get_idle_thread ); |
---|
1117 | } |
---|
1118 | } else if ( node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL ) { |
---|
1119 | if ( is_scheduled ) { |
---|
1120 | old_user = _Scheduler_Node_get_user( node ); |
---|
1121 | |
---|
1122 | if ( thread == old_user ) { |
---|
1123 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
1124 | |
---|
1125 | if ( |
---|
1126 | thread != owner |
---|
1127 | && owner->Scheduler.state == THREAD_SCHEDULER_READY |
---|
1128 | ) { |
---|
1129 | new_user = owner; |
---|
1130 | _Scheduler_Node_set_user( node, new_user ); |
---|
1131 | } else { |
---|
1132 | new_user = _Scheduler_Use_idle_thread( context, node, get_idle_thread ); |
---|
1133 | } |
---|
1134 | } |
---|
1135 | } |
---|
1136 | } else { |
---|
1137 | /* Not implemented, this is part of the OMIP support path. */ |
---|
1138 | _Assert(0); |
---|
1139 | } |
---|
1140 | |
---|
1141 | if ( new_user != NULL ) { |
---|
1142 | Per_CPU_Control *cpu = _Thread_Get_CPU( old_user ); |
---|
1143 | |
---|
1144 | _Scheduler_Thread_change_state( new_user, THREAD_SCHEDULER_SCHEDULED ); |
---|
1145 | _Thread_Set_CPU( new_user, cpu ); |
---|
1146 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), cpu, new_user ); |
---|
1147 | } |
---|
1148 | |
---|
1149 | return false; |
---|
1150 | } |
---|
1151 | |
---|
1152 | /** |
---|
1153 | * @brief Unblock this scheduler node. |
---|
1154 | * |
---|
1155 | * @param[in] context The scheduler instance context. |
---|
1156 | * @param[in] the_thread The thread which wants to get unblocked. |
---|
1157 | * @param[in] node The node which wants to get unblocked. |
---|
1158 | * @param[in] is_scheduled This node is scheduled. |
---|
1159 | * @param[in] release_idle_thread Function to release an idle thread. |
---|
1160 | * |
---|
1161 | * @retval true Continue with the unblocking operation. |
---|
1162 | * @retval false Otherwise. |
---|
1163 | */ |
---|
1164 | RTEMS_INLINE_ROUTINE bool _Scheduler_Unblock_node( |
---|
1165 | Scheduler_Context *context, |
---|
1166 | Thread_Control *the_thread, |
---|
1167 | Scheduler_Node *node, |
---|
1168 | bool is_scheduled, |
---|
1169 | Scheduler_Release_idle_thread release_idle_thread |
---|
1170 | ) |
---|
1171 | { |
---|
1172 | bool unblock; |
---|
1173 | |
---|
1174 | if ( is_scheduled ) { |
---|
1175 | Thread_Control *old_user = _Scheduler_Node_get_user( node ); |
---|
1176 | Per_CPU_Control *cpu = _Thread_Get_CPU( old_user ); |
---|
1177 | Thread_Control *idle = _Scheduler_Release_idle_thread( |
---|
1178 | context, |
---|
1179 | node, |
---|
1180 | release_idle_thread |
---|
1181 | ); |
---|
1182 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
1183 | Thread_Control *new_user; |
---|
1184 | |
---|
1185 | if ( node->help_state == SCHEDULER_HELP_ACTIVE_OWNER ) { |
---|
1186 | _Assert( idle != NULL ); |
---|
1187 | new_user = the_thread; |
---|
1188 | } else if ( idle != NULL ) { |
---|
1189 | _Assert( node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL ); |
---|
1190 | new_user = the_thread; |
---|
1191 | } else if ( the_thread != owner ) { |
---|
1192 | _Assert( node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL ); |
---|
1193 | _Assert( old_user != the_thread ); |
---|
1194 | _Scheduler_Thread_change_state( owner, THREAD_SCHEDULER_READY ); |
---|
1195 | new_user = the_thread; |
---|
1196 | _Scheduler_Node_set_user( node, new_user ); |
---|
1197 | } else { |
---|
1198 | _Assert( node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL ); |
---|
1199 | _Assert( old_user != the_thread ); |
---|
1200 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_READY ); |
---|
1201 | new_user = NULL; |
---|
1202 | } |
---|
1203 | |
---|
1204 | if ( new_user != NULL ) { |
---|
1205 | _Scheduler_Thread_change_state( new_user, THREAD_SCHEDULER_SCHEDULED ); |
---|
1206 | _Thread_Set_CPU( new_user, cpu ); |
---|
1207 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), cpu, new_user ); |
---|
1208 | } |
---|
1209 | |
---|
1210 | unblock = false; |
---|
1211 | } else { |
---|
1212 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_READY ); |
---|
1213 | |
---|
1214 | unblock = true; |
---|
1215 | } |
---|
1216 | |
---|
1217 | return unblock; |
---|
1218 | } |
---|
1219 | |
---|
1220 | /** |
---|
1221 | * @brief Asks a ready scheduler node for help. |
---|
1222 | * |
---|
1223 | * @param[in] node The ready node offering help. |
---|
1224 | * @param[in] needs_help The thread needing help. |
---|
1225 | * |
---|
1226 | * @retval needs_help The thread needing help. |
---|
1227 | */ |
---|
1228 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Ask_ready_node_for_help( |
---|
1229 | Scheduler_Node *node, |
---|
1230 | Thread_Control *needs_help |
---|
1231 | ) |
---|
1232 | { |
---|
1233 | _Scheduler_Node_set_user( node, needs_help ); |
---|
1234 | |
---|
1235 | return needs_help; |
---|
1236 | } |
---|
1237 | |
---|
1238 | /** |
---|
1239 | * @brief Asks a scheduled scheduler node for help. |
---|
1240 | * |
---|
1241 | * @param[in] context The scheduler instance context. |
---|
1242 | * @param[in] node The scheduled node offering help. |
---|
1243 | * @param[in] offers_help The thread offering help. |
---|
1244 | * @param[in] needs_help The thread needing help. |
---|
1245 | * @param[in] previous_accepts_help The previous thread accepting help by this |
---|
1246 | * scheduler node. |
---|
1247 | * @param[in] release_idle_thread Function to release an idle thread. |
---|
1248 | * |
---|
1249 | * @retval needs_help The previous thread accepting help by this scheduler node |
---|
1250 | * which was displaced by the thread needing help. |
---|
1251 | * @retval NULL There are no more threads needing help. |
---|
1252 | */ |
---|
1253 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Ask_scheduled_node_for_help( |
---|
1254 | Scheduler_Context *context, |
---|
1255 | Scheduler_Node *node, |
---|
1256 | Thread_Control *offers_help, |
---|
1257 | Thread_Control *needs_help, |
---|
1258 | Thread_Control *previous_accepts_help, |
---|
1259 | Scheduler_Release_idle_thread release_idle_thread |
---|
1260 | ) |
---|
1261 | { |
---|
1262 | Thread_Control *next_needs_help = NULL; |
---|
1263 | Thread_Control *old_user = NULL; |
---|
1264 | Thread_Control *new_user = NULL; |
---|
1265 | |
---|
1266 | if ( |
---|
1267 | previous_accepts_help != needs_help |
---|
1268 | && _Scheduler_Thread_get_node( previous_accepts_help ) == node |
---|
1269 | ) { |
---|
1270 | Thread_Control *idle = _Scheduler_Release_idle_thread( |
---|
1271 | context, |
---|
1272 | node, |
---|
1273 | release_idle_thread |
---|
1274 | ); |
---|
1275 | |
---|
1276 | if ( idle != NULL ) { |
---|
1277 | old_user = idle; |
---|
1278 | } else { |
---|
1279 | _Assert( _Scheduler_Node_get_user( node ) == previous_accepts_help ); |
---|
1280 | old_user = previous_accepts_help; |
---|
1281 | } |
---|
1282 | |
---|
1283 | if ( needs_help->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1284 | new_user = needs_help; |
---|
1285 | } else { |
---|
1286 | _Assert( |
---|
1287 | node->help_state == SCHEDULER_HELP_ACTIVE_OWNER |
---|
1288 | || node->help_state == SCHEDULER_HELP_ACTIVE_RIVAL |
---|
1289 | ); |
---|
1290 | _Assert( offers_help->Scheduler.node == offers_help->Scheduler.own_node ); |
---|
1291 | |
---|
1292 | new_user = offers_help; |
---|
1293 | } |
---|
1294 | |
---|
1295 | if ( previous_accepts_help != offers_help ) { |
---|
1296 | next_needs_help = previous_accepts_help; |
---|
1297 | } |
---|
1298 | } else if ( needs_help->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1299 | Thread_Control *idle = _Scheduler_Release_idle_thread( |
---|
1300 | context, |
---|
1301 | node, |
---|
1302 | release_idle_thread |
---|
1303 | ); |
---|
1304 | |
---|
1305 | if ( idle != NULL ) { |
---|
1306 | old_user = idle; |
---|
1307 | } else { |
---|
1308 | old_user = _Scheduler_Node_get_user( node ); |
---|
1309 | } |
---|
1310 | |
---|
1311 | new_user = needs_help; |
---|
1312 | } else { |
---|
1313 | _Assert( needs_help->Scheduler.state == THREAD_SCHEDULER_SCHEDULED ); |
---|
1314 | } |
---|
1315 | |
---|
1316 | if ( new_user != old_user ) { |
---|
1317 | Per_CPU_Control *cpu_self = _Per_CPU_Get(); |
---|
1318 | Per_CPU_Control *cpu = _Thread_Get_CPU( old_user ); |
---|
1319 | |
---|
1320 | _Scheduler_Thread_change_state( old_user, THREAD_SCHEDULER_READY ); |
---|
1321 | _Scheduler_Thread_set_scheduler_and_node( |
---|
1322 | old_user, |
---|
1323 | _Scheduler_Thread_get_own_node( old_user ), |
---|
1324 | old_user |
---|
1325 | ); |
---|
1326 | |
---|
1327 | _Scheduler_Thread_change_state( new_user, THREAD_SCHEDULER_SCHEDULED ); |
---|
1328 | _Scheduler_Thread_set_scheduler_and_node( new_user, node, offers_help ); |
---|
1329 | |
---|
1330 | _Scheduler_Node_set_user( node, new_user ); |
---|
1331 | _Thread_Set_CPU( new_user, cpu ); |
---|
1332 | _Thread_Dispatch_update_heir( cpu_self, cpu, new_user ); |
---|
1333 | } |
---|
1334 | |
---|
1335 | return next_needs_help; |
---|
1336 | } |
---|
1337 | |
---|
1338 | /** |
---|
1339 | * @brief Asks a blocked scheduler node for help. |
---|
1340 | * |
---|
1341 | * @param[in] context The scheduler instance context. |
---|
1342 | * @param[in] node The scheduled node offering help. |
---|
1343 | * @param[in] offers_help The thread offering help. |
---|
1344 | * @param[in] needs_help The thread needing help. |
---|
1345 | * |
---|
1346 | * @retval true Enqueue this scheduler node. |
---|
1347 | * @retval false Otherwise. |
---|
1348 | */ |
---|
1349 | RTEMS_INLINE_ROUTINE bool _Scheduler_Ask_blocked_node_for_help( |
---|
1350 | Scheduler_Context *context, |
---|
1351 | Scheduler_Node *node, |
---|
1352 | Thread_Control *offers_help, |
---|
1353 | Thread_Control *needs_help |
---|
1354 | ) |
---|
1355 | { |
---|
1356 | bool enqueue; |
---|
1357 | |
---|
1358 | _Assert( node->help_state == SCHEDULER_HELP_PASSIVE ); |
---|
1359 | |
---|
1360 | if ( needs_help->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
1361 | _Scheduler_Node_set_user( node, needs_help ); |
---|
1362 | _Scheduler_Thread_set_scheduler_and_node( needs_help, node, offers_help ); |
---|
1363 | |
---|
1364 | enqueue = true; |
---|
1365 | } else { |
---|
1366 | enqueue = false; |
---|
1367 | } |
---|
1368 | |
---|
1369 | return enqueue; |
---|
1370 | } |
---|
1371 | #endif |
---|
1372 | |
---|
1373 | /** @} */ |
---|
1374 | |
---|
1375 | #ifdef __cplusplus |
---|
1376 | } |
---|
1377 | #endif |
---|
1378 | |
---|
1379 | #endif |
---|
1380 | /* end of include file */ |
---|