1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief SMP Scheduler Implementation |
---|
5 | * |
---|
6 | * @ingroup ScoreSchedulerSMP |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved. |
---|
11 | * |
---|
12 | * embedded brains GmbH |
---|
13 | * Dornierstr. 4 |
---|
14 | * 82178 Puchheim |
---|
15 | * Germany |
---|
16 | * <rtems@embedded-brains.de> |
---|
17 | * |
---|
18 | * The license and distribution terms for this file may be |
---|
19 | * found in the file LICENSE in this distribution or at |
---|
20 | * http://www.rtems.org/license/LICENSE. |
---|
21 | */ |
---|
22 | |
---|
23 | #ifndef _RTEMS_SCORE_SCHEDULERSMPIMPL_H |
---|
24 | #define _RTEMS_SCORE_SCHEDULERSMPIMPL_H |
---|
25 | |
---|
26 | #include <rtems/score/schedulersmp.h> |
---|
27 | #include <rtems/score/assert.h> |
---|
28 | #include <rtems/score/chainimpl.h> |
---|
29 | #include <rtems/score/schedulersimpleimpl.h> |
---|
30 | |
---|
31 | #ifdef __cplusplus |
---|
32 | extern "C" { |
---|
33 | #endif /* __cplusplus */ |
---|
34 | |
---|
35 | /** |
---|
36 | * @addtogroup ScoreSchedulerSMP |
---|
37 | * |
---|
38 | * The scheduler nodes can be in four states |
---|
39 | * - @ref SCHEDULER_SMP_NODE_BLOCKED, |
---|
40 | * - @ref SCHEDULER_SMP_NODE_SCHEDULED, |
---|
41 | * - @ref SCHEDULER_SMP_NODE_READY, and |
---|
42 | * - @ref SCHEDULER_SMP_NODE_IN_THE_AIR. |
---|
43 | * |
---|
44 | * State transitions are triggered via basic three operations |
---|
45 | * - _Scheduler_SMP_Enqueue_ordered(), |
---|
46 | * - _Scheduler_SMP_Extract(), and |
---|
47 | * - _Scheduler_SMP_Schedule(). |
---|
48 | * |
---|
49 | * @dot |
---|
50 | * digraph { |
---|
51 | * node [style="filled"]; |
---|
52 | * |
---|
53 | * bs [label="BLOCKED"]; |
---|
54 | * ss [label="SCHEDULED", fillcolor="green"]; |
---|
55 | * rs [label="READY", fillcolor="red"]; |
---|
56 | * as [label="IN THE AIR", fillcolor="orange"]; |
---|
57 | * |
---|
58 | * edge [label="enqueue"]; |
---|
59 | * edge [fontcolor="darkgreen", color="darkgreen"]; |
---|
60 | * |
---|
61 | * bs -> ss; |
---|
62 | * as -> ss; |
---|
63 | * |
---|
64 | * edge [label="enqueue"]; |
---|
65 | * edge [fontcolor="red", color="red"]; |
---|
66 | * |
---|
67 | * bs -> rs; |
---|
68 | * as -> rs; |
---|
69 | * |
---|
70 | * edge [label="enqueue other"]; |
---|
71 | * |
---|
72 | * ss -> rs; |
---|
73 | * |
---|
74 | * edge [label="schedule"]; |
---|
75 | * edge [fontcolor="black", color="black"]; |
---|
76 | * |
---|
77 | * as -> bs; |
---|
78 | * |
---|
79 | * edge [label="extract"]; |
---|
80 | * edge [fontcolor="brown", color="brown"]; |
---|
81 | * |
---|
82 | * ss -> as; |
---|
83 | * |
---|
84 | * edge [fontcolor="black", color="black"]; |
---|
85 | * |
---|
86 | * rs -> bs; |
---|
87 | * |
---|
88 | * edge [label="enqueue other\nschedule other"]; |
---|
89 | * edge [fontcolor="darkgreen", color="darkgreen"]; |
---|
90 | * |
---|
91 | * rs -> ss; |
---|
92 | * } |
---|
93 | * @enddot |
---|
94 | * |
---|
95 | * During system initialization each processor of the scheduler instance starts |
---|
96 | * with an idle thread assigned to it. Lets have a look at an example with two |
---|
97 | * idle threads I and J with priority 5. We also have blocked threads A, B and |
---|
98 | * C with priorities 1, 2 and 3 respectively. |
---|
99 | * |
---|
100 | * @dot |
---|
101 | * digraph { |
---|
102 | * node [style="filled"]; |
---|
103 | * edge [dir="none"]; |
---|
104 | * subgraph { |
---|
105 | * rank = same; |
---|
106 | * |
---|
107 | * i [label="I (5)", fillcolor="green"]; |
---|
108 | * j [label="J (5)", fillcolor="green"]; |
---|
109 | * a [label="A (1)"]; |
---|
110 | * b [label="B (2)"]; |
---|
111 | * c [label="C (3)"]; |
---|
112 | * i -> j; |
---|
113 | * } |
---|
114 | * |
---|
115 | * subgraph { |
---|
116 | * rank = same; |
---|
117 | * |
---|
118 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
119 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
120 | * } |
---|
121 | * |
---|
122 | * i -> p0; |
---|
123 | * j -> p1; |
---|
124 | * } |
---|
125 | * @enddot |
---|
126 | * |
---|
127 | * Lets start A. For this an enqueue operation is performed. |
---|
128 | * |
---|
129 | * @dot |
---|
130 | * digraph { |
---|
131 | * node [style="filled"]; |
---|
132 | * edge [dir="none"]; |
---|
133 | * |
---|
134 | * subgraph { |
---|
135 | * rank = same; |
---|
136 | * |
---|
137 | * i [label="I (5)", fillcolor="green"]; |
---|
138 | * j [label="J (5)", fillcolor="red"]; |
---|
139 | * a [label="A (1)", fillcolor="green"]; |
---|
140 | * b [label="B (2)"]; |
---|
141 | * c [label="C (3)"]; |
---|
142 | * a -> i; |
---|
143 | * } |
---|
144 | * |
---|
145 | * subgraph { |
---|
146 | * rank = same; |
---|
147 | * |
---|
148 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
149 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
150 | * } |
---|
151 | * |
---|
152 | * i -> p0; |
---|
153 | * a -> p1; |
---|
154 | * } |
---|
155 | * @enddot |
---|
156 | * |
---|
157 | * Lets start C. |
---|
158 | * |
---|
159 | * @dot |
---|
160 | * digraph { |
---|
161 | * node [style="filled"]; |
---|
162 | * edge [dir="none"]; |
---|
163 | * |
---|
164 | * subgraph { |
---|
165 | * rank = same; |
---|
166 | * |
---|
167 | * a [label="A (1)", fillcolor="green"]; |
---|
168 | * c [label="C (3)", fillcolor="green"]; |
---|
169 | * i [label="I (5)", fillcolor="red"]; |
---|
170 | * j [label="J (5)", fillcolor="red"]; |
---|
171 | * b [label="B (2)"]; |
---|
172 | * a -> c; |
---|
173 | * i -> j; |
---|
174 | * } |
---|
175 | * |
---|
176 | * subgraph { |
---|
177 | * rank = same; |
---|
178 | * |
---|
179 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
180 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
181 | * } |
---|
182 | * |
---|
183 | * c -> p0; |
---|
184 | * a -> p1; |
---|
185 | * } |
---|
186 | * @enddot |
---|
187 | * |
---|
188 | * Lets start B. |
---|
189 | * |
---|
190 | * @dot |
---|
191 | * digraph { |
---|
192 | * node [style="filled"]; |
---|
193 | * edge [dir="none"]; |
---|
194 | * |
---|
195 | * subgraph { |
---|
196 | * rank = same; |
---|
197 | * |
---|
198 | * a [label="A (1)", fillcolor="green"]; |
---|
199 | * b [label="B (2)", fillcolor="green"]; |
---|
200 | * c [label="C (3)", fillcolor="red"]; |
---|
201 | * i [label="I (5)", fillcolor="red"]; |
---|
202 | * j [label="J (5)", fillcolor="red"]; |
---|
203 | * a -> b; |
---|
204 | * c -> i -> j; |
---|
205 | * } |
---|
206 | * |
---|
207 | * subgraph { |
---|
208 | * rank = same; |
---|
209 | * |
---|
210 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
211 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
212 | * } |
---|
213 | * |
---|
214 | * b -> p0; |
---|
215 | * a -> p1; |
---|
216 | * } |
---|
217 | * @enddot |
---|
218 | * |
---|
219 | * Lets do something with A. This can be a blocking operation or a priority |
---|
220 | * change. For this an extract operation is performed first. |
---|
221 | * |
---|
222 | * @dot |
---|
223 | * digraph { |
---|
224 | * node [style="filled"]; |
---|
225 | * edge [dir="none"]; |
---|
226 | * |
---|
227 | * subgraph { |
---|
228 | * rank = same; |
---|
229 | * |
---|
230 | * b [label="B (2)", fillcolor="green"]; |
---|
231 | * a [label="A (1)", fillcolor="orange"]; |
---|
232 | * c [label="C (3)", fillcolor="red"]; |
---|
233 | * i [label="I (5)", fillcolor="red"]; |
---|
234 | * j [label="J (5)", fillcolor="red"]; |
---|
235 | * c -> i -> j; |
---|
236 | * } |
---|
237 | * |
---|
238 | * subgraph { |
---|
239 | * rank = same; |
---|
240 | * |
---|
241 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
242 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
243 | * } |
---|
244 | * |
---|
245 | * b -> p0; |
---|
246 | * a -> p1; |
---|
247 | * } |
---|
248 | * @enddot |
---|
249 | * |
---|
250 | * Lets change the priority of thread A to 4 and enqueue it. |
---|
251 | * |
---|
252 | * @dot |
---|
253 | * digraph { |
---|
254 | * node [style="filled"]; |
---|
255 | * edge [dir="none"]; |
---|
256 | * |
---|
257 | * subgraph { |
---|
258 | * rank = same; |
---|
259 | * |
---|
260 | * b [label="B (2)", fillcolor="green"]; |
---|
261 | * c [label="C (3)", fillcolor="green"]; |
---|
262 | * a [label="A (4)", fillcolor="red"]; |
---|
263 | * i [label="I (5)", fillcolor="red"]; |
---|
264 | * j [label="J (5)", fillcolor="red"]; |
---|
265 | * b -> c; |
---|
266 | * a -> i -> j; |
---|
267 | * } |
---|
268 | * |
---|
269 | * subgraph { |
---|
270 | * rank = same; |
---|
271 | * |
---|
272 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
273 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
274 | * } |
---|
275 | * |
---|
276 | * b -> p0; |
---|
277 | * c -> p1; |
---|
278 | * } |
---|
279 | * @enddot |
---|
280 | * |
---|
281 | * Alternatively we can also do a blocking operation with thread A. In this |
---|
282 | * case schedule will be called. |
---|
283 | * |
---|
284 | * @dot |
---|
285 | * digraph { |
---|
286 | * node [style="filled"]; |
---|
287 | * edge [dir="none"]; |
---|
288 | * |
---|
289 | * subgraph { |
---|
290 | * rank = same; |
---|
291 | * |
---|
292 | * b [label="B (2)", fillcolor="green"]; |
---|
293 | * c [label="C (3)", fillcolor="green"]; |
---|
294 | * i [label="I (5)", fillcolor="red"]; |
---|
295 | * j [label="J (5)", fillcolor="red"]; |
---|
296 | * a [label="A (1)"]; |
---|
297 | * b -> c; |
---|
298 | * i -> j; |
---|
299 | * } |
---|
300 | * |
---|
301 | * subgraph { |
---|
302 | * rank = same; |
---|
303 | * |
---|
304 | * p0 [label="PROCESSOR 0", shape="box"]; |
---|
305 | * p1 [label="PROCESSOR 1", shape="box"]; |
---|
306 | * } |
---|
307 | * |
---|
308 | * b -> p0; |
---|
309 | * c -> p1; |
---|
310 | * } |
---|
311 | * @enddot |
---|
312 | * |
---|
313 | * @{ |
---|
314 | */ |
---|
315 | |
---|
316 | typedef Thread_Control *( *Scheduler_SMP_Get_highest_ready )( |
---|
317 | Scheduler_SMP_Context *self |
---|
318 | ); |
---|
319 | |
---|
320 | typedef void ( *Scheduler_SMP_Extract )( |
---|
321 | Scheduler_SMP_Context *self, |
---|
322 | Thread_Control *thread |
---|
323 | ); |
---|
324 | |
---|
325 | typedef void ( *Scheduler_SMP_Insert )( |
---|
326 | Scheduler_SMP_Context *self, |
---|
327 | Thread_Control *thread_to_insert |
---|
328 | ); |
---|
329 | |
---|
330 | typedef void ( *Scheduler_SMP_Move )( |
---|
331 | Scheduler_SMP_Context *self, |
---|
332 | Thread_Control *thread_to_move |
---|
333 | ); |
---|
334 | |
---|
335 | static inline void _Scheduler_SMP_Initialize( |
---|
336 | Scheduler_SMP_Context *self |
---|
337 | ) |
---|
338 | { |
---|
339 | _Chain_Initialize_empty( &self->Scheduled ); |
---|
340 | } |
---|
341 | |
---|
342 | static inline Scheduler_SMP_Node *_Scheduler_SMP_Node_get( |
---|
343 | Thread_Control *thread |
---|
344 | ) |
---|
345 | { |
---|
346 | return (Scheduler_SMP_Node *) _Scheduler_Node_get( thread ); |
---|
347 | } |
---|
348 | |
---|
349 | static inline void _Scheduler_SMP_Node_initialize( |
---|
350 | Scheduler_SMP_Node *node |
---|
351 | ) |
---|
352 | { |
---|
353 | node->state = SCHEDULER_SMP_NODE_BLOCKED; |
---|
354 | } |
---|
355 | |
---|
356 | extern const bool _Scheduler_SMP_Node_valid_state_changes[ 4 ][ 4 ]; |
---|
357 | |
---|
358 | static inline void _Scheduler_SMP_Node_change_state( |
---|
359 | Scheduler_SMP_Node *node, |
---|
360 | Scheduler_SMP_Node_state new_state |
---|
361 | ) |
---|
362 | { |
---|
363 | _Assert( |
---|
364 | _Scheduler_SMP_Node_valid_state_changes[ node->state ][ new_state ] |
---|
365 | ); |
---|
366 | |
---|
367 | node->state = new_state; |
---|
368 | } |
---|
369 | |
---|
370 | static inline bool _Scheduler_SMP_Is_processor_owned_by_us( |
---|
371 | const Scheduler_SMP_Context *self, |
---|
372 | const Per_CPU_Control *cpu |
---|
373 | ) |
---|
374 | { |
---|
375 | return cpu->scheduler_context == &self->Base; |
---|
376 | } |
---|
377 | |
---|
378 | static inline void _Scheduler_SMP_Update_heir( |
---|
379 | Per_CPU_Control *cpu_self, |
---|
380 | Per_CPU_Control *cpu_for_heir, |
---|
381 | Thread_Control *heir |
---|
382 | ) |
---|
383 | { |
---|
384 | cpu_for_heir->heir = heir; |
---|
385 | |
---|
386 | /* |
---|
387 | * It is critical that we first update the heir and then the dispatch |
---|
388 | * necessary so that _Thread_Get_heir_and_make_it_executing() cannot miss an |
---|
389 | * update. |
---|
390 | */ |
---|
391 | _Atomic_Fence( ATOMIC_ORDER_SEQ_CST ); |
---|
392 | |
---|
393 | /* |
---|
394 | * Only update the dispatch necessary indicator if not already set to |
---|
395 | * avoid superfluous inter-processor interrupts. |
---|
396 | */ |
---|
397 | if ( !cpu_for_heir->dispatch_necessary ) { |
---|
398 | cpu_for_heir->dispatch_necessary = true; |
---|
399 | |
---|
400 | if ( cpu_for_heir != cpu_self ) { |
---|
401 | _Per_CPU_Send_interrupt( cpu_for_heir ); |
---|
402 | } |
---|
403 | } |
---|
404 | } |
---|
405 | |
---|
406 | static inline void _Scheduler_SMP_Allocate_processor( |
---|
407 | Scheduler_SMP_Context *self, |
---|
408 | Thread_Control *scheduled, |
---|
409 | Thread_Control *victim |
---|
410 | ) |
---|
411 | { |
---|
412 | Scheduler_SMP_Node *scheduled_node = _Scheduler_SMP_Node_get( scheduled ); |
---|
413 | Per_CPU_Control *cpu_of_scheduled = _Thread_Get_CPU( scheduled ); |
---|
414 | Per_CPU_Control *cpu_of_victim = _Thread_Get_CPU( victim ); |
---|
415 | Per_CPU_Control *cpu_self = _Per_CPU_Get(); |
---|
416 | Thread_Control *heir; |
---|
417 | |
---|
418 | _Scheduler_SMP_Node_change_state( |
---|
419 | scheduled_node, |
---|
420 | SCHEDULER_SMP_NODE_SCHEDULED |
---|
421 | ); |
---|
422 | |
---|
423 | _Assert( _ISR_Get_level() != 0 ); |
---|
424 | |
---|
425 | if ( _Thread_Is_executing_on_a_processor( scheduled ) ) { |
---|
426 | if ( _Scheduler_SMP_Is_processor_owned_by_us( self, cpu_of_scheduled ) ) { |
---|
427 | heir = cpu_of_scheduled->heir; |
---|
428 | _Scheduler_SMP_Update_heir( cpu_self, cpu_of_scheduled, scheduled ); |
---|
429 | } else { |
---|
430 | /* We have to force a migration to our processor set */ |
---|
431 | _Assert( scheduled->debug_real_cpu->heir != scheduled ); |
---|
432 | heir = scheduled; |
---|
433 | } |
---|
434 | } else { |
---|
435 | heir = scheduled; |
---|
436 | } |
---|
437 | |
---|
438 | if ( heir != victim ) { |
---|
439 | _Thread_Set_CPU( heir, cpu_of_victim ); |
---|
440 | _Scheduler_SMP_Update_heir( cpu_self, cpu_of_victim, heir ); |
---|
441 | } |
---|
442 | } |
---|
443 | |
---|
444 | static inline Thread_Control *_Scheduler_SMP_Get_lowest_scheduled( |
---|
445 | Scheduler_SMP_Context *self |
---|
446 | ) |
---|
447 | { |
---|
448 | Thread_Control *lowest_ready = NULL; |
---|
449 | Chain_Control *scheduled = &self->Scheduled; |
---|
450 | |
---|
451 | if ( !_Chain_Is_empty( scheduled ) ) { |
---|
452 | lowest_ready = (Thread_Control *) _Chain_Last( scheduled ); |
---|
453 | } |
---|
454 | |
---|
455 | return lowest_ready; |
---|
456 | } |
---|
457 | |
---|
458 | /** |
---|
459 | * @brief Enqueues a thread according to the specified order function. |
---|
460 | * |
---|
461 | * @param[in] context The scheduler instance context. |
---|
462 | * @param[in] thread The thread to enqueue. |
---|
463 | * @param[in] order The order function. |
---|
464 | * @param[in] get_highest_ready Function to get the highest ready node. |
---|
465 | * @param[in] insert_ready Function to insert a node into the set of ready |
---|
466 | * nodes. |
---|
467 | * @param[in] insert_scheduled Function to insert a node into the set of |
---|
468 | * scheduled nodes. |
---|
469 | * @param[in] move_from_ready_to_scheduled Function to move a node from the set |
---|
470 | * of ready nodes to the set of scheduled nodes. |
---|
471 | * @param[in] move_from_scheduled_to_ready Function to move a node from the set |
---|
472 | * of scheduled nodes to the set of ready nodes. |
---|
473 | */ |
---|
474 | static inline void _Scheduler_SMP_Enqueue_ordered( |
---|
475 | Scheduler_SMP_Context *self, |
---|
476 | Thread_Control *thread, |
---|
477 | Chain_Node_order order, |
---|
478 | Scheduler_SMP_Get_highest_ready get_highest_ready, |
---|
479 | Scheduler_SMP_Insert insert_ready, |
---|
480 | Scheduler_SMP_Insert insert_scheduled, |
---|
481 | Scheduler_SMP_Move move_from_ready_to_scheduled, |
---|
482 | Scheduler_SMP_Move move_from_scheduled_to_ready |
---|
483 | ) |
---|
484 | { |
---|
485 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_get( thread ); |
---|
486 | |
---|
487 | if ( node->state == SCHEDULER_SMP_NODE_IN_THE_AIR ) { |
---|
488 | Thread_Control *highest_ready = ( *get_highest_ready )( self ); |
---|
489 | |
---|
490 | /* |
---|
491 | * The thread has been extracted from the scheduled chain. We have to |
---|
492 | * place it now on the scheduled or ready chain. |
---|
493 | * |
---|
494 | * NOTE: Do not exchange parameters to do the negation of the order check. |
---|
495 | */ |
---|
496 | if ( |
---|
497 | highest_ready != NULL |
---|
498 | && !( *order )( &thread->Object.Node, &highest_ready->Object.Node ) |
---|
499 | ) { |
---|
500 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_READY ); |
---|
501 | _Scheduler_SMP_Allocate_processor( self, highest_ready, thread ); |
---|
502 | ( *insert_ready )( self, thread ); |
---|
503 | ( *move_from_ready_to_scheduled )( self, highest_ready ); |
---|
504 | } else { |
---|
505 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_SCHEDULED ); |
---|
506 | ( *insert_scheduled )( self, thread ); |
---|
507 | } |
---|
508 | } else { |
---|
509 | Thread_Control *lowest_scheduled = _Scheduler_SMP_Get_lowest_scheduled( self ); |
---|
510 | |
---|
511 | /* |
---|
512 | * The scheduled chain is empty if nested interrupts change the priority of |
---|
513 | * all scheduled threads. These threads are in the air. |
---|
514 | */ |
---|
515 | if ( |
---|
516 | lowest_scheduled != NULL |
---|
517 | && ( *order )( &thread->Object.Node, &lowest_scheduled->Object.Node ) |
---|
518 | ) { |
---|
519 | Scheduler_SMP_Node *lowest_scheduled_node = |
---|
520 | _Scheduler_SMP_Node_get( lowest_scheduled ); |
---|
521 | |
---|
522 | _Scheduler_SMP_Node_change_state( |
---|
523 | lowest_scheduled_node, |
---|
524 | SCHEDULER_SMP_NODE_READY |
---|
525 | ); |
---|
526 | _Scheduler_SMP_Allocate_processor( self, thread, lowest_scheduled ); |
---|
527 | ( *insert_scheduled )( self, thread ); |
---|
528 | ( *move_from_scheduled_to_ready )( self, lowest_scheduled ); |
---|
529 | } else { |
---|
530 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_READY ); |
---|
531 | ( *insert_ready )( self, thread ); |
---|
532 | } |
---|
533 | } |
---|
534 | } |
---|
535 | |
---|
536 | static inline void _Scheduler_SMP_Schedule_highest_ready( |
---|
537 | Scheduler_SMP_Context *self, |
---|
538 | Thread_Control *victim, |
---|
539 | Scheduler_SMP_Get_highest_ready get_highest_ready, |
---|
540 | Scheduler_SMP_Move move_from_ready_to_scheduled |
---|
541 | ) |
---|
542 | { |
---|
543 | Thread_Control *highest_ready = ( *get_highest_ready )( self ); |
---|
544 | |
---|
545 | _Scheduler_SMP_Allocate_processor( self, highest_ready, victim ); |
---|
546 | |
---|
547 | ( *move_from_ready_to_scheduled )( self, highest_ready ); |
---|
548 | } |
---|
549 | |
---|
550 | /** |
---|
551 | * @brief Finalize a scheduling operation. |
---|
552 | * |
---|
553 | * @param[in] context The scheduler instance context. |
---|
554 | * @param[in] thread The thread of the scheduling operation. |
---|
555 | * @param[in] get_highest_ready Function to get the highest ready node. |
---|
556 | * @param[in] move_from_ready_to_scheduled Function to move a node from the set |
---|
557 | * of ready nodes to the set of scheduled nodes. |
---|
558 | */ |
---|
559 | static inline void _Scheduler_SMP_Schedule( |
---|
560 | Scheduler_SMP_Context *self, |
---|
561 | Thread_Control *thread, |
---|
562 | Scheduler_SMP_Get_highest_ready get_highest_ready, |
---|
563 | Scheduler_SMP_Move move_from_ready_to_scheduled |
---|
564 | ) |
---|
565 | { |
---|
566 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_get( thread ); |
---|
567 | |
---|
568 | if ( node->state == SCHEDULER_SMP_NODE_IN_THE_AIR ) { |
---|
569 | _Scheduler_SMP_Node_change_state( node, SCHEDULER_SMP_NODE_BLOCKED ); |
---|
570 | |
---|
571 | _Scheduler_SMP_Schedule_highest_ready( |
---|
572 | self, |
---|
573 | thread, |
---|
574 | get_highest_ready, |
---|
575 | move_from_ready_to_scheduled |
---|
576 | ); |
---|
577 | } |
---|
578 | } |
---|
579 | |
---|
580 | static inline void _Scheduler_SMP_Block( |
---|
581 | Scheduler_SMP_Context *self, |
---|
582 | Thread_Control *thread, |
---|
583 | Scheduler_SMP_Extract extract, |
---|
584 | Scheduler_SMP_Get_highest_ready get_highest_ready, |
---|
585 | Scheduler_SMP_Move move_from_ready_to_scheduled |
---|
586 | ) |
---|
587 | { |
---|
588 | ( *extract )( self, thread ); |
---|
589 | |
---|
590 | _Scheduler_SMP_Schedule( |
---|
591 | self, |
---|
592 | thread, |
---|
593 | get_highest_ready, |
---|
594 | move_from_ready_to_scheduled |
---|
595 | ); |
---|
596 | } |
---|
597 | |
---|
598 | /** |
---|
599 | * @brief Extracts a thread from the set of scheduled or ready nodes. |
---|
600 | * |
---|
601 | * @param[in] context The scheduler instance context. |
---|
602 | * @param[in] thread The thread to extract. |
---|
603 | * @param[in] extract Function to extract a node from the set of scheduled or |
---|
604 | * ready nodes. |
---|
605 | */ |
---|
606 | static inline void _Scheduler_SMP_Extract( |
---|
607 | Scheduler_SMP_Context *self, |
---|
608 | Thread_Control *thread, |
---|
609 | Scheduler_SMP_Extract extract |
---|
610 | ) |
---|
611 | { |
---|
612 | ( *extract )( self, thread ); |
---|
613 | } |
---|
614 | |
---|
615 | static inline void _Scheduler_SMP_Insert_scheduled_lifo( |
---|
616 | Scheduler_SMP_Context *self, |
---|
617 | Thread_Control *thread |
---|
618 | ) |
---|
619 | { |
---|
620 | _Chain_Insert_ordered_unprotected( |
---|
621 | &self->Scheduled, |
---|
622 | &thread->Object.Node, |
---|
623 | _Scheduler_simple_Insert_priority_lifo_order |
---|
624 | ); |
---|
625 | } |
---|
626 | |
---|
627 | static inline void _Scheduler_SMP_Insert_scheduled_fifo( |
---|
628 | Scheduler_SMP_Context *self, |
---|
629 | Thread_Control *thread |
---|
630 | ) |
---|
631 | { |
---|
632 | _Chain_Insert_ordered_unprotected( |
---|
633 | &self->Scheduled, |
---|
634 | &thread->Object.Node, |
---|
635 | _Scheduler_simple_Insert_priority_fifo_order |
---|
636 | ); |
---|
637 | } |
---|
638 | |
---|
639 | static inline void _Scheduler_SMP_Start_idle( |
---|
640 | Scheduler_SMP_Context *self, |
---|
641 | Thread_Control *thread, |
---|
642 | Per_CPU_Control *cpu |
---|
643 | ) |
---|
644 | { |
---|
645 | Scheduler_SMP_Node *node = _Scheduler_SMP_Node_get( thread ); |
---|
646 | |
---|
647 | node->state = SCHEDULER_SMP_NODE_SCHEDULED; |
---|
648 | |
---|
649 | _Thread_Set_CPU( thread, cpu ); |
---|
650 | _Chain_Append_unprotected( &self->Scheduled, &thread->Object.Node ); |
---|
651 | } |
---|
652 | |
---|
653 | /** @} */ |
---|
654 | |
---|
655 | #ifdef __cplusplus |
---|
656 | } |
---|
657 | #endif /* __cplusplus */ |
---|
658 | |
---|
659 | #endif /* _RTEMS_SCORE_SCHEDULERSMPIMPL_H */ |
---|