1 | /* |
---|
2 | * Thread Queue Handler |
---|
3 | * |
---|
4 | * |
---|
5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
---|
6 | * On-Line Applications Research Corporation (OAR). |
---|
7 | * All rights assigned to U.S. Government, 1994. |
---|
8 | * |
---|
9 | * This material may be reproduced by or for the U.S. Government pursuant |
---|
10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
---|
11 | * notice must appear in all copies of this file and its derivatives. |
---|
12 | * |
---|
13 | * $Id$ |
---|
14 | */ |
---|
15 | |
---|
16 | #include <rtems/system.h> |
---|
17 | #include <rtems/chain.h> |
---|
18 | #include <rtems/isr.h> |
---|
19 | #include <rtems/object.h> |
---|
20 | #include <rtems/states.h> |
---|
21 | #include <rtems/thread.h> |
---|
22 | #include <rtems/threadq.h> |
---|
23 | #include <rtems/tqdata.h> |
---|
24 | |
---|
25 | /*PAGE |
---|
26 | * |
---|
27 | * _Thread_queue_Initialize |
---|
28 | * |
---|
29 | * This routine initializes the specified threadq. |
---|
30 | * |
---|
31 | * Input parameters: |
---|
32 | * the_thread_queue - pointer to a threadq header |
---|
33 | * the_class - class of the object to which this belongs |
---|
34 | * discipline - queueing discipline |
---|
35 | * state - state of waiting threads |
---|
36 | * |
---|
37 | * Output parameters: NONE |
---|
38 | */ |
---|
39 | |
---|
40 | void _Thread_queue_Initialize( |
---|
41 | Thread_queue_Control *the_thread_queue, |
---|
42 | Objects_Classes the_class, |
---|
43 | Thread_queue_Disciplines the_discipline, |
---|
44 | States_Control state, |
---|
45 | Thread_queue_Extract_callout proxy_extract_callout |
---|
46 | ) |
---|
47 | { |
---|
48 | unsigned32 index; |
---|
49 | |
---|
50 | _Thread_queue_Extract_table[ the_class ] = proxy_extract_callout; |
---|
51 | |
---|
52 | the_thread_queue->state = state; |
---|
53 | the_thread_queue->discipline = the_discipline; |
---|
54 | |
---|
55 | switch ( the_discipline ) { |
---|
56 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
---|
57 | _Chain_Initialize_empty( &the_thread_queue->Queues.Fifo ); |
---|
58 | break; |
---|
59 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
---|
60 | for( index=0 ; |
---|
61 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
62 | index++) |
---|
63 | _Chain_Initialize_empty( &the_thread_queue->Queues.Priority[index] ); |
---|
64 | break; |
---|
65 | } |
---|
66 | |
---|
67 | } |
---|
68 | |
---|
69 | /*PAGE |
---|
70 | * |
---|
71 | * _Thread_queue_Enqueue |
---|
72 | * |
---|
73 | * This routine blocks a thread, places it on a thread, and optionally |
---|
74 | * starts a timeout timer. |
---|
75 | * |
---|
76 | * Input parameters: |
---|
77 | * the_thread_queue - pointer to threadq |
---|
78 | * timeout - interval to wait |
---|
79 | * |
---|
80 | * Output parameters: NONE |
---|
81 | * |
---|
82 | * INTERRUPT LATENCY: |
---|
83 | * only case |
---|
84 | */ |
---|
85 | |
---|
86 | void _Thread_queue_Enqueue( |
---|
87 | Thread_queue_Control *the_thread_queue, |
---|
88 | rtems_interval timeout |
---|
89 | ) |
---|
90 | { |
---|
91 | Thread_Control *the_thread; |
---|
92 | |
---|
93 | the_thread = _Thread_Executing; |
---|
94 | |
---|
95 | if ( _Thread_MP_Is_receive( the_thread ) ) |
---|
96 | the_thread = _Thread_MP_Allocate_proxy( the_thread_queue->state ); |
---|
97 | else |
---|
98 | _Thread_Set_state( the_thread, the_thread_queue->state ); |
---|
99 | |
---|
100 | if ( timeout ) { |
---|
101 | _Watchdog_Initialize( |
---|
102 | &the_thread->Timer, |
---|
103 | _Thread_queue_Timeout, |
---|
104 | the_thread->Object.id, |
---|
105 | NULL |
---|
106 | ); |
---|
107 | |
---|
108 | _Watchdog_Insert_ticks( |
---|
109 | &the_thread->Timer, |
---|
110 | timeout, |
---|
111 | WATCHDOG_NO_ACTIVATE |
---|
112 | ); |
---|
113 | } |
---|
114 | |
---|
115 | switch( the_thread_queue->discipline ) { |
---|
116 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
---|
117 | _Thread_queue_Enqueue_fifo( the_thread_queue, the_thread, timeout ); |
---|
118 | break; |
---|
119 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
---|
120 | _Thread_queue_Enqueue_priority( |
---|
121 | the_thread_queue, the_thread, timeout ); |
---|
122 | break; |
---|
123 | } |
---|
124 | } |
---|
125 | |
---|
126 | /*PAGE |
---|
127 | * |
---|
128 | * _Thread_queue_Dequeue |
---|
129 | * |
---|
130 | * This routine removes a thread from the specified threadq. If the |
---|
131 | * threadq discipline is RTEMS_FIFO, it unblocks a thread, and cancels its |
---|
132 | * timeout timer. Priority discipline is processed elsewhere. |
---|
133 | * |
---|
134 | * Input parameters: |
---|
135 | * the_thread_queue - pointer to threadq |
---|
136 | * |
---|
137 | * Output parameters: |
---|
138 | * returns - thread dequeued or NULL |
---|
139 | * |
---|
140 | * INTERRUPT LATENCY: |
---|
141 | * check sync |
---|
142 | * RTEMS_FIFO |
---|
143 | */ |
---|
144 | |
---|
145 | Thread_Control *_Thread_queue_Dequeue( |
---|
146 | Thread_queue_Control *the_thread_queue |
---|
147 | ) |
---|
148 | { |
---|
149 | Thread_Control *the_thread; |
---|
150 | ISR_Level level; |
---|
151 | |
---|
152 | switch ( the_thread_queue->discipline ) { |
---|
153 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
---|
154 | the_thread = _Thread_queue_Dequeue_fifo( the_thread_queue ); |
---|
155 | break; |
---|
156 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
---|
157 | the_thread = _Thread_queue_Dequeue_priority( the_thread_queue ); |
---|
158 | break; |
---|
159 | default: /* this is only to prevent warnings */ |
---|
160 | the_thread = NULL; |
---|
161 | break; |
---|
162 | } |
---|
163 | |
---|
164 | if ( !_Thread_Is_null( the_thread ) ) |
---|
165 | return( the_thread ); |
---|
166 | |
---|
167 | _ISR_Disable( level ); |
---|
168 | if ( the_thread_queue->sync == FALSE ) { |
---|
169 | _ISR_Enable( level ); |
---|
170 | return( NULL ); |
---|
171 | } |
---|
172 | |
---|
173 | the_thread_queue->sync = FALSE; |
---|
174 | _ISR_Enable( level ); |
---|
175 | return( _Thread_Executing ); |
---|
176 | } |
---|
177 | |
---|
178 | /*PAGE |
---|
179 | * |
---|
180 | * _Thread_queue_Extract_with_proxy |
---|
181 | * |
---|
182 | * This routine extracts the_thread from the_thread_queue |
---|
183 | * and insures that if there is a proxy for this task on |
---|
184 | * another node, it is also dealt with. |
---|
185 | * |
---|
186 | * XXX |
---|
187 | */ |
---|
188 | |
---|
189 | boolean _Thread_queue_Extract_with_proxy( |
---|
190 | Thread_Control *the_thread |
---|
191 | ) |
---|
192 | { |
---|
193 | States_Control state; |
---|
194 | Objects_Classes the_class; |
---|
195 | Thread_queue_Extract_callout proxy_extract_callout; |
---|
196 | |
---|
197 | state = the_thread->current_state; |
---|
198 | |
---|
199 | if ( _States_Is_waiting_on_thread_queue( state ) ) { |
---|
200 | if ( _States_Is_waiting_for_rpc_reply( state ) && |
---|
201 | _States_Is_locally_blocked( state ) ) { |
---|
202 | |
---|
203 | the_class = rtems_get_class( the_thread->Wait.id ); |
---|
204 | |
---|
205 | proxy_extract_callout = _Thread_queue_Extract_table[ the_class ]; |
---|
206 | |
---|
207 | if ( proxy_extract_callout ) |
---|
208 | (*proxy_extract_callout)( the_thread ); |
---|
209 | } |
---|
210 | _Thread_queue_Extract( the_thread->Wait.queue, the_thread ); |
---|
211 | |
---|
212 | return TRUE; |
---|
213 | } |
---|
214 | return FALSE; |
---|
215 | } |
---|
216 | |
---|
217 | /*PAGE |
---|
218 | * |
---|
219 | * _Thread_queue_Extract |
---|
220 | * |
---|
221 | * This routine removes a specific thread from the specified threadq, |
---|
222 | * deletes any timeout, and unblocks the thread. |
---|
223 | * |
---|
224 | * Input parameters: |
---|
225 | * the_thread_queue - pointer to a threadq header |
---|
226 | * the_thread - pointer to a thread control block |
---|
227 | * |
---|
228 | * Output parameters: NONE |
---|
229 | * |
---|
230 | * INTERRUPT LATENCY: NONE |
---|
231 | */ |
---|
232 | |
---|
233 | void _Thread_queue_Extract( |
---|
234 | Thread_queue_Control *the_thread_queue, |
---|
235 | Thread_Control *the_thread |
---|
236 | ) |
---|
237 | { |
---|
238 | switch ( the_thread_queue->discipline ) { |
---|
239 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
---|
240 | _Thread_queue_Extract_fifo( the_thread_queue, the_thread ); |
---|
241 | break; |
---|
242 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
---|
243 | _Thread_queue_Extract_priority( the_thread_queue, the_thread ); |
---|
244 | break; |
---|
245 | } |
---|
246 | } |
---|
247 | |
---|
248 | /*PAGE |
---|
249 | * |
---|
250 | * _Thread_queue_Flush |
---|
251 | * |
---|
252 | * This kernel routine flushes the given thread queue. |
---|
253 | * |
---|
254 | * Input parameters: |
---|
255 | * the_thread_queue - pointer to threadq to be flushed |
---|
256 | * |
---|
257 | * Output parameters: NONE |
---|
258 | */ |
---|
259 | |
---|
260 | void _Thread_queue_Flush( |
---|
261 | Thread_queue_Control *the_thread_queue, |
---|
262 | Thread_queue_Flush_callout remote_extract_callout |
---|
263 | ) |
---|
264 | { |
---|
265 | Thread_Control *the_thread; |
---|
266 | |
---|
267 | while ( (the_thread = _Thread_queue_Dequeue( the_thread_queue )) ) { |
---|
268 | if ( _Objects_Is_local_id( the_thread->Object.id ) ) |
---|
269 | the_thread->Wait.return_code = RTEMS_OBJECT_WAS_DELETED; |
---|
270 | else |
---|
271 | ( *remote_extract_callout )( the_thread ); |
---|
272 | } |
---|
273 | } |
---|
274 | |
---|
275 | /*PAGE |
---|
276 | * |
---|
277 | * _Thread_queue_First |
---|
278 | * |
---|
279 | * This routines returns a pointer to the first thread on the |
---|
280 | * specified threadq. |
---|
281 | * |
---|
282 | * Input parameters: |
---|
283 | * the_thread_queue - pointer to thread queue |
---|
284 | * |
---|
285 | * Output parameters: |
---|
286 | * returns - first thread or NULL |
---|
287 | */ |
---|
288 | |
---|
289 | Thread_Control *_Thread_queue_First( |
---|
290 | Thread_queue_Control *the_thread_queue |
---|
291 | ) |
---|
292 | { |
---|
293 | Thread_Control *the_thread; |
---|
294 | |
---|
295 | switch ( the_thread_queue->discipline ) { |
---|
296 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
---|
297 | the_thread = _Thread_queue_First_fifo( the_thread_queue ); |
---|
298 | break; |
---|
299 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
---|
300 | the_thread = _Thread_queue_First_priority( the_thread_queue ); |
---|
301 | break; |
---|
302 | default: /* this is only to prevent warnings */ |
---|
303 | the_thread = NULL; |
---|
304 | break; |
---|
305 | } |
---|
306 | |
---|
307 | return the_thread; |
---|
308 | } |
---|
309 | |
---|
310 | /*PAGE |
---|
311 | * |
---|
312 | * _Thread_queue_Timeout |
---|
313 | * |
---|
314 | * This routine processes a thread which timeouts while waiting on |
---|
315 | * a thread queue. It is called by the watchdog handler. |
---|
316 | * |
---|
317 | * Input parameters: |
---|
318 | * id - thread id |
---|
319 | * |
---|
320 | * Output parameters: NONE |
---|
321 | */ |
---|
322 | |
---|
323 | void _Thread_queue_Timeout( |
---|
324 | Objects_Id id, |
---|
325 | void *ignored |
---|
326 | ) |
---|
327 | { |
---|
328 | Thread_Control *the_thread; |
---|
329 | Objects_Locations location; |
---|
330 | |
---|
331 | the_thread = _Thread_Get( id, &location ); |
---|
332 | switch ( location ) { |
---|
333 | case OBJECTS_ERROR: |
---|
334 | case OBJECTS_REMOTE: /* impossible */ |
---|
335 | break; |
---|
336 | case OBJECTS_LOCAL: |
---|
337 | the_thread->Wait.return_code = RTEMS_TIMEOUT; |
---|
338 | _Thread_queue_Extract( the_thread->Wait.queue, the_thread ); |
---|
339 | _Thread_Unnest_dispatch(); |
---|
340 | break; |
---|
341 | } |
---|
342 | } |
---|
343 | |
---|
344 | /*PAGE |
---|
345 | * |
---|
346 | * _Thread_queue_Enqueue_fifo |
---|
347 | * |
---|
348 | * This routine blocks a thread, places it on a thread, and optionally |
---|
349 | * starts a timeout timer. |
---|
350 | * |
---|
351 | * Input parameters: |
---|
352 | * the_thread_queue - pointer to threadq |
---|
353 | * the_thread - pointer to the thread to block |
---|
354 | * timeout - interval to wait |
---|
355 | * |
---|
356 | * Output parameters: NONE |
---|
357 | * |
---|
358 | * INTERRUPT LATENCY: |
---|
359 | * only case |
---|
360 | */ |
---|
361 | |
---|
362 | void _Thread_queue_Enqueue_fifo ( |
---|
363 | Thread_queue_Control *the_thread_queue, |
---|
364 | Thread_Control *the_thread, |
---|
365 | rtems_interval timeout |
---|
366 | ) |
---|
367 | { |
---|
368 | ISR_Level level; |
---|
369 | |
---|
370 | _ISR_Disable( level ); |
---|
371 | if ( the_thread_queue->sync == TRUE ) { |
---|
372 | the_thread_queue->sync = FALSE; |
---|
373 | |
---|
374 | _Chain_Append_unprotected( |
---|
375 | &the_thread_queue->Queues.Fifo, |
---|
376 | &the_thread->Object.Node |
---|
377 | ); |
---|
378 | |
---|
379 | if ( timeout != RTEMS_NO_TIMEOUT ) |
---|
380 | _Watchdog_Activate( &the_thread->Timer ); |
---|
381 | |
---|
382 | _ISR_Enable( level ); |
---|
383 | return; |
---|
384 | } |
---|
385 | |
---|
386 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
387 | _ISR_Enable( level ); |
---|
388 | _Thread_Unblock( the_thread ); |
---|
389 | } else { |
---|
390 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
391 | _ISR_Enable( level ); |
---|
392 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
393 | _Thread_Unblock( the_thread ); |
---|
394 | } |
---|
395 | |
---|
396 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
397 | _Thread_MP_Free_proxy( the_thread ); |
---|
398 | |
---|
399 | } |
---|
400 | |
---|
401 | /*PAGE |
---|
402 | * |
---|
403 | * _Thread_queue_Dequeue_fifo |
---|
404 | * |
---|
405 | * This routine removes a thread from the specified threadq. |
---|
406 | * |
---|
407 | * Input parameters: |
---|
408 | * the_thread_queue - pointer to threadq |
---|
409 | * |
---|
410 | * Output parameters: |
---|
411 | * returns - thread dequeued or NULL |
---|
412 | * |
---|
413 | * INTERRUPT LATENCY: |
---|
414 | * check sync |
---|
415 | * RTEMS_FIFO |
---|
416 | */ |
---|
417 | |
---|
418 | Thread_Control *_Thread_queue_Dequeue_fifo( |
---|
419 | Thread_queue_Control *the_thread_queue |
---|
420 | ) |
---|
421 | { |
---|
422 | ISR_Level level; |
---|
423 | Thread_Control *the_thread; |
---|
424 | |
---|
425 | _ISR_Disable( level ); |
---|
426 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) { |
---|
427 | |
---|
428 | the_thread = (Thread_Control *) |
---|
429 | _Chain_Get_first_unprotected( &the_thread_queue->Queues.Fifo ); |
---|
430 | |
---|
431 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
432 | _ISR_Enable( level ); |
---|
433 | _Thread_Unblock( the_thread ); |
---|
434 | } else { |
---|
435 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
436 | _ISR_Enable( level ); |
---|
437 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
438 | _Thread_Unblock( the_thread ); |
---|
439 | } |
---|
440 | |
---|
441 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
442 | _Thread_MP_Free_proxy( the_thread ); |
---|
443 | |
---|
444 | return( the_thread ); |
---|
445 | } |
---|
446 | _ISR_Enable( level ); |
---|
447 | return( NULL ); |
---|
448 | } |
---|
449 | |
---|
450 | /*PAGE |
---|
451 | * |
---|
452 | * _Thread_queue_Extract_fifo |
---|
453 | * |
---|
454 | * This routine removes a specific thread from the specified threadq, |
---|
455 | * deletes any timeout, and unblocks the thread. |
---|
456 | * |
---|
457 | * Input parameters: |
---|
458 | * the_thread_queue - pointer to a threadq header |
---|
459 | * the_thread - pointer to the thread to block |
---|
460 | * |
---|
461 | * Output parameters: NONE |
---|
462 | * |
---|
463 | * INTERRUPT LATENCY: |
---|
464 | * EXTRACT_FIFO |
---|
465 | */ |
---|
466 | |
---|
467 | void _Thread_queue_Extract_fifo( |
---|
468 | Thread_queue_Control *the_thread_queue, |
---|
469 | Thread_Control *the_thread |
---|
470 | ) |
---|
471 | { |
---|
472 | ISR_Level level; |
---|
473 | |
---|
474 | _ISR_Disable( level ); |
---|
475 | |
---|
476 | if ( !_States_Is_waiting_on_thread_queue( the_thread->current_state ) ) { |
---|
477 | _ISR_Enable( level ); |
---|
478 | return; |
---|
479 | } |
---|
480 | |
---|
481 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
---|
482 | |
---|
483 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
484 | _ISR_Enable( level ); |
---|
485 | } else { |
---|
486 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
487 | _ISR_Enable( level ); |
---|
488 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
489 | } |
---|
490 | |
---|
491 | _Thread_Unblock( the_thread ); |
---|
492 | |
---|
493 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
494 | _Thread_MP_Free_proxy( the_thread ); |
---|
495 | |
---|
496 | } |
---|
497 | |
---|
498 | /*PAGE |
---|
499 | * |
---|
500 | * _Thread_queue_First_fifo |
---|
501 | * |
---|
502 | * This routines returns a pointer to the first thread on the |
---|
503 | * specified threadq. |
---|
504 | * |
---|
505 | * Input parameters: |
---|
506 | * the_thread_queue - pointer to threadq |
---|
507 | * |
---|
508 | * Output parameters: |
---|
509 | * returns - first thread or NULL |
---|
510 | */ |
---|
511 | |
---|
512 | Thread_Control *_Thread_queue_First_fifo( |
---|
513 | Thread_queue_Control *the_thread_queue |
---|
514 | ) |
---|
515 | { |
---|
516 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) |
---|
517 | return (Thread_Control *) the_thread_queue->Queues.Fifo.first; |
---|
518 | |
---|
519 | return NULL; |
---|
520 | } |
---|
521 | |
---|
522 | /*PAGE |
---|
523 | * |
---|
524 | * _Thread_queue_Enqueue_priority |
---|
525 | * |
---|
526 | * This routine blocks a thread, places it on a thread, and optionally |
---|
527 | * starts a timeout timer. |
---|
528 | * |
---|
529 | * Input parameters: |
---|
530 | * the_thread_queue - pointer to threadq |
---|
531 | * thread - thread to insert |
---|
532 | * timeout - timeout interval in ticks |
---|
533 | * |
---|
534 | * Output parameters: NONE |
---|
535 | * |
---|
536 | * INTERRUPT LATENCY: |
---|
537 | * forward less than |
---|
538 | * forward equal |
---|
539 | */ |
---|
540 | |
---|
541 | void _Thread_queue_Enqueue_priority( |
---|
542 | Thread_queue_Control *the_thread_queue, |
---|
543 | Thread_Control *the_thread, |
---|
544 | rtems_interval timeout |
---|
545 | ) |
---|
546 | { |
---|
547 | Priority_Control search_priority; |
---|
548 | Thread_Control *search_thread; |
---|
549 | ISR_Level level; |
---|
550 | Chain_Control *header; |
---|
551 | unsigned32 header_index; |
---|
552 | Chain_Node *the_node; |
---|
553 | Chain_Node *next_node; |
---|
554 | Chain_Node *previous_node; |
---|
555 | Chain_Node *search_node; |
---|
556 | Priority_Control priority; |
---|
557 | States_Control block_state; |
---|
558 | |
---|
559 | _Chain_Initialize_empty( &the_thread->Wait.Block2n ); |
---|
560 | |
---|
561 | priority = the_thread->current_priority; |
---|
562 | header_index = _Thread_queue_Header_number( priority ); |
---|
563 | header = &the_thread_queue->Queues.Priority[ header_index ]; |
---|
564 | block_state = the_thread_queue->state; |
---|
565 | |
---|
566 | if ( _Thread_queue_Is_reverse_search( priority ) ) |
---|
567 | goto restart_reverse_search; |
---|
568 | |
---|
569 | restart_forward_search: |
---|
570 | search_priority = RTEMS_MINIMUM_PRIORITY - 1; |
---|
571 | _ISR_Disable( level ); |
---|
572 | search_thread = (Thread_Control *) header->first; |
---|
573 | while ( !_Chain_Is_tail( header, (Chain_Node *)search_thread ) ) { |
---|
574 | search_priority = search_thread->current_priority; |
---|
575 | if ( priority <= search_priority ) |
---|
576 | break; |
---|
577 | |
---|
578 | #if ( CPU_UNROLL_ENQUEUE_PRIORITY == TRUE ) |
---|
579 | search_thread = (Thread_Control *) search_thread->Object.Node.next; |
---|
580 | if ( _Chain_Is_tail( header, (Chain_Node *)search_thread ) ) |
---|
581 | break; |
---|
582 | search_priority = search_thread->current_priority; |
---|
583 | if ( priority <= search_priority ) |
---|
584 | break; |
---|
585 | #endif |
---|
586 | _ISR_Flash( level ); |
---|
587 | if ( !_States_Are_set( search_thread->current_state, block_state) ) { |
---|
588 | _ISR_Enable( level ); |
---|
589 | goto restart_forward_search; |
---|
590 | } |
---|
591 | search_thread = |
---|
592 | (Thread_Control *)search_thread->Object.Node.next; |
---|
593 | } |
---|
594 | if ( the_thread_queue->sync == FALSE ) |
---|
595 | goto syncronize; |
---|
596 | |
---|
597 | the_thread_queue->sync = FALSE; |
---|
598 | if ( timeout != RTEMS_NO_TIMEOUT ) |
---|
599 | _Watchdog_Activate( &the_thread->Timer ); |
---|
600 | |
---|
601 | if ( priority == search_priority ) |
---|
602 | goto equal_priority; |
---|
603 | |
---|
604 | search_node = (Chain_Node *) search_thread; |
---|
605 | previous_node = search_node->previous; |
---|
606 | the_node = (Chain_Node *) the_thread; |
---|
607 | |
---|
608 | the_node->next = search_node; |
---|
609 | the_node->previous = previous_node; |
---|
610 | previous_node->next = the_node; |
---|
611 | search_node->previous = the_node; |
---|
612 | _ISR_Enable( level ); |
---|
613 | return; |
---|
614 | |
---|
615 | restart_reverse_search: |
---|
616 | search_priority = RTEMS_MAXIMUM_PRIORITY + 1; |
---|
617 | |
---|
618 | _ISR_Disable( level ); |
---|
619 | search_thread = (Thread_Control *) header->last; |
---|
620 | while ( !_Chain_Is_head( header, (Chain_Node *)search_thread ) ) { |
---|
621 | search_priority = search_thread->current_priority; |
---|
622 | if ( priority >= search_priority ) |
---|
623 | break; |
---|
624 | #if ( CPU_UNROLL_ENQUEUE_PRIORITY == TRUE ) |
---|
625 | search_thread = (Thread_Control *) search_thread->Object.Node.previous; |
---|
626 | if ( _Chain_Is_head( header, (Chain_Node *)search_thread ) ) |
---|
627 | break; |
---|
628 | search_priority = search_thread->current_priority; |
---|
629 | if ( priority >= search_priority ) |
---|
630 | break; |
---|
631 | #endif |
---|
632 | _ISR_Flash( level ); |
---|
633 | if ( !_States_Are_set( search_thread->current_state, block_state) ) { |
---|
634 | _ISR_Enable( level ); |
---|
635 | goto restart_reverse_search; |
---|
636 | } |
---|
637 | search_thread = (Thread_Control *) |
---|
638 | search_thread->Object.Node.previous; |
---|
639 | } |
---|
640 | if ( !the_thread_queue->sync ) |
---|
641 | goto syncronize; |
---|
642 | |
---|
643 | the_thread_queue->sync = FALSE; |
---|
644 | if ( timeout != RTEMS_NO_TIMEOUT ) |
---|
645 | _Watchdog_Activate( &the_thread->Timer ); |
---|
646 | |
---|
647 | if ( priority == search_priority ) |
---|
648 | goto equal_priority; |
---|
649 | |
---|
650 | search_node = (Chain_Node *) search_thread; |
---|
651 | next_node = search_node->next; |
---|
652 | the_node = (Chain_Node *) the_thread; |
---|
653 | |
---|
654 | the_node->next = next_node; |
---|
655 | the_node->previous = search_node; |
---|
656 | search_node->next = the_node; |
---|
657 | next_node->previous = the_node; |
---|
658 | _ISR_Enable( level ); |
---|
659 | return; |
---|
660 | |
---|
661 | equal_priority: /* add at end of priority group */ |
---|
662 | search_node = _Chain_Tail( &search_thread->Wait.Block2n ); |
---|
663 | previous_node = search_node->previous; |
---|
664 | the_node = (Chain_Node *) the_thread; |
---|
665 | |
---|
666 | the_node->next = search_node; |
---|
667 | the_node->previous = previous_node; |
---|
668 | previous_node->next = the_node; |
---|
669 | search_node->previous = the_node; |
---|
670 | _ISR_Enable( level ); |
---|
671 | return; |
---|
672 | |
---|
673 | syncronize: |
---|
674 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
675 | _ISR_Enable( level ); |
---|
676 | _Thread_Unblock( the_thread ); |
---|
677 | } else { |
---|
678 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
679 | _ISR_Enable( level ); |
---|
680 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
681 | _Thread_Unblock( the_thread ); |
---|
682 | } |
---|
683 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
684 | _Thread_MP_Free_proxy( the_thread ); |
---|
685 | } |
---|
686 | |
---|
687 | /*PAGE |
---|
688 | * |
---|
689 | * _Thread_queue_Dequeue_priority |
---|
690 | * |
---|
691 | * This routine removes a thread from the specified RTEMS_PRIORITY based |
---|
692 | * threadq, unblocks it, and cancels its timeout timer. |
---|
693 | * |
---|
694 | * Input parameters: |
---|
695 | * the_thread_queue - pointer to thread queue |
---|
696 | * |
---|
697 | * Output parameters: |
---|
698 | * returns - thread dequeued or NULL |
---|
699 | * |
---|
700 | * INTERRUPT LATENCY: |
---|
701 | * only case |
---|
702 | */ |
---|
703 | |
---|
704 | Thread_Control *_Thread_queue_Dequeue_priority( |
---|
705 | Thread_queue_Control *the_thread_queue |
---|
706 | ) |
---|
707 | { |
---|
708 | unsigned32 index; |
---|
709 | ISR_Level level; |
---|
710 | Thread_Control *the_thread; |
---|
711 | Thread_Control *new_first_thread; |
---|
712 | Chain_Node *new_first_node; |
---|
713 | Chain_Node *new_second_node; |
---|
714 | Chain_Node *last_node; |
---|
715 | Chain_Node *next_node; |
---|
716 | Chain_Node *previous_node; |
---|
717 | |
---|
718 | for( index=0 ; |
---|
719 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
720 | index++ ) { |
---|
721 | _ISR_Disable( level ); |
---|
722 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) ) { |
---|
723 | the_thread = (Thread_Control *) |
---|
724 | the_thread_queue->Queues.Priority[ index ].first; |
---|
725 | goto dequeue; |
---|
726 | } |
---|
727 | _ISR_Enable( level ); |
---|
728 | } |
---|
729 | return NULL; |
---|
730 | |
---|
731 | dequeue: |
---|
732 | new_first_node = the_thread->Wait.Block2n.first; |
---|
733 | new_first_thread = (Thread_Control *) new_first_node; |
---|
734 | next_node = the_thread->Object.Node.next; |
---|
735 | previous_node = the_thread->Object.Node.previous; |
---|
736 | |
---|
737 | if ( !_Chain_Is_empty( &the_thread->Wait.Block2n ) ) { |
---|
738 | last_node = the_thread->Wait.Block2n.last; |
---|
739 | new_second_node = new_first_node->next; |
---|
740 | |
---|
741 | previous_node->next = new_first_node; |
---|
742 | next_node->previous = new_first_node; |
---|
743 | new_first_node->next = next_node; |
---|
744 | new_first_node->previous = previous_node; |
---|
745 | |
---|
746 | if ( !_Chain_Has_only_one_node( &the_thread->Wait.Block2n ) ) { |
---|
747 | /* > two threads on 2-n */ |
---|
748 | new_second_node->previous = |
---|
749 | _Chain_Head( &new_first_thread->Wait.Block2n ); |
---|
750 | |
---|
751 | new_first_thread->Wait.Block2n.first = new_second_node; |
---|
752 | new_first_thread->Wait.Block2n.last = last_node; |
---|
753 | |
---|
754 | last_node->next = _Chain_Tail( &new_first_thread->Wait.Block2n ); |
---|
755 | } |
---|
756 | } else { |
---|
757 | previous_node->next = next_node; |
---|
758 | next_node->previous = previous_node; |
---|
759 | } |
---|
760 | |
---|
761 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
762 | _ISR_Enable( level ); |
---|
763 | _Thread_Unblock( the_thread ); |
---|
764 | } else { |
---|
765 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
766 | _ISR_Enable( level ); |
---|
767 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
768 | _Thread_Unblock( the_thread ); |
---|
769 | } |
---|
770 | |
---|
771 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
772 | _Thread_MP_Free_proxy( the_thread ); |
---|
773 | return( the_thread ); |
---|
774 | } |
---|
775 | |
---|
776 | /*PAGE |
---|
777 | * |
---|
778 | * _Thread_queue_Extract_priority |
---|
779 | * |
---|
780 | * This routine removes a specific thread from the specified threadq, |
---|
781 | * deletes any timeout, and unblocks the thread. |
---|
782 | * |
---|
783 | * Input parameters: |
---|
784 | * the_thread_queue - pointer to a threadq header |
---|
785 | * the_thread - pointer to a thread control block |
---|
786 | * |
---|
787 | * Output parameters: NONE |
---|
788 | * |
---|
789 | * INTERRUPT LATENCY: |
---|
790 | * EXTRACT_PRIORITY |
---|
791 | */ |
---|
792 | |
---|
793 | void _Thread_queue_Extract_priority( |
---|
794 | Thread_queue_Control *the_thread_queue, |
---|
795 | Thread_Control *the_thread |
---|
796 | ) |
---|
797 | { |
---|
798 | ISR_Level level; |
---|
799 | Chain_Node *the_node; |
---|
800 | Chain_Node *next_node; |
---|
801 | Chain_Node *previous_node; |
---|
802 | Thread_Control *new_first_thread; |
---|
803 | Chain_Node *new_first_node; |
---|
804 | Chain_Node *new_second_node; |
---|
805 | Chain_Node *last_node; |
---|
806 | |
---|
807 | the_node = (Chain_Node *) the_thread; |
---|
808 | _ISR_Disable( level ); |
---|
809 | if ( _States_Is_waiting_on_thread_queue( the_thread->current_state ) ) { |
---|
810 | next_node = the_node->next; |
---|
811 | previous_node = the_node->previous; |
---|
812 | |
---|
813 | if ( !_Chain_Is_empty( &the_thread->Wait.Block2n ) ) { |
---|
814 | new_first_node = the_thread->Wait.Block2n.first; |
---|
815 | new_first_thread = (Thread_Control *) new_first_node; |
---|
816 | last_node = the_thread->Wait.Block2n.last; |
---|
817 | new_second_node = new_first_node->next; |
---|
818 | |
---|
819 | previous_node->next = new_first_node; |
---|
820 | next_node->previous = new_first_node; |
---|
821 | new_first_node->next = next_node; |
---|
822 | new_first_node->previous = previous_node; |
---|
823 | |
---|
824 | if ( !_Chain_Has_only_one_node( &the_thread->Wait.Block2n ) ) { |
---|
825 | /* > two threads on 2-n */ |
---|
826 | new_second_node->previous = |
---|
827 | _Chain_Head( &new_first_thread->Wait.Block2n ); |
---|
828 | new_first_thread->Wait.Block2n.first = new_second_node; |
---|
829 | |
---|
830 | new_first_thread->Wait.Block2n.last = last_node; |
---|
831 | last_node->next = _Chain_Tail( &new_first_thread->Wait.Block2n ); |
---|
832 | } |
---|
833 | } else { |
---|
834 | previous_node->next = next_node; |
---|
835 | next_node->previous = previous_node; |
---|
836 | } |
---|
837 | |
---|
838 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
839 | _ISR_Enable( level ); |
---|
840 | _Thread_Unblock( the_thread ); |
---|
841 | } else { |
---|
842 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
843 | _ISR_Enable( level ); |
---|
844 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
845 | _Thread_Unblock( the_thread ); |
---|
846 | } |
---|
847 | |
---|
848 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
849 | _Thread_MP_Free_proxy( the_thread ); |
---|
850 | } |
---|
851 | else |
---|
852 | _ISR_Enable( level ); |
---|
853 | } |
---|
854 | |
---|
855 | /*PAGE |
---|
856 | * |
---|
857 | * _Thread_queue_First_priority |
---|
858 | * |
---|
859 | * This routines returns a pointer to the first thread on the |
---|
860 | * specified threadq. |
---|
861 | * |
---|
862 | * Input parameters: |
---|
863 | * the_thread_queue - pointer to thread queue |
---|
864 | * |
---|
865 | * Output parameters: |
---|
866 | * returns - first thread or NULL |
---|
867 | */ |
---|
868 | |
---|
869 | Thread_Control *_Thread_queue_First_priority ( |
---|
870 | Thread_queue_Control *the_thread_queue |
---|
871 | ) |
---|
872 | { |
---|
873 | unsigned32 index; |
---|
874 | |
---|
875 | for( index=0 ; |
---|
876 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
877 | index++ ) { |
---|
878 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) ) |
---|
879 | return (Thread_Control *) |
---|
880 | the_thread_queue->Queues.Priority[ index ].first; |
---|
881 | } |
---|
882 | return NULL; |
---|
883 | } |
---|