1 /* Copyright (c) 2004-2011. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "xbt/sysdep.h"
10 #include "xbt/mallocator.h"
11 #include "maxmin_private.h"
13 #include <stdio.h> /* sprintf */
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
16 "Logging specific to SURF (maxmin)");
18 typedef struct s_dyn_light {
22 } s_dyn_light_t, *dyn_light_t;
24 double sg_maxmin_precision = 0.00001;
26 static void *lmm_variable_mallocator_new_f(void);
27 static void lmm_variable_mallocator_free_f(void *var);
28 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)NULL)
29 static void lmm_update_modified_set(lmm_system_t sys,
30 lmm_constraint_t cnst);
31 static void lmm_remove_all_modified_set(lmm_system_t sys);
32 static int Global_debug_id = 1;
33 static int Global_const_debug_id = 1;
35 lmm_system_t lmm_system_new(int selective_update)
37 lmm_system_t l = NULL;
39 s_lmm_constraint_t cnst;
41 l = xbt_new0(s_lmm_system_t, 1);
44 l->selective_update_active = selective_update;
45 l->visited_counter = 1;
47 XBT_DEBUG("Setting selective_update_active flag to %d\n",
48 l->selective_update_active);
50 xbt_swag_init(&(l->variable_set),
51 xbt_swag_offset(var, variable_set_hookup));
52 xbt_swag_init(&(l->constraint_set),
53 xbt_swag_offset(cnst, constraint_set_hookup));
55 xbt_swag_init(&(l->active_constraint_set),
56 xbt_swag_offset(cnst, active_constraint_set_hookup));
58 xbt_swag_init(&(l->modified_constraint_set),
59 xbt_swag_offset(cnst, modified_constraint_set_hookup));
60 xbt_swag_init(&(l->saturated_variable_set),
61 xbt_swag_offset(var, saturated_variable_set_hookup));
62 xbt_swag_init(&(l->saturated_constraint_set),
63 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
65 l->variable_mallocator = xbt_mallocator_new(65536,
66 lmm_variable_mallocator_new_f,
67 lmm_variable_mallocator_free_f,
68 lmm_variable_mallocator_reset_f);
73 void lmm_system_free(lmm_system_t sys)
75 lmm_variable_t var = NULL;
76 lmm_constraint_t cnst = NULL;
78 while ((var = extract_variable(sys))) {
80 ("Variable %p (%d) still in LMM system when freing it: this may be a bug",
82 lmm_var_free(sys, var);
85 while ((cnst = extract_constraint(sys)))
86 lmm_cnst_free(sys, cnst);
88 xbt_mallocator_free(sys->variable_mallocator);
92 XBT_INLINE void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
97 lmm_element_t elem = NULL;
99 XBT_IN("(sys=%p, var=%p)", sys, var);
103 for (i = 0; i < var->cnsts_number; i++) {
104 elem = &var->cnsts[i];
105 xbt_swag_remove(elem, &(elem->constraint->element_set));
106 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
107 if (!xbt_swag_size(&(elem->constraint->element_set)))
108 make_constraint_inactive(sys, elem->constraint);
111 var->cnsts[n].constraint = elem->constraint;
116 var->cnsts_number = n;
117 lmm_update_modified_set(sys, var->cnsts[0].constraint);
120 var->cnsts_number = 0;
124 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
127 lmm_variable_disable(sys, var);
128 xbt_mallocator_release(sys->variable_mallocator, var);
131 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
132 lmm_constraint_t cnst)
134 /* xbt_assert(xbt_swag_size(&(cnst->element_set)), */
135 /* "This list should be empty!"); */
136 make_constraint_inactive(sys, cnst);
140 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
143 lmm_constraint_t cnst = NULL;
144 s_lmm_element_t elem;
146 cnst = xbt_new0(s_lmm_constraint_t, 1);
148 cnst->id_int = Global_const_debug_id++;
149 xbt_swag_init(&(cnst->element_set),
150 xbt_swag_offset(elem, element_set_hookup));
151 xbt_swag_init(&(cnst->active_element_set),
152 xbt_swag_offset(elem, active_element_set_hookup));
154 cnst->bound = bound_value;
157 insert_constraint(sys, cnst);
162 XBT_INLINE void lmm_constraint_shared(lmm_constraint_t cnst)
167 XBT_INLINE int lmm_constraint_is_shared(lmm_constraint_t cnst)
169 return (cnst->shared);
172 XBT_INLINE void lmm_constraint_free(lmm_system_t sys,
173 lmm_constraint_t cnst)
175 remove_constraint(sys, cnst);
176 lmm_cnst_free(sys, cnst);
179 static void *lmm_variable_mallocator_new_f(void)
181 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
182 var->cnsts = NULL; /* will be created by realloc */
186 static void lmm_variable_mallocator_free_f(void *var)
188 xbt_free(((lmm_variable_t) var)->cnsts);
192 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
194 double bound, int number_of_constraints)
196 lmm_variable_t var = NULL;
199 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
200 sys, id, weight, bound, number_of_constraints);
202 var = xbt_mallocator_get(sys->variable_mallocator);
204 var->id_int = Global_debug_id++;
205 var->cnsts = xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
206 for (i = 0; i < number_of_constraints; i++) {
207 var->cnsts[i].element_set_hookup.next = NULL;
208 var->cnsts[i].element_set_hookup.prev = NULL;
209 var->cnsts[i].active_element_set_hookup.next = NULL;
210 var->cnsts[i].active_element_set_hookup.prev = NULL;
211 var->cnsts[i].constraint = NULL;
212 var->cnsts[i].variable = NULL;
213 var->cnsts[i].value = 0.0;
215 var->cnsts_size = number_of_constraints;
216 var->cnsts_number = 0;
217 var->weight = weight;
220 var->visited = sys->visited_counter - 1;
223 var->func_f = func_f_def;
224 var->func_fp = func_fp_def;
225 var->func_fpi = func_fpi_def;
227 var->variable_set_hookup.next = NULL;
228 var->variable_set_hookup.prev = NULL;
229 var->saturated_variable_set_hookup.next = NULL;
230 var->saturated_variable_set_hookup.prev = NULL;
233 xbt_swag_insert_at_head(var, &(sys->variable_set));
235 xbt_swag_insert_at_tail(var, &(sys->variable_set));
237 XBT_OUT(" returns %p", var);
241 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
243 remove_variable(sys, var);
244 lmm_var_free(sys, var);
247 XBT_INLINE double lmm_variable_getvalue(lmm_variable_t var)
252 XBT_INLINE double lmm_variable_getbound(lmm_variable_t var)
257 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
258 lmm_variable_t var, double value)
260 lmm_element_t elem = NULL;
264 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
266 elem = &(var->cnsts[var->cnsts_number++]);
269 elem->constraint = cnst;
270 elem->variable = var;
273 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
275 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
276 if(!sys->selective_update_active) {
277 make_constraint_active(sys, cnst);
278 } else if(elem->value>0 || var->weight >0) {
279 make_constraint_active(sys, cnst);
280 lmm_update_modified_set(sys, cnst);
281 if (var->cnsts_number > 1)
282 lmm_update_modified_set(sys, var->cnsts[0].constraint);
286 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
287 lmm_variable_t var, double value)
292 for (i = 0; i < var->cnsts_number; i++)
293 if (var->cnsts[i].constraint == cnst)
296 if (i < var->cnsts_number) {
298 var->cnsts[i].value += value;
300 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
301 lmm_update_modified_set(sys, cnst);
303 lmm_expand(sys, cnst, var, value);
306 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
307 lmm_variable_t var, double value)
311 for (i = 0; i < var->cnsts_number; i++)
312 if (var->cnsts[i].constraint == cnst)
315 if (i < var->cnsts_number) {
316 var->cnsts[i].value = value;
318 lmm_update_modified_set(sys, cnst);
323 XBT_INLINE lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
327 if (num < var->cnsts_number)
328 return (var->cnsts[num].constraint);
333 XBT_INLINE double lmm_get_cnst_weight_from_var(lmm_system_t sys,
337 if (num < var->cnsts_number)
338 return (var->cnsts[num].value);
343 XBT_INLINE int lmm_get_number_of_cnst_from_var(lmm_system_t sys,
346 return (var->cnsts_number);
349 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
350 lmm_constraint_t cnst,
351 lmm_element_t * elem)
354 *elem = xbt_swag_getFirst(&(cnst->element_set));
356 *elem = xbt_swag_getNext(*elem, cnst->element_set.offset);
358 return (*elem)->variable;
363 XBT_INLINE void *lmm_constraint_id(lmm_constraint_t cnst)
368 XBT_INLINE void *lmm_variable_id(lmm_variable_t var)
373 static XBT_INLINE void saturated_constraint_set_update(double usage,
375 dyn_light_t saturated_constraint_set,
378 xbt_assert(usage > 0,"Impossible");
380 if (*min_usage < 0 || *min_usage > usage) {
382 // XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
383 saturated_constraint_set->data[0] = cnst_light_num;
384 saturated_constraint_set->pos = 1;
385 } else if (*min_usage == usage) {
386 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
387 saturated_constraint_set->size *= 2;
388 saturated_constraint_set->data = realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
390 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
391 saturated_constraint_set->pos++;
395 static XBT_INLINE void saturated_variable_set_update(
396 s_lmm_constraint_light_t *cnst_light_tab,
397 dyn_light_t saturated_constraint_set,
400 lmm_constraint_light_t cnst = NULL;
401 lmm_element_t elem = NULL;
402 xbt_swag_t elem_list = NULL;
404 for(i = 0; i< saturated_constraint_set->pos; i++){
405 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
406 elem_list = &(cnst->cnst->active_element_set);
407 xbt_swag_foreach(elem, elem_list) {
408 if (elem->variable->weight <= 0)
410 if ((elem->value > 0))
411 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
416 void lmm_print(lmm_system_t sys)
418 lmm_constraint_t cnst = NULL;
419 lmm_element_t elem = NULL;
420 lmm_variable_t var = NULL;
421 xbt_swag_t cnst_list = NULL;
422 xbt_swag_t var_list = NULL;
423 xbt_swag_t elem_list = NULL;
424 char print_buf[1024];
425 char *trace_buf = xbt_malloc0(sizeof(char));
428 /* Printing Objective */
429 var_list = &(sys->variable_set);
430 sprintf(print_buf, "MAX-MIN ( ");
432 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
433 strcat(trace_buf, print_buf);
434 xbt_swag_foreach(var, var_list) {
435 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
437 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
438 strcat(trace_buf, print_buf);
440 sprintf(print_buf, ")");
442 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
443 strcat(trace_buf, print_buf);
444 XBT_DEBUG("%20s", trace_buf);
445 trace_buf[0] = '\000';
447 XBT_DEBUG("Constraints");
448 /* Printing Constraints */
449 cnst_list = &(sys->active_constraint_set);
450 xbt_swag_foreach(cnst, cnst_list) {
452 elem_list = &(cnst->element_set);
453 sprintf(print_buf, "\t");
455 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
456 strcat(trace_buf, print_buf);
457 sprintf(print_buf, "%s(",(cnst->shared)?"":"max");
459 xbt_realloc(trace_buf,
460 strlen(trace_buf) + strlen(print_buf) + 1);
461 strcat(trace_buf, print_buf);
462 xbt_swag_foreach(elem, elem_list) {
463 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
464 elem->variable->id_int, elem->variable->value,(cnst->shared)?"+":",");
466 xbt_realloc(trace_buf,
467 strlen(trace_buf) + strlen(print_buf) + 1);
468 strcat(trace_buf, print_buf);
470 sum += elem->value * elem->variable->value;
472 sum = MAX(sum,elem->value * elem->variable->value);
474 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
476 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
477 strcat(trace_buf, print_buf);
480 sprintf(print_buf, " [MAX-Constraint]");
482 xbt_realloc(trace_buf,
483 strlen(trace_buf) + strlen(print_buf) + 1);
484 strcat(trace_buf, print_buf);
486 XBT_DEBUG("%s", trace_buf);
487 trace_buf[0] = '\000';
488 xbt_assert(!double_positive(sum - cnst->bound),
489 "Incorrect value (%f is not smaller than %f): %g",
490 sum, cnst->bound, sum - cnst->bound);
493 XBT_DEBUG("Variables");
494 /* Printing Result */
495 xbt_swag_foreach(var, var_list) {
496 if (var->bound > 0) {
497 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
499 xbt_assert(!double_positive(var->value - var->bound),
500 "Incorrect value (%f is not smaller than %f",
501 var->value, var->bound);
503 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
510 void lmm_solve(lmm_system_t sys)
512 lmm_variable_t var = NULL;
513 lmm_constraint_t cnst = NULL;
514 lmm_constraint_t cnst_next = NULL;
515 lmm_element_t elem = NULL;
516 xbt_swag_t cnst_list = NULL;
517 xbt_swag_t var_list = NULL;
518 xbt_swag_t elem_list = NULL;
519 double min_usage = -1;
520 double min_bound = -1;
522 if (!(sys->modified))
525 XBT_IN("(sys=%p)", sys);
528 * Compute Usage and store the variables that reach the maximum.
532 selective_update_active ? &(sys->modified_constraint_set) :
533 &(sys->active_constraint_set);
535 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
536 /* Init: Only modified code portions */
537 xbt_swag_foreach(cnst, cnst_list) {
538 elem_list = &(cnst->element_set);
539 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
540 xbt_swag_foreach(elem, elem_list) {
541 var = elem->variable;
542 if (var->weight <= 0.0)
548 s_lmm_constraint_light_t *cnst_light_tab = (s_lmm_constraint_light_t *)xbt_malloc0(xbt_swag_size(cnst_list)*sizeof(s_lmm_constraint_light_t));
549 int cnst_light_num = 0;
550 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
551 saturated_constraint_set->size = 5;
552 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
554 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
556 cnst->remaining = cnst->bound;
557 if (cnst->remaining == 0)
560 elem_list = &(cnst->element_set);
561 xbt_swag_foreach(elem, elem_list) {
562 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
563 if (elem->variable->weight <= 0)
565 if ((elem->value > 0)) {
567 cnst->usage += elem->value / elem->variable->weight;
568 else if (cnst->usage < elem->value / elem->variable->weight)
569 cnst->usage = elem->value / elem->variable->weight;
571 make_elem_active(elem);
573 xbt_swag_insert(elem->variable->id, sys->keep_track);
576 XBT_DEBUG("Constraint Usage '%d' : %f", cnst->id_int, cnst->usage);
577 /* Saturated constraints update */
579 if(cnst->usage > 0) {
580 cnst_light_tab[cnst_light_num].cnst = cnst;
581 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
582 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
583 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
584 cnst_light_num, saturated_constraint_set, &min_usage);
589 saturated_variable_set_update( cnst_light_tab,
590 saturated_constraint_set,
593 /* Saturated variables update */
596 /* Fix the variables that have to be */
597 var_list = &(sys->saturated_variable_set);
599 xbt_swag_foreach(var, var_list) {
600 if (var->weight <= 0.0)
602 /* First check if some of these variables have reach their upper
603 bound and update min_usage accordingly. */
605 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
606 var->id_int, var->bound, var->weight, min_usage,
607 var->bound * var->weight);
608 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
610 min_bound = var->bound;
612 min_bound = MIN(min_bound, var->bound);
613 XBT_DEBUG("Updated min_bound=%f", min_bound);
618 while ((var = xbt_swag_getFirst(var_list))) {
622 var->value = min_usage / var->weight;
624 if (min_bound == var->bound)
625 var->value = var->bound;
627 xbt_swag_remove(var, var_list);
631 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
632 min_usage, var->id_int, var->weight, var->id_int, var->value);
637 for (i = 0; i < var->cnsts_number; i++) {
638 elem = &var->cnsts[i];
639 cnst = elem->constraint;
641 double_update(&(cnst->remaining), elem->value * var->value);
642 double_update(&(cnst->usage), elem->value / var->weight);
643 if(cnst->usage<=0 || cnst->remaining<=0) {
644 if (cnst->cnst_light) {
645 int index = (cnst->cnst_light-cnst_light_tab);
646 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
647 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
648 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
649 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
651 cnst->cnst_light = NULL;
654 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
656 make_elem_inactive(elem);
659 make_elem_inactive(elem);
660 elem_list = &(cnst->element_set);
661 xbt_swag_foreach(elem, elem_list) {
662 if (elem->variable->weight <= 0 || elem->variable->value > 0)
665 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
667 if (cnst->usage<=0 || cnst->remaining<=0) {
668 if(cnst->cnst_light) {
669 int index = (cnst->cnst_light-cnst_light_tab);
670 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
671 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
672 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
673 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
675 cnst->cnst_light = NULL;
678 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
682 xbt_swag_remove(var, var_list);
685 /* Find out which variables reach the maximum */
688 saturated_constraint_set->pos = 0;
690 for(pos=0; pos<cnst_light_num; pos++)
691 saturated_constraint_set_update(
692 cnst_light_tab[pos].remaining_over_usage,
694 saturated_constraint_set,
697 saturated_variable_set_update( cnst_light_tab,
698 saturated_constraint_set,
701 } while (cnst_light_num > 0);
704 if (sys->selective_update_active)
705 lmm_remove_all_modified_set(sys);
707 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
711 xbt_free(saturated_constraint_set->data);
712 xbt_free(saturated_constraint_set);
713 xbt_free(cnst_light_tab);
717 /* Not a O(1) function */
719 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
720 lmm_variable_t var, double value)
724 for (i = 0; i < var->cnsts_number; i++)
725 if (var->cnsts[i].constraint == cnst) {
726 var->cnsts[i].value = value;
728 lmm_update_modified_set(sys, cnst);
733 /** \brief Attribute the value bound to var->bound.
735 * \param sys the lmm_system_t
736 * \param var the lmm_variable_t
737 * \param bound the new bound to associate with var
739 * Makes var->bound equal to bound. Whenever this function is called
740 * a change is signed in the system. To
741 * avoid false system changing detection it is a good idea to test
742 * (bound != 0) before calling it.
745 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
751 if (var->cnsts_number)
752 lmm_update_modified_set(sys, var->cnsts[0].constraint);
756 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
762 if (weight == var->weight)
764 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
766 var->weight = weight;
767 xbt_swag_remove(var, &(sys->variable_set));
769 xbt_swag_insert_at_head(var, &(sys->variable_set));
771 xbt_swag_insert_at_tail(var, &(sys->variable_set));
773 for (i = 0; i < var->cnsts_number; i++) {
774 elem = &var->cnsts[i];
775 xbt_swag_remove(elem, &(elem->constraint->element_set));
777 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
779 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
782 lmm_update_modified_set(sys, elem->constraint);
790 XBT_INLINE double lmm_get_variable_weight(lmm_variable_t var)
795 XBT_INLINE void lmm_update_constraint_bound(lmm_system_t sys,
796 lmm_constraint_t cnst,
800 lmm_update_modified_set(sys, cnst);
804 XBT_INLINE int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
806 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
809 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
812 return xbt_swag_getFirst(&(sys->active_constraint_set));
815 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
820 return xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
823 #ifdef HAVE_LATENCY_BOUND_TRACKING
824 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
826 return (double_equals(var->bound, var->value));
831 /** \brief Update the constraint set propagating recursively to
832 * other constraints so the system should not be entirely computed.
834 * \param sys the lmm_system_t
835 * \param cnst the lmm_constraint_t affected by the change
837 * A recursive algorithm to optimize the system recalculation selecting only
838 * constraints that have changed. Each constraint change is propagated
839 * to the list of constraints for each variable.
841 static void lmm_update_modified_set_rec(lmm_system_t sys,
842 lmm_constraint_t cnst)
846 xbt_swag_foreach(elem, &cnst->element_set) {
847 lmm_variable_t var = elem->variable;
848 s_lmm_element_t *cnsts = var->cnsts;
850 for (i = 0; var->visited != sys->visited_counter
851 && i < var->cnsts_number ; i++) {
852 if (cnsts[i].constraint != cnst
853 && !xbt_swag_belongs(cnsts[i].constraint,
854 &sys->modified_constraint_set)) {
855 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
856 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
859 var->visited = sys->visited_counter;
863 static void lmm_update_modified_set(lmm_system_t sys,
864 lmm_constraint_t cnst)
866 /* nothing to do if selective update isn't active */
867 if (sys->selective_update_active
868 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
869 xbt_swag_insert(cnst, &sys->modified_constraint_set);
870 lmm_update_modified_set_rec(sys, cnst);
874 /** \brief Remove all constraints of the modified_constraint_set.
876 * \param sys the lmm_system_t
878 static void lmm_remove_all_modified_set(lmm_system_t sys)
880 if (++sys->visited_counter == 1) {
881 /* the counter wrapped around, reset each variable->visited */
883 xbt_swag_foreach(var, &sys->variable_set)
886 xbt_swag_reset(&sys->modified_constraint_set);