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 XBT_EXPORT_NO_IMPORT(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 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
36 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
37 lmm_constraint_t cnst);
39 lmm_system_t lmm_system_new(int selective_update)
41 lmm_system_t l = NULL;
43 s_lmm_constraint_t cnst;
45 l = xbt_new0(s_lmm_system_t, 1);
48 l->selective_update_active = selective_update;
49 l->visited_counter = 1;
51 XBT_DEBUG("Setting selective_update_active flag to %d\n",
52 l->selective_update_active);
54 xbt_swag_init(&(l->variable_set),
55 xbt_swag_offset(var, variable_set_hookup));
56 xbt_swag_init(&(l->constraint_set),
57 xbt_swag_offset(cnst, constraint_set_hookup));
59 xbt_swag_init(&(l->active_constraint_set),
60 xbt_swag_offset(cnst, active_constraint_set_hookup));
62 xbt_swag_init(&(l->modified_constraint_set),
63 xbt_swag_offset(cnst, modified_constraint_set_hookup));
64 xbt_swag_init(&(l->saturated_variable_set),
65 xbt_swag_offset(var, saturated_variable_set_hookup));
66 xbt_swag_init(&(l->saturated_constraint_set),
67 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
69 l->variable_mallocator = xbt_mallocator_new(65536,
70 lmm_variable_mallocator_new_f,
71 lmm_variable_mallocator_free_f,
72 lmm_variable_mallocator_reset_f);
77 void lmm_system_free(lmm_system_t sys)
79 lmm_variable_t var = NULL;
80 lmm_constraint_t cnst = NULL;
82 while ((var = extract_variable(sys))) {
84 ("Variable %p (%d) still in LMM system when freing it: this may be a bug",
86 lmm_var_free(sys, var);
89 while ((cnst = extract_constraint(sys)))
90 lmm_cnst_free(sys, cnst);
92 xbt_mallocator_free(sys->variable_mallocator);
96 XBT_INLINE void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
101 lmm_element_t elem = NULL;
103 XBT_IN("(sys=%p, var=%p)", sys, var);
107 for (i = 0; i < var->cnsts_number; i++) {
108 elem = &var->cnsts[i];
109 xbt_swag_remove(elem, &(elem->constraint->element_set));
110 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
111 if (!xbt_swag_size(&(elem->constraint->element_set)))
112 make_constraint_inactive(sys, elem->constraint);
115 var->cnsts[n].constraint = elem->constraint;
120 var->cnsts_number = n;
121 lmm_update_modified_set(sys, var->cnsts[0].constraint);
124 var->cnsts_number = 0;
128 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
131 lmm_variable_disable(sys, var);
132 xbt_mallocator_release(sys->variable_mallocator, var);
135 static XBT_INLINE void lmm_cnst_free(lmm_system_t sys,
136 lmm_constraint_t cnst)
138 /* xbt_assert(xbt_swag_size(&(cnst->element_set)), */
139 /* "This list should be empty!"); */
140 make_constraint_inactive(sys, cnst);
144 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
147 lmm_constraint_t cnst = NULL;
148 s_lmm_element_t elem;
150 cnst = xbt_new0(s_lmm_constraint_t, 1);
152 cnst->id_int = Global_const_debug_id++;
153 xbt_swag_init(&(cnst->element_set),
154 xbt_swag_offset(elem, element_set_hookup));
155 xbt_swag_init(&(cnst->active_element_set),
156 xbt_swag_offset(elem, active_element_set_hookup));
158 cnst->bound = bound_value;
161 insert_constraint(sys, cnst);
166 XBT_INLINE void lmm_constraint_shared(lmm_constraint_t cnst)
171 XBT_INLINE int lmm_constraint_is_shared(lmm_constraint_t cnst)
173 return (cnst->shared);
176 XBT_INLINE void lmm_constraint_free(lmm_system_t sys,
177 lmm_constraint_t cnst)
179 remove_constraint(sys, cnst);
180 lmm_cnst_free(sys, cnst);
183 static void *lmm_variable_mallocator_new_f(void)
185 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
186 var->cnsts = NULL; /* will be created by realloc */
190 static void lmm_variable_mallocator_free_f(void *var)
192 xbt_free(((lmm_variable_t) var)->cnsts);
196 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
198 double bound, int number_of_constraints)
200 lmm_variable_t var = NULL;
203 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
204 sys, id, weight, bound, number_of_constraints);
206 var = xbt_mallocator_get(sys->variable_mallocator);
208 var->id_int = Global_debug_id++;
209 var->cnsts = xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
210 for (i = 0; i < number_of_constraints; i++) {
211 var->cnsts[i].element_set_hookup.next = NULL;
212 var->cnsts[i].element_set_hookup.prev = NULL;
213 var->cnsts[i].active_element_set_hookup.next = NULL;
214 var->cnsts[i].active_element_set_hookup.prev = NULL;
215 var->cnsts[i].constraint = NULL;
216 var->cnsts[i].variable = NULL;
217 var->cnsts[i].value = 0.0;
219 var->cnsts_size = number_of_constraints;
220 var->cnsts_number = 0;
221 var->weight = weight;
224 var->visited = sys->visited_counter - 1;
227 var->func_f = func_f_def;
228 var->func_fp = func_fp_def;
229 var->func_fpi = func_fpi_def;
231 var->variable_set_hookup.next = NULL;
232 var->variable_set_hookup.prev = NULL;
233 var->saturated_variable_set_hookup.next = NULL;
234 var->saturated_variable_set_hookup.prev = NULL;
237 xbt_swag_insert_at_head(var, &(sys->variable_set));
239 xbt_swag_insert_at_tail(var, &(sys->variable_set));
241 XBT_OUT(" returns %p", var);
245 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
247 remove_variable(sys, var);
248 lmm_var_free(sys, var);
251 XBT_INLINE double lmm_variable_getvalue(lmm_variable_t var)
256 XBT_INLINE double lmm_variable_getbound(lmm_variable_t var)
261 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
262 lmm_variable_t var, double value)
264 lmm_element_t elem = NULL;
268 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
270 elem = &(var->cnsts[var->cnsts_number++]);
273 elem->constraint = cnst;
274 elem->variable = var;
277 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
279 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
280 if(!sys->selective_update_active) {
281 make_constraint_active(sys, cnst);
282 } else if(elem->value>0 || var->weight >0) {
283 make_constraint_active(sys, cnst);
284 lmm_update_modified_set(sys, cnst);
285 if (var->cnsts_number > 1)
286 lmm_update_modified_set(sys, var->cnsts[0].constraint);
290 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
291 lmm_variable_t var, double value)
296 for (i = 0; i < var->cnsts_number; i++)
297 if (var->cnsts[i].constraint == cnst)
300 if (i < var->cnsts_number) {
302 var->cnsts[i].value += value;
304 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
305 lmm_update_modified_set(sys, cnst);
307 lmm_expand(sys, cnst, var, value);
310 void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
311 lmm_variable_t var, double value)
315 for (i = 0; i < var->cnsts_number; i++)
316 if (var->cnsts[i].constraint == cnst)
319 if (i < var->cnsts_number) {
320 var->cnsts[i].value = value;
322 lmm_update_modified_set(sys, cnst);
327 XBT_INLINE lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
331 if (num < var->cnsts_number)
332 return (var->cnsts[num].constraint);
337 XBT_INLINE double lmm_get_cnst_weight_from_var(lmm_system_t sys,
341 if (num < var->cnsts_number)
342 return (var->cnsts[num].value);
347 XBT_INLINE int lmm_get_number_of_cnst_from_var(lmm_system_t sys,
350 return (var->cnsts_number);
353 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys,
354 lmm_constraint_t cnst,
355 lmm_element_t * elem)
358 *elem = xbt_swag_getFirst(&(cnst->element_set));
360 *elem = xbt_swag_getNext(*elem, cnst->element_set.offset);
362 return (*elem)->variable;
367 XBT_INLINE void *lmm_constraint_id(lmm_constraint_t cnst)
372 XBT_INLINE void *lmm_variable_id(lmm_variable_t var)
377 static XBT_INLINE void saturated_constraint_set_update(double usage,
379 dyn_light_t saturated_constraint_set,
382 xbt_assert(usage > 0,"Impossible");
384 if (*min_usage < 0 || *min_usage > usage) {
386 // XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
387 saturated_constraint_set->data[0] = cnst_light_num;
388 saturated_constraint_set->pos = 1;
389 } else if (*min_usage == usage) {
390 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
391 saturated_constraint_set->size *= 2;
392 saturated_constraint_set->data = xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
394 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
395 saturated_constraint_set->pos++;
399 static XBT_INLINE void saturated_variable_set_update(
400 s_lmm_constraint_light_t *cnst_light_tab,
401 dyn_light_t saturated_constraint_set,
404 lmm_constraint_light_t cnst = NULL;
405 lmm_element_t elem = NULL;
406 xbt_swag_t elem_list = NULL;
408 for(i = 0; i< saturated_constraint_set->pos; i++){
409 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
410 elem_list = &(cnst->cnst->active_element_set);
411 xbt_swag_foreach(elem, elem_list) {
412 if (elem->variable->weight <= 0)
414 if ((elem->value > 0))
415 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
420 void lmm_print(lmm_system_t sys)
422 lmm_constraint_t cnst = NULL;
423 lmm_element_t elem = NULL;
424 lmm_variable_t var = NULL;
425 xbt_swag_t cnst_list = NULL;
426 xbt_swag_t var_list = NULL;
427 xbt_swag_t elem_list = NULL;
428 char print_buf[1024];
429 char *trace_buf = xbt_malloc0(sizeof(char));
432 /* Printing Objective */
433 var_list = &(sys->variable_set);
434 sprintf(print_buf, "MAX-MIN ( ");
436 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
437 strcat(trace_buf, print_buf);
438 xbt_swag_foreach(var, var_list) {
439 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
441 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
442 strcat(trace_buf, print_buf);
444 sprintf(print_buf, ")");
446 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
447 strcat(trace_buf, print_buf);
448 XBT_DEBUG("%20s", trace_buf);
449 trace_buf[0] = '\000';
451 XBT_DEBUG("Constraints");
452 /* Printing Constraints */
453 cnst_list = &(sys->active_constraint_set);
454 xbt_swag_foreach(cnst, cnst_list) {
456 elem_list = &(cnst->element_set);
457 sprintf(print_buf, "\t");
459 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
460 strcat(trace_buf, print_buf);
461 sprintf(print_buf, "%s(",(cnst->shared)?"":"max");
463 xbt_realloc(trace_buf,
464 strlen(trace_buf) + strlen(print_buf) + 1);
465 strcat(trace_buf, print_buf);
466 xbt_swag_foreach(elem, elem_list) {
467 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
468 elem->variable->id_int, elem->variable->value,(cnst->shared)?"+":",");
470 xbt_realloc(trace_buf,
471 strlen(trace_buf) + strlen(print_buf) + 1);
472 strcat(trace_buf, print_buf);
474 sum += elem->value * elem->variable->value;
476 sum = MAX(sum,elem->value * elem->variable->value);
478 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
480 xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
481 strcat(trace_buf, print_buf);
484 sprintf(print_buf, " [MAX-Constraint]");
486 xbt_realloc(trace_buf,
487 strlen(trace_buf) + strlen(print_buf) + 1);
488 strcat(trace_buf, print_buf);
490 XBT_DEBUG("%s", trace_buf);
491 trace_buf[0] = '\000';
492 xbt_assert(!double_positive(sum - cnst->bound),
493 "Incorrect value (%f is not smaller than %f): %g",
494 sum, cnst->bound, sum - cnst->bound);
497 XBT_DEBUG("Variables");
498 /* Printing Result */
499 xbt_swag_foreach(var, var_list) {
500 if (var->bound > 0) {
501 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value,
503 xbt_assert(!double_positive(var->value - var->bound),
504 "Incorrect value (%f is not smaller than %f",
505 var->value, var->bound);
507 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
514 void lmm_solve(lmm_system_t sys)
516 lmm_variable_t var = NULL;
517 lmm_constraint_t cnst = NULL;
518 lmm_constraint_t cnst_next = NULL;
519 lmm_element_t elem = NULL;
520 xbt_swag_t cnst_list = NULL;
521 xbt_swag_t var_list = NULL;
522 xbt_swag_t elem_list = NULL;
523 double min_usage = -1;
524 double min_bound = -1;
526 if (!(sys->modified))
529 XBT_IN("(sys=%p)", sys);
532 * Compute Usage and store the variables that reach the maximum.
536 selective_update_active ? &(sys->modified_constraint_set) :
537 &(sys->active_constraint_set);
539 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
540 /* Init: Only modified code portions */
541 xbt_swag_foreach(cnst, cnst_list) {
542 elem_list = &(cnst->element_set);
543 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
544 xbt_swag_foreach(elem, elem_list) {
545 var = elem->variable;
546 if (var->weight <= 0.0)
552 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));
553 int cnst_light_num = 0;
554 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
555 saturated_constraint_set->size = 5;
556 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
558 xbt_swag_foreach_safe(cnst, cnst_next, cnst_list) {
560 cnst->remaining = cnst->bound;
561 if (cnst->remaining == 0)
564 elem_list = &(cnst->element_set);
565 xbt_swag_foreach(elem, elem_list) {
566 /* 0-weighted elements (ie, sleep actions) are at the end of the swag and we don't want to consider them */
567 if (elem->variable->weight <= 0)
569 if ((elem->value > 0)) {
571 cnst->usage += elem->value / elem->variable->weight;
572 else if (cnst->usage < elem->value / elem->variable->weight)
573 cnst->usage = elem->value / elem->variable->weight;
575 make_elem_active(elem);
577 xbt_swag_insert(elem->variable->id, sys->keep_track);
580 XBT_DEBUG("Constraint Usage '%d' : %f", cnst->id_int, cnst->usage);
581 /* Saturated constraints update */
583 if(cnst->usage > 0) {
584 cnst_light_tab[cnst_light_num].cnst = cnst;
585 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
586 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
587 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
588 cnst_light_num, saturated_constraint_set, &min_usage);
593 saturated_variable_set_update( cnst_light_tab,
594 saturated_constraint_set,
597 /* Saturated variables update */
600 /* Fix the variables that have to be */
601 var_list = &(sys->saturated_variable_set);
603 xbt_swag_foreach(var, var_list) {
604 if (var->weight <= 0.0)
606 /* First check if some of these variables have reach their upper
607 bound and update min_usage accordingly. */
609 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
610 var->id_int, var->bound, var->weight, min_usage,
611 var->bound * var->weight);
612 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
614 min_bound = var->bound;
616 min_bound = MIN(min_bound, var->bound);
617 XBT_DEBUG("Updated min_bound=%f", min_bound);
622 while ((var = xbt_swag_getFirst(var_list))) {
626 var->value = min_usage / var->weight;
628 if (min_bound == var->bound)
629 var->value = var->bound;
631 xbt_swag_remove(var, var_list);
635 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
636 min_usage, var->id_int, var->weight, var->id_int, var->value);
641 for (i = 0; i < var->cnsts_number; i++) {
642 elem = &var->cnsts[i];
643 cnst = elem->constraint;
645 double_update(&(cnst->remaining), elem->value * var->value);
646 double_update(&(cnst->usage), elem->value / var->weight);
647 if(cnst->usage<=0 || cnst->remaining<=0) {
648 if (cnst->cnst_light) {
649 int index = (cnst->cnst_light-cnst_light_tab);
650 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
651 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
652 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
653 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
655 cnst->cnst_light = NULL;
658 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
660 make_elem_inactive(elem);
663 make_elem_inactive(elem);
664 elem_list = &(cnst->element_set);
665 xbt_swag_foreach(elem, elem_list) {
666 if (elem->variable->weight <= 0 || elem->variable->value > 0)
669 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
671 if (cnst->usage<=0 || cnst->remaining<=0) {
672 if(cnst->cnst_light) {
673 int index = (cnst->cnst_light-cnst_light_tab);
674 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p \t cnst_light_tab: %p ",
675 index,cnst_light_num, cnst, cnst->cnst_light, cnst_light_tab);
676 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
677 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
679 cnst->cnst_light = NULL;
682 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
686 xbt_swag_remove(var, var_list);
689 /* Find out which variables reach the maximum */
692 saturated_constraint_set->pos = 0;
694 for(pos=0; pos<cnst_light_num; pos++)
695 saturated_constraint_set_update(
696 cnst_light_tab[pos].remaining_over_usage,
698 saturated_constraint_set,
701 saturated_variable_set_update( cnst_light_tab,
702 saturated_constraint_set,
705 } while (cnst_light_num > 0);
708 if (sys->selective_update_active)
709 lmm_remove_all_modified_set(sys);
711 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
715 xbt_free(saturated_constraint_set->data);
716 xbt_free(saturated_constraint_set);
717 xbt_free(cnst_light_tab);
721 /* Not a O(1) function */
723 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
724 lmm_variable_t var, double value)
728 for (i = 0; i < var->cnsts_number; i++)
729 if (var->cnsts[i].constraint == cnst) {
730 var->cnsts[i].value = value;
732 lmm_update_modified_set(sys, cnst);
737 /** \brief Attribute the value bound to var->bound.
739 * \param sys the lmm_system_t
740 * \param var the lmm_variable_t
741 * \param bound the new bound to associate with var
743 * Makes var->bound equal to bound. Whenever this function is called
744 * a change is signed in the system. To
745 * avoid false system changing detection it is a good idea to test
746 * (bound != 0) before calling it.
749 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
755 if (var->cnsts_number)
756 lmm_update_modified_set(sys, var->cnsts[0].constraint);
760 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
766 if (weight == var->weight)
768 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
770 var->weight = weight;
771 xbt_swag_remove(var, &(sys->variable_set));
773 xbt_swag_insert_at_head(var, &(sys->variable_set));
775 xbt_swag_insert_at_tail(var, &(sys->variable_set));
777 for (i = 0; i < var->cnsts_number; i++) {
778 elem = &var->cnsts[i];
779 xbt_swag_remove(elem, &(elem->constraint->element_set));
781 xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
783 xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
786 lmm_update_modified_set(sys, elem->constraint);
794 XBT_INLINE double lmm_get_variable_weight(lmm_variable_t var)
799 XBT_INLINE void lmm_update_constraint_bound(lmm_system_t sys,
800 lmm_constraint_t cnst,
804 lmm_update_modified_set(sys, cnst);
808 XBT_INLINE int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
810 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
813 XBT_INLINE lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t
816 return xbt_swag_getFirst(&(sys->active_constraint_set));
819 XBT_INLINE lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t
824 return xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
827 #ifdef HAVE_LATENCY_BOUND_TRACKING
828 XBT_INLINE int lmm_is_variable_limited_by_latency(lmm_variable_t var)
830 return (double_equals(var->bound, var->value));
835 /** \brief Update the constraint set propagating recursively to
836 * other constraints so the system should not be entirely computed.
838 * \param sys the lmm_system_t
839 * \param cnst the lmm_constraint_t affected by the change
841 * A recursive algorithm to optimize the system recalculation selecting only
842 * constraints that have changed. Each constraint change is propagated
843 * to the list of constraints for each variable.
845 static void lmm_update_modified_set_rec(lmm_system_t sys,
846 lmm_constraint_t cnst)
850 xbt_swag_foreach(elem, &cnst->element_set) {
851 lmm_variable_t var = elem->variable;
852 s_lmm_element_t *cnsts = var->cnsts;
854 for (i = 0; var->visited != sys->visited_counter
855 && i < var->cnsts_number ; i++) {
856 if (cnsts[i].constraint != cnst
857 && !xbt_swag_belongs(cnsts[i].constraint,
858 &sys->modified_constraint_set)) {
859 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
860 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
863 var->visited = sys->visited_counter;
867 static void lmm_update_modified_set(lmm_system_t sys,
868 lmm_constraint_t cnst)
870 /* nothing to do if selective update isn't active */
871 if (sys->selective_update_active
872 && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
873 xbt_swag_insert(cnst, &sys->modified_constraint_set);
874 lmm_update_modified_set_rec(sys, cnst);
878 /** \brief Remove all constraints of the modified_constraint_set.
880 * \param sys the lmm_system_t
882 static void lmm_remove_all_modified_set(lmm_system_t sys)
884 if (++sys->visited_counter == 1) {
885 /* the counter wrapped around, reset each variable->visited */
887 xbt_swag_foreach(var, &sys->variable_set)
890 xbt_swag_reset(&sys->modified_constraint_set);