3 /* Copyright (c) 2004 Arnaud Legrand. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "xbt/sysdep.h"
10 #include "xbt/error.h"
11 #include "maxmin_private.h"
14 lmm_system_t lmm_system_new(void)
16 lmm_system_t l = NULL;
18 s_lmm_constraint_t cnst;
20 l = xbt_new0(s_lmm_system_t, 1);
23 xbt_swag_init(&(l->variable_set),
24 xbt_swag_offset(var, variable_set_hookup));
25 xbt_swag_init(&(l->constraint_set),
26 xbt_swag_offset(cnst, constraint_set_hookup));
28 xbt_swag_init(&(l->active_constraint_set),
29 xbt_swag_offset(cnst, active_constraint_set_hookup));
31 xbt_swag_init(&(l->saturated_variable_set),
32 xbt_swag_offset(var, saturated_variable_set_hookup));
33 xbt_swag_init(&(l->saturated_constraint_set),
34 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
39 void lmm_system_free(lmm_system_t sys)
41 lmm_variable_t var = NULL;
42 lmm_constraint_t cnst = NULL;
44 while ((var = extract_variable(sys)))
45 lmm_var_free(sys, var);
47 while ((cnst = extract_constraint(sys)))
48 lmm_cnst_free(sys, cnst);
53 void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
56 lmm_element_t elem = NULL;
60 for (i = 0; i < var->cnsts_number; i++) {
61 elem = &var->cnsts[i];
62 xbt_swag_remove(elem, &(elem->constraint->element_set));
63 if (xbt_swag_size(&(elem->constraint->element_set)))
64 make_constraint_inactive(sys, elem->constraint);
66 var->cnsts_number = 0;
69 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
72 lmm_variable_disable(sys, var);
78 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
80 /* xbt_assert0(xbt_fifo_size(&(cnst->row)), */
81 /* "This list should be empty!"); */
82 remove_active_constraint(sys, cnst);
86 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
87 xbt_maxmin_float_t bound_value)
89 lmm_constraint_t cnst = NULL;
92 cnst = xbt_new0(s_lmm_constraint_t, 1);
94 xbt_swag_init(&(cnst->element_set),
95 xbt_swag_offset(elem, element_set_hookup));
96 xbt_swag_init(&(cnst->active_element_set),
97 xbt_swag_offset(elem, active_element_set_hookup));
99 cnst->bound = bound_value;
101 insert_constraint(sys, cnst);
106 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
108 remove_constraint(sys, cnst);
109 lmm_cnst_free(sys, cnst);
112 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
113 xbt_maxmin_float_t weight,
114 xbt_maxmin_float_t bound,
115 int number_of_constraints)
117 lmm_variable_t var = NULL;
119 var = xbt_new0(s_lmm_variable_t, 1);
121 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
122 var->cnsts_size = number_of_constraints;
123 /* var->cnsts_number = 0; *//* Useless because of the calloc */
124 var->weight = weight;
127 insert_variable(sys, var);
132 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
134 remove_variable(sys, var);
135 lmm_var_free(sys, var);
138 xbt_maxmin_float_t lmm_variable_getvalue(lmm_variable_t var)
143 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
144 lmm_variable_t var, xbt_maxmin_float_t value)
146 lmm_element_t elem = NULL;
150 if (var->cnsts_number >= var->cnsts_size)
153 elem = &(var->cnsts[var->cnsts_number++]);
156 elem->constraint = cnst;
157 elem->variable = var;
159 insert_elem_in_constraint(elem);
161 make_constraint_active(sys, cnst);
164 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys, lmm_variable_t var, int num)
166 if(num<var->cnsts_number) return(var->cnsts[num].constraint);
170 int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
172 return(var->cnsts_number);
175 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys, lmm_constraint_t cnst,
178 if(!(*var)) xbt_swag_getFirst(&(cnst->element_set));
179 else *var=xbt_swag_getNext(*var,cnst->element_set.offset);
183 void *lmm_constraint_id(lmm_constraint_t cnst)
188 void *lmm_variable_id(lmm_variable_t var)
193 static void saturated_constraints_update(lmm_system_t sys,
194 lmm_constraint_t cnst,
195 xbt_maxmin_float_t * min_usage)
197 lmm_constraint_t useless_cnst = NULL;
201 if (cnst->remaining <= 0)
203 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
204 *min_usage = cnst->remaining / cnst->usage;
206 while ((useless_cnst = xbt_swag_getFirst(&(sys->saturated_constraint_set))))
207 xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
209 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
210 } else if (*min_usage == cnst->remaining / cnst->usage) {
211 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
215 static void saturated_variables_update(lmm_system_t sys)
217 lmm_constraint_t cnst = NULL;
218 xbt_swag_t cnst_list = NULL;
219 lmm_element_t elem = NULL;
220 xbt_swag_t elem_list = NULL;
224 cnst_list = &(sys->saturated_constraint_set);
225 while ((cnst = xbt_swag_getFirst(cnst_list))) {
226 /* xbt_swag_foreach(cnst, cnst_list) { */
227 elem_list = &(cnst->active_element_set);
228 xbt_swag_foreach(elem, elem_list)
229 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
230 xbt_swag_remove(cnst, cnst_list);
235 void lmm_solve(lmm_system_t sys)
237 lmm_variable_t var = NULL;
238 lmm_constraint_t cnst = NULL;
239 lmm_element_t elem = NULL;
240 xbt_swag_t cnst_list = NULL;
241 xbt_swag_t var_list = NULL;
242 xbt_swag_t elem_list = NULL;
243 xbt_maxmin_float_t min_usage = -1;
245 if(!(sys->modified)) return;
248 var_list = &(sys->variable_set);
249 xbt_swag_foreach(var, var_list) {
254 /* Compute Usage and store the variables that reach the maximum */
256 cnst_list = &(sys->active_constraint_set);
257 xbt_swag_foreach(cnst, cnst_list) {
259 elem_list = &(cnst->element_set);
260 cnst->remaining = cnst->bound;
262 xbt_swag_foreach(elem, elem_list) {
263 cnst->usage += elem->value / elem->variable->weight;
264 insert_active_elem_in_constraint(elem);
267 /* Saturated constraints update */
268 saturated_constraints_update(sys, cnst, &min_usage);
271 saturated_variables_update(sys);
273 /* Saturated variables update */
276 /* Fix the variables that have to be */
277 var_list = &(sys->saturated_variable_set);
280 xbt_swag_foreach(var, var_list) {
281 /* First check if some of these variables have reach their upper
282 bound and update min_usage accordingly. */
283 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
284 min_usage = var->bound / var->weight;
289 while ((var = xbt_swag_getFirst(var_list))) {
292 var->value = min_usage / var->weight;
296 for (i = 0; i < var->cnsts_number; i++) {
297 elem = &var->cnsts[i];
298 cnst = elem->constraint;
299 cnst->remaining -= elem->value * var->value;
300 cnst->usage -= elem->value / var->weight;
301 remove_active_elem_in_constraint(elem);
303 xbt_swag_remove(var, var_list);
306 /* Find out which variables reach the maximum */
307 cnst_list = &(sys->active_constraint_set);
309 xbt_swag_foreach(cnst, cnst_list) {
310 saturated_constraints_update(sys, cnst, &min_usage);
312 saturated_variables_update(sys);
314 } while (xbt_swag_size(&(sys->saturated_variable_set)));
319 /* Not a O(1) function */
321 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
322 lmm_variable_t var, xbt_maxmin_float_t value)
325 lmm_element_t elem = NULL;
328 for (i = 0; i < var->cnsts_number; i++)
329 if (var->cnsts[i].constraint == cnst) {
335 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
336 xbt_maxmin_float_t bound)
342 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
343 xbt_maxmin_float_t weight)
346 var->weight = weight;
349 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
350 xbt_maxmin_float_t bound)
356 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
358 return xbt_swag_belongs(cnst,&(sys->active_constraint_set));
362 /* void lmm_print(lmm_system_t sys) */
364 /* lmm_variable_t var = NULL; */
365 /* lmm_constraint_t cnst = NULL; */
366 /* lmm_element_t elem = NULL; */
367 /* xbt_swag_t cnst_list = NULL; */
368 /* xbt_swag_t var_list = NULL; */
369 /* xbt_swag_t elem_list = NULL; */
371 /* var_list = &(sys->variable_set); */
372 /* xbt_swag_foreach(var, var_list) { */
373 /* printf("%s : {\n",var->id); */
374 /* printf("\t %s : {\n",var->id); */