1 /* Authors: Arnaud Legrand */
3 /* This program is free software; you can redistribute it and/or modify it
4 under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "xbt/sysdep.h"
8 #include "maxmin_private.h"
11 extern lmm_system_t Sys;
12 extern lmm_constraint_t L1;
13 extern lmm_constraint_t L2;
14 extern lmm_constraint_t L3;
16 extern lmm_variable_t R_1_2_3;
17 extern lmm_variable_t R_1;
18 extern lmm_variable_t R_2;
19 extern lmm_variable_t R_3;
22 lmm_system_t lmm_system_new(void)
24 lmm_system_t l = NULL;
26 s_lmm_constraint_t cnst;
28 l = xbt_new0(s_lmm_system_t, 1);
30 xbt_swag_init(&(l->variable_set),
31 xbt_swag_offset(var, variable_set_hookup));
32 xbt_swag_init(&(l->constraint_set),
33 xbt_swag_offset(cnst, constraint_set_hookup));
35 xbt_swag_init(&(l->active_constraint_set),
36 xbt_swag_offset(cnst, active_constraint_set_hookup));
38 xbt_swag_init(&(l->saturated_variable_set),
39 xbt_swag_offset(var, saturated_variable_set_hookup));
40 xbt_swag_init(&(l->saturated_constraint_set),
41 xbt_swag_offset(cnst, saturated_constraint_set_hookup));
46 void lmm_system_free(lmm_system_t sys)
48 lmm_variable_t var = NULL;
49 lmm_constraint_t cnst = NULL;
51 while ((var = extract_variable(sys)))
52 lmm_var_free(sys, var);
54 while ((cnst = extract_constraint(sys)))
55 lmm_cnst_free(sys, cnst);
60 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
63 lmm_element_t elem = NULL;
65 for (i = 0; i < var->cnsts_number; i++) {
66 elem = &var->cnsts[i];
67 xbt_swag_extract(elem, &(elem->constraint->element_set));
68 if (xbt_swag_size(&(elem->constraint->element_set)))
69 make_constraint_inactive(sys, elem->constraint);
75 static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
77 /* xbt_assert0(xbt_fifo_size(&(cnst->row)), */
78 /* "This list should be empty!"); */
79 remove_active_constraint(sys, cnst);
83 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
86 lmm_constraint_t cnst = NULL;
89 cnst = xbt_new0(s_lmm_constraint_t, 1);
91 xbt_swag_init(&(cnst->element_set),
92 xbt_swag_offset(elem, element_set_hookup));
93 xbt_swag_init(&(cnst->active_element_set),
94 xbt_swag_offset(elem, active_element_set_hookup));
96 cnst->bound = bound_value;
98 insert_constraint(sys, cnst);
105 void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
107 remove_constraint(sys, cnst);
108 lmm_cnst_free(sys, cnst);
111 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
112 FLOAT weight, FLOAT bound,
113 int number_of_constraints)
115 lmm_variable_t var = NULL;
117 var = xbt_new0(s_lmm_variable_t, 1);
119 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
120 var->cnsts_size = number_of_constraints;
121 /* var->cnsts_number = 0; *//* Useless because of the calloc */
122 var->weight = weight;
125 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 FLOAT lmm_variable_getvalue(lmm_variable_t var)
143 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
144 lmm_variable_t var, FLOAT value)
146 lmm_element_t elem = NULL;
148 if (var->cnsts_number >= var->cnsts_size)
151 elem = &(var->cnsts[var->cnsts_number++]);
154 elem->constraint = cnst;
155 elem->variable = var;
157 insert_elem_in_constraint(elem);
159 make_constraint_active(sys, cnst);
162 static void saturated_constraints_update(lmm_system_t sys,
163 lmm_constraint_t cnst,
166 lmm_constraint_t useless_cnst=NULL;
168 if(cnst->remaining<=0) return;
169 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
170 xbt_swag_t active_elem_list = &(cnst->active_element_set);
172 *min_usage = cnst->remaining / cnst->usage;
174 while (xbt_swag_extract
175 (useless_cnst, &(sys->saturated_constraint_set))) {
177 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
178 } else if (*min_usage == cnst->remaining / cnst->usage) {
179 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
183 static void saturated_variables_update(lmm_system_t sys)
185 lmm_constraint_t cnst = NULL;
186 xbt_swag_t cnst_list = NULL;
187 lmm_element_t elem = NULL;
188 xbt_swag_t elem_list = NULL;
190 cnst_list = &(sys->saturated_constraint_set);
191 while((cnst=xbt_swag_getFirst(cnst_list))) {
192 /* xbt_swag_foreach(cnst, cnst_list) { */
193 elem_list = &(cnst->active_element_set);
194 xbt_swag_foreach(elem, elem_list)
195 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
196 xbt_swag_extract(cnst,cnst_list);
201 void lmm_solve(lmm_system_t sys)
203 lmm_variable_t var = NULL;
204 lmm_constraint_t cnst = NULL;
205 lmm_element_t elem = NULL;
206 xbt_swag_t cnst_list = NULL;
207 xbt_swag_t var_list = NULL;
208 xbt_swag_t elem_list = NULL;
209 FLOAT min_usage = -1;
212 var_list=&(sys->variable_set);
213 xbt_swag_foreach(var, var_list) {
218 /* Compute Usage and store the variables that reach the maximum */
220 cnst_list = &(sys->active_constraint_set);
221 xbt_swag_foreach(cnst, cnst_list) {
223 elem_list = &(cnst->element_set);
224 cnst->remaining = cnst->bound;
226 xbt_swag_foreach(elem, elem_list) {
227 cnst->usage += elem->value / elem->variable->weight;
228 insert_active_elem_in_constraint(elem);
231 /* Saturated constraints update */
232 saturated_constraints_update(sys, cnst, &min_usage);
235 saturated_variables_update(sys);
237 /* Saturated variables update */
240 /* Fix the variables that have to be */
241 var_list=&(sys->saturated_variable_set);
244 xbt_swag_foreach(var, var_list) {
245 /* First check if some of these variables have reach their upper
246 bound and update min_usage accordingly. */
247 if((var->bound>0) && (var->bound / var->weight < min_usage)) {
248 min_usage = var->bound / var->weight;
253 while((var=xbt_swag_getFirst(var_list))) {
256 var->value = min_usage / var->weight;
260 for (i = 0; i < var->cnsts_number; i++) {
261 elem = &var->cnsts[i];
262 cnst = elem->constraint;
263 cnst->remaining -= elem->value * var->value;
264 cnst->usage -= elem->value / var->weight;
265 remove_active_elem_in_constraint(elem);
267 xbt_swag_extract(var,var_list);
270 /* Find out which variables reach the maximum */
271 cnst_list = &(sys->active_constraint_set);
273 xbt_swag_foreach(cnst, cnst_list) {
274 saturated_constraints_update(sys, cnst, &min_usage);
276 saturated_variables_update(sys);
278 } while (xbt_swag_size(&(sys->saturated_variable_set)));
281 /* Not a O(1) function */
283 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
284 lmm_variable_t var, FLOAT value)
287 lmm_element_t elem = NULL;
289 for (i = 0; i < var->cnsts_number; i++)
290 if(var->cnsts[i].constraint==cnst) {
296 void lmm_update_variable_bound(lmm_variable_t var, FLOAT bound)
301 void lmm_update_variable_weight(lmm_variable_t var, FLOAT weight)
306 void lmm_update_constraint_bound(lmm_constraint_t cnst,
314 /* void lmm_print(lmm_system_t sys) */
316 /* lmm_variable_t var = NULL; */
317 /* lmm_constraint_t cnst = NULL; */
318 /* lmm_element_t elem = NULL; */
319 /* xbt_swag_t cnst_list = NULL; */
320 /* xbt_swag_t var_list = NULL; */
321 /* xbt_swag_t elem_list = NULL; */
323 /* var_list = &(sys->variable_set); */
324 /* xbt_swag_foreach(var, var_list) { */
325 /* printf("%s : {\n",var->id); */
326 /* printf("\t %s : {\n",var->id); */