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,
84 xbt_maxmin_float_t bound_value)
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 xbt_maxmin_float_t weight,
113 xbt_maxmin_float_t bound,
114 int number_of_constraints)
116 lmm_variable_t var = NULL;
118 var = xbt_new0(s_lmm_variable_t, 1);
120 var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
121 var->cnsts_size = number_of_constraints;
122 /* var->cnsts_number = 0; *//* Useless because of the calloc */
123 var->weight = weight;
126 insert_variable(sys, var);
133 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
135 remove_variable(sys, var);
136 lmm_var_free(sys, var);
139 xbt_maxmin_float_t lmm_variable_getvalue(lmm_variable_t var)
144 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
145 lmm_variable_t var, xbt_maxmin_float_t value)
147 lmm_element_t elem = NULL;
149 if (var->cnsts_number >= var->cnsts_size)
152 elem = &(var->cnsts[var->cnsts_number++]);
155 elem->constraint = cnst;
156 elem->variable = var;
158 insert_elem_in_constraint(elem);
160 make_constraint_active(sys, cnst);
163 static void saturated_constraints_update(lmm_system_t sys,
164 lmm_constraint_t cnst,
165 xbt_maxmin_float_t * min_usage)
167 lmm_constraint_t useless_cnst = NULL;
169 if (cnst->remaining <= 0)
171 if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
172 xbt_swag_t active_elem_list = &(cnst->active_element_set);
174 *min_usage = cnst->remaining / cnst->usage;
176 while ((useless_cnst = xbt_swag_getFirst(&(sys->saturated_constraint_set))))
177 xbt_swag_extract(useless_cnst, &(sys->saturated_constraint_set));
179 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
180 } else if (*min_usage == cnst->remaining / cnst->usage) {
181 xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
185 static void saturated_variables_update(lmm_system_t sys)
187 lmm_constraint_t cnst = NULL;
188 xbt_swag_t cnst_list = NULL;
189 lmm_element_t elem = NULL;
190 xbt_swag_t elem_list = NULL;
192 cnst_list = &(sys->saturated_constraint_set);
193 while ((cnst = xbt_swag_getFirst(cnst_list))) {
194 /* xbt_swag_foreach(cnst, cnst_list) { */
195 elem_list = &(cnst->active_element_set);
196 xbt_swag_foreach(elem, elem_list)
197 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
198 xbt_swag_extract(cnst, cnst_list);
203 void lmm_solve(lmm_system_t sys)
205 lmm_variable_t var = NULL;
206 lmm_constraint_t cnst = NULL;
207 lmm_element_t elem = NULL;
208 xbt_swag_t cnst_list = NULL;
209 xbt_swag_t var_list = NULL;
210 xbt_swag_t elem_list = NULL;
211 xbt_maxmin_float_t min_usage = -1;
214 var_list = &(sys->variable_set);
215 xbt_swag_foreach(var, var_list) {
220 /* Compute Usage and store the variables that reach the maximum */
222 cnst_list = &(sys->active_constraint_set);
223 xbt_swag_foreach(cnst, cnst_list) {
225 elem_list = &(cnst->element_set);
226 cnst->remaining = cnst->bound;
228 xbt_swag_foreach(elem, elem_list) {
229 cnst->usage += elem->value / elem->variable->weight;
230 insert_active_elem_in_constraint(elem);
233 /* Saturated constraints update */
234 saturated_constraints_update(sys, cnst, &min_usage);
237 saturated_variables_update(sys);
239 /* Saturated variables update */
242 /* Fix the variables that have to be */
243 var_list = &(sys->saturated_variable_set);
246 xbt_swag_foreach(var, var_list) {
247 /* First check if some of these variables have reach their upper
248 bound and update min_usage accordingly. */
249 if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
250 min_usage = var->bound / var->weight;
255 while ((var = xbt_swag_getFirst(var_list))) {
258 var->value = min_usage / var->weight;
262 for (i = 0; i < var->cnsts_number; i++) {
263 elem = &var->cnsts[i];
264 cnst = elem->constraint;
265 cnst->remaining -= elem->value * var->value;
266 cnst->usage -= elem->value / var->weight;
267 remove_active_elem_in_constraint(elem);
269 xbt_swag_extract(var, var_list);
272 /* Find out which variables reach the maximum */
273 cnst_list = &(sys->active_constraint_set);
275 xbt_swag_foreach(cnst, cnst_list) {
276 saturated_constraints_update(sys, cnst, &min_usage);
278 saturated_variables_update(sys);
280 } while (xbt_swag_size(&(sys->saturated_variable_set)));
283 /* Not a O(1) function */
285 void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
286 lmm_variable_t var, xbt_maxmin_float_t value)
289 lmm_element_t elem = NULL;
291 for (i = 0; i < var->cnsts_number; i++)
292 if (var->cnsts[i].constraint == cnst) {
298 void lmm_update_variable_bound(lmm_variable_t var,
299 xbt_maxmin_float_t bound)
304 void lmm_update_variable_weight(lmm_variable_t var,
305 xbt_maxmin_float_t weight)
307 var->weight = weight;
310 void lmm_update_constraint_bound(lmm_constraint_t cnst,
311 xbt_maxmin_float_t bound)
316 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
318 return xbt_swag_belongs(cnst,&(sys->active_constraint_set));
322 /* void lmm_print(lmm_system_t sys) */
324 /* lmm_variable_t var = NULL; */
325 /* lmm_constraint_t cnst = NULL; */
326 /* lmm_element_t elem = NULL; */
327 /* xbt_swag_t cnst_list = NULL; */
328 /* xbt_swag_t var_list = NULL; */
329 /* xbt_swag_t elem_list = NULL; */
331 /* var_list = &(sys->variable_set); */
332 /* xbt_swag_foreach(var, var_list) { */
333 /* printf("%s : {\n",var->id); */
334 /* printf("\t %s : {\n",var->id); */