/* This program is free software; you can redistribute it and/or modify it
under the terms of the license (GNU LGPL) which comes with this package. */
+#include "xbt/sysdep.h"
+#include "xbt/error.h"
#include "maxmin_private.h"
+#include <stdlib.h>
+/* extern lmm_system_t Sys; */
+/* extern lmm_constraint_t L1; */
+/* extern lmm_constraint_t L2; */
+/* extern lmm_constraint_t L3; */
+
+/* extern lmm_variable_t R_1_2_3; */
+/* extern lmm_variable_t R_1; */
+/* extern lmm_variable_t R_2; */
+/* extern lmm_variable_t R_3; */
+
+
+lmm_system_t lmm_system_new(void)
+{
+ lmm_system_t l = NULL;
+ s_lmm_variable_t var;
+ s_lmm_constraint_t cnst;
+
+ l = xbt_new0(s_lmm_system_t, 1);
+
+ xbt_swag_init(&(l->variable_set),
+ xbt_swag_offset(var, variable_set_hookup));
+ xbt_swag_init(&(l->constraint_set),
+ xbt_swag_offset(cnst, constraint_set_hookup));
+
+ xbt_swag_init(&(l->active_constraint_set),
+ xbt_swag_offset(cnst, active_constraint_set_hookup));
+
+ xbt_swag_init(&(l->saturated_variable_set),
+ xbt_swag_offset(var, saturated_variable_set_hookup));
+ xbt_swag_init(&(l->saturated_constraint_set),
+ xbt_swag_offset(cnst, saturated_constraint_set_hookup));
+
+ return l;
+}
+
+void lmm_system_free(lmm_system_t sys)
+{
+ lmm_variable_t var = NULL;
+ lmm_constraint_t cnst = NULL;
+
+ while ((var = extract_variable(sys)))
+ lmm_var_free(sys, var);
+
+ while ((cnst = extract_constraint(sys)))
+ lmm_cnst_free(sys, cnst);
+
+ xbt_free(sys);
+}
+
+static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
+{
+ int i;
+ lmm_element_t elem = NULL;
+
+ for (i = 0; i < var->cnsts_number; i++) {
+ elem = &var->cnsts[i];
+ xbt_swag_extract(elem, &(elem->constraint->element_set));
+ if (xbt_swag_size(&(elem->constraint->element_set)))
+ make_constraint_inactive(sys, elem->constraint);
+ }
+ xbt_free(var->cnsts);
+ xbt_free(var);
+}
+
+static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
+{
+/* xbt_assert0(xbt_fifo_size(&(cnst->row)), */
+/* "This list should be empty!"); */
+ remove_active_constraint(sys, cnst);
+ xbt_free(cnst);
+}
+
+lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
+ xbt_maxmin_float_t bound_value)
+{
+ lmm_constraint_t cnst = NULL;
+ s_lmm_element_t elem;
+
+ cnst = xbt_new0(s_lmm_constraint_t, 1);
+/* cnst->id = id; */
+ xbt_swag_init(&(cnst->element_set),
+ xbt_swag_offset(elem, element_set_hookup));
+ xbt_swag_init(&(cnst->active_element_set),
+ xbt_swag_offset(elem, active_element_set_hookup));
+
+ cnst->bound = bound_value;
+ cnst->usage = 0;
+ insert_constraint(sys, cnst);
+
+ cnst->id = id;
+
+ return cnst;
+}
+
+void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
+{
+ remove_constraint(sys, cnst);
+ lmm_cnst_free(sys, cnst);
+}
+
+lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id,
+ xbt_maxmin_float_t weight,
+ xbt_maxmin_float_t bound,
+ int number_of_constraints)
+{
+ lmm_variable_t var = NULL;
+
+ var = xbt_new0(s_lmm_variable_t, 1);
+/* var->id = id; */
+ var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
+ var->cnsts_size = number_of_constraints;
+ /* var->cnsts_number = 0; *//* Useless because of the calloc */
+ var->weight = weight;
+ var->bound = bound;
+ var->value = -1;
+ insert_variable(sys, var);
+
+ var->id = id;
+
+ return var;
+}
+
+void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
+{
+ remove_variable(sys, var);
+ lmm_var_free(sys, var);
+}
+
+xbt_maxmin_float_t lmm_variable_getvalue(lmm_variable_t var)
+{
+ return (var->value);
+}
+
+void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
+ lmm_variable_t var, xbt_maxmin_float_t value)
+{
+ lmm_element_t elem = NULL;
+
+ if (var->cnsts_number >= var->cnsts_size)
+ abort();
+
+ elem = &(var->cnsts[var->cnsts_number++]);
+
+ elem->value = value;
+ elem->constraint = cnst;
+ elem->variable = var;
+
+ insert_elem_in_constraint(elem);
+
+ make_constraint_active(sys, cnst);
+}
+
+static void saturated_constraints_update(lmm_system_t sys,
+ lmm_constraint_t cnst,
+ xbt_maxmin_float_t * min_usage)
+{
+ lmm_constraint_t useless_cnst = NULL;
+
+ if (cnst->remaining <= 0)
+ return;
+ if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
+ xbt_swag_t active_elem_list = &(cnst->active_element_set);
+
+ *min_usage = cnst->remaining / cnst->usage;
+
+ while ((useless_cnst = xbt_swag_getFirst(&(sys->saturated_constraint_set))))
+ xbt_swag_extract(useless_cnst, &(sys->saturated_constraint_set));
+
+ xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
+ } else if (*min_usage == cnst->remaining / cnst->usage) {
+ xbt_swag_insert(cnst, &(sys->saturated_constraint_set));
+ }
+}
+
+static void saturated_variables_update(lmm_system_t sys)
+{
+ lmm_constraint_t cnst = NULL;
+ xbt_swag_t cnst_list = NULL;
+ lmm_element_t elem = NULL;
+ xbt_swag_t elem_list = NULL;
+
+ cnst_list = &(sys->saturated_constraint_set);
+ while ((cnst = xbt_swag_getFirst(cnst_list))) {
+/* xbt_swag_foreach(cnst, cnst_list) { */
+ elem_list = &(cnst->active_element_set);
+ xbt_swag_foreach(elem, elem_list)
+ xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
+ xbt_swag_extract(cnst, cnst_list);
+ }
+
+}
+
+void lmm_solve(lmm_system_t sys)
+{
+ lmm_variable_t var = NULL;
+ lmm_constraint_t cnst = NULL;
+ lmm_element_t elem = NULL;
+ xbt_swag_t cnst_list = NULL;
+ xbt_swag_t var_list = NULL;
+ xbt_swag_t elem_list = NULL;
+ xbt_maxmin_float_t min_usage = -1;
+
+ /* Init */
+ var_list = &(sys->variable_set);
+ xbt_swag_foreach(var, var_list) {
+ var->value = -1;
+ }
+
+
+ /* Compute Usage and store the variables that reach the maximum */
+
+ cnst_list = &(sys->active_constraint_set);
+ xbt_swag_foreach(cnst, cnst_list) {
+ /* INIT */
+ elem_list = &(cnst->element_set);
+ cnst->remaining = cnst->bound;
+ cnst->usage = 0;
+ xbt_swag_foreach(elem, elem_list) {
+ cnst->usage += elem->value / elem->variable->weight;
+ insert_active_elem_in_constraint(elem);
+ }
+
+ /* Saturated constraints update */
+ saturated_constraints_update(sys, cnst, &min_usage);
+ }
+
+ saturated_variables_update(sys);
+
+ /* Saturated variables update */
+
+ do {
+ /* Fix the variables that have to be */
+ var_list = &(sys->saturated_variable_set);
+
+
+ xbt_swag_foreach(var, var_list) {
+ /* First check if some of these variables have reach their upper
+ bound and update min_usage accordingly. */
+ if ((var->bound > 0) && (var->bound / var->weight < min_usage)) {
+ min_usage = var->bound / var->weight;
+ }
+ }
+
+
+ while ((var = xbt_swag_getFirst(var_list))) {
+ int i;
+
+ var->value = min_usage / var->weight;
+
+ /* Update usage */
+
+ for (i = 0; i < var->cnsts_number; i++) {
+ elem = &var->cnsts[i];
+ cnst = elem->constraint;
+ cnst->remaining -= elem->value * var->value;
+ cnst->usage -= elem->value / var->weight;
+ remove_active_elem_in_constraint(elem);
+ }
+ xbt_swag_extract(var, var_list);
+ }
+
+ /* Find out which variables reach the maximum */
+ cnst_list = &(sys->active_constraint_set);
+ min_usage = -1;
+ xbt_swag_foreach(cnst, cnst_list) {
+ saturated_constraints_update(sys, cnst, &min_usage);
+ }
+ saturated_variables_update(sys);
+
+ } while (xbt_swag_size(&(sys->saturated_variable_set)));
+}
+
+/* Not a O(1) function */
+
+void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
+ lmm_variable_t var, xbt_maxmin_float_t value)
+{
+ int i;
+ lmm_element_t elem = NULL;
+
+ for (i = 0; i < var->cnsts_number; i++)
+ if (var->cnsts[i].constraint == cnst) {
+ elem->value = value;
+ return;
+ }
+}
+
+void lmm_update_variable_bound(lmm_variable_t var,
+ xbt_maxmin_float_t bound)
+{
+ var->bound = bound;
+}
+
+void lmm_update_variable_weight(lmm_variable_t var,
+ xbt_maxmin_float_t weight)
+{
+ var->weight = weight;
+}
+
+void lmm_update_constraint_bound(lmm_constraint_t cnst,
+ xbt_maxmin_float_t bound)
+{
+ cnst->bound = bound;
+}
+
+int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
+{
+ return xbt_swag_belongs(cnst,&(sys->active_constraint_set));
+}
+
+
+/* void lmm_print(lmm_system_t sys) */
+/* { */
+/* lmm_variable_t var = NULL; */
+/* lmm_constraint_t cnst = NULL; */
+/* lmm_element_t elem = NULL; */
+/* xbt_swag_t cnst_list = NULL; */
+/* xbt_swag_t var_list = NULL; */
+/* xbt_swag_t elem_list = NULL; */
+
+/* var_list = &(sys->variable_set); */
+/* xbt_swag_foreach(var, var_list) { */
+/* printf("%s : {\n",var->id); */
+/* printf("\t %s : {\n",var->id); */
+/* } */
+/* } */
