return (var->bound);
}
+/* Replace the content of elem_a with elem_b. The content of elem_b is cleared. */
+static void renew_elem_entry(lmm_element_t elem_a, lmm_element_t elem_b)
+{
+ elem_a->constraint = elem_b->constraint;
+ elem_a->variable = elem_b->variable;
+ elem_a->value = elem_b->value;
+
+ /* If elem_b is in the element_set swag, register the new element to the swag. */
+ if (xbt_swag_remove(elem_b, &(elem_b->constraint->element_set))) {
+ if (elem_a->variable->weight)
+ xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->element_set));
+ else
+ xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->element_set));
+ }
+
+ if (xbt_swag_remove(elem_b, &(elem_b->constraint->active_element_set))) {
+ if (elem_a->variable->weight)
+ xbt_swag_insert_at_head(elem_a, &(elem_a->constraint->active_element_set));
+ else
+ xbt_swag_insert_at_tail(elem_a, &(elem_a->constraint->active_element_set));
+ }
+
+ elem_b->constraint = NULL;
+ elem_b->variable = NULL;
+ elem_b->value = 0;
+}
+
+void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst,
+ lmm_variable_t var)
+{
+ lmm_element_t elem = NULL;
+ int found = 0;
+
+ int i;
+ for (i = 0; i < var->cnsts_number; i++) {
+ elem = &(var->cnsts[i]);
+ if (elem->constraint == cnst) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
+ return;
+ }
+
+ sys->modified = 1;
+
+ XBT_DEBUG("remove elem(value %lf, cnst %p, var %p) in var %p",
+ elem->value, elem->constraint, elem->variable, var);
+
+
+
+ /* We are going to change the constraint object and the variable object.
+ * Propagate this change to other objects. Calling here (not after
+ * modification) is correct? */
+ lmm_update_modified_set(sys, cnst);
+ lmm_update_modified_set(sys, var->cnsts[0].constraint); // will look up element_set of this constraint, and then each var in the element_set, and each var->cnsts[i].
+
+
+
+ /* now var->cnsts[i] is not necessary any more */
+
+ xbt_swag_remove(elem, &(elem->constraint->element_set));
+ xbt_swag_remove(elem, &(elem->constraint->active_element_set));
+ elem->constraint = NULL;
+ elem->variable = NULL;
+ elem->value = 0;
+
+
+
+ /* We do not want to have an empty element entry before the last entry. So,
+ * plug up the hole with the last one. */
+ if (i < var->cnsts_number - 1)
+ renew_elem_entry(&var->cnsts[i], &var->cnsts[var->cnsts_number - 1]);
+
+ var->cnsts_number -= 1;
+
+
+ if (xbt_swag_size(&(cnst->element_set)) == 0)
+ make_constraint_inactive(sys, cnst);
+}
+
void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
lmm_variable_t var, double value)
{
