Add lmm_get_var_from_cnst

[simgrid.git] / src / surf / maxmin.c

diff --git a/src/surf/maxmin.c b/src/surf/maxmin.c
index 637555f..5300929 100644 (file)
--- a/src/surf/maxmin.c
+++ b/src/surf/maxmin.c
@@ -27,6 +27,7 @@ lmm_system_t lmm_system_new(void)
 
   l = xbt_new0(s_lmm_system_t, 1);
 
+  l->modified = 0;
   xbt_swag_init(&(l->variable_set),
                xbt_swag_offset(var, variable_set_hookup));
   xbt_swag_init(&(l->constraint_set),
@@ -62,6 +63,8 @@ void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
   int i;
   lmm_element_t elem = NULL;
 
+  sys->modified = 1;
+
   for (i = 0; i < var->cnsts_number; i++) {
     elem = &var->cnsts[i];
     xbt_swag_remove(elem, &(elem->constraint->element_set));
@@ -150,6 +153,8 @@ void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
 {
   lmm_element_t elem = NULL;
 
+  sys->modified = 1;
+
   if (var->cnsts_number >= var->cnsts_size)
     abort();
 
@@ -175,6 +180,14 @@ int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var)
   return(var->cnsts_number);
 }
 
+lmm_variable_t lmm_get_var_from_cnst(lmm_system_t sys, lmm_constraint_t cnst, 
+                                    lmm_variable_t *var)
+{
+  if(!(*var)) xbt_swag_getFirst(&(cnst->element_set));
+  else *var=xbt_swag_getNext(*var,cnst->element_set.offset);
+  return *var;
+}
+
 void *lmm_constraint_id(lmm_constraint_t cnst)
 {
   return cnst->id;
@@ -191,6 +204,8 @@ static void saturated_constraints_update(lmm_system_t sys,
 {
   lmm_constraint_t useless_cnst = NULL;
 
+  sys->modified = 1;
+
   if (cnst->remaining <= 0)
     return;
   if ((*min_usage < 0) || (*min_usage > cnst->remaining / cnst->usage)) {
@@ -212,6 +227,8 @@ static void saturated_variables_update(lmm_system_t sys)
   lmm_element_t elem = NULL;
   xbt_swag_t elem_list = NULL;
 
+  sys->modified = 1;
+
   cnst_list = &(sys->saturated_constraint_set);
   while ((cnst = xbt_swag_getFirst(cnst_list))) {
 /*   xbt_swag_foreach(cnst, cnst_list) { */
@@ -233,6 +250,8 @@ void lmm_solve(lmm_system_t sys)
   xbt_swag_t elem_list = NULL;
   xbt_maxmin_float_t min_usage = -1;
 
+  if(!(sys->modified)) return;
+
   /* Init */
   var_list = &(sys->variable_set);
   xbt_swag_foreach(var, var_list) {
@@ -301,6 +320,8 @@ void lmm_solve(lmm_system_t sys)
     saturated_variables_update(sys);
 
   } while (xbt_swag_size(&(sys->saturated_variable_set)));
+
+  sys->modified = 0;
 }
 
 /* Not a O(1) function */
@@ -311,6 +332,7 @@ void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
   int i;
   lmm_element_t elem = NULL;
 
+  sys->modified = 1;
   for (i = 0; i < var->cnsts_number; i++)
     if (var->cnsts[i].constraint == cnst) {
       elem->value = value;
@@ -318,21 +340,24 @@ void lmm_update(lmm_system_t sys, lmm_constraint_t cnst,
     }
 }
 
-void lmm_update_variable_bound(lmm_variable_t var,
+void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
                               xbt_maxmin_float_t bound)
 {
+  sys->modified = 1;
   var->bound = bound;
 }
 
-void lmm_update_variable_weight(lmm_variable_t var,
+void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
                                xbt_maxmin_float_t weight)
 {
+  sys->modified = 1;
   var->weight = weight;
 }
 
-void lmm_update_constraint_bound(lmm_constraint_t cnst,
+void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
                                 xbt_maxmin_float_t bound)
 {
+  sys->modified = 1;
   cnst->bound = bound;
 }