-/* Authors: Arnaud Legrand */
+/* $Id$ */
+
+/* Copyright (c) 2004 Arnaud Legrand. All rights reserved. */
/* 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. */
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
#include "xbt/sysdep.h"
-#include "xbt/error.h"
+#include "xbt/log.h"
+#include "xbt/mallocator.h"
#include "maxmin_private.h"
#include <stdlib.h>
+#include <stdio.h> /* sprintf */
+#include <math.h>
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf,
+ "Logging specific to SURF (maxmin)");
-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;
-
+static void *lmm_variable_mallocator_new_f(void);
+static void lmm_variable_mallocator_free_f(void *var);
+static void lmm_variable_mallocator_reset_f(void *var);
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),
xbt_swag_init(&(l->saturated_constraint_set),
xbt_swag_offset(cnst, saturated_constraint_set_hookup));
+ l->variable_mallocator = xbt_mallocator_new(64,
+ lmm_variable_mallocator_new_f,
+ lmm_variable_mallocator_free_f,
+ lmm_variable_mallocator_reset_f);
+
return l;
}
while ((cnst = extract_constraint(sys)))
lmm_cnst_free(sys, cnst);
- xbt_free(sys);
+ xbt_mallocator_free(sys->variable_mallocator);
+ free(sys);
}
-static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
+void lmm_variable_disable(lmm_system_t sys, lmm_variable_t var)
{
int i;
lmm_element_t elem = NULL;
+ XBT_IN2("(sys=%p, var=%p)", sys, var);
+ sys->modified = 1;
+
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)))
+ xbt_swag_remove(elem, &(elem->constraint->element_set));
+ xbt_swag_remove(elem, &(elem->constraint->active_element_set));
+ if (!xbt_swag_size(&(elem->constraint->element_set)))
make_constraint_inactive(sys, elem->constraint);
}
- xbt_free(var->cnsts);
- xbt_free(var);
+ var->cnsts_number = 0;
+ XBT_OUT;
+}
+
+static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
+{
+
+ lmm_variable_disable(sys, var);
+ free(var->cnsts);
+ xbt_mallocator_release(sys->variable_mallocator, 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!"); */
+/* xbt_assert0(xbt_swag_size(&(cnst->element_set)), */
+/* "This list should be empty!"); */
remove_active_constraint(sys, cnst);
- xbt_free(cnst);
+ free(cnst);
}
lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id,
- xbt_maxmin_float_t bound_value)
+ double bound_value)
{
lmm_constraint_t cnst = NULL;
s_lmm_element_t elem;
cnst = xbt_new0(s_lmm_constraint_t, 1);
-/* cnst->id = id; */
+ cnst->id = id;
xbt_swag_init(&(cnst->element_set),
xbt_swag_offset(elem, element_set_hookup));
xbt_swag_init(&(cnst->active_element_set),
cnst->bound = bound_value;
cnst->usage = 0;
+ cnst->shared = 1;
insert_constraint(sys, cnst);
- cnst->id = id;
-
return cnst;
}
+void lmm_constraint_shared(lmm_constraint_t cnst)
+{
+ cnst->shared = 0;
+}
+
+int lmm_constraint_is_shared(lmm_constraint_t cnst)
+{
+ return (cnst->shared);
+}
+
void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst)
{
remove_constraint(sys, cnst);
lmm_cnst_free(sys, cnst);
}
+static void *lmm_variable_mallocator_new_f(void)
+{
+ return xbt_new(s_lmm_variable_t, 1);
+}
+
+static void lmm_variable_mallocator_free_f(void *var)
+{
+ xbt_free(var);
+}
+
+static void lmm_variable_mallocator_reset_f(void *var)
+{
+ /* memset to zero like calloc */
+ memset(var, 0, sizeof(s_lmm_variable_t));
+}
+
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)
+ double weight,
+ double bound, int number_of_constraints)
{
lmm_variable_t var = NULL;
+ int i;
- var = xbt_new0(s_lmm_variable_t, 1);
-/* var->id = id; */
+ XBT_IN5("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)",
+ sys, id, weight, bound, number_of_constraints);
+
+ var = xbt_mallocator_get(sys->variable_mallocator);
+ var->id = id;
var->cnsts = xbt_new0(s_lmm_element_t, number_of_constraints);
+ for (i = 0; i < number_of_constraints; i++) {
+ /* Should be useless because of the
+ calloc but it seems to help valgrind... */
+ var->cnsts[i].element_set_hookup.next = NULL;
+ var->cnsts[i].element_set_hookup.prev = NULL;
+ var->cnsts[i].active_element_set_hookup.next = NULL;
+ var->cnsts[i].active_element_set_hookup.prev = NULL;
+ var->cnsts[i].constraint = NULL;
+ var->cnsts[i].variable = NULL;
+ var->cnsts[i].value = 0.0;
+ }
var->cnsts_size = number_of_constraints;
- /* var->cnsts_number = 0; *//* Useless because of the calloc */
+ var->cnsts_number = 0; /* Should be useless because of the
+ calloc but it seems to help valgrind... */
var->weight = weight;
var->bound = bound;
- var->value = -1;
- insert_variable(sys, var);
+ var->value = 0.0;
- var->id = id;
+ var->func_f = func_f_def;
+ var->func_fp = func_fp_def;
+ var->func_fpi = func_fpi_def;
+
+ if (weight)
+ xbt_swag_insert_at_head(var, &(sys->variable_set));
+ else
+ xbt_swag_insert_at_tail(var, &(sys->variable_set));
+ XBT_OUT;
return var;
}
lmm_var_free(sys, var);
}
-xbt_maxmin_float_t lmm_variable_getvalue(lmm_variable_t var)
+double lmm_variable_getvalue(lmm_variable_t var)
{
return (var->value);
}
+double lmm_variable_getbound(lmm_variable_t var)
+{
+ return (var->bound);
+}
+
void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst,
- lmm_variable_t var, xbt_maxmin_float_t value)
+ lmm_variable_t var, double value)
{
lmm_element_t elem = NULL;
- if (var->cnsts_number >= var->cnsts_size)
- abort();
+ sys->modified = 1;
+
+ xbt_assert0(var->cnsts_number < var->cnsts_size, "Too much constraints");
elem = &(var->cnsts[var->cnsts_number++]);
elem->constraint = cnst;
elem->variable = var;
- insert_elem_in_constraint(elem);
+ if (var->weight)
+ xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
+ else
+ xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
make_constraint_active(sys, cnst);
}
-static void saturated_constraints_update(lmm_system_t sys,
- lmm_constraint_t cnst,
- xbt_maxmin_float_t * min_usage)
+void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst,
+ lmm_variable_t var, double value)
+{
+ int i;
+ sys->modified = 1;
+
+ for (i = 0; i < var->cnsts_number; i++)
+ if (var->cnsts[i].constraint == cnst)
+ break;
+
+ if (i < var->cnsts_number) {
+ if(cnst->shared) var->cnsts[i].value += value;
+ else var->cnsts[i].value = MAX(var->cnsts[i].value,value);
+ } else
+ lmm_expand(sys, cnst, var, value);
+}
+
+void lmm_elem_set_value(lmm_system_t sys, lmm_constraint_t cnst,
+ lmm_variable_t var, double value)
+{
+ int i;
+
+ for (i = 0; i < var->cnsts_number; i++)
+ if (var->cnsts[i].constraint == cnst)
+ break;
+
+ if (i < var->cnsts_number) {
+ var->cnsts[i].value = value;
+ sys->modified = 1;
+ } else
+ DIE_IMPOSSIBLE;
+}
+
+lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys,
+ lmm_variable_t var, int num)
+{
+ if (num < var->cnsts_number)
+ return (var->cnsts[num].constraint);
+ else
+ return NULL;
+}
+
+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_element_t * elem)
+{
+ if (!(*elem))
+ *elem = xbt_swag_getFirst(&(cnst->element_set));
+ else
+ *elem = xbt_swag_getNext(*elem, cnst->element_set.offset);
+ if(*elem)
+ return (*elem)->variable;
+ else
+ return NULL;
+}
+
+void *lmm_constraint_id(lmm_constraint_t cnst)
+{
+ return cnst->id;
+}
+
+void *lmm_variable_id(lmm_variable_t var)
+{
+ return var->id;
+}
+
+static void saturated_constraint_set_update(lmm_system_t sys,
+ lmm_constraint_t cnst,
+ double *min_usage)
{
lmm_constraint_t useless_cnst = NULL;
- if (cnst->remaining <= 0)
+ XBT_IN3("sys=%p, cnst=%p, min_usage=%f", sys, cnst, *min_usage);
+ if (cnst->usage <= 0) {
+ XBT_OUT;
+ return;
+ }
+ if (cnst->remaining <= 0) {
+ XBT_OUT;
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;
+ LOG3(xbt_log_priority_trace,
+ "min_usage=%f (cnst->remaining=%f, cnst->usage=%f)", *min_usage,
+ cnst->remaining, cnst->usage);
+ while ((useless_cnst =
+ xbt_swag_getFirst(&(sys->saturated_constraint_set))))
+ xbt_swag_remove(useless_cnst, &(sys->saturated_constraint_set));
- while (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));
}
+ XBT_OUT;
}
-static void saturated_variables_update(lmm_system_t sys)
+static void saturated_variable_set_update(lmm_system_t sys)
{
lmm_constraint_t cnst = NULL;
xbt_swag_t cnst_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_foreach(elem, elem_list) {
+ if (elem->variable->weight <= 0)
+ break;
+ if ((elem->value > 0))
xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
- xbt_swag_extract(cnst, cnst_list);
+ }
+ xbt_swag_remove(cnst, cnst_list);
+ }
+}
+
+void lmm_print(lmm_system_t sys)
+{
+ lmm_constraint_t cnst = NULL;
+ lmm_element_t elem = NULL;
+ lmm_variable_t var = NULL;
+ xbt_swag_t cnst_list = NULL;
+ xbt_swag_t var_list = NULL;
+ xbt_swag_t elem_list = NULL;
+ char print_buf[1024];
+ char *trace_buf = xbt_malloc0(sizeof(char));
+ double sum = 0.0;
+
+ /* Printing Objective */
+ var_list = &(sys->variable_set);
+ sprintf(print_buf, "MAX-MIN ( ");
+ trace_buf =
+ xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ xbt_swag_foreach(var, var_list) {
+ sprintf(print_buf, "'%p'(%f) ", var, var->weight);
+ trace_buf =
+ xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ }
+ sprintf(print_buf, ")");
+ trace_buf =
+ xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ DEBUG1("%s", trace_buf);
+ trace_buf[0] = '\000';
+
+ DEBUG0("Constraints");
+ /* Printing Constraints */
+ cnst_list = &(sys->active_constraint_set);
+ xbt_swag_foreach(cnst, cnst_list) {
+ sum = 0.0;
+ elem_list = &(cnst->element_set);
+ sprintf(print_buf, "\t");
+ trace_buf =
+ xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ xbt_swag_foreach(elem, elem_list) {
+ sprintf(print_buf, "%f.'%p'(%f) + ", elem->value,
+ elem->variable, elem->variable->value);
+ trace_buf =
+ xbt_realloc(trace_buf,
+ strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ sum += elem->value * elem->variable->value;
+ }
+ sprintf(print_buf, "0 <= %f ('%p')", cnst->bound, cnst);
+ trace_buf =
+ xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+
+ if (!cnst->shared) {
+ sprintf(print_buf, " [MAX-Constraint]");
+ trace_buf =
+ xbt_realloc(trace_buf,
+ strlen(trace_buf) + strlen(print_buf) + 1);
+ strcat(trace_buf, print_buf);
+ }
+ DEBUG1("%s", trace_buf);
+ trace_buf[0] = '\000';
+ xbt_assert3(!double_positive(sum - cnst->bound),
+ "Incorrect value (%f is not smaller than %f): %g",
+ sum, cnst->bound, sum - cnst->bound);
+ }
+
+ DEBUG0("Variables");
+ /* Printing Result */
+ xbt_swag_foreach(var, var_list) {
+ if (var->bound > 0) {
+ DEBUG4("'%p'(%f) : %f (<=%f)", var, var->weight, var->value,
+ var->bound);
+ xbt_assert2(!double_positive(var->value - var->bound),
+ "Incorrect value (%f is not smaller than %f",
+ var->value, var->bound);
+ } else
+ DEBUG3("'%p'(%f) : %f", var, var->weight, var->value);
}
+ free(trace_buf);
}
void lmm_solve(lmm_system_t sys)
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;
+ double min_usage = -1;
+
+ if (!(sys->modified))
+ return;
/* Init */
var_list = &(sys->variable_set);
+ DEBUG1("Variable set : %d", xbt_swag_size(var_list));
xbt_swag_foreach(var, var_list) {
- var->value = -1;
+ int nb=0;
+ int i;
+ if(var->weight<=0.0) break;
+ var->value = 0.0;
+ for (i = 0; i < var->cnsts_number; i++) {
+ if(var->cnsts[i].value==0.0) nb++;
+ }
+ if((nb==var->cnsts_number) && (var->weight>0.0))
+ var->value = 1.0;
}
-
- /* Compute Usage and store the variables that reach the maximum */
-
+ /*
+ * Compute Usage and store the variables that reach the maximum.
+ */
cnst_list = &(sys->active_constraint_set);
+ DEBUG1("Active constraints : %d", xbt_swag_size(cnst_list));
xbt_swag_foreach(cnst, cnst_list) {
/* INIT */
- elem_list = &(cnst->element_set);
cnst->remaining = cnst->bound;
cnst->usage = 0;
+ elem_list = &(cnst->element_set);
+ cnst->usage = 0.0;
xbt_swag_foreach(elem, elem_list) {
- cnst->usage += elem->value / elem->variable->weight;
- insert_active_elem_in_constraint(elem);
+ if (elem->variable->weight <= 0)
+ break;
+ if ((elem->value > 0)) {
+ if (cnst->shared)
+ cnst->usage += elem->value / elem->variable->weight;
+ else if (cnst->usage < elem->value / elem->variable->weight)
+ cnst->usage = elem->value / elem->variable->weight;
+ DEBUG2("Constraint Usage %p : %f", cnst, cnst->usage);
+ make_elem_active(elem);
+ }
}
-
/* Saturated constraints update */
- saturated_constraints_update(sys, cnst, &min_usage);
+ saturated_constraint_set_update(sys, cnst, &min_usage);
}
-
- saturated_variables_update(sys);
+ saturated_variable_set_update(sys);
/* Saturated variables update */
/* Fix the variables that have to be */
var_list = &(sys->saturated_variable_set);
-
xbt_swag_foreach(var, var_list) {
+ if(var->weight<=0.0) DIE_IMPOSSIBLE;
/* 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;
+ DEBUG5
+ ("var=%p, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
+ var, var->bound, var->weight, min_usage,
+ var->bound * var->weight);
+ if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
+ min_usage = var->bound * var->weight;
+ DEBUG1("Updated min_usage=%f", min_usage);
}
}
int i;
var->value = min_usage / var->weight;
+ DEBUG5("Min usage: %f, Var(%p)->weight: %f, Var(%p)->value: %f ",
+ min_usage, var, var->weight, var, var->value);
+
/* 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);
+ if (cnst->shared) {
+ double_update(&(cnst->remaining), elem->value * var->value);
+ double_update(&(cnst->usage), elem->value / var->weight);
+ make_elem_inactive(elem);
+ } else { /* FIXME one day: We recompute usage.... :( */
+ cnst->usage = 0.0;
+ make_elem_inactive(elem);
+ xbt_swag_foreach(elem, elem_list) {
+ if (elem->variable->weight <= 0)
+ break;
+ if (elem->variable->value > 0)
+ break;
+ if ((elem->value > 0)) {
+ if (cnst->usage < elem->value / elem->variable->weight)
+ cnst->usage = elem->value / elem->variable->weight;
+ DEBUG2("Constraint Usage %p : %f", cnst, cnst->usage);
+ make_elem_active(elem);
+ }
+ }
+ }
}
- xbt_swag_extract(var, var_list);
+ xbt_swag_remove(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_constraint_set_update(sys, cnst, &min_usage);
}
- saturated_variables_update(sys);
+ saturated_variable_set_update(sys);
} while (xbt_swag_size(&(sys->saturated_variable_set)));
+
+ sys->modified = 0;
+ if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
+ lmm_print(sys);
+ }
}
/* 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)
+ lmm_variable_t var, double value)
{
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;
+ var->cnsts[i].value = value;
return;
}
}
-void lmm_update_variable_bound(lmm_variable_t var,
- xbt_maxmin_float_t bound)
+/** \brief Attribute the value bound to var->bound.
+ *
+ * \param sys the lmm_system_t
+ * \param var the lmm_variable_t
+ * \param bound the new bound to associate with var
+ *
+ * Makes var->bound equal to bound. Whenever this function is called
+ * a change is signed in the system. To
+ * avoid false system changing detection it is a good idea to test
+ * (bound != 0) before calling it.
+ *
+ */
+void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var,
+ double bound)
{
+ sys->modified = 1;
var->bound = bound;
}
-void lmm_update_variable_weight(lmm_variable_t var,
- xbt_maxmin_float_t weight)
+
+void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var,
+ double weight)
{
+ int i;
+ lmm_element_t elem;
+
+ if(weight==var->weight) return;
+ XBT_IN3("(sys=%p, var=%p, weight=%f)", sys, var, weight);
+ sys->modified = 1;
var->weight = weight;
+ xbt_swag_remove(var, &(sys->variable_set));
+ if (weight)
+ xbt_swag_insert_at_head(var, &(sys->variable_set));
+ else
+ xbt_swag_insert_at_tail(var, &(sys->variable_set));
+
+ for (i = 0; i < var->cnsts_number; i++) {
+ elem = &var->cnsts[i];
+ xbt_swag_remove(elem, &(elem->constraint->element_set));
+ if (weight)
+ xbt_swag_insert_at_head(elem, &(elem->constraint->element_set));
+ else
+ xbt_swag_insert_at_tail(elem, &(elem->constraint->element_set));
+ }
+ if(!weight)
+ var->value = 0.0;
+
+ XBT_OUT;
}
-void lmm_update_constraint_bound(lmm_constraint_t cnst,
- xbt_maxmin_float_t bound)
+double lmm_get_variable_weight(lmm_variable_t var)
{
- cnst->bound = bound;
+ return var->weight;
}
+void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst,
+ double bound)
+{
+ sys->modified = 1;
+ 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; */
+lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
+{
+ return xbt_swag_getFirst(&(sys->active_constraint_set));
+}
-/* var_list = &(sys->variable_set); */
-/* xbt_swag_foreach(var, var_list) { */
-/* printf("%s : {\n",var->id); */
-/* printf("\t %s : {\n",var->id); */
-/* } */
-/* } */
+lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys,
+ lmm_constraint_t cnst)
+{
+ return xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
+}
