X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/2995193b7e30d03c04917852c4c0b26d26646273..305fbc7b720f845588b22de910245576971a5f97:/src/xbt/config.c

diff --git a/src/xbt/config.c b/src/xbt/config.c
index 49271b178e..c20d935027 100644
--- a/src/xbt/config.c
+++ b/src/xbt/config.c
@@ -9,18 +9,20 @@
 /* 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 <stdio.h>
 #include "xbt/misc.h"
 #include "xbt/sysdep.h"
 #include "xbt/log.h"
-#include "xbt/error.h"
+#include "xbt/ex.h"
 #include "xbt/dynar.h"
 #include "xbt/dict.h"
+#include "xbt/peer.h"
 
 #include "xbt/config.h" /* prototypes of this module */
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(config,xbt,"configuration support");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_cfg,xbt,"configuration support");
 
-/* xbt_cfgelm_t: the typedef corresponding to a config variable. 
+/* xbt_cfgelm_t: the typedef corresponding to a config variable.
 
    Both data and DTD are mixed, but fixing it now would prevent me to ever
    defend my thesis. */
@@ -30,35 +32,24 @@ typedef struct {
   e_xbt_cfgelm_type_t type;
   int min,max;
 
-  /* actual content 
-     (cannot be an union because type host uses both str and i) */
+  /* Callbacks */
+  xbt_cfg_cb_t cb_set;
+  xbt_cfg_cb_t cb_rm;
+
+  /* actual content
+     (cannot be an union because type peer uses both str and i) */
   xbt_dynar_t content;
 } s_xbt_cfgelm_t,*xbt_cfgelm_t;
 
 static const char *xbt_cfgelm_type_name[xbt_cfgelm_type_count]=
-  {"int","double","string","host"};
+{"int","double","string","peer","any"};
 
 /* Internal stuff used in cache to free a variable */
 static void xbt_cfgelm_free(void *data);
 
 /* Retrieve the variable we'll modify */
-static xbt_error_t xbt_cfgelm_get(xbt_cfg_t cfg, const char *name,
-				    e_xbt_cfgelm_type_t type,
-				    /* OUT */ xbt_cfgelm_t *whereto);
-
-void xbt_cfg_str_free(void *d);
-void xbt_cfg_host_free(void *d);
-
-void xbt_cfg_str_free(void *d){
-  free(*(void**)d);
-}
-void xbt_cfg_host_free(void *d){
-  xbt_host_t *h=(xbt_host_t*) *(void**)d; 
-  if (h) {
-    if (h->name) free(h->name);
-    free(h);
-  }
-}
+static xbt_cfgelm_t xbt_cfgelm_get(xbt_cfg_t cfg, const char *name,
+                                   e_xbt_cfgelm_type_t type);
 
 /*----[ Memory management ]-----------------------------------------------*/
 
@@ -72,7 +63,7 @@ xbt_cfg_t xbt_cfg_new(void) {
   return (xbt_cfg_t)xbt_dict_new();
 }
 
-/** @brief Copy an existing configuration set
+/** \brief Copy an existing configuration set
  *
  * \arg whereto the config set to be created
  * \arg tocopy the source data
@@ -82,20 +73,23 @@ xbt_cfg_t xbt_cfg_new(void) {
 
 void
 xbt_cfg_cpy(xbt_cfg_t tocopy,xbt_cfg_t *whereto) {
-  xbt_dict_cursor_t cursor=NULL; 
+  xbt_dict_cursor_t cursor=NULL;
   xbt_cfgelm_t variable=NULL;
   char *name=NULL;
-  
+
+  DEBUG1("Copy cfg set %p",tocopy);
   *whereto=NULL;
   xbt_assert0(tocopy,"cannot copy NULL config");
 
   xbt_dict_foreach((xbt_dict_t)tocopy,cursor,name,variable) {
-    xbt_cfg_register(*whereto, name, variable->type, variable->min, variable->max);
+    xbt_cfg_register(*whereto, name, variable->type, variable->min, variable->max,
+                     variable->cb_set, variable->cb_rm);
   }
 }
 
 /** @brief Destructor */
 void xbt_cfg_free(xbt_cfg_t *cfg) {
+  DEBUG1("Frees cfg set %p",cfg);
   xbt_dict_free((xbt_dict_t*)cfg);
 }
 
@@ -107,15 +101,15 @@ void xbt_cfg_free(xbt_cfg_t *cfg) {
  */
 void xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
   xbt_dict_t dict = (xbt_dict_t) cfg;
-  xbt_dict_cursor_t cursor=NULL; 
+  xbt_dict_cursor_t cursor=NULL;
   xbt_cfgelm_t variable=NULL;
   char *key=NULL;
-  int i; 
+  int i;
   int size;
   int ival;
   char *sval;
   double dval;
-  xbt_host_t *hval;
+  xbt_peer_t hval;
 
   if (name)
     printf("%s>> Dumping of the config set '%s':\n",indent,name);
@@ -124,42 +118,43 @@ void xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
     printf("%s  %s:",indent,key);
 
     size = xbt_dynar_length(variable->content);
-    printf("%d_to_%d_%s. Actual size=%d. List of values:\n",
-	   variable->min,variable->max,xbt_cfgelm_type_name[variable->type],
-	   size);
+    printf("%d_to_%d_%s. Actual size=%d. prerm=%p,postset=%p, List of values:\n",
+           variable->min,variable->max,xbt_cfgelm_type_name[variable->type],
+           size,
+           variable->cb_rm, variable->cb_set);
 
     switch (variable->type) {
-       
-    case xbt_cfgelm_int:
-      for (i=0; i<size; i++) {
-	ival = xbt_dynar_get_as(variable->content,i,int);
-	printf ("%s    %d\n",indent,ival);
-      }
-      break;
 
-    case xbt_cfgelm_double:
-      for (i=0; i<size; i++) {
-	dval = xbt_dynar_get_as(variable->content,i,double);
-	printf ("%s    %f\n",indent,dval);
-      }
-      break;
-
-    case xbt_cfgelm_string:
-      for (i=0; i<size; i++) {
-	sval = xbt_dynar_get_as(variable->content,i,char*);
-	printf ("%s    %s\n",indent,sval);
-      }
-      break;
-
-    case xbt_cfgelm_host:
-      for (i=0; i<size; i++) {
-	hval = xbt_dynar_get_as(variable->content,i,xbt_host_t*);
-	printf ("%s    %s:%d\n",indent,hval->name,hval->port);
-      }
-      break;
-
-    default:
-      printf("%s    Invalid type!!\n",indent);
+      case xbt_cfgelm_int:
+        for (i=0; i<size; i++) {
+          ival = xbt_dynar_get_as(variable->content,i,int);
+          printf ("%s    %d\n",indent,ival);
+        }
+        break;
+
+      case xbt_cfgelm_double:
+        for (i=0; i<size; i++) {
+          dval = xbt_dynar_get_as(variable->content,i,double);
+          printf ("%s    %f\n",indent,dval);
+        }
+        break;
+
+      case xbt_cfgelm_string:
+        for (i=0; i<size; i++) {
+          sval = xbt_dynar_get_as(variable->content,i,char*);
+          printf ("%s    %s\n",indent,sval);
+        }
+        break;
+
+      case xbt_cfgelm_peer:
+        for (i=0; i<size; i++) {
+          hval = xbt_dynar_get_as(variable->content,i,xbt_peer_t);
+          printf ("%s    %s:%d\n",indent,hval->name,hval->port);
+        }
+        break;
+
+      default:
+        printf("%s    Invalid type!!\n",indent);
     }
 
   }
@@ -178,6 +173,7 @@ void xbt_cfg_dump(const char *name,const char *indent,xbt_cfg_t cfg) {
 void xbt_cfgelm_free(void *data) {
   xbt_cfgelm_t c=(xbt_cfgelm_t)data;
 
+  DEBUG1("Frees cfgelm %p",c);
   if (!c) return;
   xbt_dynar_free(&(c->content));
   free(c);
@@ -195,61 +191,69 @@ void xbt_cfgelm_free(void *data) {
 
 void
 xbt_cfg_register(xbt_cfg_t cfg,
-		  const char *name, e_xbt_cfgelm_type_t type,
-		  int min, int max){
+                 const char *name, e_xbt_cfgelm_type_t type,
+                 int min, int max,
+                 xbt_cfg_cb_t cb_set,  xbt_cfg_cb_t cb_rm){
   xbt_cfgelm_t res;
-  xbt_error_t errcode;
 
-  DEBUG4("Register cfg elm %s (%d to %d %s)",name,min,max,xbt_cfgelm_type_name[type]);
-  errcode = xbt_dict_get((xbt_dict_t)cfg,name,(void**)&res);
+  xbt_assert(cfg);
+  xbt_assert4(type>=xbt_cfgelm_int && type<=xbt_cfgelm_peer,
+              "type of %s not valid (%d should be between %d and %d)",
+              name,type,xbt_cfgelm_int, xbt_cfgelm_peer);
+  res = xbt_dict_get_or_null((xbt_dict_t)cfg,name);
 
-  if (errcode == no_error) {
+  if (res) {
     WARN1("Config elem %s registered twice.",name);
     /* Will be removed by the insertion of the new one */
-  } 
-  xbt_assert_error(mismatch_error);
+  }
 
   res=xbt_new(s_xbt_cfgelm_t,1);
+  DEBUG7("Register cfg elm %s (%d to %d %s (=%d) @%p in set %p)",
+         name,min,max,xbt_cfgelm_type_name[type],type,res,cfg);
 
   res->type=type;
   res->min=min;
   res->max=max;
+  res->cb_set = cb_set;
+  res->cb_rm  = cb_rm;
 
   switch (type) {
-  case xbt_cfgelm_int:
-    res->content = xbt_dynar_new(sizeof(int), NULL);
-    break;
+    case xbt_cfgelm_int:
+      res->content = xbt_dynar_new(sizeof(int), NULL);
+      break;
 
-  case xbt_cfgelm_double:
-    res->content = xbt_dynar_new(sizeof(double), NULL);
-    break;
+    case xbt_cfgelm_double:
+      res->content = xbt_dynar_new(sizeof(double), NULL);
+      break;
 
-  case xbt_cfgelm_string:
-   res->content = xbt_dynar_new(sizeof(char*),&xbt_cfg_str_free);
-   break;
+    case xbt_cfgelm_string:
+      res->content = xbt_dynar_new(sizeof(char*),xbt_free_ref);
+      break;
 
-  case xbt_cfgelm_host:
-   res->content = xbt_dynar_new(sizeof(xbt_host_t*),&xbt_cfg_host_free);
-   break;
+    case xbt_cfgelm_peer:
+      res->content = xbt_dynar_new(sizeof(xbt_peer_t),xbt_peer_free_voidp);
+      break;
 
-  default:
-    ERROR1("%d is an invalide type code",type);
+    default:
+      ERROR1("%d is an invalide type code",type);
   }
-    
+
   xbt_dict_set((xbt_dict_t)cfg,name,res,&xbt_cfgelm_free);
 }
 
-/** @brief Unregister an element from a config set. 
- * 
+/** @brief Unregister an element from a config set.
+ *
  *  @arg cfg the config set
  *  @arg name the name of the elem to be freed
- * 
+ *
  *  Note that it removes both the description and the actual content.
+ *  Throws not_found when no such element exists.
  */
 
-xbt_error_t
+void
 xbt_cfg_unregister(xbt_cfg_t cfg,const char *name) {
-  return xbt_dict_remove((xbt_dict_t)cfg,name);
+  DEBUG2("Unregister elm '%s' from set %p",name,cfg);
+  xbt_dict_remove((xbt_dict_t)cfg,name);
 }
 
 /**
@@ -258,238 +262,202 @@ xbt_cfg_unregister(xbt_cfg_t cfg,const char *name) {
  * @arg cfg the config set
  * @arg entry a string describing the element to register
  *
- * The string may consist in several variable description separated by a space. 
+ * The string may consist in several variable descriptions separated by a space.
  * Each of them must use the following syntax: \<name\>:\<min nb\>_to_\<max nb\>_\<type\>
- * with type being one of  'string','int', 'host' or 'double'.
+ * with type being one of  'string','int', 'peer' or 'double'.
  */
 
-xbt_error_t
+void
 xbt_cfg_register_str(xbt_cfg_t cfg,const char *entry) {
   char *entrycpy=xbt_strdup(entry);
   char *tok;
 
   int min,max;
   e_xbt_cfgelm_type_t type;
+  DEBUG1("Register string '%s'",entry);
 
   tok=strchr(entrycpy, ':');
-  if (!tok) {
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2(tok,"Invalid config element descriptor: %s%s",
+              entry,
+              "; Should be <name>:<min nb>_to_<max nb>_<type>");
   *(tok++)='\0';
 
   min=strtol(tok, &tok, 10);
-  if (!tok) {
-    ERROR1("Invalid minimum in config element descriptor %s",entry);
-    free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert1(tok,"Invalid minimum in config element descriptor %s",entry);
 
-  if (!strcmp(tok,"_to_")){
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2(strcmp(tok,"_to_"),
+              "Invalid config element descriptor : %s%s",
+              entry,
+              "; Should be <name>:<min nb>_to_<max nb>_<type>");
   tok += strlen("_to_");
 
   max=strtol(tok, &tok, 10);
-  if (!tok) {
-    ERROR1("Invalid maximum in config element descriptor %s",entry);
-    free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert1(tok,"Invalid maximum in config element descriptor %s",entry);
 
-  if (*(tok++)!='_') {
-    ERROR3("%s%s%s",
-	  "Invalid config element descriptor: ",entry,
-	  "; Should be <name>:<min nb>_to_<max nb>_<type>");
-    free(entrycpy);
-    xbt_abort();
-  }
+  xbt_assert2( *(tok++) =='_',
+               "Invalid config element descriptor: %s%s",entry,
+               "; Should be <name>:<min nb>_to_<max nb>_<type>");
 
-  for (type=0; 
-       type<xbt_cfgelm_type_count && strcmp(tok,xbt_cfgelm_type_name[type]); 
-       type++);
-  if (type == xbt_cfgelm_type_count) {
-    ERROR3("%s%s%s",
-	  "Invalid type in config element descriptor: ",entry,
-	  "; Should be one of 'string', 'int', 'host' or 'double'.");
-    free(entrycpy);
-    xbt_abort();
-  }
+  for (type=0;
+  type<xbt_cfgelm_type_count && strcmp(tok,xbt_cfgelm_type_name[type]);
+  type++);
+  xbt_assert2(type < xbt_cfgelm_type_count,
+              "Invalid type in config element descriptor: %s%s",entry,
+              "; Should be one of 'string', 'int', 'peer' or 'double'.");
 
-  xbt_cfg_register(cfg,entrycpy,type,min,max);
+  xbt_cfg_register(cfg,entrycpy,type,min,max,NULL,NULL);
 
   free(entrycpy); /* strdup'ed by dict mechanism, but cannot be const */
-  return no_error;
 }
 
 /** @brief Check that each variable have the right amount of values */
 
-xbt_error_t
+void
 xbt_cfg_check(xbt_cfg_t cfg) {
-  xbt_dict_cursor_t cursor; 
+  xbt_dict_cursor_t cursor;
   xbt_cfgelm_t variable;
   char *name;
   int size;
 
   xbt_assert0(cfg,"NULL config set.");
+  DEBUG1("Check cfg set %p",cfg);
 
   xbt_dict_foreach((xbt_dict_t)cfg,cursor,name,variable) {
     size = xbt_dynar_length(variable->content);
-    if (variable->min > size) { 
-      ERROR4("Config elem %s needs at least %d %s, but there is only %d values.",
-	     name,
-	     variable->min,
-	     xbt_cfgelm_type_name[variable->type],
-	     size); 
+    if (variable->min > size) {
       xbt_dict_cursor_free(&cursor);
-      return mismatch_error;
+      THROW4(mismatch_error,0,
+             "Config elem %s needs at least %d %s, but there is only %d values.",
+             name,
+             variable->min,
+             xbt_cfgelm_type_name[variable->type],
+             size);
     }
 
-    if (variable->max < size) {
-      ERROR4("Config elem %s accepts at most %d %s, but there is %d values.",
-	     name,
-	     variable->max,
-	     xbt_cfgelm_type_name[variable->type],
-	     size);
+    if (variable->max > 0 && variable->max < size) {
       xbt_dict_cursor_free(&cursor);
-      return mismatch_error;
+      THROW4(mismatch_error,0,
+             "Config elem %s accepts at most %d %s, but there is %d values.",
+             name,
+             variable->max,
+             xbt_cfgelm_type_name[variable->type],
+             size);
     }
-
   }
 
   xbt_dict_cursor_free(&cursor);
-  return no_error;
 }
 
-static xbt_error_t xbt_cfgelm_get(xbt_cfg_t  cfg,
-				    const char *name,
-				    e_xbt_cfgelm_type_t type,
-				    /* OUT */ xbt_cfgelm_t *whereto){
-   
-  xbt_error_t errcode = xbt_dict_get((xbt_dict_t)cfg,name,
-				       (void**)whereto);
-
-  if (errcode == mismatch_error) {
-    ERROR1("No registered variable %s in this config set",
-	   name);
-    return mismatch_error;
-  }
-  if (errcode != no_error)
-     return errcode;
+static xbt_cfgelm_t xbt_cfgelm_get(xbt_cfg_t  cfg,
+                                   const char *name,
+                                   e_xbt_cfgelm_type_t type){
+  xbt_cfgelm_t res=NULL;
+
+  res = xbt_dict_get_or_null((xbt_dict_t)cfg,name);
+  if (!res)
+    THROW1(not_found_error,0,
+           "No registered variable '%s' in this config set",name);
 
-  xbt_assert3((*whereto)->type == type,
-	       "You tried to access to the config element %s as an %s, but its type is %s.",
-	       name,
-	       xbt_cfgelm_type_name[type],
-	       xbt_cfgelm_type_name[(*whereto)->type]);
+  xbt_assert3(type == xbt_cfgelm_any || res->type == type,
+              "You tried to access to the config element %s as an %s, but its type is %s.",
+              name,
+              xbt_cfgelm_type_name[type],
+              xbt_cfgelm_type_name[res->type]);
 
-  return no_error;
+  return res;
 }
 
 /** @brief Get the type of this variable in that configuration set
  *
  * \arg cfg the config set
- * \arg name the name of the element 
+ * \arg name the name of the element
  * \arg type the result
  *
  */
 
-xbt_error_t
-xbt_cfg_get_type(xbt_cfg_t cfg, const char *name, 
-		      /* OUT */e_xbt_cfgelm_type_t *type) {
+e_xbt_cfgelm_type_t
+xbt_cfg_get_type(xbt_cfg_t cfg, const char *name) {
 
-  xbt_cfgelm_t variable;
-  xbt_error_t errcode;
-
-  TRYCATCH(mismatch_error,xbt_dict_get((xbt_dict_t)cfg,name,(void**)&variable));
+  xbt_cfgelm_t variable = NULL;
 
-  if (errcode == mismatch_error) {
-    ERROR1("Can't get the type of '%s' since this variable does not exist",
-	   name);
-    return mismatch_error;
-  }
+  variable = xbt_dict_get_or_null((xbt_dict_t)cfg,name);
+  if (!variable)
+    THROW1(not_found_error,0,
+           "Can't get the type of '%s' since this variable does not exist",name);
 
-  *type=variable->type;
+  INFO1("type in variable = %d",variable->type);
 
-  return no_error;
+  return variable->type;
 }
 
 /*----[ Setting ]---------------------------------------------------------*/
 /**  @brief va_args version of xbt_cfg_set
  *
  * \arg cfg config set to fill
- * \arg varargs NULL-terminated list of pairs {(const char*)key, value}
+ * \arg n   variable name
+ * \arg pa  variable value
  *
  * Add some values to the config set.
- * \warning if the list isn't NULL terminated, it will segfault. 
  */
-xbt_error_t
-xbt_cfg_set_vargs(xbt_cfg_t cfg, va_list pa) {
-  char *str,*name;
+void
+xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name, va_list pa) {
+  char *str;
   int i;
   double d;
-  e_xbt_cfgelm_type_t type;
+  e_xbt_cfgelm_type_t type=0; /* Set a dummy value to make gcc happy. It cannot get uninitialized */
 
-  xbt_error_t errcode;
-  
-  while ((name=va_arg(pa,char *))) {
+  xbt_ex_t e;
 
-    if (!xbt_cfg_get_type(cfg,name,&type)) {
-      ERROR1("Can't set the property '%s' since it's not registered",name);
-      return mismatch_error;
+  TRY {
+    type = xbt_cfg_get_type(cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,"Can't set the property '%s' since it's not registered",name);
     }
+    RETHROW;
+  }
 
-    switch (type) {
-    case xbt_cfgelm_host:
+  switch (type) {
+    case xbt_cfgelm_peer:
       str = va_arg(pa, char *);
       i=va_arg(pa,int);
-      TRY(xbt_cfg_set_host(cfg,name,str,i));
+      xbt_cfg_set_peer(cfg,name,str,i);
       break;
-      
+
     case xbt_cfgelm_string:
       str=va_arg(pa, char *);
-      TRY(xbt_cfg_set_string(cfg, name, str));
+      xbt_cfg_set_string(cfg, name, str);
       break;
 
     case xbt_cfgelm_int:
       i=va_arg(pa,int);
-      TRY(xbt_cfg_set_int(cfg,name,i));
+      xbt_cfg_set_int(cfg,name,i);
       break;
 
     case xbt_cfgelm_double:
       d=va_arg(pa,double);
-      TRY(xbt_cfg_set_double(cfg,name,d));
+      xbt_cfg_set_double(cfg,name,d);
       break;
 
-    default: 
-      RAISE1(unknown_error,"Config element variable %s not valid.",name);
-    }
+    default:
+      xbt_assert2(0,"Config element variable %s not valid (type=%d)",name,type);
   }
-  return no_error;
 }
 
 /** @brief Add a NULL-terminated list of pairs {(char*)key, value} to the set
  *
  * \arg cfg config set to fill
- * \arg varargs NULL-terminated list of pairs {(const char*)key, value}
+ * \arg name variable name
+ * \arg varargs variable value
  *
- * \warning if the list isn't NULL terminated, it will segfault. 
  */
-xbt_error_t xbt_cfg_set(xbt_cfg_t cfg, ...) {
+void xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...) {
   va_list pa;
-  xbt_error_t errcode;
 
-  va_start(pa,cfg);
-  errcode=xbt_cfg_set_vargs(cfg,pa);
+  va_start(pa,name);
+  xbt_cfg_set_vargs(cfg,name,pa);
   va_end(pa);
-  return errcode;
 }
 
 /** @brief Add values parsed from a string into a config set
@@ -497,29 +465,30 @@ xbt_error_t xbt_cfg_set(xbt_cfg_t cfg, ...) {
  * \arg cfg config set to fill
  * \arg options a string containing the content to add to the config set. This
  * is a '\\t',' ' or '\\n' separated list of variables. Each individual variable is
- * like "[name]:[value]" where [name] is the name of an already registred 
+ * like "[name]:[value]" where [name] is the name of an already registred
  * variable, and [value] conforms to the data type under which this variable was
  * registred.
  *
  * @todo This is a crude manual parser, it should be a proper lexer.
  */
 
-xbt_error_t
+void
 xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
+  xbt_ex_t e;
+
   int i;
   double d;
   char *str;
 
-  xbt_cfgelm_t variable;
+  xbt_cfgelm_t variable=NULL;
   char *optionlist_cpy;
   char *option,  *name,*val;
 
   int len;
-  xbt_error_t errcode;
 
   XBT_IN;
   if (!options || !strlen(options)) { /* nothing to do */
-    return no_error;
+    return;
   }
   optionlist_cpy=xbt_strdup(options);
 
@@ -527,35 +496,35 @@ xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
   option=optionlist_cpy;
   while (1) { /* breaks in the code */
 
-    if (!option) 
+    if (!option)
       break;
     name=option;
     len=strlen(name);
     DEBUG3("Still to parse and set: '%s'. len=%d; option-name=%ld",
-	   name,len,(long)(option-name));
+           name,len,(long)(option-name));
 
     /* Pass the value */
     while (option-name<=(len-1) && *option != ' ' && *option != '\n' && *option != '\t') {
-      DEBUG1("Take %c.\n",*option);
+      DEBUG1("Take %c.",*option);
       option++;
     }
     if (option-name == len) {
-      DEBUG0("Boundary=EOL\n");
+      DEBUG0("Boundary=EOL");
       option=NULL; /* don't do next iteration */
 
     } else {
-      DEBUG3("Boundary on '%c'. len=%d;option-name=%d\n",
-	     *option,len,option-name);
+      DEBUG3("Boundary on '%c'. len=%d;option-name=%ld",
+             *option,len,(long)(option-name));
 
       /* Pass the following blank chars */
       *(option++)='\0';
-      while (option-name<(len-1) && 
-	     (*option == ' ' || *option == '\n' || *option == '\t')) {
-	/*      fprintf(stderr,"Ignore a blank char.\n");*/
-	option++;
+      while (option-name<(len-1) &&
+          (*option == ' ' || *option == '\n' || *option == '\t')) {
+        /*      fprintf(stderr,"Ignore a blank char.\n");*/
+        option++;
       }
       if (option-name == len-1)
-	option=NULL; /* don't do next iteration */
+        option=NULL; /* don't do next iteration */
     }
     DEBUG2("parse now:'%s'; parse later:'%s'",name,option);
 
@@ -563,107 +532,93 @@ xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
       continue;
     if (!strlen(name))
       break;
-    
+
     val=strchr(name,':');
     if (!val) {
       free(optionlist_cpy);
       xbt_assert1(FALSE,
-	     "Malformated option: '%s'; Should be of the form 'name:value'",
-		  name);
+                  "Option '%s' badly formated. Should be of the form 'name:value'",
+                  name);
     }
     *(val++)='\0';
 
     DEBUG2("name='%s';val='%s'",name,val);
 
-    errcode=xbt_dict_get((xbt_dict_t)cfg,name,(void**)&variable);
-    switch (errcode) {
-    case no_error:
-      break;
-    case mismatch_error:
-      ERROR1("No registrated variable corresponding to '%s'.",name);
-      free(optionlist_cpy);
-      return mismatch_error;
-      break;
-    default:
+    TRY {
+      variable = xbt_dict_get((xbt_dict_t)cfg,name);
+    } CATCH(e) {
+      /* put it back on what won't get freed, ie within "options" and out of "optionlist_cpy" */
+      name = (char*) (optionlist_cpy-name + options);
       free(optionlist_cpy);
-      return errcode;
-    }
-
-    switch (variable->type) {
-    case xbt_cfgelm_string:
-      errcode = xbt_cfg_set_string(cfg, name, val);
-      if (errcode != no_error) {
-	 free(optionlist_cpy);
-         return errcode;
-      }
-      break;
-
-    case xbt_cfgelm_int:
-      i=strtol(val, &val, 0);
-      if (val==NULL) {
-	free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-		     "Value of option %s not valid. Should be an integer",
-		     name);
-      }
-
-      errcode = xbt_cfg_set_int(cfg,name,i);
-      if (errcode != no_error) {
-	 free(optionlist_cpy);
-	 return errcode;
-      }
-      break;
-
-    case xbt_cfgelm_double:
-      d=strtod(val, &val);
-      if (val==NULL) {
-	free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	       "Value of option %s not valid. Should be a double",
-	       name);
-      }
-
-      errcode = xbt_cfg_set_double(cfg,name,d);
-      if (errcode != no_error) {
-	 free(optionlist_cpy);
-	 return errcode;
-      }
-      break;
-
-    case xbt_cfgelm_host:
-      str=val;
-      val=strchr(val,':');
-      if (!val) {
-	free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	    "Value of option %s not valid. Should be an host (machine:port)",
-	       name);
-      }
-
-      *(val++)='\0';
-      i=strtol(val, &val, 0);
-      if (val==NULL) {
-	free(optionlist_cpy);	
-	xbt_assert1(FALSE,
-	    "Value of option %s not valid. Should be an host (machine:port)",
-	       name);
+      if (e.category == not_found_error) {
+        xbt_ex_free(e);
+        THROW1(not_found_error,0,"No registrated variable corresponding to '%s'.",name);
       }
+      RETHROW;
+    }
 
-      errcode = xbt_cfg_set_host(cfg,name,str,i);
-      if (errcode != no_error) {
-	 free(optionlist_cpy);
-	 return errcode;
+    TRY {
+      switch (variable->type) {
+        case xbt_cfgelm_string:
+          xbt_cfg_set_string(cfg, name, val); /* throws */
+          break;
+
+        case xbt_cfgelm_int:
+          i=strtol(val, &val, 0);
+          if (val==NULL) {
+            free(optionlist_cpy);
+            xbt_assert1(FALSE,
+                        "Value of option %s not valid. Should be an integer",
+                        name);
+          }
+
+          xbt_cfg_set_int(cfg,name,i); /* throws */
+          break;
+
+        case xbt_cfgelm_double:
+          d=strtod(val, &val);
+          if (val==NULL) {
+            free(optionlist_cpy);
+            xbt_assert1(FALSE,
+                        "Value of option %s not valid. Should be a double",
+                        name);
+          }
+
+          xbt_cfg_set_double(cfg,name,d); /* throws */
+          break;
+
+        case xbt_cfgelm_peer:
+          str=val;
+          val=strchr(val,':');
+          if (!val) {
+            free(optionlist_cpy);
+            xbt_assert1(FALSE,
+                        "Value of option %s not valid. Should be an peer (machine:port)",
+                        name);
+          }
+
+          *(val++)='\0';
+          i=strtol(val, &val, 0);
+          if (val==NULL) {
+            free(optionlist_cpy);
+            xbt_assert1(FALSE,
+                        "Value of option %s not valid. Should be an peer (machine:port)",
+                        name);
+          }
+
+          xbt_cfg_set_peer(cfg,name,str,i); /* throws */
+          break;
+
+        default:
+          THROW1(unknown_error,0,"Type of config element %s is not valid.",name);
       }
-      break;      
-
-    default: 
+    } CATCH(e) {
       free(optionlist_cpy);
-      RAISE1(unknown_error,"Type of config element %s is not valid.",name);
+      RETHROW;
     }
-    
   }
   free(optionlist_cpy);
-  return no_error;
+
 }
 
 /** @brief Set or add an integer value to \a name within \a cfg
@@ -671,101 +626,142 @@ xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options) {
  * \arg cfg the config set
  * \arg name the name of the variable
  * \arg val the value of the variable
- */ 
-xbt_error_t
+ */
+void
 xbt_cfg_set_int(xbt_cfg_t cfg,const char*name, int val) {
   xbt_cfgelm_t variable;
-  xbt_error_t errcode;
 
   VERB2("Configuration setting: %s=%d",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&variable));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
 
-  if (variable->max > 1) {
-    xbt_dynar_push(variable->content,&val);
-  } else {
     xbt_dynar_set(variable->content,0,&val);
+  } else {
+    if (variable->max && xbt_dynar_length(variable->content) == (unsigned long)variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %d to the config element %s since it's already full (size=%d)",
+             val,name,variable->max);
+
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
 /** @brief Set or add a double value to \a name within \a cfg
- * 
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
  * \arg val the doule to set
- */ 
+ */
 
-xbt_error_t
+void
 xbt_cfg_set_double(xbt_cfg_t cfg,const char*name, double val) {
   xbt_cfgelm_t variable;
-  xbt_error_t errcode;
 
   VERB2("Configuration setting: %s=%f",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&variable));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
+
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
 
-  if (variable->max > 1) {
-    xbt_dynar_push(variable->content,&val);
-  } else {
     xbt_dynar_set(variable->content,0,&val);
+  } else {
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %f to the config element %s since it's already full (size=%d)",
+             val,name,variable->max);
+
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
 /** @brief Set or add a string value to \a name within \a cfg
- * 
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
  * \arg val the value to be added
  *
- */ 
+ */
 
-xbt_error_t
-xbt_cfg_set_string(xbt_cfg_t cfg,const char*name, const char*val) { 
+void
+xbt_cfg_set_string(xbt_cfg_t cfg,const char*name, const char*val) {
   xbt_cfgelm_t variable;
-  xbt_error_t errcode;
   char *newval = xbt_strdup(val);
 
   VERB2("Configuration setting: %s=%s",name,val);
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&variable));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
+  DEBUG5("Variable: %d to %d %s (=%d) @%p",
+         variable->min,variable->max,xbt_cfgelm_type_name[variable->type],variable->type,variable);
+
+  if (variable->max == 1) {
+    if (xbt_dynar_length(variable->content)) {
+      if (variable->cb_rm)
+        (*variable->cb_rm)(name, 0);
+      else if (variable->type == xbt_cfgelm_string) {
+        char * sval=xbt_dynar_get_as(variable->content,0,char*);
+        free(sval);
+      }
+    }
 
-  if (variable->max > 1) {
-    xbt_dynar_push(variable->content,&newval);
-  } else {
     xbt_dynar_set(variable->content,0,&newval);
+  } else {
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW3(mismatch_error,0,
+             "Cannot add value %s to the config element %s since it's already full (size=%d)",
+             name,val,variable->max);
+
+    xbt_dynar_push(variable->content,&newval);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
-/** @brief Set or add an host value to \a name within \a cfg
- * 
+/** @brief Set or add an peer value to \a name within \a cfg
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
- * \arg host the host
+ * \arg peer the peer
  * \arg port the port number
  *
- * \e host values are composed of a string (hostname) and an integer (port)
- */ 
+ * \e peer values are composed of a string (peername) and an integer (port)
+ */
 
-xbt_error_t 
-xbt_cfg_set_host(xbt_cfg_t cfg,const char*name, 
-		  const char *host,int port) {
+void
+xbt_cfg_set_peer(xbt_cfg_t cfg,const char*name,
+                 const char *peer,int port) {
   xbt_cfgelm_t variable;
-  xbt_error_t errcode;
-  xbt_host_t *val=xbt_new(xbt_host_t,1);
+  xbt_peer_t val=xbt_peer_new(peer,port);
 
-  VERB3("Configuration setting: %s=%s:%d",name,host,port);
+  VERB3("Configuration setting: %s=%s:%d",name,peer,port);
 
-  val->name = xbt_strdup(name);
-  val->port = port;
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_peer);
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&variable));
+  if (variable->max == 1) {
+    if (variable->cb_rm && xbt_dynar_length(variable->content))
+      (*variable->cb_rm)(name, 0);
 
-  if (variable->max > 1) {
-    xbt_dynar_push(variable->content,&val);
-  } else {
     xbt_dynar_set(variable->content,0,&val);
+  } else {
+    if (variable->max && xbt_dynar_length(variable->content) == variable->max)
+      THROW4(mismatch_error,0,
+             "Cannot add value %s:%d to the config element %s since it's already full (size=%d)",
+             peer,port,name,variable->max);
+
+    xbt_dynar_push(variable->content,&val);
   }
-  return no_error;
+
+  if (variable->cb_set)
+    (*variable->cb_set)(name, xbt_dynar_length(variable->content) -1);
 }
 
 /* ---- [ Removing ] ---- */
@@ -776,24 +772,29 @@ xbt_cfg_set_host(xbt_cfg_t cfg,const char*name,
  * \arg name the name of the variable
  * \arg val the value to be removed
  */
-xbt_error_t xbt_cfg_rm_int(xbt_cfg_t cfg,const char*name, int val) {
+void xbt_cfg_rm_int(xbt_cfg_t cfg,const char*name, int val) {
 
   xbt_cfgelm_t variable;
-  int cpt,seen;
-  xbt_error_t errcode;
+  unsigned int cpt;
+  int seen;
+
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %d from the config element %s since it's already at its minimal size (=%d)",
+           val,name,variable->min);
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&variable));
-  
   xbt_dynar_foreach(variable->content,cpt,seen) {
     if (seen == val) {
+      if (variable->cb_rm) (*variable->cb_rm)(name, cpt);
       xbt_dynar_cursor_rm(variable->content,&cpt);
-      return no_error;
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %d of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+         "Can't remove the value %d of config element %s: value not found.",val,name);
 }
 
 /** @brief Remove the provided \e val double value from a variable
@@ -803,24 +804,29 @@ xbt_error_t xbt_cfg_rm_int(xbt_cfg_t cfg,const char*name, int val) {
  * \arg val the value to be removed
  */
 
-xbt_error_t xbt_cfg_rm_double(xbt_cfg_t cfg,const char*name, double val) {
+void xbt_cfg_rm_double(xbt_cfg_t cfg,const char*name, double val) {
   xbt_cfgelm_t variable;
-  int cpt;
+  unsigned int cpt;
   double seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&variable));
-  
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
+
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %f from the config element %s since it's already at its minimal size (=%d)",
+           val,name,variable->min);
+
   xbt_dynar_foreach(variable->content,cpt,seen) {
     if (seen == val) {
       xbt_dynar_cursor_rm(variable->content,&cpt);
-      return no_error;
+      if (variable->cb_rm)
+        (*variable->cb_rm)(name, cpt);
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %f of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+         "Can't remove the value %f of config element %s: value not found.",val,name);
 }
 
 /** @brief Remove the provided \e val string value from a variable
@@ -829,80 +835,115 @@ xbt_error_t xbt_cfg_rm_double(xbt_cfg_t cfg,const char*name, double val) {
  * \arg name the name of the variable
  * \arg val the value of the string which will be removed
  */
-xbt_error_t
+void
 xbt_cfg_rm_string(xbt_cfg_t cfg,const char*name, const char *val) {
   xbt_cfgelm_t variable;
-  int cpt;
+  unsigned int cpt;
   char *seen;
-  xbt_error_t errcode;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&variable));
-  
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
+
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove value %s from the config element %s since it's already at its minimal size (=%d)",
+           name,val,variable->min);
+
   xbt_dynar_foreach(variable->content,cpt,seen) {
     if (!strcpy(seen,val)) {
+      if (variable->cb_rm)
+        (*variable->cb_rm)(name, cpt);
       xbt_dynar_cursor_rm(variable->content,&cpt);
-      return no_error;
+      return;
     }
   }
 
-  ERROR2("Can't remove the value %s of config element %s: value not found.",
-	 val,name);
-  return mismatch_error;
+  THROW2(not_found_error,0,
+         "Can't remove the value %s of config element %s: value not found.",val,name);
 }
 
-/** @brief Remove the provided \e val host value from a variable
- * 
+/** @brief Remove the provided \e val peer value from a variable
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
- * \arg host the hostname
+ * \arg peer the peername
  * \arg port the port number
  */
 
-xbt_error_t
-xbt_cfg_rm_host(xbt_cfg_t cfg,const char*name, const char *host,int port) {
+void
+xbt_cfg_rm_peer(xbt_cfg_t cfg,const char*name, const char *peer,int port) {
   xbt_cfgelm_t variable;
-  int cpt;
-  xbt_host_t *seen;
-  xbt_error_t errcode;
+  unsigned int cpt;
+  xbt_peer_t seen;
+
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_peer);
+
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW4(mismatch_error,0,
+           "Cannot remove value %s:%d from the config element %s since it's already at its minimal size (=%d)",
+           peer,port,name,variable->min);
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&variable));
-  
   xbt_dynar_foreach(variable->content,cpt,seen) {
-    if (!strcpy(seen->name,host) && seen->port == port) {
+    if (!strcpy(seen->name,peer) && seen->port == port) {
+      if (variable->cb_rm) (*variable->cb_rm)(name, cpt);
       xbt_dynar_cursor_rm(variable->content,&cpt);
-      return no_error;
+      return;
     }
   }
 
-  ERROR3("Can't remove the value %s:%d of config element %s: value not found.",
-	 host,port,name);
-  return mismatch_error;
+  THROW3(not_found_error,0,
+         "Can't remove the value %s:%d of config element %s: value not found.",
+         peer,port,name);
+}
+
+/** @brief Remove the \e pos th value from the provided variable */
+
+void xbt_cfg_rm_at   (xbt_cfg_t cfg, const char *name, int pos) {
+
+  xbt_cfgelm_t variable;
+
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_any);
+
+  if (xbt_dynar_length(variable->content) == variable->min)
+    THROW3(mismatch_error,0,
+           "Cannot remove %dth value from the config element %s since it's already at its minimal size (=%d)",
+           pos,name,variable->min);
+
+  if (variable->cb_rm) (*variable->cb_rm)(name, pos);
+  xbt_dynar_remove_at(variable->content, pos, NULL);
 }
 
 /** @brief Remove all the values from a variable
- * 
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
  */
 
-xbt_error_t 
+void
 xbt_cfg_empty(xbt_cfg_t cfg,const char*name) {
-  xbt_cfgelm_t variable;
+  xbt_cfgelm_t variable=NULL;
+  xbt_ex_t e;
 
-  xbt_error_t errcode;
+  TRY {
+    variable = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category != not_found_error)
+      RETHROW;
 
-  TRYCATCH(mismatch_error,
-	   xbt_dict_get((xbt_dict_t)cfg,name,(void**)&variable));
-  if (errcode == mismatch_error) {
-    ERROR1("Can't empty  '%s' since this config element does not exist",
-	   name);
-    return mismatch_error;
+    xbt_ex_free(e);
+    THROW1(not_found_error,0,
+           "Can't empty  '%s' since this config element does not exist", name);
   }
 
   if (variable) {
+    if (variable->cb_rm) {
+      unsigned int cpt;
+      void *ignored;
+      xbt_dynar_foreach(variable->content,cpt,ignored) {
+        (*variable->cb_rm)(name, cpt);
+      }
+    }
     xbt_dynar_reset(variable->content);
   }
-  return no_error;
 }
 
 /*----[ Getting ]---------------------------------------------------------*/
@@ -914,58 +955,46 @@ xbt_cfg_empty(xbt_cfg_t cfg,const char*name) {
  * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using 
+ * If there is more than one value, it will issue a warning. Consider using
  * xbt_cfg_get_dynar() instead.
  *
  * \warning the returned value is the actual content of the config set
  */
-xbt_error_t
-xbt_cfg_get_int   (xbt_cfg_t  cfg,
-		    const char *name,
-		    int        *val) {
-  xbt_cfgelm_t variable;
-  xbt_error_t errcode;
-
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_int,&variable));
+int
+xbt_cfg_get_int (xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
 
   if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values",
-	     name, xbt_dynar_length(variable->content));
+          name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(variable->content, 0, int);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, int);
 }
 
 /** @brief Retrieve a double value of a variable (get a warning if not uniq)
- * 
+ *
  * \arg cfg the config set
  * \arg name the name of the variable
  * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using 
+ * If there is more than one value, it will issue a warning. Consider using
  * xbt_cfg_get_dynar() instead.
  *
  * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t
-xbt_cfg_get_double(xbt_cfg_t  cfg,
-		    const char *name,
-		    double     *val) {
-  xbt_cfgelm_t variable;
-  xbt_error_t  errcode;
-
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_double,&variable));
+double
+xbt_cfg_get_double(xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
 
   if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(variable->content));
+          name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(variable->content, 0, double);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, double);
 }
 
 /** @brief Retrieve a string value of a variable (get a warning if not uniq)
@@ -975,36 +1004,28 @@ xbt_cfg_get_double(xbt_cfg_t  cfg,
  * \arg val the wanted value
  *
  * Returns the first value from the config set under the given name.
- * If there is more than one value, it will issue a warning. Consider using 
+ * If there is more than one value, it will issue a warning. Consider using
  * xbt_cfg_get_dynar() instead.
  *
  * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t xbt_cfg_get_string(xbt_cfg_t  cfg,
-				 const char *name,
-				 char      **val) {
-  xbt_cfgelm_t  variable;
-  xbt_error_t errcode;
-
-  *val=NULL;
-
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_string,&variable));
+char* xbt_cfg_get_string(xbt_cfg_t  cfg, const char *name) {
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
 
   if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(variable->content));
+          name, xbt_dynar_length(variable->content));
   }
 
-  *val = xbt_dynar_get_as(variable->content, 0, char *);
-  return no_error;
+  return xbt_dynar_get_as(variable->content, 0, char *);
 }
 
-/** @brief Retrieve an host value of a variable (get a warning if not uniq)
+/** @brief Retrieve an peer value of a variable (get a warning if not uniq)
  *
  * \arg cfg the config set
  * \arg name the name of the variable
- * \arg host the host
+ * \arg peer the peer
  * \arg port the port number
  *
  * Returns the first value from the config set under the given name.
@@ -1014,54 +1035,206 @@ xbt_error_t xbt_cfg_get_string(xbt_cfg_t  cfg,
  * \warning the returned value is the actual content of the config set
  */
 
-xbt_error_t xbt_cfg_get_host  (xbt_cfg_t  cfg,
-				 const char *name,
-				 char      **host,
-				 int        *port) {
+void xbt_cfg_get_peer  (xbt_cfg_t   cfg,  const char *name,
+                        char      **peer, int        *port) {
   xbt_cfgelm_t variable;
-  xbt_error_t  errcode;
-  xbt_host_t  *val;
+  xbt_peer_t  val;
 
-  TRY (xbt_cfgelm_get(cfg,name,xbt_cfgelm_host,&variable));
+  variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_peer);
 
   if (xbt_dynar_length(variable->content) > 1) {
     WARN2("You asked for the first value of the config element '%s', but there is %lu values\n",
-	     name, xbt_dynar_length(variable->content));
+          name, xbt_dynar_length(variable->content));
   }
 
-  val = xbt_dynar_get_as(variable->content, 0, xbt_host_t*);
-  *host=val->name;
+  val = xbt_dynar_get_as(variable->content, 0, xbt_peer_t);
+  *peer=val->name;
   *port=val->port;
-  
-  return no_error;
 }
 
 /** @brief Retrieve the dynar of all the values stored in a variable
- * 
+ *
  * \arg cfg where to search in
  * \arg name what to search for
  * \arg dynar result
  *
- * Get the data stored in the config set. 
+ * Get the data stored in the config set.
  *
  * \warning the returned value is the actual content of the config set
  */
-xbt_error_t xbt_cfg_get_dynar (xbt_cfg_t    cfg,
-				 const char   *name,
-				 xbt_dynar_t *dynar) {
-  xbt_cfgelm_t variable;
-  xbt_error_t  errcode = xbt_dict_get((xbt_dict_t)cfg,name,
-					(void**)&variable);
+xbt_dynar_t xbt_cfg_get_dynar (xbt_cfg_t    cfg, const char *name) {
+  xbt_cfgelm_t variable=NULL;
+  xbt_ex_t     e;
+
+  TRY {
+    variable = xbt_dict_get((xbt_dict_t)cfg,name);
+  } CATCH(e) {
+    if (e.category == not_found_error) {
+      xbt_ex_free(e);
+      THROW1(not_found_error,0,
+             "No registered variable %s in this config set",name);
+    }
+    RETHROW;
+  }
+
+  return variable->content;
+}
+
+
+/** @brief Retrieve one of the integer value of a variable */
+int
+xbt_cfg_get_int_at(xbt_cfg_t cfg, const char *name, int pos) {
+
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+  return xbt_dynar_get_as(variable->content, pos, int);
+}
+
+/** @brief Retrieve one of the double value of a variable */
+double
+xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name, int pos) {
+
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_double);
+  return xbt_dynar_get_as(variable->content, pos, double);
+}
+
+
+/** @brief Retrieve one of the string value of a variable */
+char*
+xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name, int pos) {
+
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_string);
+  return xbt_dynar_get_as(variable->content, pos, char*);
+}
+
+/** @brief Retrieve one of the peer value of a variable */
+void
+xbt_cfg_get_peer_at(xbt_cfg_t cfg, const char *name, int pos,
+                    char **peer, int *port) {
 
-  if (errcode == mismatch_error) {
-    ERROR1("No registered variable %s in this config set",
-	   name);
-    return mismatch_error;
+  xbt_cfgelm_t variable = xbt_cfgelm_get(cfg,name,xbt_cfgelm_int);
+  xbt_peer_t val = xbt_dynar_get_ptr(variable->content, pos);
+
+  *port = val->port;
+  *peer = val->name;
+}
+
+
+#ifdef SIMGRID_TEST
+#include "xbt.h"
+#include "xbt/ex.h"
+
+XBT_TEST_SUITE("config","Configuration support");
+
+static xbt_cfg_t make_set(){
+  xbt_cfg_t set=NULL;
+
+  set = xbt_cfg_new();
+  xbt_cfg_register_str(set,"speed:1_to_2_int");
+  xbt_cfg_register_str(set,"peername:1_to_1_string");
+  xbt_cfg_register_str(set,"user:1_to_10_string");
+
+  return set;
+} /* end_of_make_set */
+
+XBT_TEST_UNIT("memuse",test_config_memuse,"Alloc and free a config set") {
+  xbt_cfg_t set=make_set();
+  xbt_test_add0("Alloc and free a config set");
+  xbt_cfg_set_parse(set, "peername:veloce user:mquinson\nuser:oaumage\tuser:alegrand");
+  xbt_cfg_free(&set);
+  xbt_cfg_free(&set);
+}
+
+XBT_TEST_UNIT("validation",test_config_validation,"Validation tests") {
+  xbt_cfg_t set = set=make_set();
+  xbt_ex_t e;
+
+  xbt_test_add0("Having too few elements for speed");
+  xbt_cfg_set_parse(set, "peername:veloce user:mquinson\nuser:oaumage\tuser:alegrand");
+  TRY {
+    xbt_cfg_check(set);
+  } CATCH(e) {
+    if (e.category != mismatch_error ||
+        strncmp(e.msg,"Config elem speed needs",strlen("Config elem speed needs")))
+      xbt_test_fail1("Got an exception. msg=%s",e.msg);
+    xbt_ex_free(e);
+  }
+  xbt_cfg_free(&set);
+  xbt_cfg_free(&set);
+
+
+
+  xbt_test_add0("Having too much values of 'speed'");
+  set=make_set();
+  xbt_cfg_set_parse(set,"peername:toto:42 user:alegrand");
+  TRY {
+    xbt_cfg_set_parse(set,"speed:42 speed:24 speed:34");
+  } CATCH(e) {
+    if (e.category != mismatch_error ||
+        strncmp(e.msg,"Cannot add value 34 to the config elem speed",
+                strlen("Config elem speed needs")))
+      xbt_test_fail1("Got an exception. msg=%s",e.msg);
+    xbt_ex_free(e);
   }
-  if (errcode != no_error)
-     return errcode;
+  xbt_cfg_check(set);
+  xbt_cfg_free(&set);
+  xbt_cfg_free(&set);
 
-  *dynar = variable->content;
-  return no_error;
 }
 
+XBT_TEST_UNIT("use",test_config_use,"Data retrieving tests") {
+
+  xbt_test_add0("Get a single value");
+  {
+    /* get_single_value */
+    int ival;
+    xbt_cfg_t myset=make_set();
+
+    xbt_cfg_set_parse(myset,"peername:toto:42 speed:42");
+    ival = xbt_cfg_get_int(myset,"speed");
+    if (ival != 42)
+      xbt_test_fail1("Speed value = %d, I expected 42",ival);
+    xbt_cfg_free(&myset);
+  }
+
+  xbt_test_add0("Get multiple values");
+  {
+    /* get_multiple_value */
+    xbt_dynar_t dyn;
+    xbt_cfg_t myset=make_set();
+
+    xbt_cfg_set_parse(myset, "peername:veloce user:foo\nuser:bar\tuser:toto");
+    xbt_cfg_set_parse(myset,"speed:42");
+    xbt_cfg_check(myset);
+    dyn = xbt_cfg_get_dynar(myset,"user");
+
+    if (xbt_dynar_length(dyn) != 3)
+      xbt_test_fail1("Dynar length = %lu, I expected 3", xbt_dynar_length(dyn));
+
+    if (strcmp(xbt_dynar_get_as(dyn,0,char*),"foo"))
+      xbt_test_fail1("Dynar[0] = %s, I expected foo",   xbt_dynar_get_as(dyn,0,char*));
+
+    if (strcmp(xbt_dynar_get_as(dyn,1,char*),"bar"))
+      xbt_test_fail1("Dynar[1] = %s, I expected bar",   xbt_dynar_get_as(dyn,1,char*));
+
+    if (strcmp(xbt_dynar_get_as(dyn,2,char*),"toto"))
+      xbt_test_fail1("Dynar[2] = %s, I expected toto",  xbt_dynar_get_as(dyn,2,char*));
+    xbt_cfg_free(&myset);
+  }
+
+  xbt_test_add0("Access to a non-existant entry");
+  {
+    /* non-existant_entry */
+    xbt_cfg_t myset=make_set();
+    xbt_ex_t e;
+
+    TRY {
+      xbt_cfg_set_parse(myset, "color:blue");
+    } CATCH(e) {
+      if (e.category != not_found_error)
+        xbt_test_exception(e);
+      xbt_ex_free(e);
+    }
+    xbt_cfg_free(&myset);
+  }
+}
+#endif /* SIMGRID_TEST */