X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/8a2fdf3f7d711438dfbb61e24fcf06897fba6243..7f379953cbe4a9a5b60472c218a6189d523856cd:/src/xbt/swag.c

diff --git a/src/xbt/swag.c b/src/xbt/swag.c
index f6a8491d95..c9730dee16 100644
--- a/src/xbt/swag.c
+++ b/src/xbt/swag.c
@@ -1,7 +1,9 @@
-/* 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. */
 
 /* Warning, this module is done to be efficient and performs tons of
    cast and dirty things. So avoid using it unless you really know
@@ -13,22 +15,30 @@
 #include "xbt/error.h"
 #include "xbt/swag.h"
 
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(swag,xbt,"Swag : O(1) set library");
+
 #define PREV(obj,offset) xbt_swag_getPrev(obj,offset)
 #define NEXT(obj,offset) xbt_swag_getNext(obj,offset)
 
 /*
-  Usage : xbt_swag_new(&obj.setA-&obj.setA);
+  Usage : xbt_swag_new(&obj.setA-&obj);
  */
 
 xbt_swag_t xbt_swag_new(size_t offset)
 {
-  xbt_swag_t swag = xbt_new0(s_xbt_swag_t,1);
+  xbt_swag_t swag = xbt_new0(s_xbt_swag_t, 1);
 
   swag->offset = offset;
 
   return swag;
 }
 
+
+void xbt_swag_free(xbt_swag_t swag)
+{
+  xbt_free(swag);
+}
+
 void xbt_swag_init(xbt_swag_t swag, size_t offset)
 {
   swag->offset = offset;
@@ -37,8 +47,47 @@ void xbt_swag_init(xbt_swag_t swag, size_t offset)
 void xbt_swag_insert(void *obj, xbt_swag_t swag)
 {
 
-  if(xbt_swag_belongs(obj, swag)) return;
-  
+  if (xbt_swag_belongs(obj, swag))
+    return;
+
+  (swag->count)++;
+  if (swag->head == NULL) {
+    swag->head = obj;
+    swag->tail = obj;
+    return;
+  }
+
+  PREV(obj, swag->offset) = swag->tail;
+  NEXT(PREV(obj, swag->offset), swag->offset) = obj;
+
+  swag->tail = obj;
+}
+
+void xbt_swag_insert_at_head(void *obj, xbt_swag_t swag)
+{
+
+  if (xbt_swag_belongs(obj, swag))
+    return;
+
+  (swag->count)++;
+  if (swag->head == NULL) {
+    swag->head = obj;
+    swag->tail = obj;
+    return;
+  }
+
+  NEXT(obj, swag->offset) = swag->head;
+  PREV(NEXT(obj, swag->offset), swag->offset) = obj;
+
+  swag->head = obj;
+}
+
+void xbt_swag_insert_at_tail(void *obj, xbt_swag_t swag)
+{
+
+  if (xbt_swag_belongs(obj, swag))
+    return;
+
   (swag->count)++;
   if (swag->head == NULL) {
     swag->head = obj;
@@ -52,13 +101,18 @@ void xbt_swag_insert(void *obj, xbt_swag_t swag)
   swag->tail = obj;
 }
 
-void *xbt_swag_extract(void *obj, xbt_swag_t swag)
+void *xbt_swag_remove(void *obj, xbt_swag_t swag)
 {
   size_t offset = swag->offset;
 
-  if (!obj) return NULL;
+  if ((!obj) || (!swag))
+    return NULL;
+  if(!xbt_swag_belongs(obj, swag)) /* Trying to remove an object that
+				      was not in this swag */
+      return NULL;
+
   if (swag->head == swag->tail) {	/* special case */
-    if (swag->head != obj) /* Trying to remove an object that was not in this swag */
+    if (swag->head != obj)	/* Trying to remove an object that was not in this swag */
       return NULL;
     swag->head = NULL;
     swag->tail = NULL;
@@ -79,6 +133,28 @@ void *xbt_swag_extract(void *obj, xbt_swag_t swag)
   return obj;
 }
 
+void *xbt_swag_extract(xbt_swag_t swag)
+{
+  size_t offset = swag->offset;
+  void *obj = NULL;
+
+  if ((!swag) || (!(swag->head)))
+    return NULL;
+
+  obj = swag->head;
+
+  if (swag->head == swag->tail) {	/* special case */
+    swag->head = swag->tail = NULL;
+  } else {
+    swag->head = NEXT(obj, offset);
+    PREV(swag->head, offset) = NULL;
+    NEXT(obj, offset) = NULL;
+  }
+  (swag->count)--;
+
+  return obj;
+}
+
 int xbt_swag_size(xbt_swag_t swag)
 {
   return (swag->count);
@@ -86,5 +162,6 @@ int xbt_swag_size(xbt_swag_t swag)
 
 int xbt_swag_belongs(void *obj, xbt_swag_t swag)
 {
-  return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset)) || (swag->head==obj));
+  return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset))
+	  || (swag->head == obj));
 }