X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/91f0f8acd7bb93039252812ab45521b948ff50f4..12bd9c96c1d310b97f7827e13a8bb0cf8d72124d:/src/xbt/swag.c

diff --git a/src/xbt/swag.c b/src/xbt/swag.c
index 42e70fd10d..1a75c7f93d 100644
--- a/src/xbt/swag.c
+++ b/src/xbt/swag.c
@@ -1,7 +1,8 @@
-/* Authors: Arnaud Legrand                                                  */
+/* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
+ * 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
@@ -10,88 +11,242 @@
 /* This type should be added to a type that is to be used in such a swag */
 
 #include "xbt/sysdep.h"
-#include "xbt/error.h"
+#include "xbt/log.h"
 #include "xbt/swag.h"
 
-#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);
+/** Creates a new swag.
+ * \param offset where the hookup is located in the structure
+ * \see xbt_swag_offset
+ *
+ * Usage : xbt_swag_new(&obj.setA-&obj);
  */
-
-xbt_swag_t xbt_swag_new(size_t offset)
+XBT_INLINE xbt_swag_t xbt_swag_new(size_t offset)
 {
   xbt_swag_t swag = xbt_new0(s_xbt_swag_t, 1);
 
-  swag->offset = offset;
+  xbt_swag_init(swag, offset);
 
   return swag;
 }
 
-void xbt_swag_init(xbt_swag_t swag, size_t offset)
+/**
+ * \param swag poor victim
+ *
+ * kilkil a swag but not it's content. If you do not understand why
+ * xbt_swag_free should not free its content, don't use swags.
+ */
+XBT_INLINE void xbt_swag_free(xbt_swag_t swag)
 {
-  swag->offset = offset;
+  free(swag);
 }
 
-void xbt_swag_insert(void *obj, xbt_swag_t swag)
+/** Creates a new swag.
+ * \param swag the swag to initialize
+ * \param offset where the hookup is located in the structure
+ * \see xbt_swag_offset
+ *
+ * Usage : xbt_swag_init(swag,&obj.setA-&obj);
+ */
+XBT_INLINE void xbt_swag_init(xbt_swag_t swag, size_t offset)
 {
+  swag->tail = NULL;
+  swag->head = NULL;
+  swag->offset = offset;
+  swag->count = 0;
+}
 
-  if (xbt_swag_belongs(obj, swag))
-    return;
+/**
+ * \param obj the objet to insert in the swag
+ * \param swag a swag
+ *
+ * insert (at the head... you probably had a very good reason to do
+ * that, I hope you know what you're doing) \a obj in \a swag
+ */
+XBT_INLINE void xbt_swag_insert_at_head(void *obj, xbt_swag_t swag)
+{
+  xbt_assert(!xbt_swag_belongs(obj, swag) || swag->tail,
+      "This object belongs to an empty swag! Did you correctly initialize the object's hookup?");
 
-  (swag->count)++;
-  if (swag->head == NULL) {
+  if (!swag->head) {
+    xbt_assert(!(swag->tail), "Inconsistent swag.");
     swag->head = obj;
     swag->tail = obj;
-    return;
+    swag->count++;
+  }
+  else if (obj != swag->head && !xbt_swag_getPrev(obj, swag->offset)) {
+    xbt_swag_getNext(obj, swag->offset) = swag->head;
+    xbt_swag_getPrev(swag->head, swag->offset) = obj;
+    swag->head = obj;
+    swag->count++;
   }
+}
 
-  PREV(obj, swag->offset) = swag->tail;
-  NEXT(PREV(obj, swag->offset), swag->offset) = obj;
+/**
+ * \param obj the objet to insert in the swag
+ * \param swag a swag
+ *
+ * insert (at the tail... you probably had a very good reason to do
+ * that, I hope you know what you're doing) \a obj in \a swag
+ */
+XBT_INLINE void xbt_swag_insert_at_tail(void *obj, xbt_swag_t swag)
+{
+  xbt_assert(!xbt_swag_belongs(obj, swag) || swag->tail,
+      "This object belongs to an empty swag! Did you correctly initialize the object's hookup?");
 
-  swag->tail = obj;
+  if (!swag->head) {
+    xbt_assert(!(swag->tail), "Inconsistent swag.");
+    swag->head = obj;
+    swag->tail = obj;
+    swag->count++;
+  }
+  else if (obj != swag->tail && !xbt_swag_getNext(obj, swag->offset)) {
+    xbt_swag_getPrev(obj, swag->offset) = swag->tail;
+    xbt_swag_getNext(swag->tail, swag->offset) = obj;
+    swag->tail = obj;
+    swag->count++;
+  }
 }
 
-void *xbt_swag_extract(void *obj, xbt_swag_t swag)
+/**
+ * \param obj the objet to remove from the swag
+ * \param swag a swag
+ * \return \a obj if it was in the \a swag and NULL otherwise
+ *
+ * removes \a obj from \a swag
+ */
+XBT_INLINE void *xbt_swag_remove(void *obj, xbt_swag_t swag)
 {
+  if (!obj)
+    return NULL;
+
   size_t offset = swag->offset;
+  void* prev = xbt_swag_getPrev(obj, offset);
+  void* next = xbt_swag_getNext(obj, offset);
+
+  if (prev) {
+    xbt_swag_getNext(prev, offset) = next;
+    xbt_swag_getPrev(obj, offset) = NULL;
+    if (next) {
+      xbt_swag_getPrev(next, offset) = prev;
+      xbt_swag_getNext(obj, offset) = NULL;
+    }
+    else {
+      swag->tail = prev;
+    }
+    swag->count--;
+  }
+  else if (next) {
+    xbt_swag_getPrev(next, offset) = NULL;
+    xbt_swag_getNext(obj, offset) = NULL;
+    swag->head = next;
+    swag->count--;
+  }
+  else if (obj == swag->head) {
+    swag->head = swag->tail = NULL;
+    swag->count--;
+  }
+
+  return obj;
+}
 
-  if ((!obj) || (!swag))
+/**
+ * \param swag a swag
+ * \return an object from the \a swag
+ */
+void *xbt_swag_extract(xbt_swag_t swag)
+{
+  if (!swag->head)
     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 */
-      return NULL;
-    swag->head = NULL;
-    swag->tail = NULL;
-  } else if (obj == swag->head) {	/* It's the head */
-    swag->head = NEXT(obj, offset);
-    PREV(swag->head, offset) = NULL;
-    NEXT(obj, offset) = NULL;
-  } else if (obj == swag->tail) {	/* It's the tail */
-    swag->tail = PREV(obj, offset);
-    NEXT(swag->tail, offset) = NULL;
-    PREV(obj, offset) = NULL;
-  } else {			/* It's in the middle */
-    NEXT(PREV(obj, offset), offset) = NEXT(obj, offset);
-    PREV(NEXT(obj, offset), offset) = PREV(obj, offset);
-    PREV(obj, offset) = NEXT(obj, offset) = NULL;
+
+  size_t offset = swag->offset;
+  void* obj = swag->head;
+
+  if (obj == swag->tail) {       /* special case */
+    swag->head = swag->tail = NULL;
+  } else {
+    swag->head = xbt_swag_getNext(obj, offset);
+    xbt_swag_getPrev(swag->head, offset) = NULL;
+    xbt_swag_getNext(obj, offset) = NULL;
   }
   (swag->count)--;
+
   return obj;
 }
 
-int xbt_swag_size(xbt_swag_t swag)
+/**
+ * \param swag a swag
+ * \return the number of objects in \a swag
+ */
+XBT_INLINE int xbt_swag_size(xbt_swag_t swag)
 {
   return (swag->count);
 }
 
-int xbt_swag_belongs(void *obj, xbt_swag_t swag)
+
+#ifdef SIMGRID_TEST
+
+XBT_TEST_SUITE("swag", "Swag data container");
+
+typedef struct {
+  s_xbt_swag_hookup_t setA;
+  s_xbt_swag_hookup_t setB;
+  const char *name;
+} shmurtz, s_shmurtz_t, *shmurtz_t;
+
+
+XBT_TEST_UNIT("basic", test_swag_basic, "Basic usage")
 {
-  return ((NEXT(obj, swag->offset)) || (PREV(obj, swag->offset))
-	  || (swag->head == obj));
+  shmurtz_t obj1, obj2, obj;
+  xbt_swag_t setA, setB;
+
+  obj1 = xbt_new0(s_shmurtz_t, 1);
+  obj2 = xbt_new0(s_shmurtz_t, 1);
+
+  obj1->name = "Obj 1";
+  obj2->name = "Obj 2";
+
+  xbt_test_add("Basic usage");
+  xbt_test_log("%p %p %ld\n", obj1, &(obj1->setB),
+                (long) ((char *) &(obj1->setB) - (char *) obj1));
+
+  setA = xbt_swag_new(xbt_swag_offset(*obj1, setA));
+  setB = xbt_swag_new(xbt_swag_offset(*obj1, setB));
+
+  xbt_swag_insert(obj1, setA);
+  xbt_swag_insert(obj1, setB);
+  xbt_swag_insert(obj2, setA);
+  xbt_swag_insert(obj2, setB);
+
+  xbt_test_assert(xbt_swag_remove(NULL, setB) == NULL);
+  xbt_test_assert(xbt_swag_remove(obj1, setB) == obj1);
+  /*  xbt_test_assert(xbt_swag_remove(obj2, setB) == obj2); */
+
+  xbt_test_add("Traverse set A");
+  xbt_swag_foreach(obj, setA) {
+    xbt_test_log("Saw: %s", obj->name);
+  }
+
+  xbt_test_add("Traverse set B");
+  xbt_swag_foreach(obj, setB) {
+    xbt_test_log("Saw: %s", obj->name);
+  }
+
+  xbt_test_add("Ensure set content and length");
+  xbt_test_assert(xbt_swag_belongs(obj1, setA));
+  xbt_test_assert(xbt_swag_belongs(obj2, setA));
+
+  xbt_test_assert(!xbt_swag_belongs(obj1, setB));
+  xbt_test_assert(xbt_swag_belongs(obj2, setB));
+
+  xbt_test_assert(xbt_swag_size(setA) == 2);
+  xbt_test_assert(xbt_swag_size(setB) == 1);
+
+  xbt_swag_free(setA);
+  xbt_swag_free(setB);
+
+  xbt_free(obj1);
+  xbt_free(obj2);
 }
+
+#endif                          /* SIMGRID_TEST */