X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0ca1291c2f63ca6235f4b4885c48413a900aade4..bca294b697ffe5980a5d6aea3a3ed2d9a1f8a568:/src/xbt/fifo.c

diff --git a/src/xbt/fifo.c b/src/xbt/fifo.c
index 89ab25fa12..841aebec31 100644
--- a/src/xbt/fifo.c
+++ b/src/xbt/fifo.c
@@ -13,7 +13,7 @@
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_fifo, xbt, "FIFO");
 
 static void *fifo_item_mallocator_new_f(void);
-static void fifo_item_mallocator_free_f(void *item);
+#define fifo_item_mallocator_free_f xbt_free_f
 static void fifo_item_mallocator_reset_f(void *item);
 
 static xbt_mallocator_t item_mallocator = NULL;
@@ -331,6 +331,42 @@ int xbt_fifo_is_in(xbt_fifo_t f, void *content)
   return 0;
 }
 
+/**
+ * @brief Search the given element in the fifo using a comparison function
+ *
+ * This function allows to search an item with a user provided function instead
+ * of the pointer comparison used elsewhere in this module. Assume for example that you have a fifo of
+ * strings. You cannot use xbt_fifo_remove() to remove, say, "TOTO" from it because internally, xbt_fifo_remove()
+ * will do something like "if (item->content == "toto"), then remove it". And the pointer to the item content
+ * and the pointer to "toto" will never match. As a solution, the current function provides a way to search elements
+ * that are semanticaly equivalent instead of only syntaxically. So, removing "Toto" from a fifo can be
+ * achieved this way:
+ *
+ *  @verbatim
+int my_comparison_function(void *searched, void *seen) {
+  return !strcmp(searched, seen);
+}
+
+  xbt_fifo_remove_item(fifo,
+                       xbt_fifo_search_item(fifo, my_comparison_function, "Toto"));
+@endverbatim
+ *
+ * \param f a fifo list
+ * \param cmp_fun the comparison function. Prototype: void *a,void *b -> int. Semantic: returns true iff a=b
+ * @param closure the element to search. It will be provided as first argument to each call of cmp_fun
+ * \return the first item matching the comparison function, or NULL if no such item exists
+ */
+xbt_fifo_item_t xbt_fifo_search_item(xbt_fifo_t f, int_f_pvoid_pvoid_t cmp_fun, void *closure) {
+  xbt_fifo_item_t item = xbt_fifo_get_first_item(f);
+  while (item) {
+    if (cmp_fun(closure, item->content))
+      return item;
+    item = item->next;
+  }
+  return NULL;
+
+}
+
 /**
  * \param f a list
  * \return a table with the objects stored in \a f.
@@ -375,11 +411,6 @@ static void *fifo_item_mallocator_new_f(void)
   return xbt_new(s_xbt_fifo_item_t, 1);
 }
 
-static void fifo_item_mallocator_free_f(void *item)
-{
-  xbt_free(item);
-}
-
 static void fifo_item_mallocator_reset_f(void *item)
 {
   /* memset to zero like calloc */
@@ -455,6 +486,8 @@ XBT_INLINE int xbt_fifo_size(xbt_fifo_t f)
 /**
  * \param l a list
  * \return the head of \a l.
+ *
+ * Returns NULL if the list is empty.
  */
 XBT_INLINE xbt_fifo_item_t xbt_fifo_get_first_item(xbt_fifo_t l)
 {
@@ -464,6 +497,8 @@ XBT_INLINE xbt_fifo_item_t xbt_fifo_get_first_item(xbt_fifo_t l)
 /**
  * \param l a list
  * \return the tail of \a l.
+ *
+ * Returns NULL if the list is empty.
  */
 XBT_INLINE xbt_fifo_item_t xbt_fifo_get_last_item(xbt_fifo_t l)
 {
@@ -481,6 +516,8 @@ XBT_INLINE xbt_fifo_item_t xbt_fifo_getFirstItem(xbt_fifo_t l)
 /**
  * \param i a bucket
  * \return the bucket that comes next
+ *
+ * Returns NULL if \a i is the tail of the list.
  */
 XBT_INLINE xbt_fifo_item_t xbt_fifo_get_next_item(xbt_fifo_item_t i)
 {
@@ -500,6 +537,8 @@ xbt_fifo_item_t xbt_fifo_getNextItem(xbt_fifo_item_t i)
 /**
  * \param i a bucket
  * \return the bucket that is just before \a i.
+ *
+ * Returns NULL if \a i is the head of the list.
  */
 XBT_INLINE xbt_fifo_item_t xbt_fifo_get_prev_item(xbt_fifo_item_t i)
 {
@@ -522,11 +561,6 @@ xbt_fifo_item_t xbt_fifo_getPrevItem(xbt_fifo_item_t i)
  */
 void xbt_fifo_preinit(void)
 {
-  if (item_mallocator != NULL) {
-    /* Already created. I guess we want to switch to MC mode, so kill the previously created mallocator */
-    xbt_mallocator_free(item_mallocator);
-  }
-
   item_mallocator = xbt_mallocator_new(65536,
                                        fifo_item_mallocator_new_f,
                                        fifo_item_mallocator_free_f,