-/* 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. */
#include "xbt/sysdep.h"
-#include "xbt/error.h"
+#include "xbt/log.h"
+#include "xbt/mallocator.h"
#include "fifo_private.h"
+#include "xbt_modinter.h"
-/*
- * xbt_fifo_new()
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_fifo, xbt, "FIFO");
+
+static void *fifo_item_mallocator_new_f(void);
+#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;
+
+/** Constructor
+ * \return a new fifo
*/
xbt_fifo_t xbt_fifo_new(void)
{
xbt_fifo_t fifo;
- fifo = xbt_new0(struct xbt_fifo,1);
+ fifo = xbt_new0(struct xbt_fifo, 1);
+
return fifo;
}
-/*
- * xbt_fifo_free()
+
+/** Destructor
+ * \param l poor victim
+ *
+ * Free the fifo structure. None of the objects that was in the fifo is however modified.
*/
void xbt_fifo_free(xbt_fifo_t l)
+{
+ xbt_fifo_reset(l);
+ xbt_free(l);
+}
+
+/**
+ * \brief Makes a fifo empty.
+ * \param l a fifo
+ *
+ * None of the objects that was in the fifo is however modified.
+ */
+void xbt_fifo_reset(xbt_fifo_t l)
{
xbt_fifo_item_t b, tmp;
- for (b = xbt_fifo_getFirstitem(l); b;
- tmp = b, b = b->next, xbt_fifo_freeitem(tmp));
- free(l);
- return;
+ for (b = xbt_fifo_get_first_item(l); b;
+ tmp = b, b = b->next, xbt_fifo_free_item(tmp));
+ l->head = l->tail = NULL;
}
-/*
- * xbt_fifo_push()
- * at the tail
+/** Push
+ * \param l list
+ * \param t element
+ * \return the bucket that was just added
+ *
+ * Add an object at the tail of the list
*/
xbt_fifo_item_t xbt_fifo_push(xbt_fifo_t l, void *t)
{
xbt_fifo_item_t new;
- new = xbt_fifo_newitem();
+ new = xbt_fifo_new_item();
new->content = t;
- xbt_fifo_push_item(l,new);
+ xbt_fifo_push_item(l, new);
return new;
}
-/*
- * xbt_fifo_pop()
- * from the tail
+/** Pop
+ * \param l list
+ * \returns the object stored at the tail of the list.
+ *
+ * Removes and returns the object stored at the tail of the list.
+ * Returns NULL if the list is empty.
*/
void *xbt_fifo_pop(xbt_fifo_t l)
{
xbt_fifo_item_t item;
void *content;
- item = xbt_fifo_pop_item(l);
- if(item==NULL) return NULL;
+ if (l == NULL)
+ return NULL;
+ if (!(item = xbt_fifo_pop_item(l)))
+ return NULL;
content = item->content;
- xbt_fifo_freeitem(item);
+ xbt_fifo_free_item(item);
return content;
}
-/*
- * xbt_fifo_unshift()
- * at the head
+/**
+ * \param l list
+ * \param t element
+ * \return the bucket that was just added
+ *
+ * Add an object at the head of the list
*/
xbt_fifo_item_t xbt_fifo_unshift(xbt_fifo_t l, void *t)
{
xbt_fifo_item_t new;
- new = xbt_fifo_newitem();
+ new = xbt_fifo_new_item();
new->content = t;
- xbt_fifo_unshift_item(l,new);
+ xbt_fifo_unshift_item(l, new);
return new;
}
-/*
- * xbt_fifo_shift()
- * from the head
+/** Shift
+ * \param l list
+ * \returns the object stored at the head of the list.
+ *
+ * Removes and returns the object stored at the head of the list.
+ * Returns NULL if the list is empty.
*/
void *xbt_fifo_shift(xbt_fifo_t l)
{
xbt_fifo_item_t item;
void *content;
- item = xbt_fifo_shift_item(l);
- if(l==NULL) return NULL;
+ if (l == NULL)
+ return NULL;
+ if (!(item = xbt_fifo_shift_item(l)))
+ return NULL;
content = item->content;
- xbt_fifo_freeitem(item);
+ xbt_fifo_free_item(item);
return content;
}
-/*
- * xbt_fifo_push_item()
- * at the tail
+/** Push a bucket
+ * \param l list
+ * \param new bucket
+ *
+ * Hook up this bucket at the tail of the list
*/
void xbt_fifo_push_item(xbt_fifo_t l, xbt_fifo_item_t new)
{
+ xbt_assert((new->next == NULL) && (new->prev == NULL), "Invalid item!");
(l->count)++;
if (l->head == NULL) {
l->head = new;
l->tail = new;
}
-/*
- * xbt_fifo_pop_item()
- * from the tail
+/** Pop bucket
+ * \param l
+ * \returns the bucket that was at the tail of the list.
+ *
+ * Returns NULL if the list was empty.
*/
xbt_fifo_item_t xbt_fifo_pop_item(xbt_fifo_t l)
{
l->tail->next = NULL;
(l->count)--;
+
+ item->prev = NULL;
+
return item;
}
-/*
- * xbt_fifo_unshift_item()
- * at the head
+/** Push a bucket
+ * \param l list
+ * \param new bucket
+ *
+ * Hook up this bucket at the head of the list
*/
void xbt_fifo_unshift_item(xbt_fifo_t l, xbt_fifo_item_t new)
{
+ xbt_assert((new->next == NULL) && (new->prev == NULL), "Invalid item!");
(l->count)++;
if (l->head == NULL) {
l->head = new;
return;
}
-/*
- * xbt_fifo_shift_item()
- * from the head
+/** Shift bucket
+ * \param l
+ * \returns the bucket that was at the head of the list.
+ *
+ * Returns NULL if the list was empty.
*/
xbt_fifo_item_t xbt_fifo_shift_item(xbt_fifo_t l)
{
l->head->prev = NULL;
(l->count)--;
+
+ item->next = NULL;
+
return item;
}
-/*
- * xbt_fifo_remove()
- * removes an xbt_fifo_item_t using its content from the xbt_fifo
+/**
+ * \param l
+ * \param t an objet
+ *
+ * removes the first occurence of \a t from \a l.
+ * \warning it will not remove duplicates
+ * \return 1 if an item was removed and 0 otherwise.
*/
-void xbt_fifo_remove(xbt_fifo_t l, void *t)
+int xbt_fifo_remove(xbt_fifo_t l, void *t)
{
xbt_fifo_item_t current, current_next;
continue;
/* remove the item */
xbt_fifo_remove_item(l, current);
- xbt_fifo_freeitem(current);
+ xbt_fifo_free_item(current);
/* WILL NOT REMOVE DUPLICATES */
- break;
+ return 1;
}
- return;
+ return 0;
+}
+
+
+/**
+ * \param l
+ * \param t an objet
+ *
+ * removes all occurences of \a t from \a l.
+ * \return 1 if an item was removed and 0 otherwise.
+ */
+int xbt_fifo_remove_all(xbt_fifo_t l, void *t)
+{
+ xbt_fifo_item_t current, current_next;
+ int res = 0;
+
+ for (current = l->head; current; current = current_next) {
+ current_next = current->next;
+ if (current->content != t)
+ continue;
+ /* remove the item */
+ xbt_fifo_remove_item(l, current);
+ xbt_fifo_free_item(current);
+ res = 1;
+ }
+ return res;
}
-/*
- * xbt_fifo_remove_item()
- * removes a given xbt_fifo_item_t from the xbt_fifo
+/**
+ * \param l a list
+ * \param current a bucket
+ *
+ * removes a bucket \a current from the list \a l. This function implicitely
+ * assumes (and doesn't check!) that this item belongs to this list...
*/
void xbt_fifo_remove_item(xbt_fifo_t l, xbt_fifo_item_t current)
{
- if (l->head == l->tail) { /* special case */
- l->head = NULL;
- l->tail = NULL;
- (l->count)--;
- return;
- }
-
- if (current == l->head) { /* It's the head */
- l->head = current->next;
- l->head->prev = NULL;
- } else if (current == l->tail) { /* It's the tail */
- l->tail = current->prev;
- l->tail->next = NULL;
- } else { /* It's in the middle */
- current->prev->next = current->next;
- current->next->prev = current->prev;
- }
+ if (l->head == l->tail) { /* special case */
+ xbt_assert((current == l->head), "This item is not in the list!");
+ l->head = NULL;
+ l->tail = NULL;
(l->count)--;
+ current->prev = current->next = NULL;
+ return;
+ }
+
+ if (current == l->head) { /* It's the head */
+ l->head = current->next;
+ l->head->prev = NULL;
+ } else if (current == l->tail) { /* It's the tail */
+ l->tail = current->prev;
+ l->tail->next = NULL;
+ } else { /* It's in the middle */
+ current->prev->next = current->next;
+ current->next->prev = current->prev;
+ }
+ (l->count)--;
+ current->prev = current->next = NULL;
}
-/*
- * xbt_fifo_is_in()
+/**
+ * \param f a list
+ * \param content an object
+ * \return 1 if \a content is in \a f.
*/
int xbt_fifo_is_in(xbt_fifo_t f, void *content)
{
- xbt_fifo_item_t item = xbt_fifo_getFirstitem(f);
+ xbt_fifo_item_t item = xbt_fifo_get_first_item(f);
while (item) {
if (item->content == content)
return 1;
return 0;
}
-/*
- * xbt_fifo_to_array()
+/**
+ * \param f a list
+ * \return a table with the objects stored in \a f.
*/
void **xbt_fifo_to_array(xbt_fifo_t f)
{
else
array = xbt_new0(void *, f->count);
- for (i = 0, b = xbt_fifo_getFirstitem(f); b; i++, b = b->next) {
+ for (i = 0, b = xbt_fifo_get_first_item(f); b; i++, b = b->next) {
array[i] = b->content;
}
return array;
}
-/*
- * xbt_fifo_Copy()
+/**
+ * \param f a list
+ * \return a copy of \a f.
*/
xbt_fifo_t xbt_fifo_copy(xbt_fifo_t f)
{
copy = xbt_fifo_new();
- for (b = xbt_fifo_getFirstitem(f); b; b = b->next) {
+ for (b = xbt_fifo_get_first_item(f); b; b = b->next) {
xbt_fifo_push(copy, b->content);
}
return copy;
}
-/*
- * xbt_fifo_newitem()
+/* Functions passed to the mallocator constructor */
+static void *fifo_item_mallocator_new_f(void)
+{
+ return xbt_new(s_xbt_fifo_item_t, 1);
+}
+
+static void fifo_item_mallocator_reset_f(void *item)
+{
+ /* memset to zero like calloc */
+ memset(item, 0, sizeof(s_xbt_fifo_item_t));
+}
+
+/** Constructor
+ * \return a new bucket
+ */
+XBT_INLINE xbt_fifo_item_t xbt_fifo_new_item(void)
+{
+ return xbt_mallocator_get(item_mallocator);
+}
+
+/** \deprecated Use #xbt_fifo_new_item instead.
*/
-xbt_fifo_item_t xbt_fifo_newitem(void)
+XBT_INLINE xbt_fifo_item_t xbt_fifo_newitem(void)
{
- return xbt_new0(struct xbt_fifo_item,1);
+ XBT_WARN("This function is deprecated. Use xbt_fifo_new_item.");
+ return xbt_fifo_new_item();
}
-void xbt_fifo_set_item_content(xbt_fifo_item_t i , void *v)
+/**
+ * \param i a bucket
+ * \param v an object
+ *
+ * stores \a v in \a i.
+ */
+XBT_INLINE void xbt_fifo_set_item_content(xbt_fifo_item_t i, void *v)
{
- xbt_fifo_setItemcontent(i,v);
+ xbt_fifo_setItemcontent(i, v);
}
-void *xbt_fifo_get_item_content(xbt_fifo_item_t i)
+/**
+ * \param i a bucket
+ * \return the object stored \a i.
+ */
+XBT_INLINE void *xbt_fifo_get_item_content(xbt_fifo_item_t i)
{
return xbt_fifo_getItemcontent(i);
}
-/*
- * xbt_fifo_freeitem()
+/** Destructor
+ * \param b poor victim
+ *
+ * Free the bucket but does not modifies the object (if any) that was stored in it.
+ */
+XBT_INLINE void xbt_fifo_free_item(xbt_fifo_item_t b)
+{
+ xbt_mallocator_release(item_mallocator, b);
+ return;
+}
+
+/** Destructor
+ * \deprecated Use #xbt_fifo_free_item instead.
*/
-void xbt_fifo_freeitem(xbt_fifo_item_t b)
+XBT_INLINE void xbt_fifo_freeitem(xbt_fifo_item_t b)
{
- free(b);
+ XBT_WARN("This function is deprecated. Use xbt_fifo_free_item.");
+ xbt_fifo_free_item(b);
return;
}
-int xbt_fifo_size(xbt_fifo_t f)
+/**
+ * \param f a list
+ * \return the number of buckets in \a f.
+ */
+XBT_INLINE int xbt_fifo_size(xbt_fifo_t f)
{
return f->count;
}
+/**
+ * \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)
+{
+ return l->head;
+}
+
+/**
+ * \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)
+{
+ return l->tail;
+}
+
+/** \deprecated Use #xbt_fifo_get_first_item instead.
+ */
+XBT_INLINE xbt_fifo_item_t xbt_fifo_getFirstItem(xbt_fifo_t l)
+{
+ XBT_WARN("This function is deprecated. Use xbt_fifo_get_first_item.");
+ return xbt_fifo_get_first_item(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)
+{
+ if (i)
+ return i->next;
+ return NULL;
+}
+
+/** \deprecated Use #xbt_fifo_get_next_item instead.
+ */
+xbt_fifo_item_t xbt_fifo_getNextItem(xbt_fifo_item_t i)
+{
+ XBT_WARN("This function is deprecated. Use xbt_fifo_get_next_item.");
+ return xbt_fifo_get_next_item(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)
+{
+ if (i)
+ return i->prev;
+ return NULL;
+}
+
+/** \deprecated Use #xbt_fifo_get_prev_item instead.
+ */
+xbt_fifo_item_t xbt_fifo_getPrevItem(xbt_fifo_item_t i)
+{
+ XBT_WARN("This function is deprecated. Use xbt_fifo_get_prev_item.");
+ return xbt_fifo_get_prev_item(i);
+}
+
+/* Module init/exit handling the fifo item mallocator
+ * These are internal XBT functions called by xbt_preinit/postexit().
+ * It can be used several times to recreate the mallocator, for example when you switch to MC mode
+ */
+void xbt_fifo_preinit(void)
+{
+ item_mallocator = xbt_mallocator_new(65536,
+ fifo_item_mallocator_new_f,
+ fifo_item_mallocator_free_f,
+ fifo_item_mallocator_reset_f);
+}
+
+void xbt_fifo_postexit(void)
+{
+ if (item_mallocator != NULL) {
+ xbt_mallocator_free(item_mallocator);
+ item_mallocator = NULL;
+ }
+}
+/* @} */
