-/* a generic and efficient heap */
-
-/* Copyright (c) 2004-2005, 2007-2017. 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. */
-
-#include "xbt/sysdep.h"
-#include "xbt/log.h"
-#include "heap_private.h"
-
-#include <stdio.h>
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_heap, xbt, "Heap");
-
-static void xbt_heap_max_heapify(xbt_heap_t H, int i);
-static void xbt_heap_increase_key(xbt_heap_t H, int i);
-
-/** @addtogroup XBT_heap
- * \brief This section describes the API to generic heap with O(log(n)) access.
- */
-
-/**
- * @brief Creates a new heap.
- * \param init_size initial size of the heap
- * \param free_func function to call on each element when you want to free the whole heap (or NULL if nothing to do).
- *
- * Creates a new heap.
- */
-inline xbt_heap_t xbt_heap_new(int init_size, void_f_pvoid_t const free_func)
-{
- xbt_heap_t H = xbt_new0(struct xbt_heap, 1);
- H->size = init_size;
- H->count = 0;
- H->items = (xbt_heap_item_t) xbt_new0(struct xbt_heap_item, init_size);
- H->free = free_func;
- return H;
-}
-
-/**
- * @brief Set the update callback function.
- * @param H the heap we're working on
- * \param update_callback function to call on each element to update its index when needed.
- */
-inline void xbt_heap_set_update_callback(xbt_heap_t H, void (*update_callback) (void*, int))
-{
- H->update_callback = update_callback;
-}
-
-/**
- * @brief kilkil a heap and its content
- * @param H poor victim
- */
-void xbt_heap_free(xbt_heap_t H)
-{
- if (!H)
- return;
-
- if (H->free)
- for (int i = 0; i < H->count; i++)
- H->free(H->items[i].content);
- free(H->items);
- free(H);
-}
-
-/**
- * @brief returns the number of elements in the heap
- * @param H the heap we're working on
- * @return the number of elements in the heap
- */
-inline int xbt_heap_size(xbt_heap_t H)
-{
- return (H->count);
-}
-
-/**
- * @brief Add an element into the heap.
- * \param H the heap we're working on
- * \param content the object you want to add to the heap
- * \param key the key associated to this object
- *
- * The element with the smallest key is automatically moved at the top of the heap.
- */
-void xbt_heap_push(xbt_heap_t H, void *content, double key)
-{
- H->count += 1;
- int count = H->count;
-
- int size = H->size;
- xbt_heap_item_t item;
-
- if (count > size) {
- H->size = (size << 1) + 1;
- H->items = (void *) xbt_realloc(H->items, (H->size) * sizeof(struct xbt_heap_item));
- xbt_assert(H->items != NULL);
- }
-
- item = &(H->items[count - 1]);
- item->key = key;
- item->content = content;
- xbt_heap_increase_key(H, count - 1);
- XBT_DEBUG("Heap has now %d elements and max elem is %g",xbt_heap_size(H),xbt_heap_maxkey(H));
-}
-
-/**
- * @brief Extracts from the heap and returns the element with the smallest key.
- * \param H the heap we're working on
- * \return the element with the smallest key
- *
- * Extracts from the heap and returns the element with the smallest key. The element with the next smallest key is
- * automatically moved at the top of the heap.
- */
-void *xbt_heap_pop(xbt_heap_t H)
-{
- xbt_heap_item_t items = H->items;
- int size = H->size;
- void *max;
-
- if (H->count == 0)
- return NULL;
-
- XBT_DEBUG("Heap has %d elements before extraction and max elem was %g",xbt_heap_size(H),xbt_heap_maxkey(H));
-
- max = CONTENT(H, 0);
-
- items[0] = items[(H->count) - 1];
- (H->count)--;
- xbt_heap_max_heapify(H,0);
- if (H->count < size >> 2 && size > 16) {
- size = (size >> 1) + 1;
- H->items = (void *) xbt_realloc(items, size * sizeof(struct xbt_heap_item));
- H->size = size;
- }
-
- if (H->update_callback)
- H->update_callback(max, -1);
- return max;
-}
-
-/**
- * @brief Extracts from the heap and returns the element at position i.
- * \param H the heap we're working on
- * \param i element position
- * \return the element at position i if ok, NULL otherwise
- *
- * Extracts from the heap and returns the element at position i. The heap is automatically reordered.
- */
-void *xbt_heap_remove(xbt_heap_t H, int i)
-{
- XBT_DEBUG("Heap has %d elements: extracting element %d",xbt_heap_size(H),i);
-
- if ((i < 0) || (i > H->count - 1))
- return NULL;
- /* put element i at head */
- if (i > 0) {
- KEY(H, i) = MIN_KEY_VALUE;
- xbt_heap_increase_key(H, i);
- }
-
- return xbt_heap_pop(H);
-}
-
-/** @brief Remove an arbitrary element from the heap
- * \param H the heap we're working on
- * \param content the object you want to remove from the heap
- * \param key the key associated to this object
- * \return the removed element if found, NULL otherwise
- */
-void *xbt_heap_rm_elm(xbt_heap_t H, void *content, double key)
-{
- int i=0;
- while (i < H->count && (KEY(H, i) != key || CONTENT(H, i) != content))
- i++;
- return xbt_heap_remove(H, i);
-}
-
-/**
- * @brief Updates an element of the heap with a new value.
- * \param H the heap we're working on
- * \param i element position
- * \param key new value for the element
- *
- * Updates an element of the heap with a new value.
- */
-void xbt_heap_update(xbt_heap_t H, int i, double key)
-{
- XBT_DEBUG("Heap has %d elements: updating element %d : was %1.12f to %1.12f ",xbt_heap_size(H),i,KEY(H, i), key);
-
- if ((i < 0) || (i > H->count - 1) || key == KEY(H, i))
- return ;
-
- if(key< KEY(H, i)){
- KEY(H, i)=key;
- xbt_heap_increase_key(H, i);
- }else{
- KEY(H, i)=key;
- xbt_heap_max_heapify(H,i);
- }
-}
-
-/**
- * @brief returns the smallest key in the heap (heap unchanged)
- * \param H the heap we're working on
- *
- * \return the smallest key in the heap without modifying the heap.
- */
-inline double xbt_heap_maxkey(xbt_heap_t H)
-{
- xbt_assert(H->count != 0, "Empty heap");
- return KEY(H, 0);
-}
-
-/**
- * @brief returns the value associated to the smallest key in the heap (heap unchanged)
- * \param H the heap we're working on
- *
- * \return the value associated to the smallest key in the heap
- * without modifying the heap.
- */
-void *xbt_heap_maxcontent(xbt_heap_t H)
-{
- xbt_assert(H->count != 0, "Empty heap");
- return CONTENT(H, 0);
-}
-
-/* <<<< private >>>>
- * \param H the heap we're working on
- *
- * Restores the heap property once an element has been deleted.
- */
-static void xbt_heap_max_heapify(xbt_heap_t H, int index)
-{
- int i = index;
- int count = H->count;
- xbt_heap_item_t items = H->items;
-
- while (1) {
- int greatest = i;
- int l = LEFT(i);
- int r = l + 1;
- if (l < count && items[l].key < items[i].key)
- greatest = l;
- if (r < count && items[r].key < items[greatest].key)
- greatest = r;
- if (greatest != i) {
- struct xbt_heap_item tmp = items[i];
- items[i] = items[greatest];
- items[greatest] = tmp;
- if (H->update_callback)
- H->update_callback(items[i].content, i);
- i = greatest;
- } else {
- if (H->update_callback)
- H->update_callback(items[i].content, i);
- return;
- }
- }
-}
-
-/* <<<< private >>>>
- * \param H the heap we're working on
- * \param i an item position in the heap
- *
- * Moves up an item at position i to its correct position. Works only when called from xbt_heap_push.
- * Do not use otherwise.
- */
-static void xbt_heap_increase_key(xbt_heap_t H, int i)
-{
- xbt_heap_item_t items = H->items;
- int p = PARENT(i);
- while (i > 0 && items[p].key > items[i].key) {
- struct xbt_heap_item tmp = items[i];
- items[i] = items[p];
- items[p] = tmp;
- if (H->update_callback)
- H->update_callback(items[i].content, i);
- i = p;
- p = PARENT(i);
- }
- if (H->update_callback)
- H->update_callback(items[i].content, i);
-}
