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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SRC_LIBUTIL_HEAP_H_
#define SRC_LIBUTIL_HEAP_H_
#include "config.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Binary minimal heap interface based on glib
*/
struct rspamd_min_heap_elt {
gpointer data;
guint pri;
guint idx;
};
struct rspamd_min_heap;
/**
* Creates min heap with the specified reserved size and compare function
* @param reserved_size reserved size in elements
* @return opaque minimal heap
*/
struct rspamd_min_heap *rspamd_min_heap_create(gsize reserved_size);
/**
* Pushes an element to the heap. `pri` should be initialized to use this function,
* `idx` is used internally by heap interface
* @param heap heap structure
* @param elt element to push
*/
void rspamd_min_heap_push(struct rspamd_min_heap *heap,
struct rspamd_min_heap_elt *elt);
/**
* Pops the minimum element from the heap and reorder the queue
* @param heap heap structure
* @return minimum element
*/
struct rspamd_min_heap_elt *rspamd_min_heap_pop(struct rspamd_min_heap *heap);
/**
* Updates priority for the element. It must be in queue (so `idx` should be sane)
* @param heap heap structure
* @param elt element to update
* @param npri new priority
*/
void rspamd_min_heap_update_elt(struct rspamd_min_heap *heap,
struct rspamd_min_heap_elt *elt, guint npri);
/**
* Removes element from the heap
* @param heap
* @param elt
*/
void rspamd_min_heap_remove_elt(struct rspamd_min_heap *heap,
struct rspamd_min_heap_elt *elt);
/**
* Destroys heap (elements are not destroyed themselves)
* @param heap
*/
void rspamd_min_heap_destroy(struct rspamd_min_heap *heap);
/**
* Returns element from the heap with the specified index
* @param heap
* @param idx
* @return
*/
struct rspamd_min_heap_elt *rspamd_min_heap_index(struct rspamd_min_heap *heap,
guint idx);
#ifdef __cplusplus
}
#endif
#endif /* SRC_LIBUTIL_HEAP_H_ */
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