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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_pqueue_h__
#define INCLUDE_pqueue_h__
#include "vector.h"
typedef git_vector git_pqueue;
enum {
/* flag meaning: don't grow heap, keep highest values only */
GIT_PQUEUE_FIXED_SIZE = (GIT_VECTOR_FLAG_MAX << 1),
};
/**
* Initialize priority queue
*
* @param pq The priority queue struct to initialize
* @param flags Flags (see above) to control queue behavior
* @param init_size The initial queue size
* @param cmp The entry priority comparison function
* @return 0 on success, <0 on error
*/
extern int git_pqueue_init(
git_pqueue *pq,
uint32_t flags,
size_t init_size,
git_vector_cmp cmp);
#define git_pqueue_free git_vector_free
#define git_pqueue_clear git_vector_clear
#define git_pqueue_size git_vector_length
#define git_pqueue_get git_vector_get
/**
* Insert a new item into the queue
*
* @param pq The priority queue
* @param item Pointer to the item data
* @return 0 on success, <0 on failure
*/
extern int git_pqueue_insert(git_pqueue *pq, void *item);
/**
* Remove the top item in the priority queue
*
* @param pq The priority queue
* @return item from heap on success, NULL if queue is empty
*/
extern void *git_pqueue_pop(git_pqueue *pq);
#endif
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