gw-prioqueue.h

The Kannel Open Source WAP and SMS gateway works as both an SMS gateway, for implementing keyword b

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/*
 * gw-prioqueue.h - generic priority queue.
 *
 * Algorithm ala Robert Sedgewick.
 *
 * Alexander Malysh <olek2002 at hotmail.com>, 2004
 */

#ifndef GW_PRIOQUEUE_H
#define GW_PRIOQUEUE_H 1

typedef struct gw_prioqueue gw_prioqueue_t;

/**
 * Create priority queue
 * @cmp - compare function
 * @return newly created priority queue
 */
gw_prioqueue_t *gw_prioqueue_create(int(*cmp)(const void*, const void *));

/**
 * Destroy priority queue
 * @queue - queue to destroy
 * @item_destroy - item destructor
 */
void gw_prioqueue_destroy(gw_prioqueue_t *queue, void(*item_destroy)(void*));

/**
 * Return priority queue length
 * @queue - priority queue
 * @return length of this priority queue
 */
long gw_prioqueue_len(gw_prioqueue_t *queue);

/**
 * Insert item into the priority queue
 * @queue - priority queue
 * @item - to be inserted item
 */
void gw_prioqueue_insert(gw_prioqueue_t *queue, void *item);

#define gw_prioqueue_produce(queue, item) gw_prioqueue_insert(queue, item)

void gw_prioqueue_foreach(gw_prioqueue_t *queue, void(*fn)(const void *, long));

/**
 * Remove biggest item from the priority queue, but not block if producers
 * available and none items in the queue
 * @queue - priority queue
 * @return - biggest item or NULL if none items in the queue
 */
void *gw_prioqueue_remove(gw_prioqueue_t *queue);

/*
 * Same as gw_prioqueue_remove, except that item is not removed from the
 * priority queue
 */
void *gw_prioqueue_get(gw_prioqueue_t *queue);

/**
 * Remove biggest item from the priority queue, but block if producers
 * available and none items in the queue
 * @queue - priority queue
 * @return biggest item or NULL if none items and none producers in the queue
 */
void *gw_prioqueue_consume(gw_prioqueue_t *queue);

/**
 * Add producer to the priority queue
 * @queue - priority queue
 */
void gw_prioqueue_add_producer(gw_prioqueue_t *queue);

/**
 * Remove producer from the priority queue
 * @queue - priority queue
 */
void gw_prioqueue_remove_producer(gw_prioqueue_t *queue);

/**
 * Return producer count for the priority queue
 * @queue - priority queue
 * @return producer count
 */
long gw_prioqueue_producer_count(gw_prioqueue_t *queue);

#endif