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/*
* Copyright (C) 2015 Daniel Krebs
* 2016 INRIA
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup net_gnrc_priority_pktqueue Priority packet queue for GNRC
* @ingroup net_gnrc
* @brief Wrapper for priority_queue that holds gnrc_pktsnip_t*
* @{
*
* @file
* @brief gnrc priority packet queue API
*
* @author Daniel Krebs <github@daniel-krebs.net>
* @author Shuguo Zhuo <shuguo.zhuo@inria.fr>
*/
#ifndef GNRC_PRIORITY_PKTQUEUE_H
#define GNRC_PRIORITY_PKTQUEUE_H
#include <stdint.h>
#include <priority_queue.h>
#include <net/gnrc/pkt.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief data type for gnrc priority packet queue nodes
*/
typedef struct gnrc_priority_pktqueue_node {
struct gnrc_priority_pktqueue_node *next; /**< next queue node */
uint32_t priority; /**< queue node priority */
gnrc_pktsnip_t *pkt; /**< queue node data */
} gnrc_priority_pktqueue_node_t;
/**
* @brief data type for gnrc priority packet queues
*/
typedef priority_queue_t gnrc_priority_pktqueue_t;
/**
* @brief Static initializer for gnrc_priority_pktqueue_node_t.
*/
#define PRIORITY_PKTQUEUE_NODE_INIT(priority, pkt) { NULL, priority, pkt }
/**
* @brief Static initializer for gnrc_priority_pktqueue_t.
*/
#define PRIORITY_PKTQUEUE_INIT { NULL }
/**
* @brief Initialize a gnrc priority packet queue node object.
*
* @param[out] node
* pre-allocated gnrc_priority_pktqueue_node_t object, must not be NULL.
* @param[in] priority
* the priority of the gnrc packet snip
* @param[in] pkt
* the gnrc packet snip
*/
static inline void gnrc_priority_pktqueue_node_init(gnrc_priority_pktqueue_node_t *node,
uint32_t priority,
gnrc_pktsnip_t *pkt)
{
node->next = NULL;
node->priority = priority;
node->pkt = pkt;
}
/**
* @brief Initialize a gnrc priority packet queue object.
*
* @param[out] queue
* pre-allocated gnrc_priority_pktqueue_t object, must not be NULL.
*/
static inline void gnrc_priority_pktqueue_init(gnrc_priority_pktqueue_t *queue)
{
gnrc_priority_pktqueue_t qn = PRIORITY_PKTQUEUE_INIT;
*queue = qn;
}
/**
* @brief Get the length information of a gnrc priority packet queue object.
*
* @param[in] queue
* pre-allocated gnrc_priority_pktqueue_t object, must not be NULL.
* @return the length of @p queue
*/
uint32_t gnrc_priority_pktqueue_length(gnrc_priority_pktqueue_t *queue);
/**
* @brief flush the gnrc priority packet queue
*
* @param[out] queue the gnrc priority packet queue, must not be NULL
*/
void gnrc_priority_pktqueue_flush(gnrc_priority_pktqueue_t* queue);
/**
* @brief Get first element and remove it from @p queue
*
* @param[out] queue the gnrc priority packet queue, may not be NULL
*
* @return the old head
*/
gnrc_pktsnip_t* gnrc_priority_pktqueue_pop(gnrc_priority_pktqueue_t* queue);
/**
* @brief Get first element from @p queue without removing
*
* @param[in] queue the gnrc priority packet queue, may not be NULL
*
* @return the head of @p queue
*/
gnrc_pktsnip_t* gnrc_priority_pktqueue_head(gnrc_priority_pktqueue_t* queue);
/**
* @brief add @p node into @p queue based on its priority
*
* @param[in,out] queue the gnrc priority packet queue, must not be NULL
* @param[in] node the node to add.
*/
void gnrc_priority_pktqueue_push(gnrc_priority_pktqueue_t* queue,
gnrc_priority_pktqueue_node_t *node);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_PRIORITY_PKTQUEUE_H */
/** @} */
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