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/** @name Packet management system interface
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/** @name Packet management system interface
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 */
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 */
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/*@{*/
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/*@{*/
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/** Finds the packet mapping.
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/** Finds the packet mapping.
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 *  @param packet_id The packet identifier to be found. Input parameter.
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 *  @param[in] packet_id The packet identifier to be found.
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 *  @returns The found packet reference.
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 *  @returns The found packet reference.
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 *  @returns NULL if the mapping does not exist.
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 *  @returns NULL if the mapping does not exist.
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 */
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 */
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packet_t    pm_find( packet_id_t packet_id );
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packet_t    pm_find( packet_id_t packet_id );
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/** Adds the packet mapping.
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/** Adds the packet mapping.
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 *  @param packet The packet to be remembered. Input parameter.
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 *  @param[in] packet The packet to be remembered.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is not valid.
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 *  @returns EINVAL if the packet is not valid.
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 *  @returns EINVAL if the packet map is not initialized.
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 *  @returns EINVAL if the packet map is not initialized.
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 *  @returns ENOMEM if there is not enough memory left.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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 */
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void    pm_destroy( void );
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void    pm_destroy( void );
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/** Add packet to the sorted queue.
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/** Add packet to the sorted queue.
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 *  The queue is sorted in the ascending order.
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 *  The queue is sorted in the ascending order.
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 *  The packet is inserted right before the packets of the same order value.
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 *  The packet is inserted right before the packets of the same order value.
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 *  @param first The first packet of the queue. May be NULL. Input parameter.
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 *  @param[in] first The first packet of the queue. May be NULL.
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 *  @param packet The packet to be added. Input parameter.
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 *  @param[in] packet The packet to be added.
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 *  @param order The packet order value. Input parameter.
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 *  @param[in] order The packet order value.
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 *  @param metric The metric value of the packet. Input parameter.
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 *  @param[in] metric The metric value of the packet.
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 *  @returns The first packet of the queue. The original first packet may be shifted by the new packet.
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 *  @returns The first packet of the queue. The original first packet may be shifted by the new packet.
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 *  @returns NULL if the packet is not valid.
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 *  @returns NULL if the packet is not valid.
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 */
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 */
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packet_t    pq_add( packet_t first, packet_t packet, size_t order, size_t metric );
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packet_t    pq_add( packet_t first, packet_t packet, size_t order, size_t metric );
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/** Finds the packet with the given order.
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/** Finds the packet with the given order.
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 *  @param first The first packet of the queue. Input parameter.
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 *  @param[in] first The first packet of the queue.
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 *  @param order The packet order value. Input parameter.
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 *  @param[in] order The packet order value.
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 *  @returns The packet with the given order.
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 *  @returns The packet with the given order.
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 *  @returns NULL if the first packet is not valid.
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 *  @returns NULL if the first packet is not valid.
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 *  @returns NULL if the packet is not found.
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 *  @returns NULL if the packet is not found.
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 */
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 */
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packet_t    pq_find( packet_t first, size_t order );
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packet_t    pq_find( packet_t first, size_t order );
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/** Inserts packet after the given one.
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/** Inserts packet after the given one.
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 *  @param packet The packet in the queue. Input parameter.
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 *  @param[in] packet The packet in the queue.
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 *  @param new_packet The new packet to be inserted. Input parameter.
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 *  @param[in] new_packet The new packet to be inserted.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns EINVAL if etiher of the packets is invalid.
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 *  @returns EINVAL if etiher of the packets is invalid.
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 */
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 */
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int pq_insert_after( packet_t packet, packet_t new_packet );
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int pq_insert_after( packet_t packet, packet_t new_packet );
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/** Detach the packet from the queue.
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/** Detach the packet from the queue.
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 *  @param packet The packet to be detached. Input parameter.
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 *  @param[in] packet The packet to be detached.
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 *  @returns The next packet in the queue. If the packet is the first one of the queue, this becomes the new first one.
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 *  @returns The next packet in the queue. If the packet is the first one of the queue, this becomes the new first one.
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 *  @returns NULL if there is no packet left.
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 *  @returns NULL if there is no packet left.
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 *  @returns NULL if the packet is not valid.
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 *  @returns NULL if the packet is not valid.
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 */
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 */
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packet_t    pq_detach( packet_t packet );
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packet_t    pq_detach( packet_t packet );
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/** Sets the packet order and metric attributes.
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/** Sets the packet order and metric attributes.
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 *  @param packet The packet to be set. Input parameter.
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 *  @param[in] packet The packet to be set.
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 *  @param order The packet order value. Input parameter.
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 *  @param[in] order The packet order value.
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 *  @param metric The metric value of the packet. Input parameter.
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 *  @param[in] metric The metric value of the packet.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is invalid..
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 *  @returns EINVAL if the packet is invalid..
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 */
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 */
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int pq_set_order( packet_t packet, size_t order, size_t metric );
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int pq_set_order( packet_t packet, size_t order, size_t metric );
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/** Sets the packet order and metric attributes.
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/** Sets the packet order and metric attributes.
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 *  @param packet The packet to be set. Input parameter.
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 *  @param[in] packet The packet to be set.
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 *  @param order The packet order value. Output parameter.
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 *  @param[out] order The packet order value.
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 *  @param metric The metric value of the packet. Ouput parameter.
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 *  @param[out] metric The metric value of the packet.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is invalid..
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 *  @returns EINVAL if the packet is invalid..
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 */
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 */
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int pq_get_order( packet_t packet, size_t * order, size_t * metric );
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int pq_get_order( packet_t packet, size_t * order, size_t * metric );
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/** Releases the whole queue.
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/** Releases the whole queue.
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 *  Detaches all packets of the queue and calls the packet_release() for each of them.
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 *  Detaches all packets of the queue and calls the packet_release() for each of them.
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 *  @param first The first packet of the queue. Input parameter.
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 *  @param[in] first The first packet of the queue.
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 *  @param packet_release The releasing function called for each of the packets after its detachment. Input parameter.
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 *  @param[in] packet_release The releasing function called for each of the packets after its detachment.
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 */
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 */
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void    pq_destroy( packet_t first, void ( * packet_release )( packet_t packet ));
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void    pq_destroy( packet_t first, void ( * packet_release )( packet_t packet ));
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/** Returns the next packet in the queue.
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/** Returns the next packet in the queue.
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 *  @param packet The packet queue member. Input parameter.
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 *  @param[in] packet The packet queue member.
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 *  @returns The next packet in the queue.
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 *  @returns The next packet in the queue.
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 *  @returns NULL if there is no next packet.
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 *  @returns NULL if there is no next packet.
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 *  @returns NULL if the packet is not valid.
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 *  @returns NULL if the packet is not valid.
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 */
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 */
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packet_t    pq_next( packet_t packet );
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packet_t    pq_next( packet_t packet );
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/** Returns the previous packet in the queue.
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/** Returns the previous packet in the queue.
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 *  @param packet The packet queue member. Input parameter.
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 *  @param[in] packet The packet queue member.
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 *  @returns The previous packet in the queue.
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 *  @returns The previous packet in the queue.
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 *  @returns NULL if there is no previous packet.
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 *  @returns NULL if there is no previous packet.
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 *  @returns NULL if the packet is not valid.
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 *  @returns NULL if the packet is not valid.
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 */
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 */
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packet_t    pq_previous( packet_t packet );
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packet_t    pq_previous( packet_t packet );