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 *  @param order The packet order value. Input parameter.
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 *  @param order The packet order value. Input parameter.
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 *  @param metric The metric value of the packet. Input parameter.
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 *  @param metric The metric value of the packet. Input parameter.
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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, int 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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 *  @param first The first packet of the queue. Input parameter.
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 *  @param order The packet order value. Input parameter.
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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 packet is not found.
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 */
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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 packet The packet in the queue. Input parameter.
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 *  @param new_packet The new packet to be inserted.
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 *  @param new_packet The new packet to be inserted. Input parameter.
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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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/** 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 packet The packet to be set. Input parameter.
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 *  @param order The packet order value. Input parameter.
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 *  @param order The packet order value. Input parameter.
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 *  @param metric The metric value of the packet. Input parameter.
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 *  @param metric The metric value of the packet. Input parameter.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is invalid..
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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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/** 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 order The packet order value. Output parameter.
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 *  @param metric The metric value of the packet. Ouput parameter.
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 *  @returns EOK on success.
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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( packet_t packet, int 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 first The first packet of the queue. Input parameter.
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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 packet_release The releasing function called for each of the packets after its detachment. Input parameter.