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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, int order, size_t metric );
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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 new_packet The new packet to be inserted.
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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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 */
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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 packet The packet to be detached. Input parameter.
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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.