/*
 * Copyright (c) 2008, 2009 Nicira Networks.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef QUEUE_H
#define QUEUE_H 1

/* Packet queue. */
struct ovs_queue {
    int n;                      /* Number of queued packets. */
    struct ofpbuf *head;        /* First queued packet, null if n == 0. */
    struct ofpbuf *tail;        /* Last queued packet, null if n == 0. */
};

void queue_init(struct ovs_queue *);
void queue_destroy(struct ovs_queue *);
void queue_clear(struct ovs_queue *);
void queue_advance_head(struct ovs_queue *, struct ofpbuf *next);
void queue_push_tail(struct ovs_queue *, struct ofpbuf *);
struct ofpbuf *queue_pop_head(struct ovs_queue *);

#endif /* queue.h */