2 * Copyright (C) 2013-2014 Vincenzo Maffione
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #ifndef __NETMAP_MBQ_H__
33 #define __NETMAP_MBQ_H__
36 * These function implement an mbuf tailq with an optional lock.
37 * The base functions act ONLY ON THE QUEUE, whereas the "safe"
38 * variants (mbq_safe_*) also handle the lock.
41 /* XXX probably rely on a previous definition of SPINLOCK_T */
43 #define SPINLOCK_T safe_spinlock_t
44 #elif defined (_WIN32)
45 #define SPINLOCK_T win_spinlock_t
47 #define SPINLOCK_T struct mtx
50 /* A FIFO queue of mbufs with an optional lock. */
58 /* We should clarify whether init can be used while
59 * holding a lock, and whether mbq_safe_destroy() is a NOP.
61 void mbq_init(struct mbq *q);
62 void mbq_fini(struct mbq *q);
63 void mbq_enqueue(struct mbq *q, struct mbuf *m);
64 struct mbuf *mbq_dequeue(struct mbq *q);
65 void mbq_purge(struct mbq *q);
67 static inline struct mbuf *
68 mbq_peek(struct mbq *q)
70 return q->head ? q->head : NULL;
74 mbq_lock(struct mbq *q)
76 mtx_lock_spin(&q->lock);
80 mbq_unlock(struct mbq *q)
82 mtx_unlock_spin(&q->lock);
86 void mbq_safe_init(struct mbq *q);
87 void mbq_safe_fini(struct mbq *q);
88 void mbq_safe_enqueue(struct mbq *q, struct mbuf *m);
89 struct mbuf *mbq_safe_dequeue(struct mbq *q);
90 void mbq_safe_purge(struct mbq *q);
92 static inline unsigned int mbq_len(struct mbq *q)
97 #endif /* __NETMAP_MBQ_H_ */