79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
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/*
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* Copyright (C) 2013 Vincenzo Maffione. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*/
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#ifndef __NETMAP_MBQ_H__
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#define __NETMAP_MBQ_H__
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/*
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* These function implement an mbuf tailq with an optional lock.
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* The base functions act ONLY ON THE QUEUE, whereas the "safe"
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* variants (mbq_safe_*) also handle the lock.
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*/
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/* XXX probably rely on a previous definition of SPINLOCK_T */
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#ifdef linux
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#define SPINLOCK_T safe_spinlock_t
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#else
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#define SPINLOCK_T struct mtx
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#endif
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/* A FIFO queue of mbufs with an optional lock. */
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struct mbq {
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struct mbuf *head;
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struct mbuf *tail;
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int count;
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SPINLOCK_T lock;
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};
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/* XXX "destroy" does not match "init" as a name.
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* We should also clarify whether init can be used while
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* holding a lock, and whether mbq_safe_destroy() is a NOP.
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*/
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void mbq_init(struct mbq *q);
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void mbq_destroy(struct mbq *q);
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void mbq_enqueue(struct mbq *q, struct mbuf *m);
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struct mbuf *mbq_dequeue(struct mbq *q);
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void mbq_purge(struct mbq *q);
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/* XXX missing mbq_lock() and mbq_unlock */
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void mbq_safe_init(struct mbq *q);
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void mbq_safe_destroy(struct mbq *q);
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void mbq_safe_enqueue(struct mbq *q, struct mbuf *m);
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struct mbuf *mbq_safe_dequeue(struct mbq *q);
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void mbq_safe_purge(struct mbq *q);
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static inline unsigned int mbq_len(struct mbq *q)
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{
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return q->count;
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}
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#endif /* __NETMAP_MBQ_H_ */
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