718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2013-2014 Vincenzo Maffione
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* 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 _NET_NETMAP_MBQ_H__
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#define _NET_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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#elif defined (_WIN32)
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#define SPINLOCK_T win_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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/* We should 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_fini(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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static inline struct mbuf *
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mbq_peek(struct mbq *q)
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{
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return q->head;
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}
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static inline void
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mbq_lock(struct mbq *q)
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{
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mtx_lock_spin(&q->lock);
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}
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static inline void
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mbq_unlock(struct mbq *q)
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{
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mtx_unlock_spin(&q->lock);
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}
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void mbq_safe_init(struct mbq *q);
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void mbq_safe_fini(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 /* _NET_NETMAP_MBQ_H_ */
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