2000-10-23 12:55:51 +00:00
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/* $FreeBSD$ */
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/* $NecBSD: physio_proc.h,v 3.4 1999/07/23 20:47:03 honda Exp $ */
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/* $NetBSD$ */
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/*
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* [NetBSD for NEC PC-98 series]
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* Copyright (c) 1998
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* NetBSD/pc98 porting staff. 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _I386_PHYSIO_PROC_H_
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#define _I386_PHYSIO_PROC_H_
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#include <sys/buf.h>
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#include <sys/queue.h>
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struct physio_proc;
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TAILQ_HEAD(physio_proc_head, physio_proc);
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struct physio_proc_head physio_proc_freet, physio_proc_busyt;
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struct physio_proc {
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TAILQ_ENTRY(physio_proc) pp_chain;
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struct proc *pp_proc;
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};
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static __inline struct physio_proc *physio_proc_enter __P((struct buf *));
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static __inline void physio_proc_leave __P((struct physio_proc *));
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static __inline struct physio_proc *
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physio_proc_enter(bp)
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struct buf *bp;
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{
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struct physio_proc *pp;
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int s;
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if (bp == NULL || (bp->b_flags & B_PHYS) == 0)
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return NULL;
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2001-01-24 00:01:42 +00:00
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if ((pp = TAILQ_FIRST(&physio_proc_freet)) == NULL)
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2000-10-23 12:55:51 +00:00
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return NULL;
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s = splstatclock();
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TAILQ_REMOVE(&physio_proc_freet, pp, pp_chain);
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#if !defined(__FreeBSD__) || __FreeBSD_version < 400001
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pp->pp_proc = bp->b_proc;
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#endif
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TAILQ_INSERT_TAIL(&physio_proc_busyt, pp, pp_chain);
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splx(s);
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return pp;
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}
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static __inline void
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physio_proc_leave(pp)
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struct physio_proc *pp;
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{
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int s;
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if (pp == NULL)
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return;
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s = splstatclock();
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TAILQ_REMOVE(&physio_proc_busyt, pp, pp_chain);
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TAILQ_INSERT_TAIL(&physio_proc_freet, pp, pp_chain);
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pp->pp_proc = NULL;
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splx(s);
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}
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void physio_proc_init __P((void));
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#endif /* _I386_PHYSIO_PROC_H_ */
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