what the heck one last one before i go take a nap...
[dragonfly.git] / sys / i386 / include / physio_proc.h
CommitLineData
984263bc 1/* $FreeBSD: src/sys/i386/include/physio_proc.h,v 1.1.2.1 2000/10/29 11:05:48 non Exp $ */
3ae0cd58 2/* $DragonFly: src/sys/i386/include/Attic/physio_proc.h,v 1.4 2003/08/26 21:42:18 rob Exp $ */
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3/* $NecBSD: physio_proc.h,v 3.4 1999/07/23 20:47:03 honda Exp $ */
4/* $NetBSD$ */
5
6/*
7 * [NetBSD for NEC PC-98 series]
8 * Copyright (c) 1998
9 * NetBSD/pc98 porting staff. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
30 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
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34#ifndef _MACHINE_PHYSIO_PROC_H_
35#define _MACHINE_PHYSIO_PROC_H_
36
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37#include <sys/buf.h>
38#include <sys/queue.h>
39
40struct physio_proc;
41TAILQ_HEAD(physio_proc_head, physio_proc);
42struct physio_proc_head physio_proc_freet, physio_proc_busyt;
43
44struct physio_proc {
45 TAILQ_ENTRY(physio_proc) pp_chain;
46 struct proc *pp_proc;
47};
48
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49static __inline struct physio_proc *physio_proc_enter (struct buf *);
50static __inline void physio_proc_leave (struct physio_proc *);
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51
52static __inline struct physio_proc *
53physio_proc_enter(bp)
54 struct buf *bp;
55{
56 struct physio_proc *pp;
57 int s;
58
59 if (bp == NULL || (bp->b_flags & B_PHYS) == 0)
60 return NULL;
61 if ((pp = physio_proc_freet.tqh_first) == NULL)
62 return NULL;
63
64 s = splstatclock();
65 TAILQ_REMOVE(&physio_proc_freet, pp, pp_chain);
66#if !defined(__FreeBSD__) || __FreeBSD_version < 400001
67 pp->pp_proc = bp->b_proc;
68#endif
69 TAILQ_INSERT_TAIL(&physio_proc_busyt, pp, pp_chain);
70 splx(s);
71 return pp;
72}
73
74static __inline void
75physio_proc_leave(pp)
76 struct physio_proc *pp;
77{
78 int s;
79
80 if (pp == NULL)
81 return;
82
83 s = splstatclock();
84 TAILQ_REMOVE(&physio_proc_busyt, pp, pp_chain);
85 TAILQ_INSERT_TAIL(&physio_proc_freet, pp, pp_chain);
86 pp->pp_proc = NULL;
87 splx(s);
88}
89
3ae0cd58 90void physio_proc_init (void);
85100692 91#endif /* _MACHINE_PHYSIO_PROC_H_ */