1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/* $OpenBSD: mpool.h,v 1.6 1999/02/15 21:17:48 millert Exp $ */
/* $NetBSD: mpool.h,v 1.7 1996/05/03 21:13:41 cgd Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)mpool.h 8.4 (Berkeley) 11/2/95
*/
#ifndef _MPOOL_H_
#define _MPOOL_H_
#include <sys/queue.h>
/*
* The memory pool scheme is a simple one. Each in-memory page is referenced
* by a bucket which is threaded in up to two of three ways. All active pages
* are threaded on a hash chain (hashed by page number) and an lru chain.
* Inactive pages are threaded on a free chain. Each reference to a memory
* pool is handed an opaque MPOOL cookie which stores all of this information.
*/
#define HASHSIZE 128
#define HASHKEY(pgno) ((pgno - 1 + HASHSIZE) % HASHSIZE)
/* The BKT structures are the elements of the queues. */
typedef struct _bkt {
CIRCLEQ_ENTRY(_bkt) hq; /* hash queue */
CIRCLEQ_ENTRY(_bkt) q; /* lru queue */
void *page; /* page */
pgno_t pgno; /* page number */
#define MPOOL_DIRTY 0x01 /* page needs to be written */
#define MPOOL_PINNED 0x02 /* page is pinned into memory */
#define MPOOL_INUSE 0x04 /* page address is valid */
u_int8_t flags; /* flags */
} BKT;
typedef struct MPOOL {
CIRCLEQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */
/* hash queue array */
CIRCLEQ_HEAD(_hqh, _bkt) hqh[HASHSIZE];
pgno_t curcache; /* current number of cached pages */
pgno_t maxcache; /* max number of cached pages */
pgno_t npages; /* number of pages in the file */
u_long pagesize; /* file page size */
int fd; /* file descriptor */
/* page in conversion routine */
void (*pgin) __P((void *, pgno_t, void *));
/* page out conversion routine */
void (*pgout) __P((void *, pgno_t, void *));
void *pgcookie; /* cookie for page in/out routines */
#ifdef STATISTICS
u_long cachehit;
u_long cachemiss;
u_long pagealloc;
u_long pageflush;
u_long pageget;
u_long pagenew;
u_long pageput;
u_long pageread;
u_long pagewrite;
#endif
} MPOOL;
#define MPOOL_IGNOREPIN 0x01 /* Ignore if the page is pinned. */
#define MPOOL_PAGE_REQUEST 0x01 /* Allocate a new page with a
specific page number. */
#define MPOOL_PAGE_NEXT 0x02 /* Allocate a new page with the next
page number. */
__BEGIN_DECLS
MPOOL *mpool_open __P((void *, int, pgno_t, pgno_t));
void mpool_filter __P((MPOOL *, void (*)(void *, pgno_t, void *),
void (*)(void *, pgno_t, void *), void *));
void *mpool_new __P((MPOOL *, pgno_t *, u_int));
void *mpool_get __P((MPOOL *, pgno_t, u_int));
int mpool_delete __P((MPOOL *, void *));
int mpool_put __P((MPOOL *, void *, u_int));
int mpool_sync __P((MPOOL *));
int mpool_close __P((MPOOL *));
#ifdef STATISTICS
void mpool_stat __P((MPOOL *));
#endif
__END_DECLS
#endif
|
