104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/* $NetBSD: mpool.h,v 1.13 2008/08/26 21:18:38 joerg 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. 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 8.2 (Berkeley) 7/14/94
|
|
*/
|
|
|
|
#ifndef _MPOOL_H_
|
|
#define _MPOOL_H_
|
|
|
|
#include <sys/cdefs.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)
|
|
|
|
/* 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 */
|
|
uint8_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 */
|
|
unsigned long pagesize; /* file page size */
|
|
int fd; /* file descriptor */
|
|
/* page in conversion routine */
|
|
void (*pgin)(void *, pgno_t, void *);
|
|
/* page out conversion routine */
|
|
void (*pgout)(void *, pgno_t, void *);
|
|
void *pgcookie; /* cookie for page in/out routines */
|
|
#ifdef STATISTICS
|
|
unsigned long cachehit;
|
|
unsigned long cachemiss;
|
|
unsigned long pagealloc;
|
|
unsigned long pageflush;
|
|
unsigned long pageget;
|
|
unsigned long pagenew;
|
|
unsigned long pageput;
|
|
unsigned long pageread;
|
|
unsigned long pagewrite;
|
|
#endif
|
|
} MPOOL;
|
|
|
|
__BEGIN_DECLS
|
|
MPOOL *mpool_open(void *, int, pgno_t, pgno_t);
|
|
void mpool_filter(MPOOL *, void (*)(void *, pgno_t, void *),
|
|
void (*)(void *, pgno_t, void *), void *);
|
|
void *mpool_new(MPOOL *, pgno_t *);
|
|
void *mpool_get(MPOOL *, pgno_t, unsigned int);
|
|
int mpool_put(MPOOL *, void *, unsigned int);
|
|
int mpool_sync(MPOOL *);
|
|
int mpool_close(MPOOL *);
|
|
#ifdef STATISTICS
|
|
void mpool_stat(MPOOL *);
|
|
#endif
|
|
__END_DECLS
|
|
|
|
#endif /* _MPOOL_H_ */
|