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/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _KRB5_DB2_MPOOL_MPOOL_H
#define _KRB5_DB2_MPOOL_MPOOL_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef __cplusplus
extern "C" {
#endif
/*
* 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
*/
#include "db-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 */
db_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];
db_pgno_t curcache; /* current number of cached pages */
db_pgno_t maxcache; /* max number of cached pages */
db_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 *, db_pgno_t, void *));
/* page out conversion routine */
void (*pgout) __P((void *, db_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. */
#define mpool_open kdb2_mpool_open
#define mpool_filter kdb2_mpool_filter
#define mpool_new kdb2_mpool_new
#define mpool_get kdb2_mpool_get
#define mpool_delete kdb2_mpool_delete
#define mpool_put kdb2_mpool_put
#define mpool_sync kdb2_mpool_sync
#define mpool_close kdb2_mpool_close
#define mpool_stat kdb2_mpool_stat
__BEGIN_DECLS
MPOOL *mpool_open __P((void *, int, db_pgno_t, db_pgno_t));
void mpool_filter __P((MPOOL *, void (*)(void *, db_pgno_t, void *),
void (*)(void *, db_pgno_t, void *), void *));
void *mpool_new __P((MPOOL *, db_pgno_t *, u_int));
void *mpool_get __P((MPOOL *, db_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
#ifdef __cplusplus
}
#endif
#endif /* !_KRB5_DB2_MPOOL_MPOOL_H */
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