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Diffstat (limited to 'db/mpool.h')
| -rw-r--r-- | db/mpool.h | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/db/mpool.h b/db/mpool.h deleted file mode 100644 index 22c9feabd3..0000000000 --- a/db/mpool.h +++ /dev/null @@ -1,112 +0,0 @@ -/*- - * 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 8.2 (Berkeley) 7/14/94 - */ - -#ifndef _MPOOL_H -#define _MPOOL_H 1 - -#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 */ - 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) __PMT((void *, pgno_t, void *)); - /* page out conversion routine */ - void (*pgout) __PMT((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; - -__BEGIN_DECLS -MPOOL *__mpool_open __P((void *, int, pgno_t, pgno_t)); -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_filter __P((MPOOL *, void (*)(void *, pgno_t, void *), - void (*)(void *, pgno_t, void *), void *)); -void *__mpool_new __P((MPOOL *, pgno_t *)); -void *mpool_new __P((MPOOL *, pgno_t *)); -void *__mpool_get __P((MPOOL *, pgno_t, u_int)); -void *mpool_get __P((MPOOL *, pgno_t, u_int)); -int __mpool_put __P((MPOOL *, void *, u_int)); -int mpool_put __P((MPOOL *, void *, u_int)); -int __mpool_sync __P((MPOOL *)); -int mpool_sync __P((MPOOL *)); -int __mpool_close __P((MPOOL *)); -int mpool_close __P((MPOOL *)); -#ifdef STATISTICS -void mpool_stat __P((MPOOL *)); -#endif -__END_DECLS - -#endif /* mpool.h */ |