+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*-
- * Copyright (c) 1991, 1993
- * 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 8.1 (Berkeley) 6/2/93
- */
-
-/*
- * The memory pool scheme is a simple one. Each in memory page is referenced
- * by a bucket which is threaded in three ways. All active pages are threaded
- * on a hash chain (hashed by the page number) and an lru chain. Inactive
- * pages are threaded on a free chain. Each reference to a memory pool is
- * handed an MPOOL which is the opaque cookie passed to all of the memory
- * routines.
- */
-#define HASHSIZE 128
-#define HASHKEY(pgno) ((pgno - 1) % HASHSIZE)
-
-/* The BKT structures are the elements of the lists. */
-typedef struct BKT {
- struct BKT *hnext; /* next hash bucket */
- struct BKT *hprev; /* previous hash bucket */
- struct BKT *cnext; /* next free/lru bucket */
- struct BKT *cprev; /* previous free/lru bucket */
- 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 */
- unsigned long flags; /* flags */
-} BKT;
-
-/* The BKTHDR structures are the heads of the lists. */
-typedef struct BKTHDR {
- struct BKT *hnext; /* next hash bucket */
- struct BKT *hprev; /* previous hash bucket */
- struct BKT *cnext; /* next free/lru bucket */
- struct BKT *cprev; /* previous free/lru bucket */
-} BKTHDR;
-
-typedef struct MPOOL {
- BKTHDR free; /* The free list. */
- BKTHDR lru; /* The LRU list. */
- BKTHDR hashtable[HASHSIZE]; /* Hashed list by page number. */
- 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
- 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;
-
-#ifdef __MPOOLINTERFACE_PRIVATE
-/* Macros to insert/delete into/from hash chain. */
-#define rmhash(bp) { \
- (bp)->hprev->hnext = (bp)->hnext; \
- (bp)->hnext->hprev = (bp)->hprev; \
-}
-#define inshash(bp, pg) { \
- hp = &mp->hashtable[HASHKEY(pg)]; \
- (bp)->hnext = hp->hnext; \
- (bp)->hprev = (struct BKT *)hp; \
- hp->hnext->hprev = (bp); \
- hp->hnext = (bp); \
-}
-
-/* Macros to insert/delete into/from lru and free chains. */
-#define rmchain(bp) { \
- (bp)->cprev->cnext = (bp)->cnext; \
- (bp)->cnext->cprev = (bp)->cprev; \
-}
-#define inschain(bp, dp) { \
- (bp)->cnext = (dp)->cnext; \
- (bp)->cprev = (struct BKT *)(dp); \
- (dp)->cnext->cprev = (bp); \
- (dp)->cnext = (bp); \
-}
-#endif
-
-__BEGIN_DECLS
-MPOOL *mpool_open __P((DBT *, 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 *));
-void *mpool_get __P((MPOOL *, pgno_t, u_int));
-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
projects / apple / xnu.git / blobdiff