-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The 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, QUIET ENJOYMENT 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
+ * 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
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
- * @(#)mpool.h 8.1 (Berkeley) 6/2/93
+ * @(#)mpool.h 8.2 (Berkeley) 7/14/94
+ * $FreeBSD: src/include/mpool.h,v 1.9 2002/03/23 17:24:53 imp Exp $
*/
+#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 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.
+ * 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 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 */
+/* The BKT structures are the elements of the queues. */
+typedef struct _bkt {
+ TAILQ_ENTRY(_bkt) hq; /* hash queue */
+ TAILQ_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 */
- unsigned long flags; /* flags */
+ u_int8_t 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. */
+ TAILQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */
+ /* hash queue array */
+ TAILQ_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;
#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 *));
+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 __P((MPOOL *));
+void mpool_stat(MPOOL *);
#endif
__END_DECLS
+
+#endif
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