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92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 2000-2002
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char revid[] = "$Id: util_cache.c,v 1.3 2002/04/04 18:50:10 bostic Exp $";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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/*
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* __db_util_cache --
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* Compute if we have enough cache.
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*
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* PUBLIC: int __db_util_cache __P((DB_ENV *, DB *, u_int32_t *, int *));
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*/
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int
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__db_util_cache(dbenv, dbp, cachep, resizep)
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DB_ENV *dbenv;
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DB *dbp;
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u_int32_t *cachep;
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int *resizep;
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{
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DBTYPE type;
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DB_BTREE_STAT *bsp;
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DB_HASH_STAT *hsp;
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DB_QUEUE_STAT *qsp;
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u_int32_t pgsize;
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int ret;
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void *sp;
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/*
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* The current cache size is in cachep. If it's insufficient, set the
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* the memory referenced by resizep to 1 and set cachep to the minimum
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* size needed.
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*/
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if ((ret = dbp->get_type(dbp, &type)) != 0) {
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dbenv->err(dbenv, ret, "DB->get_type");
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return (ret);
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}
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if ((ret = dbp->stat(dbp, &sp, DB_FAST_STAT)) != 0) {
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dbenv->err(dbenv, ret, "DB->stat");
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return (ret);
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}
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switch (type) {
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case DB_QUEUE:
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qsp = (DB_QUEUE_STAT *)sp;
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pgsize = qsp->qs_pagesize;
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break;
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case DB_HASH:
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hsp = (DB_HASH_STAT *)sp;
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pgsize = hsp->hash_pagesize;
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break;
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case DB_BTREE:
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case DB_RECNO:
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bsp = (DB_BTREE_STAT *)sp;
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pgsize = bsp->bt_pagesize;
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break;
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default:
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dbenv->err(dbenv, ret, "unknown database type: %d", type);
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return (EINVAL);
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}
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free(sp);
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/*
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* Make sure our current cache is big enough. We want at least
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* DB_MINPAGECACHE pages in the cache.
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*/
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if ((*cachep / pgsize) < DB_MINPAGECACHE) {
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*resizep = 1;
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*cachep = pgsize * DB_MINPAGECACHE;
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} else
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*resizep = 0;
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return (0);
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}
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