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Instead of storing a pointer to the parent page in the MemPage structure, have each B-Tree cursor keep track of the ancestry of the current page. (CVS 5747)

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FossilOrigin-Name: 40425e93421286cca1965d7a5769084526210c7a
This commit is contained in:
danielk1977
2008-09-29 11:49:47 +00:00
parent d0507d691e
commit 71d5d2cd49
11 changed files with 340 additions and 414 deletions
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12
src/pcache.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.32 2008/09/24 09:12:47 danielk1977 Exp $
** @(#) $Id: pcache.c,v 1.33 2008/09/29 11:49:48 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -43,7 +43,6 @@ struct PCache {
int szPage; /* Size of every page in this cache */
int szExtra; /* Size of extra space for each page */
int bPurgeable; /* True if pages are on backing store */
void (*xDestroy)(PgHdr*); /* Called when refcnt goes 1->0 */
int (*xStress)(void*,PgHdr*); /* Call to try make a page clean */
void *pStress; /* Argument to xStress */
/**********************************************************************
@@ -643,7 +642,6 @@ void sqlite3PcacheOpen(
int szPage, /* Size of every page */
int szExtra, /* Extra space associated with each page */
int bPurgeable, /* True if pages are on backing store */
void (*xDestroy)(PgHdr*), /* Called to destroy a page */
int (*xStress)(void*,PgHdr*),/* Call to try to make pages clean */
void *pStress, /* Argument to xStress */
PCache *p /* Preallocated space for the PCache */
@@ -653,7 +651,6 @@ void sqlite3PcacheOpen(
p->szPage = szPage;
p->szExtra = szExtra;
p->bPurgeable = bPurgeable;
p->xDestroy = xDestroy;
p->xStress = xStress;
p->pStress = pStress;
p->nMax = 100;
@@ -752,9 +749,6 @@ void sqlite3PcacheRelease(PgHdr *p){
p->nRef--;
if( p->nRef==0 ){
PCache *pCache = p->pCache;
if( p->pCache->xDestroy ){
p->pCache->xDestroy(p);
}
pCache->nRef--;
if( (p->flags&PGHDR_DIRTY)==0 ){
pCache->nPinned--;
@@ -1163,6 +1157,10 @@ int sqlite3PcacheRefCount(PCache *pCache){
return pCache->nRef;
}
int sqlite3PcachePageRefcount(PgHdr *p){
return p->nRef;
}
/*
** Return the total number of pages in the cache.
*/