database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-07 02:42:48 +03:00
Code Activity

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)

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

14
src/pager.c
View File

@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.495 2008/09/26 21:08:08 drh Exp $
** @(#) $Id: pager.c,v 1.496 2008/09/29 11:49:48 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
@@ -1728,7 +1728,6 @@ int sqlite3PagerOpen(
sqlite3_vfs *pVfs, /* The virtual file system to use */
Pager **ppPager, /* Return the Pager structure here */
const char *zFilename, /* Name of the database file to open */
void (*xDesc)(DbPage*), /* Page destructor function */
int nExtra, /* Extra bytes append to each in-memory page */
int flags, /* flags controlling this file */
int vfsFlags /* flags passed through to sqlite3_vfs.xOpen() */
@@ -1870,7 +1869,7 @@ int sqlite3PagerOpen(
return ((rc==SQLITE_OK)?SQLITE_NOMEM:rc);
}
nExtra = FORCE_ALIGNMENT(nExtra);
sqlite3PcacheOpen(szPageDflt, nExtra, !memDb, xDesc,
sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
!memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
PAGERTRACE3("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename);
@@ -3875,6 +3874,13 @@ int sqlite3PagerRefcount(Pager *pPager){
return sqlite3PcacheRefCount(pPager->pPCache);
}
/*
** Return the number of references to the specified page.
*/
int sqlite3PagerPageRefcount(DbPage *pPage){
return sqlite3PcachePageRefcount(pPage);
}
#ifdef SQLITE_TEST
/*
** This routine is used for testing and analysis only.
@@ -4176,7 +4182,7 @@ int sqlite3PagerMovepage(Pager *pPager, DbPage *pPg, Pgno pgno, int isCommit){
** Return a pointer to the data for the specified page.
*/
void *sqlite3PagerGetData(DbPage *pPg){
assert( pPg->nRef>0 );
assert( pPg->nRef>0 || pPg->pPager->memDb );
return pPg->pData;
}