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Make VACUUM work even if multiple processes have the database open at once. (CVS 933)

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FossilOrigin-Name: caa960289f3d1f5e8f35a94e9e4321996c211ed2
This commit is contained in:
drh
2003-04-25 13:22:51 +00:00
parent fd9903de51
commit f7c5753174
10 changed files with 143 additions and 131 deletions
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61
src/pager.c
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@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.81 2003/04/06 20:52:32 drh Exp $
** @(#) $Id: pager.c,v 1.82 2003/04/25 13:22:53 drh Exp $
*/
#include "os.h" /* Must be first to enable large file support */
#include "sqliteInt.h"
@@ -927,6 +927,28 @@ int sqlitepager_pagecount(Pager *pPager){
return n;
}
/*
** Forward declaration
*/
static int syncAllPages(Pager*);
/*
** Truncate the file to the number of pages specified.
*/
int sqlitepager_truncate(Pager *pPager, Pgno nPage){
int rc;
if( pPager->dbSize<0 ) sqlitepager_pagecount(pPager);
if( nPage>=pPager->dbSize ){
return SQLITE_OK;
}
syncAllPages(pPager);
rc = sqliteOsTruncate(&pPager->fd, SQLITE_PAGE_SIZE*(off_t)nPage);
if( rc==SQLITE_OK ){
pPager->dbSize = nPage;
}
return rc;
}
/*
** Shutdown the page cache. Free all memory and close all files.
**
@@ -2037,43 +2059,6 @@ const char *sqlitepager_filename(Pager *pPager){
return pPager->zFilename;
}
/*
** Rename the database file
*/
int sqlitepager_rename(Pager *pPager, const char *zNewName){
char *zNew;
char *zJournal;
int nName;
int rc;
nName = strlen(zNewName);
zNew = sqliteMalloc( nName*2 + 30 );
if( zNew==0 ){
return SQLITE_NOMEM;
}
memcpy(zNew, zNewName, nName+1);
zJournal = &zNew[nName+1];
memcpy(zJournal, zNew, nName);
strcpy(&zJournal[nName], "-journal");
if( pPager->journalOpen ){
rc = sqliteOsFileRename(pPager->zJournal, zJournal);
if( rc ){
sqliteFree(zNew);
return rc;
}
}
rc = sqliteOsFileRename(pPager->zFilename, zNew);
if( rc ){
sqliteFree(zNew);
return rc;
}
if( pPager->zFilename!=(char*)&pPager[1] ){
sqliteFree(pPager->zFilename);
}
pPager->zFilename = zNew;
return SQLITE_OK;
}
#ifdef SQLITE_TEST
/*
** Print a listing of all referenced pages and their ref count.