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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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34
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.90 2003/04/25 03:13:25 drh Exp $
** $Id: btree.c,v 1.91 2003/04/25 13:22:52 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -3490,10 +3490,34 @@ static const char *fileBtreeGetFilename(Btree *pBt){
}
/*
** Change the name of the underlying database file.
** Copy the complete content of pBtFrom into pBtTo. A transaction
** must be active for both files.
**
** The size of file pBtFrom may be reduced by this operation.
** If anything goes wrong, the transaction on pBtFrom is rolled back.
*/
static int fileBtreeChangeFilename(Btree *pBt, const char *zNew){
return sqlitepager_rename(pBt->pPager, zNew);
static int fileBtreeCopyFile(Btree *pBtTo, Btree *pBtFrom){
int rc = SQLITE_OK;
Pgno i, nPage;
if( !pBtTo->inTrans || !pBtFrom->inTrans ) return SQLITE_ERROR;
if( pBtTo->needSwab!=pBtFrom->needSwab ) return SQLITE_ERROR;
if( pBtTo->pCursor ) return SQLITE_BUSY;
memcpy(pBtTo->page1, pBtFrom->page1, SQLITE_PAGE_SIZE);
sqlitepager_overwrite(pBtTo->pPager, 1, pBtFrom->page1);
nPage = sqlitepager_pagecount(pBtFrom->pPager);
for(i=2; i<=nPage; i++){
void *pPage;
rc = sqlitepager_get(pBtFrom->pPager, i, &pPage);
if( rc ) break;
sqlitepager_overwrite(pBtTo->pPager, i, pPage);
sqlitepager_unref(pPage);
}
if( !rc ) rc = sqlitepager_truncate(pBtTo->pPager, nPage);
if( rc ){
fileBtreeRollback(pBtTo);
}
return rc;
}
/*
@@ -3521,7 +3545,7 @@ static BtOps sqliteBtreeOps = {
fileBtreeUpdateMeta,
fileBtreeIntegrityCheck,
fileBtreeGetFilename,
fileBtreeChangeFilename,
fileBtreeCopyFile,
#ifdef SQLITE_TEST
fileBtreePageDump,
fileBtreePager