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Account for read-uncommitted cursors in sqlite3BtreeClearTable(). (CVS 2977)

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FossilOrigin-Name: 950798326860de40926e82e10134f09e6ea86245
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danielk1977
2006-01-19 08:43:31 +00:00
parent 191c3e7db0
commit ed4293119a
6 changed files with 122 additions and 22 deletions
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31
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 1.301 2006/01/19 07:18:14 danielk1977 Exp $
** $Id: btree.c,v 1.302 2006/01/19 08:43:31 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -5537,22 +5537,31 @@ int sqlite3BtreeClearTable(Btree *p, int iTable){
int rc;
BtCursor *pCur;
BtShared *pBt = p->pBt;
sqlite3 *db = p->pSqlite;
if( p->inTrans!=TRANS_WRITE ){
return pBt->readOnly ? SQLITE_READONLY : SQLITE_ERROR;
}
for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
if( pCur->pgnoRoot==(Pgno)iTable ){
if( pCur->wrFlag==0 ) return SQLITE_LOCKED;
moveToRoot(pCur);
/* If this connection is not in read-uncommitted mode and currently has
** a read-cursor open on the table being cleared, return SQLITE_LOCKED.
*/
if( 0==db || 0==(db->flags&SQLITE_ReadUncommitted) ){
for(pCur=pBt->pCursor; pCur; pCur=pCur->pNext){
if( pCur->pBtree==p && pCur->pgnoRoot==(Pgno)iTable ){
if( 0==pCur->wrFlag ){
return SQLITE_LOCKED;
}
moveToRoot(pCur);
}
}
}
rc = clearDatabasePage(pBt, (Pgno)iTable, 0, 0);
#if 0
if( rc ){
sqlite3BtreeRollback(pBt);
/* Save the position of all cursors open on this table */
if( SQLITE_OK!=(rc = saveAllCursors(pBt, iTable, 0)) ){
return rc;
}
#endif
return rc;
return clearDatabasePage(pBt, (Pgno)iTable, 0, 0);
}
/*