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Changes to insure that lookaside memory allocations are never used to hold

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schema content.
Ticket #3743. (CVS 6377)

FossilOrigin-Name: ea74d8dc62f5784089aa8ef098e97c505a79b176
This commit is contained in:
drh
2009-03-24 15:08:09 +00:00
parent 4be6469146
commit d9da78a2c8
19 changed files with 139 additions and 118 deletions
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15
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.845 2009/03/23 04:33:33 danielk1977 Exp $
** @(#) $Id: sqliteInt.h,v 1.846 2009/03/24 15:08:10 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -686,10 +686,17 @@ struct Schema {
** lookaside malloc subsystem. Each available memory allocation in
** the lookaside subsystem is stored on a linked list of LookasideSlot
** objects.
**
** Lookaside allocations are only allowed for objects that are associated
** with a particular database connection. Hence, schema information cannot
** be stored in lookaside because in shared cache mode the schema information
** is shared by multiple database connections. Therefore, while parsing
** schema information, the Lookaside.bEnabled flag is cleared so that
** lookaside allocations are not used to construct the schema objects.
*/
struct Lookaside {
u16 sz; /* Size of each buffer in bytes */
u8 bEnabled; /* True if use lookaside. False to ignore it */
u8 bEnabled; /* False to disable new lookaside allocations */
u8 bMalloced; /* True if pStart obtained from sqlite3_malloc() */
int nOut; /* Number of buffers currently checked out */
int mxOut; /* Highwater mark for nOut */
@@ -1105,7 +1112,7 @@ struct CollSeq {
** of a SELECT statement.
*/
struct Table {
sqlite3 *db; /* Associated database connection. Might be NULL. */
sqlite3 *dbMem; /* DB connection used for lookaside allocations. */
char *zName; /* Name of the table or view */
int iPKey; /* If not negative, use aCol[iPKey] as the primary key */
int nCol; /* Number of columns in this table */
@@ -2466,7 +2473,7 @@ void sqlite3CompleteInsertion(Parse*, Table*, int, int, int*, int, int, int);
int sqlite3OpenTableAndIndices(Parse*, Table*, int, int);
void sqlite3BeginWriteOperation(Parse*, int, int);
Expr *sqlite3ExprDup(sqlite3*,Expr*,int);
void sqlite3TokenCopy(sqlite3*,Token*, Token*);
void sqlite3TokenCopy(sqlite3*,Token*,const Token*);
ExprList *sqlite3ExprListDup(sqlite3*,ExprList*,int);
SrcList *sqlite3SrcListDup(sqlite3*,SrcList*,int);
IdList *sqlite3IdListDup(sqlite3*,IdList*);