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Always enable exclusive access mode for TEMP databases. This cannot be

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changed.  The locking_mode pragma has not effect on the TEMP database. (CVS 3766)

FossilOrigin-Name: 04d3b9098ed06d5be24253edde50ea61b4641df8
This commit is contained in:
drh
2007-03-30 16:01:55 +00:00
parent 9bb8aecc35
commit 369339db34
5 changed files with 60 additions and 35 deletions
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33
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 1.308 2007/03/30 14:46:01 drh Exp $
** @(#) $Id: pager.c,v 1.309 2007/03/30 16:01:55 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
@@ -85,21 +85,24 @@
** PAGER_SYNCED The pager moves to this state from PAGER_EXCLUSIVE
** after all dirty pages have been written to the
** database file and the file has been synced to
** disk. All that remains to do is to remove the
** journal file and the transaction will be
** committed.
** disk. All that remains to do is to remove or
** truncate the journal file and the transaction
** will be committed.
**
** The page cache comes up in PAGER_UNLOCK. The first time a
** sqlite3PagerGet() occurs, the state transitions to PAGER_SHARED.
** After all pages have been released using sqlite_page_unref(),
** the state transitions back to PAGER_UNLOCK. The first time
** that sqlite3PagerWrite() is called, the state transitions to
** PAGER_RESERVED. (Note that sqlite_page_write() can only be
** PAGER_RESERVED. (Note that sqlite3PagerWrite() can only be
** called on an outstanding page which means that the pager must
** be in PAGER_SHARED before it transitions to PAGER_RESERVED.)
** The transition to PAGER_EXCLUSIVE occurs when before any changes
** are made to the database file. After an sqlite3PagerRollback()
** or sqlite_pager_commit(), the state goes back to PAGER_SHARED.
** PAGER_RESERVED means that there is an open rollback journal.
** The transition to PAGER_EXCLUSIVE occurs before any changes
** are made to the database file, though writes to the rollback
** journal occurs with just PAGER_RESERVED. After an sqlite3PagerRollback()
** or sqlite3PagerCommitPhaseTwo(), the state can go back to PAGER_SHARED,
** or it can stay at PAGER_EXCLUSIVE if we are in exclusive access mode.
*/
#define PAGER_UNLOCK 0
#define PAGER_SHARED 1 /* same as SHARED_LOCK */
@@ -1781,6 +1784,10 @@ int sqlite3PagerOpen(
/* pPager->state = PAGER_UNLOCK; */
/* pPager->errMask = 0; */
pPager->tempFile = tempFile;
assert( tempFile==PAGER_LOCKINGMODE_NORMAL
|| tempFile==PAGER_LOCKINGMODE_EXCLUSIVE );
assert( PAGER_LOCKINGMODE_EXCLUSIVE==1 );
pPager->exclusiveMode = tempFile;
pPager->memDb = memDb;
pPager->readOnly = readOnly;
/* pPager->needSync = 0; */
@@ -3192,12 +3199,13 @@ int sqlite3PagerBegin(DbPage *pPg, int exFlag){
*/
assert( pPager->nRec==0 );
assert( pPager->origDbSize==0 );
assert( pPager->aInJournal==0 );
sqlite3PagerPagecount(pPager);
pPager->origDbSize = pPager->dbSize;
pPager->aInJournal = sqliteMalloc( pPager->dbSize/8 + 1 );
if( !pPager->aInJournal ){
rc = SQLITE_NOMEM;
}else{
pPager->origDbSize = pPager->dbSize;
rc = writeJournalHdr(pPager);
}
}
@@ -4173,7 +4181,12 @@ void *sqlite3PagerGetExtra(DbPage *pPg){
** locking-mode.
*/
int sqlite3PagerLockingMode(Pager *pPager, int eMode){
if( eMode>=0 ){
assert( eMode==PAGER_LOCKINGMODE_QUERY
|| eMode==PAGER_LOCKINGMODE_NORMAL
|| eMode==PAGER_LOCKINGMODE_EXCLUSIVE );
assert( PAGER_LOCKINGMODE_QUERY<0 );
assert( PAGER_LOCKINGMODE_NORMAL>=0 && PAGER_LOCKINGMODE_EXCLUSIVE>=0 );
if( eMode>=0 && !pPager->tempFile ){
pPager->exclusiveMode = eMode;
}
return (int)pPager->exclusiveMode;