SQLite

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.580 2009/04/11 16:27:50 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"

/*
** Macros for troubleshooting.  Normally turned off
*/

      rc = pager_playback_one_page(pPager,1,isUnsync,&pPager->journalOff,0,0);
      if( rc!=SQLITE_OK ){
        if( rc==SQLITE_DONE ){
          rc = SQLITE_OK;
          pPager->journalOff = szJ;
          break;
        }else{
          /* If we are unable to rollback, quit and return the error
          ** code.  This will cause the pager to enter the error state
          ** so that no further harm will be done.  Perhaps the next
          ** process to come along will be able to rollback the database.
          */

          goto end_playback;
        }
      }
    }
  }
  /*NOTREACHED*/
  assert( 0 );

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# 
# This file tests aspects of the malloc failure while parsing
# CREATE TABLE statements in auto_vacuum mode.
#
# $Id: mallocC.test,v 1.10 2009/04/11 16:27:50 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl

# Only run these tests if memory debugging is turned on.
#

sqlite3_extended_result_codes db 1

execsql {
  PRAGMA auto_vacuum=1;
  CREATE TABLE t0(a, b, c);
}

# The number of memory allocation failures is different on 64-bit
# and 32-bit systems due to larger structures on 64-bit systems
# overflowing the lookaside more often.  To debug problems, it is
# sometimes helpful to reduce the size of the lookaside allocation
# blocks.  But this is normally disabled.
#
if {0} {
  db close
  sqlite3_shutdown
  sqlite3_config_lookaside 50 500
  sqlite3_initialize
  autoinstall_test_functions
  sqlite3 db test.db
}

do_mallocC_test 1 -sql {
  BEGIN;
  -- Allocate 32 new root pages. This will exercise the 'extract specific 
  -- page from the freelist' code when in auto-vacuum mode (see the
  -- allocatePage() routine in btree.c).
  CREATE TABLE t1(a UNIQUE, b UNIQUE, c UNIQUE);
  CREATE TABLE t2(a UNIQUE, b UNIQUE, c UNIQUE);