SQLite

/*
** 2004 April 6
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.298 2006/01/15 11:39:18 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
**
**     Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3:
**     "Sorting And Searching", pages 473-480. Addison-Wesley
**     Publishing Company, Reading, Massachusetts.

    BtCursor *pTmp = pCur;
    pCur = pCur->pNext;
    if( pTmp->pBtree==p ){
      sqlite3BtreeCloseCursor(pTmp);
    }
  }

  /* Rollback any active transaction and free the handle structure */
  sqlite3BtreeRollback(p);
  sqliteFree(p);

#ifndef SQLITE_OMIT_SHARED_CACHE
  /* If there are still other outstanding references to the shared-btree
  ** structure, return now. The remainder of this procedure cleans 
  ** up the shared-btree.
  */

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.171 2006/01/15 11:39:18 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <stdarg.h>
#include <ctype.h>

/*

#ifndef NDEBUG
/*
** This function sets a flag in the thread-specific-data structure that will
** cause an assert to fail if sqliteMalloc() or sqliteRealloc() is called.
*/
void sqlite3MallocDisallow(){
  assert( sqlite3ThreadData()->mallocDisallowed>=0 );
  sqlite3ThreadData()->mallocDisallowed++;
}

/*
** This function clears the flag set in the thread-specific-data structure set
** by sqlite3MallocDisallow().
*/
void sqlite3MallocAllow(){
  assert( sqlite3ThreadData()->mallocDisallowed>0 );
  sqlite3ThreadData()->mallocDisallowed--;
}
#endif

# 2005 December 30
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# $Id: shared.test,v 1.13 2006/01/15 11:39:18 danielk1977 Exp $

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

ifcapable !shared_cache {
  finish_test

} {1 2 3}
do_test shared-9.3 {
  db close
  db2 close
} {}

} ; # End shared-9.*

#---------------------------------------------------------------------------
# The following tests - shared-10.* - test that the library behaves 
# correctly when a connection to a shared-cache is closed. 
#
do_test shared-10.1 {
  # Create a small sample database with two connections to it (db and db2).
  file delete -force test.db
  sqlite3 db  test.db
  sqlite3 db2 test.db
  execsql {
    CREATE TABLE ab(a PRIMARY KEY, b);
    CREATE TABLE de(d PRIMARY KEY, e);
    INSERT INTO ab VALUES('Chiang Mai', 100000);
    INSERT INTO ab VALUES('Bangkok', 8000000);
    INSERT INTO de VALUES('Ubon', 120000);
    INSERT INTO de VALUES('Khon Kaen', 200000);
  }
} {}
do_test shared-10.2 {
  # Open a read-transaction with the first connection, a write-transaction
  # with the second.
  execsql {
    BEGIN;
    SELECT * FROM ab;
  }
  execsql {
    BEGIN;
    INSERT INTO de VALUES('Pataya', 30000);
  } db2
} {}
do_test shared-10.3 {
  # An external connection should be able to read the database, but not
  # prepare a write operation.
  sqlite3 db3 ./test.db
  execsql {
    SELECT * FROM ab;
  } db3
  catchsql {
    BEGIN;
    INSERT INTO de VALUES('Pataya', 30000);
  } db3
} {1 {database is locked}}
do_test shared-10.4 {
  # Close the connection with the write-transaction open
  db2 close
} {}
do_test shared-10.5 {
  # Test that the db2 transaction has been automatically rolled back.
  # If it has not the ('Pataya', 30000) entry will still be in the table.
  execsql {
    SELECT * FROM de;
  }
} {Ubon 120000 {Khon Kaen} 200000}
do_test shared-10.5 {
  # Closing db2 should have dropped the shared-cache back to a read-lock.
  # So db3 should be able to prepare a write...
  catchsql {INSERT INTO de VALUES('Pataya', 30000);} db3
} {0 {}}
do_test shared-10.6 {
  # ... but not commit it.
  catchsql {COMMIT} db3
} {1 {database is locked}}
do_test shared-10.7 {
  # Commit the (read-only) db transaction. Check via db3 to make sure the 
  # contents of table "de" are still as they should be.
  execsql {
    COMMIT;
  }
  execsql {
    SELECT * FROM de;
  } db3
} {Ubon 120000 {Khon Kaen} 200000 Pataya 30000}
do_test shared-10.9 {
  # Commit the external transaction.
  catchsql {COMMIT} db3
} {0 {}}
integrity_check shared-10.10
do_test shared-10.11 {
  db close
  db3 close
} {}

finish_test
sqlite3_enable_shared_cache $::enable_shared_cache