1 # 2007 March 24

     2 #

     3 # The author disclaims copyright to this source code.  In place of

     4 # a legal notice, here is a blessing:

     5 #

     6 #    May you do good and not evil.

     7 #    May you find forgiveness for yourself and forgive others.

     8 #    May you share freely, never taking more than you give.

     9 #

    10 #***********************************************************************

    11 #

    12 # $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $

    13 

    14 set testdir [file dirname $argv0]

    15 source $testdir/tester.tcl

    16 

    17 ifcapable {!pager_pragmas} {

    18   finish_test

    19   return

    20 }

    21 sqlite3_soft_heap_limit 0

    22 

    23 proc pager_cache_size {db} {

    24   set bt [btree_from_db $db]

    25   db_enter $db

    26   array set stats [btree_pager_stats $bt]

    27   db_leave $db

    28   return $stats(page)

    29 }

    30 

    31 do_test cache-1.1 {

    32   pager_cache_size db

    33 } {0}

    34 

    35 do_test cache-1.2 {

    36   execsql {

    37     PRAGMA auto_vacuum=OFF;

    38     CREATE TABLE abc(a, b, c);

    39     INSERT INTO abc VALUES(1, 2, 3);

    40   }

    41   pager_cache_size db

    42 } {2}

    43 

    44 # At one point, repeatedly locking and unlocking the cache was causing

    45 # a resource leak of one page per repetition. The page wasn't actually

    46 # leaked, but would not be reused until the pager-cache was full (i.e. 

    47 # 2000 pages by default).

    48 #

    49 # This tests that once the pager-cache is initialised, it can be locked

    50 # and unlocked repeatedly without internally allocating any new pages.

    51 #

    52 set cache_size [pager_cache_size db]

    53 for {set ii 0} {$ii < 10} {incr ii} {

    54 

    55   do_test cache-1.3.$ii {

    56     execsql {SELECT * FROM abc}

    57     pager_cache_size db

    58   } $::cache_size

    59 

    60 }

    61 sqlite3_soft_heap_limit $soft_limit

    62 

    63 finish_test