1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/persistentdata/persistentstorage/sqlite3api/TEST/TclScript/cache.test	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,63 @@
     1.4 +# 2007 March 24
     1.5 +#
     1.6 +# The author disclaims copyright to this source code.  In place of
     1.7 +# a legal notice, here is a blessing:
     1.8 +#
     1.9 +#    May you do good and not evil.
    1.10 +#    May you find forgiveness for yourself and forgive others.
    1.11 +#    May you share freely, never taking more than you give.
    1.12 +#
    1.13 +#***********************************************************************
    1.14 +#
    1.15 +# $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $
    1.16 +
    1.17 +set testdir [file dirname $argv0]
    1.18 +source $testdir/tester.tcl
    1.19 +
    1.20 +ifcapable {!pager_pragmas} {
    1.21 +  finish_test
    1.22 +  return
    1.23 +}
    1.24 +sqlite3_soft_heap_limit 0
    1.25 +
    1.26 +proc pager_cache_size {db} {
    1.27 +  set bt [btree_from_db $db]
    1.28 +  db_enter $db
    1.29 +  array set stats [btree_pager_stats $bt]
    1.30 +  db_leave $db
    1.31 +  return $stats(page)
    1.32 +}
    1.33 +
    1.34 +do_test cache-1.1 {
    1.35 +  pager_cache_size db
    1.36 +} {0}
    1.37 +
    1.38 +do_test cache-1.2 {
    1.39 +  execsql {
    1.40 +    PRAGMA auto_vacuum=OFF;
    1.41 +    CREATE TABLE abc(a, b, c);
    1.42 +    INSERT INTO abc VALUES(1, 2, 3);
    1.43 +  }
    1.44 +  pager_cache_size db
    1.45 +} {2}
    1.46 +
    1.47 +# At one point, repeatedly locking and unlocking the cache was causing
    1.48 +# a resource leak of one page per repetition. The page wasn't actually
    1.49 +# leaked, but would not be reused until the pager-cache was full (i.e. 
    1.50 +# 2000 pages by default).
    1.51 +#
    1.52 +# This tests that once the pager-cache is initialised, it can be locked
    1.53 +# and unlocked repeatedly without internally allocating any new pages.
    1.54 +#
    1.55 +set cache_size [pager_cache_size db]
    1.56 +for {set ii 0} {$ii < 10} {incr ii} {
    1.57 +
    1.58 +  do_test cache-1.3.$ii {
    1.59 +    execsql {SELECT * FROM abc}
    1.60 +    pager_cache_size db
    1.61 +  } $::cache_size
    1.62 +
    1.63 +}
    1.64 +sqlite3_soft_heap_limit $soft_limit
    1.65 +
    1.66 +finish_test