sl@0: # 2007 March 24
sl@0: #
sl@0: # The author disclaims copyright to this source code.  In place of
sl@0: # a legal notice, here is a blessing:
sl@0: #
sl@0: #    May you do good and not evil.
sl@0: #    May you find forgiveness for yourself and forgive others.
sl@0: #    May you share freely, never taking more than you give.
sl@0: #
sl@0: #***********************************************************************
sl@0: #
sl@0: # $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $
sl@0: 
sl@0: set testdir [file dirname $argv0]
sl@0: source $testdir/tester.tcl
sl@0: 
sl@0: ifcapable {!pager_pragmas} {
sl@0:   finish_test
sl@0:   return
sl@0: }
sl@0: sqlite3_soft_heap_limit 0
sl@0: 
sl@0: proc pager_cache_size {db} {
sl@0:   set bt [btree_from_db $db]
sl@0:   db_enter $db
sl@0:   array set stats [btree_pager_stats $bt]
sl@0:   db_leave $db
sl@0:   return $stats(page)
sl@0: }
sl@0: 
sl@0: do_test cache-1.1 {
sl@0:   pager_cache_size db
sl@0: } {0}
sl@0: 
sl@0: do_test cache-1.2 {
sl@0:   execsql {
sl@0:     PRAGMA auto_vacuum=OFF;
sl@0:     CREATE TABLE abc(a, b, c);
sl@0:     INSERT INTO abc VALUES(1, 2, 3);
sl@0:   }
sl@0:   pager_cache_size db
sl@0: } {2}
sl@0: 
sl@0: # At one point, repeatedly locking and unlocking the cache was causing
sl@0: # a resource leak of one page per repetition. The page wasn't actually
sl@0: # leaked, but would not be reused until the pager-cache was full (i.e. 
sl@0: # 2000 pages by default).
sl@0: #
sl@0: # This tests that once the pager-cache is initialised, it can be locked
sl@0: # and unlocked repeatedly without internally allocating any new pages.
sl@0: #
sl@0: set cache_size [pager_cache_size db]
sl@0: for {set ii 0} {$ii < 10} {incr ii} {
sl@0: 
sl@0:   do_test cache-1.3.$ii {
sl@0:     execsql {SELECT * FROM abc}
sl@0:     pager_cache_size db
sl@0:   } $::cache_size
sl@0: 
sl@0: }
sl@0: sqlite3_soft_heap_limit $soft_limit
sl@0: 
sl@0: finish_test