diff -r 000000000000 -r bde4ae8d615e os/persistentdata/persistentstorage/sqlite3api/TEST/TclScript/pcache.test
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/persistentdata/persistentstorage/sqlite3api/TEST/TclScript/pcache.test	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,147 @@
+# 2008 August 29
+#
+# 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.
+#
+#***********************************************************************
+#
+# This file is focused on testing the pcache module.
+#
+# $Id: pcache.test,v 1.2 2008/09/05 05:29:09 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+
+# The pcache module limits the number of pages available to purgeable
+# caches to the sum of the 'cache_size' values for the set of open
+# caches. This block of tests, pcache-1.*, test that the library behaves
+# corrctly when it is forced to exceed this limit.
+#
+do_test pcache-1.1 {
+  db close
+  pcache_stats
+} {current 0 max 0 min 0 recyclable 0}
+
+do_test pcache-1.2 {
+  sqlite3 db test.db
+  execsql {
+    PRAGMA cache_size=10;
+    PRAGMA auto_vacuum=0;
+  }
+  pcache_stats
+} {current 1 max 10 min 10 recyclable 1}
+
+do_test pcache-1.3 {
+  execsql {
+    BEGIN;
+    CREATE TABLE t1(a, b, c);
+    CREATE TABLE t2(a, b, c);
+    CREATE TABLE t3(a, b, c);
+    CREATE TABLE t4(a, b, c);
+    CREATE TABLE t5(a, b, c);
+  }
+  pcache_stats
+} {current 6 max 10 min 10 recyclable 0}
+
+do_test pcache-1.4 {
+  execsql {
+    CREATE TABLE t6(a, b, c);
+    CREATE TABLE t7(a, b, c);
+    CREATE TABLE t8(a, b, c);
+    CREATE TABLE t9(a, b, c);
+  }
+  pcache_stats
+} {current 10 max 10 min 10 recyclable 0}
+
+do_test pcache-1.5 {
+  sqlite3 db2 test.db
+  execsql "PRAGMA cache_size=10" db2
+  pcache_stats
+} {current 11 max 20 min 20 recyclable 1}
+
+do_test pcache-1.6 {
+  execsql {
+    BEGIN;
+    SELECT * FROM sqlite_master;
+  } db2
+  pcache_stats
+} {current 11 max 20 min 20 recyclable 0}
+
+# At this point connection db2 has a read lock on the database file and a 
+# single pinned page in its cache. Connection [db] is holding 10 dirty 
+# pages. It cannot recycle them because of the read lock held by db2.
+#
+do_test pcache-1.6 {
+  execsql {
+    CREATE INDEX i1 ON t1(a, b);
+    CREATE INDEX i2 ON t2(a, b);
+    CREATE INDEX i3 ON t3(a, b);
+    CREATE INDEX i4 ON t4(a, b);
+    CREATE INDEX i5 ON t5(a, b);
+    CREATE INDEX i6 ON t6(a, b);
+    CREATE INDEX i7 ON t7(a, b);
+    CREATE INDEX i8 ON t8(a, b);
+    CREATE INDEX i9 ON t9(a, b);
+  } 
+  pcache_stats
+} {current 20 max 20 min 20 recyclable 0}
+
+do_test pcache-1.7 {
+  execsql {
+    CREATE TABLE t10(a, b, c);
+  } 
+  pcache_stats
+} {current 21 max 20 min 20 recyclable 0}
+
+# Rolling back the transaction held by db2 at this point releases a pinned
+# page. Because the number of allocated pages is greater than the 
+# configured maximum, this page should be freed immediately instead of
+# recycled.
+#
+do_test pcache-1.8 {
+  execsql {ROLLBACK} db2
+  pcache_stats
+} {current 20 max 20 min 20 recyclable 0}
+
+do_test pcache-1.9 {
+  execsql COMMIT
+  pcache_stats
+} {current 20 max 20 min 20 recyclable 20}
+
+do_test pcache-1.10 {
+  db2 close
+  pcache_stats
+} {current 10 max 10 min 10 recyclable 10}
+
+do_test pcache-1.11 {
+  execsql { PRAGMA cache_size = 20 }
+  pcache_stats
+} {current 10 max 20 min 10 recyclable 10}
+
+do_test pcache-1.12 {
+  execsql { 
+    SELECT * FROM t1 ORDER BY a; SELECT * FROM t1;
+    SELECT * FROM t2 ORDER BY a; SELECT * FROM t2;
+    SELECT * FROM t3 ORDER BY a; SELECT * FROM t3;
+    SELECT * FROM t4 ORDER BY a; SELECT * FROM t4;
+    SELECT * FROM t5 ORDER BY a; SELECT * FROM t5;
+    SELECT * FROM t6 ORDER BY a; SELECT * FROM t6;
+    SELECT * FROM t7 ORDER BY a; SELECT * FROM t7;
+    SELECT * FROM t8 ORDER BY a; SELECT * FROM t8;
+    SELECT * FROM t9 ORDER BY a; SELECT * FROM t9;
+  }
+  pcache_stats
+} {current 19 max 20 min 10 recyclable 19}
+
+do_test pcache-1.13 {
+  execsql { PRAGMA cache_size = 15 }
+  pcache_stats
+} {current 15 max 15 min 10 recyclable 15}
+
+finish_test
+