--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/sqlite3api/TEST/TclScript/lock4.test	Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,115 @@
+# 2007 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.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this script is database locks.
+#
+# $Id: lock4.test,v 1.8 2008/03/14 08:57:42 danielk1977 Exp $
+
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Initialize the test.db database so that it is non-empty
+#
+do_test lock4-1.1 {
+  db eval {
+     PRAGMA auto_vacuum=OFF;
+     CREATE TABLE t1(x);
+  }
+  file delete -force test2.db test2.db-journal
+  sqlite3 db2 test2.db
+  db2 eval {
+     PRAGMA auto_vacuum=OFF;
+     CREATE TABLE t2(x)
+  }
+  db2 close
+  list [file size test.db] [file size test2.db]
+} {2048 2048}
+
+# Create a script to drive a separate process that will
+#
+#     1.  Create a second database test2.db
+#     2.  Get an exclusive lock on test2.db
+#     3.  Add an entry to test.db in table t1, waiting as necessary.
+#     4.  Commit the change to test2.db.
+#
+# Meanwhile, this process will:
+# 
+#     A.  Get an exclusive lock on test.db
+#     B.  Attempt to read from test2.db but get an SQLITE_BUSY error.
+#     C.  Commit the changes to test.db thus alloing the other process
+#         to continue.
+#
+do_test lock4-1.2 {
+ 
+  # Create a script for the second process to run.
+  #
+  set out [open test2-script.tcl w]
+  puts $out "set sqlite_pending_byte [set sqlite_pending_byte]"
+  puts $out {
+     sqlite3 db2 test2.db
+     db2 eval {
+        BEGIN;
+        INSERT INTO t2 VALUES(2);
+     }
+     sqlite3 db test.db
+     db timeout 1000000
+     db eval {
+        INSERT INTO t1 VALUES(2);
+     }
+     db close
+     db2 eval COMMIT
+     exit
+  }
+  close $out
+
+  # Begin a transaction on test.db.
+  db eval {
+     BEGIN EXCLUSIVE;
+     INSERT INTO t1 VALUES(1);
+  }
+
+  # Kick off the second process.
+  exec [info nameofexec] ./test2-script.tcl &
+
+  # Wait until the second process has started its transaction on test2.db.
+  while {![file exists test2.db-journal]} {
+    after 10
+  }
+
+  # Try to write to test2.db. We are locked out.
+  sqlite3 db2 test2.db
+  catchsql {
+    INSERT INTO t2 VALUES(1)
+  } db2
+} {1 {database is locked}}
+do_test lock4-1.3 {
+  db eval {
+     COMMIT;
+  }
+  while {[file exists test2.db-journal]} {
+    after 10
+  }
+  # The other process has committed its transaction on test2.db by 
+  # deleting the journal file. But it might retain the lock for a 
+  # fraction longer 
+  #
+  db2 eval {
+     SELECT * FROM t2
+  }
+} {2}
+
+    
+do_test lock4-999.1 {
+  rename db2 {}
+} {}
+
+finish_test