--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/e32test-driver/watchdog.py	Fri Jan 15 09:07:44 2010 +0000
@@ -0,0 +1,46 @@
+#
+# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+# All rights reserved.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+# 
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Implements a 'simple' watchdog built on top of the Timer class from
+# the Threading module.
+# After a specified interval a WatchDog will invoke a specified function.
+# At any point the WatchDog can be Reset, which means the countdown will start from scratch.
+# WatchDogs can also be Started and Stopped.
+# NB the WatchDog has no idea what the function it invokes will do.
+
+import threading
+
+class WatchDog(object):
+    def __init__(self, interval, function):
+        self.interval = interval
+        self.function = function
+        self.Watcher()
+
+    def Watcher(self):
+        self.timerThread = threading.Timer(self.interval, self.function)
+
+    def Start(self):
+        self.timerThread.start()
+
+    def Stop(self):
+        self.timerThread.cancel()
+        
+    def Reset(self):
+        self.Stop()
+        self.Watcher()
+        self.Start()
+