--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/Scripts/webkitpy/common/thread/messagepump.py	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,59 @@
+# Copyright (c) 2010 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+class MessagePumpDelegate(object):
+    def schedule(self, interval, callback):
+        raise NotImplementedError, "subclasses must implement"
+
+    def message_available(self, message):
+        raise NotImplementedError, "subclasses must implement"
+
+    def final_message_delivered(self):
+        raise NotImplementedError, "subclasses must implement"
+
+
+class MessagePump(object):
+    interval = 10 # seconds
+
+    def __init__(self, delegate, message_queue):
+        self._delegate = delegate
+        self._message_queue = message_queue
+        self._schedule()
+
+    def _schedule(self):
+        self._delegate.schedule(self.interval, self._callback)
+
+    def _callback(self):
+        (messages, is_running) = self._message_queue.take_all()
+        for message in messages:
+            self._delegate.message_available(message)
+        if not is_running:
+            self._delegate.final_message_delivered()
+            return
+        self._schedule()