1 # Copyright 2013 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
5 """WatchdogTimer timeout objects."""
10 class WatchdogTimer(object):
11 """A resetable timeout-based watchdog.
13 This object is threadsafe.
16 def __init__(self, timeout):
17 """Initializes the watchdog.
20 timeout: The timeout in seconds. If timeout is None it will never timeout.
22 self._start_time = time.time()
23 self._timeout = timeout
26 """Resets the timeout countdown."""
27 self._start_time = time.time()
30 """Whether the watchdog has timed out.
33 True if the watchdog has timed out, False otherwise.
35 if self._timeout is None:
37 return time.time() - self._start_time > self._timeout