Current File : //usr/share/system-config-printer/killtimer.py
#!/usr/bin/python3
## system-config-printer
## Copyright (C) 2010, 2011, 2012, 2013, 2014 Red Hat, Inc.
## Authors:
## Tim Waugh <twaugh@redhat.com>
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 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 General Public License for more details.
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import threading
from gi.repository import GLib
from debug import *
class KillTimer:
def __init__ (self, timeout=30, killfunc=None):
self._timeout = timeout
self._killfunc = killfunc
self._holds = 0
self._add_timeout ()
self._lock = threading.Lock()
def _add_timeout (self):
self._timer = GLib.timeout_add_seconds (self._timeout, self._kill)
def _kill (self):
debugprint ("Timeout (%ds), exiting" % self._timeout)
if self._killfunc:
self._killfunc ()
else:
sys.exit (0)
def add_hold (self):
self._lock.acquire()
if self._holds == 0:
debugprint ("Kill timer stopped")
GLib.source_remove (self._timer)
self._holds += 1
self._lock.release()
def remove_hold (self):
self._lock.acquire()
if self._holds > 0:
self._holds -= 1
if self._holds == 0:
debugprint ("Kill timer started")
self._add_timeout ()
self._lock.release()
def alive (self):
self._lock.acquire()
if self._holds == 0:
GLib.source_remove (self._timer)
self._add_timeout ()
self._lock.release()
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