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# Copyright (C) 2011 One Laptop per Child
#
# 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 ofwa
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
import os
def marker():
""" filesystem path of per-process inhibit file """
return os.path.join('/var/run/powerd-inhibit-suspend', str(os.getpid()))
class Suspend():
""" control of powerd idle suspend,
reference counted,
does nothing if powerd is not present """
def __init__(self):
self.references = 0
def inhibit(self):
""" inhibit suspend for this process """
if self.references == 0:
try:
file(marker(), 'w').write('')
except:
return
self.references += 1
def uninhibit(self):
""" uninhibit suspend for this process """
self.references -= 1
if self.references > 0:
return
try:
os.remove(marker())
except:
pass
self.references = 0
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