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# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
from _emerge.AsynchronousTask import AsynchronousTask
from _emerge.PollConstants import PollConstants
class AbstractPollTask(AsynchronousTask):
__slots__ = ("scheduler",) + \
("_registered",)
_bufsize = 4096
_exceptional_events = PollConstants.POLLERR | PollConstants.POLLNVAL
_registered_events = PollConstants.POLLIN | PollConstants.POLLHUP | \
_exceptional_events
def _unregister(self):
raise NotImplementedError(self)
def _unregister_if_appropriate(self, event):
if self._registered:
if event & self._exceptional_events:
self._unregister()
self.cancel()
elif event & PollConstants.POLLHUP:
self._unregister()
self.wait()
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