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# Xlib.support.lock -- allocate a lock
#
# Copyright (C) 2000 Peter Liljenberg <petli@ctrl-c.liu.se>
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
class _DummyLock:
def __init__(self):
# This might be nerdy, but by assigning methods like this
# instead of defining them all, we create a single bound
# method object once instead of one each time one of the
# methods is called.
# This gives some speed improvements which should reduce the
# impact of the threading infrastructure in the regular code,
# when not using threading.
self.acquire = self.release = self.locked = self.__noop
def __noop(self, *args):
return
# More optimisations: we use a single lock for all lock instances
_dummy_lock = _DummyLock()
def allocate_lock():
return _dummy_lock
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