python-xlib/Xlib/support/lock.py at 0.25 · python-xlib/python-xlib

44 lines (36 loc) · 1.51 KB

# Xlib.support.lock -- allocate a lock

# This library is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public License

# as published by the Free Software Foundation; either version 2.1

# of the License, or (at your option) any later version.

# This library 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 Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public

# License along with this library; if not, write to the

# Free Software Foundation, Inc.,

# 59 Temple Place,

# Suite 330,

# Boston, MA 02111-1307 USA

class _DummyLock(object):

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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