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45 lines
1.5 KiB
45 lines
1.5 KiB
2 years ago
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# Xlib.support.lock -- allocate a lock
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#
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# Copyright (C) 2000 Peter Liljenberg <petli@ctrl-c.liu.se>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License
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# as published by the Free Software Foundation; either version 2.1
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# of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc.,
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# 59 Temple Place,
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# Suite 330,
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# Boston, MA 02111-1307 USA
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class _DummyLock(object):
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def __init__(self):
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# This might be nerdy, but by assigning methods like this
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# instead of defining them all, we create a single bound
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# method object once instead of one each time one of the
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# methods is called.
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# This gives some speed improvements which should reduce the
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# impact of the threading infrastructure in the regular code,
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# when not using threading.
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self.acquire = self.release = self.locked = self.__noop
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def __noop(self, *args):
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return
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# More optimisations: we use a single lock for all lock instances
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_dummy_lock = _DummyLock()
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def allocate_lock():
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return _dummy_lock
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