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882f204319
git-svn-id: https://linkchecker.svn.sourceforge.net/svnroot/linkchecker/trunk/linkchecker@2396 e7d03fd6-7b0d-0410-9947-9c21f3af8025
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2005 Bastian Kleineidam
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program 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. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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"""
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Locking utility class.
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"""
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try:
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import threading
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except ImportError:
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import dummy_threading as threading
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lock_klass = threading.RLock().__class__
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class AssertLock (lock_klass):
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"""
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Lock class asserting that only available locks are acquired,
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and that no lock is released twice.
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"""
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def acquire (self, blocking=True):
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"""
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Acquire lock.
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"""
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assert not self._is_owned(), "deadlock"
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super(AssertLock, self).acquire(blocking=blocking)
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def release (self):
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"""
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Release lock.
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"""
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assert self._is_owned(), "double release"
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super(AssertLock, self).release()
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