Source code for qpageview.locking

# -*- coding: utf-8 -*-
# This file is part of the qpageview package.
# Copyright (c) 2010 - 2019 by Wilbert Berendsen
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
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# of the License, or (at your option) any later version.
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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Manages locking access (across threads) to any object.

Use it for example to lock access to Poppler.Document instances.


import threading
import weakref

_locks = weakref.WeakKeyDictionary()
_lock = threading.RLock()

[docs]def lock(item): """Return a threading.RLock instance for the given item. Use: with lock(document): do_something """ with _lock: try: return _locks[item] except KeyError: res = _locks[item] = threading.RLock() return res