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104 lines
2.9 KiB
Python
104 lines
2.9 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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Simple decorators (usable in Python >= 2.4).
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Example:
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@synchronized(thread.allocate_lock())
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def f ():
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"Synchronized function"
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print "i am synchronized:", f, f.__doc__
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@deprecated
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def g ():
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"this function is deprecated"
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pass
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"""
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import warnings
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import signal
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import os
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def deprecated (func):
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"""
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A decorator which can be used to mark functions as deprecated.
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It emits a warning when the function is called.
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"""
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def newfunc (*args, **kwargs):
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"""
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Print deprecated warning and execute original function.
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"""
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warnings.warn("Call to deprecated function %s." % func.__name__,
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category=DeprecationWarning)
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return func(*args, **kwargs)
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newfunc.__name__ = func.__name__
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newfunc.__doc__ = func.__doc__
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newfunc.__dict__.update(func.__dict__)
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return newfunc
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def signal_handler (signal_number):
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"""
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A decorator to set the specified function as handler for a signal.
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This function is the 'outer' decorator, called with only the
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(non-function) arguments.
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From http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/410666
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"""
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# create the 'real' decorator which takes only a function as an argument
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def newfunc (function):
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"""
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Register function as signal handler.
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"""
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if os.name == 'posix':
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signal.signal(signal_number, function)
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return function
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return newfunc
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def _synchronized (lock, func):
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"""
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Call function with aqcuired lock.
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"""
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def newfunc (*args, **kwargs):
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"""
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Execute function synchronized.
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"""
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lock.acquire(True) # blocking
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try:
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return func(*args, **kwargs)
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finally:
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lock.release()
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newfunc.__name__ = func.__name__
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newfunc.__doc__ = func.__doc__
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newfunc.__dict__.update(func.__dict__)
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return newfunc
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def synchronized (lock):
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"""
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A decorator calling a function with aqcuired lock.
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"""
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def newfunc (function):
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"""
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Execute function synchronized.
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"""
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return _synchronized(lock, function)
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return newfunc
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