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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Gettings Things Gnome! - a personal organizer for the GNOME desktop
# Copyright (c) 2008-2009 - Lionel Dricot & Bertrand Rousseau
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
# -----------------------------------------------------------------------------
'''
Utils to stop and quit gracefully a thread, issuing the command from
another one
'''
class Interrupted(Exception):
'''Exception raised when a thread should be interrupted'''
pass
def interruptible(fn):
'''
A decorator that makes a function interruptible. It should be applied only
to the function which is the target of a Thread object.
'''
def new(*args):
try:
return fn(*args)
except Interrupted:
return
return new
def _cancellation_point(test_function):
'''
This function checks a test_function and, if it evaluates to True, makes
the thread quit (similar to pthread_cancel() in C)
It starts with a _ as it's mostly used in a specialized form, as:
cancellation_point = functools.partial(_cancellation_point,
lambda: quit_condition == True)
@param test_function: the function to test before cancelling
'''
if test_function():
raise Interrupted
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