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'''Enhanced Thread with support for return values and exception propagation.'''
# Copyright (C) 2007 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
#
# 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 2 of the License, or (at your
# option) any later version. See http://www.gnu.org/copyleft/gpl.html for
# the full text of the license.
import threading, sys
class REThread(threading.Thread):
'''Thread with return values and exception propagation.'''
def __init__(self, group=None, target=None, name=None, args=(), kwargs={}):
'''Initialize Thread, identical to threading.Thread.__init__().'''
threading.Thread.__init__(self, group, target, name, args, kwargs)
self.__target = target
self.__args = args
self.__kwargs = kwargs
self._retval = None
self._exception = None
def run(self):
'''Run target function, identical to threading.Thread.run().'''
if self.__target:
try:
self._retval = self.__target(*self.__args, **self.__kwargs)
except:
if sys:
self._exception = sys.exc_info()
def return_value(self):
'''Return value from target function.
This can only be called after the thread has finished, i. e. when
is_alive() is False and did not terminate with an exception.
'''
assert not self.is_alive()
assert not self._exception
return self._retval
def exc_info(self):
'''Return (type, value, traceback) of the exception caught in run().'''
return self._exception
def exc_raise(self):
'''Raise the exception caught in the thread.
Do nothing if no exception was caught.
'''
if self._exception:
# there is no syntax which both Python 2 and 3 parse, so we need a
# hack using exec() here
# Python 3:
if sys.version > '3':
raise self._exception[1].with_traceback(self._exception[2])
else:
exec('raise self._exception[0], self._exception[1], self._exception[2]')