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# -*- test-case-name: twisted._threads.test.test_convenience -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Common functionality used within the implementation of various workers.
"""
from __future__ import absolute_import, division, print_function
from ._ithreads import AlreadyQuit
class Quit(object):
"""
A flag representing whether a worker has been quit.
@ivar isSet: Whether this flag is set.
@type isSet: L{bool}
"""
def __init__(self):
"""
Create a L{Quit} un-set.
"""
self.isSet = False
def set(self):
"""
Set the flag if it has not been set.
@raise AlreadyQuit: If it has been set.
"""
self.check()
self.isSet = True
def check(self):
"""
Check if the flag has been set.
@raise AlreadyQuit: If it has been set.
"""
if self.isSet:
raise AlreadyQuit()
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