/usr/lib/python3/dist-packages/pymeasure/process.py is in python3-pymeasure 0.5-1.
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# This file is part of the PyMeasure package.
#
# Copyright (c) 2013-2017 PyMeasure Developers
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import logging
from multiprocessing import get_context
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
context = get_context()
# Useful for multiprocessing debugging:
# context.log_to_stderr(logging.DEBUG)
class StoppableProcess(context.Process):
""" Base class for Processes which require the ability
to be stopped by a process-safe method call
"""
def __init__(self):
super().__init__()
self._should_stop = context.Event()
self._should_stop.clear()
def join(self, timeout=0):
""" Joins the current process and forces it to stop after
the timeout if necessary
:param timeout: Timeout duration in seconds
"""
self._should_stop.wait(timeout)
if not self.should_stop():
self.stop()
return super().join(0)
def stop(self):
self._should_stop.set()
def should_stop(self):
return self._should_stop.is_set()
def __repr__(self):
return "<%s(should_stop=%s)>" % (
self.__class__.__name__, self.should_stop())
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