Source code for pypdevs.realtime.threadingPython

# Copyright 2014 Modelling, Simulation and Design Lab (MSDL) at 
# McGill University and the University of Antwerp (http://msdl.cs.mcgill.ca/)
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from threading import Event, Thread, Lock
import pypdevs.accurate_time as time
from pypdevs.infinity import INFINITY

[docs]class ThreadingPython(object): """ Simple Python threads subsystem """
[docs] def __init__(self): """ Constructor """ self.evt = Event() self.evt_lock = Lock()
[docs] def wait(self, delay, func): """ Wait for the specified time, or faster if interrupted :param delay: time to wait :param func: the function to call """ if delay == INFINITY: return #NOTE this call has a granularity of 5ms in Python <= 2.7.x in the worst case, so beware! # the granularity seems to be much better in Python >= 3.x p = Thread(target=ThreadingPython.callFunc, args=[self, delay, func]) p.daemon = True p.start()
[docs] def interrupt(self): """ Interrupt the waiting thread """ self.evt.set()
[docs] def callFunc(self, delay, func): """ Function to call on a seperate thread: will block for the specified time and call the function afterwards """ with self.evt_lock: self.evt.wait(delay) func() self.evt.clear()