Source code for pypdevs.realtime.threadingGameLoop

# 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.

import pypdevs.accurate_time as time
from threading import Lock

_GLLOCK = Lock()


[docs]class ThreadingGameLoop(object): """ Game loop subsystem for realtime simulation. Time will only progress when a *step* call is made. """
[docs] def __init__(self): """ Constructor """ self.next_event = float('inf')
[docs] def step(self): """ Perform a step in the simulation. Actual processing is done in a seperate thread. """ with _GLLOCK: # Thread-safety if time.time() >= self.next_event: self.next_event = float('inf') getattr(self, "func")()
[docs] def wait(self, delay, func): """ Wait for the specified time, or faster if interrupted :param time: time to wait :param func: the function to call """ self.func = func self.next_event = time.time() + delay
[docs] def interrupt(self): """ Interrupt the waiting thread """ self.next_event = 0