90 lines
3.4 KiB
Python
90 lines
3.4 KiB
Python
# Copyright 2014 Modelling, Simulation and Design Lab (MSDL) at
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# McGill University and the University of Antwerp (http://msdl.cs.mcgill.ca/)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import threading
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class ThreadingBackend(object):
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"""
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Wrapper around the actual threading backend. It will also handle interrupts and the passing of them to the calling thread.
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"""
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def __init__(self, subsystem, args):
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"""
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Constructor
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:param subsystem: string specifying the subsystem to use: python, tkinter or loop
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:param args: all additional arguments that should be passed to the subsystem's constructor (must be a list)
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"""
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self.interrupted_value = None
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self.value_lock = threading.Lock()
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if subsystem == "python":
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from pypdevs.realtime.threadingPython import ThreadingPython
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self.subsystem = ThreadingPython(*args)
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elif subsystem == "tkinter":
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from pypdevs.realtime.threadingTkInter import ThreadingTkInter
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self.subsystem = ThreadingTkInter(*args)
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elif subsystem == "loop":
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from pypdevs.realtime.threadingGameLoop import ThreadingGameLoop
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self.subsystem = ThreadingGameLoop(*args)
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else:
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raise Exception("Realtime subsystem not found: " + str(subsystem))
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def wait(self, time, func):
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"""
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A non-blocking call, which will call the *func* parameter after *time* seconds. It will use the provided backend to do this.
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:param time: time to wait in seconds, a float is possible
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:param func: the function to call after the time has passed
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"""
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self.subsystem.wait(time, func)
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def interrupt(self, value):
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"""
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Interrupt a running wait call.
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:param value: the value that interrupts
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"""
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self.interrupted_value = value
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self.subsystem.interrupt()
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def setInterrupt(self, value):
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"""
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Sets the value of the interrupt. This should not be used manually and is only required to prevent the asynchronous combo generator from making *interrrupt()* calls.
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:param value: value with which the interrupt variable should be set
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"""
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with self.value_lock:
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if self.interrupted_value is None:
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self.interrupted_value = value
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return True
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else:
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# The interrupt was already set, indicating a collision!
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return False
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def getInterrupt(self):
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"""
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Return the value of the interrupt and clear it internally.
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:returns: the interrupt
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"""
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with self.value_lock:
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val = self.interrupted_value
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self.interrupted_value = None
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return val
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def step(self):
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"""
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Perform a step in the backend; only supported for the game loop backend.
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"""
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self.subsystem.step()
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