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  <h1>Source code for CBD.realtime.threadingGameLoop</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright 2014 Modelling, Simulation and Design Lab (MSDL) at </span>
<span class="c1"># McGill University and the University of Antwerp (http://msdl.cs.mcgill.ca/)</span>
<span class="c1"># </span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1">#    http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>

<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">accurate_time</span> <span class="k">as</span> <span class="n">time</span>
<span class="kn">from</span> <span class="nn">threading</span> <span class="kn">import</span> <span class="n">Lock</span>

<div class="viewcode-block" id="ThreadingGameLoop"><a class="viewcode-back" href="../../../CBD.realtime.threadingGameLoop.html#CBD.realtime.threadingGameLoop.ThreadingGameLoop">[docs]</a><span class="k">class</span> <span class="nc">ThreadingGameLoop</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Game loop subsystem for realtime simulation.</span>
<span class="sd">    Time will only progress when a :func:`step` call is made.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Constructor</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">next_event</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="s1">&#39;inf&#39;</span><span class="p">)</span>

<div class="viewcode-block" id="ThreadingGameLoop.step"><a class="viewcode-back" href="../../../CBD.realtime.threadingGameLoop.html#CBD.realtime.threadingGameLoop.ThreadingGameLoop.step">[docs]</a>    <span class="k">def</span> <span class="nf">step</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Perform a step in the simulation. Actual processing is done in a seperate thread.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">&gt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_event</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">next_event</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="s1">&#39;inf&#39;</span><span class="p">)</span>
            <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s2">&quot;func&quot;</span><span class="p">)()</span></div>
        
<div class="viewcode-block" id="ThreadingGameLoop.wait"><a class="viewcode-back" href="../../../CBD.realtime.threadingGameLoop.html#CBD.realtime.threadingGameLoop.ThreadingGameLoop.wait">[docs]</a>    <span class="k">def</span> <span class="nf">wait</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">delay</span><span class="p">,</span> <span class="n">func</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Wait for the specified time, or faster if interrupted</span>

<span class="sd">        :param delay: time to wait</span>
<span class="sd">        :param func: the function to call</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">func</span> <span class="o">=</span> <span class="n">func</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">next_event</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">+</span> <span class="n">delay</span></div>
    
<div class="viewcode-block" id="ThreadingGameLoop.interrupt"><a class="viewcode-back" href="../../../CBD.realtime.threadingGameLoop.html#CBD.realtime.threadingGameLoop.ThreadingGameLoop.interrupt">[docs]</a>    <span class="k">def</span> <span class="nf">interrupt</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Interrupt the waiting thread</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">next_event</span> <span class="o">=</span> <span class="mi">0</span></div></div>
</pre></div>

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