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<td class='lines'><pre><code><span class="hl str">&quot;&quot;&quot;Mutual exclusion -- for use with module sched</span>
<span class="hl str"></span>
<span class="hl str">A mutex has two pieces of state -- a 'locked' bit and a queue.</span>
<span class="hl str">When the mutex is not locked, the queue is empty.</span>
<span class="hl str">Otherwise, the queue contains 0 or more (function, argument) pairs</span>
<span class="hl str">representing functions (or methods) waiting to acquire the lock.</span>
<span class="hl str">When the mutex is unlocked while the queue is not empty,</span>
<span class="hl str">the first queue entry is removed and its function(argument) pair called,</span>
<span class="hl str">implying it now has the lock.</span>
<span class="hl str"></span>
<span class="hl str">Of course, no multi-threading is implied -- hence the funny interface</span>
<span class="hl str">for lock, where a function is called once the lock is aquired.</span>
<span class="hl str">&quot;&quot;&quot;</span>

<span class="hl kwa">class</span> mutex<span class="hl opt">:</span>
    <span class="hl kwa">def</span> <span class="hl kwd">__init__</span><span class="hl opt">(</span>self<span class="hl opt">):</span>
        <span class="hl str">&quot;&quot;&quot;Create a new mutex -- initially unlocked.&quot;&quot;&quot;</span>
        self<span class="hl opt">.</span>locked <span class="hl opt">=</span> <span class="hl num">0</span>
        self<span class="hl opt">.</span>queue <span class="hl opt">= []</span>

    <span class="hl kwa">def</span> <span class="hl kwd">test</span><span class="hl opt">(</span>self<span class="hl opt">):</span>
        <span class="hl str">&quot;&quot;&quot;Test the locked bit of the mutex.&quot;&quot;&quot;</span>
        <span class="hl kwa">return</span> self<span class="hl opt">.</span>locked

    <span class="hl kwa">def</span> <span class="hl kwd">testandset</span><span class="hl opt">(</span>self<span class="hl opt">):</span>
        <span class="hl str">&quot;&quot;&quot;Atomic test-and-set -- grab the lock if it is not set,</span>
<span class="hl str">        return true if it succeeded.&quot;&quot;&quot;</span>
        <span class="hl kwa">if not</span> self<span class="hl opt">.</span>locked<span class="hl opt">:</span>
            self<span class="hl opt">.</span>locked <span class="hl opt">=</span> <span class="hl num">1</span>
            <span class="hl kwa">return</span> <span class="hl num">1</span>
        <span class="hl kwa">else</span><span class="hl opt">:</span>
            <span class="hl kwa">return</span> <span class="hl num">0</span>

    <span class="hl kwa">def</span> <span class="hl kwd">lock</span><span class="hl opt">(</span>self<span class="hl opt">,</span> function<span class="hl opt">,</span> argument<span class="hl opt">):</span>
        <span class="hl str">&quot;&quot;&quot;Lock a mutex, call the function with supplied argument</span>
<span class="hl str">        when it is acquired.  If the mutex is already locked, place</span>
<span class="hl str">        function and argument in the queue.&quot;&quot;&quot;</span>
        <span class="hl kwa">if</span> self<span class="hl opt">.</span><span class="hl kwd">testandset</span><span class="hl opt">():</span>
            <span class="hl kwd">function</span><span class="hl opt">(</span>argument<span class="hl opt">)</span>
        <span class="hl kwa">else</span><span class="hl opt">:</span>
            self<span class="hl opt">.</span>queue<span class="hl opt">.</span><span class="hl kwd">append</span><span class="hl opt">((</span>function<span class="hl opt">,</span> argument<span class="hl opt">))</span>

    <span class="hl kwa">def</span> <span class="hl kwd">unlock</span><span class="hl opt">(</span>self<span class="hl opt">):</span>
        <span class="hl str">&quot;&quot;&quot;Unlock a mutex.  If the queue is not empty, call the next</span>
<span class="hl str">        function with its argument.&quot;&quot;&quot;</span>
        <span class="hl kwa">if</span> self<span class="hl opt">.</span>queue<span class="hl opt">:</span>
            function<span class="hl opt">,</span> argument <span class="hl opt">=</span> self<span class="hl opt">.</span>queue<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">]</span>
            <span class="hl kwa">del</span> self<span class="hl opt">.</span>queue<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">]</span>
            <span class="hl kwd">function</span><span class="hl opt">(</span>argument<span class="hl opt">)</span>
        <span class="hl kwa">else</span><span class="hl opt">:</span>
            self<span class="hl opt">.</span>locked <span class="hl opt">=</span> <span class="hl num">0</span>
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