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'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">"""</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">"""Create a new mutex -- initially unlocked."""</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">"""Test the locked bit of the mutex."""</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">"""Atomic test-and-set -- grab the lock if it is not set,</span> <span class="hl str"> return true if it succeeded."""</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">"""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."""</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">"""Unlock a mutex. If the queue is not empty, call the next</span> <span class="hl str"> function with its argument."""</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> </code></pre></td></tr></table> </div> <!-- class=content --> <div class='footer'>generated by <a href='http://git.zx2c4.com/cgit/about/'>cgit v0.12</a> at 2025-02-28 00:05:10 (GMT)</div> </div> <!-- id=cgit --> </body> </html>