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<h4>Nat!</h4>
<p>Senior Mull</p>
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<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
</div> <!-- contents -->
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<div id="post-second" class="eight columns">
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<h2>De Re mulle-objc <div style="font-size:10px; display: inline-block;">0.50.0</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
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<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
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<article>
<h1>Porting: Synchronized is gone</h1>
<div>
<div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> See <a href="https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html#//apple_ref/doc/uid/10000057i-CH8-SW16">Threading Programming Guide</a> for more information about <tt>@synchronized</tt>.</div>
<h2 id="use-mulle-thread-for-least-hassle">Use mulle-thread for least hassle.</h2>
<p><a href="//github.com/mulle-concurrent/mulle-thread">mulle-thread</a>
is available on all platforms, that run Objective-C.</p>
<p>Use <code class="language-plaintext highlighter-rouge">mulle_thread_mutex_t</code> to transform</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">myFunction</span>
<span class="p">{</span>
<span class="k">@synchronized</span><span class="p">()</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div></div>
<p>to</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">static</span> <span class="n">mulle_thread_mutex_t</span> <span class="n">lock</span><span class="p">;</span>
<span class="k">+</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">load</span>
<span class="p">{</span>
<span class="n">mulle_thread_mutex_init</span><span class="p">(</span> <span class="o">&</span><span class="n">lock</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">+</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">unload</span>
<span class="p">{</span>
<span class="n">mulle_thread_mutex_done</span><span class="p">(</span> <span class="o">&</span><span class="n">lock</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">myFunction</span>
<span class="p">{</span>
<span class="n">mulle_thread_mutex_lock</span><span class="p">(</span> <span class="o">&</span><span class="n">lock</span><span class="p">);</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="n">mulle_thread_mutex_unlock</span><span class="p">(</span> <span class="o">&</span><span class="n">lock</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div></div>
<h2 id="use-nslock-instead">Use NSLock instead</h2>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">static</span> <span class="n">NSLock</span> <span class="n">lock</span><span class="p">;</span>
<span class="k">+</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">initialize</span>
<span class="p">{</span>
<span class="k">if</span><span class="p">(</span> <span class="o">!</span> <span class="n">lock</span><span class="p">)</span>
<span class="n">lock</span> <span class="o">=</span> <span class="p">[</span><span class="n">NSLock</span> <span class="nf">new</span><span class="p">];</span>
<span class="p">}</span>
<span class="k">+</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">deinitialize</span>
<span class="p">{</span>
<span class="k">if</span><span class="p">(</span> <span class="n">lock</span><span class="p">)</span>
<span class="p">{</span>
<span class="p">[</span><span class="n">lock</span> <span class="nf">release</span><span class="p">];</span>
<span class="n">lock</span> <span class="o">=</span> <span class="nb">nil</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">myFunction</span>
<span class="p">{</span>
<span class="p">[</span><span class="n">lock</span> <span class="nf">lock</span><span class="p">];</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="p">[</span><span class="n">lock</span> <span class="nf">unlock</span><span class="p">];</span>
<span class="p">}</span>
</code></pre></div></div>
<h3 id="good-points">Good points</h3>
<ul>
<li>code works in all runtimes without another dependency</li>
<li><code class="language-plaintext highlighter-rouge">+deinitialize</code> will not be called by other runtimes, it’s a harmless addition</li>
</ul>
<h3 id="bad-points">Bad points</h3>
<ul>
<li>A <strong>NSLock</strong> is slower than a <code class="language-plaintext highlighter-rouge">mulle_thread_mutex_t</code></li>
<li>The lock has not become a proper mulle-objc root object, so this code will leak in tests.</li>
</ul>
<p>You could fix this with deleting <code class="language-plaintext highlighter-rouge">+deinitialize</code> and rewriting <code class="language-plaintext highlighter-rouge">+initialize</code> as:</p>
<p>``` objc</p>
<ul>
<li>(void) initialize
{
if( ! lock)
{
lock = [NSLock new];
#ifdef <strong>MULLE_OBJC</strong>
[lock _becomeRootObject];
[lock release;]
#endif
}
}</li>
</ul>
<p>// + (void) deinitialize clashes with _becomeRootObject and must be removed</p>
</div>
</article>
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