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<h1>Module <a href="type_Netplex_mutex.html">Netplex_mutex</a></h1>
<pre><span id="MODULENetplex_mutex"><span class="keyword">module</span> Netplex_mutex</span>: <code class="code">sig</code> <a href="Netplex_mutex.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Netplex-wide mutexes</p>
</div>
</div>
<hr width="100%">
<p>These are mutexes that work in both multi-processing and
multi-threading netplex environments. They are implemented on top of
<a href="Netplex_semaphore.html"><code class="code">Netplex_semaphore</code></a>, and use the same name space for named objects.</p>
<p>For implementation issues, see <a href="Netplex_semaphore.html"><code class="code">Netplex_semaphore</code></a>.</p>
<p>It is not required to create mutexes: A mutex is automatically created
when the name is used for the first time. Mutexes are initially always
in unlocked state.</p>
<p>Mutexes do not stack: A container cannot lock a mutex several times.
(The second lock attempt would result in a deadlock.)</p>
<p>There is no deadlock detection.</p>
<p>If a container holding mutexes terminates the mutexes are automatically
unlocked.</p>
<p>Mutex are not owned by their container. It is allowed that a different
container unlocks the mutex.</p>
<p>Technically, a mutex named <code class="code">n</code> is implemented by a semaphore <code class="code">n</code>.
If the mutex is locked, the semaphore has the value 0, and if it is
unlocked, it has value 1.</p>
<p><b>Thread safety:</b> Full. The functions can be called from any thread.</p>
<pre><span id="VALplugin"><span class="keyword">val</span> plugin</span> : <code class="type"><a href="Netplex_types.plugin-c.html">Netplex_types.plugin</a></code></pre><div class="info ">
<div class="info-desc">
<p>To enable mutexes, call the controller's <code class="code">add_plugin</code> method
with this object as argument. This can e.g. be done in the
<code class="code">post_add_hook</code> of the processor.</p>
</div>
</div>
<p>The following functions can <b>only</b> be invoked in container
contexts. Outside of such a context the exception
<a href="Netplex_cenv.html#EXCEPTIONNot_in_container_thread"><code class="code">Netplex_cenv.Not_in_container_thread</code></a> is raised.</p>
<pre><span id="TYPEmutex"><span class="keyword">type</span> <code class="type"></code>mutex</span> </pre>
<pre><span id="VALaccess"><span class="keyword">val</span> access</span> : <code class="type">string -> <a href="Netplex_mutex.html#TYPEmutex">mutex</a></code></pre><div class="info ">
<div class="info-desc">
<p>Access the named mutex. If the mutex does not exist, it is created in
unlocked state</p>
</div>
</div>
<pre><span id="VALlock"><span class="keyword">val</span> lock</span> : <code class="type"><a href="Netplex_mutex.html#TYPEmutex">mutex</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Wait until the mutex is free, and locks it</p>
</div>
</div>
<pre><span id="VALunlock"><span class="keyword">val</span> unlock</span> : <code class="type"><a href="Netplex_mutex.html#TYPEmutex">mutex</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Unlocks the mutex. This is a no-op if the mutex is not locked</p>
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