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<h1>Module <a href="type_Netmcore_mutex.html">Netmcore_mutex</a></h1>
<pre><span id="MODULENetmcore_mutex"><span class="keyword">module</span> Netmcore_mutex</span>: <code class="code">sig</code> <a href="Netmcore_mutex.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Mutexes</p>
</div>
</div>
<hr width="100%">
<p>Mutexes are here defined as values that reside in shared heaps
(<a href="Netmcore_heap.html"><code class="code">Netmcore_heap</code></a>), for example in the header field of
<a href="Netmcore_array.html"><code class="code">Netmcore_array</code></a> or somewhere else in heap-allocated
data structures.</p>
<p>In order to ensure that the mutex is in the heap, the
special function <code class="code">create</code> must be used to initialize it
there. As <code class="code">create</code> requires a mutator as argument, this is
only possible by calling <code class="code">create</code> from the callback of
<a href="Netmcore_heap.html#VALmodify"><code class="code">Netmcore_heap.modify</code></a>.</p>
<p>Mutexes are special values, and cannot be copied or moved.</p>
<p>Mutexes are implemented on top of semaphores. For mutex types with
deadlock handling, the process is considered as the owner, and
process ID is the identifier.</p>
<p>Only mutexes of type <code class="code">`Normal</code> are thread-safe, i.e. can be used
when the worker processes also use threads internally.</p>
<pre><span id="TYPEmutex_type"><span class="keyword">type</span> <code class="type"></code>mutex_type</span> = <code class="type">[ `Errorcheck | `Normal | `Recursive ]</code> </pre>
<div class="info ">
<div class="info-desc">
<p>Types:</p>
<ul>
<li><code class="code">`Normal</code> mutexes have no checks for deadlocks.</li>
<li><code class="code">`Errorcheck</code> mutexes check whether the process locks the mutex
again, and fail in this case. Also, only the owning process can
unlock a mutex.</li>
<li><code class="code">`Recursive</code> mutexes allow that the owner locks several times.
The same number of unlock requests need to be issued to give
up the ownership</li>
</ul>
</div>
</div>
<pre><span id="TYPEmutex"><span class="keyword">type</span> <code class="type"></code>mutex</span> </pre>
<pre><span id="VALdummy"><span class="keyword">val</span> dummy</span> : <code class="type">unit -> <a href="Netmcore_mutex.html#TYPEmutex">mutex</a></code></pre><div class="info ">
<div class="info-desc">
<p>A dummy mutex is non-functional, but can be used to put something
into <code class="code">mutex</code>-typed variables</p>
</div>
</div>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type"><a href="Netmcore_heap.html#TYPEmutator">Netmcore_heap.mutator</a> -> <a href="Netmcore_mutex.html#TYPEmutex_type">mutex_type</a> -> <a href="Netmcore_mutex.html#TYPEmutex">mutex</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">create m t</code>: Creates a mutex of type <code class="code">t</code>, and
pushes it to the heap, using the mutator <code class="code">m</code>.</p>
<p>After being pushed to the heap, the mutex can be used. It is
nonsense to copy it outside the heap.</p>
</div>
</div>
<pre><span id="VALlock"><span class="keyword">val</span> lock</span> : <code class="type"><a href="Netmcore_mutex.html#TYPEmutex">mutex</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Locks the mutex</p>
</div>
</div>
<pre><span id="VALunlock"><span class="keyword">val</span> unlock</span> : <code class="type"><a href="Netmcore_mutex.html#TYPEmutex">mutex</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Unlocks the mutex</p>
</div>
</div>
<pre><span id="VALdestroy"><span class="keyword">val</span> destroy</span> : <code class="type"><a href="Netmcore_mutex.html#TYPEmutex">mutex</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Destroys the mutex</p>
</div>
</div>
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