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<link title="CCHashtbl" rel="Chapter" href="CCHashtbl.html">
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<link title="CCRingBuffer" rel="Chapter" href="CCRingBuffer.html">
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<link title="CCMixset" rel="Chapter" href="CCMixset.html">
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<link title="CCHashconsedSet" rel="Chapter" href="CCHashconsedSet.html">
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<link title="CCGraph" rel="Chapter" href="CCGraph.html">
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<link title="CCHashSet" rel="Chapter" href="CCHashSet.html">
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<link title="CCBitField" rel="Chapter" href="CCBitField.html">
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<link title="CCHashTrie" rel="Chapter" href="CCHashTrie.html">
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<link title="CCWBTree" rel="Chapter" href="CCWBTree.html">
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<link title="CCAllocCache" rel="Chapter" href="CCAllocCache.html">
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<link title="CCLinq" rel="Chapter" href="CCLinq.html">
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<link title="CCSexpM" rel="Chapter" href="CCSexpM.html"><title>Containers doc : CCSemaphore</title>
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<h1>Module <a href="type_CCSemaphore.html">CCSemaphore</a></h1>
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<pre><span class="keyword">module</span> CCSemaphore: <code class="code"><span class="keyword">sig</span></code> <a href="CCSemaphore.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info module top">
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<h1 id="1_Semaphores">Semaphores</h1><br>
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<b>Since</b> 0.13<br>
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</div>
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<hr width="100%">
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<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
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<div class="info ">
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A semaphore<br>
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</div>
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<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -> <a href="CCSemaphore.html#TYPEt">t</a></code></pre><div class="info ">
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<code class="code">create n</code> creates a semaphore with initial value <code class="code">n</code><br>
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<b>Raises</b> <code>Invalid_argument</code> if <code class="code">n <= 0</code><br>
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</div>
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<pre><span id="VALget"><span class="keyword">val</span> get</span> : <code class="type"><a href="CCSemaphore.html#TYPEt">t</a> -> int</code></pre><div class="info ">
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Current value<br>
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</div>
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<pre><span id="VALacquire"><span class="keyword">val</span> acquire</span> : <code class="type">int -> <a href="CCSemaphore.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
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<code class="code">acquire n s</code> blocks until <code class="code">get s >= n</code>, then atomically
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sets <code class="code">s := !s - n</code><br>
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</div>
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<pre><span id="VALrelease"><span class="keyword">val</span> release</span> : <code class="type">int -> <a href="CCSemaphore.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
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<code class="code">release n s</code> atomically sets <code class="code">s := !s + n</code><br>
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</div>
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<pre><span id="VALwith_acquire"><span class="keyword">val</span> with_acquire</span> : <code class="type">n:int -> <a href="CCSemaphore.html#TYPEt">t</a> -> f:(unit -> 'a) -> 'a</code></pre><div class="info ">
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<code class="code">with_acquire ~n s ~f</code> first acquires <code class="code">s</code> with <code class="code">n</code> units,
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calls <code class="code">f ()</code>, and then release <code class="code">s</code> with <code class="code">n</code> units.
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Safely release the semaphore even if <code class="code">f ()</code> fails<br>
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</div>
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<pre><span id="VALwait_until_at_least"><span class="keyword">val</span> wait_until_at_least</span> : <code class="type">n:int -> <a href="CCSemaphore.html#TYPEt">t</a> -> f:(unit -> 'a) -> 'a</code></pre><div class="info ">
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<code class="code">wait_until_at_least ~n s ~f</code> waits until <code class="code">get s >= n</code>, then calls <code class="code">f ()</code>
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and returns its result. Doesn't modify the semaphore.<br>
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