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<h1>Module <a href="type_Lwt_mvar.html">Lwt_mvar</a></h1>
<pre><span class="keyword">module</span> Lwt_mvar: <code class="code"><span class="keyword">sig</span></code> <a href="Lwt_mvar.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info module top">
Mailbox variables<br>
</div>
<hr width="100%">
<br>
"Mailbox" variables implement a synchronising variable, used for
communication between concurrent threads.
<p>
This code adapted from
<a href="http://eigenclass.org/hiki.rb?cmd=view&p=lightweight-threads-with-lwt">Comparing lightweight threads (eigenclass.org)</a><br>
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type">'a</code> t</span> </pre>
<div class="info ">
The type of a mailbox variable. Mailbox variables are used to
communicate values between threads in a synchronous way. The
type parameter specifies the type of the value propagated from
<code class="code">put</code> to <code class="code">take</code>.<br>
</div>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">'a -> 'a <a href="Lwt_mvar.html#TYPEt">t</a></code></pre><div class="info ">
<code class="code">create v</code> creates a new mailbox variable containing value <code class="code">v</code>.<br>
</div>
<pre><span id="VALcreate_empty"><span class="keyword">val</span> create_empty</span> : <code class="type">unit -> 'a <a href="Lwt_mvar.html#TYPEt">t</a></code></pre><div class="info ">
<code class="code">create ()</code> creates a new empty mailbox variable.<br>
</div>
<pre><span id="VALput"><span class="keyword">val</span> put</span> : <code class="type">'a <a href="Lwt_mvar.html#TYPEt">t</a> -> 'a -> unit <a href="Lwt.html#TYPEt">Lwt.t</a></code></pre><div class="info ">
<code class="code">put mvar value</code> puts a value into a mailbox variable. This
value will remain in the mailbox until <code class="code">take</code> is called to
remove it. If the mailbox is not empty, the current thread will
block until it is emptied.<br>
</div>
<pre><span id="VALtake"><span class="keyword">val</span> take</span> : <code class="type">'a <a href="Lwt_mvar.html#TYPEt">t</a> -> 'a <a href="Lwt.html#TYPEt">Lwt.t</a></code></pre><div class="info ">
<code class="code">take mvar</code> will take any currently available value from the
mailbox variable. If no value is currently available, the
current thread will block, awaiting a value to be <code class="code">put</code> by
another thread.<br>
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