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<title>Ocamlnet 4 Reference Manual : Netsys_polypipe</title>
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<h1>Module <a href="type_Netsys_polypipe.html">Netsys_polypipe</a></h1>
<pre><span id="MODULENetsys_polypipe"><span class="keyword">module</span> Netsys_polypipe</span>: <code class="code">sig</code> <a href="Netsys_polypipe.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Polymorphic message pipes</p>
</div>
</div>
<hr width="100%">
<p>These pipes are restricted to a single process, and can be used
to send messages of any types between threads.</p>
<pre><span id="EXCEPTIONClosed"><span class="keyword">exception</span> Closed</span></pre>
<pre><span id="TYPEpolypipe"><span class="keyword">type</span> <code class="type">'a</code> polypipe</span> </pre>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -> 'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> * 'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a></code></pre><div class="info ">
<div class="info-desc">
<p>Create a new polypipe with an internal buffer of n messages. The left
descriptor is open for reading, and the right is open for writing.</p>
</div>
</div>
<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>return the number of messages in the buffer</p>
</div>
</div>
<pre><span id="VALeof"><span class="keyword">val</span> eof</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> bool</code></pre><div class="info ">
<div class="info-desc">
<p>whether the eof marker was sent. Note that there may still be messages
in the buffer</p>
</div>
</div>
<pre><span id="VALread"><span class="keyword">val</span> read</span> : <code class="type">nonblock:bool -> 'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> 'a option</code></pre><div class="info ">
<div class="info-desc">
<p>read a message. <code class="code">None</code> means EOF. Possible <code class="code">Unix.unix_error</code> codes:</p>
<ul>
<li><code class="code">EAGAIN</code>: the pipe is non-blocking, and there is no message in the
buffer</li>
<li><code class="code">EINTR</code>: a signal arrived</li>
</ul>
<p>Raises <code class="code">Closed</code> if the polypipe has been closed.</p>
</div>
</div>
<pre><span id="VALwrite"><span class="keyword">val</span> write</span> : <code class="type">nonblock:bool -> 'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> 'a option -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>write a message, or mark the end of the stream (<code class="code">None</code>).
Possible <code class="code">Unix.unix_error</code> codes:</p>
<ul>
<li><code class="code">EAGAIN</code>: the pipe is non-blocking, and there is no message in the
buffer</li>
<li><code class="code">EINTR</code>: a signal arrived</li>
<li><code class="code">EPIPE</code>: it was tried to send a message after sending <code class="code">None</code>.</li>
</ul>
<p>Unlike OS pipes, polypipes become writable after signaling EOF.</p>
<p>Raises <code class="code">Closed</code> if the polypipe has been closed.</p>
</div>
</div>
<pre><span id="VALclose"><span class="keyword">val</span> close</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Close the pipe. Writing will be immediately impossible. Reading
will return <code class="code">None</code>.</p>
</div>
</div>
<pre><span id="VALset_read_notify"><span class="keyword">val</span> set_read_notify</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> (unit -> unit) -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">set_read_notify pipe f</code>: Sets that the function <code class="code">f</code> is called
when the pipe becomes readable (or reaches eof). Only one such
function can be registered; any previous function is
overwritten. The function will be called from a different thread.</p>
</div>
</div>
<pre><span id="VALset_write_notify"><span class="keyword">val</span> set_write_notify</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> (unit -> unit) -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">set_write_notify pipe f</code>: Sets that the function <code class="code">f</code> is called
when the pipe becomes writable (or reaches eof). Only one such
function can be registered; any previous function is
overwritten. The function will be called from a different thread.</p>
</div>
</div>
<pre><span id="VALread_descr"><span class="keyword">val</span> read_descr</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> Unix.file_descr</code></pre><div class="info ">
<div class="info-desc">
<p>Returns a descriptor that can be used for polling. When the descriptor
is readable there is a message in the buffer. If called several times,
always the same descriptor is returned.</p>
<p>The caller has to close the descriptor after use.</p>
<p>Raises <code class="code">Closed</code> if the polypipe has been closed.</p>
</div>
</div>
<pre><span id="VALwrite_descr"><span class="keyword">val</span> write_descr</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> Unix.file_descr</code></pre><div class="info ">
<div class="info-desc">
<p>Returns a descriptor that can be used for polling. When the descriptor
is readable (sic) there is space in the buffer for another message.
If called several times, always the same descriptor is returned.</p>
<p>The caller has to close the descriptor after use.</p>
<p>Raises <code class="code">Closed</code> if the polypipe has been closed.</p>
</div>
</div>
<pre><span id="VALset_exception"><span class="keyword">val</span> set_exception</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> exn -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets an exception that is returned by further calls of
<code class="code">write</code>. If an exception already exists, it is not overwritten.</p>
<p><code class="code">read</code> will return EOF. Readers need to test for the exceptionw with
<code class="code">get_exception</code>.</p>
</div>
</div>
<pre><span id="VALget_exception"><span class="keyword">val</span> get_exception</span> : <code class="type">'a <a href="Netsys_polypipe.html#TYPEpolypipe">polypipe</a> -> exn option</code></pre><div class="info ">
<div class="info-desc">
<p>Get the exception</p>
</div>
</div>
<h2 id="1_Debugging">Debugging</h2>
<pre><span id="MODULEDebug"><span class="keyword">module</span> <a href="Netsys_polypipe.Debug.html">Debug</a></span>: <code class="code">sig</code> <a href="Netsys_polypipe.Debug.html">..</a> <code class="code">end</code></pre></body></html>
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