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<link title="Ipv6" rel="Chapter" href="Ipv6.html"><title>Ocamlnet 3 Reference Manual : Netsys_pollset_generic</title>
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<center><h1>Module <a href="type_Netsys_pollset_generic.html">Netsys_pollset_generic</a></h1></center>
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<pre><span class="keyword">module</span> Netsys_pollset_generic: <code class="code">sig</code> <a href="Netsys_pollset_generic.html">..</a> <code class="code">end</code></pre>Returns a good standard implementation of pollset for this platform.
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It will be good for cases where only a small to medium number of
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descriptors is watched (several hundred should be ok). It is no problem
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when the pollset lives only for a short time. Also, it is not strictly
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necessary to call the <code class="code">dispose</code> method after use.
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On POSIX platforms, this returns a
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<a href="Netsys_pollset_posix.html#VALpoll_based_pollset"><code class="code">Netsys_pollset_posix.poll_based_pollset</code></a>.
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On Win32, this returns <a href="Netsys_pollset_win32.html#VALpollset"><code class="code">Netsys_pollset_win32.pollset</code></a> in single-threaded
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programs, and a <a href="Netsys_pollset_win32.html#VALthreaded_pollset"><code class="code">Netsys_pollset_win32.threaded_pollset</code></a> in
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multi-threaded programs. Note that Win32 restricts the number of
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descriptors that can be watched per thread to 64. The <code class="code">threaded_pollset</code>
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version overcomes this limit, but it is only available if your
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program is compiled for multi-threading. Because of this, it may be
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useful to enable multi-threading for your program even when your code
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does not make use of it otherwise.<br>
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<pre><span id="VALstandard_pollset"><span class="keyword">val</span> standard_pollset</span> : <code class="type">unit -> <a href="Netsys_pollset.pollset-c.html">Netsys_pollset.pollset</a></code></pre><div class="info">
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Returns a good standard implementation of pollset for this platform.
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It will be good for cases where only a small to medium number of
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descriptors is watched (several hundred should be ok). It is no problem
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when the pollset lives only for a short time. Also, it is not strictly
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necessary to call the <code class="code">dispose</code> method after use.
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On POSIX platforms, this returns a
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<a href="Netsys_pollset_posix.html#VALpoll_based_pollset"><code class="code">Netsys_pollset_posix.poll_based_pollset</code></a>.
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On Win32, this returns <a href="Netsys_pollset_win32.html#VALpollset"><code class="code">Netsys_pollset_win32.pollset</code></a> in single-threaded
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programs, and a <a href="Netsys_pollset_win32.html#VALthreaded_pollset"><code class="code">Netsys_pollset_win32.threaded_pollset</code></a> in
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multi-threaded programs. Note that Win32 restricts the number of
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descriptors that can be watched per thread to 64. The <code class="code">threaded_pollset</code>
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version overcomes this limit, but it is only available if your
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program is compiled for multi-threading. Because of this, it may be
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useful to enable multi-threading for your program even when your code
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does not make use of it otherwise.<br>
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<pre><span id="VALperformance_pollset"><span class="keyword">val</span> performance_pollset</span> : <code class="type">unit -> <a href="Netsys_pollset.pollset-c.html">Netsys_pollset.pollset</a></code></pre><div class="info">
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Returns the best available pollset on this platform for high performance
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servers that have to deal with many different file descriptors. Note
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that this pollset may have higher initial costs, and may not be
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suitable for cases where pollsets live only for a short time. Also,
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make sure the <code class="code">dispose</code> method is called after use.
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Currently, this is the same as <code class="code">standard_pollset</code>, because no better
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implementations exist. In the future, <code class="code">performance_pollset</code> will use
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kernel-based polling on some OS ("epoll", "kqueue", "/dev/poll", etc.)<br>
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<pre><span id="VALselect_emulation"><span class="keyword">val</span> select_emulation</span> : <code class="type"><a href="Netsys_pollset.pollset-c.html">Netsys_pollset.pollset</a> -><br> Unix.file_descr list -><br> Unix.file_descr list -><br> Unix.file_descr list -><br> float -> Unix.file_descr list * Unix.file_descr list * Unix.file_descr list</code></pre><div class="info">
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<code class="code">let select = select_emulation pset</code>: Returns a function with the
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same meaning as <code class="code">Unix.select</code>. It is emulated on top of <code class="code">pset</code>.
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Using the function is only recommended when the lists of file
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descriptors are short. Long lists impose a big performance penalty.
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Unlike <code class="code">Unix.select</code> the descriptors may be returned in any order.<br>
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