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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Shell_uq.system_handler_engine</title>
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<center><h1>Class <a href="type_Shell_uq.system_handler_engine.html">Shell_uq.system_handler_engine</a></h1></center>
<br>
<pre><span class="keyword">class</span> <a name="TYPEsystem_handler_engine"></a>system_handler_engine : <code class="type"><a href="Unixqueue.event_system.html">Unixqueue.event_system</a> -> </code><code class="type">[unit]</code> <code class="type"><a href="Shell_uq.system_handler_engine_type.html">system_handler_engine_type</a></code></pre>This engine implements a <a href="Shell_sys.html#TYPEsystem_handler"><code class="code">Shell_sys.system_handler</code></a>, and can
be used to watch an already started <code class="code">job_instance</code> as created by
<a href="Shell_sys.html#VALrun_job"><code class="code">Shell_sys.run_job</code></a> until the job is done. It is necessary to
<a href="Shell_sys.html#VALregister_job"><code class="code">Shell_sys.register_job</code></a> at the system handler.
<p>
When the job terminates the status of the engine changes to
<code class="code">`Done ()</code>. The status of the engine does not reflect whether
the job was successful <code class="code">Job_ok</code> or has failed <code class="code">Job_error</code>.
<p>
The engine status <code class="code">`Error</code> indicates an internal error. It
is also used when callback functions raise exceptions.
<p>
When the engine goes to <code class="code">`Error</code> or <code class="code">`Aborted</code>, the job
is terminated ( <a href="Shell_sys.html#VALabandon_job"><code class="code">Shell_sys.abandon_job</code></a> ).<br>
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