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<tr><th colspan="3" align="center">Chapter 1. ZendX_Console_Process_Unix</th></tr>
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<div class="chapter">
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<div class="titlepage"><div><div><h1 class="title">
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<a name="zendx.console.process.unix"></a>Chapter 1. ZendX_Console_Process_Unix</h1></div></div></div>
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<span style="color: red"><sect1>
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<span style="color: red"><title>ZendX_Console_Process_Unix</title></span>
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<span style="color: red"><sect2>
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<span style="color: red"><title>Introduction</title></span>
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<span style="color: red"><para>
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<span style="color: red"><classname>ZendX_Console_Process_Unix</classname></span> allows developers to spawn
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an object as a new process, and so do multiple tasks in parallel on
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console environments. Through its specific nature, it is only
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working on *nix based systems like Linux, Solaris, Mac/OSx and such.
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Additionally, the <span style="color: red"><code>shmop_*</code></span>, <span style="color: red"><code>pcntl_*</code></span> and
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<span style="color: red"><code>posix_*</code></span> modules are required for this component to
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run. If one of the requirements is not met, it will throw an
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exception after instantiating the component.
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</para></span>
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</sect2></span>
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<span style="color: red"><sect2>
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<span style="color: red"><title>Basic usage of ZendX_Console_Process_Unix</title></span>
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<span style="color: red"><para>
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<span style="color: red"><classname>ZendX_Console_Process_Unix</classname></span> is an abstract class, which
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requires the user to extend it. It has a single abstract method
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called <span style="color: red"><methodname>_run()</methodname></span> which has to be implemented to create a
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working process. It also comes with multiple methods for checking
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the alive status and share variables between the parent and the
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child process.
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</para></span>
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<span style="color: red"><para>
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The <span style="color: red"><methodname>_run()</methodname></span> method and every method which is called
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by it is executed by the child process. Every other method which is
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called directly by the parent is executed by the parent process.
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</para></span>
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<span style="color: red"><para>
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<span style="color: red"><methodname>setVariable()</methodname></span> and <span style="color: red"><methodname>getVariable()</methodname></span> can be
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used from both the parent- and the child process to share variables.
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To observe the alive status, the child process should call
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<span style="color: red"><methodname>_setAlive()</methodname></span> in a frequent interval, so that the parent
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process can check the last alive time via <span style="color: red"><methodname>getLastAlive()</methodname></span>.
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To get the PID of the child process, the parent can call
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<span style="color: red"><methodname>getPid()</methodname></span>.
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</para></span>
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<span style="color: red"><example>
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<span style="color: red"><title>Basic example for processing</title></span>
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<span style="color: red"><para>
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This example illustrates a basic child process
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</para></span>
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<span style="color: red"><programlisting>
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class MyProcess extends ZendX_Console_Process_Unix
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{
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protected function _run()
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{
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for ($i = 0; $i < 10; $i++) {
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// Doing something really important which can't wait: sleeping
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sleep(1);
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}
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}
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}
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// This part should last about 10 seconds, not 20.
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$process1 = new MyProcess();
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$process1->start();
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$process2 = new MyProcess();
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$process2->start();
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while ($process1->isRunning() || $process2->isRunning()) {
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sleep(1);
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}
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echo 'All processes completed';
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</programlisting></span>
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<span style="color: red"><para>
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In this example a process is forked twice and executed. As every
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process runs 10 seconds, the parent process will be finished after
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10 seconds (and not 20).
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</para></span>
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</example></span>
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