<?php
/**
* PHP_Fork class usage examples
* ==================================================================================
* NOTE: In real world you surely want to keep each class into
* a separate file, then include() it into your application.
* For this examples is more useful to keep all_code_into_one_file,
* so that each example shows a unique feature of the PHP_Fork framework.
* ==================================================================================
* passing_vars.php
*
* This example shows variable exchange between the parent process
* and started pseudo-threads. This was not possible in previous releases because
* parent and child processes lives into different memory spaces,
* they are separate processes with their own PID and not separate instances living
* into the same JVM; this is just forking, not real threading...
* This framework offers a workaround based Shared Memory usage.
*
* ==================================================================================
*
* Copyright (c) 2003-2002 by Luca Mariano ([email protected])
* http://www.lucamariano.it
*
* This program is free software. You can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*/
// Import of base class
require_once ("../Fork.php");
// number of executeThreads we want
define ("NUM_THREAD", 2);
// Class definition; as into previos example (basic.php), this class simply
// increment a counter each second; instead of printing the value to stdout,
// we'll store it into an accessible location for latter use.
class executeThread extends PHP_Fork {
var $counter;
function executeThread($name)
{
$this->PHP_Fork($name);
$this->counter = 0;
}
function run()
{
while (true) {
// setVariable is a method inherited from PHP_Fork super class
// it sets a variable that can be accessed thru its name
// by parent process (calling the getVariable() method)
$this->setVariable('counter', $this->counter++);
sleep(1);
}
}
function getCounter()
{
// parent process can call this facility method
// in order to get back the actual value of the counter
return $this->getVariable('counter');
}
}
// Main program. Bring up NUM_THREAD instances of the executeThread class that
// runs concurrently. It's a multi-thread app with a few lines of code!!!
// Into this example we have a console to control thread behaviour and test
// their counter value.
for ($i = 0;$i < NUM_THREAD;$i++) {
$executeThread[$i] = new executeThread ("executeThread-" . $i);
$executeThread[$i]->start();
echo "Started " . $executeThread[$i]->getName() . " with PID " . $executeThread[$i]->getPid() . "...\n";
}
echo "This is the main process.\nPress [X] to terminate, [G] to read pseudo-thread's counter.\n";
// Console simple listener
while (true) {
echo ">";
$opt = _getInputCLI();
echo "\n";
switch ($opt) {
case "X":
// stops all threads
for ($i = 0;$i < NUM_THREAD;$i++) {
$executeThread[$i]->stop();
echo "Stopped " . $executeThread[$i]->getName() . "\n";
}
exit;
break;
case "G":
for ($i = 0;$i < NUM_THREAD;$i++) {
echo $executeThread[$i]->getName() . " returns " . $executeThread[$i]->getCounter() . "\n";
}
break;
}
}
// Functions used by the console
function _getInputCLI()
{
$opt = _read();
$opt = strtoupper (trim($opt));
return $opt;
}
function _read()
{
$fp = fopen("php://stdin", "r");
$input = fgets($fp, 255);
fclose($fp);
return $input;
}
?>
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