Implementing multi-threading in php_PHP tutorial

PHP implements multi-threading
It is much more convenient for the server to send multiple requests to implement multi-process. Can only be used in cli mode. Can be used in special occasions, such as email sending tasks, etc.
The shared access to resources uses file locks, which is not very reliable. It is mainly for use under Windows. If it is really necessary, you can consider using the corresponding semaphore mechanism yourself (this extension can only be used for xUNIX).

Example
[php]
define('DIR_PHP_EXEC', 'php');
define('DIR_MAIN_EXEC', __FILE__);
define('DIR_TMP', '/ tmp');
require_once('my_process.php');

class pp extends my_process_base {
public function run($param = null) {
for ($i = 0; $i < 4; $i++) {
                                                                                     
$obj = $GLOBALS['gal_obj_process_m'];
if ($obj->is_main()) {
$obj->run_task('pp', 'a');
$obj->run_task('pp', 'b');

$obj->run_task('pp', 'd');
//$obj->run_task('pp', 'b');
$obj->set_max_run(10);
$obj->run() ;
}

[/php]

Process Management Class
[php]
/**

* @author  徐智 

* $Id: getPage.php 11 2007-09-21 02:15:01Z fred $
*/
if (!defined(' DIR_PHP_EXEC')) define('DIR_PHP_EXEC', 'php');
//if (!defined('DIR_MAIN_EXEC')) define('DIR_MAIN_EXEC', '');
if (!defined('DIR_TMP ')) define('DIR_TMP', '');
/*****************************************************************************/
/* Initialization*/
define('CMD_MAIN_PROCESS_KEY', 'main_process_key');
define ('CMD_CHILD_PROCESS_NAME', 'child_process_name');
define('CMD_CHILD_PROCESS_PARAM', 'child_process_param');

function init_my_process() {
$GLOBALS['gal_obj_cmd'] = new my_cmd_argv() ;
$key = $GLOBALS['gal_obj_cmd']->get_value(CMD_MAIN_PROCESS_KEY);
$key = $key === false ? '' : $key;
$GLOBALS['gal_obj_process_m' ] = new my_process_m($key);

}

/**
* php multi-process class
*
* You need to inherit from this object and then implement your own run processing
*/

public function __construct($auto_run=true, $name='') {
}

public function __destruct () {
echo "@endn";
}

abstract public function run($param = null);

class my_cmd_argv {

public function __construct() {
$argv = $_SERVER['argv'];

                                                                                                       ]) ? $cmd[1] : '';
}
}

public function get_key($key) {
return isset($this->cmd_argv[$key] );
}

public function get_value($key) {
return isset($this->cmd_argv[$key]) ? $this->cmd_argv[$key] : false ; }

}

/**

* Multi-process processing can be implemented in PHP and can only be used in console mode
* The current signal implementation mechanism uses file mode
*
*/

/**
* @var array $task_list
* Process list
*/
private $task_list = array() ;
private $lock_list = array();
private $lock = null;
private $is_main = false;
private $max_run = 3600000;

    private function release_lock($key = null) {
        $lock = &$this->lock_list;
        if (!is_null($key)) {
            $key = md5($this->build_lock_id($key));
            if (isset($lock[$key])) {
                if (is_resource($lock[$key][0])) fclose($lock[$key][0]);
                unlink($lock[$key][1]);
                unset($lock[$key]);
            }
            return true;
        }

        foreach ($lock as $k => $h) {
            if (is_resource($h)) fclose($h);
            unset($lock[$k]);
        }
        return true;
    }

    private function release_task($key = null) {
        $task = &$this->task_list;
        if (!is_null($key) && isset($task[$key])) {
            if (is_resource($task[$key])) pclose($task[$key]);
            unset($task[$key]);
        } else {
            foreach ($task as $k => $h) {
                if (is_resource($h)) pclose($h);
                unset($task[$k]);
            }
        }
        return true;
    }
           
    private function build_lock_id($key) {
        return DIR_TMP . DIRECTORY_SEPARATOR . $key . '_sem.lock';
    }

    protected function run_child_process() {
        $class = $GLOBALS['gal_obj_cmd']->get_value(CMD_CHILD_PROCESS_NAME);
        $param = $GLOBALS['gal_obj_cmd']->get_value(CMD_CHILD_PROCESS_PARAM);
        $param = $param == '' ? null : unserialize(base64_decode(trim($param)));
        $obj = new $class();
        $obj->run($param);
        $this->task_list[] = $obj;
    }

    public function __construct($lock='') {
        if ($lock === '') {
            $this->is_main = true;
            $key = md5(uniqid()) . '_main.my_process';
            $lock = array($key, $this->get($key));
        } else {
            $this->is_main = false;
            $lock = array($lock, 0);
        }
        $this->lock = $lock;
    }

    public function __destruct() {
        $this->release_lock();
        $this->release_task();
    }

    /**
* Stop all processes
*
*/
    public function stop_all() {
    }

    /**
* Whether it is the main process
*
*/
    public function is_main() {
        return $this->is_main;
    }

    /**
* Is there already an active signal
*
* @param string $key
* @return bool
*/
    public function exist($key) {
        return file_exists($this->build_lock_id($key));
    }

    /**
* Get a signal
*
* @param string $key
* @param int $max_acquire The maximum number of blocked requests
* @return mix If successful, return a signal ID
*
*/
    public function get($key, $max_acquire=5) {
        $fn = $this->build_lock_id($key);
        if (isset($this->lock_list[md5($fn)])) return false;
        $id = fopen($fn, 'a+');
        if ($id) $this->lock_list[md5($fn)] = array($id, $fn);
        return $id;
    }

    /**
* Release a signal
*
* @param string $key
* @return bool If successful, return a signal true
*
*/
    public function remove($key) {
        return $this->release_lock($key);
    }

    /**
* Get a signal
*
* @param string $id Signal ID
* @param bool $block Whether to block
*/
    public function acquire($id, $block=false) {
        if ($block) {
            return flock($id, LOCK_EX);
        } else {
            return flock($id, LOCK_EX + LOCK_NB);
        }
    }

    /**
* Release a signal
*
*/
    public function release($id) {
        flock($id, LOCK_UN);
    }
    public function run_task($process_name, $param=null) {
        $this->task_list[] = popen(DIR_PHP_EXEC . ' -f ' . DIR_MAIN_EXEC . ' -- '
            . CMD_CHILD_PROCESS_NAME . '=' . $process_name . ' '
            . CMD_CHILD_PROCESS_PARAM . '="' . base64_encode(serialize($param)) . '" '
            . CMD_MAIN_PROCESS_KEY . '="' . $this->lock[0] . '" ',
            'r');
    }

    public function run($auto_run = true) {
        if ($this->is_main) {
            $ps = &$this->task_list;
            $max_run = &$this->max_run;
            $id = 0;
            do {
                //echo "process----------------------------------------: n";
                $c = 0;
                foreach ($ps as $k => $h) {
                    $c++;
                    $msg = fread($h, 8000);
                    if (substr($msg, -5, 4) === '@end') {
                        echo "end process:[$k][$id] echo n{$msg} n";
                        $this->release_task($k);
                    } else {
                        echo "process:[$k][$id] echo n{$msg} n";
                    }
                }
                sleep(1);
            } while ($auto_run && $id++ < $max_run && $c > 0);
        } else {
            $this->run_child_process();
        }
    }

    public function set_max_run($max=1000) {
        $this->max_run = $max;
    }
}